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University of Crete
(32 results)-
White Papers
Analysis of the Perceived VoIP Quality Under Various Wireless Network Conditions
February 26, 2010, 12:00am PST
This paper focuses on the comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover, under different background traffic conditions...
Provided by Technical University of Crete
-
White Papers
Querying XML Data With SPARQL
January 31, 2010, 12:00am PST
SPARQL is today the standard access language for Semantic Web data. In the recent years XML databases have also acquired industrial importance due to the widespread applicability of XML in the...
Provided by Technical University of Crete
-
White Papers
Design and Implementation of a Trust-Aware Routing Protocol for Large WSNs
July 1, 2010, 12:00am PDT
The domain of Wireless Sensor Networks (WSNs) applications is increasing widely over the last few years. As this new type of networking is characterized by severely constrained node resources,...
Provided by Technical University of Crete
-
White Papers
Object-Relational Database Representations for Text Indexing
June 17, 2009, 12:00am PDT
One of the distinctive features of Information Retrieval systems comparing to Database Management systems, is that they offer better compression for posting lists, resulting in better I/O...
Provided by University of Crete
-
White Papers
A Novel Approach for Allocating Network and It Resources Offered by Different Service Providers
November 1, 2010, 12:00am PDT
The pace of innovation in computer and networking technology allows many new IT services to emerge rapidly and often benefit from new network services that support faster connectivity and better...
Provided by University of Crete
-
White Papers
Query Evaluation in P2P Systems of Taxonomy-Based Sources: Algorithms, Complexity, and Optimizations
September 19, 2007, 12:00am PDT
In this paper the authors address the problem of answering queries over a peer-to-peer system of taxonomy-based sources. A taxonomy states subsumption relationships between negation-free DNF...
Provided by University of Crete
-
White Papers
Location-Based Media Sharing in a MP2P Network
October 12, 2007, 12:00am PDT
The Web and Internet have been catalysts for the creation of collaborative applications and tools. On-line collaboration has been enriched with new applications and tools for storing, sharing, and...
Provided by University of Crete
-
White Papers
Multi-Level Application-Based Traffic Characterization in a Large-Scale Wireless Network
May 5, 2007, 12:00am PDT
With the increasing deployment of wireless networks, network management and configuration of wireless Access Points (APs) has become one of the main concerns of network operators. While statistics...
Provided by University of Crete
-
White Papers
Total Factor Productivity Growth And The Environment: A Case For Green Growth Accounting
April 1, 2007, 12:00am PDT
The authors examine whether the use of the environment, proxied by CO2 emissions, as a factor of production contributes, in addition to conventional factors of production to output growth, and...
Provided by University of Crete
-
White Papers
A Comparative Analysis of the Perceived Quality of VoIP Under Various Wireless Network Conditions
April 14, 2010, 12:00am PDT
This paper performs a comparative analysis of the perceived quality of (unidirectional, non-interactive) VoIP calls under various wireless network conditions (e.g., handover, high traffic demand)....
Provided by University of Crete
-
White Papers
A Game-Theoretical Modeling Framework for Spectrum Markets and Cognitive-Radio Devices
February 6, 2011, 12:00am PST
This paper presents a novel game-theoretical framework to model the evolution of spectrum markets that consists of multiple spectrum/network operators that provide wireless access to users. It...
Provided by University of Crete
-
White Papers
Modeling Approximations for an IEEE 802.11 WLAN Under Poisson MAC-Level Arrivals
February 23, 2007, 12:00am PST
The authors examine two approximative models for the behavior of an IEEE 802.11 WLAN under Poisson MAC-level arrivals. Both models extend, in a simple manner, the analysis for saturated stations...
Provided by University of Crete
-
White Papers
802.11e EDCA Protocol Parameterization: A Modeling and Optimization Study
March 26, 2007, 12:00am PDT
The IEEE 802.11e MAC protocol specifies an Enhanced Distributed Channel Access (EDCA) mechanism with adjustable protocol parameters, providing differentiated access to wireless stations. The EDCA...
Provided by University of Crete
-
White Papers
Access Point Assignment Algorithms in WLANs Based on Throughput Objectives
February 11, 2008, 12:00am PST
In this paper, the authors present branch-and-bound algorithms for the access point assignment problem in WLANs, when the objective function is based on the throughput of stations in the network....
Provided by University of Crete
-
White Papers
Architecture of a Network Monitoring Element
July 27, 2006, 12:00am PDT
A Network Monitoring system is a vital component of a Grid; however, its scalability is a challenge. This paper proposes a network monitoring approach that combines passive monitoring, a domain...
Provided by Technical University of Crete
-
White Papers
Adjacent Channel Interference in 802.11a: Modeling and Testbed Validation
November 3, 2007, 12:00am PDT
In this paper, the authors utilize the model for calculation of the interference power by partially overlapping channels introduced in and combine it with the Signal to Interference plus Noise...
Provided by University of Crete
-
White Papers
Backscattering Improvement of UHF RFID Tag Efficiency
October 27, 2009, 12:00am PDT
In this paper, a tag-load selection methodology is proposed for optimized tag-to-reader backscatter communication. Derivation of the method is based on antenna/communication theory and applies to...
Provided by Technical University of Crete
-
White Papers
A UHF Radio Frequency Identification (RFID) System for Healthcare: Design and Implementation
November 4, 2010, 12:00am PDT
This paper presents a customized design of a UHF Radio Frequency IDentification (RFID) system to be installed at the Bank Of Cyprus Oncology Center (BOCOC) in Cyprus. This is a pilot project that...
Provided by Technical University of Crete
-
White Papers
On the Design of Passive RFID Tags for ASK Modulation
May 26, 2011, 12:00am PDT
Design of passive UHF RFID tag for ASK modulation is investigated. It is shown that tag antenna structural mode strongly affects the tag's backscattered field, shaping the phase and magnitude of...
Provided by Technical University of Crete
-
White Papers
Empirical Evaluation of Signal-Strength Fingerprint Positioning in Wireless LANs
October 19, 2010, 12:00am PDT
This paper proposes a novel localization technique based on a multivariate Gaussian modeling of the signal strength measurements collected from several Access Points (APs) at different locations....
Provided by University of Crete
-
White Papers
Analyzing the Impact of Various Wireless Network Conditions on the Perceived Quality of VoIP
April 14, 2010, 12:00am PDT
This paper focuses on a comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover and under different background traffic conditions at a...
Provided by University of Crete
-
White Papers
Trend Forecasting Based on Singular Spectrum Analysis of Traffic Workload in a Large-Scale Wireless LAN
June 19, 2008, 12:00am PDT
Network traffic load in an IEEE802.11 infrastructure arises from the superposition of traffic accessed by wireless clients associated with Access Points (APs). An accurate load characterization...
Provided by University of Crete
-
White Papers
A Novel Multi-Layer Framework for Modeling the Evolution of Spectrum Markets and Cognitive-Radio Devices
April 15, 2011, 12:00am PDT
This paper presents a novel multi-layer modeling framework for the evolution of spectrum markets of multiple spectrum/network operators that provide wireless access to users. It integrates models...
Provided by University of Crete
-
White Papers
Modeling Approximations for an IEEE 802.11 WLAN Under Poisson MAC-Level Arrivals
February 23, 2007, 12:00am PST
The authors examine two approximative models for the behavior of an IEEE 802.11 WLAN under Poisson MAC-level arrivals. Both models extend, in a simple manner, the analysis for saturated stations...
Provided by University of Crete
-
White Papers
Access Point Selection for Improving Throughput Fairness in Wireless LANs
May 8, 2007, 12:00am PDT
As wireless networks become more ubiquitous, efficient sharing of wireless resources will become increasingly important, especially since the capacity of wireless networks is at least an order of...
Provided by University of Crete
-
White Papers
Experimental Investigation of Cooperative Schemes on a Real-Time DSP-Based Testbed
March 31, 2009, 12:00am PDT
Experimental results on the well-known cooperating relaying schemes, Amplify-and-Forward (AF), Detect-and-Forward (DF), Cooperative Maximum Ratio Combining (CMRC), and Distributed Space-Time...
Provided by Technical University of Crete
-
White Papers
Wavelets on Streams
September 15, 2008, 12:00am PDT
Unlike conventional database query-processing engines that require several passes over a static data image, streaming data-analysis algorithms must often rely on building concise, approximate (but...
Provided by University of Crete
-
White Papers
The Discrete Wavelet Transform and Wavelet Synopses
September 15, 2008, 12:00am PDT
Wavelets are a useful mathematical tool for hierarchically decomposing functions in ways that are both efficient and theoretically sound. Broadly speaking, the wavelet transform of a function...
Provided by University of Crete
-
White Papers
Histograms and Wavelets on Probabilistic Data
October 9, 2009, 12:00am PDT
There is a growing realization that uncertain information is a first-class citizen in modern database management. As such, the authors need techniques to correctly and efficiently process...
Provided by University of Crete
-
White Papers
Indoor Positioning in Wireless LANs Using Compressive Sensing Signal-Strength Fingerprints
February 25, 2011, 12:00am PST
Accurate indoor localization is a significant task for many ubiquitous and pervasive computing applications, with numerous solutions based on IEEE802.11, Bluetooth, ultrasound and infrared...
Provided by University of Crete
-
White Papers
On Multi-Layer Game-Theoretical Modelling of Spectrum Markets and Cognitive Radio Networks
August 26, 2011, 12:00am PDT
This paper presents a powerful innovative multi-layer game theoretical modelling framework for the evolution of spectrum markets. It integrates models of the channel, client and network operator...
Provided by University of Crete
-
White Papers
Azor: Using Two-Level Block Selection to Improve SSD-Based I/O Caches
July 15, 2011, 12:00am PDT
Flash-based Solid State Drives (SSDs) exhibit potential for solving I/O bottlenecks by offering superior performance over hard disks for several workloads. In this paper, the authors design Azor,...
Provided by University of Crete
-
White Papers
Azor: Using Two-Level Block Selection to Improve SSD-Based I/O Caches
July 15, 2011, 12:00am PDT
Flash-based Solid State Drives (SSDs) exhibit potential for solving I/O bottlenecks by offering superior performance over hard disks for several workloads. In this paper, the authors design Azor,...
Provided by University of Crete
-
White Papers
On Multi-Layer Game-Theoretical Modelling of Spectrum Markets and Cognitive Radio Networks
August 26, 2011, 12:00am PDT
This paper presents a powerful innovative multi-layer game theoretical modelling framework for the evolution of spectrum markets. It integrates models of the channel, client and network operator...
Provided by University of Crete
-
White Papers
Indoor Positioning in Wireless LANs Using Compressive Sensing Signal-Strength Fingerprints
February 25, 2011, 12:00am PST
Accurate indoor localization is a significant task for many ubiquitous and pervasive computing applications, with numerous solutions based on IEEE802.11, Bluetooth, ultrasound and infrared...
Provided by University of Crete
-
White Papers
Histograms and Wavelets on Probabilistic Data
October 9, 2009, 12:00am PDT
There is a growing realization that uncertain information is a first-class citizen in modern database management. As such, the authors need techniques to correctly and efficiently process...
Provided by University of Crete
-
White Papers
The Discrete Wavelet Transform and Wavelet Synopses
September 15, 2008, 12:00am PDT
Wavelets are a useful mathematical tool for hierarchically decomposing functions in ways that are both efficient and theoretically sound. Broadly speaking, the wavelet transform of a function...
Provided by University of Crete
-
White Papers
Wavelets on Streams
September 15, 2008, 12:00am PDT
Unlike conventional database query-processing engines that require several passes over a static data image, streaming data-analysis algorithms must often rely on building concise, approximate (but...
Provided by University of Crete
-
White Papers
Experimental Investigation of Cooperative Schemes on a Real-Time DSP-Based Testbed
March 31, 2009, 12:00am PDT
Experimental results on the well-known cooperating relaying schemes, Amplify-and-Forward (AF), Detect-and-Forward (DF), Cooperative Maximum Ratio Combining (CMRC), and Distributed Space-Time...
Provided by Technical University of Crete
-
White Papers
Access Point Selection for Improving Throughput Fairness in Wireless LANs
May 8, 2007, 12:00am PDT
As wireless networks become more ubiquitous, efficient sharing of wireless resources will become increasingly important, especially since the capacity of wireless networks is at least an order of...
Provided by University of Crete
-
White Papers
Modeling Approximations for an IEEE 802.11 WLAN Under Poisson MAC-Level Arrivals
February 23, 2007, 12:00am PST
The authors examine two approximative models for the behavior of an IEEE 802.11 WLAN under Poisson MAC-level arrivals. Both models extend, in a simple manner, the analysis for saturated stations...
Provided by University of Crete
-
White Papers
A Novel Multi-Layer Framework for Modeling the Evolution of Spectrum Markets and Cognitive-Radio Devices
April 15, 2011, 12:00am PDT
This paper presents a novel multi-layer modeling framework for the evolution of spectrum markets of multiple spectrum/network operators that provide wireless access to users. It integrates models...
Provided by University of Crete
-
White Papers
Trend Forecasting Based on Singular Spectrum Analysis of Traffic Workload in a Large-Scale Wireless LAN
June 19, 2008, 12:00am PDT
Network traffic load in an IEEE802.11 infrastructure arises from the superposition of traffic accessed by wireless clients associated with Access Points (APs). An accurate load characterization...
Provided by University of Crete
-
White Papers
Analyzing the Impact of Various Wireless Network Conditions on the Perceived Quality of VoIP
April 14, 2010, 12:00am PDT
This paper focuses on a comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover and under different background traffic conditions at a...
Provided by University of Crete
-
White Papers
Empirical Evaluation of Signal-Strength Fingerprint Positioning in Wireless LANs
October 19, 2010, 12:00am PDT
This paper proposes a novel localization technique based on a multivariate Gaussian modeling of the signal strength measurements collected from several Access Points (APs) at different locations....
Provided by University of Crete
-
White Papers
On the Design of Passive RFID Tags for ASK Modulation
May 26, 2011, 12:00am PDT
Design of passive UHF RFID tag for ASK modulation is investigated. It is shown that tag antenna structural mode strongly affects the tag's backscattered field, shaping the phase and magnitude of...
Provided by Technical University of Crete
-
White Papers
A UHF Radio Frequency Identification (RFID) System for Healthcare: Design and Implementation
November 4, 2010, 12:00am PDT
This paper presents a customized design of a UHF Radio Frequency IDentification (RFID) system to be installed at the Bank Of Cyprus Oncology Center (BOCOC) in Cyprus. This is a pilot project that...
Provided by Technical University of Crete
-
White Papers
Backscattering Improvement of UHF RFID Tag Efficiency
October 27, 2009, 12:00am PDT
In this paper, a tag-load selection methodology is proposed for optimized tag-to-reader backscatter communication. Derivation of the method is based on antenna/communication theory and applies to...
Provided by Technical University of Crete
-
White Papers
Adjacent Channel Interference in 802.11a: Modeling and Testbed Validation
November 3, 2007, 12:00am PDT
In this paper, the authors utilize the model for calculation of the interference power by partially overlapping channels introduced in and combine it with the Signal to Interference plus Noise...
Provided by University of Crete
-
White Papers
Access Point Assignment Algorithms in WLANs Based on Throughput Objectives
February 11, 2008, 12:00am PST
In this paper, the authors present branch-and-bound algorithms for the access point assignment problem in WLANs, when the objective function is based on the throughput of stations in the network....
Provided by University of Crete
-
White Papers
802.11e EDCA Protocol Parameterization: A Modeling and Optimization Study
March 26, 2007, 12:00am PDT
The IEEE 802.11e MAC protocol specifies an Enhanced Distributed Channel Access (EDCA) mechanism with adjustable protocol parameters, providing differentiated access to wireless stations. The EDCA...
Provided by University of Crete
-
White Papers
Modeling Approximations for an IEEE 802.11 WLAN Under Poisson MAC-Level Arrivals
February 23, 2007, 12:00am PST
The authors examine two approximative models for the behavior of an IEEE 802.11 WLAN under Poisson MAC-level arrivals. Both models extend, in a simple manner, the analysis for saturated stations...
Provided by University of Crete
-
White Papers
A Game-Theoretical Modeling Framework for Spectrum Markets and Cognitive-Radio Devices
February 6, 2011, 12:00am PST
This paper presents a novel game-theoretical framework to model the evolution of spectrum markets that consists of multiple spectrum/network operators that provide wireless access to users. It...
Provided by University of Crete
-
White Papers
A Comparative Analysis of the Perceived Quality of VoIP Under Various Wireless Network Conditions
April 14, 2010, 12:00am PDT
This paper performs a comparative analysis of the perceived quality of (unidirectional, non-interactive) VoIP calls under various wireless network conditions (e.g., handover, high traffic demand)....
Provided by University of Crete
-
White Papers
Total Factor Productivity Growth And The Environment: A Case For Green Growth Accounting
April 1, 2007, 12:00am PDT
The authors examine whether the use of the environment, proxied by CO2 emissions, as a factor of production contributes, in addition to conventional factors of production to output growth, and...
Provided by University of Crete
-
White Papers
Multi-Level Application-Based Traffic Characterization in a Large-Scale Wireless Network
May 5, 2007, 12:00am PDT
With the increasing deployment of wireless networks, network management and configuration of wireless Access Points (APs) has become one of the main concerns of network operators. While statistics...
Provided by University of Crete
-
White Papers
Location-Based Media Sharing in a MP2P Network
October 12, 2007, 12:00am PDT
The Web and Internet have been catalysts for the creation of collaborative applications and tools. On-line collaboration has been enriched with new applications and tools for storing, sharing, and...
Provided by University of Crete
-
White Papers
Query Evaluation in P2P Systems of Taxonomy-Based Sources: Algorithms, Complexity, and Optimizations
September 19, 2007, 12:00am PDT
In this paper the authors address the problem of answering queries over a peer-to-peer system of taxonomy-based sources. A taxonomy states subsumption relationships between negation-free DNF...
Provided by University of Crete
-
White Papers
A Novel Approach for Allocating Network and It Resources Offered by Different Service Providers
November 1, 2010, 12:00am PDT
The pace of innovation in computer and networking technology allows many new IT services to emerge rapidly and often benefit from new network services that support faster connectivity and better...
Provided by University of Crete
-
White Papers
Object-Relational Database Representations for Text Indexing
June 17, 2009, 12:00am PDT
One of the distinctive features of Information Retrieval systems comparing to Database Management systems, is that they offer better compression for posting lists, resulting in better I/O...
Provided by University of Crete
-
White Papers
Design and Implementation of a Trust-Aware Routing Protocol for Large WSNs
July 1, 2010, 12:00am PDT
The domain of Wireless Sensor Networks (WSNs) applications is increasing widely over the last few years. As this new type of networking is characterized by severely constrained node resources,...
Provided by Technical University of Crete
-
White Papers
Querying XML Data With SPARQL
January 31, 2010, 12:00am PST
SPARQL is today the standard access language for Semantic Web data. In the recent years XML databases have also acquired industrial importance due to the widespread applicability of XML in the...
Provided by Technical University of Crete
-
White Papers
Analysis of the Perceived VoIP Quality Under Various Wireless Network Conditions
February 26, 2010, 12:00am PST
This paper focuses on the comparative statistical analysis of the performance of VoIP calls under various situations, namely, during a handover, under different background traffic conditions...
Provided by Technical University of Crete
-
White Papers
Architecture of a Network Monitoring Element
July 27, 2006, 12:00am PDT
A Network Monitoring system is a vital component of a Grid; however, its scalability is a challenge. This paper proposes a network monitoring approach that combines passive monitoring, a domain...
Provided by Technical University of Crete
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