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Lecture Notes in computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) 2014年 8342卷 152-175页

作者： Cao, Son Thanh Nguyen, Linh Anh Szalas, Andrzej Faculty of Information Technology Vinh University 182 Le Duan street Vinh Nghe An Viet Nam Institute of Informatics University of Warsaw Banacha 2 02-097 Warsaw Poland Faculty of Information Technology VNU University of Engineering and Technology 144 Xuan Thuy Hanoi Viet Nam Dept. of Computer and Information Science Linköping University SE-581 83 Linköping Sweden

It is known that the OWL 2RL Web Ontology Language Profile has PTime data complexity and can be translated into Datalog. However, the result of translation may consist of a Datalog program and a set of constraints in the form of negative clauses. Therefore, a knowledge base in OWL 2RL may be unsatisfiable. In the current paper we first identify a maximal fragment of OWL 2RL, called OWL 2RL+, with the property that every knowledge base expressed in OWL2RL+ can be translated to a Datalog program and hence is satisfiable. We then propose some extensions of OWL 2RL and OWL 2RL + that still have PTime data complexity. © 2014 Springer-Verlag Berlin Heidelberg.

关键词： Birds

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Laying out interconnects on optical printed circuit boards

Laying out interconnects on optical printed circuit boards

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ACM/IEEE Symposium Architecture for Networking and Communications Systems, ANCS

作者： Apostolos Siokis Konstantinos Christodoulopoulos Emmanouel Manos Varvarigos Computer Technology Institute and Press - Diophantus Patras Greece Computer Engineering and Informatics Department University of Patras Greece

ISBN: (纸本)9781479965342

Short distance optical interconnections, on-printed circuit boards, on-backplanes, and even on-chip, are a promising solution for replacing copper interconnections in future Data Center and HPC systems. Since photonic technology introduces new network building blocks, topology design for all the packaging levels should be reconsidered. This paper focuses on the on-board level of the packaging hierarchy, and proposes lay-out strategies for optical interconnection networks on optical printed circuit boards (OPCBs), based on direct topology families (tori, meshes and fully connected networks). We also describe a methodology for designing OPCBs given a set of input parameters, including building blocks specifications as well as traffic demands. The onboard topology design methodology generates all the feasible designs within the topology families examined, following our proposed OPCB lay-out approach, and selects the optimal designs based on specific optimization criteria.

关键词： Optical interconnections Topology Network topology Optical waveguides Integrated circuit interconnections Packaging Photonics

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An adaptive weighted online AL-FEC algorithm over mobile multicast networks

An adaptive weighted online AL-FEC algorithm over mobile mul...

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IEEE Conference on Wireless Communications and Networking

作者： Christos Bouras Nikolaos Kanakis Computer Engineering and Informatics Department University of Patras Greece Computer Technology Institute and Press “Diophantus” Patras Greece

ISBN: (纸本)9781479930845

A crucial point on the delivery of multicast content over mobile multicast networks is the utilization of Forward Error Correction (FEC) codes on the application layer (AL-FEC) so as to introduce robustness against arbitrary erasures on different recipients without the need of inefficient common error control methods based on data retransmission. FEC is a feedback free error recovery method where the sender introduces redundant data in advance with the source data enabling the recipients to recover from different arbitrary packet losses. The main issue on the efficient application of AL-FEC protection is the adaptation of the introduced redundancy to the current network conditions, in order to avoid network resources wastage ensuring at the same time sufficient transmission robustness. Based on this, in this work we present an adaptive weighted online algorithm aiming at the efficient application of RaptorQ AL-FEC codes over mobile multicast services. The proposed algorithm adapts the introduced AL-FEC transmission overhead exploiting at first the reception reports ability defined by several mobile multicast standards and thereafter the performance properties of the newly introduced RaptorQ FEC codes. We introduce the competitive framework of the efficient application of AL-FEC protection over mobile multicast networks, in the context of which, we design and analyze the adaptive online weighted algorithm and we further provide a series of simulation results to analyze the performance of the proposed scheme.

关键词： Algorithm design and analysis Packet loss Adaptive algorithms Encoding Mobile communication Forward error correction

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Profile Cloning Detection in Social Networks

Profile Cloning Detection in Social Networks

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European Network Intelligence Conference (ENIC)

作者： Piotr Bródka Mateusz Sobas Henric Johnson Institute of Informatics Wroclaw University of Technology Wroclaw Poland Department of Computer Science Engineering Blekinge Institute of Technology Karlskrona Sweden

Profile cloning is a severe security issue in social networks since it is used to make a profile identical to existing ones. Profile cloning detection creates a possibility to detect frauds that would use people's trust to gather social information. This paper proposes two novel methods of profile cloning detection and also presents state-of-the-art research. The first method is based on the similarity of attributes from both profiles and the second method is based on the similarity of relationship networks. The methods are further evaluated with experiments and the results clearly describes that the proposed methods are useful and efficient compared to existing methods. The paper also stress that profile cloning in Facebook is not only possible but also fairly easy to perform.

关键词： Cloning Facebook Equations Mathematical model Educational institutions

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Empirical evidence and state of practice of software agile teams

Empirical evidence and state of practice of software agile t...

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作者： Papatheocharous, Efi Andreou, Andreas S. SICS Swedish ICT Swedish Institute of Computer Science Isafjordsgatan 22/Kistagången 16 Box 1263 SE-164 29 Kista Stockholm Sweden Department of Computer Engineering and Informatics Cyprus University of Technology 31 Archbishop Kyprianos Lemesos3603 Cyprus

The paper provides an in depth analysis of empirical evidence on the state of practice within the agile domain obtained through a survey conducted in 2012. The context of focus is agile software processes and teams and the particular topics of interest revolve around three axes: (i) communication;(ii) project management;and (iii) quality assurance and validation. The aim of the survey is to deliver the current levels of agile adoption and practices as these are recorded in the responses of professionals in IT services and the software industry. The goal of the survey is to provide evidence-based assessment of the level of agile adoption by software development organizations, in relation to the general profile of the respondents (country of origin, business sectors, roles, etc.) and compared with different types of practices followed, such as agile techniques adopted, team organization and communication techniques, and project management. Particular patterns and trends are identified in the survey connecting the use of the agile paradigm with the aforementioned practices and investigating its relation with the roles of the respondents and the business strategies of their organizations. Copyright © 2014 John Wiley & Sons, Ltd. Copyright © 2014 John Wiley & Sons, Ltd.

关键词： Surveys

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A highly motivated blended learning model oriented to computer engineering educators

A highly motivated blended learning model oriented to comput...

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International Conference on computer Science & Education (ICCSE)

作者： Panagiotis Angelopoulos Michael Paraskevas Isidoros Perikos Thomas Zarouchas Computer Technology Institute and Press “Diophantus” (CTIP) Patras Greece Computer and Informatics Engineering Department Technological Educational Institute of Western Greece

This work presents a versatile blended learning model oriented to computer engineering educators in order to advance their technical skills. For the realization of this model a Hybrid Educational Platform (HEP) was developed exploiting the robustness and functionality of the Greek School Network (GSN). Findings from the evaluation of the related training activities indicate a well-promising learning framework that compensates the growing needs on information and communication technologies, thus establishing a modern and attractive education environment in the Greek Society.

关键词： Materials computers Computational modeling Robustness Multimedia communication Employment Blogs

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A fabrication-tolerant SOI polarization splitter-rotator with cascaded MMI couplers and an assisted bi-level taper

A fabrication-tolerant SOI polarization splitter-rotator wit...

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Asia Communications and Photonics Conference, ACPC 2014

作者： Wang, Jing Niu, Ben Huang, Haiyang Li, You Li, Ming Sheng, Zhen Wu, Aimin Li, Wei Wang, Xi Zou, Shichang Qi, Minghao Gan, Fuwan State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology Chinese Academy of Sciences Shanghai200050 China School of Electrical and Computer Engineering Birck Nano-technology Center Purdue University West LafayetteIN47906 United States

We propose a fabrication-tolerant SOI polarization splitter-rotator with cascaded MMI couplers and an assisted bi-level taper. The performance remains very stable even for a large deviation of ±50 nm in terms of ... 详细信息

ISBN: (纸本)9781557528520

关键词： Fabrication

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Fairness-based resource allocation with minimum rate guarantee in a multiuser OFDMA system

Fairness-based resource allocation with minimum rate guarant...

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5th KKU International Engineering Conference 2014, KKU-IENC 2014

作者： Ruangchaijatupon, Nararat Ji, Yusheng Charnsripinyo, Chalermpol Sonehara, Noboru Department of Electrical Engineering Khon Kaen University Muang Khon Kaen Thailand National Institute of Informatics 2-1-2 Hitotsubashi Chiyoda-ku Tokyo Japan National Electronics and Computer Technology Center Thailand

ISBN: (纸本)9783038350903

We propose a resource allocation scheme based on Proportional Fairness (PF) for minimum bit rate guarantee in a multiuser, frequency-selective frame-based OFDMA system. Instead of considering subcarrier-and-bit allocation, we consider a more realistic scheduling which is performed at the beginning of each frame, while allowing time-slots multiplexing among active users. Our scheme aims to guarantee different minimum bit rates to different users, while throughput fairness among users is maintained. We formulate the optimization problem based on a multichannel proportional fairness objective function. Minimum bit rate guarantee is taken as the constraint. The optimization problem is solved by using the Lagrange multiplier method. Then, we use our fast cross-layer approach integrated to our optimization solution to schedule packets from finitely backlogged queues. Simulations with user mobility are conducted. The results show that the proposed scheme can serve users with satisfied minimum bit rate requirement. Furthermore, the simulation results also confirm throughput fairness among users. © (2014) Trans Tech Publications, Switzerland.

关键词： Optimization

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Power management for wireless adapters using multiple feedback metrics

Power management for wireless adapters using multiple feedba...

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International Wireless Communications and Mobile Computing Conference, IWCMC

作者： C. Bouras V. Kapoulas K. Stamos N. Stathopoulos N. Tavoularis Computer Engineering and Informatics Dept. University of Patras Greece Computer Technology Institute and Press “Diophantus” Patras Greece

The main focus of this work is the effort to minimize the power consumption on mobile devices such as notebooks, netbooks, tablets, tablets, smartphones, etc. by adjusting the transmission power of the wireless card, thus extending the battery life. In order to achieve that, we provide a mechanism (which we call Signal Adaptation Mechanism - SAM) that optimizes the power depending on the quality of the connection. This mechanism measures the quality of the transmission and adjusts the transmission power accordingly, by utilizing an expanded array of metrics along the Received Signal Strength Indicator (RSSI), for more accurate estimation. It also aims at easy implementation on various wireless adapters. In order to evaluate, fine-tune and improve the mechanism, a list of experiments has been performed. These experiments were conducted on a real (as opposed to simulated) ad-hoc network, where the nodes of the networks followed varying moving patterns.

关键词： Signal to noise ratio Base stations Peer-to-peer computing Power demand Ad hoc networks Wireless communication

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HUMAN TRACKING & VISUAL SPATIO-TEMPORAL STATISTICAL ANALYSIS

HUMAN TRACKING & VISUAL SPATIO-TEMPORAL STATISTICAL ANALYSIS

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IEEE International Conference on Image Processing

作者： D. Ioannidis S. Krinidis D. Tzovaras S. Likothanassis Information Technologies Institute Centre for Research and Technology - Hellas Computer Engineering and Informatics University of Patras

ISBN: (纸本)9781479957521

In this work, a novel, multi-space, real-time and robust human tracking system is going to be presented. The system exploits a multi-camera network monitoring the multi-space dynamic environment under interest, detecting and tracking the humans in it. The system is able to handle the dynamic changes of the environment, as well as partial occlusions utilizing virtual top cameras. Furthermore, the system is able to real-time visualize the detection and tracking results on the architectural map of the dynamic environment, as well as a variety of statistics. The visual spatio-temporal analysis of the tracked data are presented in a consolidated form for the overall monitoring area and analytically for each space separately and for each tracked human. These statistics could be also combined with the energy consumption in the area, as well as with other environmental data providing semantic information such as comfort. The overall system is equipped with a number of visual interactive tools providing real-time spatio-temporal human presence analysis offering to the user the opportunity to capture and isolate the areas/spaces with high human presence, the days and times of high human presence, to correlate this information with the potential energy consumption and indicators such as comfort.

关键词： Human tracking Human presence statistics Spatio-temporal analysis Visual analysis

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