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林廷圭,李容재,李恒振,金東秀,宋雄奎,金暎洙,趙奐九 中央醫學社 1963 中央醫學 Vol.4 No.6
The change of serum cholesterol level in fasting rabbits induced by the oral administration of Deer Horn (cervus unicolor) decoction were colorimetrically determined. Increase in seruem cholesterol level resulting from fasting was lowerd by the decoction, although the action was relatively slow. The deer horn decoction was supprsed to prevent the reduced lover function of the rabbits under the fasting state.
TMS320F2812 DSP와 스마트 파워모듈을 사용한 유도전동기 소형 벡터제어 시스템의 구현
임정규(Jeong-Gyu Lim),김석환(Seok-Hwan Kim),정세교(Se-Kyo Chung) 전력전자학회 2004 전력전자학술대회 논문집 Vol.- No.-
This paper presents an implementation of compact vector control system for induction motor using a digital signal processor (DSP) and a smart power module (SPM). The DSP TMS320F2812 has most necessary functions for ac motor control in a single chip and SPM provides a compact power stage. The indirect vector control algorithm is implemented in the drive system using these devices. The developed system is applied by 0.8㎾ induction servo motor and the all functions are verified through the experiments.
위상천이 풀-브릿지 PWM 컨버터의 이산 시간 모델링 및 제어기 설계
임정규(Jeong-Gyu Lim),임수현(Soo-Hyun Lim),정세교(Se-Kyo Chung) 전력전자학회 2007 전력전자학술대회 논문집 Vol.- No.-
A phase shifted full-bridge PWM converter (PSFBC) has been used as the most popular topology for many applications. But, for the reasons of the cost and performance, the control circuits for the PSFBC have generally been implemented using analog circuits. The studies on the digital control of the PSFBC were recently presented. However, they considered only the digital implementation of the analog controller. This paper presents the modeling and design of the digital controller for the PSFBC in the discrete time domain. The discretized PSFBC model is first derived considering the sampling effect. Based on this model, the digital controller is directly designed in discrete time domain. The simulation and experimental results are provided to verify the proposed modeling and controller design.
Intelligent Power Module의 플로팅 게이트 전원 공급을 위한 전하 펌프 회로의 설계
임정규(Jeong-Gyu Lim),김석환(Seok-Hwan Kim),서은경(Eun-kyung Seo),정세교(Se-Kyo Chung) 전력전자학회 2005 전력전자학술대회 논문집 Vol.- No.-
A bootstrap circuit for floating power supply has the advantage of being simple and inexpensive. However, the duty cycle and on-time are limited by the requirement to refresh the charge in the bootstrap capacitor. Hence, this paper deals with a design of charge pump circuit for a floating gate power supply of an IPM. The operation of the proposed circuit applied by three-phase inverter system for driving induction motor are verified through the experiments.
Al-xMg-CNT 복합분말체의 용융특성에 미치는 마그네슘 첨가와 온도의 영향
임정규 ( Jung Kyu Lim ),최경환 ( Kyong Hwan Choe ),김상섭 ( Sang Sub Kim ),조규섭 ( Gue Serb Cho ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.4
We conducted melt-down experiments on Al-xMg-carbon nanotube (CNT) complex powder compacts at 700℃ and 800℃ for carrying the CNTs into the molten Al7021 matrix alloy. The parameters in the melting experiments were the holding temperatures and the amount of Mg content. The microstructures of the melt-down compacts were observed by optical microscopy (OM) and field emission scanning electro-microscopy (FESEM). The several phases obtained from the reaction products within the Al-xMg-CNT compacts were identified by energy dispersive X-ray spectroscopy (EDXS) and X-Ray diffractometry (XRD). The complete melt-down area was increased due to a large addition of Mg in the compacts and outer areas remained as undissolved powder compacts due to the large number of oxidation products such as MgO, MgAl2O4 and Al2O3. CNTs were observed on the surface of Al powders with oxidation products at 700℃ in a melting experiment. However, at 800℃, the CNT agglomerates moved away from the center because of the poor wettability and low density of the CNTs.
Al-CNT 복합펠렛의 계면반응에 미치는 마그네슘 첨가 및 제조 조건의 영향
임정규 ( Jung Kyu Lim ),최순열 ( Soon Yool Choi ),최경환 ( Kyong Hwan Choe ),김상섭 ( Sang Sub Kim ),조규섭 ( Gue Serb Cho ) 대한금속재료학회(구 대한금속학회) 2013 대한금속·재료학회지 Vol.51 No.5
In the present study, Al-CNT pellets were investigated to understand the effect of Mg addition and manufacturing conditions on the interfacial reactions between Al and CNTs in Al-CNT pellets. The pellets were heated and held at 700 ℃ and 800 ℃ for 2 hours under nitrogen (N2) atmosphere. To confirm the reactions between Al and CNT in the pellets under different manufacturing conditions, the microstructures were observed by optical microscopy (OM) and field emission scanning electro microscopy (FESEM). And, the composition and reaction phases were analyzed by energy dispersive X-ray spectroscory (EDXS) and X-ray diffractometry (XRD). The presence of oxidation products and Mg on the surface of Al powder in the pellets appeared to prevent the formation of Al4C3. But, Al4C3 reaction products were increased due to the high temperature of 800 ℃, which produced a high amount of reduced aluminium and increased the reaction areas between Al and CNT. The Al-CNT pellets compacted under air atmosphere prohibited the reaction between Al and CNT because of the high amount of oxidation products, such as MgO and MgAl2O4.
임정규,여인성,이진석,이형진,양지호,이일우 대한뇌혈관외과학회 2010 Journal of Cerebrovascular and Endovascular Neuros Vol.12 No.3
Objective : Previously, we reported that a high lipid diet significantly increases the induction rate of cerebral aneurysm (CA) formation in an experimentally induced CA rat model, suggesting that hypercholesterolemia with chronic inflammation leads to aneurysm formation. To elucidate the role of hypercholesterolemia in CA formation, experimentally induced CA was evaluated in rats fed a high lipid diet and treated with low and high doses of atorvastatin. Methods : Thirty-seven, 7-week-old male Sprague-Dawley rats underwent a CA induction procedure. The control animals (n = 11) were fed a normal diet, and the experimental animals (n = 26) were fed a diet containing high lipid content for 3 months. The experimental group comprised a high-dose atorvastatin group (20 mg/kg/day, n = 15) and low-dose atorvastatin group (1 mg/kg/day, n = 11). Three months after the operation, induction of CA formation in the three groups was analyzed. Results : Induced CA formation was 67%, 63%, and 36% in the control, high lipid/high atovastatin, and high lipid/low atovastatin group, respectively. The differences resulting from high-dose and low-dose atorvastatin were significant (Pearson k2, P = 0.028 and 0.029, respectively). Conclusions : A high lipid diet can significantly increase induction of CA formation. However, the lack of decreased induction in atorvastatin-treated animals suggests that high and low doses of atorvastatin do not inhibit the potential effects of hypercholesterolemia on CA formation. Further studies, such as those utilizing apolipoprotein E knockout mice, are necessary to elucidate the exact role of hypercholesterolemia in the pathophysiology of CA. (Kor J Cerebrovascular Surgery 12(3):196-201, 2010)