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Distributed Coordinator Election Scheme for QoS Support and Seamless Connectivity in WPANs

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journal of Computer Science & Technology 2009年第6期24卷 1138-1148页

作者： Soon-Gyu Jeong sang-jo yoo Graduate School of Information Technology & Telecommunications Inha University

Wireless personal area networks （WPANs） are formed in a relatively small area, and coordinator that serves as a central control device plays an important role in the operation and organization of a piconet. Typical applications of WPANs include home automation systems, security systems and health monitoring systems. In these types of systems, guaranteeing seamless connectivity is very important, and communications cannot take place when the coordinator malfunctions. Thus, in the case of a breakdown, it is necessary to elect a new coordinator as soon as possible. For this reason, a distributed coordinator election scheme （DCES） is proposed that considers not only QoS support but also network connectivity in an effort to avoid possible network partition. Simulation results show that the proposed scheme can elect a new coordinator while maintaining QoS and guaranteeing connectivity for a limited period.

关键词： QoS seamless connectivity leader election piconet coordinator (PNC) wireless personal area network (WPAN)

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

Inhibitory Mechanisms of Water Extract of Oplopanax elatus on Lipopolysaccharide-lnduced Inflammatory Responses in RAW 264.7 Murine Macrophage Cells

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Chinese journal of Integrative Medicine 2020年第9期26卷 670-676页

作者： Ki Sun Kwon Hyun Lim Yong Soo Kwon Myong jo Kim Ji Hye yoo Nam Ho yoo Hyun Pyo Kim College of Pharmacy Kangwon National UniversityChuncheon(24341)Republic of Korea Department of Bio-Resource Sciences Kangwon National UniversityChuncheon(24341)Republic of Korea Bioherb Research Institute Kangwon National UniversityChuncheon(24341)Republic of Korea

Objective:To study the anti-inflammatory action and cellular mechanism of Oplopanax ***:A hot water extract of OE(WOE)was prepared and a major constituent,syringin,was successfully *** content in WOE was found to be 214.0 p.g/g dried plant(w/w).Their anti-inflammatory activities were examined using RAW 264.7 macrophages and a mouse model of croton oil-induced ear ***:In lipopolysaccharide(LPS)-treated RAW 264.7 cells,a mouse macrophage cell line,WOE was found to significantly and strongly inhibit cyclooxygenase-2(COX-2)-induced prostaglandin E2(PGE2)production[half maximal inhibitory concentration(IC50)=135.2μg/mL]and inducible nitric oxide synthase(iNOS)-induced NO production(IC50=242.9μg/mL).In the same condition,WOE was revealed to inhibit NO production by downregulating iNOS expression,mainly by interrupting mitogen activated protein kinases(MAPKs)/activator protein-1(AP-1)*** activation of all three major MAPKs,p38 MAPK,extracellular signal-regulated kinase(ERK),and c-Jun N-terminal kinase,was inhibited by WOE(50-300μg/mL).On the other hand,WOE reduced PGE2 production by inhibiting COX-2 enzyme activity,but did not affect COX-2 expression *** addition,WOE inhibited the production of proinflammatory cytokines such as interleukin-6 and tumor necrosis factor-α.In croton oil-induced ear edema in mice,oral administration of WOE(50-300 mg/kg)dose-dependently inhibited edematic ***:Water extract of OE exhibited multiple anti-inflammatory action mechanisms and may have potential for treating inflammatory disorders.

关键词： Oplopanax elatus Chinese medicine stem syringin anti-inflammation RAW 264.7

Small cell carcinoma of the liver and biliary tract without jaundice

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World journal of Gastroenterology 2013年第44期19卷 8146-8150页

作者： Jae-Min jo yoo-Kyung Cho Chang-Lim Hyun Kyoung-Hee Han Ji-Young Rhee Jung-Mi Kwon Woo-Kun Kim sang-Hoon Han Department of Internal Medicine Jeju National University Hospital Jeju-si 890-716 Jeju Self-Governing Province South Korea Department of Pathology Jeju National University Hospital Jeju-si 890-716 Jeju Self-Governing ProvinceSouth Korea Jeju National University School of Medicine Jeju-si 890-716 Jeju Self-Governing Province South Korea

An 80-year-old woman presenting with chest pain was found to have a large,lobulated soft tissue mass in the liver and nearby tissues on abdominal computed tomography(CT).The tumor had invaded the common hepatic artery and main portal *** developed 4 wk later,at which point,a pancreas and biliary CT scan revealed a large mass in the right lobe of the liver and a hilar duct obstruction,which was found to be a small cell *** its rarity,liver and bile duct small cell carcinoma should be considered in the differential diagnosis of atypical chest pain without jaundice.

关键词： Extrapulmonary small cell carcinoma Jaundice Liver mass Bile duct mass Neuroendocrine tumor

Understanding of the Relationship between the Properties of Cu(In,Ga)Se_(2) Solar Cells and the Structure of Ag Network Electrodes

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Energy & Environmental Materials 2024年第6期7卷 246-253页

作者： Hyesun yoo Hoang Van Quy Inpyo Lee Seung Taek jo Tae Ei Hong JunHo Kim Dae-Hwang yoo Jinwook Shin Walter Commerell Dae-Hwan Kim jong Wook Roh Regional Leading Research Center(RLRC)of Smart Energy System Kyungpook National UniversityGyeongsangbuk-do 37224Korea Division of Energy Technology DaeguGyeongbuk Institute of Science and Technology(DGIST)Daegu 42988Korea Department of Hydrogen and Renewable Energy Kyungpook National UniversityDaegu 47922Korea Nano Photoelectronic Device Lab Department of PhysicsIncheon National UniversityIncheon 22012Korea Institute for Energy and Drive Technology Technische Hochschule Ulm(THU)Ulm 89081Germany Department of Nano&Advanced Materials Science and Engineering Kyungpook National UniversityGyeongsangbuk-do 37224Korea

The relation between the structure of the silver network electrodes and the properties of Cu(In,Ga)Se_(2)(CIGS)solar cells is systemically *** Ag network electrode is deposited onto an Al:ZnO(AZO)thin film,employing a self-forming cracked *** control over the cracked template's structure is achieved through careful adjustment of temperature and *** Ag network electrodes with different coverage areas and network densities are systemically applied to the CIGS solar *** is revealed that predominant fill factor(FF)is influenced by the figure of merit of transparent conducting electrodes,rather than sheet resistance,particularly when the coverage area falls within the range of 1.3–5%.Furthermore,a higher network density corresponds to an enhanced FF when the coverage areas of the Ag networks are *** utilizing a thinner AZO film,CIGS solar cells with a surface area of 1.0609 cm^(2)exhibit a notable performance improvement,with efficiency increasing from 10.48%to 11.63%.This enhancement is primarily attributed to the increase in FF from 45%to 65%.These findings underscore the considerable potential for reducing the thickness of the transparent conductive oxide(TCO)in CIGS modules with implications for practical applications in photovoltaic technology.

关键词： CIGS large-area solar cell metal mesh metallic network transparent electrode

Effect of Re Addition and Withdrawal Rate on the Solidification Behavior of Directionally Solidified Superalloy AM3

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journal of Materials Science & Technology 2011年第2期27卷 101-106页

作者： F.Long Y.S.yoo S.M.Seo T.Jin Z.Q.Hu C.Y.jo Institute of Metal Research Chinese Academy of SciencesShenyang 110016China High Temperature Materials Laboratory Korea Institute of Materials Sciences66 Sangnam-dongChangwonKyungunamKorea

The influence of Re addition and withdrawal rate on the solidification behavior of the first generation single crystal superalloy AM3 was investigated by directional solidification and quenching *** primary dendrite arm spacing and eutectic volume fraction were measured from directionally solidified superalloy AM3 with different Re *** is found that the primary dendrite arm spacing is determined by the withdrawal rate,and Re does not influence on the *** eutectic fraction increases with increasing Re *** coeffcients of alloying elements were investigated with energy-dispersive X-ray spectrometry（EDS） *** data was submitted to a statistical treatment to establish the solidification path,and the partition coeficients were measured by fitting the curve with a modified Scheil *** is shown that the addition of Re results in bigger microsegregation of alloying elements in directionally solidified AM3 superalloy.

关键词： Superalloy AM3 Re addation Directional solidification

EFFECT OF CARBON AND BORON ON MICROSTRUCTURE AND MECHANICAL PROPERTIES OF A SINGLE CRYSTAL SUPERALLOY RR 2072

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Acta Metallurgica Sinica(English Letters) 2005年第1期18卷 33-38页

作者： D.H.Kim D.H.Ye J.H.Lee Y.S.yoo C.Y.jo High Temperature Materials Laboratory Korea Institute of Machinery&Materials 66 SangnamChangwonKyungnam 640-010S.Korea Dept.of Metallurgy Changwon National Univerisity 9 SarimChagwonKyungnam 640-773S.Korea

Carbon and boron have been considered to strengthen grain boundaries that might form during single crystal *** this study the effect of boron on solidification behavior and creep properties of the carbon doped single crystal RR 2072 has been *** order to understand solidification behavior with boron addition,the solid/liquid interface morphology and solidification microstructure were examined with solidification *** relationship between mi-crostructural evolution and creep properties of the carbon and boron modified single crystal has been also investigated.

关键词： single crystal superalloy defect tolerance directional solidification creep rupture

An investigation of the microstructural effects on the mechanical and electrochemical properties of a friction stir processed equiatomic CrMnFeCoNi high entropy alloy

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journal of Materials Science & Technology 2021年第28期87卷 60-73页

作者： Sam Yaw Anaman Solomon Ansah Hoon-Hwe Cho Min-Gu jo Jin-yoo Suh Minjung Kang jong-Sook Lee Sung-Tae Hong Heung Nam Han Department of Materials Science and Engineering Hanbat National University125 Dongseodae-roYuseong-GuDaejeonRepublic of Korea Center for Energy Materials Research Clean Energy InstituteKorea Institute of Science and TechnologySeoul02792Republic of Korea Department of Materials Science and Engineering&Research Institute of Advanced Materials Seoul National University1Gwanak-roGwanak-guSeoul08826Republic of Korea Advanced Functional Technology R&D Department Korea Institute of Industrial TechnologyIncheon21999Republic of Korea School of Materials Science and Engineering Chonnam National UniversityGwangju61186Republic of Korea School of Mechanical Engineering University of UlsanUlsan680-749Republic of Korea

The electrochemical properties of a friction stir processed(FSPed)equiatomic CrMnFeCoNi high-entropy alloy(HEA)was investigated in an aerated 0.5 M Na_(2)SO_(4) electrolyte solution at room *** microstructural analysis reveals a highly refined stir zone(SZ)with an average grain size that decreases from the top region of the SZ to the bottom region of the SZ(also known as shear-processed zone;SPZ).However,the region below the SPZ,(*** the plunge depth)experienced an increase in average grain size and dislocation densities compared to the other *** is no secondary phase observed in the FSPed region,however,the microstructural evolution in the FSPed region affects the electrochemical behavior of the ***_(2)O_(3) passive layer was observed to form on the FSPed HEA,leading to excellent corrosion properties from the polarization corrosion *** refinement in the SZ enhances the rapid formation of the passive layer,thus,leading to better corrosion properties in the front surface of the FSPed *** localized corrosion behavior of the FSPed HEA was predicted to be caused by the micro-galvanic nature of the HEA,which leads to an increase in polarization at the anodic sites(pits).A numerical model was established using the corrosion parameters from the experiment to simulate the localized corrosion behavior on the surface of the FSPed HEA in a neutral *** predicted initial pitting potential and corresponding current density agree well with the experimental *** model is also capable of tracking the dissolution of the pits over longer periods.

关键词： High entropy alloys Friction stir processing Grain refinement Passive film Pitting Simulation