• 한국생산제조학회지
• /
• 제21권2호
• /
• pp.331-336
• /
• 2012

This study was aimed at the design of the dies for the guide valve for the fuel pressure regulator using the computer simulation to shorten the period of production, on the basis of the process planning which was designed by the field experts. In the computer simulation, 'Deform-3d' and 'Eesy-DieOpt' have been used, which are the commercial process analysis and die design program. Through the process analysis, we could know the propriety of the forming process, the inner pressure of the die and the suitable fitting pressure between the insert and the sleeve which was not showing any positive tangential stresses in the insert. Through the simulation of die design, we could know the number of the stress ring, the diameter ratios, the stresses of the die, the shrink fitting tolerance and temperature in the condition of the already determined maximum outer die diameter of the multi-stage former. The validity of the die design using the computer simulation was analyzed by the experiments and the results were satisfactory. As the results of this study, the new and easy die design system for multi-forging has been developed.

• 한국건축시공학회:학술대회논문집
• /
• 한국건축시공학회 2011년도 춘계 학술논문 발표대회 2부
• /
• pp.97-98
• /
• 2011

The number of high-rise buildings has increased year after year, with there currently being 5 projects in progress to construct buildings higher than 100 stories in Seoul alone. The construction cost for such high-rise buildings is significantly higher than the cost for a conventional low-rise building, while maintenance costs are expected to be two to three times higher. To reduce the maintenance cost of a high-rise building, there is the need for a guide rail to be used for maintenance, which is why there is the need for research on the guide rail system. For this reason, as preliminary research to develop a guide rail, this study aims to derive the factors increasing construction cost by taking the installation of a guide rail into account. This is expected to lay the groundwork for the design and construction of guide rails for high-rise building maintenance.

• 대한기계학회:학술대회논문집
• /
• 대한기계학회 2004년도 춘계학술대회
• /
• pp.444-449
• /
• 2004

The design modification of bottom guide structures of the instrumented capsule, which is used for the irradiation test in the HANARO reactor, was required because of the trouble of the bottom guide arm's pin during irradiation. The previous structure with 3-pin arms was changed into the cone shape of one body. The specimens of the bottom end cap ring with three different sizes (${\Phi}68/70/72mm$) were designed and manufactured. The out-pile tests for the capsule with previous and new three bottom guide structures were performed in the one-channel flow test facilities. In order to evaluate the compatibility with HANARO and the structural integrity of the capsule, a loading/unloading, a pressure drop, a thermal performance, a vibration, and an endurance test were conducted. From out-pile test results, the capsule with the cone shape bottom guide structures was found to be more stable than the previous structure and the optimized size of the bottom guide structure selected was 70mm in diameter. It is expected that the new bottom guide structures will be applicable to all material and special capsules which will be designed and manufactured for the irradiation tests in the future.

• 한국도로학회논문집
• /
• 제10권2호
• /
• pp.193-203
• /
• 2008

본 연구는 프리캐스트 콘크리트 슬래브를 이용한 급속 신설 도로 포장 공법의 국내 적용성을 분석하기 위한 기초 연구를 수행하고 시험시공을 통해 선설 프리캐스트 포장의 설계 및 시공 지침을 개발하기 위하여 수행되었다. 시험시공을 위해 가로, 세로, 깊이가 각각 실제 포장 슬래브의 1/2 크기인 슬래브를 설계하여 제작하였으며 이에 적합한 철근배근, 종방향과 횡방향의 연결부, 그라우팅 방법 등에 대하여 분석을 수행하였다. 이러한 슬래브를 이용하여 종방향과 횡방향으로 두 개씩 총 4 개의 슬래브를 연결하여 평탄성을 조절한 후 포켓 부분과 슬래브 하부의 공간을 그라우팅 함으로써 시공을 신속 용이하게 수행하였다. 시험 시공을 수행하며 프리캐스트 포장의 설계 및 시공과 관련된 세부 사항을 면밀히 분석하였으며 이에 바탕을 두어 프리캐스트 슬래브를 이용하여 급속하게 신설 도로를 건설할 때의 설계 및 시공 지침을 개발하였다.

• 한국항행학회논문지
• /
• 제17권4호
• /
• pp.442-448
• /
• 2013

제어계측 시스템과 정보시스템은 서로 차이가 있으며 두 시스템의 보안설계가 다르다. 이러한 문제점을 해결하기 위해 제어계측 시스템의 보안통제를 설계하기 위해서는 보안통제가이드를 기본으로 한 정책 설정 및 모델링 작업의 필요성이 대두되고 있다. 본 논문에서는 제어계측시스템 환경에서 사이버 보안 통제를 지원하기 위하여 보안규제 가이드를 기반으로 역할, 보안 통제 별 및 문서간의 관계스키마를 설계하였고, 설계된 스키마는 보안규제가이드를 준수하기 위한 사이버 보안 통제 구축 지원 시스템의 계획, 설계, 구현을 지원 하는 데이터베이스와 내용으로 활용이 가능하다. 이후 제안된 스키마를 활용하여 시스템 프로세스를 설계하고 제어계측 시스템에 최적화된 보안통제지원 시스템을 개발한다.

• 소성∙가공
• /
• 제24권5호
• /
• pp.340-347
• /
• 2015

Multi-pass shape drawing is used to manufacture long products of arbitrary cross-sectional shapes. This process allows smooth surface finishes and closely controlled dimensions of the cross-sectional shape. Tube shape drawing for hollow type products provides material savings and weight reduction. The intermediate die shapes are very important in multi-pass tube shape drawing. In the current paper, the design method for the intermediate dies in a tube shape drawing process is developed using a die offset for corner filling (DOCF) method. Underfill defects are related to the radial velocity distribution of each divided section in the deformation zone. The developed intermediate die shape design was applied to the two-pass tube shape drawing with fixed mandrel for manufacturing a hollow linear motion (LM) guide rail. The proposed design method led to uniform and steady metal flow at each divided section. FE-simulations and experiments were conducted to validate the effectiveness of the proposed method in multi-pass tube shape drawing process.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2006년도 추계학술대회 논문집
• /
• pp.527-528
• /
• 2006

• 한국항해항만학회:학술대회논문집
• /
• 한국항해항만학회 2002년도 춘계학술대회논문집
• /
• pp.235-239
• /
• 2002

In this study, a AGV(Auto Guide Vehicle) is presented and the dynamic characteristics of AGV driving device is investigated. The design factors of hydraulic pump and motor is an important component for it's performance characteristics. the dynamic characteristics of hydraulic pump and motor is simulated by using commercial code AMESim. Simulation results show that each behavior can be predicted with changing the various parameters.

• 디지털콘텐츠학회 논문지
• /
• 제9권1호
• /
• pp.117-124
• /
• 2008

본 연구는 사이버대학 가이드시스템에 대한 정보디자인적 접근을 통하여 사용자들이 학사제도 및 강의정보를 친근하고 쉽게 이용할 수 있도록 하고 이를 통해 대학의 학사과정이 보다 안정적이고 활발하게 운영되도록 하는데 필요한 요소를 논의하고자 한다. 따라서 본 연구에서는 기술과 소비자의 인식변화에 따른 가이드 시스템의 변화를 통하여 인지심리학 및 인간중심 커뮤니케이션 이론에 입각한, 미래 Web 2.0 시대에 적용될 가이드 시스템의 모습을 제시해 보고자 한다.

• Korea-Australia Rheology Journal
• /
• 제15권4호
• /
• pp.167-171
• /
• 2003

The backlight unit (BLU) is used as a light source of TFT liquid-crystalline-display (TFT-LCD) module. In this backlight unit, one of important components is the light guide, which is usually made of transparent polymers. Currently, the screen-printing method is mainly used for the light guide as a manufacturing process. However, it has limitation to the flexibility of three-dimensional optical design. In the present paper a new alternative manufacturing method for the light guide with low-cost is proposed. This manufacturing method is named as direct surface forming (DSF), which is very similar to the well-known hot embossing except for partial contact between mold and substrate. The results of this new manufacturing method are presented in terms of processing condition, dimensional accuracy, productivity, etc.