检索结果-内蒙古大学图书馆

2014 IEEE 5th International Conference on Software Engineering and Service Science

作者： Chenqi Bao Alexander Flueck Jianmin Bao Xuan Shen Computer of Engineering Illinois Institute of Technology (College of IOTNanjing University of Posts and Telecommunications)Ministry of Education Key Lab of Broadband Wireless Communication and Sensor Network Technology (College of IOT Nanjing University of Posts and Telecommunications)Ministry of Education

Visualization is critical in power systems engineering since the gigantic amount of data generated by power systems is difficult,and at times impossible,to be analyzed numerically. Therefore,the need for powerful visualization software has been increasingly acute due to the growth in size of power system models. To improve PPV’s performance in order to accompany larger systems,this paper focuses on the development of PPV (Perfect Power Visualization),a 2-D power system visualization software program that processes and conver ts numerical data to graphic symbols based on their types,positions and states. The goal of PPV is to let operators visualize and interact with large-scale power systems in a consumer lever personal computer in real time. Also,it was optimized again with smarter data management systems,refinement of overall structure,and a newer platform that enables GPU acceleration,all of which further increased the performance of PPV by a factor of ten times that of its initial capabilities.

关键词： PPV,Power System Visualization,Java FX,GPU acceleration,Performance Optimization

来源：评论

学校读者我要写书评

暂无评论

Low-power task scheduling algorithm for large-scale cloud data centers

引用

Journal of Systems Engineering and Electronics 2013年第5期24卷 870-878页

作者： Xiaolong Xu Jiaxing Wu Geng Yang Ruchuan Wang College of Computer Nanjing University of Posts and Telecommunications State Key Laboratory for Novel Software Technology Nanjing University Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications

How to effectively reduce the energy consumption of large-scale data centers is a key issue in cloud computing. This paper presents a novel low-power task scheduling algorithm （L3SA） for large-scale cloud data centers. The winner tree is introduced to make the data nodes as the leaf nodes of the tree and the final winner on the purpose of reducing energy consumption is selected. The complexity of large-scale cloud data centers is fully consider, and the task comparson coefficient is defined to make task scheduling strategy more reasonable. Experiments and performance analysis show that the proposed algorithm can effectively improve the node utilization, and reduce the overall power consumption of the cloud data center.

关键词： cloud computing data center task scheduling energy consumption.

来源：评论

学校读者我要写书评

暂无评论

Impact of MAC frame length on energy efficiency in 6LowPAN

引用

The Journal of China Universities of Posts and Telecommunications 2013年第4期20卷 67-72页

作者： CHEN Shou-ning YANG Long-xiang ZHAO Yu-juan LI Jing Key Laboratory of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Jiangsu Mobile Communication Company Limited Nanjing Branch

To reach necessary end-to-end connectivity between the Internet and wireless sensor networks （WSNs）, the Internet Engineering Task Force （IETF） IPv6 over low power wireless personal area network （6LowPAN） working group has been established and introduced an adaptation layer for integration of IEEE 802.15.4 physical layer/media access control （PHY/MAC） layers and the upper layers of any Intemet protocol （IP）-based networks, such as the Internet. The energy efficiency is one of the most important performance measures in WSNs because most sensor nodes are only battery powered so we should reduce the energy consumption to the lowest to extend the life of nodes. Therefore the determination of MAC frame length should be carefully considered since that the radio frequency （RF） module consumes most the energy of a sensor node meanwhile the MAC protocol is the direct controller of RF module. In this paper, we provide a star-shaped 6LowPAN non-beacon mode with unslotted carrier sense multiple access with collision avoidance （CSMA/CA） mechanism to access to the channel and model the stochastic behavior of a target end node as the M/G/1 queuing system. Analytical expressions for some parameters such as channel busy probability, packet loss probability and energy efficiency are obtained in this paper and our analytical results can clearly show the impact of MAC frame length on the energy efficiency of a target node in both ideal and lossy channel.

关键词： 6LowPAN IEEE 802.15.4 unslotted CSMA/CA M/G/1 queuing system MAC frame length energy efficiency

来源：评论

学校读者我要写书评

暂无评论

Secure P2P topology based on a multidimensional DHT space mapping

引用

Science China(Information Sciences) 2013年第5期56卷 224-237页

作者： SUN ZhiXin LUO BingQing CHEN YaDang BU Kai Key Laboratory of Broadband Wireless Communication and Sensor Network Technology(Nanjing University of Posts and Telecommunications) Ministry of Education State Key Laboratory for Novel Software Technology Nanjing University

Distributed search and routing algorithms based on the DHT(distributed hash table) protocol have attracted considerable attention in structured P2P(peer-to-peer) research as a result of favorable properties such as distribution,self-organization,and high *** with a traditional C/S(client/server) network,the probability of peers initiating malicious behavior increases dramatically because of their self-governing and dynamic characteristics,which also make it harder to satisfy the peers’ security required by *** this paper,we propose a new secure DHT protocol based on a multidimensional mapping *** mechanism maps peers to a multidimensional space by dividing the identifiers into ***,a series of secure methods and routing algorithms are provided to achieve secure DHT in smaller *** with state-ofthe-art approaches,the theoretical analysis and experimental results show that the multidimensional mapping mechanism can effectively improve the average success rate of a resource search by inhibiting malicious behavior.

关键词： multidimensional mapping DHT(distributed hash table) structured P2P(peer-to-peer) network routing attack security

来源：评论

学校读者我要写书评

暂无评论

Study on Object Transaction Based on networked RFID Systems

Study on Object Transaction Based on Networked RFID Systems

引用

2014 IEEE 5th International Conference on Software Engineering and Service Science

作者： Xuan Shen Chenqi Bao Jianmin Bao Huan Wang Department of Computer and Software Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of EducationCollege of IOT Nanjing University of Posts and Telecommunications Department of IOT Nanjing University of Posts and Telecommunications

ISBN: (纸本)9781479932801

Radio Frequency IDentification(RFID) is a novel technology of automated *** use of RFID,however,raises great concerns due to the serious security *** this paper,we at first propose a Secure Transaction Frame(STF) and a flow of object transaction based on networked RFID ***,it is worth mentioning that the authentication technology in Secure Transaction Frame(STF) is able to verify the ownership of electric tags in order to deal with common attacks in the networked RFID ***,this paper presents an encryption scheme to protect the information stored in electric tags from being illegally *** collecting relevant statistics and analyzing cases based on networked RFID systems,this paper also researches the mass requests for the information stored in the electric tags by the reader and eventually,gives a cache mechanism to solve that problem.

关键词： RFID object transaction secure transaction flow(STF) mass requests cache technology

来源：评论

学校读者我要写书评

暂无评论

Poster: Secret key generation from CFR for OFDM TDD systems over fading channels

Poster: Secret key generation from CFR for OFDM TDD systems ...

引用

International Conference on communications and networking in China (CHINACOM)

作者： Yuexing Peng George C. Alexandropoulos Peng Wang Yonghui Li Dac-Binh Ha Key Lab of Universal Wireless Communication Beijing University of Posts and Telecommunications Beijing China Broadband Wireless and Sensor Network Group Athens Information Technology Peania Greece Centre of Excellence in Telecommunications University of Sydney Sydney Australia Institute of Research and Development Duy Tan University Danang Vietnam

One of the basic problems in cryptography is the generation of a common secret key between two legitimate parties in order to prevent eavesdropping. In this paper, we develop an information-theoretic secret key generation method that exploits the physical layer properties of the multipath channel in orthogonal frequency division multiplexing (OFDM) systems with time division duplexing (TDD), and in particular the amplitude and phase of the estimated channel frequency response (CFR). Both the fast space decorrelation and the independency of the amplitude and phase of the multipath fading channel are used to generate the secret key, leading to increased secrecy bit rate and negligible secrecy leakage. The effect of the channel estimation error, delay and mobility are investigated for the presented method. Simulation results corroborate the increased performance of the proposed method over existing ones.

关键词： wireless communication Security OFDM Fading communication system security Indexes Channel estimation

来源：评论

学校读者我要写书评

暂无评论

Sparse and low-rank matrices recovery from incomplete and noisy measurement

引用

Journal of Computational Information Systems 2013年第19期9卷 7703-7710页

作者： Yang, Zhenzhen Yang, Zhen College of Communication and Information Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

The problem of recovering sparse and low-rank matrices from a given matrix captures many applications. However, this recovery problem is NP-hard and thus not tractable in general. Recently, it has been shown that this NP-hard problem can be well approached via heuristically solving a convex relaxation problem where the ?1-norm and the nuclear norm are used to induce sparse and low-rank structures, respectively. To capture more applications, this paper studies the recovery problem in a more general setting: the matrix is acquired by compressed measurement and the measurement is corrupted by Gaussian noise. The separable structure of the new model enables us to solve the involved subproblems more efficiently by splitting the multipliers function. Hence, an implementable numerical algorithm which called accelerated alternating direction method of multipliers (AADMM) is proposed to solve the novel model. Our experimental results show that AADMM is surprisingly efficient for solving the new recovery model. © 2013 Binary Information Press.

关键词： Recovery

来源：评论

学校读者我要写书评

暂无评论

JOINT LLR-CRC ERROR MITIGATION FOR TWO-WAY ADAPTIVE DENOISE-AND-FORWARD network CODING

引用

Journal of Electronics(China) 2013年第4期30卷 352-361页

作者： Cheng Yulun Yang Longxiang Jiangsu Key Lab of Wireless Communications Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications

network Coding (NC) brings correlation between the coded signals from different sources, which makes the system more vulnerable to the decode error at relay. Conventional Cyclic Redundancy Code (CRC) has been implemented for error bit detection. However, its error correction is simply ignored. To fully exploit this feature, this paper proposes a novel joint Log-Likelihood Ratio (LLR) CRC error mitigation for NC two way relay channel. Specific thresholds are designed to estimate the error number of data block and identify those which can be recovered if the number is within the error correction scope of CRC. We examine two modes of the thresholds, one based on the average Bit Error Rate (BER) of source-relay link, while the other based on that of instantaneous one. We provide the full analysis for the Pair-wise Error Probability (PEP) performance of the scheme. A variety of numerical results are presented to reveal the superiority of the proposed scheme to conventional CRC NC under independent Rayleigh fading channels. Moreover, the efficiencies of the proposed thresholds are also validated.

关键词： network Coding （NC） Log-Likelihood Ratio （LLR） Cyclic Redundancy Code （CRC） Denoise-and-forward Pair-wise Error Probability （PEP）

来源：评论

学校读者我要写书评

暂无评论

Efficient electronic entanglement concentration assisted by single mobile electrons

引用

Chinese Physics B 2013年第11期22卷 178-182页

作者：盛宇波周澜 Institute of Signal Processing Transmission Nanjing University of Posts and Telecommunications Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education College of Mathematics & Physics Nanjing University of Posts and Telecommunications

We present an efficient entanglement concentration protocol （ECP） for mobile electrons with charge detection. This protocol is quite different from other ECPs for one can obtain a maximally entangled pair from a pair of less-entangled state and a single mobile electron with a certain probability. With the help of charge detection, it can be repeated to reach a higher success probability. It also does not need to know the coefficient of the original less-entangled states. All these advantages may make this protocol useful in current distributed quantum information processing.

关键词： quantum communication entanglement entanglement concentration

来源：评论

学校读者我要写书评

暂无评论

First-order-reflection MIMO channel model for 60 GHz NLOS indoor WLAN systems

First-order-reflection MIMO channel model for 60 GHz NLOS in...

引用

International Conference on communication Systems

作者： Lei Wang Jianxin Chen Xin Wei Jingwu Cui Baoyu Zheng National Mobile Comm. Research Laboratory Southeast University Nanjing China Ministry of Education Key Lab of Broadband Wireless Comm. and Sensor Network Technology (Nanjing University of Posts & Telecomm.) Nanjing China

ISBN: (纸本)9781479958337

wireless communications employing 60 GHz millimeter wave are quite attractive recently due to the huge clean unlicensed bandwidth (up to 7 GHz) in this frequency band. In this paper, aiming at increasing channel capacity and improving the reliability of non-line-of-sight (NLOS) indoor wireless communications, we focus on a first-order-reflection multiple input multiple output (MIMO) model for 60 GHz wireless local area network (WLAN) systems based on the short-range indoor scenario provided by IEEE Std 802.11ad. Considering the special physical properties of 60 GHz millimeter wave in such scenario, we use large scale planar antenna arrays at both transmitter and receiver to eliminate link level interference. The antenna arrays are divided into several sub-arrays and each sub-array is considered as a high-gain steerable directional antenna unit. The essential characteristics of the physical layer of this model is to adjust these antenna units along different first-order-reflection clusters from walls or ceiling simultaneously at both transmitter and receiver to get several parallel channel links. System level simulation results demonstrate that the proposed model with multiple first-order-reflection links can increase the channel capacity for several times compared to the original model in this scenario.

关键词： MIMO Antenna arrays Signal to noise ratio wireless communication Interference IEEE standards Receivers

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：