• 한국시뮬레이션학회:학술대회논문집
• /
• 한국시뮬레이션학회 2003년도 춘계학술대회논문집
• /
• pp.129-134
• /
• 2003

In this paper, we determine optimal reduction in the lead time and setup cost for some stochastic inventory models. And we propose more general model that allow the backorder rate as a control variable. We first assume that the lead time demand follows a normal distribution. And we assume that the backorder rate is dependent on the length of lead time through the amount of shortages. The stochastic models analyzed in this paper are the classical continuous and periodic review policy models with a mixture of backorders and lost sales. For each of these models, we provide a sufficient conditions for the uniqueness of the optimal operating policy. We also develop algorithms for solving these models and provide illustrative numerical examples.

• 한국컴퓨터정보학회:학술대회논문집
• /
• 한국컴퓨터정보학회 2014년도 제50차 하계학술대회논문집 22권2호
• /
• pp.189-190
• /
• 2014

현재 명동성당을 제외한 나머지 성당에 성물 방에서는 성물 판매 및 입고 장부, 수입 지출내역을 수기 식으로 운영 하고 있다. 따라서 본 시스템은 성당 성물 방에 적합한 판매재고관리 시스템을 개발하는데 그 목적이 있다. 본 개발 시스템은 성당에서의 성물 입고 및 판매, 재고 관리에 목표를 두고 주로 통계 및 재고관리와 반응 형 웹에 초점을 맞추어 개발되었다. 재고 관리를 위한 입고현황, 판매현황, 제품현황과 거래처 관리를 위한 거래처 현황, 거래처 거래현황을 주목적으로 하였다. 재고관리의 경우 재고가 적정재고 보다 수량이 적으면 알림을 띄워 알려주고 재고가 없으면 판매 할 수 없도록 하였다. 시스템을 개발함으로서 보다 효과적인 재고관리에 주력하였고, 입고, 판매, 수입 지출 내역을 장부로 직접 작성하면서 생기는 오류에 관련된 문제를 해소하도록 하였다. 스마트 폰에서 볼 수 있는 App을 별도로 개발 하지 않고 하나의 시스템으로 운영되어 유지보수 및 관리를 손쉽게 하기 위하여 반응 형 웹을 적용하여 스마트폰, 데스크 탑, 태블릿 PC등 각각 해상도가 다른 화면에서 동일한 정보를 제공하도록 하였다.

• International Journal of Advanced Culture Technology
• /
• 제5권1호
• /
• pp.70-75
• /
• 2017

Recent development of IT industry including smart phones and communication technologies has resulted in rapid growth of Internet of Things (IoT) technology and relevant markets. The access to IoT is becoming easier thanks to the boards and IoT products, such as Arduino and Raspberry Pi. Large-scale business sites use IoT technology to manage inventories, but small-scale business sites do not. In the present study, We ported Linux-based Raspbian to Raspberry Pi, It utilizes web server communication to control the Arduino through the application We used a color sensor to figure out the kind of inventory. We also built a database using MySQL to store the data. We used raspberry pi to check whether the proposed system works and apply it to small-scale business.

• 산업경영시스템학회지
• /
• 제32권4호
• /
• pp.45-52
• /
• 2009

The objective of this was to improve a transportation cost relation between Central Distribution Centers(CDCs) and Regional Distribution Centers(RDCs), to control inventory cost concerning safety stock for each service level, by reviewing distribution steps connecting CDCs and RDCs under the price discount. It was also to examine and compare operating costs for the following two alternative suggestions for setting the service standard as a counter measure for a stock-out of the distribution network system management. First, provision by dispersing the safety stock to the CDCs and RDCs; and second, exclusive provision of the safety stock only to the RDCs. The cost comparison analysis was made for each category of purchase costs, regular transportation costs, express transportation costs, and inventory holding costs.

• 대한가정학회지
• /
• 제29권1호
• /
• pp.189-201
• /
• 1991

The purpose of this study was to validate the KMBI(Korean Maternal Behavior Inventory). Subjects were 1179 mothers of 4th-6th graders in the elementary schools from 5 small and medium cities and 5 urban cities in Korea. Pearson's γ, Cronbach's α, Cramer'sν, one-way ANOVA were conducted for the statistical analyses. The major findings were as follows. 1. The reliability coefficient of the scale (α) were ranged 0.62-0.79 and 0.70-0.82. 2. The discriminant coefficients(ν)of the item were ranged 0.40-0.83. 3. By the analysis of multitrait-multimethod matrix, convergent validity coefficients(γ) were ranged 0.28-0.66: and discriminant validity coefficients(γ) were ranged 0.28-0.66. 4. Significant sex differences were found in the scores of Affection, Overprotection, Achievement, and Achieve Involvement: significant SES differences were found in the scores of Reasoning Guidance, Affection, Overprotection, Achievement, & Active Involvement: and significant region differences were found in the scores of Authoritarian Control and Achievement.

• 대한산업공학회지
• /
• 제41권5호
• /
• pp.447-452
• /
• 2015

This paper considers a two-stage make-to-stock production system. The first stage produces a single-component and the second stage produces a make-to-stock product using components. In addition to internal demands, the first stage faces external demands with the option of accepting or rejecting. To ration component inventory, the manufacturer adopts a static rule. This paper analyzes the production controls at both facilities that maximizes the manufacturer's profit. Using the Markov decision process model, we characterize the optimal production policy by two monotonic switching curves.

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 1999년도 추계학술대회논문집
• /
• pp.83-90
• /
• 1999

Centralized safety stock in a periodic replenishment system which consists of one central warehouse and m regional warehouse can reduce backorders allocation 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 inventories in the regional warehouse everyday, and develop an algorithm minimize shortage in each replenishment cycle using dynamic programming approach.

• 한국신뢰성학회지:신뢰성응용연구
• /
• 제7권3호
• /
• pp.119-126
• /
• 2007

This paper deals with (s, S) spare part inventory model. Maintaining appropriate spare parts is one of the most important military affairs related to the readiness of military forces. In the problem under consideration, a military unit possesses n equipments and all the n equipments should be in operational readiness for the military purpose. The lifetime distribution of a part has been assumed to be exponential. This paper suggests the reorder point and order quantity under the assumption that the lifetime distribution of a part is weibull.

• 대한안전경영과학회지
• /
• 제5권4호
• /
• pp.209-217
• /
• 2003

The traditional Kanban needs a lot of preconditions for fitting conditions of dynamic production processing environment. The traditional Kanban isn't suitable conditions of dynamic production processing environment. Therefore conditions of dynamic production processing environment is needed more stable system. This study is describe CONWIP system such as suitable in dynamic production processing environment. Most Pull system is a Kanban system than use Kanban cards or signal for production management and inventory control. The object of Kanban system is reducing inventory between shop-floor that can reduce inventiry cost. If the system reduce the number of Kanban cards would be reduce the working process WIP, can be reduced and can be found all potential problem of production between shop-floors. This study apply to CONWIP system model for Korean industrial companies.

• 시스템엔지니어링학술지
• /
• 제17권2호
• /
• pp.1-8
• /
• 2021

This study proposes a systems engineering approach for the development of an advanced planning & scheduling (APS) system for a cosmetic case manufacturing factory. The APS system makes production plans and schedules based on the injection process, which consists of 27 plastic injection machines in parallel to control recommended inventory of products. The system uses machine operation/failure information and defective product/work-in-process tracking information to support intelligent scheduling. Furthermore, a genetic algorithm model is applied to handle the complexity of heuristic rules and machine/quality constraints in this process. As a result of the development, the recommended inventory compliance rate is improved by scheduling the 30-day production plan for 15 main products.