• 대한치과기공학회지
• /
• 제42권4호
• /
• pp.307-312
• /
• 2020

Application of ceramic materials for fabrication of dental restoration materials has been a focus of interest in the field of esthetic dentistry. The ceramic materials of choice are glass ceramics, spinel, alumina, and zirconia. The development of yttrium tetragonal zirconia polycrystal (YTZP)-based systems is a recent addition to all-ceramic systems that have high strength and are used for crowns and fixed partial dentures. Computer-aided design/computer-aided manufacturing (CAD/CAM)-produced, YTZP-based systems are popular with respect to their esthetic appeal for use in stress-bearing regions. The highly esthetic nature of zirconia and its superior physical properties and biocompatibility have enabled the development of restorative systems that meet the demands of today's patients. Many in vitro trials have been performed on the use of zirconia; however, relatively fewer long-term clinical studies have been published on this subject. The use of zirconia frameworks for long-span fixed partial dentures is currently being evaluated; in the future, more in vivo research and long-term clinical studies are required to provide scientific evidence for drawing solid guidelines. Further clinical and in vitro studies are required to obtain data regarding the long-term clinical use of zirconia-based restorations.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2006년도 추계학술대회 논문집 전기기기 및 에너지변환시스템부문
• /
• pp.152-154
• /
• 2006

This paper presents an electric power control scheme in the transmission line using a UPFC(Unified Power Flow Controller). From the practical application viewpoint, the simultaneous realization of the power response desired. The author propose a new power control algorithm for UPFC. To verify the effectiveness of the proposed algorithm, a protype inverter is built and some experiments are carried out.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 1993년도 춘계학술대회 논문집
• /
• pp.359-364
• /
• 1993

As advanced method for the automatic generation of parametric models in computer-aided design systems is required for most of two-dimensional model which is represented as a set of geometric elements, and constr- aining scheme formulas. The development system uses geometirc constrainis and topology parameters which are derived from feature recognition and grouping the design entities into optimal ones from pre-designed drawings. The aim of this paper is to present guidelines for the application and development of parametric design modules for the standard parts in mechaniscal system, the basic constitutional part of mold base, and other 2D features.

• 한국지반공학회:학술대회논문집
• /
• 한국지반공학회 1990년도 PROCEEDINGS OF THE FIRST KOREA-JAPAN JOINT GEOTECHNICAL SEMINAR ON EXCAVATION and TUNNELING IN URBAN AREAS
• /
• pp.9-24
• /
• 1990

Most tunnels in soft soils in urban areas are constructed by shield tunnelling method for environmental reasons. Ground surface settlements are caused by shield tunnelling so that auxiliary measures are often required. Simple methods to predict ground surface settlement are given. The use of the slurry or the earth pressure balance shield machine and the application of new methods of grouting with computer aided operation control systems decreases the ground surface settlement to 3 mm. The construction cost of tunnels is almost identical whichever type of shield machine is employed according to a statistical investigation.

• 대한인간공학회지
• /
• 제1권1호
• /
• pp.29-34
• /
• 1982

Traditional methodologies for ergonomic evaluation are too laborious to be accepted broadly. CAD flex- flexibility and its ease can be a key to breaking this barrier. In this paper, a biokinematic modelis suggested for interactive computer aided ergonomic evaluation. Model parameters are derived and validated by regression analysis. This model showes more flexibility than the stick and joint models. An application is presented to show the clarity of this approach.

• 산업기술연구
• /
• 제27권A호
• /
• pp.39-46
• /
• 2007

I discuss the preliminary version of an investigative software, GSE, - Genetic 3D Surface Explorer, in which genetic operations interact with AutoCAD to generate novel 3D Forms for the Architect. GSE allows us to comment on design issues concerning computer aided design tools based on evolutionary algorithms.

• 한국정밀공학회지
• /
• 제10권4호
• /
• pp.236-247
• /
• 1993

An davanced method for the automatic generation of parametric models in computer- aided design systems is required for most of two-dimensional model which is represented as a set of geometric elements, and constraining scheme formulas. The development system uses geometric constraints and support of topology parameters from feature recognition and grouping the design entities into optimal ones from pre-designed drawings. The aim of this paper is to present guidelines for the application and development of parametric design modules for the standard parts in mechanical system, the basic constitutional part of mold base, and other 2D features.

• 한국학교수학회논문집
• /
• 제4권2호
• /
• pp.1-9
• /
• 2001

Since the computer is becoming more and more indispensible tool in every fields of the modern society, it is needed and desirable to utilize the computer as a basic tool from the very early stage of the education process. Recently Maple is gaining its popularity as a comprehensive mathematical software with its power of symbolic calculations and graphics as well as its great numerical computational ability. We demonstrate the suitability of this software as a tool for the mathematical education and presents several examples of the applications of Maple. For the middle and the high school mathematics courses, we give the application examples for the quadratic functions and their graphs, statistics, the three dimensional shapes, algebraic problems. Through the examples, we confirm that mathematical education can be much more effective and simple by using Maple. If we establish computer-assisted mathematical classes, we can draw more attention and excitement from the attendants than traditional classes and eventually improve more rapidly their problem-solving ability On the other hand, the excess of the computer-aided education give to obstacle of psychological, not to be passing over the fact.

• 한국자동차공학회논문집
• /
• 제18권5호
• /
• pp.45-49
• /
• 2010

The automotive industry has shown a growing interest in tube hydroforming during the past years. The advantages of hydroforming (less thinning, a more efficient manufacturing process, etc.) can, for instance, be combined with the high strength of extra high strength steels, which are usually less formable, to produce structural automotive components which exhibit lower weight and improved service performance. Design and production of tubular components require knowledge about tube material and forming behavior during hydroforming and how the hydroforming operation itself should be controlled. These issues are studied analytically in the present paper. In this study, the whole process of rear sub-frame parts development by tube hydroforming using AA6061 material is presented. At the part design stage, it requires feasibility study and process design aided by CAE (Computer Aided Engineering) to confirm hydroformability in details. Effects of parameters such as internal pressure, axial feeding and geometry shape in automotive rear sub-frame by hydroforming process were carefully investigated. Overall possibility of hydroformable rear sub-frame parts could be examined by cross sectional analyses. Moreover, it is essential to ensure the formability of tube material on every forming step such as pre-bending and hydroforming. In addition, all the components of prototyping tool are designed and interference with press is examined from the point of geometry and thinning.

• 디자인학연구
• /
• 제11권
• /
• pp.84-93
• /
• 1995

최근 들어 디자인 문제가 고도로 복잡화되어 감에 따라 제품의 디자인도 제품개발이라는 이름으로 관련 학문들과 통합화 경향을 보이고 있으며 협동 작업화 되어 가고 있다. 이와 아울러 이러한 협동작업과 통합화된 프로세스에 대한 컴퓨터의 응용 또한 본격적으로 진행중이다. 이에 본 논문은 최근 제품개발과 관련지어 일어나고 있는 다양한 환경의 변화를 살펴보고 이에 대한 컴퓨터 응용 현황을 분석해봄으로써 디자인 협동작업을 위한 기초적 틀을 마련하는 것을 그 연구 목적으로 하였다. 연구의 진행은 우선 디자인 프로세스의 발달 과정을 살펴봄으로써 디자인에 있어서 그 그룹 협동작업의 중요성을 밝힌 다음 제품개발에 있어서의 통합화 경향과 협동작업을 동시공학과 QFD의 경우를 들어 예시하였다. 이어서 제품개발의 통합화된 그룹 협동작업을 위한 컴퓨터 응용 연구 현황을 블랙보드 시스템과 제품의 형태창출 시스템을 통하여 파악한 후 디자인을 위한 컴퓨터 지원 협동작업을 기본적 연구 방향을 사례를 들어 나타내었다. 끝으로 금후 컴퓨터 지원 디자인 협동 작업 시스템 구축을 위한 연구 과제를 제시하였다