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Ion shielding functional separator using halloysite containing a negative functional moiety for stability improvement of Li–S batteries

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Journal of Energy Chemistry 2021年第9期30卷 334-340页

作者： Yong Min Kwon jihoon kim Kuk Young Cho Sukeun Yoon Division of Advanced Materials Engineering&Institute for Rare Metals Kongju National UniversityChungnam 31080Republic of Korea Department of Materials Science and Chemical Engineering Hanyang UniversityGyeonggi 15588Republic of Korea

Lithium–sulfur batteries are one of the attractive next-generation energy storage systems owing to theienvironmental friendliness,low cost,and high specific energy ***,the low electrical conductivity of sulfur,shuttling of soluble intermediate polysulfides between electrodes,and low capacitretention have hampered their commercial *** address these issues,we use a halloysitemodulated(H-M)separator in a lithium–sulfur battery to mitigate the shuttling *** H-M separator acts as a mutual Coulombic repulsion in lithium-sulfur batteries,thereby selectively permitting Lions and efficiently suppressing the transfer of undesired lithium polysulfides to the Li anode sideMoreover,the use of halloysite switches the surface of the separator from hydrophobic to hydrophilicconsequently improving the electrolyte wettability and adhesion between the separator and cathodeWhen sulfur-multi-walled carbon nanotube(S-MWCNT)composites are used as cathode active materialsa lithium–sulfur battery with an H-M separator exhibits first discharge and charge capacities of 1587 an1527 m Ah g-1,***,there is a consistent capacity retention up to 100 cyclesAccordingly,our approach demonstrates an economical and easily accessible strategy for commercialization of lithium–sulfur batteries.

关键词： Li–S batteries Halloysite Ion shielding Negative functional moiety Lithium polysulfides

Growth of BaTiO_3-Ag hybrid composite films at room temperature by aerosol deposition

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中国有色金属学会会刊：英文版 2012年第S3期22卷 735-739页

作者： Young Joon YOON Sung Hwan CHO jihoon kim Hyo Tae kim Hong Koo BAIK Jong-Hee kim Nano-Convergence Intelligence Material Team Korea Institute of Ceramic Engineering and Technology Division of Advanced Materials Engineering Kongju National University Department of Materials Science and Engineering Yonsei University

Barium titanate (BaTiO3) and silver (Ag) composite film with high dielectric constant was grown at room temperature by an aerosol deposition *** dielectric constant increases by 0.5 times after adding Ag to the BaTiO3 matrix,compared with pure *** high dielectric constant can be attributed to the percolation effect of Ag inclusions in the BaTiO3 *** Ag was present in the form of discrete layer in the BaTiO3 *** dielectric properties of BaTiO3 Ag were discussed in detail taking into account the changes in microstructures.

关键词： composites percolation aerosol deposition BaTiO3 Ag

Transcriptional profiling of dental sensory and proprioceptive trigeminal neurons using single-cell RNA sequencing

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International Journal of Oral Science 2023年第3期15卷 513-526页

作者： Pa Reum Lee jihoon kim Heather Lynn Rossi Sena Chung Seung Yub Han Junhyong kim Seog Bae Oh Department of Neurobiology and Physiology School of Dentistry and Dental Research InstituteSeoul National UniversitySeoulRepublic of Korea Genomics and Computational Biology Graduate Group University of PennsylvaniaPhiladelphiaPAUSA Department of Pathobiology University of PennsylvaniaPhiladelphiaPAUSA Department of Biology University of PennsylvaniaPhiladelphiaPAUSA Brain Science Institute Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea

Dental primary afferent(DPA)neurons and proprioceptive mesencephalic trigeminal nucleus(MTN)neurons,located in the trigeminal ganglion and the brainstem,respectively,are essential for controlling masticatory *** extensive transcriptomic studies on various somatosensory neurons,there is still a lack of knowledge about the molecular identities of these populations due to technical challenges in their circuit-validated ***,we employed high-depth single-cell RNA sequencing(scRNA-seq)in combination with retrograde tracing in mice to identify intrinsic transcriptional features of DPA and MTN *** transcriptome analysis revealed five major types of DPA neurons with cell type-specific gene enrichment,some of which exhibit unique mechano-nociceptive properties capable of transmitting nociception in response to innocuous mechanical stimuli in the ***,we discovered cellular heterogeneity within MTN neurons that potentially contribute to their responsiveness to mechanical stretch in the masseter muscle ***,DPA and MTN neurons represented sensory compartments with distinct molecular profiles characterized by various ion channels,receptors,neuropeptides,and ***,our study provides new biological insights regarding the highly specialized mechanosensory functions of DPA and MTN neurons in pain and proprioception.

关键词： trigeminal specialized Together

Mimicking a Superhydrophobic Insect Wing by Argon and Oxygen Ion Beam Treatment on Polytetrafluoroethylene Film

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Journal of Bionic Engineering 2009年第4期6卷 365-370页

作者： Youngjong Lee Yonghoon Yoo jihoon kim Sriyulianti Widhiarini Baeho Park Hoon Cheol Park Kwang Joon Yoon Doyoung Byun Department of Aerospace Information Engineering Konkuk UniversitySeoul 143-701Republic of Korea Department of Physics Konkuk UniversitySeoul 143-701Republic of Korea Department of Advanced Technology Fusion Konkuk UniversitySeoul 143-701Republic of Korea

Biological tiny structures have been observed on many kinds of surfaces such as lotus leaves and insect wings,which enhance the hydrophobicity of the natural surfaces and play a role of *** presented the fabrication technology of a superhydrophobic surface using high energy ion *** insect wings that mimic the morphology and the superhydrophobocity of cicada's wings were successfully fabricated using argon and oxygen ion beam treatment on a polytetrafluoroethylene (PTFE)*** wing structures were supported by carbon/epoxy fibers as artificial flexible veins that were bonded through an autoclave *** morphology of the fabricated surface bears a strong resemblance to the wing surface of a cicada,with contact angles greater than 160°,which could be sustained for more than two months.

关键词： superhydrophobic insect wing mimicry of the wing ion beam treatment artificial flapper dynamic contact angle

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铝合金与高强钢摩擦塞铆焊接头连接性能

焊接学报 2021年第11期42卷 8-13,I0001页

作者： Lyu Shuqiang kim jihoon Cho Haeyong Department of Mechanical Engineering Chungbuk National UniversityChungbuk361-763Korea Sunil Dyfas Co. Ltd.Jincheon-GunChungbuk365-830Korea

为了解决铝合金与高强钢材料之间连接困难的问题,保证铝合金与高强钢之间的连接质量,采用摩擦塞铆焊工艺实现了6061-T6铝合金和DP1470高强钢的连接,并通过对接头宏观形貌和微观组织特征的观察、接头力学性能的测试以及接头失效形式的对... 详细信息

为了解决铝合金与高强钢材料之间连接困难的问题,保证铝合金与高强钢之间的连接质量,采用摩擦塞铆焊工艺实现了6061-T6铝合金和DP1470高强钢的连接,并通过对接头宏观形貌和微观组织特征的观察、接头力学性能的测试以及接头失效形式的对比,研究了摩擦塞铆焊所获接头连接性能的变化规律.结果表明,转速是影响焊接质量的重要因素.在焊接试验过程中,转速控制范围为5 000~8 000 r/min,接头的抗拉强度随转速的增加先升高后降低,当转速达到7 000 r/min时,接头所承受的剪切载荷最大,可以达到6.3 kN,此时得到的接头表面平整,无明显孔洞、裂纹等缺陷.铝合金板材在接头处发生断裂失效时,接头所能承受载荷相对较大,焊接质量较高.因此,铝合金和高强钢能够通过摩擦塞铆焊工艺实现高质量连接.

关键词：铝合金高强钢摩擦塞铆焊力学性能失效形式

Ceramic-metal package for high power LED lighting

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Frontiers of Optoelectronics 2012年第2期5卷 133-137页

作者： Yu Jin HEO Hyo Tae kim Sahn NAHM jihoon kim Young Joon YOON Jonghee kim Korea Institute of Ceramic Engineering and Technology Seoul 153-801 Korea Department of Materials Science and Engineering Korea University Seoul 136 701 Korea

High power light-emitting diodes （LEDs） lighting has drawn a great interest in the field of street light system in recent years. Key parameters for successful launching of LED street light in the commercial market are price and light efficiency, respectively, and they are greatly influenced by the materials and design factors used in high power LED package. This article presents a new design and materials processing technology to realize the solution of LED packaging with advantageous in price and performance. Cost effective materials and processing technology can be realized via thick film glass-ceramic insulating layer and silver conductor. Highly effective thermal design using direct heat dissipation to heat sink in LED package is demonstrated.

关键词： light-emitting diodes (LEDs) package high-power thick film heat dissipation thermal resistance

Soft wearable flexible bioelectronics integrated with an anklefoot exoskeleton for estimation of metabolic costs and physical effort

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npj Flexible Electronics 2023年第1期7卷 535-544页

作者： jihoon kim Prakyath Kantharaju Hoon Yi Michael Jacobson Hyungkeun Jeong Hojoong kim Jinwoo Lee Jared Matthews Nathan Zavanelli Hyeonseok kim Heejin Jeong Myunghee kim Woon-Hong Yeo IEN Center for Human-Centric Interfaces and Engineering and George W.Woodruff School of Mechanical Engineering Georgia Institute of TechnologyAtlantaGA 30332USA Department of Mechanical and Industrial Engineering the University of Illinois at ChicagoChicagoIL 60607USA Department of Mechanical Roboticsand Energy EngineeringDongguk UniversitySeoulRepublic of Korea Human Systems Engineering The Polytechnic SchoolIra A.Fulton Schools of EngineeringArizona State UniversityMesaAZ 85212USA Wallace H.Coulter Department of Biomedical Engineering Georgia Institute of Technology and Emory University School of MedicineAtlantaGA 30332USA Institute for Robotics and Intelligent Machines Parker H.Petit Institute for Bioengineering and BiosciencesInstitute for MaterialsNeural Engineering CenterGeorgia Institute of TechnologyAtlantaGA 30332USA

Activities and physical effort have been commonly estimated using a metabolic rate through indirect calorimetry to capture breath *** physical effort represents the work hardness used to optimize wearable robotic ***,personalization and rapid optimization of the effort are *** respirometry is the gold standard for estimating metabolic costs,this method requires a heavy,bulky,and rigid system,limiting the system’s field ***,this paper reports a soft,flexible bioelectronic system that integrates a wearable ankle-foot exoskeleton,used to estimate metabolic costs and physical effort,demonstrating the potential for real-time wearable robot adjustments based on *** from a set of activities,including walking,running,and squatting with the biopatch and exoskeleton,determines the relationship between metabolic costs and heart rate variability root mean square of successive differences(HRV-RMSSD)(R=−0.758).Collectively,the exoskeleton-integrated wearable system shows potential to develop a field-deployable exoskeleton platform that can measure wireless real-time physiological signals.

关键词： skeleton wear estimation

Structural Evolution of Polyacrylonitrile Fibers in Stabilization and Carbonization

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Advances in Chemical Engineering and Science 2012年第2期2卷 275-282页

作者： Sungho Lee jihoon kim Bon-Cheol Ku Junkyung kim Han-Ik Joh Institute of Advanced Composite Materials Korea Institute of Science and Technology Jeollabuk-do Korea (South) Korea Institute of Science and Technology Seoul Korea (South)

The effect of structural evolution polyacrylonitrile (PAN) on mechanical properties was investigated in stabilization and carbonization. PAN spun fibers were stabilized in a convection oven with a constant tension for various times at 250℃. Fourier Transform Infrared spectroscopy (FTIR) and gel fraction results suggested that intra and intermolecular stabilization reactions occurred simultaneously. X-ray diffractograms revealed a disruption of crystalline structure and an appearance of pre-graphitic structure of PAN fibers due to stabilization. These structural changes by stabilization resulted in the significant decrease of tensile properties of fibers. In Raman spectra with heat treated fibers from 400℃ up to 1200℃, the intensity ratio of the D to G bands (ID/IG) decreased as heat treatment temperature increased, indicating an increase of basal plane of graphitic layer of heat treated fibers. Tensile strength of heat treated fibers at 1200℃ was found to be as high as 2.2 GPa.

关键词： Polyacrylonitrile Stabilization Carbonization XRD Tensile Properties Carbon Fibers

录像、电影与后电影:论让-吕克·戈达尔的《电影史》

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世界电影 2024年第1期 39-51页

作者： [韩国]金智勋惠政(译) 韩国中央大学电影学系南京大学艺术学院

在我看来,录像似乎是电影的一个化身,但在毫无创造力、只为了传播而存在的广播电视中,录像已经变得与电影截然不同。但是录像会被信息技术或者某种混合技术所超越,这些技术虽然刚刚问世,却会愈发远离电影创作。我想说的是,录像和电影之... 详细信息

在我看来,录像似乎是电影的一个化身,但在毫无创造力、只为了传播而存在的广播电视中,录像已经变得与电影截然不同。但是录像会被信息技术或者某种混合技术所超越,这些技术虽然刚刚问世,却会愈发远离电影创作。我想说的是,录像和电影之间差别不大,在使用上亦然……

关键词：电影史广播电视信息技术电影创作录像戈达尔创造力