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이동 노드의 이동 패턴을 고려한 Delay Tolerant Network 라우팅 알고리즘
소상호(Sang Ho So),박만규(Man Kyu Park),박세철(Se Chul Park),이재용(Jae Yong Lee),김병철(Byung Chul Kim),김대영(Dae Young Kim),신민수(Min Su Shin),장대익(Dae Ig Chang),이호진(Ho Jin Lee) 대한전자공학회 2009 電子工學會論文誌-TC (Telecommunications) Vol.46 No.4
DTN(Delay/Disruption Tolerant Network)에서 라우팅 프로토콜은 전송 지연 및 성공적인 전달 확률의 성능을 개선하기 위해 중요하다. 이 논문에서 우리는 이동성 유형 기반의 라우팅(MPR ; Mobility Pattern based Routing)이라는 효과적인 DTN 라우팅 알고리즘을 제안하는데 이는 이동 노드의 이동성 유형에 근거해 복사되는 메시지의 수를 제어하게 된다. 또한, 우리는 인간 이동성 유형을 가장 잘 나타낼 수 있는 확산성이 매우 큰(super-diffusive) 성질을 가지는 실제적인 “Levy Walk" 이동성 유형을 고려하였다. 우리는 제안된 MPR 알고리즘과 Levy Walk 이동성 유형의 검증을 위해 ONE simulator를 이용한 DTN simulator를 구현하였다. 시뮬레이션 결과 이동성 유형이 DTN 라우팅 성능의 정확한 분석을 위해 매우 중요하다는 것과 제안한 MPR이 실제 이동성 유형 하에서 성공적인 전달 확률이나 전송 지연 측면에서 라우팅 성능을 향상시킴을 보였다. Routing protocols in Delay/Disruption Tolerant Networks (DTN) are important to enhance the performance of transmission delay and delivery success ratio. In this paper, we propose an efficient DTN routing algorithm, called "Mobility Pattern based Routing (MPR)", that controls the total number of transferred message copies based on mobility patterns of mobile nodes. We consider a realistic "Levy walk" mobility pattern that has a super-diffusive property which well represents human mobility pattern. We implemented a DTN simulator using ONE simulator<SUP>[9]</SUP> for the proposed MPR algorithm and Levy walk mobility pattern. Simulation results show that mobility patterns are very important for accurate evaluation of DTN routing performance, and the proposed MPR enhances the routing performance of delivery delay and success delivery ratio under realistic mobility pattern.
BCG 결핵균 검침을 위한 열전 바이오센서의 설계 및 제작
윤승일(Seung-Il Yoon),임미화(Mi-Hwa Lim),박세철(Se-Chul Park),신전수(Jeon-Soo Shin),김용준(Yong-Jun Kim) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.5
This paper proposes a new detection method for BCG based on a thermoelectric biosensor with a split-flow microchannel. The fabricated thermoelectric biosensor was characterized through measuring a reaction heat of streptavidin and biotin pairs. And then, BCG was detected by using the sensor. In order to verify the reliability of the measurement, exactly the same amount ofBCG and its optical density were measured by ELISA.
朴世鐵 광주보건대학 1987 論文集 Vol.12 No.-
This study is to examine not only the presence of the encoding function of note-taking but also its interaction effect with note-having, the empirical validity of the three theries on the function; attention theory effort theory, generative theory. 48 female students were sampled from C department, H Junior College, Kwangju city. According to their memory ability, they were assigned randomly into 2(note having)×2(note taking) treatment conditions: note having-note taking, note having-non note taking, non note having-note taking, non note having-non note taking(listening only). After listining to the lecture on the approaches and methods of research in child development following to each instruction, they were tested by immediate test and transfer test. After a week, a delayed retention test was administered to them. Data were analyzed by 2-way randomized block-Anova method and One-way Anova method. Major findings were as follows. 1. Note taking subjects were not superior to non-note taking subjects in the retention scores significantly. 2. There was no significant interaction effect between note taking conditions and note having conditions on the retention measures. 3. Note taking groups' transfer scores were higher than them of non-note taking subjects significantly. 4. Note taking conditions were not interact with note having conditions on the transfer measure significantly. In conclusion, note taking have not a facilitative effect on overall encoding of the learners in the classroom, but it can facilitate assimilatory encoding except additive encoding. This facts seems support generative theory on the encoding function of note taking. Note having tends to result in better learners' meaningful learning (ie, transfer) when it is matched with note taking than not.
분산 객체 기반 실시간 오디오/비디오 스트림 서비스의 설계 및 구현
김종현,박세철 동의공업대학 1999 論文集 Vol.25 No.1
This paper present a design and implementation of a realtime audio/video stream service based on distributed objects. Our design abstracts software components concerning the processing of audio/video as distributed objects. And we separates the transmission path of control data and media data for efficient stream transfer. Our total system architecture composed of three component systems, called Storgae Server, Control Server and Client. So we can extend systems easily in distributed environments. As proof concept, we implement a prototype system using distributed objects which support realtime audio/video stream services.