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Multifunctional MXene/Carbon Nanotube Janus Film for Electromagnetic Shielding and Infrared Shielding/Detection in Harsh Environments

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Nano-Micro Letters 2024年第10期16卷 543-560页

作者： Tufail Hassan Aamir Iqbal Byungkwon yoo Jun Young jo Nilufer Cakmakci Shabbir Madad Naqvi Hyerim Kim Sungmin Jung Noushad Hussain Ujala Zafar Soo Yeong Cho Seunghwan Jeong Jaewoo Kim Jung Min Oh sangwoon Park Youngjin Jeong Chong Min Koo School of Advanced Materials Science and Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea Department of Materials Science and Engineering Soongsil UniversitySeoul 06978Republic of Korea Institute of Advanced Composite Materials Korea Institute of Science and Technology92 Chudong-roBongdong-eupWanju-gunJeollabuk-do 55324Republic of Korea R&D Center INNOMXENE Co. Ltd.Daejeon 34365Republic of Korea School of Chemical Engineering Sungkyunkwan UniversitySeobu-ro 2066Jangan-guSuwon-siGyeonggi-do 16419Republic of Korea

Multifunctional,flexible,and robust thin films capable of operating in demanding harsh temperature environments are crucial for various cutting-edge *** study presents a multifunctional Janus film integrating highly-crystalline Ti_(3)C_(2)T_(x) MXene and mechanically-robust carbon nanotube(CNT)film through strong hydrogen *** hybrid film not only exhibits high electrical conductivity(4250 S cm^(-1)),but also demonstrates robust mechanical strength and durability in both extremely low and high temperature environments,showing exceptional resistance to thermal *** hybrid Janus film of 15μm thickness reveals remarkable multifunctionality,including efficient electromagnetic shielding effectiveness of 72 dB in X band frequency range,excellent infrared(IR)shielding capability with an average emissivity of 0.09(a minimal value of 0.02),superior thermal camouflage performance over a wide temperature range(−1 to 300℃)achieving a notable reduction in the radiated temperature by 243℃ against a background temperature of 300℃,and outstanding IR detection capability characterized by a 44%increase in resistance when exposed to 250 W IR *** multifunctional MXene/CNT Janus film offers a feasible solution for electromagnetic shielding and IR shielding/detection under challenging conditions.

关键词： MXene/carbon nanotube Janus film Electromagnetic interference shielding Infrared shielding Thermal camouflage Infrared detection

A Novel Goodness of Fit Test Spectrum Sensing Using Extreme Eigenvalues

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Chinese journal of Electronics 2020年第6期29卷 1201-1206页

作者： LI He ZHAO Wenjing LIU Chang JIN Minglu yoo sang-jo School of Information and Communication Engineering Dalian University of Technology Department of Information and Communication Engineering Inha University

The existing Goodness of fit(GoF) test based spectrum sensing algorithms mostly use samples or energies as observations to make decisions,which can hardly achieve satisfactory performance especially when the Primary user(PU) signals are highly ***,the eigenvalue of covariance matrix can reflect signal correlations *** by this,we study the distribution of eigenvalue and propose an eigenvalue based GoF spectrum sensing *** the proposed scheme,we use the ratios of maximum to minimum eigenvalue as observations and thus it can bring performance improvements through capturing correlation of PU *** also provide the related theoretical analysis for the proposed *** results show that the proposed method overcomes the problem of noise uncertainty and achieves performance improvement over the classical samples-based GoF test.

关键词： eigenvalue based GoF spectrum sensing algorithm GoF test based spectrum sensing algorithm primary user signal covariance matrix eigenvalue Radio links and equipment eigenvalues and eigenfunctions signal detection Algebra goodness of fit test spectrum sensing algorithm Linear algebra (numerical analysis) signal sampling signal denoising radio spectrum management correlation methods covariance matrices Signal detection signal correlation

Diffusionless-Like Transformation Unlocks Pseudocapacitance with Bulk Utilization: Reinventing Fe_(2)O_(3) in Alkaline Electrolyte

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Energy & Environmental Materials 2023年第1期6卷 145-154页

作者： Taowen Dong Wencai Yi Ting Deng Tingting Qin Xianyu Chu He Yang Lirong Zheng Seung jo yoo Jin-Gyu Kim Zizhun Wang Yan Wang Wei Zhang Weitao Zheng State Key Laboratory of Automotive Simulation and Control and School of Materials Science&EngineeringKey Laboratory of Automobile Materials MOEand Electron Microscopy Centerand International Center of Future ScienceJilin UniversityChangchun 130012China Laboratory of High Pressure Physics and Material Science(HPPMS) School of Physics and Physical EngineeringQufu Normal UniversityQufu 273165China Beijing Synchrotron Radiation Facility Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China Electron Microscopy Research Center Korea Basic Science InstituteDaejeon 34133South Korea Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China IKERBASQUE Basque Foundation for ScienceBilbao 48013Spain

Energy density can be substantially raised and even maximized if the bulk of an electrode material is fully *** metal oxides based on conversion reaction mechanism are the imperative choice due to either constructing nanostructure or intercalation pseudocapacitance with their intrinsic ***,the fully bulk utilization of transition metal oxides is hindered by the poor understanding of atomic-level conversion reaction mechanism,particularly it is largely missing at clarifying how the phase transformation(conversion reaction)determines the electrochemical performance such as power density and cyclic ***,α-Fe_(2)O_(3) is a case provided to claim how the diffusional and diffusionless transformation determine the electrochemical behaviors,as of its conversion reaction mechanism with fully bulk utilization in alkaline ***,the discharge productα-FeOOH diffusional from Fe(OH)2 is structurally identified as the atomic-level arch criminal for its cyclic stability deterioration,whereas the counterpartδ-FeOOH is theoretically diffusionless-like,unlocking the full potential of the pseudocapacitance with fully bulk ***,such pseudocapacitance,in proof-of-concept and termed as conversion pseudocapacitance,is achieved via diffusionless-like *** work not only provides an atomic-level perspective to reassess the potential electrochemical performance of the transition metal oxides electrode materials based on conversion reaction mechanism but also debuts a new paradigm for pseudocapacitance.

关键词： bulk utilization,conversion pseudocapacitance diffusionless transformation Fe_(2)O_(3) phase transformation

Laparoscopic anatomical versus non-anatomical liver resection for hepatocellular carcinoma in the posterosuperior segments:a propensity score matched analysis

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Hepatobiliary Surgery and Nutrition 2023年第6期12卷 824-834,I0001页

作者： Boram Lee Jai Young Cho Ho-Seong Han yoo-Seok yoon Hae Won Lee Jun Suh Lee Moonhwan Kim Yeongsoo jo Department of Surgery Seoul National University Bundang HospitalSeoul National University College of MedicineSeongnamKorea

Background:Since laparoscopic anatomical resection(LAR)for tumors,especially located in the posterosuperior(PS)segments of the liver remains difficult,laparoscopic non-anatomical resection(LNAR)are generally *** compare the clinical outcomes between LAR and LNAR for hepatocellular carcinoma(HCC)located in the PS ***:We retrospectively reviewed the data for 1,029 patients who underwent hepatectomy for HCC between 2004 and *** 167 patients who underwent laparoscopic hepatectomy for HCC in PS segments,64 underwent LNAR and 103 underwent *** were matched one-to-one using propensity score matching(46:46).Results:LNAR was associated with significantly shorter operation time(P=0.001),lower estimated blood loss(P=0.001),lower transfusion rate(P=0.006)and shorter hospital stay(P=0.012)than *** respective 1-,3-,and 5-year overall survival rates(LAR:95.3%,87.1%,and 77.8%;LNAR:96.7%,91.6%,and 85.0%;P=0.262)and recurrence-free survival rates(LAR:75.7%,70.3%,and 68.9%;LNAR:81.8%,58.3%,and 55.3%;P=0.879)were *** intrahepatic recurrence rate was significantly higher in LNAR group than in LAR group(78.6%vs.57.1%,P=0.023),but the post-recurrence treatments differed significantly between the two groups(P=0.016);the re-resection rate was much greater in the LNAR group(45.0%vs.0%)*** respective 1-,3-,and 5-year post-recurrence survival rates were similar in the LAR and LNAR groups(P=0.212).After recurrence,survival in re-resection group was significantly greater than not(P=0.026).Conclusions:LNAR is safe and feasible for HCC located in PS segments,and provided acceptable oncologic outcomes that are comparable to those of *** can be considered for patient with tumor located in PS segment when LAR is not feasible.

关键词： Laparoscopy hepatectomy carcinoma,hepatocellular recurrence

Online Predictive Monitoring and Prediction Model for a Periodic Process Through Multiway Non-Gaussian Modeling

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Chinese journal of Chemical Engineering 2008年第1期16卷 48-51页

作者： Changkyoo yoo Minhan Kim Sunjin Hwang Yongmin jo jongmin Oh College of Environmental and Applied Chemistry Green Energy Center Kyung Hee University Gyeonggi-Do 446-701 Korea

一新为周期的生物过程的联机预兆的监视和预言模型被建议用多方法 non-Gaussian 建模。这条途径的基本想法是多使用方法 non-Gaussian 当模特儿在一个周期的过程从每日的正常操作数据提取某主导的关键组分，并且随后把这些部件与预兆的... 详细信息

一新为周期的生物过程的联机预兆的监视和预言模型被建议用多方法 non-Gaussian 建模。这条途径的基本想法是多使用方法 non-Gaussian 当模特儿在一个周期的过程从每日的正常操作数据提取某主导的关键组分，并且随后把这些部件与预兆的统计过程监视相结合技术。建议预兆的监视方法被使用了在生物废水处理过程指责察觉和诊断，它基于强壮日报特征。结果显示出力量和优点连续法的建议预兆的监视用多方法预兆监视概念，它因此能为一个每日的监视过程并且也给很有用的概念的结果比另外的传统的监视方法启用过程差错的更快速的察觉。

关键词：非高斯建模方法间歇过程在线预测监控模型预测模型

Efficient ORR catalysts for zinc-air battery: Biomass-derived ultra-stable Co nanoparticles wrapped with graphitic layers via optimizing electron transfer

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journal of Energy Chemistry 2022年第7期31卷 211-218,I0006页

作者： Yu Feng Kexin Song Wei Zhang Xinyan Zhou Seung jo yoo Jin-Gyu Kim Sifan Qiao Yugang Qi Xu Zou Zhongjun Chen Tingting Qin Nailin Yue Zizhun Wang Dabing Li Weitao Zheng State Key Laboratory of Automotive Simulation and Control School of Materials Science&EngineeringKey Laboratory of Automobile Materials MOEElectron Microscopy Centerand International Center of Future ScienceJilin UniversityJilin UniversityChangchun 130012JilinChina Division of Scientific Instrumentation&Management Korea Basic Science InstituteDaejeon 34133Republic of Korea Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China State Key Laboratory of Luminescence and Applications Changchun Institute of OpticsFine Mechanics and PhysicsChinese Academy of SciencesChangchun 130033JilinChina

The poor stability of non-noble metal catalysts in oxygen reduction reaction(ORR) is a main bottleneck that limits their big-scale application in metal-air batteries. Herein, we construct a chainmail catalyst(Co-NC-AD) with outstanding stability, via the competitive complexation and post absorption strategy,consisting of highly graphitic layers wrapped uniform-size Co nanoparticles(Co-NPs). Experiments combined with density functional theory(DFT) calculations jointly confirmed that the electron transfer occurred from the inner Co-NPs to the external graphitic layers. It facilitated the adsorption process of oxygen molecules and the hybridization of the O-2 p and C-1 p orbitals, which accelerated the ORR reaction kinetics. Consequently, our prepared Co-NC-AD shows excellent ORR activity, offered with a more positive initial potential(E_(onset)= 0.95 V) and half-wave potential(E_(1/2)= 0.86 V). The remarkable stability and resistance of methanol poisoning are merited from the protection effect of stable graphitic layers. In addition, the high electrochemical performance of Co-NC-AD-based zinc-air battery demonstrates their potential for practical applications. Therefore, our work provides new ideas for the design of nanoconfined catalysts with high stability and activity.

关键词： Chainmail catalyst Graphitic layers Co nanoparticles Oxygen reduction reaction

LongLine:Visual Analytics System for Large-scale Audit Logs

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Visual Informatics 2018年第1期2卷 82-97页

作者： Seunghoon yoo Jaemin jo Bohyoung Kim Jinwook Seo Seoul National University Korea Hankuk University of Foreign Studies Korea

Audit logs are different from other software logs in that they record the most primitive events(i.e.,system calls)in modem operating *** logs contain a detailed trace of an operating system,and thus have received great attention from security experts and system ***,the complexity and size of audit logs,which increase in real time,have hindered analysts from understanding and analyzing *** this paper,we present a novel visual analytics system,LongLine,which enables interactive visual analyses of large-scale audit *** lowers the interpretation barrier of audit logs by employing human-understandable representations(e.g.,file paths and commands)instead of abstract indicators of operating systems(e.g.,file descriptors)as well as revealing the temporal patterns of the logs in a multi-scale fashion with meaningful granularity of time in mind(e.g.,hourly,daily,and weekly).LongLine also streamlines comparative analysis between interesting subsets of logs,which is essential in detecting anomalous behaviors of *** addition,LongLine allows analysts to monitor the system state in a streaming fashion,keeping the latency between log creation and visualization less than one ***,we evaluate our system through a case study and a scenario analysis with security experts.

关键词： Visual Analytics Log Visualization Multidimensional Data

Effects of Cu addition on formability and surface delamination phenomenon in high-strength high-Mn steels

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journal of Materials Science & Technology 2020年第8期36卷 44-51页

作者： Min Chul jo Jisung yoo Min Cheol jo Alireza Zargaran Seok Su Sohn Nack J.Kim Sunghak Lee Center for Advanced Aerospace Materials Pohang University of Science and TechnologyPohang 37673South Korea Graduate Institute of Ferrous Technology Pohang University of Science and TechnologyPohang 37673South Korea Department of Materials Science and Engineering Korea UniversitySeoul 02841South Korea

The formability of austenitic high-Mn steels is a critical issue in automotive applications under nonuniformly-deformed environments caused by dynamic strain *** austenite stabilizing alloying elements in those steels,Cu has been known as an effective element to enhance tensile properties via controlling the stacking fault energy and stability of *** effects of Cu addition on formability,however,have not been sufficiently reported *** this study,the Cu addition effects on formability and surface characteristics in the austenitic high-Mn TRIP steels were analyzed in consideration of inhomogeneous microstructures containing the segregation of Mn and *** reveal determining factors,various mechanical parameters such as total elongation,post elongation,strain hardening rate,normal anisotropy,and planar anisotropy were correlated to the hole-expansion and cup-drawing test *** respect to microstructural parameters,roles of(Mn,Cu)-segregation bands and resultant Cu-rich FCC precipitates on the formability and surface delamination were also discussed.

关键词： High-Mn steel Cu effects Cu-rich FCC phase Hole-expansion test Formability Stretch-flangeablity Surface delamination

Intra-arterial lipo-prostaglandin E1 infusion for arterial spasm in liver transplantation:A case report

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World journal of Clinical Cases 2023年第34期11卷 8153-8157页

作者： Moonhwan Kim Hae Won Lee Chang Jin yoon Boram Lee Yeongsoo jo Jai Young Cho yoo-Seok yoon Jun Suh Lee Ho-Seong Han Department of Surgery Seoul National University Bundang HospitalSeoul National University College of MedicineSeongnam-si 13620Gyeonggi-doSouth Korea Department of Radiology Seoul National UniversitySeongnam 463-707South Korea

BACKGROUND Hepatic artery obstruction is a critical consideration in graft outcomes after living donor liver *** report a case of diffuse arterial vasospasm that developed immediately after anastomosis and was managed with an intra-arterial infusion of lipo-prostaglandin E1(PGE1).CASE SUMMARY A 57-year-old male with hepatitis B virus-related liver cirrhosis and hepatocellular carcinoma underwent ABO-incompatible living donor liver *** grafted hepatic artery was first anastomosed to the recipient’s right hepatic artery ***,the arterial pulse immediately *** a new anastomosis was performed using the right gastroepiploic artery,the patient’s arterial pulse rate remained *** attempted angiographic intervention immediately after the operation;it showed diffuse arterial vasospasms like‘beads on a string’.We attempted continuous infusion of lipo-PGE1 overnight via an intra-arterial *** next day,arterial flow improved without any spasms or *** patient had no additional arterial complications or related sequelae at the time of writing,1-year post-liver *** Angiographic evaluation is helpful in cases of repetitive arterial obstruction,and intra-arterial infusion of lipo-PGE1 may be effective in treating diffuse arterial spasms.

关键词： Liver transplantation Hepatic artery Vasospasm Prostaglandin E1 Intervention Case report