HID LAMP 驅動을 위한 類似共振形 INVERTER에 관한 硏究

金光一,裵相俊 慶一大學校 1992 論文集 Vol.8 No.1

The cricuit of QRI(Quasi-Resonant Inverter) which is able to regulate frequency in the output voltage by the ZVS(Zero Volt Switching) was investigated. We found parameters in the circuit of QRI so that they have application to the HID(High Intensity Discharge) Lamp drive. Then we simulated that by personal computer and summarized the result of simulation.

經濟法序說

朴光緖 中央大學校 法政大學 學生會 1965 法政論叢 Vol.11 No.1

Corynebacterium hofmannii에 依한 전신감염 1예

문대혁,최강원,박석건,이광호 대한감염학회 1984 감염 Vol.16 No.1

Corynebacterium of hoffmannii is a part of normal pharyngeal flora. Human infection caused by C. hofmannii is very rare. All reported cases involve prosthetic or native cardiac valve. This patient sufered from chronic alcohlism, diabetes mellitus, and acute suppurative inflammation of brain, meninges and soft tissue. And he failed to show any clinical response to various antimicrobial therapy and died after discharge.

초등교원양성대학의 교육서비스품질과 학생만족도 및 충성도의 구조적 관계

곽민석(Kwag Min Seok),곽현규(Kwag Hyun Gyu) 학습자중심교과교육학회 2017 학습자중심교과교육연구 Vol.17 No.18

본 연구는 초등교원양성대학의 교육서비스품질과 학생만족도 및 충성도의 구조적관계를 분석하는데 그 목적이 있다. 모집단으로는 현재 전국교육대학교에 재학 중인 학생들을 선정하였고, 이 중 서울과 강원도, 충청도에 소재한 A대학교, B대학교, C 대학교 학생들을 2017년 6월 5일부터 23일까지 약 3주간 표본 집단으로 설정하여 연구를 진행하였다. 연구의 수행을 위해 설문지를 측정도구로써 사용하였으며, 총 234명의 자료를 분석하여 가설을 검증하였다. 자료 처리에는 Windows용 PASW 18.0과 AMOS 20.0 프로그램을 이용하였으며, 빈도분석, 신뢰도 분석, 확인적 요인분석, 상관관계분석, 구조방정식 모형분석을 통해 자료를 분석하였다. 본 연구의 결과는 다음과 같다. 첫째, 교육서비스품질은 학생만족도에 긍정적인 영향을 미치는 것으로 나타났다. 둘째, 교육서비스품질은 학생충성도에 영향을 미치지 않는 것으로 나타났다. 셋째, 학생만족도는 학생충성도에 긍정적인 영향을 미치는 것으로 나타났다. 마지막으로 교육서비스품질과 학생충성도 사이에서 학생만족도는 매개하는 것으로 나타났다. The current study was aimed to investigate the structural relationships among educational service quality, satisfaction, and loyalty. Data were drawn from 234 students in three different universities. PASW 18.0 for windows and AMOS 20.0 program were used for data processing. Data were analyzed using frequency analysis, reliability analysis, confirmatory factor analysis, correlation analysis, and structural equation modeling techniques. The results were as follows. First, educational service quality had a positive effect on satisfaction. Second, educational service quality did not affect loyalty. Third, satisfaction had a positive effect on loyalty. Lastly, satisfaction fully mediated the relationship between educational service quality and loyalty.

Binding of zinc(II) macrocycles toward carboxylate ligands

Kwag, Jin Suk,Kim, Ju Chang,Lough, Alan J.,Lee, Byung Min Springer-Verlag 2010 Transition metal chemistry Vol.35 No.1

Electrical Insulation Characteristics of a High-<tex> ${\rm T}_{\rm c}$</tex> Superconducting DC Cable

Kwag, D.-S.,Cheon, H.-G.,Choi, J.-H.,Kim, H.-J.,Cho, J.-W.,Kim, S.-H. IEEE 2008 IEEE transactions on applied superconductivity Vol.18 No.2

<P>A high temperature superconducting (HTS) DC cable is ideal for transmitting large amount of electrical power over a long distance. However, it must be designed to operate reliably within the constraints of the electrical systems. Therefore, a study of the electrical insulation is important to develop a HTS DC cable because it is operated in a cryogenic high voltage environment. This paper discusses the dielectric constructions of the cable and summarizes the experiment results on the DC and impulse dielectric characteristics of the insulation material, in sheet form and mini-model cable configuration. This shows how to design such insulation to be operated reliably. These studies are essential for the insulation design of a HTS DC cable operating in cryogenic environment.</P>

The Effects of Group Exercise, Manual Therapy and Home Exercise on Pain, Range of Motion and Function in Patient with Adhesive Capsulitis

Kwag, Kwang Il,Seo, Eun Kyoung,Kim, Tae Yoon 대한물리치료학회 2016 대한물리치료학회지 Vol.28 No.2

Purpose: The purpose of this study was to determine the effects of group exercise, manual therapy, and a home exercise program on VAS (visual analogue scale), ROM (range of motion) of shoulder, and functional outcome in adhesive capsulitis. Methods: The study was conducted with 45 patients. All subjects were randomly assigned to 3 groups: group exercise (n=15), manual therapy (n=15), home exercise (n=15). The subjects performed an intervention program 3 times a week for 4 weeks a total of 12 times. Outcome measurements were VAS, ROM, and Constant-Murley score outcome measures. Measurements were taken four times, at baseline, 4 weeks later, 8 weeks later, and 12 weeks later. Results: VAS, ROM of the shoulder, and functional outcomes showed improvement in all groups at the final follow-up (p<0.05). VAS and ROM showed greater improvement with group exercise and manual therapy than home exercise, however, there were no significant differences between the two groups (p>0.05). Functional outcomes showed the greatest improvement in group exercise at the final follow-up. This improvement was greater than with manual therapy or home exercise (p<0.05). Conclusion: Group exercise and manual therapy were more effective for improving pain, ROM, and function than home exercise in adhesive capsulitis. In particular, group exercise is more effective in functional recovery than other physiotherapy interventions.

Computation of Water and Air Flow with Submerged Hydrofoil by Interface Capturing Method

Kwag, Seung-Hyun The Korean Society of Mechanical Engineers 2000 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.14 No.7

Free-surface flows with an arbitrary deformation, induced by a submerged hydrofoil, are simulated numerically, considering two-fluid flows of both water and air. The computation is performed by a finite volume method using unstructured meshes and an interface capturing scheme to determine the shape of the free surface. The method uses control volumes with an arbitrary number of faces and allows cell wise local mesh refinement. The integration in space is of second order, based on midpoint rule integration and linear interpolation. The method is fully implicit and uses quadratic interpolation in time through three time levels. The linear equations are solved by conjugate gradient type solvers, and the non-linearity of equations is accounted for through Picard iterations. The solution method is of pressure-correction type and solves sequentially the linearized momentum equations, the continuity equation, the conservation equation of one species, and the equations for two turbulence quantities. Finally, a comparison is quantitatively made at the same speed between the computation and experiment in which the grid sensitivity is numerically checked.

A STUDY OF 2-D IMAGE RECONSTRUCTION using PARALLEL BEAM PROJECTIONS IN IBM PC

Kwag, Jung Geun 대구보건대학 1996 대구보건대학 論文集 Vol.16 No.-

영상재구성기법은 잘 알려진 영상처리기법으로서 주로 X-ray단층촬영기, NMR 그리고 CT 등에 쓰인다. 영상재구성의 목적은 프로젝션들로부터 목적물의 절단면의 영상을 얻는 것이다. 본 연구에서는 2차원 영상재구성기법에 관한 기본개념 및 수식을 설명하였다. 또한, 평형 주사방식에서 2차원 영상재구성인 Inverse Radon Transform, Filtered Back-Projection 혹은 Convolution Back-Projection에 대하여 설명하고 Filtered Back-Projection 알고리즘과 Convolution Back-Projection 알고리즘으로 IBM-PC 586팬티엄에서 컴퓨터시뮤레이션하고 검토하였다. 이상으로 종래의 고가의 컴퓨터에서 실행하던 것을 IBM-PC 586팬티엄에서 실행하므로서 NMR 및 CT의 가격저렴화를 기할 수 있다고 본다.

A REVEIW OF ELECTRON BEAM TESTING

Kwag, Young Jik 수원대학교 산업기술연구소 1988 산업기술연구소논문집 Vol.3 No.-

작은 chip속에 복잡한 회로가 집적되어 놀라운 기능을 가진 고도집적 IC가 개발되어 computer는 물론 많은 전자기기에 사용하게 되어 전자혁명을 가능하게 하고 있다. 고도 집적회로(LSI)를 개발하는 데는 많은 인력과 개발비를 필요로 하게 되는데 개발과정에서의 개발경비를 줄이고 생산과정에서의 수율을 높이기 위해서는 집적회로내의 불량점을 정확하게 찾아낼 수 있는 정확한 측정기기를 필요로 한다. 주사형 전자현미경(SEM)을 이용하여 집적회로내의 불량점을 찾으려는 종래의 노력은 주사형 전자현미경의 beam의 직경이 측정하고자 하는 집적회로내의 line의 넓이보다 커서 그 목적을 달성할 수 없다. 집적회로내의 불량점을 찾아내기 위해서는 beam의 직경이 측정하고자 하는 점의 line 넓이의 1/5을 넘지 말아야 하므로 beam의 직경은 0.1um-02um을 넘지 말아야 하며, 측정하고자 하는 집적회로가 파괴되지 않고 정확한 결과를 얻기 위해서는 가속전압 1 kv 이하에서 beam의 전류가 InA이어야 한다. 이러한 목적을 달성하기 위해서 주사형 전자현미경을 개조하여 개발된 것이 Electron Beam Testing (EBT)이다. 1975년경 부터 개발되어 사용하게 된 EBT의 방법과 그 응용에 대하여 그간에 발표된 논문들을 중심으로 정리했다.