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International Journal of Digital Earth 2013年第4期6卷 383-403页

作者： ick-hoi kim Ming-Hsiang Tsou Department of Geography San Diego State UniversitySan DiegoCAUSA

Geospatial simulation models can help us understand the dynamic aspects of Digital *** implement high-performance simulation models for complex geospatial problems,grid computing and cloud computing are two promising computational *** research compares the benefits and drawbacks of both in Web-based frameworks by testing a parallel Geographic Information System(GIS)simulation model(Schelling’s residential segregation model).The parallel GIS simulation model was tested on XSEDE(a representative grid computing platform)and Amazon EC2(a representative cloud computing platform).The test results demonstrate that cloud computing platforms can provide almost the same parallel computing capability as high-end grid computing ***,cloud computing resources are more accessible to individual scientists,easier to request and set up,and have more scalable software architecture for on-demand and dedicated Web *** advantages may attract more geospatial scientists to utilize cloud computing for the development of Digital Earth simulation models in the future.

关键词： grid computing cloud computing parallel computing simulation model geospatial cyberinfrastructure

Mapping ideas from cyberspace to realspace: visualizing the spatial context of keywords from web page search results

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International Journal of Digital Earth 2014年第4期7卷 316-335页

作者： Ming-Hsiang Tsou ick-hoi kim Sarah Wandersee Daniel Lusher Li An Brian Spitzberg Dipak Gupta Jean Mark Gawron Jennifer Smith Jiue-An Yang Su Yeon Han Department of Geography San Diego State UniversitySan DiegoCAUSA School of Communication San Diego State UniversitySan DiegoCAUSA Department of Political Science San Diego State UniversitySan DiegoCAUSA Department of Linguistics and Oriental Languages San Diego State UniversitySan DiegoCAUSA Department of Geography Pennsylvania State UniversityUniversity ParkPAUSA

We introduce a new method for visualizing and analyzing information landscapes of ideas and events posted on public web pages through customized web-search engines and *** research integrates GIScience and web-search engines to track and analyze public web pages and their web contents with associated spatial *** pages searched by clusters of keywords were mapped with real-world coordinates(by geolocating their Internet Protocol addresses).The resulting maps represent web information landscapes consisting of hundreds of populated web pages searched by selected *** creating a Spatial Web Automatic Reasoning and Mapping System prototype,researchers can visualize the spread of web pages associated with specific keywords,concepts,ideas,or news over time and *** maps may reveal important spatial relationships and spatial context associated with selected *** approach may provide a new research direction for geographers to study the diffusion of human thought and ideas.A better understanding of the spatial and temporal dynamics of the‘collective thinking of human beings’over the Internet may help us understand various innovation diffusion processes,human behaviors,and social movements around the world.

关键词： cyberspace web-search engines spatial context geolocation web information landscape innovation diffusion

Vastly Synergistic Fe_(2)CuNiS_(4)-Nanoarchitectures Anchored 2D-Nano-Sandwich Derived from Flower-Like-CuFeS_(2)/N-Graphene and Cube-Like-NiFeS_(2)/N-CNTs for Water Oxidation and Nitrophenol Reduction

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Energy & Environmental Materials 2024年第6期7卷 274-289页

作者： Gopiraman Mayakrishnan Ramkumar Vanaraj Junpeng Xiong Muhammad Farooq Azeem Ullah Keqin Zhang Seong Cheol kim ick Soo kim Nano Fusion Technology Research Group Division of Molecules and PolymersInstitute for Fiber Engineering(IFES)Interdisciplinary Cluster for Cutting Edge Research(ICCER)Shinshu UniversityTokida 3-15-1UedaNagano 386-8567Japan School of Chemical Engineering Yeungnam UniversityGyeongsan 38541Korea Graduate School of Medicine Scienceand TechnologyShinshu UniversityTokida 3-15-1UedaNagano 386-8567Japan National Engineering Laboratory for Modern Silk College of Textile and Clothing EngineeringSoochow UniversitySuzhou 215123China

Surface area,pore properties,synergistic behavior,homogenous dispersion,and interactions between carbon matrix and metal-nanostructures are the key factors for achieving the better performance of carbon-metal based(electro)***,the traditional hydro-or solvothermal preparation of(electro)catalysts,particularly,bi-or tri-metallic nanostructures anchored graphene(G)or carbon nanotubes(CNTs),often pose to poor metal–support interaction,low synergism,and patchy *** first,bimetallic flower-like-CuFeS_(2)/NG and cube-like-NiFeS_(2)/NCNTs nanocomposites were prepared by solvothermal *** resultant bimetallic nanocomposites were employed to derive the 2D-nano-sandwiched Fe_(2)CuNiS_(4)/NGCNTs-SW(electro)catalyst by a very simple and green urea-mediated“mix-heat”*** desired physicochemical properties of Fe_(2)CuNiS_(4)/NGCNTs-SW such as multiple active sites,strong metal-support interaction,homogenous dispersion and enhanced surface area were confirmed by various microscopic and spectroscopic *** the best of our knowledge,this is the first urea-mediated“mix-heat”method for preparing 2D-nano-sandwiched carbon-metal-based(electro)*** Fe_(2)CuNiS_(4)/NGCNTs-SW was found to be highly effective for alkaline-mediated oxygen evolution reaction at low onset potential of 284.24 mV,and the stable current density of 10 mA cm^(−2) in 1.0 m KOH for 10 ***,the Fe_(2)CuNiS_(4)/NGCNTs-SW demonstrated excellent catalytic activity in the reduction of 4-nitrophenol with good kapp value of 87.71×10^(−2)s^(-1)and excellent reusability over five ***,the developed urea-mediated“mix-heat”method is highly efficient for the preparation of metal-nanoarchitectures anchored 2D-nano-sandwiched(electro)catalysts with high synergism,uniform dispersion and excellent metal-support interaction.

关键词： (electro)catalyst metal-sulfide nanoarchitectures mix-heat N-graphene/NCNTs synergistic effect urea

Mixed-dimensional stacked nanocomposite structures for a specific wavelength-selectable ambipolar photoresponse

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Nano Research 2024年第6期17卷 5549-5558页

作者： Young Jae Park Jaeho Shim Joo Song Lee Kyu Seung Lee Ji-Yeon kim Kang Bok Ko Sang-Youp Yim Seongjun kim Hoon-Kyu Shin Donghee Park Yong Ju Yun Dong ick Son Institute of Advanced Composite Materials Korea Institute of Science and TechnologyJeollabuk-do 55324Republic of Korea National Institute for Nanomaterials Technology Pohang University of Science and TechnologyGyeongsangbuk-do 37673Republic of Korea Department of Semiconductor Science and Technology Semiconductor Physics Research CenterJeonbuk National UniversityJeonju 54896Republic of Korea Advanced Photonics Research Institute Gwangju Institute of Science and TechnologyGwangju 61005Republic of Korea Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and TechnologySeoul 02792Republic of Korea Graduate School of Energy and Environment(KU-KIST Green School) Korea UniversitySeoul 02841Republic of Korea KIST School Department of Nanomaterials and Nano ScienceUniversity of Science and Technology(UST)Daejeon 34113Republic of Korea

Mixed-dimensional composite structures using zero-dimensional(0D)quantum dots(QDs)and two-dimensional(2D)transition metal dichalcogenides(TMDs)materials are expected to attract great interest in optoelectronics due to the potential to generate new optical ***,we report on the unique optical characteristics of a devices with mixed dimensional vertically stacked structures based on tungsten diselenide(WSe_(2))/CdSeS QDs monolayer/molybdenum disulfide(MoS_(2))(2D/0D/2D).Specifically,it exhibits an ambipolar photoresponse characteristic,with a negative photoresponse observed in the 400-600 nm wavelength range and a positive photoresponse appeared at 700 nm *** resulted in the high negative responsivity of up to 52.22 mA·W^(−1)under 400 nm,which is 163 times higher than that of the photodetector without CdSeS *** also demonstrated the negative photoresponse,which could be due to increased carrier collision probability and non-radiative *** modeling and simulation reveal that Auger recombination among the types of non-radiative recombination is the main cause of negative photocurrent ***,we discovered ambipolar photoresponse near a specific wavelength corresponding to the energy of quantum *** study revealed interesting phenomenon in the mixed low-dimensional stacked structure and paved the way to exploit it for the development of innovative photodetection materials as well as for optoelectronic applications.

关键词： mixed-dimension quantum dot heterostructure photodetector ambipolar photoresponse

Refined Functional Equations Stemming from Cubic,Quadratic and Additive Mappings

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Acta Mathematica Sinica,English Series 2009年第10期25卷 1595-1608页

作者： ick-Soon CHANG Eunyoung SON Hark-Mahn kim Department of Mathematics Mokwon University Department of Mathematics Chungnam National University

Let n ≥ 2 be an integer. In this paper, we investigate the generalized Hyers-Ulam stability problem for the following functional equation f（n-1∑j=1 xj＋2xn）＋f（n-1∑j=1 xj-2xn）＋8 n-1∑j=1f（xj）=2f（n-1∑j=1 xj... 详细信息

关键词： generalized Hyers-Ulam stability functional equations cubic mappings quadratic mappings difference operator

Solid-state phase transformations toward a metal-organic framework of 7-connected Zn_(4)0 secondary building units

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Nano Research 2021年第2期14卷 411-416页

作者： Jaehui kim Junsu Ha Jae Hwa Lee hoi Ri Moon Department of Chemistry Ulsan National Institute of Science and Technology(UNIST) Ulsan 44919Republic of Korea

In the development of metal-organic frameworks(MOFs),secondary building units(SBUs)have been utilized as molecular modules for the construction of nanoporous materials with robust *** solvothermal synthetic conditions,dynamic changes in the metal coordination environments and ligand coordination modes of SBUs determine the resultant product ***,MOF phases with new topologies can also be achieved by post-synthetic treatment of as-synthesized MOFs via the introduction of acidic or basic moieties that cause the simultaneous cleavage/reformation of coordination bonds in the solid *** this sense,we studied the solid-state transformation of two ndc-based Zn-MOFs(ndc=1,4-naphthalene dicarboxylate)with different SBUs but the same pcu topology to another MOF with sev *** of the chosen MOFs with pcu nets is[Zn_(2)(ndc)_(2)(bpy)]_(n)(bpy=4,4,-bipyridine),(6C_(bpy)-MOF)consisting of a 6-connected pillared-paddlewheel SBU,and the other is IRMOF-7 composed of 6-connected Zn40(C 00)6 SBUs and *** post-structural modification,these pcu MOFs were converted into the same MOF with sev topology constructed from the uncommon 7-connected Zri_(4)O(COO)_(7)SBU(7C-MOF).The appropriate post-synthetic conditions for the transformation of each SBUs were systematically *** addition,the effect of the pillar molecules in the pillared-paddlewheel MOFs on the topology conversion was studied in terms of the linker basicity,which determines the inertness during the solid-state phase *** post-synthetic modification approach is expected to expand the available methods for designing and synthesizing MOFs with controlled topologies.

关键词： metal-organic framework secondary building units solid-state transform ation linker basicity ligand addition reaction

The role of extracellular vesicles in animal reproduction and diseases

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Journal of Animal Science and Biotechnology 2022年第6期13卷 1634-1656页

作者： Sangiliyandi Gurunathan Min-Hee Kang Hyuk Song Nam Hyung kim Jin-hoi kim Department of Stem Cell and Regenerative Biotechnology Konkuk UniversitySeoul 05029Korea Guangdong Provincial Key Laboratory of Large Animal models for Biomedicine Wuyi UniversityJiangmen 529020China

Extracellular vesicles(EVs)are nanosized membrane-enclosed compartments that serve as messengers in cell-to-cell communication,both in normal physiology and in pathological *** can transfer functional proteins and genetic information to alter the phenotype and function of recipient cells,which undergo different changes that positively affect their structural and functional *** fluids are enriched with several subpopulations of EVs,including exosomes,microvesicles(MVs),and apoptotic bodies carrying several cargoes,such as lipids,proteins,and nucleic *** associated with the reproductive system are actively involved in the regulation of different physiological events,including gamete maturation,fertilization,and embryo and fetal *** can influence follicle development,oocyte maturation,embryo production,and endometrial-conceptus *** loaded with cargoes are used to diagnose various diseases,including pregnancy disorders;however,these are dependent on the type of cell of origin and pathological ***-derived microRNAs(miRNAs)and proteins in the placenta regulate inflammatory responses and trophoblast invasion through intercellular delivery in the placental *** review presents evidence regarding the types of extracellular vesicles,and general aspects of isolation,purification,and characterization of EVs,particularly from various types of ***,we discuss EVs as mediators and messengers in reproductive biology,the effects of EVs on placentation and pregnancy disorders,the role of EVs in animal reproduction,in the male reproductive system,and mother and embryo *** addition,we emphasize the role of microRNAs in embryo implantation and the role of EVs in reproductive and therapeutic ***,we discuss the future perspectives of EVs in reproductive biology.

关键词： Embryos Extracellular vesicles Implantation MicroRNA Pregnancy disorders

Metastatic liver cancer: A rare case

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World Journal of Gastroenterology 2005年第27期11卷 4281-4284页

作者： Bong-Wan kim Hee-Jung Wang In-Ho Jeong Sang-ick Ahn Myoung-Wook kim Department of Surgery

Hemangioperioltoma is a rare tumor especially when it rises in the peritoneal cavity. We present a case of a 60-year-old woman with an isolated recurrent hemangiopericytoma of the liver. The patient presented with a palpable right upper quadrant abdominal mass, which occurred 7 years after undergoing resection of a malignant hemangiopericytoma arising from the greater omentum. She had not followed up 6 mo after surgery. Various imaging studies showed a single large, well-capsulated liver tumor with central necrosis, accompanied by hypervascularity typical of a vascular tumor. Preoperative laboratory HBsAg and anti-HCV workup were both negative. Under the impression of recurrent malignant hemangiopericytoma, right trisegmentectomy was performed to completely resect the tumor. Pathological examination confirmed the diagnosis of recurrent hemangiopericytoma. Even though the incidence of the hemangiopericytoma is relatively low, malignant hemangiopericytoma has a tendency to recur frequently after a long-term disease-free interval. Also, the recurrent hemangiopericytoma is not easily detected early during follow-up until it becomes symptomatic because there are no specific tumor markers, and because of the diversity with regard to site of recurrence. The authors suggest that Positron Emission Tomogram （PET） may be a useful tool for the detection of recurrent hemangioperioltoma. We describe herein some characteristics and behaviors of malignant hemangiopericytoma, particularly after surgical resection.

关键词： Hemangiopericytoma Greater omentum Hepatic metastasis Follow-up Positron emission tomography

Influence of Tropical Cyclone Landfalls on Spatiotemporal Variations in Typhoon Season Rainfall over South China

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Advances in Atmospheric Sciences 2010年第2期27卷 443-454页

作者： Min-Hee LEE Chang-hoi HO Joo-Hong kim Computational Science and Technology Seoul National University School of Earth and Environmental Sciences Seoul National University Met Office Hadley Centre

This study examined the impact of tropical cyclone (TC) landfalls on the spatiotemporal variations in the rainfall over South China for the period 1957–2005. The target region was selected to show the noteworthy contribution of TC landfalls to the total rainfall during the typhoon season (July–October). Two prevailing spatial variations in the rainfall were obtained from an EOF analysis. The first EOF mode displays singlesign variability over South China with an explained variance of 23.4%. The associated time series of this mode fluctuates on a decadal timescale and was found to be correlated with TC genesis in the South China Sea. The second EOF mode shows a seesaw pattern between Hainan Island/Guangdong Province and the remaining regions with an explained variance of 11.4%. This seesaw pattern results from an anti-correlation in seasonal TC landfalls between the two regions, which was found in previous studies. This is related to the strengthening (weakening) of the upper tropospheric jets and the corresponding development of a massive anticyclonic (cyclonic) circulation over East Asia. The EOF analysis was also conducted using just the data for rainfall caused by landfalling TCs. This revealed that the first EOF mode using just the TC-induced rainfall is nearly identical to the second mode from the total rainfall. The obvious seesaw pattern of the first mode when employing just the TC-induced rainfall in the EOF analysis implies that this pattern has larger temporal variability than the single-signed pattern (i.e., the first EOF mode using the total rainfall) in terms of TC landfalls. This study suggests that TC landfalls over South China and the accompanying rainfall significantly modulate the spatial variation of the typhoon season rainfall there.

关键词： rainfall tropical cyclone South China typhoon season

Nitrogen-and Oxygen-Containing Porous Ultrafine Carbon Nanofiber:A Highly Flexible Electrode Material for Supercapacitor

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Journal of Materials Science & Technology 2017年第5期33卷 424-431页

作者： Kai Wei Kyu-Oh kim Kyung-Hun Song Chang-Yong Kang Jung soon Lee Mayakrishnan Gopiraman ick-Soo kim College of Textile and Clothing Engineering Soochow UniversitySuzhou215021China Nano Fusion Technology Research Group Division of Frontier FibersInstitute for Fiber Engineering(IFES)Interdisciplinary Cluster for Cutting Edge Research(ICCER)Shinshu UniversityTokida 3-15-1UedaNagano Prefecture386-8567Japan Department of Fiber System Engineering Dankook UniversityYoungin 448-701Republic of Korea Department of Clothing&Textiles PaiChai UniversityDaejeon 302-735Republic of Korea Department of Metallurgical Engineering Pukyong National UniversityBusan 608-739Republic of Korea Department of Clothing and Textiles Chungnam National UniversityDaejeon 305-764Republic of Korea

Herein, we report a simple and effective preparation of ultrafine CNFs （u-CNFs） with high surface area via electrospinning of two immiscible polymers [polyacrylonitrile （PAN） and poly（methyl methacry- late）（PMMA）] followed by calcination at high temperature in an inert atmosphere. Various electrospinning conditions were optimized in detail. Four different kinds of PAN/PMMA ratios （10/0, 7：3, 5：5 and 3：7） were chosen and found that the PAN/PMMA ratio of 3：7 （PAN/PMMA-3：7） is the optimum one. BET anal- ysis showed the specific surface area of the u-CNFs-3：7 was 46Z57 m2/g with an excellent pore volume （1.15 cms g-l） and an average pore size （9.48 nm）： it is about 25 times higher than the conventional CNFs （c-CNFs）. TEM and FE-SEM images confirmed the ultrafine structure of the CNFs with a thinner fiber di- ameter of-50 nm. The graphitic nature and atomic arrangement of the u-CNFs were investigated by Raman and XPS analyses. For the supercapacitor application, unlike the common electrode preparation methods, the u-CNFs-3：7 was used without any activation, chemical or mechanical modifications. The u-CNFs- 3：7 showed a better specific capacitance of 86 Fig in 1 mol/L 1-12S04 when compared to pure CNFs. The excellent physicochemical properties make the u-CNFs-3：7 an alternative choice to the existing CNFs for the supercapacitors.

关键词： Carbon fiber Porosity Electron microscopy Surface analysis Supercapacitor