http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
임플란트 고정체의 platform의 크기에 따른 유한요소법적 응력분석
정경민,정재헌,정승미,Chung Kyung-Min,Chung Chae-Heon,Jeong Seung-Mi 대한치과보철학회 2003 대한치과보철학회지 Vol.41 No.5
Statement of Problem : With increasing demand of the implant-supported prosthesis, it is advantageous to use the different platform width of the fixture according to bone quantity and quality of the patients. Purpose : The purpose of this study was to assess the loading distributing characteristics of two implant designs according to each platform width of fixture, under vertical and inclined loading using finite element analysis. Material and method : The two kinds of finite element models were designed according to each platform width of future (4.1mm restorative component x 11.5mm length, 5.0mm wide-diameter restorative component x 11.5mm length). The crown for mandibular first molar was made using UCLA abutment. Each three-dimensional finite element model was created with the physical properties of the implant and surrounding bone. This study simulated loads of 200N at the central fossa in a vertical direction, 200N at the outside point of the central fossa with resin filling into screw hole in a vertical direction and 200N at the buccal cusp in a 300 transverse direction individually Von Mises stresses were recorded and compared in the supporting bone, fixture, and abutment screw. Results : The stresses were concentrated mainly at the cortex in both vertical and oblique load ing but the stresses in the cancellous bone were low in both vertical and oblique loading. Bending moments resulting from non-axial loading of dental implants caused stress concentrations on cortical bone. The magnitude of the stress was greater with the oblique loading. Increasing the platform width of the implant fixture decreased the stress in the supporting bone, future and abutment screw. Increased the platform width of fixture decreased the stress in the crown and platform. Conclusion : Conclusively, this investigation provides evidence that the platform width of the implant fixture directly affects periimplant stress. By increasing the platform width of the implant fixture, it showed tendency to decreased the supporting bone, future and screw. But, further clinical studies are necessary to determine the ideal protocol for the successful placement of wide platform implants.
비정형 램프 및 방향 지시등을 포함하는 램프 페어링 기반 실시간 야간 저조도 차량 인식 알고리즘
정경민(Kyeong-Min Jeong),송병철(Byung-Cheol Song) 대한전자공학회 2017 대한전자공학회 학술대회 Vol.2017 No.6
In the nighttime environment, it is difficult to detection the vehicle because the image is dark and contrast is low. As a feature point that can be used in nighttime low light conditions, the rear lamp is virtually unique. However, rear lamp detection schemes do not adequately respond to irregular lamps or turn signal lamp. Also, it is difficult to use a rear lamp in a mid-light nighttime environment like a city center. In this paper, we identify the image as medium / low light environment. It also detects vehicles such as irregular lamps and turn signal lamp on real-time. Simulation results show that the proposed method has higher performance than conventional lamp pairing based method.