불소처리된 치근상아질에 대한 심미수복재의 결합에 관한 연구

탁흥수,박상진,민병순,최호영,최기운 大韓齒科保存學會 1998 Restorative Dentistry & Endodontics Vol.23 No.1

The purpose of this study was to evaluate the effects of fluoride application on the aspect of shear bond strength of three aesthetic restorative materials to dentin. One light-cured composite resin(Palfique Esterite) and two light-cured glass ionomer cements(Fuji Ⅱ LC and Compoglass) were used in this study. 120 permanent molars were used for this study. The teeth were extracted due to the origin of periodontal disease. The crowns of all teeth were removed, and the remaining roots were embedded in epoxy resin. The mesial or distal surfaces of roots were ground flat to expose dentin and polished on wet 320-, 400-, and 600 grit SIC papers for a total of 120 prepared flat root dentin surfaces. The prepared samples were divided into six groups. Group 1, 3, and 5 were control groups and group 2, 4, and 6 were experimental groups. Sixty samples for experimental groups were treated with 2% NaF solution for 5 minutes. Group 1 and 2 were bonded with Plafique Esterite, group 3 and 4 were bonded with Fuji ll L(and group 5 and 6 were bonded with Compoglass. After 24 hours water storage at 37±1℃, all samples were subjected to a shear to fracture with Instron universal testing machine(No.4467) at 1.0㎜/min displacement rate. Dentin surfaces treated with each conditioners before bonding and interfacial layers between dentin and aesthetic restorative materials were observed under Scanning Electron Microscope(Hitachi S-2300) at 20Kvp. The data were evaluated statistically at the 95% confidence level with ANOVA test. The result were as follows; 1. Among the control groups, group 1 showed strongest bond strength and group 3 showed weakest. 2. Among the experimental groups, group 2 showed strongest bond strength and group 6 showed weakest. 3. Statistical analysis of the data showed that pretreatment of dentin with 2% NaF solution significantly decreased the bond strength of three aesthetic restorative materials to dentin(P<0.05). 4. SEM findings of fluoride treated dentin surfaces(2, 4, 6 group) demonstrated dentin surfaces covered with fluoridated reaction products. 5. Except group 4 and 6, resin tags were formed in all groups.

싸니어(撤泥語)에 대하여

延昊鐸 관동대학교 1997 關大論文集 Vol.25 No.1

This paper is to investigate some important characteristics of the Sani language (which generally considered to belong to Yi or Lolo language family in China), and give an overall view of the language to those who are interested in the studies of ethnic minorities. To do this, the present writer visited Kunming and its adjoining town of Beitachun, Luonan Prefecture, Yunnan Province, China quite several times during the period of from Dec., '94 until Feb,. '96, surveying and picking up the necessary information and materials of the Sani language. Throughout the field study, the informants and I agreed that Sani people and Koreans have much in common both in language and folk customs. It has been observed that the Sani language shows similarities to Korean language in connection with the language structure, specifically with its word order. One of the major characteristics of the Sani language lies in the use of particles. Upon the basis of the linguistic data, collected from the logn-term interaction with the Sani people, but mosly limited to the everyday expressions, we try to find out the common features of the both languages. We hope that the methods and analyses given here will be conducive to the comparative study of any two seemingly co-related languages. We believe that the Swadesh Chart presented as an appendix will give an insight into the Sani language.

ATM/B-ISDN 통신망 기반의 원격의료정보시스템을 위한 멀티미디어 데이터베이스 원격접속기능 설계 및 구현

김호철,김영탁 嶺南大學校 工業技術硏究所 1998 工業技術硏究所論文集 Vol.26 No.1

An investigation about Database Management System, Database Server and Data Communication Network is the first recomendation to implement the Tele-medical System that is offer a advanced medical service with share of patient information between hospital and manage of medical data. When we design a distributed database like Tele-medical System the data communication network is the most important thing from them. Cause, medical data is composed with large scaled mixed media data like text, image, audio, video and need a high-speed data communication network for remote access on theses data. In this paper, we implement a Agent for remote medical database remote access function of the Tele-medical System based on ATM and explain the result of performance analysis.

라후어(拉枯語), 아카어와 우리말의 助詞 比較硏究

延昊鐸 관동대학교 1995 關大論文集 Vol.23 No.2

The purpose of this study is to investigate the particles of the Lahu, Akha, and Korean languages, and to find out if there is a consanguinity or at least kinship relation among them. For several years(1992.1-1995.2) I have visited the northern pars of the Kingdom of Thailand, and tried to make contacts with the hilltribe peoples living in the high mountains, especially of Chiang Mai and Chiang Rai Provinces. Finally I have obtained the linguistic data necessary for the comparative analysis of grammatical relations of the three languages and the distributions, mon specifically, varieties and functions of the particles of Lahu end Akha languages. Among the major characteristics of the two hilltribe languages which correspond to those of the Korean language are SOV word order, the existence of particles, various sentence endings, verbal and adjectival inflections, and adjectival predicates. The Particle Chart and The Swardesh Chart will show the relationship among the languages concerned. Through the facts examined, it might be argued that the Lahu language is most closely connected with Korean, and Akha is a next kin, among all the languages in the world.

젤여과법을 이용한 토끼 심근 미오신의 분리 및 부분정제

정성탁,김대중,김호덕,라봉진 중앙대학교 의과대학 의과학연구소 1992 中央醫大誌 Vol.17 No.2

Myosin, the major protein required for the production of force and shortening in muscle, is a hexamer consisting two heavy chains (molecular mass∼200kDa) and pairs of light chains (molecular mass∼16 and 20kDa). Myosin and other contractile apparates from the left ventricular myocardium of rabbit were extracted using pyrophospate buffer system and was purified by using the gel filtration. And partially purified each protein component was confirmed by the electrophoresis in non-dissociation and dissociating conditions respectively. On Disc-PAGE of the crude extract, 4 bands clearly appeared and 3 protein components were separated by chromatography in the 5 fractions. In dissociating electrophoresis, each bands were separated into subunit in the pyrophosphate buffer. The first fraction contained the heavy chain of myosin, tropomyosin and myosin light chain 1 and 2. The second and third fraction were composed of tropomyosin and actin and the proteins that had molecular mass smaller than 15kDa were in the fourth and fifith fractions.

Furfuryl Chloride와 치환 피리딘류의 반응에 관한 속도론적 연구

강호숙,황규탁 대구대학교 부설 과학교육연구소 1993 과학교육 Vol.6 No.-

The rates and the activation parameters for the reaction of furfuryl chloride with substitude pyridines have been measured in protic solvent(methanol) and aprotic solvents(DMF) at 40℃, 50℃, and 60℃. The rates of reaction were increased with the electron donating power of substitutents and have larger values in aprotic solvent than in protic solvent. The isokinetic relationships were seen between activation energy and activation entropy except for 4-amino pyridine in methanol and DMF. The excellent linear relationships given by the equation (3), (4) were observed between logk and pka of pyridines. The Hammett plot showed a good linearity about substituted pyridine except for 4-amino. The ρ values of Hammett plot were given to be -0.506 in MeOH and -L009 in DMF at 60℃. This deviation of 4-amino group was considered to be attributed to the localization of π election on pyridine ring induced by the nitrogen atom and to be attributed to the resonance and solvent effects. From all of the results for substitutent effects, solvent effects and application of Hammett plot, the reaction was found as a typical S_(N)2 mechnism.

십자형 점용접부의 피로강도 평가에 관한 연구

최덕호,양경탁,김호경 서울産業大學校 2005 논문집 Vol.54 No.2

In this study, SPCC cross-tension type specimens produced under various welding conditions were tensile and fatigue tested. Decrease of 2 kA in normal current condition of 10 kA caused a large amount of reduction in both static joining strength and fatigue life. And 2 kA increase resulted in increase of static joining strength and an increase in low cycle regime but a decrease in high cycle regime, revealing the fact that fatigue strength rather than static joining strength would be a major factor during design process in view of the body endurance. As a results of estimating the fatigue lifetimes of various types of specimens, equivalent stress intensity factor is the proper parameter for predicting the lifetimes of various types of specimens, which can be expressed as ΔK_(eq) (N/mm^(1.5)) = 11550N_(f)^(-0.36)

우리나라 國民經濟의 에너지負擔

金浩卓 서울大學校 經濟硏究所 1985 經濟論集 Vol.24 No.3

신경병증성 통증 모델쥐 뒤뿌리신경절의 Nitric Oxide Synthase 아형 및 NADPH-diaphorase 발현에 관한 연구

정성균,김수일,양은진,류택근,권오유,박경란,이영호,김원식 충남대학교 의과대학 지역사회의학연구소 1998 충남의대잡지 Vol.25 No.2

Injury to peripheral nerve somtimes lead to neuropathic pain. Nitric oxide(NO) is increased in the dorsal root ganglia (DRG) of neuropathic pain models, and L-NAME, a nitric oxide synthase (NOS) inhibitor, reduces neuropathic pain. However, it is not known that underlying mechanism of NO involvement in development and maintanence of neuropathic pain. It was found that there were three NOS isoforms-nNOS, eNOS, and iNOS. It is also necessary to investigate NOS isoforms in neuropathic pain. The aim of this study is to investigate NOS isoforms and NADPH-diaphorase expressions and underlying mechanism of NO involvement in neuropathic pain. The 5^th lambar (L5) DRG were obtaind after tight ligation of L5 an L6 spinal nerves for 7 days. Toluidine blue stain, immunohistochemistry for nNOS, eNOS, and iNOS, and NADPH-diaphorase histochemistry were performed. All specimens were observed under light microscope. nNOS expression was increased significantly in the cytoplasm of the DRG of ligated side at 7 day post-ligation (7D PL). eNOS expression was also increased in the blood vessel, a few neurons or satellite cells, and cell membrane of Schwann cells in the DRG of ligated side at 7D PL. iNOS expression was increased in a few blood vessels and cytoplasm of small neurons in the DRG of ligated side at 7D PL. NADPH-diaphorase expression was increased significantly in the neurons of the DRG of ligate side at 7D PL, but NADPH-diaphorase expressions were weak or absent in the blood vessel and Schwann cell in the contralateral DRG and the DRG of ligated side at 7D PL. It is suggested that NOS isoforms may be closely related to development and mantanence of neuropathic pain in order of nNOS>eNOS>iNOS.

소장내 위석에 의한 장폐쇄증으로 발생한 급성신부전 1례

김승민,남지형,김준섭,이용국,최재혁,강혁주,탁우택,이정호,정호근 東國大學校醫學硏究所 2007 東國醫學 Vol.14 No.1

Gastric bezoars are concretions or hard masses of foreign matter found in the gastrointestinal tract. It may induce many complications including intestinal obstruction. No report has been proposed on a case of prerenal ARF induced by intestinal obstruction by small-bowel bezoar. Therefore, we report a case of the patient with ARF associated with small-bowel bezoar, who initially visited with the symptoms of nausea and frequent vomiting. 위석(bezoar)은 여러 가지 이물 및 내재성물질이 위장관내에서 혼합되어 응고물을 형성한 것을 말하며, 가장 흔한 형태의 합병증으로 장폐쇄증이 올 수 있으나, 그로 인하여 신부전의 양상으로 나타나는 경우는 흔하지 않다. 이에 저자들은 내원 당시의 병력 및 이학적 검사만으로 장폐색의 원인이 위석임을 의심할 수 없었던 비전형적인 소견을 보인 소장내의 위석에 의한 장폐쇄증과 이로 인해 발생한 급성신부전의 예를 경험하였기에 이에 보고하는 바이다.