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장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.
金宗植,李泳世 계명대학교 산업기술연구소 1991 産業技術硏究所 論文報告集 Vol.14 No.2
The calcium hydroxide/calcium oxide reversible thermochemical reaction cycle has the greatest practicability as one of the most promising chemical heat storage material . It is necessary to select the optimal type of heat recovery device using the reversible thermochemical reaction cycle of Ca(OH)₂/CaO and to improve the production process of Ca(OH)₂. The experimental apparatus is a packed bed shape which is suitable to optimal type of heat recovery device. The reaction characteristics of heat release process for the hydration of CaO can be used to improve the production process of Ca(OH)₂.
김도관,박종세,김용식 大韓神經精神醫學會 1988 신경정신의학 Vol.27 No.1
This study was conducted to investigate the acute effects of caffeine in chronic schizophrenia. Eighteen DSM-Ⅲ diagnosed chronic schizophrenic patients and sixteen healthy subjects were orally administered caffeine, 10㎎/㎏, in a double blind placebo controlled design after being free of caffeine for a minimum of 2 weeks. The effects of caffeine were assessed by employing Brief Psychiatric Rating Scale, Hamiltion Anxiety Scale, and measures of blood pressure, pulse and plasma caffeine level, prior to the challenge and 60 minutes afterwards. The results were as follows : 1) Activation factor(tension, excitement, mannerism and posturing) of BPRS was worsened significantly by caffeine challenge in the schizophrenic patients. 2) Caffeine produced significant increase in somatic anxiet factor score of HAMA in the healthy subjects. 3) There was no significant difference in blood pressure and pulse rate between caffeine and placebo-group except sitting diastolic BP in the healthy subjects, which was higher in experimental group. There findings suggest that caffeine tend to exacerbate symptoms of psychosis but do not increase anxiety in the schizophrenic patients compared with the healthy subjects demonstrated decreased sensitivity to the anxiogenic effects of caffeine.
이종성,김세찬 부천대학 2001 論文集 Vol.22 No.-
본 논문에서는 다변수 제어시스템 설계시 효과적인 제어를 어렵게 만드는 요인중의 하나인 입력과 출력의 결합문제를 해결하기위해서 각 채널의 출력변수는 대응되는 입력 신호에 의해서만 독립적으로 조정되도록하는 비결합제어기를 설계하였다. 설계된 제어기는 비결합 조건뿐만아니라 제어계의 성능을 동시에 고려한 수 있는 2자유도 구조를 가지고 있다. 또한 제어기의 계산을 용이하게 하기위해서 플랜트를 표준모델로 확장시킨 후 전달 행렬을 이용하여 상태공간계수로 표현하였다. 이 경우 비결합제어기의 자유매개변수를 구하는데 있어서 지능형탐색방법의 일종인 유전알고리즘을 적용하였다. 일반적으로 유전알고리즘을 특정한 문제에 적용할 경우 그 문제가 가지고 있는 최적화 특징을 잘 파악하여 이 것을 이용하는 것이 유전알고리즘 적용의 성공여부를 결정하는 중요한 요인이된다. 따라서 본 연구에서는 유전알고리즘을 이용하여 고정차수의 정방 비결합제어기의 H₂설계시 효율적인 방법을 제시하였다. In this paper, the genetic algorithm is used to design a fixed order square decoupling controllers based on the Two-Degree-of-Freedom standard model. The proposed controller considers both the performance of controller and decoupling properties. A minimal set of assumptions for existence of the decoupling controller formula is describde in the state-space formulas. It is verified by an example.