• 설비공학논문집
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• 제24권5호
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• pp.428-432
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• 2012

In the waste collection system, living waste is collected through the piping network. There are many confluent pipes in a piping network. These confluent pipes were often clogged up with waste. The optimal configuration of the confluent pipes has been defined by the design guide. However, nobody know how this design guide were determined. Therefore, in this paper, we found the design data for the confluent pipe configuration in order to avoid the waste clogging in a piping network. The distance between connected point on the confluent pipes should be longer than the previous design guide.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2004년도 추계학술대회
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• pp.655-660
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• 2004

The pipes in the outdoor unit of an air conditioner are designed to reduce the vibration effect of the compressor. Three-dimensional structure of the pipe could provide various design choices and the resultant vibration characteristics of the outdoor units. A design program has been developed for an eligible parametric study of pipe design and automatic vibration analysis using commercial software, I-DEAS, and its macro. Optimal design of pipe configuration has been performed using the commercial software, iSIGHT. The optimized design shows 70 percents improvement in the vibration characteristics of the outdoor unit of an air conditioner.

• 한국전산유체공학회:학술대회논문집
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• 한국전산유체공학회 2000년도 춘계 학술대회논문집
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• pp.60-65
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• 2000

An aerodynamic design method has been developed by using a three-dimensional unstructured Euler code and an adjoint code with a discrete approach. The resulting adjoint code is applied to a wing design problem of super-sonic transport with a wing-body-nacelle configuration. Hicks-Henne shape functions are adopted far the surface geometry perturbation, and the elliptic equation method is employed fer the interior grid modification during the design process. Interior grid sensitivities are neglected except those for design parameters associated with nacelle translation. The Sequential Quadratic Programming method is used to minimize the drag with constraints on the lift and airfoil thickness. Successful design results confirm validity and efficiency of the present design method.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.1595-1600
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• 2007

It is necessary a simple helicopter design and performance analysis program for a stage of helicopter conceptual design. To meet that needs, we have developed a program which is simply used to estimate helicopter configuration and performance. The program developed by this study is composed of Requirement, Mission profile Analysis, Size, Aerodynamic, Trim, Propulsion, Weight, and Performance modules, and each modules carry out operations for a given flight condition. In this study, we validate this analysis program in 9,500 1bs and 22,000 1bs helicopters and estimate design configuration and performance of 16,000 1b helicopter. And We can use this program to optimization process for Helicopter MDO framework.

• 한국실내디자인학회:학술대회논문집
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• 한국실내디자인학회 2005년도 춘계학술발표대회 논문집
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• pp.172-177
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• 2005

What kind of information is it got in an exhibition space? And any order is determined and can read an exhibition? Is application possible with interactive design in an exhibition space? All elements must be reflected in an information design in addition to a biological process and perception process. Various uncertainty, a little information about exhibition contents and negative attitude, various ways of thinking, time physical a few psychological fatigue, uncertain target will be for these reasons. When configuration of a space and a human biological element are satisfied in an information design by physical configuration, maximization of a communication between exhibition water and visitor firm names will consist in a museum.

• 한국정밀공학회지
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• 제13권7호
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• pp.66-77
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• 1996

Optimal topology design is to search the optimal configuration of a structure which can be used as a shape at the conceptual design stage. Our objective is to maximize the stiffness of the structures and ribs under a material usage constraintl. The density of each finite element is the design variable and its relationship with Young's modulus is expressed by quadratic form. The configuration is represented by the entire density distribution, the structural analysis is performed by finite element method and the optimiza- tion is performed by Feasible Direction Method. Feasible Direction Method can handle various problems simultaneously, that is, mult-objectives and multi-constraints. Total computation time can be reduced by the quadratic relationship between the density and the material property and fewer design variables than Homogenization Method. Toplogy optimization technique developed in this research is applied to design the shapes of the ribs.

• 한국통신학회논문지
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• 제25권8A호
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• pp.1085-1095
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• 2000

이 논문에서는 시스템의 라우팅 구성 장애를 진단하고 복구하기 위한 규칙과 알고리즘을 제시하고 이를 이용하여 피관리 시스템에서 발생한 라우팅 구성장애를 자동으로 관리할수 있는 시스템을 JAVA를 이용하여 설계하고 구현하였다. 라우팅 구성장애 관리를 위하여 네트워크 구성 관리 생성 규칙 라우팅 구성장애 진단 생성규칙 라우팅 구성 장애 복구 생성규칙을 제안하였으며 후향 추론 알고리즘을 기반으로 이런 생성규칙간의 상호 연동을 위하여 메타 규칙을 적용하여 시스템을 구현하였다 구현한 시스템을 시나리오에 기반하여 규칙 Blackboard 목표의 변화과정을 보여줌으로써 실험결과를 제시하였다. 이 논문에서는 이질적으로 급변하는 네트워크 환경에 능동적으로 대처할수 있는 시스템 구현을 통해서 시스템의 라우팅 구성장애 관리에 드는 비용과 시간을 줄이고 시스템의 네트워크 구성 장애 관리를 위한 방법론을 제시하고자 한다.

• 항공우주기술
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• 제4권1호
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• pp.31-38
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• 2005

체공형 부양선인 Aerostat에 대한 개념설계를 수행하였다. 기존의 풍동 시험자료를 참조하여, 정적 종안정성을 확보하기 위한 Aerostat의 외형 설계를 수행하였다. 주어진 동체형상과 길이에 대한 표면적 및 부피는 Cubic Spline을 이용하여 수치적으로 계산하였고, 반복계산을 통하여 동체의 길이를 결정하였다. 개념설계를 위한 케이블 장력과 중량, 그리고 임무장비 무게를 산정하였다. 중량과 임무고도 등과 같은 중요한 설계 변수에 대한 민감도를 분석하였으며, 그 결과로서 30m급의 Aerostat 시스템에 대한 개념 설계결과를 제시하였다.

• 한국CDE학회논문집
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• 제10권4호
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• pp.284-292
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• 2005

This paper presents a new framework of kinematic tolerance synthesis and describes the implemented algorithm for planar mechanical systems comprised of higher kinematic pairs. Input to the synthesis algorithm is a parametric model of the mechanical system with allowed parameter ranges (tolerance ranges). The model is specified as the part profiles consisting of line and arc segments and the motion axes along which each part moves. The algorithm analyzes tolerance in generalized configuration space, called contact zones bounding the worst-case variations, and identifies bad system variations. The bad system variations then are removed out of the parameter ranges by adjusting the nominal parameter values if possible and then shrinking the ranges otherwise. This cycle is repeated until no more bad variations we found. I show the effectiveness of the algorithm by case studies on several mechanisms.

• 한국자동차공학회논문집
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• 제9권1호
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• pp.20-27
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• 2001

A variable configuration tracked vehicle(VCTV) is developed to reduce turning energy and improve climbing ability for stairs. This mechanism has four track T-type frames. By changing the driving direction, each track T-type frame rotates to minimize the contact area with ground. It also has better performance than other VCTV in energy consumption of turning. Futhermore this mechanism is more stable than other VCTV on the rough terrain. When climbing stairs, each track T-type frame rotates to obtain a front attack angle and keep stability on steep stairs. The design parameters of components of track T-type frames are optimized to enhance the performance of climbing stairs. Performance indices include a stable angle, a climbing ability, a height of the vertical obstacle. In case that the overall length of the mechanism is 0.2m, it is required that the radius of the wheels should be 5mm and the length track contacted with he ground should be 0.09m to climb higher and steeper stairs.