• YAKHAK HOEJI
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• v.23 no.2
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• pp.119-124
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• 1979

Eight derivatives of arylpropionic acid, arylcarbonylpropicnic acid, and arylhydroxybutyric acid were synthesized and their structures were elucidated on the basis of elemental analysis and spectral data. Also their antiinflammatory activities were evaluated by the method of the inhibitory effect on the carrageenin-induced rat paw edema and compared with phenylbutazone. Compound (I) exhibited 59% edema inhibition vs control when 100 mg/kg, was orally administered, whereas phenylbutazone showed 57.8% for 50mg/kg.

• Archives of Pharmacal Research
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• v.15 no.1
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• pp.91-94
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• 1992

A convenient method for the preparation of N-aryl thiazolines 4a b, 2, 2-dichlorothiophene 5, thiazolinones 6 and 8 and 2, 6-dihydrothiopyran 2-thione 9 derivatives is described. This depends on interaction of 3, 3-dimercapto-1(4-biphenyl)-2-propen-1-one 1 with dichloroethane, amines, trichloroacetylchloride, chloroacetamide, ethylene oxide and epichlorohydrin. Antimicrobial activity of the obtained products was studied.

• Korean Journal of Mathematics
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• v.23 no.2
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• pp.283-291
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• 2015

In the optimal control problem, at first we search the expected optimal solution by using Pontryagin type's necessary conditions called the maximum principle. Next we use the sufficient conditions to conclude that the searched solution is optimal. In this article the sufficient conditions are studied. The value function is used for sufficient conditions.

• Proceedings of the Materials Research Society of Korea Conference
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• 2012.05a
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• pp.59.2-59.2
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• 2012

Polymer solar cells utilize bulk heterojunction (BHJ) type photo-active layer in which the electron donating polymer and electron accepting $C_{60}$ derivatives are blended. We found there is significant charge recombination at the interface between the BHJ active layer and electrode. The charge recombination at the interface was effectively reduced by inserting wide band gap inorganic interfacial layer, which resulted in efficiency and stability enhancement of BHJ polymer solar cell.

• Bulletin of the Korean Chemical Society
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• v.18 no.5
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• pp.534-540
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• 1997

4H,6H-Furo[3,4-c]isoxazoles (Ⅰ-Ⅳ), potential fungicides, have been designed and synthesized via intramolecular [2+3] cycloaddition of nitroalkyne 3 as a key step. The broad spectrum of fungicidal activities of furoisoxazoles (Ⅰ-Ⅳ) were observed on plant pathogens at 250 ppm. Furoisoxazoles Ⅱ, Ⅲ with chlorophenyl at 6-position and methyl or alkylated oxime group at 3-position gave effective control of plant diseases. The furoisoxazole Ⅳ with a chlorophenyl group at 4-position also resulted in high fungicidal activities.

• Journal of Yeungnam Medical Science
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• v.9 no.1
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• pp.90-101
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• 1992

In rat kidney, the changes in concentrations of nucleotides and their derivatives during ischemia induced by renal artery ligation was measured quantitatively with high performance liquid chromatography(HPLC). After the ligation of renal artery for 60minutes, the concentrations of the nucleotides and derivatives were measured. In ischemic tissue, IDP was significantly decreased from $217.4{\pm}12.68{\mu}g$ in control to $80.7{\pm}18.39{\mu}g$ (p<0.01) ; ATP, $307.2{\pm}56.63{\mu}g$ to $47.6{\pm}5.95{\mu}g$ (p<0.01) ; ADP+AMP, $227.1{\pm}7.98{\mu}g$ to $61.4{\pm}3.92{\mu}g$(P<0.01); $NAD^+$, $217.9{\pm}4.49{\mu}g$ to $126.6{\pm}10.44{\mu}g$(P<0.01) ; GTP, $202.5{\pm}23.76{\mu}g$ to $117.7{\pm}14.24{\mu}g$ (P<0.05) ; GMP, $54.5{\pm}9.03{\mu}g$ to $23.7{\pm}0.46{\mu}g$(p<0.05), and inosine, $16.6{\pm}3.45{\mu}g$ to $7.8{\pm}0.87{\mu}g$ (P<0.05). But hypoxanthine and xanthine were significantly increased from $113.0{\pm}15.58{\mu}g$ to $159.7{\pm}12.07{\mu}g$ (P<0.05) and from $87.7{\pm}6.77{\mu}g$ to $173.1{\pm}12.52{\mu}g$ (P<0.01). In ischemic kidney, concentration of ATP was decreased to 39.9% of control at 10 minutes, 19.8% at 30 minutes, and 15.5% at 60 minutes, and ADP+AMP were decreased to 70.3% of control at 10 minutes, 67.3% at 30 minutes, and to 27.0% at 60 minutes, but hypoxanthine and xanthine were increased to 121.5% and 127.1% at 10 minutes, 126.0% and 174.4% at 30 minutes, and 141.4% and 197.3% at 60 minutes Total adenosine nucleotides were decreased to 20.3% of control during 60 minutes of ischemia, but hypoxanthine and xathine were increased to 157.5 % of control. These results suggest that the changes in the concentration of nucleotides and their metabolic derivatives are useful indices of the extents of tissue ischemia in rat kidney.

• 제어로봇시스템학회:학술대회논문집
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• 1993.10b
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• pp.534-540
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• 1993

In this paper, we present an iterative learning method of compensating for position sensor error. The previously known compensation algrithms need a special perfect position sensor or a priori information about error sources, while ours does not. To our best knowledge, any iterative learning approach has not been taken for sensor error compensation. Furthermore, our iterative learning algorithm does not have the drawbacks of the existing iterative learning control theories. To be more specific, our algorithm learns a uncertain function inself rather than its special time-trajectory and does not request the derivatives of measurement signals. Moreover, it does not require the learning system to start with the same initial condition for all iterations. To illuminate the generality and practical use of our algorithm, we give the rigorous proof for its convergence and some experimental results.

• The Transactions of the Korean Institute of Power Electronics
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• v.18 no.6
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• pp.523-529
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• 2013

A sensorless speed control of a permanent magnet synchronous motor(PMSM) which utilizes MRAS based scheme to estimate rotor speed and position is presented. Considering an error between real and estimated rotor position values, a state equation of PMSM in the synchronous d-q reference frame is represented. A state equation of model system which uses estimated speed and nominal parameter values is expressed. To minimize the errors between the derivatives of d-q axis currents of real and model system, MRAS based adaptation mechanisms for the estimation of rotor speed and position are derived. On the other hand, for the acceleration stage of motor just before the sensorless operation, an acceleration scheme using only d-axis current control is proposed. To show the validity of the proposed scheme, experimental works are carried out and evaluated. During acceleration stage, the acceleration scheme using only d-axis current command shows good acceleration performance and controlled current level. For the sensorless operation, at low speed (5% of rated speed), a good performance is observed.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2011.11a
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• pp.3-4
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• 2011

In this study, the nonlinear mathematical model of Manta type UUV is derived the hydrodynamic derivatives and the sliding mode controller of Manta type UUV test bed is designed. The sliding mode control scheme is used for robust control on the nonlinear motion. The designed controller is used the depth and heading control. It is based on the 6 DOF mathematical model with effect of the ocean currents. As a result, the performance of the designed controller is confirmed by computer simulation.

• Bulletin of the Korean Chemical Society
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• v.33 no.5
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• pp.1703-1706
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• 2012

Rice blast is the most serious disease of rice due to its harmfulness and its world wide distribution. $Magnaporthe$ $grisea$ is the cause of rice blast disease and destroys rice enough to feed several tens of millions of people each year. Fungicides are commonly used to control rice blast. But $M.$ $grisea$ acquires resistance to chemical treatments by genetic mutations. 2-Phenylimino-1,3-thiazolines were proposed as a novel class of fungicides against $M.$ $grisea$ in the previous study. To develop compounds with a higher biological activity, a new series of 2-phenylimino-1,3-thiazolines was synthesized and its fungicidal activity was determined against $M.$ $grisea$. The QSAR analysis was carried out on a series of 2-phenylimino-1,3-thiazolines. The QSAR results showed the dependence of fungicidal activity on the structural and physicochemical features of 2-phenylimino-1,3-thiazolines. Our results could be used as guidelines for the study of the mode of action and further design of optimal fungicides.