• 한국산학경영학회:학술대회논문집
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• 한국산학경영학회 2005년도 추계학술발표대회 발표논문집
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• pp.29-46
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• 2005

최근에 국내에서 TPS(Toyota Production System)에 대해 기업이나 제조업 관련 사람들에게 많은 관심을 불러일으키고 있다. TPS는 일본형 생산시스템의 대표적 모델이며, 21세기 후반 생산기술 분야에 많은 기여를 하고 있으며 그 성과 역시 높은 평가를 세계 여러 기업으로부터 받고 있다. 본 연구에서는 TPS의 기본 개념과 특성 그리고 적용 절차 등 TPS의 현재 모습을 통해 기존의 TPS가 안고 있는 문제점과 한계를 조명하고자한다. 이를 통해 현재의 TPS를 앞으로도 지속적으로 적용하고 경쟁력 있는 시스템으로 발전시키기 위한 방안으로 NEW JIT 기법을 활용하고자한다. NEW JIT는 고객제일의 품질관리를 목표로 판매, 개발 그리고 생산의 각 부분의 업무프로세스를 혁신하는 것이다. 하드웨어 시스템으로는 TMS, TDS, TPS로 구성되며, 소프트웨어 시스템은 과학적 SQC(TQM-S)를 이용한 TQM의 전개로 이루어진다. 따라서 앞으로 차세대 제조관리기술을 위해 NEW JIT 기법을 보다 더 우리의 기업환경에 적합하도록 활용할 수 있는지를 검토하고 연구 발전시켜야 한다.

• 산학경영연구
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• 제19권1호
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• pp.93-114
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• 2006

최근에 국내에서 TPS(Toyota Production System)에 대해 기업이나 제조업 관련 사람들에게 많은 관심을 불러 일으키고 있다. TPS는 일본형 생산시스템의 대표적 모델이며, 21세기 후반 생산기술 분야에 많은 기여를 하고 있으며 그 성과 역시 높은 평가를 세계 여러 기업으로부터 받고 있다. 본 연구에서는 TPS의 기본 개념과 특성 그리고 적용 절차 등 TPS의 현재 모습을 통해 기존의 TPS가 안고 있는 문제점과 한계를 조명하고자 한다. 이를 통해 현재의 TPS를 앞으로도 지속적으로 적용하고 경쟁력 있는 시스템으로 발전시키기 위한 방안으로 NEW JIT 기법을 활용하고자 한다. NEW JIT는 고객제일의 품질관리를 목표로 판매, 개발 그리고 생산의 각 부분의 업무프로세스를 혁신하는 것이다. 하드웨어 시스템으로는 TMS, TDS, TPS로 구성되며, 소프트웨어 시스템은 과학적 SQC(TQM-S)를 이용한 TQM의 전개로 이루어진다. 따라서 앞으로 차세대 제조관리기술을 위해 NEW JIT 기법을 보다 더 우리의 기업환경에 적합하도록 활용할 수 있는지를 검토하고 연구 발전시켜야 한다.

• 대한산업공학회지
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• 제17권1호
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• pp.83-94
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• 1991

This study is concerned with the scheduling problem for mixed-model assembly lines in Just-In-Time(JIT) production systems. The most important goal of the scheduling for the mixed-model assembly line in JIT production systems is to keep a constant rate of usage for every part used by the systems. In this study, we develop two heuristic algorithms able to keep a constant rate of usage for every part used by the systems in the single-level and the multi-level. In the single-level, the new algorithm generates sequence schedule by backward tracking and prevents the destruction of sequence schedule which is the weakest point of Miltenburg's algorithms. The new algorithm gives better results in total variations than the Miltenburg's algorithms. In the multi-level, the new algorithm extends the concept of the single-level algorithm and shows more efficient results in total variations than Miltenburg and Sinnamon's algorithms.

• 산업공학
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• 제7권3호
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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.

• IEIE Transactions on Smart Processing and Computing
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• 제4권3호
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• pp.169-172
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• 2015

Dalvik is a virtual machine (VM) that is designed to run Java-based Android applications. A trace-based just-in-time (JIT) compilation technique is currently employed to improve performance of the Dalvik VM. However, due to runtime compilation overhead, the trace-based JIT compiler provides only a few simple optimizations. Moreover, because each trace contains only a few instructions, the trace-based JIT compiler inherently exploits fewer optimization and parallelization opportunities than a method-based JIT compiler that compiles method-by-method. So we propose a new method-based JIT compiler, named DEX2C, in order to improve performance by finding more opportunities for both optimization and parallelization in Android applications. We employ C code as an intermediate product in order to find more optimization opportunities by using the GNU C Compiler (GCC), and we will detect parallelism by using the Intel C/C++ parallel compiler and the AESOP compiler in our future work. In this paper, we introduce our DEX2C compiler, which dynamically translates Dalvik bytecodes (DEX) into C code with method granularity. We also describe a new method-based JIT interface in the Dalvik VM for the DEX2C compiler. Our experiment results show that our compiler and its interface achieve significant performance improvement by up to 15.2 times and 3.7 times on average, in Element Benchmark, and up to 2.8 times for FFT in Smartbench.

• 한국압력기기공학회 논문집
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• 제9권1호
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• pp.31-34
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• 2013

According to the increase in numbers and operation time of domestic Nuclear Power Plants, KHNP(Korea Hydro & Nuclear Power) has many operating experiences. These show that most of the accidents repeatedly occurred not by the new sources or mechanism like the Fukushima Accident, but by the human and equipment errors from normal habits, process, design, maintenance etc.. These lessons show that the well-established systematic approach is requested to take lessons from past experiences. For this reason, developed countries established INPO, WANO, COG as a non-profit professional organizations to actively share their operating experiences. KHNP is also trying to promote the utilization of operating experiences. As part of this effort, KHNP is developing the KHNP-JIT, reflecting the overseas JIT and the domestic experiences.

• 산업경영시스템학회지
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• 제21권48호
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• pp.241-251
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• 1998

The purpose of this study is to evaluate the relative importance of seven JIT operational techniques in Domestic industries. These techniques are used to improve manufacturing effectiveness and efficiency such as : Setup time reduction, Kanban, Multi-functional worker, U type layout, Andon(line stop), Atonomation, and Smoothing production. The new analytic hierarchy process(AHP) model is used in order to evaluate the relative importance of the seven JIT operational techniques which are used to increase the manufacturing effectiveness and efficiency. To aggregate the multi-divisions priorities, in this paper, we suggest a way which decision maker can exclude outlier matrix from group by using the concept of the compatibility in AHP.

• 대한안전경영과학회:학술대회논문집
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• 대한안전경영과학회 2004년도 추계학술대회
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• pp.47-51
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• 2004

Facility layout for enterprise's competitive power strengthening and construction of offensive manufacture line and direction presentation for design of production management system that is new by operation improvement according to S company. In enterprise in JIT(Just in Time) system of leading persons affecting in productions among a lot of habitat factor analyze. It is that through equipment Layout among those factors enterprise my problem improve and serves enterprise's absolute ability cultivation. Even if it is JIT production main point that affect to apply the modular production to productive system among at equipment Layout, lot size, bottleneck session etc. worker's multi-function anger, change of demand factor and productive capacity add. 'S' Through enterprise's example, I wish to establish Korean medium and small enterprises' manufacturing industry style equipment Layout model by taken place effect interpretation.

• 한국산학기술학회논문지
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• 제7권2호
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• pp.251-256
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• 2006

본 논문은 다단계, 다품종 조립라인을 고려한 모델이며 JIT 생산시스템에서의 최적의 발주량 계산을 목적으로 하고 있다. 제안 모델의 목적함수는 재고비와 setup 비의 합이 최소화되도록 설계되어 있다. 이는 대부분의 자동차 부품회사의 경우 setup 공정을 포함하고 있기 때문이다. 마지막으로 수치실험을 통해 제안 모델의 유효성을 보여 주고 있다.

• 대한산업공학회지
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• 제34권1호
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• pp.1-12
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• 2008

The Kanban system in Just-In-Time (JIT) production is very effective in reducing the inventories when consumption rate of the final product is relatively stable. When large fluctuations exist in the consumption rate, a new production ordering policy in which the production order quantity is determined by smoothing the demands exponentially is more suitable. This new ordering policy has not been investigated sufficiently. In this research, a multi-stage production and inventory system with stock points for materials and finished items located at each stage is considered. Approximations of average inventories at each stage in the system are derived theoretically. Numerical simulations are carried out to assess the accuracy of approximations and to evaluate the effectiveness of the new ordering policy as compared with the Kanban system. As a result, it is shown that the new ordering policy can achieve significantly lower inventory costs than the original Kanban system. The new ordering policy thus emerges as a key concept for an effective supply chain management.