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Body-centered-cubic martensite and the role on room-temperature tensile properties in Si-added SiVCrMnFeCo high-entropy alloys

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Journal of Materials Science & Technology 2021年第17期76卷 222-230页

作者： Yong Hee Jo Junha Yang Won-Mi Choi kyung-Yeon Doh Donghwa Lee Hyoung Seop kim Byeong-Joo Lee seok Su Sohn Sunghak Lee Center for High Entropy Alloys Pohang University of Science and TechnologyPohang 37673South Korea Department of Materials Science and Engineering Division of Advanced Materials SciencePohang 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

We present a new class of metastable high-entropy alloys(HEAs),triggering deformation-induced martensitic transformation(DIMT)from face-centered-cubic(FCC)to body-centered-cubic(BCC),i.e.,*** the ab-initio calculation based on 1 st order axial interaction model and combined with the Gibbs free energy calculation,the addition of Si is considered as a critical element which enables to reduce the intrinsic stacking fault energy(ISFE)in Si_xV_((9-x))Cr_(10)Mn_5 Fe_(46)Co_(30)(x=2,4,and 7 at.%)alloy *** ISFE decreases from-30.4 to-35.5 mJ/m^(2)as the Si content increases from 2 to 7 at.%,which well corresponds to the reduced phase stability of FCC against *** BCC-DIMT occurs in all the alloys via intermediate HCP martensite,and the HCP martensite provides nucleation sites of BCC ***,the transformation rate enhances as the Si content increases in an earlier deformation ra ***,the BCC-DIMT is also affected by the phase stability of FCC against BCC,and the stability is the highest at the Si content of 7 at.%.Thus,the 7Si alloy presents the moderate transformation rate in the later deformation *** to the well-controlled transformation rate and consequent strain-ha rdening rate,the 7Si alloy possesses the superior combination of strength and ductility beyond 1 GPa of tensile strength at room *** results suggest that the Si addition can be a favorable candidate in various metastable HEAs for the further property improvement.

关键词： High-entropy alloy(HEA) Deformation-induced martensitic transformation(DIMT) Phase stability Stacking fault energy(SFE)

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Determining node duty cycle using Q-learning and linear regression for WSN

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Frontiers of Computer Science 2021年第1期15卷 17-23页

作者： Han Yao HUANG kyung Tae kim Hee Yong YOUN College of Software Sungkyunkwan UniversitySuwon 440-746Korea

Wireless sensor network(WSN)is effective for monitoring the target environment,which consists of a large number of sensor nodes of limited *** efficient medium access control(MAC)protocol is thus imperative to maximize the energy efficiency and performance of *** most existing MAC protocols are based on the scheduling of sleep and active period of the nodes,and do not consider the relationship between the load condition and *** this paper a novel scheme is proposed to properly determine the duty cycle of the WSN nodes according to the load,which employs the Q-leaming technique and function approximation with linear *** allows low-latency energy-efficient scheduling for a wide range of traffic conditions,and effectively overcomes the limitation of Q-learning with the problem of continuous state-action ***3 simulation reveals that the proposed scheme significantly improves the throughput,latency,and energy efficiency compared to the existing fully active scheme and S-MAC.

关键词： wireless sensor network media access control duty-cycle scheduling Q-leaming linear regression

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PIR-based data integrity verification method in sensor network

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Journal of Central South University 2014年第10期21卷 3883-3888页

作者： Yong-Ki kim Kwangnam Choi Jaesoo kim JungHo seok Korea Institute of Science and Technology Information 245 DaehangnoYuseong Daejeon 305-806 Korea

Since a sensor node handles wireless communication in data transmission and reception and is installed in poor environment, it is easily exposed to certain attacks such as data transformation and sniffing. Therefore, it is necessary to verify data integrity to properly respond to an adversary's ill-intentioned data modification. In sensor network environment, the data integrity verification method verifies the final data only, requesting multiple communications. An energy-efficient private information retrieval(PIR)-based data integrity verification method is proposed. Because the proposed method verifies the integrity of data between parent and child nodes, it is more efficient than the existing method which verifies data integrity after receiving data from the entire network or in a cluster. Since the number of messages for verification is reduced, in addition, energy could be used more efficiently. Lastly, the excellence of the proposed method is verified through performance evaluation.

关键词： data integrity verification private information retrieval sensor network

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Clinical characteristics and progression of liver abscess caused by toxocara

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World Journal of Hepatology 2016年第18期8卷 757-761页

作者： kyung Ho Ha Jung Eun Song Byung seok kim Chang Hyeong Lee Department of Internal Medicine Daegu Medical Center Department of Internal Medicine Division of Gastroenterology and HepatologyDaegu Catholic University

AIM: To evaluate the clinical characteristics and progression of liver abscess caused by ***: We retrospectively reviewed the medical records of patients with serum Ig G antibody to Toxocara canis and liver abscess diagnosed using abdominal computed tomography between February 2010 and February 2015. Among 84 patients exhibiting serum Ig G antibody to Toxocara canis, 34 patients were diagnosed with liver asbscess and treated with albendazole. A follow-up period of 1 year was conducted. RESULTS: Mean patient age was 53(34-79) years, with 26(76.5%) patients being male. Twenty-one(61.7%) patients were moderate or heavy drinkers, 23(67.6%) patients had a history of eating raw meat or liver and 6(17.6%) patients owned pet dogs or cats. Main patient symptoms consisted of right upper quadrant pain, fever, and fatigue; 18(52.9%) patients, however, presented with no symptoms. Lung involvement was detected in 444(11.7%) patients. The eosinophil count increased in 29(85.3%) patients at initial diagnosis, and decreased in most patients after albendazole treatment. The initial serum Ig E level increased in 25(73.5%) patients, but exhibited various response levels after albendazole treatment. Liver abscess formation improved in all ***: The liver abscess was improved with albendazole treatment.

关键词： Toxocariasis Liver abscess Eosinophilia

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Soleus arthrogenic muscle inhibition following acute lateral ankle sprain correlates with symptoms and ankle disability but not with postural control

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Journal of Sport and Health Science 2024年第4期13卷 559-568,F0003页

作者： kyung-Min kim Joo-Sung kim Alan R.Needle Department of Sport Science Sungkyunkwan UniversitySuwon-si 16419Republic of Korea Department of Health and Human Performance Texas State UniversitySan MarcosTX 78666USA Department of Public Health&Exercise Science Appalachian State UniversityBooneNC 28608USA Department of Rehabilitation Science Appalachian State UniversityBooneNC 28608USA

Background:Acute lateral ankle sprains(ALAS)are associated with long-term impairments and instability tied to altered neural *** muscle inhibition(AMI)has been observed in this population;however,relationships with injury-related impairments are unclear,potentially due to the resting,prone position in which AMI is typically *** AMI during bipedal stance may provide a better understanding of this ***:AMI was assessed in 38 young adults(19 ALAS within 72 h of injury:10 males,21.4±2.7 years;19 healthy controls:10 males,21.9±2.2 years;mean±SD)using the Hoffmann reflex(H-reflex)during bipedal *** stimulation was administered to identify the _(max)imal H-reflex(H_(max))and _(max)imal motor response(M_(max))from the soleus,fibularis longus,and tibialis anterior *** primary outcome measure was the H_(max)/M_(max) *** outcomes included acute symptoms(pain and swelling),postural control during bipedal stance,and self-reported ***:No significant group-by-limb interactions were observed for any ***,a significant group main effect was observed in the soleus muscle(F(1,35)=6.82,p=0.013),indicating significantly lower H_(max)/M_(max) ratios following ALAS(0.38±0.20)compared to healthy controls(0.53±0.16).Furthermore,lower H_(max)/M_(max) ratios in the soleus significantly correlated with acute symptoms and self-reported function but not with postural ***:This study supports previous evidence of AMI in patients with ALAS,providing insight into neurophysiologic impacts of musculoskeletal *** results suggest that assessing AMI in a standing position following acute injury may provide valuable insight into how AMI develops and guide potential therapeutic options to curb and offset the formation of joint instability.

关键词： Acute injuries Balance Hoffmann reflex Neural excitability Patient-reported outcomes

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THE EFFECT OF SPATIAL AND TEMPORAL FACTORS ON OCCUPANTS’BLIND USE BEHAVIORS IN MULTIFAMILY RESIDENTIAL BUILDINGS

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Journal of Green Building 2021年第3期16卷 13-35页

作者： Hebatalla Nazmy Suk-kyung kim Teaching Assistant Professor Department of DesignHousingand Merchandising College of Education and Human SciencesOklahoma State University Department of Interior Architecture and Built Environment Yonsei University

Existing studies show that occupants’behavior contribute to fluctuations in energy consumption of residential units within the same building *** blinds are one of the interior design elements that the occupants use to control indoor environmental *** way that occupants adjust their blinds could affect the energy performance of ***,the purpose of this research was to identify spatial and temporal explanatory variables that correlate with occupants’use of the blinds and determine whether those variables relate to building design and surround-ing *** were collected by observing how occupants in apartment buildings located in a multifamily residential complex adjust their *** statistics were used to define the effect of floor level,window orientation,day of observation,the hour of observation,and weather conditions on the blind *** addition,a generalized linear mixed model was used to predict the effect of floor level and window orientation on the occupants’adjustment of *** results revealed that occupants’use of the blinds correlated significantly with spatial factors,such as the apartment buildings’floor level and windows’*** blind use patterns were related to temporal factors,such as the day and hour of observation.

关键词： blind use occupant behavior energy efficiency multifamily residential design observation studies

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Enhancement of mechanical and tribological performance of Ti-6Al-4V alloy by laser surface alloying with Inconel 625 and SiC precursor materials

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Friction 2024年第9期12卷 2089-2107页

作者： Hao-Ran CHENG Ki-Hoon SHIN Hong seok kim Department of Mechanical Engineering Graduate School of Seoul National University of Science and TechnologySeoul 01811Republic of Korea Department of Mechanical and Automotive Engineering Seoul National University of Science and TechnologySeoul 01811Republic of Korea

This study focused on producing metal matrix composite(MMC)coatings on Ti–6Al–4V alloy through laser surface alloying using a novel combination of Inconel 625 and SiC precursor *** ratios of alloying powders were examined to evaluate surface properties such as microhardness,wear resistance,and friction coefficient,along with analyzing the phase composition and microstructure of the *** in situ synthesized MMC coatings exhibited the presence ofα-Ti,NiTi,NiTi_(2),and TiC ***,Ti_(5)Si_(3)andα-Ti/Ti_(5)Si_(3)eutectic structures were observed when the SiC content exceeded 20%.In comparison to the titanium substrate,the MMC coating significantly enhanced microhardness by over threefold and reduced wear by 95%.However,it was crucial to carefully select the appropriate combination of alloying powders to avoid a substantial decrease in friction performance and excessive formation of *** a comparative analysis of experimental results,the optimal precursor material composition was identified as 85%Inconel 625 and 15%*** study demonstrated the effective utilization of Inconel 625 and SiC alloying materials to enhance the surface properties of titanium alloys,thereby expanding their application in challenging environments.

关键词： titanium alloy Inconel 625 SiC ceramic laser surface alloying metal matrix composite(MMC)

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Tc-99m ciprofloxacin imaging in acute cholecystitis

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World Journal of Gastroenterology 2007年第23期13卷 3249-3252页

作者： Yun-Mee Choe Wonsick Choe Keon-Young Lee Seung-Ik Ahn Kwang kim Young Up Cho Sun Keun Choi Yoon-seok Hur Sei-Joong kim Kee-Chun Hong seok-Hwan Shin kyung-Rae kim Ze- Hong Woo Department of Surgery Inha University Hospital Incheon South Korea Department of Nuclear Medicine Gachon Medical School Incheon South Korea

AIM: To evaluate the eff icacy of a new nuclear imaging Infecton (Tc-99m ciprofloxacin) for the diagnosis of acute cholecystitis. METHODS: Sixteen patients thought to have acute cholecystitis were included in this study. The diagnosis of acute cholecystitis was made based on clinical symptoms and ultrasonographic and pathologic f indings. RESULTS: The 16 patients were composed of 12 acute and 4 chronic cholecystitis patients. Twelve patients with acute cholecystitis were image-positive, including one false-positive. Four patients with chronic cholecystitis were image-negative, of whom three were true-negative. This nuclear imaging had a sensitivity of 91.7%, a specificity of 75%, a positive-predictive value of 91.7%, and a negative-predictive value of 75%. CONCLUSION: Tc-99m ciprofloxacin imaging is easy to perform and applicable for the diagnosis of acute cholecystitis.

关键词： Acute cholecystitis Diagnosis Tc-99m ciprofloxacin nuclear imaging

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Polydopamine-derived N-doped carbon-wrapped Na3V2(PO4)3 cathode H with superior rate capability and cycling stability for sodium-ion I batteries

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Nano Research 2019年第2期12卷 397-404页

作者： Hyeongwoo kim Hyojun Lim Hyung-seok kim Ki Jae kim Dongjin Byun Wonchang Choi Center for Energy Storage Research Korea Institute of Science and Technology 5 Hwarang-ro 14-gil Seongbuk-gu Seoul 02792 Republic of Korea Department of Material Science and Engineering Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea Division of Energy & Environment Technology KIST School Korea University of Science and Technology 5 Hwarang-ro 14-gik Seongbuk-gu Seoul 02792 Republic of Korea Department of Energy Engineering Konkuk University 120 Neungdong-ro Gwangin-gu Seoul 05029 Republic of Korea

Na superionic conductor (NASICON)-type Na3V2(PO4)3 (NVP) has been regarded as a promising cathode material for sodium-ion batteries (SIBs). However, NVP suffers from poor cyclability and rate capability because of its intrinsically low electronic conductivity. Herein, we successfully syn thesized N-doped carb on-wrapped Na3V2(PO4)3 (NC@NVP) through the carb on izati on of polydopami ne, which is rich in nitrogen species. The strong adhesion properties of the polydopamine lead to effective and homogeneous wrapping of NVP particles, and it I is further turned into a con ductive N-doped carb on n etwork itself, providi ng facile diffusi on of electr ons and Na+ i ons duri ng battery operation. NC@NVP displays remarkable electrochemical performanee, even under harsh operating conditions, such as a high rate capability (discharge capacity of 70.88, 49.21 mA·h·g^-1 at 50 and 100 C), long-term cycling stability (capacity retention of 94.77% over 1,000 cycles at 20 C), and high-temperature cycling (capacity retention of 92.0% after 500 cycles at 60 ℃).

关键词： polydopamine N-doped carbon Na3V2(PO4)3 cathode sodium-ion batteries

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Optimal Spatial Allocation of Initial Attack Resources for Firefighting in the Republic of Korea Using a Scenario Optimization Model

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Journal of Mountain Science 2014年第2期11卷 323-335页

作者： Yohan LEE Byungdoo LEE kyung Ha kim Korea Rural Economic Institute 117-3 Hoegi-ro Dongdeamun-guSeoul 130-710 South Korea Korea Forest Research Institute Hoegiro 57 Dongdaemun-guSeoul 130-712 South Korea

【Title】 This study explores the optimal spatial allocation of initial attack resources for firefighting in the Republic of Korea. To improve the effectiveness of Korean initial attack resources with a range of policy goals, we create a scenario optimization model that minimizes the expected number of fires not receiving a predefined response. In this study, the predefined response indicates the number of firefighting resources that must arrive at a fire before the fire escapes and becomes a large fire. We use spatially explicit GIS-based information on the ecology, fire behavior, and economic characterizations important in Korea. The data include historical fire events in the Republic of Korea from 1991 to 2007, suppression costs, and spatial information on forest fire extent. Interviews with forest managers inform the range of we address in the decision model. Based on the geographic data, we conduct a sensitivity analysis by varying the parameters systematically. Information on the relative importance of the components of the settings helps us to identify “rules of thumb” for initial attack resource allocations in particular ecological and policy settings.

关键词： Spatial allocation Initial attack Firefighting The Republic of Korea Senario optimization

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