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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.
Longitudinal associations between glucocorticoid receptor methylation and late-life depression
Kang, Hee-Ju,Bae, Kyung-Yeol,Kim, Sung-Wan,Shin, Il-Seon,Kim, Hye-Ran,Shin, Myung-Geun,Yoon, Jin-Sang,Kim, Jae-Min Elsevier 2018 Progress in neuro-psychopharmacology & biological Vol.84 No.1
<P><B>Abstract</B></P> <P>It has been suggested that hypothalamus–pituitary–adrenal (HPA) axis dysregulation plays a role in the etiology of depression. HPA axis function is mediated by glucocorticoid receptors (GRs), which are influenced by epigenetic mechanisms (DNA methylation). The association between the DNA methylation of the GR gene (nuclear receptor subfamily 3, group C, member 1; <I>NR3C1</I>) and late-life depression as well as the role of <I>NR3C1</I> methylation in the prediction of the incidence of depression have not yet been investigated. Therefore, we examined the independent and longitudinal effects of the methylation of three CpG sites in exon 1<SUB>F</SUB> of <I>NR3C1</I> on late-life depression using peripheral blood. In total, 732 Korean community residents aged ≥65 years were assessed; 521 individuals in this group without depression at baseline were followed 2 years later. The Geriatric Mental State Schedule was used to identify depression, and demographic and clinical covariates were evaluated. The effects of <I>NR3C1</I> methylation (the individual methylation status of three CpG sites and their average values) on current and follow-up depression were calculated using a multivariate logistic regression model. Higher <I>NR3C1</I> methylation levels at CpG 2 and 3 and the average methylation value were independently associated with the prevalence of depression at baseline. Additionally, a higher <I>NR3C1</I> methylation level at CpG 2 was associated with depression incidence 2 years later in this population. These findings suggest an association between the methylation of <I>NR3C1</I> exon 1<SUB>F</SUB>, especially at CpG 2, and depression later in life.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Higher <I>NR3C1</I> exon 1<SUB>F</SUB> methylation, except at CpG 1, is related to prevalence of late life depression. </LI> <LI> Hypermethylation of <I>NR3C1</I> exon 1<SUB>F</SUB> at CpG 2 predicts depression incidence 2 years later. </LI> <LI> These associations were independent of potential covariates. </LI> <LI> Altered epigenetic regulation in the HPA axis in late-life depression was supported. </LI> </UL> </P>
Fabrication and Thermal Analysis of Wafer-Level Light-Emitting Diode Packages
Kang, Jeung-Mo,Choi, Jeong-Hyeon,Kim, Du-Hyun,Kim, Jae-Wook,Song, Yong-Seon,Kim, Geun-Ho,Han, Sang-Kook IEEE 2008 IEEE electron device letters Vol.29 No.10
<P> Wafer-level packaged light-emitting diodes (LEDs) are useful for the high-power applications such as back light unit and general solid-state lighting due to the compactness and integrated fabrication process. In this letter, wafer-level packaged LEDs with red, green, and blue multichips were fabricated, and the thermal characteristics of wafer-level packaged LEDs with multichips such as thermal resistance and junction temperature are investigated using both serial and matrix measurement methods. </P>
Kang, Sang-Jun,Kim, Ki-Joong,Chung, Min-Chul,Jung, Sang-Chul,Boo, Su-Il,Cho, Soon Kye,Jeong, Woon-Jo,Ahn, Ho-Geun American Scientific Publishers 2011 Journal of Nanoscience and Nanotechnology Vol.11 No.2
<P>Nanosized TiO2 thin film on the substrate such as stainless steel plate and slide glass film were prepared by magnetron sputtering method, and these TiO2 thin films were characterized by field emission-scanning electron microscopy (FE-SEM). Photocatalytic activity for Methyl-ethyl-ketone (MEK) and acetaldehyde were measured using a closed circulating reaction system through the various ultra violet (UV) sources. From the results of SEM images, nanosized TiO2 thin film was uniformly coated on slide glass, ranging from 360 nm to 370 nm. Photocatalytic activity of MEK over TiO2 thin film on stainless steel plate did not occur by UV-A irradiation, but was efficiently decomposed by UV-B and UV-C. Also, acetaldehyde could be decomposed than MEK. The effect of sputtering conditions on their structure and photocatalytic activities were investigated in detail.</P>
Sung, Jinwoo,Huh, June,Choi, Ji‐,Hyuk,Kang, Seok Ju,Choi, Yeon Sik,Lee, Geun Tak,Cho, Junhan,Myoung, Jae‐,Min,Park, Cheolmin WILEY‐VCH Verlag 2010 Advanced Functional Materials Vol.20 No.24
<P><B>Abstract</B></P><P>Ultrathin composite films consisting of mixtures of metallic (m‐) and semiconducting (s‐) single‐walled carbon nanotubes (SWNTs) with a conjugated block copolymer are developed from a solution‐based process. The electronic properties of the films are precisely controlled from metallic to semiconducting to insulating. The tunability of the electronic composite sheets is mainly attributed to (1) the efficient dispersion of SWNTs with a conjugated block copolymer in solution, (2) the control of the number of nanotubes by centrifugation, and (3) the individually networked deposition of SWNTs embedded in the conjugated block copolymer on the target substrate by spin‐coating. A highly reliable field‐effect transistor with a networked composite film is realized with a specific range of tube density and a high on/off current ratio of approximately 10<SUP>6</SUP> which resulted from the Schottky barriers evolved between the individual m‐ and s‐SWNTs in the network. There is also great freedom when choosing both the gate dielectrics and source‐drain electrodes for transistors containing the composite films. Furthermore, the fabricated electronic composites are highly transparent, flexible, and chemically robust and thus, they can be conveniently micropatterned by photolithography, as well as by unconventional transfer printing techniques.</P>
The Prevalence of Human Papilloma Virus Infections According to Pap Smear Results in Jeju Island
( Geun Hwa Lee ),( Ho Jeong Kang ),( Sung Yob Kim ),( Chul Min Park ) 대한산부인과학회 2011 Obstetrics & Gynecology Science Vol.54 No.11
Objective We analyzed subtypes of human papilloma virus (HPV) infection in Papanicolaou (Pap) smear results of women in Jeju island, Korea. Methods We investigated the distribution of HPV subtypes according to Pap smear results among 635 women in Jeju island, Korea between October 2005 and October 2010. Results The most prevalent HPV subtypes were HPV 16, 52, 53, 58 in negative Pap smear result and HPV 16, 52, 31, 53, 66 in atypical squamous cell, HPV 52, 53, 56, 66 in low grade squamous intraepithelial lesion, HPV 16, 58, 52, 33, 33 in high grade squamous intraepithelial lesion/squamous cell carcinoma each other. The subtypes of HPV 16, 52, 53, 58, 31 were common in all women participated in study from Jeju island, Korea. And multiple infections were more common in women under 30 years of age than above age as previous study and the majority of HPV multiple infections were high risk types (94.5%). Conclusion This prevalence was some different from previous study of Korean other region, but more similar to Japanese study data. We think this result shows that Jeju island women maybe have the genetic, regional or environmental close relationship with Japanese because of close distance and culture irrespective of different national race.
Kang, Narae,Park, Ji Hoon,Choi, Jaewon,Jin, Jaewon,Chun, Jiseul,Jung, Il Gu,Jeong, Jaehong,Park, Je‐,Geun,Lee, Sang Moon,Kim, Hae Jin,Son, Seung Uk WILEY‐VCH Verlag 2012 Angewandte Chemie Vol.124 No.27
<P><B>Röhren aus Röhren</B>: Mikroporöse organische Nanoröhren wurden durch Sonogashira‐Kupplung zwischen Tetra(4‐ethinylphenyl)methan und <I>N</I>,<I>N</I>′‐Di(4‐iodphenyl)‐4,4′‐bipyridiniumdichlorid erhalten. Diese Nanoröhren dienten als Template für sekundäre anorganische Materialien, nämlich Fe<SUB>2</SUB>O<SUB>3</SUB>‐Nanoröhren mit hoher Entladekapazität und ausgezeichneter Stabilität.</P>
Kang, Hee-Sung,Ahn, Chang-Geun,Lee, Seok-Ha,Kim, Kwang-Il,Bae, Young-Ho,Kwon, Young-Kyu,Kang, Bongkoo 위덕대학교 부설 전자기술연구소 1997 전자기술연구소 논문집 : 위덕대 Vol.1 No.1
An optical measurement is desired for reliable wafer-scale measurement of crystalline defects in a silicon-on-insulator (SOI) layer. Using a oxygen-implanted SOI layer, a chemical wet etching technique based on the three step etch pit transfer method has been investigated to form etch pits of appropriate size for reliable wafer-scale optical measurement of the defects in the SOI layer. The etch steps consist of a SOI etching with a dilute Wright etching solution, a buried oxide (BOX) etching with a hydrofluoric acid solution, and a substrate silicon etching with the standard Wright etching solution. To find an optimum condition for optical measurement of defect density, etching conditions are varied to enlarge the etch pits to an optimum size. The densities of magnified etch pits are measured with an automatic optical image analyzer, and the results agree well with the defect density observed by cross-sectional transmission electron microscope (TEM).