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간접유치장치 설계변화에 따른 하악유리단 국소의치의 광탄성 응력분석
강승종,계기성,Kang, Seung-Jong,Kay, Kee-Sung 대한치과보철학회 1990 대한치과보철학회지 Vol.28 No.2
The purpose of this study was to analyse the magnitude and distribution of stresses using a Photoelastic model from and distal - extension removable partial dentures With four designed indirect retainers. The designs of the indirect retainers were as follows : Design No. 1 : Aker's clasp on 1st bicuspid with no indirect retainer. Design No. 2 : Aker's clasp on 1st bicuspid with indirect retainer on canine. Design No. 3 : Extension of the reciprocal arm of Aker's clasp toward incisal rest on canine. Design No. 4 : Connection with the indirect retainer as in No. 2 and extension of reciprocal arm of Aker' s clasp. A photoelastic model was made of the epoxy resin(PL - 1) and hardner(PLH - 1) and coated with plastic cement -1(PC -1) at the lingual surface of the epoxy model and set with chrome - cobalt partial dentures. A unilateral vertical load of 10kg to the right 1st molar and a vertical load of 10kg to the middle portion of the metal bar crossing both the 1st molars of the right and left, were applied. With the use of specially designed jig, fixture; loading device and the reflective circular polariscope, we obtained the following results : 1. When the unilateral vertical load and the vertical load of the middle portion of the metal bar were applied, design No. 2, 3 and 4 exhibited the higher stress concentration at the root apices and their surrounding tissues of the primary and secondary abutment teeth. 2. When the unilateral vertical load applied to design No. 2,3 and 4 the root apices of the primary and secondary abutment teeth and their surrounding tissues and the nonloaded side of edentulous area exhibited and even stress distribution. 3. When the vertical load was applied, the stress concentration fringe in the primary and secondary abutment teeth was in the order of No. 1,4,2 and 3. 4. No.1 and 4 exhibited the higher distrorted stress concentration at the primary teeth and the edentulous area in the nonloaded side. 5. No.2 design reduced the stresses at the apices of the alveoli of the primary abutment teeth bilaterally as well as on the crest of the residual ridge on the nonloaded side. 6. No. 2 design exhibited the most favorable stress distribution.
Twin tables technique 이용유무에 따른 구치이개량의 비교에 관한 연구
강승종,계기성,이훈재 朝鮮大學校 口腔生物學硏究所 1998 口腔生物學硏究 Vol.22 No.1
The purpose of this study was to compare the accuracy of the reproducibility of the disocclusion as the disclusion of the articulator and the patient's mouth was experimented with three kinds of method. The prosthetic temporary resin restoration was fabricated to the patients who needed a single crown or a 3-unit bridge at the molar teeth of the upper and lower arch, and the disocclusion of the molar teeth was compared at the articulator and patient's mouth respectively during the eccentric movement, that is, the protrusive, non-working and working movement. The method measuring the disocclusion after the prosthetic temporary resin restoration adjusting the condylar guidance with the check-bite recorded form each patient was fabricated(method 1), the method measuring the disocclusion after the prosthetic temporary resin restoration using the eccentric condylar path of the patient at the twin table technic was fabricated(method 2), and the method measuring the disocclusion after the prosthetic temporary resin restoration using the returning condylar path of the patient at the twin table technic was fabricated(method 3) were used, and the disocclusion amount was compared after the prosthetic resin restoration was fabricated at the articulator first, and then it was transfered to the patient mouth. At this time, the measurement of the disocclusion amount was carried out at the articulator and the patient's mouth respectively using the leaf gauge. The following results were obtained : 1. The three kinds of method had significance statistically in comparison with the reproducibility of the disclusion of the articulator and the patient's mouth(p<0.05). 2. Method 1 and Method 2 had no significance statistically, but Method 2 had greater reproducibility of disclusion clinically. 3. Method 3 had greater error of the reproducibility of disclusion comparing with Method 1 and Method 2. 4. The reproducibility of disclusion at the eccentric movement in each method had no significance statistically(p>0.05).
가스터빈 시스템의 성능 및 NOx 배출 예측을 위한 모사방법
이한구,강승종,이찬,Lee, Han-Goo,Kang, Seung-Jong,Lee, Chan 한국에너지학회 1994 에너지공학 Vol.3 No.1
가스터빈 사이클의 성능 및 NOx 배출물 생성량 예측을 위한 모사 프로그램을 개발하였다. 압축기 및 터빈은 등엔트로피 과정으로, 연소기는 Thermal NOx 생성을 수반하는 연소모형으로서 가정하였다. 또한 터빈 냉각을 위한 추출공기량과 냉각방식이 성능에 미치는 적절한 상관 관계식을 도입하여 평가하였다. 본 성능평가 모델을 이용하여 예측된 결과와 실험결과간의 비교를 통하여 모델의 타당성을 검증하였고, 증기 분사량, 터빈 냉각변수 및 압축비 변화에 따른 예측결과를 통하여 가스터빈 시스템 최적 운전 및 설계기준을 제시하였다.