• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 한국방송∙미디어공학회 2018년도 하계학술대회
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• pp.264-266
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• 2018

본 논문에서는 빔-호핑 위성 전송 시스템을 운용하기 위해 필수적으로 이루어져야 하는 빔 스위칭 타임 플랜 (Beam Switching Time Plan, BSTP) 동기 기법을 제안한다. 제안하는 기법은 게이트웨이의 변조 모듈에서 SF (super-frame) 신호를 전송한 후, 레퍼런스 수신 모듈에서 신호 전송 후 프레임 검출이 일어나기까지 걸리는 시간과 유효한 신호 검출 후 프레임 검출이 일어나기까지 걸리는 시간을 이용하여 BSTP 동기를 이룬다.

• Proceedings of the KSR Conference
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• 한국철도학회 2011년도 정기총회 및 추계학술대회 논문집
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• pp.2077-2081
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• 2011

Recently the train indusrty come to the fore because of Punctual, eco-friendly transportation system and becoming the main transportation. The construction plans for the trian depot for train's maintenance and storage increase constantly. For past few years, there were many construction plans, Bubal train depot, Gwangju train depot, Duckha train depot. Proper track distribution plan is important to carry out the design of railway depot for efficient maintenance operation and train storage. Through the proper design of track distribution plan, we can shorten the moving time, train movement distance, waiting time in train depot. In this paper, the verification of the track distribution plan's efficiency and appropriateness for railway depot as Bubal train depot's plan is studied and analyzed with the train depot management simulation program-Posrail(v1.0).

• Communications for Statistical Applications and Methods
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• 제17권1호
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• pp.89-98
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• 2010

In this paper, a two-stage group sampling plan based on the time truncated life test is proposed for the Weibull distribution. The design parameters such as the number of groups and the acceptance number in each stage are determined by satisfying the producer's and consumer's risks simultaneously when the group size and the test duration are specified. The acceptable reliability level is expressed by the ratio of the true mean life to the specified life. It was demonstrated from the comparison with single-stage group sampling plans that the proposed plan can reduce the average sample number or improve the operating characteristics.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• 제23권10호
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• pp.687-698
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• 2011

In this study, it was analyzed by a numerical analysis that plan/design considerations for ensuring the spectator safety of large arena audiences in a fire emergency evacuation plan. The latest issue, the 'performance-based design', fire and evacuation plan is important. But nowadays 'Specification-based design' is in common. In evacuation simulation, congestion of exit and aisle is ignored because only evacuation time of large-space is mainly analyzed. In smoke flow,'smoke filling effect' tends to be overrated. From now on, when design a field house, it is needed not 'smoke filling effect' and 'large-space evacuation' analysis, but analyzing 'whole building evacuation time' for ensuring fire evacuation safety of spectator.

• Communications for Statistical Applications and Methods
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• 제17권3호
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• pp.319-326
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• 2010

In this paper, a new group sampling plan for the lot acceptance is proposed for the time truncated life test, which can be utilized when multi-item testers are implemented. The design parameters are found using the two-point approach such that the producer's and consumer's risks are satisfied simultaneously at the acceptable reliability level and the lot tolerance reliability level, respectively. The case of Weibull distribution is described to illustrate the procedure that can be used when the quality level is expressed by a multiple of the specified life. The advantage of the proposed plan is demonstrated by comparing with the existing plan in terms of the sample size required. The tables are constructed and some examples are given to illustrate the procedure developed here.

• Journal of the Korean Institute of Navigation
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• 제14권4호
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• pp.1-15
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• 1990

With increasing ship's speed turnround and port time becomes a large percentage of total roundtrip time and this causes to accelerate the introduction of the various kind of modern handling equipment, the standardization of cargoes, and the improvement of the ship. However, it is still a drag on efficient operation of ship. Similarly, the turnround time at the container port is very important as a measure for the decision of the efficiency of port. To decrease operating coasts, the minimization of the time need to cargo handling at the ports of call must be achieved. Thus the optimization of the time need to cargo handling at the ports of call must be achieved. Thus the optimized Container Loading Plan is necessary, especially under the rapid speed of container operations. For the container loading plan, in this thesis, we use the hungarian method and the branch and bound method to get the initial disposition of both maximization of ship's GM and minimization of shift number to the obstructive container in a yard area. We apply the dynamic programming algorithm to get the final disposition for minimizing total turnroudn time and finally we analyzed the results to check whether the initial disposition is proper or not.

• Journal of the Korean Professional Engineers Association
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• 제15권3호
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• pp.37-48
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• 1982

A comprehensive plan for provincial development which has been establishing and is about to be completed in 1982, has for its object that concretely develop the undertaking of the second comprehensive Program for land development under the Multiple Purpose Development of the Land Act. The limitations of the establishing tile plan which is subordinated to the Program for land development are, firstly of a difficulty of accepting upper and related plans, secondly, of limit and range of time, space and contents, and thirdly, of validity of the plan in practice. There fore, in order to solve the problems the plan firstly, has to introduce 〃the principle of composition and resolution of forces〃 into approaching to the acceptance of upper and related plans secondly, has to prefer micro approaching to macro in planning, and thirdly, has to have a flexibility of planning which will be easily changed into reasonable plan according to continuous co-ordinated process with the government authorities and inhabitants.

• Industrial Engineering and Management Systems
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• 제3권2호
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• pp.116-122
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• 2004

This paper presents a process plan selection model with multiple objectives. The process plans for all parts should be selected under multiple objective environment as follows: (1) minimizing the sum of machine processing and material handling time of all the parts considering realistic shop factors such as production volume, processing time, machine capacity, and capacity of transfer device. (2) balancing the load between machines. A multiple objective mathematical model is proposed and an evolutionary algorithm with the adaptive recombination strategy is developed to solve the model. To illustrate the efficiency of proposed approach, numerical examples are presented. The proposed approach is found to be effective in offering a set of satisfactory Pareto solutions within a satisfactory CPU time in a multiple objective environment.

• Journal of the Korean housing association
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• 제14권6호
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• pp.87-93
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• 2003

The purpose of this study is to investigate the characteristics of the spatial composition at the Modern Korean houses after the time of the enlightenment in Daegu province. The orientation of the houses, way of the entrance and its relation to the inner house(An-Chae), the type of floor plan, the compositional methods of exterior space, and the usage of exterior space are investigated. As the results, the Modern Korean houses after the time of the enlightenment in Daegu province are showed the symptom of the modernization in aspect of the site plan and the compositional methods of exterior space.

• Journal of Industrial Technology
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• 제18권
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• pp.139-148
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• 1998

Traditionally, the problems of manufacturing technology and manufacturing management have been treated independently. In this research, we endeavor to integrate the process planning and scheduling activities as an attempt to integrate the two realms. To draw up a plan of process planning and scheduling in real manufacturing environment is not an easy task because available time to plan could be limited and the shop status could change frequently. So we propose an architecture of integrated process planing and scheduling problem within the allowed time even if sheep situations change rather frequently. We argue that we can obtain a better and practical scheduling solution by dynamically changing the processing machines and operations as the shop condition changes. The proposed system takes the initial information for alternative machines and operations represented by an AND/OR graph as its input. Other informational inputs to the system are part order and shop statues. The system then generates new process plan and schedules during permitted time. Experimental results show that the proposed scheme provides a viable solution for real world scheduling problems.