Probe 위치 변화에 따른 이음향방사의 변화

장봉익,이재욱,김상렬,강명구,김리석 대한이비인후과학회 1999 대한이비인후과학회지 두경부외과학 Vol.42 No.7

分子線에피택시에 의한 InGaAs 結晶成長과 다이오드 特性

金鳳烈 연세대학교 산업기술연구소 1982 논문집 Vol.14 No.1

The heteroepitaxial growth of In??Ga??????As on foreign substrate such as InP is investigated by MBE. Heteropitaxial growht of InGaAs on InP which aims the fabrication of photodiode has been studied. The lattice constant of InGaAs epilayer is very close to that of InP substrate and epitaxial p-n homojunction shows good rectification and photovoltaic characteristics. The crystallographic and optoelectronic properties of the hetero-and homojunction are also examined.

마이크로 스트립을 利用한 帶域通過 濾波器

金鳳烈,崔在夏 연세대학교 산업기술연구소 1978 논문집 Vol.8 No.1

A new class of microwave filters, hairpin-line and hybrid hairpin-line/half-wave parallel-coupled-line filters, has been studied in this paper. In order to obtain these filters, its input and output lines open-circuited at there ends were treated. This class of filters is well suited for microstrip realizations because grounding of the filter resonators is generally not required. The Epsilam-10 microwave substrate of dielectric constant 10.3 was used. These filters were constructed with 25-mil and 50-mil ground plane spacing. Its nominal design bandwidth and center frequency were 5 percent and 9.2 GHz. The experimental result for hairpin-line filter, surface-wave mode was excited, while the result for hybrid filter shows that surface-wave mode was not excited. Consequently, hybrid hairpin-line/half-wave parallel-coupled-line filters are suitable for MIC media.

태권도 선수의 성취동기, 불안 수준, 자기효능감과 경기력 간의 관계 분석

박창렬,고봉수 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5

The purpose of this study is to investigate the relationship among according to the achievement motivation, anxiety and self-efficacy levels on the performance of middle·high school Taekwondo athletes'. The subjects are 215 middle·high school Taekwondo athletes'. The independent variables of this study are achievement motivation, anxiety and self-efficacy of subjects, and dependent variables is athletic performance. The result are as follows: 1. The level of achievement motivation has an effect on the performance of middle·high school Taekwondo athletes'. The subjects who have high achievement motivation show superior performance than those of the low score. 2. The level of anxiety has an effect on the performance of middle·high school Taekwondo athletes'. The subjects who have low anxiety show superior performance than those of the low score. 3. The level of self-efficacy has an effect on the performance of middle·high school Taekwondo athletes'. The subjects who have high self-efficacy show superior performance than those of the low score.

하청 근로자들의 건강수준 평가

최홍열,고상백,장세진,차봉석,임형준,이상윤,김재용,강동묵,조수헌 大韓産業醫學會 2001 대한직업환경의학회지 Vol.13 No.1

목 적 : 하청노동을 이용한 노동 유연화 전략은 근로자들의 고용을 불안정시키고, 근로자들의 삶에 부정적 영향을 미치고 있다. 따라서 이 연구는 하청업체 근로자들의 고용현황을 조사하고, 기존의 업체중심의 건강평가의 문제점을 지적하고자 하였다. 또한 하청업체 근로자들의 건강평가의 현재적 의미와 사회적 배제의 특성을 알아보고자 하였다. 방 법 : 모기업과 하청업체 근로자들의 건강수준을 비교하기 위하여, 정기건강진단(일반, 특수)과 채용건강진단 자료를 이용하고자 하였다. 건강진단에서 누락된 비정규직을 포괄하기 위하여 SF-36을 이용하여 건강설문조사를 시행하였다.결 과 : 조선업 하청업체 근로자들의 고용기간은 짧고, 빈번한 노동이동 현상을 보였다. 3년간 건강진단 수검 현황을 통해 살펴볼 때, 1998년 수검자중 2000년까지 연속해서 검진 받은 수검자는 40.3%였다. 건강진단 결과 유소견자 규모를 통해 모기업과 하청업체간의 건강수준을 비교해 보았다. 모기업은 일반질병 요관찰자와 질병자를 포함한 유소견자가 1,011명으로 약 10 %의 유소견율을 보이고 있고, 질병자의 경우 596명으로 유병률이 5 %를 상회하고 있다. 반면 하청업체의 경우 1,967명의 수검자중 유소견자가 115명으로 6 %의 유소견율을 보이고있고, 질병자는 82명으로 4 %의 유병률을 보이고있다 채용건강진단을 받은 수검자는 6,260명 이었으며, 이 중 유소견자 수는 2,373명으로 전체 수검자의 37.9 %를 차지하였다. 건강설문지의 경우는 전체 건강수준의 총합은 하청보다 원청 근로자가 높았고 통계적으로 유의하였다. 결 론' 정기건강검진 결과는 하청근로자들이 고용형태에 따라 검진을 받지 못한 경우가 많아, 건강 근로자 효과로 표현될 가능성이 있다. 따라서 채용건강진단 결과는 다른 측면에서 하청업체 근로자들의 건강수준의 현실적 반영이라고 할 수 있다. 향후 하청업체 근로자들의 건강문제를 감시하고 개선하려면 기존의 업체 중심의 접근으로는 하청 근로자의 건강문제를 제대로 다룰 수 없고, 업종과 지역을 동시에 고려하여 접근할 필요가 있다. 또한 단기 고용 근로자 및 비정규직 근로자를 사회보장의 확충과 모기업의 연대책임 강화 및 기업복지 차원에서 포괄하는 방안이 모색되어야 하겠다. Objectives : The strategy for the labor flexibility through subcontracted labor have brought a negative effect on the lives of the workers, such as the increase of the unstable employment. This study was conducted to analyze the relationship between the employment of subcontracted firms and the health status of them, and to find out some problems which have been caused in the process of health evaluation and the characteristics of social exclusion. Methods : We reviewed the periodical health examination and preemployment health examination in order to compare health status of the subcontracted workers with those of the parent firm workers. The SF-36 questionnaire was administered to assess the self-perceived health status. Results : The result shows that compared to the working duration of the parent firm workers, those of the subcontracted workers were shorter, and the job transfer rate was higher. In the periodical health examination, the prevalence of occupational and general disease was higher in the parent firm(10%) than in the subcontracted firms(6%). Preemployment health examination plays an important role in worker's health manage- ment. Among 6,260 workers who received preemployment health examination, the prevalence of disease was 37.9%. Mean scores of health status measured by SF-36 were lower in the subcontracted firm than in the parent firm. Conclusions : Due to social exclusion of the subcontracted workers from the periodical health examination, there is a possibility that the periodical health examination have the healthy worker effect. These results suggests that the preemployment health examination could be a more appropriate indicator which is able to assess the health status of the subcontracted workers than the periodical health examination.

반응성 스퍼터링에 의한 전극 및 산화박막에 관한연구

김봉열,전계석,유상록 연세대학교 산업기술연구소 1980 논문집 Vol.12 No.2

Thin films of AI and ITO were prepared by RF diode sputtering and also the thin films of AIN were deposited by rf reactive sputtering. And then, the deposition rate, electrical resistivity and spectral transmission of these flms were investigated. It is obvious from the results that the sputtering input rf power strongly influenc es deposition rate of AI and ITO thin films. On the average characteristics of ITO thin films, the electrical resistivity was 4∼6×10­⁴Ω-cm and spectral transmission was more than 80%. When the partial pressure of nitrogen in argon nitrogen mixtures was increased, the deposition rate of AIN films began to decrease drastically at nitrogen partial pressure 2∼3×10­³ Torr, presumably the electrical resistivity of films began to increase rapidly, at the same critical pressure of nitrogen.

Thixotropic 유동계에 대한 연구

김봉오,박윤형,김응렬 漢陽大學校 環境科學硏究所 1991 環境科學論文集 Vol.12 No.-

Thixotropy는 시간의존성 shear thinning 현상이다. 그리고 thixotropy 는 entanglement-disentanglement 전환으로 가정할 수 있다. 1986년에 sohn 등은 shear stress 에 기인한 구조변화의 개념을 Ree-Eyring plastic 유동에 적용하여 간단한 thixotropc 유동 방정식을 유도하였다. 이 유동 방정식을 amylose와 amylopectin 수용액 그리고 수용성 silica 분산계 및 latax paints계와 PMMA sol계에 적용하여 이 thixotropic 유동 방정식의 유용성을 논의하였다. Thixotropy is the time dependent shear thinning phenomenon. And it is possible to postulate that thixotropy is the entanglement-disentanglement transition. In 1986, by introducing the concept of structural change caused by the shear stress into the Ree-Eyrng's equation of plastic flow, the modified and simple thixotropic equation was derived by Sohn etc. This thixotropic equation was applied to amylose and amylopectin solutions, aqueous silica dispersions, latex paints and PMMA sol system. And its usability was discussed.

액정을 이용한 가변 광차단 소자에 관한 연구

김봉열,엄영인 연세대학교 산업기술연구소 1980 논문집 Vol.12 No.1

An Optical Programmable Shutter(OPS) is fabricated using nematic liquid crystal and In ₂O ₃coated glass. The OPS has a structure of sandwitched and liquid crystal is injected between the coated glasses. The OPS is designed to be operated in the twisted-nematic (TN) system and shutter operation does not affected by neither the wavelength of light nor the polarity of driving signal. In the experiment, HeNe gas laser whose output light wavelength is 0.63㎛ and output power 0.95mW is used as a light source and bipolar periodic wave as a driving signal. The On/Off contrast in the shutter operation of OPS of 15:1 is achieved and minimum de-formation time 0.25msec is obtained in the experiment. A new model about the state deformation of the liquid crystal is suggested and by using this model, the threshold voltage dependence on the driving signal frequency is qualitatively explained.

페라이트 마이크로 스트립 EGW 써어큘레이터

김봉열 연세대학교 산업기술연구소 1975 논문집 Vol.6 No.1

A study is presented on "edge-guided-wave" circulators together with a physical description of the modes of propagation in microstrip line magnetized perpendicular to the ground plane. Nonreciprocal behavior is obtainable by asymmetrically loading the edges. Experiment on a edge-guided mode circulator fabricated on a ferrite substrate is presented. In this circulator, no lossy electrical materials are used and large isolation, small insertion losses were obtained in operating frequency 8-10 GHz.

전립선비대증에 대한 α₁-아드레날린 수용체 차단제와 5α-환원효소 억제제 병합요법의 효과

노준화,오봉렬,박양일 大韓泌尿器科學會 1998 Korean Journal of Urology Vol.39 No.12