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一种新的H.264变长编码方法

计算机工程与应用 2005年第30期41卷 38-39,51页

作者：郭建军戴葵成运王志英国防科技大学计算机学院长沙410073

新一代视频压缩标准H.264中采用了统一变长编码(UVLC)。该文分析了几种在统一变长编码基础上的工作之后,提出了一种新的变长编码方法,并对其进行了测试。实验结果表明:在基本相同的峰值信噪比(PSNR)下,采用新的变长编码方法后的码率比... 详细信息

新一代视频压缩标准H.264中采用了统一变长编码(UVLC)。该文分析了几种在统一变长编码基础上的工作之后,提出了一种新的变长编码方法,并对其进行了测试。实验结果表明:在基本相同的峰值信噪比(PSNR)下,采用新的变长编码方法后的码率比标准编码方法节省了3.1%～11.7%。

关键词：视频压缩 H.264 变长编码

Transient thermo-mechanical analysis for bimorph soft robot based on thermally responsive liquid crystal elastomers

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Applied Mathematics and Mechanics(English Edition) 2019年第7期40卷 943-952页

作者： yun CUI Yafei YIN Chengjun wang K. SIM Yuhang LI Cunjiang YU Jizhou SONG Institute of Solid Mechanics Beihang University Beijing 100191 China Department of engineering Mechanics Soft Matter Research Center Key Laboratory of Soft Machines and Smart Devices of Zhejiang Province Zhejiang University Hangzhou 310027 China Materials science and engineering Program University of Houston Houston TX 77204 U. S.A. State Key Laboratory of Strength and Vibration of Mechanical Structures School of Aerospace Engineering Xi’an Jiaotong University Xi’an 710049 China Department of Mechanical engineering University of Houston Houston TX 77204 U. S.A. Department of Electrical and computer engineering University of Houston Houston TX 77204 U. S.A. Department of Biomedical engineering Texas Center for Superconductivity University of Houston Houston TX 77204 U. S.A.

Thermally responsive liquid crystal elastomers (LCEs) hold great promise in applications of soft robots and actuators because of the induced size and shape change with temperature. Experiments have successfully demonstrated that the LCE based bimorphs can be effective soft robots once integrated with soft sensors and thermal actuators. Here, we present an analytical transient thermo-mechanical model for a bimorph structure based soft robot, which consists of a strip of LCE and a thermal inert polymer actuated by an ultra-thin stretchable open-mesh shaped heater to mimic the unique locomotion behaviors of an inchworm. The coupled mechanical and thermal analysis based on the thermo-mechanical theory is carried out to underpin the transient bending behavior, and a systematic understanding is therefore achieved. The key analytical results reveal that the thickness and the modulus ratio of the LCE and the inert polymer layer dominate the transient bending deformation. The analytical results will not only render fundamental understanding of the actuation of bimorph structures, but also facilitate the rational design of soft robotics.

关键词： transient thermo-mechanical analysis soft robot thermal-responsive liq- uid crystal elastomer (LCE)

Self-adaptive resource allocation for cloud-based software services based on progressive QoS prediction model

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science China(Information sciences) 2019年第11期62卷 192-194页

作者： Xing CHEN Junxin LIN yun MA Bing LIN Haijiang wang Gang HUANG College of Mathematics and computer science Fuzhou University Fujian Key Laboratory of Network Computing and Intelligent Information Processing Fuzhou University school of Software Tsinghua University College of Physics and Energy Fujian Normal University Key Laboratory of High Confidence Software Technologies Ministry of Education

Dear editor,Self-adaptation is a promising approach to allocate resources for cloud-based software services [1, 2].Traditional self-adaptive resource-allocation methods are rule-driven, which leads to high administrat... 详细信息

关键词： service Self-adaptive resource allocation for cloud-based software services based on progressive QoS prediction model

Smart all-time vision:The battery-free video communication for urban administration and law enforcement

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Digital Communications and Networks 2023年第6期9卷 1411-1420页

作者： Yajie He Chonghui Xiao Shuai wang yun-Hao Liu Zhaoyuan Xu Haoquan Zhou Min Zhao Wei Gong China university of Political science and Law Beijing 100088China National computer Network Emergency Response Technical Team/Coordination Center of China(CNCERT/CC) Beijing 100029China school of Information and Electronics Beijing Institute of TechnologyBeijing 100081China university of science and Technology of China Hefei 230026China The First Affiliated Hospital of USTC Hefei 230026China The First Affiliated Hospital of Guangxi Medical university Nanning 530005China

The Chinese government is dedicated to enhancing the level of informatization in administrative law enforcement to ensure fairness and increase ***,law enforcement has exposed such problems as insufficient force,difficulties in collecting evidence,and low evidential *** problems contradict the principles of rule of law and *** local governments have implemented advanced information technologies for urban administration and law enforcement,including big data,artificial intelligence,and *** these technologies,IoT is the core communication infrastructure for innovative law enforcement ***,traditional video communications rely on batteries or dedicated power sources,leading to maintenance challenges and high power *** this paper,we propose AT-Eye,a new video communication paradigm for all-time law enforcement video monitoring,which is battery-free and *** key enabler of AT-Eye is ambient backscatter technology,which enables energy harvesting and video communication *** previous methods,our proposal introduces a novel CCK-based modulation for tag cameras and achieves 4-way *** modulation is simple because it uses phase difference and it is energyefficient because generating square waves is ***,to ensure full compatibility with COTS WiFi,we modulate the physical service data ***,data recovery is possible using only commercial *** conduct comprehensive experiments to examine our proposal and experiment results show that AT-Eye achieves a throughput of 10.8 Mbps with COTS *** also simulate a 16-way battery-free tag camera system,demonstrating AT-Eye’s feasibility of high-definition video communication.

关键词： Video communication Backscatter communication Internet-of-Things Smart law enforcement

PIPBQ Effect Aware SER Analysis for Combinational Logic Circuits

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Journal of Electronic science and Technology 2016年第1期14卷 60-67页

作者： Ai-Bin Yan Hua-Guo Liang Zheng-Feng Huang Zhi wang Cui-yun Jiang the school of computer and Information Hefei University of Technology the school of Electronic science & Applied Physics Hefei University of Technology the school of Mathematics Hefei University of Technology

Technology scaling results in the propagation-induced pulse broadening and quenching（PIPBQ） effect become more *** order to effectively evaluate the soft error rate for combinational logic circuits,a soft error rate analysis approach considering the PIPBQ effect is *** different original pulse propagating through logic gate cells,pulse broadening and quenching are measured by *** that,electrical effect look-up tables（EELUTs） for logic gate cells are created to evaluate the PIPBQ *** paths are accurately retrieved by the proposed re-convergence aware sensitized path search ***,by propagating pulses on these paths to simulate fault injection,the PIPBQ effect on these paths can be quantified by *** a result,the soft error rate of circuits can be effectively computed by the proposed *** results verify the soft error rate improvement comparing with the PIPBQ-not-aware method.

关键词： Pulse broadening and quenching effect re-convergence single event transient soft error rate

A transformer generative adversarial network for multi-track music generation

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CAAI Transactions on Intelligence Technology 2022年第3期7卷 369-380页

作者： Cong Jin Tao wang Xiaobing Li Chu Jie Jiessie Tie yun Tie Shan Liu Ming Yan Yongzhi Li Junxian wang Shenze Huang school of Information and Communication engineering Communication University of ChinaBeijingChina school of Information and engineering Zhengzhou UniversityZhengzhouChina Central Conservatory of Music BeijingChina Department of computer science University of TorontoTorontoCanada school of Data science and Media Intelligence Communication University of ChinaBeijingChina school of Light Industry and engineering South China University of TechnologyGuangzhouChina school of Animation and Digital Arts Communication University of ChinaBeijingChina

This study proposes a new generation network based on transformers and guided by the music theory to produce high-quality music *** this study,the decoding block of the transformer is used to learn the internal information of single-track music,and cross-track transformers are used to learn the information amongst the tracks of different musical instruments.A reward network based on the music theory is proposed,which optimizes the global and local loss objective functions while training and discriminating the network so that the reward network can provide a reliable adjustment method for the generation of the *** method of combining the reward network and cross entropy loss is used to guide the training of the generator and produce high-quality music *** with other multi-track music generation models,the experimental results verify the validity of the model.

关键词： artificial intelligence deep learning multimedia

Numerical Prediction and Analysis of Hydraulic Characteristics of Waterfall Scene for Application to Design Control

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Transactions of Tianjin university 2017年第3期23卷 277-288页

作者： Chao wang Sherong Zhang yun Li Guojin Zhu Bohui Pang Xiaofang Zheng State Key Laboratory of Hydraulic engineering Simulation and Safety Tianjin UniversityTianjin 300072China school of Civil engineering Tianjin UniversityTianjin 300072China State Key Laboratory of Hydrology-Water Resources and Hydraulic engineering Hohai UniversityNanjing 210098China HYDROCHINA Kunming engineering Corporation Kunming 650051China

The hydraulic characteristics of artificial waterfalls constitute an important research area for both academia and industry. As yet, the hydraulic parameters used in the hydraulic design of landscape waterfalls are not well understood for use in qualitative and quantitative analyses. Due to their complicated shapes and appearances, it remains a challenging problem to design or simulate realistic waterfall scenes. In this paper, we present a hybrid model and an efficient numerical method for simulating the hydraulic characteristics of waterfalls and investigate the critical flow in waterfall design and the adherent flow phenomenon. We fit empirical equations to predict the size and shape of different waterfall flow patterns to provide a basis for the design and construction of waterscapes in the real world. We then apply our work to an artificial waterfall in Kraal Jiang River and the results demonstrate that our model achieves desirable control qualities and good agreement in a real-world application. © 2017, Tianjin university and Springer-Verlag Berlin Heidelberg.

关键词： Buoyancy computer simulation Numerical methods Quality control

Total curvature(TC) model and its alternating direction method of multipliers algorithm for noise removal

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Optoelectronics Letters 2019年第3期15卷 217-223页

作者： MU yun-ping HUANG Bao-xiang wang Yu-xi wang Ming-lei XUE Chao school of computer science Qingdao University

This paper develops a variational model for image noise removal using total curvature(TC), which is a high-order regularizer. The TC has the advantage of preserving image feature. Unfortunately, it also has the characteristics of nonlinear, non-convex and non-smooth. Consequently, the numerical computation with the curvature regularization is difficult. In order to conquer the computation problem, the proposed model is transformed into an alternating optimization problem by importing auxiliary variables. Furthermore, based on alternating direction method of multipliers, we design a fast numerical approximation iterative scheme for proposed model. Finally, numerous experiments are implemented to indicate the advantages of the proposed model in image edge preserving, image contrast and corners preserving. Meanwhile, the high computational efficiency of the designed model is verified by comparing with traditional models, including the total variation(TV) and total Laplace(TL) model.

关键词： Total curvature model and its alternating direction method of multipliers algorithm for noise removal TC TV

engineering microparticles based on solidified stem cell secretome with an augmented pro-angiogenic factor portfolio for therapeutic angiogenesis

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Bioactive Materials 2022年第11期7卷 526-541页

作者： Thomas Spater Marisa Assunçao Kwok Keung Lit Guidong Gong Xiaoling wang Yi-yun Chen Ying Rao Yucong Li Chi Him Kendrick Yiu Matthias W.Laschke Michael D.Menger Dan wang Rocky S.Tuan Kay-Hooi Khoo Michael Raghunath junling Guo Anna Blocki Institute for Clinical&Experimental Surgery Saarland UniversityHomburgSaarGermany school of Biomedical sciences Faculty of MedicineThe Chinese University of Hong KongShatinNew TerritoriesHong KongChina Institute for Tissue engineering and Regenerative Medicine The Chinese University of Hong KongShatinNew TerritoriesHong KongChina BMI Center for Biomass Materials and Nanointerfaces College of Biomass Science and EngineeringSichuan UniversityChengduSichuan610065China Bioproducts Institute Departments of Chemical and Biological EngineeringThe University of British ColumbiaVancouverBCCanada Academia Sinica Common Mass Spectrometry Facilities for Proteomics and Protein Modification Analysis and Institute of Biological ChemistryAcademia SinicaNankangTaipeiChina Shun Hing Institute of Advanced engineering(SHIAE) Faculty of EngineeringThe Chinese University of Hong KongShatinNew TerritoriesHong KongChina Ministry of Education Key Laboratory for Regenerative Medicine School of Biomedical SciencesThe Chinese University of Hong KongShatinNew TerritoriesHong KongChina Department of Orthopaedics&Traumatology The Chinese University of Hong KongShatinNew TerritoriesHong KongHong Kong Special Administrative Region of China Institute for Chemistry and Biotechnology Zurich University of Applied SciencesWadenswilSwitzerland State Key Laboratory of Polymer Materials engineering Sichuan UniversityChengduSichuan610065China

Tissue (re)vascularization strategies face various challenges, as therapeutic cells do not survive long enough in situ, while the administration of pro-angiogenic factors is hampered by fast clearance and insufficient ability to emulate complex spatiotemporal signaling. Here, we propose to address these limitations by engineering a functional biomaterial capable of capturing and concentrating the pro-angiogenic activities of mesenchymal stem cells (MSCs). In particular, dextran sulfate, a high molecular weight sulfated glucose polymer, supplemented to MSC cul-tures, interacts with MSC-derived extracellular matrix (ECM) components and facilitates their co-assembly and accumulation in the pericellular space. Upon decellularization, the resulting dextran sulfate-ECM hybrid material can be processed into MIcroparticles of SOlidified Secretome (MIPSOS). The insoluble format of MIPSOS protects protein components from degradation, while facilitating their sustained release. Proteomic analysis demonstrates that MIPSOS are highly enriched in pro-angiogenic factors, resulting in an enhanced pro-angiogenic bioactivity when compared to naïve MSC-derived ECM (cECM). Consequently, intravital microscopy of full-thickness skin wounds treated with MIPSOS demonstrates accelerated revascularization and healing, far superior to the ther-apeutic potential of cECM. Hence, the microparticle-based solidified stem cell secretome provides a promising platform to address major limitations of current therapeutic angiogenesis approaches.

关键词： Dextran sulfate Extracellular matrix Mesenchymal stem cells Therapeutic angiogenesis Wound healing Poly-electrolyte-driven co-assembly