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박소영(So-Young Park),이상호(Sang-Ho Lee),권대성(Dae-Sung Kwon) 한국정보과학회 2002 정보과학회논문지 : 시스템 및 이론 Vol.29 No.3·4
비밀분산법이란 하나의 비밀정보를 다수의 비밀조각으로 분할하여 다수의 신뢰할 수 있는 사람들에게 공유시킴으로써 비밀정보를 안전하게 유지 · 관리하는 암호학적 방법이다. 그러나 비밀정보를 공유하는 참가자들이 비밀정보 복원에 대해 서로 다른 권한을 가지고 있을 경우, 이러한 참가자들간의 계층 구조를 반영할 수 있는 비밀분산법의 설계가 필요하다. 각 참가자들이 갖는 비밀정보에 대한 복원 권한을 가중치로 표현함으로써 가중치에 따른 비밀정보 공유 및 복원이 가능한 가중치를 갖는 비밀분산법을 제안한다. A secret sharing scheme is a kind of cryptographic protocol to maintain secret information by splitting it to many small pieces of shares and sharing between shareholders. In case of shareholders having different authorization to reconstruct the original secret, it is required a new secret sharing scheme to reflect any hierarchical structure between shareholders. In this paper, we propose a new weighted secret sharing scheme, that is, each shareholder has a weight according to the authorization of reconstructing the secret and an access set which is a subset of shareholders can reconstruct the secret if the sum of weights is equal or greater than a predefined threshold.
소아의 뇌종양 제거술 중 저칼륨혈증에 의한 심정지 1예
권대성,정순호,최영균,김영재,박진우,신치만,박주열 인제대학교 1997 仁濟醫學 Vol.18 No.1
심폐 소생술 중 칼슘의 투여는 재관류 손상(reperfusion injury)을 조장하며 특히 성인의 경우에 전신마취하에서는 심근의 흥분성을 증가시켜 부정맥을 유발할 가능성이 있다고 하여 사용을 기피하는 경향이 있다. 저자들은 소아에서 전신 마취하에 뇌종양 제거술중 발생한 심정지의 심폐 소생술에서 칼슘의 투여 후 활력징후가 회복된 1예를 경험하고 문헌 고찰과 함께 보고하는 바이다. There are controversies in calcium adminstration during cardiopulmonary resuscitation. Calcium can induce reperfusion injury and it can increase cardiac irritability which results in arrhythmias. But in the case of pediatric cardiac arrest. calcium does not increase cardiac irritability and calcium adminstration is relatively safe. A 4-year old male child underwent removal of brain tumor under general anesthesia. During operation, cardiac arrest was developed and did not respond to cardiac massage, cardioversion, epinephrine, etc. Arterial blood gas analysis showed severe hypocalcemia and hyperkalemia during cardiac arrest. After infusion of CaCl2, circulation was restored and vital signs returned to normal. We concluded that calcium should be administered to increase cardiac responsiveness in a case of hypocalcemia combined with hyperkalemia during pediatric cardiopulmonary resuscitation.
Diazepam 투여시 진정정도에 따른 Long Latency Auditory Evoked Potentials 의 P300의 변화
김영재,박진우,김정환,박주열,신치만,최영균,정순호,권대성,임재중 대한마취과학회 1997 Korean Journal of Anesthesiology Vol.33 No.2
Background : P300 component of the long latency auditory evoked potentials(LLAEPs) provides information on conscious and cortical funtion. The P300 wave occures only for stimuli that somehow capture the patients attention. Therefore LLAEPs implys a degree of cognitive processing. We studied sedation scale and P300 wave to determine if LLAEPs could be utilized as electrophysiologic predictors of sedation. Methods : The P300 component of LLAEPs from vertex was recorded from 10 ASA physical status I and II patients undergoing elective surgery while they listened via headphones to a series of clicks which were interrupted unpredictably by a tone burst(2 KHz) before and after diazepam 0.04 mg/kg and 0.08 mg/kg IV. The patients were asked to concentrate on the clicks and to press a button whenever they detected a 2 KHz tone. And sedation scale also was measured. Results : Amplitude of P300 was decreased and latency of P300 was increased in a dose-dependent manner with IV diazepam. Amplitude was greatest and latency was shortest in awake. And sedation scale also was increased according to increased IV diazepam adminstration. Conclusions : Both amplitude and latency may be highly related to the sedation scale with progressively increasing dose of diazepam. Therefore we conclude that P300 component of LLAEPs can be utilized as an electrophysiologic predictor of awareness and sedation. (Korean J Anesthesiol 1997; 33: 248∼253)