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유연 매체에 적용 가능한 Bimorph PZT 구동기의 설계 및 제어
심현재 ( H. J. Shim ),황현우 ( H. W. Hwnag ),박노철 ( N. C. Park ),양현석 ( H. S. Yang ),박영필 ( Y. P. Park ) 정보저장시스템학회 2005 추계학술대회논문집 Vol.2005 No.-
Nowadays, various approaches are performed to increase the storage capacity of optical storage device. One of the promising candidates is using the high NA lens. By using high NA lens, the beam spot size can be reduced which will lead to increase the storage density. This paper proposes a double cantilever beam type bimorph PZT actuator for fine motion that can control the gap between the flexible media and optical pickup which uses high NA lens. Mathematical model is derived by using Hamilton``s principle and the model is verified by finite element analysis and experiment. Position controller is designed and its performance is evaluated by experiment.
김태은,김종태,심현재,이훈연,김성오,김동근,조미나,이소진,전용덕,송영재,진종식,조용진 한국식품과학회 2020 Food Science and Biotechnology Vol.29 No.9
To improve the industrial use of health-functionalmaterials based on edible insects, the objective ofthis study was to establish optimal conditions for improvingthe quality of Protaetia brevitarsis seulensis larval(PBSL) hydrolysates. PBSL was extracted using fourmethodologies: atmospheric pressure 50 C-water extraction,atmospheric pressure 95 C-water extraction, atmosphericpressure 50 C-water enzymatic hydrolysis, andenzyme treatment under high pressure (HPE). The qualitycharacteristics of soluble solid content, extraction yield,total protein content, protein yield, protein content withlow molecular weight (LMW) (\1kD), and the amino acidcomposition of hydrolysates were compared based on thedifferent methods. All of the quality characteristics werefound to be higher for HPE extracts than for the otherextracts. Under optimized HPE conditions, extractionyield, protein yield, protein content with LMW, amino acidcontent and the content of essential amino acids increased by 3.4, 4.4 1.4 1.5, and 1.3 times respectively, compared tothe other methods.