检索结果-内蒙古大学图书馆

A new private-preserving algorithm based on SMART

Journal of Computers (Taiwan) 2016年第4期27卷 171-185页

作者： Han, Bowen Zhang, Zhenjiang Uden, Lorna School of Electronic and Information Engineering Key Laboratory of Communication and Information Systems Beijing Jiaotong University Beijing100044 China School of Software Engineering Key Laboratory of Communication and Information Systems Beijing Jiaotong University Beijing100044 China School of Computing FACS Staffordshire University The Octagon Beaconside StaffordSt180AD United Kingdom

Privacy is a critical issue in many WSN applications because wireless sensor networks (WSNs) are vulnerable to malicious attacks due to their characteristics. Existing hop by hop and shuffling based privacy preserving protocols does not provide an energy efficient, accurate and secure data aggregation because of the energy consuming decryption at the aggregator node. How to provide effective privacy-preserving algorithm during data aggregation is important. Our main aim is to provide an energy efficient and secure data aggregation scheme, which guarantees the privacy, authenticity and freshness of individual sensed data as well as the confidentiality, accuracy and integrity of aggregated data. This paper improved on the limitations of the SMART (Slice-Mix-AggRegaTe) algorithm, and proposes a new privacy protection algorithm for wireless sensor network (WSN). We have different operations between different nodes, bring in probabilistic segmentation, and also add the data coefficient as well as the positive and negative factors. In addition we also consider making exchange time random in the algorithm. Simulation results demonstrate that the proposed algorithm reduces the communication consumption and the data traffic, improves the precision of data aggregation and the degree of privacy-preserving to a certain extent. © 2016, Computer Society of the Republic of China. All rights reserved.

关键词： Aggregates

来源：评论

学校读者我要写书评

暂无评论

Confining Wi-Fi Coverage: A Crowdsourced Method Using Physical Layer Information

Confining Wi-Fi Coverage: A Crowdsourced Method Using Physic...

引用

IEEE communications Society Conference on Sensor and Ad Hoc communications and Networks (SECON)

作者： Bingxian Lu Zhicheng Zeng Lei Wang Brian Peck Daji Qiao Michael Segal Key Laboratory for Ubiquitous Network and Service Software of Liaoning Province School of Software Dalian University of Technology China Department of Electrical and Computer Engineering Iowa State University USA Communication Systems Engineering Department Ben-Gurion University of the Negev Israel

ISBN: (纸本)9781509017331

Many small businesses and public areas offer free Wi-Fi access, but may wish to restrict network access only to their customers or patrons inside the physical property. Unfortunately, due to the nature of wireless networks, this is difficult to accomplish. We develop and implement CLAC, a Crowdsourced Location aware Access Control scheme using physical layer information to address this challenge. It crowdsources both channel state information (CSI) and received signal strength (RSS) of already validated users to classify future users. We propose and use two CSI metrics in CLAC: CSI Cross-Antenna Stability Metric and CSI Cross-Frame Stability Metric, which summarize well the spatial and temporal CSI characteristics respectively. CLAC is evaluated in an office and a classroom. Evaluation results show that CLAC performs well in both environments, allowing most valid users inside the area to access the network, while the chance that invalid users outside the boundary may access the network is small.

关键词： Training Antennas IEEE 802.11 Standard Monitoring Measurement Signal to noise ratio Indexes

来源：评论

学校读者我要写书评

暂无评论

Speaker recognition with mel scale-based wavelet packet decomposition and AR-volterra model

引用

ICIC Express Letters, Part B: Applications 2016年第10期7卷 2087-2094页

作者： Yang, Shuying Guo, Jijn Jiang, Jiaojiao School of Computer and Communication Engineering Tianjin University of Technology No. 391 Binshui Xidao Xiqing District Tianjin300384 China Tianjin Key Laboratory of Intelligence Computing and Novel Software Technology No. 391 Binshui Xidao Xiqing District Tianjin300384 China

In order to improve the rate of speaker recognition, this paper proposes a new scheme with Mel scale-based Wavelet Packet Decomposition and AR-Volterra model. First, the speech signal is decomposed by wavelet packet of Mel scale, and calculate energy spectrum of the sub-band signals. The sub-bands of low energy are discarded according to weighting the proportion ofenergy for all-bands. Second, chaos ofsub-band signals are determined by the largest Lyapunov exponent. Ifsub-band is chaotic, Volterra adaptive model will be used to extract features. Otherwise, the autoregressive model will be used to extract features. Third, linear and nonlinear characteristic parameters will be used to speaker recognition. Hidden Markov model is used to recognize speaker. The experimental results show the extracted features have been obviously improved. © 2016 ICIC International.

关键词： Hidden Markov models

来源：评论

学校读者我要写书评

暂无评论

Interactive reflection simulation via physical shading model and fast environment mapping

引用

ICIC Express Letters, Part B: Applications 2016年第2期7卷 351-356页

作者： Xu, Jie Fu, Jinhua School of Software Zhengzhou University of Light Industry China School of Computer and Communication Engineering Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou Information Science and Technology Institute Zhengzhou China

In order to enhance realistic reflection effects on some objects and realize faster rendering to meet interactive requirements, we present a novel method to produce interactive reflection simulation using physical shading model and fast environment mapping. The physical shading model could efficiently express ambient lighting, specular lighting and diffuse lighting. Also the model is based on the microfacet distribution function, which can describe physics-based characteristics. Fast environment mapping is realized by Spherical Harmonics (SH) transformation, and the rendering equation can be rewritten as a simple dot product of SH coefficients, which fits for GPU (Graphics Processing Unit) computation. The results show that we can realize faster rendering and acquire realistic reflection effects such as glossy and mapping scene on the surface. © 2016 ICIC International.

关键词： Lighting

来源：评论

学校读者我要写书评

暂无评论

Automatic salient object segmentation via shape prior based active contour model

引用

ICIC Express Letters, Part B: Applications 2016年第11期7卷 2491-2496页

作者： Gao, Shangbing Zhang, Youdong Zhou, Jun Zheng, Hao The Key Laboratory for Traffic and Transportation Security of Jiangsu Province Faculty of Computer and Software Engineering No. 1 Meicheng Rd. Huai’an223003 China Jiangsu Provincial Key Laboratory for Advanced Manufacturing Technology Huaiyin Institute of Technology No. 1 Meicheng Rd. Huai’an223003 China Key Laboratory of Trusted Cloud Computing and Big Data Analysis Nanjing Xiaozhuang University No. 3601 Hongjing Ave. Jiangning Dist. Nanjing211171 China

In this paper, we propose a novel model for unsupervised segmentation of viewer's attention object from natural images based on localizing region-based active con-tour (LRAC). Firstly, we proposed the saliency detection model via the multi-scale super-pixel. Then, object-level shape prior is extracted combining saliency with object boundary information. Finally, this contour is improved by the edge-preserving to generate the initial contour for our automatic object segmentation system. In contrast with localiz-ing region-based active contours that require considerable user interaction, the proposed method does not require it, i.e., the segmentation task is ful_lled in a fully automatic manner. Extensive experiments results on a large variety of natural images demonstrate that our algorithm consistently outperforms the popular existing salient object segmenta-tion methods, yielding higher precision and better recall rates. © 2016 ICIC International.

关键词： Image segmentation

来源：评论

学校读者我要写书评

暂无评论

Performance optimization and evaluation of space management in cloud storage systems 15th

Performance optimization and evaluation of space management ...

引用

15th International Conference on Algorithms and Architectures for Parallel Processing, ICA3PP 2015

作者： Xu, Guangping Li, Huan Mao, Qunfang Lin, Sheng Zhang, Hua Tianjin Key Laboratory of Intelligence Computing and New Software Technology Tianjin300384 China Computer and Communication Engineering School Tianjin University of Technology Tianjin300384 China

ISBN: (纸本)9783319271392

Cloud service providers and enterprises usually deploy high performance storage to manage the unrelenting growth of data. In this paper, we focus on performance optimization and evaluation by using optimal regeneration codes in such cloud storage systems. We present an efficient data maintenance management framework to reduce network repair traffic with the minimum data movement while keeping the desired fault-tolerance in storage systems. In the management framework, it has two phases including the traditional erasure coding process and the optimal placement process. We formally represent the optimal placement as a variant of the bin packing problem by bipartite graphs. Then, we model the placement transform by the interchange graph and propose an efficient heuristic algorithm to find the optimal solution. All feasible solutions are linked together by interchange operation and thus the search space can be taken as an interchange graph. Finally, we evaluate the performance of the optimal placement during data maintenance with different practical settings in our experiments. The experimental results show that the amount of network repair traffic can be reduced by about 10% than the initial placement and by about 2X than traditional erasure coding placement. © Springer International Publishing Switzerland 2015.

关键词： Heuristic algorithms

来源：评论

学校读者我要写书评

暂无评论

Deadline constrained cloud computing resources scheduling for cost optimization based on dynamic objective genetic algorithm

Deadline constrained cloud computing resources scheduling fo...

引用

IEEE Congress on Evolutionary Computation, CEC 2015

作者： Chen, Zong-Gan Du, Ke-Jing Zhan, Zhi-Hui Zhang, Jun Department of Computer Science Sun Yat-Sen University Guangzhou510275 China School of Advanced Computing Sun Yat-Sen University Guangzhou510275 China Key Laboratory of Machine Intelligence and Advanced Computing Ministry of Education China Engineering Research Center of Supercomputing Engineering Software Ministry of Education China Key Laboratory of Software Technology Department of Guangdong Province China

ISBN: (纸本)9781479974924

Cloud computing resources scheduling is significant for executing the workflows in cloud platform because it relates to both the execution time and execution cost. In order to take both the time and cost into consideration, Rodriguez and Buyya have proposed a cost-minimization and deadline-constrained workflow scheduling model on cloud computing. Their model has great applicability but the solution of their particle swarm optimization (PSO) approach is not good enough and cannot meet a tight deadline condition. In this paper, we propose a genetic algorithm (GA) approach to solve this model. In order to tackle with the tight deadline condition, a dynamic objective strategy is further proposed to let GA focus on optimize the execution time objective to meet the deadline constraint when the feasible solution hasn't been obtained. After obtaining a feasible solution, the GA focuses on optimizing the execution cost within the deadline constraint. Therefore, the proposed dynamic objective GA (DOGA) has adaptive ability to the search environment to different objectives. We have conduct extensive experiments based on workflows with different scales and different cloud resources. Experimental results show that DOGA can find better solution with smaller cost than PSO does on different scheduling scales and different deadline conditions. DOGA approach is more applicable to be used in commercial activities. © 2015 IEEE.

关键词： Genetic algorithms

来源：评论

学校读者我要写书评

暂无评论

A fine-grained algorithm for generating hard-toreverse negative databases

A fine-grained algorithm for generating hard-toreverse negat...

引用

International Workshop on Artificial Immune Systems, AIS 2015

作者： Zhao, Dongdong Luo, Wenjian Liu, Ran Yue, Lihua School of Computer Science and Technology University of Science and Technology of China Hefei Anhui230027 China Anhui Province Key Laboratory of Software Engineering in Computing and Communication University of Science and Technology of China Hefei Anhui230027 China School of Computer Science China University of Geosciences Wuhan430074 China

ISBN: (纸本)9781509002986

The negative database (NDB) is a new technique for privacy preserving and information hiding. It hides information by storing the complementary set instead of the original data. In order to protect the hidden information, NDBs should be hard-to-reverse. In this paper, we propose the Khidden algorithm for generating hard-to-reverse NDBs (called Khidden-NDBs). The K-hidden algorithm could be controlled in a more fine-grained manner than existing NDB generation algorithms. Moreover, in terms of the SAT solvers based on the local search strategy, we formally prove that the K-hidden-NDBs could be more hard-to-reverse than the NDBs generated by the typical p-hidden algorithm. Furthermore, we show that the Khidden-NDB could be more hard-to-reverse (against the local search strategy) than the q-hidden-NDB (NDBs generated by the q-hidden algorithm) when the sizes of NDBs are the same. Finally, as for the Unit Clause heuristic solvers, we prove that the K-hidden-NDB could be the same hard-to-reverse as the qhidden-NDB. © 2015 IEEE.

关键词： Database systems

来源：评论

学校读者我要写书评

暂无评论

GPU-based simulation of ocean water using fluid dynamics model and displacement mapping

引用

ICIC Express Letters 2016年第6期10卷 1239-1245页

作者： Xu, Jie Fu, Jinhua Zhang, Hongtao School of Software Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou450002 China State Key Laboratory of Mathematical Engineering and Advanced Computing Zhengzhou450002 China School of Computer and Communication Engineering Zhengzhou University of Light Industry No. 5 Dongfeng Road Zhengzhou450002 China College of Information Engineering Zhengzhou University No. 100 Kexue Ave. Zhengzhou450000 China

Real-time realistic simulation of liquids like ocean water is an important task nowadays in the field of computer graphics. In this paper, we present a novel method to achieve plausible visual results of ocean water at higher rendering rates. Based on evolution of the density and the velocity, we establish the fluid dynamics model to express properties of the fluid and simulate ocean water efficiently. Also we implement the displacement mapping by utilizing the heightmap and design the shading shader on the GPU (Graphics Processing Unit), which gives a realistic appearance in higher rendering speed. The results show that we can acquire realistic rendering effects such as water color, light reflection, caustics and soft shadow, while achieving a relatively faster speed of rendering. © 2016 ISSN.

关键词： Graphics processing unit

来源：评论

学校读者我要写书评

暂无评论

Resource allocation for scalable video streaming in highway VANET

Resource allocation for scalable video streaming in highway ...

引用

International Conference on Wireless communications and Signal Processing (WCSP)

作者： Yang Xu Hao Zhou Xiaoyan Wang Baohua Zhao Province Key Laboratory of Software in Computing and Communication Hefei China School of Science and Technology University of Science and Technology of China Hefei China National Institute of Informatics Tokyo Japan

ISBN: (纸本)9781467376884

In vehicular ad-hoc network (VANET), the popular video transmission service can serve people with live traffic information, real-time news or even high-definition movies, which can assist people to drive on the road and enhance their driving experience. In this paper, we propose a dynamic programming based algorithm for the resource allocation problem of scalable video streaming through long term evolution (LTE) networks in highway VANET. We manage vehicular mobility by using small group of pictures (GOP) sized scalable video coding (SVC) encoder and valid signal-to-interference-and-noise ratio (SINR) estimator. We also adopt adaptive receive window of GOP to enhance the resource utilization efficiency as well as video quality. The simulation results demonstrate the efficiency of the proposed algorithm.

关键词： Streaming media Resource management Vehicular ad hoc networks Signal to noise ratio Interference Road transportation Static VAr compensators

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：