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Active Vibration Control Method Using Frequency Controllable Piezoelectric Transducer
김정순,김무준,하강렬,강성학,Kim, Jung-Soon,Kim, Moo-Joon,Ha, Kang-Lyeol,Kang, Sung-Hak The Acoustical Society of Korea 2007 韓國音響學會誌 Vol.26 No.e1
Hydraulic actuator and electro-magnetic liner actuator have been used as typical active vibration control methods. However these methods have many kinds of disadvantages such as causing space limit, difficult maintenance, complicate structures, etc. The purpose of this paper was to study on the possibility of active vibration control using piezoelectric transducer. Piezoelectric transducer generated a vibration and GIC (General Impedance Converter) amplifier was adopted to give adjustable vibration signal to transducer and high amplitude of vibration. Resonance frequency of piezoelectric transducer was controlled by GIC amplifier and higher amplitude of vibration was achieved. Finally active vibration control using piezoelectric transducer was performed.
정현주 ( Hyun Ju Jung ),강성학 ( Sung Hak Kang ),임경실 ( Kyung Sil Im ),이재명 ( Jae Myeong Lee ),김대영 ( Dae Young Kim ),홍상현 ( Sang Hyun Hong ),김종분 ( Jong Bun Kim ) 대한마취과학회 2006 Korean Journal of Anesthesiology Vol.51 No.4
One of the most fearful rare complication of ureteroscopic lithotripsy is sepsis. Since sepsis after endourological maneuvers usually occur immediately after procedure, it is important to pay attention to symptoms representing sepsis such as pyrexia, tachycardia, tachypnea, and oliguria. In addition to clinical symptoms, laboratory tests including white blood cell (WBC) count, C-reactive protein (CRP), erythrocyte sedimentation rate (ESR), and urine and blood cultivating can help to diagnosis of sepsis. We present a case of shock after ureteroscopic lithotripsy, which was suspected with septic shock strongly. (Korean J Anesthesiol 2006; 51: 508~11)