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DiffServ 네트워크에서 공평성 향상을 위한 TRC Dropper의 성능 분석
김훈기,홍성화,Kim, Hoon-Ki,Hong, Sung-Hwa 한국시뮬레이션학회 2009 한국시뮬레이션학회 논문지 Vol.18 No.3
The average window size is most closely related to average throughput. In order to improve fairness, the proposed dropper tries to control the window size of each flow to equal level by intentional packet drop. Intentional packet drop is performed only to the flows that have been occupied bandwidth in a large amount. Because of intentional packet drop, this flow cut down its transmission rate to a half. Accordingly, somewhat capacity of core link comes into existence. And other flow can use this new capacity of this link. Hence other flows have more throughput than before. In this paper, we propose the TRC (Transmission Rate Control) Dropper improving the fairness between individual flows of aggregated sources on DiffServ network. It has the fairness improvement mechanism mentioned above paragraph.
컴퓨터 프로그래밍 언어 학습에서 집중학습프로그램(ILP)이 학습성과와 학습만족도에 미치는 영향
김훈기 ( Hoon-ki Kim ),박복남 ( Boc-nam Park ) 한국고등직업교육학회 2015 한국고등직업교육학회논문집 Vol.16 No.1
Purpose: The purpose of this study is to examine the effects of Intensive Learning Program(ILP) for learning performance and learning satisfaction on learning computer programming language. Methods: This research is conducted between June 23, 2014 and July 18, 2014 as a nonequivalent control group non-synchronized design. The subjects were 28 freshmen of a college students in Y-city area. The collected data are analyzed by using the SPSS-win 18.5 program. Result: The average of the total score for computer programming language's learning performance increased from 27.74±22.65 to 52.35±27.32 in the ILP group. The post- test scores for learning performance of the ILP group are significantly higher than that of the control group. Learning satisfaction's score was 3.34±.39 in the ILP group. Conclusion : ILP is effective in learning performance and learning satisfaction.
Analysis of Cladding Mode Effective Refractive Index in Optical Fiber
김훈기(Hoon-ki Kim) 한국산업응용수학회 2004 Journal of the Korean Society for Industrial and A Vol.8 No.2-1
The cladding modes are very important parameters to analyze and synthesize the optical fiber. The dispersion relation to obtain the cladding modes is more complicate than the one for the core mode with a two layer fiber problem because the dispersion relation for the cladding modes is a three layer fiber problem. In this paper, we derive the dispersion relation for the cladding mode proposed by Erdogan and show the simulation results.
Analysis of Core Mode Effective Refractive Index in Optical Fiber
김훈기(Hoon-ki Kim) 한국산업응용수학회 2005 Journal of the Korean Society for Industrial and A Vol.9 No.2-1
The core mode effective refractive indices are very important parameters to analyze and synthesize the optical fiber. Concretely, to solve the coupled mode equations that are a powerful tool for solving phenomena in optical fiber, the explicit expressions to obtain the core modes are needed. In this paper, we derive the dispersion relation for the core modes proposed by Erdogan and show the simulation results..
무선센서네트워크에서 LEACH 라우팅 프로토콜을 적용한 파티클 센서의 에너지 효율적인 알고리즘
홍성화,김훈기,Hong, Sung-Hwa,Kim, Hoon-Ki 한국시뮬레이션학회 2009 한국시뮬레이션학회 논문지 Vol.18 No.3
The sensor nodes that form a wireless sensor network must perform both routing and sensing roles, since each sensor node always has a regular energy drain. The majority of sensors being used in wireless sensor networks are either unmanned or operated in environments that make them difficult for humans to approach. Furthermore, since many wireless sensor networks contain large numbers of sensors, thus requiring the sensor nodes to be small in size and cheap in price, the amount of power that can be supplied to the nodes and their data processing capacity are both limited. In this paper, we proposes the WSN(Wireless Sensor Network) algorithm which is applied sensor node that has low power consumption and efficiency measurement. Moreover, the efficiency routing protocol is proposed in this paper. The proposed algorithm reduces power consumption of sensor node data communication. It has not researched in LEACH(Low-Energy Adaptive Clustering Hierarchy) routing protocol. As controlling the active/sleep mode based on the measured data by sensor node, the energy consumption is able to be managed. In the event, the data is transferred to the local cluster head already set. The other side, this algorithm send the data as dependent on the information such as initial and present energy, and the number of rounds that are transformed into cluster header and then transferred. In this situation, the assignment of each node to cluster head evenly is very important. We selected cluster head efficiently and uniformly distributed the energy to each cluster node through the proposed algorithm. Consequently, this caused the extension of the WSN life time.
홍성화(Sung-Hwa Hong),김훈기(Hoon-Ki Kim) 한국컴퓨터정보학회 2009 韓國컴퓨터情報學會論文誌 Vol.14 No.5
무선 센서 네트워크는 다양한 센서 기술의 발전으로 환경 분석이나 산업현자에서 다양하게 적용되고 있다. 또한 무선 센서 네트워크는 설치된 지역에서의 센서를 자동적으로 모니터링 한다. 특히 매우 작은 센서들은 최근환경 분석을 위해 보다 많은 전은을 요구하며 개발되고 있다. 이러한 이유로 보다 상세한 측정 방법을 위해 다양한 재료와 어플리케이션에 의해 개발되었다. 또한 센서노드들은 저가의 저전력을 요구하는 필드를 위해 적은 전원으로 동작한다. 전원 효율은 무선 센서 네트워크의 생존시간에 매우 중요한 요소이다. 때문에 센서 노드들은 복구되기 어렵고 광범위한지역에 설치된다. 본 논문에서는 저전력과 효율을 고려한 센서 노드에 적용된 무선 센서 네트워크 알고리즘을 제안하였다. Wireless Sensor Networks (WSN) can be applied to various industry fields and environment analysis fields with the progress of various sensor technologies. Also WSN help automatically monitoring of sensor nodes installed at wide area. Especially, the tiny sensor nodes recently developed for the environment analysis require much more electronic power. The reasons are the measurable fields are departmentalized and the more detailed measuring fields are created by the development of various materials and applications. Furthermore, the sensor nodes operated by small batteries for the fields require low cost and low power consumption in wireless networks technology. The power efficiency is the most important factor for the WSN life time. Because the sensor nodes are installed at wide area and hard to recover. This paper proposes the WSN algorithm is applied sensor node that has low power consumption and efficiency measurement.