• 한국공작기계학회논문집
• /
• 제13권2호
• /
• pp.54-60
• /
• 2004

There have been continuous efforts for developing the automatic mechanical design system to increase the efficiency of the tedious design process. However, these efforts have been concentrated on single platform application. Hence, the developed systems have been available only in a designated place and time and have been difficult to modify. In this study a web-based design system is developed to offer more reliability and convenience without my restriction of time and place. The developed system is programmed based on Java, and the architecture of the system has object-oriented features of Servlet and JSP and is independent on my operating systems. The developed system has been applied to the initial design of multi-stage gear drives, but as the framework of the developed system is however quite versatile, its application to automatic design of my mechanical system or evaluation can be easily expected.

• 한국항공운항학회지
• /
• 제21권2호
• /
• pp.7-14
• /
• 2013

In this paper, the optimal design of composite rotor blade cross-section is performed using a genetic algorithm. Skin thickness, torsion box thickness and skin lay-up angle are adopted as discrete design variables. The position and width of a torsion box are considered as continuous variables. An object function of optimal design is to minimize the mass of a rotor blade, and constraints are failure index, center mass, natural frequency and blade minimum mass per unit length. Finally, design variables such as the thickness and lay-up angles of a skin, and the thickness, position and width of a torsion box are determined by using an in-house program developed for the optimal design of rotor blade cross-section.

• 한국정보과학회:학술대회논문집
• /
• 한국정보과학회 2007년도 가을 학술발표논문집 Vol.34 No.2 (C)
• /
• pp.419-423
• /
• 2007

감시 및 보안의 중요성이 커지고 있다. 따라서 여러 대의 카메라로 움직이는 물체를 연속적으로 추적하는 효율적인 알고리즘 및 시스템에 대한 개발이 활발하다. 본 논문에서는 물체를 연속적으로 추적하기 위해 다중 카메라 간의 hand-off 기술을 제안한다. 먼저 움직이는 물체의 검출을 위한 몇 가지 단계의 전처리 과정을 거친다. 그리고 나서 검출된 영역들 간의 상관관계를 파악하기 위해 물체를 가장 잘 검출 한 주 카메라를 선택하고 이동 경로에 따른 다음 주 카메라를 예측한다. 예측된 카메라 정보와 칼라 정보 등을 이용해서 동일 물체를 추적하고 있음을 확인한다. 실험 결과는 움직이는 특정 물체에 대해 주 카메라가 어떻게 변해 가는지를 보여준다.

• Design & Manufacturing
• /
• 제2권2호
• /
• pp.20-24
• /
• 2008

Recently, the study for production technology is focused on cycle time reduction as various products are manufactured. In order to manufacture tool and die, rapid prototyping and rapid tooling are researched. Stereolithography apparatus, selective laser sintering, 3D printing, laminated object manufacturing are developed in rapid prototype. The purpose of this study is to develop rapid tooling technology using thermal spray process. This technology is not well-known to korea, but this study will be contributed in development of domestic molds industry through continuous research and development.

• Nuclear Engineering and Technology
• /
• 제43권1호
• /
• pp.45-62
• /
• 2011

The Korean nuclear industry is developing a thermal-hydraulic analysis code for safety analysis of pressurized water reactors (PWRs). The new code is called the Safety and Performance Analysis Code for Nuclear Power Plants (SPACE). The SPACE code adopts advanced physical modeling of two-phase flows, mainly two-fluid three-field models which comprise gas, continuous liquid, and droplet fields and has the capability to simulate 3D effects by the use of structured and/or nonstructured meshes. The programming language for the SPACE code is C++ for object-oriented code architecture. The SPACE code will replace outdated vendor supplied codes and will be used for the safety analysis of operating PWRs and the design of advanced reactors. This paper describes the overall features of the SPACE code and shows the code assessment results for several conceptual and separate effect test problems.

• 한국광학회지
• /
• 제15권5호
• /
• pp.405-408
• /
• 2004

나뉜 렌즈를 사용하는 스펙클 전단 간섭계로 전단링(shear)에 따라 변형을 가하지 않은 상태에서 물체에 대한 동일한 두 장의 스펙클그램 쌍들을 제작하여, 이중 스펙클 기법을 사용함으로서 전단량에 따라 이 전단간섭계의 측정한계를 구하였다. 이 측정한계는 기존의 방법으로 얻어지는 값과 잘 일치함을 알 수 있었다.

• 항공우주시스템공학회지
• /
• 제8권1호
• /
• pp.12-17
• /
• 2014

In this paper, optimal design of composite rotor blade cross-section to consider manufacturability was performed. Skin thickness, torsion box thickness and skin lay-up angle were adopted as discrete design variables and The position and width of a torsion box were considered as continuous variables. An object function of optimal design is to minimize the mass of a rotor blade, and various constraints such as failure index, center mass, shear center, natural frequency and blade minimum mass per unit length were adopted. Finally, design variables such as the thickness and lay-up angles of a skin, and the thickness, position and width of a torsion box were determined by using an in-house program developed for the optimal design of rotor blade cross-section.

• 소성∙가공
• /
• 제12권4호
• /
• pp.388-393
• /
• 2003

Electrolytic polishing is the anodic dissolution process in the transpassive state. It removes non-metallic inclusions and improves mechanical and corrosion resistance of stainless steel. Electrolytic polishing is normally used to remove a very thin layer of material from the surface of a metal object. An electrolyte of phosphoric acid 50% in vol., sulfuric acid 20% in vol. and distilled water 30% in vol. has been used in this study. In the low current density region, there can be found plateau region and material removal process and leveling process occur successively. In this study, an electrochemical polishing process using pulse current is adopted as a new electrochemical polishing process. In electrochemical machining processes, it has been found that pulse electrochemical processes provide an attractive alternative to the electrochemical processes using continuous current. Hence, this study will discuss the electrochemical polishing processes in low current density region and pulse electrochemical polishing.

• 상하수도학회지
• /
• 제30권5호
• /
• pp.597-604
• /
• 2016

This study was begun with the object of actively reflection the rapid technological advancements of the electronical control and mechanical control industries to sewage disposal methods. Or focuses on applying a flow control method that utilizes inverters and automatic valves to sewage treatment process systems. This study proposes that sewage treatment process systems architects must acquire a certain degree of technical skills in the areas of electrical and mechanical controls in order to raise the standard of completeness of sewage treatment process systems. And further emphasizes that there is required continuous research on automatics valves that are used in sewage treatment.

• 한국실내디자인학회논문집
• /
• 제29호
• /
• pp.257-264
• /
• 2001

To propose the construction of architectural interior design and communication using graphic, web3D, it was studied the kind and character of various representation methods that can be embodied in an architectural interior design on the web, and looks into whether these ways can be adapted to an architectural interior design process. Especially, the use of the current techniques on graphic and CAD data give the most suitable effect by using the integrated data such as vector animation, an interaction of object VR(Virtual Reality), a high quality of panorama VR, and data treatment and its interaction of drawing of cad data. As a result, the single data format shows not only one image representation but also a stream of continuous operation through a change into another format. But this desired study expects that another next studies will go on interaction and integration of digital format with increase of transmission speed expected in the future, and a digital model and its practical methods.