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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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Modern Graphics APIs:Design Principles,A Use Case,and New Perspectives 认领 引用
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作者 Lu Ping Sun Qi +3 位作者 Wang Chen Guo Jie Guo Yanwen Shi Wenzhe 《ZTE Communications》 2026年第1期97-106,共10页
In this paper,we provide a comprehensive examination of the evolution of graphics Application Programming Interfaces(APIs).We begin by exploring traditional graphics APIs,elucidating their distinct features and inhere... In this paper,we provide a comprehensive examination of the evolution of graphics Application Programming Interfaces(APIs).We begin by exploring traditional graphics APIs,elucidating their distinct features and inherent challenges.This sets the stage for a detailed exploration of modern graphics APIs,with a focus on four critical design principles.These principles are further analyzed through specific case studies and categorical examinations.The paper then introduces MoerEngine,a bespoke rendering engine,as a practical case to demonstrate the real-world application of these modern principles in software engineering.In conclusion,the study offers insights into the potential future trajectory of graphics APIs,spotlighting emerging design patterns and technological innovations.It also ventures to predict the development trends and capabilities of next-generation graphics APIs. 展开更多
关键词 graphics API rendering design principle MoerEngine
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A Graphic Design Method for Broadband Doherty Power Amplifier 认领 引用
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作者 Xiao Feng Dai Zhijiang +2 位作者 Zhong Kang Gao Ruibin Li Mingyu 《China Communications》 SCIE EI CSCD 2026年第2期97-111,共15页
In this article,a graphic design method for broadband Doherty power amplifier(DPA) is proposed based on the basic principle of impedance matching with the help of Smith chart.The proposed graphic method avoids the com... In this article,a graphic design method for broadband Doherty power amplifier(DPA) is proposed based on the basic principle of impedance matching with the help of Smith chart.The proposed graphic method avoids the complex formula derivation in the traditional amplifier circuit design process,and the design process is more simple and intuitive.Besides,it only takes three steps to build the load modulation network(LMN) of two power amplifiers(PA) of the DPA.Besides,a capacitor is used to replace the parasitic parameters of the transistor,and the LMN designed in the two modes is used for exploration and comparison.Further more,the output impedance of the peaking PA is introduced to make the reflection coefficient trajectory on Smith chart lowfrequency dispersion so as to expand the bandwidth of the DPA at the output power back-off(OBO) level.It would not affect the performance of DPA in the saturation(SAT) state.In this way,a broadband DPA can be implemented easily.To validate the proposed design method,a broadband DPA operating from 1.9to 2.6 GHz is designed and measured based on the proposed method.Under the continuous-wave excitation,the fabricated DPA has a 6 dB OBO efficiency of 48%-56% and a SAT efficiency of 64%-73% from 1.75 to 2.45 GHz,and the peak output power is 48.9-49.8 dBm. 展开更多
关键词 broadband amplifier broadband matching de-embedding technique Doherty power amplifier graphic design method
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Latvia’s Next-gen Graphic Artists 认领 引用
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作者 Jeļena Koževnikova Ilze Lībiete 《Journal of Literature and Art Studies》 2025年第2期70-78,共9页
Conception of graphic art,is widely increased in nowadays,because of persistent acquire of new ideas and art practices,which is key feature of modern art.As a result,variety of graphic art grew heavily-constantly acqu... Conception of graphic art,is widely increased in nowadays,because of persistent acquire of new ideas and art practices,which is key feature of modern art.As a result,variety of graphic art grew heavily-constantly acquiring new aspects and experimenting with new materials,but also not forgetting about classic techniques of graphic art.That is why Latvia’s contemporary art is rich with outstanding graphics artists,which is masters of their profession.But time goes and everything sees it’s end,and on Latvia’s art horizon start to appear new faces and new talents of Latvia’s graphics art,which already had their opportunity to demonstrate highest level of their mastery and creativity,not only in Latvia,but also on international level.Living in a rhythm of modern fast-paced technology and innovation era,Latvia’s graphic artists,still say“Yes!”,to classic techniques of graphic art-linocutting,lithography and drypointing.However,they are open-minded persons and like to experiment with new techniques(for example-digiprint),or if it is suitable for their idea-combine them,to reach their goal.Aim of this paper is to get acquainted with Latvia’s next-gen graphic artists,their ideas and views,as well with results of their creative,acquiring brief review of Latvia’s graphic trends in general.As a result reader will become familiar not only with Latvia’s domestic artists and their creativity,but also will get general review of the current trends in the world of graphic art,which is not only classic,but also very innovative,regarding of new materials and techniques. 展开更多
关键词 graphic graphic’s techniques Latvia’s modern art graphic artists
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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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Structural Color Dynamic Graphics Display Based on Microlens Array 认领 引用 被引量：1
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作者 LI Xue-han LIU Ling-zhi +1 位作者 HUANG Min LI Xiu 《印刷与数字媒体技术研究》 CAS 北大核心 2025年第2期162-168,共7页
It is of great scientific significance to construct a 3D dynamic structural color with a special color effect based on the microlens array.However,the problems of imperfect mechanisms and poor color quality need to be... It is of great scientific significance to construct a 3D dynamic structural color with a special color effect based on the microlens array.However,the problems of imperfect mechanisms and poor color quality need to be solved.A method of 3D structural color turning on periodic metasurfaces fabricated by the microlens array and self-assembly technology was proposed in this study.In the experiment,Polydimethylsiloxane(PDMS)flexible film was used as a substrate,and SiO2 microspheres were scraped into grooves of the PDMS film to form 3D photonic crystal structures.By adjusting the number of blade-coated times and microsphere concentrations,high-saturation structural color micropatterns were obtained.These films were then matched with microlens arrays to produce dynamic graphics with iridescent effects.The results showed that by blade-coated two times and SiO2 microsphere concentrations of 50%are the best conditions.This method demonstrates the potential for being widely applied in the anticounterfeiting printing and ultra-high-resolution display. 展开更多
关键词 Structural color Microlens array Dynamic graphics display Moirémagnification Optical anti-counterfeiting
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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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NGP-ERGAS: Revisit Instant Neural Graphics Primitives with the Relative Dimensionless Global Error in Synthesis 认领 引用
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作者 Dongheng Ye Heping Li +2 位作者 Ning An Jian Cheng Liang Wang 《Computers, Materials & Continua》 SCIE EI 2025年第8期3731-3747,共17页
The newly emerging neural radiance fields(NeRF)methods can implicitly fulfill three-dimensional(3D)reconstruction via training a neural network to render novel-view images of a given scene with given posed images.The ... The newly emerging neural radiance fields(NeRF)methods can implicitly fulfill three-dimensional(3D)reconstruction via training a neural network to render novel-view images of a given scene with given posed images.The Instant Neural Graphics Primitives(Instant-NGP)method further improves the position encoding of NeRF.It obtains state-of-the-art efficiency.However,only a local pixel-wised loss is considered when training the Instant-NGP while overlooking the nonlocal structural information between pixels.Despite a good quantitative result,it leads to a poor visual effect,especially the completeness.Inspired by the stochastic structural similarity(S3IM)method that exploits nonlocal structural information of groups of pixels,this paper proposes a new method to improve the completeness of fast novel view synthesis.The proposed method first extends the thread-wised processing of the Instant-NGP to the processing in a customthread block(i.e.,a group of threads).Then,the relative dimensionless global error in synthesis,i.e.,Erreur Relative Globale Adimensionnelle de Synthese(ERGAS),of a group of pixels corresponding to a group of threads is computed and incorporated into the loss function.Extensive experiments validate the proposed method.It can obtain better quantitative results than the original Instant-NGP with fewer iteration steps.PSNR is increased by 1%.Amazing qualitative results are obtained,especially for delicate structures and details such as lines and continuous structures.With the dramatic improvements in the visual effects,our method can boost the practicability of implicit 3D reconstruction in applications such as self-driving and augmented reality. 展开更多
关键词 Neural radiance fields novel view synthesis 3D reconstruction graphic processing unit
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The Graphics Instruction Methods Are Quite Instrumental 认领 引用
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作者 Browne,Mazzuca 《Journal of Civil Engineering and Architecture》 2025年第12期607-619,共13页
This paper discusses the integration of graphic learning strategies and motivational issues for undergraduate architecture students learning of basic and introductory structures.Rethinking the topic’s instructional d... This paper discusses the integration of graphic learning strategies and motivational issues for undergraduate architecture students learning of basic and introductory structures.Rethinking the topic’s instructional design addresses the need for improved appeal,relevance,and engagement in the technical course,integrating graphic methods(precisely scaled drawing)in the scaffolded learning of complex tasks,and summary application in a problem-based final design project.Students are tasked to manually employ scaled drawing skills to represent the attributes of forces:magnitude,orientation,and action lines.These are indispensable in establishing graphic proofs to construct cognitive linkages to the accompanying computations accurately.Precisely drawing a multi-force loop leads to a math literacy where equations are not disconnected cognitively,but are generated consequentially from the graphics.This complex skill allows a better learning of truss design and through the use of layered force-loops,aka Maxwell’s diagram.The problem-based final design project is initiated through analyses of selected case studies,constructing links between the graphic learning methods of structures exercises to recognized,built projects by well-known designers.Most importantly,through discussion,the case studies serve as learning bridges between the technical procedures in basic structures to the design and refinement of the projects’formal shapes.The final project(a spanning structure,such as a bridge)is then design and analyzed by student teams,applying the learned skills in a critical-thinking setting.The graphics instruction methods are quite instrumental in the guided learning of complex tasks while the problem-based approach helps in motivating the students’critical learning of structures,encouraging a deeper appreciation between form and forces.Pedagogically,while these instructional methods show some marginal improvements in learning performance,initial student responses point to better attitudes towards the subject matter.Further studies are recommended to verify the merit of the instructional strategies,and desired knowledge transfers to the design studio. 展开更多
关键词 Architecture education structures graphics learning strategies
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Exploration and Practice of Ideological and Political Education in Engineering Graphics Digital Extracurricular Counseling Course 认领 引用
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作者 Guolin Xu Tianxiang Liu Liang Ma 《Journal of Contemporary Educational Research》 2025年第7期239-247,共9页
In the context of the deep integration of digitalization and innovation and entrepreneurship education,this study focuses on the characteristics of schools and courses,investigates students’expectations and needs for... In the context of the deep integration of digitalization and innovation and entrepreneurship education,this study focuses on the characteristics of schools and courses,investigates students’expectations and needs for ideological and political elements,and deeply explores ideological and political cases such as the Beidahuang spirit,Daqing spirit,model worker spirit,and role models around them.It explores the integration practice of“curriculum ideological and political”in extracurricular tutoring teaching of engineering graphics,aiming to guide students to establish patriotism,love for schools,knowledge of agriculture,and love for agriculture,and effectively enhance the coordinated development of students’graphic skills and ideological and political literacy.Practice has shown that integrating ideological and political resources,incorporating ideological and political elements into curriculum content and practical activities,can effectively enhance the collaborative development of students’graphic skills and ideological and political literacy.At the same time,it provides new ideas and references for expanding ideological and political education to extracurricular tutoring courses. 展开更多
关键词 Engineering graphics Course ideology and politics Innovation and entrepreneurship education Extracurricular tutoring courses Integration path
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Fast modeling of gravity gradients from topographic surface data using GPU parallel algorithm 认领 引用 被引量：1
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作者 Xuli Tan Qingbin Wang +2 位作者 Jinkai Feng Yan Huang Ziyan Huang 《Geodesy and Geodynamics》 CSCD 2021年第4期288-297,共10页
The gravity gradient is a secondary derivative of gravity potential,containing more high-frequency information of Earth’s gravity field.Gravity gradient observation data require deducting its prior and intrinsic part... The gravity gradient is a secondary derivative of gravity potential,containing more high-frequency information of Earth’s gravity field.Gravity gradient observation data require deducting its prior and intrinsic parts to obtain more variational information.A model generated from a topographic surface database is more appropriate to represent gradiometric effects derived from near-surface mass,as other kinds of data can hardly reach the spatial resolution requirement.The rectangle prism method,namely an analytic integration of Newtonian potential integrals,is a reliable and commonly used approach to modeling gravity gradient,whereas its computing efficiency is extremely low.A modified rectangle prism method and a graphical processing unit(GPU)parallel algorithm were proposed to speed up the modeling process.The modified method avoided massive redundant computations by deforming formulas according to the symmetries of prisms’integral regions,and the proposed algorithm parallelized this method’s computing process.The parallel algorithm was compared with a conventional serial algorithm using 100 elevation data in two topographic areas(rough and moderate terrain).Modeling differences between the two algorithms were less than 0.1 E,which is attributed to precision differences between single-precision and double-precision float numbers.The parallel algorithm showed computational efficiency approximately 200 times higher than the serial algorithm in experiments,demonstrating its effective speeding up in the modeling process.Further analysis indicates that both the modified method and computational parallelism through GPU contributed to the proposed algorithm’s performances in experiments. 展开更多
关键词 Gravity gradient Topographic surface data Rectangle prism method Parallel computation Graphical processing unit(GPU)
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Implementation of Sample Graphic Patterns on Derived Scientific/Technologic Documentary Figures 认领 引用
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作者 MENG Xiang-bao WANG Xiao-yu WANG Lei 《Computer Aided Drafting,Design and Manufacturing》 2013年第4期1-6,共6页
The presenting work deals with implementation of sample graphic patterns derived from published scientificechnologic documentation figures on numeric simulation of multiphase flow and FEM analysis of thin walled mecha... The presenting work deals with implementation of sample graphic patterns derived from published scientificechnologic documentation figures on numeric simulation of multiphase flow and FEM analysis of thin walled mechanical structures. First, geometric plane patterns in rectangular/circular form were demonstrated in contrast to gradual change style in color and graphic configuration. Next, selected artistic/graphic sample patterns were implemented in logo conceptual design and visual innovation storming. The way in editing the above original figures is 2D symmetry, rectangular array geometrically, and converting them in inverse color in software like PS. The objective of this work is to cultivate, explore and discipline trainees＇ visual ability in artistic/aesthetic appreciation, graphic communication and industrial design and application, thus laying ties closely among comprehensive university students from different majors on science, engineering, arts and humanity. 展开更多
关键词 sample graphic pattern art design graphic training innovation storming
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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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Identifying Materials of Photographic Images and Photorealistic Computer Generated Graphics Based on Deep CNNs 认领 引用 被引量：16
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作者 Qi Cui Suzanne McIntosh Huiyu Sun 《Computers, Materials & Continua》 SCIE EI 2018年第5期229-241,共13页
Currently,some photorealistic computer graphics are very similar to photographic images.Photorealistic computer generated graphics can be forged as photographic images,causing serious security problems.The aim of this... Currently,some photorealistic computer graphics are very similar to photographic images.Photorealistic computer generated graphics can be forged as photographic images,causing serious security problems.The aim of this work is to use a deep neural network to detect photographic images(PI)versus computer generated graphics(CG).In existing approaches,image feature classification is computationally intensive and fails to achieve realtime analysis.This paper presents an effective approach to automatically identify PI and CG based on deep convolutional neural networks(DCNNs).Compared with some existing methods,the proposed method achieves real-time forensic tasks by deepening the network structure.Experimental results show that this approach can effectively identify PI and CG with average detection accuracy of 98%. 展开更多
关键词 Image identification CNN DNN DCNNs computer generated graphics
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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
Complex hexagonal close-packed dendritic growth during alloy solidification by graphics processing unit-accelerated three-dimensional phase-field simulations:demo for Mg–Gd alloy 认领 引用 被引量：3
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作者 Sheng-Lan Yang Jing Zhong +5 位作者 Kai Wang Xun Kang Jian-Bao Gao Jiong Wang Qian Li Li-Jun Zhang 《Rare Metals》 SCIE EI CAS CSCD 2023年第10期3468-3484,共17页
In this study,insights into the effect of interfacial anisotropy on a complex hexagonal close-packed(hcp) dendritic growth during alloy solidification were gained by graphics processing unit(GPU)-accelerated three-dim... In this study,insights into the effect of interfacial anisotropy on a complex hexagonal close-packed(hcp) dendritic growth during alloy solidification were gained by graphics processing unit(GPU)-accelerated three-dimensional(3D) phase-field simulations,as demonstrated for a Mg-Gd alloy.An anisotropic phasefield model with finite interface dissipation was developed by incorporating the contribution of the anisotropy of interfacial energy into the total free energy functional.The modified spherical harmonic anisotropy function was then chosen for the hcp crystal.The GPU parallel computing algorithm was implemented in the present phase-field model,and a corresponding code was developed in the compute unified device architecture parallel computing platform.Benchmark tests indicated that the calculation efficiency of a single TESLA V100 GPU could be~80times that of open multi-processing(OpenMP) with eight central processing unit cores.By coupling the phase-field model with reliable thermodynamic and interfacial energy descriptions,the 3D phase-field simulation of α-Mg dendritic growth in the Mg-6Gd(in wt%) alloy during solidification was performed.Various two-dimensional dendrite morphologies were revealed by cutting the simulated 3D dendrite along different crystallographic planes.Typical sixfold equiaxed and butterflied microstructures observed in experiments were well reproduced. 展开更多
关键词 Interfacial anisotropy Dendrite solidification Phase-field model Graphics processing unit(GPU) Mg–Gd
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星间差分GRAPHIC观测量单频精密单点定位算法 认领 引用 被引量：3
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作者 阮仁桂 吴显兵 +1 位作者 冯来平 王夕伟 《测绘科学技术学报》 北大核心 2012年第1期24-27,共4页
提出了一种基于星间差分GRAPHIC观测量的单频精密单点定位算法,采用正反向滤波实现了静态和动态解算功能。该算法的优点是不需要外部电离层模型进行电离层延迟改正。采用4个IGS站7d的数据和一组机载GPS动态数据进行解算实验,结果表明:... 提出了一种基于星间差分GRAPHIC观测量的单频精密单点定位算法,采用正反向滤波实现了静态和动态解算功能。该算法的优点是不需要外部电离层模型进行电离层延迟改正。采用4个IGS站7d的数据和一组机载GPS动态数据进行解算实验,结果表明:静态定位E,N和U方向的RMS分别为0.035,0.007和0.080m;动态定位E,N和U方向的RMS分别为0.117,0.122和0.180m。 展开更多
关键词 单频精密单点定位 GRAPHIC观测量 星间差分 正反向滤波 精度分析
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Simulation of fluid-structure interaction in a microchannel using the lattice Boltzmann method and size-dependent beam element on a graphics processing unit 认领 引用 被引量：4
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作者 Vahid Esfahanian Esmaeil Dehdashti Amir Mehdi Dehrouye-Semnani 《Chinese Physics B》 SCIE EI CAS CSCD 2014年第8期389-395,共7页
Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The b... Fluid-structure interaction （FSI） problems in microchannels play a prominent role in many engineering applications. The present study is an effort toward the simulation of flow in microchannel considering FSI. The bottom boundary of the microchannel is simulated by size-dependent beam elements for the finite element method （FEM） based on a modified cou- ple stress theory. The lattice Boltzmann method （LBM） using the D2Q13 LB model is coupled to the FEM in order to solve the fluid part of the FSI problem. Because of the fact that the LBM generally needs only nearest neighbor information, the algorithm is an ideal candidate for parallel computing. The simulations are carried out on graphics processing units （GPUs） using computed unified device architecture （CUDA）. In the present study, the governing equations are non-dimensionalized and the set of dimensionless groups is exhibited to show their effects on micro-beam displacement. The numerical results show that the displacements of the micro-beam predicted by the size-dependent beam element are smaller than those by the classical beam element. 展开更多
关键词 fluid-structure interaction graphics processing unit lattice Boltzmann method size-dependentbeam element
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