• 한국동물학회:학술대회논문집
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• 한국동물학회 2001년도 한국생물과학협회 학술발표대회
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• pp.115.3-116
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• 2001

No Abstract, See Full Text

• 한국고분자학회:학술대회논문집
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• 한국고분자학회 2006년도 IUPAC International Symposium on Advanced Polymers for Emerging Technologies
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• pp.294-294
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• 2006

Diblock copolymers whose morphology in the bulk is dictated by the volume fraction of the components and segmental interactions were confined within nanoscopic cylindrical pores. Since the confining geometry is nonplanar and nanoscopic, the extreme imposed curvature, comparable to molecular dimensions, places significant packing frustration on the chains. When incommensurability between the repeating period of diblock copolymers and the diameter of nanopore is coupled with the curvature, it causes the marked departures from bulk or even thin film behavior. The entropy penalty from the constraints and the curvature of the physical confinement determines unique nanostructures available only with this curved confinement.

• 약학회지
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• 제38권6호
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• pp.786-790
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• 1994

The crude alkaloidal fraction of the root of Cynanchum caudatum Max.(Asclepiadaceae) was tested for the effects on the activities of free radical generating enzymes and the formation of lipid peroxide. Aldehyde oxidase was strongly inhibited to about 90% of the activity by treating 1.0 mg/ml of alkaloidal fraction, corresponding to competitive inhibition. Moreover, the formation of lipid peroxide which causes damage of cell membrane was reduced in proportion to the increasing alkaloid concentration. However, xanthine oxidase of which structure and function are similar to those of aldehyde oxidase was not inhibited by the alkaloidal fraction.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2006년도 제27회 추계학술대회논문집
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• pp.67-70
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• 2006

본 논문에서는 진공실험 시설에서의 여러 미소추력 측정방법에 대한 소개와 필요성을 말하고 있다. 이는 실제 마이크로 인공위성에 적용을 위한 마이크로 추력기 개발을 위해 필수적인 요소이다. 우주환경모사를 위해 충남대학교 고진공 설비를 구축하였으며, 이 설비에서 효율적인 미소추력 측정이 이루어질 수 있도록 진공 챔버 내의 미소 추력측정 방법에 대한 연구를 진행하였다.

• 한국동물학회:학술대회논문집
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• 한국동물학회 2001년도 한국생물과학협회 학술발표대회
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• pp.116.1-116
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• 2001

No Abstract, See Full Text

• 한국동물학회:학술대회논문집
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• 한국동물학회 2001년도 한국생물과학협회 학술발표대회
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• pp.132.1-132
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• 2001

No Abstract, See Full Text

• Archives of Pharmacal Research
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• 제13권1호
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• pp.51-54
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• 1990

Effect of scoparone (6, 7-dimethoxycoumarin) on the hepatic cytosolic sulfotransferase activity was investigated. After treatment with scoparone, hepatic cytosolic sulfotransferase activity was increased with odse and time-dependent manner as compared to control. The $V_{max}$ value (control = 1.33 n moles/mg protein/min, scoparone = 2.39n moles/mg protein/min) without affecting the $K_m$ value for p-nitrophenol was increased by the scoparone treatment. Whereas, the hepatic cytosolic sulfotransferase was not changed by the addition of scoparone in vitro, and was strongly inhibited by the addition of metabolites of scoparone. The results obtained suggest that the characteristics of increase in the enzyme activity may include induction of enzyme proteins, and may be due to the metaboltes of scoparone.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.909-911
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• 1999

This paper proposes a robust control system with the disturbance observer for BLDC servo system. The overall control system is composed of the speed controller which is implemented with PI controller and the disturbance observer with free parameters. The BLDC servo system can improve the closed loop characteristics without affecting the command input response. The characteristics of the closed loop system is improved by suppressing disturbance effectively with the disturbance observer. Measurement noise is also considered by adjusting bandwidth of free parameters. We can overcome the drawbacks of the conventional PI controller. Finally, the performance of the controller is analyzed theoretically and some simulation results are presented to demonstrate the better performance than the conventional PI controllers.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.573-575
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• 1999

Brushless DC motor which has the characteristics of high efficiency and high torque, can be controlled speed by the encoder or resolver. But these sensors cost highly and have the problem that they increases the size. This paper proposes a speed control by Hall-Sensor. which is small and cheap. But this sensor has a problem of low resolution. To solve the problem this paper proposes speed control by using a least square algorithm.

• 대한기계학회논문집A
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• 제30권6호
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• pp.662-669
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• 2006

The pneumatic muscle actuator consists of an air bellows tube with two end-flanges. The air bellows tube is made from rubber layers and flexible sheathing formed from nylon 6 fibers. This structure can be stretched or compressed to convert the radial expansive forces into contractile forces. We performed the finite element analysis and the performance test of pneumatic muscle actuator. Also, the pneumatic muscle actuator was manufactured and tested by home-made tester. The results of FEA was similar with performance test below the maximum error of 42 %.