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.

Who are you?

Kwag, Hyo Jung 한국콘텐츠학회 2023 ICCC International Digital Design Invitation Exhib Vol.2023 No.12

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>

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.

Breakdown Characteristics of Insulation Materials for a Termination of Power Transmission Class HTS Cable

Kwag Dong-Soon,Cheon Hyeon-Gweon,Choi Jae-Hyeong,Kim Sang-Hyun The Korean Society of Superconductivity and Cryoge 2006 한국초전도저온공학회논문지 Vol.8 No.2

A research on several characteristics such as volume breakdown and surface discharge of insulators for a termination of power transmission class HTS cable was performed. We investigated the surface discharge of glass fiber reinforced plastic (GFRP) under air, cryogenic nitrogen gas and nitrogen gas media. The breakdown characteristics of these media were studied. Experimental results revealed that flashover voltage greatly depends on pressure, temperature, the kinds of insulating media and voltages, but it is slightly affected by shape and material of electrode. The breakdown voltage of liquid nitrogen, cryogenic nitrogen gas and nitrogen gas deeply depends on the shape and dimension of electrode, kinds of voltages and pressure. Moreover, the breakdown voltage of cryogenic nitrogen gas and flashover voltage of GFRP in the cryogenic nitrogen gas is also influenced by temperature and vapour-mist density of the gas.

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>

Mitigation of seismic responses of actual nuclear piping by a newly developed tuned mass damper device

Kwag, Shinyoung,Eem, Seunghyun,Kwak, Jinsung,Lee, Hwanho,Oh, Jinho,Koo, Gyeong-Hoi Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.8

The purpose of this study is to reduce seismic responses of an actual nuclear piping system using a tuned mass damper (TMD) device. A numerical piping model was developed and validated based on shaking table test results with actual nuclear piping. A TMD for nuclear piping was newly devised in this work. A TMD shape design suitable for nuclear piping systems was conducted, and its operating performance was verified after manufacturing. The response reduction performance of the developed TMD under earthquake loading on actual piping was investigated. Results confirmed that, on average, seismic response reduction rates of 34% in the maximum acceleration response, 41% in the root mean square acceleration response, and 57% in the spectral acceleration response were shown through the TMD application. This developed TMD operated successfully within the seismic response reduction rate of existing TMD optimum design values. Therefore, the developed TMD and dynamic interpretation help improve the nuclear piping's seismic performance.