전외측 대퇴부 천공지 피판을 이용한 하지 연부조직 결손의 재건

김경철,정재익,김성언,김학수,류인혁,Kim, Kyung-Chul,Chung, Chae-Ik,Kim, Seong-Eoun,Kim, Hak-Soo,Rhyou, In-Hyeok 대한미세수술학회 2006 Archives of reconstructive microsurgery Vol.15 No.2

This study investigated the clinical application of anterolateral thigh (ALT) perforator flap in reconstruction of soft tissue defect of lower extremity. There were twenty-one patients who had been taken soft tissue reconstruction with anterolateral thigh perforator flap. There were 19 males and 2 females between 3 and 65 years (mean, 36 years). This study included 4 cases of pedatric case of under 10-year-old. All cases were a cutaneous flap. Flap size averaged $160\;cm^2\;(20{\sim}450\;cm^2)$. 19 cases were musculocutaneous perforator flaps and 2 were septocutaneous perforator. T-shaped pedicle were used to reconstruct and to preserve major artery of lower extremity in 2 cases. 19 cases flaps survived completely and 2 cases flap were marginal necrosis partially. There was venous congestion in one case of type of reverse island flap but that was improved after salvage procedure with leech. While the donor sites were closed directly in 5cases, 16 cases underwent skin graft. ALT flap is suitable for coverage of defects in lower extremity where have various condition and reliable in children as in adult.

보건의료전문가의 고령친화용품 수요 및 품질에 대한 예비조사연구 - 한방용품 및 생활용품 중심으로-

김경철,김이순,김규곤,문인혁,황이철,권자연,신순식,Kim, Gyeon-Cheol,Kim, Yi-Soon,Kim, Kyu-Kon,Moon, In-Hyuk,Hwang, Lee-Cheol,Gwon, Ja-Youn,Shin, Soon-Shik 대한동의생리학회 2006 동의생리병리학회지 Vol.20 No.6

This is a pilot study to survey the general demand of senior-assistive necessities before a standardization system for senior-assistive necessities is developed as well as to describe health professionals' opinions about the demand and quality of Oriental medical aids and necessities for daily living for the elderly. This is a descriptive survey in which 29 health professionals are questioned, using structured questionnaires based on ISO 9999. The questionnaires were developed by 7 expert conduction standardization system of senior-assistive products in Korea. The data is analyzed by descriptive statistics. The result is as follows : First, with regard to the demand for all of the items in Oriental medical aids for the elderly, the demand of cupping glasses is the highest, followed by instrument used to apply heat treatment, massage equipment, thermo-therapeutic mattress, and heat or ice packs. With regard to the demand for all of the items for the necessities for daily living for the elderly, chairs are the highest, followed by rolling chairs, beds for health, and heigh adjustable beds. Second, with regard to quality of Oriental medical aids, ${\ulcorner}$aids for hair care${\lrcorner}$ are the best, whereas ${\ulcorner}$aids for boiling Oriental medicine${\lrcorner}$ are the worst. In quality of the necessities for daily living, ${\ulcorner}$chairs${\lrcorner}$ are the best, whereas ${\ulcorner}$beds${\lrcorner}$ are the worst. Above all, this result shows that with ${\ulcorner}$aids for heat or cold treatment${\lrcorner}$, there is relatively high demand and low quaily of Oriental medical aids, and with ${\ulcorner}$Beds${\lrcorner}$, there is relatively high demand and low quality. Therefore, aids for heat or cold treatment and beds in th necessities for daily living are required to be developed for standardization of senior-assistive necessities.

맥진기 연구개발에 대한 수요조사

김경철,김종환,신우진,이해웅,강희정,Kim, Gyeong-Cheol,Kim, Jong-Hwan,Shin, Woo-Jin,Lee, Hai-Woong,Kang, Hee-Jung 대한예방한의학회 2009 대한예방한의학회지 Vol.13 No.1

The demand of research for the development of pulse meter and analyzer by the examination questionnaire made from repeated preliminary investigations. Which was presented in the exhibition KIMES 2008, it's has been proved to be practical. 159 people(oriental medical doctor) sent in the question papers and selected the double answers in the relevant question. At the time of the development of the pulse meter and analyzer, we put the investigation for oriental medical doctor's demands in practice and found the following results. The development of the pulse analyzer is getting more important for modernization of oriental medicine. The purpose of this study was to find out the research needs for the pulse analyzer considering the practical use in the oriental medical clinics. A survey was conducted at the KIMES 2008 exhibition with a set of questionnaires. We collected the data from 159 oriental medical doctors who attended the exhibition, and we found following results. The more oriental doctors did not think the diagnostic devices were important in their clinical practices. Most responders preferred to use the Chon-Kwan-Cheok pulse diagnosis. To find out the mechanism of the pulse diagnosis and to standardize it, the clinical data base containing the results of the pulse diagnosis and the patten discrimination of each patient should be established. In conclusion, the researches on the standardization of Chon-Kwan-Chuk pulse diagnosis including the measurement techniques and the pulse-pattern correlations are very important for developing the pulse analyzer.

시간에 따라 변하는 전기로 부하의 고조파 측정 및 평가

김경철,진성은,박상영,이주홍,이일무,전영수,Kim, Kyung-Chul,Jin, Seong-Eun,Park, Sang-Young,Lee, Joo-Hong,Lee, Il-Moo,Jeon, Young-Soo 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.1

규모가 큰 제철소는 전기로를 포함한 비선형 부하를 가지고 있고, 고조파 측정 결과 시간에 따라 변하는 고조파 파형이 관측 되었다. 부하 용량이 매우 크기 때문에 전력회사에 미치는 영향이 클 뿐만 아니라 이웃 수용가의 전력시스템에 주는 충격도 고려하여야 한다. 본 논문에서는 시간에 따라 변하는 고조파를 국제 기준인 IEEE 519와 IEC 61000-3-6에 의해 누적확률을 사용하여 평가하였다. Large steel industries have nonlinear loads including electric arc furnaces and harmonic field measurements have shown that harmonic content of a waveform varies with time. Since the large loads are supplied from the power system grid, it must be recognized that not only will the system of utility be impacted, but neighboring customer system could be impacted as well. In this paper time-varying harmonics are evaluated by international harmonic standards IEEE Std. 519 and IEC 61000-3-6 using a cumulative probablistic approach.

증기터빈에서 패킹 씰이 터빈 성능에 미치는 영향에 대한 비교 연구

김경철,Kim, Gyeong-Cheol 한국열병합발전협회 2000 열병합발전 Vol.14 No.-

현장시험에 의한 고속전철 부하의 고조파 시뮬레이션에 관한 연구

김경철,김유준,Kim, Kyung-Chul,Kim, You-June 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.6

고속전철 부하는 동기 전동기를 제어하기 위해 컨버터와 인버터를 포함한 많은 비선형 부하를 가지고 있다. 고조파 측정 결과로 고조파는 시간에 따라 변하는 특성이 관측되었다. 순시치 측정에 의한 고조파 평가는 측정 순간에 따라 고조파가 다를 수 있으므로 모호한 결과를 초래할 수 있다. 시간에 따라 변하는 고조파를 해결하기 위해 쓰이는 가장 보편적인 방법은 누적확률을 사용하는 것이다. 고조파 시뮬레이션은 사례연구 시스템의 전압 및 전류 왜곡을 평가하기 위해 이용되었다. 본 논문에서는 고속전철 부하의 고조파 현장 측정, 국제 고조파 관리 기준인 IEC 61000-3-6과 IEEE Std. 519에 의한 고조파 평가, EDSA 프로그램을 사용한 시뮬레이션을 심도있게 다루고자 한다. High speed electric trains have nonlinear loads including converters and inverters for the control synchronous motors. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probablistic approach is the most commonly used method to solve time varying harmonics. Harmonic simulations are performed to evaluate the harmonic voltage and current distortions throughout the system. This paper provides an in depth analysis on harmonics field measurement of the high speed electric train loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519-l992, and harmonics simulation using EDSA program for the case study.

접지 임피던스가 중성선 고조파 전류에 미치는 영향

김경철,백승현,이일무,김종욱,Kim, Kyung-Chul,Paik, Seung-Hyun,Lee, Il-Moo,Kim, Jong-Uk 한국조명전기설비학회 2004 조명·전기설비학회논문지 Vol.18 No.3

스위칭 모드 전원 공급 장치와 같은 비선형 부하의 증가로, 3상 4선식 배전계통을 채용하는 중성선에 많은 고조파 전류가 흐른다. 중성선은 접지 시스템과 연결되어 있기 때문에 접지 임피던스는 중성선 고조파 전류에 영향을 끼친다고 알려져 있다. 현장에서 실측한 고조파 전류와 전압으로 고조파 해석용 3상 등가 회로를 구성하였다. 실측한 값과 MATLAB으로 시뮬레이션 한 값을 수치와 파형으로 비교 검토하였다. 또한 본 논문에서는 중성선 고조파 전류와 접지 임피던스와의 관계를 시뮬레이션을 통해 검증하였다. With the proliferation of nonlinear loads such as switching mode power supplies, high neurtral harmonic currents in three-phase four-wire distribution system have been observed. It has been known that the grounded impedance has an effect on the neutral current of a system which operates with harmonics present since the neutral conductor is grounded. On-site measurements of harmonic currents and voltages were made and the corresponding equivalent circuit was developed. The circuit model under study was simulated numerically and graphically through the use of the software MATLAB. Simulation results verifying the relationship between the neutral harmonic current and ground impedance are presented.

시간에 따라 변하는 전기로 부하의 고조파 측정, 평가 및 시뮬레이션에 관한 연구

김경철,진성은,이주홍,전영수,Kim, Kyung-Chul,Jin, Seong-Eun,Lee, Joo-Hong,Jeon, Young-Soo 한국조명전기설비학회 2006 조명·전기설비학회논문지 Vol.20 No.5

규모가 큰 제철소는 전기로와 같은 비선형 부하를 가지고 있다. 고조파 측정 결과로 고조파는 시간에 따라 변하는 특성이 관측되었다. 순시치 측정에 의한 고조파 평가는 측정 순간에 따라 고조파가 다를 수 있으므로 모호한 결과를 초래할 수 있다. 시간에 따라 변하는 고조파를 해결하기 위해 쓰이는 가장 보편적인 방법은 누적확률을 사용하는 것이다. 고조파 시뮬레이션은 사례연구 시스템의 전압 및 전류 왜곡을 평가하기 위해 이용되었다. 본 논문에서는 전기로 부하의 고조파 현장 측정, 국제 고조파 관리 기준인 IEC 61000-3-6과 IEEE Std. 519에 의한 고조파 평가, 시간에 따라 변하는 고조파의 시뮬레이션을 심도 있게 다루고자 한다. 고조파 해석 프로그램인 EDSA는 사례 연구에 시뮬레이션 도구로 사용되었다. Large steel industries have nonlinear loads such as electric arc furnaces. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. Direct application of the harmonic assessment to the snapshot measurements would result in ambiguous conclusions depending on which instant is sampled. A cumulative probablistic approach is the most commonly used method to solve time-varying harmonics. Harmonic simulations are performed to evaluate the harmonic voltage and current distortions throughout the system. This paper provides an in depth analysis on harmonics field measurement of the electric arc furnace loads, harmonics assessment by the international harmonic standards IEC 61000-3-6 and IEEE Std. 519 and harmonic simulation for the time-varying harmonics. The EDSA program was used as a simulation tool for the case study.

실측에 의한 특고압 수용가의 고조파 평가에 관한 연구

김경철,김유준,Kim, Kyung-Chul,Kim, You-June 한국조명전기설비학회 2007 조명·전기설비학회논문지 Vol.21 No.3

전기로를 포함하는 비선형 부하를 가진 규모가 큰 제철소는 특고압 수용가이다. 이득 비선형 부하는 고조파 전류를 발생시키고, 전력계통의 전압을 왜곡시킨다. 고조파 측정결과로 고조파는 시간에 따라 변하는 특성을 가지고 있었다. 시간에 따라 변하는 고조파를 해결하기 위해 쓰이는 가장 보편적인 방법은 누적확률을 사용하는 것이다. 본 논문에서는 전기로 부하의 시간에 따라 변하는 고조파를 국제 고조파 기준인 IEC 61000-3-6, IEEE 519와 JIS C 61000-3-2에 의해 평가하고자 한다. A large steel industry which has nonlinear loads including electric arc furnaces is one of the extra high voltage customers. These nonlinear loads generate harmonic currents and create distortions on the sinusoidal voltage of the power system. Harmonic field measurements have shown that the harmonic contents of a waveform varies with time. A cumulative propablistic approach is the most commonly used method to solve time varying harmonics. In this paper the in varying harmonics of electric arc furnace loads are evaluated by international harmonic standards(IEC 61000-3-6, IEEE 519 and JIS C 61000-3-2).

터빈성능시험 절차 및 계산

김경철,Kim, Gyeong-Cheol 한국열병합발전협회 1998 열병합발전 Vol.8 No.-