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다단계 반응표면법을 이용한 치과용 임플란트의 3차원 형상최적설계
한중석,최주호,김종수 대한기계학회 2004 大韓機械學會論文集A Vol.28 No.7
In this paper, an optimum design problem for endosseous implant in dentistry is studied to find best implant design. An optimum design problem is formulated to reduce stresses arising at the cortical as well as cancellous bones, in which sufficient design parameters are chosen for design definition that encompasses major implants in popular use. Optimization at once (OAO) with the large number of design variables, however, causes too costly solution or even failure to converge. A concept of multilevel optimization (MLO) is employed to this end, which is to group the design variables of similar nature, solve the sub-problem of smaller size for each group in sequence, and this is iterated until convergence. Each sub-problem is solved based on the response surface method (RSM) due to its efficiency for small sized problem.
보철물 조건에 따른 Periotest수치의 실험적 평가
한중석,Han, Jung-Suk 대한치과보철학회 1997 대한치과보철학회지 Vol.35 No.4
Periotest(Siemens, Germany) has been used to test mobility of the implants clinically, however the effects of target materials and connection methods on the PTVs(Periotest Values) have not been evaluated. Periotest has been regarded as a reliable and objective tool to test implant and natural teeth mobility clinically, however this instrument showed different PTVs under various test conditions. This in vitro study was designed to compare PTVs of different veneering materials and prosthodontic designs (single and bridge restorations). To compare the effects of veneering materials on PTVs, 1 mm thickness of five different testing materials (porcelain, type III gold alloy, pure titanium, composite resin, acrylic resin) were placed on the resin block. Three full length of 13 mm Mark II implant fixtures were embedded into autopolymerizing resin block to fabricate single and bridge restorations. To evaluate effects of the connection method in single restorations, PTVs of screw retained(UCLA type) and cementation type(Cera-One system) were compared. Finally, to test reliability of PTVs of the final restorations, screw retained three unit short span PFM bridges were fabricated on the standard and Estheti-Cone abutments. All testing components were tightened with torque controller and PTVs of all specimens were measured 15 times for statistical analysis with SAS program. Following conclusions were made within the limit of this in vitro study. 1. PTVs of type III gold alloy, grade II titanium, composite resin veneering materials showed no significant differences, however acrylic resin and porcelain showed significant differences (P<0.05). 2. Single tooth restorations showed consistent PTVs as long as proper torque force was applied. 3. PTVs of bridge type prostheses was inconsistent regardless of abutment types. 4. PTVs of the prostheses showed higher scores and standard deviations than those of abutments regardless types of connection (P<0.05).
서울시 정비구역 해제에 따른 매몰비용의 공공부담에 관한 연구
한중석(Han, Jung-Seok),최민섭(Choi, Min-Seub) 한국주거환경학회 2015 주거환경(한국주거환경학회논문집) Vol.13 No.4
The purpose of this study is to suggest the reasonable legal principles in relation to public burden of sunk costs incurred in process of rearrangement projects for providing assistance in legislation or dispute resolution. This study attempted to analyze literature such as theses, articles in journals, the National Assembly bills and the review reports, the National Assembly records of proceedings, the Supreme Court precedents, the Constitutional Court decisions, press releases, and Seoul metropolitan survey data on cancellation of rearrangement zones and sunk costs. In addition, this study attempted to analyze the current status and system associated with cancellation of rearrangement zones and subsidy of sunk costs. And then it raised the legal issues such as the justification, object, subject, degree of public burden of sunk costs. The results of the study are as follows: First, the public burden of sunk costs incurred in process of rearrangement projects is justified since rearrangement projects have publicness. Second, sunk costs incurred in process of rearrangement projects by the association as well as by the promotion committee should be shared by public sector since there is no difference in substance between the two. Third, sunk costs incurred in process of rearrangement projects should be shared by national government as well as by local government since national government is directly or indirectly involved in rearrangement projects. Last, sunk costs incurred in process of rearrangement projects should be shared by public sector under the principle of publicness, profitability, and responsibility.