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Dealing with Imbalanced Dataset Leveraging Boundary Samples Discovered by Support Vector Data Description

Computers, Materials & Continua 2021年第3期66卷 2691-2708页

作者： Zhengbo Luo Hamïd Parvïn Harish Garg Sultan noman Qasem kim-Hung Pho Zulkefli Mansor Graduate School of Information Production and SystemsWaseda UniversityTokyoJapan Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Duy Tan UniversityDa Nang550000Vietnam Department of Computer Science Nourabad Mamasani BranchIslamic Azad UniversityMamasaniIran School of Mathematics Thapar Institute of Engineering and TechnologyDeemed UniversityPatialaPunjab147004India Computer Science Department College of Computer and Information SciencesAl Imam Mohammad Ibn Saud Islamic UniversityRiyadhSaudi Arabia Computer Science Department Faculty of Applied ScienceTaiz UniversityTaizYemen Fractional Calculus Optimization and Algebra Research GroupFaculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Fakulti Teknologi dan Sains Maklumat Universiti Kebangsaan MalaysiaSelangorMalaysia

These days,imbalanced datasets,denoted throughout the paper by ID,(a dataset that contains some(usually two)classes where one contains considerably smaller number of samples than the other(s))emerge in many real world problems(like health care systems or disease diagnosis systems,anomaly detection,fraud detection,stream based malware detection systems,and so on)and these datasets cause some problems(like under-training of minority class(es)and over-training of majority class(es),bias towards majority class(es),and so on)in classification process and ***,these datasets take the focus of many researchers in any science and there are several solutions for dealing with this *** main aim of this study for dealing with IDs is to resample the borderline samples discovered by Support Vector Data Description(SVDD).There are naturally two kinds of resampling:Under-sampling(U-S)and oversampling(O-S).The O-S may cause the occurrence of over-fitting(the occurrence of over-fitting is its main drawback).The U-S can cause the occurrence of significant information loss(the occurrence of significant information loss is its main drawback).In this study,to avoid the drawbacks of the sampling techniques,we focus on the samples that may be *** data points that can be misclassified are considered to be the borderline data points which are on border(s)between the majority class(es)and minority class(es).First by SVDD,we find the borderline examples;then,the data resampling is applied over *** the next step,the base classifier is trained on the newly created ***,we compare the result of our method in terms of Area Under Curve(AUC)and F-measure and G-mean with the other state-of-the-art *** show that our method has betterresults than the other state-of-the-art methods on our experimental study.

关键词： Imbalanced learning classification borderline examples

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Optimal Reordering Trace Files for Improving Software Testing Suitcase

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Computers, Materials & Continua 2021年第4期67卷 1225-1239页

作者： Yingfu Cai Sultan noman Qasem Harish Garg Hamïd Parvïn kim-Hung Pho Zulkefli Mansor School of Measurement and Communication Harbin University of Science&TechnologyHarbinChina Computer Science Department College of Computer and Information SciencesAl Imam Mohammad Ibn Saud Islamic University(IMSIU)RiyadhSaudi Arabia Department of Computer Science Faculty of Applied ScienceTaiz UniversityTaizYemen School of Mathematics Thapar Institute of Engineering and TechnologyDeemed UniversityPatiala147004India Institute of Research and Development Duy Tan UniversityDa Nang550000Vietnam Faculty of Information Technology Duy Tan UniversityDa Nang550000Vietnam Department of Computer Science Nourabad Mamasani BranchIslamic Azad UniversityMamasaniIran Fractional Calculus Optimization and Algebra Research GroupFaculty of Mathematics and StatisticsTon Duc Thang UniversityHo Chi Minh CityVietnam Fakulti Teknologi dan Sains Maklumat Universiti Kebangsan MalaysiaUKM BangiSelangor43600Malaysia

An invariant can be described as an essential relationship between program *** invariants are very useful in software checking and *** tools that are used to detect invariants are invariant *** are two types of invariant detectors:dynamic invariant detectors and static invariant *** software is an available computer program that implements a special case of a dynamic invariant detection *** proposes a dynamic invariant detection algorithm based on several runs of the tested program;then,it gathers the values of its variables,and finally,it detects relationships between the variables based on a simple statistical *** method has some *** of its biggest drawbacks is its overwhelming time *** is observed that the runtime for the Daikon invariant detection tool is dependent on the ordering of traces in the trace file.A mechanism is proposed in order to reduce differences in adjacent trace *** is done by applying some special techniques of mutation/crossover in genetic algorithm(GA).An experiment is run to assess the benefits of this *** findings reveal that the runtime of the proposed dynamic invariant detection algorithm is superior to the main approach with respect to these improvements.

关键词： Dynamic invariant detection software testing genetic algorithm

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Sandwich-type ordered mesoporous carbon/graphene nanocomposites derived from ionic liquid

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nano Research 2016年第9期9卷 2696-2706页

作者： Ho Seok kim Young Hwan kim kwang Chul Roh kwang-Bum kim Lab of Energy Storage Materials Department of Material Science & EngineeringYonsei UniversitySeou1120749Republic of Korea Energy & Environmental Division Korea Institute of Ceramic Engineering & TechnologyJinju 52851Republic of Korea

Sandwich-type ordered mesoporous carbon/graphene nanocomposites were successfully synthesized using 2D ordered mesoporous silica/graphene nanocomposites as the hard template and an ionic liquid as a n-rich carbon source. We used an ionic liquid of 1-(3-cyanopropyl)-3-methylimidazolium dicyanamide containing nitrile groups (–Cn) in the cation and anion as a carbon precursor for the preparation of the nanocomposites. nitriles do not decompose under thermal treatment in an inert gas atmosphere, but leave significant amounts of n-rich carbon materials. The nanocomposites had a large surface area (1,316 m2·g–1), an average pore diameter of 5.9 nm, and high electrical conductivity. The nanocomposite electrode showed a high specific capacitance of 190 F·g–1at 0.5 A·g–1in 1 M TEABF4/An electrolyte and a good rate capability between 0 and 2.7 V for supercapacitor (or ultracapacitor) applications. [Figure not available: see fulltext.] © 2016, Tsinghua University Press and Springer-Verlag Berlin Heidelberg.

关键词： ionic liquid-derived carbon ordered mesoporous carbon/graphene nanocomposite 2D graphene nanocomposite supercapacitor

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A novel PT Design Concept of High Voltage RC-GCTs

A Novel PT Design Concept of High Voltage RC-GCTs

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第4届国际电力电子及运动控制国际会议

作者： S.C.kim E.D.kim H.W.kim k.S.Seo n.k.kim Power Semiconductor Research Group korea Electrotechnology Research Institute Changwon Republic of Korea Power Semiconductor Research Group korea Electrotechnology Research Institute Changwon Republic of Korea Power Semiconductor Research Group korea Electrotechnology Research Institute Changwon Republic of Korea Power Semiconductor Research Group korea Electrotechnology Research Institute Changwon Republic of Korea Power Semiconductor Research Group korea Electrotechnology Research Institute Changwon Republic of Korea

＜正＞ A design rule for 5,500V RC-GCTs （Reserve-Conducting Gate-Commutated Thyristors） with a novel punch-through （PT） concept is described. PT and nPT （non punch-through） designs have been compared in detail. The simulation work indicates that PT-GCT design can achieve a forward breakdown voltage of 6,400V with a minimum n-base layer width of 405μm. In addition, it exhibits the fast turn-on and turn-off performance via snubberless circuit.

关键词： Gate -Commutated Thyristor (GCT) turn-off

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采用动态磁敏感对比增强技术测量氧合和微血管通过时间异质性来预测胶质母细胞瘤治疗后的假性进展

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国际医学放射学杂志 2024年第4期 497-497页

作者： J.E.Park H.S.kim n.Y.kim R.Borra k.Mouridsen M.B.Hansen 胡佳圆

摘要目的评估MR动态磁敏感对比（DSC）灌注加权成像（PWI）的肿瘤微血管和氧代谢信息对脑血容量（CBV）鉴别胶质母细胞瘤治疗后的假性进展和真性进展（TP）的附加价

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n-doped carbon-embedded Tin nanowires as a multifunctional separator for Li–S batteries with enhanced rate capability and cycle stability

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Journal of Energy Chemistry 2021年第6期30卷 10-18,I0001页

作者： Yoongon kim Yuseong noh Jaejin Bae Hyunwoo Ahn Minho kim Won Bae kim Department of Chemical Engineering Pohang University of Science and Technology(POSTECH)77 Cheongam-roNam-guPohang 37673South Korea

Lithium-sulfur(Li-S)batteries have attracted considerable attention as next-generation energy storage devices owing to their high theoretical specific capacity and ***,the commercialization of Li-S batteries is hindered by critical issues,including the migration of the dissolved lithium polysulfides(LiPSs)from the sulfur electrode to the lithium metal anode,resulting in poor cycling ***,we report a multifunctional interlayer configured with an n-doped carbon framework and titanium nitride nanowires on a polypropylene separator(nC/Tin nWs@PP)to suppress the polysulfide shuttling ***/Tin nWs@PP can be obtained by electrospinning and the subsequent scalable solution-based vacuum *** one-dimensional structure of the Tin nWs can shorten the Li-ion diffusion distance with large electrode/electrolyte ***,the n-doped carbon framework in the nWs enables facile electron transportation and allows the suppression of the shuttle effect to improve the electrochemical reaction *** Li-S battery with a nC/Tin nWs@PP separator exhibited enhanced cycling stability and rate capability,indicating that this could be a new research direction for Li-S batteries.

关键词： Li-S battery Shuttle effect Interlayer Separator Tin n-doped carbon 1D nanowire

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Characterisation of undigested components throughout the gastrointestinal tract of broiler chickens fed either a wheat-or maizebased diet

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Animal nutrition 2022年第1期8卷 153-159页

作者： Eunjoo kim natalie k.Morgan Amy F.Moss Lily Li Peter Ader Mingan Choct School of Environmental and Rural Science University of New EnglandArmidaleNSW2351Australia BASF South East Asia038987Singapore BASF SE 68623LampertheimGermany

This study was to characterise the undigested nutrients present along the gastrointestinal tract of birds offered common wheat-or maize-based diets,with the goal of optimising utilisation of enzymes to enhance digestive ***-and maize-based diets were offered to 240 mixed-sex broilers(10 birds/pen;n=12)from 1 to 35 d *** of dry matter,starch,crude protein and nonstarch polysaccharides(nSP)were measured in the crop,gizzard,duodenum,jejunum,ileum,caeca and excreta at d 12 and 35 *** of nutrient levels in the excreta presented that more than 30%of nutrients provided in the feed was wasted,irrespective of wheat or maize diet *** average,92 g/kg crude protein,92 g/kg insoluble nSP and 14 g/kg oligosaccharides were not utilised by birds at d 12 *** quantity of water-insoluble nSP in the small intestine at d 12 was lower in birds offered the wheat-based diet compared to those fed the maize-based diet(Png true for water-soluble nSP(Pn average,84 g/kg crude protein,79 g/kg insoluble nSP and 9 g/kg oligosaccharides remained in the excreta at 35 d of *** this time period,accumulation of feed in the gizzard was noted for birds offered both diets,but was more pronounced in those offered the maize-based diet(Pnstrated improved utilisation of oligosaccharides compared to those fed the wheat-based diet at both d 12 and 35(P=0.087 and P=0.047,respectively).Protein utilisation in the jejunum and ileum was greater in birds offered the wheat-based diet compared to those fed the maize-based diet(P=0.004 and Pndard growth performance of birds,the degree and flow of nutrient disappearance along the gastrointestinal tract was influenced by cereal type and bird age.

关键词： Broiler chicken nutrient digestibility Undigested dietary component

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Phase-pure na3V2(PO4)2F3 embedded in carbon matrix through a facile polyol synthesis as a potential cathode for high performance sodium-ion batteries

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nano Research 2019年第4期12卷 911-917页

作者： Sohyun Park Jinju Song Seyeon kim Balaji Sambandam Vinod Mathew Sungjin kim Jeonggeun Jo Seokhun kim Jaekook kim Department of Materials Science and Engineering Chonnam National University 300 Ybngbong-dong Buk-gu Gwangju 500-757 Republic of Korea Gwangju Bio/Energy R&D Center Korea Institute of Energy Research (KIER) 270-25 Samso-ro Buk-gu Gwangju 61003 Republic of Korea

In this study,a pseudo-layered na super-ionic conductor of na3V2(PO4)2F3 (nVPF)/C cathode for sodium-ion batteries is prepared successfully using a facile polyol refluxing process without any impurity *** X-ray diffraction and Rietveld refinement results confirm that nVPF possesses tetragonal nASICOn-type lattice with a space group of P42/*** this preparative method,polyol is utilized as a solvent as well as a carbon *** presence of nanosized nVPF particles in the carbon network is confirmed by field-emission scanning electron microscopy (FE-SEM) and high-resolution transmission electron microscopy (HR-TEM).The existence of carbon is analyzed by Raman scattering and elemental *** applied as a na-storage material in a potential window of 2.0-4.3 V,the electrode exhibits two flat voltage plateaus at 3.7 and 4.2 V with an electrochemically active V^3+/V^4+ redox *** addition,na3V2(PO4)2F3/C composite achieved a retention capacity of ~ 88% even after 1,500 cycles at 15 ***,at high current densities of 30 and 50 C,na3V2(PO4)2F3/C cathode retains the specific discharge capacities of 108.4 and 105.9 mAh·g-1,respectively,revealing the structural stability of the material prepared through a facile polyol refluxing method.

关键词： fluorophosphate na3V2(PO4)2F3 polyol process sodium ion batteries long life stability

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Internal Flow Simulation of High-Performance Solid Rockets using a k-ω Turbulence Model

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Journal of Thermal Science 2005年第2期14卷 114-119页

作者： V.R.SAnAL kUMAR H.D.kim B.n.RAGHUnAnDAn T.SETOGUCHI S.RAGHUnATHAn Andong national University Andong 760-749 KoreaAndong National University Andong 760-749KoreaIndian Institute of Science Bangalore-560 012IndiaSaga University Honjo-machiSaga 840-8502JapanThe Oueen's University of Belfast Northern IrelandUK

For technological reasons many high-performance solid rocket motors are made from segmented propellant grains with non-uniform port geometry. In this paper parametric studies have been carried out to examine the geometric dependence of transient flow features in solid rockets with non-uniform ports. numerical computations have been carried out in an inert simulator of solid propellant rocket motor with the aid of a standard k-ω turbulence model. It was seen that the damping of the temperature fluctuation is faster in solid rocket with convergent port than with divergent port geometry. We inferred that the damping of the flow fluctuations using the port geometry is a meaningful objective for the suppression and control of the instability and/or pressure/thrust oscillations during the starting transient of solid rockets.

关键词： solid rockets pressure spike instability thrust oscillation turbulent separation.

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Silicon nanowire CMOS nOR logic gates featuring onevolt operation on bendable substrates

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nano Research 2018年第5期11卷 2625-2631页

作者： Jeongje Moon Yoonjoong kim Doohyeok Lim Sangsig kim Department of Electrical Engineering Korea University 145 Anam-ro Seongbuk-gu Seoul 02841 Republic of Korea LED PkG Development Group Samsung Electronics Co. Ltd. 1 Samsung-ro Yongin-si Gyeonggi-do 17113 Republic of Korea

In this study, we propose complementary metal-oxide-semiconductor （CMOS） nOR logic gates consisting of silicon nanowire （nW） arrays on bendable substrates. A circuit consisting of two p-channel nW field-effect transistors （nWFETs） in series and two n-channel nWFETs in parallel is constructed to operate a two- input CMOS nOR logic gate. The nOR logic gates operate at a low supply voltage of 1 V with a rail-to-rail logic swing and a high voltage gain of approximately -3.0. The exact nOR logic functionality is achieved owing to the superior electrical characteristics of the well-aligned p- and n-nWFETs, which are obtained using conventional Si-based CMOS technology. Moreover, the nOR logic gates exhibit stable characteristics and have good mechanical properties. The proposed bendable nW CMOS nOR logic gates are promising building blocks for future bendable integrated electronics.

关键词： field-effect transistor silicon nanowire nOR logic gate bendable substrate

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