检索结果-南通市图书馆

Frontiers in Energy 2023年第3期17卷 332-379页

作者： Muhammad Tauseef NASIR Mirae kim Jaehwa LEE seungho kim Kyung Chun kim School of Mechanical Engineering Eco-friendly Smart Ship Parts Technology Innovation CenterPusan National UniversityBusan 46241South Korea School of Mechanical Engineering Pusan National UniversityBusan 46241South Korea Korea Gas Corporation Daegu 41062South Korea

In modern times,worldwide requirements to curb greenhouse gas emissions,and increment in energy demand due to the progress of humanity,have become a serious *** such scenarios,the effective and efficient utilization of the liquified natural gas(LNG)regasification cold energy(RCE),in the economically and environmentally viable methods,could present a great opportunity in tackling the core issues related to global warming across the *** this paper,the technologies that are widely used to harness the LNG RCE for electrical power have been *** systems incorporating,the Rankine cycles,Stirling engines,Kalina cycles,Brayton cycles,Allam cycles,and fuel cells have been ***,the economic and environmental studies apart from the thermal studies have also been ***,the discussion regarding the systems with respect to the regassification pressure of the LNG has also been *** aim of this paper is to provide guidelines for the prospective researchers and policy makers in their decision making.

关键词： liquified natural gas cold energy power generation

Long cycle-life aqueous Zn battery enabled by facile carbon nanotube coating on Cu current collector

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Carbon Energy 2024年第6期6卷 151-164页

作者： Beom-Keun Cho Sung-Ho Huh So Hee kim seungho Yu Jong-Seong Bae Jung-Keun Yoo Seung-Ho Yu Department of Chemical and Biological Engineering Korea UniversitySeoulRepublic of Korea Advanced Analysis Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)SeoulRepublic of Korea KIST School Division of Energy and Environment TechnologyKorea University of Science and TechnologySeoulRepublic of Korea Busan Center Korea Basic Science Institute(KBSI)BusanRepublic of Korea Carbon Composites Department Composites Research DivisionKorea Institute of Materials Science(KIMS)ChangwonRepublic of Korea

As an alternative to Li-ion batteries,aqueous Zn batteries have gained attention due to the abundance of Zn metal,low reduction potential(-0.76 V *** hydrogen electrode),and high theoretical capacity(820 mAh g-1)of multivalent Zn2+***,the growth of Zn dendrites and the formation of irreversible surface reaction byproducts pose challenges for ensuring a long battery lifespan and ***,the Cu foil coated with a single-walled carbon nanotube(SWCNT)layer using a facile doctor blade casting method is *** SWCNT-coated Cu foil demonstrates a significantly longer battery lifespan compared to the bare Cu in the half-cell *** operando optical microscopy imaging,we are able to provide intuitive evidence that Zn deposition occurs between the carbon nanotube(CNT)coating and Cu substrate,in agreement with the computational ***,with various imaging techniques,the flat morphology and homogeneous distribution of Zn beneath the SWCNT layer are *** addition,the full-cell using CNT-coated Cu exhibits a long cycle life compared to the control group,thereby demonstrating improved electrochemical performance with limited Zn for the cycling process.

关键词： aqueous Zn battery carbon nanotube operando imaging surface coating

Artificial optoelectronic synapse based on spatiotemporal irradiation to source-sharing circuitry of synaptic phototransistors

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

InfoMat 2024年第2期6卷 131-141页

作者： seungho Song Changsoon Choi Jongtae Ahn Je-Jun Lee Jisu Jang Byoung-Soo Yu Jung Pyo Hong Yong-Sang Ryu Yong-Hoon kim Do Kyung Hwang Center for Opto-Electronic Materials and Devices Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySuwonRepublic of Korea Center for Spintronics Post-Silicon Semiconductor InstituteKorea Institute of Science and Technology(KIST)SeoulRepublic of Korea Division of Nanoscience&Technology KIST SchoolUniversity of Science and Technology(UST)SeoulRepublic of Korea School of Biomedical Engineering Korea UniversitySeoulRepublic of Korea KU-KIST Graduate School of Converging Science and Technology Korea UniversitySeoulRepublic of Korea

To overcome the intrinsic inefficiency of the von Neumann architecture,neuromorphic devices that perform analog vector–matrix multiplication have been highlighted for achieving power-and time-efficient data *** particular,artificial synapses,of which conductance should be programmed to represent the synaptic weights of the artificial neural network,have been intensively researched to realize neuromorphic ***,inspired by excitatory and inhibitory synapses,we develop an artificial optoelectronic synapse that shows both potentiation and depression characteristics triggered only by optical *** design of the artificial optoelectronic synapse,in which excitatory and inhibitory synaptic phototransistors are serially connected,enables these characteristics by spatiotemporally irradiating the phototransistor channels with optical ***,a negative synaptic weight can be realized without the need for electronic components such as *** such attributes,the artificial optoelectronic synapse is demonstrated to classify three digits with a high recognition rate(98.3%)and perform image preprocessing via analog vector-matrix multiplication.

关键词： amorphous oxide semiconductor analog processing artificial synapse neuromorphic optoelectronics

Design the IoT Botnet Defense Process for Cybersecurity in Smart City

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Intelligent Automation & Soft Computing 2023年第9期37卷 2979-2997页

作者： Donghyun kim seungho Jeon Jiho Shin Jung Taek Seo Department of Information Security Gachon UniversitySeongnam13120Korea Department of Smart Security Gachon UniversitySeongnam13120Korea Police Science Institute Korean National Police UniversityAsan31539Korea Department of Computer Engineering Gachon UniversitySeongnam13120Korea

The smart city comprises various infrastructures,including health-care,transportation,manufacturing,and energy.A smart city’s Internet of Things(IoT)environment constitutes a massive IoT environment encom-passing numerous *** many devices are installed,managing security for the entire IoT device ecosystem becomes challenging,and attack vectors accessible to attackers ***,these devices often have low power and specifications,lacking the same security features as general Information Technology(IT)systems,making them susceptible to *** vulnerability is particularly concerning in smart cities,where IoT devices are connected to essential support systems such as healthcare and *** can lead to significant human and property *** rep-resentative attack that exploits IoT device vulnerabilities is the Distributed Denial of Service(DDoS)attack by forming an IoT *** a smart city environment,the formation of IoT botnets can lead to extensive denial-of-service attacks,compromising the availability of services rendered by the ***,the same IoT devices are typically employed across various infrastructures within a smart city,making them potentially vulnerable to similar *** paper addresses this problem by designing a defense process to effectively respond to IoT botnet attacks in smart city *** proposed defense process leverages the defense techniques of the MITRE D3FEND framework to mitigate the propagation of IoT botnets and support rapid and integrated decision-making by security personnel,enabling an immediate response.

关键词： Smart city IoT botnet cybersecurity

Efficient solar fuel production enabled by an iodide oxidation reaction on atomic layer deposited MoS_(2)

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Carbon Energy 2023年第12期5卷 200-214页

作者： Young Sun Park Gyumin Jang Inkyu Sohn Hyungsoo Lee Jeiwan Tan Juwon Yun Sunihl Ma Jeongyoub Lee Chan Uk Lee Subin Moon Hayoung Im Seung-Min Chung seungho Yu Hyungjun kim Jooho Moon Department of Materials Science and Engineering Yonsei UniversitySeoulRepublic of Korea School of Electrical and Electronic Engineering Yonsei UniversitySeoulRepublic of Korea Energy Storage Research Center Korea Institute of Science and TechnologySeoulRepublic of Korea

Oxygen evolution reaction(OER)as a half-anodic reaction of water splitting hinders the overall reaction efficiency owing to its thermodynamic and kinetic *** oxidation reaction(IOR)with low thermodynamic barrier and rapid reaction kinetics is a promising alternative to the ***,we present a molybdenum disulfide(MoS_(2))electrocatalyst for a high-efficiency and remarkably durable anode enabling ***_(2)nanosheets deposited on a porous carbon paper via atomic layer deposition show an IOR current density of 10 mA cm^(–2)at an anodic potential of 0.63 V with respect to the reversible hydrogen electrode owing to the porous substrate as well as the intrinsic iodide oxidation capability of MoS_(2)as confirmed by theoretical *** lower positive potential applied to the MoS_(2)-based heterostructure during IOR electrocatalysis prevents deterioration of the active sites on MoS_(2),resulting in exceptional durability of 200 ***,we fabricate a two-electrode system comprising a MoS_(2)anode for IOR combined with a commercial Pt@C catalyst cathode for hydrogen evolution ***,the photovoltaic–electrochemical hydrogen production device comprising this electrolyzer and a single perovskite photovoltaic cell shows a record-high current density of 21 mA cm^(–2)at 1 sun under unbiased conditions.

关键词： iodide oxidation reaction molybdenum sulfide photovoltaic-electrochemical hydrogen production solar hydrogen

Optimally arranged TiO_(2)@MoS_(2) heterostructures with effectively induced built-in electric field for high-performance lithium-sulfur batteries

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

能源化学:英文版 2023年第8期83卷 496-508,I0012页

作者： Jeongyoub Lee Changhoon Choi Jung Been Park seungho Yu Jinho Ha Hyungsoo Lee Gyumin Jang Young Sun Park Juwon Yun Hayoung Im Subin Moon Soobin Lee Jung-Il Choi Dong-Wan kim Jooho Moon Department of Materials Science and Engineering Yonsei UniversitySeoul 03722Republic of Korea School of Civil Environmental and Architectural EngineeringKorea UniversitySeoul 02841Republic of Korea Energy Storage Research Center Korea Institute of Science and Technology(KIST)Seoul 02792Republic of Korea School of Mathematics and Computing(Computational Science and Engineering) Yonsei UniversitySeoul 03722Republic of Korea

To overcome the serious technological issues affecting lithium-sulfur(Li-S) batteries,such as sluggish sulfur redox kinetics and the detrimental shuttle effect,heterostructure engineering has been investigated as a strategy to effectively capture soluble lithium polysulfide intermediates and promote their conversion reaction by integrating highly polar metal oxides with catalytically active metals ***,to fully exploit the outstanding properties of heterostructure-based composites,their detailed structure and interfacial contacts should be designed ***,optimally arranged TiO_(2)and MoS_(2)-based heterostructures(TiO_(2)@MoS_(2)) are fabricated on carbon cloth as a multifunctional interlayer to efficiently trap polysulfide intermediates and accelerate their redox *** to the synergistic effects between TiO_(2)and MoS_(2)and the uniform heterointerface distribution that induces the ideally oriented built-in electric field,Li-S batteries with TiO_(2)@MoS_(2)interlayers exhibit high rate capability(601 mA h g^(-1)at 5 C),good cycling stability(capacity-fade rate of 0.067% per cycle over 500 cycles at2 C),and satisfactory areal capacity(5.2 mA h cm^(-2)) under an increased sulfur loading of 5.2 mg cm^(-2).Moreover,by comparing with a MoS_(2)@TiO_(2)interlayer composed of reversely arranged heterostructures,the effect of the built-in electric field’s direction on the electrocatalytic reactions of polysulfide intermediates is thoroughly investigated for the first *** superior electrocatalytic activities of the rationally arranged TiO_(2)@MoS_(2)interlayer demonstrate the importance of optimizing the built-in electric field of heterostructures for producing high-performance Li-S batteries.

关键词： Lithium-sulfur batteries Shuttle effect TiO_(2)-MoS_(2)heterostructure engineering Built-in electric field Multifunctional interlayers

Effects of Cr doping on structural and electrochemical properties of Li_(4)Ti_(5)O_(12) nanostructure for sodium-ion battery anode

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

Journal of Energy Chemistry 2021年第8期30卷 465-472,I0010页

作者： Sang Hyuk Gong Ji Hyeon Lee Dong Won Chun Jee-Hwan Bae Sung-Chul kim seungho Yu Sahn Nahm Hyung-Seok kim Center for Energy Storage Research Korea Institute of Science and Technology5Hwarang-ro 14-gilSeongbuk-gu02792 SeoulRepublic of Korea Department of Materials Science and Engineering Korea University145Anam-roSeongbuk-gu02841 SeoulRepublic of Korea Department of Chemical and Biological Engineering Korea University145Anam-roSeongbuk-gu02841 SeoulRepublic of Korea Advanced Analysis Center Korea Institute of Science and Technology5Hwarang-ro 14-gilSeongbuk-gu02792 SeoulRepublic of Korea

Sodium-ion batteries are considered as promising alternatives to lithium-ion batteries,owing to their low cost and abundant raw *** the several candidate materials for the anode,spinel-type Li_(4)Ti_(5)O_(12)has potential owing to its superior safety originating from an appropriate operating voltage and the reversible Na^(+)intercalation ***,a low diffusion coefficient for Na^(+)and the insulating nature of LTO remains challenging for practical sodium-ion battery ***,we present a strategy for integrating physical and chemical approaches to achieve superior electrochemical properties in *** demonstrate that carefully controlling the amount of Cr doping is crucial to enhance the electrochemical properties of nanostructured *** Cr doped LTO shows a superior reversible capacity of 110 m Ah g^(-1) after 400 cycles at 1 C,with a three-fold higher capacity(75 m Ah g^(-1))at 10 C compared with undoped LTO *** suggests that appropriately Cr doped nanostructured LTO is a promising anode material for sodium-ion batteries.

关键词： Sodium-ion batteries Spinel type Li_(4)Ti_(5)O_(12) Anode materials Nanostructuring Cr-doping

Efficacy and safety of a patient-positioning device(EZ-FIX)for endoscopic retrograde cholangiopancreatography

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

World Journal of Gastroenterology 2015年第19期21卷 5995-6000页

作者： seungho Lee Joung-Ho Han Hee Seung Lee Ki Bae kim In-kwang Lee Eun-Jong Cha Young Duck Shin Namgyu Park Seon Mee Park Department of Internal Medicine College of Medicine Chungbuk National University Department of Biomedical Engineering Chungbuk National University College of Medicine Department of Anesthesiology Chungbuk National University College of Medicine

AIM: To assess the efficacy and safety of a patientpositioning device(EZ-FIX) for endoscopic retrograde cholangiopancreatography(ERCP).METHODS: A total of 105 patients were randomized to the EZ-FIX(n = 53) or non-EZ-FIX(n = 52) group in this prospective study. Midazolam and propofol,titrated to provide an adequate level of sedation during therapeutic ERCP, were administered by trained registered nurses under endoscopist *** outcome measures were the total dose of propofol and sedative-related complications, including hypoxia and hypotension. Secondary outcome measures were recovery time and sedation satisfaction of the endoscopist, nurses, and ***: There was no significant difference in the rate of hypoxia, but there was a statistical trend(EX-FIX group; n = 4, 7.55%, control group; n = 6, 11.53%,P = 0.06). The mean total dose of propofol was lower in the EZ-FIX group than in the non-EZ-FIX group(89.43 ± 49.8 mg vs 112.4 ± 53.8 mg, P = 0.025).In addition, the EZ-FIX group had a shorter mean recovery time(11.23 ± 4.61 mg vs 14.96 ± 5.12 mg, P< 0.001). Sedation satisfaction of the endoscopist and nurses was higher in the *** group than in the nonEZ-FIX group. Technical success rates of the procedure were 96.23% and 96.15%, respectively(P = 0.856).Procedure-related complications did not differ by group(11.32% vs 13.46%, respectively, P = 0.735).CONCLUSION: Using EZ-FIX reduced the total dose of propofol and the recovery time, and increased the satisfaction of the endoscopist and nurses.

关键词： EZ-FIX Patient-positioning device Propofol Sedation Endoscopic retrograde cholangiopancrea tography

A Study on the Pressure Values of Contrast Media Injecting for the Prevention of Extravasations used Extravasation Detector

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

A Study on the Pressure Values of Contrast Media Injecting f...