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Lin, Guo-Lin,Sohn, Mi-Ryeong,Cho, Rae-Kwnag,Hong, Jin-Hwan 한국근적외분광분석학회 2000 Near infrared analysis Vol.1 No.2
The objectives of this study are to discriminate the geographical origin and cultivation years of ginseng based on the near-infrared(NIR) reflectance spectroscopic analysis. Korea and China ginseng samples were prepared for discrimination of geographical origin. 4, 5 and 6 years-old ginseng samples from Korea were prepared for discrimination of cultivation years. Used spectrometer were InfraAlyzer 500, InfraAlyzer 400 and Fiber optic. Sample type of ginseng was 3, whole ginseng radix, slide section and powder type. The accuracy was affected by sample types and instruments. The accuracy for discrimination geographical origin was 97% in calibration model using IA 500 and ginseng powder. For discrimination of cultivation years, the model with slide selection using IA500 were relative accurate. The accuracy was 96.7% for 4-year, 91.3% for 5-year and 89.3% for 6-year old ginseng. The study shows that NIR spectroscopic analysis can be used to discriminate the geographical origin and cultivation years of ginseng with acceptable accuracy.
Guo-Hua Lin,Lin Lin,Hua-Wei Liang,Xin Ma,Jing-Ye Wang,Li-Ping Wu,Hui-Di Jiang,Iain C. Bruce,Qiang Xia 한국식품영양과학회 2010 Journal of medicinal food Vol.13 No.2
The present study evaluated the potential neuroprotective effect and underlying mechanism of the total flavones extracted from Chrysanthemum morifolium (TFCM) against ischemia/reperfusion (I/R) injury. An animal model of cerebral ischemia was established by occluding the right middle cerebral artery for 90 minutes followed by reperfusion for 22 hours. The neurobehavioral scores, infarct area, and hemispheric edema were evaluated. The superoxide dismutase (SOD) activity, malondialdehyde (MDA) content, and reactive oxygen species (ROS) level in brain were also measured. The results showed that pretreatment with TFCM significantly decreased the neurological deficit scores, percentage of infarction, and brain edema and attenuated the decrease in SOD activity, the elevation of MDA content, and the generation of ROS. In isolated brain mitochondria, Ca2+-induced swelling was attenuated by pretreatment with TFCM, and this effect was antagonized by atractyloside. These results showed that pretreatment with TFCM provides significant protection against cerebral I/R injury in rats by, at least in part, its antioxidant action and consequent inhibition of mitochondrial swelling.
Application of Near Spectroscopy for Nondestructive Evaluation of Ginsenoside Content
Lin, Guo-Lin,Cho, Rae-Kwang,Hong, Jin-Hwan 한국근적외분광분석학회 2000 Near infrared analysis Vol.1 No.2
The effective component Ginsenoside in Ginseng has been widely used to cure some hypochondriasis and be as supplementary medicines. There are many chemical analysis methods to measure the contents of Ginsenoside in Ginseng; however, all these methods have some shortcomings such as long time, environmental pollution and damaging the samples. In this paper, it is possible to use near infrared spectroscopy to measure the content of Ginsenoside in Ginseng without destruction. As the results, Rg1, Rb1, Re and T-Saponin of Ginsenoside can be measured with the accuracy of R(0.81) SEP (1.704 mg/g), R(0.74) SEP (1.211 mg/g), R (0.78) SEP (1.049 mg/g) and R(0.84), SEP(4.537 mg/g).
Microfinance Interest Rate Puzzle: Price Rationing or Panic Pricing?
Lin Guo,조호제 한국증권학회 2017 Asia-Pacific Journal of Financial Studies Vol.46 No.2
We examine the relation between microfinance institution (MFI) interest rates, loan loss rates, and regulations. Our results suggest that a positive and causal association exists where loan loss rates drive MFI interest rates after controlling for confounding factors. This positive association holds after accounting for potential endogeneity based on various econometric methods and quasi-natural experiment. Although endogeneity cannot be ruled out fully, the results of our tests suggest it plays a limited role. Our results support the price-rationing proposition that MFIs ration credit and there is unmet demand at the market-clearing price. This positive relation is more pronounced in countries with individualistic and uncertainty avoiding cultures.
Flatbands and Emergent Ferromagnetic Ordering in Fe3Sn2 Kagome Lattices
Lin, Zhiyong,Choi, Jin-Ho,Zhang, Qiang,Qin, Wei,Yi, Seho,Wang, Pengdong,Li, Lin,Wang, Yifan,Zhang, Hui,Sun, Zhe,Wei, Laiming,Zhang, Shengbai,Guo, Tengfei,Lu, Qingyou,Cho, Jun-Hyung,Zeng, Changgan,Zhan American Physical Society 2018 Physical Review Letters Vol.121 No.9
Microfinance Interest Rate Puzzle
Lin Guo,Hoje Jo 한국경영학회 2016 한국경영학회 통합학술발표논문집 Vol.2016 No.8
We examine the relation among microfinance institution (MFI) interest rates, loan loss rates, and regulations. Our results suggest that a positive and causal association exists where loan loss rates drive MFI interest rates after controlling for confounding factors. This positive association holds after accounting for potential endogeneity and reverse causality based on various econometric methods. Although endogeneity cannot be ruled out fully, the results of our tests suggest it plays a limited role. Our results support the price-rationing proposition that MFIs ration credit and there is unmet demand at the market-clearing price, but MFIs know that only entrepreneurs with a higher probability of default will take loans at higher interest rates. In addition, our results suggest that the positive association between MFI interest rates and loan loss rates is more pronounced in countries with individualistic and uncertainty-avoiding cultures as well as in countries with more human capital development.
Experiment study of structural random loading identification by the inverse pseudo excitation method
Guo, Xing-Lin,Li, Dong-Sheng Techno-Press 2004 Structural Engineering and Mechanics, An Int'l Jou Vol.18 No.6
The inverse pseudo excitation method is used in the identification of random loadings. For structures subjected to stationary random excitations, the power spectral density matrices of such loadings are identified experimentally. The identification is based on the measured acceleration responses and the structural frequency response functions. Numerical simulation is used in the optimal selection of sensor locations. The proposed method has been successfully applied to the loading identification experiments of three structural models, two uniform steel cantilever beams and a four-story plastic glass frame, subjected to uncorrelated or partially correlated random excitations. The identified loadings agree quite well with actual excitations. It is proved that the proposed method is quite accurate and efficient in addition to its ability to alleviate the ill conditioning of the structural frequency response functions.
Anisotropic In-plane Resistivity and Magnetoresistance of the Detwinned BaFe2As2
Lin Jiao,Zong Fa Weng,Xue Yan Tang,Lu Kai Guo,Tian Shang,Lin Yang,Hui Qiu Yuan,Yu Ying Wu,Zheng Cai Xia 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.3
We have measured the electrical resistivity and the magnetoresistance of detwinned BaFe2As2single crystals in fields up to 16 Tesla. The temperature dependence of the resistivity shows acounterintuitive anisotropic behavior in the ab-plane, likely arising from the effect of the nematicsusceptibility. Little magnetoresistance is observed at temperatures above the structural/magnetictransition, below which a huge in-plane magnetoresistance with an anisotropy is detected.