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안정환,우민식,송다니엘,Seong Kwang,Ki Hwan Baek,황성주,성태현 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.11
Two models were developed a pre-stress model and a no-pre-stress model for considering the effectsof a tip mass with and without pre-stress induced by gravity, respectively. Three tip masses−6,18, and 30 g−were used in experiments, and four cases were considered: the above three tip massesand a 0 g case, corresponding to no tip mass. Two prominent effects of the tip mass were theoreticallypredicted and experimentally verified. We established an evaluation standard and ananalysis technique for efficiently analyzing these two effects of the tip mass on the output power ofa piezoelectric energy-harvesting system. For both models, a higher output power was obtained ina system with a tip mass than in a system without a tip mass. Results of the experiments and of acritical voltage analysis demonstrated that the developed tip mass method successfully augmentedthe output power of the system.
대요근 근구 차단술 시행 후 발생한 요근 농양의 경험예 증례 보고
안정환,김용철,이상철,이영선 대한통증학회 2004 The Korean Journal of Pain Vol.17 No.2
Psoas compartment block (PCB) has been used for thigh, leg and lumbar area pain. It is now known to be safe and available to advocate for patients with lower extremity pain. Psoas compartment block was performed for the treatment of the lower extremity pain in a 61-year-old woman, complaining of sudden left thigh and inguinal pain. One day after the PCB, her body temperature was elevated and the leg pain aggravated by adduction of the left femur, suggestive of a psoas abscess. A huge abscess was found in the psoas major muscle on the immediate magnetic resonance image (MRI), and empirical antibiotics were administered. After a month, her left leg pain had subsided, and an MRI showed a diminished abscess pocket. Immediate laboratory check up and radiological examination are recommended for patients with fever and pain after blocks.