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류철희,Hwang Wonseop,Cho Jae Yong,Kim Se Bin,김경범,Song Yewon,Sung Tae Hyun 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.76 No.10
In the field of piezoelectric energy harvesting, a cantilever is widely used in a piezoelectric energy harvester (PEH) because it easily deforms under various forces and, generally, the output of the cantilever increases proportionally with the deformation. Naturally, many previous studies focused on how to obtain a higher PEH output. However, the power of the input source is limited, so the efficiency of the PEH must be maximized. In this study, based on the amount of input energy, the existence of an optimal efficiency of energy conversion in the PEH was researched. A plate-type PEH was first installed as the cantilever, and various masses were suspended from the free end of the PEH by using a thread. Next, the thread was cut while the PEH was in a bending state. Immediately, the PEH began vibrating with the input energy being the potential energy of the bent PEH, and the output was obtained. A maximum efficiency of 15.58% was determined in three ways: via the output electrical energy (0.46 mJ), the input potential energy (2.94 mJ), and the deflection value (at a free end position of 3.75 mm). Finally, the existence of the optimal efficiency based on the amount of input energy was found in this PEH.
생쥐 난자의 체외 성숙과 수정에 있어서 난구 세포의 역할에 관한 연구
이희섭,류철희,이기숙,오병찬,조성남,진소자,두재균,김관식,김종덕 의과학연구소 1996 全北醫大論文集 Vol.20 No.2
The time course and conditions encessary for oocyte maturation and the role of cumulus cells on fertilization in vitro were studied in the mouse. nuclear maturation of cultured oocytes was evaluated by analyzing chromosomal configurations. Isolated oocytes from cumulus-oocyte complex were matured spontaneously in vitro, nad 81% of oocytes developed to the metaphase Ⅱafter 24 horus inculbation. Cumulus-oocyte complex matured in vitro, and 865 of those developed to the metaphase Ⅱ agter 24 hours. The fertilization frequency of isolated oocytes in hyaluronidase was similar in both +HCG and -HCG culture meticum(29.2% and 21.7%, respecitvely). However the fretilization frequency of cumulus-oocyte complex was greater than that of isolated oocytes, and the fertilization frequency of cumulus-oocyte complex cultrued in +HCG culture meticum was lower than that cultrued in -HCG culture meticum(36.4% and 58%, respectively). It is concluded that frequency of spontaneous maturation of isolated oocyte was similar to that of cumulus-oocyte complex, and that the presence of cumulus cells during fertilization may affect the oocyte's ferilization.