Journal of Japan Industrial Management Association
Online ISSN : 2187-9079
Print ISSN : 1342-2618
ISSN-L : 1342-2618
Volume 54 , Issue 3
Showing 1-17 articles out of 17 articles from the selected issue
  • Type: Cover
    2003 Volume 54 Issue 3 Pages Cover5-
    Published: August 15, 2003
    Released: November 01, 2017
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  • Type: Cover
    2003 Volume 54 Issue 3 Pages Cover6-
    Published: August 15, 2003
    Released: November 01, 2017
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  • Type: Index
    2003 Volume 54 Issue 3 Pages Toc3-
    Published: August 15, 2003
    Released: November 01, 2017
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  • Mitsuyuki KAWAKAMI, Tomomi SHIRAI, Akiko TAIRAKU
    Type: Article
    2003 Volume 54 Issue 3 Pages 153-159
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    In recent years, with the introduction of O. A. equipment in most offices, the computer has become indispensable to enhance work efficiency. Especially, in our time, it is a surfeit of the information society. Human beings are always exposed to things that stimulate them. Under such conditions, they begin to feel both physical and emotional stress. Exceeding the stress limit can cause psychosomatic problems. So it is important to design an efficient work environment that causes a minimal burden in terms of human health. Therefore, this paper discusses design factors for a reasonable work environment regarding visual display terminal (VDT) work in consideration of the influence of work environment factors on productivity and workload. The method of research was to observe and measure the influence of number of workers and fragrance on workers involved in using VDT. The evaluation index used in this study considered productivity (quantity, quality), workload (EEG), a survey of subjective symptoms and eye fatigue. As a result of research, the number of workers (one person) and fragrances to stimulate awareness, at a 20% density, are important as reasonable work environment factors in VDT work.
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  • Katsuhiko TAKAHASHI, Nobuto NAKAMURA
    Type: Article
    2003 Volume 54 Issue 3 Pages 160-167
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    In order to realize agile control in a Just-in-Time (JIT) environment, reactive JIT ordering systems have been proposed for multi-stage production systems with unstable changes in demand. In reactive JIT ordering systems, the time series data regarding demand are monitored and unstable changes are detected by utilizing statistical control charts. The unmber of kanbans and the buffer size at each stage of the system are adjusted as a response to the detected unstable changes. The effects of adjusting the number of kanbans appear in the mean waiting of demand and mean work-in-process inventories. Both of the measures relate to the inventory level at each stage leading to the idea of utilizing inventory levels to detect unstable changes in demand and control the number of kanbans. Based on the background, this paper proposes a new reactive kanban system based on inventory levels. In the proposed system, not the time series data on demand, but the product inventory level is monitored for detecting unstable changes in demand, and the number of kanbans is adjusted as a response to the unstable changes detected. A mathematical model of the production system and the kanban system is formulated, and inventory distribution is analyzed by simulation experiments under various stable-demand conditions. Based on the results, a method of detecting unstable changes in demand and controlling the number of kanbans is proposed, and the performance of the proposed system is investigated and compared with that of the previous system by simulation experiments under unstable demand conditions.
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  • Masamitsu KIUCHI, Shinichi TAGAWA, Kazushige TAKEOKA
    Type: Article
    2003 Volume 54 Issue 3 Pages 168-175
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Today, all manufacturers have to make manufacturing lead time as short as possible. In order to make manufacturing lead time shorter, efficient master scheduling which takes the contents of orders and capacities of production systems into consideration is required. The function of master scheduling is to plan and control the flow of order from its arrival to its completion. In this study, we focus our attention to the bucket size for master scheduling. The purpose of this study is to clarify the effect of the characteristics of processing time on the optimum bucket size, and to propose a method to determine the optimum bucket size which take processing time characteristics into consideration. As the basic research of this problem, a simple model is built. The experiments are conducted by simulation. From the results of experiments, the relationship between optimum bucket size and processing time dispersion is clarified as follows. The optimum bucket size increases linearly as processing time dispersion increases. The behavior of optimum bucket size is analyzed and an estimation equation that sets the optimum bucket size considering the characteristics of processing time is deducted. It is found that this equation gives a fairly correct estimation of optimum bucket size.
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  • Masaaki OHBA, Kazutaka ARAI, Hitoshi TSUBONE
    Type: Article
    2003 Volume 54 Issue 3 Pages 176-183
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    This paper discusses the problem of a designing a production seat system with high flexibility for a combination of make-to-stock (MTS) and make-to-order (MTO) products in a film manufacturing factory. Like an airline or train booking system, customers' orders are assigned a production seat. Using the production seat system, inquiries about the delivery for individual orders can be answered quickly. This study adopts three types of flexibility coping with deviation in quantity, time, and ratio of MTO and MTS products based on a survey conducted at an actual film manufacturing factory. That is, routing flexibility, flexibility of flexible seat, and volume flexibility are adopted. First, routing flexibility enables alternative processing between manufacturing processes. Second, a flexible seat is a production seat which can interchange MTO and MTS products. Third, volume flexibility is the ability to change the total amount of output. This paper proposes how to design an effective production seat system with plural flexibility for practical application. The unfilled rate with respect to market demand for MTS products and the ratio of delivery date achievement for MTO products are used as measures of manufacturing performance.
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  • Shuhei INADA
    Type: Article
    2003 Volume 54 Issue 3 Pages 184-193
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Recently, it is becoming increasingly indispensable to optimize production management within all product manufacturing processes, including those outside the managerial view within the company. In order to reduce production costs, the effective use of outside suppliers/subcontractors should also be examined. Purchase planning, or subcontract management, is a significant issue confronting modern organizations. In such a background, this paper deals with purchase planning problems from an economic viewpoint. The solution method for determining the most economical order quantity of parts purchased from outsides manufacturers is provided. The purchase planning problem from an economic aspect is discussed utilizing cost data classified into fixed costs and variable costs. Industrial products are commonly manufactured through multiple stages, from raw materials to the final product. This research assumes that some parts including intermediate products and final products in the serial production line can be purchased from outside suppliers, and that every in-house production stage has a different production capacity. Under these assumptions, a method for determining optimal quantities of procurement parts to minimize in-house production costs is proposed. As for such purchase planning problems, a solution method utilizing the break-even point for production volume has already been provided. This method can obtain the solution when the production capacity of all in-house stages is sufficiently larger than product demand. This research extends the applicability of that method. New logic is added to solve the problem of a variety of production capacities at each stage. This expanded method can show the optimal solution for purchase planning problems according to product demand. Moreover, it can help to indicate the process margin in production stages and facilitate the effective utilization of facilities for producing other products.
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  • Jae Kyu YOO, Yoshiaki SHIMIZU
    Type: Article
    2003 Volume 54 Issue 3 Pages 194-201
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    This paper discusses a novel idea to integrate a whole production system that involves JIT (Just-In-Time) production downstream. If we apply conventional JIT technology to such a production system, it is difficult to keep production efficiency because production smoothing is not kept between processes with different production styles and production lead-times. To cope with this difficulty, we propose a new type of JIT production system in which scheduling is decided using a heuristic algorithm instead of conventional JIT production. Through computer simulations, we evaluate the proposed JIT production system regarding two cases; i. e., lot process and painting process.
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  • Masanori HORIO, Atsuo SUZUKI
    Type: Article
    2003 Volume 54 Issue 3 Pages 202-213
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    We show a new flexible algorithm of scheduling solver and its implementation. In this solver, the RCPSP (Resource Constrained Project Scheduling Problem) framework is adopted. RCPSP is known as a framework containing various scheduling problems. We especially concentrate on RCPSP/τ, in which the amount of resource consumption of activity changes during the job process. We have implemented the solver on a PC, and solved a typical scheduling benchmark problem (PSPLIB) and a practical example (school timetable generation problem of Nanzan University). We show the capability and usefulness of our solver.
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  • Type: Appendix
    2003 Volume 54 Issue 3 Pages 214-215
    Published: August 15, 2003
    Released: November 01, 2017
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  • Type: Appendix
    2003 Volume 54 Issue 3 Pages 216-
    Published: August 15, 2003
    Released: November 01, 2017
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  • Type: Appendix
    2003 Volume 54 Issue 3 Pages App11-
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (67K)
  • Type: Appendix
    2003 Volume 54 Issue 3 Pages App12-
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (67K)
  • Type: Appendix
    2003 Volume 54 Issue 3 Pages App13-
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (67K)
  • Type: Appendix
    2003 Volume 54 Issue 3 Pages App14-
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (67K)
  • Type: Appendix
    2003 Volume 54 Issue 3 Pages App15-
    Published: August 15, 2003
    Released: November 01, 2017
    JOURNALS FREE ACCESS
    Download PDF (67K)
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