• Transactions of Materials Processing
• /
• v.16 no.4 s.94
• /
• pp.239-243
• /
• 2007

Superplastic forming/diffusion bonding(SPF/DB) has been widely used in the automotive and aerospace industry since it has great advantages to produce very light and strong components. Finite element method(FEM) is used to model the SPF/DB process of 3-sheet sandwich panel to predict the pressure-time curve and to analyze the process parameters. In order to eliminate defects of the part, a new pressurization scheme is proposed. Contrary to the conventional one-step pressurization, which causes the folding at the DB joint, two-step pressurization can eliminate the folding. Effect of pressurization cycle was investigated by using FE analysis and proper pressurization cycle is proposed.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10b
• /
• pp.33-35
• /
• 1998

CALS가 성공하기 위해서는 임의의 기관 혹은 개인 사이의 정보 유통과 정보 공유가 가능해야 하며 이를 위해서는 정보의 형식 및 의미에 관한 표준이 필요하다. 본 논문에서는 이러한 표준 중 제품의 설계 및 생산 등 기술적인 정보를 다루는 STEP 표준을 기반으로 분산 객체 지향 미들웨어 기술과 웹 인터페이스 기술, mediator 기술 등의 활용하여 CALS 체계 구축을 위한 Engineering DB의 모델을 제시하고 이에 대한 prototype 구현을 소개한다.

• Proceedings of the Korean Society for Technology of Plasticity Conference
• /
• 2007.05a
• /
• pp.332-335
• /
• 2007

The superplastic forming (SPF) has been widely used in the automotive and aerospace industry because it has great advantages to produce very light and strong components. Finite element method (FEM) is used to model the process of superplastic forming/diffusion bonding (SPF/DB), to predict the pressure-time curve and to analyze the process parameter. In this study, process design of SPF/DB is carried out a 3-sheet sandwich part. SPF/DB process with pressure control was analyzed by using finite element method. For obtaining proper shape, step-by-step pressurization is proposed. The first step of SPD/DB process is obtained by applying of pressure in patches. From the next step it applied pressure to all regions (between inner sheets, between inner and face sheets). By using the proposed pressurization scheme, deficit in part shape is found to be eliminated.

• ICROS
• /
• v.1 no.2
• /
• pp.30-42
• /
• 1995

본 고에서는 요소기술 측면에서 DB 기술의 현황을 소개하고 CIM 응용사례를 기술한다. 2장에서는 DBMS의 일반적 기능과 데이타 모델의 발달에 따른 DBMS 기술의 발전에 대해 간략하게 기술하며, 3장에서는 최근 CIM, 멀티미디어 데이타 처리 분야에서의 비전통적인 DB 요구사항을 충족시키는 객체지향 소프트웨어 및 DB 패러다임에 대해 소개한다. 4장에서는 FMS의 운용 관리를 위한 객체지향 DB 구축사례에 대해 기술하며, 5장에서는 CALS에서 생산 데이타 교환 표준으로 채택하고 있는 ISO STEP 표준 DB구현 사례를 소개한다. 마지막으로 6장에서 결론을 기술한다.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 2000.04a
• /
• pp.310-313
• /
• 2000

본 연구에서는 STEP 표준을 고려하지 않고 설계·개발된 기존의 PDM 시스템이 CAD 시스템에서 생성된 STEP 포맷의 제품 데이터를 활용할 수 있도록 하기 위한 데이터 변환 방법을 제시하고자 한다. 이를 위하여 AP203 응용 프로토콜의 분석과 함께 스키마 매핑을 위한 방법과 절차를 제시하였다 그리고, 이를 바탕으로 AP203 스키마와 ‘중소기업형 PDM 시스템'의 DB 스키마간에 매핑을 설계하였다. 또한, CAD 시스템에서 생성된 제품의 Assembly 구조를 PDM 시스템의 BOM 구조로 변환하기 위한 알고리즘을 함께 제시하였으며, 제품의 product structure를 중심으로 데이터 변환을 위한 STEP-to-DB 변환기 프로토타입을 개발하였다. 그리고, CAD 시스템에서 생성된 제품 데이터에 대한 STEP 스키마 구조와 AP203 응용 프로토콜 스키마와의 구조적 차이를 비교·분석함으로서 CAD 시스템에서 생성된 STEP 포맷의 제품 데이터 구조에 대해 엔지니어링 데이터로서의 구조를 갖도록 하기 위한 기초 자료를 제공하였다.

• Proceedings of the Korea Contents Association Conference
• /
• 2004.05a
• /
• pp.535-539
• /
• 2004

This paper is concerned with structurizing contents of the ergonomic resources and constructing DB of these resources. Through this internet system developed using ultra 2 DB Server, Sun Solaris(UNIX) OS, UniSql DBMS, Apache Web server, the interface (www.gamsung.or.kr), by which ergonomic resources can be provided, has been completed. Information retrieval concerning ergonomic resources produced by the project "Business of Development in Technology of Human Sensibility Ergonomics" is possible. For example, 35 reports and 262 ergonomic characteristics issued from the first step of this project, 255 ergonomic characteristics issued from the second step. In addition, there are also voice data, sound data, expression data, questionnaire data, sensibility data, and information about researchers, manufactories, references.

• Proceedings of the Korean Vacuum Society Conference
• /
• 2012.08a
• /
• pp.211-211
• /
• 2012

Using spin-polarized density-functional theory calculations, we find that the existence of either Peierls instability or antiferromagnetic spin ordering is sensitive to hydrogen passivation near the step. As hydrogens are covered on the terrace, the dangling bond electrons are localized at the step, leading to step-induced states. We investigate the competition between charge and spin orderings in dangling-bond (DB) wires of increasing lengths fabricated on an H-terminated vicinal Si(001) surface. We find antiferromagnetic (AF) ordering to be energetically much more favorable than charge ordering. The energy preference of AF ordering shrinks in an oscillatory way as the wire length increases. This oscillatory behavior can be interpreted in terms of quantum size effects as the DB electrons fill discrete quantum levels.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.25 no.2
• /
• pp.219-226
• /
• 2017

This paper addresses the effective and quantitative image DB construction for the development of front looking camera systems. The automotive industry has expanded the capability of front camera solutions that will help ADAS(Advanced Driver Assistance System) applications targeting Euro NCAP function requirements. These safety functions include AEB(Autonomous Emergency Braking), TSR(Traffic Signal Recognition), LDW(Lane Departure Warning) and FCW(Forward Collision Warning). In order to guarantee real road safety performance, the driving image DB logged under various real road conditions should be used to train core object classifiers and verify the function performance of the camera system. However, the driving image DB would entail an invalid and time consuming task without proper guidelines. The standard working procedures and design factors required for each step to build an effective image DB for reliable automotive front looking camera systems are proposed.

• Journal of IKEEE
• /
• v.22 no.3
• /
• pp.729-732
• /
• 2018

This paper performs Agregation for supplementing the additional generator when reflecting the plan DB based on a number of renewable power sources, line and transformer data. In this study, modeling of a line and a generator through a Collector method and a Step-Up-Transformer among Aggregation execution methods is conducted.

• Proceedings of the Korean Operations and Management Science Society Conference
• /
• 1999.04a
• /
• pp.513-514
• /
• 1999