운동이 백서 스테로이드 근병증에 미치는 효과

박상준,이민철,김세종,박상준,이민철,김세종 대한신경과학회 1999 대한신경과학회지 Vol.17 No.5

DSP를 利用한 Phase-shifted PWM 直列共振型 DC-DC 컨버터

김현준,김학성,김세찬,유동욱,원충연 成均館大學校 科學技術硏究所 1995 論文集 Vol.46 No.2

This paper deals with a phase-shifted PWM high-frequency series resonant DC-DC converter using IGBTs. The converter output voltage regulation is digitally controlled using DSP(TMS320C31) for a fast rising time and low ripple output voltage. A PID controller and feed-forward controller is adopted as a controller and implemented on software. Simulation technique are employed to describe resonant converter behavior, which can present system output exactly and calculate in short time, by applying numerical method to the state equation of each equivalent circuit. And the simulation results are verified as compared with experimental results.

전자상거래를 위한 지불결제 시스템 구현

김흥준,손세일,김창근 진주산업대학교 산업과학기술연구소 2004 산업과학기술연구소보 Vol.- No.11

New and safe ways of payment such as electronic wallet, electronic money and electronic check have been developed and implementation of a secure credit card-based payment system. The system ensures that the payment information must be new and it can operate with the old credit card system.

한국인 직무 스트레스 측정도구의 개발 및 표준화

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.

유연성 : 새로운 경쟁무기 New Move To Competition?

김기영,박준병,오세진 한국경영과학회 1990 經營 科學 Vol.7 No.2

Flexibility, in the context of manufacturing, refers to an ability to accommodate changes in market requirements in terms of product, process, and other services in a timely manner at a reasonable cost. The basic purpose of this paper is to analyze manufacturing strategies of leading Korean manufacturers in order to answer the following questions : How important are manufacturing flexibilities to Korean companies in restoring their once competitive cost-based strategies and adopting new variety-based strategies? How effectively are Korean companies competing with their foreign competitors, like the US and European companies in terms of manufacturing flexibilities? And in order to improve the flexibilities what kinds of manufacturing capabilities are considered as important key factors by Korean manufacturers and are their action programs effectively implemented to acquire these capabilities? Major findings of the analysis indicate that Korean companies are very eager to reorganize their high-volume, cost-based corporate strategies as low volume, variety-based strategies. However, Korean manufacturers are still much dependent on the large size high volume factories and/or 'focus factories'. And the action programs and technologies to improve manufacturing flexibilities have been actively implemented at a higher rate than those of their foreign counterparts.

로보트 매니퓰레이터에 대한 강건한 적응제어기 설계

安秀寬,朴世勝,裵悛坰,朴鍾國 慶熙大學校 1989 論文集 Vol.18 No.-

In this paper a new adaptive control algorithm is derived, with the unknown manipulator and payload parameters being estimated online. In pratice, we may simplify the algorithm by not explicitly all unknown parameters. Futher, the controller must be robust to residual time - varying disturbance, such as stiction or torque ripple. Also, the reference model is a simple double integrator and the acceleration input for robot manipulator consists of a proportion and derivative controller for trajectory tracking purposes. The validity of this control is confirmed in simulation where two - link robot manipulator shows the robust performances in spite of the existing nonlinear interaction and unknown parameter changes.

전력전자 PSPICE 컴퓨터 시뮬레이션을 위한 스위치 모델

元忠淵,金淵俊,金世燦,金德憲 成均館大學校 科學技術硏究所 1990 論文集 Vol.41 No.2

PSPICE is widely used in analysis of general circuit and simulation in electric and electrical field is applied to power electronics circuit. The circuits used with thyristors will add significant complexity to PSPICE analysis, it is important that the thyristor model be as simple as possible. In order to solve this problem, an ideal voltage controlled switch and an ideal current controlled switch were added as circuit elements. Two typical power electronics circuits simulation using PSPICE program presented.

흰쥐에서 니켈 및 카드뮴의 동시노출이 간에 미치는 영향

차봉석,왕승준,장세진 大韓産業醫學會 2000 대한직업환경의학회지 Vol.12 No.1

목적 : 이 연구는 적출간 관류법을 이용하여 영화니켈과 염화카드뮴의 동시 노출로 인하여 간에 나타나는 효과를 확인하는 데에 있다. 방법 : 간독성의 지표로서 AST, ALT, LDH의 농도 및 관류속도를 이용하였고 생존력에 대한 지표로서 산소소모율을 측정하였다. 300(±50) g의 흰쥐를 노출군(비노출군 및 50 μM/ 200 μM의 각 농도별 염화니켈과 염화카드뮴의 개별 투여군 및 동시 투여군)별로 5마리씩 총 35마리를 할당하였다. 간을 통과한 관류액을 채취하여 생화학적 간독성 지표를 측정했고 집단간의 시간의 경과에 따른 측정치의 비교를 위해 반복 측정된 2요인 분산분석을 실시하였다. 개별 투여군과 동시 투여군의 생화학적 지표간의 평균을 비교함으로써 상승효과에 대한 가능성을 확인했다. 결과 : 개별 투여군 및 동시 투여군 모두에서 AST, ALT, LDH가 증가했다. 관류속도 및 산소 소모율은 시간의 경과에 따라 감소했으나 통계적으로 유의한 차이를 보이지는 못했다. AST, ALT, LDH, 산소소모율이 일정 시간대 이후로 개별 노출군의 합보다 동시 노출군에서의 측정치가 더욱 크게 증가하였다. 결론 : 간독성에 대한 생화학적 지표의 변화를 확인함으로써 두 물질의 동시노출로 인한 복합적 효과는 상승효과일 가능성이 높은 것으로 보인다. Objectives : This research was intended to verify hepatic effect of simutaneously com-bined exposure of nickel chloride and cadmium chloride with IPRL (Isolated Perfumed Rat Liver) method. Methods : AST(aspartate aminotransferase), ALT(alanine aminotransferase), LDH (lac-tate dehydrogenase) and perfusion flow rate were used as the indicator of hepatotoxicity and oxygen consumption rate were used as the indicator of viability. 300(±50) g - weighted rats were allocated randomly to each group (control group, 50 μM·200 μM sera-rately exposure group of NiCl₂and CdCl₂, simultaneously combined exposure group of NiCl₂and CdCl₂by 5, totally 35. Buffer which got out of liver was sampled and then biochemical indicator of hepatotoxlcity was measured. In order to verify difference among groups, two way - repeated ANOVA was used. With comparing mean summation of sepa-rate exposure group with mean of simultaneous exposure group, possibility that combined effect could be synergistic effect was verified. Results : AST, ALT, LDH increased in both of separate exposure group and simultaneous exposure group. Perfusion flow rate and oxygen consumption rate decreased but statlstically significant difference among groups was not found. In each exposure group, AST, ALT, 7DH, oxygen consumption rate of simultaneous exposure group increased more than sum of separate exposure group after any sampling time. Conclusions : It was found that simultaneous combined effect could be synergistic effect through the biochemical indicator of hepatotoxicity.

조산의 역학적 연구 : 조선대학교병원 최근 6년간의 조산아 예후분석 Prognostic Evaluation of Preterm infants in chosun University Hospital from 1992 to 1997

김영호,최상준,송창훈,한세준,정혁,박상기,박종 조선의대 1998 The Medical Journal of Chosun University Vol.23 No.1

골반경수술의 임상적 고찰

강민창,조혜진,최상준,한세준,정혁 朝鮮大學校 附設 醫學硏究所 2003 The Medical Journal of Chosun University Vol.28 No.2

Objective: Pelviscopic surgery has been used in the treatment of some gynecologic disease. And now, it is applied in almost all cases of gynecologic disease. This study is performed to evaluate the clinical advantages of pelviscopic surgery and current circumstance of ORGY of chosun university hospital. Methods: From March, 2000 to February 2003, total 437 cases were received laparoscopic surgery on department of ORGY of Chosun University hospital. We reviewed the chart and analyzed these cases according to age, parity, clinical indication, operation type, duration of hospitalization, operation time and complication. Results: The results are summarized as follows, The mean age of patients was 42.5 years old with ranges between 15 and 61 years old and mean parity of the patients was 1.95. The common indications were uterine myoma (45.1%) , ovarian tumor (15.3%) and ectopic pregnancy (7.3%) and frequent types of surgery were laparoscopic assisted vaginal hysterectomy (LAVH) (46.9%) , salpingectomy (8.5%), oophorectomy (8.5%). The operation time was variable according to types of operation and difficulty and the mean duration of hospitalization was 4.27 days. The most frequent complication was hemorrhage at the trocar site. Conclusion: Pelviscopic surgery is useful and recommended for the treatment of gynecologic disease, because this is safe and has many advantages. So, we expect the number and indication of pelviscopic surgery will be increased in future. 목적 : 진단목적으로 시행되어오던 골반경 수술이 부인과 질환의 거의 모든 영역에서 적용되어있다. 이에 골반경 수술의 임상적 이점에 대해 알아보고자 본 연구를 시행하였다. 연구방법 : 2000년 3월부터 2003년 2월가지 조선대학교 병원 산부인과에서 골반경 수술을 시행 받은 437명의 외래 및 입원기록을 검토하여 환자의 연령, 출산력, 골반경수술의 적응증, 수술종류 및 시간, 입원기간, 합병증을 분석하였다. 결과 : 2000년 3월부터 2003년 2월까지 시행한 437예의 골반경수술을 분석하여 다음과 같은 결과를 얻었다. 환자들의 평균연령분포는 15세에서 61세 사이였고 평균 연령은 42.5세이었다. 평균 출산력은 1.95회이었다. 골반경 수술은 LAVH가 205예 (46.9%) 로 가장 많았고, 난관 절제술이 37예 (8.5%), 난소 적출술이 35예 (8.%), 난소부분절제술이 28예(6.4%) 이었다. 골반경 수술의 적응증은 자궁외 임신이 43예(86%), 자궁근종이 197예(61.2%), 난소종양이 82예(52.6%) 이었다. 수술시간은 수술의 종류 및 난이도에 따라 다양하였다. LAVH의 경우 평균 38.2분, 난소난관 절제술의 경우 평균 31.9분, 난관 절제술의 경우 평균 30.7분이 소요 되었다. 평균 실혈량은 LAVH가 1.16g/dl, 난관절제술은 0.94g/dl, 난소난관 절제술의 경우는 0.97g/dl이었다. 입원기간은 대부분 1일에서 5일 사이였으며, 평균 4.27일 이었다. 가장 많은 합병증은 트로카 천공부위 출혈이었다. 결론 : 본 연구의 결과로 골반경 수술은 현재 부인과 질환의 진단과 치료에 있어서 매우 유용하며 개복 수술을 대치하는 상황으로 나아가고 있다.