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성견 1벽성 골내낭 결손부의 조직재생에 대한 수종의 차폐막의 조직학적 평가
양진혁,채경준,윤정호,송시은,이용근,조규성,김종관,최성호,Yang, Jin-Hyuk,Chae, Gyung-Joon,Yun, Jeong-Ho,Song, Si-Eun,Lee, Yong-Keun,Cho, Kyoo-Sung,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.1
Purpose: In dental clinical fields, various periodontal membranes are currently used for periodontal regeneration. The periodontal membranes are categorized into two basic types: resorbable and non-resorbable. According to the case, clinician select which membrane is used. Comparing different membranes that are generally used in clinic is meaningful. For this purpose, this study evaluates histological effects of various membranes in canine one wall intrabony defect models and it suggest a valuation basis about study model. Material and Method: The membranes were non-resorbable TefGen $Plus^{(R)}$, resorbable Gore Resolut $XT^{(R)}$ and resorbable $Osteoguide^{(R)}$. One wall intrabony defects were surgically created at the second and the mesial aspect of the fourth mandibular premolars in either right or left jaw quadrants in two dogs. The animals were euthanized 8 weeks post-surgery when block sections of the defect sites were collected and prepared for histological evaluation. Results: 1. While infiltration of inflammatory cells were observed in control, TefGen $Plus^{(R)}$ and Gore Resolut $XT^{(R)}$, it was not observed in $Osteoguide^{(R)}$. 2. TefGen $Plus^{(R)}$ had higher integrity than others and $Osteoguide^{(R)}$ was absorbed with folding shape. Gore Resolut $XT^{(R)}$ was divided everal parts during resorbtion and it was also absorbed from inside. 3. Quantity of new bone and new cementum was not abundant in all membranes. 4. For histologic evaluation of membranes we should consider infiltration of inflammatory, migration of junctional epithelium, integrity of membrane, quantity of new bone and new cementum, connective tissue formation and aspect of resorption. Conclusion: This histologic evaluation suggests that $Osteoguide^{(R)}$ provides periodontal regenerative environment with less inflammatory state. It is meangful that this study model suggests a valuation basis about other study model.
양진혁,조성란,현봉학,임영애,이위교 대한진단검사의학회 2002 Annals of Laboratory Medicine Vol.22 No.4
일년 전 SLE로 진단받은 19세 여자 환자가 치핵절제술 후 발열, 현기증 및 수술부위 출혈로 입원하였다. 입원당시 CBC는 좌방이동을 동반한 범혈구감소증(혈색소 6.2 g/dL, 백혈구수1,20/ L, 혈소판수 11,000/ L)을 보였으며, 섬유소분해산물과D-dimer는 양성이었다. 패혈증 및 DIC로 치료하였으며, 중증 호중구감소증으로 G-CSF를 두 차례 투여하였다. 말초혈액에서 과립이 많은 전골수구가 대부분인 미성숙 골수구와 백혈구의 증가가 관찰되었으나, G-CSF를 투여한 효과로 간주되었다. 입원 5일째, 폐 침윤의 원인을 규명하기 위한 기관지폐포세척액에서 Auer체를 포함하고 있는 전골수구가 관찰되어 골수검사 및 염색체 검사를 하였고, 급성전골수성백혈병으로 진단되었다. 환자는 입원 9일째, 패혈증성 쇽으로 사망하였다. 저자들은 SLE 환자에서 G-CSF의 사용 및 패혈증으로 인하여 진단이 지연되었던 급성전골수성백혈병이 동반된 1예를 경험하였기에 문헌고찰과 함께 보고하는 바이다.
데이터 웨어하우스에서 클러스터링 기법을 이용한 실체화 뷰 선택 알고리즘
양진혁,정인정,Yang, Jin-Hyuk,Chung, In-Jeong 한국정보처리학회 2000 정보처리논문지 Vol.7 No.8
In order to acquire the precise and fast response for an analytical query, proper selection of the views to materialize in data warehouse is very crucial. In traditional view selection algorithms, the whole relations are considered to be selected as materialized views. However, materializing the whole relations rather than a part of relations results in much worse performance in terms of time and space cost. Therefore, we present an improved algorithm for selection of views to materialize using clustering method to overcome the problem resulted from conventional view selection algorithms. In the presented algorithm, ASVMRT(Algorithm for Selection of Views to daterialize using Iteduced Table). we first generate reduced tables in clata warehouse using automatic clustering based on attrihute-values density, then we consider the combination of reduced tables as materialized views instead of the combination of the original hase relations. For the justification of the proposecl algorithm. we show the experimental results in which both time and space cost are approximately 1.8 times better than the conventional algorithms. 데이터 웨어하우스에서 실체화 할 뷰들을 알맞게 선택하는 것은 분석적인 질의에 대한 정확하고 신속한 응답을 얻기 위해서 대단히 중요한 문제이다. 기존의 뷰 선택 알고리즘들에서는 릴레이션 전체가 실체화 뷰들로서 고려되었다. 그러나, 릴레이션의 부분 대신 전체를 실체화한다는 것은 시간과 공간 비용측면에서 좋지 못한 성능을 초래한다. 따라서, 우리는 기존 뷰 선택 알고리즘들에서의 문제점을 극복하기 위해서 개선된 실체화 뷰 선택 알고리즘을 제안한다. 제안된 알고리즘 ASVMRT(Algorithm for Selection on Views to Materialize using Reduced Table)에서는 먼저 속성-값들의 농도에 기반을 둔 자동 클러스터링을 사용하여 축약 테이블들을 데이터 웨어하우스에서 생성한 다음, 원래의 베이스 릴레이션들의 조합 대신에 축약 테이블들의 조합을 실체화 뷰들로 고려한다. 제안한 알고리즘의 타당성 검증을 위하여 우리는 실험결과에서 시간 및 공간 모두에서 기존 알고리즘들보다 약 1.8배의 성능향상이 있음을 보인다.
키토산의 치주조직 재생력에 대한 연구의 고찰: 조직계측학적 메타분석
양진혁,채경준,윤정호,정의원,이용근,조규성,채중규,김종관,최성호,Yang, Jin-Hyuk,Chae, Gyung-Joon,Yun, Jeong-Ho,Jung, Ui-Won,Lee, Yong-Keun,Cho, Kyoo-Sung,Chai, Jung-Kiu,Kim, Chong-Kwan,Choi, Seong-Ho 대한치주과학회 2008 Journal of Periodontal & Implant Science Vol.38 No.1
Purpose: Chitosan & chitosan derivative(eg. membrane) have been studied in periodontal regeneration, and recently many studies of chitosan have reported good results. If chitosan's effects on periodontal regeneration are enhanced, we can use chitosan in many clinical and experimental fields. For this purpose, this study reviewed available literatures, evaluated comparable experimental models. Materials and Methods: Ten in vivo studies reporting chitosan's effects on periodontal tissue regeneration have been selected by use of the 'Pubmed' and hand searching. Results: 1. In Sprague Dawley rat calvarial defect models, amount of newly formed bone in defects showed significant differences between chitosan/chitosan-carrier/chitosan-membrane groups and control groups. 2. In beagle canine 1-wall intrabony defect models, amount of new cementum and new bone showed significant differences between chitosan/chitosan-membrane groups and control groups. The mean values of the above experimental groups were greater than the control groups. Conclusion: The results of this study have demonstrated that periodontal regeneration procedure using chitosan have beneficial effects, which will be substitute for various periodontal regenerative treatment area. One step forward in manufacturing process of chitosan membrane and in use in combination with other effective materials(eg. bone graft material or carrier) may bring us many chances of common use of chitosan in various periodontal area.