건축물의 LCC Database 구축에 관한 연구

전찬민,우경헌,김중현,김경업,박태근 목원대학교 건축도시연구센터 2003 建築·都市環境硏究 Vol.11 No.-

The importance of LCC analysis has been enlarged. Also, it would be necessary to computerize LCC analysis for accurate and logical analysis of LCC. In other papers, they showed LCC analysis model but the study of database development which could be applied in LCC analysis have been undeveloped. This study showing the development of common database for the LCC analysis computerization inquires into cost breakdown structure by previous researches. Also, it makes cost breakdown structure for deriving LCC cost item. As a result, the standard of LCC analysis computerization by developing LCC DB of cost breakdown structure would be shown.

삼차신경 척수감각핵 박편에서 신경세포의 활성도에 미치는 아미노산 신경전달물질의 영향

윤찬송,김중수,이종흔 대한구강생물학회 1992 International Journal of Oral Biology Vol.16 No.1

This study was performed to elucidate the effects of excitatory amino acid(EAA) on medullary dorsal horn neurons in vitro and the interelations between EAA and substance P in medullary dorsal horn. Horizontal slices of caudal part of trigeminal sensory nucleus(500-600 ㎛ thick) were prepared from rats about 5 weeks old, then transferred and fixed in the recording chamber where it was preincubated and continuously perfused with aerated modified Krebs-Ringer solution. Intracellular recordings were carried out with glass microelectrode to record the changes of membrane potential and membrane input resistance induced by glutamate, aspartate and substance P perfusion. Glutamate and aspartate respectively depolarized medullary dorsal horn neurons and decreased membrane input resistance in a dose-dependent menner. Effect of glutamate and aspartate applied simultaneously on medullary dorsal horn neuron was not different from that of glutamate or aspartate, respectively. Substance P also depolarized medullary dorsal horn neurons and decreased membrane input resistance. Medullary dorsal horn neurons responding to glutamate also responded to aspartate and substance P.

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.

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.

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

우수 사과酒酵母의 分離와 利用에 關한 硏究

朴允仲,金燦祚,李錫健,吳萬鎭,孫天培 충남대학교 농업과학연구소 1978 農業技術硏究報告 Vol.5 No.1

Extensive selection works on wild yeasts of fruits were carried cut to obtain strains which are applicable to apple wine making. Among the total number of 1,358 yeast strains which were isolated from various fruit samples collected from the vicinity of Daejeon and other regions of Korea, the strains SH-49, SH-129 and SH-338 were found to be useful. Then experiments on their morphological and physiological characteristics, and on the aspects of practical use in apple wine making were proceeded. The results obtained were as follows: 1. The strains SH-49 and SH-129, particularly SH-49, were appeared to have good fermentation ability, tolerance to sulfur dioxide and to produce fine quality of apple wine. 2. Apple wines made by using the strain, SH-49 and SH-129 contained less amount of total acids than those by other strains. 3. Apple wines of SH-49 and SH-129 were clarified rapidly during the primary fermentation period, and their absorbancy at 430 nm after 45 days of storage were approximately half of others. 4. Apple wine of SH-338 contained higher amount of residual sugar and its quality was superior to others. It is considered that this strain could be used in the production of apple wine of a characteristic quality. 5. The strains SH-49 and SH-338 were identified as a Saccharomyces cerevisiae according to Taxanomic Study of Yeasts by Lodder, however, classification of SH-129 was suspended for further study.

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.

치과용 디지털 색상 분석용 기기의 정확성과 재현 능력에 대한 평가

정중재,박수정,조현구,황윤찬,오원만,황인남 大韓齒科保存學會 2008 Restorative Dentistry & Endodontics Vol.33 No.4

본 연구에서는 치과용 디지털 색상 분석기기 중 하나인 ShadeScan (CYNOVAD, Montreal, Canada)의 색상 분석의 정확성과 재현 능력을 평가하였다. 균일한 치아 배열을 가진 20대 성인 남자 8명과 여자 8명의 상악 인상을 고무인 상제 (Exaflex, GC, Japan)를 이용하여 채득하고, 인상에 A2 색상의 임시 크라운 제작용 자가중합형 레진을 주입하여 치아 모델을 완성하고, ShadeScan을 이용해 각 치아의 영상을 얻어 컴퓨터의 ShadeScan 프로그램으로 분석하였다. 그리고 측정 결과의 재현 능력를 평가하기 위해 2개의 치아 모델을 임의로 선택하여 각 치아마다 10회의 색상 측정을 시행하여 분석 결과를 비교하였다. 또한 분석된 영상의 동일 shade 간의 색차를 확인하기 위해 광중합 복합레진인 Gradia Direct (GC, Tokyo, Japan)와 shade guide의 CIE L^(*)a^(*)b^(*) 값을 백색과 흑색 배경판 상에서 spectrophotometer (Spectrolino, GretagMacbeth, USA)로 측정하고, ShadeScan에 의해 동일한 shade로 분석된 shade guide간의 색차를 계산하여 다음의 결과를 얻었다. 모든 치아에서 모델 제작 재료와 동일한 A2 색상므로 분석된 경우는 없었으며, 개개의 치아에서 전체 순면이 동일한 색상으로 분석된 예는 없었다. 또한 동일한 치아군에서 치아의 크기 , 형태 , 순면의 굴곡 등에 따라 서로 다른 색상 분포를 보였다. 재현성 평가에서 각 치아의 중앙부는 비교적 일정한 재현성출 보였으나, 절단부와 주변 부위는 재현성이 낮았으며, 동일한 shade로 분석된 shade guide 간에는 3 이상의 색차 (ΔE^(*))를 보였다. 이상의 결과는 치과용 디지털 색상 분석기기는 비록 높은 재현 능력은 가지고 있지만 정확성에 오류가 있음을 시사하며 , 따라서 이러한 기기를 이용한 색상 분석 시 좀 더 세밀한 주의와 다른 방법의 추가 사용이 필요하리라 사료된다. This study was done to evaluate the reliability of the digital color analysis system (ShadeScan, CYNOVAD, Montreal, Canada) for dentistry. Sixteen tooth models were made by injecting the A2 shade chemical cured resin for temporary crown into the impression acquired from 16 adults. Surfaces of the model teeth were polished with resin polishing cloth. The window of the ShadeScan handpiece was placed on the labial surface of tooth and tooth images were captured, and each tooth shade was analyzed with the ShadeScan software. Captured images were selected in groups, and compared one another. Two models were selected to evaluate repeatability of ShadeScan, and shade analysis was performed 10 times for each tooth. And, to ascertain the color difference of same shade code analyzed by ShadeScan, CIE L^(*)a^(*)b^(*)values of shade guide of Gradia Direct (GC, Tokyo, Japan) were measured on the white and black background using the Spectrolino (GretagMacbeth, USA), and Shade map of each shade guide was captured using the ShadeScan. There were no teeth that were analyzed as A2 shade and unique shade. And shade mapping analyses of the same tooth revealed similar shade and distribution except incisal third. Color difference (ΔE^(*)) among the Shade map which analyzed as same shade by ShadeScan were above 3. Within the limits of this study, digital color analysis instrument for dentistry has relatively high repeatability, but has controversial in accuracy.

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.

자동 형상제어용 측정롤의 특성에 관한 연구

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

The continuing demand for quality products requires better understanding and improved control of the production process. And, in recent year requirements for flatness control in strip rolling have become increasingly severe because of the control for flatness of cold rolled strip is essential for further down stream processing. Also a speeds of rolling mills to meet productivity requirements puts a demanding requirement on the control of flatness of rolled strip. The demands on a total flatness control system therefore are a measuring and indication system consisting of a measuring roll that is robust, accurate, reliable and require a minimum of maintenance. The critical part of any control system is the quality of the information being provided by measurement instrument or device. It is therefore of utmost importance to have an accurate, repeatable measuring system.