• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.26 no.1
• /
• pp.85-94
• /
• 2003

In this paper, a mathematical model is developed for economic design of multi-stage distribution system that consists of factory, central distribution centers, local distribution centers and retailers. The retailers are supplied products from different stage suppliers according to order size. The retailers are supplied products from factory if demand amount is large, central distribution center if medium, local distribution center if small. The economic design is to determine the economic size of facility factors that consist of distribution system. The cost factors are transportation cost from supply places to demand places, handling cost at distribution centers and inventory holding cost at retailers. It is to determine the transportation route of each retailer, the size and number of the vehicle at factory and distribution centers, the handling amount at distribution centers in order to minimize the total costs. The mathematical model is represented, the solution procedure is developed, and a numerical example is shown.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2002.05a
• /
• pp.463-468
• /
• 2002

Recently, a multi-facility, multi-product and multi-period industrial problem has been widely investigated in Supply Chain Management(SCM). One of the key issues in the current SCM research area involves reducing both production and distribution costs. We have developed an optimization model to tackle the above problems under the restricted conditions such as transportation time and a zero inventory. The model can be used to deride an appropriate factory and assign an optimal output the factory yields. This paper deals with the main idea of the proposed methodology in depth.

• Journal of The Korean Society of Agricultural Engineers
• /
• v.50 no.4
• /
• pp.51-58
• /
• 2008

Unit costs for energy production in bioenergy facilities are dependent upon both fixed cost for facility construction and operational costs including biomass feedstock supply. With the increase of capacity, unit fixed cost could be decreased while supply cost tends to increase due to the longer transportation distance. It is desirable to take into account biomass availability in planning bioenergy facilities. A cumulative curve relationship was proposed to relate biomass availability and cumulative products of biomass amount and transportation distance. Optimum size of gasification facilities was affected by collection cost, biomass cumulative relationship. Based on biomass availability of Icheon-City, optimum sizes were about $400kW_{th}$ for gas production, and about $200kW_{el}$ for power generation. Unit cost of bioenergy production could be substantially reduced by reducing collection cost through supplying biomass from diverse sources including land development areas where significant amount of waste wood is generated. When planning bioenergy facilities, however, biomass availability and spatial distribution are key factors in determining the size of capacity.

• Journal of the Korea Safety Management & Science
• /
• v.10 no.1
• /
• pp.139-144
• /
• 2008

Recently, a multi-facility, multi-product and multi-period industrial production-distribution planning problem has been widely investigated in Supply Chain Management (SCM). One of the key issues in the current SCM research area involves reducing both production and distribution costs. We have developed an optimization model to tackle the above problems under the restricted conditions such as transportation time and a zero inventory. Computational experiments using commercial tool Ms-Excel Solver show that the real size problems we encountered can be solved in reasonable time. The model can be used to decide an appropriate production-distribution planning problem in SCM research area.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2018.10a
• /
• pp.47-48
• /
• 2018

In this paper, by utilizing the function of the electronic chart display information system, which is a device that displays the waterway information such as the position, sink, speed, chart information, and depth of the ship, Implementation of electronic chart viewer system focusing on information collection, installation, operation and maintenance of traffic facilities.

• Korean Journal of Human Ecology
• /
• v.7 no.1
• /
• pp.81-99
• /
• 2004

This study examined one room(studio apartment) residential deweller's housing behavior and housing need, and the relationship between the sense of housing values and housing satisfaction of one-room residence, The study surveyed 302 one-room residents in Busan city. The researcher modified, complimented, and used the previous researches on housing values and housing satisfaction. The analysis of the data used SPSS Win 10.0 program. The results of the research can be summarized as follows: 1. The motive of choosing one-room residence was mainly the closeness to the school or work, Jeonse(Rent with a one-room deposit) was more common than ownership, and the size is one-room residence was 10 to 15 Pyeong. 2. Among the five housing values of one-room residence dwellers, that is, amenity, indoor and outdoor environment, economy/convenience, convenience in transportation, and the interior functionality, the convenience in transportation was ranked highest, and the indoor and out door environment and economy/convenience followed. 3. The housing satisfaction of one-room residents was highest in location, and also high in the safety and the security or privacy, and the convenience of inside facility.

• International conference on construction engineering and project management
• /
• 2015.10a
• /
• pp.420-424
• /
• 2015

The luffing-tower crane (T/C) is a key facility used in the vertical and horizontal transportation of materials in a tall building construction. Locating the crane in an optimal position is an essential task in the initial stages of construction planning. This paper proposes a new optimization model to locate the luffing T/C in the optimal position to minimize the transportation time. An optimization algorithm, the Harmony Search (HS) algorithm, was used and the results show that HS has high performance characteristics to solve the optimization problem in a short period of time. In a case study, the proposed model offered a better position for T/C than the previous heuristic approach.

• International conference on construction engineering and project management
• /
• 2015.10a
• /
• pp.19-20
• /
• 2015

Since 2013, Seoul Metropolitan Government (SMG) has introduced big data initiatively in administration and put into practices in transportation, safety, welfare in order to overcome limited resources and conflicting interests. For establishing a new midnight bus service, SMG prepared optimized midnight bus routes by analyzing big data from mobile phone Call Data Record (CDR) through collaboration with a telecommunication company. Despite of limited budget and resources, newly identified routes can cover over 42% of the citizen with 9 routes and less than 1% of buses compare with day time operation. In addition to solve transportation problem, SMG utilizes big data to resolve location selection problem for choosing new facility locations such as life double cropping centers and senior citizen leisure centers. As results, SMG demonstrates big data as a good tool to make policies and to build smarter city by overcome space-time limitation of resources, mediation of conflicts, and maximizes benefit of the citizen.

• Proceedings of the Korean Society of Precision Engineering Conference
• /
• 2005.06a
• /
• pp.1715-1718
• /
• 2005

During demonstrations of a process conditioning spent nuclear fuels, it may be necessary to transport and handle Spent fuel road cuts from Post Irradiation Examination facility to Slitting device in The hot cell. It may be not easy to transport spent fuel rod cuts because rod cuts are high radioactive materials. For this purpose, we have developed a capsule for transporting and handling high radioactive materials. We have analyzed conditions of a hot cell and requirements of the device, designed and manufactured The prototype of the device, and done some performance tests. From the tests, it has been shown that transportation and handling without scattering nuclear material was smooth but the weight of capsule was heavy. These result will be reflected to a design of the improved transportation and handling device which will be used during demonstrations.

• The Journal of the Korea Contents Association
• /
• v.12 no.5
• /
• pp.470-477
• /
• 2012

Climate related policies have been considered due to increase of energy and fossil fuel consumption. Therefore, research has been done to reduce $CO_2$ and to implement green construction. This paper proposes green construction performance metrics for transportation facilities based on previous literature review and survey. The metrics are composed with economic, social, and environment parts and number of metrics are 14, 10, and 12 respectively. The survey was performed to evaluate relevance, clarity, timeliness, comparable, and obtainable of the proposed metrics. Then implementation strategy is also proposed for effective use.