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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

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Thyrotoxicosis induced cardiogenic shock rescued by extracorporeal membrane oxygenation

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Journal of Geriatric Cardiology 2018年第2期15卷 203-204页

作者： Seunghwan kim Sang-Hoon Seol Yun-Seok kim Dong-Kie kim Ki-hun kim Doo-Il kim Department of Internal Medicine INJE University College of Medicine Haeundae Paik hospital Busan South Korea

Cardiomyopahty is one of complications of thyrotoxicosis. About 6% of thyrotoxic patients develop heart failure, but less than 1% of the patients progress dilated cardiomyopathy with systolic left ventricular dysthnct... 详细信息

关键词： Cardiogenic shock Extracorporeal membrane oxygenation Thyrotoxic cardiomyopathy

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Variability of the Dokdo Abyssal Current observed in the Ulleung Interplain Gap of the East/Japan Sea

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Acta Oceanologica Sinica 2013年第1期32卷 12-23页

作者： kim Yun-Bae CHANG Kyung-Il PARK Jae-hun PARK Jong Jin East Sea Research Institute Korea Institute of Ocean Science and Technology Research Institute of Oceanography School of Earth and Environmental Sciences Seoul National University Ocean Science Research Department Korea Institute of Ocean Science and Technology Department of Oceanography Kyungpook National University

Subinertial fluctuation of a strong northward deep current, which is referred to the Dokdo Abyssal Current （DAC） by Chang et al. （2009）, is investigated from current records for about 16.5 and 8.0 months in the Ulle- ung Interplain Gap of the East/lapan Sea. The current below 300 m is bottom-intensified and has nearly depth-independent flow. Near bottom, the spectral peaks of the current were found near 10, 20, and 60 d. The DAC variability near 10 d and 20 d is reasonably consistent with the linear theory of topographic Rossby waves （TRWs） in the following aspects：（1） The motion is columnar and bottom-intensified; （2） the theo- retical cutoff frequency is similar to the observation; （3） The observation-based angles of the wavenumber vector are in good agreement with the theoretical ones. The wavelengths of the TRWs with periods of near 10 d and 20 d near Dokdo are significantly shorter than those with similar timescales in the open oceans （100-250 km）. It is primarily due to the weak stratification below 300 m in the East Sea. The deep cur- rent fluctuations with periods of near 10 d and 20 d were accompanied by warm events in the upper layer resulting from eddying processes and/or meandering of the Tsushima Warm Current.

关键词： East/Iapan Sea Ulleung Interplain Gap Deep currents Topographic Ressby waves

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Improved VGG Model for Road Traffic Sign Recognition

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Computers, Materials & Continua 2018年第10期57卷 11-24页

作者： Shuren Zhou Wenlong Liang Junguo Li jeong-Uk kim hunan Provincial Key Laboratory of Intelligent Processing of Big Data on Transportation Changsha University of Science&TechnologyChangsha410114China School of Computer&Communication Engineering Changsha University of Science&TechnologyChangsha410114China Department of Energy Grid Sangmyung UniversitySeoul110743Korea

Road traffic sign recognition is an important task in intelligent transportation *** neural networks(CNNs)have achieved a breakthrough in computer vision tasks and made great success in traffic sign *** this paper,it presents a road traffic sign recognition algorithm based on a convolutional neural *** natural scenes,traffic signs are disturbed by factors such as illumination,occlusion,missing and deformation,and the accuracy of recognition decreases,this paper proposes a model called Improved VGG(IVGG)inspired by VGG *** IVGG model includes 9 layers,compared with the original VGG model,it is added max-pooling operation and dropout operation after multiple convolutional layers,to catch the main features and save the training *** paper proposes the method which adds dropout and Batch Normalization(BN)operations after each fully-connected layer,to further accelerate the model convergence,and then it can get better classification *** uses the German Traffic Sign Recognition Benchmark(GTSRB)dataset in the *** IVGG model enhances the recognition rate of traffic signs and robustness by using the data augmentation and transfer learning,and the spent time is also reduced greatly.

关键词： Intelligent transportation traffic sign deep learning GTSRB data augmentation

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Cloning of heat shock protein genes from the brown planthopper, Nilaparvata lugens, and the small brown planthopper, Laodelphax striatellus, and their expression in relation to thermal stress

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Insect Science 2008年第5期15卷 415-422页

作者： Dong hun kim Sang-Chul Lee Do-Yeon Kwak Kyeong-Yeoll Lee School of Applied Biosciences College of Agricultura and Life Sciences Kyungpook National University Daegu Yeongnam Agricultural Research Institute Milyang Republic of Korea

Three heat shock protein （HSP） genes （hsp70, hsc70, hsp90） were partially cloned from the brown planthopper Nilaparvata lugens and the small brown planthopper Laodelphax striatellus （Homoptera： Delphacidae）, which are serious pests of the rice plant. Sequence comparisons at the deduced amino acid level showed that the three HSPs of planthoppers were most homologous to corresponding HSPs of dipteran and lepidopteran species. Identities of both heat shock cognate 70 and HSP90 were higher than HSP70 in both species. Identity of the HSP70 between the two planthopper species was only 81%, a value much lower than seen among fly and moth groups. Effects of heat and cold shocks were demonstrated on expression of the three hsp genes in the two planthopper species. Heat shock （40 ℃） upregulated the hsp90 level but did not change the hsc70 level in either the nymph and adult stages of either species. On the other hand, the hsp70 level was only upregulated in L. striatellus. This heat shock response was prompt and lasted only for 1 h after treatment. In contrast, cold shock at 4℃ did not change the expression levels of any hsp in either species.

关键词： cold shock gene expression heat shock heat shock protein genes planthoppers thermal stress

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Development of a hybrid scaffold and a bioreactor for cartilage regeneration

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Chinese Science Bulletin 2009年第19期54卷 3608-3612页

作者： LEE Seung-Jae LEE In Hwan PARK jeong hun GWAK So-Jung RHIE Jong-Won CHO Dong-Woo KO Tae Jo kim Dong Sung BK21 Mechatronics Group at Chungnam National University School of Mechanical Engineering Chungbuk National University DDS Research Lab. CKD Research Institute CKD Pharmaceutical Corp. Department of Plastic Surgery College of Medicine The Catholic University of Korea Department of Mechanical Engineering Pohang University of Science and Technology School of Mechanical Engineering Yeungnam University School of Mechanical Engineering Chung-Ang University

We developed a hybrid scaffold and a bioreactor for cartilage regeneration. The hybrid scaffold was developed as combination of two components: a biodegradable framework and hydrogel-containing chondrocytes. We performed the MTT cell proliferation assay to compare the proliferation and viability of chondrocytes on three types of scaffolds: an alginate gel, the hybrid scaffold, and an alginate sponge. Cells were encapsulated in 2% agarose gel. The bioreactor consisted of a circulation system and a compression system. We performed dynamic cell culture on these agarose gels in the bioreactor for 3 days.

关键词： MTT 生物分解凝解胶研究

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Superinsulating BNNS/PVA Composite Aerogels with High Solar Reflectance for Energy-Efficient Buildings

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Nano-Micro Letters 2022年第3期14卷 292-307页

作者： Jie Yang Kit‑Ying Chan Harun Venkatesan Eunyoung kim Miracle Hope Adegun Jeng‑hun Lee Xi Shen Jang‐Kyo kim Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongPeople’s Republic of China Department of Aeronautical and Aviation Engineering The Hong Kong Polytechnic UniversityHung HomKowloonHong KongPeople’s Republic of China

With the mandate of worldwide carbon neutralization,pursuing comfortable living environment while consuming less energy is an enticing and unavoidable *** composite aerogels with super thermal insulation and high sunlight reflection are developed for energy-efficient buildings.A solvent-assisted freeze-casting strategy is used to produce boron nitride nanosheet/polyvinyl alcohol(BNNS/PVA)composite aerogels with a tailored alignment channel *** effects of acetone and BNNS fillers on microstructures and multifunctional properties of aerogels are *** acetone in the PVA suspension enlarges the cell walls to suppress the shrinkage,giving rise to a lower density and a higher porosity,accompanied with much diminished heat conduction throughout the whole *** addition of BNNS fillers creates whiskers in place of disconnected transverse ligaments between adjacent cell walls,further ameliorating the thermal insulation transverse to the cell wall *** resultant BNNS/PVA aerogel delivers an ultralow thermal conductivity of 23.5 mW m^(−1) K^(−1) in the transverse *** superinsulating aerogel presents both an infrared stealthy capability and a high solar reflectance of 93.8%over the whole sunlight wave-length,far outperforming commercial expanded polystyrene foams with reflective *** anisotropic BNNS/PVA composite aerogel presents great potential for application in energy-saving buildings.

关键词： Boron nitride nanosheets Solvent-assisted freeze-casting Thermally insulating aerogel Solar reflectance Energy-saving buildings

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Structural Resistance of SRC Column-Steel Beam Joint Developed for Innovative Construction of Buildings

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Journal of Iron and Steel Research International 2011年第S1期18卷 924-928页

作者： Seo Soo-yeon Yun Hyun-Do kim Seung-hun Dept.of Architectural Engineering Chungju National UniversityChungjuKorea Dept.of Architectural Engineering Chungnam National UniversityDaejeonKorea Dept.of Architectural Engineering Hanbat National UniversityDaejeonKorea

This paper presents an experimental study investigating factors influencing the effective width of steel reinforced concrete (SRC) column-steel beam joints of building in order to calculate its resisting *** 1/2 scaled interior SRC column-steel beam joint specimens were made with considering parameters such as beam flange width,beam depth and SRC column *** directional increasing moment was applied to the joint by acting forces to each ends of beam and the structural behavior of joint was *** previous design method suggested by Deierlein was reviewed and a modified equation was proposed from the analysis of test *** result indicated that the equation to calculate the effective width in Deierlein’s design method didn’t consider effectively the influence caused by the variation of beam depth so that a modified equation was suggested and the validation of it was confirmed in this paper.

关键词： SRC column-steel beam joint effective width flange width beam depth

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Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and a high risk of perforation

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World Journal of Pediatrics 2018年第2期14卷 184-190页

作者： Hee Mang Yoon Jung Heon kim Jong Seung Lee jeong-Min Ryu Dae Yeon kim jeong-Yong Lee Department of Radiology and Research Institute of Radiology Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Emergency Medicine Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatric Surgery Asan Medical CenterUniversity of Ulsan College of MedicineSeoul 05505South Korea Department of Pediatrics Asan Medical CenterUniversity of Ulsan College of Medicine88Olympic-ro 43-gilSongpa-guSeoul 05505South Korea

Background Appendicolith can cause appendiceal obstruction and acute *** high prevalence may be related to the high perforation rate in pediatric *** study assessed the characteristics of appendicolith and its clinical significance in pediatric *** A retrospective study was performed among children and adolescents younger than 17 years who were preopera-tively diagnosed with appendicitis in the pediatric emergency department(ED).A total of 269 patients with a mean age of 9.98±3.37 years were *** features and contrast-enhanced computed tomography findings were *** Among the 269 patients,147(54.6%)had appendicoliths,with a mean maximal diameter of 5.21±2.34 ***-pared to the no appendicolith group,the appendicolith group demonstrated more prolonged abdominal pain(≥48 hours)before the ED visit(23.1%vs.11.5%;P=0.013),clinical features of severe appendicitis(presence of fever,vomiting,posi-tive urine ketone,and increased C-reactive protein),and higher rate of perforation(43.5%vs.9.8%;P<0.001).Multivariate risk factor analysis for perforated appendicitis in the appendicolith group revealed that maximal diameter of 5 mm or more in the appendicolith(adjusted odds ratio[aOR]2.919;95%CI 1.325-6.428,P=0.008)and proximal collapse adjacent to the appendicolith(aOR 2.943;95%CI 1.344-6.443,P=0.007)were *** Pediatric appendicitis with appendicolith often presents with prolonged abdominal pain and severe clinical conditions with a high risk of perforation.

关键词： Appendicitis Appendicolith Computed tomography Pediatrics Risk factors

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Anisotropic,Wrinkled,and Crack-Bridging Structure for Ultrasensitive,Highly Selective Multidirectional Strain Sensors

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Nano-Micro Letters 2021年第8期13卷 121-135页

作者： Heng Zhang Dan Liu Jeng-hun Lee Haomin Chen Eunyoung kim Xi Shen Qingbin Zheng Jinglei Yang Jang-Kyo kim Department of Mechanical and Aerospace Engineering The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongPeople’s Republic of China School of Science and Engineering The Chinese University of Hong KongShenzhen 518172GuangdongPeople’s Republic of China

Flexible multidirectional strain sensors are crucial to accurately determining the complex strain states involved in emerging sensing *** considerable efforts have been made to construct anisotropic structures for improved selective sensing capabilities,existing anisotropic sensors suffer from a trade-off between high sensitivity and high stretchability with acceptable ***,an ultrasensitive,highly selective multidirectional sensor is developed by rational design of functionally different anisotropic *** bilayer sensor consists of an aligned carbon nanotube(CNT)array assembled on top of a periodically wrinkled and cracked CNT-graphene oxide *** transversely aligned CNT layer bridge the underlying longitudinal microcracks to effectively discourage their propagation even when highly stretched,leading to superior sensitivity with a gauge factor of 287.6 across a broad linear working range of up to 100%*** wrinkles generated through a pre-straining/releasing routine in the direction transverse to CNT alignment is responsible for exceptional selectivity of 6.3,to the benefit of accurate detection of loading directions by the multidirectional *** work proposes a unique approach to leveraging the inherent merits of two cross-influential anisotropic structures to resolve the trade-off among sensitivity,selectivity,and stretchability,demonstrating promising applications in full-range,multi-axis human motion detection for wearable electronics and smart robotics.

关键词： Anisotropic strain sensor Wrinkle Aligned carbon nanotube Stretchability Complex motion detection

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