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.

Can a securities law improve investor rationality in processing earnings information?

Kwag, Seung Woog The Korean Data and Information Science Society 2014 한국데이터정보과학회지 Vol.25 No.6

In this paper, I propose a general hypothesis that after the enactment of the Sarbanes-Oxley Act (SOA) financial statements convey more accurate and reliable corporate information to investors who in turn reflect such improvements in stock prices and test four practical hypotheses that simultaneously feature the degree of information asymmetry, forecast bias, and investor reaction to biased earnings information. The empirical results unanimously suggest that the post-SOA investors take advantage of the improvement in informational efficiency and accuracy and actively adjust for analyst forecast bias in earnings forecasts. The SOA indeed appears to achieve its primary goal of investor protection.

The Impact of Sarbanes-Oxley Act on Earnings Management, Return, and Risk

Kwag, Seung Woog(Austin) 한국상업교육학회 2012 상업교육연구 Vol.26 No.2

2002년도에 통과된 사베인즈 옥슬리 법은 미국 증권법 역사의 한 획을 긋는 중요한 이벤트이다. 이 법으로 말미암아 미국내 기업 관리의 체계가 근본적으로 바뀌게 되었다. 본 연구는 사베인즈 옥슬리 법이 그동안 광범위하게 실행되어온 비건전성 기업이 윤관리, 주식수익율, 그리고 체계적 시장위험의 구조적 변화에 미친 영향을 컨틴전시 분석법을 이용하여 조명한다. 컨틴전시 분석 결과에 따르면 사베인즈 옥슬리 법이 비건전성 기업이윤관리 관행을 줄이고, 보다 높은 주식수익율을 실현하는데 기여하며, 시장위험의 구조적 상승을 이끈 것으로 판단된다. 대부분의 미국의 주에서 비슷한 현상을 보여주고 있다. 또 하나의 흥미로운 결과는 시간이라는 요인를 통제를 할 때 비 건전성 기업이윤관리가 주식수익율과는 직접적 상관관계는 없다는 것이다. 연구결과를 종합할 때 사베인즈 옥슬리 법이 미국시민의 증권시장에 대한 신뢰회복이라는 입법취지를 달성한 것으로 판단된다. The Sarbanes-Oxley Act of 2002 (SOA) is one of the most significant additions to the U. S. securities laws and has fundamentally changed the landscape of corporate governance and disclosure in the U. S. This paper investigates whether the SOA discourages the widespread practice of earnings management, enhances stock returns, and causes a structural change in market risk. The contingency analysis suggests that the enactment of the SOA indeed deters earnings management, leads to higher stock returns, and results in a significant upward shift in market risk. The majority of states share these changes. Another interesting finding is that earnings management is not directly associated with stock returns when the time effect is controlled. Drawing upon the empirical results, the SOA appears to achieve its major goal of recovering investor confidence in the U. S. financial markets.

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>

Facile synthesis of partially uncapped liposomes

Kwag, Dong Sup,Park, Kyeongsoon,Youn, Yu Seok,Lee, Eun Seong Elsevier 2015 Colloids and surfaces. B, Biointerfaces Vol.135 No.-

<P><B>Abstract</B></P> <P>Sophisticated control of the assembly of nano-sized structures to achieve desired properties is one of the most efficient techniques in drug carrier design. In this study, we hypothesized that under magnetic shear stress, high-density superparamagnetic Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles dispersed in a liposome would apply a high load in a particular direction to a liposome membrane and ultimately generate open lipid bilayer holes. Indeed, the designed experimental conditions enabled the formation of one or multiple open pore sites in liposome membranes. With this evidence, open lipid bilayer holes in liposome membranes were further used as open entrances for proteins (bovine serum albumin or insulin) into the liposomes prior to the natural recovery (<I>i.e.</I>, closing) of the lipid bilayer holes. This trial will provide potential opportunities for the engineering of functional liposomes for protein drug delivery.</P> <P><B>Highlights</B></P> <P> <UL> <LI> We developed a new fabrication method for partially uncapped liposomes using Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles. </LI> <LI> Under magnetic shear stress, Fe<SUB>3</SUB>O<SUB>4</SUB> nanoparticles dispersed in a liposome ultimately generated open lipid bilayer holes. </LI> <LI> This method is simple and safe for biomedical and cosmetic application. </LI> </UL> </P>

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.

Hyaluronated fullerenes with photoluminescent and antitumoral activity

Kwag, Dong Sup,Park, Kyeongsoon,Oh, Kyung Taek,Lee, Eun Seong The Royal Society of Chemistry 2013 Chemical communications Vol.49 No.3

<P>Hyaluronated fullerene has strong near-infrared (NIR) fluorescence intensity without labelling with any fluorophores or isotopes. This fullerene allowed high-resolution fluorescent imaging of tumor sites <I>in vivo</I> and resulted in a significant regression of HCT-116 tumors.</P> <P>Graphic Abstract</P><P>Hyaluronated fullerene has strong near-infrared (NIR) fluorescence intensity without labelling with any fluorophores or isotopes. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c2cc36596k'> </P>