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생산직 근로자의 근골격계 질환 예방을 위한 신체활동 및 관련요인
은수정,김건엽 한국보건교육건강증진학회 2019 보건교육건강증진학회지 Vol.36 No.1
Objectives: This study was conducted to examine the level of physical activity for the prevention of musculoskeletal disorders (MSDs) in blue-collar workers and to identify related factors influencing them. Methods: The subjects of this study were 180 blue-collar workers working for 12 small and mid-sized manufacturing companies in Daegu・Gyeongbuk provinces. The questionnaire consisted of demographics, work related characteristics, health belief model of the subject, knowledge and frequency of musculoskeletal disorders prevention education, and physical activities for musculoskeletal disorders prevention. Results: In the univariate analysis of blue collar workers' physical activities, barrier to health belief model, knowledge, frequency of musculoskeletal disorders prevention education were highly correlated. The result from logistic regression using physical activity as a dependent variable was barrier, and the lower the barrier, the more likely it was included in the practice group. Conclusions: In order to prevent the musculoskeletal disorders of blue-collar workers, it is necessary to develop a musculoskeletal disorders prevention program, educational development, and an environment to lower the barrier that have the greatest effect on physical activity practice.
강도변조/직접검파 광통신 수신기에서 심벌간 간섭을 고려할 경우 타이밍 지터에 의한 잔력 페널티 해석
은수정,심요안,김부균 한국통신학회 1996 韓國通信學會論文誌 Vol.21 No.4
In this paper, we propose a new method to analyze the performance degradation by timing jitters in the receivers of intensity modulation/direct detection digital optical communication systems where pulse-shaping filters are used to minimize intersymbol interference. The results obtained from the proposed analytical method show that conventional analytical methods underestimate the influence of timing jitters on the receiver performance. Using the proposed anlaytical method, we derive an analytic equation for approximated power penalty due to timing itters and obtain an exact power penalty by numerical analyses. Assuming Gaussian or uniform probability density function for timing jitters, we also show that assumption of Gaussian distribution for timing jitters yields more performance degration than that of uniform distribution.
APD를 사용하는 광통신 시스템 수신기에서 심벌간 간섭을 고려할 경우 타이밍 지터에 대한 새로운 해석
신요안,은수정,김부균 한국통신학회 1997 韓國通信學會論文誌 Vol.22 No.3
In this paper, we proposed a new mehtod to analyze the performance degradation by timing jitters in the APD (avalanche photodiode) receivers of intensity modulation/direct detection digital optical communication systems where raised cosine pulse-shaping filters are used to reduce the effect of noise while minimizing intersymbol interferences. The proposed analytical method is an extension of an analytical method we have already developed for pin diode receivers, and incorporates the effects of APD's multiplication factor and resulting shot noise. Using the proposed analytical method, we derive an approximated power penalty due to timing jitters based on an assumption of Gaussian distribution for timing jitters, and compare with that of the conventional analytical method. The results obtained from the proposed analytical method show that conventional analytical methods underestimate the influence of timing jitters on the reciver performance. The results also show that APD's multiplication factor which optimizes receiver sensitivity is smaller than that obtained by the conventional analytical method.
우리나라 퍼블릭액세스 개념 및 유형 확대를 위한 사론적 연구
박민,은수정 전북대학교 지방자치연구소 2010 지방자치연구 Vol.14 No.-
본 연구는 퍼블릭액세스의 실현을 위해서는 퍼블릭액세스 개념의 확장과 아래로부터의 실천운동에 기반한 영역의 확장이 필요하다는 점을 주장하고 있다. 이를 위해 매스미디어에 대한 개입방식을 기준으로 퍼블릭액세스의 개념을 시민저널리즘과 프로그램액세스 그리고 소유권액세스로 유형화하고 있다. 소유권액세스는 채널액세스와 소유구조 액세스로 구성된다. 특히 퍼블릭액세스의 실현은 미디어에 대한 소유와 운영에 직접 참여할 수 있는 소유권 액세스로까지 이행될 필요성이 있다는 점을 밝히고 있다 아울러 정치문화적 환경 및 역사적 맥락 속에서 서로 다르게 성장해 온 해외 퍼블릭액세스 사례를 검토함으로써 우리나라 퍼블릭액세스 지형의 확장을 모색하고 있다.