[논문]Operational Characteristics of CO2 Laser Adopted by Superposing-Discharge

Hee-Je Kim,Hyun-Ju Chung,Byoung-Dae Min,Jong-Han Joung,Sung- lun Park 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

오늘날 현저한 CO2 레이저의 응용 추세에 발맞추어 보다 다양한 형태의 출력 제어 기술이 대두되고 있다. 본연구에서는multi-Pulse Superposing-Discharge 기술을 이용하여 다양한형태의 CO2 레이저의 펄스를 성형 하였다. 펄스 성형을 위한 방법으로 PIC one-chip microprocessor를 이용하여 삼중 PFN 모률의 SCR을 각각 고유의 지연시간을 가지도록 제어하였다. 실험에 사용된 삼중 PFN 모률의 전원 회로는 각각 캐패시터 인덕터,SCR,고압 펄스 트랜스 그리고 고압 트랜스 2차측에 브릿지 정류기로 구성 하였다. 고압 펼스 트랜스의 1차측을 제어하므로서 PFN 모률의 동작을 저 전압에서 수행 할 수 있다. 트랜스의 2차측에 연결된 전파 정류기는 펄스 에너지를 부하에 지속적으로 전달한다. 본 연구에서는 삼중 PFN 모률의 각각의 SCR을 다른 시간 가격을 두고 트리거 하므로서 다양한 Long pulse shaping을 실현하였다. 또한 약 250-1000μs 의 주기를 가지는 다양한 펄스형 레이저 빔을 얻었다.

정신분열병에 대한 리스페리돈의 효과 및 안정성

이민수,김용구,김영훈,연병길,오병훈,윤도준,윤진상,이철,정희연,강병조,김광수,김동언,김명정,김상훈,김희철,나철,노승호,민경준,박기창,박두병,백기청,백인호,손봉기,손진욱,양병환,양창국,우행원,이정호,이종범,이홍식,임기영,전태연,정영조,정영철,정인과,정인원,지익성,채정호,한상익,한선호,한진희,서광윤 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.1

연구목적 : 본 시험의 목적은 임상시험 시작전에 연구자들을 대상으로 PANSS Workshop을 통하여 PANSS, ESRS에 대한 국내에서의 표준화 작업을 구축하고 새로운 정신병 치료제인 리스페리돈의 효과와 안정성을 재확인하여 리스페리돈 사용에 대한 적정화를 이루는데 있다. 연구방법 : 1996년 4월부터 1996년 9월까지 국내 39개 대학병원 정신과에 입원중인 혹은 증상이 악화되어 입원하는 정신분열병 환자 377명을 대상으로 다시설 개방 연구를 시행하였다. 1주일간의 약물 배설기간을 가진후, 리스페리돈을 8주간 투여하였고, 기준점, 1주, 2주, 4주, 그리고 8주후에 평가되었다. 용량은 제1일에는 리스페리돈 1mg씩 1일 2회, 제2일에는 2mg씩 1일 2회, 제3∼7일에는 3mg씩 1일 2회 투여하였다. 이후 환자의 임상상태에 따라 임의로 증량할 수 있으며, 최대 일일 16mg을 초과하지 않도록 하였다. 추체외로 증상을 조절하기 위한 투약을 허용하였다. 임상증상 및 부작용의 평가는 PANSS(Positive and Negative Syndrome Scale), CGI(Clinical Global Impression) 그리고 ESRS(Extrapyramidal Symptom Rating Scale)을 사용하였다. 연구결과 : 377명중 343명(91%)이 8주간의 연구를 완결하였다. 치료 종결시점인 8주후 PANSS 총점수가 20% 이상 호전된 경우를 약물 반응군으로 정의할때, 약물반응군은 81.3%였다. 리스페리돈에 반응하는 예측인자로는 발병연령, 이전의 입원 횟수, 유병기간이 관련 있었다. 리스페리돈은 1주후부터 PANSS양성, 음성, 및 일반정신병리 점수상에 유의한 호전을 보여 효과가 빨랐다. CGI의 경우도 기준점에 비해 1주후부터 유의한 감소를 나타내었다. ESRS의 경우, 파킨슨 평가점수는 기준점과 비교해 투여 1주, 2주, 4주후 유의하게 증가되었다가 8주후 기준점과 차이가 없었다. Dystonia 평가점수는 1주후만 유의한 증가를 보였으며, dyskinesia 평가점수는 유의한 차이가 없었다. 혈압, 맥박수의 생명징후 및 일반 혈액학 검사, 생화학적 검사, 심전도 검사에서 유의한 변화는 없었다. 결 론 : 이상의 다시설 개방 임상 연구를 통해 리스페리돈은 정신분열병 환자에서 양성증상뿐만 아니라 음성증상 및 전반적인 증상에도 효과적인 것으로 사료된다. 보다 명확한 평가를 위해서는 다른 항정신병약물과의 이중맹검 연구가 필요할 것으로 생각되며, 또한 장기적 치료에 대한 평가도 함께 이루어져야 하겠다. Objective : The purpose of this study was to investigate the efficacy and safety of risperidone in the treatment of Korean schizophrenic patients. Method : This multicenter open study included 377 schizophrenic patients drawn from 39 university hospitals. After a wash-out period of 1 week, the schizophrenic patients were treated with risperidone for 8 weeks and evaluated at 5 points ; at baseline, and 1, 2, 4 and 8 weeks of treatment. The dose was increased from 2mg/day(1mg twice daily) to 6mg/day(3mg twice daily) during the first week and adjusted to a maximum of 16mg/day over the next 7 weeks according to the patient's clinical response. Medication to control extrapyramidal symptoms was permitted. The psychiatric and neurological status of the patients was assessed by PANSS, CGI, and ESRS scales. Results : 343(91%) of 377 patients completed the 8-week trial period. Clinical improvement, as defined by a 20% or more reduction in total PANSS score at end point, was shown by 81.3% of patients. The predictors of response to risperidone were associated older age, shorter duration of illness, fewer previous hospitalization. Risperidone had rapid onset of action ; a significant decrease of the total PANSS and three PANSS factor(positive, negative, general), and CGI was already noticed at the end of first week. For the ESRS, parkinsonism rating scores were significantly increased until week 4 comparing with baseline. Dystonia rating scores were significantly increased until week 1, and dyskinesia rating scores were not significantly changed during the study. Laboratory parameters including vital sign, EKG, hematological, and biochemical values showed no significant changes during the trial. Conclusions : This study suggests that risperidone is generally safe and effective against both the positive and negative symptoms in our group of patients.

초등학교 자녀의 구강보건에 관한 학부모의 인식 및 행동

한수진,문혁수,정재연,김영경,이병진,김은경,정혜련 韓國學校保健學會 2001 韓國學校保健學會誌 Vol.14 No.1

The purpose of this study was to collect basic data for the development of oral health education program of parents and to encourage their actual interest and participation in school oral health program. The authors surveyed parents' awareness and behaviors about the oral health of their children. The subjects in this study were 193 parents of elementary school children in Seoul. The collected data were analyzed, the obtained results were as follows: 1. Thirty-five percent of the parents investigated paid a regular visit to a dental clinic. The must common tooth brushing time among them was after dinner, the second was after breakfast, and this was followed by before bedtime and before breakfast. 2. Ninety-four percent of the parents responded that prevention is necessary, 92.2% had a plan to visit a dental clinic to prevent dental caries, and 60.1% experienced receiving pit and fissure sealants. Ninety-seven percent responded that they did check their children's dental caries. 54.9% chocked their children's oral status after tooth brushing. The parents who visit a dental clinic on a regular basis were more likely to check their children's teeth after tooth brushing than those who don't(P<0.05). 3. Eighty eight percent of respondents wanted to keep the fluoride mouth rinse program. 4. It is recommended that an oral health education program be developed for parents to visit dental clinics on a regular basis, to educate as to the right tooth brushing time, and to check out their children's oral status after tooth blushing.

유압 인버터 엘리베이터에서의 극저속 속도제어를 위한 퍼지논리 제어기의 설계

한권상,김병화,이우철,장태호,이건학,사공석진,안현식,김도현 대한전자공학회 1999 夏季綜合學術大會 論文集 Vol.22 No.1

In this paper, a fuzzy logic controller is designed for speed control of a hydraulic inverter elevator. Mathematical modeling of an elevator actuated with hydraulic system is presented and the friction characteristics of a cylinder is examined, which may cause the abrupt increase of the acceleration in the zero-crossing speed region. Simulation results show that the proposed fuzzy logic speed controller yields a better control performance than conventional PID controller.

박판모자형부재의 최대압괴하중에 용접간격이 미치는 영향

韓秉基,洪性秀 弘益大學校 科學技術硏究所 1994 科學技術硏究論文集 Vol.4 No.-

In this study, the maximum crippling load of thin-walled hatted section tubes as various spot-welded spacing are investigated. The maximum crippling load of thin-walled hatted section tube is analyzed using ANSYS and model is tested under static load. Analysis results are compared with the experimental results.

공직사회 구성원들의 근로시간 단축에 따른 여가활동 실태 변화 연구

곽한병,안병훈 京機大學校 2006 論文集 Vol.50 No.-

This research has twfold purpose: Firstly we are going to investigate what changes government officals have undergone with their leisure activities after their working time reduced to five days from Monday thru Friday on July 1, 2005. Secondly we are going to suggest an alternative idea. For the empirical analysis, about 200 administrative officials who work for Song-Pa Gu office in Seoul were asked to reply to the survey, analysed by simple random sampling. The research shows some meaningful results. First of all, it shows that officials' recognition about leisure activity is very positive. Generally, regardless of their different background, we find that positive changes appear concerning leisure activity according to the five-day work system. Secondly, among various types of leisure activities the leisure for relaxationshows the most increase, followed by traveling, watching TV. listening to tile radio, and then watching a play or a movie. Thirdly, the degree of participation in the leisure activity proved to have a meaningfully negative affect on the job stress. This implies that more active participation in leisure activity made job stress decrease after introduction of five- day work system. fourthly, the degree of participation in the leisure activity proved to have a meaningfully positive affect on the satisfaction with job. This result implies that more active participation in leisure activities made the satisfaction with job Increase after introduction of five-day work system. In conclusion, officials' positive leisure activities have a great influence on their working ability. Therefore, we will have to make effort to provide adequate leisure infrastructure for work places, as well communities.

반도체스위치에 의한 고장전류제한기의 성능해석 모델

한병문 明知大學校 産業技術硏究所 1997 産業技術硏究所論文集 Vol.16 No.-

This paper describes a simulation model to analyze the perfomance of a solid-state resonant FCL(fault current limiter) on the power distribution system to reduce the short-circuit current through the distribution line. A single-phases equivalent circuit for a typical power distribution system is proposed for modelling purpose. The proposed FCL is assumed to be inserted in series with the distribution line to verify the current-limiting performance. Analysis results show that the resonant FCL with GTO is very effective considering present technological status of solid-state switching devices. The proposed resonant GTO FCL will be generally used in the power distribution system as more sensitive loads are involved and higher rating GTO will be developed continuously.

補剛平板의 비틀림 剛性測定에 관한 硏究

韓秉基,金天旭,金治均 연세대학교 산업기술연구소 1985 논문집 Vol.17 No.2

本 論文에서는 直交補剛平板에 純粹비틀림 모우멘트를 가하여 보강평판의 비틀림 剛性을 實驗的으로 解析하였다. 實驗은 2点支持 - 2点荷重 및 3点支持 - 1点荷重 方法으로 비틀림 모우멘트를 가하고 板의 中央点 및 荷重点의 처짐과 하중을 測定하여 비틀림 剛性을 구하였다. 두 實驗方法을 比較한 결과 後者의 方法이 정학하고 간단한 방법임을 알았다. 實驗의 정당성을 입증하기 위한 等方性平板의 비틀림 剛性의 측정은 理論값과 4% 이내로 잘 일치하였다. 補剛平板의 비틀림 剛性을 측정한 實驗값은 力學的 相互作用을 고려한 이론값과 비교적 잘 일치하며 補剛材 의 폭이 좁고 높이가 높을 때에는 14%의 오차를 보였다. The torsional rigidity of orthogonally stiffened plates is experimentally investigated by applying the pure twisting moment to the stiffened plate. The 2 point supporting-2 point loading condition and the 3 point supporting-1 point loading condition are employed to measure the loads and deflections at the center and loading points of the plate. The torsional rigidity is obtained from the experimental equation through the load-deflection slope. Comparing the above two experimental conditions, the 3 point supporting-1 point loading condition is found as a simple and accurate state in measuring the torsional rigidity. When compared with theoretical value for unstiffened plates, the experimental results performed for the validity of the two conditions show good agreement within 4%. For the orthogonally stiffened plates, the experimental result show relatively fair agreements with the theoretical values in which the mechanical interaction between plate and stiffener is considered. But, if the stiffener width is relatively narrow and the stiffener height increases, the deviation are in the range of 14%.

새로운 유사 원자층 증착 방법에 의한 산화막의 형성 및 터널링 자기 접합에의 응용

한신희,정원철,이장식,김병동,주승기 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.1

The tunneling barrier is crucial to the overall performance in magnetic tunnel junction. We have suggested a new formation method for the tunnel barrier, which has utilized pseudo atomic layer deposition with sputtering (PALDS). As is well known, all metallic thin films oxidize more or less under atmospheric conditions. With using this property of metallic thin films, we have prepared tunnel barrier by sputtering metallic thin film and exposing it to the oxygen ambience. From transmission electron microscopy (TEM) observation, the formed tunnel barrier has been confirmed to have clear and good interface between magnetic layers and tunnel barrier. From atomic force microscopy (AFM) observation, it has been also confirmed to have low surface roughness. The TMR MRAM cell manufactured using PALDS method has been shown to exhibit typical tunnel resistance of 86 KΩ·μm^2 and TMR ratio of about 40%. The 40% of MR is quite large. It is considered that this value is geometrically enhanced magnetoresistance due to the low junction resistance of MTJ.

철원산 현무암을 이용한 결정화 유리 제조

한상목,신대용,이병민,木村邦夫 강원대학교 부설 석재복합신소재 제품연구센터 1999 석재연 논문집 Vol.4 No.-

철원산 현무암에 Al₂O₃와 CaO를 각각 첨가하여 결정화유리를 제조하고 그 물리적 특성을 조사하였다. SiO₂8.3wt%, CaO 20wt% 그리고 Al₂O₃8.3wt%를 현무암에 첨가하여 단일상의 Diopside 와 Anorthite를 제조할 수 있었으며, CaO를 첨가한 경우에는 첨가된 CaO가 결정핵으로 작용하여 anorthite와 diopside의 혼합 결정상이 얻어졌으며, Anothite는 CaO 첨가량이 증가함에 따라서 감소하는 경향을 나타내었다. Al₂O₃를 현무암에 첨가하면 hercynite(FeO·Al₂O₃)의 분해에 의해 anorthite가 생성되고 있음을 알 수 있었다. CaO 20wt% 첨가한 경우 900℃에서 2.93g/㎤의 부피 비중과 215MPa의 곡강도를 Al₂O₃ 8.3wt% 첨가한 경우에는 1000℃에서 2.83g/㎤과 210MPa의 곡강도를 나타내었다. 흡수율은 Al₂O₃8.3wt%, CaO 15wt% 그리고 Cao 20wt% 첨가한 경우 모두 900℃ 이상에서 1% 이하의 낮은 흡수율을 나타내었으며, 열팽창계수는 Diopside의 peak intensity가 증가함에 따라 증가하였다. Glass-ceramics were prepared by adding CaO 8.3wt%, 15wt%, 25wt% and Al₂O₃8.3wt% to SiO₂ 8.3wt% added Chulwon basalt and their effects of phase transition and firing temperature on the densification, microstructure development and thermal expansion coefficient were investigated by means of XRF. SEM and diletometer. It was one phase of diopside and anorthite respectively. The CaO added to Chulwon basalt played an role of crystal site of anorthite and diopside. However anorthite decreased and finally disappeared according as CaO addition increased by 20wt%. In case of decomposition. The flexural strength of CaO 20wt% added glass-ceramics fired at 900℃ and Al₂O₃ 8.3wt% added glass-ceramics fired at 1000℃ was 215MPa and 210MPa respectively. The thermal expansion coefficient varied from 6.554×??/℃ to 8.146×??/℃ depending on diopside peak intensity of CaO added glass-ceramics on XRD results.