신규 3작용성 메타크릴레이트의 치과용 광중합형 콤포짓트 레진용 단량체로서의 응용 연구

김중곤,정찬문,김민성,김광만,김경남 大韓齒科器材學會 2001 대한치과재료학회지 Vol.28 No.4

Tris[4-(2-hydroxy-3-methacryloxypropoxy)phenyl]methane(THMPM) was prepared easily from triphenylolmethane triglycidyl ether in good yield. As compared with composite resin formulated with difunctional bis-GMA, the physical properties of a newly developed composite resin formulated with trifunctional THMPM was evaluated. Cytotoxicity and acute toxicity of composite resin based on trifunctional THMPM evaluated according to ISO standard method. The depth of cure of the composite resin based THMPM was higher than that of the bis-GMA composite. There were no significant differences in flexural strength and water sorption between the composites resin based on THMPM and bis-GMA. The water-solubility value for the light-activated composite resins formulated with THMPM was much lower than that for a control bis-GMA composite. According to cytotoxicity evaluation, the composite resin based on THMPM showed very mild cytotoxicity with the response index of between 0/0 and 1/0. No acute toxicity of composite resin formulated with trifunctional THMPM was also observed. It is believed that THMPM is promising candidate for application as a photocurable dental composite resin.

선인장 양심실 보조장치의 설계 및 임상적용을 위한 평가

민병구,박찬영,최재순,이혁수,황창모,김삼성,윤걸중,김종원,선경,이경갑,정종태,김원곤 제주대학교 인공심장이식연구소 2001 인공심장 연구 Vol.2 No.1

현재 개발되고 있는 맥동형 이식형 인공심장은 완전이식형 인공심장과 좌심실보조장치 뿐이다. 좌심실보조장치를 장착한 환자의 10~15%가 우심실의 보조를 필요로하고 완전이식형 인공심장의 장착을 위해서는 자연심장을 제거해야하는 상황에서 이식형 양심실보조장치에 대한 필요성이 대두되고 있다. 본 연구진은 완전이식형 인공심장으로 개발된 한국형 인공심장을 개선하여 양심 실 보조장치를 개발하였다. 양심실보조장치는 이동형 작동기식 미케니즘을 이용하고 있으며 에너지 변환장치와 감속기로 구성된 작동기와 혈액주머니, 그리고 내장형 제어기로 구성되어 있다. 선인장 펌프로 명명된 KAH350은 캐뉼라의 연결을 위한 커넥터를 포함하여 길이 177mm, 폭 164mm, 높이 67 이고 무게 780g이며 최대 심박출량은 5L/min 이다. 양심실보조장치로 개발된 선인장펌프는 좌심실보조장치로도 응용이 가능하다. 이식적합성과 생체적합성을 평가하기 위하여 좌심실보조장치로 5회, 양싱실보조장치로 6회의 동물실험을 수행하였다. 각각 최장 28일간 생존하였으며 11회의 동물실험중 장치의 결함에 의한 것이 3회 있었는데 이들은 모두 전자장치의 결함과 방수처리문제였다. 현재 이식적합성과 일박출량을 향상시킨 KAH400모델이 개발중이다. The types of pulsatile implantable artificial hearts that are on the way of development and have been developed are totally implantable artificial heart and implantable left ventricular assist device (LVAD). Approximately 10% to 15% of all patients Implanted with wearable VADs have required right heart support with another device. And it is reluctant to patient who should remove his or her own heart to be implanted with total artificial heart. These situations drive the development of implantable bi-ventricular assist device (BVAD). The Korean BVAD was develophed by modifying the moving actuator type Korean artificial heart. This electro-mechanical BVAD comprises actuator including energy converter and reduction gear train, blood sacs, and internal motor and energy controllers. The KAH350 which is named as 'Cactus Pump' is 177mm in length, 164mm in width, and 67mm in thickness including connectors and nuts. The weight and maximum cardiac output of Cactus Pump is 780g and 5L/min, respectively. The Cactus Pump that was developed as BVAD could be used as LVAD by attaching compliance caps on the 2 ports of one ventricle. The animal experiments were undergone 5 times for LVAD, and 6 times for BVAD. The best records were 28 days survival in both applications. There were 3 times of device failure and they were all associated with electrical connection and hermetic sealing. The KAH400 that has improved anatomical fitting characterisitcs and stroke volume is on development.

경희대학교 수원캠퍼스의 멀티미디어관 주변 공원계획

김동찬,김성준,박중구,황세현 경희대학교 부설 디자인연구원 1999 예술· 디자인학연구 Vol.2 No.1

Multimedia center at Kyung-Hee University is going to be opened in 1999. The purpose of this study is to extend the usability of outdoor space around the multimedia center. This study, therefore, presents the space, which gives a resting area, provide a beautiful sight, improve the accessibility of path, and give a theme.

張介賓의 醫學 思想과 理論批判에 對한 硏究

姜重漢,朴?國 慶熙大學校韓醫科大學韓醫學硏究所 1986 慶熙韓醫大論文集 Vol.9 No.-

유니사이클 로봇에 대한 인간적 추론 제어 메카니즘

김중완,안찬우,전태옥,전언찬,정희균 동아대학교 공과대학부설 생산기술연구소 1996 生産技術硏究所硏究論文集 Vol.1 No.2

Our unicycle has simple mechanical structure.But unicycle's dynamical system is a very sensitive unstable nonlinear system. equations of motion for a simple unicycle robot were derived using Lagrage's method. In this paper, a human fuzzy influence control mechanism was established throught an inquiry into human riding a unicycle, and we developed a hybrid controller to control our unicycle robot. This proposed hybrid controller is consisted with a pure PD and two fuzzy gain scheduled controllers and a direct fuzzy logic controller. Computer simulation results show that our hybrid controller has robust control performnance to unstable nnonlinear unicycle robot system.

경희대학교 수원 캠퍼스의 교문디자인 연구

김동찬,이윤수,박중구,황세현,김명기 경희대학교 디자인연구원 2000 예술· 디자인학연구 Vol.3 No.1

The Suwon Campus of Kyunghee University was decided to rebuild a university gate to make new image of the university for a new millenium. The purpose of this study is to design a university gate not only for a gate but also for a commemorative environmental model which presents a spirit and idea of the Kyunghee University. The entire design of the gate has a renaissance style, the design of it's center has a triumphal arch form which cars can go through, and the design of it's side has a corridor form which pedestrians can walk. The gate is designed to present the spirit for human and world peace which Kyunghee University intends.

일부 의료이용자의 민간의료보험에 대한 태도와 정책적 시사점

이찬희,김원중 인제대학교 2007 仁濟論叢 Vol.22 No.1

The main objective of this study is to examine the attitudes of some medical consumers to private health insurance so that the results can be utilized in establishing the government's health insurance policy and hospitals' management strategies. Based on this objective, an interview survey was conducted through structured questionnaire for the patients of four general hospitals located in Busan Metropolitan City during the period of 3/1-4/30/2005, and data from 520 patients were utilized in the final analysis. Survey items included general characteristics of the patients(sex, age, education, income, etc.), various factors related to patients' satisfaction on National Health Insurance and supplementary private health insurance, and their opinions on the introduction of substitute private health insurance. SPSS(version 12.0) was used to process the data. Major findings are as follows: 1) Overall satisfaction of the patients on National Health Insurance(NHI) was generally low, as 43.6% of the respondents were 'unsatisfied,' whereas only 7.0% 'satisfied.'(The remainder was 'neutral.') Main reason for the dissatisfaction was found to be 'insufficient benefits.' 2) 75.6% of the respondents possessed some kind of supplementary private health insurance policies, and their satisfaction level was relatively higher than that of NHI 3) 69.9% replied that the government should allow substitute private health insurance, and, when allowed, 62.2% would purchase such insurance policies. 4) However, based on economic abilities and attitudes to high-grade medical services, only 10-20% could be considered to have 'actual' or 'effective' demand for substitute private health insurance. 5) Logistic regression analysis suggested that the probability of purchasing substitute private health insurance policies was higher when the respondents were younger, richer and more dissatisfied with NHI.

적외선 흡수 분광법 및 DPC를 이용한 치과용 수복재의 광중합 거동 분석

정찬문,김중곤,최준호,장두옥,김경남,김광만 대한치과기재학회 1998 대한치과재료학회지 Vol.25 No.1

Mechanical properties of compomers would be obtained mainly by photopolymerization by visible light irradiation. Photopolymerization behavior of two commercial compomers was investigated by FT-IR spectral analysis and differential photocalorimetry(DPC). The results obtained were as follows: 1. From FT-IR analysis, it was found that the compomer products were photocured mainly by radical polymerizations of multifunctional methacrylate monomers. Final conversion values of the polymerizations after exposure to visible light for 60 sec were 67% for Dyract and 59% for Compoglass. 2. Upon exposure the compomers exhibited autoacceleration and autodeceleration, which are usually observed in bulk polymerizations of multifunctional monomers. 3. Dyract showed higher rate of polymerization and conversion of double bond than Compoglass.

발생원별에 따른 PAHs 배출특성

박찬구,윤중섭,김민영,손종열,모세영 한국대기환경학회 2004 한국대기환경학회지 Vol.20 No.3

The results of individual PAH source profiles that can be applied to receptor model are as follows. The sum of 16 PAH concentrations was 391.41 ng/S㎥ in a tunnel. Phenanthrene was the most abundant compound among 16 PAH, and then pyrene, fIuoranthene, anthracene, and naphthalene can be seen in elevated contents. 11,056.61 ng/S㎥ of 16 PAH concentrations in BC oil boiler was two times higher than 6,582.57 ng/S㎥ of those in LNG boiler. Naphthalene was the most abundant compound in both facilities. Phenanthrene, anthracene. and acenaphthylene were the second dominant compound group in order from both facilities. BC oil boiler had relatively high concentration of pyrene compared to LNG boiler that had high concentration of fluorene and did not detect pyrene. The sum of 16 PAH concentrations emitted from MSW incinerators after APCD (air pollution control device) was three times higher than those from MSW incinerators bcfore APCD. However, the concentrations of more than 4-ring PAH compounds (e.g., benzo (a)anthracene) before APCD were higher than those after APCD. This fact implies that PAHs generated by combustion process are eliminated in APCD and they are continuously produced in stack or atmosphere by PAHs precursors.

솔잎혹파리 피해 소나무재의 해부 및 물리학적 특성

황원중,권구중,이찬용,김남훈 강원대학교 삼림과학연구소 2001 Journal of Forest Science Vol.17 No.-

솔잎혹파리 피해 소나무재의 특성을 이해하고 효율적인 이용방법을 모색하기 위한 기초자료를 얻기위하여 솔잎흑파리 피해재의 해부 및 물리학적 성질을 조사하여 정상재와 비교 및 검토하였다. 그 결과, 솔잎혹파리 피해재는 정상재에 비해 축방향 수지구 및 수평수지구의 수가 많았고 위연륜이 출현하는 특징을 나타냈다. 또한 솔잎흑파리 피해재가 정상재보다 변 · 심재 모두 수축 · 팽윤율이 높았으며 변재부의 생재함수율은 정상재에 비해 다소 낮았다. 압축강도와 휨강도는 정상재보다 다소 낮았으나 전단강도는 거의 비슷한 값을 보여주었다. The objective of this work is to examine anatomical and physical characteristics of wood damaged by pine needle gall midge(PNGM, Thecodiplosis japonensis Uchida et Inouye) in Pinus densiflora. In anatomical characteristics, it was noted that the number of axial and radial resin canals in the damaged wood was higher than that in sound wood. In damaged wood, green moisture content of sapwood and swelling and shrinkage was higher than sound wood Both longitudinal compressive strength and bending strength of the damaged wood were lower than those of sound wood. On the other hand, shearing strength of damaged wood was similar to that of sound wood.Key word : Pinus densiflora, Thecodiplosis japonensis Uchida et Inouye, annual ring width, resin canal