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Auxiliary stream for optimizing memory access of video decoders

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Science China(Information Sciences) 2014年第1期57卷 41-50页

作者： liu shaoli LI Ling CHEN YunJi HU WeiWu Institute of Computing Technology Chinese Academy of Sciences

Due to the ever increasing resolution and frame rate of mainstream video sequences,memory access has become the main performance bottleneck of video *** reduce the required of-chip memory,many decoders employ on-chip ***,they cannot distinguish whether a data block is reusable due to the lack of the information of undecoded Macro Blocks(MBs),thus often evicting reusable data from the cache and preserving non-reusable data in the cache,which will lead to a waste of of-chip memory *** this paper,we manage to make full use of cache from a novel perspective,i.e.,auxiliary *** speaking,since the memory access behavior of video decoding is determined in video encoding,the encoder can pack the memory access behaviors of video decoding as auxiliary bitstream,which can inform the decoder whether a data block will be reused by future ***,such an auxiliary stream can enable optimal management of *** efectively reduce the size of auxiliary bitstream,we propose an Auxiliary Prior Information Coding(APIC)method complying with the current video *** future video standards,we introduce a Super Block scan Order(SBO)for MB organization to further reduce the bitrate overhead of auxiliary *** above ideas are evaluated on a number of representative video *** additional prior information can reduce the required of-chip memory bandwidth for motion compensation by over 35%(for a 60 kB cache),while only causing less than 2.3%bitrate increase for high definition(HD)videos.

关键词： video decoding video coding memory access motion compensation auxiliary information

Weakly-Supervised Single-view Dense 3D Point Cloud Reconstruction via Differentiable Renderer

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Chinese Journal of Mechanical Engineering 2021年第5期34卷 195-205页

作者： Peng Jin shaoli liu Jianhua liu Hao Huang Linlin Yang Michael Weinmann Reinhard Klein School of Mechanical Engineering Beijing Institute of TechnologyBeijing 100081China Institute of Computer Science II University of Bonn53115 BonnGermany

In recent years,addressing ill-posed problems by leveraging prior knowledge contained in databases on learning techniques has gained much *** this paper,we focus on complete three-dimensional(3D)point cloud reconstruction based on a single red-green-blue(RGB)image,a task that cannot be approached using classical reconstruction *** this purpose,we used an encoder-decoder framework to encode the RGB information in latent space,and to predict the 3D structure of the considered object from different *** individual predictions are combined to yield a common representation that is used in a module combining camera pose estimation and rendering,thereby achieving differentiability with respect to imaging process and the camera pose,and optimization of the two-dimensional prediction error of novel ***,our method allows end-to-end training and does not require supervision based on additional ground-truth(GT)mask annotations or ground-truth camera pose *** evaluation of synthetic and real-world data demonstrates the robustness of our approach to appearance changes and self-occlusions,through outperformance of current state-of-the-art methods in terms of accuracy,density,and model completeness.

关键词： Point clouds reconstruction Differentiable renderer Neural networks Single-view configuration

Stealth-ACK: stealth transmissions of No C acknowledgements

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Science China(Information Sciences) 2017年第9期60卷 21-35页

作者： Jinhua TAO Shi QIU shaoli liu Tianshi CHEN Rui MAO Institute of Computing Technology Chinese Academy of Sciences College of Computer Science and Software Engineering Shenzhen University

Network-on-Chip(No C) is a promising replacement of bus architecture due to its better *** state-of-the-art No Cs, each packet contains several fixed-length flits, which facilitates allocations of network resources but brings in many unused bits. In this paper, we propose a novel technique called Stealth-ACK to effectively address the above problem. Stealth-ACK leverages unused bits in head flits of non-ACK packets to carry and stealthily transmit ACK information. Such stealth transmissions of ACK information effectively reduce not only the amount of dedicated ACK packets on No C, but also the number of unused bits in head flits of non-ACK packets, which significantly reduces wastes on No C bandwidth. Experimental results show that Stealth-ACK averagely increases the throughput of 16 × 16 2-D mesh No C by 11.9%, and averagely reduces the No C latency by 34.8% on application traces of SPLASH-2. Moreover, Stealth-ACK only requires trivial hardware modification to basic router architectures, which incurs negligible power consumption and area cost.

关键词： networks-on-chip acknowledgement packet router architecture optimisation routing algorithm

MW-DLA:a dynamic bit width deep learning accelerator

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High Technology Letters 2020年第2期26卷 145-151页

作者： Li Zhen Zhi Tian liu Enhe liu shaoli Chen Tianshi Intelligent Processor Research Center Institute of Computing TechnologyChinese Academy of SciencesBeijing 100190P.R.China University of Chinese Academy of Sciences Beijing 100049P.R.China Cambricon Technologies Corporation Limited Beijing 100191P.R.China

Deep learning algorithms are the basis of many artificial intelligence *** algorithms are both computationally intensive and memory intensive,making them difficult to deploy on embedded *** various deep learning accelerators(DLAs)are proposed and applied to achieve better performance and lower power ***,most deep learning accelerators are unable to support multiple data *** research proposes the MW-DLA,a deep learning accelerator supporting dynamic configurable *** work analyzes the data distribution of different data types in different layers and trains a typical network with per-layer *** a result,the proposed MW-DLA achieves 2X performance and more than 50%memory requirement for AlexNet with less than 5.77%area overhead.

关键词： deep learning accelerator(DLA) per-layer representation multiple-precision arithmetic unit

Reaction mechanism and chemoselectivity of gold(Ⅰ)-catalyzed cycloaddition of 1-(1-alkynyl) cyclopropyl ketones with nucleophiles to yield substituted furans

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Science China Chemistry 2012年第7期55卷 1413-1420页

作者： YAN YunFeng FANG Ran GENG ZhiYuan WANG YongCheng liu shaoli Gansu Key Laboratory of Polymer Materials College of Chemistry and Chemical EngineeringNorthwest Normal UniversityGansu 730070China College of Chemistry and Chemical Engineering Lanzhou University Gansu 730000China

The mechanisms of gold（I）-catalyzed cycloaddition of 1-（1-alkynyl） cyclopropyl ketones with nucleophiles have been investi- gated using density functional theory calculations at the B3LYP/6-31G （d, p） level of theory. A polarizable continuum model （PCM） has been established in order to evaluate the effects of solvents on the reactions. The results of the calculations indicate that the first step of the catalytic cycle is the cyclization of the carbonyl oxygen onto the triple bond which forms a new and stable resonance structure of an oxonium ion and a carbocation intermediate. The subsequent ring expansion step results in the formation of the final product and regeneration of the catalyst. Furthermore, the regioselectivity and effect of substituents has been discussed, including an analysis of energy, bond length, and natural bond orbital （NBO） charge distributions in the rate-determining step. Our computational results are consistent with earlier experimental observations.

关键词： substituted furans Au(l)-catalyzed regioselectivity substituent effects

Design, Synthesis and Application of a Robust d_(3)-Methyithiolating Reagent

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Chinese Journal of Chemistry 2023年第22期41卷 3045-3049,I0002页

作者： Yanyang Zhang Yishuo Ren Jian Zhang shaoli liu Yahui Li Key Laboratory of Agri-Food Safety of Anhui Province School of Resources and EnvironmentAnhui Agricultural UniversityHefeiAnhui230036China Key Laboratory of Green Pesticide and Agricultural Bio-engineering Ministry of EducationGuizhou UniversityGuiyangGuizhou 550025China Collegeof Chemistry and Chemical Engineering YantaiUniversityYantaiShandong 264005China

A deuterated methylthiolating reagent with a broad spectrum,designated as DMTp,has been ingeniously *** new reagent can be produced with high efficiency through the simple combination of commercially available methyl 3-thiopropanoate and CD_(3)*** novel SCD_(3) reagent exhibits excellent reactivity with electrophiles such as alkyl iodides,benzyl chlorides,aryl halides(l,Br)and aryl triflates,resulting in high levels of deuterium content(99%D).Representative deuterated methylthiolated biomolecules,such as Sulfoxaflor,havebeen synthesizedforuse in pharmaceutical discoveryand development.

关键词： New reagent d_(3)-Methylthiolating reagent Metal-catalyzed Application Aryl halides C1 building blocks Cleavage reactions Organohalides

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基于分割MC算法的超声影像三维重建方法

清华大学学报（自然科学版） 2010年第8期50卷 1214-1218页

作者：刘少丽杨向东陈恳清华大学精密仪器与机械学系摩擦学国家重点实验室北京100084

为了克服传统MC(marching cubes)算法对空间所有体素进行处理时执行效率不高和分割阈值难以确定的缺点,提出了一种基于分割MC算法的超声影像三维重建面绘制方法。它将分割后的超声图像作为分割MC算法的输入,利用分割结果构造等值面,提... 详细信息

为了克服传统MC(marching cubes)算法对空间所有体素进行处理时执行效率不高和分割阈值难以确定的缺点,提出了一种基于分割MC算法的超声影像三维重建面绘制方法。它将分割后的超声图像作为分割MC算法的输入,利用分割结果构造等值面,提高了三维重建的速度和质量。运用可视化开发包(VTK),采用该算法对超声图像的肝脏肿瘤及周围组织器官(血管)进行了三维重建。实验结果表明:采用分割MC算法进行三维重建的速度均在20s以内,精度高,满足临床快速性及高精度要求。该方法已经在肝癌微创治疗中获得成功的临床应用。

关键词：三维重建分割MC(marching cubes)算法可视化工具包(VTK) 面绘制

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肝癌消融医疗机器人的术中风险分析

高技术通讯 2013年第11期23卷 1166-1172页

作者：刘少丽刘检华北京理工大学机械与车辆学院北京100081

针对目前机器人辅助腹腔介入肝癌消融治疗系统术中监测仅靠跟踪二维图像信息进行手术风险判断,缺乏定量信息的问题进行了实时术中风险分析研究,提出了一种有效的术中风险分析算法,其途径是将求取做穿刺运动的消融针与腹腔内重要组织器... 详细信息

针对目前机器人辅助腹腔介入肝癌消融治疗系统术中监测仅靠跟踪二维图像信息进行手术风险判断,缺乏定量信息的问题进行了实时术中风险分析研究,提出了一种有效的术中风险分析算法,其途径是将求取做穿刺运动的消融针与腹腔内重要组织器官之间的最短距离和所对应的时间转化为凸优化问题,并采用内点法对凸优化问题进行求解。仿真实验证明了这种基于内点法的术中风险分析算法的有效性、实时性、通用性。此外,将腹腔环境障碍物以及消融针表示为三阶连续可导隐函数,还可实现多个凸体之间的碰撞监测,为医生监测手术实施有效提供定量的术中风险分析信息。

关键词：凸优化内点法隐函数术中风险分析医疗机器人

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基于自适应基元的导管测量方法

机械工程学报 2021年第22期57卷 71-79页

作者：刘检华黄浩金鹏刘少丽北京理工大学机械与车辆学院北京100081

导管广泛应用于汽车、船舶、航天等领域中,测量加工后导管的空间形态是保证其制造精度和装配可靠性的重要手段。目前,工程中常用的测量方法过于依靠人为操作;近年来兴起的基于计算机视觉的测量方法无法兼顾导管直线段和圆弧段的高效、... 详细信息

导管广泛应用于汽车、船舶、航天等领域中,测量加工后导管的空间形态是保证其制造精度和装配可靠性的重要手段。目前,工程中常用的测量方法过于依靠人为操作;近年来兴起的基于计算机视觉的测量方法无法兼顾导管直线段和圆弧段的高效、精确测量。基于自适应基元导管测量方法的提出,旨在解决导管测量的难题。根据导管的形状特点,将圆柱体作为几何基元,与图像中导管的轮廓匹配对导管初始化重建,并识别直线段和圆弧段;针对圆弧段的测量,用不同长度的基元测量不同弯曲半径的圆弧段,获得相应的测量精度,以此作为训练数据,利用支持向量机(Support vector machine,SVM)建立基元参数预测模型。根据圆弧段不同的弯曲半径,在满足测量精度的前提下,预测长度最长的基元,保证导管直线段和圆弧段的高效、精确测量。

关键词：导管自适应基元视觉测量支持向量机