• 산업경영시스템학회지
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• 제18권35호
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• pp.89-94
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• 1995

Previous MRP models were developed without considering learning effects on the determination of the production lot size environment. The only consideration was the setup and inventory holding costs. In this paper the proposed MRP model were developed incorporated the effects of learning. The result of this model show that learning significantly influence the production lot size and total variable cost. The numerical examples have been used to illustrated the impact of proposed model.

• 산업경영시스템학회지
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• 제12권19호
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• pp.79-88
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• 1989

This characteristics of process industries are high capital intensity, relatively long and sequence dependent setup times, and extremely limited capacity resources. The lot sizing, sequencing and limited capacity resources factors must he considered for production scheduling in these industries. This paper presents a mixed integer programming model for production scheduling. The economic trade offs between capacitated lot sizing flow shop scheduling and sequence dependent setup times also be compared with SMITH-DANIELS's model. As a results, it is shown that this paper has lower total cost, more efficient throughput than SMITH-DANIELS's model.

• 한국산업정보학회논문지
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• 제24권4호
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• pp.29-36
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• 2019

본 논문은 주차장에서 운전자의 다양한 선호도를 고려하여 실시간으로 주차 가능한 주차면을 안내하는 방안을 제안한다. 본 시스템은 주차장 진입 시부터 사용자가 유휴 주차면에 주차할 때까지, 각 주요 지점에서 차량을 검지함으로써 각 경로상 교통상황을 활용하고, 각 주차 구역 내의 주차 가능 주차면 및 목적지 근접도 등의 사용자 선호도에 가장 적합한 유휴 주차면을 실시간으로 탐색하여 각 안내 지점에서 최적의 경로를 안내한다. 이를 위하여 본 논문은 최적경로 안내를 위한 다양한 사용자 선호도 기반의 비용 함수를 제안하고 본 시스템의 가능성을 평가하기 위해 이벤트 기반 시뮬레이터를 설계하고 구현한 결과를 제시한다.

• 한국콘텐츠학회논문지
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• 제9권2호
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• pp.439-445
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• 2009

본 연구는 도시설계 및 도시개발 사업시에 사용되는 입체환지사업 전후에 관련된 구조를 설명하고 이를 향후 지리정보시스템(GIS) 구축시에 용이하게 계산할 수 있는 수리적 관계를 정립하고자 하는 것이 그 목적이다. 수리적 분석의 결과, 입체환지에 따른 공급연상면적은 다양한 독립변수에 영향을 받는데 그 중 현재의 지가, 사업전후의 지가상승률, 감보율, 용적률이 주요한 변수임이 확인되었다. 이들 중에서 현재의 지가와 지가상승률은 인위적으로 결정할 수 있는 부분이 아닌 반면, 감보율과 용적률은 인위적인 조정이 가능한 부분이다. 이는 향후 개발되는 의사결정시스템의 중심 기능으로 활용 가능한 수리적 해석으로서, 토지소유자 혹은 조합과의 합의 도출 그리고 시행자측의 사업성을 판단하는 근거를 확보할 수 있게 된다. 그 과정과 결과를 놓고 관청, 주민 등의 이해 당사자들과 사업 추진 관련한 논의를 진행할 수 있는 객관적인 근거로 활용될 수 있을 것이다.

• 한국화재소방학회논문지
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• 제30권6호
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• pp.1-8
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• 2016

유가의 상승과 환경의 문제로 차량중량의 감소에 의한 차량연비를 개선하기 위하여 가연물인 플라스틱과 직물 등의 사용이 획기적으로 증대되어 주차장에서 화재가 발생하면 2000년대 중반 이전에는 한 두 대가 연소되고 마는 것과는 달리 주차된 차량 전체가 연소하는 화재가 많이 발생하였다. 본 연구에서 차량에 사용되는 플라스틱 등 가연물의 량을 확인한 결과 한 대에 316.2 kg으로 차량 전체무게 1935 kg 대비 16.34%가 되어 과거대비 10배 이상의 증가가 있었다. 또한 주차장의 소화설비로 스프링클러를 설치 시 물분무설비의 원래 성능대로 살수밀도를 $20lpm/m^2$를 사용할 것과 필로티 주차장에 호스릴이산화탄소소화설비 대신 적응성이 있는 포, 분말, 강화액 설비를 사용할 것을 요구하였다.

• 품질경영학회지
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• 제16권2호
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• pp.92-98
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• 1988

In this paper a model is developed for an inventory system in which the number of units of acceptable quality in a replenishment lot is uncertain and the demand. during the stockout period is back ordered and. also under the same condition an inventory model with experdited stockout is developed. It is assumed that the fraction of the acceptable quality in a replenishment lot is a random variable whose probability distribution is known. The optimal replenishment policy is synthesized for such a system. A numerical example is used to illustrate the theory.

• 지능정보연구
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• 제2권1호
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• pp.93-107
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• 1996

A flexible flow line(FFL) consists of several groups of identical machines. All work-orders flow along the same path through successive machine groups. Thus, we emphasized the balancing of workloads between machine groups in order to maximize total productivity. On the other hand, many different types of work-orders, in varying batch or lot sizes, are produced simultaneously. The mix of work-orders, their lot sizes, and the sequence in which they are produced affect the amount of workload. However, the work-orders and their lot sizes are prefixed and cannot be changed. Because of these reasons, we have developed an optimal route selection model using heuristic search and Min-Max algorithm for balancing the workload between machine groups in the FFL.

• 대한산업공학회지
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• 제40권4호
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• pp.424-427
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• 2014

In this paper, we consider a production system in which the items are produced by batch. For a production planning of the system, we formulate a lot-sizing problem in which each production should be a multiple of a given unit batch and backlogging is allowed. We propose an optimal dynamic programming algorithm for the plan whose complexity is $O(T^2)$ where T is the maximum number of periods in a plan.

• The Journal of Asian Finance, Economics and Business
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• 제2권3호
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• pp.33-36
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• 2015

Innovations in the procurement logistics now is very popular in Kazakhstan. Nowadays there are a lot of documents of transport infrastructure and Kazakhstan logistic system is developing more and more. Procurement logistic is the direction where you can count, sometimes you can buy some products or transport equipments. Logistic in Kazakhstan is new direction, there are a lot of young people who choose this specialty and will stay demanded. Our president said a lot of words in strategies about development in logistics and so there will be new methods that will be used here. Innovations are new technologies that are used in different spheres so this structure as procurement logistic will develop in Kazakhstan and every citizen of our republic will support it. Transport systems are used for transitions different products so there are a lot new transition roads for example Western China - Western Europe; Astana-Almaty; Astana-Ust-Kamenogorsk; Astana-Aktobe, Atyrau; Almaty - Ust-Kamenogorsk; Karaganda - Zhezkazgan - Kyzylorda; Atyrau-Astrakhan, it helps Kazakhstan to support international links between other countries.

• 산업경영시스템학회지
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• 제35권4호
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• pp.83-97
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• 2012

In this paper, we consider a single-manufacturer single-buyer supply chain problem where a single manufacturer purchases and processes raw materials into a family of items in order to deliver a family of items to a single buyer at a fixed interval of time for effective implementation of Just-In-Time Purchasing. An integrated multi-item lot-splitting model of facilitating multiple shipments in small lots between buyer and manufacturer is developed in a JIT Purchasing environment. Previous research on the integrated model assumed that the manufacturer orders raw materials m (integer) times for every production run (lot multiplier policy for the raw material). In this paper, we consider a generalized policy in the replenishment of raw materials, allowing lot multiplier policy and lot splitting policy. An iterative solution procedure is developed to find the order interval for finished goods and raw materials, and number of shipments between buyer and manufacturer. We show by numerical example that when the integrated policy is adopted by both buyer and manufacturer in a cooperative manner, both parties can benefit.