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원창수(Chang-su Won),정원섭(Won-Sup Chung),손상희(Sang-Hee Son) 대한전기학회 2008 대한전기학회 학술대회 논문집 Vol.2008 No.10
A differential capacitance deviation-to-rime converter for interfacing position sensor is presented. It consists of triaxial position sensor, six comparators, six current mirrors, and control logic. The prototype differential capacitance deviation-to-time interval converter has been simulated using Chartered 0.35-㎛ CMOS parameters. The simulation results show that the maximum conversion time of the converter is 350 ㎲ and the linearity error is less than ±0.0015%..
원창수(Chang-Su Won),박지만(Ji-Mann Park),정원섭(Won-Sup Chung),손상희(Sang-Hee Son),최창억(Chang-Auck Choi) 한국정보기술학회 2009 한국정보기술학회논문지 Vol.7 No.2
A differential capacitance deviation-to-time converter for interfacing position sensor is presented. It consists of triaxial position sensors, six comparators, six current mirrors, a control logic, a 12-bit counter, and a 16-bit latch. The proposed differential capacitance deviation-to-time interval converter has been simulated using Magna Chip 0.35-㎛ CMOS parameters. The simulation results show that the linearity error is less than ±0.0015 % and the conversion sensitivity amounting to 100.556 ㎲/pF when the capacitance deviation range of the sensor was from 0 pF to 1 pF. Maximum conversion time of the converter is about 350 ㎲ when capacitance deviation of the sensor was 1 pF.
장소환경이 걷기 운동시 생리·심리적 반응요인 및 면역요인에 미치는 영향
이충일(Chung-Il Lee),양정수(Jung-Su Yang),곽창수(Chang-Soo Kwak),이명철(Myung-Chul Lee),원강연(Kang-Yeon Won),유신환(Shin-Hwan Yoo) 한국생활환경학회 2011 한국생활환경학회지 Vol.18 No.5
The purpose of the study is to identify the effectiveness of walking program in the different environmental settings by analysing physiological psychology parameters. In an experiment with physically active males (21) who have been participating regularly in activity with moderate intensity the subjects was randomly divided into 3 groups. and Each group performed walking activity (in the urban forest and beach) for 3 days and then the changes in physiological psychology parameters were analysed (two-way ANOVA with repeated measure). The results are as follow. First the findings on the change of physiological parameters reveal significant differences in systolic blood pressure (SBP) among 3 groups (p<.05) in diastolic blood pressure (DBP) for 3 days (p<.01) and in resting heart rate (RHR) between the effectiveness of interventions (p<.05) Second the findings on the change of psychology and immune parameters reveal significant differences in cortisol among 3 groups (p<.01) in serotonin among 3 groups (p<.01) as well as for 3 days (p<.05) and in natural killer cell (NK cell) for 3 days (p<.01). For physiological recovery and relaxation and the possible additional benefits in emotions and psychology the natural outdoor components of the environment must be considered. Thus future investigation should try to study the independent and causal association with physical activity settings.