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Surface-area-tuned, quantum-dot-sensitized heterostructured nanoarchitectures for highly efficient photoelectrodes

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Nano Research 2014年第1期7卷 144-153页

作者： Sangbaek Park Donghoe kim Chan Woo Lee Seong-Deok Seo hae Jin kim Hyun Soo Han Kug Sun Hong Dong-Wan kim Department of Materials Science and Engineering Seoul National University Seou1151-744 Republic of Korea Department of Energy Systems Research and Department of Materials Science and Engineering Ajou University Suwon 443-749 Republic of Korea

Harvesting solar energy to produce clean hydrogen from photoelectrolysis of water presents a valuable opportunity to find alternatives for fossil fuels. Three- dimensional nanoarchitecturing techniques can afford enhanced photoelectrochemical properties by improving geometrical and structural effects. Here, we report quantum-dot sensitized TiO2-Sb：SnO2 heterostructures as a model electrode to enable the optimization of the structural effects through the creation of a highly conductive pathway using a transparent conducting oxide （TCO）, coupled with a high surface area, by introducing branching and low interfacial resistance via an epitaxial relationship. An examination of various morphologies （dot, rod, and lamella shape） of TiO2 reveals that the rod-shaped TiO2-Sb：SnO2 is a more effective structure than the others. A photoelectrode fabricated using optimized CdS--TiO2-Sb：SnO2 produces a photocurrent density of 7.75 mA/cm2 at 0.4 V versus a reversible hydrogen electrode. These results demonstrate that constructing a branched heterostructure based on TCO can realize highperformance photoelectrochemical devices.

关键词： photoelectrochemical hydrogen evolution antimony-doped tinoxide TiO2 quantum dot

The plant Mediator and its role in noncoding RNA production

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Frontiers in Biology 2011年第2期6卷 125-132页

作者： yun Ju kim Xuemei CHEN Department of Botany and Plant Sciences and Institute of Integrative Genome Biology University of CaliforniaRiversideCA 92521USA

Mediator,a conserved multiprotein complex in animals,plants,and fungi,is a cofactor of RNA polymerase II(Pol II).It is known to promote basal Pol II-mediated transcription as well as bridge sequence-specific transcriptional regulators and Pol II to integrate regulatory *** II transcribes not only protein-coding genes but also intergenic regions to generate noncoding RNAs such as small RNAs(microRNAs and small interfering RNAs)and long noncoding ***,two plant-specific polymerases,Pol IV and Pol V,have evolved from Pol II and play a role in the production of small interfering RNAs and long noncoding RNAs at heterochromatic regions to maintain genome stability through transcriptional gene silencing(TGS).Recent studies have defined the composition of the plant Mediator and evaluated its role in noncoding RNA production in relationship to Pol II,Pol IV and Pol ***,we review the functions of Mediator and that of noncoding RNAs generated by Pol II,Pol IV and Pol V in plants,and discuss a role of Mediator in epigenetic regulation via noncoding RNA production.

关键词： small RNA noncoding RNA Mediator Pol II Pol IV Pol V

Relief of YAP-mediated inhibition by IKKε promotes innate antiviral immunity

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Cellular & Molecular Immunology 2018年第6期15卷 642-644页

作者： Nayoung kim yun-Yong Park Chul Hyun Joo Hun Sik kim Department of Convergence Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Asan Institute for Life Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Microbiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea Department of Biomedical Sciences Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505Korea

The innate immune response to invading viruses is critical for the mounting of protective immunity,in which type I interferons(IFN),for example,IFN-αandβ,are potent effector molecules.1 Most cell types,particularly fibroblasts and epithelial cells,produce IFN-β,whereas hematopoietic cells,notably plasmacytoid dendritic cells,are the predominant sources of IFN-α.IFNs potently stimulate a variety of innate and adaptive immune cells,including macrophages,NK cells and T *** binding of type I IFN to its cognate receptor triggers the activation of the Janus kinase signal transducer and activator of transcription pathway,which results in the transcription of IFNstimulated genes that play key roles in host resistance to viral infections.

关键词： immunity protective mount

Bootstrap generated confidence interval for time averaged measure

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International Journal of Modeling, Simulation, and Scientific Computing 2015年第3期6卷 107-115页

作者： Jinsoo Park Haneul Lee yun Bae kim School of Management and Administration Yong In University YonginRepublic of Korea School of Engineering Sungkyunkwan University SuwonRepublic of Korea

In the simulation output analysis,there are some measures that should be calculated by time average concept such as the mean queue ***,the confidence interval of those measures might be required for statistical *** this situation,the traditional method that utilizes the central limit theorem(CLT)is inapplicable if the output data set has autocorrelation *** bootstrap is one of the most suitable methods which can reflect the autocorrelated phenomena in statistical ***,the confidence interval for a time averaged measure having autocorrelation structure can also be calculated by the bootstrap *** study introduces the method that constructs these confidence intervals applying the *** bootstraps proposed are the threshold bootstrap(TB),the moving block bootstrap(MBB)and stationary bootstrap(SB).Finally,some numerical examples will be provided for verification.

关键词： Simulation output analysis confidence interval time averaged measure bootstrap

Anticancer effects of oligomeric proanthocyanidins on human colorectal cancer cell line, SNU-C4

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World Journal of Gastroenterology 2005年第30期11卷 4674-4678页

作者： Youn-Jung kim hae-Jeong Park Seo-Hyun Yoon Mi-Ja kim Kang-Hyun Leem Joo-Ho Chung Hye-Kyung kim Department of Dental Hygiene Department of Pharmacology Department of Obesity Management College of Oriental Medicine Department of Food and Biotechnology

AIM: Oligomeric proanthocyanidins (OPC), natural polyphenolic compounds found in plants, are known to have antioxidant and anti-cancer effects. We investigated whether the anti-cancer effects of the OPC are induced by apoptosis on human colorectal cancer cell line, ***: Colorectal cancer cell line, SNU-C4 was cultured in RPMI 1640 medium supplemented with 10% fetal bovine serum. The cytotoxic effect of OPC was assessed by 3-(4, 5-dimethylthiazol-2-yl)-2, 5-diphenylt-etrazolium bromide (MTT) assay. To find out the apoptotic cell death, 4, 6-diamidino-2-phenylindole (DAPI) staining,terminal deoxynucleotidyl transferase (TdT)-mediated dUTP nick end labeling (TUNEL) assay, reverse transcriptionpolymerase chain reaction (RT-PCR), and caspase-3 enzyme assay were ***: In this study, cytotoxic effect of OPC on SNUC4 cells appeared in a dose-dependent manner. OPC treatment (100 μg/mL) revealed typical morphological apoptotic features. Additionally OPC treatment (100 μg/mL)increased level of BAX and CASPASE-3, and decreased level of BCL-2 mRNA expression. Caspase-3 enzyme activity was also significantly increased by treatment of OPC (100 μg/mL) compared with ***: These data indicate that OPC caused cell death by apoptosis through caspase pathways on human colorectal cancer cell line, SNU-C4.

关键词： Oligomeric pranthocyanidins Apoptosis Anticancer effects Colorectal cancer

Characteristics of environmental factors associated with typhoon Kongrey(1825) over the Eastern Coastal Region of Korea

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Tropical Cyclone Research and Review 2020年第3期9卷 162-171页

作者： So-Ra In Baek-Jo kim hae-Min kim Chang-Geun Park High Impact Weather Research Center Observation and Forecast Research DivisionNational Institute of Meteorological SciencesKMASouth Korea

In this study,the characteristics of environmental factors associated with typhoon Kongrey were examined using radiosonde,wind-profiler,radar,and Automated Surface Observing System(ASOS)data in Uljin,which is located the eastern coast of *** radiosonde data were obtained from intensive observation between 1500 LST 5 to 0000 LST 7 October *** factors such as Total Precipitable Water(TPW)and Strom Relative Environmental Helicity(SREH)were selected to examine their relations to typhoon-accompanied *** TPW peak with 60.54 mm appeared at 1200 LST 6 October,which is 6 h after the peak of typhoon *** was found that the TPW variation is largely associated with the effect of water vapor supply from the typhoon with nearest proximity to Uljin at 1500 LST 6 *** SREH,which indicates mechanical instability,was 761 m2 s-2 during the period in which typhoon precipitation *** environments would provide a good condition for the development of super-cell storms,causing heavy precipitation associated with *** addition,it was found that the correlation coefficient between SREH and typhoon rainfall is 0.8(p-value=0.02).

关键词： Typhoon Kongrey Precipitation TPW SREH

Endoplasmic reticulum stress-induced accumulation of VAMP721/722 requires CALRETICULIN 1 and CALRETICULIN 2 in Arabidopsis

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Journal of Integrative Plant Biology 2019年第9期61卷 974-980页

作者： Soohong kim yunjin Choi Chian Kwon Hye Sup yun Department of Molecular Biology Dankook UniversityCheonan 31116Korea Department of Biological Sciences Konkuk UniversitySeoul 05029Korea

Excessive demand for translation and protein folding in the endoplasmic reticulum(ER) can cause ER stress in plants. Here, we show that CALRETICULIN 1(CRT1) and CRT2 are critical components in the accumulation of VESICLE-ASSOCIATED MEMBRANE PROTEIN 721(VAMP721) and VAMP722 during ER stress responses. We show that CRT2 interacts with VAMP722 and that CRT1/2 post-translationally maintain elevated VAMP721/722 levels under ER *** greater growth inhibition in VAMP721/722-deficient plants, induced by tunicamycin, suggests that plants under ER stress maintain physiological homeostasis, at least in part, by regulating VAMP721/722 levels, as VAMP721/722 are known to participate in various biological processes.

关键词： Endoplasmic reticulum VAMP721/722 in Arabidopsis

Semi-Supervised Learning with Generative Adversarial Networks on Digital Signal Modulation Classification

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Computers, Materials & Continua 2018年第5期55卷 243-254页

作者： Ya Tu yun Lin Jin Wang Jeong-Uk kim College of Information and Communication Engineering Harbin Engineering UniversityHarbin 150001China School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha 410114China School of Information Engineering Yangzhou UniversityYangzhou 225009China Department of Energy Grid Sangmyung UniversitySeoulKorea

Deep Learning(DL)is such a powerful tool that we have seen tremendous success in areas such as Computer Vision,Speech Recognition,and Natural Language *** Automated Modulation Classification(AMC)is an important part in Cognitive Radio Networks,we try to explore its potential in solving signal modulation recognition *** cannot be overlooked that DL model is a complex model,thus making them prone to *** model requires many training data to combat with over-fitting,but adding high quality labels to training data manually is not always cheap and accessible,especially in real-time system,which may counter unprecedented data in ***-supervised Learning is a way to exploit unlabeled data effectively to reduce over-fitting in *** this paper,we extend Generative Adversarial Networks(GANs)to the semi-supervised learning will show it is a method can be used to create a more dataefficient classifier.

关键词： Deep Learning automated modulation classification semi-supervised learning generative adversarial networks

Impact of UV-A Radiation on Erythemal UV and UV-index Estimation over Korea

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Advances in Atmospheric Sciences 2015年第12期32卷 1639-1646页

作者： Sang Seo PARK yun Gon LEE Jung Hyun kim Department of Atmospheric Sciences Yonsei University Department of Atmospheric Sciences Chungnam National University

Because total UV （TUV） in the UV-A region is 100 times higher than in the UV-B region, UV-A is a considerable compo- nent when calculating erythemal UV （EUV） and UV-index. The ratio of EUV to TUV in the UV-A value [EUV（A）/TUV（A）] is investigated to convert the EUV（A） from TUV（A） for broadband observation. The representative value of EUV（A）/TUV（A）, from the simulation study, is 6.9 × 10^- 4 changing from 6.1 ×10^-4 to 7.0 × 10^ -4 as aerosol optical depth, total ozone and solar zenith angle change. By adopting the observational data of EUV（B） and TUV（A） from UV-biometer measurements at Yonsei University [（37.57°N, 126.95°E）, 84 m above sea level], the EUV irradiance increases to 15% of EUV（B） due to the consideration of EUV（A） from the data of TUV（A） observation. Compared to the total EUV observed from the Brewer spec- trophotometer at the same site, the EUV（B） from the UV-biometer observes only 95% of total EUV, and its underestimation is caused by neglecting the effect of UV-A. However, the sum of EUV（B） and EUV（A） [EUV（A＋B）] from two UV-biometers is 10% larger than the EUV from the Brewer spectrophotometer because of the spectral overlap effect in the range 320-340 nm. The correction factor for the overlap effect adjusts 8% of total EUV.

关键词： erythemal UV total UV UV-B UV-biometer