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파원사열와 그 원내조사 : 환경분위기속에서 조업한 장치를 중심으로
김철중,신명철,맹선재 한국부식학회 1977 Corrosion Science and Technology Vol.6 No.1
環境雰圍氣속에서 操業시킨 裝置 및 化學裝置 몇 개에 대한 破損原因調査事例를 紹介하였다. 染色用 tank의 stainless steel tube와 bar의 경우 用水處理不良과 加工 및 熔接에 의한 內部應力이 破損의 原因이었으며 裝置의 構造上에도 問題點이 있었다. Exchanger tube의 破損은 crude 속의 sulfur와 熱疲勞가 原因이었으며 boiler tube의 경우는 用水處理不良으로 因한 溶存酸素와 높은 濃度의 鹽化物이 原因이었다. Naptha 分解爐 U-bend tube의 破損은 過熱이 原因이었다.
김철중,임만호 한국유통경영학회 2009 유통경영학회지 Vol.12 No.4
Nowadays enterprises require human resources who have not only simple technology but also the ability to solve problems, think creatively, and study continuously are regarded as an essential capacity of enterprise. To fulfill these social needs, this study considers university education in the view point of service with service concept and analysis method of enterprise. This study analyzes student's response to lecturers, applying service quality and HRD analysis. Also, existing secondary data and raw data from research are analyzed. In short, this research convinces the importance of service quality, indicating positive(+) relations with student's satisfaction. In case of HRD factors, Education and Training area (T&D) and Area of Counseling and Human Relations are marked as negative(-) effects, but Learning zone and management area are marked as positive(+) relations. Thus, HRD indicates both positive and negative relations. Although there are slight differences among them, all factors are research objects. Each item affects student's results in case of education service. As a result, universities select and concentrate on what is appropriate for their situation. Nowadays enterprises require human resources who have not only simple technology but also the ability to solve problems, think creatively, and study continuously are regarded as an essential capacity of enterprise. To fulfill these social needs, this study considers university education in the view point of service with service concept and analysis method of enterprise. This study analyzes student's response to lecturers, applying service quality and HRD analysis. Also, existing secondary data and raw data from research are analyzed. In short, this research convinces the importance of service quality, indicating positive(+) relations with student's satisfaction. In case of HRD factors, Education and Training area (T&D) and Area of Counseling and Human Relations are marked as negative(-) effects, but Learning zone and management area are marked as positive(+) relations. Thus, HRD indicates both positive and negative relations. Although there are slight differences among them, all factors are research objects. Each item affects student's results in case of education service. As a result, universities select and concentrate on what is appropriate for their situation.
이동 애드혹 네트워크에서 이웃노드 정보를 이용한 AODV 라우팅 프로토콜의 설계 및 평가
김철중,박석천,Kim, Cheol-Joong,Park, Seok-Cheon 한국정보처리학회 2008 정보처리학회논문지 C : 정보통신,정보보안 Vol.15 No.3
A MANET is an autonomous, infrastructureless system that consists of mobile nodes. In MANET, on-demand routing protocols are usually used because network topology changes frequently. The current approach in case of broken routes is to flag an error and re-initiate route discovery either at the source or at the intermediate node. Repairing these broken links is a costly affair in terms of routing overhead and delay involved. Therefore, this paper propose a NAODV(Neighbor-aware AODV) protocol that stands on the basis of an AODV. It sets up the route rapidly if it operates for setting the route directly by using sequence number of neighbor nodes without re-search the route when the route to destination node is broken. Also, it reduces loss of packets. We use NS-2 for the computer simulation and validate that the proposed scheme is better than general AODV in terms of packet delivery ratio and average end-to-end delay. Also, when the proposed protocol is applied to the large ad-hoc network with multiple nodes, the performance is more efficient. 이동성을 가진 다수의 노드들로 구성된 MANET에서는 네트워크 토폴로지의 빈번한 변화에 효과적으로 대응할 수 있는 온디맨드 방식의 라우팅 프로토콜이 주로 사용된다. 기존의 AODV 라우팅 기법에서 목적지 노드가 local repair 지역을 벗어나서 이동하고 있을 때, local repair 방법은 불필요한 시간지연을 가져다 줄 뿐이며, 이러한 local repair 방법으로 인한 시간지연은 전체적인 라우팅 경로의 설정시간을 오래 걸리게 할 뿐 아니라, 생성된 데이터 패킷의 손실을 증가시키는 문제를 가져온다. 따라서 본 논문에서는 목적지 노드까지의 경로 단절시 출발지 노드로 가서 경로 재탐색을 하지 않고 이웃 노드의 순서번호를 이용하여 직접 경로설정을 위한 동작을 할 경우 보다 신속하게 경로를 설정할 수 있으며, 데이터의 패킷 손실도 줄여 줄 수 있는 AODV 기반 효율적인 라우팅 프로토콜인 NAODV 프로토콜을 제안하였다. NS-2를 이용한 시뮬레이션 결과는 제안한 기법이 기존의 AODV 보다 패킷 전달비율, 지연시간 측면에서 향상된 성능을 제공함을 보여준다. 또한 노드의 이동 속도가 빠르고 대형망으로 갈수록 더욱 효과적인 방법임을 확인하였다.
金喆中 弘益大學校 1982 弘大論叢 Vol.14 No.1
The purpose of this paper is to explain the idea of Investment Decision Using β Coefficient. The theoretical framework is briefly summarized first, and then there are some computation examples of this idea. The condition that must hold if the project is to be acceptable is as follows. E(R^o_j)>R_f+[E(R_m)-R_f)β^o_j E(R^o_j) : Return on an individual project. R_f : Risk-free interest rate. E(R_m) : Return on the market. β^o_j : coefficient of an individual project. One great practical advantage of the market price of risk criterion is that all but one of its statistical factors are market constants, applicable to all firms and to all projects. But, because market price data are not available either for individual projects, the problem in this idea is the calculation of the betas for individual projects.