• Animal Systematics, Evolution and Diversity
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• 제36권2호
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• pp.107-112
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• 2020

A new genus Parkiana Cho, gen. nov., belonging to Torodorinae of Lecithoceridae, is described from Madagascar, with two new species: P. matutinalis Cho & Agassiz, sp. nov. and P. andasibensis Cho & Agassiz, sp. nov. Although superficially similar to Thubdora Park, 2018, some of their morphological characters, such as wing venation, are unique and the species of the genus are grouped apart from Thubdora in a preliminary phylogenetic analysis based on COI barcode sequences. In addition to the specific descriptions, adults and genitalia for the two new species are illustrated.

• 생약학회지
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• 제33권3호통권130호
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• pp.157-168
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• 2002

Aconites distribute widely in northern hemispere of the earth reaching to arctic zone from warm and temperate one. Chinese crude drug 'Cho O'(草烏) has been used as a remedy for apoplexy, dyspepsia, neuralgia, chronic rheumatis etc. Though the botanical origin of the crude drug has been considered to be Aconitum species of Ranunculaceae, there has been no confirmation on it. To clarify the botanical origin of Cho O, the morphological and anatomical characteristics of the roots of Aconitum species growing in Korea, i.e. A. chiisanense, A. ciliare, A. jaluense, A. napiforme, A. proliferum, A. pseudoproliferum and A. triphyllum were studied. As the result, Cho O was proved to be the roots of Aconitum triphyllum, A. jaluense, A. chiisanense and A. napiforme.

• 생약학회지
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• 제38권1호
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• pp.45-49
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• 2007

Chinese crude drug "Lu-ti-cao"(鹿蹄草) has been used as a remedy for beriberi, cut bleeding, snake bite, etc. In Korea, the drug is called "Nok Je Cho" and has been used as a folk medicine of the same effect as that of Chinese equivalent. The original plant of this drug has not yet been as certained. To clarify the botanical origin of "Nok Je Cho", the morphological and anatomical characteristics of the leaves of Pyrola species growing in Korea, i.e. P. incarnata, P. japonica, P. minor, P. renifolia, P. secunda were studied. As a result, it was clarified that "Nok Je Cho" was the leaf of Pyrola japonica and Pyrola minor.

• 생약학회지
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• 제26권2호
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• pp.168-174
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• 1995

Korean folk medicine 'Man Byung Cho' has been used to cure abdominal pain, athlete's foot and neuralgia. The botanical origin of the crude drug has never been studied pharmacognostically. To clarify the botanical origin of 'Man Byung Cho', the leaf morphology and anatomy were examined for the Korean species of Rhododendron subgenus Hymenanthes, such as R. brachycarpum G. Don, R. brachycarpum var. rosueum Koidz. and R. aureum Georgi. The study shows that 'Man Byung Cho' is the leaf of R. brachycarpum and R. brachycarpum var. roseum.

• 생약학회지
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• 제39권2호
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• pp.137-141
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• 2008

Korean folk medicine 'Ki Rin Cho' has been used to cure stanching and counteracting poison. The botanical origin of the crude drug has never been studied pharmacognostically. To clarify the botanical origin of 'Ki Rin Cho', the morphological and anatomical characteristics of Sedum species growing in Korea, i.e. S. aizoon, S. kamtschaticum and S. latiovalifolium were studied. As a result, 'Ki Rin Cho' was proved to be Sedum kamtschaticum and Sedum aizoon.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1994년도 하계학술대회 논문집 A
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• pp.316-318
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• 1994

Photovoltaic is considered to be one of the most promising technologies which can greatly contribute to future energy supply because or a large, secure, essentially inexhaustible and broadly available resource -sunlight. This paper analyzes reduction of synthetic power peak value through weather data and quantity or generation. This explanation and estimations analyses grid connected power system.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.682-684
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• 1995

The most effective way to improve the performance of a fuzzy controller may be to optimize look-up values. Look-up values are derived from processes used input-output scale factors, membership functions, rule base, fuzzy inference method and defuzzification. It is powerful way to modify or organize look-up table values. In this paper, We propose the look-up values self-organizing fuzzy controller(LSOFC). We use the plus-minus tuning method(PMTM), scanning values through the processes of addition and subtraction. We show the efficiency of this LSOFC by the results of simulation for nonlinear time-varying plant with unmodelled dynamics.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1996년도 하계학술대회 논문집 B
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• pp.949-952
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• 1996

The ultrasonic motor(USM) has good characteristics such as compact size, silent motion, low speed, high torque and high speed response. The USM is driven by 2-phase AC electricity. The control parameters of USM are voltage, phase difference, frequency of input power, etc. In this paper, we propose voltage difference control. And we designed USM controller to adjust voltage and phase using pLSI(programmable Large Scale Integration). Voltage difference control has many advantages that are lower current, lower power than phase difference control. Especially there is nearly zero ampere at the zero point of speed and torque. we can apply this voltage difference control to the compliance control of DD manipulator.

• Bulletin of the Korean Chemical Society
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• 제32권4호
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• pp.1187-1194
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• 2011

The hydrogen abstraction reaction of $CF_3CH_2CHO$ + OH has been studied theoretically by dual-level direct dynamics method. Two stable conformers, trans- and cis-$CF_3CH_2CHO$, have been located, and there are four distinct OH hydrogen-abstraction channels from t-$CF_3CH_2CHO$ and two channels from c-$CF_3CH_2CHO$. The required potential energy surface information for the kinetic calculation was obtained at the MCG3-MPWB//M06-2X/aug-cc-pVDZ level. The rate constants, which were calculated using improved canonical transitionstate theory with small-curvature tunneling correction (ICVT/SCT) were fitted by a four-parameter Arrhenius equation. It is shown that the reaction proceeds predominantly via the H-abstraction from the -CHO group over the temperature range 200-2000 K. The calculated rate constants were in good agreement with the experimental data between 263 and 358 K.

• 한국대기환경학회지
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• 제18권1호
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• pp.11-23
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• 2002

The concentrations of aldehydes were measured in downtown area of Buchun and Kwanghwamoon of Seoul from October 1997 to August 1998 using 2-series impingers. The data have been analysed to identify the seasonal pattern of aldehyde sources in metropolitan areas. The measured concentration (in ppbv) of aldehydes were 8.86 $\pm$ 7.28 HCHO (formaldehyde) and 7.79$\pm$7.29 $CH_3$CHO (acetaldehyde) in Buchun, while recording 10.13$\pm$8.58 (HCHO) and 7.64$\pm$6.65 ($CH_3$CHO) in Kwanghwamoon. Their diurnal variation patterns showed significant increase of HCHO and $CH_3$CHO concentration in early afternoon, indicating an increase in secondary sources. Their concentrations however decreased in the nighttime, regardless of seasons. The strength of correlations between certain pairs such as (1) HCHO and CO and (2) $CH_3$CHO and CO were generally high during the winter months (0.64< r < 0.84), suggesting the possibility of similar source processes for HCHO, $CH_3$CHO and CO. On the other hand during the summer months, their correlations are frequently lower than winter months. We suggested that the complexity of source/sink processes during the summer period may reduce the correlations between aldehyde and CO.