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超傳導 交流 發電機의 電磁 遮蔽 效果에 관한 有限 要素 解釋
南基讚,韓聲鎭,周秀元 동아대학교 공과대학 부설 한국자원개발연구소 1992 硏究報告 Vol.16 No.1
This paper deals with the magnetic shielding effects in the superconductiong a. c. generator using finite element method. Models of three different shields are studied to compare the magnetic shielding effects. Applying 3 phase ac source to the armature, the magnetic flux densities are calculated for directions and frequencies. Because the stability of the superconducting field winding depends on the screening of the magnetic fields, computed results should be used to design the electromagnetic shield of the superconduction generator.
박기남,김영찬 한밭대학교 정보통신전문대학원 2005 정보통신전문대학원 논문집 Vol.3 No.1
최근 들어 소프트웨어 개발 언어에서는 객체지향 언어(JAVA, C# 등)들이 점차 주목을 받고 있다. 하지만 대부분의 영구 데이터 저장 장소로 관계형 데이터베이스(RDB)를 사용하고 있고, 이에 따라 관계형 데이터베이스와 객체지향 언어를 같이 사용하기에 많은 어려움이 따르며, 관계형 데이터를 객체형 데이터로 바꾸는데 많은 개발 시간을 요하게 된다. 이와 같은 문제점을 해결하기 위하여 관계형 데이터와 객체형 데이터 간의 변환을 지원하기 위한 많은 프레임워크(Hibernate, JDO, Castor 등)들이 속속 등장하였다. 본 논문에서는 객체관계 프레임워크(ORM Frameworks)중에서 Hibernate를 사용한 Pet Store와, EJB를 사용한 Pet Store를 구현하여 각각의 Database Access속도와, 코딩양들을 비교 분석 하여 본다. Object-oriented languages such as C++, Java or C# are getting attention gradually as software development languages recently while relational databases which have been around since the 1960s have remained as primary databases. Writing an object-oriented application that stores data in a relational database set developers up for a large maintenance burden because there is an impedance mismatch between object model and relational model. To alleviate such problem, it is recommended to use the persistent framework. The persistent frameworks can allow developers to map normal objects to relational tables with minimal effort. As a result, a lot of frameworks such as Hibernate, JDO, and EJB appeared successively. In this paper, we benchmark the Hibernate and EJB frameworks using Java Pet Store which is a de facto reference implementation provided by Sun.
( Dam Kim ),( Soo-kyung Cho ),( Seoung Wan Nam ),( Hyuk Hee Kwon ),( Sun-young Jung ),( Chan Hong Jeon ),( Seul Gi Im ),( Dalho Kim ),( Eun Jin Jang ),( Yoon-kyoung Sung ) 대한류마티스학회 2017 대한류마티스학회지 Vol.24 No.5
Objective. To estimate the cardiovascular (CV) and gastrointestinal (GI) risks of etoricoxib in the treatment of osteoarthritis (OA) compared to a placebo and other non-steroidal anti-inflammatory drugs (NSAIDs). Methods. A systematic review of randomized, controlled trials (RCTs) of etoricoxib were performed. Bayesian network meta-analysis was used over a duration of 12 weeks. The incidence of CV and GI events for a duration ≥26 weeks were also tabulated and presented using descriptive statistics. Results. From this search, 10 studies were identified. Of these, 6 and 5 RCTs that measured the CV and GI events at 12 weeks were included in meta-analysis. They showed that etoricoxib did not increase the CV events compared to the placebo or NSAIDs during the 12 week period (odds ratio [OR]=0.59 compared to celecoxib, OR=0.89 with ibuprofen, OR=0.70 with placebo, and OR=2.16 with naproxen). The risk of GI events was comparable to that of most comparators, with the exception of naproxen, which had a significantly lower risk of GI events (OR=0.18) during the 12 week period. For a duration ≥26 weeks, the incidence of CV and GI events with etoricoxib increased with increasing duration. Conclusion. Etoricoxib is an alternative short-term treatment option for OA, showing comparable CV and GI complications to other NSAIDs. Nevertheless, further studies will be needed to elucidate the long-term safety of etoricoxib in the treatment of OA. (J Rheum Dis 2017;24:293-302)
Network Neutrality Debate: an End User`s Perspective
( Chan Gi Nam ),( Hong Kyu Lee ),( Seong Cheol Kim ),( Tae Hee Kim ) 정보통신정책학회 2011 정보통신정책연구 Vol.18 No.1
Network neutrality has recently become a major issue in the telecommunications industry as the demand for services which need more bandwidth have continued to grow. It is frequently argued that network neutrality is necessary to guarantee fair competition, continuous innovation among contents and application providers and to protect access by end users to network. However, network operators argue that it may reduce the incentive to upgrade their networks, and thereby a high quality of services (QoS) may not be guaranteed. Although network neutrality is a controversial issue that can affect the interests of a wide range of stakeholders, previous studies have only focused on the debate between network operators and contents and application providers, without taking into consideration of end users who are one of the most important stakeholders. This paper attempts to review the network neutrality debate from the perspective of end users by examining which attributes they prefer in broadband Internet services. The results imply that Internet access speed is the most important factor and that a user-oriented approach may reduce conflicts between network operators and contents and application providers.
Article : Prediction Model of Post-merger Performance
( Chan Gi Nam ),( Yun Taek Pae ),( June Suh Yi ) 한국금융학회 2008 금융연구 Vol.22 No.4
This study develops a comprehensive model describing the post-merger performance of a combined firm based on a fundamental ROE equation. The model suggests that post-merger performance is an exponential function composed of relative size, price to book ratio, synergy, cost of equity and book value change, rather than a simple linear combination of factors. In addition, the model addresses relative size effect, market valuation effect, premium, and merger wave, which are consistent with previous studies. Empirical tests are also provided to show the effectiveness of the model for measurement of the post-merger performance.
AHP를 이용한 전자상거래 업체의 택배업체 선정 기준에 관한 연구
남찬기(Chan-gi Nam),김병래(Byung-rae Kim) 한국인터넷전자상거래학회 2003 인터넷전자상거래연구 Vol.3 No.1
E-commerce is an expanding business area due to the significant development of Cable TV and Internet shopping malls. With the increase in the number of the shopping malls, small package express service market has also grown very rapidly. Shopping malls and vendors involving in e-commerce demand a high quality delivery service for their customers, and small package express service providers try to meet the demands. Thus, how to choose the right small package express service provider is one of the important factors to the successful business in the area of e-commerce.<br/> The purpose of this study is to find important hierarchy-factors, which affect the e-commerce firms to choose the small package express service providers. Using AHP method and survey data, we find out the factors which are considered to be important in the choice of the right small package express service provider. The relative importance of the factors is ordered by low cost, accurate and rapid delivery, respectively.<br/> The results of this study might provide some implications to small package express service providers to attain superiority over competitors.