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A Graphical User Authentication with Compass Direction and Rotation-Based Dual-Derivation 认领 引用
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作者 Chin Soon Ku Hui Yi Lim +5 位作者 Ana Nabilah Binti Sa’uadi Siew Cheng Lai Jit Theam Lim Pei Xuan Ku Zeng-Wei Hong Lip Yee Por 《Computers, Materials & Continua》 SCIE EI 2026年第9期1280-1296,共17页
In the expanding Internet of Things(IoT)ecosystem,billions of interconnected devices exchange sensitive data,making secure and usable authentication critical.IoT devices in public or shared environments are vulnerable... In the expanding Internet of Things(IoT)ecosystem,billions of interconnected devices exchange sensitive data,making secure and usable authentication critical.IoT devices in public or shared environments are vulnerable to shoulder-surfing and video recorded observation attacks.Traditional passwords and static graphical schemes remain susceptible due to predictable patterns and direct credential entry.This study presents a novel recognition-based graphical authentication scheme that combines pass-image selection with compass direction substitution and rotation logic to resist observation-based attacks.A prototype was evaluated with 58 participants over three days.Usability metrics included registration time,login time,success rate,and error rate.Memorability and resistance to shoulder-surfing were also assessed.Results showed that login times decreased from 43.62 to 37.78 s,while success rates increased from 40%to 53%,indicating rapid adaptation.Memorability scores improved from 2.05 to 2.19 on a 3-point scale,with perfect recall for five-image passwords by Day 3.Shoulder-surfing tests recorded a 0%attacker success rate.The preliminary results suggest that the scheme offers a useful balance of usability,memorability,and resistance to single session observation attacks.Future work will explore adaptive complexity and accessibility features to further enhance secure authentication. 展开更多
关键词 Graphical user authentication compass direction rotation pattern dual-derivation shoulder-surfing attack video recording attack
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Probabilistic Graphical Model-Based Operational Reliability-Centric Design of Offshore Wind Farm Feeder Layouts 认领 引用
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作者 Qiuyu Lu Yunqi Yan +4 位作者 Yang Liu Ying Chen Yinguo Yang Tannan Xiao Guobing Wu 《Energy Engineering》 EI 2025年第12期4799-4814,共16页
The rapid expansion of offshore wind energy necessitates robust and cost-effective electrical collector system(ECS)designs that prioritize lifetime operational reliability.Traditional optimization approaches often sim... The rapid expansion of offshore wind energy necessitates robust and cost-effective electrical collector system(ECS)designs that prioritize lifetime operational reliability.Traditional optimization approaches often simplify reliability considerations or fail to holistically integrate them with economic and technical constraints.This paper introduces a novel,two-stage optimization framework for offshore wind farm(OWF)ECS planning that systematically incorporates reliability.The first stage employs Mixed-Integer Linear Programming(MILP)to determine an optimal radial network topology,considering linearized reliability approximations and geographical constraints.The second stage enhances this design by strategically placing tie-lines using a Mixed-Integer Quadratically Constrained Program(MIQCP).This stage leverages a dynamic-aware adaptation of Multi-Source Multi-Terminal Network Reliability(MSMT-NR)assessment,with its inherent nonlinear equations successfully transformed into a solvable MIQCP form for loopy networks.A benchmark case study demonstrates the framework’s efficacy,illustrating how increasing the emphasis on reliability leads to more distributed and interconnected network topologies,effectively balancing investment costs against enhanced system resilience. 展开更多
关键词 Offshore wind farm feeder layout optimization network reliability nonlinear optimization probabilistic graphical model
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Visualizing medicine:The case for implementing graphical abstracts in clinical reporting 认领 引用
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作者 Naveen Jeyaraman Madhan Jeyaraman +2 位作者 Swaminathan Ramasubramanian Sangeetha Balaji Arulkumar Nallakumarasamy 《World Journal of Methodology》 2025年第2期1-8,共8页
Graphical abstracts(GAs)are emerging as a pivotal tool in medical literature,enhancing the dissemination and comprehension of complex clinical data through visual summaries.This editorial highlights the significant ad... Graphical abstracts(GAs)are emerging as a pivotal tool in medical literature,enhancing the dissemination and comprehension of complex clinical data through visual summaries.This editorial highlights the significant advantages of GAs,including improved clarity,increased reader engagement,and enhanced visibility of research findings.By transforming intricate scientific data into accessible visual formats,these abstracts facilitate quick and effective knowledge transfer,crucial in clinical decision-making and patient care.However,challenges such as potential data misrepresentation due to oversimplification,the skill gap in graphic design among researchers,and the lack of standardized creation guidelines pose barriers to their widespread adoption.Additionally,while software such as Adobe Illustrator,BioRender,and Canva are commonly employed to create these visuals,not all researchers may be proficient in their use.To address these issues,we recommend that academic journals establish clear guidelines and provide necessary design training to researchers.This proactive approach will ensure the creation of high-quality GAs,promote their standardization,and expand their use in clinical reporting,ultimately benefiting the medical community and improving healthcare outcomes. 展开更多
关键词 Graphical abstracts Clinical data dissemination Visual communication Research impact Academic publishing
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A Secure Authentication Indexed Choice-Based Graphical Password Scheme for Web Applications and ATMs 认领 引用
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作者 Sameh Zarif Hadier Moawad +4 位作者 Khalid Amin Abdullah Alharbi Wail SElkilani Shouze Tang Marian Wagdy 《Computer Systems Science & Engineering》 2025年第1期79-98,共20页
Authentication is the most crucial aspect of security and a predominant measure employed in cybersecurity.Cloud computing provides a shared electronic device resource for users via the internet,and the authentication ... Authentication is the most crucial aspect of security and a predominant measure employed in cybersecurity.Cloud computing provides a shared electronic device resource for users via the internet,and the authentication techniques used must protect data from attacks.Previous approaches failed to resolve the challenge of making passwords secure,memorable,usable,and time-saving.Graphical Password(GP)is still not widely utilized in reality because consumers suffer from multiple login stages.This paper proposes an Indexed Choice-Based Graphical Password(ICGP)scheme for improving the authentication part.ICGP consists of two stages:registration and authentication.At the registration stage,the user registers his/her data user name a number called Index Number(IN),and chooses an image from a grid of images.After completing the registration,ICGP gives the user a random unique number(UNo)to be a user ID.At the authentication stage,the user chooses a different image from the grid based on the random appearance of the registered image dimensions on the grid plus the registered Index Number.ICGP password is a combination of three factors;user’s name,UNo,and any image.According to the experiments,the proposed ICGP has achieved great improvements when compared to prior methods.The ICGP has increased the possible password numbers from 9.77e+6 to 3.74e+30,the password space from 1.20e+34 to 1.37e+84,and decreased the password entropy from 7.16e−7 to 8.26e−30. 展开更多
关键词 Authentication graphical password indexed choice-based graphical password user image system user number index number password space password entropy
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基于Graphical Lasso网络分析的日间过度嗜睡与非嗜睡帕金森病患者非运动症状关系研究 认领 引用
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作者 刘婧玥 林子昂 +3 位作者 冯焕焕 许保磊 刘疏影 许二赫 《中风与神经疾病杂志》 CAS 2025年第11期1024-1028,共5页
目的采用Graphical Lasso(GLASSO)网络分析方法探讨帕金森病(PD)患者日间过度嗜睡(EDS)与其他非运动症状(NMS)之间的关联,并分析嗜睡-嗅觉-情绪轴在EDS发生中的可能作用。方法选取2023年2月—2024年2月于首都医科大学宣武医院就诊的500... 目的采用Graphical Lasso(GLASSO)网络分析方法探讨帕金森病(PD)患者日间过度嗜睡(EDS)与其他非运动症状(NMS)之间的关联,并分析嗜睡-嗅觉-情绪轴在EDS发生中的可能作用。方法选取2023年2月—2024年2月于首都医科大学宣武医院就诊的500例PD患者,根据埃普沃斯嗜睡量表(ESS)评分分为嗜睡组(ESS≥10分)和非嗜睡组(ESS<10分)。收集患者一般临床资料,并采用NMSS、HAMA、HAMD、PDSS、RBDQHK、MoCA、MMSE、QOD-F等量表评估非运动症状。通过Graphical Lasso构建PD非运动症状网络,并计算节点中心性指标评估EDS在NMS网络中的核心作用。结果EDS在本研究人群中的发生率为7.12%。与非嗜睡组相比,嗜睡组患者的HAMA、HAMD、NMSS、PDSS及RBDQ-HK评分显著更高(P<0.05)。网络分析结果显示,在非嗜睡组中,NMSS具有最高中心性(Strength=0.906),为非运动症状网络的核心节点。嗜睡状态下,嗅觉功能的Strength值显著上升(0.930),取代NMSS成为网络核心,同时RBDQ-HK的影响力增强(Strength=0.318)。结论PD患者的EDS与多种非运动症状密切相关,嗜睡状态可能改变PD非运动症状的网络结构。嗜睡-嗅觉-情绪轴在EDS发生中的作用值得进一步探讨。 展开更多
关键词 帕金森病 日间过度嗜睡 非运动症状 Graphical Lasso 症状网络分析
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Ptychographical Imaging Algorithm with a Single Random Phase Encoding 认领 引用 被引量：10
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作者 SHI Yi-Shi WANG Ya-Li +4 位作者 LI Tuo GAO Qian-Kun WAN Hao ZHANG San-Guo WU Zhi-Bo 《Chinese Physics Letters》 SCIE EI CAS CSCD 2013年第7期84-87,共4页
A single random phase encoding is introduced into ptychography for the first time.Since the diffractive wave front is encoded with the random phase modulator,the information of the sample cooperated with each probe ca... A single random phase encoding is introduced into ptychography for the first time.Since the diffractive wave front is encoded with the random phase modulator,the information of the sample cooperated with each probe can be uniformly distributed onto an entire diffraction pattern.It leads to the much faster convergent speed of the iterative algorithm for ptychographical imaging.It is more important for practice that the robustness to resist the noises and especially the transverse shift errors of probes are considerably improved compared with the conventional ptychographic algorithm. 展开更多
关键词 graphical uniformly convergent
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Discrete-time dynamic graphical games:model-free reinforcement learning solution 认领 引用 被引量：9
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作者 Mohammed I.ABOUHEAF Frank L.LEWIS +1 位作者 Magdi S.MAHMOUD Dariusz G.MIKULSKI 《Control Theory and Technology》 EI CSCD 2015年第1期55-69,共15页
This paper introduces a model-free reinforcement learning technique that is used to solve a class of dynamic games known as dynamic graphical games. The graphical game results from to make all the agents synchronize t... This paper introduces a model-free reinforcement learning technique that is used to solve a class of dynamic games known as dynamic graphical games. The graphical game results from to make all the agents synchronize to the state of a command multi-agent dynamical systems, where pinning control is used generator or a leader agent. Novel coupled Bellman equations and Hamiltonian functions are developed for the dynamic graphical games. The Hamiltonian mechanics are used to derive the necessary conditions for optimality. The solution for the dynamic graphical game is given in terms of the solution to a set of coupled Hamilton-Jacobi-Bellman equations developed herein. Nash equilibrium solution for the graphical game is given in terms of the solution to the underlying coupled Hamilton-Jacobi-Bellman equations. An online model-free policy iteration algorithm is developed to learn the Nash solution for the dynamic graphical game. This algorithm does not require any knowledge of the agents＇ dynamics. A proof of convergence for this multi-agent learning algorithm is given under mild assumption about the inter-connectivity properties of the graph. A gradient descent technique with critic network structures is used to implement the policy iteration algorithm to solve the graphical game online in real-time. 展开更多
关键词 Dynamic graphical games Nash equilibrium discrete mechanics optimal control model-free reinforcementlearning policy iteration
A Novel Distributed Optimal Adaptive Control Algorithm for Nonlinear Multi-Agent Differential Graphical Games 认领 引用 被引量：12
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作者 Majid Mazouchi Mohammad Bagher Naghibi-Sistani Seyed Kamal Hosseini Sani 《IEEE/CAA Journal of Automatica Sinica》 SCIE EI CSCD 2018年第1期331-341,共11页
In this paper, an online optimal distributed learning algorithm is proposed to solve leader-synchronization problem of nonlinear multi-agent differential graphical games. Each player approximates its optimal control p... In this paper, an online optimal distributed learning algorithm is proposed to solve leader-synchronization problem of nonlinear multi-agent differential graphical games. Each player approximates its optimal control policy using a single-network approximate dynamic programming(ADP) where only one critic neural network(NN) is employed instead of typical actorcritic structure composed of two NNs. The proposed distributed weight tuning laws for critic NNs guarantee stability in the sense of uniform ultimate boundedness(UUB) and convergence of control policies to the Nash equilibrium. In this paper, by introducing novel distributed local operators in weight tuning laws, there is no more requirement for initial stabilizing control policies. Furthermore, the overall closed-loop system stability is guaranteed by Lyapunov stability analysis. Finally, Simulation results show the effectiveness of the proposed algorithm. 展开更多
关键词 Approximate dynamic programming(ADP) distributed control neural networks(NNs) nonlinear differentia graphical games optimal control
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A graphical model for haloanhydrite components and P-wave velocity:A case study of haloanhydrites in Amu Darya Basin 认领 引用 被引量：2
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作者 Guo Tong-Cui Wang Hong-Jun +4 位作者 Mu Long-Xin Zhang Xing-Yang Ma Zhi Tian Yu Li Hao-Chen 《Applied Geophysics》 SCIE CSCD 2016年第3期459-468,579,共10页
Wave velocities in haloanhydrites are difficult to determine and significantly depend on the mineralogy. We used petrophysical parameters to study the wave velocity in haloanhydrites in the Amur Darya Basin and constr... Wave velocities in haloanhydrites are difficult to determine and significantly depend on the mineralogy. We used petrophysical parameters to study the wave velocity in haloanhydrites in the Amur Darya Basin and constructed a template of the relation between haloanhydrite mineralogy （anhydrite, salt, mudstone, and pore water） and wave velocities. We used the relation between the P-wave rnoduli ratio and porosity as constraint and constructed a graphical model （petrophysical template） for the relation between wave velocity, mineral content and porosity. We tested the graphical model using rock core and well logging data. 展开更多
关键词 Salt anhydrite graphical model P-wave velocity Ainu Darya Basin
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3D graphical visualization of the genetic architectures underlying complex traits in multiple environments 认领 引用 被引量：1
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作者 HU Cheng-cheng YE Xiu-zi +3 位作者 ZHANG Yin YU Rong-dong YANG Jian ZHU Jun 《Journal of Zhejiang University-SCIENCE A》 SCIE EI CAS 2007年第4期563-567,共5页
An approach for generating interactive 3D graphical visualization of the genetic architectures of complex traits in multiple environments is described. 3D graphical visualization is utilized for making improvements on... An approach for generating interactive 3D graphical visualization of the genetic architectures of complex traits in multiple environments is described. 3D graphical visualization is utilized for making improvements on traditional plots in quan- titative trait locus (QTL) mapping analysis. Interactive 3D graphical visualization for abstract expression of QTL, epistasis and their environmental interactions for experimental populations was developed in framework of user-friendly software QTLNetwork (http://gffzzbe43f054107d49d7hpno9buvbxcbc6pwx.ffgz.tsg.suse.edu.cn/software/qtlnetwork). Novel definition of graphical meta system and computation of virtual coordinates are used to achieve explicit but meaningful visualization. Interactive 3D graphical visualization for QTL analysis provides geneticists and breeders a powerful and easy-to-use tool to analyze and publish their research results. 展开更多
关键词 Ouantitative trait locus （QTL） Visualization 3D graphical Interactive visualization
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Recent advances in parametric neuroreceptor mapping with dynamic PET:basic concepts and graphical analyses 认领 引用 被引量：1
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作者 Seongho Seo Su Jin Kim +1 位作者 Dong Soo Lee Jae Sung Lee 《Neuroscience Bulletin》 SCIE CAS CSCD 2014年第5期733-754,共22页
Tracer kinetic modeling in dynamic positron emission tomography （PET） has been widely used to investigate the characteristic distribution patterns or dysfunctions of neuroreceptors in brain diseases. Its practical g... Tracer kinetic modeling in dynamic positron emission tomography （PET） has been widely used to investigate the characteristic distribution patterns or dysfunctions of neuroreceptors in brain diseases. Its practical goal has progressed from regional data quantification to parametric mapping that produces images of kinetic-model parameters by fully exploiting the spatiotemporal information in dynamic PET data. Graphical analysis （GA） is a major parametric mapping technique that is independent on any compartmental model configuration, robust to noise, and computationally efficient. In this paper, we provide an overview of recent advances in the parametric mapping of neuroreceptor binding based on GA methods. The associated basic concepts in tracer kinetic modeling are presented, including commonly-used compartment models and major parameters of interest. Technical details of GA approaches for reversible and irreversible radioligands are described, considering both plasma input and reference tissue input models. Their statistical properties are discussed in view of parametric imaging. 展开更多
关键词 dynamic positron emission tomography graphical analysis neuroreceptor imaging parametric image tracer kinetic modeling
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A unified graphical method for integration of hydrogen networks with purification reuse 认领 引用 被引量：2
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作者 Minbo Yang Xiao Feng Guilian Liu 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2016年第7期891-896,共6页
Introducing purifiers into hydrogen network can enhance the recovery and reuse of hydrogen in refineries, further reducing the consumption of fresh hydrogen. Based on previous graphical methods, this work proposes a s... Introducing purifiers into hydrogen network can enhance the recovery and reuse of hydrogen in refineries, further reducing the consumption of fresh hydrogen. Based on previous graphical methods, this work proposes a simple and unified graphical method for integration of hydrogen networks with purification processes. Scenarios with different hydrogen concentrations of purified product can be analyzed by the unified procedure. As a result, the maximum hydrogen saved by purification reuse can he identified and the corresponding purification process can be optimized, The proposed method is easy and non-iterative, and it is valid to purification processes with any feed concentration. A conventional hydrogen network is analyzed to test the effectiveness of the proposed method. 展开更多
关键词 Graphical methodHydrogen networkPinchPurification reuse
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Some computer graphical user interfaces in radiation therapy 认领 引用 被引量：1
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作者 James C L Chow 《World Journal of Radiology》 2016年第3期255-267,共13页
In this review,five graphical user interfaces(GUIs)used in radiation therapy practices and researches are introduced.They are:(1)the treatment time calculator,superficialx-ray treatment time calculator(SUPCALC)used in... In this review,five graphical user interfaces(GUIs)used in radiation therapy practices and researches are introduced.They are:(1)the treatment time calculator,superficialx-ray treatment time calculator(SUPCALC)used in the superficial X-ray radiation therapy;(2)the monitor unit calculator,electron monitor unit calculator(EMUC)used in the electron radiation therapy;(3)the multileaf collimator machine file creator,sliding window intensity modulated radiotherapy(SWIMRT)used in generating fluence map for research and quality assurance in intensity modulated radiation therapy;(4)the treatment planning system,DOSCTP used in the calculation of 3D dose distribution using Monte Carlo simulation;and(5)the monitor unit calculator,photon beam monitor unit calculator(PMUC)used in photon beam radiation therapy.One common issue of these GUIs is that all user-friendly interfaces are linked to complex formulas and algorithms based on various theories,which do not have to be understood and noted by the user.In that case,user only needs to input the required information with help from graphical elements in order to produce desired results.SUPCALC is a superficial radiation treatment time calculator using the GUI technique to provide a convenient way for radiation therapist to calculate the treatment time,and keep a record for the skin cancer patient.EMUC is an electron monitor unit calculator for electron radiation therapy.Instead of doing hand calculation according to pre-determined dosimetric tables,clinical user needs only to input the required drawing of electron field in computer graphical file format,prescription dose,and beam parameters to EMUC to calculate the required monitor unit for the electron beam treatment.EMUC is based on a semi-experimental theory of sector-integration algorithm.SWIMRT is a multileaf collimator machine file creator to generate a fluence map produced by a medical linear accelerator.This machine file controls the multileaf collimator to deliver intensity modulated beams for a specific fluence map used in quality assurance or research.DOSCTP is a treatment planning system using the computed tomography images.Radiation beams(photon or electron)with different energies and field sizes produced by a linear accelerator can be placed in different positions to irradiate the tumour in the patient.DOSCTP is linked to a Monte Carlo simulation engine using the EGSnrc-based code,so that 3D dose distribution canbe determined accurately for radiation therapy.Moreover,DOSCTP can be used for treatment planning of patient or small animal.PMUC is a GUI for calculation of the monitor unit based on the prescription dose of patient in photon beam radiation therapy.The calculation is based on dose corrections in changes of photon beam energy,treatment depth,field size,jaw position,beam axis,treatment distance and beam modifiers.All GUIs mentioned in this review were written either by the Microsoft Visual Basic.net or a MATLAB GUI development tool called GUIDE.In addition,all GUIs were verified and tested using measurements to ensure their accuracies were up to clinical acceptable levels for implementations. 展开更多
关键词 Graphical user interface Cancer treatment Treatment planning Radiotherapy Monitor unit calculation
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Decomposition of Covariate-Dependent Graphical Models with Categorical Data 认领 引用
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作者 Binghui Liu Jianhua Guo 《Communications in Mathematical Research》 CSCD 2023年第3期414-436,共23页
Graphical models are wildly used to describe conditional dependence relationships among interacting random variables.Among statistical inference problems of a graphical model,one particular interest is utilizing its i... Graphical models are wildly used to describe conditional dependence relationships among interacting random variables.Among statistical inference problems of a graphical model,one particular interest is utilizing its interaction structure to reduce model complexity.As an important approach to utilizing structural information,decomposition allows a statistical inference problem to be divided into some sub-problems with lower complexities.In this paper,to investigate decomposition of covariate-dependent graphical models,we propose some useful definitions of decomposition of covariate-dependent graphical models with categorical data in the form of contingency tables.Based on such a decomposition,a covariate-dependent graphical model can be split into some sub-models,and the maximum likelihood estimation of this model can be factorized into the maximum likelihood estimations of the sub-models.Moreover,some sufficient and necessary conditions of the proposed definitions of decomposition are studied. 展开更多
关键词 Collapsibility contingency tables covariate-dependent decomposition graphical models
Calculation of angular glint in near field utilizing graphical electromagnetic computing 认领 引用 被引量：2
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作者 Guangfu Zhang Chao Wang +2 位作者 Liguo Liu Yunqi Fu Naichang Yuan 《Journal of Systems Engineering and Electronics》 SCIE EI CSCD 2013年第6期906-911,共6页
The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） ... The angular glint in the near field plays an important role on radar tracking errors. To predict it more efficiently for electrically large targets, a new method based on graphical electromagnetic computing （GRECO） is proposed. With the benefit of the graphic card, the GRECO prediction method is faster and more accurate than other methods. The proposed method at the first time considers the special case that the targets cannot be completely covered by radar beams, which makes the prediction of radar tracking errors more self-contained in practical circumstances. On the other hand, the process of the scattering center extraction is omitted, resulting in possible angular glint prediction in real time. Comparisons between the simulation results and the theoretical ones validate its correctness and value to academic research and engineering applications. 展开更多
关键词 angular glint near field tracking error graphical electromagnetic computing （GRECO）
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Graphical method based on modified maximum force criterion to indicate forming limit curves of 22MnB5 boron steel sheets at elevated temperatures 认领 引用 被引量：1
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作者 Thanh Luyen Quoc-Tuan Pham +2 位作者 Thi-Bich Mac Tien-Long Banh Duc-Toan Nguyen 《Journal of Iron and Steel Research International》 SCIE EI CAS CSCD 2021年第8期1009-1018,共10页
A new approach for predicting forming limit curves(FLCs)at elevated temperatures was proposed herein.FLCs are often used to predict failure and determine the optimal forming parameters of automotive parts.First,a grap... A new approach for predicting forming limit curves(FLCs)at elevated temperatures was proposed herein.FLCs are often used to predict failure and determine the optimal forming parameters of automotive parts.First,a graphical method based on a modified maximum force criterion was applied to estimate the FLCs of 22MnB5 boron steel sheets at room temperature using various hardening laws.Subsequently,the predicted FLC data at room temperature were compared with corresponding data obtained from Nakazima's tests to obtain the best prediction.To estimate the FLC at elevated temperatures,tensile tests were conducted at various temperatures to determine the ratios of equivalent fracture strains between the corresponding elevated temperatures and room temperature.FLCs at elevated temperatures could be established based on obtained ratios.However,the predicted FLCs at elevated temperatures did not agree well with the corresponding FLC experimental data of Zhou et al.A new method was proposed herein to improve the prediction of FLCs at elevated temperatures.An FLC calculated at room tem-perature was utilized to predict the failure of Nakazima's samples via finite element simulation.Based on the simulation results at room temperature,the mathematical relationships between the equivalent ductile fracture strain versus stress triaxiality and strain ratio were established and then combined with ratios between elevated and room temperatures to calculate the FLCs at different temperatures.The predicted FLCs at elevated temperatures agree well with the corresponding experimental FLC data. 展开更多
关键词 Forming limit curve Modified maximum force criterion Graphical method Hardening law Finite element method Boron steel sheet Elevated temperature
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A graphical user interface(GUI)for model-based radiation-induced acoustic computed tomography 认领 引用
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作者 Michelle Simon Prabodh Kumar Pandey +1 位作者 Leshan Sun Liangzhong Xiang 《Journal of Innovative Optical Health Sciences》 SCIE EI CSCD 2023年第1期39-53,共15页
Radiation-induced acoustic computed tomography(RACT)is an evolving biomedical imaging modality that aims to reconstruct the radiation energy deposition in tissues.Traditional backprojection(BP)reconstructions carry no... Radiation-induced acoustic computed tomography(RACT)is an evolving biomedical imaging modality that aims to reconstruct the radiation energy deposition in tissues.Traditional backprojection(BP)reconstructions carry noisy and limited-view artifacts.Model-based algorithms have been demonstrated to overcome the drawbacks of BPs.However,model-based algorithms are relatively more complex to develop and computationally demanding.Furthermore,while a plethora of novel algorithms has been developed over the past decade,most of these algorithms are either not accessible,readily available,or hard to implement for researchers who are not well versed in programming.We developed a user-friendly MATLAB-based graphical user interface(GUI;RACT2D)that facilitates back-projection and model-based image reconstructions for twodimensional RACT problems.We included numerical and experimental X-ray-induced acoustic datasets to demonstrate the capabilities of the GUI.The developed algorithms support parallel computing for evaluating reconstructions using the cores of the computer,thus further accelerating the reconstruction speed.We also share the MATLAB-based codes for evaluating RACT reconstructions,which users with MATLAB programming expertise can further modify to suit their needs.The shared GUI and codes can be of interest to researchers across the globe and assist them in e±cient evaluation of improved RACT reconstructions. 展开更多
关键词 Radiation-induced acoustic computed tomography(RACT) image reconstruction graphical user interface(GUI) photoacoustic tomography
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Graphical representations and worm algorithms for the O(N) spin model 认领 引用
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作者 Longxiang Liu Lei Zhang +1 位作者 Xiaojun Tan Youjin Deng 《Communications in Theoretical Physics》 SCIE CAS CSCD 2023年第11期152-161,共10页
We present a family of graphical representations for the O(N)spin model,where N≥1 represents the spin dimension,and N=1,2,3 corresponds to the Ising,XY and Heisenberg models,respectively.With an integer parameter 0≤... We present a family of graphical representations for the O(N)spin model,where N≥1 represents the spin dimension,and N=1,2,3 corresponds to the Ising,XY and Heisenberg models,respectively.With an integer parameter 0≤ℓ≤N/2,each configuration is the coupling of ℓ copies of subgraphs consisting of directed flows and N−2ℓ copies of subgraphs constructed by undirected loops,which we call the XY and Ising subgraphs,respectively.On each lattice site,the XY subgraphs satisfy the Kirchhoff flow-conservation law and the Ising subgraphs obey the Eulerian bond condition.Then,we formulate worm-type algorithms and simulate the O(N)model on the simple-cubic lattice for N from 2 to 6 at all possibleℓ.It is observed that the worm algorithm has much higher efficiency than the Metropolis method,and,for a given N,the efficiency is an increasing function ofℓ.Besides Monte Carlo simulations,we expect that these graphical representations would provide a convenient basis for the study of the O(N)spin model by other state-of-the-art methods like the tensor network renormalization. 展开更多
关键词 Markov-chain Monte Carlo algorithms continuous spin models graphical representations
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VIDEO MULTI-TARGET TRACKING BASED ON PROBABILISTIC GRAPHICAL MODEL 认领 引用
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作者 Xu Feng Huang Chenrong +1 位作者 Wu Zhengjun Xu Lizhong 《Journal of Electronics(China)》 2011年第4期548-557,共10页
In the technique of video multi-target tracking,the common particle filter can not deal well with uncertain relations among multiple targets.To solve this problem,many researchers use data association method to reduce... In the technique of video multi-target tracking,the common particle filter can not deal well with uncertain relations among multiple targets.To solve this problem,many researchers use data association method to reduce the multi-target uncertainty.However,the traditional data association method is difficult to track accurately when the target is occluded.To remove the occlusion in the video,combined with the theory of data association,this paper adopts the probabilistic graphical model for multi-target modeling and analysis of the targets relationship in the particle filter framework.Ex-perimental results show that the proposed algorithm can solve the occlusion problem better compared with the traditional algorithm. 展开更多
关键词 Video tracking Multi-target tracking Data association Probabilistic graphical model Particle filter
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An Enhanced Graphical Authentication Scheme Using Multiple-Image Steganography 认领 引用
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作者 Khalil Hamdi Ateyeh Al-Shqeerat 《Computer Systems Science & Engineering》 SCIE EI 2023年第3期2095-2107,共13页
Most remote systems require user authentication to access resources.Text-based passwords are still widely used as a standard method of user authentication.Although conventional text-based passwords are rather hard to ... Most remote systems require user authentication to access resources.Text-based passwords are still widely used as a standard method of user authentication.Although conventional text-based passwords are rather hard to remember,users often write their passwords down in order to compromise security.One of the most complex challenges users may face is posting sensitive data on external data centers that are accessible to others and do not be controlled directly by users.Graphical user authentication methods have recently been proposed to verify the user identity.However,the fundamental limitation of a graphi-cal password is that it must have a colorful and rich image to provide an adequate password space to maintain security,and when the user clicks and inputs a pass-word between two possible grids,the fault tolerance is adjusted to avoid this situation.This paper proposes an enhanced graphical authentication scheme,which comprises benefits over both recognition and recall-based graphical techniques besides image steganography.The combination of graphical authentication and steganography technologies reduces the amount of sensitive data shared between users and service providers and improves the security of user accounts.To evaluate the effectiveness of the proposed scheme,peak signal-to-noise ratio and mean squared error parameters have been used. 展开更多
关键词 Security graphical authentication steganography peak signal to noise ratio mean squared error
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