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IEEE International Conference on Big Data and Cloud Computing (BdCloud)

作者： Yiyuan Bai Chaokun Wang Xiang Ying Meng Wang Yunqing Gong School of Software Tsinghua University Beijing China Tsinghua National Laboratory for Information Science and Technology Key Laboratory for Information System Security Ministry of Education

ISBN: (纸本)9781479967209

There are plentiful and diverse applications of graph data management and mining in the real-world scientific research and business activities. As one of the most basic operations, uniform path pattern query processing on graph data faces three big challenges. In this paper, we deal with these challenges by the following points. Firstly, a new query language on graph, called G-Path, is presented, which focuses on complex path pattern query processing on a very large graph. Also, the design of a system called HDGL is proposed, which is based on a BSP-like model as well as MapReduce model, and can effectively handle distributed graph data operations and queries. Secondly, the implementation of HDGL on the de facto cloud platform - Hadoop - is brought forward. Based on the concept of distributed state machine, the query processing of a G-Path statement in HDGL is detailed. In addition, as the query optimization of G-Path queries, several tricks are utilized to improve dramatically the performance of query execution. Finally, extensive experiments on several graph data sets are conducted to show the usability of G-Path query language and the effectiveness of HDGL.

关键词： Indexes Query processing Database languages Writing Pattern matching Data models Data mining

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An ultra-low quiescent current output capacitor-less low-dropout regulator with a novel slew-rate-enhanced circuit

An ultra-low quiescent current output capacitor-less low-dro...

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IEEE International Workshop on Radio-Frequency Integration technology (RFIT)

作者： Yang Chen Yizhong Yang Longjie Du Guangjun Xie Xin Cheng Maoxiang Yi School of Electronic Science and Applied Physics Hefei University of Technology Hefei China State Key Lab of ASIC and System Fudan University Shanghai China

This paper presents an ultra-low quiescent current output capacitor-less Low-dropout (LDO) regulator with a novel slew-rate-enhanced (SRE) circuit. By adopting the novel SRE circuit, the transient response of the regulator was improved apparently. Simulation results show that, the LDO regulator consumes a quiescent current of only 930nA at steady state.

关键词： Regulators Transient response Stability analysis Logic gates Circuit stability Simulation Transient analysis

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On Performance of Cache Policies in Named Data Networking

On Performance of Cache Policies in Named Data Networking

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2013 International Conference on Advanced Computer science and Electronics information(ICACSEI 2013)

作者： Jianhua Ran Na Lv Ding Zhang Yuanyuan Ma Zhenyong Xie School of Resource and Environmental Science & Key Laboratory of Geographic Information System of the Ministry of Education Wuhan University School of Information and Electronic Beijing Institute of Technology

Named Data Network (NDN) is gaining increasingly concerns, as an important direction of the future Internet architecture research centered on content. Content caching has played a key role in NDN. Existing cache replacement policies like Least Frequently Used (LFU) and Least Recently Used (LRU) have failed to make full use of the popularity of contents, which leads to a low cache efficiency in the dynamic network. In order to make the best use of content popularity in the cache strategy, this paper has proposed a cache replacement policy based on content popularity (CCP), and designed the data structure format and replacement algorithm. For fully studying and analyzing the performance of different cache policies in NDN in terms of network throughput, server load and cache hit ratio, we have done a lot of simulations to show how they will improve the network. The simulation results show that our proposed CCP can significantly decrease the server load with a higher cache hit ratio and increase the network capacity at the same time compared with LRU and LFU. And the average throughput is reduced significantly by nearly 47% in comparison to that of the case without in-networking caching. Moreover, it also shows the performance under different sizes of content store. The effectiveness of the CCP strategy is proved during the simulation.

关键词： information-Centric Networking, Named-Data Networking, Cache Policy

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Identification of important proteins in protein interaction network based on SVM

Identification of important proteins in protein interaction ...

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International Conference on Machine Tool technology and Mechatronics Engineering, ICMTTME 2014

作者： Zha, Yan Li Luo, Wan Cheng School of Computer Science and Engineering Chongqing University of Technology Chongqing China Vocational Education Center Yongchuan in Chongqing Chongqing China School of Software Engineering Chongqing University of Arts and Sciences Chongqing China Key laboratory of machine vision and intelligent information system of CQWU Chongqing China

ISBN: (纸本)9783038352464

Importance of proteins are different to perform functions of cells in living organisms according to the relevant experiment results, and more essential proteins is the most important kind of proteins. There are recently many computational approaches proposed to predict essential proteins in network level through network topologies combined with biological information of proteins. However it is still hard to identify them because of limitations of topological centralities and bioinformatic sources. And more it is the challenge is to perform better with less resources. Therefore in this paper, we first examine the correlation between common topological centralities and essential proteins and choose a few particular centralities, and then to build a SVM model, names as TC-SVM, for predicting the essential proteins. The new method has been applied to a yeast protein interaction networks, which are obtained from the BioGRID database. The ten folds experimental results show that the performance of predicting essential proteins by TC-SVM is excellent. © (2014) Trans Tech Publications, Switzerland.

关键词： Support vector machines

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LAI estimation of winter wheat using four spectral indices 35

LAI estimation of winter wheat using four spectral indices

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35th Asian Conference on Remote Sensing 2014: Sensing for Reintegration of Societies, ACRS 2014

作者： Yang, Hang Zhang, Lifu Shi, Tingting Jiang, Hailing Tong, Qingxi State Key Laboratory of Remote Sensing Science Institute of Remote Sensing and Digital Earth Chinese Academy of Sciences Beijing100101 China Institute of Remote Sensing and Geographic Information System School of Earth and Space Sciences Peking University Beijing100871 China

ISBN: (纸本)9781634399999

The aim of this paper was to apply spectral index to estimate winter wheat LAI and further to compare prediction accuracy and stability of four proposed typical spectral indices based on four kinds of resampling multispectral and hyperspectral sensors data. The results show that VIUPD has the best prediction accuracy and stability for estimation of winter wheat LAI on the basis of four different resampling sensors data, which reaffirms that VIUPD is comparatively sensor independent and illustrates its potential ability in the area of estimating vegetation biochemical parameters.

关键词： Regression analysis

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Design of a Hardware/Software FPGA-Based Driver system for a Large Area High Resolution CCD Image Sensor

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Photonic Sensors 2014年第3期4卷 274-280页

作者： Ying CHEN Wanpeng XU Rongsheng ZHAO Xiangning Chen Department of Optoelectronics Academy of Equipment Beijing 101416 China State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic InformationUniversity of Electronic Science and Technology of China Chengdu 610054 China 1st Airborne Remote Sensing Department National Remote Sensing Center Beo'ing 100076 China

A hardware/software field programmable gate array （FPGA）-based driver system was proposed and demonstrated for the KAF-39000 large area high resolution charge coupled device （CCD）. The requirements of the KAF-39000 driver system were analyzed. The structure of ＂microprocessor with application specific integrated circuit （asic） chips＂ was implemented to design the driver system. The system test results showed that dual channels of imaging analog data were obtained with a frame rate of 0.87frame/s. The frequencies of horizontal timing and vertical timing were 22.9MHz and 28.7kHz, respectively, which almost reached the theoretical value of 24 MHz and 30kHz, respectively.

关键词： CCD imaging sensor driver system FPGA state machine

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Clause Replication and Reuse in Incremental Temporal Induction

Clause Replication and Reuse in Incremental Temporal Inducti...

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IEEE International Conference on Engineering of Complex Computer systems

作者： Liangze Yin Fei He Ming Gu Jiaguang Sun Key Laboratory for Information System Security Ministry of Education Tsinghua National Laboratory for Information Science and Technology School of Software Tsinghua University Beijing PR China

Temporal induction is one of the most popular SAT-based model checking techniques. It consists of two parts, the base case and the induction step. With the search length increment, both parts generate a sequence of SAT problems. This paper focuses on learnt clause replication and reuse in incremental temporal induction. Firstly, with the aid of assumption literals, we present an alternative clause replication scheme, which is much easier to implement than existing works. Secondly, based on our clause replication scheme, we present several clause reuse schemes to maximally explore the learnt clauses and their replications in temporal induction. Based on above ideas, we propose two new incremental temporal induction algorithms. Experimental results on a large number of benchmarks show significant performance improvement of our technique.

关键词： Model checking Search problems Benchmark testing Safety Databases Laboratories Educational institutions

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A secure self-destruction scheme with IBE for the internet content privacy

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Jisuanji Xuebao/Chinese Journal of Computers 2014年第1期37卷 139-150页

作者： Xiong, Jin-Bo Yao, Zhi-Qiang Ma, Jian-Feng Li, Feng-Hua Liu, Xi-Meng Faculty of Software Fujian Normal University Fuzhou 350108 China School of Computer Science and Technology Xidian University Xi'an 710071 China State Key Laboratory of Information Security Institute of Information Engineering Chinese Academy of Sciences Beijing 100093 China Shaanxi Key Laboratory of Network and System Security Xidian University Xi'an 710071 China

With the rapid emerging of novelty Web services and cloud services, privacy information and documents of users become increasingly easy to be exposed in the Internet. To tackle the issue of lifecycle security of the privacy information and documents in the Internet, in this paper, we propose the idea of combining the three security methods of multilevel security, identity-based encryption (IBE), and distributed hash table (DHT) network. And we further propose an IBE-based secure self-destruction (ISS) scheme to protect the confidentiality and privacy of the Internet content by self-destruction after a predefined time. In our proposed ISS security scheme, the Internet content is first partitioned into many segments with diverse security levels, and each segment is encrypted with a symmetric key to obtain primitive ciphertext. By applying the methods of association and extraction, the primitive ciphertext is turned to associated ciphertext, which is then divided into extracted ciphertext and encapsulated ciphertext. The latter is encapsulated into the Internet content self-destructing object (CDO), which is stored into the storage services provider. Furthermore, to protect the privacy security when the CDO expired, the symmetric key is encrypted using the IBE algorithm based on the identity of the authorized user. The combination of this key's ciphertext and the extracted ciphertext, by means of Lagrange polynomial processing, generates mixture ciphertext shares. Then those shares are distributed into nodes within the DHT network and will be automatically discarded over the deadline when the primitive ciphertext and the symmtric key are unrecoverable. Consequently, the ISS scheme achieves the aim of secure self-destruction. Comprehensive analysis shows that the ISS scheme is able to satisfy all the design demands and is more secure than existing schemes. The ISS scheme can resist against not only the traditional cryptanalysis and brute-force attack, but also the Sybil

关键词： Access control

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Design of dynamic ternary logic using floating-gate MOS transistor

Design of dynamic ternary logic using floating-gate MOS tran...

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International Conference on Solid-state and Integrated Circuit technology

作者： Guoqiang Hang Xiaohua Li Xiaohui Hu State Key Laboratory of ASIC & System Fudan University Shanghai China School of Information & Electrical Engineering Zhejiang University City College Hangzhou China Campus Information Center Zhejiang University Hangzhou China

ISBN: (纸本)9781479932849

A new dynamic circuit scheme to realize voltage-mode ternary circuit using floating-gate MOS (FGMOS) transistor is presented. The dynamic ternary inverter and literal circuits with the less complex structure are designed, and they can be implemented by the standard CMOS process with a double-poly layer without any modification of the thresholds. In the proposed scheme, the circuit output is always brought to logic 1 during the pre-charge phase, to avoid charge sharing in cascaded gates, and then the disadvantage of buffering between stages is eliminated. All the proposed circuits are verified by HSPICE simulation results with TSMC 0.35μm 2-ploy 4-metal CMOS technology.

关键词： Transistors Multivalued logic Abstracts CMOS integrated circuits CMOS technology Logic gates

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An Improved Algorithm for Computing the Area of Union of Circles

An Improved Algorithm for Computing the Area of Union of Cir...

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2014 International Conference on information technology and Management Engineering(ITME 2014)

作者： Xiu-juan LI Jian-xun CHEN School of Computer Science Wuhan University of Science and Technology Hubei Province Key Laboratory of Intelligent Information Processing and Real-time Industrial System

As in computational geometry, CAD/CAM and computer graphics, the basic algorithm of computing of the area of the union of circles is widely used in many fields. In order to solve the problems of judging constraint arcs' direction vaguely and computing some overlap region's area repeatedly on [2], this paper proposes an improved algorithm for computing the area of union of circles. The improved algorithm can calculate united area of circles with distribution at any possible positions, and experimental comparison shows that the algorithm not only solves those problems, but also has more reliability.

关键词： Area of union of circles Computational geometry Constraint arc Computer graphics

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