Polytechnic University

Displaying 1-18 of 18 results

  • White Papers // Mar 2013

    New Cryptographic Challenges in Cloud Computing Era

    New trends in IT business are about outsourcing computing from on-premises resources to remote servers for cost savings and many other performance benefits. Helped by the new virtualization technologies, the cloud can handle the requirements of the market. With the migration of the data and the applications into the cloud,...

    Provided By Polytechnic University

  • White Papers // Jan 2012

    Diversity-Multiplexing Tradeoff in Multiple-Antenna Relay Systems

    The authors study the Diversity-Multiplexing Tradeoff (DMT) for the full-duplex relay channel when the source and the destination have multiple antennas, and the relay has 1 or more. They find DMT upper bounds and investigate the achievable performance of Decode-and-Forward (DF), Partial Decode-and-Forward (PDF), and Compress-and-Forward (CF) protocols. They study...

    Provided By Polytechnic University

  • White Papers // Mar 2011

    Is Random Scheduling Sufficient in P2P Video Streaming?

    Peer-To-Peer (P2P) technology has recently been employed to deliver large scale video multicast services on the Internet. Considerable efforts have been made by both academia and industry on P2P streaming design. While academia mostly focus on exploring design space to approach the theoretical performance bounds, the authors' recent measurement study...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Optimized Query Execution in Large Search Engines With Global Page Ordering

    Large web search engines have to answer thousands of queries per second with interactive response times. A major factor in the cost of executing a query is given by the lengths of the inverted lists for the query terms, which increase with the size of the document collection and are...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Compressing File Collections With a TSP-Based Approach

    Delta compression techniques solve the problem of encoding a given target file with respect to one or more reference files. Recent work has demonstrated the benefits of using such techniques in the context of file collection compression. In these scenarios, files are often better compressed by computing deltas with respect...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Multi-Packet Signature Detection Using Prefix Bloom Filters

    It is now a fact that manual defenses against worm epidemics are not practical. Recently, various automatic worm identification methods are proposed to be deployed at high-speed network nodes to respond in time to fast infection rates of worms. Unfortunately, these methods can easily be evaded by fragmentation of the...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Design and Implementation of a High-Performance Distributed Web Crawler

    Broad web search engines as well as many more specialized search tools rely on web crawlers to acquire large collections of pages for indexing and analysis. Such a web crawler may interact with millions of hosts over a period of weeks or months, and thus issues of robustness, flexibility, and...

    Provided By Polytechnic University

  • White Papers // Aug 2010

    A Unified Approach for Indexed and Non-Indexed Spatial Joins

    Most spatial join algorithms either assume the existence of a spatial index structure that is traversed during the join process, or solve the problem by sorting, partitioning, or on-the-fly index construction. In this paper, the authors develop a simple plane-sweeping algorithm that unifies the index-based and non-index based approaches. This...

    Provided By Polytechnic University

  • White Papers // Aug 2010

    Second-Order Methods for Distributed Approximate Single-And Multicommodity Flow

    The authors study local-control algorithms for maximum flow and multicommodity flow problems in distributed networks. The authors propose a second-order method for accelerating the convergence of the "First-order" distributed algorithms recently proposed by Awerbuch and Leighton. The authors' experimental study shows that second-order methods are significantly faster than the first-order...

    Provided By Polytechnic University

  • White Papers // Jan 2010

    Cooperative Communication in Wireless Systems

    The broadcast nature of wireless communications suggests that a source signal transmitted towards the destination can be "Overheard" at neighboring nodes. Cooperative communication refers to processing of this overheard information at the surrounding nodes and retransmission towards the destination to create spatial diversity, thereby to obtain higher throughput and reliability....

    Provided By Polytechnic University

  • White Papers // Nov 2009

    Round-Robin Wavelength Assignment: A New Packet Sequence Criterion in Optical Packet Switching SCWP Networks

    The WASPNET project proposed a packet sequence criterion to preserve end-to-end packet order in Optical Packet Switching (OPS) networks controlled by the SCattered Wavelength Path (SCWP) operational mode. This paper shows that this packet ordering methodology causes performance impairments, related to unbalanced wavelength usage in fiber links. This skewed usage...

    Provided By Polytechnic University

  • White Papers // Oct 2009

    A Cooperative MAC for Distributed Space-Time Coding in an IEEE 802.16 Network

    In the next-generation WiMAX system, cooperative communication is being considered as an advanced technique to increase the throughput and improve the signal quality. In a cooperative scenario, multiple stations can jointly emulate the antenna elements of a multi-input multi-output (MIMO) system in a distributed fashion. Unlike conventional space-time coding (STC)...

    Provided By Polytechnic University

  • White Papers // Oct 2008

    DATALITE: A Distributed Architecture for Traffic Analysis Via Light-Weight Traffic Digest

    In this paper, the authors propose DATALITE, a Distributed Architecture for Traffic Analysis via Light-weight Traffic digEst, which introduces a set of new distributed algorithms and protocols to support general Traffic Measurement and Analysis (TMA) functions for large-scale, 10Gbps packet-switched networks. They formulate the network-wide traffic measurement/ analysis problem as...

    Provided By Polytechnic University

  • White Papers // Jul 2008

    New Prioritization Schemes for QoS Provisioning in 802.11 Wireless Networks

    Due to the unreliable nature of the wireless medium, provisioning of Quality of Service (QoS) in wireless LANs is far more complicated than in wired networks. In order to address this challenge, IEEE 802.11e defines a framework for QoS support where packets are prioritized based on their traffic characteristics. This...

    Provided By Polytechnic University

  • White Papers // Jul 2008

    An Artificial Immune Networking Using Intelligent Agents

    The objective of the proposed work is to formally verify and implement an Artificial Immune Networking model. The work focuses on the protection against computer viruses which disrupt the normal usage of the network. The vulnerability of the network due to the malfunctions is detected in terms of faulty or...

    Provided By Polytechnic University

  • White Papers // Jun 2008

    Cooperative Recovery in Heterogeneous Mobile Networks

    In multicast/broadcast services over infrastructure-based/ cellular wireless networks (e.g. 3G cellular networks, WiMax, DVB), data is transmitted to multiple recipients from an access point/base station. Multicast greatly improves the network efficiency to distribute data to multiple recipients as compared to multiple unicast sessions of the same data to each receiver...

    Provided By Polytechnic University

  • White Papers // Jun 2008

    Behavior of Quality Assessment Metrics Under Packet Losses on Wireless Networks

    PSNR does not always rank quality of an image or video sequence in the same way that a human being. When evaluating coding proposals under specific distortion like compression or packet losses, the use of the PSNR as quality assessment metric does not guaranty the correct interpretation of the performance...

    Provided By Polytechnic University

  • White Papers // May 2008

    The Real Value of Software Engineering in a Computer Science Program (the Use of Case Studies and Projects)

    This paper addresses the important role that software engineering has in the Computer Science program for the graduate to be prepared for the work force or graduate school. The balance between theory and practice is quite critical. The important issues of understanding many examples of why software can go wrong...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Optimized Query Execution in Large Search Engines With Global Page Ordering

    Large web search engines have to answer thousands of queries per second with interactive response times. A major factor in the cost of executing a query is given by the lengths of the inverted lists for the query terms, which increase with the size of the document collection and are...

    Provided By Polytechnic University

  • White Papers // Aug 2010

    A Unified Approach for Indexed and Non-Indexed Spatial Joins

    Most spatial join algorithms either assume the existence of a spatial index structure that is traversed during the join process, or solve the problem by sorting, partitioning, or on-the-fly index construction. In this paper, the authors develop a simple plane-sweeping algorithm that unifies the index-based and non-index based approaches. This...

    Provided By Polytechnic University

  • White Papers // Aug 2010

    Second-Order Methods for Distributed Approximate Single-And Multicommodity Flow

    The authors study local-control algorithms for maximum flow and multicommodity flow problems in distributed networks. The authors propose a second-order method for accelerating the convergence of the "First-order" distributed algorithms recently proposed by Awerbuch and Leighton. The authors' experimental study shows that second-order methods are significantly faster than the first-order...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Compressing File Collections With a TSP-Based Approach

    Delta compression techniques solve the problem of encoding a given target file with respect to one or more reference files. Recent work has demonstrated the benefits of using such techniques in the context of file collection compression. In these scenarios, files are often better compressed by computing deltas with respect...

    Provided By Polytechnic University

  • White Papers // May 2008

    The Real Value of Software Engineering in a Computer Science Program (the Use of Case Studies and Projects)

    This paper addresses the important role that software engineering has in the Computer Science program for the graduate to be prepared for the work force or graduate school. The balance between theory and practice is quite critical. The important issues of understanding many examples of why software can go wrong...

    Provided By Polytechnic University

  • White Papers // Jun 2008

    Behavior of Quality Assessment Metrics Under Packet Losses on Wireless Networks

    PSNR does not always rank quality of an image or video sequence in the same way that a human being. When evaluating coding proposals under specific distortion like compression or packet losses, the use of the PSNR as quality assessment metric does not guaranty the correct interpretation of the performance...

    Provided By Polytechnic University

  • White Papers // Nov 2009

    Round-Robin Wavelength Assignment: A New Packet Sequence Criterion in Optical Packet Switching SCWP Networks

    The WASPNET project proposed a packet sequence criterion to preserve end-to-end packet order in Optical Packet Switching (OPS) networks controlled by the SCattered Wavelength Path (SCWP) operational mode. This paper shows that this packet ordering methodology causes performance impairments, related to unbalanced wavelength usage in fiber links. This skewed usage...

    Provided By Polytechnic University

  • White Papers // Mar 2011

    Is Random Scheduling Sufficient in P2P Video Streaming?

    Peer-To-Peer (P2P) technology has recently been employed to deliver large scale video multicast services on the Internet. Considerable efforts have been made by both academia and industry on P2P streaming design. While academia mostly focus on exploring design space to approach the theoretical performance bounds, the authors' recent measurement study...

    Provided By Polytechnic University

  • White Papers // Jan 2012

    Diversity-Multiplexing Tradeoff in Multiple-Antenna Relay Systems

    The authors study the Diversity-Multiplexing Tradeoff (DMT) for the full-duplex relay channel when the source and the destination have multiple antennas, and the relay has 1 or more. They find DMT upper bounds and investigate the achievable performance of Decode-and-Forward (DF), Partial Decode-and-Forward (PDF), and Compress-and-Forward (CF) protocols. They study...

    Provided By Polytechnic University

  • White Papers // Mar 2013

    New Cryptographic Challenges in Cloud Computing Era

    New trends in IT business are about outsourcing computing from on-premises resources to remote servers for cost savings and many other performance benefits. Helped by the new virtualization technologies, the cloud can handle the requirements of the market. With the migration of the data and the applications into the cloud,...

    Provided By Polytechnic University

  • White Papers // Oct 2009

    A Cooperative MAC for Distributed Space-Time Coding in an IEEE 802.16 Network

    In the next-generation WiMAX system, cooperative communication is being considered as an advanced technique to increase the throughput and improve the signal quality. In a cooperative scenario, multiple stations can jointly emulate the antenna elements of a multi-input multi-output (MIMO) system in a distributed fashion. Unlike conventional space-time coding (STC)...

    Provided By Polytechnic University

  • White Papers // Jun 2008

    Cooperative Recovery in Heterogeneous Mobile Networks

    In multicast/broadcast services over infrastructure-based/ cellular wireless networks (e.g. 3G cellular networks, WiMax, DVB), data is transmitted to multiple recipients from an access point/base station. Multicast greatly improves the network efficiency to distribute data to multiple recipients as compared to multiple unicast sessions of the same data to each receiver...

    Provided By Polytechnic University

  • White Papers // Jul 2008

    New Prioritization Schemes for QoS Provisioning in 802.11 Wireless Networks

    Due to the unreliable nature of the wireless medium, provisioning of Quality of Service (QoS) in wireless LANs is far more complicated than in wired networks. In order to address this challenge, IEEE 802.11e defines a framework for QoS support where packets are prioritized based on their traffic characteristics. This...

    Provided By Polytechnic University

  • White Papers // Jan 2010

    Cooperative Communication in Wireless Systems

    The broadcast nature of wireless communications suggests that a source signal transmitted towards the destination can be "Overheard" at neighboring nodes. Cooperative communication refers to processing of this overheard information at the surrounding nodes and retransmission towards the destination to create spatial diversity, thereby to obtain higher throughput and reliability....

    Provided By Polytechnic University

  • White Papers // Jul 2008

    An Artificial Immune Networking Using Intelligent Agents

    The objective of the proposed work is to formally verify and implement an Artificial Immune Networking model. The work focuses on the protection against computer viruses which disrupt the normal usage of the network. The vulnerability of the network due to the malfunctions is detected in terms of faulty or...

    Provided By Polytechnic University

  • White Papers // Oct 2008

    DATALITE: A Distributed Architecture for Traffic Analysis Via Light-Weight Traffic Digest

    In this paper, the authors propose DATALITE, a Distributed Architecture for Traffic Analysis via Light-weight Traffic digEst, which introduces a set of new distributed algorithms and protocols to support general Traffic Measurement and Analysis (TMA) functions for large-scale, 10Gbps packet-switched networks. They formulate the network-wide traffic measurement/ analysis problem as...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Multi-Packet Signature Detection Using Prefix Bloom Filters

    It is now a fact that manual defenses against worm epidemics are not practical. Recently, various automatic worm identification methods are proposed to be deployed at high-speed network nodes to respond in time to fast infection rates of worms. Unfortunately, these methods can easily be evaded by fragmentation of the...

    Provided By Polytechnic University

  • White Papers // Jan 2011

    Design and Implementation of a High-Performance Distributed Web Crawler

    Broad web search engines as well as many more specialized search tools rely on web crawlers to acquire large collections of pages for indexing and analysis. Such a web crawler may interact with millions of hosts over a period of weeks or months, and thus issues of robustness, flexibility, and...

    Provided By Polytechnic University