• Tuberculosis and Respiratory Diseases
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• v.39 no.4
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• pp.325-333
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• 1992

Background and Methods: To study the effects of corticosteroid (CS) on the parquat (PQ) induced lung injury, serial cellular analyses of bronchoalveolar lavage (BAL) fluid were done with simultaneous histopathologic examination after intraperitoneal injection of PQ on the rats. The sacrificed animals were divided into three groups; control group, PQ group received intraperitoneal injection of 20 mg/kg of PQ, and CS group received daily injection of Methylprednisolone sodium succinate (20 mg/kg) in addition to PQ. Results: 1) Cellular analyses of BAL fluid: The total cell count in the BAL fluid were increased gradually from 6 hours after PQ administration (p<0.05), and was decreased at 3 days after (p<0.05). These changes were mainly due to the effects of PQ on the neutrophil influx (p<0.05). But, the number of macrophage and the percentage of lymphocyte in total cells showed little changes. The CS administration showed the suppression of neutrophil influx in the BAL fluid (p<0.05), but could not show any significant effect on the number of macrophage and lymphocyte. 2) Histopathologic examination: In the PQ group, inflammatory changes especially with prominant neutrophil infiltration were gradually progressed over time. Those changes were found in both alveolar space and interstitium with resultant alveolar structural changes, but subsided from 3 days after. CS suppressed inflammatory changes in the alvolar space and interstitium, especially with decreased infiltration of neutrophil. Conclusion: CS suppressed neutrophil infiltration in the acute lung injury induced by PQ, those findings were ascertained by serial cellular analyses of BAL fluid and histopathologic examination.

• Journal of the Institute of Electronics Engineers of Korea TE
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• v.39 no.1
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• pp.46-54
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• 2002

The world was opened by communication network because of fast improvement and diffusion of information communication. And information was effected in important factor that control economy improvement of the country. The country should improve the information security system because of necessity to maintain its information security independently. Therefore we have used the SEED cipher algorithm and designed the cipher chip of the voice band signal using the Xilinx Co. XCV300PQ240 chip. At the result we designed the voice signal cipher chip of the maximum frequency 47.895MHz and the total equivalent gate 27,285.

• Korean Journal of Microbiology
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• v.30 no.6
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• pp.460-465
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• 1992

The effect of PSOD expression on lacZ-sodP fusion (pYK4) was explored in Escherichia coli sodA sodB mutants (QC774) under oxidative stress. In this system, although .betha.-galactosidase activity was not fully induced by isopropyl-1-thio-.betha.-galactosidase (IPTG) and was inhibited by glucose, functional PSOD was under lacZ promotor control and was induced by IPTC, lactose, PQ and copper isons, finally, the results show that higher PSOD expression leel was consistently importnat in defending against superoxide radicals.

• KIEE International Transaction on Electrical Machinery and Energy Conversion Systems
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• v.2B no.4
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• pp.191-200
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• 2002

When power consumption increases, power supply must be efficient and reliable for good power quality. The studies on compensation system of power quality are processing actively. Voltage sag among of factors for power quality is generally PI dual control that voltage sag compensation is used. But this control is no more available since of 120[KHz] ripple rejection. So we proposed the control algorithm using PID control in 3-phase unbalanced power system and the series voltage compensator, when voltage sag occurs.

• Proceedings of the KIPE Conference
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• 2002.11a
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• pp.181-185
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• 2002

This paper discusses power balance control of photovoltaic/wind/diesel hybrid generation system for remote area power supplies. There are many control methods for hybrid power system. Among others, it must be adopted that the control method to guarantee a stable balance between supply and demand, regardless of the fluctuation of generator power by atmospheric changes. In this paper, it Is proposed that a hybrid generation system has a power-balanced controller to equilibrate generation power with a load demand, which is composed of DC bus-type power systems. To execute power balance control, it is assumed that all of power generators have a equivalent current-source characteristics. Through the results of simulation, the proposed scheme was verified.

• Proceedings of the KIPE Conference
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• 2012.11a
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• pp.131-132
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• 2012

Implementation of fuzzy controller for the rotor side converter of a utility-connected double-fed induction generator (DFIG) for wind power generation systems (WPGS) described in this paper. In the control schemes, real and reactive powers (PQ) at the stator side of DFIG are strictly controlled to supply the power to the grid. A TMS320VC33 DSP is selected as the controller of this system.

• Journal of Power Electronics
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• v.3 no.1
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• pp.40-48
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• 2003

In this paper, a hybrid power system with photovoltaic/wind/diesel generators is proposed to solve the defect of stand-alone type power system in a remote area. A hybrid power system has a power-balanced controller to equilibrate generation power with a given load demand and which is composed of common DC power system. To execute a power-balanced control, a hybrid power system is assumed that all of power generators have the characteristics of an equivalent current-source and load sharing control technique must be needed at the same time. So this paper discusses the structure of power-balance control for hybrid power system. And through the results of simulation, the proposed scheme was verified.

• Journal of the Korean Society of Food Science and Nutrition
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• v.33 no.7
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• pp.1192-1200
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• 2004

Gamma irradiations at 5 or 10 kGy were applied to salted and fermented anchovy sauce, for improving the hygiene Quality and evaluating the genotoxicological safety. In vitro genotoxicological safety of irradiated sauces was evaluated by Salmonella Typhimurium (TA98, TA100, TAI535 and TAI537) and E. coli WP2 uvrA, reversion assay, SOS chromotest (Escherichia coli PQ37), and chromosome aberration test (Chinese hamster lung fibroblast cells) in the absence or presence of an exogenous metabolizing system (S9 mix). The gamma-irradiated samples were not significantly different from nonirradiated-control for three in vitro tests (p＜0.05). ：In vivo micronucleus test using ICR mice (male) was not significantly different from the control at p＜0.05. The salted and fermented anchovy sauce exposed to 5 or 10 kGy-gamma ray revealed negative results in these three in vitro mutagenetic tests and in vivo micronucleus test upto 50,000 $\mu$g/plate, respectively. The results indicated that 5 or 10 kGy gamma-irradiated salted and fermented anchovy sauces did not show any mutagenicity.

• KSBB Journal
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• v.18 no.6
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• pp.517-521
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• 2003

Superoxide dismutase which is metalloenzyme that decomposes superoxide radicals into hydrogen peroxide and molecular oxygen. Vitreoscilla has FeSOD. Expression of FeSOD to paraquat was largely constitutive. This suggests that the basal level of FeSOD is sufficient to provide protection against superoxide generated during normal aerobic metabolism. Induction of SOD by iron supports that insertion of the active site metal into the corresponding apoprotein. The effect of paraquat on induction by iron seemed that iron brought the synergism effect in SOD activity with paraquat. It suggests that the relief of growth inhibition is due to protection against the lethality of O$_2$afforded by the elevated SOD. There may be control of FeSOD activity posttranslationally. Posttranslation control of enzyme function is particularly feasible for a metalloenzyme, for which conversion of apo- to holoenzyme may be the rate-limiting or regulatory step.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.52 no.10
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• pp.577-583
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• 2003

The control method of Thyristor Controlled Reactor(TCR) is described in this paper for compensating the poor power factor, unbalanced and/or nonlinear load. Also, auxiliary controller such as DC current and power-factor controller is described. The reference current of TCR is calculated from the active and reactive Current components for each of the positive and negative sequence components in the load Currents. This reactive power control technique was verified by simulation program and will be used in 5Mvar TCR system, which will be installed next year at hot rolled mill at POSCO, located in Kwang-Yang.