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전창주,김준철,정석민,박영준 대한치과기재학회 2001 대한치과재료학회지 Vol.28 No.1
This study investigated the permanent deformation of dental rubber impression materials in order to evaluate their degree of recovery from displacement during removal through undercut area. We also investigated the stain in compression in order to evaluate the materials' flexibility during removal from the month, or during removal of the cast from the impression. Additional silicone, polyether, and polysulfied rubber impression materials were tested for their properties of permanent deformation and strain in compression according to the testing methods of the ADA specificaltion no. 19. 1.The permanent deformation values were as follows: polysulfide (2.25%), polyether (2.14%), and additional silicone (0.28∼1.21%, 2.38% for Perfect F). Examix, Express and Provil, which are additional silicone rubbers, showed lower permanent deformation values of 0.29%, 0.28% and 0.34%, respectively. Perfect F, although it is an additional silicone rubber, showed the highest permanent deformation value (2.38%) within the tested materials. 2.The strain in compression values were as follows: polysulfide (10.63%), additional silicone (2.88∼10.09%), and polyether (2.38%). The additional silicone rubber samples showed various values. Contrary to our expectations, it is also notable that Vinylate, which is used when taking an one-step impression, had higher stain in compression value (10.09%) than the light body impression materials even though it is classified as a heavy body material. Express (a.s.) had a low strain in compression (2.88%) which is similar to that (2.83%) of Impregum F (p.e.). In light body rubber materials, Permlastic had the highest value (p.s. 10.63%), followed by Perfect F (a.s. 7.38%), Correct VPS (a.s. 7.13%), Examix (a.s. 6.04%), Provil (a.s. 3.82%) and Express (a.s. 2.88%). Although the tested materials showed various values, all of them satisfied the requirements of A.D.A. Specification No. 19, which require that permanent deformation be less than 2.5%, and strain in compression be between 2∼20%.
전창주 ( Chang Joo Chung ) 한국농공학회 1966 韓國農工學會誌 : 전원과 자원 Vol.8 No.1
옥수수 수확에 딩면되는 기계의 능력을 결정하고 부셀(Bushel) 마다의 수확비용, 농촌에서의 옥수수 건조 비용과 닥케이지(Dockage)에서의 비용과의 비교, 그리고 콤바인 작업시의 최적 설치 조건을 조사하기 위하여 미국 캔사스주립대학교 농공학과 실험농장에서 일련의 실험과 관측을 행하였다. 그 결과를 요약하면 수확 비용은 20.44ø/Bu 였고, 농가에서의 직접 건조비용이 8ø/Bu 였는데 비하여 닥게이지 비용은 25ø/Bu 이었다. 그러므로 농가에서의 직접 건조로서 17ø/Bu을 절약할수 있다는 결론에 이른다. 또한 콤바인의 작업 능력은 75%의 작업 효율을 기초로 계산하면 1.14 acre/hr 였으며 콤바인 설치조건의 변화에 따른 수확손실은 그림 (1)에 표시된 바와 같이 넷째 시험조건에 최적하다는 것을 알수있었다.