• Journal of Veterinary Science
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• 제22권6호
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• pp.66.1-66.9
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• 2021

Background: Maedi/Visna virus (MVV) is a contagious viral pathogen that causes considerable economic losses to the sheep industry worldwide. Objectives: In China, MVV has been detected in several regions, but its molecular characteristics and genetic variations were not thoroughly investigated. Methods: Therefore, in this study, we conducted next-generation sequencing on an MVV strain obtained from northwest China to reveal its genetic evolution via phylogenetic analysis. Results: A MVV strain obtained from Inner Mongolia (NM) of China was identified. Sequence analysis indicated that its whole-genome length is 9193 bp. Homology comparison of nucleotides between the NM strain and reference strains showed that the sequence homology of gag and env were 77.1%-86.8% and 67.7%-75.5%, respectively. Phylogenetic analysis revealed that the NM strain was closely related to the reference strains isolated from America, which belong to the A2 type. Notably, there were 5 amino acid insertions in variable region 4 and a highly variable motif at the C-terminal of the surface glycoprotein (SU5). Conclusions: The present study is the first to show the whole-genome sequence of an MVV obtained from China. The detailed analyses provide essential information for understanding the genetic characteristics of MVV, and the results enrich the MVV library.

• 한국ITS학회:학술대회논문집
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• 한국ITS학회 2002년도 제1회 정기총회 및 학술대회
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• pp.22-25
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• 2002

• 융합보안논문지
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• 제8권4호
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• pp.183-189
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• 2008

이메일은 언제 어디서나 실시간으로 전송될 수 있는 이점으로 인하여 그 역할이 증대되어 왔다. 하지만, 오늘날 이메일 보안 위협은 점차 지능적으로 특정 기관에 대한 공격으로 변화되고 있다. 이러한 상황에서 위협 대응에는 많은 한계가 있다. 따라서 이메일의 개념을 파악하고, 나날이 변화하는 정보기술 환경 변화속에서 발전되는 차세대 이메일 서비스 체게를 정립하고자 한다. 이를 토대로 이메일 환경에 대한 악의적 공격기술인 악성코드, 사회공학기법을 이용한 해킹 공격, 하이브리드 웜, 바이러스, 중요 메시지 갈취, 비인가된 계정 접근 등에 대한 정보를 수집하여, 공격 양상 변화 과정 파악 및 분류 체계를 정립하고 향후 변화 방향을 분석한다.

• 한국정보통신학회논문지
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• 제12권11호
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• pp.1947-1953
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• 2008

본 논문은 차세대 네트워크로 진화과정에서 IP기반의 실시간 서비스를 통합하는 차세대 통합네트워크를 위한 시험기시스템에 관한 연구내용과 결과를 제시한 것이다. 호 제어처리 및 데이터전달 체계의 연동을 위한 차세대통합 네트워크의 각 구성요소들의 프로토콜 기능과 처리능력의 시험기시스템 설계를 위한 효과적인 방안과 그 타당성을 논의한다. 그리고 시스템에 요구되는 기능별 블록을 추출하고, 각 기능블록간 동작흐름을 포함하는 상위 수준의 시스템 구조를 제안하고, 이에 기반한 시스템과 세부기능들의 설치 및 구현 결과를 제시한다.

• 디지털콘텐츠학회 논문지
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• 제8권4호
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• pp.425-430
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• 2007

본 논문에서는 주파수 자원의 고갈로 인하여 차세대 무선 정보통신으로 사용의 가능성이 예상되는 가시광 소자를 조명, 신호기, 전광표시, 표시 등에 이용하여, 발광효율의 가시 광 반도체가 조명이나 표시에 이용되어지는 경향이 있고 거기다 고속으로 점멸 가능한 능력을 갖는 것이나 이을 이용한 가시광 통신의 무선 통신에의 응용과 표준화 기술에 대하여 알아보고자한다.

• 전력전자학회:학술대회논문집
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• 전력전자학회 2013년도 추계학술대회 논문집
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• pp.117-118
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• 2013

Recent global warming to the promotion of electric vehicles (EV), plug-in hybrid (PEV), including the next generation of cars and solar power, wind power and other renewable energy, and next-generation power grid (smart grid) are getting attention. In addition, the system utilizes the battery life in the industry and the convenience of a variety of social systems, economics, environmental impact, and the inherent potential to change significantly, and you can not walk into a next-generation industrial strategy and the need increases more and more present, and its early commercialization In order to do this, as well as a key energy source, the battery charger for charging efficiency technologies is essential. In this paper, fast charge multiple battery modules and optional modules that can charge distribution charge will be introduced.

• 한국산업경영시스템학회:학술대회논문집
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• 한국산업경영시스템학회 2002년도 춘계학술대회
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• pp.51-56
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• 2002

A Korea next-generation high-speed rail system represents a typical example of large- scale multi-disciplinary systems, consisting of subsystems such as train, electrical hardware, electronics, control, Information, communication, civil technology etc. The system design and acquisition data of the large-scale system must be the subject under strict configuration control and management. The system therefore, must be developed using systems engineering that is a efficient and effective methodology to design such a complex system and manage its development. This paper presents the results from a computer-aided systems engineering application to the Korea next generation high-speed railway project. Especially, the focus of the study was on requirement management and PBS management.

• 한국경영과학회지
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• 제30권2호
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• pp.29-40
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• 2005

In this research, we propose packet scheduling algorithm considering different QoS characteristics of real-time traffic and non-real-time traffic in the next generation wireless communication system serving the multimedia traffic and a new efficient framing method cooperated with this packet scheduler. When the selected traffic classes of the selected users are transmitted, our proposed framing method can increase the number of serviced traffic classes by mixing the many different traffic classes within one frame considering data rate decided by the allocated AMC (Adaptive Modulation and Coding) option. Using this proposed method, the fairness among the traffic classes can be achieved and the system performance for total throughput and delay can be enhanced. Simulations are performed to analyze the performance of the proposed framing method. Our proposed packet scheduler and framing method will be applied to the next generation multimedia wireless communication system serving many traffic classes.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2000년도 Handout for 2000 Inter. Machine Tool Technical Seminar
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• pp.61-70
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• 2000

This paper described the current status of machine tool technology and its future trends with a particular emphasis on high-speed machining. People in machine tool industry have continuously sought to serve fast-changing manufacturing industry with economical machining solutins. At presents, it appears that more productivity gain is demanded to shorten time-to-market and machining requirements become more stringent. In this regard, this paper firstly addressed a high-speed spindle as a key element for the next-generation machine tools. The sequel to it apparently went to high-speed feed axes and final discussion included the problem of how to optimize overall system including servo function. Lastly a brief look to NC technology including machine intelligence was taken.

• Journal of Communications and Networks
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• 제8권4호
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• pp.475-479
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• 2006

In Korea, we witness vivid evidences of changing trend in communication that insist the emergence of new networking architecture. To accommodate the changing trend and to hold current strong position in global IT industry, Korea have launched broadband convergence network (BcN) initiative. BcN vision for Korea is to be the first in the world to realize converged network infrastructure and ubiquitous service environment. In this paper, we have introduced the concept and the vision of BcN with a viewpoint of a new paradigm to prepare future-proof communication environment. And then, we have disclosed BcN research and development (R&D) activities including R&D philosophy, R&D phases, and key technologies required. Also, we have discussed current development issues in three technology branches including service and control technology, unified transport technology, and next-generation access technology.