• 산업경영시스템학회지
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• 제20권42호
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• pp.39-47
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• 1997

There are four parameters (i.e. overall density, local density, grouping, layout complexity) to consider in designing screen of a visual display terminal. Among these, only the optimum level of overall density is known to be about 25~30% by some studies. Therefore, the present experiment is conducted to define the optimum levels of the other parameters to achieve the user's best performance in visual search task. The results are as follows; (1) The function related to the levels of local density and user's search times is shown to be U -shaped. When the level of local density is about 40%, the search time is shorter than those of any other levels. (2) In the experiment of grouping, user's performance is best when the number of group is 5, and the size of group does not exceed visual angle $5^{\circ}$ (0,088rad). (3) The user performance is improved as the layout becomes less complex.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2002년도 춘계학술대회 논문집
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• pp.86-91
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• 2002

The production part requiring multiple processes such as piecing, blanking and notching, are performed with a high production rates in progressive die. In order to prevent the dejects of process result, the optimum of strip process layout design, die design, die making, and tryout with inspection etc. are needed. According to these factors of die development process, they required theory and practice of metal working process and its phenomena, die structure, machining conditions for die making, die materials, heat treatment of die camponents, know-how and so on. In this study, we designed and analyzed die camponents also simulated the strip process layout of multiple stage drawing by DEFORM. Especially the result of tryout and its analysis become to the feature of this study.

• 한국해양공학회:학술대회논문집
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• 한국해양공학회 2000년도 춘계학술대회 논문집
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• pp.35-39
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• 2000

The piercing and blanking of thin sheet metal working is specified division in press die design and making. In order to prevent the detects, the optimum design of the production part, strip process layout, die design, die making and try out etc. are necessary the analysis of effective factors. For example, theory and practice of metal shearing process and its phenomena, die structure, machine tool working for die making, die materials and its heat treatment, metal working in industrial and its know how etc. In this study, we analyzed whole of data base, theoretical back ground of metal working process, and then performed the progressive die tryout with the screw press. This study regards to the aim of small quantity of production parts press working. Part 1 of this study reveals with production part and strip process layout design.

• 한국공작기계학회:학술대회논문집
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• 한국공작기계학회 2002년도 추계학술대회 논문집
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• pp.341-346
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• 2002

The production part requiring multiple processes such as piecing, blanking and notching are performed with a high production rates in progressive die. In order to prevent the defects of process result, the optimum of strip process layout design, die design, die making, and tryout with inspection etc. are needed. According to these factors of die development process, they required theory and practice of metal working process and its background, die structure, machining conditions for die making, die materials, heat treatment of die components, know-how and so on. In this study, we designed and analyzed die components also simulated the strip process layout of multiple stage drawing by DEFORM. Especially the result of tryout and its analysis become to the feature of this study.

• 대한산업공학회지
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• 제15권1호
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• pp.31-39
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• 1989

생산작업의 능률 향상을 위한 방법으로는 첫째로 합리적인 기계배치를 통하여 작업흐름거리를 단축할 수도 있고 또한 배치된 각 기계에 작업을 적시에 공급할 수 있도록 물류시스템을 통제(control)하여 가동율을 높이는 방법도 있다. 본 논문에서는 기계배치결정의 휴리스틱 방법을 개발하고 현재 통상 사용하고 있는 방법과 비교하여 얼마만큼의 능률향상이 가능한가를 실험적으로 제시한다.

• 디지털융복합연구
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• 제17권12호
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• pp.467-472
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• 2019

국내 스마트폰 이용률이 증가함에 따라 모바일 게임의 발전 속도도 빨라지고 있지만, 시장 규모가 커짐에 따라 경쟁이 심화되는 현상이 나타나고 있다. 이러한 모바일 게임 시장에서 게임을 성공시키기 위한 요소 중 하나로 UI를 제시하고 있는데, 이러한 모바일 게임 UI 설계 시 이전에 기능과 심미적 표현, 기능중심디자인과 정보 전달과 더불어 사용자의 경험을 설계하는 측면에서 접근되어야 한다는 주장이 제시되었다. 본 논문에서는 UX요소 중 경험을 이용해 효과적인 모바일 RPG의 로비 layout을 제시하였다. Ernest Adams와 Andrew Rollings의 레이아웃 분류 방법을 통해 google play 누적매출 순위 20위 내 모바일 RPG의 9개를 선정해 로비 layout을 분석한 결과 모바일 RPG장르의 첫 시장 흥행을 이끌었던 게임의 로비 layout이 이후 출시되어 흥행한 게임의 기준이 되었다는 결과가 나왔다. 이는 기존 RPG를 이용했던 경험에 의해 낮은 진입장벽과 학습이 불필요 하다는 점에서 이용자가 이전에 이용하였던 게임과 유사하게 느끼는 로비 layout이 효과적이라고 해석할 수 있다. 향후 연구에서는 RPG 이외의 다른 장르에 관한 최적의 UX를 측정할 수 있는 연구가 진행된다면 넓은 장르의 공통적인 layout을 도출해낼 수 있을 것이다.

• 한국자동차공학회논문집
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• 제19권4호
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• pp.99-106
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• 2011

This paper deals with engine room layout design optimization of fuel cell electric vehicle (FCEV), which has been proposed as a potential alternative to fossil fuel depletion. Investing the great R&D efforts, the global vehicle manufacturers, especially Honda motor corporate, have shown not prototype vehicle but commercial vehicle using fuel cell in the market recently. In this paper, we analyze cooling performance and flow characteristic in the engine room of newly FCEV, in addition we suggest the optimization process for engine room layout design optimization. The two radiators in the vehicle for fuel cell stack and electronic components cooling have been analyzed and their performance are obtained in terms of cooling performance ratio (CPR). The value of CPR should always be less than one and based on criteria, we have achieved the optimum cooling performance of radiators for stack and electronic components. Aerodynamic performance is evaluated in terms of drag coefficient, improved through underbody modification using air devices.

• 콘크리트학회논문집
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• 제20권6호
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• pp.705-712
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• 2008

본 연구에서는 그라운드 구조법을 이용하여 콘크리트 구조형태의 최적화에 대한 수치 실험을 하였다. 마이크로 격자 모델은 단위 셀의 집합체로 구성되었다. 해석 과정은 각 부재의 응답계를 강성에 피드백 시켜서 유한요소해석을 반복하였다. 이 해석의 반복을 통하여, 트러스 모델은 수리적 최적화 수법이 아니라 국소적인 응력 상태를 이용하여 위상적인 구조 형태와 구조적 형상을 표현하였다. 격자 트러스 모델을 여러 예제에 적용하여 형상 배치 문제를 해석하는데 성공하였다.

• 한국기계가공학회지
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• 제11권6호
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• pp.94-99
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• 2012

Due to economic growth, the number of cars has grown rapidly and consequently traffic accidents have grown in direct ratio. This reminds us that braking device of a vehicle is an important factor to prevent traffic accidents. Aim these researches to speed and lighten the braking system of vehicles, to lengthen its durability and to shorten the stopping distance. However, it is still difficult to analyze quantitatively and clearly the reason and solution for abnormal wear of disc and pad or judder in flywheel mode. Therefore this study was carried out to presume for mutual relation of analysis condition to get the optimum temperature by two-way layout. The results shown that coefficient of determination has a fine reliability over 92.57% and temperature is made by two-way layout.

• 대한기계학회논문집A
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• 제30권3호
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• pp.302-309
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• 2006

Effective mixing plays a crucial role in microfluidics for biochemical applications. Owing to the small device scale and its entailing the low Reynolds number, the mixing in microchannels proceeds very slowly. In this work, we optimize the configuration of obstacles in the Y-channel mixer in order to attain maximum mixing efficiency. Before the optimum design, mixing characteristics are investigated using unstructured grid CFD method. Then, the analysis method is employed to construct the approximate analysis model to be used in the optimization procedure. The main optimization tool in the present work is sequential quadratic programming method. Using this approximate optimization procedure, we may obtain the optimum layout of obstacles in the Y-channel mixer in an efficient manner, which gives the maximum mixing efficiency.