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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.
Sung Seo,Seong-Il Kim,Won-Ho Kim,Ki-Yong Kim,Sang-Hoon Lee,Jong-Geun Kim,Joung-Kyong Lee,Ji-Eon Park,Byung-Chul Lee,Hea-Shin Je,Chang-Ho Ko,Hong-Woog Kim 한국초지조사료학회 2009 한국초지조사료학회 학술대회논문집 Vol.2009 No.08
Nowadays, importance of regional specific on-farm research is largely increased in order to reduce the feeding cost of cattle. For this project, three regional districts (Yeongam, Yeonggwang and Jangheung) were selected wherein the cultivation area of forage production were largely increased from 1,200 ('08) to 2,600 ㏊ ('09) in Yeongam, 1,001('08) to 1,925 ㏊ ('09) in Yeonggwang, and 1,300 ('08) to 2,820 ㏊ ('09) in Jangheung district. Among the forage species, Italian ryegrass (IRG) and forage barley were predominantly cultivated in these regions. On the other hand, rye, grassland and summer annual forages were cultivated very little in a manner of land area. The productivity of forage barley was slightly increased 21.5('06), 26.2('07), and 27.3 MT/㏊ ('08) as silage. The number of farm and cultivation area was also increased remarkably. The present research project will be conducted from 2009 to 2010. Forage production and utilization for reduction of feeding cost, and high quality of Hanwoo beef production will investigated, in a manner of cultivation of forage crops mainly IRG, forage barley, IRG+barley mixture and corn.
Kim, Nam-Young,Jang, Min-Kyung,Lee, Dong-Geun,Yu, Ki-Hwan,Jang, Hye-Ji,Kim, Mi-Hyang,Kim, Sung-Gu,Yoo, Byung-Hong,Lee, Sang-Hyeon The Korean Nutrition Society 2010 Nutrition Research and Practice Vol.2 No.4
Flavonoids are known to be effective scavengers of free radicals. In particular, proanthocyanidins are flavonoids that possess cardiovascular protection, antioxidative activities, and immunomodulatory activities. Here, we evaluated proanthocyanidin contents in the total polyphenolic compounds of pine needle extracts prepared by hot water, ethanol, hexane, hot water-hexane (HWH), and hot water-ethanol (HWE). Analysis of each extract indicated that the ethanol extract contained the highest proanthocyanidin concentration. The HWH and hexane extracts also contained relatively high concentrations of proanthocyanidin. On the other hand, proanthocyanidin content analyses out of the total polyphenolic compounds indicated that the HWH extract contained the highest content. These results suggest that HWH extraction is a suitable method to obtain an extract with a high level of pure proanthocyanidins and a relatively high yield. The HWH extract possessed superior activity in diverse antioxidative analyses such as 2,2-diphenyl-1-picrylhydrazyl (DPPH), ferrous ion chelating (FIC), and ferric-ion reducing power (FRAP) assays. In addition, upon assessing the effects of the pine needle extracts on macrophages (Raw 264.7 cell), the HWH extract exhibited the highest activity. In this study, we discerned an efficient extraction method to achieve relatively pure proanthocyanidins from pine needles and evaluated the biological functions of the resulting extract, which could potentially be used for its efficacious components in functional food products.
A New Rice Variety Adaptable to Late Planting with High Quality, "Mananbyeo"
Sang Jong Lim,Jong Rae Kang,Byong Geun Oh,No Bong Park,Un Sang Yeo,Sae Jun Yang,Ho Yeong Kim,Hung Goo Hwang,Yon Cheon Song,Do Yeon Kwark,Woon Goo Ha,Jae Ki Chang,Jeom Sig Lee 한국육종학회 2003 한국육종학회지 Vol.35 No.1
Mananbyeo was developed from a three way cross ilyang110/Yeongdeog7//Milyang110 in 1999. It has short growing duration about 71 days from seeding to heading and short culm length of 75 cm. It has almost similar number of panicles per hill , spikelets per
Atomic Layer Etching Mechanism of MoS<sub>2</sub> for Nanodevices
Kim, Ki Seok,Kim, Ki Hyun,Nam, Yeonsig,Jeon, Jaeho,Yim, Soonmin,Singh, Eric,Lee, Jin Yong,Lee, Sung Joo,Jung, Yeon Sik,Yeom, Geun Young,Kim, Dong Woo American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.13
<P>Among the layered transition metal dichalcogenides (TMDs) that can form stable two-dimensional crystal structures, molybdenum disulfide (MoS2) has been intensively investigated because of its unique properties in various electronic and optoelectronic applications with different band gap.energies from 1.29 to 1.9 eV as the number of layers decreases. To control the MoS2 layers, atomic layer etching (ALE) (which is a cyclic etching consisting of a radical -adsorption step such as Cl adsorption and a reacted -compound -desorption step via a low -energy Ar+ ion exposure) can be a highly effective technique to avoid -inducing damage and contamination that occur during the reactive steps. Whereas graphene is composed of one -atom -thick layers, MoS2 is composed of three-atom-thick S-(top)-Mo-(mid)-S-(bottom) layers; therefore, the ALE mechanisms of the two structures are significantly different In this study, for MoS, ALE, the Cl radical is used as the adsorption species and a low -energy Ar4+ ion is used as the desorption species. A MoS2 ALE mechanism (by which the S-(top), Mo-(mid), and S-(bottom) atoms are sequentially removed from the MoS2 crystal structure due to the trapped Cl atoms between the S-(top) layer and the Mo-(mid) layer) is reported according to the results= of an experiment and a sithulation. In addition, the ALE technique shows that a monolayer MoS2 field effect transistor (FET) fabricated after one cycle of -ALE is undamaged and exhibits electrical characteristics similar to those of a pristine monolayer MoS2 FET. This technique is also applicable to all layered TMD materials, such as tungsten disulfide (WS2), molybdenum diselenide (MoSe2), and tungsten diselenide (WSe2).</P>
Clinical association between serum cholesterol level and the size of xanthelasma palpebrarum
Kim, Young Geun,Oh, Jae Wook,Lee, Keun Cheol,Yoon, Sung Ho Korean Cleft Palate-Craniofacial Association 2022 Archives of Craniofacial Surgery Vol.23 No.2
Background: Xanthelasma palpebrarum (XP) is a benign periorbital lesion. The relationship between xanthelasma lesion size and serum cholesterol levels has been poorly studied. In this study, we investigated this relationship in the context of the clinical etiology of XP. Methods: We retrospectively reviewed medical records and pathology reports of all patients treated for XP at our hospital between June 2014 and June 2021; the data were used to analyze lesion size, underlying disease, serum cholesterol, and disease recurrence. Results: The mean values for patient age, serum cholesterol, and lesion size were 53.0 years, 235.0 mg/dL, and 69.2 mm<sup>2</sup>, respectively. XP mainly occurred in women (64.7%); furthermore, the incidence of XP and lesion size was greatest among patients in their 5th decade of life (41.2%). There was no statistically significant relationship between xanthelasma lesion size and serum cholesterol level. Conclusion: This study compared lesion size with various clinical features in XP patients. In patients who underwent surgery for XP, serum cholesterol levels tended to be higher than those in the general population. However, the trend between the size of XP and serum cholesterol level was unclear. Therefore, if a patient with XP visits the hospital for surgery, it is recommended to check the lipid profile to confirm underlying dyslipidemia regardless of the size.