• 대한안전경영과학회지
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• 제4권1호
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• pp.105-114
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• 2002

Nowadays, most companies seek after the greatest profit by means of offering the goods which consumers want timely and efficiently and minimizing the cost of inventory and distribution channel which amounts to the great portion of total cost. And according as EC(Electronic Commerce) market has increased rapidly, SCM(Supply Chain Management) for EC become one of the most important facts for companies, therefore this paper suggest SCM scheme which EC, especially B to C, is added to the existing commerce system. This paper uses internet for information integration of distribution channel which is away from one another and applies TOC(Theory of Constraint)'s DBR(Drum-Buffer-Rope) Scheduling for synchronization through the whole supply chain. It is possible to synchronize the whole supply chain by means of making the speed of manufacturing and distribution to be controlled by consumer's order which is received in distribution center, and inventory and loss of sales opportunities are minimized by constant. Buffer Management. If inventories in distribution center is short, then it needs to search CCR(Capacity Constraint Resource) in supply chain and to control the speed of manufacturing and distribution according to the ability of CCR. This paper applies PT(Partial Transshipment) strategy for Delivery from distribution center to store or cyber consumer. the strategy this paper suggests chooses neighbour area from area which each distribution center takes charge, and then makes product ordered by cyber consumer which lives in the chosen area to be delivered according to inventory of distribution center.

• 한국컴퓨터정보학회논문지
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• 제20권1호
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• pp.163-173
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• 2015

본 논문에서는 자전거 쉐어링 사업을 중심으로 창원시 누비자 자전거 쉐어링 서비스의 최적 재고 수준을 유지하며 시스템 운영비용을 최소화하는 방법을 제안한다. 쉐어링 서비스란 일반적으로 시간단위로 차량을 렌트하는 개념으로 렌터카보다 편리한 서비스로 이용자의 수가 많아지고 있는 추세이다. Vehicle sharing service는 다음 세대 차량과 함께 sustainable transportation 의 수단으로써 급부상하고 있다. 지구 온난화의 심화와 함께 이산화탄소 배출량의 감소에 관심이 집중되면서 기존의 차량의 내연 기관을 하이브리드 혹은 전기차로 변화하고 있으며, 기존의 대중교통 시스템을 다각화로 발전하고 있다. 그 중 실현 가능성이 높은 분야인 자전거 쉐어링 분야이며, 이미 지방 자치 단체 중심으로 자전거 쉐어링 사업이 이루어지고 있다. 본 연구에서는 자전거 쉐어링 서비스의 각 터미널간 최적 자전거 보유수준(S-s)을 제안하는 시뮬레이션을 설계하여 운영비용을 최소화시키는 자전거 터미널의 재고수준을 제안하였다.

• Molecules and Cells
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• 제22권3호
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• pp.323-327
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• 2006

DNA barcoding, an inventory of DNA sequences from a standardized genomic region, provides a bio-barcode for identifying and discovering species. Several recent studies suggest that the sequence diversity in a 648 bp region of the mitochondrial gene for cytochrome c oxidase I (COI) might serve as a DNA barcode for identifying animal species such as North American birds, insects and fishes. The present study tested the effectiveness of a COI barcode in discriminating Korean bird species. We determined the 5' terminus of the COI barcode for 92 species of Korean birds and found that species identification was unambiguous; the genetic differences between closely related species were, on average, 25 times higher than the differences within species. We identified only one misidentified species out of 239 specimens in a genetic resource bank, so confirming the accuracy of species identification in the banking system. We also identified two potential composite species, calling for further investigation using more samples. The finding of large COI sequence differences between species confirms the effectiveness of COI barcodes for identifying Korean bird species. To bring greater reliability to the identification of species, increased intra- and interspecies sampling, as well as supplementation of the mitochondrial barcodes with nuclear ones, is needed.

• 산업경영시스템학회지
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• 제6권8호
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• pp.49-53
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• 1983

The purpose of this study is to consider models for the production planning of multiproduct. Because these multiproducts use common facilities, labor, and materials, they are able to be considered jointly instead of planned independently. Initially linear programming models will be considered, followed by some examples of modeling and analysis when the cost structure is nonlinear. Basic model components are the following ; (1) inventory balance equations for each product to link successive time periods, and (2) capacity constraints for each period to represent resource limitations.

• 대한토목학회논문집
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• 제5권1호
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• pp.113-122
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• 1985

PERT/CPM 공정계획(工程計劃) 기법(技法)이 수많은 사업계획기법(事業計劃技法)으로 이용(利用)된지 20년(年)이 경과하였고 자원제약문제(資源制約問題)를 개선(改善)하는 방법(方法)으로도 연장(延長)되었으나 이런 방법(方法)들이 자원(資源)확보소요시간(recource acquistion lead time)과 통합(統合)하는 공정계획기법(工程計劃技法)으로 정립(定立)하지는 못하고 있다. 이 논문(論文)은 이제까지의 CPM기법(技法)이 지니지 못하고 있는 미비점(未備點)에 MRP(자재소요계획(資材所要計劃)-Material Requirements Planning)기법(技法)을 병합함으로서 계획(計劃)을 보완(補完)하고자 함에 기본목적을 둔다.

• 대한안전경영과학회지
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• 제5권2호
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• pp.145-154
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• 2003

Recently, many companies want to accept and operate ERP (Enterprise Resource Planning) system in their fields ERP does not only include business, but also include finance, account, trade, personnel and BPR(Business Process Reengineering). Especially, it is necessary to have ERP system for companies which have lots of external business such as trade and communication sector. And then, in this paper, I will think about OLTP (On-Line Transaction Processing) system for operating ERP system and improve its defects that can operate more effective sales, circulation, demand plan. But it is regrettable that I can not make a comparative analysis with other systems because the ERP system is still on the introductory stage for the company studies and the benefits have not been realized yet. Another limitation of this research is its narrow scope of study in which only the raw material inventory system for a single company is covered. In the future, however, ERP system would be adopted by many corporations, which would help us to launch a comparative study on the results of ERP system implementation as a future direction of research.

• 한국철도학회논문집
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• 제8권6호
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• pp.581-585
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• 2005

In this study, the environmental impacts of a bogie in the electric motor unit(EMU) were evaluated quantitatively using simplified life cycle assessment(S_LCA). Target was the bogie and life cycle inventory(LCI) database for the bogie was established. The software used for simplified LCA was PASS. Environmental impacts with the parts of the bogie were dependent on their weight significantly. Among impact categories, abiotic resource depletion(ARD) and global warming(GW) were shown dominantly. Global warming was occurred mainly due to the emission of CO₂released from energy consumption and abiotic resource depletion was caused mostly by the consumption of iron ore for the manufacturing of steel. Therefore, the environmental impacts of the bogie could be reduced by the light-weighting of EMU and the improvement of energy efficiency.

• 가족자원경영과 정책
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• 제10권3호
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• pp.1-21
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• 2006

The purpose of this study was to examine the variables which account for grandchildren caregivers' subjective well-being. The subjects of this research were 100 grandmothers who are currently caring for grandchildren. The instruments used for this study were 'Job Content Questionnaire' by Karasek(1979), 'Family Support Inventory for Worker' by King, Mattimore, King, & Adams(1995), 'Social Support Scale' by Park(1985) and 'Psychological Positive Functioning' by Ryff(1989). Data was analyzed by descriptive statistics, Pearson's correlations and hierarchical multiple regression. The major results of this study are as follows; First, grandchildren caregiving's demand level was negatively related to grandmothers' subjective well-being, but it's control and support level were positively related to them. Second, the variables that explained grandchildren caregivers' sutjective well-being were their marital status, income, material reward, and family support. When they had a husband, the more money they had, and with more rewards for caregiving plus family support given, the more positive subjective well-being they had.

• International Journal of Naval Architecture and Ocean Engineering
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• 제8권2호
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• pp.198-208
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• 2016

The painting process of large ships is an intense manual operation that typically comprises 9-12% of the total shipbuilding cost. Accordingly, shipbuilders need to estimate the required amount of anti-corrosive coatings and painting resources for inventory and cost control. This study aims to develop a software system which enables the shipbuilders to estimate paint area using existing 3D CAD ship structural models. The geometric information of the ships structure are extracted from the existing shipbuilding CAD/CAM system and used to create painting zones. After specifying the painting zones, users can generate the paint faces by clipping structural parts inside each zone. Finally, the paint resources may be obtained from the product of the paint areas and required paint thickness. Implementing the developed software system to real shipbuilders' operations has contributed to improved productivity, faster resource estimation, better accuracy, and fewer coating defects over their conventional manual calculation methods for painting resource estimation.

• 한국산업정보학회논문지
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• 제19권5호
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• pp.81-90
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• 2014

순방향물류와 역방향물류의 두 물류 체인을 통합해서 자원 순환형 공급체인 (CLSC: closed-loop supply chain) 을 구성하는 것은 기업의 비용절감을 위해서 반드시 필요한 요소이다. 본 연구에서는 순환형 공급체인의 환경에서 순방향물류의 도매점과 역방향물류의 처리센터의 재고를 통합하는 재고관리를 제안한다. JIT(Just-in-Time)배송이 고려된 새로운 CLSC 재고관리모델은, 회수센터에서 처리센터로 배송된 사용이 끝난 제품이 도매업자의 수요에 미치지 못할 때 제조사에게 필요한 제품을 재발주 할 것이지 사용이 끝난 제품의 회수를 기다릴 것이지를 선택함으로써 비용을 절감한다. 제안 모델의 유효성을 검증하기 위하여 최적화 기법중 하나인 유전자 알고리즘(Genetic Algorithm: GA)을 이용하였다. 파라미터가 해에 미치는 영향을 알아보기 위해서 세 가지 파라미터 조건에서 우선 순위형 GA (priority-based GA: priGA)와, 각 세대마다 파라미터가 조정되는 개량형 하이브리드 GA (modified Hybrid Genetic Algorithm: mhGA)를 사이즈가 다른 4가지 수치 예에 적용하여 시뮬레이션을 실시하였다.