• 한국전자거래학회지
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• 제20권1호
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• pp.79-88
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• 2015

웹 서버나 데이터베이스 서버와 같은 컴퓨터 서버들은 연속적으로 리퀘스트 스트림을 받는다. 이런 서버들은 유저들에게 최선의 서비스를 제공하기 위해 리퀘스트들을 스케줄링하여야 한다. 이 논문은 분할 가능 리퀘스트들을 스케줄링할 때 총 스트레치를 최소화하기 위해 혼합 유전자 알고리즘을 제안한다. 리퀘스트의 스트레치는 리퀘스트가 시스템에 머무는 시간에 대한 반응 시간의 비율로 정의된다. 혼합 유전자 알고리즘은 유전자 알고리즘의 활용과 탐구 능력를 개선하기 위해 시드 선택과 개발의 아이디어를 도입하였다. 혼합 유전자 알고리즘과 유전자 알고리즘의 성능을 비교하기 위하여 광범한 컴퓨터 실험이 실행되었다.

• International Journal of Costume and Fashion
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• 제3권
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• pp.121-139
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• 2003

A purpose of this study is to measure degree of solidarity and conflict of the beauty salon franchisees according to an influence strategy of franchiser and grasp characteristics revealed from managing a franchise system. This will also contribute to improving results of franchise systems and considering a direction for development. This study examined existing studies relevant with conflict and solidarity and analysed relativity between relevant variables and grasped the flow of studies and then set hypotheses in order to present a device for decreasing conflict within a franchise system of beauty shops and for increasing a solidarity and subsequently analysed samples and tested data. The data for this study are researched by sending questionnaires to beauty salons which participated in one of franchise systems and they are analyzed by various methods in a statistics. After studying some relevant theories, this study used the definition of the franchise system in beauty salons as an entity of a political-economy paradigm. A franchiser desires to influence member shops with an influence-strategy. Therefore member shops which perceived it go through a conflict and then such a process is revealed as making significant influence on solidarity. Beauty salon franchise exists by reciprocal confidence and transaction. If an opportunism gain in influence owing to an conflict intensification, there would be no steady formation of relationship. Therefore the head office should develop a member-shop-management-system by more scientific and more technical methods and prevent, in advance, member stores from seeking for negative opportunism.

• 한국항해학회지
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• 제23권1호
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• pp.29-43
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• 1999

The production process of the compound-curved hull plates includes hull design, definition, fairing, modeling, lofting, cutting, and forming in sequence. Traditional fabrication methods and shop environment caused low level to productivity in medium and small sized shipyards. The most effective solution to solve those problems is to rationalize the layout of facilities. For the well-balanced development of domestic shipbuilding industry, it is urgently required to reduce the gap between modernized large sized shipyards and traditional small and medium sized shipyards in production technologies and efficiencies. For the efficient and accurate hull piece forming, all information from design to forming should be clarified and organized in a systematic manner. Thus, management of the information plays an important role in the computerized and automated of hull piece forming. The object of this paper is to survey the status of the field, to find out the feasibility and to introduce a draft of hull piece fabrication line for small and medium sized shipyards. The development of required system follows the object oriented technology to extend to simulation based system for carrying out physical product flow and facilities layout analysis. It is feasible to operate such a modernized facility for a group of small and medium shipyards who are unable to have each of their own facility because of its large amount of initial investment and insufficient work load.

• 한국시뮬레이션학회논문지
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• 제12권3호
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• pp.41-53
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• 2003

The major components of an engine are engine block (or cylinder block), cylinder head, crank shaft, connecting rod and cam shaft. Thus the engine shop usually consists of six sub-lines, five machining lines and one assembly line. Flow line is the typical concept of layout for machining these parts, especially for engine block. In order to design an engine block machining line, several factors should be considered such as yearly production target, working hours, machines, tools, material handling equipments and so on. If the designers of manufacturing line were unaware of some factors those would be influenced on the system performance, it would make greater problems in the phase of mass production. Therefore the initial design of engine block machining line should be verified carefully. Simulation is the most powerful tool for analyzing the initial layout. This paper introduces the major factors those should be considered for designing the machining line and their effects on the system performance. 3D simulation models are developed with QUEST. Using the simulation model developed the initial layout is analyzed, and we suggest some ideas for improvement.

• 복식문화연구
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• 제10권6호
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• pp.617-632
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• 2002

The purposes of this study are 1) to classify the consumer group according to clothing purchase store(department store, road shop, discount store, Dongdaemoon & Namdaemoon markets) 2) to analyze the differences between VMD attributes which each consumer group value. The attributes on the VMD are categorized as 5 areas 1) interior 2) show window 3) product display & display change cycle 4) color · light · music · small instrument 5) promotion(POP & salesperson). The data were collected from 238 females students and were analyzed by frequency, percent and X²-test. The results of this study are as fellows . 1) On the attribute of Interior, there were significant differences in terms of flow in a store, rest area, the cleanness of floor, show case, and the merchandise itself. 2) On the attribute of show window, there were significant differences in terms of interst of show window. 3) On the attribute of product display & display change cycle, there were significant differences in terms of display method, and display change cycle. 4) On the attribute of color · light · music · small instrument, there were significant differences in terms of interest of color coordination, luminosity and effect of light, and necessity of music & small instrument. 5) On the attribute of promotion(POP & salesperson), there were significant differences in terms of aid of POP.

• 설비공학논문집
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• 제24권12호
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• pp.867-874
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• 2012

In the present study, three-dimensional transient numerical simulations were carried out to improve the performance of a vehicle paint drying process. In order to describe the movement of a vehicle, the techniques of moving boundary condition and multiple reference flames (MRF) were used. For the validation of the numerical analysis, the predicted temperature on the surface of a vehicle was compared to the experimental data, and a good agreement was achieved. With validated numerical procedure, various operating conditions of the temperature and the flow rate of the supply air were investigated to improve the drying performance of the facility. It is shown that the optimization of the operating condition can lead to energy savings and faster line speed of the production.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 2003년도 추계학술대회 및 정기총회
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• pp.185-192
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• 2003

Digital Manufacturing-based production could be very effective in shipbuilding in order to save costs and time, to increase safety for workers, and to prevent bottleneck processes in advance. Digital shipbuilding system, a simulation-based production tool, is being developed to achieve such aspects in Korea. To simulate material flow in a subassembly line at a shipyard, the product, process and resources was modeled for the subassembly process which consisted of several sub-processes such as tack welding, piece alignment, tack welding, and robot welding processes. The analysis and modeling were carried out by using the UML(Unified Modeling Language), an object-oriented modeling method as well as IDEF(Integration DEFinition), a functional modeling tool. Initially, the characteristics of the shop resources were analyzed using the shipyard data, and the layout of the subassembly line was designed with the resources. The production process modeling of the subassembly lines was performed using the discrete event simulation method. Using the constructed resource and process model, the productivity and efficiency of the line were investigated. The number of workers and the variations In the resource performance such as that of a new welding robot were examined to simulate the changes in productivity. The bottleneck process floated according to the performance of the new resources. The proposed model was viewed three-dimensionally in a digital environment so that interferences among objects and space allocations for the resources could be easily investigated

• 패션비즈니스
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• 제23권4호
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• pp.1-12
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• 2019

The study investigated trends in wall-covering displays in interior design stores. Although studies reported design trends at well-known exhibitions overseas such as Heimtextil and Maison objet, many different cases present actual realistic design flows. This study analyzes the actual market flow rather than design as an exhibition concept, and presents the interior CMF trends in 2019. The CMF design of wall-covering displayed in New York D&D Building in 2019 can be summarized as follows: W was the most frequently seen show-window, but like R, which is a strong color, it is also used to convey surrealistic images. The store entrance was designed to attract consumers' attention inside, and was constructed to reflect the actual trend. In the 2019 New York market, the wall-covering of Gray and YR were displayed through the shop entrance to suggest substantial sales. In addition, the demand for gold metallic wall-covering is significant as gold was strong in many forms. This study represents a valuable resource to identify trends in wall-covering from 2017 to 2019 compared with previous studies. This study represents a valuable foundation for a wide range of topics related to the use of wall-covering for interior decoration.

• 한국항해항만학회:학술대회논문집
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• 한국항해항만학회 2002년도 추계공동학술대회논문집
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• pp.139-145
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• 2002

수로에서의 선박통항으로 인해 주변환경 렌 구조물에 미치는 영향을 평가하기 위하여 선박의 추진기로 인한 흐름을 다루었다. 제한수로에서의 수치모델은 Shield's diagram과 추진기의 운동량 이론을 사용하여 개발하였다. 프로펠러에 의한 추진기방정식은 분사를 정의하는 가장 정확한 수단으로 분사계수와 분사유속을 기초로 하여 수립하였다 추진기분사에 대해 접근한 방법은 적용 선박의 출력에 기초하였으며, 추진기 분사방정식의 주요함수에는 추진력, 프로펠러 직경, 그리고 선박의 속도를 도입하였다. 또한, 수로의 수심과 선박의 홀수도 초기이동한계입경의 계산에 필요하다. 추진기로부터 분사된 유속의 분포는 Gaussian 정규분포함수로 나타내었다 저면마찰속도와 진단응력은 Sternberg 공식으로부터 유도되었으며, 아울러 선박 추진기로 인해 수로저면에서 표사이동에 현저한 영향을 미치는 경우를 사례연구를 통해서 나타내었다.

• 품질경영학회지
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• 제50권1호
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• pp.153-167
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• 2022

Purpose: The purpose of this study is to guide the operation managers who plan daily production of large mass-processing facility that services multi-customers with multi-product, small-batch item characteristics by providing the practical best production quantity and the inventory allowed to build. Methods: Close observation of a subcontract paint-shop operator captured the daily decision process which was reflected in the subcontractor-unique mathematical model and the system dynamics simulation model. Multiple simulations were run to find the practical best production quantity and the maximum allowable stock level of inventory that did not undermine the profit from practical best daily production. Actual data and a few constant values were obtained from the firm under study. Results: While the inventory holding cost for the customer-owned material harms the total profit of the subcontractor, the running cost of the processing facility hinders production in small batches. This balances the maximum possible productions and results in practical best daily production which can be found through simulation runs with actual data. The maximum level of stocked inventory is deduced from the practical best daily production. Conclusion: To build a large volume that enables economy-of-scale production, operators should deal with multi-product small-batch items from multiple customers. When the planned schedule of the time and amount of material in-flow tend not to be reliable, operators can find it practical to execute level production across the planning horizon instead of adjusting to day-to-day in-flow fluctuations.