http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
종 분포 모형을 이용한 구상나무림의 지속 및 쇠퇴에 관한 연구 - 전라남도 광양시 백운산을 중심으로 -
조선희 ( Seon Hee Cho ),박종영 ( Jong Young Park ),박정호 ( Jeong Ho Park ),이양근 ( Yang Geun Lee ),문이만 ( Lee Man Mun ),강상호 ( Sang Ho Kang ),김광현 ( Gwang Hyun Kim ),윤종국 ( Jong Guk Yun ) 한국산림과학회 2015 한국산림과학회지 Vol.104 No.3
The present study investigated the habitats of Korean fir trees (Abies koreana E. H. Wilson) on Mt. Baekwun (Baekwun-san), determined the current distribution, quantified the contribution of biological and nonbiological environmental factors affecting the distribution, derived actual and potential habitats, presented a plan for the establishment of protected areas, applied RCP 8.5 climate change scenario to analyze the effects of climate change on the future distribution of Korean fir trees, and predicted future potential habitats. According to the results of the study, 3,325 Korean fir trees (DBH >= 2.5 cm) inhabited Mt. Baekwun, and their distribution area was approximately 150 ha. Populations of Korean fir trees were confirmed to exist at an altitude of 900 m above sea level and were distributed up to 1,200 m. Based on potential distribution, areas appropriate for habitation by Korean fir trees were analyzed to be 450 ha, three times the current distribution area, with a focus on Sang Peak (Sang-bong), Eokbul Peak (Eokbul-bong), Ddari Peak (Ddari-bong), and Dosol Peak (Dosol-bong). The forest stands near Sang Peak, the main peak, were evaluated as those with the most appropriate potential for the habitation of Korean fir trees, and populations of the trees tended to prefer the northern slope rather than the southern slope. When climate change scenario RCP 8.5 was applied and future potential distribution was analyzed, the habitats were expected to decrease in area to 20 ha by 2050, with a focus on Sang Peak, and areas appropriate for habitation were predicted not to exist by 2080. Judging from such results, as global warming accelerates, the habitats of Korean fir trees are clearly expected to move from lowlands to highlands.
Molecular Cloning of the Gene Coding for 3-Isopropylmalate Dehydrogenase of Kluyveromyces fragilis
Park, Sung Hee,Lee, Dong Sun,Woo, Ju Hyung,Kim, Jong Guk,Hong, Soon Duck 한국산업미생물학회 1990 한국미생물·생명공학회지 Vol.18 No.3
Shuttle plasmid vector인 pHN114를 이용하여 Kluyveromyces fragilis의 3-siopropylmalate dehydrogenase 유전자를 cloning하였다. 그 결과 Saccharomyces cerevisiae의 leu2변이와 E. coli의 leuB변이를 상보하는 두 가지의 clone체 pJK104와 pJK106을 얻었다. Restriction mapping 결과 이들은 서로 반대방향으로 삽입되어 있었으며 expression activity는 pJK104가 높았다. pJK104에 삽입된 유전자를 BgⅢ와 SaⅡ으로 끊은 1.6kb fragment를 probe로 하여 Southern Hybridization한 결과 유전자의 유래가 Kluyveromyces fragilis임을 확인하였다. In order to clone the gene coding for 3-isopropylmalate dehydrogenase of Kluyveromyces fragilis, a shuttle plasmid vector pHN114 was used. It can serve as a cloning vector in Saccharomyces cerevisiae DBY746 for other Sau3AI-cleaved DNA segment of Kluyveromyces fragilis. Two cloned fragments which complement the leu2 mutation of Saccharomyces cerevisiae and E. coli were obtained. Their length was 4.4 kb an 3.5 kb, and their orientation was opposite each other. From the fact that the two recombinant plasmids were expressed in Saccharomyces cerevisiae and E. coli, probably the two inserts had the promoter of Kluyveromyces fragilis and that of Kluyveromyces fragilis was efficiently assosiated with RNA polymerase of Saccharomyces cerevisiae and E. coli. According to the result of Southern hybridization, we thought that the cloned fragment has low homology with 3-isopropylmalate dehydrogenase coding region of E. coli and Saccharomyces cerevisiae.
PD Occurrence Characteristics according to Voltage and Time in Solid Insulator
Park, Sung-Hee,Shin, Dal-Woo,Lim, Kee-Joe,Park, Young-Guk,Kang, Sung-Hwa The Korean Institute of Electrical Engineers 2003 KIEE International Transactions on Electrophysics Vol.3C No.1
The occurrence of partial discharge (PD) in solid dielectrics is very harmful because it leads to the deterioration of insulation by electrical, chemical, and thermal reactions as a combined action of the discharged ions bombarding the surface and by the action of chemical compounds that are formed by the discharge. Consequently, if any defects are present in the solid insulation system, performance decreases until the system breaks down. Therefore, removing or suppressing the defect is very important. Voids are a typical defect in the solid insulation system and are very harmful because they deteriorate insulation. As a basic step, studying the properties of PD in voids is important because an accurate knowledge of these properties is required to estimate the deterioration of voids. In this paper, the correlation between the size of voids and internal PD is discussed as a function of the time of the applied voltage and its magnitude. Magnitude, repetition rate, average discharge power, and average discharge current of PD in specimens with large voids were found to be larger than the others in this experiment. The smaller specimens had voids when the magnitude and number of PDs were reduced.
( Sung Hyung Choi ),( Myung Geun Oh ),( Kyung Min Bae ),( Ju Yeon Cho ),( Man Woo Kim ),( Chan Guk Park ),( Jun Lee ),( Young Dae Kim ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: The standard triple therapy used as the fi rst-line treatment for Helicobacter pylori infection are a combination of proton pump inhibitor(PPI), amoxicillin, and clarithromycin. The initial eradication rates of this combination therapy had been 90%. However, in recent studies the eradication rate has declined, and the adequate treatment of H. pylori is in question with insuffi cient questionable with insuffi cient studies. Therefore, this study evaluated the trend in the eradication rates of H. pylori infection over the last 7 years in the Gwang-ju area. Methods: 258 patients diagnosed with H. pylori infection between January 2003 and December 2009 who received standard one-week triple regimen were retrospectively evaluated according to year, regimen, and ulcer locations. Results: The overall eradication rate was 81.8%. The decrease in eradication rate with fi rst-line triple therapy over the study period was statistically signifi cant (p <0.05). There was no difference in the eradication rate in patients with different underlying gastric diseases. Although the difference in eradication rate according to the proton pump inhibitor used was not statistically signifi cant, the eradication rate for pantoprazole was lower compared to other proton pump inhibitors. Conclusions: The decrease in effectiveness of the recommended fi rst-line therapy for H. pylori eradication in the last decade is statistically signifi cant. Therefore, further studies and new guidelines should be discussed and changed in the near future.
The variation of biomechanical property of chondrocyteunder the various biological conditions
Sang-Guk Park,Kwon-Yong Lee,Daehwan Shin,박종철,이인섭,Heayoung Lee 한국물리학회 2005 Current Applied Physics Vol.5 No.5
It has been reported that mechanical properties of tissue-engineered cartilage were signicantly lower than those of natural car-tilage, even though many eorts have been made to regenerate high quality articular cartilage by tissue engineering techniques. Fur-ther studies must be conducted to nd an optimal technique for regeneration of qualitative cartilage with the type of cells,extracellular matrices, growth factors, scaolds, and bioreactors providing a proper mechanical stimulation. In this study, the eectsof culture time and three dierent kinds of extra cellular matrixes (ECM) in two levels of density on the variation of stiness(Young.s modulus,Eof ECM coatings improved Young.s modulus of chondrocyte. Type II collagen and bronectin signicantly increased the Young.smodulus of chondrocyte after 4 h culture time. This suggested that the variations of biological environment aected the biomechan-ical property of chondrocyte. This result provided the valuable information to tissue engineering approaches for obtaining moreimproved biomechanical property of regenerated cartilage tissue..