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Cybersecurity 2024年第2期7卷 44-67页

作者： Qi Zhang Zhixiang Liang Shujuan Ji Benyong Xing Dickson K.w.Chiu Shandong Provincial Key Laboratory of w.sdom Mine Information Technology Shandong University of Science and TechnologyQingdao 266590ShandongChina Zhejang University-University of linois at Urbana-Champaign Institute Haining 314499ZhejiangChina School of Civil Engineering Beijing Jiaotong UniversityBeijing 100044China Faculty of Education The University of Hong KongPok Fu LamHong KongChina

It is not uncommon for malicious sellers to collude w.th fake review.rs(also called spammers)to w.ite fake review. for multiple products to either demote competitors or promote their products'reputations,forming a gray industry *** detect spammer groups in a heterogeneous netw.rk w.th rich semantic information from both buyers and sellers,researchers have conducted extensive research using Frequent Item Mining-based and graph-based ***,these methods cannot detect spammer groups w.th cross-product attacks and do not jointly consider structural and attribute features,and structure-attribute correlation,resulting in poorer detection ***-fore,w. propose a collaborative training-based spammer group detection algorithm by constructing a heterogene-ous induced sub-netw.rk based on the target product set to detect cross-product attack spammer *** jointly consider all available features,w. use the collaborative training method to learn the feature representations of *** addition,w. use the DBSCAN clustering method to generate candidate groups,exclude innocent ones,and rank them to obtain spammer *** experimental results on real-w.rld datasets indicate that the overall detection performance of the proposed method is better than that of the baseline methods.

关键词： Spammer group Heterogeneous netw.rk Collaborative training DBSCAN

Model Predictive Current Control for Low.Cost Shunt Active Pow.r Filter

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CSEE Journal of Pow.r and Energy Systems 2024年第4期10卷 1589-1598页

作者： Ali A.Abdel-Aziz Mohamed A.Elgenedy Barry w.w.lliams the Electronic and Electrical Engineering Department Strathclyde UniversityGlasgowG11XQUK School of Computing Engineering and the Built Environment(SCEBE)Glasgow Caledonian UniversityGlasgowG40BAUK

Performance of a three-phase shunt active pow.r filter(SAPF)relies on the capability of the controller to track the reference ***,designing an accurate current controller is crucial to guarantee satisfactory SAPF *** paper presents a model predictive current controller(MPCC)for a low.cost,four-sw.tch,shunt active pow.r filter for pow.r quality improvement.A four-sw.tch,B4,converter topology is adopted as an SAPF,hence offering a simple,robust,and low.cost *** addition,to further reduce overall cost,only tw. interfacing filter inductors,instead of three,are used to eliminate sw.tching current *** proposed SAPF model MPCC is detailed for implementation,w.ere simulation and experimental results validate effectiveness of the proposed control algorithm show.ng a 20%improvement in total harmonic distortion compared w.th a conventional hysteresis band current controller.

关键词： Four-sw.tch converter harmonic distortion model predictive current control pow.r quality shunt active pow.r filter

The CCD instrument background of the SMILE SXI

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Earth and Planetary Physics 2024年第1期8卷 15-24页

作者： M.w.J.Hubbard O.Hetherington D.J.Hall T.w.Buggey S.Parsons T.Arnold A.Holland C.Pagani S.Sembay Centre for Electronic Imaging The Open UniversityMilton KeynesMK76AAUK X-ray and Observational Astronomy Group Department of Physics&AstronomyUniversity of LeicesterLE17RHUK

The ESA and CAS SMILE mission orbit is highly elliptical and w.ll pass through multiple radiation *** Soft X-ray Imager(SXI)instrument aboard has a radiation shutter door designed to close w.en the surrounding radiation flux is *** shutter door w.ll close w.en passing below.an altitude threshold to protect against trapped particles in the Earth’s Van Allen ***,tw. radiation environments can be approximated based on the shutter door position:open and *** instrument background for the CCDs(Charge-Coupled Devices)that form the focal plane array of the SXI w.re evaluated for the tw. *** to the correlation of the space environment w.th the solar cycle,the solar minima and maxima,the background w.s also evaluated at these tw. *** results demonstrated that the highest instrument background w.ll occur during solar minima due to the main contributing source being Galactic Cosmic Rays(GCRs).It w.s also found that the open background w.s highest for solar minima and that the closed background w.s highest during solar *** is due to the radiation shutter door acting as a scattering centre and the changes in the energy flux distribution of the GCRs betw.en the tw. solar extremes.

关键词： instrument background X-ray astronomy space radiation

Low.rank matrix recovery w.th total generalized variation for defending adversarial examples

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Frontiers of Information Technology & Electronic Engineering 2024年第3期25卷 432-445页

作者： w.n LI Hengyou w.NG Lianzhi HUO Qiang HE Linlin CHEN Zhiquan HE w.ng w.Y.Ng School of Science Beijing University of Civil Engineering and ArchitectureBeijing 100044China School of Computer Science and Engineering South China University of TechnologyGuangzhou 510006China Aerospace Information Research Institute Chinese Academy of SciencesBeijing 100094China Guangdong Key Laboratory of Intelligent Information Processing Shenzhen 518060China Institute of Big Data Modeling and Technology Beijing University of Civil Engineering and ArchitectureBeijing 100044China

Low.rank matrix decomposition w.th first-order total variation(TV)regularization exhibits excellent performance in exploration of image *** advantage of its excellent performance in image denoising,w. apply it to improve the robustness of deep neural ***,although TV regularization can improve the robustness of the model,it reduces the accuracy of normal samples due to its *** our w.rk,w. develop a new.low.rank matrix recovery model,called LRTGV,w.ich incorporates total generalized variation(TGV)regularization into the rew.ighted low.rank matrix recovery *** the proposed model,TGV is used to better reconstruct texture information w.thout *** rew.ighted nuclear norm and Li-norm can enhance the global structure ***,the proposed LRTGV can destroy the structure of adversarial noise w.ile re-enhancing the global structure and local texture of the *** solve the challenging optimal model issue,w. propose an algorithm based on the alternating direction method of *** results show.that the proposed algorithm has a certain defense capability against black-box attacks,and outperforms state-of-the-art low.rank matrix recovery methods in image restoration.

关键词： Total generalized variation Low.rank matrix Alternating direction method of multipliers Adversarial example

Tumor necrosis factor-alpha, transforming grow.h factor-beta, degree of low.r urinary tract symptoms as predictors of erectile dysfunction in benign prostatic hyperplasia patients

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Asian Journal of Urology 2024年第2期11卷 280-285页

作者： Gede w.K.Duarsa Yeremia G.Kusumah Ronald Sugianto Pande M.w.Tirtayasa Tjokorda G.B.Mahadew. Department of Urology Faculty of MedicineUniversitas UdayanaProf.Dr.I.G.N.G Ngoerah General HospitalBaliIndonesia Department of General Surgery Faculty of MedicineUniversitas UdayanaProf.Dr.I.G.N.G Ngoerah General HospitalBaliIndonesia Medical Doctor Study Program Faculty of MedicineUniversitas UdayanaBaliIndonesia Department of Urology Faculty of MedicineUniversitas UdayanaUniversitas Udayana Teaching HospitalBaliIndonesia Department of Neurosurgery Faculty of MedicineUniversitas UdayanaProf.Dr.I.G.N.G Ngoerah General HospitalBaliIndonesia

Objective: Erectile dysfunction (ED) is a condition of insufficient penile erection, consistently or recurrently, for sexual activity. Tumor necrosis factor-alpha (TNF-α) induces transforming grow.h factor-beta (TGF-β), w.ich causes the transition of epithelial cells into mesenchymal cells that affect ED. This study aimed to evaluate the roles of TNF-α, TGF-β, degree of low.r urinary tract symptoms, and prostatic volume for the presence of ED in benign prostatic hyperplasia (BPH) ***: Our study performed an analytic observational retrospective cohort study using secondary data from four hospitals in Bali, Indonesia, including medical records and other administrative data. The sample w.s BPH patients w.th several history ***: Our sample w.s 83 respondents, ranging from 50 years to 80 years, 61 respondents w.th ED and 22 w.th non-ED. The International Prostate Symptom Score show.d a significant result, w.ich indicates that ED is more common in patients w.th higher International Prostate Symptom Score (p=0.002). Moreover, the TNF-α of ≥43.9 pg/mg and TGF-β of ≥175.8 pg/mL w.re significantly associated w.th the presence of ED in BPH patients (pw.th ED (p=0.947).Conclusion: TNF-α, TGF-β, and low.r urinary tract symptoms severity can predict the occurrence of ED in BPH, w.ile prostatic volume w.s not significant.

关键词： Prostate enlargement Biomarker Erectiledysfunction Riskfactor

Coupled Cu doping and Z-scheme heterojunction for synergistically enhanced tetracycline photodegradation

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Nano Research 2024年第7期17卷 5937-5948页

作者： Huidong Shen Chunming Yang Song Hong Leiduan Hao Liang Xu Alex w.Robertson Zhenyu Sun Country State Key Laboratory of Organic-Inorganic Composites College of Chemical EngineeringBeijing University of Chemical TechnologyBeijing 100029China Shaanxi Key Laboratory of Chemical Reaction Engineering College of Chemistry and Chemical EngineeringYan’an UniversityYan’an 716000China Department of Physics University of WarwickCoventry CV 47ALUK

Semiconductor-based photocatalysis by utilizing solar energy for sustainable organic pollutant elimination has been a promising tactic to alleviate environmental ***,the development of robust and efficient photocatalysts to degrade organic pollutants still faces major challenges because of insufficient charge *** w. design and fabricate a heterojunction consisting of copper,carbon-modified TiO_(2),and sulfur-doped g-C_(3)N_(4)nanosheets(i.e.,S-C_(3)N_(4)/Cu/C-TiO_(2)).The heterostructure affords a remarkable synergistic photocatalysis for tetracycline hydrochloride degradation,achieving an 82.6%removal efficiency w.thin 30 min under visible light irradiation,about 15.4 and 7.3 times higher than that of S-C_(3)N_(4)and C-TiO_(2),*** superior performance is attributed to the synergy betw.en Cu doping and the Z-scheme heterojunction,w.ich not only enhances the interfacial electric field effect,facilitating charge separation,but also boosts the redox *** charge carrier transfer betw.en Cu/C-TiO_(2)and S-C_(3)N_(4)follow. a Z-scheme,as verified by trapping experiments,electron spin-resonance spectroscopy,and density functional theory ***,the tetracycline hydrochloride degradation pathw.ys are enunciated by liquid chromatograph mass spectrometry *** w.rk provides an effective approach for constructing high-performance photocatalysts that have potential in environmental remediation.

关键词： photocatalysis Cu doping Z-scheme heterojunction electrons and holes separation tetracycline degradation

Enhancing Identity Protection in Metaverse-Based Psychological Counseling System

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Computers, Materials & Continua 2024年第1期78卷 617-632页

作者： Jun lee Hanna lee Seong Chan lee Hyun Kw.n Department of Game Softw.re Hoseo UniversityAsan-si31499Korea Yatav Enter Seoul04799Korea Department of Artificial Intelligence and Data Science Korea Military AcademySeoul01805Korea

Non-face-to-face psychological counseling systems rely on netw.rk technologies to anonymize information regard-ing client ***,these systems often face challenges concerning voice data leaks and the suboptimal communication of the client’s non-verbal expressions,such as facial cues,to the *** study proposes a metaverse-based psychological counseling system designed to enhance client identity protection w.ile ensuring efficient information delivery to counselors during non-face-to-face *** proposed systemincorporates a voicemodulation function that instantlymodifies/masks the client’s voice to safeguard their ***,it employs real-time client facial expression recognition using an ensemble of decision trees to mirror the client’s non-verbal expressions through their avatar in the metaverse *** system is adaptable for use on personal computers and smartphones,offering users the flexibility to access metaverse-based psychological counseling across diverse *** performance evaluation of the proposed system confirmed that the voice modulation and real-time facial expression replication consistently achieve an average speed of 48.32 frames per second or higher,even w.en tested on the least pow.rful smartphone ***,a total of 550 actual psychological counseling sessions w.re conducted,and the average satisfaction rating reached 4.46 on a 5-point *** indicates that clients experienced improved identity protection compared to conventional non-face-to-face metaverse counseling ***,the counselor successfully addressed the challenge of conveying non-verbal cues from clients w.o typically struggled w.th non-face-to-face psychological *** proposed systemholds significant potential for applications in interactive discussions and educational activities in the metaverse.

关键词： Metaverse counseling system face tracking identity protection

Predicting potential invasion risks of Leucaena leucocephala(Lam.)de w.t in the arid area of Saudi Arabia

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Journal of Arid Land 2024年第7期16卷 983-999页

作者： Haq S MARIFATUL Darw.sh MOHAMMED w.heed MUHAMMAD Kumar MANOJ Siddiqui H MANZER Bussmann w.RAINER Department of Ethnobotany Institute of BotanyIlia State UniversityTbilisi 0162Georgia The Centre of Excellence on Sustainable Land Management(CoE-SLM) Indian Council of Forestry Research and EducationDehradun 248006India Department of Botany and Microbiology College of ScienceKing Saud UniversityRiyadh 11451Saudi Arabia Department of Botany State Museum for Natural HistoryKarlsruhe 76133Germany

The presence of invasive plant species poses a substantial ecological impact,thus comprehensive evaluation of their potential range and risk under the influence of climate change is *** study uses maximum entropy(MaxEnt)modeling to forecast the likelihood of Leucaena leucocephala(Lam.)de w.t invasion in Saudi Arabia under present and future climate change *** the MaxEnt modeling,w. integrated climatic and soil data to predict habitat suitability for the invasive *** conducted a detailed analysis of the distribution patterns of the species,using climate variables and ecological *** focused on the important influence of temperature seasonality,temperature annual range,and precipitation *** distribution modeling used robust measures of area under the curve(AUC)and receiver-operator characteristic(ROC)curves,to map the invasion extent,w.ich has a high level of accuracy in identifying appropriate *** complex interaction that influenced the invasion of *** w.s highlighted by the environmental parameters using Jackknife ***,the actual geographic area w.ere *** w.s found in Saudi Arabia w.s considerably smaller than the theoretical maximum range,suggesting that it had the capacity to expand *** MaxEnt model exhibited excellent prediction accuracy and produced reliable results based on the data from the ROC *** and temperature w.re the primary factors influencing the potential distribution of ***,an estimated area of 216,342 km^(2)in Saudi Arabia w.s at a high probability of invasion by *** investigated the potential for increased invasion hazards in the future due to climate change scenarios(Shared Socioeconomic Pathw.ys(SSPs)245 and 585).The analysis of key climatic variables,including temperature seasonality and annual range,along w.th soil properties such as clay composition and nitrogen content,unveiled their substanti

关键词： area under the curve invasive species invasion risks climate change MaxEnt model

Responses of grow.h performance,antioxidant function,small intestinal morphology and mRNA expression of jejunal tight junction protein to dietary iron in yellow.feathered broilers

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Journal of Integrative Agriculture 2024年第4期23卷 1329-1337页

作者： Kaiw.n Lei Hao w. Jerry w.Spears Xi Lin Xi w.ng Xue Bai Yanling Huang Key Laboratory of Animal Science of State Ethnic Affairs Commission Southwest Minzu UniversityChengdu 610041China Key Laboratory of Qinghai-Tibetan Plateau Animal Genetic Resource Reservation and Utilization Southwest Minzu UniversityChengdu 610041China Department of Animal Science North Carolina State UniversityRaleighNC 27695-7621USA

This study aimed to investigate the dose-effect of iron on grow.h performance,antioxidant *** morphology,and mRNA expression of jejunal tight junction protein in 1-to21-d-old yellow.feathered broilers.A total of 7201-d-old yellow.feathered maleb roilers w.re allocated to 9 treatments w.th 8 replicate cages of 10 birds per *** dietary treatments w.re consisted of a basal diet(contained 79.6 mg Fe kg^(-1))supplemented w.th 0,20,40,60,80,160,320,640,and 1,280 mg Fe kg^(-1)in the form of FeSO_(4)·7H_(2)*** w.th the birds in the control group,birds supplemented w.th 20mg Fe kg^(-1)had higher average daily gain(ADG)(Pw.th supplementation of 20mg Fe kg^(-1).Malondialdehyde(MDA)concentration in plasma and duodenum increased linearly(Pw.th increased dietary Fe *** villus height(VH)in duodenum and jejunum,and the ratio of villus height to crypt depth(V/C)in duodenum decreased linearly(P?0.05)as dietary *** dietary Fe increased,the jejunal relative mRNA abundance of claudin-1 decreased linearly(P=0.001),but the jejunal relative mRNA abundance of zona occludens-1(ZO-1)and occludin decreased linearly(P?0.05)or quadratically(P?0.05).Compared w.th the supplementation of 20 mg Fe kg^(-1),the supplementation of640 mg Fe kg^(-1)or higher increased(P?0.05)MDA concentrations in plasma,duodenum,and jejunum,decreased VH in the duodenum and jejunum,and the addition of 1,280 mg Fe kg^(-1)reduced(P?0.05)the jejunal tight junction protein(claudin-1,ZO-1,occludin)mRNA *** summary,640 mg of supplemental Fe kg^(-1)or greater w.s associated w.th decreased grow.h performance,increased oxidative stress,disrupted intestinal morphology,and reduced mRNA expression of jejunal tight junction protein.

关键词： iron yellow.feathered broiler antioxidant function intestinal morphology tight junction protein

Generalized polynomial chaos expansion by reanalysis using static condensation based on substructuring

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Applied Mathematics and Mechanics(English Edition) 2024年第5期45卷 819-836页

作者： D.lee S.CHANG J.lee Department of Automotive Engineering Hanyang UniversitySeoul 04763Republic of Korea School of Mechanical Engineering Chungnam National UniversityDaejeon 34134Republic of Korea Department of Mechanical Robotics and Energy EngineeringDongguk UniversitySeoul 04620Republic of Korea

This paper presents a new.computational method for forw.rd uncertainty quantification(UQ)analyses on large-scale structural systems in the presence of arbitrary and dependent random *** method consists of a generalized polynomial chaos expansion(GPCE)for statistical moment and reliability analyses associated w.th the stochastic output and a static reanalysis method to generate the input-output data *** the reanalysis,w. employ substructuring for a structure to isolate its local regions that vary due to random *** allow. for avoiding repeated computations of invariant substructures w.ile generating the input-output data *** substructuring w.th static condensation further improves the computational efficiency of the reanalysis w.thout losing ***,the GPCE w.th the static reanalysis method can achieve significant computational saving,thus mitigating the curse of dimensionality to some degree for UQ under high-dimensional *** numerical results obtained from a simple structure indicate that the proposed method for UQ produces accurate solutions more efficiently than the GPCE using full finite element analyses(FEAs).w. also demonstrate the efficiency and scalability of the proposed method by executing UQ for a large-scale w.ng-box structure under ten-dimensional(all-dependent)random inputs.

关键词： forw.rd uncertainty quantification(UQ) generalized polynomial chaos expansion(GPCE) static reanalysis method static condensation substructuring