• 대한기계학회논문집A
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• 제27권10호
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• pp.1644-1652
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• 2003

The monitor product is packed by cushioning materials because the monitor can be broken during transportation. However, the addition of the cushioning material increased the volume of the product. Therefore, it is required that the usage of cushioning material be minimized. In practice, design engineers have followed the ad hoc design with experiences of predecessors. Automation of the design process is very important for the reduction of engineering cost, and can be achieved by an excellent design process and software development. According to Axiomatic design, a design flow is defined and a software system is developed for automated design. At first, a basic model is defined. A user can modify the model from menus and design is carried out according to the input from the user. Finite element models are automatically generated based on the design. A nonlinear finite element analysis program called LS/DYNA3D is linked for the impact analysis. The process of Design of Experiments using orthogonal array is installed to minimize the maximum acceleration in drop test. Therefore, a new design can be proposed by the system. The program is designed according to the Independence Axiom of Axiomatic design. FRs and DPs of the software system are defined and decomposed by zigzagging process. Independent modules can be generated by analysis of the full design matrix and each module is coded as class in Object Oriented Programming (OOP). Design results are discussed.

• 대한기계학회논문집A
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• 제26권5호
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• pp.851-863
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• 2002

Recent industrial requirements for highly precise shape processing have brought the electric discharge machining (EDM) in great need. High precision in EDM is primarily achieved by high performance controllers. However there exists inherent precision loss due to structural micro-deformation. On this background, we study structural deformation characteristics of wire cut EDM via finite element (FE) analysis and axiomatic design. Two different wire cut EDMs are selected as analysis models. 3D CAD package I-Deas is first used to construct FE models of wire cut EDMs, and then ABAQUS FE code is used for following structural analysis. Pertinency of FE mesh refinement is discussed in terms of η -factor. It is shown that performance accuracy of EDM depends strongly on the structural characteristics. Some design enhancements are suggested in an axiomatic design point of view. Finally we provide weight and temperature induced displacement discrepancies between wire end points as position functions of each subframe.

• 한국정밀공학회지
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• 제17권12호
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• pp.101-106
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• 2000

As the rotational speed of optical disk drive is increasing nowadays, the reliability to vibration and shock becomes more important. For this, various of rubber vibration isolators are being developed by varying the shape and hardness. But it is difficult for the hardness of common used rubber to be lowered below Duro 30 degrees, and because of the shape complexity of rubber vibration isolator there are difficulties of analysis. Microcellular foamed vibration isolator has various cell densities and cell sizes, so it can vary the stiffness and damping coefficient. In addition, its hardness can be lowered below Duro 30 degrees. Axiomatic Approach is very useful design method for designing new product or new process. Axiomatic Approach's character is scientific and analytical method. In this paper, developing process of microcellular foamed vibration isolator for DVD is presented with Axiomatic Approach.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2008년도 추계학술대회A
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• pp.1028-1033
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• 2008

The mount type HVAC control system is a type of an HVAC control system which is installed between a ceiling and ceiling boards of a room to control room temperature. Although the device is quite popular, design is conducted by a conventional way where engineering intuition and experiences are utilized. It is found that the design process is fairly inefficient and time-consuming because there are a lot of feedbacks. The axiomatic approach is used to investigate the design characteristics of the mount type HAVC control system and the Independence Axiom is utilized for the investigation. The Overall hierarchy is established up to the level of parts. It is found that the current design has many coupled and redundant aspects. The hierarchy is reorganized based on the Independence Axiom and a new design process is found. To exploit the new design process in practice, a design manual is made.

• 대한기계학회논문집A
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• 제25권4호
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• pp.637-644
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• 2001

Polymer materials have a lot of merits including the low cost and the easiness of forming. For these reasons they are widely using at many manufacturing industries. Microcellular foaming process appeared at MIT in 1980s to save a quantity of material and increase mechanical properties. There are many process variables in appling microcellular foaming process to the conventional injection molding process. They can be solved by using Axiomatic Design Method which is very useful design method for designing a new product. Its main character is scientific and analytical. The information about the thickness of cavity plays an important role in making an effective foam. The goal of this research is to design mold system for advance of foaming magnitude with axiomatic design method. There is a relation between the change of cavitys thickness and foaming magnitude made after inserting a gas. R/t is a conception that indicate proportion between radius and thickness of cavity in mold system. By means of SEM observation of side surface of cavity sample, foaming magnitude of polymer in microcellular foaming process is decreasing gradually as the value of R/t is increasing. In this paper, an advanced mold system was presented by mapping the relation between functional requirements and design parameters.

• 대한기계학회논문집
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• 제9권5호
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• pp.647-654
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• 1985

본 논문에서는 미소한 비대칭 요소를 갖는 축대칭 셸구조물(종형구조물 또는 용접된 압력용기등)의 전산기 이용 도면입력/수정/출력, 체적특성치의 자동결정, 근사 고속 유한요소해석 및 출력을 시각화하는 일관 작업을 수행할 수 있는 전산기이용설계 알고리즘을 개발하고 생산가공에 대한 공리적 접근방법을 전산화하는 전산기이용 공정 계획 알고리즘에 대한 기초적인 연구를 행하였다.

• 대한지리학회지
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• 제44권3호
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• pp.372-394
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• 2009

본 연구는 온톨로지 기반 시민참여형 GIS를 연구하였다. 최근에 온톨로지 기반 GIS는 의미적 의사소통을 위한 지리적 변수의 폭넓은 활용성과 유용한 지리적 지식을 추천하기 위한 수요에 따라 주목받고 있다. 그래서 이 연구는 시민참여형 GIS를 위한 실험적 시스템의 설계와 구현에 초점을 맞추었다. 실험적 시스템의 적용 가능성은 경기도 구리시의 역사관광을 대상으로 실험을 통해 확인하였다. 방법론 측면에서 지역상황과 사용자 인식에 연관된 생명주기모형은 공리를 통해 지리적 지식발견을 추천하고, 이는 주요한 사전절차단계(명세화, 개념화, 정규화, 통합과 구현)를 통해 가능하다. 이 연구의 온톨로지는 실용적 측면에서 추론을 통한 지리적 지식을 추천하였다. 더불어, 이 연구의 온톨로지 기반 시민참여형 GIS는 인식론적 접근과 존재론적 접근의 통합을 보여주고, 의미론적 의사소통과 연계된 지표를 제공하였다는 것에 의미가 있다. 실험적 시스템의 결과는 연구지역에서 시나리오의 형태로 적용하고, 이 모델은 인간 활동의 의미에서 논리적인 제약요소의 공리를 활용하였다.

• 한국자동차공학회논문집
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• 제7권6호
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• pp.106-114
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• 1999

Today, one of the most important objective in automobile development is to reduce the weight of automobile . The eventual depletion of petroleum and environmental regulations brought considerable emphasis to this area on increasing fuel efficiency. Conventional intake air-fuel system is very heavy because it is composed of numerous parts. The bulky size caused increase in the amount of metal being used to build automobile chassis and this became a serious weight problem. The size also caused difficulties in optimization of fuel supply system which in turn decreased engine efficiency. Currently , there are efforts to integrate several intake system modules into one. The purpose of this paper is to evaluate the directions of such development.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2007년도 춘계학술대회 논문집
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• pp.593-594
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• 2007

• 대한기계학회논문집A
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• 제37권2호
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• pp.193-198
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• 2013

제품은 하나 이상의 부품으로 구성되어 있으며, 제품을 구성하는 부품들은 같은 기능을 갖는 경우도 있다. 부품통합설계 가설에 의하면 같은 기능을 하는 부품은 하나의 부품으로 통합될 수 있다. 제품을 구성하는 부품은 하나 이상의 기능을 가지고 있는 경우가 있으며, 부품의 형상 자체가 기능이 되거나 부품의 재질이 갖는 특성이 기능이 되기도 한다. 본 논문에서는 부품이 가지고 있는 기능을 정의하는 방법을 제시하고, 제시된 방법에 의하여 확인된 부품의 기능들 중에서 동일 기능을 갖는 부품을 통합하는 방법을 제시하였다. 또한 제시된 방법을 이용하여 종이에 구멍을 뚫는 3 공 천공기를 구성하는 부품들을 통합해 보았으며 그 결과는 공리적 설계를 만족하였다.