CAD/CAM 으로 제작된 Ceramic Inlay의 변연누출에 관한 비교연구

조병훈,이명종,임미경,이광원,손호현 大韓齒科保存學會 1997 Restorative Dentistry & Endodontics Vol.22 No.2

To compare the marginal leakage of CAD/CAM-fabricated ceramic inlay, gold inlay and amalgam, forty extracted caries-free premolars were prepared with Class Ⅱ MO cavity design. The teeth were divided into four groups of ten samples each. Group 1 was restored with CAD/CAM-fabricated ceramic inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 2 was restored with gold inlays cemented with Scotchbond Resin Cement / Scotchbond Multi-purpose plus. Group 3 was restored with gold inlays cemented with zinc phosphate cement. And, Group 4 was restored with amalgam. All samples were thermocycled, and stored in 1% methylene blue. Marginal leakage was examined at four margins, that is, occlusal distal, priximal gingival, occlsal facial and occlusal lingual margins from sectioned samples under steeomicroscope(x15). The results were as follows: 1. Group 1 and 2 showed no statistically significant difference among marginal leakage at all four examined margins(p>0.05). 2. Group 3 and 4 showed significant marginal leakage at proximal gingival margin compared with other margins(p<0.05). 3. Significantly increased marginal leakage at priximal gingival, occlusal facial and occlusal lingual margins in group 3 were observed compared with other groups(p<0.05).

이동 열원을 고려한 전자빔 용접의 유한요소해석

조해용,정석영,김명한,조창용,이제훈,서정 한국레이저가공학회 2001 한국레이저가공학회지 Vol.4 No.1

Simulation on the electron beam welding of Al 2219 alloy was carried out by using commercial FEM code MARC, which encounters moving heat sources. Due to axisymmetry of geometry, a half of the cylinder was simulated. A coupled thermo-mechanical analysis was carried out and subroutine for heat flux was substituted in the program. The material properties such as specific heat, heat transfer coefficient and thermal expansion coefficient were given as a function of temperature and the latent heat associated with a given temperature range is considered. As a result, the proper beam power is 60kVX60mA and welding speed is 1~1.5 m/min. The residual stress in the heat-affected zone as well as the fusion zone does not increase. It is necessary to use jigs for preventing distortion of cylinder and improving weld quality.

A7003 합금의 환경친화적 압출공정을 위한 Mg조성 및 공정비교 연구

조훈,조형호,한명근,김영직 한국전과정평가학회 2002 한국전과정평가학회지 Vol.4 No.1

최근 수송기계 경량화 추세에 부응하여 door impact beam, seat side rail 및 hood support와 같은 자동차 부품등에 Al-Mg-Zn계 중경질 A7003 합금소재의 적용이 검토되고 있는 실정이다. 그러나 이들 합금소재의 적용을 위해서는 제품의 용도와 특성을 만족함과 동시에 압출성이 높은 합금소재의 개발이 선행되어야 한다. 본 연구에서는 A7003 합금소재의 압출성을 향상시키기 위하여 합금원소 첨가량이 미세조직, 압출성 및 기계적 특성에 미치는 영향을 조사하였다. Mg조성 제어에 의해 기계적 강도의 저하없이 A7003 합금의 압출성을 향상시킬 수 있었다. 또한 MLCA 기법을 적용하여 A7003 합금중의 Mg 첨가량 및 빌렛가열공정 변화에 따른 에너지 소비량 및 환경오염부하물질 배출량을 산정하였다. A7003 합금중 Mg의 첨가량을 제어하여도 압출재 생산에 소요되는 에너지의 소비량은 거의 같음을 확인하였으며 CO₂와 같은 대기오염물질을 저감시키기 위해서는 유도가열에 의한 빌렛가열공정의 적용이 가장 효과적임을 알 수 있었다. A7003 alloy has characteristics of their excellent weldability, high corrosion resistance and superior plastic working however the broadening of application for the alloy has been hampered by the lower extrudability associated by Mg content. For improvement of extrudability and enhanced recovery efficiency during Al scrap recycling, it has been generally practiced to reduce Mg content in A7003 alloy. Therefore, it is necessary to investigate the influence of Mg content on mechanical strength and extrudability of A7003 alloy. For efficient material processing which has small amounts, material life cycle assessment(MLCA) is evaluated. The quantitative analysis of energy requirements and CO₂ emission for production of A7003 extruded bar are estimated with different Mg content and billet pre-heating process (heating source by light oil or LPG). In particular, the estimation of energy requirements was performed within shipping and gating range (except the mining and extraction stages) to investigate the influence of the variables on energy requirements and CO₂ emission in detail. As Mg content increased, the flow stress and the extrusion pressure for A7003 alloy increased. It has been thought that an increment in extrusion pressure with increasing Mg content is caused by the solid solution hardening of Mg atoms in the matrix and increment in volume fraction of intermetallic compound, Mg2Si. The extrudability and the tensile strength are equal to, or above that of conventional A7003 alloy even the content of Mg varied from 1.1wt.% to 0.5wt.%.alloy. This means that minimizing the content of Mg in A7003 alloy can enhance recovery efficiency during Al scrap recycling. It can be quoted that rather than Mg content energy source for billet heating is a prime factor to determine the atmospheric CO₂ emission.

지구자에 對한 文獻考察 및 最近 硏究 動向

신동훈,조명래 대한본초학회 2002 大韓本草學會誌 Vol.17 No.1

Objectives : So many kinds of disease are increasing tendency due to excessive alcohol ingestion, I reported some clues that the studies of origin, another name, property, related channels, effect, indication, contraindication for clinical use through oral administration and development of herb medicine acupuncture of Zhi Ju Zi, expecting the usage of relieving alcoholism that is like Pueraria root, Pueraria flower. Methods : 1. I investigated the 12 books of herbal medicine that Zhi Ju Zi was written in order of times. 2. I was looking for origin, another name, property, related channels, effect, indication, contraindication of Zhi Ju Zi which mentioned above 12 books of herbal medicine Conclusions : I reached conclusions as follows investigating of 12 herbal medicine books that origin, another name, property, related channels, effect, indication, contraindication of Zhi Ju Zi was written. 1. Zhi Ju Zi is fruit or seed attached peducle of pulpy substance of Hovenia dulcis THUNB. 2. Another names are Mi Qu Lu, Mu Mi, Mu Tang, Ji Ju Zi, Ji Zhao Zi. 3. Properties are sweet, even non-toxic and related to the channels of the heart, the spleen, the small intestine. 4. Pathogenic wind on head, lower abdomen rigidity, febrile disease, thirst, hiccup, vomiting, difficulty in urination, alcohol intoxication, fruit vegetable intoxication, paralysis, muscle numbness and unconsciousness are treated by the effect of relieving restlessness and thirst, clearing away upper heat, induce urination and defecation, relieving nausea, relieving roundworms intoxication 5. The person who has spleen-stomach biological energy deficiency with cold type is contraindicated, and over usage get roundworms.

廣域光陽灣地域의 機能配置에 關한 硏究

金明洙,盧春變,趙南勳 순천대학 새마을연구소 1987 새마을硏究論文集 Vol.3 No.-

The wide area of kwangyang Bay will be, in the 2000s, developed into a met­roploise with the main functions such as those of manufacturing industry, shipp­ing industry and harbor works, tourist and service industry. Such a development of the said area but to the development of national economy through attempting a balanced development of our country and solving the social disadvantages caused by centralization and accumulation. With this development of the area of kwanghang Bay, Sunchon-city not only as a center of culture, education and distribution but also as a comprehensive resea-rch complex of agriculture and industry should carry out a head function in the wide area of kwnagyang Bay. It should also establish Yeochon-city as stronghold of tourism and marine transportation and make the city at the rear of kwangyang Bay carry out the synthesized function as both a port and industrial city. Yeochon city should be developed into a residential area in the back of Yeo-chon Industry Complex : the city in the back of Yulchon should be developed in to the city with the function of a garden city. In addition, with the view of meeting the great increase in tourism demand, recreation facilities should be provided, and a closer connection with the sight-seeing areas of Jiri Mountain and Hanryosudo should be also built up. For the rational distribution and the full use of all functions of the wide area of kwangyang Bay, the expansion of social indirect capital such as the de-velopment of road, harbor, airport should be given the precedence.

임상간호사의 분권화, 전문성 및 의사결정의 관계

김태숙,조미경,이명훈 충남대학교 의과대학 지역사회의학연구소 1997 충남의대잡지 Vol.24 No.2

This study were conducted to analyze the correlations of decentralization, expertise and decision-making perceived by clinical nurses and to another relational factors. The subjects of this study were 190 clinical nurses who worked at two hospitals in Taejon city. The data were collected from August 4th to August 8th, 1997. The instruments for this study were Van de Van and Ferry's Job Authority Scale(4 items), Hage and Aiken's Hierarchy of Athoriy Scale(5 item), Vroom's Measure of Psychological Participation Scale(4 items), Hage and Aiken's Participation in Decision Making Scale(4 items), and 3 single items for expertise. The data were analyzed by use of percentage, ANOVA, and Pearson-Correlation Coefficient. The results of this study were as follows; 1. The degrees of participation in decision-making classified by education levels showed significant differences(P<0.05). 2. There was significant correlation between decentralization and participation in decision-making(P<0.01). Also there was significant correlation between participation in decision-making and education levels(P<0.01), and self-rating for expertise(P<0.05). 3. There was significant correlation between decentralization and total career of RN (P<0.01), and subject's age(P<0.05). Also significant correlation between participation in decision-making and total career of RN (P<0.001), and pattern of duty(P<0.01), and subject's age(P<0.001).

상아질 접착제의 중합 시간 조절에 따른 복합레진의 중합 수축 방향의 변화

배지현,오명환,김창근,손호현,엄정문,조병훈,권혁춘 대한치과보존학회 2001 Restorative Dentistry & Endodontics Vol.26 No.4

The purpose of this study was to evaluate the effect of adhesive curing timing on the direction of polymerization shrinkage of light-curing composite resin. In this study, the curing times of adhesive and composite resin were measured by differential scanning calorimeter(DSC). 28 extracted human molars were embedded in clear resin and box-type cavities were prepared. Based on DSC data. the experimental teeth were divided into 4 groups. Group 1: no bond: Group 2: late curing: Group 3: Intermediate curing: Group 4: Early curing. After treating with adhesive, the buccal cavities were filled with Z-100 hybrid composite resin and the lingual ones were filled with AEliteflo flowable composite resin. The depressions at the surface were measured by surface profilometer, then the specimens were embedded in clear resin and sectioned. Impressions were obtained and used to get epoxy resin replicas. The epoxy replicas were gold-coated and observed under SEM. Average Maximum Gap(AMG), Gap Proportion(GP), Average Marginal Index(AMI) were used to compare the shrinkage gap of each group. The results were statistically analyzed using the Kruskal-Wallis One Way ANOVA, Student-Newman-Keuls method. The results of this study were as follows. 1. Average Maximum Gap. Gap Proportion, Average Marginal Index and depression at the surface of Z-100 hybride composite resin were smailer than those of AEliteflo flowable composite resin(P(0.05) 2. When the bonding between composite resin and tooth structure was strong, the shrinkage gap was small, and depression at the surface was deep(P<0.05). 3. In the well-bonded group. light-curing composite resin shrank toward bonded cavity wall. not toward light source. The result suggested that the direction of polumerization shrinkage was affected by the quality of bonding in the dentin-resin interface. The strong was the bonding between composite resin and tooth structure, the smaller was the gap and the deeper was the depression at the surface. Then the flow to compensate the polymerization shrinkage proceeded from surface to bonded cavity wall.

대퇴 전자간 골절에서 금속정 고정술 시행결과 : 감미정과 근위 대퇴정의 비교 Comparision Gamma Nail and proximal Femoral Nail

고상봉,조명래,김태훈,장일웅 대한골절학회 2004 대한골절학회지 Vol.17 No.4

목적: 대퇴 전자간 골절 환자에서 감마정과 근위 대퇴정으로 내고정을 시행하고 방사선학적, 임상적 결과 및 합병증을 비교하여 각각의 장단점을 분석하고자 하였다. 대상 및 방법: 1999년 1월부터 2002년 2월까지 대퇴 전자간 골절로 감마정과 근위 대퇴정을 이용하여 고정한 환자 중 방사선학적 및 임상적으로 6개월 이상 추시가 가능하였던 63예를 대상으로 하였으며 감마정군이 31예, 근위 대퇴정군이 32예이었다. 연령, 골절의 형태와 안정성에 따른 분류, 동반 질환, 골다공증의 정도, 환자의 활동 능력 등이 양 군에서 차이가 없었다. 평가방법으로는 두 군 사이의 수술시간, 출혈량, 안정정복 획득의 감입 정도 등을 비교하였다. 결과: 수술시간은 감마정군은 평균 103±40분, 근위 대퇴정군에서 101±28분으로 통계적인의미는 없었으며 (p=0.801), 수술 중 출혈량은 근위 대퇴정군에서 적은 경향을 보였으나 통계적인 의미는 없었다(p=0.601). 술 후 골절의 안정성 획득 여부는 감마정군 30%, 근위 대퇴정군 31%에서 안정 정복을 얻어 사용기구에 따른 고정의 안정성 획득에는 유의한 차이가 없었으며(p=0.934), 술 후 내반 고정의 빈도와 골절부위의 1.28단계의 보행능력 감소를, 근위 대퇴정군에서 평균 0.86단계의 보행능력 감소를 보여 역시 통계적으로 의미있는 차이는 없었다(p=0.383). 결론: 대퇴 전자간 골절치료에 있어서 임상적 및 방사선학적인 결과에서는 의미있는 차이는 없었으나, 근위 대퇴 골수정이 수술시간, 출혈량 등의 수술 수기의 측면에서 조금 더 우수한 경향을 보였다. Purpose: To evaluate the clinical and radiologic results of the fracture using the Proximal Femoral Nail(PFN) or Gamma nail in patient with the intertrochanteric fracture. Materials and Methods: From January 1999 to February 2002, we reviewed 63 patients of intertrochanteric fractures including 31 patients managed with Gamma nail and 32 patients with PFN. In variate analysis of age, the pattern and stability of fracture, bone density(Singh index), preoperative patient activity, there was no difference between two groups. We evaluated the operation time, blood loss, stable reduction rate and varus reduction rate as operation-related factors, and radiologically investigated union, time, the frequency of delayed union and nonunion, failure of fixation, status of the fracture line and complications. Functional results were evaluated by the possibility of early ambulation, ambulation ability at last follow up, and the pre and postoperative difference of ambulatory ability. Results: Mean operation time was 103±40 minutes in Gamma nail group 101±28 minutes in PFN group. It was not statistically significant(p=0.801). Even though intraoperative blood loss was less in PFN group, it was significant(p=0.601). Postoperative stable reduction rate was 31% in Gamma nail group and 30% in PFN group(p=0.934), suggesting not significant. Postoperative varus reduction and impacted amount of the fracture ling was not significant. Delayed union developed in one case of Gamma nail group and 2 cases of PFN group. Mean loss of ambulation ability was 1.28 grade in Gamma nail group and 0.86 grade in PFN(p=0.383). Statistical analysis was performed with the use of Student T test and Chi-square test. Analyses resulting in a p value of <0.05 were considered to show significance. Conclusion: Generally, the radiologic and clinical results of intertrochanteric fractures were comparable for the PFN group and Gamma nail group. Even though it was not statistically significant, PFN group had superior results in operation time blood than Gamma nail group for the fixation of the patients with interchanteric fracture.

열처리 시간에 따른 니켈전기도금층의 집합조직 변화

김인수,홍상철,조경식,오명훈,김인기 金烏工科大學校 1999 論文集 Vol.20 No.-

Ni electrodeposits having preferred orientation can be obtained by various electrolysis conditions. Ni electrodeposits were annealed at 580℃ with various time. Ni electrodeposits having (100) texture did not change, (110) texture changed to various texture after recrystallization

흰쥐에 있어서 Ethanol과 Phenobarbital이 트리클로로에틸렌 대사에 미치는 영향

이경종,노재훈,김치년,조명화,차봉석,문영한 大韓産業醫學會 1993 대한직업환경의학회지 Vol.5 No.1

Trichloroethylene is widely used for organic solvent in many industries. There are many workers who are exposed to trichloroethylene in Korea. If workers are exposed to trichloroethylene after ingestion of ethanol or phenobarbital, there might be an increased risk of toxicity due to combined exposures of chemicals. This study was performed to find out the influences of ethanol and phenobarbital on the levels of trichloroethylene in rats. Trichloroethylene was administered orally at the doses of 150, 750, 1,500, and 3,000mg/kg after pretreatment of 4g/kg ethanol or 80mg/kg phenobarbital. Trichloroethylene in blood was not detected at 12 hours after oral administration of trichloroethylene. Administered amount of trichloroethylene and its total blood concentration had a positive relationship. The level of blood trichloroethylene was decreased faster in ethanol and phenobarbital pretreated groups than in the control group. Amounts of urinary free trichloroethanol were larger at the doses of 150, 750, and 1,500mg/kg of trichloroethylene with pretreated phenobarbital group than in the control group. Total amounts of urinary conjugated trichloroethanol were larger in pretreated ethanol and phenobarbital groups than in the control group. In the phenobarbital pretreated group, there was a increasing tendency of excertion of urinary trichloroacetic acid. These results showed that intake of ethanol and phenobarbital may alter the metabolism of trichloroethylene in rats.