한국보건행정학회 창립 25주년 기념 학술대회 : 노인장기요양보험이 의료비 변화에 미친 영향 분석

이호용,김경아 한국보건행정학회 2013 한국보건행정학회 학술대회 논문집 Vol.2013 No.2

비평논문-근대 2 (1910~1945)

이호용 역사학회 2004 역사학보 Vol.0 No.183

BaTiO₃에서 2차 비정상 입성장

이호용,김재석,허태무,이종봉 선문대학교 1998 공과대학논문집 Vol.1 No.1

Ti-excess BaTiO_(3)를 1360℃와 1370℃ 사이 온도에서 열처리하였을 때, 비정상 입자들이 수 ㎜까지 성장하였다. 이러한 비정상 입자들은 1차 비정상 입성장이 끝난 후에 다시 나타나 이를 2차 비정상 입성장이라고 하였다. 대부분의 2차 비정상 입자들에서 수 십 ㎛ 두께의 (111) 쌍정이 관찰되며, 2차 비정상 입성장은 1360℃와 1370℃ 사이의 온도 범위에서만 일어났다. 이러한 2차 비정상 입성장을 Twin-Plane Re-entrant Edge (TPRE) 성장기구로 설명하였다. When undoped BaTiO_(3) powder of Ti-excess composition was sintered, some abnormal grains appeared and grew to several millimeters at temperatures between 1360℃ and 1370℃. Since it occurred after completion of the first abnormal grain growth, it is called the secondary abnormal grain growth (SAGG). Almost all secondary abnormal grains were observed to contain the (111) double twins of about several tens ㎛ spacing. The SAGG was observed to occur on]y at temperatures between 1360℃ and 1370℃. The SAGG was explained in terms of Twin-Plane Re-entrant Edge (TPRE) growth mechanism.

Undercut양에 따른 Clasp유지력의 비교연구

이호용,Lee, Ho-Yong 대한치과보철학회 1987 대한치과보철학회지 Vol.25 No.1

The purpose of this experimental study is to investigate the relationship between the retentive capacity of clasp and the different undercuts. The author measured the retentive power of Aker's clasp and I-bar clasp of chromium cobalt alloy and gold alloy, varying the undercut depth of 0.125mm, 0.25mm and 0.5mm, and then analyzed statistically. The results were followings. 1. The retentive capacity of chromium cobalt alloy clasps were almost twice as much of gold alloy in each undercut. 2. The retention power of I-bar clasp were higher than Aker's clasp in each undercuts. 3. Increasing the depth of undercut in 0.125mm, 0.25mm and 0.5mm, the clasps did not always exert the multiple amount of the retentive power.

치과 이식과 보철

이호용 대한치과의사학회 2001 대한치과의사학회지 Vol.20 No.1

Bacillus cereus의 세포막 조성에 미치는 계면 활성제의 영향

李豪容 尙志大學校 論文集 Vol.11 No.-

This study was designed to illucidate the effects of detergents on bacterial membrane. Bacillus cereus was cultured in the broth medium treated with six kinds of detergents(sodium dodecyl sulfate, sodium deoxycholate, palmitoylcarnitine, palmitoylcholine, Triton X-100 and saponin), and the changes of bacterial membrane were investigated. The chemical changes of bacterial membrane were determined by means of biochemical and radiological analysis. Population growth was decreased by detergents, except SAP. It means that Gram-negative bacteria was more resistant than gram-positive bacteria. As to the effect of detergent on biochemical composition of biomembrane, content of structural protein and phospholipid were decreased by treatment of SDS and P. chol. For the influence to lipid biosynthesis and Metabolism, lipids of bacteria were labelled by incubation of cells with C??-glucose as an energy source. It was found that membrane components, such as lipids and protein were solubilized by treatment detergents. It was concluded that systems of lipid biosynthesis and metabolism were influenced by detergents. The binding experiment was tried to see relationship between the growth and nutrient binding. Result showed that SAP increased cell growth and glucose binding but P. car decreased. Therefore, population growth was decreased as a result of direct solubilizing effect, showing decrease of binding effect and metabolic function.

가상현실을 이용한 압축 실험에 관한 연구

이호용,임중연,정지윤,Lee Ho-Yong,Lim Joong-Yeon,Jung Ji-Youn 한국공학교육학회 1999 공학교육연구 Vol.2 No.1

본 연구는 가상 현실(virtual reality)을 활용하여 실제 고가의 실험장비를 구입하지 않고도 개인용 컴퓨터에서 인터넷상으로 가상적인 프레스를 이용한 압축실험을 할 수 있도록 하는 것이다. 가상압축실험의 구현은 인터넷을 통하여 세 개의 모듈 즉 입력, 계산, 결과로 나누어 계산되어진다. 입력모듈에서는 압축실험을 위하여 인터넷 사용자가 재료의 실험적인 특징을 입력하고 그 입력 값을 서버 컴퓨터로 보내주는 과정이며, 계산모듈은 서버 컴퓨터에 있는 시뮬레이션 해석프로그램을 이용하여 입력모듈의 입력 값을 받아들여 결과를 계산한 후 파일로 저장하는 과정이다. 결과모듈에서는 서버 컴퓨터에서 계산된 결과를 인터넷 사용자에게 도표와 그림 그리고 3차원 애니메이션을 보여주는 과정으로 되어있다. 이를 구현하기 위하여 인터넷의 언어인 HTML, CGI, VRML, JAVA를 사용하였으며, 유한요소법(FEM)을 이용한 해석프로그램은 포트란(Fortran) 언어로 제작되었다. 현재 인터넷상에서의 가상현실을 이용한 응용분야가 급속히 확대되므로 앞으로 공학적인 가상 실험에 관한 연구가 많이 이루어져 실제 실험을 대체할 것이다. This paper is concerned with the compression test such as compression and ring compression tests, by using virtual reality. Engineering material laboratory can be carried out on personal computer without the real expensive experiment devices. The virtual laboratory is composed of three modules as input, calculation and output module on internet. Internet user can give the material's property and other parameters to the server computer at the input module. On the calculation module, simulator cimputes the results by analysis program and store the data as a file. The output module is the program that internet user can confirm a virtual compression results by showing a table, graph, and 3D animation. This program is designed by Internet language such as HTML, CGI, VRML, JAVA. And analysis program uses the finite element method with fortran language. Since the study of virtual reality on internet is rapidly increasing, the virtual experiment of technique will substitute many real experiments in the future.

Gram 음성 세균인 Serratia marcescens에 의한 카드뮴 흡착 기작

이호용,민봉희,최영길 한국생태학회 1999 Journal of Ecology and Environment Vol.22 No.1

Serratia marcescens, an enterobacterium of gram-negative bacteria, is characterized by resistance of the admium. Cadmium sensitive PM strain did not grow in the medium at cadmium concentration of 50 ppm. PA strain was induced to accommodate to cadmium by cultivating the mother strain (PC strain) in the medium with 50 ppm cadmium. As compared with PC and PM strains, PA strain revealed the excellent growth in cadmium media and accumulated four to five times higher cadmium concentration in cell than other strains. PA strain accumulated 23% of cadmium in cells when cultured in medium treated with 100 ppm cadmium and this cadmium was more accumulated in cytosol fractions than membrane fractions. Analysis by TEM indicated that cadmium was concentrated as a form of granule in cytosol. In protein patterns of cell after the treatment of cadmium, two inducible proteins (28 KDa and 64 KDa) and one reducible protein (45 KDa) were detected by SDS-PAGE. By Atomic Absorption Spectrophotometer, the amounts of cadmium attached to inducible proteins of 28 KDa and 64 KDa were 318.28 ㎍ and 325.37 ㎍ per gram of protein, respectively. It is assumed that these inducible proteins play an important role in the mechanism of cadmium accumulation in cells. A plasmid of 23Kbp was found in S. marcescens. The ability of resistance to cadmium in plasmid was confirmed by curing experiments. 중금속에 대한 내성을 나타낸 Serratia marcescens를 이용하여 카드뮴 흡착 기작에 관하여 조사하였다. 먼저 카드뮴에 대하여 민감성을 나타내는 돌연변이 균주인 PM을 개발하였으며 PM균주는 50ppm 이상의 카드뮴 농도에서 성장하지 못하였다. 카드뮴을 50ppm 처리한 균주에서 10회 이상 계대 배양하여 카드뮴에 적응을 유도한 PA균주는 PC, PM균주에 비해 성장 속도가 증가하였으며 세포 내 카드뮴 축적량도 4∼5배 증가하였다. PA균주는 100 ppm 카드뮴 처리군에서 처리량 중 23%를 세포내에 축적하였으며 세포막 부위보다 세포질 부위에 더욱 많은 카드뮴을 축적하였다. 카드뮴 처리시, 전 세포 단백질 양상에서 28 KDa과 64 KDa의 2개의 유도 단백질과 45 KDa의 감소 유도 단백질을 확인하였으며 원자 흡광 분석을 통하여 각각의 유도 단백질에 결합된 카드뮴 양은 단백질 1 g당 318.25 ㎍, 325.37 ㎍이 검출되었다. 세포내에 축적된 카드뮴을 전자현미경을 이용하여 카드뮴 결합 물질을 확인한 결과, 세포질의 단백질 분획에서 28 KDa크기의 유도 단백질이 카드뮴과 흡착한 것으로 나타났다. 카드뮴 흡착에 대한 DNA조사 결과 20 Kb 크기의 plasmid가 존재하였으며, curing agent로 plasmid를 제거한 결과 카드뮴 내성을 상실하여 본 분리 균주의 카드뮴 내성 유전자는 plasmid상에 위치하는 것으로 확인하였다.

쾌속 3차원 조형 시스템을 활용한 장신구 제작방법의 개발

이호용,임중연,김경아,범형택 東國大學校 1998 東國論叢 Vol.37 No.-

This paper is concerned with the new production method for jewelry by using rapid prototyping system. this system can directly produce the three-dimensional prototype shape of jewelry based on CAD modeling. Recently, rapid prototyping technology has been regarded as a powerful concurrent tool for integrating design and manufacturing process. In view of this, our study focuses the attention on the new application of this technology into the prototype production of jewelry which has been manufactured almost by hand. The characteristics of various RP systems are presented and one distinct jewelry example has been produced to show that out method is quick and efficient.

PbTiO$_3$첨가에 의한 BaTiO$_3$의 입계이동

이호용,김재석,강석중 한국세라믹학회 1999 한국세라믹학회지 Vol.36 No.4