광중합형 구치부 수복재료의 중합수축량과 중합수축력

박성호,이순영,조용식,김수선,이창재,김영주,이봉희,이광성,노병덕 大韓齒科保存學會 2003 Restorative Dentistry & Endodontics Vol.28 No.4

The purpose of present study was to evaluate the polymerization shrinkage stress and amount of linear shrinkage of composites and compomers for posterior restoration. For this purpose, linear polymerization shrinkage and polymerization stress were measured. For linear polymerization shrinkage and polymerization stress measurement, custom made Linometer (R&B, Daejon, Korea) and Stress measuring machine was used (R&B, Daejon, Korea). Compositers and compomers were evaluated; Dyract AP (Dentsply Detrey, Gumbh, German) Z100 (3M Dental Products, St. Paul, USA) Pyramid (Bisco, Schaumburg, USA) Synergy Compact (Coltene, Altstatten, Switzerland), Heliomolar (Vivadent/Ivoclar, Liechtenstein), and Compoglass (Vivadent Ivoclar/Liechtenstein) were used. 15 measurements were made for each material. Linear polymerization shrinkage or polymerization stress for each material was compared with one way ANOVA with Tukey at 95% levels of confidence. For linear shrinkage ; Heliomolar, Surefil<Synergy Compact, Z100<Dyract AP<Pyramid, Compoglass F (p<0.05) For Shrinkage stress ; Heliomolar < Z100, Pyramid<Synergy Compact, Compoglass F<Dyract AP<Heliomolar HB, Surefil (p<0.05)

Sc₂O₃를 첨가한 SnO₂/Ca,Pt 가스센서의 부탄감응 특성

이윤수,성정훈,강봉휘,서무교,이덕동 경북대학교 센서기술연구소 1997 센서技術學術大會論文集 Vol.8 No.1

A coprecipitation method was used for preparing Ca and Pt doped SnO_(2) powder. Components were investigated by XRD and SEM. Sc_(2)O_(3) added SnO_(2) /Ca,Pt thick film devices were fabricated by screen printing technique for butane gas detecting. By addition of Sc_(2)O_(3), the selectivity of SnO_(2) /Ca,Pt thick film for butane gas was enhanced. The sensitivity of Sc_(2)O_(3) added SnO_(2) /Ca,Pt device to 3,000 ppm butane in air was about 90% at the operating temperature. of 200℃. And the device showed good selectivity for butane gas.

동의보감의 활석에 대한 지질학 및 한의약학적 고찰

이재영,서부일,황덕환,이인호,임용수 慶北大學校 師範大學 科學敎育硏究所 1999 科學敎育硏究誌 Vol.23 No.-

Talc has been used as mineral drugs in the oriental medicine to cure catharsis, dysentery, dry breast, poor micturition, chronic indigestion, etc. according to the 'Donguebogam' which had been published by Heo Jun in 1613. In the book there is a description of 'talc from Chungju is of good quality'. To investigate the description geologically and oriental medically, talc from Dongyang Talc Mine in the Chungju area was analysed and compared with that of Oriental Medical Hospital of Kyungsan University, which has MgO 31.65%, CaO 0.73%, SiO_(2) 60.04%, ignition loss 6.4% close to those of pure talc containing MgO 31.7%, SiO_(2) 63.5%, H_(2)O 4.8%. However, talc from Dongyang Mine with MgO 31.8%, CaO 0.51% and SiO_(2) 61.0% is closer to pure talc and contains less impurities (Fe_(2)O_(3) 0.8%). Ca and Fe may add medical effects to talc drug as in the case of actinolite. Formula (3) logα_(Mg)^(2+) = 11.89 - 2pH and (4) logα_(Mg^(2+)/α^(2)_(H)^(+)) = 6.6 - 1.33 logα_(H4SiO4) may be used as basic data to predict and examine soluble contents of talc drug for medical experiments.

疎水性 中空絲膜을 이용한 Cu(II)의 透過抽出

李龍珍,金萬壽,朴東源,金英一,黃德基 東亞大學校 大學院 1997 大學院論文集 Vol.22 No.-

Liquid-liquid extractions by use of microporous hollow fiber modules are fast compared with conventional extraction equipment because of the large surface area per volume. In these modules, the extractant and feed can be contacted at high speed andtwo flows are completely independent, so there are no problems with loading and channeling. In this paper, it was investigated the extractability for liquid-liquid extraction of Cu(Ⅱ) from dilute aqueous solution into D2EHPA(di-2-ethylhexylphosphoric acid), TBP(tri-n-butyphosphate) and TOA(tri-n-octylamine) as organic extractants by using the hydrophobic hollow fiber module. To determine the dependence of mass transfer rate on distribution of Cu(Ⅱ) in the module, we compared the overall mass transfer coefficient with distribution ratio. From these experiments, we identified the effect of distribution ratio on the overall mass transfer coefficient was, for the low H, the K? was increased with increasing H, but high value of H, the effect of H on K? could be negligible.

실관형 막모듈에 의한 Hg(Ⅱ)의 분리에 관한 연구

이용진,김만수,황덕기,박동원 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1

By use of hollow fiber membrane module, this study examines the value of H(distribution ratio) and Kw(overall mass transfer coefficient) on the Hg(Ⅱ), and used di-2-ethylhexylphospric acid(DZEHPA), tributyl phosphate(TBP), tri-n-octylamine(TOA) as extractant, Also, shown the change of changing the acid. From these experiments and discussions, we have the results as follows. 1. In case of Hg(Ⅱ), the order of well seperated is TOA, DZEHPA, TBP. 2. Concentration decrease ratio have the straight lines for the changing of the time in each systems. So, It was know that the result coincide with theory. 3. The effect of Kw vs. H were shown that in case of H is lower than 10, H is high effect. But H is higher than 10, H is low effect.

농작물 해충 및 진균류 방제를 위한 방선균의 분리 및 동정

이은정,강경돈,황교열,김두호,김신덕,성수일 한국잠사학회 1998 한국잠사곤충학회지 Vol.40 No.1

Twenty seven out of ca. 5,000 actinomycete strains, which were isolated from soil collected throughout the country, showed antimicrobial effects against fungi, Rhizopus stronifer (ATCC6227a), Rhizoctonia solani (KCCM 11271) and yeast, Candida albicans(ATCC10231). From these antifungal microorganisms, we further selected seven strains which seemed to produce insecticidal substances with in vivo test, using silkworm, Bombyx mori and beet armyworm, Spodoptera exigua. Morphological and biochemical experiments revealed that three strains out of seven were streptomyces. Further investigations on the physical and chemical properties of these antifungal and insecticidal substances are now in progress.

코일과 클립을 선택적으로 적용해서 성공적으로 치료했던 다발성뇌동맥류 1례 : A case report

이덕구,김범태,황선철,임수빈,이세영,신원한 순천향의학연구소;Soonchunhyang Medical Research Institute 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

The author report a case of multiple cerebral aneurysm successfully treated with an appropricate selection of surgical clipping and coil embolization. A 64 years old female patient was admitted with stuporous consciousness. Initial 3D CT angiography showed diffuse subrarachnoid hemorrhage on the basal cisterns, saccular aneurysms on the terminal basilar artery and right middle cerebral artery(MCA). Converntional angiography confirmed the ruptured aneurysm was basilar one. Coil embolization was perfromed on the basilar aneurysm with 6 Guglielmi detachable coils(GDC) on the 3 days after ictus. Sugical clipping was done on the unruptured right MCA aneurysm on 10 days after ictus without any morbidity. Each treatment modalities can be appropriate indicated for the coiling or clipping aneurysms.

젊은 성인에서 흡연에 의한 상완동맥 내피기능의 부전에 관한 연구

이상철,권영주,방덕원,이선해,이보영,김지욱,김영훈,온영근,현민수,김성구 순천향의학연구소 2002 Journal of Soonchunhyang Medical Science Vol.8 No.1

Background and Objectives : Cigarette smoking is a major factor and the most modifiable risk factor for atherosclerosis. Endothelial dysfunction is an early event in atherosclerosis, before the structural change of the systemic arteries. We hypothesized that endothelial dysfunction might be present in the systemic arteries of young adult smokers and that this might be dose-dependent phenomenon. Therefore, we try to certify that smoking is associated with endothelial dysfunction in healthy young adults without other risk factor of atherosclerosis. Subjects and Methods : we studied noninvasively 29 subjects aged 3 to 4 decades without other risk factor of atherosclerosis, they were composed of the two groups, current smokers(n=15) and nonsmokers(n=14). Smoking history varied from 3 to 20 pack years. Using high-resolution ultrasound, vessel diameter and mean flow rate were measured at rest, during reactive hyperemia(with flow-mediated endothelium-dependent dilation), and after sublingual nitroglycerin(NG-induced endothelium-independent vasodilation). Result : Flow mediated endothelium dependent dilation was observed in the control subjects (9.4±3.44%) but was impaired in the smokers(5.8±2.51%)(p=0.004). NG-induced endothelium independent dilation is no difference in all subjects. Conclusion : Cigarette smoking is associated with endothelial dysfunction in healthy young adults.

建築專門知識의 二重的 屬性과 프로페션化와의 葛藤

김덕수,이공희 대한건축학회 2004 대한건축학회논문집 Vol.20 No.7

Architecture, as a profession, is a specialized knowledge-based occupation. Professionalization is considered as a process wherein an organized occupation negotiates the right to perform certain types of work and to have a controlling influence in training for and, hence, entry into the occupation and in determining the evaluation the way in which work is performed. The path for professionalization of architecture has been shaped by the types of knowledge and the contingent skills claimed by architects. In executing occupational control, the professional power of architecture is related to technicality(i.e., the transferable component by standardization and routinization) and indeterminacy(i.e., the non-transferable component such as artistic mastery and new knowledge generation) elements of professional knowledge. Generally, the indeterminacy/technicality ratio is relatively high in professional knowledge. In healthcare architectural firms, however, the reversed ratio is found. The reversed ratio is one of the major issues associated with the decreased professional autonomy of architects. This study, within healthcare design context, concludes that highly specialized firms enjoy their firm growth. This is a consequence of their high credibility and reliability regarding their work performance due mainly to their specialized knowledge. Firm size and age are not related to the degree of professional autonomy. Rather, architects have experienced the loss of it due to the decreased competence gap between architects and clients/users. It is recommended to increase the number of indeterminacy elements of professional knowledge for the professional development of architecture.

석회암 지역의 기반암 및 경계면 조사를 위한 지구물리 탐사법의 적용

서백수,이덕재 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.A

In 1970's, the analysis of shallow substructure was the interests of geological engineering and environmental problems. And seismic refraction method was applied to detect those structures. From 1980's, digital electric industry is rapidly developed and high resolution prospecting equipment is supplied. And seismic reflection method is applied to achieve various data gathering and analysis. In this study, geophysical prospecting method is applied to calculate the basic data of limestone yield production. Seismic shallow reflection method is used to detect the depth of bedrock and electrical resistivity method is used to detect of limestone layer boundary.