阪口 龍彦 (サカグチ タツヒコ)

  • 工学部 情報学科 准教授
Last Updated :2024/02/02

コミュニケーション情報 byコメンテータガイド

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    「ものづくり」における、モノの流れの最適化や生産の自動化のための支援技術を研究しています。特に生産計画や配送計画などの課題を解決するために、最適化法やシミュレーションなどの研究に取り組んでいます。

研究者情報

学位

  • 博士(工学)(大阪府立大学)
  • 修士(工学)(大阪府立大学)

ホームページURL

J-Global ID

研究キーワード

  • 生産システム   最適化   スケジューリング   生産管理   生産システム工学   Manufacturing Execution System   サプライチェーンマネジメント   Production Scheduling   

現在の研究分野(キーワード)

    「ものづくり」における、モノの流れの最適化や生産の自動化のための支援技術を研究しています。特に生産計画や配送計画などの課題を解決するために、最適化法やシミュレーションなどの研究に取り組んでいます。

研究分野

  • 社会基盤(土木・建築・防災) / 安全工学
  • 社会基盤(土木・建築・防災) / 社会システム工学
  • 情報通信 / 機械力学、メカトロニクス
  • 情報通信 / ロボティクス、知能機械システム
  • ものづくり技術(機械・電気電子・化学工学) / 加工学、生産工学

経歴

  • 2020年04月 - 現在  近畿大学工学部 情報学科准教授
  • 2020年04月 - 2021年03月  豊橋技術科学大学大学院工学研究科 機械工学系客員准教授
  • 2017年01月 - 2020年03月  豊橋技術科学大学 機械工学系 准教授
  • 2010年04月 - 2016年12月  豊橋技術科学大学 機械工学系 助教
  • 2009年04月 - 2010年03月  豊橋技術科学大学 生産システム工学系 助教
  • 2007年04月 - 2009年03月  神戸大学自然科学系先端融合研究環助教
  • 2005年01月 - 2007年03月  神戸大学大学院自然科学研究科助手

学歴

  • 2002年04月 - 2004年12月   大阪府立大学   大学院工学研究科   機械系専攻博士後期課程
  • 2000年04月 - 2002年03月   大阪府立大学   大学院工学研究科   機械系専攻博士前期課程
  • 1996年04月 - 2000年03月   大阪府立大学   工学部   機械システム工学科

所属学協会

  • スケジューリング学会   システム制御情報学会   精密工学会   日本機械学会   

研究活動情報

論文

  • KAOUD Essam; A. M. ABDEL-AAL Mohammad; SAKAGUCHI Tatsuhiko; UCHIYAMA Naoki
    Journal of Advanced Mechanical Design, Systems, and Manufacturing 16 4 JAMDSM0038 - JAMDSM0038 2022年10月 [査読有り]
     
    Most real-life optimization problems are subjected to uncertainty, and the robust optimization approach is one of the efficient techniques to deal with uncertain optimization problems. Supply chain optimization problems are highly sensitive to data perturbations mostly due to inappropriate estimation of the problems’ parameters and the highly dynamic environment. In this study, we propose an adaptable robust optimization model for the dual-channel closed-loop supply chain (CLSC) and present two counterpart models; the first model is a mixed integer linear programming (MILP) model based on the adjustable box uncertainty set, while the second robust model is a mixed integer nonlinear programming (MINLP) model based on the adjustable ellipsoidal uncertainty set. We provide a novel approach for considering multiple uncertainty sets in the objective function, that provide flexibility and control risk based on the preferences of the decision-makers. This study aims at minimizing the total cost of the dual-channel CLSC network considering uncertain purchasing, transportation, fixed, and processes costs, in addition to uncertain customer demand. Intensive computational experiments are conducted on the two robust models using GAMS software. Robust solutions are obtained and sensitivity analysis is conducted on both models considering 10% perturbation of the uncertain parameters around their nominal values as well as probability guarantee for not violating the constraints.
  • Essam Kaoud; Mohammad A. M. Abdel-Aal; Tatsuhiko Sakaguchi; Naoki Uchiyama
    Sustainability 14 16 10281 - 10281 2022年08月 [査読有り]
     
    In this study, we propose a robust bi-objective optimization model of the green closed-loop supply chain network considering presorting, a heterogeneous transportation system, and carbon emissions. The proposed model is an uncertain bi-objective mixed-integer linear optimization model that maximizes profit and minimizes carbon emissions by considering uncertain costs, selling price, and carbon emissions. The robust optimization approach is implemented using the combined interval and polyhedral, “Interval+ Polyhedral,” uncertainty set to develop the robust counterpart of the proposed model. Robust Pareto optimal solutions are obtained using a lexicographic weighted Tchebycheff optimization approach of the bi-objective model. Intensive computational experiments are conducted and a robust Pareto optimal front is obtained with a probability guarantee that the constraints containing uncertain parameters are not violated (constraint satisfaction).
  • Robust optimization for a dual-channel closed-loop supply chain with cost and demand uncertainty
    Essam Kaoud; Mohammad A. M. Abdel-Aal; Tatsuhiko Sakaguchi; Naoki Uchiyama
    Proc. of International Symposium on Scheduling 2021 10 - 15 2021年06月 [査読有り]
  • Essam Kaoud; Mohammad A. M. Abdel-Aal; Tatsuhiko Sakaguchi; Naoki Uchiyama
    Sustainability 12 23 10117 - 10117 2020年12月 [査読有り]
     
    The depletion of natural resources and the degradation of the ecosystem have led many countries to adopt closed-loop supply activities in both their industrial and service sectors. With the widespread use of Internet technology, these aspects motivate the incorporation of e-commerce with the classical closed-loop supply chain. This study suggests a novel mixed-integer linear programming (MILP) model that addresses the integration of e-commerce with a multi-echelon closed-loop supply chain with a multi-period planning time horizon by considering dual channels in manufacturing, and recovery facilities. To validate the model, we obtain optimal decision variables and examine the robustness and applicability of the model, and comprehensive computational experiments are performed. Moreover, sensitivity analysis is carried out to illustrate the efficacy of e-commerce integration by considering the two channels in the closed-loop supply chain. Accordingly, the total cost of the dual-channel CLSC decreases with an increase in customer demand via online retailers, the returned end of life (EOL) products, recycling ratio, and recovery ratio. Some useful managerial implications are provided based on the conducted analysis.
  • Tatsuhiko Sakaguchi; Ryo Ishii; Miyori Shirasuna; Naoki Uchiyama
    Transactions of the Institute of Systems, Control and Information Engineers 33 2 39 - 48 2020年02月 [査読有り]
  • Hiroya Uematsu; Tatsuhiko Sakaguchi; Naoki Uchiyama; Daichi Hiramatsu; Kensuke Hiramatsu
    2020 International Symposium on Flexible Automation, ISFA 2020 2020年 [査読有り]
     
    The production system of the food factory is basically a make-to-stock production. Therefore, to achieve efficient production, the integration of demand, production, and stock information is essential. In this paper, we propose a production planning method based on the demand prediction in order to decrease the stock in the factory of Japanese traditional food 'Tsukudani'. In the proposed method, the demand is first predicted according to the shipment records, then the material requirement planning and the capacity requirement planning are done based on the demand prediction. Finally, we carry out numerical experiments to validate the effectiveness of the proposed method.
  • Yuto Arai; Takahiro Sakuraba; Shigenori Sano; Tatsuhiko Sakaguchi; Naoki Uchiyama
    2019 IEEE/SICE INTERNATIONAL SYMPOSIUM ON SYSTEM INTEGRATION (SII) 729 - 733 2019年 [査読有り]
     
    Energy regenerative systems consisting of a combustion engine and an electric motor are widely used mainly for automobiles. However it is difficult to apply this type of hybrid system to personal mobilities and industrial machines in a factory, and thus the authors have developed a new type of regenerative brake systems. This study proposes a regenerative brake system using a spiral spring and magnetic gears or planetary gears instead of using an electric motor and a battery. Experimental results demonstrate the characteristic and effectiveness of the proposed systems, in which the regenerative ratio of approximately 30% with magnetic gears and 47% with planetary gears is confirmed.
  • Takahiro Sakuraba; Naoki Uchiyama; Shigenori Sano; Tatsuhiko Sakaguchi
    International Review of Automatic Control 12 1 31 - 41 2019年 [査読有り]
     
    © 2019 Praise Worthy Prize S.r.l. - All rights reserved. Since global environmental and energy resource exhaustion problems are becoming more serious, hybrid vehicles equipped with a regenerative system composed of an electric motor and a battery are attracting attention. However, the application of this type of system to personal mobility or industrial machines is difficult due to their smaller mass compared to vehicle systems; in order to mitigate this, authors have developed a new type of regenerative system using a spiral spring. This paper proposes a robust speed controller design using a disturbance observer in order to achieve the desired motion for industrial applications, and to analyze the regenerative efficiency of the proposed system. Experimental results show that the proposed system can provide energy saving of approximately 39% and it can improve the ability to follow the target velocity trajectory. Copyright © 2019 Praise Worthy Prize - All rights reserved.
  • Masaki Oda; Naoki Uchiyama; Tatsuhiko Sakaguchi
    Proceedings - 2018 IEEE International Conference on Industrial Electronics for Sustainable Energy Systems, IESES 2018 2018-January 479 - 483 2018年04月 [査読有り]
     
    © 2018 IEEE. Although adaptive control has been widely studied and its effectiveness in control performance has been confirmed in scientific papers, applications to industrial machines are not widespread. This study verifies its effectiveness to not only motion trajectory tracking performance but also energy consumption with an industrial machine testbed. Because adaptive control adjusts its control parameters to ideal values, less energy consumption is expected while maintaining control performance. First, this paper presents a design of discrete-time adaptive control based on one of the authors' previous work. Next, contouring performance and energy consumption are compared to a conventional controller including proportional-derivative control and a robust observer. A typical repetitive circular motion of a machine tool feed drive with/without cutting tasks is employed for experimental comparison under several control system poles.
  • Tatsuhiko Sakaguchi; Kohki Matsumoto; Naoki Uchiyama
    IJAT 12 5 730 - 738 2018年 [査読有り]
     
    In sheet metal processing, nesting and scheduling are important factors affecting the efficiency and agility of manufacturing. The objective of nesting is to minimize the waste of material, while that of scheduling is to optimize the processing sequence. As the relation between them often becomes a trade-off, they should be considered simultaneously for the efficiency of the total manufacturing process. In this study, we propose a co-evolutionary genetic algorithm-based nesting scheduling method. We first define a cost function as a fitness value, and then we propose a grouping method that forms gene groups based on the processing layout and processing time. Finally, we validate the effectiveness of the proposed method through computational experiments.
  • 白砂 絹和; 章 忠; 戸田 浩; 石川 康宏; 阪口 龍彦; 秋月 拓磨
    日本機械学会論文集 84 868 2018年 [査読有り]
     
    <p>This paper presents a discrimination method of Sleep Apnea Syndrome (SAS) and early detection of potential Sleep Apnea Syndrome (Pre-SAS) using sleep breath sound, by which each subject can take the required data for the diagnosis at home only with a voice recorder. Sleep breath sound of around two hours is analyzed statistically for detecting SAS patients. Long silence sections in the sleep breath sound and the biggest sound pressure typically occurred after them are compared for distinguishing Pre-SAS, SAS patients and non-patients. The k-means method is applied for classifying the above sound data. The proposed method drastically reduces the time and effort required for SAS diagnosis compared to the current medical approaches. Experimental results show the effectiveness of the proposed method, by which 100 % accuracy of discrimination is achieved.</p>
  • Tatsuhiko Sakaguchi; Kohki Matsumoto; Naoki Uchiyama
    Proceedings of the 9th International Conference on Leading Edge Manufacturing in 21st Century, LEM 2017 2017年11月 [査読有り]
     
    In the sheet metal processing, nesting and scheduling are the important factors for the efficient and agile manufacturing. The objective of nesting is minimizing the waste of material, while that of scheduling is optimizing the operational sequence. The relation between them often becomes trade-off. Therefore, they should be considered simultaneously for the efficiency of entire manufacturing. In this study, we propose a Coevolutionary Genetic Algorithm based nesting scheduling method. First, we define a cost function as a fitness value. Then we propose a grouping method that forms groups of gene based on the cutting layout and the processing time. Finally, we validate the effectiveness of the proposed method through computational experiments.
  • Takahiro Sakuraba; Naoki Uchiyama; Shigenori Sano; Tatsuhiko Sakaguchi
    JOURNAL OF ADVANCED COMPUTATIONAL INTELLIGENCE AND INTELLIGENT INFORMATICS 21 4 751 - 759 2017年07月 [査読有り]
     
    In human-operated mechanical systems such as automobiles, electric bicycles, and electric wheelchairs, energy saving is an important criterion. Hybrid systems consisting of combustion engines and electricmotors have found successful applications in automobiles. However, it is difficult to apply this type of hybrid system to personal mobilities and industrial machines in a factory, as there is a requirement to reduce their energy consumption owing to recent environmental and energy resource problems. Therefore, a previous study has focused on the use of a mechanical spring as a regenerative brake in a hybrid bicycle. This study, however, presents a new type of hybrid system that includes the use of a mechanical spring. An experimental wheeled mobile system is designed, and its effectiveness is confirmed through comparative experiments in which a reduction of more than 30% in the consumed energy is achieved in acceleration periods as compared to a conventional system.
  • 阪口龍彦; 田中達也; 清水良明; 内山直樹
    日本機械学会論文集(Web) 83 848 ROMBUNNO.16‐00333(J‐STAGE) - 234 一般社団法人 日本機械学会 2017年 [査読有り]
     

    In recent years, manufacturing industries are required to provide various kinds of products in a short time while reducing burden on the environment. To achieve such requirement, optimization techniques incorporated with ICT are attracting a rising attention. In sheet metal processing, reducing wastes of material and managing production schedule are considered to be very important for the efficient manufacturing. To work with these problems, we attempt to simultaneously minimize wastes of material and total tardiness through nesting and scheduling. The nesting and scheduling in sheet metal processing are affected with each other and there occurs certain conflicts in their decisions. For entire efficiency of manufacturing activities, therefore, they should be decided through managing trade-off between them. Under such understanding, in our previous study, we proposed an integrated method of nesting and scheduling. This method determines a schedule under the condition that the operational sequence of punching process as the first process of sheet metal processing is fixed. In order to realize more efficient manufacturing, in this paper, we have included the punching process in our consideration. Then, this study has proposed a hybrid heuristic approach to the scheduling problem of sheet metal processing. Genetic algorithm, dispatching rule and local search technique are applied to create a schedule together with a bottom left algorithm for nesting. Finally, in order to validate the effectiveness of the proposed method, we implemented prototype of nesting scheduling system and carried out a few computational experiments.

  • Tatsuhiko Sakaguchi; Tatsuya Tanaka; Yoshiaki Shimizu; Naoki Uchiyama
    2016 INTERNATIONAL SYMPOSIUM ON FLEXIBLE AUTOMATION (ISFA) 198 - 201 2016年 [査読有り]
     
    In the sheet metal processing, nesting and scheduling are important design and operational tasks, respectively. The optimal cutting layout is determined by nesting for reducing waste of material while the optimal sequence is determined by scheduling for increasing efficiency of operational activities. Since we often encounter trade-offs regarding to their decision-making, they should be considered simultaneously. Accordingly, we previously proposed an integrated method of nesting and scheduling under a certain system boundary. In order to realize more efficient manufacturing, the punching process, which is the first process of sheet metal processing, should be considered. To work with this problem, in this study, we have extended our previous method by applying genetic algorithm for the optimization of sequence of punching process which depends on the cutting layout. Numerical experiment is provided to validate the effectiveness of the proposed method.
  • Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Jae-Kyu Yoo
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 10 1 2016年 [査読有り]
     
    Under growing concerns with sustainability in global and changing market, establishing a cooperative and competitive logistic is becoming a keen issue to provide manufacturing systems amenable to sales and operations planning. As a deployment for such practice, we have engaged in the various studies on logistics optimization. Especially, noticing that transportation cost and/or CO2 emission actually depend not only on distance but also loading weight (Weber basis), we have recently developed a few hybrid meta-heuristic methods for vehicle routing problems (VRP) and shown their effectiveness through numerical experiments. To the best of our knowledge, however, there exist no studies that take the Weber basis into account on VRP except for ours. As a hot interest in this area, we pay our attention on VRP with simultaneous pickup and delivery (VRPSPD). Then, this study attempts to extend the foregoing Weber basis study under single depot to multi-depot problem and intends to reveal some properties of VRPSPD. To work with such concerns, we have developed a novel hierarchical method comprised of a modified tabu search, a graph algorithm for the minimum cost flow problem and a Weber basis saving method. The proposed method is possible to solve various real world applications practically even with large problem sizes. Finally, the effectiveness of the proposed method is validated through numerical experiments taken place from various viewpoints to discuss about some peculiar features of VRPSPD.
  • 清水良明; YOO Jae‐Kyu; 阪口龍彦
    進化計算学会論文誌(Web) 7 1 11 - 11 進化計算学会 2016年 [査読有り]
     
    Since many/multi-objective optimization can support adaptive and flexible decision-making under complex and global decision environment, keen interests have been recently paid on this topic more and more. As a variant of such issues, various concerns have been turned to the studies associated with many/multi-objective evolutionary algorithm. We can view this kind of researches as an objective task referring to multi-objective analysis (MOA) termed traditionally. On the other hand, many/multi-objective optimization (MOP) needs some subjective judgment on preference of decision maker to work with the problem. Besides uncertainties of the employed model including the value system, therefore, we must take care of the ambiguity imbedded in the subjectivity as a generic problem. To cope with such situation, this study has proposed a novel idea for making post-optimal analysis for many/multi-objective optimization problems. In fact, we can emphasize importance of the post-optimal analysis in actual engineering decision making. The proposed method is composed of two methods termed elite-induced multi-objective evolutionary algorithm for MOA and MOON2/MOON2R for MOP, respectively. After briefly showing ideas of these components developed previously by us, general procedure will be explained. Finally, a case study is provided to verify the effectiveness of the proposed method and explore some prospects of the post-optimal analysis.
  • 阪口 龍彦; 大谷 隼人; 清水 良明
    システム制御情報学会論文誌 = Transactions of the Institute of Systems, Control and Information Engineers 28 3 99 - 106 システム制御情報学会 2015年03月 [査読有り]
  • 清水 良明; 阪口 龍彦
    日本機械学会論文集 81 825 14 - 00639-14-00639 一般社団法人 日本機械学会 2015年 [査読有り]
     
    Under growing concerns with sustainability in global and changing market, cooperative and competitive logistic is becoming a keen issue to provide a manufacturing system aligned to sales and operations planning (S&OP). As a key technology for such deployment, this paper concerns with simultaneous pickup and delivery VRP and proposes a hybrid method aiming at a rational decision aid for logistics optimization. In its procedure, the initial solution is derived from the Weber basis saving method that accounts transportation cost in terms of the bi-linear model of distance and weight. Then, to update the tentative solution in turn, a modified tabu search developed previously by us is used successfully. Though this practical cost accounting has been used popularly in the strategic location problems, it has never been applied to the operational problem like VRP. The idea is possible to extend naturally to a non-linear or generalized Weber model to be more practical. Since the developed method is practical and adaptive even to large problems, it has high solution ability available for real world applications. Finally, numerical experiments are taken place to validate the effectiveness of the proposed method through comparison with an alternative manner to accomplish the present task.
  • Tatsuhiko Sakaguchi; Hayato Ohtani; Yoshiaki Shimizu
    ADVANCES IN PRODUCTION MANAGEMENT SYSTEMS: INNOVATIVE PRODUCTION MANAGEMENT TOWARDS SUSTAINABLE GROWTH (AMPS 2015), PT I 459 226 - 234 2015年 [査読有り]
     
    In recent years, sustainable and agile manufacturing is aimed at in many manufacturing industries. Reducing the waste of raw materials and managing the production schedule are important factors for such manufacturing. Nesting is an activity designing a cutting layout while scheduling is one managing operational procedures. Noting such nesting and scheduling in sheet metal processing, we need to consider those simultaneously for increasing the entire efficiency. This is because there often occurs a trade-off between them. To resolve such problem, we previously proposed an integrated method of nesting and scheduling. In order to enhance the scheduling ability that was insufficient in our method, this study extends the idea through a heuristic approach. Actually, we apply a local search to update the initial schedule which is decided by EDD based dispatching rule and manage it in terms of the criteria referring to the bottleneck process. Computational experiment is provided to validate the effectiveness of the proposed method.
  • Deployment of sustainable logistics optimization incorporated with modal shift and emission trading on carbon dioxide
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Hiroki Shimada
    Toward Sustainable Operations of Supply Chain and Logistics Systems, Springer 2015年 [査読有り]
  • Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Hiroki Shimada
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 9 5 2015年 [査読有り]
     
    Against global warming and environmental degradation, it is essential for modern logistics to make sincere efforts to resolve such environmental issues. However, that will likely degrade the economical efficiency under global competition. In fact, since it seems almost impossible to derive a reasonable solution individually, we need to face with the problem as whole society. Deployment of a green logistics incorporated with community-based action is a new paradigm realizing an infrastructure aligned with sustainable development. Noticing importance of such idea, this study concern a green logistics optimization associated with production methods of manufacturers and green attitude of consumers. Actually, for a three-echelon logistics network, we have developed a novel hierarchical method to optimize the production methods with different structures regarding cost and emission of carbon dioxide (CO2) at production sites, the available collection center, the paths between members of the logistics network and circular routes over consumers. In this problem, first we aim at minimizing either total cost or CO2 emission through controlling prone and aversion behaviors on sustainability of each logistic member. Then, to integrate these individual problems and evaluate them on the same basis, we have introduced an economic mechanism known as emission trading rate on CO2. Moreover, to discuss the sustainability in a broader logistics system, we note the modal shift in transportation. To show the significance of the proposed approach, we provide a case study and explore some prospects for community-based green logistics.
  • 阪口龍彦; 松本昂樹; 清水良明
    日本機械学会論文集(Web) 81 825 14-00640(J-STAGE) - 00640-14-00640 The Japan Society of Mechanical Engineers 2015年 [査読有り]
     
    In recent years, manufacturing industries are required to provide various kinds of products in a short time. They are also required to reduce the effects on the environment. In sheet metal processing, to achieve these requirements, process planning and production planning should be managed suitably. For process planning, nesting is done in order to design the optimal layout for sheet metal in terms of reduction of waste material. Scheduling is done in order to satisfy the due date of products. Nesting and scheduling are affected with each other and there occurs a certain trade-off between them. Therefore, those problems should be considered simultaneously in order to increase the efficiency of entire manufacturing activity. Under such understanding, we propose an integrated method of scheduling and nesting. In its procedure, scheduling is firstly executed by using dispatching rule. Then, based on the result of scheduling, nesting is executed by using bottom left algorithm. Moreover, to update the nesting result, the layout is redesigned by reallocating parts in each sheet metal according to its size. Finally, in order to validate the effectiveness of proposed method, we implemented prototype of nesting scheduling system and carried out computational experiments. The results are compared to a conventional method in terms of total tardiness and the number of sheet metal. To validate the effectiveness of reallocation, yield rate is also compared between the proposed method with and without reallocation.
  • A Meta-heuristic Approach for VRP with Simultaneous Pickup and Delivery Incorporated with Ton-Kilo Basis Saving Method
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    Logistics Operations, Supply Chain Management and Sustainability 2014年 [査読有り]
  • A Hierarchical Hybrid Meta-Heuristic Approach to Coping with Large Practical Multi-Depot VRP
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    Industrial Engineering & Management Systems 2014年 [査読有り]
  • Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Takatobu Miura
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 8 1 5 - 5 2014年 [査読有り]
     
    To cope with extremely large-scale logistic optimization for strategic planning and real time operational optimizations as well. in this paper, WC have proposed an extended algorithm of our hybrid method so that it becomes available for parallel computing. We have also developed a novel algorithm of particle swarm optimization (PSO) associated with binary decision variables. It is quite effective for finding the optimum opening distribution centers in three-echelon logistic network by parallel computing. Eventually, we have implemented the procedure in the parallel algorithm deployed as a multi-population based approach using multi-thread programming technique. Taking to topologies belonging to a coarse grain parallelism, we compared their effects on the performance of the algorithm through large scale logistics optimization Finally, we confirmed that the proposed method can bring about high performance for the parallel computing that is suitable for the present goal and circumstance through numerical experiments.
  • A Hybrid Meta-heuristic Method for Optimizing Logistic Networks Subject to Operational Conditions in Practice
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Syota Tsuchiya
    Global Perspective on Engineering Management 2013年 [査読有り]
  • Generalized Vehicle Routing Problem for Reverse Logistics Aiming at Low Carbon Transportation
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    Industrial Engineering & Management Systems 2013年 [査読有り]
  • Ram Chandra Poudel; Tatsuhiko Sakaguchi; Yoshiaki Shimizu
    Journal of Chemical Engineering of Japan 46 4 294 - 301 2013年 [査読有り]
     
    In the process of rolling of Quenched and Tempered (Q& T) reinforcement bars, it is required for bars to obtain both good strength and elongation properties. Many parameters associated with the raw material and process affect the final properties of bars. In industry, destructive tests cannot be performed frequently to measure the final properties of bars. This study is an attempt to investigate the usefulness of various computational methods in the design of data based quality prediction models for Q& T reinforcement bars. To work with the problem, twelve parameters related to the raw material and process were selected as inputs and three features as outputs. Then, multiple linear regression, principal components regression, partial least squares regression, artificial neural networks and locally weighted regression were sequentially implemented to construct prediction models. In advance, to increase the prediction quality, we have proposed a selective approach which has three different modules. Two of the three select the proper models through pre-screening the process in terms of the similarity of the query to the pre-determined clusters. The third approach tries to incorporate the local correction from the value predicted by global linear model. For the collected data from two real industries, the proposed selective approach outperformed the five individual prediction models in overall comparison. © 2013 The Society of Chemical Engineers, Japan.
  • Tatsuhiko Sakaguchi; Tatsuro Murakami; Shohei Fujita; Yoshiaki Shimizu
    ASME/ISCIE 2012 International Symposium on Flexible Automation, ISFA 2012 317 - 320 2012年 [査読有り]
     
    In sheet metal processing, several parts are cut from one sheet metal by punching process. Before punching process, layout of parts is decided by the nesting. If the parts are arranged as compactly as possible into one sheet metal, the waste of raw materials can be reduced. Therefore, the nesting is essential for optimizing the layout of parts. However, if the nesting is executed without considering the following manufacturing processes, there cause various inefficiencies all over the processes. Therefore, the nesting and the scheduling should be considered simultaneously for the efficient manufacturing. With this point of view, in this study, we propose an integrated method in terms of scheduling and nesting. Moreover, we verified the effectiveness of the proposed method through some computational experiments. Copyright © 2012 by ASME.
  • Vehicle Routing Problem Targeting CO2 Reduction under Cost Minimization Strategy
    Y. Shimizu; T. Sakaguchi; M. K. Gu
    International Journal of Logistics and SCM Systems 2012年 [査読有り]
  • Yoshiaki Shimizu; Toshiya Waki; Tatsuhiko Sakaguchi
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 6 7 1057 - 1070 2012年 [査読有り]
     
    To meet higher customer satisfaction and shorter production lead time under rapidly changing demands and global competition, importance of just-in-time and agile manufacturing is raising much more attentions than before. To cope with such circumstances, assembly line is shifting to mixed-model assembly line. Under such situation, it is essential to extend system boundary wider and resolve the problem totally. Moreover, in this study, we pay our attention to the latest production manner applied in car industry and extend our conventional model associated with due dates of finished products. Finally, we have formulated a bi-objective optimization problem that aims at reducing total sum of tardiness and total volume of inventories at the same time. Besides the usual one-through approach to solve the resulting problem, we adopt a two stage approach associated with multi-objective analysis. To reveal some properties of the proposed approaches, we provide a case study and discuss effectiveness of the method and usefulness of the results.
  • Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Theerayoth Pralomkarn
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 6 5 647 - 660 2012年 [査読有り]
     
    To meet higher customer satisfaction and shorter production lead time, assembly lines are shifting to mixed-model assembly lines. Accordingly, sequencing is becoming an increasingly important operation scheduling that directly affects on efficiency of the entire process. In this study, such sequencing problem at the mixed-model assembly line has been formulated as a bi-objective integer programming problem so that decision making through trade-off analysis can bring about significant production improvements. Then we have developed a multi-objective analysis method by hybridizing conventional and recent meta-heuristic methods. After showing its generic idea, the car mixed-model assembly line sequencing problem is concerned as a case study. Certain measures are also introduced to quantitatively evaluate the performances of the method through comparison.
  • Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Theerayoth Pralomkarn
    Proceedings of International Symposium on Scheduling 2011 29 - 34 日本機械学会 2011年07月 [査読有り]
     
    To meet higher customer satisfaction and shorter production lead time, assembly lines are shifting to mixed-model assembly lines. Accordingly, sequencing becomes an important operation scheduling that directly affects on efficiency of the entire process not staying at the mixed-model assembly line itself. In this study, the sequencing problem at the mixed-model assembly line has been formulated as a bi-objective integer programming problem so that trade-off analysis thereat may bring about significant production improvements. Then we have engaged in the multi-objective analysis in term of a hybrid approach of conventional and recent meta-heuristic methods. After showing the developed idea, the car mixed-model assembly line sequencing problem is concerned as a case study. Certain measures are also introduced to quantitatively evaluate the performances of the method through comparison.
  • Tatsuhiko Sakaguchi; Toshiaki Shimauchi; Keiichi Shirase
    SERVICE ROBOTICS AND MECHATRONICS 313 - + 2010年 [査読有り]
     
    A scheduling based collision avoidance method for integrated or multitasking machine is proposed in this paper. This method consists of two procedures. One is the operation sequence sorting to find the most suitable machining schedule which has the least collisions during machining operation. The other is the dwell insertion to avoid the collisions which occur in the most suitable machining schedule. This method realizes the automatic generation of collision free NC program for integrated or multitasking machine. This method was implemented and applied to some computational experiments to verify the effectiveness of the proposed method. In the computational experiments, the proposed method is able to generate a collision free NC program automatically for integrated or multitasking machine.
  • Jia Yee Chai; Tatsuhiko Sakaguchi; Keiichi Shirase
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 4 2 457 - 468 2010年 [査読有り]
     
    Trends of globalization and advances in Information Technology (IT) have created opportunity in collaborative manufacturing across national borders. A dynamic supply chain utilizes these advances to enable more flexibility in business cooperation. This research proposes a concurrent decision making framework for a three echelons dynamic supply chain model. The dynamic supply chain is formed by autonomous negotiation among agents based on multi agents approach. Instead of generating negotiation aspects (such as amount, price and due date) arbitrary, this framework proposes to utilize the information available at operational level of an organization in order to generate realistic negotiation aspect. The effectiveness of the proposed model is demonstrated by various case studies.
  • Jia Yee Chai; Tatsuhiko Sakaguchi; Keiichi Shirase
    IJAT 4 2 169 - 177 2010年 [査読有り]
  • 中本 圭一; 河野 智之; 小山 智; 阪口 龍彦; 白瀬 敬一
    精密工学会誌 74 12 1308 - 1312 公益社団法人精密工学会 2008年12月 [査読有り]
     
    In order to prepare a reliable NC program, which can avoid cutting troubles and achieve high machining productivity and accuracy, a sophisticated cutting process simulator is required to previously predict the target cutting operation. However, a conventional simulator using Z-map or B-rep model for representation of geometrical cutting shapes has the problem to treat geometrical cutting shapes which have overhang shapes or consist of successive tiny surfaces. Hence, in this study, voxel model is applied to predict the changes of geometrical cutting shape during the cutting operation. Voxel model generally expends large memory volume, therefore the octree data structure of voxels is adopted to reduce the memory consumption and improve the accuracy to represent complicated three-dimensional objects. Additionally, the developed cutting force simulator is integrated to the geometrical cutting shape simulator to predict cutting forces before the cutting operation. Cutting forces can be predicted by the cutting force simulator using cutting parameters such as depths of cut and stepover detected by the geometrical cutting shape simulator.
  • Tatsuhiko Sakaguchi; Toshihide Kamimura; Keiichi Shirase; Yoshitaka Tanimizu
    MANUFACTURING SYSTEMS AND TECHNOLOGIES FOR THE NEW FRONTIER 275 - + 2008年 [査読有り]
     
    A reactive scheduling method is one of the scheduling methods that improve an initial production schedule disturbed by environmental changes in manufacturing systems. In the previous research, Genetic Algorithm based reactive scheduling method have been proposed. In case of dealing with the aggregate production schedule, it is difficult to modify the initial schedule because of the unknown factors which occur in the manufacturing system. In this research, only part of the initial schedule is modified by setting the suitable scheduling range. Consequently, the reactive scheduling method can be applied for the aggregate production scheduling.
  • Jia Yee Chai; Tatsuhiko Sakaguchi; Keiichi Shirase
    MANUFACTURING SYSTEMS AND TECHNOLOGIES FOR THE NEW FRONTIER 261 - + 2008年 [査読有り]
     
    Trends of globalization and advances in Information Technology (IT) have created opportunity in collaborative manufacturing across national borders. A dynamic supply chain configuration is more adaptable by project based manufacturing environment characterize by the involvement of Small and Medium-sized Enterprises (SMEs). This research proposes a three echelons dynamic supply chain model where a job shop style manufacturer represents the center node being focused that will autonomously negotiates contracts with downstream client and upstream suppliers based on parameters derived from a reactive scheduling engine and an inventory management system. Furthermore a method is proposed to distribute delay penalties of previously contracted jobs to multiple new orders being negotiated simultaneously.
  • Tatsuhiko Sakaguchi; Toshihide Kamimura; Keiichi Shirase
    JOURNAL OF ADVANCED MECHANICAL DESIGN SYSTEMS AND MANUFACTURING 2 4 753 - 761 2008年 [査読有り]
     
    Unexpected disruptions often occur in the manufacturing systems. The manufacturing systems cannot execute the manufacturing operations in accordance with the predetermined production schedule due to such disruptions. Therefore, a systematic scheduling method is required to cope with such disruptions. In this research, distribution of processing time is described with the normal distribution. The reactive scheduling method for distribution of processing time is proposed in order to modify the predetermined production schedule. And the suitable re-scheduling period is considered through the computational experiments.
  • Reactive Scheduling Based Multi Objectives Negotiation for Dynamic Supply Chain Model
    CHAI Jia Yee; SAKAGUCHI Tatsuhiko; SHIRASE Keiichi
    Proceedings of the 4th International Conference on Leading Edge Manufacturing in 21st Century 655-660 2007年11月 [査読有り]
  • Yoshitaka Tanimizu; Tsuyoshi Miyamae; Tatsuhiko Sakaguchi; Koji Iwamura; Nobuhiro Sugimura
    TOWARDS SYNTHESIS OF MICRO - /NANO - SYSTEMS 5 65 - + 2007年 [査読有り]
     
    A genetic algorithm based reactive scheduling method was proposed in the previous research, in oder to modify and improve a disturbed initial production schedule without suspending the progress of manufacturing process. This paper proposes a new crossover method to improve the performance of the reactive scheduling method for total tardiness minimization problems and total flow time minimization problems. A multi-objective reactive scheduling method is also proposed based on the reactive scheduling method improved in this research. A prototype of multi-objective reactive scheduling system is developed and applied to computational experiments for job-shop type scheduling problems.
  • Y. Tanimizu; T. Sakaguchi; K. Iwamura; N. Sugimura
    International Journal of Production Research 44 18-19 3727 - 3742 2006年07月 
    A predetermined production schedule is often disturbed in agile manufacturing systems, due to unscheduled disruptions, such as delays of manufacturing operations and addition of new jobs. The objective of the research is to propose a new reactive scheduling method based on the Genetic Algorithm (GA), which generates improved production schedules reactively against the disturbances. A basic reactive scheduling method was proposed in the previous research. The proposed method continuously creates new feasible production schedules, until a new production schedule satisfies the given constraint or all the manufacturing operations have started. This paper deals with a new evolutional method to improve the performance of the GA-based reactive scheduling process for adding new jobs. Several computational experiments were carried out for the delays of manufacturing operations and the addition of new jobs by using the developed prototype system for reactive scheduling, in order to verify the effectiveness of the proposed method. © 2006 Taylor & Francis Group, LLC.
  • 阪口 龍彦; 谷水 義隆; 杉村 延広
    日本機械学會論文集. C編 71 711 3299 - 3305 一般社団法人日本機械学会 2005年11月 [査読有り]
     
    A systematic scheduling method is required to modify the predetermined production schedules in order to cope with unforeseen changes in manufacturing systems. The objective of the present research is to propose a scheduling method based on GA (Genetic Algorithm) for modifying delayed production schedules due to the additional jobs, reactively. A prototype of reactive scheduling system is developed and applied to scheduling problems. The effectiveness of the proposed method is verified through the numerical expreriments of the reactive scheduling problems.
  • Improvement of crossover operator in genetic algorithm for reactive scheduling
    SAKAGUCHI Tatsuhiko; TANIMIZU Yoshitaka; MIYAMAE Tsuyoshi; MAEDA Yasuhiro; SHIRASE Keiichi; SUGIMURA Nobuhiro
    Proc. of the 3rd international conference on leading edge manufacturing in 21st century 427-432 2005年10月
  • 谷水 義隆; 阪口 龍彦; 杉村 延広
    日本機械学會論文集. C編 69 685 2458 - 2463 一般社団法人日本機械学会 2003年09月 [査読有り]
     
    A systematic method is eagerly required to modify the predetermined production schedules in order to cope with unforeseen changes in manufacturing systems, such as delays of manufacturing processes. The objective of the present research is to propose a scheduling method based on GA (Genetic Algorithm) for modifying delayed production schedules reactively. A prototype of reactive scheduling system is developed and applied to scheduling problems. The effectiveness of the proposed method is verified through the comparison of the experimental results of the reactive scheduling with the ones of the rule-based real-time scheduling.

書籍

講演・口頭発表等

  • 阪口 龍彦; 早坂 太一; 大國 護慧; 稲垣 孝一; 飯島 優貴
    生産システム部門講演会講演論文集 2020年 一般社団法人 日本機械学会
     
    In Japan, aging of the population is accelerating year by year, and the number of people requiring care is also increasing. Demand for nursing care services is expected to increase further in the future. The demand for day-care facilities where provide care services to ambulatory users is particularly high. In the day-care facilities, it is necessary to pick up and drop off the user by car. Therefore, vehicle routing and sheet assignments should be determined considering not only the efficiency of transfer but also the physical and psychological conditions of the users. In this study, we propose a coevolutionary genetic algorithm-based method to determine the seat assignment for cars and the traveling route of users.
  • Yuto Arai; Takahiro Sakuraba; Shigenori Sano; Tatsuhik Sakaguchi; Naoki Uchiyama
    Proceedings of the 2019 IEEE/SICE International Symposium on System Integration, SII 2019 2019年04月 口頭発表(一般) 
    ? 2019 IEEE. Energy regenerative systems consisting of a combustion engine and an electric motor are widely used mainly for automobiles. However it is difficult to apply this type of hybrid system to personal mobilities and industrial machines in a factory, and thus the authors have developed a new type of regenerative brake systems. This study proposes a regenerative brake system using a spiral spring and magnetic gears or planetary gears instead of using an electric motor and a battery. Experimental results demonstrate the characteristic and effectiveness of the proposed systems, in which the regenerative ratio of approximately 30% with magnetic gears and 47% with planetary gears is confirmed.
  • 阪口 龍彦; 守屋 光崇; 内山 直樹; 森田 教夫; 新宅 英二
    年次大会 2019年 一般社団法人 日本機械学会
     

    As precut-process lumbers are packed and transported to the construction site, it is necessary to determine the packing style in consideration of the balance of the center of gravity, the ease of picking at the construction site, and the efficiency of the transportation. In our previous study, we proposed a rule-based stacking algorithm to determine the packing style of rectangular lumbers from the bottom side, but it was necessary to take into consideration the relationship between the upper and lower lumbers for preventing the inclining or dropdown the lumbers. In this study, we determine the packing style from the top side to simplify the relationship between the upper and lower lumbers. The effectiveness of the proposed method was validated through computational experiments.

  • 阪口 龍彦; 守屋 光崇; 内山 直樹; 森田 教夫; 小林 雄谷; 新宅 英二
    生産システム部門講演会講演論文集 2019年 一般社団法人 日本機械学会
     

    The precut-processed lumbers are carried from a precut factory to a construction site after cutting in a precut factory. To enhance the construction efficiency in the construction site, the precut-processed lumbers should sort in the order of the usage. On the other hand, for the efficiency of transportation, it is necessary to lower the height of the packaging lumber. In this research, therefore, we propose a heuristic method for stacking lumbers. In this method, we determine the position of lumbers without inclining while inserting supplement lumbers, according to the order of the usage of them.

  • 植松 洸也; 阪口 龍彦; 平松 大地; 平松 賢介
    生産システム部門講演会講演論文集 2019年 一般社団法人 日本機械学会
     

    To reduce the inventory of products for Tsukudani factories, we propose a production planning method considering the constraints of the production process that consists of cutting, burning, boiling, and packaging. The proposed method includes demand forecasting based on shipping record, requirements planning, and capacity planning. Finally, to validate the effectiveness of the proposed method, we implemented a prototype system and performed computational experiments.

  • Environment-adaptive GA based Nesting Scheduling for Sheet Metal Processing  [通常講演]
    Tatsuhiko Sakaguchi; Ryo Ishii; Naoki Uchiyama
    2018 International Symposium on Flexible Automation 2018年07月 口頭発表(一般) Kanazawa, Japan
  • 入所型介護施設を対象としたRPG型介護計画手法の研究  [通常講演]
    阪口龍彦; 緒方俊治; 内山直樹
    日本機械学会生産システム部門研究発表講演会2018講演論文集 2018年03月 口頭発表(一般) 東京 明治大学
  • Nshama William Enock; 白砂 絹和; 阪口 龍彦; 内山 直樹
    自動制御連合講演会講演論文集 2018年 口頭発表(一般)
  • 原田 祥吾; 泉 稜介; 白砂 絹和; 阪口 龍彦; 内山 直樹
    自動制御連合講演会講演論文集 2018年 口頭発表(一般)
  • Hendrawan Muldani Yogi; 白砂 絹和; 阪口 龍彦; 内山 直樹
    自動制御連合講演会講演論文集 2018年 口頭発表(一般)
  • 中川 将; 泉 稜介; 白砂 絹和; 阪口 龍彦; 内山 直樹
    自動制御連合講演会講演論文集 2018年 口頭発表(一般)
  • 守屋 光崇; 阪口 龍彦; 内山 直樹
    年次大会 2018年 口頭発表(一般) 

    Rectangular plate stacking problem is to determine the position of the rectangular plate in the designated area for minimizing the stacking height. In this study, we propose a heuristic method for solving the rectangular plate stacking problem. In our method, we combine the bottom left algorithm and the rule-based balancing algorithm is applied in order to decide the position of rectangular plates without plates falling down to the lower stages. The effectiveness of proposed method was validated through computational experiments.

  • Experimental Comparison of Contouring Performance and Consumed Energy between Adaptive versus Non-Adaptive Controllers for an Industrial Machine  [通常講演]
    Masaki Oda; Naoki Uchiyama; Tatsuhiko Sakaguchi
    IEEE 1st International Conference on Industrial Electronics for Sustainable Energy Systems 2018年01月 口頭発表(一般) Hamilton, New Zealand
  • 櫻庭崇紘; 内山直樹; 阪口龍彦
    計測自動制御学会システムインテグレーション部門講演会(CD-ROM) 2017年12月 口頭発表(一般)
  • Coevolutionary Genetic Algorithm Based Nesting Scheduling for Sheet Metal Processing  [通常講演]
    Tatsuhiko Sakaguchi; Kohki Matsumoto; Naoki Uchiyama
    The 9th Leading Edge Manufacturing in 21st Century 2017年11月 口頭発表(一般) Hiroshima, Japan
  • A Concurrent Negotiation Framework for Multi-client in Two Echelon Supply Chain  [通常講演]
    Tatsuhiko Sakaguchi; Van Tu Tran; Naoki Uchiyama
    International Design and Concurrent Engineering 2017 & Manufacturing Systems Conference 2017 2017年09月 口頭発表(一般) Osaka, Japan
  • 階層分散型生産システムのための作業時間の推定に基づくスケジューリング手法の研究  [通常講演]
    小熊和真; 阪口龍彦; 内山直樹
    日本機械学会2017年度年次大会講演論文集 2017年09月 口頭発表(一般) さいたま 埼玉大学
  • 阪口龍彦; 守屋光崇; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2017年03月 口頭発表(一般)
  • 櫻庭崇紘; 内山直樹; 阪口龍彦
    計測自動制御学会システムインテグレーション部門講演会(CD-ROM) 2016年12月 口頭発表(一般)
  • 石井涼; 阪口龍彦; 内山直樹
    スケジューリング・シンポジウム講演論文集 2016年09月 口頭発表(一般)
  • A Scheduling Method Using Genetic Algorithm and Dispatching Rule for Sheet Metal Processing  [通常講演]
    Tatsuhiko Sakaguchi; Tatsuya Tanaka; Yoshiaki Shimizu; Naoki Uchiyama
    2016 International Symposium on Flexible Automation 2016年08月 口頭発表(一般) Cleveland, USA
  • 阪口龍彦; 田中達也; 清水良明; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2016年03月 口頭発表(一般)
  • 阪口龍彦; 梅村良佑; 清水良明; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2016年03月 口頭発表(一般)
  • 阪口龍彦; TU Tran Van; 清水良明; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2016年03月 口頭発表(一般)
  • 阪口龍彦; 鈴木悠馬; 清水良明; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2016年03月 口頭発表(一般)
  • 阪口龍彦; 松本昂樹; 清水良明; 内山直樹
    日本機械学会生産システム部門研究発表講演会講演論文集 2016年03月 口頭発表(一般)
  • 櫻庭崇紘; 内山直樹; 佐野滋則; 阪口龍彦
    計測自動制御学会システムインテグレーション部門講演会(CD-ROM) 2015年12月 口頭発表(一般)
  • 田村慶太; 内山直樹; 佐野滋則; 阪口龍彦
    計測自動制御学会システムインテグレーション部門講演会(CD-ROM) 2015年12月 口頭発表(一般)
  • A Hybrid Approach for Multi-Depot VRPSPD Incorporated with Weber Basis Saving Method  [通常講演]
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Jae-Kyu Yoo
    Asia Pacific Industrial Engineering & Management Systems Conference 2015 2015年12月 口頭発表(一般) Ho Chi Minh, Vietnam
  • A Study on Scheduling Method for Hierarchical and Decentralized Manufacturing Systems  [通常講演]
    Tatsuhiko Sakaguchi; Yuma Suzuki; Yota Naraki; Yoshiaki Shimizu
    International Symposium on Scheduling 2015 2015年07月 口頭発表(一般) Kobe, Japan
  • 阪口龍彦; 大谷隼人; 清水良明
    日本機械学会生産システム部門研究発表講演会講演論文集 2015年03月 口頭発表(一般)
  • 阪口龍彦; 田中達也; 清水良明; 内山直樹
    自動制御連合講演会(CD-ROM) 2015年 口頭発表(一般)
  • A Meta-heuristic Approach for VRP with Simultaneous Pickup and Delivery Incorporated with Ton-Kilo Basis Saving Method  [通常講演]
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    9th International Congress on Logistics and SCM Systems 2014年07月 口頭発表(一般) Poznan, Poland
  • Genetic Algorithm Based Nesting Method with Considering Schedule for Sheet Metal Processing  [通常講演]
    Tatsuhiko Sakaguchi; Hayato Ohtani; Yoshiaki Shimizu
    ISCIE/ASME International Symposium on Flexible Automation 2014 2014年07月 口頭発表(一般) Awaji, Japan
  • 低炭素社会の実現に向けた階層型ロジスティックス最適化のハイブリッド解法―野菜ロジスティックスを例として―  [通常講演]
    嶋田弘希; 清水良明; 阪口龍彦
    日本機械学会生産システム部門講演会2014 2014年03月 口頭発表(一般) 東京 電気通信大学
  • 階層分散型生産システムにおける複数作業の重複を考慮したスケジューリング手法の研究  [通常講演]
    鈴木悠馬; 阪口龍彦; 清水良明
    日本機械学会生産システム部門講演会2014 2014年03月 口頭発表(一般) 東京 電気通信大学
  • 板金加工におけるネスティング・スケジューリング統合システムのためのネスティング手法の改良  [通常講演]
    松本昂樹; 阪口龍彦; 清水良明
    日本機械学会生産システム部門講演会2014 2014年03月 口頭発表(一般) 東京 電気通信大学
  • トンキロ基準セービング法を援用したVRPSPD問題のメタ解法の提案  [通常講演]
    加藤盛仁; 清水良明; 阪口龍彦
    日本機械学会生産システム部門講演会2014 2014年03月 口頭発表(一般) 東京 電気通信大学
  • Integrated Operation Planning and Scheduling System for Sheet Metal Processing  [通常講演]
    Tatsuhiko Sakaguchi; Tatsuro Murakami; Yoshiaki Shimizu
    Asia Pacific Industrial Engineering and Management System 2013年12月 口頭発表(一般) Cebu, Philippine
  • A Hierarchical Hybrid Meta-heuristic Approach for Coping with Large Multi-depot VRP in Practice  [通常講演]
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    Asia Pacific Industrial Engineering and Management System 2013年12月 口頭発表(一般) Cebu, Philippine
  • Three Echelon Logistics Optimization for Operational Planning  [通常講演]
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    International Symposium on Scheduling 2013 2013年07月 口頭発表(一般) Tokyo, Japan
  • 精密板金加工のための遺伝的アルゴリズムを用いた作業設計とスケジューリングの統合化の研究  [通常講演]
    村上達郎; 阪口龍彦; 清水良明
    日本機械学会生産システム部門講演会2013 2013年03月 口頭発表(一般) 東京 中央大学
  • スケジュールを考慮した遺伝的アルゴリズムによるネスティング手法の研究  [通常講演]
    大谷隼人; 阪口龍彦; 清水良明
    日本機械学会生産システム部門講演会2013 2013年03月 口頭発表(一般) 東京 中央大学
  • 階層分散型生産システムのための混流生産を考慮したスケジューリング手法の研究  [通常講演]
    猶木陽太; 阪口龍彦; 清水良明
    日本経営工学会中部支部研究発表会 2013年02月 口頭発表(一般) 名古屋 愛知工業大学
  • 清水良明; 阪口龍彦; 中田貴大
    日本機械学会年次大会講演論文集(CD-ROM) 2012年09月 口頭発表(一般)
  • 清水良明; 阪口龍彦; GU Minkyoung
    日本機械学会年次大会講演論文集(CD-ROM) 2012年09月 口頭発表(一般)
  • 阪口龍彦; 村上達郎; 清水良明
    日本機械学会年次大会講演論文集(CD-ROM) 2012年09月 口頭発表(一般)
  • A Scheduling Method with Considering Nesting for Sheet Metal Processing  [通常講演]
    T. Sakaguchi; T. Murakami; S. Fujita; Y. Shimizu
    2012 ASME/ISCIE International Symposium on Flexible Automation 2012年06月 口頭発表(一般) St. Louis, USA
  • 阪口 龍彦; Ram Chandra Poudel; 清水 良明
    精密工学会学術講演会講演論文集 2012年 口頭発表(一般) 
    鉄鋼材料の品質を制御するためには,いくつもの製造条件を設定する必要があり,その決定は非常に困難である.しかし,IT技術の発展により大量の製造実績データが蓄積されるようになり,そのデータから完成品の品質を予測し,製造条件のパラメータを決定することで高品質の製品を製造することが可能となる.本研究では,製造実績データに統計的手法や強化学習手法を適用し,鉄鋼材料の品質を予測する品質予測モデルを構築する.
  • 阪口龍彦; 藤田匠平; 村上達郎; 清水良明
    自動制御連合講演会(CD-ROM) 2011年11月 口頭発表(一般)
  • 阪口 龍彦; 村上 達郎; 藤田 匠平; 清水 良明; 白瀬 敬一
    年次大会 : Mechanical Engineering Congress, Japan 2011年09月 口頭発表(一般) 
    In sheet-metal processing, there are two requirements for efficient manufacturing. One is how to reduce the waste of raw materials. Another is how to make optimal schedules. In actual manufacturing system, it mainly tends to focus on the reduction of raw materials. Therefore, the allocation problem (nesting problem) which decides optimal allocation of parts into raw material is solved without considering manufacturing processes. However, trade-off relations exist between nesting problem and scheduling. Hence those problems might be considered simultaneously. In this study, in order to consider both problems simultaneously, the combinatorial method of dispatching-rule-based scheduling and rule-based nesting is proposed. The effectiveness of proposed method was verified through computational experiments.
  • 阪口龍彦; 村上達郎; 藤田匠平; 清水良明; 白瀬敬一
    日本機械学会年次大会講演論文集(CD-ROM) 2011年09月 口頭発表(一般)
  • Multi-Objective Analysis Applied to Mixed-Model Assembly Line Sequencing Problem through Elite Induced Evolutionary Method  [通常講演]
    Yoshiaki Shimizu; Tatsuhiko Sakaguchi; Therayoth Pralomkarn
    International Symposium on Scheduling 2011 2011年06月 口頭発表(一般) Osaka, Japan
  • 阪口龍彦; 村上達郎; 藤田匠平; 清水良明; 白瀬敬一
    日本機械学会東海支部総会講演会講演論文集 2011年03月 口頭発表(一般)
  • パウデル ラム チャンドラ; 阪口 龍彦; 清水 良明
    自動制御連合講演会講演論文集 2011年 口頭発表(一般) 
    鉄鋼材料の品質を制御するためには,様々な製造製造条件を設定する必要があり非常に困難である.しかし,計算機技術の発展により大量の製造実績データが蓄積されるようになり,そのデータを活用することで完成品の品質を予測することができる.本研究では,製造実績データに統計的手法およびニューラルネットワークによる学習を適用することで鉄鋼材料の品質を予測する品質予測モデルを構築する.
  • 阪口 龍彦; 藤田 匠平; 村上 達郎; 清水 良明
    自動制御連合講演会講演論文集 2011年 口頭発表(一般) 
    原材料から製品を製造する生産システムでは,材料の無駄を省きつつ,最適なスケジュールに基づき効率よく生産を行わなければならない.しかし,材料使用の効率化とスケジュールの最適化の間にはトレードオフの関係が存在する.そこで本研究では,これらを同時に考慮した最適な生産を行うために,ルールベースの作業設計に基づきスケジューリングを行うスケジューリング手法を提案する.
  • 阪口 龍彦; 辻 淳史; 白瀬 敬一
    年次大会講演論文集 : JSME annual meeting 2010年09月 口頭発表(一般) 
    It is important to manage the manufacturing system efficiently to acquire competitive edge in the current era of advanced information technologies and market globalization. Production scheduling is one of the important elements for managing the manufacturing system. Mass customization with small quantity production is a main trend these days, so information divergence tends to increase between the detailed daily work schedules in manufacturing level and mid/long-term schedule in management level. In this research, the cooperated scheduling method in which the mid/long-term scheduler and the daily work scheduler fine-tune independently each schedule is proposed.
  • 阪口 龍彦; 内田 匡紀; 白瀬 敬一
    年次大会講演論文集 : JSME annual meeting 2010年09月 口頭発表(一般) 
    In this research, to deal with the problem of causing the difference between the scheduling result with the scheduler and the progress report of the manufacturing process of the manufacturing premise even if the very best schedule is prepared beforehand, and leading to the failure of the plan, making the manufacturing execution system to collect, to arrange, to analyze results information on the manufacturing premise, and to feed back to production management and the scheduling system.
  • Multi-Objective Analysis of Periodic Review Inventory Problem with Coordinated Replenishment in Two-echelon Supply Chain System  [通常講演]
    Dicky Fatrias; Yoshiaki Shimizu; Tatsuhiko Sakaguchi
    4th International Symposium on Scheduling 2009年07月 口頭発表(一般) Nagoya, Japan
  • Dynamic Scheduling Algorithm for Autonomous Supply Chain Negotiation  [通常講演]
    J. Y. Chai; T. Sakaguchi; K. Shirase
    42nd CIRP Conference on Manufacturing Systems 2009年06月 口頭発表(一般) Grenoble, France
  • 小野 泰平; 阿部 剛; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2009年03月 口頭発表(一般)
  • 宇古 誠; 奥田 容子; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2009年03月 口頭発表(一般)
  • 古賀 進一郎; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2009年03月 口頭発表(一般)
  • 船津 竹史; 中本 圭一; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2009年03月 口頭発表(一般)
  • 西田 勇; 阪口 龍彦; 前田 正登; 白瀬 敬一
    ジョイント・シンポジウム講演論文集 : スポーツ工学シンポジウム : シンポジウム:ヒューマン・ダイナミックス : symposium on sports engineering : symposium on human dynamics 2008年11月 口頭発表(一般) 
    The analysis and clarification of man's physical properties are very important in the field of sport and welfare engineering. The results of these analysis and clarification contribute to the improvement of physical ability, the prevention of injury in sports, the effective rehabilitation and the evaluation of dynamic load in daily life. The solid body link model, which has been used for the analysis on human body performance, can estimate the force and torque which acts on each joint from the recorded human motion. However, the muscle functionality is not considered in the solid body link model. In order to evaluate the muscular power during human motion, the human musculo-skeletal model considering bi-articular muscle function is required. In this study, the basic two dimensional musculo-skeletal model of man's lower limb was constructed and the muscular power of each effective muscle was estimated from the recorded human motion. The lower limbs muscular power in vertical jump is estimated to verify the musculo-skeltal model constructed.
  • 阪口 龍彦; 藤原 弘明; Chai Jia Yee; 白瀬 敬一
    年次大会講演論文集 : JSME annual meeting 2008年08月 口頭発表(一般) 
    Trends of globalization and advances in Information Technology (IT) have created opportunity in collaborative manufacturing across national borders. A dynamic supply chain configuration is more adaptable by project based manufacturing environment. This research proposes a three echelons dynamic supply chain model where a MRP based manufacturer represents the center node being focused that will autonomously negotiates contracts with downstream client and upstream suppliers. Furthermore a method is proposed to distribute delay penalties of previously contracted jobs to multiple new orders being negotiated simultaneously.
  • 阪口 龍彦; 神村 俊秀; 白瀬 敬一
    生産システム部門講演会講演論文集 2008年07月 口頭発表(一般) 
    It is important for executing the manufacturing processes efficiently to create a suitable production schedule. However, the unscheduled changes such as the operational delay or addition of emergent jobs often occur in the actual manufacturing systems. Therefore, it is difficult to execute manufacturing processes in accordance with the predetermined schedule. In the previous research, Genetic Algorithm based reactive scheduling method have been proposed. It deals with the short-term schedule. In this research, the reactive scheduling method is extended for aggregate production schedule by setting the suitable scheduling range.
  • Study On Automatic Process Planning Support System For Integrated Milling-Turning Machine Tool  [通常講演]
    Y. Zhu; T. Sakaguchi; K. Shirase
    2008 International Symposium on Flexible Automation 2008年06月 口頭発表(一般) Atlanta, USA
  • Multi Orders Negotiation For Dynamic Supply Chain Model  [通常講演]
    J. Y. Chai; T. Sakaguchi; K. Shirase
    2008 International Symposium on Flexible Automation 2008年06月 口頭発表(一般) Atlanta, USA
  • GA Based Reactive Scheduling for Aggregate Production Scheduling  [通常講演]
    T. Sakaguchi; T. Kamimura; K. Shirase; Y. Tanimizu
    the 41st CIRP Conference on Manufacturing Systems, Manufacturing Systems and Technologies for the New Frontier 2008年05月 口頭発表(一般) Tokyo, Japan
  • Penalty Distribution Method for Scheduling Based Supply Chain Management  [通常講演]
    J. Y. Chai; T. Sakaguchi; K. Shirase
    the 41st CIRP Conference on Manufacturing Systems, Manufacturing Systems and Technologies for the New Frontier 2008年05月 口頭発表(一般) Tokyo, Japan
  • 乾 景太; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2008年03月 口頭発表(一般)
  • 新川 隆宗; 阪口 龍彦; 白瀬 敬一
    関西支部講演会講演論文集 2008年03月 口頭発表(一般)
  • Computational Simulation for Decision of Scheduling Period in Reactive Scheduling  [通常講演]
    T. Sakaguchi; T. Kamimura; K. Shirase
    The 4th International Conference on Leading Edge Manufacturing in 21st Century 2007年11月 口頭発表(一般) Fukuoka, Japan
  • Reactive Scheduling Based Multi Objectives Negotiation for Dynamic Supply Chain Model  [通常講演]
    J. Y. Chai; T. Sakaguchi; K. Shirase
    The 4th International Conference on Leading Edge Manufacturing in 21st Century 2007年11月 口頭発表(一般) Fukuoka, Japan
  • ボクセルモデルを取り入れたNC工作機械の自律制御に関する研究  [通常講演]
    船津竹史; 阪口龍彦; 中本圭一; 白瀬敬一
    2007年度精密工学会秋季大会学術講演会 2007年09月 口頭発表(一般) 旭川 旭川市ときわ市民ホール
  • 島内 寿明; 阪口 龍彦; 白瀬 敬一
    生産システム部門講演会講演論文集 2007年07月 口頭発表(一般) 
    In recent years, even in a job shop type production, much higher productivity is required. Multitasking machines are applied widely to reduce preparation time and to improve productivity. Generally, the multitasking machine has the functions for both of turning and milling operations. However, it means that collisions among tools, workpieces and machine tool itself often occur during machining operations. Therefore, the systematic collision avoidance method is needed. In this study, a scheduling method is applied to change the machining sequence to generate a collision free NC program effectively.
  • Reactive Scheduling Based on Status Monitoring for Dynamic Manufacturing Environment  [通常講演]
    T. Sakaguchi; T. Kamimura; K. Shirase; Y. Tanimizu
    40th CIRP international seminar on manufacturing systems 2007年05月 口頭発表(一般) Liverpool, UK
  • 製造進捗状況に基づくリアクティブスケジューリング  [通常講演]
    神村俊秀; 阪口龍彦; 白瀬敬一
    第51回システム制御情報学会研究発表講演会 2007年05月 口頭発表(一般) 京都 京都テルサ
  • 在庫情報に基づくサプライチェーン・マネジメントに関する研究  [通常講演]
    Chai Jia-Yee; 阪口龍彦; 白瀬敬一; 谷水義隆
    第51回システム制御情報学会研究発表講演会 2007年05月 口頭発表(一般) 京都 京都テルサ
  • 朱 彦; 阪口 龍彦; 白瀬 敬一
    精密工学会学術講演会講演論文集 2007年 口頭発表(一般) 
    複合加工機を効率良く柔軟に使いこなすために,新しい計算機支援技術の開発が急務となっている.本研究では,従来の対話入力方式と違い,幾何形状の構造情報や隣接関係を用いて,ターニングやミーリングなどの加工フィーチャーの認識をコンピュータに任せ,複合加工機の工程設計を自動化する3次元工程設計支援システムの開発を目標とする.
  • 神村 俊秀; 阪口 龍彦; 白瀬 敬一
    精密工学会学術講演会講演論文集 2007年 口頭発表(一般) 
    作業者により組立を行う生産現場などでは,作業時間のばらつきにより,あらかじめ作成した予定通りに作業が行われることは稀で,スケジュールの動的変更が必要となる.本研究では,作業時間のばらつきが正規分布に従うと仮定し,必要に応じて初期のスケジュールを修正するリアクティブスケジューリング手法を提案する.また,スケジュール修正の実施時期や,修正対象とする作業について,シミュレーション実験により検討を行う.
  • 河野 智之; 小山 智; 阪口 龍彦; 中本 圭一; 白瀬 敬一
    生産加工・工作機械部門講演会 : 生産と加工に関する学術講演会 2006年11月 口頭発表(一般) 
    In order to prepare a good NC program, which can avoid machining troubles and achieve high machining productivity and accuracy, a sophisticated machining process simulation is required to predict whole machining operation. In this study, the Voxel model is applied to predict change of geometrical machining shape during machining operation. Additionally, the cutting force simulator is integrated to the geometrical machining shape simulator to evaluate machining process before actual machining operation. Cutting parameters such as depths of cut and stepover can be detected by the geometrical machining shape simulation, and then cutting forces can be predicted by the cutting force simulation.
  • Multi-objective Reactive Scheduling Based On Genetic Algorithm  [通常講演]
    Y. Tanimizu; T. Miyamae; T. Sakaguchi; K. Iwamura; N. Sugimura
    The 11th International Conference on Precision Engineering 2006年08月 口頭発表(一般) Tokyo, Japan
  • ボクセルモデルによる加工形状シミュレーション  [通常講演]
    白瀬敬一; 河野智之; 阪口龍彦; 中本圭一
    精密工学会2006年度関西地方定期学術講演会 2006年08月 口頭発表(一般) 和歌山 和歌山大学
  • 神村 俊秀; 阪口 龍彦; 白瀬 敬一
    生産システム部門講演会講演論文集 2006年06月 口頭発表(一般) 
    Unscheduled delays of manufacturing processes often occur in the manufacturing systems, and an initial production schedule may not satisfy the constraints of make-span. Reactive scheduling method is one of the scheduling methods to cope with such delays effectively. In this research, new reactive scheduling method was proposed to modify an initial schedule by monitoring the progress of manufacturing processes consistently.
  • 田中 俊大; 阪口 龍彦; 白瀬 敬一
    生産システム部門講演会講演論文集 2006年06月 口頭発表(一般) 
    Cutting conditions are very significant parameters for process efficiency and quality in cutting operations. However, the decision of cutting conditions is depend too much on experience and know-how of skillful engineers, because of the difficulty to select suitable cutting conditions. In this research, the expert system based on Case-Based Reasoning is developed to select cutting conditions by processing case data which contain experience and know-how of skillful engineers. This system aims to adapt to the case data for selecting the user oriented cutting conditions.
  • Genetic algorithm based reactive scheduling for additional jobs  [通常講演]
    T. Sakaguchi; Y. Tanimizu; K. Shirase; N. Sugimura
    39th CIRP international seminar on manufacturing systems 2006年06月 口頭発表(一般) Ljubljana, Slovenia
  • Smart off-line teaching system for welding robot  [通常講演]
    K.Shirase; M. Yamasaki; T. Sakaguchi
    The 6th international conference on machine automation 2006年06月 口頭発表(一般) Seinajoki, Finland
  • ビジュアル・フィードバックによる産業用ロボットの位置誤差補正  [通常講演]
    荒尾荘太郎; 阪口龍彦; 白瀬敬一
    2006年度精密工学会春季大会学術講演会 2006年03月 口頭発表(一般) 野田 東京理科大学
  • 阪口龍彦; 谷水義隆; 白瀬敬一; 杉村延広
    自動制御連合講演会(CD-ROM) 2006年
  • 阪口 龍彦; 谷水 義隆; 白瀬 敬一; 杉村 延広
    自動制御連合講演会講演論文集 2006年 口頭発表(一般)
  • 阪口 龍彦; 金谷 智史; 白瀬 敬一
    自動制御連合講演会講演論文集 2006年 口頭発表(一般)
  • 阪口 龍彦; 神村 俊秀; 白瀬 敬一
    システム制御情報学会 研究発表講演会講演論文集 2006年 口頭発表(一般) 
    生産活動を行う際には,あらかじめ生産スケジュールを作成し,それに基づき生産活動を行う.しかし,生産活動中には作業の遅延がしばしば発生する.本研究ではこれまでに,作業の遅延量を既知とした場合について,適切に初期スケジュールを修正するリアクティブスケジューリング手法を提案してきた.本報では,作業の遅延量が未知の場合について,実際の作業の進行を適切に認識することで初期スケジュールを修正するリアクティブスケジューリング手法を提案する.
  • 谷水 義隆; 宮前 勇志; 前田 泰宏; 阪口 龍彦; 岩村 幸治; 杉村 延広
    精密工学会学術講演会講演論文集 2006年 口頭発表(一般) 
    著者らは,これまでに,遺伝的アルゴリズムを用いて,動的に生産スケジュールを改善するリアクティブスケジューリング手法を提案してきた.本研究では,総納期遅れ最小化問題および総滞留時間最小化問題において,交叉法の改良を行うとともに,これらを同時に考慮する多目的リアクティブスケジューリング手法を提案する.また,多目的リアクティブスケジューリングシステムのプロトタイプを開発し,本手法の有効性を検証する.
  • 白瀬 敬一; 森下 明範; 阪口 龍彦; 中本 圭一
    精密工学会学術講演会講演論文集 2006年 口頭発表(一般) 
    NC加工の問題点を解決するために,倣い加工の原理を計算機上にモデル化し,実時間で工具経路を生成する仮想倣い加工システムを開発してきた.ここでは,被削材をボクセルモデルで表現して, 3軸/5軸制御加工領域を自動で抽出するとか,加工形状のシミュレーションにより,加工領域の中で加工済部分を認識して無駄のない工具経路を生成するなどして,仮想倣い加工システムの問題点を解消する.
  • Improvement of crossover operator in genetic algorithm for reactive scheduling  [通常講演]
    T. Sakaguchi; Y. Tanimizu; T. Miyamae; Y. Maeda; K. Shirase; N. Sugimura
    The 3rd international conference on leading edge manufacturing in 21st century 2005年10月 口頭発表(一般) Nagoya, Japan
  • 産業用ロボットによるLEGOブロックの自律的組立作業  [通常講演]
    清原宏彰; 阪口龍彦; 白瀬敬一
    第5回サイバネティック・フレキシブル・オートメーション・シンポジウム 2005年10月 口頭発表(一般) 豊中 千里ライフサイエンスセンター
  • 阪口 龍彦; 谷水 義隆; 白瀬 敬一; 杉村 延広
    生産システム部門講演会講演論文集 2005年06月 口頭発表(一般) 
    A systematic scheduling method is required to modify the predetermined production schedules in order to cope with unforeseen changes in manufacturing systems. The objective of the present research is to propose a scheduling method based on GA (Genetic Algorithm) for modifying delayed production schedules due to the additional jobs, reactively. A prototype of reactive scheduling system is developed and applied to scheduling problems. The effectiveness of the proposed method is verified through the numerical experiments of the reactive scheduling problems.
  • 三村 暁生; 阪口 龍彦; 白瀬 敬一
    生産システム部門講演会講演論文集 2005年06月 口頭発表(一般) 
    The CAM system for machining is introduced in many companies. But the determination of processing procedures, cutting conditions, etc. is left to the expert engineers. And the automation in consideration of engineer's experiences and know-how is difficult and is not put in practical use. In this research, in order to realize the automation, the expert system to select cutting conditions with processing data is developed. In this system, cutting conditions are reasoned using the processing case data. This system is not necessary to express engineer's experiences and know-how as a rule, like rule-based reasoning.
  • リアクティブスケジューリングのための遺伝的アルゴリズムにおける交叉法の改良  [通常講演]
    阪口龍彦; 谷水義隆; 宮前勇志; 前田泰宏; 白瀬敬一; 杉村延広
    第49回システム制御情報学会研究発表講演会 2005年05月 口頭発表(一般) 京都 京都テルサ
  • 川本 順三; 阪口 龍彦; 谷水 義隆; 杉村 延広
    関西支部講演会講演論文集 2005年03月 口頭発表(一般) 
    A reactive scheduling method based on GA (Genetic Algorithm) was proposed in the previous research. The method can improve the delayed production schedules by unscheduled changes, without interrupting the progress of the manufacturing process. This research improves the reactive scheduling method for multi-objective problems by using multi-objective GA.
  • 山崎 正憲; 阪口 龍彦; 白瀬 敬一
    精密工学会学術講演会講演論文集 2005年 口頭発表(一般) 
    産業用ロボットによるアーク溶接作業のティーチングプログラム作成を自動化するために、溶接動作を溶接線の形状や溶接条件などにより分類?定義した「溶接フィーチャ」という新概念を提案する。過去の事例である溶接プログラムを溶接部位ごとに溶接フィーチャで分類しデータベース化する。新たな溶接部品に対しては溶接フィーチャで検索される過去の溶接動作を再編成および編集しながらティーチングプログラムを自動的に作成する。
  • 小山 智; 阪口 龍彦; 白瀬 敬一
    精密工学会学術講演会講演論文集 2005年 口頭発表(一般) 
    機械加工に欠かせないエンドミル加工について,幾何学的な切削モデルを用いて加工中の切削力をシミュレーションにより予測している.ここでは,スクエアエンドミルにおける円弧切削のシミュレーションを行って,円弧の大小による違い,凸部?凹部の違い,アップカット・ダウンカットの違い等々を比較検討した.
  • Genetic algorithm based reactive scheduling in manufacturing systems - Advanced crossover method for tardiness minimization problems -  [通常講演]
    Tatsuhiko Sakaguchi; Yoshitaka Tanimizu; Kazuhiro Harada; Koji Iwamura; Nobuhiro Sugimura
    International Conference on Machine Automation 2004年11月 口頭発表(一般) Osaka, Japan
  • 谷水 義隆; 宮前 勇志; 阪口 龍彦; 杉村 延広
    年次大会講演論文集 : JSME annual meeting 2004年09月 口頭発表(一般) 
    Unscheduled disruptions often occur in the actual manufacturing systems, and an initial production schedule may not satisfy the constraints due to the disruptions. A reactive scheduling method based on Genetic Algorithm (GA) was, therefore, proposed to improve the disturbed production schedule in the previous research. This research deals with improvement of the reactive scheduling method for consideration of setup operations. Setup operations are modeled, and the previous reactive scheduling method is modified to generate suitable production schedules that contain setup operations.
  • Genetic algorithm based reactive scheduling for emergent jobs  [通常講演]
    Yoshitaka Tanimizu; Tatsuhiko Sakaguchi; Nobuhiro Sugimura
    2004 Japan - USA Symposium on Flexible Automation 2004年07月 口頭発表(一般) Denver, Colorado
  • 谷水 義隆; 原田 和弘; 阪口 龍彦; 杉村 延広
    生産システム部門講演会講演論文集 2004年06月 口頭発表(一般) 
    Unscheduled disruptions often occur in the actual manufacturing systems, and an initial production schedule may not satisfy the constraints due to the disruptions. A reactive scheduling method based on Genetic Algorithm (GA) was, therefore, proposed to improve the disturbed production schedule in the previous research. This research deals with improvement of the reactive scheduling method for tardiness minimization problems. A new crossover method is proposed to generate more suitable individuals in the reactive scheduling process than the previous crossover method. A prototype of reactive scheduling system was developed to evaluate the effectiveness of the proposed method.
  • A study on reactive scheduling system based on genetic algorithm  [通常講演]
    Yoshitaka Tanimizu; Tatsuhiko Sakaguchi; Nobuhiro Sugimura; Koji Iwamura
    5th International Workshop on Emergent Synthesis 2004年05月 口頭発表(一般) Budapest, Hungary
  • 原田 和弘; 阪口 龍彦; 谷水 義隆; 杉村 延広
    関西支部講演会講演論文集 2004年03月 口頭発表(一般) 
    In the research, a reactive scheduling method based on GA (Genetic Algorithm) is proposed to modify the delayed production schedules. The proposed method modifies the predetermined production schedules from the viewpoint of tardiness, when unforeseen delays of manufacturing processes occur in the manufacturing systems. The proposed method modifies in consideration of alternative resources. Effectiveness of the proposed reactive scheduling method is verified through several computational experiments in terms of the optimization of the production schedules.
  • 宮前勇志; 川本順三; 原田和弘; 阪口龍彦; 谷水義隆; 杉村延広
    日本機械学会関西学生会卒業研究発表講演会講演前刷集 2004年03月
  • 川本 順三; 阪口 龍彦; 谷水 義隆; 杉村 延広
    精密工学会学術講演会講演論文集 2004年 口頭発表(一般) 
    本研究では,生産活動中に生じる作業の遅延や特急ジョブの追加などの外乱に対して遺伝的アルゴリズムを用いたリアクティブスケジューリング手法を提案してきた.これまでの研究では,総処理時間があらかじめ定めた基準を満たさなくなる場合に,生産活動を中断することなくスケジュールを改善する手法を提案した.本研究では,複数の目的関数を同時に改善することができるように拡張を行う.
  • Genetic algorithm based reactive scheduling for emergent jobs  [通常講演]
    Tatsuhiko Sakaguchi; Yoshitaka Tanimizu; Nobuhiro Sugimura
    the 2nd International Conference on Leading Edge Manufacturing in 21st Century 2003年11月 口頭発表(一般) Niigata, Japan
  • Reactive scheduling for unscheduled changes in manufacturing systems, Current trends in production management  [通常講演]
    Yoshitaka Tanimizu; Tatsuhiko Sakaguchi; Nobuhiro Sugimura
    the IFIP WG 5.7 Working Conference on Human Aspects in Production Management 2003年10月 口頭発表(一般) Karlsruhe, Germany
  • 川本順三; 原田和弘; 阪口龍彦; 谷水義隆; 杉村延広
    日本機械学会関西学生会卒業研究発表講演会講演前刷集 2003年03月
  • 谷水 義隆; 川本 順三; 阪口 龍彦; 原田 和弘; 杉村 延広
    精密工学会学術講演会講演論文集 2003年 口頭発表(一般) 
    これまでに著者らは,加工作業の遅延に対し,生産開始前に作成した生産スケジュールを,遺伝的アルゴリズムを用いて,適切な生産スケジュールに変更するリアクティブスケジューリング手法を提案した.本報告では,これを拡張して,加工中に発生した不良によるジョブの再投入や,オーダの不規則な追加に対して,リアクティブスケジューリングを行う方法を提案する.さらに,プロトタイプシステムを開発し,簡単な例題に適用する.
  • 阪口 龍彦; 谷水 義隆; 杉村 延広
    精密工学会学術講演会講演論文集 2003年 口頭発表(一般) 
    生産活動中に特急ジョブが発生した場合,迅速に初期スケジュールを変更する必要がある.本研究では,遺伝的アルゴリズムを用いて初期スケジュールを適切に改善するリアクティブスケジューリング手法を提案する.本報では,分岐限界法に基づき,初期スケジュールの総加工時間に影響を与えない時間区間にジョブを追加することにで,遺伝的アルゴリズムの初期個体群を生成する手法を提案する.
  • Reactive scheduling system for unforeseen delays of manufacturing processes  [通常講演]
    Yoshitaka Tanimizu; Tatsuhiko Sakaguchi; Nobuhiro Sugimura
    7th International Pacific Conference on Manufacturing & Management 2002年11月 口頭発表(一般) Bangkok, Thailand
  • 阪口 龍彦; 谷水 義隆; 杉村 延広
    精密工学会大会学術講演会講演論文集 2002年10月 口頭発表(一般)
  • Genetic algorithm based reactive scheduling in multi-layered manufacturing system  [通常講演]
    Yoshitaka Tanimizu; Tatsuhiko Sakaguchi; Kazuhiro Harada; Nobuhiro Sugimura
    2002 Japan - USA Symposium on Flexible Automation 2002年07月 口頭発表(一般) Hiroshima, Japan
  • 谷水 義隆; 阪口 龍彦; 原田 和弘; 杉村 延広
    精密工学会大会学術講演会講演論文集 2002年03月 口頭発表(一般)
  • 阪口 龍彦; 谷水 義隆; 杉村 延広; 原田 和弘
    関西支部講演会講演論文集 2002年 口頭発表(一般) 
    In the research, a reactive scheduling method based on GA (Genetic Algorithm) is proposed to modify the delayed production schedules. The proposed method modifies the predetermined production schedules reactively without interrupting the progresses of the manufacturing processes, when unforeseen delays of manufacturing processes are occurred in the manufacturing systems. A reactive scheduling method for multi-layered manufacturing systems is also proposed in order to modify the production schedules of all the layers concurrently and to keep the consistency among the production schedules of all the layers in the manufacturing systems. Effectiveness of the proposed reactive scheduling method is verified through several computational experiments in terms of the optimization of the production schedules and the computation time of the modification processes in the multi-layered manufacturing systems.
  • 阪口 龍彦; 谷水 義隆; 杉村 延広
    精密工学会大会学術講演会講演論文集 2001年09月 口頭発表(一般)
  • 谷水 義隆; 丁 顕仁; 阪口 龍彦; 杉村 延広
    年次大会講演論文集 : JSME annual meeting 2001年08月 口頭発表(一般) 
    Production scheduling tasks are carried out hierarchically and concurrently, such as production scheduling for manufacturing systems, for factories and for shops, by different persons and/or organizations. Therefore, a systematic procedure is eagerly required to change the production schedules and to keep the consistency among the hierarchical scheduling tasks, when some unforeseen disruptions occur in the manufacturing systems. A rescheduling method is proposed to change the production schedules and to keep the consistency among the production schedules of the hierarchical and decentralized manufacturing systems. A prototype of distributed reactive scheduling system for the hierarchical and decentralized manufacturing systems is developed and applied to the consistency management problems in the rescheduling tasks.
  • 谷水 義隆; 丁 顕仁; 阪口 龍彦; 杉村 延広
    ファクトリーオートメーション部門講演会講演論文集 2001年03月 口頭発表(一般) 
    Production scheduling tasks are in general carried out hierarchically and concurrently, such as scheduling for manufacturing systems, for factories and for shops, by different persons and/or organizations. Therefore, a systematic procedure is eagerly required to change the schedules and to keep the consistency among the hierarchical scheduling tasks, when some unforeseen disruptions occur in the manufacturing systems. A rescheduling method is proposed to change the schedules and to keep the consistency among the schedules of the large manufacturing systems. A prototype of distributed reactive scheduling system for large manufacturing systems is developed and applied to the consistency management problems in the rescheduling tasks.
  • 丁顕仁; 阪口龍彦; 谷水義隆; 杉本延広
    日本機械学会関西学生会卒業研究発表講演会講演前刷集 2001年03月
  • 谷水義隆; 岩村幸治; 阪口龍彦; 杉村延広
    電気学会全国大会講演論文集 2000年03月

MISC

受賞

  • 2020年03月 日本機械学会生産システム部門 日本機械学会98期生産システム部門 部門一般表彰 部門貢献表彰
  • 2013年03月 日本機械学会生産システム部門 日本機械学会91期生産システム部門 部門一般表彰 優秀講演論文表彰
     遺伝的アルゴリズムを用いたネスティングとスケジューリングの統合に関する研究 
    受賞者: 阪口 龍彦
  • 2005年06月 公益財団法人マザック財団 優秀論文表彰
     機械生産システムにおけるリアクティブスケジューリングシステムに関する研究 
    受賞者: 阪口 龍彦

共同研究・競争的資金等の研究課題

  • 日本学術振興会:科学研究費助成事業
    研究期間 : 2023年04月 -2026年03月 
    代表者 : 阪口 龍彦
  • 日本学術振興会:科学研究費助成事業 基盤研究(C)
    研究期間 : 2020年04月 -2023年03月 
    代表者 : 阪口 龍彦
     
    近年,インターネットショッピングの拡大,感染症に係る巣ごもり需要拡大による物流量の増大が著しい.国内物流の9割を占めるトラック輸送における輸送効率化は喫緊の課題となっている.特にラストワンマイル輸送と呼ばれる最終拠点からエンドユーザーへの輸送においては,道路交通事情や消費者の要望等,様々な条件下で配送計画を立てる必要がある.本研究では,車両への荷物の積み込み,荷物の顧客への巡回輸送をターゲットに,多目的最適化を可能とする共進化型ハイブリッドメタ解法の開発を試みる. 本研究で解決すべき問題は,(1)トラックに積載する荷物の配置の最適化,および(2)荷物を顧客に配達あるいは引取りする際の巡回経路の最適化,の2つである.ただし,客先では必ず荷物の積み下ろしが生じるため,これら2つの最適化問題には関連性があり,これを考慮しなければ高効率輸送が実現できない. 今年度は,トラックの荷台を2次元平面と考え,大きさの異なる矩形の荷物を,必要な荷台数が最小となるよう詰め込む長方形詰込み問題としてモデル化するとともに,荷台入り口付近から順次配送していく巡回路を生成することで,荷物の配置と巡回経路を同時に考慮できるよう配送計画問題をモデル化した.さらに,荷物の配置と巡回経路を同時に決定するために,先行研究で開発した異環境適応型遺伝的アルゴリズムを拡張した.提案手法の有効性を検証するために,地図上でランダムに抽出した86か所の地点を顧客とし,各顧客が1つの配送需要を持つ配送計画問題について,提案手法を用いて数値実験を行った.
  • 全体最適を考慮した循環型生産システムにおける生産管理方式
    日本学術振興会:科学研究費助成事業 基盤研究(C)
    研究期間 : 2017年04月 -2020年03月 
    代表者 : 柳 在圭; 阪口 龍彦; 前田 隆
     
    本研究の目的は、循環型生産システムにおいて収益性を損なわずに同時に環境配慮型社会の実現を果たすために、本研究で提案した「Pull-Push型生産方式」を援用した先進的な生産管理方式の開発にある。この研究の達成に向けて、本年度は、循環型生産システムの環境性を保ちながら、システムの効率化を促すことを可能であるPull-Push型生産方式を提案した上で、それを援用した先進的な生産管理方式の開発にある(研究成果として図書の「環境配慮のJIT生産」)。そのために、必要となる、循環型生産システムにおける全体最適化(経済性と環境性)モデルの開発とそれに伴う多目的最適化手法の開発を行った(研究成果として2件の国際研究会での発表)。 まず、Pull-Push型生産方式を援用した循環型生産システムにおける生産管理方式に関する研究では、「生産形態が異なる工程間」、「生産リードタイムが異なる工程間」、「平準化生産の対応」に対してPull-Push型生産方式の有効性を示した上で、閉ルールシステムである循環型生産システムにも拡張可能性を示した。さらに、多目的最適化手法に関する研究では、循環型生産システムにおける全体最適化(経済性と環境性)を目指してその有効な解法を定着させるために、新たな多目的進化アルゴリズム(MOEA; Multi-Objective Evolutionary Algorithm)を提案した。
  • 異環境適応型アプローチによる設計と計画の多目的最適化
    日本学術振興会:科学研究費助成事業 基盤研究(C)
    研究期間 : 2017年04月 -2020年03月 
    代表者 : 阪口 龍彦
     
    素材加工型産業の一つである精密板金加工の生産システムにおいては,原材料の無駄の削減を実現するための加工レイアウトの最適化,納期遵守の高効率生産を行うための生産スケジュールの最適化という,2つの最適化を同時に実現する必要がある.本研究は,この問題に対し,異環境適応型進化手法による解決を試みる. 研究の初年度には,精密板金加工のネスティング問題およびスケジューリング問題を異なる環境とみなし,加工する部品名の配列で構成される遺伝子構造を持つ個体が環境を移住しながら進化する異環境適応型遺伝的アルゴリズム(異環境適応型GA)を提案した. ネスティング問題とスケジューリング問題は,問題設定によりトレードオフ関係である場合と,両者とも最小化可能な場合とがある.この関係性は事前に知ることは難しく,求解過程で判明するのが一般的である.そこで研究2年目にあたる本年度は,異環境適応型GAを拡張し,スケジューリングおよびネスティング問題に対して別々の遺伝子構造を持つ個体が共存し,共進化する共進化遺伝的アルゴリズムを提案した.スケジューリングおよびネスティングの個体の組合せが一つのネスティング・スケジューリング解を表し,その組合せの選び方により探索可能な解空間が変化する.そこで,トレードオフ解析に有効な組合せ,あるいは同時最小化に有効な組合せ,両者の中間など,多種多様な解を探索するために,様々な個体の組合せ法を構築した. 提案手法の有効性を検証するために,ネスティング・スケジューリングシステムのプロトタイプを開発し,計算機実験を行った.
  • 日本学術振興会:科学研究費助成事業 若手研究(B)
    研究期間 : 2015年04月 -2017年03月 
    代表者 : 阪口 龍彦
     
    精密板金加工生産システムを対象に,作業設計である金属板の加工レイアウトの最適化と,スケジュールの最適化を同時に行うために,共進化遺伝的アルゴリズムによる同時最適化アルゴリズムを構築した.まずスケジューリングの精度を向上させるために部品構成を考慮した適応度の設計,加工工程ごとに適したスケジューリング法を融合させるハイブリッド解法を提案した.次に作業設計とスケジューリングを統一的に扱うためにコストによる評価関数を設計し,効率よい共進化プロセスのための遺伝子のグループ化に基づく共進化アルゴリズムを提案した.アルゴリズムの有効性を数値実験により検証し,コスト削減が期待できることを示した.
  • 日本学術振興会:科学研究費助成事業 基盤研究(C)
    研究期間 : 2013年04月 -2016年03月 
    代表者 : 清水 良明; 柳 在圭; 阪口 龍彦
     
    本研究では革新的なロジスティックス分野における問題解決手段の一つとして最適化工学の展開を目指した。そしてこの方術、方略及び運用レベルの各々に関わり、全体として包括的な最適化のためのユーザビリティの高いフレームワークの構築を行った。最初に各々の問題に対して一般的かつ現実的な議論ができるようウェーバ基準の輸送費勘定に従う数学モデルを与え、次いで現実規模の問題求解のための階層的ハイブリッドメタ解法の開発を行うという研究方法をとった。各々の解法はそれ自体が有用であるだけでなく、本フレームワークの中で利活用することで社会の多様なダイナミズムに応え得るスマート・レジリエントな展開が期待されることを示した。
  • 日本学術振興会:科学研究費助成事業 基盤研究(B)
    研究期間 : 2005年 -2007年 
    代表者 : 白瀬 敬一; 中本 圭一; 阪口 龍彦
     
    1.ボクセルモデルに基づく加工シミュレータ 加工中の被削材形状の変化を予測する目的で,ボクセルモデルに基づく加工シミュレータを開発した.ボクセルモデルにオクトツリー構造を導入し,必要な部分だけを微細なボクセルで表現することで,モデルの精度を確保しながらボクセル使用量(計算機のメモリ使用量)を抑制し,実用的な加工シミュレーションが可能であることを検証した.また,ボクセルモデルの特徴を活かした同時5軸加工の加工シミュレーションも実現した. 2.エンドミル加工の切削力シミュレータ 加工中の切削力を予測する目的で,エンドミル加工の切削力シミュレータを開発した.スクウェアエンドミルとボールエンドミルを対象に,加工中の切削力が十分な精度で予測可能であることを検証した.さらに加工シミュレータと連携することで,加工中の被削材の形状変化を計算しながら切削力を予測することができるバーチャルマシニングシシミュレーションを実現した. 3.5軸制御工作機械のための工程設計支援システム 5軸加工の特徴である工具姿勢の自由度を有効に利用した高能率な加工を実現する目的で,5軸制御工作機械のための工程設計支援システム(工具姿勢の決定法)を開発した.工程設計支援システムでは,ボクセルモデルで表現した被削材およびツーリングを利用して,干渉チェックと工具経路生成を高速で行う手法を考案し,加工能率の高い工具姿勢を高速に計算した. 4.自律型工作機械のためのスケジューリングシステム スマートNCプロセッサで実現される自律的な工作機械の柔軟な運用を実現する目的で,スケジューリングシステムが加工状況をリアルタイムに監視しながら作業スケジュールを動的に変更することができるリアクティブスケジューリングシステムを開発した.作業時間の変動やばらつきに対しても作業スケジュールが柔軟に更新されることを計算機実験によって確認した.
  • 板金加工生産システムのための設計と計画の統合化の研究
    (財) 永井科学技術財団:平成29年度素形材融合分野奨励金
    代表者 : 阪口 龍彦

委員歴

  • 2022年09月 - 現在   スケジューリング学会   理事
  • 2019年04月 - 現在   日本機械学会   日本機械学会論文集 設計,機素・潤滑,情報・知能,製造,システム カテゴリ アソシエイトエディタ
  • 2005年04月 - 現在   精密工学科   事業企画委員会企画第3グループ委員
  • 2005年04月 - 現在   精密工学科   総合生産システム専門員会特別委員
  • 2018年09月 - 2022年08月   スケジューリング学会   評議員
  • 2019年04月 - 2021年03月   精密工学会   事業部会事業企画委員会第3グループリーダー
  • 2018年04月 - 2019年03月   精密工学会   事業企画委員会企画第3グループサブリーダー
  • 2017年04月 - 2019年03月   日本機械学会   生産システム部門表彰委員会委員長
  • 2017年04月 - 2019年03月   日本機械学会   生産システム部門幹事
  • 2016年04月 - 2017年03月   日本機械学会   生産システム部門表彰委員会幹事
  • 2016年04月 - 2017年03月   日本機械学会   生産システム部門東海支部代議員
  • 2015年04月 - 2017年03月   日本機械学会   東海学生会顧問
  • 2016年04月   日本機械学会   生産システム部門運営委員
  • 2013年10月 - 2015年03月   日本機械学会   日本機械学会論文集特集号「生産システムの新展開」アソシエイトエディタ
  • 2013年04月 - 2015年03月   日本機械学会   校閲委員
  • 2013年11月 - 2014年10月   日本機械学会   日本機械学会英文電子ジャーナルJournal of Advanced Mechanical Design, Systems, and Manufacturing特集号「Advanced Production Scheduling」編集委員
  • 2013年04月 - 2014年03月   日本機械学会   トピックス委員
  • 2010年04月 - 2014年03月   日本機械学会   生産システム部門東海支部代議員
  • 2010年04月 - 2014年03月   日本機械学会   生産システム部門運営委員
  • 2011年04月 - 2012年03月   日本機械学会   生産システム部門広報委員会幹事
  • 2010年04月 - 2012年03月   日本機械学会   校閲委員
  • 2008年04月 - 2009年03月   日本機械学会   RC240多軸複合工作機械の高度化技術に関する研究分科会研究協力委員
  • 2006年04月 - 2008年03月   日本機械学会   RC229多軸工作機械における先進技術に関する研究分科会研究協力委員
  • 2005年04月 - 2006年03月   日本機械学会   RC216多軸制御工作機械とその利用技術に関する研究分科会研究協力委員

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