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        • KCI등재

          접착제와 와동형성의 차이에 따른 5급 복합레진 수복의 전향적 임상연구

          이경욱,정세준,한영철,손호현,엄정문,오명환,조병훈 大韓齒科保存學會 2006 Restorative Dentistry & Endodontics Vol.31 No.4

          본 연구의 목적은 복합레진을 이용한 비우식성 치경부 5급 병소 수복에 있어서, 3가지 다른 접착제를, 유지구를 부여한 치아와 부여하지 않은 치아에 적용하였을 때의 임상적인 효능의 차이를 비교하기 위함이다. 총 150개의 치아를 각각 25개씩 6개의 군으로 나누었다. A군 Scotchbond Multi-Purpose (SBMP, 3M ESPE, St, Paul, MN, USA, 4세대 접착제)를 사용하고 유지구를 부여하지 않음. B군: SBMP를 사용하고 유지구를 부여. C군: BC Plus (Vericom Co., Anyang, Gyeonggido, Korea, 5세대 접착제)를 사용하고 유지구를 부여하지 않음. D군: BC Plus를 사용하고 유지구를 부여. E군: Adper Prompt (3M ESPE, Seefeld, Germany, 6세대 접착제)를 사용하고 유지구를 부여하지 않음. F군: Adper Prompt를 사용하고 유지구를 부여. 모든 치아는 복합레진인 Denfil(Vericom Co., Anyang. Gyonggido. Korea)을 이용하여 충전하였다. 수복 직후와, 수복 6개월 후에 modified USPHS (United States Public Health Service) criteria에 따라 수복물을 임상적으로 평가하였다. 추가적으로 임상사진을 촬영하였으며, 에폭시 레진을 이용하여 복제한 후 주사전자현미경을 이용하여 이를 관찰하였다. 6개월 후 관찰 결과. alpha rating의 수가 각 실험군마다 동일하지는 않았지만, 통계적으로는 3가지의 접착제간에 유의할만한 차이는 없었고, 기계적인 유지구를 부여한 군과 부여하지 않은 군 간에도 유의할만한 차이는 없었다 (p > 0.05). 그러나 6개월의 관찰 기간은 일반적으로 기대되는 레진의 수명보다 짧기 때문에, 각 실험군 간의 차이를 알아보기 위해서는 추후 더 오랜 기간의 관찰이 요구된다. The purpose of this study is to evaluate prospectively the effect of different bonding systems and retention grooves on the clinical performance of resin restorations in non-carious cervical lesions (NCCLs). Thirty nine healthy adults who had at least 2 NCCLs in their promolar areas were included in this study. One hundred and fifty teeth were equally assigned to six groups; (A) Scotchbond Multi-Purpose (SBMP, 3M ESPE, St, Paul, MN, USA, 4th generation bonding system) without retention grooves; (B) SBMP with retention grooves: (C) BC Plus (Vericom Co., Anyang, Gyeonggido, Korea, 5th generation bonding system) without retention grooves; (D) BC Plus with retention grooves; (E) Adper Prompt (3M ESPE, Seefeld, Germany, 6th generation bonding system) without retention grooves: (F) Adper Prompt with retention grooves. All cavities were filled with a hybrid composite resin, Denfil (Vericom Co., Anyang, Gyeonggido, korea) by one operator. Restorations were evaluated at baseline and at 6-month recall, according to the modified USPHS (United states Public Health Service) criteria, Additionally, clinical photographs were taken and epoxy resin replicas were made for SEM evaluation. At 6-month recall, there were some differences in the number of alpha ratings among the experimental groups. But, despite the differences in the number of alpah ratings, there was no significant difference among the 3 adhesive systems (p > 0.05). There was also no significant difference between the groups with or without mechanical retention (p > 0.05). Follow-ups for longer periods than 6 months are needed to verify the clinical performance of different bonding systems and retention grooves. 〔J Kor Acad Cons Dent 31(4):300-311, 2006〕

        • KCI등재

          우수방사성의약품 생산시설 개발

          신병철,정원명,박상현,이규일,박경배,박진호 한국약제학회 2003 Journal of Pharmaceutical Investigation Vol.33 No.2

          Manufacturing facilities of the pharmaceuticals must meet certain level of the cleanness required so that foreign substances such as dust, moisture, heat, microorganism, or virus do not contaminate the product. In case of radiopharmaceuticals for medical treatment and diagnosis, not only should the operators and environment be protected from radiation but also need to be isolated from the foreign contaminant. Therefore, manufacturing facilities for radiopharmaceuticals must satisfy the design standards of both hot cell and clean room which are specified by GNP. However, standards of maintaining negative pressure for preventing spread of radioactive contaminant in isolated facilities conflict with the standards of maintaining positive pressure for keeping cleanness. To solve this problem, are pressure of hot cell was designed lower than in the adjacent area to meet standards of the radiation safety. To keep higher cleanness in certain part of the hot cell for filling, minimal relative positive pressure allows. In order to effectively maintain the cleanness that is required for production of Tc-99m generator, which takes 70% of whole demand of radiopharmaceuticals, the rooms placed in each side of production room are used as a buffer area and three lead hot cells are installed in production room. In this research, we established the appropriate engineered design concept for Tc-99m generator manufacturing facility, which satisfies both GMP cleanness standard for preventing particles, bacteria, other contaminants and the regulations of radiation safety for supervising and controlling the amount of radiation exposure and exhausted radioactivity. And the concept of multi-buffer zones is introduced to apply negative air pressure for hot cell with first priority and to continue relative positive air pressure for clean room.

        • KCI등재

          하악골 골절후의 골치유과정에 있어서 방사선학적 추적조사

          최진영,김명호,허경희,서병무,이종호,정필훈,김명진 대한악안면성형재건외과학회 2000 Maxillofacial Plastic Reconstructive Surgery Vol.22 No.5

          The results of radiographic study of healing of fractured mandible are often inconsistent with clinical evaluation of bone healing pattern of it. In addition, there is inconsistency between radiographic studies. We think if such inconsistency is resolved, clinical assessment combined with radiologic evidence can be used to guide to more accurate clinical management. The purpose of this study is to evaluate radiological healing pattern of mandible, and to apply its result to clinical use. Panoramic view was used to analyze the change of radiographic finding in 35 patients (27 male, 8 female, ranging 17 to 53 years old) treated for mandibular fracture at the department of oral & maxillofacial surgery, SNUH in the period 1991 to 1998, Patients are all treated by rigid internal fixation using monocortical miniplate. Within 9 weeks, no change is observed at fracture site. Osteogenic change is observed at various time interval (3 to 21 weeks). We have found radiographic change of healing is observed 4 to 6 weeks later to clinical healing, According to this result, we recommend radiographic follow-up at 4 week, 10 week, 10 month.

        • SCOPUSKCI등재

          Comparison of the Short-term Clinical Results of Silicone and Acrylic Intraocular Lens in Patients with Diabetes Mellitus

          Ho Kyung Choung,Jin Hak Lee 대한안과학회 2001 Korean Journal of Ophthalmology Vol.15 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          In order to compare the clinical results of silicone intraocular lenses (IOLs) and acrylic IOLs in patients with diabetes mellitus (DM), we reviewed the records of 69 diabetic patients (79 eyes - 40 eyes;silicone IOLs, 39 eyes; acrylic IOLs) who had undergone phacoemulsifications and posterior chamber intraocular lens (PCL) implantations between January 1994 and January 1999. Postoperative ocular examinations included measurements of uncorrected and best corrected visual acuity tests and recording any complication one day, one week and two months after surgery. There was no statistically significant difference in visual acuity between the eyes with silicone IOLs and those with acrylic IOLs. Additionally, there was no difference in visual acuity according to the method of blood sugar level control. The rate of posterior capsular opacity (PCO) was significantly lower in the patients with acrylic IOLs than in those with silicone IOLs (p<0.05). These results suggest that there is no difference in visual outcome between acrylic IOLs and silicone IOLs in patients with DM. However in view of the lower rates of PCO with acrylic IOLs, they may be a better choice for eyes in diabetic patients.

        • 근시정도에 따른 황반원공에 의한 망막박리의 예후

          정호경 ( Ho Kyung Choung ),정흠 ( Hum Chung ) 대한안과학회 2002 대한안과학회지 Vol.43 No.2

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        • KCI등재
        • KCI등재

          C-Store 칼럼-지향 DBMS에서의 최적화 Join 기법 구현

          김경호(Kyung Ho Kim),백우현(Woo Hyoun Back),손지은(Ji Eun Son),김충석(Choung Seok Kim),김경창(Kyung Chang Kim) 한국정보과학회 2014 정보과학회 컴퓨팅의 실제 논문지 Vol.20 No.2

          칼럼-지향(column-oriented) DBMS란 기존 DBMS에서의 대표적 저장 방식인 row단위로 저장했던 것(로우-지향, row-oriented)과 달리 칼럼(column) 단위로 데이터를 저장하고 관리하는 DBMS를 말한다. 이러한 저장기법의 차이는 효율적인 질의 처리의 전반적인 메커니즘에 있어 로우-지향 DBMS와 다른 방식을 요구하게 된다. 이 논문에서는 칼럼-지향 데이터베이스에 대한 스타 스키마 질의의 효율적인 조인 기법을 다루었다. 본 논문은 조인 맵핑 트리를 이용한 칼럼-지향 조인 기법을 실제 오픈 소스인 C-Store 칼럼-지향 DBMS에서의 구현을 상세히 설명하였고 성능 분석을 실시하였다. A column-oriented DBMS is a DBMS that stores and manages data column-wise unlike conventional DBMS that stores data in rows or row-oriented manner. The difference in the storage structure in a columnoriented DBMS requires a query processing mechanism different from row-oriented DBMS methodology. This paper involves an efficient join technique for star schema queries in column-oriented databases. The paper explains in detail the implementation performance analysis of a column-oriented join technique using a join mapping tree structure in C-Store, an open source column-oriented DBMS.

        • 당뇨병이나 고혈압에 의한 허혈성 안근마비의 임상양상

          정호경 ( Ho Kyung Choung ),장봉린 ( Bong Leen Chang ) 대한안과학회 2002 대한안과학회지 Vol.43 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        • KCI등재

          눈물샘에 발생한 일차성 국소성 아밀로이드증 1예

          최혁진 ( Hyuk Jin Choi ) , 정호경 ( Ho Kyung Choung ) , 곽상인 ( Sang In Khwarg ) 대한안과학회 2004 대한안과학회지 Vol.45 No.9

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

        • KCI등재

          Frequency of the Angiotensin

          Ho Jin Choung,Song Ro Yoon,Soo Kyung Choi 대한의학유전학회 1999 대한의학유전학회지 Vol.3 No.1

          '스콜라' 이용 시 소속기관이 구독 중이 아닌 경우, 오후 4시부터 익일 오전 7시까지 원문보기가 가능합니다.

          Recently it was reported that an Insertion / Deletion polymorphism In the gene coding for Angiotensin - Converting Enzyme (ACE) is associated with human capacity for physical performance. This study was performed to genotyping of the ACE gene to determine the correlation between elite endurance performance and ACE I/D gene polymorphism. DNA sample was obtained from peripheral blood, hair roots and mouth epithelial cell in 739 general population and 200 elite athletic performance students. The ACE gene was amplified by polymerase chain reaction (PCR) using allele specific oligonucleotide primers. 155, 525 bp and 237 bp PCR products indicating the presence of insertion(I) and deletion(D) alleies, respectively, were clearly resolved after electrophoresis on a 2% agarose gel with ethidium bromide. Of the 200 elite athletic performance population subjects, 68 (34%) showed ACE genotype 11, 100 (50%) genotype ID and 32 (16%) genotype DD. Of the 739 general population subjects, 259 (35.1%) showed ACE genotype 11, 363 (49.1%) genotype ID and 117 (15.8%) genotype DD. Therefore ACE I/D gene polymorphism was not associated with human capacity for physical performance.(p > 0.05)

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