• 전자공학회논문지SC
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• 제47권1호
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• pp.35-41
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• 2010

제품완성업체에서 생산성과 양품률을 향상시키기 위해서는 조립라인에서 필요로 하는 부품이 순서에 맞게 적시에 공급되어져야 하며, 이종부품의 공급으로 인한 조립라인을 멈추는 시간이 없어야 한다. 본 논문에서는 기존 바코드 기반 부품공급 시스템에서 이종부품 확인 및 서열 작업시 발생하는 수작업에 의한 불필요하게 소모되는 시간과 재사용이 불가능한 바코드 라벨 및 서열지로 인한 소모성 비용을 제거하고, RFID 기반의 부품공급 시스템이 가진 태그의 거리에 따른 인식률 저하로 인한 전송거리제한으로 발생하는 실시간 이종부품 확인 및 부품서열 관리의 어려움을 극복하는 방법으로 RFID와 USN이 융합된 형태인 스마트 파렛트기반의 직서열 부품공급 시스템을 제안하고, 간단한 구현을 통해 실현성을 입증하고자 한다.

• 산업경영시스템학회지
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• 제37권3호
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• pp.8-15
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• 2014

For zero inventory and mixed assembly production, JIT (Just In Time) production system in Toyota and JIS (Just-In-Sequence) production system in Hyundai motor co. have been proposed in automobile production areas. Even though the production systems are popular in the areas, many subcontract companies producing part-modules for final production at a parent company suffers from excessive or shortage amount of inventory due to the time gap of production and delivery to the parent company. In this study, we propose an efficient real-time assembly sequence system applying a well-known Pareto method using Paint-In information in painting process and daily production planning information. Based on this system, a production line can estimate the shortage amount of UPH (Units Per Hour) at production line and recovers the amount before operating assembly production in the line. The proposed system provides efficiency on productivity compared with the previous system.

• 대한지리학회지
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• 제42권3호
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• pp.434-452
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• 2007

경제의 글로벌화에 따른 자동차 부품산업의 구조 재편과정에서 경쟁력 강화를 위한 기업의 입지선택과 공간조직은 더욱 중요해졌다. 완성차 업체의 인수 합병으로 촉발된 부품업체의 변화는 거래선 다변화와 부품 생산의 모듈화를 중심으로 진행되었다. 이에 따른 부품업체의 입지변화와 생산조직의 공간적 특성은 다음과 같다. 첫째, 전국적인 스케일에서 보면, 수도권 남부 및 충청권 북부지역에서 부품업체의 수가 증가였고, 현대차는 수도권에서, 기아차는 동남권에서 부품공급 거래가 확대되었다. 둘째, 완성차 공장을 중심으로 보면, 전속거래업체는 완성차 공장과 근접경향을 나타내고 있으며, 복수(네트워크)거래 업체들은 분산경향을 나타내고 있다. 또한 부품공급체계에 있어서 JIT(Just In Time, 적기공급)보다 더욱 세밀해진 JIS(Just In Sequence, 동기서열공급)체계를 확인할 수 있었다. 셋째, 사례연구를 통해 부품업체의 전략적 입지선정과정을 살펴볼 수 있었으며, 완성차 업체의 외부화 경향과는 반대로 규모의 경제를 위한 내부화 경향이 현저하게 나타났다.

• 산업경영시스템학회지
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• 제32권3호
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• pp.40-48
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• 2009

In this article, scheduling of a casting sequence is studied in a casting foundry which must deliver products according to the Just-in-time(JIT) production policy of a customer. When a foundry manufactures a variety of casts with an identical alloy simultaneously, it frequently faces the task of production scheduling. An optimal casting schedule should be emphasized in order to maximize the production rate and raw material efficiency under the constraints of limited resources; melting furnaces and operation time for a casting machine. To solve this practical problem-fulfilling the objectives of casting the assigned mixed orders for the highest raw material efficiency in a way specified by the customer's JIT schedule, we implement simple integer programming. A simulation to solve a real production problem in a typical casting plant proves that the proposed method provides a feasible solution with a high accuracy for a complex, multi-variable and multi-constraint optimization problem. Employing this simple methodology, a casting foundry having an automated casting machine can produce a mixed order of casts with a maximum furnace utilization within the due date, and provide them according to their customer's JIT inventory policy.

• Journal of the Korean Data and Information Science Society
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• 제17권2호
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• pp.569-579
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• 2006

Recently, the amount of genome sequence is increasing rapidly due to advanced computational techniques and experimental tools in the biological area. Sequence comparisons are very useful operations to predict the functions of the genes or proteins. However, it takes too much time to compare long sequence data and there are many research results for fast sequence comparisons. In this paper, we propose a hybrid grid system to improve the performance of the sequence comparisons based on the LanLinux system. Compared with conventional approaches, hybrid grid is easy to construct, maintain, and manage because there is no need to install SWs for every node. As a real experiment, we constructed an orthologous database for 89 prokaryotes just in a week under hybrid grid; note that it requires 33 weeks on a single computer.

• Journal of Welding and Joining
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• 제31권3호
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• pp.54-59
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• 2013

Several methodologies analyzing welding distortions of large shell structures like ship blocks have been developed and utilized in shipyards for a long times ago. In general, one of objects of thermal distortion analysis is to find welding sequence making least-deformation without any suppliance, and it can be solved easily and rapidly by EP strain-boundary method. But after assembly construction, there are usually more than 10 weldments in each process, and the number of sequence will follow the Factorial calculation. In this research, a method has been suggested to decide the best welding sequence by minimum analysis. Using this method, welding deformation could be reduced just analyzing some cases as many as the number of weldments. Experiments and Analysis of all cases were also done, and their best results are good agreements with predictation by suggested methodology.

• 한국인터넷방송통신학회논문지
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• 제10권4호
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• pp.115-120
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• 2010

모듈화된 부품을 이용하여 완성된 제품을 만드는 제품완성업체는 효율적인 부품공급시스템을 통해 부품공급업체로부터 적시에 조립라인에 부품을 공급받기를 원하며 이종부품에 대한 결품이 발생하지 않기를 기대한다. 스마트 파렛트 기반 부품공급시스템은 이러한 요구를 만족시키기 위하여 수작업에 의한 과다한 이종부품확인 시간을 소비하는 기존의 바코드 기반 방식의 단점과 RFID 기반 방식이 가진 전송거리 제한 문제를 해결하고자 제안되었다. 본 논문에서는 스마트 파렛트 기반 부품공급시스템이 가진 제한된 전력 문제를 보완하고 운영의 효율성을 극대화하기 위한 PDA 시스템을 제안하고 실제 구현하였다.

• 전기학회논문지
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• 제59권1호
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• pp.19-25
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• 2010

Most faults are single-phase-to-ground fault in ungrounded system. The fault currents of single-phase-to-ground are much smaller than detection thresholds of measurement devices, so detecting single-phase-to-ground faults is difficult and important in ungrounded system. The protection coordination method using SGR(Selective Ground Relay) and OVGR(Overvoltage Ground Relay) is generally used in ungrounded system. But this method only detects fault line and it has the possibility of malfunction. This paper proposed to advanced protection coordination method in ungrounded system. The method just using zero-sequence current can detect fault line, fault phase, fault section at terminal device. The general protection method is used to back up protection. In the case study, the proposed method has been testified in demo system by Matlab/Simulink simulations.

• 전기학회논문지
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• 제57권7호
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• pp.1141-1149
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• 2008

Most faults are single-phase-to-ground fault in ungrounded system. The fault currents of single-phase-to-ground are much smaller than detection thresholds of measurement devices, so detecting single-phase-to-ground faults is difficult and important in ungrounded system. This paper proposed to a FI(Fault Indicator) generation algorithm in ungrounded system. The algorithm just using line-to-line voltage and zero-sequence current detects fault line, fault phase, fault section and FI(Fault Indicator) at terminal device, This paper also proposed to application plan for this algorithm. In the case study, the proposed algorithm has been testified in demo system by Matlab/Simulink simulations.

• Journal of Microbiology
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• 제33권4호
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• pp.350-354
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• 1995

Saccharomyces cervisiae has a highly ordered ring of filaments that lies just inside the cytoplasmic membrane in the region of the mother-bud neck. Mutants defective in any one of the our cell division cycle genes (CDC3, CDC10, CDC11, CDC12) fail to form these filaments and exhibit a pleiotropic phenotype that includes failure to complete cytokinesis and abnormal bud growth. However, the role of the filament is not clear. In order to find out the role of filament, the similar gene in S pombe (called cdc103$\^$+) to the CDC3 was cloned and sequenced. Here I report the sequence analysis of the cdc103$\^$+/ ) to the CDC3 was cloned and sequenced. Here I report the sequence analysis of the cdc103$\^$+/. Comparison of the predicted amino acid sequences of cdc103$\^$+/ and CDC3 revealed that they share significant similarity (43% identity and 56% identity or similarity) to each other.