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하이브리드 셋업을 이용한 에너지 효율적 센서 네트워크 클러스터링
민홍기,Min, Hong-Ki 한국융합신호처리학회 2011 융합신호처리학회 논문지 (JISPS) Vol.12 No.1
센서 네트워크에서 사용되는 동적 클러스터링 방식은 주기적으로 클러스터 구조가 바뀌는 셋업과정으로 인한 에너지 소모가 크다. 셋업과정은 보안적용을 해야 할 경우 보안 키가 주기적으로 재 생성되는 등 클러스터 구성 이외에 추가적인 에너지 낭비가 발생한다. 본 논문은 최초에 구성된 클러스터 알고리즘과 이후 반복적으로 발생되는 클러스터 재셋업 알고리즘을 달리하는 하이브리드 방식을 제안한다. 재 셋업에서는 고정된 클러스터 내에서 순환적으로 클러스터 헤드노드를 선출하는 순환적 클러스터 헤드선정(RRCH: Round-Robin Cluster Header)방식을 이용하여 에너지 소모를 줄인다. 보안키 생성 및 적용으로 추가되는 에너지 소모는 클러스터가 지속적으로 고정되기 때문에 최초 클러스터 형성 때 사전 배포하는 방식으로 해결된다. 본 논문에서 제안한 방식의 타당성을 확인하기 위해 모의실험을 실시하였다. 라운드 구간을 100번 반복하여 클러스터 구성과 데이터 전송을 포함한 전체 에너지 소모량을 측정하였다. 결과는 제안한 방식이 LEACH방식보다 평균 26.5%, HEED방식보다 평균 20% 적게 소모되는 것을 확인하였다. Cluster-based routing is high energy consumption of cluster head nodes. A recent approach to resolving the problem is the dynamic cluster technique that periodically re-selects cluster head nodes to distribute energy consumption of the sensor nodes. However, the dynamic clustering technique has a problem that repetitive construction of clustering consumes the more energies. This paper proposes a solution to the problems described above from the energy efficiency perspective. The round-robin cluster header(RRCH) technique, which fixes the initially structured cluster and sequentially selects cluster head nodes, is suggested for solving the energy consumption problem regarding repetitive cluster construction. A simulation result were compared with the performances of two of the most widely used conventional techniques, the LEACH(Low Energy Adaptive Clustering Hierarchy) and HEED(Hybrid, Energy Efficient, Distributed Clustering) algorithms, based on energy consumption, remaining energy for each node and uniform distribution. The evaluation confirmed that in terms of energy consumption, the technique proposed in this paper was 26.5% and 20% more efficient than LEACH and HEED, respectively.
민홍기(Min, Hong-ki) 중국근현대사학회 2015 중국근현대사연구 Vol.67 No.-
This article has dealt with the discourses on Darwin’s theory of evolution which existed in Late Qing China, especially the discourses on the origin of man. The people who introduced the knowledge of the theory of evolution for the first time in China, in Late Qing China, were the missionaries of Christianity. From the early 1870’s until the mid 1890’s, these people had managed the supply of the Western natural science knowledge. They decided through what methods the knowledge of the theory of evaluation will be supplied. They sorted out the knowledge to be supplied and the knowledge to be excluded. And through this series of the process that attenuate the elements that will threaten the Christian values, the discourse power was exercised. In such a situation, the discourses on the theory of evolution in China were extremely slight. Such a situation rapidly changed from the end of the 1890’s. The Tianyanlun by Yan Pu, which appeared at the time when the crisis consciousness of the Chinese society had arrived at the critical point, caused the massive sensations. The publication of the Tianyanlun became an opportunity. And the discourses on the theory of evaluation had greatly increased suddenly. The topics that had swept the discourses on the theory of evaluation at this time were the slogans of the Social Darwinism. These became deeply engraved in the heads of the Chinese intellectuals by being interlocked with the situation of the era of China. The discourse on the origin of man, too, became invigorated by receiving the stimulations by the publication of the Tianyanlun. The discourses on the theory of evolution in the intellectual society of China ever since the publication of the Tianyanlun had mostly been unfolded in the direction of weakening their traditional doctrines when seen from the position of Christianity. Because of this reason, the Chinese Christianity had intended to defend their doctrines. At this time, their strategy had been to drive the subject of the evolution and the origin of man to the contest between ‘true’ and ‘false’. And the comments on the ‘true’ and the ‘false’ of the Chinese Christianity that had appeared in this process showed where the place that they had been actually looking at was. Although it was thought that the Chinese Christianity had criticized Darwin’s theory, in fact, the actual protagonists appearing in their discourses were Spencer and the theory of social evolution and not Darwin. This tells us that the spot on the name tag of the Chinese Christianity on which the side dot will be branded was not Christianity but was China. In other words, in the environmental conditions of the China in the early 20th century, the Chinese Christianity had no choice but to look at only the domain that had been restricted with the distorted view from the beginning. Such facts tell us what are the principles behind the operations of the discourses. The granting of the status of the ‘true’ to the diverse opinions that appear within the discourses until before the caving over of the layer of the recognition comprises, eventually, the external conditions that regulate the structures of the discourses themselves.
한국산 고등군류의 성분 연구 (18) : Russula pseudodelica와 Microporus affinis의 성분
민홍기(Hong-Ki Min),김병각(Byong-Kak Kim) 한국생약학회 1980 생약학회지 Vol.11 No.1
To investigate constituents of Russula pseudodelica Lange and Microporus affinis (Blume et Nees) Kuntze, quantitative aralyses of free and total amino acids were carried out with GLC and an amino acid autoaralyzer. Polysaccharides of the two mushrooms were extracted with hot water and the filtrate was concentrated. The additior of three volumes of ethanol to the concentrate formed precipitation of crude polysaccharides which were analyzed by HPLC.