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Real-Time H.265/HEVC Intra Encoding with a Configurable Architecture on FPGA Platform

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Chinese Journal of Electronics 2019年第5期28卷 1008-1017页

作者： DING Dandan WANG Silong LIU Zoe yuan qingshu School of Information Science and Engineering Hangzhou Normal University College of Information Science and Electronic Engineering Zhejiang University

This paper proposes a flexible design scheme for H.265/HEVC encoding based on FPGA, which allows an easy incorporation of a variety of algorithms applied to different scenarios. In particular, we present an H.265/HEVC intra encoder as an instantiation of our proposed scheme. The key idea is to develop an encoder system by configuring basic Processing elements(PEs) of fundamental algorithms. Our intra encoder using the flexible framework is structured with fourstage CTU based pipeline. Pixel-level PEs are designed to unify the intra prediction of 35 modes and a multiscale compatible transform array is proposed to process variable size transform. 32 PEs are paralleled for intra mode decision to support 35 combinations of modes and partitions. In the reconstruction stage, 16 PEs are paralleled for intra prediction and a 16 × 16 multiplier array is configured for transforms of variable sizes with a constant 16 pixels/cycle throughput. Implementation results show that our proposed architecture costs about63 K Lookup tables and 62 KB on-chip memories on Xilinx Kintex-7 platform with the maximum working frequency at 175 MHz, which is sufficient for real-time encoding of 1920 × 1080 @60 fps video at 160 MHz. The flexibility and extension capability of our framework provides a great potential for future FPGA solutions serving for different purposes.

关键词： H.265/HEVC Configuration Flexibility Intra prediction FPGA

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"凹"字方言白读考

方言 2005年第2期27卷 182-185页

作者：袁庆述湖南师范大学中文系长沙410081

本文考索"凹"字的方言白读[ua]类音在古代和近代文献中的表现,并试图探讨其来源。

关键词： “凹”字方言白读汉语

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受限资源网络环境的协同虚拟环境感知模型

计算机辅助设计与图形学学报 2005年第7期17卷 1600-1606页

作者：袁庆曙鲁东明胡益锋潘云鹤浙江大学计算机科学与技术学院杭州310027

AM-COVEN感知模型依据人的行为和感知特征,综合考虑位置、兴趣区、感知等级、感知QoS、感知相关性等问题,描述了受限资源网络环境下的虚拟环境的感知问题,为网络资源的合理应用提供支持·实验证明,AM-COVEN能缓解网络条件对感知的影响·

关键词：计算机支持协同工作协同虚拟环境感知感知模型

The origin and evolution of Earth's nitrogen

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National Science Review 2024年第6期11卷 56-75页

作者： yuan Li State Key Laboratory of Isotope Geochemistry Guangzhou Institute of GeochemistryChinese Academy of Sciences Bayerisches Geoinstitut Universit?t Bayreuth

Nitrogen is a vital element for life on Earth. Its cycling between the surface(atmosphere + crust) and the mantle has a profound influence on the atmosphere and climate. However, our understanding of the origin and evolution of Earth's nitrogen is still incomplete. This review presents an overview of the current understanding of Earth's nitrogen budget and the isotope composition of different reservoirs, laboratory constraints on deep nitrogen geochemistry, and our understanding of the origin of Earth's nitrogen and the deep nitrogen cycle through plate subduction and volcanism. The Earth may have acquired its nitrogen heterogeneously during the main accretion phase, initially from reduced, enstatite-chondrite-like impactors,and subsequently from increasingly oxidized impactors and minimal CI-chondrite-like materials. Like Earth's surface, the mantle and core are also significant nitrogen reservoirs. The nitrogen abundance and isotope composition of these three reservoirs may have been fundamentally established during the main accretion phase and have been insignificantly modified afterwards by the deep nitrogen cycle, although there is a net nitrogen ingassing into Earth's mantle in modern subduction zones. However, it is estimated that the early atmosphere of Earth may have contained ～1.4 times the present-day atmospheric nitrogen(PAN),with ～0.4 PAN being sequestered into the crust via biotic nitrogen fixation. In order to gain a better understanding of the origin and evolution of Earth's nitrogen, directions for future research are suggested.

关键词： nitrogen isotopes silicate Earth atmosphere magma ocean

Robustness of the octupole collectivity in 144Ba within the cranking covariant density functional theory in 3D lattice

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Nuclear Science and Techniques 2024年第8期35卷 124-131页

作者： Ze‑Kai Li yuan‑yuan Wang Mathematics and Physics Department North China Electric Power UniversityBeijing 102206China Hebei Key Laboratory of Physics and Energy Technology North China Electric Power UniversityBaoding 071000China

The octupole deformation and collectivity in octupole double-magic nucleus 144Ba are investigated using the Cranking covariant density functional theory in a three-dimensional lattice *** reduced B(E3)transition probability is implemented for the first time in semiclassical approximation based on the microscopically calculated electric octupole *** available data,including the I-ωrelation and electric transitional probabilities B(E2)and B(E3)are well ***,it is shown that the ground state of 144Ba exhibits axial octupole and quadrupole deformations that persist up to high spins(I≈24h).

关键词： Octupole collectivity Cranking covariant density functional theory Rotational spectrum Electric transitional probabilities

面向实物交互的空间增强现实数字孪生法配准技术

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计算机辅助设计与图形学学报 2021年第5期33卷 655-661页

作者：潘志庚高嘉利王若楠袁庆曙范然佘莉杭州师范大学阿里巴巴商学院杭州311121 杭州师范大学信息科学与工程学院杭州311121

在支持实物交互的空间增强现实系统中,交互会引起实物对象方向、位置的快速改变.为了确保实物移动过程中的虚实配准实时性和精确性,提出一种面向实物交互的空间增强现实数字孪生法配准技术.通过在数字空间建立与物理空间一致的对象数字... 详细信息

在支持实物交互的空间增强现实系统中,交互会引起实物对象方向、位置的快速改变.为了确保实物移动过程中的虚实配准实时性和精确性,提出一种面向实物交互的空间增强现实数字孪生法配准技术.通过在数字空间建立与物理空间一致的对象数字模型,实时捕获物理空间中对象的方向、位置信息,利用该信息实时调整数字空间中的虚拟对象方向、位置参数;离线标定投影机的内外部参数,同时在数字空间中建立与物理空间中投影机内外部参数一致的虚拟相机,将实时渲染生成的数字图像输出至投影画面,从而实现虚实图像的精确配准.使用搭建的投影式交互桌面开展中学物理认识磁感线实验,交互过程中磁铁、指南针的检测与配准结果表明,该技术具有很好的配准实时性和精度,能够满足空间增强现实系统中的实物交互需求.

关键词：空间增强现实投影着色虚实配准实物交互

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文化遗产数字化展示与互动技术研究与进展

浙江大学学报（理学版） 2020年第3期47卷 261-273页

作者：潘志庚袁庆曙陈胜男张明敏杭州师范大学VR与智能系统研究院浙江杭州311121 浙江大学计算机科学与技术学院浙江杭州310027

以计算机图形学、虚拟现实(VR)、增强现实(AR)、计算机动画等技术为支撑的数字文化遗产技术,为数字化记录、保存、展示和利用文化遗产提供了丰富的手段。结合笔者所在课题组近20 a在数字文化遗产方面的工作,对文化遗产数字化展示与互动... 详细信息

以计算机图形学、虚拟现实(VR)、增强现实(AR)、计算机动画等技术为支撑的数字文化遗产技术,为数字化记录、保存、展示和利用文化遗产提供了丰富的手段。结合笔者所在课题组近20 a在数字文化遗产方面的工作,对文化遗产数字化展示与互动技术的国内外发展现状进行了综述,对其中的关键技术,包括数字化建模、数字化呈现和人机互动进行了深入讨论,并介绍了笔者在京杭大运河虚拟漫游系统和清明上河图动画与互动系统实现中的经验。最后,讨论了面临的挑战和发展趋势。

关键词： VR AR 数字文化遗产人机交互京杭大运河清明上河图互动

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支持自然交互的虚拟跑步机系统的设计和实现

系统仿真学报 2017年第11期29卷 2753-2759页

作者：潘志庚刘从晋葛莹莹袁庆曙杭州师范大学数字媒体与人机交互研究中心杭州311121 吉林动画学院长春130012

虚拟跑步机系统通过虚拟呈现户外运动场景,提高了跑步机的趣味性。如何在跑步过程中实现人机的自然、有效交互是系统设计中需要考虑的重要问题。基于Kinect体感设备,通过对手势交互区域的合理划分及分析,设计了一种手势交互协议,该协议... 详细信息

虚拟跑步机系统通过虚拟呈现户外运动场景,提高了跑步机的趣味性。如何在跑步过程中实现人机的自然、有效交互是系统设计中需要考虑的重要问题。基于Kinect体感设备,通过对手势交互区域的合理划分及分析,设计了一种手势交互协议,该协议在不中断跑步过程的前提下,实现了跑步机系统的菜单交互、内容切换等交互功能。开发了一套虚拟跑步机系统,利用OSG三维图形库和Unity3D引擎搭建三维虚拟场景,并运用串口及Socket通信实现跑步机状态数据、虚拟人运动数据的实时传输,最终通过大屏幕或投影呈现虚拟运动场景。实验表明,本文设计的虚拟跑步机系统能有效提升跑步机系统的交互友好性、易用性与趣味性。

关键词：跑步机自然交互 Kinect OSG

Collective Molecular Machines: Multidimensionality and Reconfigurability

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Nano-Micro Letters 2024年第8期16卷 309-340页

作者： Bin Wang yuan Lu Department of Chemical Engineering Tsinghua UniversityBeijing 100084People’s Republic of China Key Laboratory of Industrial Biocatalysis Ministry of EducationTsinghua UniversityBeijing 100084People’s Republic of China

Molecular machines are key to cellular activity where they are involved in converting chemical and light energy into efficient mechanical *** the last 60 years,designing molecular structures capable of generating unidirectional mechanical motion at the nanoscale has been the topic of intense *** progress has been made,attributed to advances in various fields such as supramolecular chemistry,biology and nanotechnology,and ***,individual molecular machines are only capable of producing nanometer work and generally have only a single *** order to address these problems,collective behaviors realized by integrating several or more of these individual mechanical units in space and time have become a new *** this review,we comprehensively discuss recent developments in the collective behaviors of molecular *** particular,collective behavior is divided into two *** is the appropriate integration of molecular machines to efficiently amplify molecular motions and deformations to construct novel functional *** other is the construction of swarming modes at the supramolecular level to perform nanoscale or microscale *** discuss design strategies for both modes and focus on the modulation of features and ***,in order to address existing challenges,the idea of transferring experience gained in the field of micro/nano robotics is presented,offering prospects for future developments in the collective behavior of molecular machines.

关键词： Molecular machines Collective control Collective behaviors DNA Biomolecular motors