• 한국연초학회지
• /
• 제24권2호
• /
• pp.88-93
• /
• 2002

This study was carried out to investigate the changes of chromatic, chemical and organoleptic characteristics of green leaf tobaccos during storage in warehouse. Eight grades(flue-cured ; A2O, B2O, C2L and D2L, burley ; A2T, B2T, C2W and D2W) of green loaves produced in 2001 were stored during 8 months(Oct. 30, 2001 to Jun. 30, 2002) in warehouse of Kimcheon(flue-cured) and Namwon(burley) Leaf Tobacco Processing factory, respectively. Moisture contents of D2L in flue-cured and four grades in burley were significantly decreased during storage in warehouse. Redness(a) values of six grades except for D2L and D2W were significantly increased during storage. Lightness(L), yellow(b) and pH values, and the contents of nicotine, total nitrogen and total sugar were not changed during storage. Irritations of flue-cured tobacco were increased, whereas tastes were decreased during storage. Irritations and tastes of burley tobacco were little changed during storage. The result suggests that the flue-cured green leaf being processed as early as possible for minimizing the deterioration of smoke taste during storage in warehouse.

• International Journal of Safety
• /
• 제5권2호
• /
• pp.29-33
• /
• 2006

A numerical flow analysis of the case of a refrigeration warehouse where an unusual death of an operator occurred by deficiency of oxygen is performed by using STAR-CD program of the computational fluid dynamics (CFD) code. The refrigeration room of the warehouse for storing the fruits maintains an atmosphere of 95% nitrogen and 5% oxygen by volume. When the operator was found dead in the refrigeration room, the room was in normal operating conditions except for the fact that the auxiliary door had been left open. For the flow analysis, unsteady 3-dimensional natural convection with mass transfer is considered. The flow analysis result is compared with the oxygen concentration level measured against time during on-site investigation. The change in oxygen concentration level in the warehouse due to the opening of the auxiliary door is found to be negligible.

• 대한산업공학회지
• /
• 제27권4호
• /
• pp.328-336
• /
• 2001

In this paper, an approach is presented for determining the required storage capacity of a warehouse with leased public space. Storage assignment policies considered are randomized and class-based storage assignment policies. An analytic model for each of the storage policies is formulated with the objective of minimizing the cost of owned storage space and leased space while satisfying a desired service level of protection against space shortages. Cost functions used in the models are piecewise liear with fixed costs. For the models, algorithms are developed to generate optimal solutions. The approach is applied to the systems where the standard economic-order-quantity inventory model is used for all items being stored in the warehouse.

• 산업경영시스템학회지
• /
• 제35권4호
• /
• pp.126-132
• /
• 2012

This paper deals with a centralized warehouse problem with multi-item and capacity constraint. The objective of this paper is to decide the number and location of centralized warehouses and determineorder quantity (Q), reorder point (r) of each centralized warehouse to minimize holding, setup, penalty, and transportation costs. Each centralized warehouse uses continuous review inventory policy and its budget is limited. A SA (Simulated Annealing) approach is developed and its performance is tested by using some computational experiments.

• 산업경영시스템학회지
• /
• 제29권2호
• /
• pp.58-66
• /
• 2006

This paper addresses the analysis of the travel distance and the number of storage location for storage location allocation methods in a warehouse system. The dedicated, randomized, combined and limited storage methods are considered. The combined and the limited storage methods are suggested here, which the combined storage method is to divide the storage locations into the dedicated storage area and the randomized storage area, and the limited storage method is to restrict the storage area of each product. Through a numerical example, the average travel distance between input/output point and the storage locations, and the number of storage location needed in the warehouse are compared between storage location allocation methods. The nearest randomized storage method is shown as the reasonable one in the travel distance and the number of storage location.

• 대한안전경영과학회:학술대회논문집
• /
• 대한안전경영과학회 2006년도 추계공동학술대회
• /
• pp.201-205
• /
• 2006

By analysis of the processes before and after applying RFID in warehouse management and the improvement the RFID system brings to warehouse management based on model of warehouse management in manufacture enterprises, a set of standard process after applying RFID system in SCM members at different phases is designed in this paper.

• Journal of Biosystems Engineering
• /
• 제5권1호
• /
• pp.33-42
• /
• 1980

This study was carried out to investigate the actual environmental paddy storage conditions in conventional Korean farm warehouses. The paddy storage conditions by the locations and sizes of warehouses were figured out. The effectiveness of the small insulated box for storing paddy was also examined. Observations were made at sixteen different warehouses located in Moonsan-Myeon, Jinyandg-gun, Gyungnam Province from July lst to September 28 th, the period which was considered to be the worst for storing grains. The results are as follows ; 1. the average temperatures of rough rice and air inside the warehouse were 0.9 and 0.7$^\circ$ higher than the outside air temperature. 2. The average relative humidity in warehouses was 1.5percent higher than that of the atomosphere. This fact resulted in the increased moisture content of grains. Therefore, the ventilation for equalizing the relative humidity of inside and outside of warehouses was required. 3. The dry matter of stored rough rice was decreased by 1.1 percent in average druing the observation period. In order to reduce the dry matter loss, application of new grain storing method ;hermetic storage or filling inert gas storage, was highly recommended. 4. Environmental conditions for storing rough rice in a warehouse located in a sloping site are, in general , better than those of a warehouse located in a flat site. But as far as the dry matter of rough rice was concerned, above situation is not always satisfactory. Because it is fairly frequent to observe the higher rate of moisture absorption by grains stored in a warehouse located in a sloping site. 5. Environmental conditions for storing rough rice in a large-scale warehouse were better than those in a small size warehouse. Therefore, it is advisible for farmers to store their grins in the large-scale warehouses commonly used by villagers. 6. It was undesirable to store rough in a insulated box.

• 한국통신학회논문지
• /
• 제25권8A호
• /
• pp.1265-1272
• /
• 2000

데이터 웨어하우스는 사용자의 의사 결정에 필요한 정보를 제공하여 효율적인 데이터 마이닝 질의 처리 및 그에 대한 응답을 이루도록 한다. 이를 위해서 데이터 웨어하우스는 소스 데이터로부터 유도된 실체 뷰를 저장하고 있다 특히 소스 데이터가 단일 소스 환경에서 잘 알려진 보상 알고리즘을 들수 있다 보상 알고리즘에서는 질의 평가 결과를 얻기 위해서 뷰와 관련된 갱신 발생이 많을수록 웨어하우스의 복잡성과 메시지 양이 증가하며 웨어하우스 내에 질의 관리 오보헤드가 발생되는 문제점이 있었다 본논문에서는 뷰유지를 위한 질의 관리 오버헤드를 감소시키며 정확성을 향상시킨 알고리즘을 제시한다 또한 메시지 전송과 데이터 전송 측면에서 제시 하고 있는 알고리즘을 보상 알고리즘 및 재 계산 알고리즘과 성능을 분석 비교하였다.

• 정보처리학회논문지B
• /
• 제13B권5호
• /
• pp.507-514
• /
• 2006

유비쿼터스 컴퓨팅의 일환으로 무선인식(RFID)을 이용한 많은 응용시스템이 개발되고 있으며, 특히 물류산업에 RFID 칩이 널리 보급될 것으로 예측된다 중소업체의 경우 소규모 창고관리에도 비용과 인력 측면에서 어려움을 격고 있는 상황에서 효율적이고 정확한 지능형 창고관리 시스템의 필요성이 절실하다. 본 논문에서는 로그기반 상황인식 기술을 이용하여 소규모 창고관리시스템을 구현한다. RFID 리더기를 제어하는 클라이언트를 구성하고 서버에 DBMS 시스템을 구축하여 웹상에서 운영되는 창고관리시스템을 구현한다. 특히, 시스템 접근 이력에 대한 로그데이터를 토대로 사용자의 입출고 의도를 파악하며, 관리자에게 사용자의 비정규적인 창고사용 패턴을 보고하고 예측 가능한 재고관리 서비스를 제공한다. 결과적으로, 제안한 시스템은 소규모 창고관리의 효율성과 정확도를 향상시키는데 기여할 수 있다.

• 한국전자통신학회논문지
• /
• 제8권12호
• /
• pp.1803-1810
• /
• 2013

물류창고 시스템에서는 물류의 입고/출고에 따른 재고현황의 변동이 잦고, 내용물에 따라 주위환경요소가 큰 영향을 미칠 수 있으므로, 재고현황 및 환경요소를 빠르고 정확하게 관리하는 것이 물류관리에 있어서 매우 중요하다. 하지만 현재 제안되고 있는 RFID 기반의 물류관리 시스템은 RFID 리더 간 통신에 대해 통일된 국제규격이 없고, 일반적으로 사용되는 중앙집중방식 MAC 방식의 경우 클러스터 헤더의 이동이나 채널 상황의 영향으로 인해 이 시간동안 각 노드 간 통신이 불가능하다. 따라서 본 논문에서는 채널 상황에 능동적으로 대처할 수 있는 물리계층 정보를 이용한 와이미디어 MAC 프로토콜 기반의 릴레이 협력통신 방안에 대한 결과를 제안한다.