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EVALUATION OF DUCTILE FRACTURE CRITERIA IN A GENERAL THREE-DIMENSIONAL STRESS STATE CONSIDERING THE STRESS TRIAXIALITY AND THE LODE PARAMETER

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Acta Mechanica Solida Sinica 2013年第6期26卷 642-658页

作者： Yanshan Lou Hoon huh School of Mechanical Aerospace and Systems EngineeringKAIST335GwahangnoDaeduk Science TownDaejeon305-701South Korea

This paper is concerned with evaluation of various ductile fracture criteria in a general three-dimensional stress state of stress triaxiality, the Lode parameter and the equiva- lent plastic strain to fracture. Evaluation is carried out by comparing fracture loci constructed by fracture criteria to experimental results of A12024-T351. Comparison demonstrates that the Modified Mohr-Coulomb criterion and a newly proposed criterion provide sufficient predictabil- ity of fracture strain. Moreover, evaluation is emphasized on the predicted cut-off value for stress triaxiality. The evaluation demonstrates that the Cockcroft-Latham, Brozzo, Oh, Ko-huh and the new criteria coupled a reasonable cut-off value for ductile materials.

关键词： fracture alloys ductile material fracture locus metal forming

Universal bound on sampling bosons in linear optics and its computational implications

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National Science Review 2019年第4期6卷 719-729页

作者： Man-Hong Yung Xun Gao Joonsuk huh Shenzhen Institute for Quantum Science and Engineering and Department of Physics Southern University of Science and Technology Shenzhen Key Laboratory of Quantum Science and Engineering Southern University of Science and Technology Central Research Institute Huawei Technologies Center for Quantum Information Institute for Interdisciplinary Information SciencesTsinghua University Department of Chemistry Sungkyunkwan University

In linear optics, photons are scattered in a network through passive optical elements including beam splitters and phase shifters, leading to many intriguing applications in physics, such as Mach–Zehnder interferometry, the Hong–Ou–Mandel effect, and tests of fundamental quantum mechanics. Here we present the fundamental limit in the transition amplitudes of bosons, applicable to all physical linear optical networks. Apart from boson sampling, this transition bound results in many other interesting applications,including behaviors of Bose–Einstein condensates(BEC) in optical networks, counterparts of Hong–Ou–Mandel effects for multiple photons, and approximating permanents of matrices. In addition,this general bound implies the existence of a polynomial-time randomized algorithm for estimating the transition amplitudes of bosons, which represents a solution to an open problem raised by Aaronson and Hance(Quantum Inf Comput 2012; 14: 541–59). Consequently, this bound implies that computational decision problems encoded in linear optics, prepared and detected in the Fock basis, can be solved efficiently by classical computers within additive errors. Furthermore, our result also leads to a classical sampling algorithm that can be applied to calculate the many-body wave functions and the S-matrix of bosonic particles.

关键词： boson sampling quantum optics quantum supremacy linear optics computational complexity

Management of Schemes and Threat Prevention in ICS Partner Companies Security

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Computers, Materials & Continua 2021年第12期69卷 3659-3684页

作者： Sangdo Lee Jun-Ho huh Cyber Security Center Korea Midland Power Co.Ltd.BoryeongKorea Department of Data Informatics (National)Korea Maritime and Ocean UniversityBusanKorea

An analysis of the recent major security incidents related to industrial control systems,revealed that most had been caused by company ***,enterprise security management systems have been developed to focus on companies’***,several hacking incidents,involving major companies and public/financial institutions,were actually attempted by the cooperative firms or the outsourced manpower undertaking maintenance ***,institutions that operate industrial control systems(ICSs)associated with critical national infrastructures,such as traffic or energy,have contracted several cooperative ***,ICT’s importance is gradually increasing,due to outsourcing,and is the most vulnerable factor in *** paper proposes a virtualized security management scheme for the resident cooperative firms in the industrial control *** such companies often cannot afford adequate investment in security,the scheme is to let an ICS company provide the virtualized *** of its merits is the convenience of controlling a VDI server at the *** cooperative firms were classified,based on their respective security levels,and statistics were collected throughout a four-year period for the *** paper analyzes the policies and virtualization systems that have been applied to the security of the partner companies,which engaged in ICS security.A suitable model for ICS security was then proposed by analyzing their effects on the system efficiencies,based on the comparisons of the security inspection results obtained before and after *** proposed system is expected to contribute to industrial safety.

关键词： Nuclear power plant nuclear power plant security virtual machine SCADA ICS ISO27001 VDI based security software engineering

Globally generated vector bundles on a smooth quadric surface

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Science China Mathematics 2015年第3期58卷 633-652页

作者： BALLICO Edoardo huh Sukmoon MALASPINA Francesco Department of Mathematics Università di Trento Department of Mathematics Sungkyunkwan University Department of Mathematical Science Politecnico di Torino

We give the classification of globally generated vector bundles of rank 2 on a smooth quadric surface with c1(2,2)in terms of the indices of the bundles,and extend the result to arbitrary higher rank *** also investigate their indecomposability and give the sufficient and necessary condition on numeric data of vector bundles for indecomposability.

关键词： higher rank vector bundles globally generated smooth quadric surface

Characteristics and Application of Conducting Polymer Sensor

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稀有金属材料与工程 2006年第A03期35卷 479-482页

作者： Joon-Boo Yu Jeung-Soo huh Department of Material Science and Metallurgy Kyungpook National UniversityDaegu 702-701Korea

Conducting polymers sensors have been very interesting that it can detect wide variety of functionalities,however these materials have to solve humidity contaminant,poor reversibility and *** improve this problems,we investigated pretreatment such as soaking in methanol and thermal treatment in N_*** process improved stability, reversibility and response time and recovery *** overcome humidity contaminant coated hydrophobic polymer was reduced above 50% at RH10%.For sensor array structure was fabricated for enhancing selectivity of gas *** polymer sensor array had several application in environmental and medical science the method of principal component analysis.

关键词： conducting polymer VOCs gas sensor

Superior anti-icing strategy by combined sustainable liquid repellence and electro/photo-responsive thermogenesis of oil/MWNT composite

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Journal of Materials Science & Technology 2020年第14期47卷 106-116页

作者： Aeree Kim Seonghyeon Kim Myoung huh Hyungmo Kim Chan Lee Department of Mechanical Engineering Pohang University of Science and Technology(POSTECH)Pohang37673Republic of Korea Korea Atomic Energy Research Institute(KAERI) Daejeon34057Republic of Korea

This paper introduces an effective anti-icing strategy that uses passive anti-icing property and active de-icing functions *** dual capabilities can alleviate the icing problem more effectively than either a passive or active function *** developed material is a slippery liquid-repellent elastic conductor(SLEC);it is an organogel that is composed of multi-walled carbon nanotubes,oil,and *** SLEC maintains passive water-droplet sliding ability even on wet surfaces that frequently occur in cold conditions(e.g.,during condensation and defrosting),suppresses ice nucleation,and shows ice adhesion strength as low as^20 *** SLEC releases heat when it is subject to electrical or photonic stimulation,and can therefore it can prevent ice formation and melt ice that has already formed on a *** material has sustainable liquid repellence by syneresis and replenishment;this ability ensures long-lasting anti-icing property,and results in exceptional *** durability is stable against mechanical *** superior dual anti-icing capabilities together with the sustainable and stable liquid repellence should generate synergistic effects,and yield a powerful anti-icing tool that can broaden the range of icing applications.

关键词： Anti-icing De-icing Icephobic Soft conductor Self-healing Nanocomposite Liquid repellence

Reactive Core-Shell Bottlebrush Copolymer as Highly Effective Additive for Epoxy Toughening

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Chinese Journal of Polymer Science 2021年第12期39卷 1626-1633页

作者： Junsoo Moon Yoon huh Seonghwan Kim Youngson Choe Joona Bang Department of Chemical and Biological Engineering Korea UniversitySeoul 02841Republic of Korea Department of Chemical Engineering Pusan National UniversityPusan 46241Republic of Korea

Herein,we designed a core-shell structured bottlebrush copolymer(BBP),which is composed of rubbery poly(butyl acrylate)(PBA)core and an epoxy miscible/reactive poly(glycidyl methacrylate)(PGMA)shell,as an epoxy tougheni ng age *** PGMA shell allows BBP to be uniformly dispersed within the epoxy matrix and to react with the epoxy groups,while the rubbery PBA block simultaneously induced nanocavitation effect,leading to improvement of mechanical properties of the epoxy *** mechanical properties were measured by the adhesion performance test,and the tensile and fracture test using universal testing *** BBP additives were added to the epoxy resin,a sign ifica nt improveme nt in the adhesion stren gth(2-fold increase)and fracture toughness(2-fold in crease in Kic and 5-fold in crease in Gic)compared to the neat epoxy was *** contrast,linear additives exhibited a decrease in adhesion strength and no improvement of fracture toughness over the neat *** a difference in mechanical performance was investigated by comparing the morphologies and fracture surfaces of the epoxy resins containing linear and BBP additives,confirming that the nanocavitation effect and void formation play a key role in strengthening the BBP-modified epoxy resins.

关键词： Bottlebrush polymer ROMP Additive Adhesion Epoxy toughening

Developing an index of sustainable development goals for local governments:the case of Gyeonggi province in korea

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Ecosystem Health and Sustainability 2021年第1期7卷 372-385页

作者： Jaekyung Koh Taewook huh Minji Ye Department of Ecology&Environment Gyeonggi Research InstituteSuwon CityKorea Department of Public Administration Gyeongsang National UniversityJinju CityKorea

This study aims to develop and evaluate the indicators of Sustainable Development Goals(hereafter SDGs)for local governments in Gyeonggi Province,South Korea from the perspective of the glocal mainstreaming of SDGs and *** surveys and focus group meetings,35 SDGs indicators that are to be implemented by both the Gyeonggi Provincial government and 31 separate local governments were selected and an overall index was calculated by standardizing 27 *** the comparative analysis of the fuzzy-set,this paper revealed the four ideal types along with the arrangement of two variables,the socio-economic SDGs index(S)and the environmental SDGs index(E),which are derived from 31 local *** short,some examples of this arrangement are the Type 1(S^(*)E:“sustainable local gov.”)including Hanam City(fuzzy score,0.729);Type 2(S^(*)e:“imbalanced local gov.(I)”)including Hwaseong City(0.862);Type 3(s^(*)E:“imbalanced local gov.(II)”)including Gapyeong County(0.922);and Type 4(s^(*)e:“unsustainable local gov.”)including Pyeongtaek City(0.650).As a result,this paper suggests policy priority should be placed on the local governments of Type 4 where all three dimensions of sustainable development pose ***,it is important for Type 2 and Type 3 to enhance policy coherence for sustainability.

关键词： Sustainable development goals localization local governments SDG index Fuzzy set analysis

Geochemistry and Origin of Layers in Single Manganese Nodule from the Philippine Sea and Manganese Nodules from Offshore Minami-Torishima, Western Pacific

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Acta Geologica Sinica(English Edition) 2014年第6期88卷 1835-1845页

作者： YAO Yungchang CHEN Juchin huh Chihan LEE Yungtan Institute of Oceanography National Taiwan University Division of Preparatory Programs for Overseas Chinese Students National Taiwan Normal University Institute of Earth Sciences Academia Sinica Department of Tourism Aletheia University

Layers from one manganese nodule dredged from the Philippine Sea（16°56＇N, 129°48＇E; water depth, 5700 m） and 45 bulk nodules from offshore Minami-Torishima Island, Japan（23°3＇N, 153°22＇E; water depth, 1200 m） were analyzed chemically and their origin is discussed based on geochemical constraints. In general, Cu, Ni, Zn and Mo tend to increase with increasing Mn content, while Co, Pb, Ba, V, Sc, Th, and the rare earth elements（REEs） show less variation with increasing Mn content. Nodule 42 H from the Philippine Sea has an average Mn/Fe ratio close to 1 and shows a positive Ce anomaly, suggesting a predominant hydrogenous origin. Profiles of 230Th230 ex and Thex/232 Th ratios in the outer ~0.3 mm of nodule 42 H indicate a steady growth rate of ~1.7 mm/Myr. Nodule E30 from offshore Minami-Torishima is characterized by lower Mn, Fe, Mn/Fe（0.53） and Mo/V（0.2） ratios but higher P and Cu/Ni（0.31） ratio relative to other nodules from that area. The Ce content of E30 is unusually low（82 ppm） when compared with other nodules from the area and it is the only nodule analyzed with a negative Ce anomaly（-0.64）. Based on the geochemical data we suggest that most nodules from offshore Minami-Torishima are primarily of hydrogenous origin except E30, which is dominated by hydrothermal input, and E45, which has about a 35% hydrothermal contribution.

关键词： manganese nodule geochemistry origin the Philippine Sea Minami-Torishima