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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.
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.
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.
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문종우,김종수,박세승 조선대학교 전자정보통신연구소 2002 電子情報通信硏究所論文誌 Vol.5 No.2
This paper presents the kinematic model and the design of a model-reference adaptive controller for wheeled-mobile robots(WMRs) with 2 d.o.f. We derive the forward kinematics and the inverse kinematics to calculate the wheel-velocity and body-velocity. The controlled variables are represented in the polar coordinate so that the number of the controlled variable can be reduced to the same number as the control input. A controller is proposed for path tracking, and then controller parameters are modified by adaptation law based on model-reference adaptive control(MRAC) each step. The designed adaptive controller is analyzed, and its stability and convergence are proved. Simulation is conducted to evaluate the control system and the results are shown.