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international conference on Networking and Network Applications (NaNA)

作者： Rentao Gu Shizong Zhang Zidi Yan Yuefeng Ji Beijing Laboratory of Advanced Information Networks Beijing University of Posts and Telecommunications Beijing China State Key Lab of Information Photonics and Optical Communications Beijing University of Posts and Telecommunications Beijing China

Large number of high-speed mobile users in high-speed rail (HSR) and surrounding areas produce bandwidth requirements with space-time uneven distribution characteristics, which leads to the congestion and waste of bandwidth resource in wireless bearer network. And under the huge bandwidth demands of future 5G network, the congestion and low efficiency will be more severe. To meet bandwidth requirements, bearer network bandwidth capacity is provided according to the highest bandwidth demands. This results in the low utilization efficiency and an increase of access network costs. In order to solve the low bandwidth utilization problem while keeping the deployment costs at a low level, we propose a flexible fixed mobile convergence (FMC) access network architecture in which the clustered time wavelength division multiplexing passive optical networking (TWDM-PON) is introduced as a fronthaul and fixed network access bearer technology. In this architecture, optical network units (ONUs) are capable to be migrated flexibly between different optical line terminals (OLTs) to improve the bandwidth utilization of idle OLTs. Meanwhile, while taking into account the impactor of network quality - ONU switching times and transmission distance, a flexible ONU migration algorithm (OMA) is proposed to maximize bandwidth resource utilization. The simulation results show that the OMA promote the overall bandwidth resources utilization of OLTs.

关键词： Optical network units Bandwidth Mobile computing Mobile communication Rail transportation Optical switches Passive optical networks

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An Efficient Routing Protocol with Multihop in Ad-hoc Sensor Network in SDN Environment

An Efficient Routing Protocol with Multihop in Ad-hoc Sensor...

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作者： Jungha Jin Minyoung Shin Keecheon Kim Dept.of Computer Science & Engineering Konkuk University Dept.of IT Convergence Information Security Konkuk University

In the autonomous control network environment, there are various ways to manage the nodes located under the controller management. We have proposed a node management method for managing nodes of ad-hoc networks that operate in a wireless network environment, by proceeding with research previously. In ad-hoc networks, communication between users is provided only through direct connections between nodes. That means are Ad-hoc network technology supports mobility directly through routing algorithms. Therefore, in an ad hoc network environment, when a node connected to the node loses its loss due to node movement, the routing protocol transmits the traffic to be transmitted to the other node. In the SDN environment, the controller monitors, detects, and manages the traffic generated by the lower nodes. In this paper, we propose a hop count management method that supports multipath algorithm for node management in SDN controller.

关键词： SDN Autonomous Multipath Path-through Hop-Count

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The reserch of variable structure fuzzy neural network control system

The reserch of variable structure fuzzy neural network contr...

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2016 IEEE international conference of Online Analysis and computing Science, ICOACS 2016

作者： Huanyao, Qiu Communication and Information Technology Guangdong Mechanical and Electrical College Guangzhou China

ISBN: (纸本)9781467377546

The three-layer fuzzy neural network with variable structure applies the overall variable structure algorithm. The learning ability of fuzzy neural network with variable structure helps to extract fuzzy rules from the data automatically. Fuzzy neural network with variable structure changes the structure in training, and it improves the learning speed and convergence performance of the neural network. The fuzzy neural network with variable structure achieves systematic design of the fuzzy system by changing structure in training. It avoids the randomness of the fuzzy system design. Variable structure algorithm applies to the control system can effectively improve the convergence speed of fuzzy neural network. Simulation results show that the fuzzy neural network with variable control system has the advantage of fast convergence in training fuzzy control rules. Mean square error and error rate converges rapidly than traditional fuzzy neural network. © 2016 IEEE.

关键词： Fuzzy neural networks

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A Distributed Cloud based Video Storage System with Privacy Protection

A Distributed Cloud based Video Storage System with Privacy ...

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international conference on Advanced Communication technology

作者： Kang Il Choi Jung Hee Lee Bhum Cheol Lee Network Computing Convergence Lab. ETRI Daejeon Korea

ISBN: (纸本)9781509048922

In this paper, we present a novel method to protect privacy information for the Cloud based Video Storage System (CVSS), which not only distribute the CVSS geographically, but also use different privacy protection key algorithm for different CVSS to encode/decode the actual video data itself stored in the storage with the subscriber key for the privacy protection so that the system even under the hacking of the CVSS systems, still provide the privacy protection of the video data. We present how this system stores the video stream data transferred from the network connected camera such as IP CCTV. As the system receives the video stream, it masks the privacy related part, such as facial information or car plate number and so on, of the video stream data with a scrambling key and it also encrypts the scrambled video stream data with an encryption key. In this paper, we also present how the system retrieves the privacy information protected video image requested by either the network control centre or end users. When the network control centre or end user requests the networked video, it retrieves the corresponding video image from the video storage first. Then, it decrypts the image with the decryption key and unscrambles the decrypted image with the unscrambling key. Then it transfers the network video back to the network control center or to the end-user. We present the architecture of the distributed CVSS with the privacy protection for the Cloud based Network Function Virtualization System. We also provide flowchart for receive/transmit operation of the DCVSS. Finally, we present a POC implementation of the distributed CVSS in the Cloud based Network Function Virtualization System.

关键词： Cloud Video Storage System Privacy Protection

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A highly reliable storage based on SSD array for cloud computing environment 16

A highly reliable storage based on SSD array for cloud compu...

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IEEE international conference on Computer and Information technology (CIT)

作者： Ahn, HooYoung Kim, Junsu Lee, YoonJoon ETRI KSB Convergence Res Dept 218 Gajeong Ro Daejeon 34129 South Korea Korea Adv Inst Sci & Technol Sch Comp 291 Daehak Ro Daejeon South Korea

ISBN: (纸本)9781509043149

As Solid State Drives(SSDs) have become more cost effective, they are widely used from embedded devices to enterprise storage systems. However, they have typical problem called write amplification which is caused by out-of-place updates characteristics of NAND flash memories. As the write amplification increases, it degrades I/O performance and reduces lifetime of SSDs. When using SSDs in a parity based RAID, parity updates amplify these performance degradations. This paper presents a method to reduce write amplification of SSDs in a parity based RAID. To solve this problem, we propose a new parity update scheme, called LPUS. LPUS transforms random parity updates to sequential log writes with additional log blocks in SSD arrays. In contrast to the conventional parity update scheme, our approach reduces the block fragmentation by using parity logs and the number of parity updates by updating parities in a lazy manner. The experimental results show that, LPUS reduces write amplification up to 37% and the number of erase operations up to 50% with the reasonable size of log space.

关键词： Arrays Reliability Degradation Performance evaluation Electronic mail Transforms Cloud computing

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Digital Forensic Analysis of Telegram Messenger on Android Devices

Digital Forensic Analysis of Telegram Messenger on Android D...

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international conference on Information and Communication technology and Systems (ICTS)

作者： Satrya, Gandeva Bayu Daely, Philip Tobianto Nugroho, Muhammad Arif Telkom Univ Telkom Appl Sci Sch Bandung West Java Indonesia Kumoh Natl Inst Technol IT Convergence Engn Gumi Gyeongsangbuk D South Korea Telkom Univ Telkom Sch Comp Bandung West Java Indonesia

ISBN: (纸本)9781509013814

We provide a thorough description of all the artifacts that are generated by the messenger application Telegram on Android OS. We also provide interpretation of messages that are generated and how they relate to one another. Based on the results of digital forensics investigation and analysis in this paper, an analyst/investigator will be able to read, reconstruct and provide chronological explanations of messages which are generated by the user. Using three different smartphone device vendors and Android OS versions as the objects of our experiments, we conducted tests in a forensically sound manner.

关键词： Android forensics Telegram remnant data

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Data-Driven Feature Word Selection for Clustering Online News Comments

Data-Driven Feature Word Selection for Clustering Online New...

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international conference on Big Data and Smart computing (BigComp)

作者： Cho, Heeryon Lee, Jong-Seok Kookmin Univ Sch Comp Sci Seoul South Korea Yonsei Univ Sch Integrated Technol Inchon South Korea Yonsei Univ Yonsei Inst Convergence Technol Inchon South Korea

ISBN: (纸本)9781467387965

Popular news articles attract thousands of online comments, making it tedious and time-consuming for a manual review. Automatically clustering similar comments can help reduce the burden of manual analyses, but appropriate feature words must be selected for successful clustering. In this paper, we present a data-driven feature word selection method which realizes structurally superior clustering of online comments. The top 1,000 most frequent nouns appearing across the entire 7.44 million Korean online comments are selected to construct an overall noun set. Frequent nouns in the online comments of each news article are selected to construct the local noun set. The intersection between the local and overall noun set is taken to construct the global noun set. The global noun set is removed from the corresponding local noun set to construct the distinct noun set. The top 250 most frequent nouns are selected for each of the local, global, and distinct noun sets for K-means clustering. The clustered results are evaluated using three internal cluster validation indices, Dunn, PBM, and Silhouette. As a result, online comments clustered using distinct nouns produced structurally superior clusters when compared to the other types of nouns, local and global.

关键词： feature word selection online news comments K-means clustering cluster validation index text analysis

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Accelerated SOR-like method for augmented linear systems

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BIT NUMERICAL MATHEMATICS 2016年第2期56卷 557-571页

作者： Njeru, Patrick Njue Guo, Xue-Ping E China Normal Univ Dept Math 500 Dongchuan RD Shanghai 200241 Peoples R China E China Normal Univ Shanghai Key Lab PMMP Shanghai 200062 Peoples R China

By accelerating the SOR-like method by two parameters alpha and omega, we propose an accelerated SOR-like (ASOR) method for solving the augmented linear systems. The convergence of the ASOR method is discussed under suitable restrictions on the iteration parameters alpha and omega, and the experimental optimal values of the iteration parameters are determined. Numerical results are presented to show the efficiency of the ASOR method when the iteration parameters alpha and omega are suitably chosen.

关键词： Saddle-point problem Augmented system of linear equations Accelerated SOR-like method Optimal parameters convergence

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A Data LifeCycle Model for Smart Cities

A Data LifeCycle Model for Smart Cities

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7th international conference on Information and Communication technology convergence (ICTC) - Towards Smarter Hyper-Connected World

作者： Sinaeepourfard, Amir Garcia, Jordi Masip-Bruin, Xavier Marin-Tordera, Eva Yin, Xuefeng Wang, Chao Univ Politecn Cataluna BarcelonaTech Adv Network Architectures Lab CRAAX Barcelona Spain Tongji Univ Coll Elect & Informat Engn Shanghai Peoples R China

ISBN: (纸本)9781509013258

Smart Cities are the most challenging and promising technological solutions for absorbing the increasing pressure of population growth, while simultaneously enforcing a sustainable economic progress as well as a higher quality of life. Several technologies are involved in a potential Smart City deployment, although data are the fuel to achieve the demanded and mandatory smartness. Data can be obtained from multiple sources, in large quantities, and with a variety of formats, therefore, an appropriate management is critical for their effective usage. Data life cycle models constitute an effective trend towards developing an integral and efficient data management framework, from data creation to data consumption and removal. In this paper we present the Smart City Comprehensive Data LifeCycle (SCC-DLC) model, a data management architecture generated from a comprehensive scenario agnostic model, tailored for the particular scenario of Smart Cities. We define the management of each data life phase, and describe its implementation on a Smart City with Fog-to Cloud (F2C) resources management, an architecture that combines the advantages of both cloud and fog strategies.

关键词： Smart City Fog to Cloud (F2C) computing Data Management Resources Management Data LifeCycle Model

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Cooperative Spectrum Sharing with Energy Harvesting Best Secondary User Selection and Non-orthogonal Multiple Access

Cooperative Spectrum Sharing with Energy Harvesting Best Sec...

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international conference on computing, Networking and Communications (ICNC)

作者： Kader, Md Fazlul Shahab, Muhammad Basit Shin, Soo Young Kumoh Natl Inst Technol WENS Lab Dept IT Convergence Engn Gumi Gyeongsangbuk D South Korea

ISBN: (纸本)9781509045884

We propose two novel cooperative spectrum sharing (CSS) protocols by using time-switching and power-splitting based energy harvesting (EH), namely CSS-TSP and CSS-PSP, respectively. The considered system consists of a set of energy constrained secondary transmitters (STs) that cooperate with the primary user to forward its symbol. All STs rely on the harvested energy from the source signal to forward the primary symbol. In exchange of cooperation, one of the STs behaving as the best EH decode-and-forward relay (STbr) gets channel access simultaneously with the primary user according to the non-orthogonal multiple access. Two STbr selection strategies, namely STbr. selection based on harvested energy in current block of time and STbr selection based on harvested energy from current plus previous blocks of time, have been proposed. The distributed nature of the STbr selection in the proposed schemes to forward the primary symbol increases the network lifetime. We have investigated the achievable sum data rate/throughput of both CSS-TSP and CSS-PSP. Moreover, the optimal EH ratio that maximizes the sum data rate of both protocols is also investigated numerically.

关键词： Energy harvesting non-orthogonal multiple access cooperative spectrum sharing sum data rate

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