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임플란트 조임나사의 종류에 따른 임플란트 보철의 유한요소법적 응력분석
윤승현,신종연,정재헌 朝鮮大學校 口腔生物學硏究所 1997 口腔生物學硏究 Vol.21 No.1
The purpose of this study was to examine the stresses in implant prosthessis and fixture according to the type of implant fastening screw. We used a finite element model of cylinder type implant with a diameter of 4mm and a length of 14mm, including hex-lock structure for single prosthesis, and classified the type of screw into three models (T model : titanium screw, G model : gold screw, I model : titanium screw with IME). After finishing the finite element models, these models were divided into in the vertical load of 200N and in the 30°lateral load of 200N and then they were analyzed for 3-dimentional finite element analysis. The results were as follows ; 1. Under the vertical and lateral load, compressive stress and maximum tensile stress were concentrated on the neck of fastening screw. 2. Under the vertical load of 200N, the magnitude of maximum tensile stress originated from the neck of fastening screw was 23.51㎏/㎟ on the model T. 25.1㎏/㎟ on the model G, and 13.85㎏/㎟ on the model I. 3. In case of using IMC the magnitude of distortion was larger than model T and G, in such a case the stress was dispersed along the IMC, that's why the absolute magnitude of the whole stress of fastening screw was smaller than model G and T. 4. Under the lateral load of 200N, on the model T the amount of displacement was -0.013㎜ on the left(L) and 0.013㎜ on the right(R) of the prosthesis, on the model G it was -0.0127㎜(L) and 0.0104㎜(R) and on the model I it was -0.0145㎜(L) and 0.0115㎜(R). 5. In case of IMC because lateral and vertical displacement was large, it is predicted that the screw will be easily loosened. 6. Under the lateral load it show that stress support was taken at the lateral wall of Hex-lock, therefore if upper prosthesis are precisely fit for Hex-lock structure, it is considered that it hardly makes a difference in the clinical application between gold screw and titanum screw.
임프란트 조임나사의 종류에 따른 임프란트 보철의 유한 요소법적 응력 분석
윤승현,신종연,정재헌 대한치과이식임플란트학회 1997 The Korean Academy of Implant Dentistry Vol.16 No.1
The purpose of this study was to examine the stresses in implant prosthessis and fixture according to the type of implant fastening screw. We used a finite element model of cylinder type implant with a diameter of 4mm and a length of 14mm, including hex-lock structure for single prosthesis, and classified the type of screw into three models (T model : titanium screw, G model : gold screw, I model : titanium screw with IM E ). After finishing the finite element models, the vertical load of 200N to central fossa or the 30° lateral load of 200N at the cusp tip of the prostheses was applied respectively. The results were as follows ; 1. Under the vertical and lateral load, compressive stress and tensile stress are concentrated on neck of fastening screw. 2. Under the vertical load on, model G is largest and model I is smallest. But under the lateral force, stress is model T is largest and model I is smallest 3. Under the vertical load, each model showed very large stresses at upper facet of implant and line angle of external hex, and arround axial wall of supporting screw. 4. lateral load produced more total stresses than vertical load.
공동주택 개발 사업의 분양시기 변동에 따른 수익성 비교.분석에 관한 연구
윤승현,강현욱,김용수,Yoon, Seung-Hyeon,Kang, Hyun-Wook,Kim, Yong-Su 한국건설관리학회 2009 건설관리 : 한국건설관리학회 학회지 Vol.4 No.2
본 연구는 공동주택 개발사업의 분양시기 변동에 따른 수익성 비교 분석을 목적으로 수행되었다. 이를 위해 민간건설업체가 수행한 공동주택 사업인 중형주택($60m^2\sim85m^2$이하)과 대형주택($85m^2$초과)을 사례대상으로 선정하였다. 다음으로 사례대상의 공동주택 개발사업비용을 조사하고 분양시기 변동에 따른 수익성을 분석하였다. 상기와 같은 목적과 방법에 따라 진행된 본 연구의 결론을 요약하면 다음과 같다. 첫째, 공동주택 개발사업의 수익성에 미치는 영향요인은 분양시기, 분양대금 납부방법, 분양율 등인 것으로 조사되었다. 둘째, 후분양 시의 수익성 분석결과 정부가 추진 중인 공정율 80% 이후 분양의 경우 세 개 사례 모두 $4.4%\sim4.9%$의 수익률이 악화되는 것으로 분석되었다. The purpose of this study is to analyze of profitability accordance to the different sales timing in apartment housing development projects. The adapted research method about public apartment hosing development projects by a private construction company is concentrated on the middle and large scale housing. The methodology for analysis of profitability through the change of timing for sales is analysed. According to this methodology, the difference of profitability by different timing of first sales is compared and analyzed. The results of this study are as followed 1)The major factors to affect the profitability for apartment housing development project consist of the timing of sales, the method of payment and the rate of sales. 2) The case study was carried out and then the profitability is analyzed the profitability for the three of cases is got worse when the sale after construction especially on the time of construction progress rate 80% is carried out.
원수 특성 변화 및 공정운영 조건에 따른 해수담수화 에너지 소비량 분석
윤승현,우달식 대한상하수도학회 2019 상하수도학회지 Vol.33 No.4
Desalination plants are generally studied with higher operating costs compared to water supply facilities. This study was conducted to reduce the cost of water production and to preserve existing water resources. Therefore, the purpose of this study was to utilize the control valves to increase maximum efficiency, thereby reducing the power of the pumps and operating costs. Specific energy consumption was shown to reduce the process operating power by up to 1.7 times from 6.17 to 3.55 kWh/m3 based on seawater reverse osmosis 60 bar. In addition, the water intake process was divided into pre, inter, and post-according to the use method of blasting, and the water treatment process was divided into pre, inter, and post blending. In order to reduce power consumption, the blending process was combined to operate the facility, which resulted in the reduction of power consumption in the order post > pre-inter> inter blending.
윤승현,김성택 대한수면연구학회 2006 Journal of sleep medicine Vol.3 No.2
Sleep apnea syndrome is very common breathing disorder, which can cause significant health problem and poor quality of life. Among several treatments of sleep apnea syndrome, oral appliance treatment has been used effectively in some sleep apnea syndrome. Since then, mandibular advancement devices (MAD) have become a common treatment for obstructive sleep apnea (OSA) and are used to increase the caliber of the airway during sleep. Nevertheless, it appears that only a small percentage of patients will quit using a MAD because of temporomandibular joint (TMJ) or masticatory muscle soreness. So patients using MADs must be monitored regularly for ongoing efficacy and for associated complications. In this article, the history of MAD and the efficacy of this appliance for OSA will be discussed.
Transferring Skin Weights to 3D Scanned Clothes
윤승현,김태준,김호원,이지은 한국전자통신연구원 2016 ETRI Journal Vol.38 No.6
We present a method for transferring deformation weights of a human character to three-dimensional (3D) scanned clothes. First, clothing vertices are projected onto a character skin. Their deformation weights are determined from the barycentric coordinates of the projection points. For more complicated parts, such as shoulders and armpits, continuously moving planes are constructed and employed as projection reference planes. Clothing vertices on a plane are projected onto the intersection curve of the plane with a character skin to achieve a smooth weight transfer. The proposed method produces an initial deformation for physically based clothing simulations. We demonstrated the effectiveness of our method through several deformation results for 3D scanned clothes.