• 전기의세계
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• v.46 no.7
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• pp.33-35
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• 1997

본 원고에서는 승압의 배경 및 외국의 승압현황과 경제적 이득, 높은 전압으로 승압에 따른 안전대책, 승압을 추진하면서 발생된 효과 등을 고찰하여 220V 승압사업이 성공적으로 마무리될 수 있는 방향을 제시해 보고자 한다.

• 전기의세계
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• v.27 no.4
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• pp.7-10
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• 1978

우리나라에 전기가 밝혀진지 어언 80년, 그간 공급능력 확충을 위하여 송전전압 및 1차 배전전압의 승압은 이미 시행하여 오고 있으나 2차 배전전압의 승압은 일반가정 전기수용가와 직결됨으로서 가전기기 보상의 어려움등 제반여건불비로 시행치 못하였으나 금반 2차 배전전압 단기승압계획이 정부에 의해 공포되었다. 이 승압사업은 백년대계를 위한 국가적 사업임과 동시 전기혁신적 사업이며 에너지 자원절약면에서나 전기수용가에 대한 서어비스 향상면에서도 그 의의가 있다 하겠다.

• The Science & Technology
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• v.1 no.2 s.2
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• pp.15-23
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• 1968

1. 서 론 2. 제외국의 배전전압승압현황 A. 일차배전전압 B. 이차배전전압 3. 일차배전전압승압의 경제성 A. 전기적특성 B. 경제성 C. 주요기재 4. 이차배전전압승압의 경제성 A. 배전방식별손실비율 B. 전기기기사용면에서의 비율 C. 경제성 5 결 론 A. 일차배전저압 B. 이차배전전압

• The Korean Journal of Physiology
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• v.23 no.1
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• pp.129-138
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• 1989

In an attempt to characterize the ventral root afferent fibers, arterial blood pressure responses to stimulation of the ventral root (VR) were observed in anesthetized cats. Effects of the morphine administered either intravenously or direct spinally and of the spinal lesions on the pressor responses were compared. Followings are the results obtained. 1) Stimulation of the VR with C-strength, high frequency stimuli evoked a marked pressor response. No depressor response, which had been reported during peripheral nerve stimulation, was observed during VR stimulation with low frequency. 2) Acute cervical spinalization abolished the pressor response, indicating the involvement of supraspinal mechanism. 3) The ascending spinal pathways of the pressor response were located in the dorsolateral funiculus bilaterally. 4) Intravenously administered morphine exaggerated the pressor response to VR stimulation, while direct spinally administered morphine suppressed it. From the above results it was concluded that the ventral root afferent fibers have more similar properties to muscular C-afferent fibers than to cutaneous C-fibers.

• Electrical & Electronic Materials
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• v.2 no.2
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• pp.143-151
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• 1989

본 논문은 압전 세라믹스 재료를 사용한 장방형 압전 변압기의 승압특성에 관한 연구이다. 승압기구 분석을 위하여 진동모드에 따른 주파수 Spectrum을 구동부측곽 발전부측에 대해 각각 조사하였다. 시편구조(전극길이, 두께, 폭)에 따른 진동상태와 승압비를 평가하고 압전 변압기로써 가져야 될 최적조건을 제시하였다. 또한 부하저항에 병렬로 연결된 등가손실저항과 발전부 공진임피던스 사이의 관련성을 검토하였다.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.47 no.6
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• pp.13-21
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• 2010

A energy efficient $V_{pp}$ generator using a variable pumping frequency for mobile DRAM is presented in this paper. The proposed $V_{pp}$ generator exploits 3 stages of a cross-coupled charge pump for energy efficiency. Instead of using a fixed pumping frequency in the conventional $V_{pp}$ generator, our proposed $V_{pp}$ generator adopts a voltage-controlled oscillator and uses variable frequencies to reduce the ramp-up time. As a result, our $V_{pp}$ generator generates 3.0 V output voltage with 24.0-${\mu}s$ ramp-up time at 2 mA current load and 1 nF capacitor load with 1.2 V supply voltage. Experimental results show that the proposed $V_{pp}$ generator consumes around 26% less energy (1573 nJ $\rightarrow$ 1162 nJ) and reduces 29% less ramp-up time (33.7-${\mu}s$ $\rightarrow$ 24.0-${\mu}s$) compared to the conventional approach.

• JOURNAL OF ELECTRICAL WORLD
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• no.5 s.41
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• pp.32-36
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• 1980

• The Journal of the Korean life insurance medical association
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• v.1 no.1
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• pp.84-87
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• 1984

1. Effect of bretylium on the pressor response of the whole and spinal rabbits to tyramine was observed in conditions of monoamine oxidase inhibition brought about by catron administration. 2. Bretylium increased the prossor response to tyramine in the whole and spinal rabbits. 3. Bretylium failed to increase the tyramine effect if bretylium was given after administration of catron, a monoamine oxidase inhibitor. Actually the tyramine effect was decreased by bretylium in this situation. 4. The increase of the tyramine effect by bretylium will be due to its monoamine oxidase inhibitory property, and the decrease of the tyramine effect will be due to its adrenergic neurone b1coking property.

• The Korean Journal of Pharmacology
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• v.26 no.2
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• pp.101-111
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• 1990

The effect of physostigmine (PS), which has been shown to act on the muscarinic receptors in the brains of the rat, dog and cat, on the arterial blood pressure (BP) was investigated in urethane-anesthetized rabbits. Intravenous (iv) PS, $25{\sim}300\;{\mu}g/kg$, caused little change in BP. However, after treatment of rabbits with either of chlorisondamine (CS), hexamethonium, intracerebroventricular (icv) clonidine, icv xylazine and icy reserpine iv PS produced a pressor response. Spinalization of the rabbit also caused iv PS to increase BP. The pressor effect of iv PS in CS-treated rabbits was markedly reduced after prazosin or pirenzepine. Iv PS inhibited the pressor response to McN-A-343 in CS-treated and in spinal rabbits; alternately during the infusion of McN-A-343 iv PS failed to produce the pressor response. The pressor response to DMPP was not affected by iv PS. Icv PS, $12{\sim}200\;{\mu}g/kg$, produced a pressor response which was accentuated after CS-treatment. This pressor effect was inhibited, though not complete, by prazosin or by pirenzepine. A simultaneous treatment of rabbits with both $[Sar^{1},\;Ala^{8}]-angiotensin$ II, an angiotensin II antagonist, and prazosin or pirenzepine almost completely abolished the pressor effect of icv PS, whereas the angiotensin II antagonist did not enhance the inhibitory effect of pirenzepine and prazosin on the pressor response to iv PS . Icv pirenzepine blocked the pressor response to icv PS without affecting that to iv PS. The present results show that the pressor response to iv PS in CS-treated and in spinal rabbits arises from stimulation of the muscarinic receptors in the sympathetic ganglia, whereas the pressor response by icv PS via activation of the muscarinic receptors in the brain which causes an enhancement in the outflow of sympathetic discharge and angiotensin. The results also suggest that iv PS is unable to produce a pressor response in the rabbit unless the sensitivity of the gangionic muscarinic receptors is altered by ganglionic nicotinic blockade, by the decrease of central sympathetic outflow on the sympathetic ganglia or by spinalization.

• Journal of the Korean Professional Engineers Association
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• v.26 no.1
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• pp.38-40
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• 1993