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서명환(Myung-Hwan Seo),윤현주(Hyeon-Ju Yoon),마중수(Joong-Soo Ma) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.1C
배터리를 주 전력원으로 사용하는 MANET(Mobile Ad hoc NETwork)에서 전력 소비를 줄이는 방법에 대한 연구가 활발히 진행되고 있지만, 이의 실험을 지원하는 시뮬레이션 도구를 찾아보기는 어렵다. 본 논문에서는 IEEE 802.11의 DCF-PSM 시뮬레이션 환경을 제공하기 위해 ns-2에 PSM 모듈을 구현하였고, 특히 전력 소비와 관련된 결과 자료를 쉽게 생성하기 위해 여러 가지 편의성을 제공하는 에너지 모델을 제안하였다. 이러한 모듈의 개발로 PSM 환경에서의 상위 계층 프로토콜의 성능 평가나 PSM에 적합한 새로운 상위 계층 프로토콜의 개발이 가능해졌고, PSM을 개선하는 알고리즘의 구현과 그의 성능 평가도 훨씬 쉽게 이루어질 수 있게 되었다.
CW 바이오 레이더에서 수정 송수신 모델을 이용한 심장 박동 및 호흡 검출
서명환(Myung-Hwan Seo),이병섭(Byung-Seub Lee) 한국전자파학회 2008 한국전자파학회논문지 Vol.19 No.11
이 논문에서는 여러 곳에서 통용되고 있는 기존의 CW(Continuous-Wave) 바이오 레이더 송수신 모델을 수정한 새로운 송수신 모델을 제안한다. 최근에 심장 박동과 호흡을 검출하기 위해 CW 바이오 레이더를 이용해서 여러 연구 기관에서 연구가 진행되고 있다. 그러나 이 통용되고 있는 수신 모델을 이용해서 심장 박동을 검출하게 되면 여분의 위상 변이나 가우시안 잡음에 취약하고, 또한 인체 공학적으로 개념상 정확하지 못한 단점을 가지고 있다. 그러므로 이 논문에서 인체 공학상으로 정확한 수정된 CW 바이오 레이더 송수신 모델을 제안함으로써 여분의 위상 변이와 가우시안 잡음이 있는 환경뿐 아니라 다중 경로 환경에서 기존의 송수신 모델과의 심장 박동과 호흡 검출에 대한 성능을 비교 분석한다. The paper proposes a new signal model which is revised from the commonly used signal model. Recently, many research institutions had a research about CW bio-radar for detecting the heartbeat and respiration. However, when the bio-radar detects the heartbeat using the previous signal model, the bio-radar has a disadvantage of weakness about the residual phase and AWGN. Also, the model is inappropriate in ergonomics because this signal model supposes that the heart and lung are located at a same place. In this paper, the modified signal model, which is appropriate in ergonomics, is proposed. This paper analyzes and compares with the performance for detecting the heartbeat and respiration using the previous model and revised model in AWGN and multi-path environment.
서명환 ( Myung Hwan Seo ),조만복 ( Man Bok Cho ) 한국노인의료복지학회 2012 노인의료복지연구 Vol.4 No.2
In this study, we sought to find out the effects of participation in Rehabilitation program on successful aging. The target wasthe elderly of 60 year-old or older living in the Daegu and Gyoungbook regions. A pilot survey was performed on 120 elderly people who were participating in Rehabilitation program to examine the validity of the survey content, after which the questions were restructured and then finally modified and supplemented. The data collection was performed after the researcher and ten research assistants who were trained beforehand met personally with the elderly and explained to them the purpose of the study. When the elderly could answer the questions on their own, they wrote down the answers themselves, but many of the elderly had poor eyesight for reading and some were illiterate, so in these cases the researcher and the research assistants dictated the questions to them and recorded their answers. In this way 810 elderly people were questioned, of which 43 had incomplete or untrustworthy responses, and the remaining 767 questionaries were used as the data for final analysis, and the summary is as below. It was found that the satisfaction level with the Rehabilitation program has direct effect on the life change and the elderly``s successful aging. The higher the elderly``s satisfaction level with their Rehabilitation program was, the more strongly they displayed positive life changes and successful aging. After participating in Rehabilitation program, the life changes had direct effect on successful aging so that the positive changes in one``s life affected his successful aging. As for the variables that affect the life change and successful aging after participation in Rehabilitation program, the satisfaction level with the program had valid effect as both direct and indirect effects, while the life change had positive effect on the elderly``s successful aging only as a direct effect. As the main purpose of this study, it was found that the elderly participating in Rehabilitation program had high number for successful aging. As the study result shows, the elderly``s participation in Rehabilitation program has positive effects on his successful aging and is meaningful for forming self-efficacy more positively.
성인학습자의 학습유형과 학습만족도가 삶의 질에 미치는 영향
서명환 ( Seo Myung-hwan ),김진숙 ( Kim Jin-sook ) 한국노인의료복지학회 2016 노인의료복지연구 Vol.8 No.2
This study is to identify the impact of learning styles and satisfaction of adult learners on quality of life. To this end, subjects for study were 307 adult learners in Gyeongbuk, Daegu over 30s or under 64 years for analysis. The results are as follows. First, the types of learning depending on general characteristics of the subjects, learning satisfaction, and the difference of quality of life appeared significant difference in terms of gender, marital status, and educational background. However, there was not much significant difference in terms of age, religion, occupation, residence, and monthly income. Second, the learning types and satisfaction of adult learners show significant positive correlation with quality of life. Third, from the results of analyzing impact of the learning types and learning satisfaction of adult learners on quality of life, a sub-variable of learning types showed most influential. Reviewing sub-factors of quality of life specifically, school life satisfaction of learners appeared affecting family life considerably. Self-regulation of learning styles appeared that it affects social leisure activities, physical activities, and careers and employment.
서명환(Myung-hwan Seo),강준환(Jun-hwan Kang),김선형(Sun-hyung Kim) 한국정보기술학회 2008 한국정보기술학회논문지 Vol.6 No.5
In this paper, a MODEM for RFID system which operated in 900MHz UHF band is designed. Composition of modem is consisted of baseband part and RF part, and embodied to FPGA and micro strip antenna each. It is posible to adapt to RFID and zigbee system by use of the Modem which designed in this paper, The implemented baseband part of RFID reader system is constructed as VHDL using ISE9.1i, design tool of Xilinx and I made an experiment on it tagetting Spartan2, FPGA device of Xilinx. Construction verification is measured each block through Logic Analyzer. In the RF part, produced microstrip patch style antenna and measured by Network Analyzer.
인문학교육이 자활사업 참여자의 임파워먼트에 미치는 영향
김말란 ( Mal Lan Kim ),서명환 ( Myung Hwan Seo ) 한국노인의료복지학회 2014 노인의료복지연구 Vol.6 No.2
The results are as follows : The results of the population sociological characteristics (gender, age, academic background, marital status, family types, health status, and so on) were not statistically significant. Therefore, it showed the population sociological composition of the experimental and control group was mostly good. In the case of empowerment, relative empowerment related to performance and personal empowerment signifying task-oriented level strongly improved. Meanwhile, the participants in self-sufficiency support program who took tile course of tile humanities showed especially the improvement in relative empowerment and personal empowerment.