• Journal of Korean Port Research
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• v.14 no.1
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• pp.37-45
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• 2000

Centralized safety stock in a periodic replenishment system which consists of one central warehouse and m regional warehouse can reduce backorders allocating the centralized safety stocks to regional warehouse in a certain instant of each replenishment cycle. If the central warehouse can not monitoring inventories in the regional warehouse, then we have to predetermine the instant of allocation according to demand distribution and this instant must be same for all different replenishment cycle. However, transition of inventory level in each cycle need not to be same, and therefore different instant of the allocation may results reduced shortage compare to the predetermined instant of allocation. In this research, we construct a dynamic model based on the assumption of monitoring inventories in the regional warehouse everyday, and develop an algorithm minimize shortage in each replenishment cycle using dynamic programming approach.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2006.05a
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• pp.283-287
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• 2006

본 논문에서는 유통 매장에서 상품 진열대 및 상품 보관 창고에 있는 상품의 부족 현상(결품)으로 인한 판매 손실을 최소화하기 위해 적시에 상품을 보충 할 수 있도록 RFID기반 판매 및 재고 상품의 실시간 모니터링을 이용한 자동보충진열 지원 시스템을 제안한다. 제안하는 시스템은 매장의 진열상품과 재고상품에 대한 정보 파악이 실시간으로 가능하며, 지능형 학습에 의한 안전재고 임계값 계산 및 자동 공지 에이전트를 통해 효율적으로 자동 발주 프로세스를 지원해 줄 수 있어 상품 진열대 및 창고의 재고 상품을 효율적으로 관리할 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.18 no.5
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• pp.237-244
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• 2018

The Smart Factory level of manufacturing factories of SMEs now lacks a system for grasping the accurate inventory amount associated with inventory movements in managing warehouses at the basic level. Also, it is difficult to manage accurate materials for loss of data due to worker manual work and production method due to experience. In order to solve this problem, in this paper, automatic acquisition of inventory to minimize manual work to grasp workers' Inventory and improve automation is done. In the smart warehouse management system using the IoT-based autonomous mobile module, the autonomous mobile module acquires the data of the inventory storage while moving through the line. In order to grasp the material of the Inventory storage, The Camera module recognizes the name of the inventory storage. And Then, If output matches, the data measured by the sensor is transferred to the server. This data can be processed, saved in a database, and real-time inventory quantity and location can be grasped in a web-based monitoring environment for administrators. The Real-time Automatic Inventory (RAIC) systems is reduce manual tasks and expect the effects of automated inventory management systems.

• Journal of the Korea Society of Computer and Information
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• v.12 no.5
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• pp.273-284
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• 2007

This paper studies a periodic review inventory model with an e-MarketPlace transaction in reconfigurable manufacturing system(RMS). A decision maker can expand/reduce production capacity/quantities and/or replenish/dispose inventories from/to e-MarketPlace urgently to satisfy the stochastic demands. If inventories are replenished or disposed through e-MarketPlace, this leadtime is shorter than the production leadtime, but unit purchasing or selling cost is more expensive than that of expanding capacity or reducing production quantities respectively. Henceforth, trade-off on these alternatives is considered. In addition to this, in order to consider the economy of scale, our model includes the fixed cost for purchasing from e-MarketPlace and capacity expansion. We use dynamic programming and K convexity methods to characterize the nature of the optimal policy. Finally, We present the optimal inventory control policy which is composed by the combinations of a base stock and (s,S) type policy.

• Journal of Internet of Things and Convergence
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• v.2 no.4
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• pp.27-34
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• 2016

In this paper, we designed and implemented a system to easily check and manage book inventory using web and Android mobile device. In the previous conventional method, the user visits the bookstore directly and then checks the inventory. However, in this case, the user accessibility is inconvenient, and it is troublesome to check or reconfirm the inventory. In order to solve these inconveniences, we provide book inventory management system for requesting book purchase and inquiring bulletin board by book field, and then providing real time inventory check with book application and purchase functions. In addition, through the push notification function, we can catch up with the purchase status of the ordered books on the web and Android mobile device in real time. Therefore, we designed and implemented a function that enables bookstore operators and users to easily and conveniently manage by providing statistical information on inventory data.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.25 no.3
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• pp.78-84
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• 2002

This research is basically deals with an inventory distribution system with several regional sides branches. Under the continuous review policy, each sales branch places an order to its supplier whenever on hand plus on order inventory falls on the order point, and the order quantity is received after elapsing a certain lead time. This research first shows the method how to apply the product with low lever of demand into the continuous review policy. For the application, we use an order level as the maximum level of inventory during an order cycle. Also we analyze the lost sales case as a customer behavior. Further we use variable demands and variable lead times for more realistic situation. Based on the above circumstances, the research mainly discusses those methods to decide the optimal order level, order point, and order quantity for each sales branch which guarantees the system wide goal level of service, while keeping the minimum level of the system wide total inventory.

• Proceedings of the Korean Society of Disaster Information Conference
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• 2022.10a
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• pp.367-368
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• 2022

인공지능을 활용한 시장이 확대되고 있다. 그중 기업의 공장에서는 생산 물품 관리를 위한 효율적인 재고관리 시스템이 요구된다. 본 연구는 AI를 기반으로 RFID Reader와 고해상도 카메라 모듈을 탑재한 드론을 활용하여, 재고 탐색 및 인식 기능이 있는 재고관리 플랫폼에 대하여, 안정적인 드론 운용 기술 방안을 연구해 보고자 한다.

• Journal of the Korea Society for Simulation
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• v.25 no.4
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• pp.65-75
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• 2016

Unused spare parts of military equipments which have been kept in the warehouse for a long term have been recognized as wasting of defense budget which also decreased people's confidence in the field of national defence. It is known that overstock is caused by information distortion and bullwhip effect from downstream to upstream in the logistic support as is like business cases. After upgrading the logistic information system, it is possible for Army Logistics Command(ALC) to know demand information of end-user which is the key factor to reduce bullwhip effect. However, inventory is still overstocked and stock-out at the same time. Previous studies have not accounted for these phenomenons and have mainly focused on forecasting inventory level instead of budgetary process(budget period, PROLT, ASL/N-ASL). Thus, this study focuses on the information distortion, overstock and stock-out which caused by budgetary process in the logistic support with system dynamics and simulation.

• 한국공간정보시스템학회:학술대회논문집
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• 2007.06a
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• pp.261-267
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• 2007

적실하고도 신뢰성 있는 주택정책을 수립하기 위해서는 주택관련 기초자료 및 그에 따른 주택정책지표의 정확성, 정밀성, 시의성이 전제되어야 한다. 본 고에서는 서울시 주택재고산정을 위한 현행 인구주택총조사, 건축물대장(AIS), 과세대장, 주택특성조사 등 기초자료의 현황 및 문제점을 분석하고 개선방안을 제시하였다. 특히 서울시가 보유하고 있는 가장 기본적인 자료라고 할 수 있는 건축물대장자료를 이용한 주택재고 산정문제에 각별한 비중을 두었다. 분석 결과, 각 기초자료별 현행 주택재고 산정기준에 따를 경우, 서울시 소유 거래기준 주택수는 대략 219만${\sim}$232만호에 걸쳐있는 것으로 나타났다. 자료에 따라 주택수가 차이가 나는 이유는 주택의 범위, 분류체계, 산정기준, 원천데이터의 오류 누락 등 수많은 원인에 의한 것인데, 본 고에서는 이들 문제점에 대한 비교분석을 실시하였다. 건축물대장 등은 서울시가 주택 등 건축물 재고파악을 위한 가장 기초적인 자료임에도 불구하고, 이를 이용하여 주택재고를 정확하게 산정하는 것은 자료에 대한 대대적인 정비를 거치기 이전에는 사실상 불가능한 것으로 사료된다. 개선과제로서, 단기적으로는 현행 건축물대장의 주택재고산정방법을 개선할 필요가 있고, 중장기적으로는 기초자료의 구조변경과 데이터정비, 업무정비, 표준 주택분류체계 마련 등이 필요하다. 또한 주택보급률 100%를 눈앞에 두고 있는 상황에서 주택의 양적 지표뿐만 아니라 질적 지표를 지원할 수 있도록 기초자료의 활용성 제고방안이 마련되어야 할 것이다.

• Proceedings of the Korea Society of Information Technology Applications Conference
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• 2007.05a
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• pp.198-208
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• 2007

Recently business enterprises have forced to face in fierce competition in today's global markets due to the short life cycles of products and the higher expectation of customers. Together with continuing advances in communications and transportation technologies, these environments have motivated the continuous evolution of the supply chain and the management techniques. This paper consider three-echelon inventory system which consist of one manufacturer, one distributor and N retailers for a single product under assumption of constant demand. This paper propose the inventory replenishment period using heuristic method and order policy through coordination of inventory replenishment period. The simulation results show that decrease the total cost of the three-echelon inventory system.