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정전방사에 의한 PAN계 활성화 탄소 나노섬유 전극 제조와 EDLC 응용
김찬,김종상,이완진,김형섭,양갑승,Kim, Chan,Kim, Jong-Sang,Lee, Wan-Jin,Kim, Hyung-Sup,Edie, Dan D.,Yang, Kap-Seung 한국전기화학회 2002 한국전기화학회지 Vol.5 No.3
PAN(polyacrylonitrile)을 DMF(dimethylformamide) 용매에 용해하여 정전방사법에 의해 평균 직경 400 nm의 나노섬유 웹을 제조하였다. 제조된 나노섬유 웹은 산화 안정화, 활성화 공정을 거쳐 활성화 탄소 나노섬유를 제조하여, 전기화학적 특성과 비축전 용량을 측73하였다. 활성화 탄소 나노섬유의 비표면적은 $1230m^2/g-800m^2/g$으로 일반 활성탄소 섬유의 거동과는 다르게 활성화 온도가 증가할수록 감소하는 경향을 나타냈으며, 활성화 에너지 값은 29.2kJ/mol로 활성화 온도에 크게 영향을 받지 않고, 급격한 반응이 일어남을 알 수 있었다. 비축전 용량은 활성화 온도가 $700^{\circ}C,\;750^{\circ}C,\;800^{\circ}C$의 경우 27 F/g, 25 F/g, 22 F/g으로 활성화 온도가 증가할수록 비표면적에 비례하여 낮아지는 경향을 나타냈다. Poly(acrylonitrile)(PAN) solutions in dimethylformamide(DMF) were electrospun to prepare webs consisting of 400nm ultra-fine fibers. The webs were oxidatively stabilized, activated by steam and resulted to be activated carbon fibers(ACFs). The specific surface area was $800\~1230 m^2/g$, which showed a trend of a decrease of the surface area with an increase in activation temperature, showing opposite behavior to the other ACFs. The activation energy of the stabilized fibers for the steam activation was determined as 29.2 kJ/mol to be relatively low indicating the easier activation than that of other carbonized fibers. The ACF webs were characterized by pore size and specific surface uea which would be related to the specific capacitance of the electrical double layer capacitor (EDLC). The specific capacitances measured were 27 F/g, 25 F/g, 22 F/g at the respective activation temperature of $700^{circ}C,\;750^{\circ}C\;800^{\circ}C$, showing similar trend with the specific surface area i.e., the higher activation temperature was, the lower specific capacitance resulted.
김찬,배익현,서영민,장석주 대한성형외과학회 2002 Archives of Plastic Surgery Vol.29 No.3
Malignant hyperthermia is an inherited disorder of skeletal muscle, characterized by temperature elevation, muscle destruction, muscle rigidity and high oxygen consumption. It is triggered by anesthetic agents, usually potent inhalation anesthetics and succinylcholine. It is fatal in the majority of cases unless early diagnosis and treatment are performed.We experienced one case of malignant hyperthermia incidentally. She had post burn scar contracture on anterior chest and abdomen and local flap was prepared for releasing scar contracture under general anesthesia. Approximately 3 hours after induction, tachycardia developed followed by severe arrhythmia with unstable blood pressure, temperature elevation and cyanosis. Anesthesia was stopped immediately and aggressive emergency management was performed with Dantrolene. About 4 hours after induction, the patient was recovered to normal state with intensive care.
김찬,정승문 대한성형외과학회 2002 Archives of Plastic Surgery Vol.29 No.6
Frontal sinus osteoma is one of the rare diseases and is diagnosed incidentally by skull X-ray. After the disease is confirmed, long term follow-up is necessary.The etiology of the disease is usually unknown and almost all of the patients has any kind of symptoms or signs. The most of the symptoms of this disease are pain, headache, swelling and lagophthalmos. Frontal sinus osteoma has characteristic features such as radiopaque, mass like lesion in the frontal sinus. Operation of the frontal sinus osteoma is not necessary unless it has symptoms or infection sign. We experienced one case and operated the osteoma and reconstructed frontal sinus by cranialization and bihalving calvarial bone graft. The result is satisfactory without complication.
Gultamate 및 Kainate에 의하여 유발된 흰쥐척수후각세포 반응에 미치는 칼슘의 효과
김찬,신홍기,안현정,강석한 한양대학교 의과대학 1998 한양의대 학술지 Vol.18 No.1
Excitatory amino acids have been known to play an important role in the transmission of nociceptive signals in the spinal cord. The present study was undertaken to examine the effects of changes in calcium ion concentration on the responses of spinal dorsal horn neurons to EAAs. At first, the responses of LT (low threshould) and WDR (wide dynamic range) cells to iontophoretically applied glutamate and kainate were recorded before and during iontophoretic application of Ca^2+, Mn^2+ and EGTA. And the changes in spontaneous activity of the WDR cells were observed following iontophoretic application of Ca^2+, Mn^2+, EGTA and verapamil. Also studied was the effect of prolonged spinal application of EGTA on the glutamate - induced responses of the WDR cells. The spontaneous activity of WDR cells was strongly inhibited by iontophoretically applied Ca^2+, Mn^2+, and verapamil but greatly augmented by EGTA. The iontophoretically applied kainate produced excitation of all the LT and WDR cells whereas glutamate evoked excitation of all WDR cells and approximately 50% of LT cells. The responses of LT and WDR cells to glutamate and kainate were dose-dependently suppressed by Mn^2+ and Ca^2+ + but augmented by iontophoretically applied EGTA. The EGTA - augmented responses were reduced by Ca^2+ and Mn^2+. However, the response of WDR cell to glutamate was suppressed after a prolonged (15-20min) spinal application of EGTA. These experimental findings suggest that in the spinal cord, excitatory amino acids excite LT as well as WDR cells and that the transmission of EAA-induced sensory singals is modulated by the changes in calcium ion concentration.
김찬,김중호 대한마취과학회 1989 Korean Journal of Anesthesiology Vol.22 No.5
Authors have experienced a case of unilateral blindness which occurred after general anesthesia. A 17 year sold male patient underwent right CC, hemilaminectomy and traumatic pseudomeningocele aspiration under Halothane general anesthesia in prone position on December 17th, 1987. On regaining conciousness, he complained of loss of vision. At initial examination, the affected eye was blind and the opposite eye was normal except loss of indirect light reflex. There was complete drooping of eyelid and loss of ocular movements. The right pupil was markedly dilated and direct light relfex was abscent. Examination of the retina revealed milky edema and cherry-red spot at the macula. There was a permanent loss of vision on the affected eye.