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A strategy for fault management in LDC wireless sensor network

Computer Modelling and New Technologies 2014年第8期18卷 158-163页

作者： Yang, Jian College of Computer Nanjing University of Posts and Telecommunications Nanjing Jiangsu China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Nanjing Jiangsu China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing Jiangsu China

With rapid development of hardware, wireless sensor networks (WSN) have been applied in a wide range of fields. However, energy cost constrains putting WSN into use. To reduce energy cost, extending life time, WSN in low-duty-cycle (LDC) draws researchers' attention. In general, work time of a node only occupies 0.1%-10% in a cycle. This model certainly reduces the energy for idle listening. On the other hand, it makes the probability of congestion very high due to a node that can only receive packets when waking up. This paper proposes a new LDCWSN model to solve the congestion from duty schedule. With the model, we show a strategy for WSN fault averting, diagnosing and recovery based on congestion in nodes. We include some attributes of LDC WSN in our strategy, i.e. probability of congestion, scheduler, and link quality. By improving the selection of nodes on every level, we get a low rate for network's fault appearance, low E2E delay and long lifetime. The simulation's result shows that our strategy has a better performance in packet loss, energy cost and time delay than proposed WSN fault management.

关键词： sensor nodes

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The research on joint distributed source coding and network coding for wireless multicast network

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Journal of Computational Information Systems 2013年第3期9卷 1147-1156页

作者： Liu, Ying Yang, Zhen Mei, Zhonghui Kong, Yuanyuan Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing 210003 China

This paper considers the problem of transmitting correlated information from multiple sources to multiple receivers, where every receiver seeks to recover all of the original sources. In order to improve the efficiency of network transmission, we combine interflow network coding and distributed source coding using syndromes (DISCUS). Furthermore, for wireless multicast multi-hop network, we propose an adaptive transmission algorithm with target of minimum energy consumption based on the above practical joint scheme. The simulation results verify the validation of theoretical results in the paper. Copyright © 2013 Binary Information Press.

关键词： network coding

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The method of gaze tracking based on iris detection

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International Journal of Information and communication technology 2013年第3-4期5卷 234-242页

作者： Zhang, Deng-Yin Wang, Zhou-Yang Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

This paper presents a new method of gaze tracking based on iris detection for images of human eyes captured by ordinary PC camera. In the basis of traditional iris detection, this paper improves the circle detection based on Hough transform by self-adopted angle step and in order to overcome the impact of light spot and noise, and presents the algorithm of interference-points elimination. The position user focus on screen is detected by comparing to the conference position after accurately calculating the centre pixel of pupil iris area. The proposed method is significant to the optimisation of network services and applications by apperceiving user experience (UE) through analysis sight movement sample of network user. Experimental results demonstrate the feasibility, the correct rate is 92%, 86% in 6×4, 8×6 screen block dividing respectively under normal circumstances. © 2013 Inderscience Enterprises Ltd.

关键词： Eye tracking

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Domain-epidemic spray and forward routing algorithm of opportunistic networks

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International Journal of Information and communication technology 2013年第3-4期5卷 332-342页

作者： Zhang, Deng-Yin Cui, Lei Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Ministry of Education Nanjing 210003 China

For the current opportunistic networks routing algorithms, their message arrival rate is not high and the delivery delay is large. This paper proposes a domain-epidemic spray and forward routing algorithm. The algorithm integrates redundancy and encounter prediction strategy. According to the probability of encounters between nodes, the nodes are divided into different domains. The spray and forward strategy is used between domains and the epidemic strategy is used to forward messages within a domain. Using the message confirmation mechanism and a list which is used to record the messages that have arrived to their destination, the new algorithm can effectively reduce redundant messages. Simulation results show our algorithm can effectively improve message arrival rate and reduce end-to-end delay to some extent. © 2013 Inderscience Enterprises Ltd.

关键词： Routing algorithms

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Perfect Power Visualization-Performance Optimization with Java

Perfect Power Visualization-Performance Optimization with Ja...

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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

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

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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.

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Impact of MAC frame length on energy efficiency in 6LowPAN

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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

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Secure P2P topology based on a multidimensional DHT space mapping

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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

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Study on Object Transaction Based on networked RFID Systems

Study on Object Transaction Based on Networked RFID Systems

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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

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An Improved Congestion Control Algorithm based on Social Awareness in Delay Tolerant networks

An Improved Congestion Control Algorithm based on Social Awa...

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IEEE International Conference on communications

作者： Kun Wang Huang Guo Lei Shu Bo Liu Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China Guangdong Provincial Key Lab. of Petrochemical Equipment Fault Diagnosis Guangdong University of Petrochemical Technology Guangdong China Department of Electronic Engineering Shanghai Jiaotong University Shanghai China

The routing efficiency in Delay Tolerant networks (DTN) with social characteristics degrades owing to intermittent connection and high latency. Additionally, congestion is another issue because of the limited resources of nodes. To solve these problems, an improved Socially Aware Congestion Control algorithm (SACC) is proposed. In this algorithm, the social features and the congestion level of the node are utilized to construct a Social Congestion Metric (SCM). In the forwarding process, messages are forwarded to the nodes with higher SCM. When the congestion occurs, the node calculates the social links of itself with every message's destination node, and then drops the message with minimum social link rather than random dropping. Simulation results show that in the acceptable range of delay tolerance, the proposed algorithm improves the delivery probability, decreases the dropping probability and reduces the overhead.

关键词： Delays Routing Educational institutions Software algorithms Mobile communication Ad hoc networks

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