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부하 분산기법을 적용한 IOCP 모델의 MMORPG 게임서버 구현에 관한 연구
김기남(KiNam KIM),김혜영(Hye-Young Kim) 한국정보기술학회 2019 Proceedings of KIIT Conference Vol.2019 No.6
온라인 게임 중에서도 짧고 많은 패킷들이 발생하는 MMORPG 게임에서는 반응성을 중시하며 많은 데이터들이 송수신되기 때문에 비 연결지향형(Connectionless)의 웹서버가 아닌 TCP기반의 IOCP 서버를 사용한다. 하지만 IOCP서버라 할지라도 트래픽을 감당할 수 있는 한계는 명확하다. 본 논문에서는 WINDOW 기반 IOCP모델을 사용하여 서버를 구축하고 단일 서버에 대한 안정성, 신뢰성을 검증하고 단일 서버의 부하를 감소시키기 위해 서버 내 에이전트를 통한 로드밸런스 기능을 구현하여 테스트하고 그 결과들을 그래픽을 통해 시각화 하였다. In MMORPG games, where short and many packets occur during on-line games, responsiveness is important and many data are sent and received using a TCP-based IOCP server rather than a connection-oriented web server. However, the limits that IOCP gaming servers can handle traffic are clear. Therefore, a load balancing scheme was established through an agent in the gaming server and visualized through graphics in order to build a gaming server using the WINDOW-based IOCP model, verify reliability and reliability of a gaming server, and reduce the load of a gaming server.
히트파이프를 이용한 자동차 공조용 열교환기 통합에 관한 실험적 연구
김기남(Kinam kim),장종훈(Jonghoon Jang) 한국자동차공학회 2002 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2002 No.5_3
For an experimental setup, a copper-water heat pipe were used and the heat pipe was divided in three sections. An one end section was used as an evaporator and 2℃ cool water was circulated. The other end section was used as a heater core. The middle section was used as an air passage and air may be cooled or heated. For the various air flow rates, the inlet and outlet temperatures of air and cool water were measured and total heat balances were checked.<br/> The test results show that the differences between the inlet and outlet temperatures of the air and also those for the water were very small. It may recommend that in this experimental conditions water be used instead of air to have enough temperature difference. When the air flow rate is increased, the heat transfer rate also is increased. Much more study may be needed to verify the feasibility of using the heat pipe heat exchanger.
세계지리 시험 문항이 추동하는 지역 편견의 문제와 대안적 문항 구성 전략
김기남 ( Kinam Kim ),김민성 ( Minsung Kim ) 한국지리환경교육학회 2021 한국지리환경교육학회지 Vol.29 No.1
이 연구의 목적은 세계지리 시험 문항이 아프리카, 라틴아메리카 지역에 대한 구조화된 편견을 추동하는 방식을 살펴보고 균형 잡힌 시각 형성을 위한 대안적 문항 구성 전략을 개발하는 것이다. 해당 지역에 대한 편견을 살펴보기 위해 자연지리에서 열대 기후 지역으로 등질화, 열대 기후 지역의 인간 생활 문제를 사례로 제시하고, 인문지리에서 인구 및 도시화, 도시 문제, 라틴아메리카 인종 문제를 예시로 제시하였다. 나아가 아프리카, 라틴아메리카에 대한 인식을 개선하고 다양하고 역동적인 측면을 인지할 수 있도록 하기 위해 긍정적인 내용의 새로운 정보 제공, 지역 내 비교를 통한 역동성 이해, 개선되는 변화에 주목하는 지역 내변화 양상 탐색, 의외성을 지니는 경관 정보 제시에 기반한 대안적 문항 구성 전략을 제안하였다. 이러한 전략은 부정적인 관점으로 일반화되는 지역 편견에 반하는 내용을 제시하고 다양한 스케일에서 작동하는 지역의 역동성과 유연함을 문항 구성에 반영하려는 시도이다. The purpose of this study is to examine the ways in which world geography test questions drive structured prejudice against African and Latin American regions and to develop alternative question construction strategies for balanced perspective. To examine the regional prejudice, this study looked at the homogenization of tropical climate regions and human life in tropical regions as examples in physical geography, and population and urbanization, urban problems, and ethnic issues in Latin America as examples in human geography. Furthermore, this article presented the following strategies to improve awareness of Africa and Latin America and to make students aware of various and dynamic aspects of the regions: providing new information with positive content, understanding dynamics through regional comparisons, exploring changes that are focused on improving changes, and presenting unexpected landscape information. These strategies attempt to present content contrary to local prejudices that generalize to negative perspectives and to reflect the dynamics and flexibility of regions operating at different scales in the question construction.
도시철도용 구동기어의 설계 요소에 대한 소음 기여도 분석
김기남(Kinam Kim),이현철(Hyuncheol Lee),선찬웅(Chanwoong Sun),이성욱(Sungwook Lee) 한국소음진동공학회 2015 한국소음진동공학회 논문집 Vol.25 No.7
As the railway noise guideline of the Ministry of Environment after 2017 is strictly enforced, the noise level at stationary condition of urban railway is demanding the reduction about 2 dB(A). And the noise level at running condition is reduced by 6 dB(A) at 80 km/h. Therefore, the devices that causes noise shall arrange for the improvement plan of noise reduction for each device. In this paper, we carried out a technical review of the driving gear used to drive the vehicle from a variety of noise-induced equipment of a urban railway. Analyze the causes of the current noise levels and noise cause about the driving gear used in current urban railway and this study analyzes the noise level and noise cause the drive gear being used in the current urban railway. Finally, in this paper proposes a scheme for reducing the noise that can be designed to reduce the noise with considering the noise cause analysis.
김기남(Kinam Kim),장현목(Hyeonmog Jang),박영일(Yeongil Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
As the growing interests in train safety have recently expanded into a wide range of domestic railway industries. an appropriate system which can absorb collision energy effectively is being adopted when collision accidents happen in a train. A coupler system shall have an advanced construction to ensure passenger safety from collision accidents rather than a design approach to provide merely a connection between trains. In this study the verification scheme for collision analysis and results is investigated in order to design the coupler system for electric locomotive complying with requirements of Safety Notice for urban rail vehicle.