혼합감도 평가함수 H∞놈 최소화-다항식 접근방법

安鎬均,宋大原,朴勝圭 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1

The Grimble's polynomial approach in the design of H∞ robust controller is applicable to adaptive control system But it can not minimize the mixed sensitivity cost function. In this paper, In this paper, we use the Youla type of controller and make it possible to minimize the mixed sensitivity cost function by using polynomial approach.

마이크로프로세서를 이용한 UTILITY CAR용 CONTROLLER 개발에 관한 연구

안호균,남징락,김태엽 國立 昌原大學校 産業技術硏究所 1999 産技硏論文集 Vol.13 No.-

This paper describes the development of Controller for the Utility Car using Microprocessor. The Utility Car is composed of Controller, separately excited DC motor, battery and potbox. It is easier for a digitalized controller using microprocessor to append new function than an analogized controller. For sensorless current control, the driver is used the feedback voltage of battery.

시변스위칭함수를 이용한 슬라이딩 모드 제어기의 도달기간 제거에 관한 연구

안호균,곽군평 國立 昌原大學校 産業技術硏究所 1998 産技硏論文集 Vol.12 No.-

This paper presents the design of sliding mode Controller for removing reaching phase using time varying switching functions. For removing reaching phase in VSCS (Variable Structure Control Systems), a time varying switching surface is proposed to achieve the sliding mode during the entire control process. Numerical example is presented to demonstrate the effects of this approach.

천마 (天麻)의 4-Vessel Occlusion으로 유발한 흰쥐 전뇌허혈에 대한 신경보호 효과

金護哲,安德均 대한본초학회 1999 大韓本草學會誌 Vol.14 No.1

Gastrodiae Rhizoma(GR), the rhizoma of Gastrodia elata B₁, has been used for the effect of calming the liver(平?) in Traditional Korean Medicine. We hypothesized this effect of calming the liver has relations with the effects of curing stroke. So, this study was planned to check the neuroprotective effect of GR on the global ischemia induced by 4-vessel occlusion in Wister rats. GR extract was lyophilized with ethanol after reflux extraction with water. We induced 4-vessel occlusion for 10 minutes and reperfused again. The number of CA₁ pyramidal neruons were counted after 7 days of reperfusion under the cresyl violet staining. The result showed significant protective effects of samples compared with control group which was administrated with normal saline in the intraperitoneal injection of 1200㎎/㎏ and 600㎎/㎏ of Gastrodiae Rhizoma extracts at 0, 2 and 6 hours after inducing cerebral ischemia. We also observed the same results when it was injected at 30 minutes before inducing ischemia. The extract of GR did not lower body temperature at these dosages. Further study will be needed to separate the active ingredients of GR and study molecular biological mechanism for developing neuroprotective drug.

발산풍열약(發散風熱藥)의 항고혈압작용에 관한 연구

金護哲,朴珠瑛,安德均 대한본초학회 1999 大韓本草學會誌 Vol.14 No.1

Balsanpungyeolyak, Expelling Pathogenic Wind-Heat Drug, have been used to treat the symptoms such as fever, headache, neck stiffness and skin disturbance which are commonly shown in systemic fever disease like influenza. We thought that the symptoms from the actions of wind and heat in Traditional Korean Medicine are similar to the ones of hypertensive patients in clinic. We chose five drugs among expelling pathogenic wind-heat drugs, Puerariae Radix, Chrysanthemi Flos, Menthae Herba, Mori Folium, and Arctii Fructus, to investigate their antihypertensive effects on S.H.R. and normotensive S.D rats, direct relaxant activity on isolated rabbit aorta, and ACE inhibitory activity. Menthae Herba and Arctii Fructus decreased blood pressure significantly in SHR, but not in normotensive rats, Direct vasodilatative effects on isolated rabbit aorta was not observed in any group. Chrysanthemi Flos, Menthae Herba, Mori Folium, and Arctii Fructus inhibited the actions of ACE dose-dependently. Therefore it is concluded that expelling pathogenic wind-heat drugs has not direct correlation with antihypertensive activity. However, it can be suspected that some drugs for dispersing the actions of wind and heat may regulate blood pressure through ACE inhibition and further study will be helpful to understand the mechanism.

채터링 제거를 위한 유도 전동기의 슬라이딩 모드 제어기 설계

郭君平,安鎬均,金星邑 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1

본 논문에서는 유도 전동기의 슬라이딩 모드 제어기가 설계되었다. 슬라이딩 모드 제어기의 단점인 채터링 현상을 제거하기 위해 연속치 제어입력이 제안되었으며 제안된 기법으로 고속 마이크로 프로세서인 DSP를 이용한 유도전동기의 속도제어를 보였다. 슬라이딩 모드하에서의 유도 전동기는 전동기의 각속도가 지정된 궤적을 추종하도록 동작한다. 실험 결과를 통해 제안된 방법의 유용성을 보였다. This paper presents an improved sliding mode controller design for induction motor. In place of the discontinuous control inputs. continuous inputs are proposed in order to remove the undesirable chattering phenomena. which represent major drawbacks of the sliding mode controller. The design strategy is illustrated with a microprocessor based implementation for the velocity control of an induction motor. An induction motor is operated under sliding mode control such that the motor angular velocity follows a predetermined trajectory. The experimental results confirm the validity of the proposed method.

巴豆가 흰쥐 흉부대동맥 혈관수축에 미치는 영향

朴完洙,金亨煥,安德均,崔湖榮 대한본초학회 2002 大韓本草學會誌 Vol.17 No.2

Objectives : We have examined the vasoconstriction response to the various extracts of Crotonis Fructus (CF, Seed of Croton tiglium L.), defatted CF (DCF), roasted CF (RCF), and Croton oil in rat isolated thoracic aorta. Methods : We have examined the thoracic aorta segments obtained from rats immediately after delivery were mounted in organ baths superfused on a polygraph. Results : We found that the thoracic aorta segments responded to various extracts of CF with a dose-dependent vasoconstriction. In comparison to the 100 mM KCl induced contraction, it was contracted by 150% (water extract of CF), 144.5% (70% ethanol extract of CF), 80.1% (water extract of DCF) and 96.6% (ethanol extract of DCF) after addition of the 3 mg/ml each extract. The thoracic aorta segments were contracted by 118.5% (0.01 mg/ml Croton oil), 133.8% (3 mg/ml RCF for 10min), 123.1% (20min), 117.8% (30min), and 103.9% (40min). Conclusions : In the conclusion, CF, DCF, and RCF induced dose-dependent contraction in the isolated rat thoracic aorta. And it's major component, Croton oil, has potent vasoconstriction effect.

當歸類가 혈관신생에 미치는 영향에 대한 비교연구

吳霞植,金亨煥,安德均,崔湖榮 대한본초학회 2001 大韓本草學會誌 Vol.16 No.2

A rat sponge implant model was used to examine the angiogenic effect of water extract of Angelica Gigantis Radix (EAG). Angelica Sinensis Radix (EAS) and Angelica Radix (EAA). It was based on subcutaneous implantation of sterile polyester sponges in the Sprague Dawley (SD) rat and we have characterized a dye method that incorporates 5% carmine red in 10% gelatin. Vascularity index (V.I.) expressed as ㎍ dye/㎎ dry tissue. The result of study is as follows; 1. Subcutaneous implantation of sterile polyester sponges in SD rats enhanced the angiogenesis over 14 days, as determined by measurements of relative angiogenic effects by a vascularity index. 2. Daily oral administration (100 ㎎/㎏ for 14 days) of EAS and EAA produced weak effect on sponge-induced angiogenesis but EAG caused intense neovasculalization. 3. PBS (50 μ1) and EAG (100 ㎎/㎏) - induced angiogenesis represents a special form of angiogenesis. 4. The vasoconstrictor peptidem, angiotensin Ⅱ(AⅡ), in daily doses of 100 nmol, caused an intense neovascularization and coadministration of the AⅡ (100 nmol) and EAG (100 ㎎/㎏), AⅡ and EAS (100 ㎎/㎏) and AⅡ and EAA (100 ㎎/㎏) produced angiogenic effect. Especially, AⅡ (100 nmol) and EAG (100 ㎎/㎏) caused very potent angiogenesis. We have shown that oral administration of EAG (100 ㎎/㎏) induced angiogenesis. Thus the sponge model offers a new means for continuous and reproducible studies on the controlling mechanisms of angiogenesis.

가시오가피의 부위별 물 추출물이 흰쥐의 혈관이완반응에 미치는 영향

姜奉錫,金亨煥,安德均,崔湖榮 대한본초학회 2001 大韓本草學會誌 Vol.16 No.2

In this study we have examined the actions of water extract of Eleutherococus senticosus (Rupr. et Maxim.) Maxim. (ESH), Stem, Root bark (RB) and Root xylem (RX) in isolated thoracic and abdominal aorta assay. To compare the vasodilation effect, put. ESH, Stem, RB and RX into them which vessels were precontracted by 5-hydroxytryptamine (5-HT). We found out the thoracic aorta segments were responded to ESH with a dose-dependent vasodilation. The 5-HT induced contraction at 10-4M were relaxed after addition of the 2.0 ㎎/㎖ ESH as 32.1% (Stem), 34.9% (RX) and 87.2% (RB). The 5-HT induced vasocontraction at 10^-4M were vasodilated such as 87.2% in thoracic aorta and 89.0% in abdominal aorta with 2.0㎎/㎖ ESH. Addition of 2.0㎎/㎖ ESH in thoracic aorta which was precontracted by the 5-HT at 10-4M were come out differently 0% (water fraction), 53.8% (butanol fraction) and 96.6% (ethyl acetate fraction). The 5-HT induced contraction at 10-4M with and without endothelium were inhibited by 87.2% and 87.8% after addition of the ESH (2.0 ㎎/㎖). In conclusion, ESH-induced relaxation in the isolated rat thoracic aorta and abdominal aorta were come out be dose-dependent relaxation, and ESH's ethyl acetate fraction was showed the potent vasodilation effect.

가변구조제어를 이용한 대체에너지용 인버터 시스템

朴勝圭,金兌燁,安鎬均 창원대학교 공작기계기술연구센터 1999 연구업적집 Vol.1 No.1

This paper proposes the instantaneous control method, structure and characteristics of inverter system for alternative energy. The variable structure control and adaptive parameter estimation is applied to this system. which realizes following function; ① the synchronization of phase, frequency and amplitude between inverter voltage and utility voltage at stand-alone mode ② the synchronization of phase between inverter current and utility voltage at utility voltage at utility interactive-mode. To reduce chattering problem of variable structure control smooth function is used. The result of simulation and experiment shows the effectiveness of proposed control scheme and equivalent circuit; the good performance, robustness of the proposed control structure. and the reduction of THD in the inverter output.