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Residual strain measurement of piezoelectric multilayers by spiral structure
박준협,Young-Ryun Oh,Hyun-Suk Nam,김윤재,Tae-Hyun Kim,김희연 대한기계학회 2012 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.26 No.7
A new structure is described to measure the residual strain of thin film of piezoelectric multi-layers. The spiral shaped structure consists of the four fixed-guided beams. Piezoelectric multilayers consisting of SiOx/Pt/PZT/Pt on SiNx substrate are used to evaluate the suggested structure. Finite element analysis predicts that the out-of-plane displacement of the spiral structure by residual stress depends linearly on the beam length, but there is little difference depending on the beam width. PZT is prepared by sol-gel method and multilayered spiral structures are released by microfabrication technique. Sensitivity analysis of the spiral structure with various layer stack shows that the high displacement of piezoelectric multilayers can be decreased by the application of SiOx layer with compressive stress over the piezoelectric multilayers.
박준협,송지호,Park, Jun-Hyeop,Song, Ji-Ho 대한기계학회 2001 大韓機械學會論文集A Vol.25 No.2
An integrated fatigue strength assessment system was computerized. The system developed consists of 9 modules: user interface, cycle counting, load history construction, data searching, fatigue properties estimation, fatigue data analysis, true stress and strain analysis, expert system for crack initiation life prediction, fatigue crack initiation and propagation life prediction. Fatigue strength database also was included in this system. The fatigue expert system helps a beginner to predict a fatigue crack initiation life in fatigue strength assessment. The expert system module in this system is developed on the personal computer by using C language and UNiK, an expert system developing tool. To evaluate the system, the results of test under variable loading of SAE and failure data from a field were analyzed. The evaluation show that the system provided fatigue life prediction within 3-scatter band and gave reasonable predictions. To get more accurate predictions of fatigue life without fatigue properties, we recommend utilizing the system along with the fatigue strength database.
박준협,이두형 대한구강악안면임플란트학회 2022 대한구강악안면임프란트학회지 Vol.26 No.2
A 35-year-old man with left unilateral cleft palate visited our hospital for prosthetic treatment. After the existing maxillary 10-unit fixed prosthesis was removed, the severely carious teeth were extracted, and the remaining teeth were re-evaluated. Because the periodontal support of the anterior teeth was insufficient due to severe alveolar bone resorption, two additional implants were placed in the positions of the right and left canines, and a tooth-implant-supported hybrid telescopic double-crown-retained denture with friction pins was fabricated as the definitive prosthesis. Although the opposing dental arch comprised natural teeth and fixed prostheses, the patient adapted well to the new prosthesis and was satisfied with its function, esthetics, and ease of maintenance.