Celay System을 이용한 In-Ceram Alumina 3 Unit Bridge제작법

조병완,Jo, Byung-Woan 대한심미치과학회 1996 Journal of the Korean Academy of Esthetic Dentistr Vol.5 No.1

In nowdays many dental CAD/CAM system were developed. Among those only Cerec and Celay were used globally as clinical application. Celay is a machinable ceramic system that is capable of milling inlays, onlays, and veneers from prefabricated industrial ceramic blocks(Vita Celay Blanks). The advatages of Celay are to simplify the manufactures and to save the processing time. For esthetics In-Ceram Alumina bridges were introduced into maxillary anterior restoration. They have a high strength, a high translucency and an excellent marginal adapation. But the laboratory processes are very difficult and complicated. So the construction of In-Ceram Alumina bridge combined with celay system was desgined. The patient is a 28 year old age male. The chief complain is missing of maxillary left central incisor. He wants to restore anterior bridge for esthetically. The Alumina bridge framework was constructed easily by celay system. Glass ilfiltration was occurred. After that, vitadura-${\alpha}$porcelain build up was occurred by conventional method. The translucency of In-Ceram Alumina 3 unit bridge revealed to be superior to that of porcelain fused to metal bridge. So we report it with clincal case and literature reviews.

치아형태를 고려한 지대치형성

조병완,Jo, Byung-Woan 대한심미치과학회 2000 Journal of the Korean Academy of Esthetic Dentistr Vol.9 No.1

치아형태라고 하면 따분하고 재미없는 것으로 생각하기 쉽지만, 치과임상에서 아주 중요한 기초를 형성하고 있다. 지대치형성은 치과보철수복의 첫 단계로서, 좋은 지대치형성은 좋은 보철물로 연결된다. 또한 치과보철 수복의 대부분은 원래의 치아형태수복에 맞추어져 있어서, 치아형태와 지대치형성은 많은 상관성을 가지고 있을 것이라고 유추해 볼 수 있다. 그러나 통상적으로 알고 있는 치아형태는 교합변형태로만 인식하고 있어서, 지대치형성시 치아형태가 큰 도움을 주지는 못하는 실정에 있다. 물론 교합면형태도 중요하지만 그외의 여러형태도 치과임상에 있어서 결코 무시할 수 없다. 필자는 지대치형성에서 고려해야 할 치아형태와 임상적 중요성에 대해서 언급하여 치과의사선생님들의 임상에 도움을 주고자 한다.

U-City 구현을 위한 3D-Web GIS 기반의 가상도시 시스템

조병완,이윤성,윤광원,박정훈,Jo, Byung-Wan,Lee, Yun-Sung,Yoon, Kwang-Won,Park, Jung-Hun 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.5

최근 IT산업 기술의 발전으로 U-City가 전국적으로 추진되는 가운데 유비쿼터스를 효과적으로 구현하기 위해 도시 구성요소 표현 매체인 수치지도(map)와 위성영상, 인터넷 가상세계구현 표준 언어인 VRML(Virtual Reality Modeling Language)를 이용하여 현실세계의 U-City를 그대로 모사한 3차원 3D-가상도시 개념을 정립하였다. 가상도시(V-City)에서는 USN기반의 수많은 데이터베이스 자료와 지능형 서비스정보를 언제 어디서나 상황인지 하기 위하여 실시간 유, 무선 통신 네트워크와 연계시킨 가상도시 개념을 통해, 방대한 양의 유비쿼터스 정보와 서비스를 효율적으로 제어, 처리하기 위한 HTML 자바 애플릿과 인터페이스를 제공하는 EAI(External Authoring Interface)방식을 채용하여 RFID/USN으로 구축된 도시 생활정보를 효율적으로 연동시킴으로써 지능화된 유비쿼터스 컴퓨팅 생활서비스를 구현하는 전 세계 공간 위치 개념의 GPS, LBS, 내비게이션 시간개념의 RTLS와 함께 4차원개념의 유비쿼터스 가상도시(U&V-City) 시스템을 제안하였다. U-City has been promoted nation-wide by development of recent IT technology. This paper studied the concept of 3D-virtual city in order to realize the current Ubiquitous City(U-City) efficiently, and to manage all the RFID/USN monitoring data in the real U-City. 3D-Virtual City is the concept of the reproduction of real world U-City, for embodying Ubiquitous technology while using Digital map, satellite image, VRML(Virtual Reality Modeling Language). U&V-City is the four-dimensional future city that real-time wire/wireless communication network and 3D-web GIS shall be connected that massive database, intelligent service be perceived through employing EAI(External Authoring Interface) that provides HTML&JAVA, and interface for efficient removal/process of massive information/ service and also by employing GPS/LBS/Navigation in support of world-wide orientation concept, and RTLS(Real Time Location System).

석회석(石灰石) 미분말(微粉末)을 이용(利用)한 그린모르타르의 강도(强度) 특성(特性)에 관한 연구(硏究)

조병완,최지선,김경태,Jo, Byung-Wan,Choi, Ji-Sun,Kim, Kyung-Tae 한국자원리싸이클링학회 2013 資源 리싸이클링 Vol.22 No.3

최근 사회기반 구조물이 대형화, 특수화, 다양화 되어감에 따라 강도적인 측면과 환경적인 측면에 부합하는 건설재료를 필요로 하고 있다. 따라서, 시멘트 제조시 주원료인 석회석 미분말을 사용하여 에너지 감축과 $CO_2$발생을 절감하고자 하였으며, 환경부하 저감형 건설재료로 부각되고 있는 고로슬래그, 플라이애쉬를 사용하고자 하였다. 본 연구에서는 수화생성물의 결합력에 따른 화학적 특성을 고려해 내구성 측면을 파악하고자 한다. 그 결과 3일 압축강도가 30 Mpa 이상 측정되었다. 또한 석회석 미분말의 사용량이 증가함에 따라 응결시간이 빨라지고, 길이변화에서 팽창되는 특징을 가지고 있다. 그리고 보통 포틀랜드 시멘트를 사용하였을 때와 비교하여 재령 7일 이전에는 휨강도가 높은 것으로 측정되는 등 기존 건설용 재료를 대체할 가능성이 충분하다고 판단되어진다. According to the recent community-based structures enlargement, specification, and diversification. It needs appropriate construction materials in terms of intensity and environmental aspects. Thus, in manufacturing the cement using micro limestone powder which is main material. It is also expected to save energies and reduces $CO_2$, by using the blast furnace slag and fly ash which are mitigated environmental load construction materials that emerged. In this research, The durability aspect tries to be grasped considering the chemical property according to the coherence of the hydration product. Consequently, The compressive strength was measured over 30 Mpa on 3rd. In addition, according to the content of the limestone powder, the setting time is promoted. It has the feature expanded in the length change. And it is determined because the possibility of replacing the existing for construction material such as it is measured compared with the time to use the portland cement usually that flexural strength is high with the age 7 days ago, so it is sufficient.

아스팔트포장 도로의 유지관리체계 개선에 관한 연구

조병완,한상주,Jo, Byung-Wan,Han, Sang-Joo 한국도로학회 2003 한국도로포장공학회 논문집 Vol.5 No.1

본 연구에서는 과거의 비과학적인 포장관리의 한계를 극복하기 위해, 포장 상태를 정확하게 판단하고. 분석하여 적절한 유지보수 방법을 제시할 수 있는 경제적이고 효율적인 포장도로 유지관리 시스템(PMS)을 개발하였다. 우선 PMS에 관한 국내 외 자료와 서울시 포장 조사 데이터를 이용해서 포장 조사에서 분석 평가, 의사 결정 등의 일련의 과정에 대한 논리적 알고리즘을 구성하고, 국내 외 연구사례와 상세육안조사 결과를 통해서 이러한 알고리즘의 적합성을 평가하였다. 또한 개발된 알고리즘을 바탕으로 도로 관리자가 쉽게 사용할 수 있도록 통합 시스템으로서 PMS 프로그램과 GIS 프로그램을 개발하였다. In this study, developed economic and efficient Pavement Management System (PMS) that can produce suitable M/R method through estimation and analysis of pavement condition exactly, to overcome past unscientific pavement management limitations. First on the basis of data of the inside and outside of the country on PMS and pavement condition data of Seoul metropolitan, composed logical algorithm such as pavement condition investigation and analysis, detailed eye investigation whole system estimation etc, and it verified that this algorithm is suitable system through the inside and outside of the county PMS research examples and results of detailed eye investigation. Also, Considering user interface, developed PMS program and GIS program with such logical algorithm.

Finite Element Analysis of Planar Effect on the Concrete Pavements

조병완,Jo, Byung Wan Korean Society of Civil Engeneers 1994 대한토목학회논문집 Vol.14 No.5

콘크리트 포장구조에 있어서 온도팽창과 건조수축으로 인한 평면 변위 거동은 차량 하중에 관계없이, 포장슬래브와 노반과의 마찰에 의한 줄눈의 개폐에 주로 기인하고 있다. 따라서 콘크리트 포장구조의 평면 변위 거동을 해석하기 위하여 한 절점에서 dx, dy, 2 자유도를 갖는 직사각형 평면요소의 강성행열과 마찰, 건조수축, 온도 등으로 인한 등가절점 하중을 유도하였다. 콘크리트의 건조수축으로 인한 포장슬래브의 구조해석결과, 슬래브 길이가 길거나 지반과의 마찰계수가 큰 경우를 제외하고는, 큰 응력은 발생하지 않았지만, 차량하중과 조합할때는 인장응력의 증가와 함께 포장 슬래브에 균열이 발생할 수 있음을 보여주고 있다. Since horizontal movements due to shrinkage and thermal gradients in concrete pavements involve no actual load, the stresses induced will be those due to closing of the pavement joints and subbase friction. Consequently, complete derivations of stiffness matrix and equivalent nodal loads due to planar effects on the concrete pavements was throughly undertaken using the finite rectangular elements with two degrees of freedom at each node. The numerical example shows that the tensile stress induced in a pavement due to concrete shrinkage might be negligible except at very long slab and very high coefficient of frictions. However the stresses in conjunction with principal traffic loads might cause cracking problems.

센서네트워크를 이용한 FCM 교량의 처짐 관리 방안 연구

조병완,태기호,권오혁,Jo, Byung-Wan,Tea, Ghi-Ho,Kwon, Oh-Hyuk 한국방재학회 2008 한국방재학회논문집 Vol.8 No.4

본 연구에서는 FCM 교량의 시공 시 발생하는 처짐과 시공 후 발생하는 처짐의 관리를 위해 센서 네트워크를 활용한 처짐 관리 기술을 제안하고자 하였으며, 센서에 의한 검증실험과 제안된 USN를 이용하여 실제 건설되어지고 있는 현장에 적용함으로써 그 효율성을 입증하였다. 향후, USN은 교량의 장거리 건전도 모니터링에 매우 유용할 것이라 생각된다. Ubiquitous technology is proposed which is used wireless sensor network for deflection management at casting and after casting of FCM bridge. Proposed method are analyzed which are sensor experiment and existing FCM bridge using ubiquitous sensor network. Wireless sensor network enables low-cost sensing of environment. As a results, the field application shows that USN is useful method for structural health monitoring system which long distance away.

유비쿼터스 기술을 이용한 교량 안전관리 방안 연구

조병완,김도근,노승현,김헌,Jo,Byung-Wan,Kim,Do-Keun,No,Seung-Hyun,Kim,Heoun 한국방재학회 2008 한국방재학회 학술발표대회논문집 Vol.2008 No.1

Nowadays in order to estimate safety diagnosis of bridge, a lot of data like static and dynamic displacement, accelerometer, wind velocity and so on are demanded. When it comes to measure these data, cabled sensor is essential equipment. But cabled sensors have also inefficient factors. From this point of view, considering practical aspects of using these expensive equipments which have been used to examine safety diagnosis, measuring by cabled sensors is restrictive in some respect. Recently to improve theses problems, Wireless sensor system was introduced. But this system can`t perform intelligent reaction because database of this system is just based on internet. In this paper, the intelligent bridge safety management model which can be installed easily, measured at all times and dealing intelligently with various situations is developed to improve these problems.

저작운동에 미치는 치열궁형태의 영향에 관한 연구 II. 저작운동의 분석에 대하여

조병완,Jo Byung-Woan 대한치과보철학회 1994 대한치과보철학회지 Vol.32 No.4

Using Sirognathograph Analyzing System, the patterns of chewing movement were analyzed into opening phase and closing phase, each phase to frontal plane, horizontal plane, and sagittal plane by maruyama's classification. In opening phase, the chewing patterns of frontal plane were classifed into Chopping Opening, Grinding Opening, Concave Opening, Lateral Shift Opening, Vertical Guide Opening, Convergence Opening. Those of horizontal plane were classified into Chopping Opening, Grinding Opening, Concave Opening, Protrusive Shift Opening, Posterior Guide Opening, Convergence Opening. Those of sagittal plane were classified into Normal Opening, Protrusive Shift Opening, Vertical Guide Opening, Convergence Opening. In closing phase, the chewing patterns of frontal plane were classified into Normal Closure, Concave Closure, Lateral Shift Closure, Lateral Guide Closure, Vertical Guide Closure, Convergence Closure, Those of horzontal plane were classified into Normal Closure, Concave Closure, Lateral Shift Closure, Protrusive Shift Closure, Lateral Guide closure, Posterior Guide Closure, Convergence Closure. Those of sagittal plane were classified into Normal Closure, Protrusive Shift Closure, Vertical Guide. Closure, Convergence Closure. Results were summarized as follows : 1. Opening phase in chewing movement The Normal Openings in 3 planes(frontal, horizontal, sagittal), the Concave Openings in frontal plane and horizontal plane, the Vertical Guide Opening in frontal plane and the Posterior Guide Opening in horizontal plane were many observed. 2. Closing phase in chewing movement The Concave Closure in frontal and horizontal plane, the Normal Closure in 3 planes (frontal, horizontal, sagittal), the Concave Closure in horizontal plane were many observed.

In-Ceram Alumina Bridge Restoration의 단기예후에 관한 임상적연구

조병완,박재범,안재진,Jo, Byung-Woan,Park, Jae-Bum,Ann, Jye-Jynn 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.3

All ceramic restorations except In-Ceram Alumina system gave a good esthetics and an exellent marginal fidelity. The flexural strength of them had about 150MPa, so the indication is only single crown. By using In-ceram Alumina System(450Mpa), it is thought to be possible to construct bridge for its high flexural strength. But the prognosis is unclear, The purposes of this study are to clear short term prognosis of In-Ceram bridge restorations, to elucidate its clinical significance. Among 22 In-Ceram Bridge restored in our department, 11 In-Ceram bridges with follow up were used. The period of placement is from 1 to 18 months. The results were as follows : 1. Among follow up 11 bridges, 2 bridges were fractured. One is 4 unit in maxillary lateral incisors, the other is 3 unit bridge in maxillary canine and premolar. Including 11 bridge without follow up, failure rate is very low(2/22). 2. The fracture sites are connector areas between abutment and pontic. To maintain In-Ceram bridge for long term period, it is needed to remove the nonphysiologic occlusal force and to have sufficient thickness of alumina core. For estabilishing clinical use of In-Ceram bridges, it is thought to need clinical research during long term period.