• International Journal of Quality Innovation
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• v.10 no.1
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• pp.107-113
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• 2009

Our goal of this study is to confirm whether manufacturing companies' practicing JIT production system have positive effect on production performances and to confirm that manufacturing companies' practicing SPC shows positive moderate effect on the relation between practicing JIT and their production performances. Based on empirical study to manufacturing companies nationwide, we can conclude that taking JIT practices of sample companies has positive effect on production performances and, moreover, practicing SPC has positive moderate effect on the relation between JIT practices and production performances. These conclusion represents managerial implication that concurrent practicing JIT and SPC could generate more improved production performances.

• Journal of the Korea Society of Computer and Information
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• v.3 no.1
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• pp.113-124
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• 1998

This paper has simulated JIT production system. One of the well-known production management system, JIT, was first developed in Toyota in Japan during 1970's. Its contribution to productivity and quality improvement seemingly predicts its wider use. The JIT system has been proved its effectiveness lot production management system by many industries, however the effectiveness of its application in non-repetitive productions is yet uncertain. In this respect, this paper develope the JIT simulation model, and this JIT model are evaluated by using a SIMAN simulation. It has proved that the performances of JIT model are excellent.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.25 no.4
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• pp.69-78
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• 2002

The basic purpose of the JIT(Just In Time) production system is to increase profits by reducing costs-that is, by completely eliminating waste such as excessive stocks or workforce. To achieve cost reduction, Production must promptly and flexibly adapt to changes in market demand without having wasteful slacks. :iuch an ideal is accomplished by the concept of JIT, producing the necessary items in the necessary quantities at the necessary time. The JIT production system is supported by the following: reduction of setup time, smoothing of production, standardization of jobs, improvement activities, design of machine layout, Kanban system, autonomation etc. This study examined the present state of the domestic JIT production system and introduced the empirical case of JIT application a small and medium manufacturing company. A synthetic resins manufacturing company applied JIT principles to its processes and achieved the great performance.

• 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.

• Journal of the Korea Safety Management & Science
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• v.3 no.3
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• pp.87-95
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• 2001

In Production system, there are two ; One is the JIT system, which was developed by the Toyota corporation : the other is the MRP system, which was developed in the United States. The JIT system has been proved its effectiveness for production management system by many industries, however the effectiveness of its application in non-repetitive productions is yet uncertain unlike the MRP system. There has been many efforts in comparing and analyzing the usefulness and the limitation of those production systems. Accordingly, this study has focused its simulation model using MRP and JIT.

• Proceedings of the Safety Management and Science Conference
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• 2001.05a
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• pp.185-188
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• 2001

Many production management systems for increasing productivity, minimizing inventory, keeping due dates and maximizing use of resources have been proposed, and GT, MRP and JIT are frequently used among these systems. The three systems have merits and demerits through comparing with each other. Because each system has mutual dependence, a hybrid production system is necessary for using their merits maximally. In this study, a hybrid production system is designed by combining GT, MRP and JIT, which is suitable in the domestic production system.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.20 no.42
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• pp.131-141
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• 1997

The purpose of this study is to certify the actual state of JIT(Just-in-Time) production system's implementation of Korean manufacturing industries and to exhibit the appropriate JIT system considering the company's characteristics, for attain the superior competitiveness. To understand the current situations of JIT system's implementation a questionnaire study is performed. Total 152 valid questionnaires are collected by personal visit and mailing method. All the data is statistically analyzed by SPSS PC+ and SAS program and reviewed to develop a strategy for JIT implementation of Korean manufacturing companies.

• Journal of the Korea Safety Management & Science
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• v.3 no.1
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• pp.93-105
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• 2001

Many production management systems for increasing productivity, minimizing inventory, keeping due dates and maximizing use of resources have been proposed, and GT, MRP and JIT are frequently used among these systems. The three systems have merits and demerits through comparing with each other. Because each system has mutual dependence, a hybrid production system Is necessary for using their merits maximally. In this study, a hybrid production system is designed by combining GT, MRP and JIT, which is suitable in the domestic production system and it is presented as followings. -. Basic research works for G7, MRP and JIT. -. Comparison and analysis are carried out for each system.- . The hybrid production system is designed. -. The hybrid production system is developed.

• IE interfaces
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• v.7 no.3
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• pp.39-51
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• 1994

A CIM implementation case is introduced in this paper. It is accomplished through the integration of two fundamental approaches to production planning and control; JIT and MRP. The resultant system is a hybrid where some JIT methodologies prevail, but the benefits of the MRP are also required. A new BOM structure called 'Family-BOM' is designed for the load leveled production with small lot size and the synchronized production. The overall production planning concept is described with actual data.

• Journal of Korean Institute of Industrial Engineers
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• v.23 no.2
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• pp.403-420
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• 1997

In this paper, we examine the effect of production uncertainty to production control policies. First, we examine two famous production control policies, namely, MRP and JIT from the view point of shop floor control perspective, and analyze the differences between them due to demand fluctuations and activity time variations. Second, we conduct simulation studies on MRP and JIT to draw out the effects of demand fluctuations and activity time variations. Demand fluctuations are further classified into demand lumpiness and demand irregularity. And, activity time variations are further classified into stationary time variations and non-stationary time variations. Experimental results show that, in terms of demand fluctuations, MRP is affected by demand lumpiness, but JIT by demand irregularity. And we also see that both MRP and JIT are influenced by stationary time variation with respect to activity time variations.