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Steady state speed distribution analysis for a combined cellular automaton traffic model

Chinese Physics B 2008年第8期17卷 2850-2858页

作者：王俊峰陈桂生刘进 College of Computer Science Sichuan University Institute of Electronic System Engineering State Key Laboratory of Software Engineering Wuhan University

Cellular Automaton （CA） based traffic flow models have been extensively studied due to their effectiveness and simplicity in recent years. This paper develops a discrete time Markov chain （DTMC） analytical framework for a Nagel-Schreckenberg and Fukui Ishibashi combined CA model （W^2H traffic flow model） from microscopic point of view to capture the macroscopic steady state speed distributions. The inter-vehicle spacing Maxkov chain and the steady state speed Markov chain are proved to be irreducible and ergodic. The theoretical speed probability distributions depending on the traffic density and stochastic delay probability are in good accordance with numerical simulations. The derived fundamental diagram of the average speed from theoretical speed distributions is equivalent to the results in the previous work.

关键词： cellular automaton traffic flow model speed distribution discrete time Markov chain

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Physical Implementation of the 1GHz Godson-3 Quad-Core Microprocessor

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Journal of computer Science & Technology 2010年第2期25卷 192-199页

作者：范宝峡杨梁王江嵋王茹肖斌徐英刘动赵继业 Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences Graduate University of Chinese Academy of Sciences Loongson Technology Corporation Limited

The Godson-3A microprocessor is a quad-core version of the scalable Godson-3 multi-core series. It is physically implemented based on the 65 nm CMOS process. This 174 mm2 chip consists of 425 million transistors. The maximum frequency is 1GHz with a maximum power consumption of 15 W. The main challenges of Godson-3A physical implementation include very large scale, high frequency requirement, sub-micron technology effects and aggressive time schedule. This paper describes the design methodology of the physical implementation of Godson-3A, with particular emphasis on design methods for high frequency, clock tree design, power management, and on-chip variation （OCV） issue.

关键词： physical implementation design methodology on-chip variation （OCV） low power clock tree

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Resource Allocation for Multi-Modal Semantic Communication in UAV Collaborative Networks

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IEEE Transactions on Communications 2025年

作者： Hu, Han Zhu, Xingwu Zhou, Fuhui Wu, Wei Hu, Rose Qingyang Zhu, Hongbo Nanjing University of Posts and Telecommunications Jiangsu Key Laboratory of Wireless Communications Nanjing210003 China Nanjing University of Posts and Telecommunications Engineering Research Center of Health Service System Based on Ubiquitous Wireless Networks Ministry of Education Nanjing210003 China Southeast University School of Cyber Science and Engineering Nanjing211189 China Nanjing University of Aeronautics and Astronautics College of Artificial Intelligence Nanjing210000 China Xidian University State Key Laboratory of Integrated Services Networks Xian710071 China Nanjing University of Posts and Telecommunications College of Communication and Information Engineering China Utah State University Department of Electrical and Computer Engineering LoganUT210003 United States

Semantic communication is envisioned as a potential communication paradigm enabled by artificial intelligence and is promising to break the Shannon limit for future 6G networks. This paradigm benefits unmanned aerial vehicles (UAVs) to conserve communication resources and minimize latency by only transmitting task-relevant semantic information. However, resource allocation in the multiple collaborative UAV scenarios remains unexplored, particularly regarding multi-modal semantic communication. To tackle this challenge, this paper investigates a semantic-aware intelligent resource allocation method for multi-UAV-assisted semantic communication networks in the UAV image-sensing task-oriented scenario. A multi-modal semantic communication framework with multi-UAV relay collaboration is developed. At the semantic level, a novel quality of experience (QoE) and the transmission cost model are introduced, based on which a semantic-aware resource allocation problem is formulated, aiming to maximize QoE while minimizing the transmission cost by jointly optimizing the UAV trajectory, the spectrum bandwidth, the transmit power and the number of the transmitted semantic symbols. To deal with optimization challenges involving hybrid variables and coordination among UAVs, a multi-UAV hybrid decision-controlled deep reinforcement learning (DRL) scheme is proposed. Simulation results demonstrate the effectiveness of the proposed scheme compared with the benchmark schemes in achieving a good balance between the QoE and the transmission cost. © 1972-2012 IEEE.

关键词： Deep reinforcement learning

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The effect of core configurations on the energy-absorbing behaviour of all-composite sandwich structures

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Structures 2025年 77卷

作者： Zhang, Wenxin Zhou, Jin Wang, Jizhen Qi, Jiangwei Zheng, Cheng Guan, Zhongwei Cantwell, Wesley J. State key laboratory for manufacturing system engineering School of Mechanical Engineering Xi'an Jiaotong University Xi'an710049 China Department of Naval Architecture Ocean and Structural Engineering School of Transportation Wuhan University of Technology China School of Mechanical Engineering Chengdu University Chengdu610106 China Department of Aerospace Engineering Khalifa University of Science and Technology United Arab Emirates

This paper presents the energy absorption characteristics of all-composite sandwich structures filled with PVC foam subjected to quasi-static and dynamic loading. Compression and drop-weight impact tests have been undertaken to evaluate the mechanical response of sandwich structures made with glass fibre/epoxy (GFRP) and carbon fibre/epoxy (CFRP) corrugation cores embedded with PVC foams. The corrugation core thicknesses are in a range from 0.25 to 1.25 mm, whilst the PVC foams are of a density of 40, 80 and 130 kg/m3, respectively. The energy-absorbing capability is evaluated by determining the specific energy absorption (SEA) of each configuration. The mechanical response of the sandwich structures is also modelled using the finite element method, which is validated against the corresponding experimental data. The relationship between the density of PVC foam and the thickness of corrugation composite is explored via a two-way analysis of variance. The results show that both thick corrugated core and high-density foam contribute to the increase of the compressive strength and specific energy absorption of the structure. However, the structure with the optimal performance is not the structure with the thickest corrugation core and the highest foam density. In contrast, C130 foam-filled CFRP corrugation core with a thickness of 0.75 mm is the most attractive option in terms of specific energy absorption and compression strength. © 2025 Institution of Structural Engineers

关键词： Sandwich structures

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Helix Scan:A Scan Design for Diagnosis

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Tsinghua Science and Technology 2007年第S1期12卷 83-88页

作者：王飞胡瑜李晓维 Graduate School of Chinese Academy of Sciences Key Laboratory of Computer System and Architecture Institute of Computing TechnologyChinese Academy of Sciences

Scan design is a widely used design-for-testability technique to improve test quality and efficiency. For the scan-designed circuit, test and diagnosis of the scan chain and the circuit is an important process for silicon debug and yield learning. However, conventional scan designs and diagnosis methods abort the subsequent diagnosis process after diagnosing the scan chain if the scan chain is faulty. In this work, we propose a design-for-diagnosis scan strategy called helix scan and a diagnosis algorithm to address this issue. Unlike previous proposed methods, helix scan has the capability to carry on the diagnosis process without losing information when the scan chain is faulty. What is more, it simplifies scan chain diagnosis and achieves high diagnostic resolution as well as accuracy. Experimental results demonstrate the effectiveness of our design.

关键词： test diagnosis scan chain diagnosis design for diagnosis (DFD)

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Effectiveness Evaluation for Clinical Depression Detection Using Deep Learning Based Synthetic House-Tree-Person Test

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IEEE Journal of Biomedical and Health Informatics 2025年 PP卷 PP页

作者： Chen, Zhuolong Yin, Xiaoqing Yang, Fan Li, Xiaofan Zhao, Zixuan Li, Xueying Liu, Jianghu Zhao, Yubin Xu, Cheng-Zhong Zheng, Fangfang Lin, Yong Sun Yat-Sen University School of Microelectronics Science and Technology 0000 China The Fifth Affiliated Hospital of Sun Yat-Sen University Department of Psychiatry 0000 China The Fifth Affiliated Hospital of Sun Yat-Sen University Pediatrics Department 0000 China Jinan University School of Intelligent System Science and Engineering 0000 China University of Macau State Key Laboratory of IoTSC Department of Computer and Information Science Macau0000 China

Depression is one of the most common mood disorders and the number of patients increases significantly in recent years. Due to the lack of biomarkers, conversation between patients and psychiatrists is still the main clinical diagnostic method which is easily influenced by subjectivity of both patients and psychiatrists. Synthetic House-tree-person test (S-HTP), a convenient and efficient mental assessment tool, minimizes subjective influences from patients, while its effectiveness is limited by the professional ability of analyst. Here we introduce a deep learning model DeHTP, a flexible and convenient depression detection method based on S-HTP without interaction between people. Experimental results demonstrate that DeHTP achieves 0.963 AUC and 0.9 accuracy, and outperforms the conventional manual analysis of S-HTP, which is conducted on the guideline of 50 conclusions from previous study related to depression. In addition, it reveals 22 depression-correlated drawing features aligned with conclusions above from the perspective of our proposed model. Leveraging the advantages of deep learning and S-HTP, this approach has the potential for widespread promotion and adoption as the available tool for daily self-mental monitoring, as well as the promising auxiliary diagnostic method in clinical. © 2013 IEEE.

关键词： Contrastive Learning

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Two-decadal shifts in phytoplankton functional taxa (2002–2022) in response to extreme marine heatwaves

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Optics Express 2025年第10期33卷 21961-21978页

作者： Ronglong Chen Deyong Sun Shengqiang Wang Yongjun Jia Muhammad Bilal Shuyan Lang Zhenghao Li State Key Laboratory of Climate System Prediction and Risk Management Nanjing University of Information Science and Technology Nanjing 210044 China School of Marine Sciences Nanjing University of Information Science and Technology Nanjing 210044 China Key Laboratory of Space Ocean Remote Sensing and Application Ministry of Natural Resources Beijing 100081 China National Satellite Ocean Application Service Beijing 100081 China Architecture and City Design Department College of Design and Built Environment King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia Interdisciplinary Research Center for Aviation & Space Exploration (IRC-ASE) King Fahd University of Petroleum and Minerals (KFUPM) Dhahran 31261 Saudi Arabia

Phytoplankton play a crucial role in the primary productivity of ocean ecosystems, rendering changes in their populations particularly consequential. The effects of extreme sea surface temperature (SST) on phytoplankton are noteworthy. However, the direct characterization of total biomass by chlorophyll for analysis is inaccurate for phytoplankton functional taxa (PFTs) with different sensitivity to SST. Through the method of Diagnostic pigment analysis (DPA), these organisms can be classified into six primary functional taxa based on their distinctive pigments, which play a vital role in elucidating their ecological functions and dynamics. This study employed optical remote sensing to reconstruct daily concentrations and occupancy of six PFTs in the Eastern China Marginal Sea (ECMS) over the past 20 years. Causal analyses were conducted to identify regions with varying sensitivity to SST changes and further explore the corresponding impacts on phytoplankton concentrations. Results revealed that high-causality areas in the Bohai Sea (BS) and Yellow Sea (YS) were primarily located in nearshore waters. In contrast, high-causality regions in the East China Sea (ECS) were farther offshore, while nearshore areas exhibited lower causality. The high-causality subregions experienced significant fluctuations in phytoplankton concentrations, particularly during marine heatwave (MHW) events, with a prevailing trend of decline in taxon concentrations driven by elevated SST. In comparison, low-causality subregions displayed weaker synchronization with SST changes, as other factors influenced taxa concentrations more prominently. Notably, while phytoplankton concentrations fluctuated significantly during extreme MHW events, they eventually reverted to baseline levels. However, with the increasing frequency and intensity of MHWs due to global warming, the capacity for phytoplankton to recover under such repeated stress remains uncertain. This study emphasizes the necessity of furt

关键词： Absorption coefficient Optical absorption Optical properties Remote sensing Spatial resolution Strain

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Design and implementation of communication system of the Dawning 6000 supercomputer

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中国计算机科学前沿 2010年第4期4卷 466-474页

作者： Qiang LI Bo LI Zhigang HUO Ninghui SUN National Research Center for Intelligent Computing Systems Beijing 100190China Key Laboratory of Computer System and Architecture Chinese Academy of SciencesBeijing 100190China Graduate University of Chinese Academy of Sciences Beijing 100190China National Research Center for Intelligent Computing Systems Beijing 100190China Key Laboratory of Computer System and Architecture Chinese Academy of SciencesBeijing 100190China

An increasing number of supercomputers adopt a heterogeneous architecture, consisting of both general purpose CPUs and specialized accelerators. Such design is beneficial for scalability and power, but on the other hand, heterogeneity brings new challenges in communication systems to connect heterogeneous components and provide support for programming. The communication system of the Dawning 6000 connectstwo kinds of heterogeneous processors, Loongson and AMD, and adopts a three layer architecture with an intranode layer between heterogeneous components. To efficiently connect heterogeneous components, the system forms a global address space and provides a mechanism for message transmission via an in-node global store; and employing Infiniband network, provides an OS-bypassing virtualization method to share an Infiniband card between nodes. To facilitate programming on heterogeneous processors, it supports unified parallel C (UPC), with a modified complier based on global address space. Also, aspecial collective network is implemented for collective operations. Results obtained from a prototype system prove these features to be both feasible and efficient.

关键词： hyper parallel processing (HPP) global address space (GAS) virtualization Dawning 6000 unified parallel C (UPC)

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Missile aerodynamic design using reinforcement learning and transfer learning

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Science China(Information Sciences) 2018年第11期61卷 253-255页

作者： Xinghui YAN Jihong ZHU Minchi KUANG Xiangyang WANG Department of Computer Science and Technology Tsinghua University State Key Laboratory of Intelligent Technology and System Tsinghua University

Dear editor,Aerodynamic design is usually a time-consuming process of four steps [1]. First, an initial design profile is obtained with designer’s domain knowledge. Second, the design profile is represented as a CAD model using softwares such as Catia or ***, a CAE software, such as ICEM or Hypermesh, is applied to generate corresponding *** last, a computational fluid dynamics (CFD)software, such as Fluent or CFX, is used to calculate the performance. Therefore, only numbered

关键词： II Missile aerodynamic design using reinforcement learning and transfer learning Figure

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An Elastic architecture Adaptable to Various Application Scenarios

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Journal of computer Science & Technology 2014年第2期29卷 227-238页

作者：伍岳陈云霁陈天石郭崎张磊 State Key Laboratory of Computer Architecture Institute of Computing TechnologyChinese Academy of Sciences University of Chinese Academy of Sciences IBM Research-China

The quantity of computer applications is increasing dramatically as the computer industry prospers. Meanwhile, even for one application, it has different requirements of performance and power in different scenarios. Although various processors with different architectures emerge to fit for the various applications in different scenarios, it is impossible to design a dedicated processor to meet all the requirements. Furthermore, dealing with uncertain processors significantly aggravates the burden of programmers and system integrators to achieve specific performance/power. In this paper, we propose elastic architecture （EA） to provide a uniform computing platform with high elasticity, i.e., the ratio of worst-case to best-case performance/power/performance-power trade-off, which can meet different requirements for different applications. It is achieved by dynamically adjusting architecture parameters （instruction set, branch predictor, data path, memory hierarchy, concurrency, status^zcontrol, and so on） on demand. The elasticity of our prototype implementation of EA, as Sim-EA, ranges from 3.31 to 14.34, with 5.41 in arithmetic average, for SPEC CPU2000 benchmark suites, which provides great flexibility to fulfill the different performance and power requirements in different scenarios. Moreover, Sim-EA can reduce the EDP （energy-delay product） for 31.14% in arithmetic average compared with a baseline fixed architecture. Besides, some subsequent experiments indicate a negative correlation between application intervals＇ lengths and their elasticities.

关键词： architecture design configurable elasticity energy-delay product reduction

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