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Rapid Establishment of Tracheal Stenosis in Pigs Using Endotracheal Tube Cuff Overpressure and Electrocautery

Current Medical Science 2021年第2期41卷 329-335页

作者： Jin Hyoung Kim Jong Joon Ahn Yangin Jegal Soohyun Bae Soon Eun Park Moon Sik Jung Ju Ik Park Hee Jeong Cha Yongjik lee taehoon lee Division of Respiratory and Critical Care Medicine Department of Intemnal MedicineUlsan University HospitalUniversity of Ulsan College of MedicineUlsan 44033Korea Department of Anesthesiology and Pain Medicine UIsan University HospitalUniversity of Ulsan College of MedicineUlsan 44033Korea Department of Pathology Ulsan University HospitalUniversity of Ulsan College of MedicineUlsan 44033Korea Department of Thoracic and Cardiovascular Surgery Ulsan University HospitalUniversity of Ulsan College of MedicineUlsan 44033Korea

To apply a new airway treatment to humans, preclinical studies in an appropriate animalmodel is needed. Canine, porcine and leporine tracheas have been employed as animal airwaystenosis models using various methods such as chemical caustic agents, laser, and ***, existing models take a long time to develop (3- 8 weeks) and the mechanism of stenosisis different from that in humans. The aim of the present study was to establish a new and fasttracheal stenosis model in pigs using a combination of cuff overpressure intubation (COI) andelectrocautery. Fourteen pigs were divided into three groups: tracheal cautery (TC) group (n=3),COI group (n=3), and COI-TC combination group (n=8). Cuff overpressure (200/400/500 mmHg)was applied using a 9-mm endotracheal tube. Tracheal cautery (40/60 watts) was performed usinga rigid bronchoscopic electrocoagulator. After intervention, the pigs were observed for 3 weeks andbronchoscopy was performed every 7 days. When the cross-sectional area decreased by > 50%, itwas confirmed that tracheal stenosis was established. The time for tracheal stenosis was 14 days inthe TC group and 7 days in the COI-TC combination group. In the COI group, no stenosis *** the COI-TC group, electrocautery (40 watts) immediately after intubation for>1 h with a cufpressure of 200 mmHg or more resulted in suficient tracheal stenosis within 7 days. Moreover, thedegree of tracheal stenosis increased in proportion to the cuff pressure and tracheal intubation *** combined use of cuf overpressure and electrocautery helped to establish tracheal stenosis inpigs rapidly.

关键词： pig tracheal stenosis model cuff overpressure electrocautery

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Humidity-induced synaptic plasticity of ZnO artificial synapses using peptide insulator for neuromorphic computing

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Journal of Materials Science & Technology 2022年第24期119卷 150-155页

作者： Min-Kyu Song Hojung lee Jeong Hyun Yoon Young-Woong Song Seok Daniel Namgung taehoon Sung Yoon-Sik lee Jong-Seok lee Ki Tae Nam Jang-Yeon Kwon School of Integrated Technology Yonsei UniversityIncheon 21983South Korea Department of Materials Science and Engineering Seoul National UniversitySeoul 08826South Korea Soft Foundry Seoul National UniversitySeoul 08826South Korea School of Chemical and Biological Engineering Seoul National UniversitySeoul 08826South Korea

Neuromorphic devices inspired by the human brain have attracted significant attention because of their excellent ability for cognitive and parallel *** study presents ZnO-based artificial synapses with peptide insulators for the electrical emulation of biological *** demonstrated the dynamic responses of the device under various environmental *** proton-conducting property of the tyrosine-rich peptide enables time-dependent responses under ambient conditions such that various aspects of synaptic behaviors are emulated by the *** transition from short-term memory to longterm memory is achieved via electrochemical doping of ZnO by ***,we demonstrate an image classification simulation using a multi-layer perceptron model to evaluate the potential of the device for use in neuromorphic *** neural network based on our device achieved a recognition accuracy of 87.47% for the MNIST handwritten digit *** work proposes a novel device platform inspired by biosystems for brain-mimetic hardware systems.

关键词： Artificial synapse Neuromorphic computing Oxide semiconductor Proton conductor Artificial neural network

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Development of RuS_(2) for near-infrared photodetector by atomic layer deposition and post-sulfurization

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Rare Metals 2022年第9期41卷 3086-3099页

作者： Tatsuya Nakazawa Donghyun Kim Jaehyeok Kim Yohei Kotsugi taehoon Cheon Seung-Min Chung Soo-Hyun Kim Hyungjun Kim School of Electrical and Electronic Engineering Yonsei UniversitySeoul03722Korea Isehara Technical Center Metallic Materials Development DepartmentTANAKA Kikinzoku Kogyo K.KIseharaKanagawa259-1146Japan Institute of Materials Technology Yeungnam UniversityGyeongsan-si38541GyeongbukKorea Chemical Materials Development Department TANAKA Kikinzoku Kogyo K.KTsukuba Technical CenterIbaraki300-4247Japan School of Materials Science and Engineering Yeungnam UniversityGyeongsan-si38541GyeongbukKorea Center for Core Research Facilities Daegu Gyeongbuk Institute of Science&TechnologyDaegu711-873Korea

The chalcogenides of platinum-group metals(PGMs)have been known to be present in minerals and the intermediate products of *** recent years,their applications in various fields,including catalysis,have been *** that certain PGM chalcogenides behave as compound semiconductors,they can be used as materials for *** this study,RuS_(2),featuring a bandgap suitable for near-infrared photodetectors,was prepared by forming Ru on a SiO_(2)/Si substrate via the atomic layer deposition method using[Ru(TMM)(CO)_(3)]as the *** was conducted at 800℃ for 1 h under H_(2)S ***-resolution transmission electron microscopy(HRTEM)and X-ray diffraction(XRD)analysis clearly confirmed that the as-deposited hexagonal close-packed(hcp)Ru transformed to cubic RuS_(2) after *** surface morphologies,chemical states,and electrical and optical properties of RuS_(2) were *** influence of the metallic Ru surface morphology prior to sulfurization on the reaction between Ru and H_(2)S was also *** evaluate the potential of using RuS_(2) as a photodetector,a photodetector was fabricated by forming electrodes on RuS_(2) to measure its photocurrent under near-infrared ***,RuS_(2) was proven to exhibit a short response time(59μs)and generate a photocurrent of 84 nA under near-infrared light at 940 nm.

关键词： RuS_(2) Sulfurization Atomic layer deposition Photodetector

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COMPUTATION OF NONEQUILIBRIUM HYPERSONIC FLOW OVER CONCAVE CORNERS

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Journal of Computational Mathematics 2001年第6期19卷 617-628页

作者： taehoon Park You-lan Zhu Kookmin University 韩国 136-702 The University of North Carolina 美国

Discusses a technique for the computation of hypersonic flow of air with chemical reactions over concave corners. Details of smooth transformation of domain; Use of finite difference method; Numerical results.

关键词： Shock fitting Smooth transformation of domain Finite difference method Implicit method.

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Recent advances in hydrogen storage technologies based on nanoporous carbon materials

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Progress in Natural Science:Materials International 2012年第6期22卷 631-638页

作者： Seung Jae Yang Haesol Jung taehoon Kim Chong Rae Park Carbon Nanomaterials Design Laboratory Global Research LaboratoryResearch Institute of Advanced Materialsand Department of Materials Science and EngineeringSeoul National UniversitySeoul 151-744Republic of Korea

Hydrogen is a promising energy carrier that can potentially facilitate a transition from fossil fuels to sustainable energy sources without producing harmful *** to realizing a hydrogen economy,however,viable hydrogen storage materials must be *** adsorption in porous solids provides an opportunity for hydrogen storage under low-stringency *** adsorbed hydrogen molecules are weakly bound to a surface and,hence,are easily *** the various surface candidates,porous carbons appear to provide efficient hydrogen storage,with the advantages that porous carbon is relatively low-cost to produce and is easily *** this review,we summarize the preparation methods,pore characteristics,and hydrogen storage capacities of representative nanoporous carbons,including activated carbons, zeolite-templated carbon,and carbide-derived *** focus particularly on a series of nanoporous carbons developed recently:metal-organic framework-derived carbons,which exhibit promising properties for use in hydrogen storage applications.

关键词： Hydrogen storage MOF-derived carbon Nanoporous carbons Structure-property relationship

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Electrostabilized homogeneous dispersion of boron nitride nanotubes in wide-range of solvents achieved by surface polarity modulation through pyridine attachment

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Nano Research 2020年第2期13卷 344-352页

作者： Mi Se Chang Min-Sun Jang Sangsun Yang Jihun Yu taehoon Kim Sedong Kim Hyomin Jeong Chong Rae Park Jae Won Jeong Powder/Ceramic Research Division Korea Institute of Materials Science797 Changwondae-roSeongsan.guChangwon 51508Republic of Korea Research Institute of Advanced Materials and Department of Materials Science and Engineering Seoul National University Seoul 08826Republic of Korea Composites Research Division Korea Institute of Materials Science797 Changwondae-roSeongsan-guChangwon 51508Republic of Korea Dept.of Energy and Mech.Eng Gyeongsang National UniversityCheondaegukchi-Gil 38Tongyeong 53064Republic of Korea

Boron nitride nanotubes(BNNTs)show exceptional physical properties including high mechanical strength and thermal conductivity;however,their applications have been restricted due to limited dispersibility in processing ***,a novel BNNT dispersion method with exceptional dispersibility in a wide range of solvents has been demonstrated by surtace polarity modulation through short-molecule pyridine *** atoms in pyridine are selectively bonded to electron-deficient boron atoms of the BNNT surface through Lewis acid-base reaction,which changes the surface polarity of BNNTs from neutral to ***-dispersing pyridine-attached BNNTs(Py-BNNTs)create a thick and stable electronic double layer(EDL),resulting in uniform dispersion of BNNTs in solvents with an exceptional solubility parameter range of 18.5-48 MPa^1/*** uniform dispersion of BNNTs is maintained even after the mixing with diverse ***,composites incorporating uniformly-distributed BNNTs have been realized,and extraordinary property enhancements have been *** thermal conductivity of 20 wt.%Py-BNNT/epoxy composite has been significantly improved by 69.6%and the tensile strength of 2 wt.%Py-BNNT/PVA has been dramatically improved by 75.3%.Our work demonstrates a simple and facile route to dispersing BNNTs in diverse solvents,consequently leading to selective utlization of BNNT dispersed solvents in various application fields.

关键词： boron nitride nanotube one-dimensional nanomaterials surface polarity modulation electrostabilization boron nitride nanotube composite

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Chemoresistive materials for electronic nose:Progress,perspectives,and challenges

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InfoMat 2019年第3期1卷 289-316页

作者： Seo Yun Park Yeonhoo Kim taehoon Kim Tae Hoon Eom Soo Young Kim Ho Won Jang Department of Materials Science and Engineering Research Institute of Advanced MaterialsSeoul National UniversitySeoulRepublic of Korea Center for Integrated Nanotechnologies Los Alamos National LaboratoryLos AlamosNew Mexico School of Chemical Engineering and Materials Science Chung-Ang UniversitySeoulRepublic of Korea

An electronic nose(e-nose)is a device that can detect and recognize odors and flavors using a sensor *** has received considerable interest in the past decade because it is required in several areas such as health care,environmental monitoring,industrial applications,automobile,food storage,and ***,there are still obstacles in developing a portable e-nose that can be used for a wide variety of *** practical applications of an e-nose,it is necessary to collect a massive amount of data from various sensing materials that can transduce interactions with molecules reliably and analyze them via pattern *** addition,the possibility of miniaturizing the e-nose and operating it with low power consumption should be ***,it should work efficiently over a long period of *** satisfy these requirements,several different chemoresistive material platforms including metal oxides,organics such as polymers and carbonbased materials,and two-dimensional materials were investigated as sensor elements for an *** an individual material has limited selectivity,there is a continuing effort to improve the selectivity and gas sensing properties through surface decoration and compositional and structural *** produce a reliable e-nose,which can be used for practical applications,researches in various fields have to be *** paper reviews the progress of research on e-noses based on a chemoresistive gas sensor array and discusses the inherent challenges and potential solutions.

关键词： chemoresistive materials electronic nose metal oxides polymers two-dimensional materials

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Switchable Nanoporous Sheets by Aqueous Self-Assembly of Aromatic Macrobicycles

Switchable Nanoporous Sheets by Aqueous Self-Assembly of Aro...

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中国化学会第十四届胶体与界面化学会议

作者： Yongju Kim Suyong Shin taehoon Kim Dongseon lee Chaok Seok Myongsoo lee State Key Laboratory of Supramolecular Structure and Materials College of ChemistryJilin University

＜正＞A rationally-designed macrobicychc amphiphile consisting of a hydrophilic dendron at Che center of the aromatic plane self-assembles into a porous 2D structure with nano-sized lateral pores through the lateral a...

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A Simple Solution of the WSix Peeling Issue at MDDR Technology

A Simple Solution of the WSix Peeling Issue at MDDR Technolo...

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2008 9th International Conference on Solid-State and Integrated-Circuit Technology

作者： HanYong Chae Sung Young lee taehoon Park HyunSung lee KwangHee lee Ju Won Seo Kyue Sang Choi School of Semiconductor Engineering SamSung Institute of Technology(SSIT)Gyeonggi-DoKOREA FAB3 Team Memory Division Semiconductor Business Samsung Electronics Co.San 16 Banwol-DongHwasung-CityGyeonggi-DoKOREA445-701 Product Quality Assurance Team Memory Division Semiconductor Business Samsung Electronics Co.San 16 Banwol-DongHwasung-CityGyeonggi-DoKOREA445-701

In this paper,the advanced process has been presented to remove the WSi peeling which was brought in sub- l00nm DRAM SRCAT (Sphere-shaped-Recess-Channel-Array Transistor).The source of WSi peeling was proved to be the groove of gate poly *** have completely solved the problems to adopt the gate-poly CMP(Chemical Mechanical Polishing) process.

关键词： SRCAT(Sphere-shaped-Recess-Channel-Array Transistor) WSix Peeling,Groove Gate Poly CMP(Chemical Mechanical Polishing).

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SHOCK INTERACTIONS IN NONEQUILIBIUM HYPERSONIC FLOW

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Journal of Computational Mathematics 1997年第4期15卷 345-364页

作者： taehoon Park(Department of Mathematics, The University of North Carolina at Chapel Hill, USA)You-lan Zhu (Department of Mathematics, The University of North Carolina at Charlotte, USA)

A shock interaction problem is solved with finite difference methods for a hypersonic fiow of air with chemical reactions. If a body has two concave cornerst a secondary shock is formed in the shock layer and it meets the main shock *** the two shocks meet, the flow becomes singular at the interaction point, and a new main shock, a contact discontinuity and an expansion wave appear as a result of interaction between the two shocks. Therefore, the problem is very *** proper combinations of implicit and explicit finite difference schemes according to the property of the equations and the boundary conditions, we compute the fiow behind the interaction point successfully.

关键词： Flow Chen SHOCK INTERACTIONS IN NONEQUILIBIUM HYPERSONIC FLOW As

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