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상황인지 커뮤니티 컴퓨팅을 위한 u-Zone 네트워크 기술
김용혁,김영한 에스케이텔레콤 (주) 2009 Telecommunications Review Vol.19 No.6
상황인지 커뮤니티 컴퓨팅은 사용자가 요구하는 특정 목적을 달성하기 위해 컴퓨팅 객체들이 협업 조직인 커뮤니 티를 구성하여 상호 상황정보를 공유하는 동시에 상황정보에 따른 협업 역할을 맡아 수행함으로 목적을 달성한다. 이 와 같은 상황인지 커뮤니티 컴퓨팅을 위한 네트워크는 상황정보의 실시간적 전송, 커뮤니티 멤버간 자가 네트워크 구 성 및 목적 기반 네트워킹 등의 요구를 만족해야 한다. 이와 같은 요구들 각각에 만족하는 기존 네트워크 기술로서 에 드혹 기술 및 서비스 인지형 네트워킹 기술, Qo S 전송 기술 등이 존재한다. 그러나 이러한 요소 기술이 융합되어 상황 인지 커뮤니티 컴퓨팅의 전반적 목적에 부합하는 네트워크 기술은 부재한 상황이다. 이에 본 논문에서는 상황인지 커 뮤니티 네트워크 구성을 위한 u-Zone(Ubiquitous-Zone) 네트워크를 제안한다. u-Zone 네트워크 기술은 에드혹 네 트워크 기술을 기반으로 한 객체간 자가 네트워크 구성 기능을 기본으로 하고 커뮤니티별 차등화 전송, 컨텍스트 인지 형 라우팅 기술, 커뮤니티 오버레이 네트워크 구성 기능 등이 종합적으로 융합되어 있는 기술로서 상황인지 커뮤니티 컴퓨팅의 요구에 만족하는 네트워크 인프라 구성방법을 제공한다.
유니몰프 압전소자를 이용한 발전 판넬의 출력특성에 관한 연구
김용혁,Kim, Yong-Hyuk 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.3
The ability for energy harvesting via the piezoelectric effect was studied for a unimorph element such as piezo buzzer. A simple equivalent circuit was proposed to predict the energy generated based on the internal stress. Unimorphs with a metal-cavity were used as a driving device of the generation panel. Both the AC open voltage and DC output voltage as a function of pressure period and number of element were measured. For the unimorph generation circuit, DC output voltage varies with pressure period, reaching a maximum value at $470{\mu}F$. The maximum output voltage a according to load resistance was measured at $1M{\Omega}$. Data analysis of the DC output voltage and time constant indicated that number of piezoelectric element of optimum was 60~80. It was found that piezoelectric unimorph has the possibility to be used as the driving element of the electric generation.
Al/Air 연료전지의 출력특성에 미치는 KOH 전해질과 H<sub>2</sub>O<sub>2</sub> 감극제의 영향
김용혁,Kim, Yong-Hyuk 대한전기학회 2015 전기학회논문지 P Vol.64 No.4
The effects of additive such as $H_2O_2$ in KOH electrolyte solution for the Aluminum/Air fuel cell were investigated with regard to electric power characteristics. The power generated by a Al/Air fuel cell was controlled by the KOH electrolyte solution and $H_2O_2$ depolarizer. Higher cell power was achieved when higher KOH electrolyte concentration and higher $H_2O_2$ depolarizer amount. The maximum power was increased by the increase amount $H_2O_2$ depolarizer, it was found that $H_2O_2$ depolarizer inhibits the generation of hydrogen and the polarization effect was reduced as a result. Internal resistance analysis was employed to elucidate the maximum power variation. Higher internal resistance created internal potential differences that drive current dissipating energy. In order to improve the output characteristics of the Al/Air fuel cell, it is thought to be desirable to increase the KOH electrolyte concentration and increase the $H_2O_2$ addition amounts.
Beta Adrenergic Blocking Agent, Sotalol (MJ 1999)이 Cyclopropane-Epinephrine 心不整脈에 미치는 影響
金湧赫,辛正順 고려대학교 의과대학 1975 고려대 의대 잡지 Vol.12 No.3
It has been shown that beta-adrenergic blocking agents dibenamine, propranolol and pronethalol significantly raise cyclopropane-epinephrine arrhythmia threshold and concluded that myocardial ectopic excitation might be attributable to the beta-adrenergic receptors. These beta-adrenergic blocking agents, however, have pharmacologic properties other than beta-adrenergic blockade, e. g., local anesthetic and/or quinidine-like effects, which might have contributed to the anti-arrhythmic properties observed. It is the author's intention to search for the cause of arrhythmia using more selective beta-adrenergic blocker, Sotalol(MJ 1999). Twenty-four mongrel dogs were anesthetized with 25% cyclopropane in semiclosed circle absorption system endotracheally and cyclopropane-epinephrine arrhythmias thresholds with or without pretreatment with Sotalol were determined. The results were continuously recorded on Beckman RM 4-channel recorder. Ventilation was adjusted so that the pH and Pco₂were in the range of 7.35-7.45 and 30-35㎜ Hg, respectively. The results were as follows: 1. The ocurrence of cardiac arrhythmias were not necessarily related to changes in blood pressure. 2. Sotalol decreased both blood pressure and heart rate, potentiated the pressor effect of epinephrine, reduced tachycardia produced by epinephrine, and increase the threshold of arrhythmia threshold by 8 to 16 times. 3. These results suggest that cyclopropane-epinephrine cardiac arrhythmias are caused by stimulation of beta-adrenergic receptors in the heart.