• Title/Summary/Keyword: just-in-time production system

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A Case Study on Application of Dispatching Rule-Based Advanced Planning and Scheduling (APS) System (디스패칭 룰 기반의 Advanced Planning and Scheduling (APS) 시스템 활용 사례연구)

  • Lee, Jae-yong;Shin, Moonsoo
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.38 no.3
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    • pp.78-86
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    • 2015
  • Up-to-date business environment for manufacturers is very complex and rapidly changing. In other words, companies are facing a variety of changes, such as diversifying customer requirements, shortening product life cycles, and switching to small quantity batch production. In this situation, the companies are introducing the concept of JIT (just-in-time) to solve the problem of on-time production and on-time delivery for survival. Though many companies have introduced ERP (enterprise resource planning) systems and MRP (material requirement planning) systems, the performance of these systems seems to fall short of expectations. In this paper, the case study on introducing an APS (advanced planning and scheduling) system based on dispatching rules to a machining company and on finding a method to establish an efficient production schedule is presented. The case company has trouble creating an effective production plan and schedule, even though it is equipped with an MRP-based ERP system. The APS system is applied to CNC (computer numerical control) machines, which are key machines of the case company. The overall progress of this research is as follows. First, we collect and analyze the master data on individual products and processes of the case company in order to build a production scheduling model. Second, we perform a pre-allocation simulation based on dispatching rules in order to calculate the priority of each order. Third, we perform a set of production simulations applying the priority value in order to evaluate production lead time and tardiness of pre-defined dispatching rules. Finally, we select the optimal dispatching rule suitable for work situation of the case company. As a result, an improved production schedule leads to an increase in production and reduced production lead time.

Development of Production Information System for An Auto-parts Industry (자동차 부품 업체를 위한 생산정보시스템의 개발 사례)

  • So, Y.S.;Jeong, B.H.;Heo, E.Y.;Lee, H.Y.;Jo, Y.H.;Kim, J.S.
    • IE interfaces
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    • v.9 no.2
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    • pp.159-171
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    • 1996
  • In recent, most'of automobile industries adopt the concept of JIT production. According to the concept, the paternal manufacturers require their suppliers to supply parts just in time, so it is very important for a subcontractor to produce the parts in the appointed time of delivery. This study develops a production information system for Woosin Industry, which is one of such subcontractors of Hyundai Motors Company(HMC). The system is developed for use in Client/Server environment. In this study, the following three modules are developed, i. e., the production scheduling module, the sales management module to deal with the information about orders of HMC, delivery of parts, and bill collecting, and the module for supporting material requirements planning and purchase of material.

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JIT Production System of Domestic Manufacturers and It's Impact on Manufacturing Performance (국내 제조기업의 JIT생산방식의 도입과 제조성과에 관한 연구)

  • Kim Dae-Hong;Kim Sang-Bin
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.28 no.1
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    • pp.64-71
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    • 2005
  • The purpose of this study is to propose guidelines for introducing the Just-In-Time (JIT) production system to enhance the competitiveness of Korean manufacturing companies. This study employed an extensive survey on the use of the JIT production systems among different korean manufacturing companies to understand the current status of the JIT production system in use and to identify the benefits from implementing JIT production system. The survey has covered 170 manufacturing companies of different sizes from various sectors of Korean industries including electronics, automobiles, machineries, and textiles. In conclusion, our research results support that the JIT production system would contribute to increase the manufacturing performances of Korean manufacturing companies through lower inventory level and increased quality level.

A Study on Realization of Continuous Flow Production and Flexible Workforce Using JIT Subsystem (흐름생산과 소인화의 실현을 위한 JIT하위 시스템의 운영)

  • 구일섭;신현균
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.16 no.28
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    • pp.49-58
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    • 1993
  • We have been recognize the adaptation of JIT(Just-in-Time) production system is necessary to improve the constitution of enterprises. But this system is not settled in our industrial environment owing to misunderstanding of JIT concepts and lack of participation all members of the oranization. This paper deals with systematic application of the JIT subsystems such as U-form layout, flexible workforces with multi- functional skilled workers and adjustment of standard operations procedures. And a successful productivity improvement case study of a small and medium sized industry was dealt.

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Sequencing for a mixed model assembly line in just-in-time production system (JIT 상황하에서 다품종 조립라인 작업물 투입 순서 결정 방안)

  • Hwang, Hark;Jeong, In-Jae;Lim, Joon-Mook
    • Korean Management Science Review
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    • v.11 no.1
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    • pp.91-106
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    • 1994
  • In mixed model assembly lines, products are assembled seqeuntially that have different combination of options specified by customers. In just in time (JIT) environment, production smoothing becomes an important issue for sub-lines which supply the necessary parts to each workstation of the assembly line. Another important issue is to avoid line stopping caused by work overload in workstations. To find a sequence which minimizes the costs associated with line stoppage and the option parts inventory level, a nonlinear mixed integer programming is formulated. Recognizing the limit of the Branch and Bound technique in large sized problems, a heuristic solution procedure is proposed. The performance of the heuristic is compared with the Branch and Bound technique through randomly generated test problems. The computational results indicate that on the average the heuristic solutions deviate approximately 3.6% from the optimal solutions.

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Sequencing for Mixed-model Assembly Lines Considering Part Supplier in Just-in-time Production Systems (JIT생산시스템에서 부품공급업자를 고려한 혼합조립순서결정에 관한 연구)

  • 남궁석;이상용
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.20 no.43
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    • pp.1-16
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    • 1997
  • This paper improves the autonomy for supplier's schedule and the flexibility of the final assembly line. The final assembly line is a single work station and each product taking different assembly time is considered. In the assembly schedule, the heuristic method based on the goal chasing method is used. Consequently, suppliers can independently determine their output rates and thus, change their workload pattern according to their needs and priorities. Moreover, this flexibility can help to avoid expensive final-assembly-line stoppages in case of sudden part supply disruptions. The sequencing method can be easily implemented into an existing just-in-time system. In addition, the mathematical model was formulated and the algorithm was explained through the flow chart. The numerical example was given and the efficiency of this method is shown through the analysis of computational results of that example.

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An Empirical Study about Assessment of the JIT System: on korean semi-production firm

  • Lee, Eung-Kweon
    • International Commerce and Information Review
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    • v.7 no.2
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    • pp.75-94
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    • 2005
  • This study is focused on evaluating the computer-integrated just-in-time (CI-JIT) production system of a semi-conductor manufacturing firm in Korea. Approaching the mid-1980s, the emphasis was on low price, low-cost operations, and quality, especially in USA. American companies have shifted output to low-wage countries like the Philippines, Korea, Japan, Malaysia and allied countries that can make quality products at low prices. Korea and other Asian countries forego short-term profits to gain a solid foothold in a product market, recognizing that larger market share leads to lower cost and higher profit in the long run. They bring manufacturers and suppliers together to improve material management and operation management, using project teams that investigate topics, such as Just-In-Time(JIT)manufacturing, among others. The "Kanban" word means "card" in Japanese, and is used to indicate the desired final delivery schedule. The operation for a particular item produced is scheduled for a specific time. The same process is extended to the external suppliers. More recently, the cards are gradually being replaced by electronic procedures that follow the same concept. Its capacity must be capable of handling the various transactions required by the JIT coverage as well as some allowances for expanded applications.

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A Study on the Effect of Setup Time Reduction on Production Lot Sizes (생산준비시간 단축과 생산로트사이즈에 대한 연구)

  • 구일섭;김진수
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.17 no.32
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    • pp.121-126
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    • 1994
  • Setup Time Reduction is an important aspect of the Just-in-Time(JIT) and Zero Inventory(Zl) Concepts since it supports reductions in manufacturing lead times and inventories. It also enables small lot sizes and kanban systems implementation for material flow - achieving major improvements in production floor management. One concept fundamental to the pursuit of JIT production in Japan and other countries is adoption of a setup time reduction. This paper looks at the necessities of setup time reduction and the relations to machine utilization. By using an EOQ model for evaluate the effect of setup time reduction, we get the results that over 75 % reduction in setup time is obtain the desired results in the lot size reduction.

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A Conceptual Model Study For J.I.T(Just In Time) Construction Managemaent On High-rise Building-Concerned On Resource Life Cycle Of Concrete Construction- (고층건축공사 적시생산을 위한 관리모델 사례 -콘크리트 자재의 Life Cycle을 중심으로-)

  • Song Young-Suk;Lim Hyung-Chul;Choi Yun-Ki
    • Korean Journal of Construction Engineering and Management
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    • v.2 no.4 s.8
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    • pp.127-134
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    • 2001
  • Effectiveness of Just in time managing system can be obtained by removing unexpected lead-time and maintaining consistency on the physical transportation of construction resource. Construction resource management is essential on checking on load data from production of shop to field, and it is based on building resource life cycle information. In this study, production, transportation, and assembly disciplines of concrete construction should real time communications exchanging information related to shop-field with each other, Establishing information support system is an important initial step for promoting active cooperations among these resource life cycle on data flow. To achieve this, on suitable using management point, we suggest a concrete construction control model.

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A Simulation Analysis of JIT System with Uncertainty Situation (불안정한 생산환경하에서의 시뮬레이션에 의한 JIT시스템 수행도 평가)

  • 박성미;남상진;김정자
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.17 no.32
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    • pp.155-162
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    • 1994
  • The Japanese "Just-In-Time" technique reduces inventory and unnecessary factors. This technique makes the success of Japanese firms, therefore many Korean firms try to apply it to their situation. But the technique doesn't bare the same success in Korean firms. This paper, therefore, considers the different situations between Korean rim and Japanese firm, then simulates the Pull system and Push system for a multiline, multistage production system. This paper drives the different results of simulation according to variable processing times, variable demand, set-up time and shortages in Pull system and Push system using GPSS. The results show that the performance of Pull system is lower than Push system's in variable master production scheduling and variable processing times.ing times.

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