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片上SDRAM控制器设计与集成

微计算机应用 2005年第5期26卷 571-574页

作者：胡丹李辉张志敏中国科学院计算技术研究所江南大学信息工程学院无锡214036 江南大学信息工程学院

介绍了SDRAM控制器IP核的设计、电路的功能仿真、综合以及验证等过程,其中重点讨论了该控制器的接口设计以实现SoC的集成。性能分析表明该控制器设计合理、性能优异。结果证明了该IP在功能和时序上符合SDRAM控制器技术规范,达到了预定... 详细信息

介绍了SDRAM控制器IP核的设计、电路的功能仿真、综合以及验证等过程,其中重点讨论了该控制器的接口设计以实现SoC的集成。性能分析表明该控制器设计合理、性能优异。结果证明了该IP在功能和时序上符合SDRAM控制器技术规范,达到了预定目标。

关键词： SDRAM控制器接口设计龙芯同步动态存储器片上系统总线接口体系结构

Skyway:Accelerate Graph Applications with a Dual-Path Architecture and Fine-Grained Data Management

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Journal of Computer Science & technology 2024年第4期39卷 871-894页

作者： Mo Zou Ming-Zhe zhang Ru-Jia Wang Xian-He Sun Xiao-Chun Ye Dong-Rui Fan Zhi-Min Tang institute of computing technology Chinese Academy of SciencesBeijing 100190China University of chinese academy of sciences Beijing 100049China institute of Information Engineering Chinese Academy of SciencesBeijing 100045China Department of Computer Science Illinois Institute of TechnologyChicagoIL 60616U.S.A.

Graph processing is a vital component of many AI and big data ***,due to its poor locality and complex data access patterns,graph processing is also a known performance killer of AI and big data *** this work,we propose to enhance graph processing applications by leveraging fine-grained memory access patterns with a dual-path architecture on top of existing software-based graph *** first identify that memory accesses to the offset,edge,and state array have distinct locality and impact on *** then introduce the Skyway architecture,which consists of two primary components:1)a dedicated direct data path between the core and memory to transfer state array elements efficiently,and 2)a data-type aware fine-grained memory-side row buffer hardware for both the newly designed direct data path and the regular memory hierarchy data *** proposed Skyway architecture is able to improve the overall performance by reducing the memory access interference and improving data access efficiency with a minimal *** evaluate Skyway on a set of diverse algorithms using large real-world *** a simulated fourcore system,Skyway improves the performance by 23%on average over the best-performing graph-specialized hardware optimizations.

关键词： graph application computer architecture memory hierarchy

Robust Threshold Guillou-Quisquater Signature Scheme

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Robust Threshold Guillou-Quisquater Signature Scheme

Leakage and wear characteristics of carbon seals for aero-engines

The 1st chinese Conference on Trusted computing and Information Security

作者： WANG Hong. zhang Zhen-feng, FENG Deng-guo State Key Laboratory of Information Security (Graduate School of chinese academy of sciences), beijing 100039, china State Key Laboratory of Information Security (institute of Software of chinese academy of sciences), beijing 100080, china

＜正＞ The deficiencies of the first threshold Guillou-Quisquater signature scheme presented by Li-San Liu, Cheng-Kang Chu and Wen-Guey Tzeng are analysised at first, and then a new threshold Guillou-Quisquater signature scheme is presented. The new scheme is unforgeable and robust against any adaptive adversary if the base Guillou-Quisquater signature scheme is unforgeable under the chosen message attack and computing the discrete logarithm modulo a prime is hard. This scheme can also achieve optimal resilience. However, the new scheme does not need the assumption that N is the product of two safe primes. The basie signature scheme underlyingthe new scheme is exactly Guillou-Quisquater signature scheme, and the additional strong computation assumption introduced by the first threshold Guillou-Quisquater scheme is weaken.

关键词： veriable secret sharing threshold cryptography digital signature scheme robust secure multiparty computation

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chinese Journal of Aeronautics 2022年第11期35卷 389-400页

作者： guoqing LI Shen zhang Zhong KANG Yanfeng zhang Xingen LU Junqiang ZHU institute of Engineering Thermophysics Chinese Academy of SciencesBeijing 100190China School of Aeronautics and Astronautics University of Chinese Academy of SciencesBeijing 100190China School of Energy Power and Mechanical EngineeringNorth China Electric Power UniversityBejing 102206China

Experimental investigation has been performed to study the leakage and wear characteristics of carbon seal working at high circumferential speed. To expand the scope of application, two newly designed carbon seals were compared: #1 Carbon Seal(CS1) with the inner diameter of136 mm and including 4 segments, #2 Carbon Seal(CS2) with the inner diameter of 212 mm and including 6 segments. Air leakage tests were firstly conducted in the Medium-speed Seal Test Rig. The pressure ratio changed from 1.04 to 2.02 with the rotating speed varying from 0 to18300 r/min. Of paramount concern was the durability test, including 300 h running time accumulated by three different working conditions, which was separately implemented on each carbon *** morphology variation of the friction surface, wear and leakage were recorded. Results indicated that the leakage monotonously increases with the pressure ratio and decreases with the rotating speed. Comparing with CS1, more typical features exist on the friction surface of CS2, which are generated by more severe wear. Continually, leakage characteristics deteriorate. Furthermore, fitted formula has been educed for the life prediction of carbon seal, which could provide some supports for aero-engine design.

关键词： Aero-engine Carbon seal Durability test Leakage Rotating Wear

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知识发现在2型糖尿病数据处理中的应用研究

计算机工程与应用 2004年第17期40卷 198-201页

作者：罗森林张铁梅成华曾平陈峰韩怡文北京理工大学北京100081 卫生部北京老年医学研究所北京100730 中科院计算机所北京100080 南京医科大学南京210000

目的:首次将知识发现理论引入到2型糖尿病发病相关因素数据处理中,从大量实测数据中识别出有效的、潜在的、有用的、可理解的发病规律。方法:根据2型糖尿病数据的特点,选用数据挖掘C4.5算法对17072条有效的整群抽样横断面健康调查数据... 详细信息

目的:首次将知识发现理论引入到2型糖尿病发病相关因素数据处理中,从大量实测数据中识别出有效的、潜在的、有用的、可理解的发病规律。方法:根据2型糖尿病数据的特点,选用数据挖掘C4.5算法对17072条有效的整群抽样横断面健康调查数据进行决策树分类。结果:通过训练模型给出糖尿病患病与否的决策分类树,该决策树可以直观地给出发病相关因素的不同层次的相对影响,经实验测试结果对于未患病的正确识别率为92.05%,对于患病的正确识别率为80.90%,同时得出了血糖值为5.85的分类临界值。结论:决策分类树结果同目前认识的高危因素趋于一致,说明数据挖掘C4.5算法适用于2型糖尿病的发病相关因素数据分析处理,是2型糖尿病数据处理的一种新方法,其在疾病的宏观控制中有着广阔的应用前景。

关键词： 2型糖尿病知识发现 C4.5算法数据挖掘

A robust but variable lake expansion on the Tibetan Plateau

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Science Bulletin 2019年第18期64卷 1306-1309页

作者： guoqing zhang Wei Luo Wenfeng Chen Guoxiong Zheng Key Laboratory of Tibetan Environmental Changes and Land Surface Processes.institute of Tibetan Plateau Research Chinese Academy of SciencesBeijing 100101China Center for Excellence in Tibetan Plateau Earth sciences Chinese Academy of SciencesBeijing 100101China Xinjiang institute of Ecology and Geography Chinese Academy of SciencesUrumqi 830011China University of chinese academy of sciences Beijing 100049China

Lakes on the Tibetan Plateau(TP)are an indicator and sentinel of climatic changes[1].We extended lake area changes on the TP from 2010[2]to 2018,and provided a long and dense lake observations between the 1970s and *** found that the number of lakes,with area larger than 1 km2,has in creased to?1,400 in 2018 from?1,000 in the *** total area of these lakes decreased between the 1970s and?1995,and then showed a robust increase,with the exception of a slight decrease in *** expansion of the lakes on the highest plateau in rhe world is a response to a hydrological cycle intensified by recent climate changes[3].

关键词： Plateau Tibetan intensified

Assessment of Slope-Adaptive Metrics of GEDI Waveforms for Estimations of Forest Aboveground Biomass over Mountainous Areas

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Journal of Remote Sensing 2021年第1期2021卷 180-196页

作者： Wenjian Ni Zhiyu zhang guoqing Sun State Key Laboratory of Remote Sensing Science Aerospace Information Research InstituteChinese Academy of SciencesBeijing 100101China University of chinese academy of sciences Beijing 100049China Department of Geographical sciences University of MarylandCollege ParkMD 20742USA

Waveform broadening effects of large-footprint lidar caused by terrain slopes are still a great challenge limiting the estimation accuracy of forest aboveground biomass(AGB)over mountainous ***-adaptive metrics of waveforms were proposed in our previous ***,its validation was limited by the unavailability of enough reference *** study made full validation of slope-adaptive metrics using data acquired by the Global Ecosystem Dynamics Investigation(GEDI)mission,meanwhile exploring GEDI waveforms on estimations of forest *** types of waveform metrics were employed,including slope-adaptive metrics(RHT),typical height metrics relative to ground peaks(RH),and waveform parameters(WP).In addition to terrain slopes,two other factors were also explored including the geolocation issue and signal start and ending points of *** showed that footprint geolocations in the first version GEDI data products were shifted to the left forward of nominal geolocations with a distance of about 24 m~30 m and were substantially corrected in the second version;the fourth and fifth groups of signal start and ending points of waveforms had worse performance than the rest of the four groups because they used the maximum and minimum signal thresholds,*** airborne laser scanner(ALS)data as reference,the root mean square error(RMSE)of terrain slopes extracted from the digital elevation model of the shuttle radar topography mission(SRTM DEM)was about 3°.The coefficients of determination(R^(2))of estimation models of forest AGB based on RH metrics were improved from 0.48 to 0.68 with RMSE decreased from 19.7 Mg/ha to 15.4 Mg/ha by the second version *** RHT and WP metrics gave the best and the worst estimation accuracy,*** further improved R^(2) to 0.77 and decreased RMSE to 13.0 Mg/ha using terrain slopes extracted from SRTM DEM with a resolution of 1 arc second.R^(2) of estimation models based on RHT was finally

关键词： terrain estimation ground

Construction of Resilient Functions

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Construction of Resilient Functions

Gap analysis on open data interconnectivity for disaster risk research

The 1st chinese Conference on Trusted computing and Information Security

作者： zhang Jie, WEN Qiao-yan School of Science, beijing University of Posts and Telecommunications , beijing 100876, china State Key Laboratory of Information Security, chinese academy of sciences, beijing 100039, china

＜正＞ Based on the relationship between nonlinearity and resiliency of a multi-output function, we present a methodfor constructing nonintersecting linear codes from packing design. Through these linear codes, we obtain n-variable, m-output, t-resilient functions with very high nonlinearity. Their nonlinearities are currently the best results for most of

关键词： resilient functions packing design correlation-immune functions linear codes

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Geo-Spatial Information Science 2019年第1期22卷 45-58页

作者： guoqing Li Jing Zhao Virginia Murray Carol Song Lianchong zhang Key Laboratory of Digital Earth Science Institute of Remote Sensing and Digital EarthChinese Academy of SciencesBeijingChina Hainan Key Laboratory of Earth Observation SanyaChina institute of Remote Sensing and Digital Earth University of Chinese Academy of SciencesBeijingChina Public Health England Health and Social CareLondonUK Rosen Centre for Advance computing Purdue UniversityWest LafayetteINUSA

Open data strategies are being adopted in disaster-related data particularly because of the need to provide information on global targets and indicators for implementation of the Sendai Framework for Disaster Risk Reduction 2015–*** all phases of disaster risk management including forecasting,emergency response and post-disaster reconstruction,the need for interconnected multidisciplinary open data for collaborative reporting as well as study and analysis are apparent,in order to determine disaster impact data in timely and reportable *** extraordinary progress in computing and information technology in the past decade,such as broad local and wide-area network connectivity(***),highperformance computing,service and cloud computing,big data methods and mobile devices,provides the technical foundation for connecting open data to support disaster risk research.A new generation of disaster data infrastructure based on interconnected open data is evolving *** are two levels in the conceptual model of Linked Open Data for Global Disaster Risk Research(LODGD)Working Group of the Committee on Data for Science and technology(CODATA),which is the Committee on Data of the International Council for Science(ICSU):data characterization and data *** data characterization,the knowledge about disaster taxonomy and data dependency on disaster events requires specific scientific study as it aims to understand and present the correlation between specific disaster events and scientific data through the integration of literature analysis and semantic knowledge *** connection concepts deal with technical methods to connect distributed data resources identified by data characterization of disaster *** the science community,interconnected open data for disaster risk impact assessment are beginning to influence how disaster data are shared,and this will need to extend data coverage and provide better ways of utilizing data across domains

关键词： Open data interconnectivity gap analysis disaster risk