다양한 골 이식재의 임상 효과에 대한 고찰

이승범,연제영,채경준,정의원,김창성,이용근,조규성,채중규,김종관,최성호,Lee, Seung-Bum,Yon, Je-Young,Chae, Gyung-Joon,Jung, Ui-Won,Kim, Chang-Sung,Lee, Yong-Geun,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2007 Journal of Periodontal & Implant Science Vol.37 No.4

Purpose: Various bone graft materials are being used for periodontal tissue regeneration. Th materials are being developed continuously for ideal clinical effects. Therefore, it is necessary to identify the clinical characteristics of each bone graft material through comparing the various bone graft materials statistically and in doing so, proposing a more efficient bone graft material. In this study, the following results were attained through comparing the clinical effects among the bone graft materials, using the statistical method based on the clinical studies published at the department of periodontology of Yonsei hospital. Materials and Method: 6 selected studies of department of Periodontology at Yonsei University Hospital were based on clinical study of bone grafting in intrabony defects. It was compared the clinical parameters among the 6 clinical studies, using the statistical META analysis. Result: When comparing the probing depth reduction, there was a relatively great amount of decease when using the xenograft, Anorganic Bovine Derived Hydroxapatite Bone Matrix/Cell Binding Peptide(ABM/P-15: PepGen $P-15^{(R)}$) and the autogenous bone and absorbable membrane, d, 1-alctide/glycolide copolymer(GC: $Biomesh^{(R)}$). The allogfrafts showed a relatively low decrease in the probing depth and clinical attachment change. It also showed a slight decrease in the bone probing depth. The allografts showed various results according to different bone graft materials. When comparing the ABM/P-15 and bovine bone $powder(BBP^{(R)})$, ABM/P-15 showed a relatively high clinical attachment level and the bovine bone powder showed a relatively high clinical attachment level. The probing depth change and gingival recession change showed a lower value than the mean value between the two bone graft materials. The synthetic bone showed a relatively high decrease in clinical attachment level and periodontal probing depth change. There was a relatively larger amount of gingival recession when using Bioactive Glass(BG) but a relatively low bone regeneration effect was seen. Conclusion: Good restorative results of the periodontal tissue can be attained by applying the various bone graft materials being used today after identifying the accurate clinical effects.

FEM을 이용한 GMA 용접공정의 비드형상 모델링

박창언,김일수,장영호,정영재,손준식,배수연 木浦大學校 工業技術硏究所 1997 工業技術硏究誌 Vol.7 No.-

Over the last few year, there has been a growing interest in quantitative representation of heat transfer phenomena in weld pools in order to relate the processing conditions to the quality of the weldment produced and to use this information for the optimisation and robotization of the welding process. Normally, a theoretical model offers a powerful alternative to check out the physical concepts of the welding process and to calculate the effects of varying any of parameters. To solve this problem, a transient 2D(two-dimensional) heat conduction model were developed for determining weld bead geometry and temperature distribution for the GMA welding process. The equation was solved using a general thermofluid-mechanics computer program, PHOENICS code, which is based on the SIMPLE algorithm. The simulation results showed that the calculated bead geometry from the developed model reasonablely agrees with the experiment results.

좌측 기관지 협착을 동반한 폐동맥슬링 1예

이지연,정조원,홍창호 아주대학교 1997 아주의학 Vol.2 No.1

Pulmonary artery sling is a rare congenital vascular anomaly in which the left pulmonary artery arises aberrantly from the proximal part of the right pulmonary artery and encircles the right main bronchus and distal trachea before entering the hilum of the left lung. This causes compression of the trachea and right main bronchus, and most infants with this anomaly have severe respiratory distress within the first year of life. Associated anomalies are common, and particularly, tracheobronchial anomalies occur in 40% of the patients. Major cardiovascular anomalies including ventricular septal defect, atrial septal defect, patent ductus arteriosus, tetralogy of Fallot, common ventricle, and coarctation of the aorta, occur in about half of the affected infants. We have experienced an 11-month-old male infant with respiratory distress, wheezing, and cyanosis. He was diagnosed as pulmonary artery sling associated with left bronchial hypoplasia by echocardiography, angiography, and chest CT scan. Other associated anomalies were left kidney agenesis, right megaureter and right kidney hypertrophy, diagnosed by abdominal sonography and IVP. We report this case with a brief review of literature.

양산시 하수관거의 불명수 산정을 위한 유량 및 수질특성

최호은,김한석,정연화,김대용,성낙창 東亞大學校 建設技術硏究所 2008 硏究論文集 Vol.31 No.2

The objective of this study were to investigated the water quantity and quality characteristics of sewer infiltration/inflow(I/I) computation in Yangsan City. infiltration/inflow(I/I) were evaluated the water-use evaluation, average daily minimum flow-water quality evaluation and minimum daily flow evaluation. Flow meter for infiltration/inflow(I/I) evaluation was used the FLO-TOTE II. Contaminant came into very low concentration at all sampling points as BOD5 standard. Also, I/I evaluation during dry weather on maximum daily infiltration flow-water quality evaluation, maximum-minimum daily flow evaluation, average daily-minimum flow-water quality evaluation is desirable than water-use evaluation. Because that infiltration/inflow(I/I) amount is much different than other evaluation methods.

크론병에 대한 CoPPLX의 방어효과에 대한 연구

이호학,김유림,문창기,이재일,양병윤,김종수,이정민,정재혁,안석진,박상준,김윤권,김소연,김영중,조민구,최영자,장성조 圓光大學校 醫科學硏究所 2005 圓光醫科學 Vol.20 No.1

환자 만족도 조사를 통한 QI활동의 효과 평가 : 일개 병원을 중심으로

박연옥,김미숙,고은정,김연정,홍창호 한국의료QA학회 1998 한국의료질향상학회지 Vol.5 No.2

Background : Evaluation of patient's satisfaction is one of the most important aspects of quality improvement. If the patient highly satisfies with the medical service provided in the hospital, he/she will be likely to visit the same hospital again. Patient's satisfaction of a particular hospital is directly correlated with hospital profits as well as reputation in the community. For this reason, various kinds of survey measuring satisfaction level have been performed and many kind of QI activities for enhancing the profits as well as reputation in the community. For this reason, various kinds of survey measuring satisfaction level have been performed and many kind of QI activities for enhancing the patient's satisfaction. This study is to find the effect of hospital QI activities on the patient's satisfaction level. Methods : After questionnares were developed, survey of measuring satisfaction level was performed in August. 1998. On the basis of survey results. Ql activities were carried out to attain the target point of 4.0 and subsequent survey was done in November. 1998. Results : With three main principles of "problem solving approach with kindness". "helping patient to participate in medical procedure with sufficient information", and "putting employees into practice of attitude with human respect", the average level of satisfaction was enhanced from 3.45 to 3.55 level. Also kindness level of employees was increased from 3.71 to 3.82. Level of dissatisfaction about insufficient explanation and unkind attitude was dropped from 69% to 48% and from 82% to 46% respectively. Conclusion : With the result of this study overall satisfaction level was enhanced. In order to keep these advantages a operation of Quality Improvement Task Force Team in each subject will be required.

졸-겔공정을 이용한 초고용량 캐패시터용 Nickel oxide 나노입자의 합성

김두현,송기창,변태강,송연호 조선대학교 생산기술연구소 2003 生産技術硏究 Vol.25 No.2

The Ni (OH)₂ nanoparticles with average diameter of 50 nm were synthesized by hydrolyzing nickel acetate with water, and were dispersed in the distilled water to prepare the coating solution. The electrodes for supercapacitor were prepared by dip-coating the coating solution on the Ni-foam. The electrodes heat-treated at several temperatures showed the highest specific capacitance, 160 F/g, at 250℃. It can be explained that the Ni(OH)₂ particles heat-treated at 100 and 200℃ on the electrodes contained the impurities such as acetate groups in the pores, and resulted in low specific surface areas. However, as the calcination temperature increases. the impurities incorporated in the pores are removed at 250℃, and thus, the particles on the electrodes show the highest specific surface area (177 ㎡/g).

파인애플 흰깍지벌레의 생태조사 및 방제시험

권오균,송창길,김용호 제주대학교 1984 논문집 Vol.17 No.-

컨버루션 코드를 利用한 通信系統의 에러 訂正

최상일,정연호,강창언 연세대학교 산업기술연구소 1984 논문집 Vol.16 No.1

A decorder is developed for correcting the single burst of errors. The convolutional code of Type-B2 is used for this purpose. This decoder has the ability to correct all bursts confined to m-l or fewer consecutive blocks with a guard space of the(m-1) consecutive error free blocks. A simple logical circuitry, having the same order of complexity as a pairity check circuit for a block code, is implemented to correct the errors in a communication system. The decoder used the (18,12) convolational code is designed and tested. Experimental results confirm the error-correcting ability.

위암종과 Epstein-Barr 바이러스와의 연관성에 대한 연구

심광용,김호영,김효열,백순구,권상옥,조미연,이창훈,이종인 건국대학교 의과학연구소 2004 건국의과학학술지 Vol.14 No.-

Objectives: Epstein-Barr virus (EBV) has been known to be linked to a spectrum of neoplastic conditions, including nasopharyngeal carcinoma, Burkitt's lymphoma, peripheral T-cell lymphoma and Hodgkin's disease. This study aims to investigate the association of EBV with gastric carcinoma in Korea. Methods: Fifty-three cases of gastric adenocarcinoma were studied for evidence of EBV infection by EBV-encoded small RNA (EBER) in situ hybridization (ISH) on the paraffin sections and amplifying the EBV genome encoding envelop glycoprotein (gp220) with polymerase chain reaction (PCR) in fresh gastric cancer specimens. Results: EBER was detected in 7 (13.2%) of 53 gastric carcinomas and all cases were male. In 6 (85.7%) of 7 EBER-positive cases, the tumors were located in the upper and middle part of the stomach. EBER ISH study showed strong positivity in all the tumor cells, but negativity in surrouning lymphocytes, stromal cells and normal gastric mucosa. DNA PCR was positive in 23 (43.4%) of 53 gastric carcinomas, including all of 7 EBER-positive cases. Conclusion: We could observe some association of EBV with gastric carcinoma, and our findings about the charateristics of EBV-positive gastric cancers involving sex, site and histological type are similar to those in Japan. However, EBV-positive rate of gastric cancer is higher than in Japan and lower than in Western countries. Further studies to elucidate oncogenic mechanism of EBV in gastric cancer should be performed.