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IEEE International Conference on Consumer Electronics-Taiwan (ICCE-TW)

作者： ShengQian Zhou Jianxin Chen Xinzhi Wang Liang Zhou Baoyu Zhen Jingwu Cui Key Lab of Broadband Wireless Communication and Sensor Network Technology of Ministry of Education Nanjing University of Posts & Telecommunications Nanjing University of Posts and Telecommunications Nanjing CN

ISBN: (纸本)9781479987467

Fall detection is one of the feasible solutions for solving the problem of aging of population. This paper presents an algorithm to detect falling for the elderly with one wrist-worn device. The algorithm has lower computation complexity to determine the fall event according to the inclination gradient. Experimental results show that it performs better than another similar devices with the average sensitivity and specificity of 94.44% and 100%, respectively.

关键词： Accelerometers Senior citizens Sensitivity Performance evaluation Classification algorithms Complexity theory Legged locomotion

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A Lightweight Encoding Mechanism for Encrypted User Notification on Mobile Device in Power Grid System

A Lightweight Encoding Mechanism for Encrypted User Notifica...

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2015 International Conference on Computer Information Systems and Industrial Applications(CISIA2015)

作者： T.Zhang Z.X.Sun Y.C.Jin State Grid Smart Grid Research Institute Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry Education Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510805750

As a large amount of users are now using the short message service(SMS) for communication,the demand for security is growing much stronger than ever *** notification encrypted with traditional encrypt mechanism can be transported via SMS only if the encrypted message is encoded into text *** are still many defects on existing data encoding mechanism in terms of *** paper provides a lightweight encoding mechanism for encrypted short message based on UCS-2 Chinese character set which has a lower data extension rate than commonly used encoding *** for functionality and efficiency proves the new mechanism improves the performance for user notification transmission via SMS on mobile device in power grid system.

关键词： user notification short message service(SMS) text encryption data encoding UCS-2 Chinese character set

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A Context-aware Data Processing Model in power communication networks

A Context-aware Data Processing Model in power communication...

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IEEE International Conference on communications in China Workshops (ICCC)

作者： Yunfei Guo Kun Wang Shidong Liu Jinghong Guo Heng Lu Smart Grid Research Institute State Grid Nanjing china Key Lab of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing china

ISBN: (纸本)9781467397025

The power communication networks is a relatively complex system with high security, which is performed in a number of ways, such as safety of power generation equipment, security of transmission and distribution lines, as well as data transmission security. The core of power communication networks security is context-aware data processing. With continuously extending in scale of the power communication networks, power communication data process become more complicated. In order to realize automatization of data processing of the power communication networks, this paper proposed a Context-aware Data Processing Model in power communication networks (CDPM). In this three-layer architecture, a Distributed Database Based on Data Categorization (DDB-DC) is designed in storage layer, which is able to choose the most efficient approach to store the context-aware data from the gathering layer according to different context-aware data types. Then, a Real-time Feature Extraction algorithm (RFE) for context-aware systems is presented in the computing layer to process the context-aware data stream. The model is a new data processing method in power communication networks.

关键词： Communication networks Data processing Distributed databases Algorithm design and analysis Data models Feature extraction Correlation

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A sub-carrier allocation and power control algorithm for D2D users in OFDM systems

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Journal of Computational Information Systems 2014年第14期10卷 6117-6124页

作者： Jing, Wenwen Zhu, Qi Jiangsu Key Lab of Wireless Communications Key Lab on Wideband Wireless Communications and Sensor Network Technology of Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

A resource allocation algorithm for D2D users which establishes an optimization problem aimed at maximizing D2D users throughput and guaranteeing cellular users QoS is proposed in this paper. To solve the problem there need two steps. First, the sub-carrier allocation process based on balancing the quality of both cellular and D2D users is given, and then the sub-gradient method of power allocation is shown. Simulation results prove that the throughputs of both D2D system and the total system are comparatively improved with the proposed algorithm. © 2014 by Binary Information Press

关键词： Power control

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A parallel HEVC encoder scheme based on Multi-core platform

A parallel HEVC encoder scheme based on Multi-core platform

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2015 4th National Conference on Electrical,Electronics and Computer Engineering(NCEECE 2015)

作者： Shu Jun Hu Dong Education Ministry’s Key Lab of Broadband Wireless Communication and Sensor Network Technology Education Ministry’s Engineering Research Center of Ubiquitous Network and Health Service System Jiangsu Province’s Key Lab of Image Procession and Image Communications Nanjing University of Post and Telecommunications

ISBN: (纸本)9781510819085

In this paper, we propose a parallel HEVC encoder scheme based on multi-core platform, which provides maximized parallel scalability by exploiting two-level parallelism, namely, the frame level parallelism and the CTB level parallelism. Inspired by the intra-CTB row level parallelism of WPP in HEVC, we investigate the inter-frame CTB prediction dependency to its reference CTBs, and find the inter-CTB correlation. Using this inter-correlation, we divide a frame into CTB units and create CTB-row level coding threads when their corresponding reference CTBs are available. Each thread is bonded to a processing core, therefore, both intra- and inter-CTB rows can be encoded in parallel. Moreover, we introduce a priority scheduling mechanism to control the coding threads. Experiments on Tilera-Gx36 multi-core platform show that, compared with serial execution, the proposed method achieves 3.6 and 4.3 times speedup for 1080 P and 720 P video sequences, respectively.

关键词： HEVC multi-core platform parallel processing frame-level CTB-level

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Price and customer satisfaction based access control scheme

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Journal of Computational Information Systems 2014年第5期10卷 1893-1902页

作者： Zhang, Dengyin Wang, Xuemei Li, Dacheng Key Lab. of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing 210003 China

To solve the fairness problem in user access of mobile communication systems, we proposed an access control scheme based on price and customer satisfaction (PSAC) in this paper. In the scheme, we borrow Cobb-Douglas ordinal utility model to designate a price function which changes with the current system load and service transmission rate, and evaluate customer satisfaction according to waiting time and allocated bandwidth. The system accepts requests in the descending order of these requests' access probability, the calculation of which depends on price and customer satisfaction. Simulation results show that the PSAC algorithm we proposed can achieve high resource utilization, enhance the overall revenue, and ensure the fairness of the user access. © 2014 Binary Information Press.

关键词： Customer satisfaction

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Review on MAC Protocols in Energy-Harvesting wireless Body Area networks

Review on MAC Protocols in Energy-Harvesting Wireless Body A...

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International Conference on Identification, Information and Knowledge in the Internet of Things (IIKI)

作者： Shidong Liu Kun Wang Jinghong Guo Yao Wang Xin Qi Smart Grid Research Institute State Grid Nanjing china Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and Telecommunications Nanjing China

wireless Body Area networks (WBANs) have become a leading solution in Mobile Health (mHealth). Typically, a WBAN consists of in-body or around-body sensor nodes for collecting data of physiological feature. For a WBAN to provide high throughput and low delay in an energy-efficient way, designing an efficient Medium Access Control (MAC) protocol is of paramount importance because the MAC layer coordinates nodes' access to the shared wireless medium. To show the difference of MAC protocols between Energy-Harvesting wireless body area networks (EH-WBANs) and battery powered WBANs (BT-WBANs), this article surveys the latest progresses in energy harvesting techniques and WBAN MAC protocol designs.

关键词： wireless communication Media Access Protocol Body area networks Energy harvesting wireless sensor networks Batteries

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Risk prediction model based on improved AdaBoost method for cloud users

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Open Cybernetics and Systemics Journal 2015年第1期9卷 44-49页

作者： Zhang, Lin Rao, Kaili Wang, Ruchuan Jia, Yishang College of Computer Nanjing University of Posts and Telecommunications Nanjing210003 China Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks NanjingJiangsu Province210003 China Key Lab of Broadband Wireless Communication and Sensor Network Technology Nangjing University of Posts and Telecommunications Ministry of Education Jiangsu Province Nangjing210003 China

Considering the problem how to protect the cloud services from being destroyed by cloud users, the riskprediction model based on improved AdaBoost method is proposed. The risk prediction is regarded as two-class classification problem, and the risk of new cloud users could be predicted by the attributes of historical cloud users. In order to improve the result of predicted, AdaBoost method is adopted in this paper. The error rate of the last training is used to adjust the sample distribution of the next training, which can make the next training have stronger ability of identification for the error-classified samples. At the same time the weight of each weak classifier is set. After all, the strong classifier is generated by combined the weak classifiers through voting, which can improve the overall result of classification. Considering the wrongly-predicted cost, AdaBoost method is improved. The method of cost-sensitive is added into the model in order to minimal the misclassified-cost. Experiments show that the cost-sensitive AdaBoost method has better classification result than the traditional ones and it can predict the risk of the new cloud user effectively and protect the security of the cloud services. © Zhang et al.

关键词： Adaptive boosting

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A Multi-dimensional Index Structure Based on Improved VA-file and CAN in the Cloud

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International Journal of Automation and computing 2014年第1期11卷 109-117页

作者： Chun-Ling Cheng Chun-Ju Sun Xiao-Long Xu Deng-Yin Zhang College of Computer Nanjing University of Posts and Telecommunications Jiangsu High Technology Research Key Laboratory for Wireless Sensor Networks Key Lab of Broadband Wireless Communication and Sensor Network Technology Nanjing University of Posts and TelecommunicationsMinistry of Education Jiangsu Province

Currently,the cloud computing systems use simple key-value data processing,which cannot support similarity search efectively due to lack of efcient index structures,and with the increase of dimensionality,the existing tree-like index structures could lead to the problem of"the curse of dimensionality".In this paper,a novel VF-CAN indexing scheme is ***-CAN integrates content addressable network(CAN)based routing protocol and the improved vector approximation fle(VA-fle) *** are two index levels in this scheme:global index and local *** local index VAK-fle is built for the data in each storage ***-fle is thek-means clustering result of VA-fle approximation vectors according to their degree of *** cluster forms a separate local index fle and each fle stores the approximate vectors that are contained in the *** vector of each cluster center is stored in the cluster center information fle of corresponding storage *** the global index,storage nodes are organized into an overlay network CAN,and in order to reduce the cost of calculation,only clustering information of local index is issued to the entire overlay network through the CAN *** experimental results show that VF-CAN reduces the index storage space and improves query performance efectively.

关键词： Cloud computing index similarity search clustering vector approximation fle(VA-fle) content addressable network(CAN)

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Green cloud task-scheduling algorithm based on improved BPSO

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Journal of Information and Computational Science 2014年第12期11卷 4301-4308页

作者： Ouyang, Zhiyou Wang, Kun Xu, Lili Key Lab. of Broadband Wireless Communication and Sensor Network Technology Ministry of Education Nanjing University of Posts and Telecommunications Nanjing China

Cloud computing is experiencing a rapid development since a large amount of data need to be addressed. How to carry on the reasonable task scheduling plays a vital role in the operating efficiency of cloud computing. This paper proposes a Green Cloud Task-scheduling Algorithm (GCTA) based on the improved Binary Particle Swarm Optimization (BPSO). This work avoids matrix operations by using a pipeline number for virtual machines and redefining the position and velocity of particle. Simulation results show that the proposed GCTA has less execution time, and reduces resource consumption accordingly. © 2014 Binary Information Press

关键词： Cloud computing

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