QT연장 증후군 환자에서 Head-Up Tilt Test에 의해 유발된 Torsades De Pointes 1례

전익수,차태준,김길수,김동완,김규종,김찬욱,김성만,주승재,이재우 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.8

PWM 인버터 시스템에서의 전도노이즈 저감을 위한 출력필터 설계에 관한 연구

金利勳,朴奎炫,元忠淵,金榮石,崔世琓 성균관대학교 2002 학술회의지원논문목록집 Vol.2002 No.-

본 논문에서는 PWM 인버터-유도전동기 구동시스템의 전도노이즈 저감을 위한 출력필터 설계에 관한 연구를 수행하였다. 전도 노이즈는 고전압 압력, 고용량 구동시스템, 그리고 긴 전동기 터미널 등의 경우에서 크게 문제가 된다. 고압력을 갖는 시스템에서는 높은 압력에 비례한 직류 링크 전압을 갖고 이에 따라 스위칭 시 dv/dt가 순간 최대 CM 접지전류를 발생시킨다. 그러므로 이에 대한 대책에 필요하다. 따라서 최근 산업 현장에서 많이 사용되고 있는 PWM 인버터를 설계 제작하여 유도전동기를 구동하고 이에 따라 발생되는 전도노이즈 성분을 감쇠 시킬 수 있는 출력필터를 설계하였고 제작 및 실험을 통하여 그 타당성을 입증하였다. In this paper, filtering techniques to reduce the adverse effects of motor leads on high-frequency PWM inverter fed AC motor drives are presented. The filter was designed to keep the motor terminal from the cable surge impedance to reduce overvoltage reflections, ringing, and the dv/dr, di/dt, at the motor terminals. Specially, the output filter is used to limit the rate of the inverter output voltage and reduce common mode noise to the motor. The performance of the output filter is evaluated through simulations and experiment on PWM inverter-fed AC motor drive. An experimental PWM drive system reduction of conducted EMI was implemented on an available TMS320C31 micoprocessor controd board. Finally, experimental result shows inverter output filter reduces more common mode voltage than low pass filter also reduce overvoltage and ringing at the motor terminal.

수준별 탐구 활동이 중학생들의 단진자운동 학습에 미치는 효과

김규용,강경완 濟州大學校 師範大學 科學敎育硏究所 1999 科學敎育 Vol.16 No.-

This study aims a t research into more effective teaching method through comparative analysis between traditional teaching-learning and level inquiry teaching-laming the class on motion of the simple pendulm in the middle school. First of all, the students was divided into two types of class, control class and experimental class. The teaching material was designed according to education course and the students of control class have taken the lesson without variation. On the other hand, the students of the experimental class divided into two groups with higher and comn ability level. Then learning and teaching material was made out in line with level. So, the students of expenmental class shifted by level. The results of the study follow as this ; There is no difference between traditional teaching-learning and level inquiry teaching-learning for students' understanding simple concept about the motion of simple pendulm and frequency. But level inquiry learning was more effective for learning research of the factor affecting the period, frequency and isochronism of pendulm But level inquiry teaching-laming should need some complement to make improvement in students understanding them as a whole.

동일한 분류 알고리즘 하에서 상이한 언어의 실행시간에 관한 고찰

金完奎,金昌根 진주산업대학교 1989 論文集 Vol.27 No.-

What are relatrve to Run-time of computer langurage for one another under the same sort algorithm and influence the time of sorting are divided into three parts. The first is the character of algorithm, the second is the character of computer system, and the third is the character of languages, and to find effective language under the same algorithm and same system. Each language has its own speed of sorting under same algorithm, same system and same data. Pascal is the fastest of all and Fortran is the next one. Cobol is the latest one among them because Pascal and Fortran approach the character of algorithm descriptive language, but cobol don't. Pascal and Fortran is good for algorithm language, but Cobol is not.

CORBA 클라이언트/서버 구조의 자바 통합 개발 환경의 설계 및 구현

김완수,김흥준,박순규 진주산업대학교 2000 산업과학기술연구소보 Vol.- No.7

Today, most of the well-known software development tools and methods faced with problems of scalability, modularity, granularity, and maintenance. These problems result in the fact that these tools and methods are standalone. In this paper, we propose a design and implementation of software development environment for Java application based upon CORBA-based Client/Server model. Proposed model has facilities to overcome a problem caused by updates and its distribution and is possible to overcome problems of scalability, modularity and granularity because it based upon Client/Server model.

청평사 원림의 식생경관

김상규,박완근,윤영활 강원대학교 조형예술연구소 2008 조형예술연구 논문집 Vol. No.9

In this study, the detail plants were analyzed by relating to the geographical configuration of the ground as using the basic data of the plants in the whole area of Mt. Obong and focusing on each detail space of the relics in the Zen garden of Cheongpyeongsa. Mt. Obong, which Cheongpyeongsa is located in, contains 434 different species of vegetation and the typical communities are of Pinus densiflola and Quercus mongolica. There are various types, a coniferous forest, a deciduous forest and a mixed forest. The typical landscape plants observed in the old literatures are Pinus densiflola, Pyrus ussuriensis and Taxus cuspidata. As the landscape plant maintained from the past, two trees of Taxus cuspidata, which have existed until now from the era of the Goryeo Dynasty, and Keria japonica for. plena, which is assumed that it had been planted in the beginning of the Joseon Dynaty, remain in the precincts, the Youngji and the Seocheon district.

포인터 변수를 이용한 동적 자료구조의 구현에 관한 연구

金完奎 진주산업대학교 1990 論文集 Vol.28 No.-

This study is purposed to investigate that whether it is best to use a pointer-based or array-based implementation of lists in a given circumstance. Table 1 shows the comparison of methods. The principal issues to consider are the following. 1. The array-based implementation requires us to specity the maxium size of a list at complie time. If we cannot put a bound on the length to which the list will grow, we should probably choose a pointer-based implementation. 2. The array-based implementation may waste space, since it uses the maximum amount of space independent of the number of elements actually on the list at any time. The pointer-based implementation uses only asmuch space as is needed for the elements currently on the list, but requires space for the pointer in each node. Thus, either method could wind up using more space than the other in differing circumstances.

급냉응고된 Mg-Zn-Ca 합금의 시효특성에 관한 연구

金完哲,朴廷珪 홍익대학교 산업기술연구소 2000 産業技術 Vol.10 No.-

In this study, the transition of microstructure, precipitation behavior and influence of precipitate phases on hardness were investigated in the Mg-Zn-Ca alloys made by the melt spinning method. The hardness of strip increased with the addition of Ca and Zn. Hardening seems to be caused by the crystallization of Mg_2Ca and Mg_2Zn_3 particles, and also by the refinement of grains by the Ca addition. In the aging treatment at constant temperature, age hardening was found to occur. Maximum hardness was obtained at 200℃, followed by the decrease in hardness as the temperature was raised above 200℃. When the Zn content was over 10wt%, however, age hardening effect was not observed. Mg_2Ca and Mg_2Zn_3 particles were precipitated by aging treatment. In the aging treatment of 1.5wt% Ca alloys, spherecal precipitates were formed inside a grain, and eutectic precipitates both inside a grain and along the grain boundary. In the aging treatment of 5wt% Ca alloys, spherecal precipitates and very fine dispersive precipitates were formed. It may be concluded that formation of the dispersive precipitation is the major mechanism for the age hardening.

냉연한 Cu-10Zn 황동의 재결정립 핵생성에 관한 연구

金容圭,金完哲 홍익대학교 산업기술연구소 1993 産業技術 Vol.2 No.-

The effect of heating on the microstructure of cold rolled Cu-10Zn brass is described. Almost all of the inhomogeneities of deformation that occur in the microstructure of heavily deformed fcc metals and alloys can be observed in cold rolled Cu-10Zn brass and potentially each of these is a site for the nucleation of recrystallized grains. In 90% cold rolled brass the first nuclei developed in brass type shear bands and this nucleation process was associated sometimes with the lateral growth of recovery twins but also with subgrain coalescence and boundary migration processes. Nucleation also occured at interfaces between different types of inhomogeneity. The results are discussed with reference to the currently accepted view.

비유기중의 소유방염에 대한 항균펩타이드(Buforin Ⅱb)의 효능실험

김인송,권성균,임형준,이완규 한국수의공중보건학회 2002 예방수의학회지 Vol.26 No.3

Recently, a novel antimicrobial peptide including Buforin II has been emphasized to kill multi-drug resistant bacteria and avoid promoting multi-drug resistance. This study evaluated the efficacy of an antimicrobial peptide (Buforin IIb) on bovine mastitis. Based on the Minimum inhibitory concentration(MIC, 4 g/ml) of Buforin IIb, syringes were made five concentration(MIC×10, ×50, ×100, ×300, and ×500). Thirty three cows(38 quarters) with bovine mastitis were selected using California mastitis test and grouped in dependant on drug concentration and treatment duration. Each group treated by intramammary infusion twice a day for 3 5 days. The milk samples of 5 groups were aseptically collected from quarters at 0, 3, 7 and 14 days, and 2 groups were collected at 0, 5, 9 and 14 days after first treatment. Collected samples were used for bacterial culture and somatic cell count. Bacterial number(log_(10) mean CFU/ml) was decreased in dependant on drug concentration and extending treatment duration. In group D(MIC×300), bacterial number was decreased from 4.59±0.10(day 0) to 2.89±1.37(day 3), 4.04±0.33(day 7), and 4.19 ± 0.10(day 14), respectively(p 0.05). Bacterial number of B2(MIC×50, 5 days treated) is decreased, approximately 10%, than group B1(MIC×50, 3 days treated). Somatic cell count of group D was slightly decreased from 11,100(×10³)(day 0), to 7,386(×10³)(3 day), 6,886(×10³)(day 7), and 9,661(×10³)(day 14). Staphylococcus spp., was the most common isolate, was bacteriologically cured 100% by Buforin IIb treatment. Overall results indicate that Buforin IIb could have possibility to cure bovine mastitis, if higher concentration over experimental concentration were treated with extending treatment duration.