BMS 수리모형하에서 시스템의 수리효과 및 고장강도함수의 모수추정

윤원영,정석주,정일한,김종운,정상욱 한국경영과학회 2000 韓國經營科學會誌 Vol.25 No.4

Estimation problems of parameters of the failure process and the repair effect in repairable systems are considered. We propose estimation procedures in repairable systems without preventive maintenances. The fallure process is modeled by a proportional age reduction model (Brown. Mahoney, Sivazlian [5]) which is able to consider both aging and repair effects. Maximum likelihood method is used to estimate the repair effect and parameters of intensity function simultaneously. Simulations are performed to evaluate the accuracy of estimators. A numerical example is also presented.

Implementation of UPT Service in WIN-Based Mobile Communication Networks

Yun Won Chung(정윤원),Min Young Chung(정민영),Dan Keun Sung(성단근),In Jeong Kim(김인정),Jung Keun Shin(신정근),Sung Kim(김성) 한국통신학회 1999 한국통신학회 학술대회 및 강연회 Vol.1999 No.4

2.45GHz ISM 대역의 송신 전력 제어를 위한 전력 검출 기법 비교 연구

정명래,이상원,김학선,이윤현,이형재 대전산업대학교 반도체기술연구소 1999 半導體技術硏究所報 Vol.1 No.-

본 논문에서는 2.45GHz ISM 대역의 전력 제어시 추정 오차를 줄이기 위하여 콘덴서를 이용한 직접 결함 전력 검출기와 방향성 결합기에 의한 전력 검출기를 설계하여 전압 감도, 대역폭, 기판 크기 등의 특성을 비교. 분석하였다. 측정한 결과, 전압 감도는 입력 전력이 -50dBm 에서 -25dBm까지는 전압 감도가 거의 비슷하지만 -25dBm에서 -10dBm까지는 방향성 결합기에 의한 전력 검출기의 전압 감도가 최대 3.5㎶/㎼ 정도 우수하며, 대역폭은 방향성 결합기에 의한 전력 검출기가 콘덴서를 이용한 직접 결합 전력 검출기보다 63MHz 더 넓었다. 그러므로 전력 제어를 위한 검출기 선정시에 송신기의 출력 레벨이 -20dBm 이하인 경우는 특성이 비슷하므로 기판 크기를 줄이기 위해서는 콘덴서를 이용한 전력 검출기를 선정하는 것이 좋고, -20dBm 이상 또는 광대역의 경우는 전압 감도를 고려하여 방향성 결합기에 의한 전력 검출기를 선정하는 것이 추정 오차를 줄일 수 있다. In this paper, we designed the power detector with the capacitor to decrease the estimation error and directional coupler which are used in 2.45GHz ISM band, also compared and analyzed the characteristics of the power sensitivity to estimate the performance of detector, the bandwidth and the printed circuit board size. As the results, their voltage sensitivity is constant from -50dBm to -25dBm which is the input power, but the detector composed by the directional coupler is superior about 3㎶/㎼ than that by the single diode from -25dBm to -10dBm and its bandwidth is wider about 63MHz than the directional coupling power detector with the capacitor. Therefore when the output level of transmiter is below -20dBm, the power detector with the capacitor had better be selected as the detector for the power control to reduce the area because of the similar characteristics, and above -20dBm or in the wide band system, the estimation error can be eliminated by the selection of directional coupler considered the voltage sensitivity for the power detector.

고등학교 지구과학 실험·실습 요목 비교 분석

정원우,이윤종,기우항,김영호,양승영,강용희,안병호,임성규,윤일희,김중욱,윤성효,강동진 경북대학교 과학교육연구소 1997 科學敎育硏究誌 Vol.21 No.-

The purpose of this study is to investigate the status of the experimental and practical education in high school earth. The present status and reasonable management of the experimental and practical education in high school earth science have been grasped from the questionaires. To do this, eighty eight earth science teachers in Korea are administered questionaires. The frequency of the experimental and practical items in the seven kind of earth science text books were investigated. The problems and the reasonable management for experimental and practical education were proposed in this paper.

의과대학생의 자연최면경험과 최면유도점수의 상관관계

이정태,최윤정,전양환,성양숙,박원명,김광수,유태열 大韓神經精神醫學會 1997 신경정신의학 Vol.36 No.5

목 적 : 저자들은 자연최면경험과 최면감수성간의 관계를 알아보기 위하여 자연최면점수와 최면유도 척도로 얻은 최면유도점수 및 유도점수와의 관계를 알아보고, MBTI(Myers-Briggs Type Inventory)의 성격유형과 이들의 상호관련성을 알아보려고 하였다. 방 법 : 가톨릭대학교 의과대학에 재학중인 63명의 의대생들을 대상으로 하여 자연최면경험에 대한 설문지와 MBTI를 작성하게 하고 최면유도척도로 최면을 유도하면서 최면유도점수와 유도점수를 얻었다. 결 과 : 1) 자연최면점수와 유도점수 사이에서 양의 상관관계가 있었고, 최면유도점수와 유도점수 사이에도 양의 상관관계가 있었다. 2) 자연최면점수와 최면유도점수 사이에서는 통계적으로 유의한 상관관계가 없었다. 3) MBTI의 각 성격유형들은 최면유도점수와 유도점수 사이에서 양의 상관관계가 있는 것으로 나타났다. 4) 외향형과 사고형의 성격유형은 자연최면점수와 최면유도점수에서 각각 양의 상관관계가 있었고, 자연최면점수와 유도점수 사이에서도 양의 상관관계가 있었다. 5) 직관형과 판단형은 자연최면점수와 유도점수 사이에서 각각 양의 상관관계를 보였다. 결 론 : 자연최면점수는 유도점수와 상관관계가 있었다. MBTI의 외향형과 사고형에서는 자연최면경험이 많을수록 최면유도가 잘 된다는 것을 시사하였다. Objective : We attempted to investigate the relation between naturally occurring hypnotic experiences and hypnotizability. We examined the correlations among hypnotic induction profile scores, natural hypnotic scores, induction scores and MBTI personality types. Methods : Sixty-three medical students completed NHQ(natural hypnotic questionnaire) developed from a list of naturally occuring hypnotic-like experiences and MBTI(Myers-Briggs Type Inventory). HIP(Hypnotic Induction Profile) was also administered to all the subjects. HIP score and IND(induction score) were obtained. Results : 1) The NHS(natural hypnotic score) was significantly correlated with IND in all the subjects. The IND also showed significant correlation with HIP score. 2) There was no significant correlation between NHS and HIP scores. 3) HIP scores were positively correlated with induction scores in all types of MBTI. 4) Natural hypnotic scores were positively correlated with HIP scores and induction scores in introvert and thinking types. 5) There were positive correlations between natural hypnotic scores and induction scores in intuition and judgment types. Conclusion : The natural hypnotic scores were correlated with induction scores. It is suggested that the more the naturally-occurring hypnotic experience is experienced, the better the hypnotic induction is induced in introvert and thinking types of MBTI personality types.

고속가공을 위한 검사시편에 관한 연구

정종윤,황영수,이춘만,정원지,고태조 한국공작기계학회 2003 한국생산제조학회지 Vol.12 No.4

The properties of a machine tool greatly affect machining quality since a machine tool has large variance in its features. Machine tool makers want to find best machining condition with the one that they have built. Machine builders need to develop test specimen since it helps finding characteristics of machine tools when the machining properties of the specimen are analyzed. This paper develops test specimen to identify features of the main spindle, the feeding device, and the frame of a machine tool. The specimen is machined with a high speed machine and the features of the machine are analyzed with test items. They are surface roughness, overshoot in axial movement, errors in circular movement, feeding with small movement, and compensational error. This work can improve usability for a machine tool in machining practice.

관동맥 우회로 이식술후 우회 혈관의 개존 여부 평가에 있어 전자선 단층 촬영을 이용한 3차원 혈관조영술의 유용성

하종원,조승연,심원흠,정남식,이향미,최규옥,장양수,유경종,강면식 대한순환기학회 1998 Korean Circulation Journal Vol.28 No.5

새로운 Ca^2+ 길항제의 혈압강하효과

함원훈,임태균,정윤성,정윤호,양재권,최원철 성균관대학교 약학연구소 1993 成均藥硏論文集 Vol.5 No.1

Diltiazem and nifedipine, have been used throughout the world as an effective antianginal and antihypertensive agent. In order to increase the activity of these drugs, we synthesized the diltiazem-nifedipine coupling compounds. These compounds^(1-8) were tested for antihypertensive effect. Unfortunately, these compounds didn't show any promising activities.

산업장 근로자의 스트레스에 대한 한의계 연구경향

차윤엽 ( Yun Yeop Cha ),고연석 ( Youn Seok Ko ),이정한 ( Jung Han Lee ),정원석 ( Won Suk Chung ),신병철 ( Byung Cheul Shin ),전찬용 ( Chan Yong Jeon ),고호연 ( Ho Yeon Go ),선승호 ( Seong Ho Sun ),장보형 ( Bo Hyoung Jang ),송윤경 한방재활의학과학회 2013 한방재활의학과학회지 Vol.23 No.2

Objectives : The purpose of this study is to explore the trends of Korean medical study on stress in the industrial worker. Methods : We received numbers of the studies about stress in the industrial worker from 6 Korean web databases, using key words such as ‘Industry AND Stress’, ‘Oriental medicine AND Stress’, ‘Worker AND Stress’, ‘Workplace AND Stress’. We received 12 research papers and they were analyzed and the journals, the authors, the contents of 3 classification of those research papers. Results : Among them, we had 6 reviews of Dept. of preventive medicine and Dept. of third medicine, college of Korean Medicine, Won-kwang University, and the rest of them were 6 reviews. We had 4 reviews of Korean Journal of Oriental Preventive Medical Society, 2 reviews of the Journal of Traditional Korean Medicine, 2 reviews of Journal of Oriental Neuropsychiatry and so on. According to the contents of reviews, we had 7 reviews of correlation of industrial worker and stress, 4 reviews of cause on the industrial worker’s stress and 1 case report. Conclusions : We reviewed the trends of Korean medical study on stress in the industrial worker. The stress in the industrial workers were related with the type of occupation, social psychology, drinking, smoking, the satisfaction of job, the harmony of organization.And we knew that the musculoskeletal pain was related to the industrial worker’s stress. In the future, abundant case studies, follow-up trials and RCTs should be done about the industrial worker’s stress.

공침범으로 제조한 마그네시아 부분안정화 지르코니아 소결체의 특성에 미치는 열처리 효과

이재원,오응주,정윤중,이형복 明知大學校 産業技術硏究所 1989 産業技術硏究所論文集 Vol.8 No.-

The powder of ZrO₂-MgO systems prepared by co-precipitation method using ZrOCl₂· 8H₂O and MgCl₂· 6H₂O as the sintering materials. They are sintered and than heat treated to know that effects of agoing time and temperature on mechanical and electrical properties. The powder ZrO₂-MgO systems have∼30nm crystal size and tetragonal phase. The mechanical properties of these partially stabilized ZrO₂- MgO specimens are shown the best value when they are aged at 1,100℃ for 1 hr and at 1,450℃ for 10 hrs, but these are better than those, and while the specimens of 9.5 mole% in these thermal conditions. Electrical conductivities are measured as a function of temperature in the range of 500℃ to 1,000℃. The temperature dependence of electrical doncutivities is shown the activation energies by the heat reat conditions; no heat treating, heat treating at 1,100℃ for 1 hr, and heat treating at 1,450℃ for 10 hrs, and their values are 21.5㎉/㏖, 34.3㎉/㏖, and 43.5㎉/㏖, respectively.