Desertification monitoring by LANDSAT TM satellite imagery

Guishan Cui,이우균,곽두안,최성호,박태진,이종열 한국산림과학회 2011 Forest Science And Technology Vol.7 No.3

The desertification tendency of the Qubqi Desert in China for 10 years was investigated using vegetation and soil change indices extracted from seven LANDSAT TM images. To identify the desertification tendency, two methods were applied. In the first, the desertification extent and tendency were determined by classifying the land cover into the following four categories using the Normalized Difference Vegetation Index (NDVI): floating desert area, halffixed sand area, fixed sand area, and grassland. In the second, the degree of desertification was classified using the Modified Soil Adjusted Vegetation Index (MSAVI): primitive state, latent state, slight desertification, medium desertification, and high-degree desertification. The study results demonstrated that expansion of desertification was mostly clear in the eastern Qubqi and the neighboring farming land area.

청정개발체제하 재 조림 사업의 토지적격성에 대한 사례 분석 ?고성군 재조림 사업을 중심으로?

( Cui Guishan ),권태협 ( Tae Hyub Kwon ),이우균 ( Woo Kyun Lee ),곽한빈 ( Han Bin Kwak ),남기준 ( Ki Jun Nam ),송용효 ( Yong Ho Song ),( Yu Hangnan ) 한국산림과학회 2013 한국산림과학회지 Vol.102 No.2

For reducing greenhouse gases, many countries carried out a series of activities not only at home but abroad. Particularly, after the release of the Kyoto Protocol, either nation or companies` participation was intensified, due to endow to responsibility of emission limits. This study focused on reforestation CDM work in Goseong Gun based on clean development system. Obstacle factors of land eligibility could be distinguished to three periods: before December 31th 1989, present and future. The obstacle before December 31th 1989 was that land cover of study area hardly illustrated by Landsat image, due to the low resolution, which were confirmed by a document of Grassland Composition Permission instead. The problem of current land eligibility is that the area of trees presence are difficult to be determined as forest or not. The boundary of forest in strata was identified, using 3-Dimensional Cartography Machine and aerial photograph. Land eligibility would still have obstacle whether the study area with trees presence has potentiality to be forest in the future at situation in absence of reforestation project. This was resolved by prediction of tree growth using stem analysis during execution of the project at study area.

LiDAR 자료를 이용한 산림의 층화분석

( Cui Guishan ),박태진,이우균,이종열 한국임학회 2012 산림과학 공동학술대회 논문집 Vol.2012 No.-

Estimation of Forest Carbon Budget from Land Cover Change in South and North Korea between 1981 and 2010

Cui, Guishan,Lee, Woo-Kyun,Kim, Damin,Lee, Eun Jung,Kwak, Hanbin,Choi, Hyun-Ah,Kwak, Doo-Ahn,Jeon, Seongwoo,Zhu, Weihong 한국식물학회 2014 Journal of Plant Biology Vol.57 No.4

This paper quantified carbon budget in the past 30 years (1981-2010) and identified the impact of land cover change on carbon dynamics using vegetation integrated simulator for trace gases (VISIT) model. North Korea was converted from carbon sink to source with $10.72{\pm}5.18TgCyr^{-1}$ of net ecosystem production (NEP) in the 1980s, $3.00{\pm}7.96TgCyr^{-1}$ in the 1990s, and $-0.46{\pm}5.13TgCyr^{-1}$ in the 2000s. NEP in South Korea was $10.55{\pm}1.09TgCyr^{-1}$ in the 1980s, $10.47{\pm}7.28TgCyr^{-1}$ in the 1990s, and $6.32{\pm}5.02TgCyr^{-1}$ in the 2000s, showing a gradual decline. In North Korea, NEP was decreased by $0.52Tgyr^{-1}$ in the 1990s due to reduction of forest, and increased by $0.36Tgyr^{-1}$ in the 2000s due to expansion of cropland. In South Korea, it was decreased by $0.24Tgyr^{-1}$ in the 1990s as urban and built-up area expanded, and increased by $0.04Tgyr^{-1}$ in the 2000s with the expansion of forest. These results suggest the importance of forest and land cover management against deforestation for ensuring national carbon balance.

Assessing vulnerability of forests to climate change in South Korea

Cui, Guishan,Kwak, Hanbin,Choi, Sungho,Kim, Moonil,Lim, Chul-Hee,Lee, Woo-Kyun,Kim, Joon-Soon,Chae, Yeora SPRINGER SCIENCE + BUSINESS MEDIA 2016 JOURNAL OF FORESTRY RESEARCH Vol. No.

<P>This study demonstrated a framework to assess vulnerability of forests to climate change. We focused on how alterations of temperature and precipitation might affect forest type distributions and carbon-related functions. In particular, our framework considered three sectors of forest type distribution, net primary production, and soil carbon storage. Future projections were derived from mechanistic models for South Korean forests under the A1B scenarios of the intergovernmental panel on climate change. Forest type distributions were simulated by the Hydrological and thermal analogy group model, while the MAPSS and CENTURY1 models estimated forest carbon flux/storage. We quantified normalized vulnerability indices for each sector. Our results indicate that the overall vulnerability of forest type distribution is greater in the west central regions and southeastern inlands. The vulnerabilities of carbon flux/storage show that net primary production of South Korean forests is relatively less susceptible to climate change, but a highly vulnerable area of soil carbon storage mainly spreads from the west central to the south east region. The spatio-temporal vulnerability map with a synoptic overview from this study might be useful for policy makers in preparing adaptive measures and identifying management priorities.</P>

Multistep Controllability Synthesis and Growth Mechanism of ZnO Nanopagoda for Schottky Diode Device

Yang Liu,Guishan Liu,Yongbing Wang,Wenyuan Gao,Hongshun Hao,Bopu Huang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2016 NANO Vol.11 No.2

Ordered ZnO arrays with a peculiar nanostructure were synthesized by a multistep synthesis process. The first step was the preparation of ZnO seed to induce the formation of ZnO array via potentiostatic electrodeposition method using a typical three electrode set-up. The second step was fabricating ZnO array along seed by Chemical Bath Deposition. Structural analysis of ZnO was carried out with X-ray diffraction (XRD), which showed a hexagonal wurtzite structure, and the selected area electron diffraction (SAED) patterns indicated that nanocrystalline is a part of monocrystal. The scanning electron microscope (SEM) and transmission electron microscope (TEM) were used to study the microstructure, and showed a pagoda-like microstructure with a tiny top and large bottom, which had an average top diameter of exceeding 800 nm at seeddepositing time of 60 s, and then growth mechanisms are subsequently given a further explanation, viewed from kinetics and thermodynamics. In addition, the current–voltage curves of schottky diode devices with ZnO nanopagoda arrays revealed that ZnO films arrays along grown ZnO seed had a higher reverse saturation current than ZnO films grown without seed, which are 1.48 x 10-6 A and 1.32 x 10-8 A, respectively. The minimum turn-on voltage of the diode with ZnO seed deposited 60 s is 0.18 V, without seed is 0.52 V.

BAIAP2L2 facilitates the malignancy of prostate cancer (PCa) via VEGF and apoptosis signaling pathways

Yuanzi Song,Guishan Zhuang,Jiazhen Li,Mingqing Zhang 한국유전학회 2021 Genes & Genomics Vol.43 No.4

Background Prostate cancer (PCa) is the second most common type of male cancer in western. Despite key roles of brainspecifc angiogenesis inhibitor 1-associated protein like 2 (BAIAP2L2) in several cancers, the function of BAIAP2L2 in PCa is never reported. Objective We aimed to investigate the role of BAIAP2L2 in the progression of PCa and decipher the underlying mechanisms. Methods RNA sequencing data from TCGA database were used to evaluate the expression of BAIAP2L2 in PCa. Survival analysis and Cox regression model analysis were conducted to evaluate the prognostic value of BAIAP2L2. BAIAP2L2- associated pathways were preliminary analyzed by Gene Set Enrichment Analysis (GSEA) method and confrmed by western blot assays. Cell proliferation and transwell assays were performed to determine biological behaviors in BAIAP2L2 knockeddown or overexpressed PCa cell lines including LNCaP and PC-3 cells. Results In our study, BAIAP2L2 was signifcantly up-regulated in PCa tissues and cell lines and independently associated with the poor prognosis of PCa patients. Knockdown of BAIAP2L2 notably repressed proliferation, migration and invasion of PCa cells. And overexpression of BAIAP2L2 obtained the contrary results. Mechanically, GSEA method and western blot results of key molecules in signaling pathways implicated that the depletion of BAIAP2L2 inactivated the vascular endothelial growth factors (VEGFs) and induced apoptosis signaling pathways in PCa cells. Conclusions Overall, these fndings revealed that BAIAP2L2 may support tumorigenesis and malignant development of prostate cancer cells via VEGF and apoptosis signaling pathways, and it could be considered as a promising biomarker and independent prognostic predictor of prostate cancer.

Net Phosphorus Requirements of Dorper×Thin-tailed Han Crossbred Ram Lambs

Ji, Shoukun,Xu, Guishan,Jiang, Chenggang,Deng, Kaidong,Tu, Yan,Zhang, Naifeng,Ma, Tao,Lou, Can,Diao, Qiyu Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.9

A comparative slaughter trial was conducted to estimate the phosphorus (P) requirement for maintenance and growth of crossbred lambs of Dorper with a Chinese indigenous sheep breed, thin-tailed Han sheep. Thirty-five Dorper${\times}$thin-tailed Han crossbred, noncastrated ram lambs ($20.3{\pm}0.22kg$ of shrunk body weight (SBW)) were used. Seven lambs were randomly chosen and slaughtered at 20 kg SBW as the baseline group for measuring initial body composition. Another seven lambs were also randomly chosen and offered a pelleted mixed diet for ad libitum intake and slaughtered at 28 kg SBW. The remaining 21 sheep were randomly divided into 3 groups with 7 sheep each and subject to the same diet of either 70 or 40% of ad libitum intake. The 3 groups were slaughtered when the sheep fed ad libitum reached 35 kg of SBW. Body P contents were determined after slaughter. The results showed that the net P requirement for maintenance was 30.0 mg/kg of empty body weight (EBW) or 23.4 mg/kg body weight (BW), and the P requirement for growth decreased from 5.3 to 5.0 g/kg of EBW gain as the lamb grew from 20 to 35 kg. The net P requirement for growth of Dorper${\times}$thin-tailed Han crossbred ram lambs was lower than that of sheep adopted by the American nutritional system.

Low-Cost Flexible Strain Sensor Based on Thick CVD Graphene

Bailiang Chen,Ying Liu,Guishan Wang,Xianzhe Cheng,Guanjun Liu,Jing Qiu,Kehong Lv 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.11

Flexible strain sensors, as the core member of the family of smart electronic devices, along with reasonable sensing range and sensitivity plus low cost, have rose a huge consumer market and also immense interests in fundamental studies and technological applications, especially in the field of biomimetic robots movement detection and human health condition monitoring. In this paper, we propose a new flexible strain sensor based on thick CVD graphene film and its low-cost fabrication strategy by using the commercial adhesive tape as flexible substrate. The tensile tests in a strain range of ~30% were implemented, and a gage factor of 30 was achieved under high strain condition. The optical microscopic observation with different strains showed the evolution of cracks in graphene film. Together with commonly used platelet overlap theory and percolation network theory for sensor resistance modeling, we established an overlap destructive resistance model to analyze the sensing mechanism of our devices, which fitted the experimental data very well. The finding of difference of fitting parameters in small and large strain ranges revealed the multiple stage feature of graphene crack evolution. The resistance fallback phenomenon due to the viscoelasticity of flexible substrate was analyzed. Our flexible strain sensor with low cost and simple fabrication process exhibits great potential for commercial applications.

Lycium barbarum Polysaccharide Inhibits Lipid Oxidation and Protein Degradation in Tan Sheep Meatballs during Frozen Storage

Jiangyong Yu,Mei Guo,Guishan Liu,Jingjing Zhang,Naiyun Fan,Xiaorui Li,Yourui Sun,Jiangtao Yuan,Rui Huang 한국축산식품학회 2022 한국축산식품학회지 Vol.42 No.4

The aim of the present study was to evaluate the effectiveness of Lycium barbarum polysaccharide (LBP) on lipid oxidation and protein degradation in Tan sheep meatballs during the frozen period. The meatballs were treated with LBP at 0.01%, 0.02%, and 0.03% and stored at –18±1℃ for 0, 3, 6, 9, and 12 weeks. The effects of LBP treatment were investigated using the contents of total volatile basic nitrogen (TVB-N), texture profile (TP), thiobarbituric acid reactive substances (TBARS), colour, and pH values, compared with 0.02% butylated hydroxytoluene treatment and the blank control. The results showed that LBP treatment significantly decreased TBARS content compared with the control, which confirmed LBP to be a highly effective component in preventing lipid oxidation of Tan sheep meatballs during frozen storage, and protein degradation in Tan sheep meatballs had a significant inhibition effect because of TVB-N value reduction. In addition, the colour, TP and pH values of meatballs treated with LBP were improved dramatically. To further determine the quality changes of the blank control and all treated groups during storage, the comprehensive score evaluation equation based on principal component analysis was obtained: Y=0.51632Y1+0.29589Y2 (cumulative contribution rate=81.221%), and the 0.02% LBP-treated group had a higher comprehensive score than the other groups, and the quality of LBP-treated meatballs was better as well. In summary, LBP may reduce or inhibit lipid oxidation and protein degradation, and enhance overall quality and shelf-life in prepared meat products.