http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
라디칼 빔 보조 분자선 증착법 (Radical Beam Assisted Molecular Beam Epitaxy) 법에 의해 성장된 ZnO 박막의 발광 특성에 관한 연구
서효원,변동진,최원국,Suh, Hyo-Won,Byun, Dong-jin,Choi, Won-Kook 한국재료학회 2003 한국재료학회지 Vol.13 No.6
II-Ⅵ ZnO compound semiconductor thin films were grown on $\alpha$-Al$_2$O$_3$(0001) single crystal substrate by radical beam assisted molecular beam epitaxy and the optical properties were investigated. Zn(6N) was evaporated using Knudsen cell and O radical was assisted at the partial pressure of 1$\times$10$^{4}$ Torr and radical beam source of 250-450 W RF power. In $\theta$-2$\theta$ x-ray diffraction analysis, ZnO thin film with 500 nm thickness showed only ZnO(0002)and ZnO(0004) peaks is believed to be well grown along c-axis orientation. Photoluminescence (PL) measurement using He-Cd ($\lambda$=325 nm) laser is obtained in the temperature range of 9 K-300 K. At 9 K and 300 K, only near band edge (NBE) is observed and the FWHM's of PL peak of the ZnO deposited at 450 RF power are 45 meV and 145 meV respectively. From no observation of any weak deep level peak even at room temperature PL, the ZnO grains are regarded to contain very low defect density and impurity to cause the deep-level defects. The peak position of free exciton showed slightly red-shift as temperature was increased, and from this result the binding energy of free exciton can be experimentally determined as much as $58\pm$0.5 meV, which is very closed to that of ZnO bulk. By van der Pauw 4-point probe measurement, the grown ZnO is proved to be n-type with the electron concentration($n_{e}$ ) $1.69$\times$10^{18}$$cm^3$, mobility($\mu$) $-12.3\textrm{cm}^2$/Vㆍs, and resistivity($\rho$) 0.30 $\Omega$$\cdot$cm.
서효원(Hyo Won Suh),이현찬(Hyun Chan Lee),전홍배(Hong Bae Jun) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_2
Recently, customers for automobiles expect new models in a short life cycle. Therefore, is has been important to reduce the development lead-time. However, a traditional development system is not appropriate to meet these changes. Thus, Concurrent Engineering (CE)has been introduced to solve these problems as a key business strategy based on information technology. CE is a way of attaining three objectives simultaneously; reducing time to market, improving product quality, and lowering product costs.<br/> The purpose of this study is to recommend a CE strategy for improving the development process of Korean automotive industries. Thus, the key factors of CE and their effectiveness on the development processes are introduced, Based on that, the competitiveness of US and Japan automobile industries are analyzed, and the problems of development processes of Korean antomotive industries are investigated. Finally, a CE strategy for improving the problems are proposed.<br/>
함경준,서효원,양영순,최영,Hahm, Gyeong-June,Suh, Hyo-Won,Yang, Young-Soon,Choi, Young 한국전산구조공학회 2008 한국전산구조공학회논문집 Vol.21 No.6
협업 환경에서 각 에이전트는 같은 의미의 정보를 서로 다른 용어로 사용하기 때문에 정보공유의 어려움이 있다. 즉 협력 제품개발 환경에서 동일한 제품정보를 각 에이전트가 서로 다른 용어로 표현함으로써 제품정보 공유를 어렵게 만든다. 이러한 어려움을 해결하기 위해서는 의미기반 정보를 활용한 제품정보 공유 방법이 필요하다. 본 연구에서는 의미기반 제품정보 공유를 위해 온톨로지 기반의 의미검색 시스템 및 기존의 PDM시스템과 연계하는 방법을 제안한다. 온톨로지는 OWL기반으로 구축하고, 구축된 온톨로지로부터 Pellet 추론 엔진을 이용하여 의미검색을 가능하게 하며, 이것을 웹서비스를 기반으로 구현하여 다른 시스템에서 활용이 가능토록 한다. 또한 기존의 PDM과 연계하여 PDM을 기반으로 의미검색을 수행할 수 있는 방법을 제안한다. In collaborative environment, since each agent generally uses different words for the same meaning, there is an obstacle for information sharing. In collaborative product development environment, each agent has different words for representing same product information. As a result, it is hard to share product information in this situation. For solving this problem, semantic-based product information is needed. In this paper, a ontology-based semantic searching system which is able to interact with legacy PDM systems is proposed for product information sharing in collaborative environment Product ontology is represented with OWL format, and the product ontology is processed by Pellet reasoning engine for semantic searching. The system is implemented as a web service which can be integrated with other systems. This paper also introduces the approach with which a PDM system provides a function of semantic search with this search system.
Cybrid 가상플랜트 시스템 요구사항 분석과 개념적 설계
이재현(Jae Hyun Lee),서효원(Hyo Won Suh) (사)한국CDE학회 2015 한국CDE학회 논문집 Vol.21 No.2
Cybrid virtual plant concept is defined as a cyber plant mimicking a physical plant by using plant engineering data and sensor data coming from sensors attached to facilities of the physical plant. Cybrid virtual plant is a new concept for plant industry so that plant managers and operators’ requirements need to be captured for systematic application of the concept to the plant industry. The paper proposed an architecture of the cybrid virtual plant, and provided requirement analysis results for a specific plant company. A database, named smart-cube repository, for the proposed cybrid virtual plant is also proposed and its conceptual data structure is described.
엔지니어링 문서 처리능력 개선을 위한 도메인 온톨로지 구축 방법론 제안
윤병일(Byung-Il Yun),서효원(Hyo-Won Suh) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.하계
Because product information is complexity and increase, misunderstanding occurred in sharing information and reuse information. To solve this problem domain ontology is developed. Domain ontology represent concept and relation which belong to specific domain. But domain ontology construction depends on expert’s experience and knowledge thus requires a lot of cost and time. This study proposes automatic ontology construction method to solve the problem. This method build seed ontology by expert and expand it automatically to build domain ontology. This method rapidly with less cost to build the domain ontology.