• 디자인학연구
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• 제17권1호
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• pp.163-178
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• 2004

본 연구에서는 신제품 개발시 최적 디자인을 선정하기 위한 의사결정방법이 많지 않은 상황에서 계층적 분석 모형을 이용해 신제품 디자인 요소들간의 계층적 구조를 분석하고 요인별 중요도를 추출하였다. 신제품 디자인 개발에 적용되는 디자인 요소의 중요도를 도출하기 위해 우선순위 도출에 관한 연구모형을 설계하고, 평가항목을 설정하였으며, 이들 변인들간의 관계를 알아보기 위해 실증적 연구접근을 실시하였다. 분석에 의한 디자인 요소별 평가결과를 요약하면 다음과 같다. 첫째, 적용을 위한 항목선정에 있어서 선행연구 자료를 통해 도출한 평가요소들을 다차원척도를 통해 4가지 차원으로 그룹화하였으며, Digital TV 제품과 관련된 속성을 36항목으로 구성하였다. 요인분석을 통하여 36항목의 평가세부기준들을 가능한 줄여서 간명성을 확보하고, 여러 항목들이 가지고 있는 특성을 하나의 요인으로 줄였다. 그 결과로 기능적 요소에서는 4개 요인을 추출하였고, 심미적 요소에는 3개 요인을 추출하였으며, 상징적 요소와 경제적 요소에서는 각각 2개 요인을 추출하였다. 둘째, 하나로 묶은 세부요인들은 다시 계층적 분석법을 통해서 서로간의 1:1 비교를 통해 중요도를 산출하였다. “Digital TV 구매시 디자인 요소의 중요도 평가”라는 전반적인 목표를 달성하기 위해 고려해야 할 상위기준과 각 기준에 대한 하위기준을 계층화하고 그에 따른 쌍별비교를 통해 요소의 중요 우선순위를 도출하였다.

• 산업기술연구
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• 제22권B호
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• pp.79-88
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• 2002

This paper deals with a case study on the process improvement and the layout design of a boiler factory with FactoryCAD. Firstly, two alternatives of job reallocation are suggested with the understanding of problems in current process. The layout planning for these new alternatives is carried out by simple procedure and the detailed analyses are performed by the aid of FactoryCAD program. The result shows that the new layout plan brings on about 10% reduction of travel distance. The utilization of FactoryCAD program can simplify the process of layout design.

• Wind and Structures
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• 제39권1호
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• pp.15-30
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• 2024

In this paper, detailed wind field data of the full path of typhoon "Bailu" were obtained based on site measurements. Typhoon "Bailu" made first landfall southeast of the Taiwan Strait with a wind speed of approximately 30 m/s near the center of the typhoon eye and a second landfall in Dongshang County in Fujian Province. The moving process is classified into 3 regions for analysis and comparison. Detailed analyses of wind characteristics including wind profile, turbulence intensity, gust factor, turbulence integral scale and wind power spectral density function at the full process of the typhoon are conducted, and the findings are presented in this paper. Wind speed shows significant dependence on both the direction of the moving path and the distance between the typhoon center and measurement site. Wind characteristics significantly vary with the moving path of the typhoon center. The relationship between turbulence intensity and gust factor at different regions is investigated. The integral turbulence scales and wind speed are fitted by a Gaussian model. Such analysis and conclusions may provide guidance for future bridge wind-resistant design in engineering applications.

• 대한조선학회논문집
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• 제48권3호
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• pp.215-221
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• 2011

To improve the naval ship acquisition process, systems engineering, modeling and simulation, etc. have been introduced, and there has been ongoing research on acquisition systems for effective support of it. However, due to characteristics of the naval ship acquisition process, development process mainly carried out at a shipyard such as basic design, detailed design, construction and test is difficult to integrate with the acquisition systems of IPT(Integrated Project Team). In addition, research aimed to improve this is rather lacking. In this paper, the naval ship product structure concept proposed in previous research was applied to the basic design system at shipyard, and basic research for expanding the coverage of naval ship acquisition systems to the basic design phase is performed. A data structure of modeling system appropriate to the basic design phase was proposed through research findings and the prototype system based on it was implemented.

• 한국정밀공학회지
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• 제28권8호
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• pp.878-885
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• 2011

A kinematically-hybrid 5-axis machine tool is analyzed from the perspective of machine tool design. Its kinematic characteristics are pointed out, which should be considered during the conceptual design process. A result of the structural analysis of the machine is presented, which is performed during the detailed design process. It is also presented how we improve the thermal characteristics of the machine tool by changing the installation position of the actuators.

• International Journal of Control, Automation, and Systems
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• 제2권3호
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• pp.362-373
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• 2004

In this study, we introduce a noble neurogenetic approach to the design of the fuzzy controller. The design procedure dwells on the use of Computational Intelligence (CI), namely genetic algorithms and neurofuzzy networks (NFN). The crux of the design methodology is based on the selection and determination of optimal values of the scaling factors of the fuzzy controllers, which are essential to the entire optimization process. First, tuning of the scaling factors of the fuzzy controller is carried out, and then the development of a nonlinear mapping for the scaling factors is realized by using GA based NFN. The developed approach is applied to an inverted pendulum nonlinear system where we show the results of comprehensive numerical studies and carry out a detailed comparative analysis.

• 한국수자원학회논문집
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• 제53권1호
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• pp.29-43
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• 2020

본 연구의 목적은 하천복원에 스텝-풀 연속체를 적용하기 위해 기존 연구결과에서 스텝-풀의 기하구조, 형성 과정, 수리 기능, 복원 및 생태 기능과 관련된 사항을 검토하여 설계기준 및 세부설계 모델을 제시하는 것이다. 분석 및 검토결과를 바탕으로 스텝 간격과 하폭의 비, 단위스텝경사와 하상경사의 비, 및 스텝 높이와 입경 비로서 스텝-풀의 구조 및 규모에 대한 설계기준을 제시하였고, 스텝의 구조적 안정성 확보를 위해서는 키스톤 이론을 근거로 전도에 대한 안정성 해석방법을 설계기준으로 제시하였다. 세부설계 개념으로서 스텝-풀의 평면, 종단 및 횡단 구성에 키스톤과 아치스톤에 대한 겹침구조를 적용한 배치 모델을 제안하였다.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 2002년도 춘계공동학술대회
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• pp.1093-1096
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• 2002

In this paper, a new semi-automated cyber character generating method is presented. Local edge detection tools extract face contour from graphic image files. Some graphic manipulation process detailed touch to obtain neat face contour. This method shortens the making process dramatically while maintaining the good quality similar to real face image. Some of the processed images are illustrated for clear explanation.

• 한국정밀공학회지
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• 제19권8호
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• pp.116-125
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• 2002

Semi-Solid Diecasters usually carry out the Semi-Solid diecasting experiments before producing new casts. At the Semi-Solid diecasting stages, the runner-gate part has been always repeatedly corrected, which leads to a tedious processing time and increased processing cost. A large amount of experience is essential in manual assessment and if the design is defective, much time and a great deal of efforts will be wasted in the modification of the die. In this study, design system has been developed based on design database. In addition, gate experiment for gating system design has been carried out to append the database. It is possible for engineers to make efficient gating system design of Semi-Solid diecasting and it will result in the reduction of expenses and time to be required. The detailed contents of the research are described in the followings.

• 한국유체기계학회 논문집
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• 제19권3호
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• pp.5-9
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• 2016

The purpose of this paper is to define criteria to be used as part of the engineering design for an oil sands plant equipped with the steam assisted gravity drainage process. In this effort, the oil treatment process of an oil sands plant on a pilot scale was focused for detailed investigation. The thermodynamic properties of the process fluid, which is mainly composed of bitumen and water, were estimated with the CPA model. The commercial tool aspen HYSYS was used for the analysis throughout this work along with the provided input data and some necessary assumptions. From the simulation results, the heat and mass balances for a 300 BPD plant were established in order to define standard data for its modular design. In particular, the basis of design for equipment size, heat transfer areas, capital cost and operation cost was extensively discussed.