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박희욱,김대근 한국생약학회 2005 생약학회지 Vol.36 No.3
Four compounds were isolated from the twigs of Vaccinium oldhami (Ericaceae) through repeated column chromatography. Their chemical structures were elucidated as (+)-catechin, (−)-epicatechin, proanthocyanidin A-2, and cinnamtannin B1, respectively, by spectroscopic analysis.
Cytotoxic Germacranolide Sesquiterpenes from the Bark of Magnolia kobus
박희욱,이재혁,최상운,백남인,김성훈,양재헌,김대근 대한약학회 2010 Archives of Pharmacal Research Vol.33 No.1
A new (3) and three known germacrane-type sesquiterpenoids were isolated from the chloroform-soluble fraction of the methanolic extract of the bark of Magnolia kobus (Magnoliaceae) through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as costunolide (1), parthenolide (2), isobisparthenolidine (3), and bisparthenolidine (4) by spectroscopic analysis. Compounds 1-4 exhibited cytotoxicity against human A549, SK-OV-3, SK-MEL-2, and HCT15 tumor cells.
박희욱,백남인,김성훈,권병목,정인식,박미현,김상현,김대근 한국생약학회 2004 생약학회지 Vol.35 No.4
Five compounds were isolated from the whole plant of Arabis glabra (Cruciferae) through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structure were elucidated as salicylic acid, 2,5-dihydroxybenzoic acid, astragalin, rutin, and quercetin-3,7-O-β-D-diglucopyranoside by spectroscopic analysis.
Hemiterpenes of Ilex macropoda Miq.
박희욱,김주신,백남인,김성훈,임종필,김대근 한국생약학회 2005 Natural Product Sciences Vol.11 No.4
The chromatographic separation of the methanolic extract from the twigs of Ilex macropoda(Aquifoliaceae) led to the isolation of three hemiterpenes, and their chemical structures were elucidated byphysico-chemical and spectroscopic analysis. Their structures were characterized as 4,5-dihydroxyprenyl caffeate(1), 4-(6-O-caffeoyl-β-D-glucucopyranosyloxy)-5-hydroxyprenyl caffeate (2), and 4-β-D-glucucopyranosyloxy-5-hydroxyprenyl cafeate (3), respectively. Compound 1 was isolated for the first time from plant.
박희욱(Hee Wook Park) The Research and Information Service 2008 남부대학교 논문집 Vol.8 No.-
Two compounds were isolated from the butanol soluble fraction of Magnolia kobus (Magnoliaceae) through repeated silica gel and Sephadex LH-20 column chromatography. Their chemical structures were elucidated as (+)-syringaresinol and syringin by spectroscopic analysis respectively.
겨울철 SET<SUP>*</SUP>의 실외 환경 적용 가능성 검토
박희욱(Hee-Ouk Park) 한국생활환경학회 2000 한국생활환경학회지 Vol.7 No.2
The thermal indices which show the relation between human thermal sensation and surrounding outdoor climatic conditions is not made so clear as in the indoor one. In the paper, the applicability of SET<SUP>*</SUP> to the outdoor climatic environment in the winter was examined by the experiment of thermal sensation from physiogical and psychological view point. The result are as follows. SET*<SUP></SUP> upper 19℃ and MST upper 31.4℃ are considered to be the comfort zone in the outdoor environment. The thermal sensation was more influenced by air velocity than by solar radiation.
변혁적리더십과 서번트리더십이 직무만족, 조직몰입, 서비스품질 및 고객만족에 미치는 영향
박희욱(Hee Wook Park),이준혁(Jun Hyuk Lee) 한국호텔외식관광경영학회 2014 호텔경영학연구 Vol.23 No.2
The purpose of this study was to empirically determine the relationship between the hotel managers` leadership and internal and external customer satisfaction. 522 data were collected from the food and beverage department employees of one casino hotel in Kangwon province and six deluxe hotels in Seoul. Results showed that transformational leadership had a significant effect on employee satisfaction, and service quality, yet did not influence organizational commitment. Servant leadership had also a significant effect onemployee satisfaction, yet had no significant effect on organizational commitment and service quality. These organizational status might be influenced by an organizational behavior which had a normative characteristics. Especially, the servant leadership might not be applied to Korean hotel employees. Therefore, the servant leadership training should be reinforced to employees and managers in Korean hotel industry. We also found that employee satisfaction had a significant effect on organizational commitment; organizational commitment had a significant effect on service quality; service quality had a significant effect on customer satisfaction (Heskett et al. , 1994; Kim, 2014). However, as a result of identification of indirect effect, transformational leadership had a significant effect on organizational commitment, and servant leadership also had a significant effect on organizational commitment. Therefore, we have to consider the indirect effect of employee satisfaction. The last hypothesis(comparison between casino hotel and general hotel) was partially supported by the impact difference of the relationship between organizational commitment and service quality. Finally, the study`s contributions and implications for theory and practice, limitations, and suggestions for future research were discussed.