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황선숙(Seon-Suk Hwang),황의염(Eui-Young Hwang),남궁완(Wan Namkoong) 유기성자원학회 1995 유기물자원화 Vol.3 No.2
본 연구의 목적은 유기성폐기물 퇴비화시 교반강도가 퇴비화공정에 미치는 영향을 알아보기 위한것이다. 주된 연구지표는 교반강도와 초기수분함량이었다. 본 연구를 위하여 기계식 교반장치를 갖춘 실험실규모의 퇴비화반응조가 이용되었다. 실험대상폐기물은 생분뇨슬러지와 감압증발처리공정을 거친 분뇨슬러지,그리고 돈분을 이용하였다. 초기수분함량이 60%와 63% 인 경우 연속교반시 간헐교반보다 유기물분해율이 더 높게 나타났다. 또한 시료의 물리적 성상도 연속교반이 간헐교반보다 더 균퉁질의 양호한 상태를 나타내었다. 한편 초기 수분함량 68% 인 경우는 혼합되기 보다는 시료 일부가 반죽상태를 형성하는 문제가 발생하였으며 유기물분해율도 연속교반의 경우가 간헐교반보다 더 낮게 나타났다. The purpose of this study was to investigate the effect of mechanical mixing intensity on composting. The major parameters investigated were the mixing intensity and initial moisture content. Laboratory scale composting reactors with mixing equipment were used in this study. Wastes used for the study were raw nightsoil sludge, nightsoil sludge after vacuum evaporation treatment and pig manure. When moisture contents were 60% and 63%, amount of organic material degraded in the continuous mixing reactors was higher than that in the intermittent mixing reactors. Compost produced from reactors with continuous mixing had better texture than that obtained from reactors with intermittent mixing. When moisture content was 68%, organic waste was kneaded rather than mixed in the continuous mixing reactors. Amount of organic material degraded in the continuous mixing reactors also was lower than that in the intermittent mixing reactors.
황선완 ( Hwang Seon Wan ),김종관 ( Kim Jong Gwan ),이태원 ( Lee Tae Won ) 한국수산과학회 2003 한국수산과학회지 Vol.36 No.6
N/A Seasonal variation of the fishery resource in the shallow waters of Ganghwado tidal flat was investigated using monthly collected samples with a fence net from June 1998 to May 1999. Thirty-six species were found, including 27 fish species, 6 crustaceans, and 3 molluscs. Of the fish, Konosirus punctatus, Surdinella zunasi, Liza haernatocheila and Synechogobius hasta dominated in the number of individuals (92.1 %) and in biomass (94.5%). A few number of resident species, such as L. haernatocheila and S. hasta, were collected only during the cold months. As the water temperature increased in the spring, the adult migratory fish, such as K. punctatus and S. zunasi, were collected. In the summer, the juvenile fish recruited in the shallow water showing a peak in fish abundance. The data suggested that they grew until late autumn before moving to deeper waters for over-wintering. The principal component analysis showed that the seasonal variation in species composition was principally determined by water temperature and/or water temperature related factors. The species composition of the fish assemblage in the study area suggested that these species are highly adapted to extreme seasonal temperature variation and high water turbidity.
Characterization of Angiogenesis Inhibitor Effect of Green Tea Seed Extract
Hwang, Jae-Ho,Lee, Sung-Hoon,Rha, Sung-Ju,Yoon, Ho-Seop,Shin, Jin-Hyuk,Lee, Jin-Hee,Seo, Myeong-Jin,Kang, Kyeong-Wan,Han, Kyeong-Ho,Kim, Yong-Joo,Kho, Kang-Hee,Kim, Seon-Jae,Shin, Tai-Sun The Korean Society for Integrative Biology 2009 Animal cells and systems Vol.13 No.2
Green tea seed was extracted with absolute ethanol,and the green tea seed extract(GTSE)was subjected to assays for toxicity, antioxidant ability, angiogenesis inhibitory effects and cell adhesion, as well as western blotting, and an in vivo experiment against 4 high-ranking adult cancers in Korea. Our series of experimental data demonstrated that GTSE has an antioxidant ability superior to that of EGCG in the green tea leaf, and also exhibits a profound high tumor growth inhibitory activity on a variety of cancer cell lines, as well as nude mice infected with cancer cells. GTSE was identified as a natural anticancer compound showing excellent angiogenesis inhibition and cancer cell suppression abilities. Our preliminary observations also indicate that GTSE may be another potential source of natural dietary antioxidants and also may be applicable as a novel natural anticancer agent.
( Seon Young Park ),( Wan Sik Lee ),( Yeong Eun Joo ),( Hyun Soo Kim ),( Sung Kyu Choi ),( Jong Sun Rew ),( Chang Hwan Park ),( Seok Lee ),( Ho In Hwang ),( Sang Min Yum ),( Seok Cho ),( Keong Won Yoo 대한소화기학회 2007 SIDDS Vol.9 No.-
Background/Aims: Endoscopic biliary drainage is an established mode of treatment for acute suppurative cholangitis. Endoscopic retrograde biliary drainage (ERBD) using a plastic stent is suggested to be as effective as endoscopic nasobiliary drainage (ENBD) for temporary biliary drainage in acute suppurative cholangitis. However, there were a few studies comparing between ERBD and ENBD in acute suppurative cholangitis. We compared the safety and efficacy of ERBD and ENBD in patients with acute suppurative cholangitis. Methods: From April to August 2007, forty patients with acute suppurative cholangitis underwent endoscopic biliary drainage with ENBD (22) and ERBD (18). We retrospectively analyzed their safety and efficacy. Results: Mean duration of indwelling catheter were 4.3 days in the EMBD group and 4.6 days in the ERBD group (p=0.67). Leukocyte counts became normal after a median time of 2.7 days in the ENBD group and 1.7 days in the ERBD group (p=0.18). Total bilirubin became normal after a median time of 2.8 days in the ENBD group and 3.4 days in the ERBD group (p=0.44). There were 6 ERCP-related complications in the ENBD group and 10 in the ERBD group (p=0.11). The complications were symptomatic pancreatitis (2 in ERBD), bleeding (3 in ERBD and 4 in ENBD), and increased amylase (2 in ENBD and 5 in ERBD). There were no cases of occlusion or migration of ENBD or ERBD. But, one patient pulled out the ENBD catheter. There was no difference of frequency of procedure (p=0.06) and hospital stay (p=0.79) between the 2 groups. Conclusions: ERBD is safe and effective alternative method of decompressing the bile duct in acute suppurative cholangitis.
Seon-Woong Hwang,Weui-Bong Jeong,Wan-Suk Yoo,Kyu-Hwan Kim 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.11
The hermetic rotary compressor is one of the most important components of an air condi-tioning system since it has a great effect on both the performance and the noise and vibration of the system. Noise and vibration occurs due to gas pulsation during the compression process and to unbalanced dynamic force. In order to reduce noise and vibration, it is necessary to identify their sources and transmission path and effectively control them. Many approaches have been tried in order to identify the noise transmission path of a compressor. However, iden-tification has proven to be difficult since the characteristics of compressor noise are complicated due to the interaction of the compressor parts and gas pulsation. In this study, the statistical energy analysis has been used to trace the energy flow in the compressor and to identify the transmission paths from the noise source to the exterior sound field.<br/>
Hwang, Seon-Woong,Jeong, Weui-Bong,Yoo, Wan-Suk,Kim, Kyu-Hwan The Korean Society of Mechanical Engineers 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.11
The hermetic rotary compressor is one of the most important components of an air conditioning system since it has a great effect on both the performance and the noise and vibration of the system. Noise and vibration occurs due to gas pulsation during the compression process and to unbalanced dynamic force. In order to reduce noise and vibration, it is necessary to identify their sources and transmission path and effectively control them. Many approaches have been tried in order to identify the noise transmission path of a compressor. However, identification has proven to be difficult since the characteristics of compressor noise are complicated due to the interaction of the compressor parts and gas pulsation. In this study, the statistical energy analysis has been used to trace the energy flow in the compressor and to identify the transmission paths from the noise source to the exterior sound field.