Dr. of Engineering, Kyoto University

Product Planning

Production Management

Workforce Scheduling

Production Scheduling

Product Lifecycle Management

Environment Conscious Manufacturing Systems

製品計画

生産管理

ワークフォーススケジューリング

生産スケジューリング

プロダクトライフサイクルマネジメント

環境配慮型生産システム

Manufacturing technology (mechanical, electrical/electronic, chemical engineering), Manufacturing and production engineering

Social infrastructure (civil Engineering, architecture, disaster prevention), Safety engineering

Social infrastructure (civil Engineering, architecture, disaster prevention), Social systems engineering

Oct. 2001
University of Electro-Communications, Professor

Sep. 1995 - Sep. 2001
University of Electro-Communications, Associate Professor

Aug. 1989 - Aug. 1995
Kyoto University, Faculty of Engineering, Research Associate

Apr. 1982 - Jul. 1989
Himeji Institute of Technology, Research Associate

Apr. 1978 - Mar. 1980
Osaka University, Graduate School, School of Engineering, Department of Industrial Mechanical Engineering

Apr. 1974 - Mar. 1978
Osaka University, Faculty of Engineering, Department of Industrial Mechanical Engineering

Apr. 2012 - Mar. 2016
総務委員会委員長, 日本情報経営学会, Society

Jul. 2003 - Jul. 2009
会員委員会委員, 日本経営工学会, Society

Apr. 2007 - Mar. 2009
投稿論文委員会委員, 日本情報経営学会, Society

Apr. 2007 - Mar. 2009
理事, 日本情報経営学会, Society

2004 - Sep. 2008
副会長, スケジューリング学会, Society

Oct. 2003 - Mar. 2007
投稿論文委員会委員長, オフィスオートメーション学会, Society

2000 - Mar. 2007
理事, オフィスオートメーション学会, Society

2003 - 2004
理事, スケジューリング学会, Society

2000 - 2003
評議員, スケジューリング学会, Society

1998 - 2000
理事, スケジューリング学会, Society

1995 - 2000
幹事（投稿論文担当）, オフィスオートメーション学会, Society

May 2004
International Symposium on Scheduling 2004, Best Paper Award for Scheduling Practice

Jun. 1985
工作機械技術振興賞(論文賞)

Decline-stage Analysis of Product Life Cycles for Electronic Equipment
Takashi Sakamoto; Kenji Yura
J. Jpn. Ind. Manage. Assoc, Japan Industrial Management Association, 66, 4, 327-334, 2016, Peer-reviwed, In current society, new electronic equipment is developed and used according to the needs of consumers. As time passes, the products become obsolete as the result of competitive product development, and they are replaced by products with more or improved functions and offered at a cheaper price. The product life cycle is referred to as "PLC" and it consists of four stages: introduction, growth, maturity and decline. In the decline stage of the PLC, the manufacturer has to analyze the market behavior, and judge how long the current product will be sold and when the next-generation product will be introduced. This paper proposes a new model and methods to analyze the decline stage. On the background of the decline behavior in the PLC for electronic equipment, technological progress enables various functions to be incorporated into a single product according to a consumers need. This paper focuses on the shift from single-function products to multifunction products, and analyzes the phenomena using a regression analysis for current products and determining the number of newly developed products to produce.
Scientific journal, Japanese

Comparative Analysis of Growth of Japanese Smartphones Market and its Worldwide Tendency
Takashi Sakamoto; Kenji Yura
Proceedings of 31st Pan-Pacific Conference: Designing the Shared Future through Co-Creation, 299-301, Jun. 2014
International conference proceedings, English

A Multiobjective Model for Locating Drop-off Boxes for Collecting Used Products
Ken-ichi Tanaka; Hirokazu Kobayashi; Kenji Yura
Industrial Engineering & Management Systems, The Korean Institute of Industrial Engineers, 12, 4, 351-358, 31 Dec. 2013, Peer-reviwed
International conference proceedings, English

Optimal Design of Multistage Parallel-stations Systems for Disassembly and Sorting Operations
村田潤一; 由良憲二
Journal of JIMA, 64, 2, 128-137, Jul. 2013, Peer-reviwed
Scientific journal, Japanese

A Multiobjective Model for Locating Drop-off Points for Collecting Used Products
K. Tanaka; H. Kobayashi; K. Yura
Proceedings of the Asia Pacific Industrial Engineering & Management Systems Conference, 1620-1626, Dec. 2012
International conference proceedings, English

Dematerialization and 3R Aiming to Decrease a Metabolic Rate
Kenji Yura
APCIM 2012 Proc., USB memory, Session 8 (Abstrac, Aug. 2012
International conference proceedings, English

Manufacturing Systems for Environmental Excellence
Kenji Yura
日本情報経営学会誌, 32, 4, 11-16, May 2012
Scientific journal, Japanese

Logistics Systems for Products Refurbishment
Sho Tamura; Kenji Yura
Proceedings of Global COnference on Sustainable Product Development and Life Cycle Engineering: Sustainability and Remanufacturing IV, 98-104, Sep. 2008, Peer-reviwed
International conference proceedings, English

Information Architecture for Environment-Conscious and Enduser-Oriented PLM
K. Yura; M. Inoue; M. Ishii; H. Ishikawa; K. Morishige; M. Takata; S. Umetani; T. Yamada
Proceedings of EcoDesign 2007, CD P12, Dec. 2007
International conference proceedings, English

Products Refurbishment and its Logistics in Environment Conscious Product Lifecycle Management
Kenji Yura
Proceedings of the 4th International Conference LEM21, 669-672, Nov. 2007, Peer-reviwed
International conference proceedings, English

Dynamic Fluctuation of Inventory Levels in a Closed-Loop Supply Chain
Kenji Yura
Proceedings of ISCM2006, 231-237, Nov. 2006
International conference proceedings, English

A Framework for Environment-Conscious and Enduser-Oriented PLM
T. Yamada; M. Inoue; M. Ishii; H. Ishikawa; K. Morishige; M. Takata; S. Umetani; K. Yura
Proceedings of IV Global Conference on Sustainable Product Development and Life Cycle Engineering, CD(IST01: No.85), Oct. 2006
International conference proceedings, English

Environmental Impacts of Product Refurbishment Systems
Kenji Yura
Proceeding of the 18th International Conference on Production Research, CD(in Session 50: Recycling), Aug. 2005, Peer-reviwed
International conference proceedings, English

Online scheduling aiming to satisfy due date for flexible flow shops
K Takaku; K Yura
JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING, JAPAN SOC MECHANICAL ENGINEERS, 48, 1, 21-25, Mar. 2005, Peer-reviwed, The simplest method for making a production schedule is dispatch of jobs to idle machine tools. The method has a tendency of making a compact and efficient schedule, however the completion time of a job is not determined till the job is selected as the next job on an idle machine. Then, online scheduling methods have been developed, in which the production schedule is made as a job arrives at a machine. In this paper, an online scheduling method is developed for flexible flow shops under the due-date related criteria. A special feature of the method is to set the target completion time for each job and each stage. By numerical experiments, it is clarified that the method is better than FIFO (First In First Out) rule and especially the performance of the online scheduling is greatly superior to FIFO for the shops with heavy workload.
Scientific journal, English

Interactive multi-shift scheduling to satisfy worker's preferences on shift and days-off
G Shiotani; K Yura
JSME INTERNATIONAL JOURNAL SERIES C-MECHANICAL SYSTEMS MACHINE ELEMENTS AND MANUFACTURING, JAPAN SOC MECHANICAL ENGINEERS, 48, 1, 26-30, Mar. 2005, Peer-reviwed, Multi-shifts working condition is harder than the single shift one, and it is expected that the working condition be improved. One of approaches for the improvement is to make the work schedule so as to achieve the worker's preference on it as large as possible. The preference depends on each of workers and it may vary with the time. Tackling with such a situation, an interactive multi-shift scheduling method is proposed in the paper. The method checks the feasibility of workers' preferences, makes a fundamental shift schedule, and improves the schedule by shifts exchange between the workers. A necessary condition of a feasible schedule is clarified, and a prescreening procedure on the feasibility is developed. By the method, the workers' preferences on shifts are reflected in the shift schedule as large as possible.
Scientific journal, English

Products Management System Based on Product States Monitoring to Decrease Environmental Impacts
Kenji Yura; Ryou Yanagi
Proceedings of International Conference on OA & Information Management, 196-203, Nov. 2004, Peer-reviwed
International conference proceedings, English

Interactive Multi-Shift Scheduling to Satisfy Worker's Preference on Shift and Days-Off
Gakuhei Shiotani; Kenji Yura
Proceedings of International Symposium on Scheduling 2004, 168-171, May 2004, Peer-reviwed
International conference proceedings, English

Online Scheduling for Flexible Flow Shops with Due Data Constraint
Koichiro Takaku; Kenji Yura
Proceedings of International Symposium on Scheduling 2004, 180-183, May 2004, Peer-reviwed
International conference proceedings, English

生産の環境負荷と経済性
由良憲二
オフィス・オートメーション学会誌, 24, 2, 55-59, Jul. 2003
Scientific journal, Japanese

ITと環境
由良憲二
オフィス・オートメーション学会誌, 22, 3, 12-16, Sep. 2001
Scientific journal, Japanese

Performance Analysis of LPT-Based Scheduling Algorithm for a Pair of Uniform Machines
K. Yura; D. Yang
Proceedings of the 16th International Conference on Production Research, Aug. 2001
International conference proceedings, English

Cyclic schedules in production and operations management
Kenji Yura
International Journal of Manufacturing Technology and Management, 3, 3, 273-292, 2001, The peculiar feature of cyclic schedules is the repetitive occurrence of a pattern in the schedule. Such schedules often appear in manufacturing environments and the scheduling problems have attracted considerable attention. In this article, after explaining the typical analytical methods, some important features and planning procedures are explained for cyclic scheduling of flow-shop type manufacturing systems, job-shop-type manufacturing systems, and other related problems in manufacturing activities. © 2001 Inderscience Enterprises Ltd.
Scientific journal, English

A proposal of recycling-oriented industrial systems
Katsundo Hitomi; Kazumasa Ohashi; Kazushige Okuda; Masaharu Ota; Kenji Yura; Hiroki Ishikura
International Journal of Manufacturing Technology and Management, 3, 3, 325-337, 2001, Green and clean environment is a watchword in the current society. Government-supported activities are directed towards making the surroundings cleaner and greener. Industries are penalized if their effect on the environment goes beyond a certain tolerable limit. The strict control measures imposed by the government and consumers have forced industries to adopt changes in their production methods to reduce pollution and refuse dumping levels. Many industries are of course tackling the problems positively by themselves. Recycling methods are practised by major industries and institutes to reduce impact on the environment. In this article, a new approach which aims at ‘Recycling-Oriented Industrial Systems (or Complex)’ is proposed to prevent environmental degradation. In this new system the reuse of industrial waste is given major attention. In order to accomplish this task more efficiently, production and waste treatment facilities must be unified to become like the circulation system of human blood. Reproduction and reuse of objects are studied meticulously along with information flow and the evaluation of the economy from the viewpoint of an engineering design. The new system intends to make the world a better, safer and cleaner place to live. © 2001 Inderscience Enterprises Ltd.
Scientific journal, English

IT革命について考える（アンケート結果に対するコメント）
由良憲二
オフィス・オートメーション学会誌, 21, 3, 12-13,22-23, 2001
Scientific journal, Japanese

循環型生産システムの物の流れに関する諸問題
由良憲二
オフィス・オートメーション学会誌, 21, 3, 37-40, Oct. 2000
Scientific journal, Japanese

An Enhanced Model of Supply Chain Management for Recycling-Oriented Manufacturing Systems
K. Yura
Proceedings of the 2000 MIS/OA International Conference, 478-483, Jun. 2000
International conference proceedings, English

Parts-mix analysis in recycling-oriented manufacturing systems for multiple-item production
K Yura; H Ishikura; K Hitomi
INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH, TAYLOR & FRANCIS LTD, 38, 2, 447-456, Jan. 2000, One solution to environmental problems is to construct a recycling-oriented manufacturing system, in which waste products after consumption are collected, and reusable parts in the collected products are employed to produce new products. A parts-mix in the manufacturing system for multiple-item production is analysed by taking into consideration the merits and demerits of the usage of common parts over multiple products and special parts utilized for individual products. The parts-mix problem is formulated to minimize the life-cycle cost, which consists of production costs and recycling costs. The property of the optimal parts-mix is clarified, and a decision procedure to solve the parts-mix is developed. The procedure decides whether the common parts are effective or not.
Scientific journal, English

コンピュータ統合事業システムの多基準評価法に関する研究
鈴木 淳; 由良憲二; Ljubisa Lracic; 松井正之; 荻原洋太郎
経営情報学会誌, 経営情報学会誌編集事務局, 8, 3, 41-54, Dec. 1999, Peer-reviwed
Scientific journal, Japanese

Bounds for LPT scheduling problem on uniform machines
D. Yang; K. Yura
The Second Asia-Pacific Conference on Industrial Engineering and Management Systems, 117-120, Oct. 1999
International conference proceedings, English

Strategies of pricing recyclable products in recycling-oriented manufacturing systems
K. Yura
The Second Asia-Pacific Conference on Industrial Engineering and Management Systems, 299-302, Oct. 1999
International conference proceedings, English

Cyclic Scheduling for Multi-Product Re-Entrant Manufacturing Systems
K. Yura
Proceedings of the 15th Conference of the International Foundation for Production Research, 1, 329-332, Aug. 1999
International conference proceedings, English

Cyclic scheduling for re-entrant manufacturing systems
K Yura
INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS, ELSEVIER SCIENCE BV, 60-1, 523-528, Apr. 1999, Peer-reviwed, A scheduling method is elucidated for the re-entrant manufacturing systems, where the process route of a job passes production facilities one or more times. The objectives of the scheduling problem are maximization of the production rate as a primary one and minimization of the throughput time as a secondary one. The method makes the cyclic schedule, where an adequate number of jobs are treated as a lot and the lot is cyclically released into the system. The lot size is determined to maximize the production rate, and a sequencing method of the lots is developed to minimize the throughput time. (C) 1999 Published by Elsevier Science B.V. All rights reserved.
Scientific journal, English

コンピュータ統合事業アーキテクチャーの多基準に基づく評価に関する研究
松井正之; Ljubisa Vlacic; 由良憲二; 鈴木 淳
平成8～10年度文部省科学研究費補助金国際学術研究研究成果報告書, Mar. 1999
Japanese

An Optimization Analysis of Pricing the Recyclable Products Collected from Consumer
K. Ren; K. Yura
Proceedings of 1998 Pacific Conference on Manufacturing, 635-640, Aug. 1998
International conference proceedings, English

How to evaluate Computer Integrated Enterprise: A Procedural Framework
A. Suzuki; K. Kattoh; L. Vlacic; K. Yura; M. Matsui; Y. Ogiwara
Proc. of PacificConference on Manufacturing, 1, 758-764, Aug. 1998
International conference proceedings, English

The Principle of Technological Innovation Accompanied by Technology Transfer
K. Hitomi; M. Nakajima; K. Yura; H. Ishikura
Proceedings of 20th International Conference on Computers & Industrial Engineering, 2, 1191, 1996
International conference proceedings, English

OPTIMIZATION ANALYSIS FOR RECYCLE-ORIENTED MANUFACTURING SYSTEMS
T HOSHINO; K YURA; K HITOMI
INTERNATIONAL JOURNAL OF PRODUCTION RESEARCH, TAYLOR & FRANCIS LTD LONDON, 33, 8, 2069-2078, Aug. 1995, Peer-reviwed, Recycling has been recently recognized as one of effective tools for solving environmental problems. In this respect present and future manufacturing systems should take the recycling of materials used into consideration. This paper points out the issues contained in such a recycle-oriented manufacturing system, then the basic parts-flow in the product's life cycle is clarified by taking account of re-use and re-production of the parts contained in the product. A model is constructed to maximize two measures of performance-total profit and recycling rate. This is solved by goal programming. Finally, a numerical example is used to demonstrate the effectiveness of the model proposed.
Scientific journal, English

STRATEGIC-PLANNING FOR CIM TO ENHANCE THE COMPETITIVE ABILITY
K YURA; K OHASHI; M NAKAJIMA; M YOSHIMURA; M OTA; K HITOMI
COMPUTERS & INDUSTRIAL ENGINEERING, PERGAMON-ELSEVIER SCIENCE LTD, 27, 1-4, 127-130, Sep. 1994, Peer-reviwed, A method of developing strategic CIM is described. Relationship between CIM and firm's competitive power is clarified, and a fundamental planning procedure for CIM is developed for enhancing the competitiveness. In the procedure, the system configuration of CIM is analyzed using 0-1 goal programming techniques. A numerical example is also demonstrated to show the effectiveness of the procedure.
Scientific journal, English

PRODUCTION SCHEDULING TO SATISFY WORKERS PREFERENCES FOR DAYS OFF AND OVERTIME UNDER DUE-DATE CONSTRAINTS
K YURA
INTERNATIONAL JOURNAL OF PRODUCTION ECONOMICS, ELSEVIER SCIENCE BV, 33, 1-3, 265-270, Jan. 1994, Peer-reviwed, A worker's satisfaction level on a production schedule is an important factor to sustain the worker's morale. An ideal production schedule for the worker accords with the worker's preferences for days off, overtime, and so on. However, production schedules may not always satisfy the worker's preferences, because the schedules must often satisfy job due dates. This paper describes a production scheduling problem which seeks to satisfy the worker's preferences under due-date constraints. A scheduling problem is considered with the objective of satisfying the worker's wishes on days off without overtime. The solution may not always satisfy all of the workers' preferences when the work loads are too heavy. Then a scheduling problem is analyzed which minimizes the total overtime necessary to satisfy all the workers' preferences. These scheduling problems are formulated as linear goal programming problems, and a numerical example is given.
Scientific journal, English

A Revised Cyclic Production Method
Kenji Yura
Transactions of the ASME Journal of Engineering for Industry, 113, 3, 328, 1991, Peer-reviwed
Scientific journal, English

Production Scheduling for a Single Machine to Minimize Orertime subject to Due Date
Kenji Yura
Proceedings of the 11th International Conference on Production Research, 1, 129, 1991
International conference proceedings, English

Multi-Job Cyclic Scheduling for an Automated Job-Shop-Type Manufacturing System(Relationship between Job Output Interval and Buffer Capacity)
Kenji Yura
JSME International Journal, SeriesIII32, 3, 498, 1989, Peer-reviwed
Scientific journal, English

循環型生産とロジスティクス
由良憲二
Oct. 2007, ロジスティクスシステム, 16, 6, 46-47, Japanese, Others

環境に対応した設計・生産技術の現状と展望
由良憲二
Jun. 2003, 自動車技術, 57, 3, 4-9, Japanese, Introduction other

ワークフォーススケジューリング
由良憲二
2001, オペレーションズリサーチ, 46, 9, 487-493, Japanese, Introduction other

ワークフォーススケジューリング
由良憲二
2001, オペレーションズリサーチ, 46, 9, 487-493, Japanese, Introduction other

Perspective of Recycling-Oriented Manufacturing System : Toward Green Manufacturing
由良憲二; 星野健; 人見勝人
1995, Factory Automation, 13, 1, 16, Japanese, Introduction other

ものづくりに役立つ経営工学の事典：１８０の知識
社)日本経営工学会編; 由良憲二
Dictionary or encycropedia, Japanese, Contributor, 第３章中の「生産システム」, 朝倉書店, 20 Jan. 2014, 9784254270228

基礎経営システム工学
松井正之; 由良憲二
Japanese, Joint work, 共立出版株式会社, Sep. 2002

生産管理用語事典
社)日本経営工学会編; 由良憲二
Dictionary or encycropedia, Japanese, Contributor, 担当用語「手順計画」，「生産スケジューリング」，「単一機械スケジューリング」，「並列機械スケジューリング」，「フローショップスケジューリング」，「ジョブショップスケジューリング」，「オープンショップ」，「サイクリックスケジューリング」，「経済ロットサイズスケジューリング」，「ワーグナーウィッティンアルゴリズム」など, 日本規格協会, Mar. 2002

日本オペレーションズ・リサーチ学会（編集発行）：OR事典, 分担執筆：基礎編，用語編
日本オペレーションズ; リサーチ学会編集; 由良憲二
Japanese, Contributor, 日本オペレーションズ・リサーチ学会, 2000

多変量統計解析法を用いた携帯電話の成長分析
Takashi Sakamoto; Kenji Yura
Oral presentation, Japanese, 日本経営工学会平成24年度秋季研究大会予稿集
Nov. 2012

Product Lifecycle Management and Advanced Distribution Systems: Analogy between Product Cycle and Water Cycle
Kenji Yura
Public symposium, Japanese, スケジューリング・シンポジウム2008, スケジューリング学会, 東京
Sep. 2008

環境配慮型プロダクトライフサイクルマネジメント
由良憲二
Others, Japanese, ミニシンポジウム「新世代計算限界と地球環境問題」, 文科省科研費補助金特定領域研究「新世代の計算限界」
Dec. 2006

Methodologies for Environment Conscious Product Lifecycle Management
Kenji Yura
Oral presentation, Japanese, Japan Society for the Study of Office Automation
Nov. 2005

Workforce Scheduling and Scheduling Systems
Kenji Yura
Oral presentation, Japanese, The Operations Research Society of Japan
Sep. 2005

生産物流スケジューリングと環境負荷に関する一考察
由良憲二
Oral presentation, Japanese, スケジューリングシンポジウム2004講演論文集
Sep. 2004

平成14年度廃棄物等処理再資源化推進調査報告書（産業用製造装置製造業におけるLCA評価手順による評価基準の調査研究等）
日本真空工業会編; 由良憲二
Others, Japanese, 平成14年度経済産業省委託業務日本真空工業会報告書
Mar. 2003

近似最適化スケジューリングアルゴリズムの性能評価
由良憲二
Others, Japanese, OR学会・日本経営工学会合同COM・SCM・スケジューリング研究部会
Mar. 2001

並列機械スケジューリングにおける近似解法による評価値の限界値について
楊 丹; 由良憲二
Oral presentation, Japanese, スケジューリング・シンポジウム'99講演論文集
Oct. 1999

マンパワースケジューリング問題
由良憲二
Oral presentation, Japanese, 日本オペレーションズ・リサーチ学会第４２回シンポジウム予稿集
1999

処理時間の不確実性を考慮した仕事の順序付け問題
由良憲二
Oral presentation, Japanese, 生産スケジューリング・シンポジウム '98講演論文集
Oct. 1998

Proposing Key Academic Researches Concerning Recycling-Oriented Industrial Systems
人見勝人; 中島勝; 大橋和正; 奥田和重; 太田雅晴; 由良憲二; 石倉弘樹
Oral presentation, Japanese, Office Automation : Special Issue on Proceedings of 35th National Conference
1997

生産システム特論
The University of Electro-Communications

オペレーションズ・リサーチ第一
The University of Electro-Communications

オペレーションズ・リサーチ基礎
The University of Electro-Communications

オペレーションズ・リサーチ第一
The University of Electro-Communications

オペレーションズ・リサーチ第一
電気通信大学

The Japan Society of Mechanical Engineers

Japan Society for the Study of Office Automation

Japan Industrial Management Association

The Institute of Systems, Control and Information Engineers

IIE

The Operations Research Society of Japan

The Japanese Society for Artificial Intelligence

Scheduling Society of Japan

Information Processing Society of Japan

Japan Society for Information and Management