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National Technical University of Athens
(90 results)-
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Mobile E-Commerce and Location-Based Services: Technology and Requirements
April 15, 2003, 12:00am PDT
Advances in Internet and network technology and the rapidly growing number of mobile personal devices result in the fast growth of Mobile E-Commerce, M-Commerce. This paper views M-Commerce as...
Provided by University of Athens
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Visualizing Multidimensional Data Through Granularity-Dependent Spatialization
October 15, 2009, 12:00am PDT
Spatialization is a special kind of visualization that projects multidimensional data into low-dimensional representational spaces by making use of spatial metaphors. Spatialization methods face a...
Provided by National Technical University of Athens
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An Expert Systems Methodology For Equity Selection Using Financial Analysis
August 19, 2008, 12:00am PDT
In this paper the authors' present expert systems methodology for supporting decisions that concern the selection of equities, on the basis of financial analysis. The proposed methodology is...
Provided by National Technical University of Athens
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An Integrated Mobile Mapping System for Data Acquisition and Automated Asset Extraction
November 7, 2007, 12:00am PST
In recent years, public and private organizations worldwide are facing a continuously increasing demand to build and maintain the asset inventory of their infrastructure network. This is due to...
Provided by National Technical University of Athens
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Design Issues for Videoconferencing in Earth and Life Sciences: The Case of the Agricultural University of Athens
December 18, 2007, 12:00am PST
In Earth and Life Science courses such as agricultural, environmental and biomedical courses teaching and learning conditions and requirements present certain peculiarities. In this paper, the...
Provided by Agricultural University Of Athens
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Security Measures and Weaknesses of the GPRS Security Architecture
March 1, 2008, 12:00am PST
This paper presents an evaluation of the security architecture employed in the General Packet Radio Services (GPRS). More specifically, the security measures applied to protect the mobile users,...
Provided by University of Athens
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Serial Free-Space Optical Relaying Communications Over Gamma-Gamma Atmospheric Turbulence Channels
June 3, 2010, 12:00am PDT
In this paper, a study on the end-to-end performance of multi-hop free-space optical wireless systems over turbulence induced fading channels, modeled by the gamma-gamma distribution, is...
Provided by University of Athens
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On Quality of Service Support for Grid Computing
May 31, 2007, 12:00am PDT
Computing Grids are hardware and software infrastructures that sup-port secure sharing and concurrent access to distributed services by a large number of competing users from different Virtual...
Provided by University of Athens
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Redesigning the Open Mobile Alliance License Choice Algorithm
February 8, 2011, 12:00am PST
Open Mobile Alliance (OMA) is an organization that is responsible for the creation of standards (among others) for the Mobile DRM systems and consists of some of most major mobile phone...
Provided by National Technical University of Athens
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Selling Culture: Implementation of e-Commerce and WAP-Based Prototypes
December 20, 2010, 12:00am PST
Museum stores represent integral parts of the museums that have also a lot to benefit from a successful presence on the web arena. In addition to traditional web sites, carefully designed...
Provided by University of Athens
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Gossip-Based Search in Multipeer Communication Networks
July 15, 2009, 12:00am PDT
The authors study a gossip-based algorithm for searching data objects in a multipeer communication network. All of the nodes in the network are able to communicate with each other. There exists an...
Provided by University of Athens
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A Model Predictive Control and Time Series Forecasting Framework for Supply Chain Management
June 9, 2009, 12:00am PDT
Model Predictive Control has been previously applied to supply chain problems with promising results; however hitherto proposed systems possessed no information on future demand. A forecasting...
Provided by National Technical University of Athens
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Demand and Price Evolution Forecasting as Tools for Facilitating the RoadMapping Process of the Photonic Component Industry
June 9, 2009, 12:00am PDT
The photonic component industry is a highly innovative industry with a large value chain. In order to ensure the growth of the industry much effort must be devoted to road mapping activities. In...
Provided by University of Athens
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E-Government and Interoperability Issues
September 1, 2007, 12:00am PDT
Governments worldwide adopt e-government model and use ICT and particularly the Web as a key vehicle. This means the full integration of new technologies for transforming the public...
Provided by University of Athens
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Rank-Aware Crawling of Hidden Web Sites
June 12, 2011, 12:00am PDT
An ever-increasing amount of valuable information on the Web today is stored inside online databases and is accessible only after the users issue a query through a search interface. Such...
Provided by University of Athens
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Custom Microcoded Dynamic Memory Management for Distributed On-Chip Memory Organizations
February 24, 2011, 12:00am PST
Multi-Processor System-on-Chip (MPSoCs) have attracted significant attention since they are recognized as a scalable paradigm to interconnect and organize a high number of cores. Current...
Provided by National Technical University of Athens
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Mobility Management and QoS Support in Wireless Environments: Trends and Open issues
July 4, 2009, 12:00am PDT
For quite some time researchers were trying to find viable means to support the quality of services for fixed IP users. This was a difficult task and even up until today there is no universally...
Provided by University of Athens
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A Semantics-Aware Platform for Interactive TV Services
July 26, 2007, 12:00am PDT
Interactive digital TV is becoming a reality throughout the globe. The most important part of the picture is new services for the user, in terms of audio-video quality, but mostly in terms of...
Provided by University of Athens
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Integrating Semantic Technologies With Interactive Digital TV
April 17, 2008, 12:00am PDT
Interactive digital TV is becoming a reality throughout the globe. The most essential aspect of TV broadcasting is enhancing the interacting experience for the viewer. To this end, the authors...
Provided by University of Athens
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Performance Evaluation of OFDMA Techniques in Multicellular Networks
June 24, 2008, 12:00am PDT
Orthogonal Frequency Division Multiple Access (OFDMA) techniques are investigated in this paper. Five sub channel allocation algorithms are analysed and their performance in a multicellular...
Provided by University of Athens
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Performance Analysis of TDMA MAC Schemes for Ad-Hoc Networks With Topology Control
January 1, 2011, 12:00am PST
Traditional omni-directional antennas result in increased mutliuser interference and are known to limit the performance of Medium Access Control (MAC) protocols for ad-hoc networks. Topology...
Provided by University of Athens
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A Framework for Preserving User Privacy and Ensuring QoS in Location Based Services Using Non-Irreversible Algorithm
April 1, 2009, 12:00am PDT
In this paper, the authors address the issue of preserving user privacy in location based services provisioning. This issue includes two controversial requirements, namely the protection of user's...
Provided by National Technical University of Athens
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Whitepapers
Towards Cognitive B3G Networks: Autonomic Management of Access Points
May 31, 2007, 12:00am PDT
The heterogeneity and complexity of B3G wireless infrastructures dictates the need for novel functionality, in order to deliver enhanced services and meet user requirements. Cognitive networks...
Provided by National Technical University of Athens
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Whitepapers
On the Hardness of Network Design for Bottleneck Routing Games
July 22, 2012, 12:00am PDT
In routing games, the selfish behavior of the players may lead to a degradation of the network performance at equilibrium. In more than a few cases however, the equilibrium performance can be...
Provided by National Technical University of Athens
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Whitepapers
Self-Stabilizing Balancing Algorithm for Containment-Based Trees
December 14, 2012, 12:00am PST
Containment-based trees encompass various handy structures such as B+-trees, R-trees and M-trees. They are widely used to build data indexes, range-queryable overlays, publish/subscribe systems...
Provided by National Technical University of Athens
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Whitepapers
Characteristics of Video Traffic From Videoconference Applications: From H.261 to H.264
December 3, 2012, 12:00am PST
This paper presents modeling results for H.26x video traffic generated by popular videoconference software applications. The analysis of videoconference data that were measured during realistic...
Provided by National Technical University of Athens
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Whitepapers
On a CCA2-Secure Variant of McEliece in the Standard Model
July 18, 2012, 12:00am PDT
The McEliece cryptosystem is the first scheme based on coding theory problems and it makes use of error-correcting codes (binary Goppa codes in the original proposal). It is possible to produce...
Provided by University of Athens
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Whitepapers
Propagation Measurements inside a B737 Aircraft for In-Cabin Wireless Networks
April 15, 2008, 12:00am PDT
In this paper, the authors present a measurement campaign conducted inside a Boeing 737-400 aircraft for the development of in-cabin wireless networks. The measurements were conducted in three...
Provided by National Technical University of Athens
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Simulations for WDM Mesh Networks With Visual Basic
June 14, 2011, 12:00am PDT
Fully optical fiber networks that transmit large quantities of information due to multiple applications or because they serve large urban areas (big and small local telephone exchanges), need to...
Provided by University of Athens
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System-Level Virtualization and Mobile IP to Support Service Mobility
June 19, 2009, 12:00am PDT
In many areas of ICT the use of virtualization techniques has decoupled the binding between physical resources and functional roles assigned to them. While the use of virtualization in computing...
Provided by University of Athens
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A Message-Optimal Sink Mobility Model for Wireless Sensor Networks
April 9, 2008, 12:00am PDT
The paper proposes an algorithm for collecting data from a wireless sensor network modeled as a random geometric graph in the unit square. The sensors are supposed to work in an asynchronous...
Provided by University of Athens
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A Characterization of Maximum Entropy Spatially Correlated Wireless Channel Models
October 10, 2008, 12:00am PDT
The authors consider the use of entropy maximization methods as a tool to generate fading models for Multiple-Input Multiple-Output (MIMO) spatially correlated flat-fading channels. They focus in...
Provided by University of Athens
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Price Cap Effect In The Performance Of Greek IPOs
November 20, 2007, 12:00am PST
The Initial Public Offerings (IPOs) pricing has become a leading example of market inefficiency during the last decades. Although there is an extensive amount of work that provides some evidence...
Provided by University of Athens
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Value of Information Exposed: Wireless Networking Solutions to the Parking Search Problem
December 10, 2010, 12:00am PST
The authors' work draws on a concrete parking space search application to explore fundamental tradeoffs of wireless networking solutions to the provision of real-life services. In particular, they...
Provided by University of Athens
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Minimizing Node Churn in Peer-to-Peer Streaming
April 15, 2010, 12:00am PDT
Several Peer-To-Peer (P2P) streaming systems have proved by now their ability to deliver live video streams to hundreds of users. However the inherent instability of the distribution environment...
Provided by University of Athens
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MAD: A Dynamically Adjustable Hybrid Location-And Motion-Based Routing Protocol for VANETs
July 26, 2010, 12:00am PDT
This paper proposes a routing protocol that jointly exploits location and motion information in a dynamically adjusted way, towards self-adaptability in different combinations of mobility and node...
Provided by University of Athens
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Scalable Distributed Service Migration Via Complex Networks Analysis
January 27, 2011, 12:00am PST
With social networking sites providing increasingly richer context, user-centric service creation is expected to follow a similar growth with User-Generated Content. The what-is-often-called User...
Provided by University of Athens
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Sink Mobility Schemes for Data Extraction in Large Scale WSNs Under Single or Zero Hop Data Forwarding
February 20, 2010, 12:00am PST
A mobile sink is widely considered to facilitate the data collection from energy constrained sensor fields, by having the sink come close to the sensors and conserving precious sensor node energy....
Provided by University of Athens
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Efficient Social-Aware Content Placement in Opportunistic Networks
December 13, 2009, 12:00am PST
As content provisioning becomes the driving application of today's (opportunistic) networking environments and the user generated content explodes, the problem of devising scalable approaches to...
Provided by University of Athens
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Study of Randomly Replicated Random Walks for Information Dissemination Over Various Network Topologies
December 6, 2008, 12:00am PST
Information dissemination is important to the robustness or functionality of modern, highly dynamic and of large scale networking environments. Depending on its nature the disseminated information...
Provided by University of Athens
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Whitepapers
Propagation Measurements inside a B737 Aircraft for In-Cabin Wireless Networks
April 15, 2008, 12:00am PDT
In this paper, the authors present a measurement campaign conducted inside a Boeing 737-400 aircraft for the development of in-cabin wireless networks. The measurements were conducted in three...
Provided by National Technical University of Athens
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Whitepapers
On a CCA2-Secure Variant of McEliece in the Standard Model
July 18, 2012, 12:00am PDT
The McEliece cryptosystem is the first scheme based on coding theory problems and it makes use of error-correcting codes (binary Goppa codes in the original proposal). It is possible to produce...
Provided by University of Athens
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Whitepapers
Characteristics of Video Traffic From Videoconference Applications: From H.261 to H.264
December 3, 2012, 12:00am PST
This paper presents modeling results for H.26x video traffic generated by popular videoconference software applications. The analysis of videoconference data that were measured during realistic...
Provided by National Technical University of Athens
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Whitepapers
Self-Stabilizing Balancing Algorithm for Containment-Based Trees
December 14, 2012, 12:00am PST
Containment-based trees encompass various handy structures such as B+-trees, R-trees and M-trees. They are widely used to build data indexes, range-queryable overlays, publish/subscribe systems...
Provided by National Technical University of Athens
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Whitepapers
On the Hardness of Network Design for Bottleneck Routing Games
July 22, 2012, 12:00am PDT
In routing games, the selfish behavior of the players may lead to a degradation of the network performance at equilibrium. In more than a few cases however, the equilibrium performance can be...
Provided by National Technical University of Athens
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Whitepapers
Towards Cognitive B3G Networks: Autonomic Management of Access Points
May 31, 2007, 12:00am PDT
The heterogeneity and complexity of B3G wireless infrastructures dictates the need for novel functionality, in order to deliver enhanced services and meet user requirements. Cognitive networks...
Provided by National Technical University of Athens
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Whitepapers
Service Composition: State of the Art and Future Challenges
August 29, 2007, 12:00am PDT
Service discovery and service composition constitute challenging tasks of service provisioning. Service composition is especially gaining on importance, as it can produce new composite services...
Provided by National Technical University of Athens
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Measuring the Cost of Online Load-Balancing in Distributed Range-Queriable Systems
June 25, 2009, 12:00am PDT
Data skew is a well-documented concern for a variety of applications. For instance, it has been widely observed that most Internet-scale applications, including P2P ones, exhibit highly skewed...
Provided by University of Athens
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Efficient Updates for Web-Scale Indexes Over the Cloud
December 20, 2011, 12:00am PST
In this paper, the authors present a distributed system which enables fast and frequent updates on web-scale Inverted Indexes. The proposed update technique allows incremental processing of new or...
Provided by University of Athens
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Publish/Subscribe Over Information Centric Networks: A Standardized Approach in CONVERGENCE
June 22, 2012, 12:00am PDT
Originally conceived as a "Network of hosts", the Internet is evolving into an Internet of services, an Internet of media, an Internet of people and an Internet of "Things". This implies a...
Provided by National Technical University of Athens
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Coverage and Capacity Optimization of Self-Managed Future Internet Wireless Networks
September 17, 2010, 12:00am PDT
Future Internet network management systems are expected to incorporate self-x capabilities in order to tackle the increased management needs that cannot be addressed through human intervention....
Provided by University of Athens
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Feedback-Based Learning for Self-Managed Network Elements
March 1, 2011, 12:00am PST
Autonomic network management systems will operate in a volatile network environment; thus they should be able to continuously adapt their decision making mechanism through learning from the...
Provided by University of Athens
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The E3 Architecture for Future Cognitive Mobile Networks
June 15, 2009, 12:00am PDT
Next generation mobile and wireless systems will enhance the operators' network management capabilities and will considerably improve the users' experience. However, these systems form a complex...
Provided by University of Athens
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A Proof of Concept Environment for Cognitive and Self-X Functionalities
June 2, 2010, 12:00am PDT
The recent explosion in the range and capabilities of wireless communications devices is perhaps unequalled in history. Therefore there is a need for introduction of new approaches that tackle the...
Provided by University of Athens
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Non-Cooperative Dynamic Spectrum Access for CDMA Networks
August 8, 2007, 12:00am PDT
Recent studies indicate the presence of a significant amount of idle licensed spectrum, in different time periods and geographic locations. Prompted by the latest regulatory changes and radio...
Provided by University of Athens
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Efficient and Adaptive Distributed Skyline Computation
April 15, 2010, 12:00am PDT
Skyline queries have attracted considerable attention over the last few years, mainly due to their ability to return interesting objects without the need for user-defined scoring functions. In...
Provided by University of Athens
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A High-Level Mapping Algorithm Targeting 3D NoC Architectures With Multiple Vdd
April 28, 2010, 12:00am PDT
The communication problem in modern ICs becomes a challenge issue. This paper introduces a high-level mapping algorithm targeting to low-power 3D NoC devices. By appropriately assigning...
Provided by National Technical University of Athens
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A Heterogeneous Multicore System on Chip With Run-Time Reconfigurable Virtual FPGA Architecture
December 19, 2010, 12:00am PST
System design, especially for low power embedded applications often profit from a heterogeneous target hardware platform. The application can be partitioned into modules with specific...
Provided by National Technical University of Athens
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A Methodology and Tool Framework for Supporting Rapid Exploration of Memory Hierarchies in FPGAs
December 24, 2010, 12:00am PST
This paper introduces a novel methodology for enabling rapid exploration of memory hierarchies onto FPGA devices. The methodology is software supported by a new open-source tool framework, named...
Provided by National Technical University of Athens
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Quick Hotspot: A Software Supported Methodology for Supporting Run-Time Thermal Analysis at MPSoC Designs
January 13, 2011, 12:00am PST
Detailed thermal analysis and exploration has recently received significant attention since it is straightforward-related to numerous reliability issues. Furthermore, thermal profiling is a...
Provided by National Technical University of Athens
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Thermal Optimization for Micro-Architectures Through Selective Block Replication
May 19, 2011, 12:00am PDT
Increased power densities result to higher on-chip temperatures, which in turn creates numerous problems tightly firmed to reliability issues. This problem is expected to become even more severe...
Provided by National Technical University of Athens
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Trading Fault-Masking With Performance Overhead for FPGAs
January 18, 2011, 12:00am PST
Reliability issues become an important design concern with technology scaling. This paper introduces a novel methodology for balancing the desired fault masking and the consequence delay and power...
Provided by National Technical University of Athens
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A Framework for Enabling Fault Tolerance in Reconfigurable Architectures
December 19, 2009, 12:00am PST
Fault tolerance is a pre-request not only for safety critical systems, but almost for the majority of applications. However, the additional hardware elements impose performance degradation. In...
Provided by National Technical University of Athens
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Towards Supporting Fault-Tolerance in FPGAs
April 28, 2010, 12:00am PDT
This paper proposes a novel methodology for improving reliability of FPGAs without requiring special purpose hardware. In contrast to related approaches that are applied uniformly over the target...
Provided by National Technical University of Athens
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Fault-Free: A Framework for Supporting Fault Tolerance in FPGAs
November 16, 2009, 12:00am PST
In this paper, the authors propose a novel methodology for supporting application mapping onto FPGAs with fault tolerance even if this feature is not supported by the target platform. For the...
Provided by National Technical University of Athens
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A Novel Methodology for Exploring Interconnection Architectures Targeting 3-D FPGAs
December 24, 2008, 12:00am PST
In current reconfigurable architectures the interconnection structures increasingly contribute more to the delay and power consumption. The demand for increased clock frequencies and logic density...
Provided by National Technical University of Athens
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System-Level Exploration of 3-D Interconnection Schemes
November 7, 2008, 12:00am PST
3-D chip stacking is the big next step in system integration. Even though the process technology is maturing, many issues related to system implementation are not fully understood yet....
Provided by National Technical University of Athens
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A Software-Supported Methodology for Exploring Interconnection Architectures Targeting 3-D FPGAs
January 21, 2009, 12:00am PST
Interconnect structures significantly contribute to the delay, power consumption, and silicon area of modern reconfigurable architectures. The demand for higher clock frequencies and logic...
Provided by National Technical University of Athens
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A Novel Methodology for Architecture-Level Exploration of 3D SoCs
May 8, 2011, 12:00am PDT
Three-Dimensional (3D) integration is an emerging technology that is expected to lead to tremendous benefits in terms of power, delay and silicon area. Moreover, 3D technology continues...
Provided by National Technical University of Athens
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Improved rtPS Scheduling With QoE Metrics in Joint WiMAX/Satellite Networks
January 6, 2012, 12:00am PST
This paper improves a previously proposed scheduling algorithm that is responsible to share the allocated capacity to the up-link traffic of an integrated satellite and WiMAX network. The target...
Provided by University of Athens
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Query Answering Over SROIQ Knowledge Bases With SPARQL
June 20, 2011, 12:00am PDT
W3C currently extends the SPARQL query language with so-called entailment regimes, which define how queries are evaluated using logical entailment relations. The authors describe a sound and...
Provided by National Technical University of Athens
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Efficient Semantic Web Service Discovery in Centralized and P2P Environments
July 22, 2008, 12:00am PDT
Efficient and scalable discovery mechanisms are critical for enabling service-oriented architectures on the Semantic Web. The majority of currently existing approaches focuses on centralized...
Provided by National Technical University of Athens
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Topologically Sorted Skylines for Partially Ordered Domains
November 20, 2008, 12:00am PST
The vast majority of work on skyline queries considers totally ordered domains, whereas in many applications some attributes are partially ordered, as for instance, domains of set values,...
Provided by National Technical University of Athens
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Evaluating Reachability Queries Over Path Collections
April 13, 2009, 12:00am PDT
Several applications in areas such as biochemistry, GIS, involve storing and querying large volumes of sequential data stored as path collections. There is a number of interesting queries that can...
Provided by National Technical University of Athens
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Rule-Based Management of Schema Changes at ETL Sources
October 14, 2009, 12:00am PDT
In this paper, the authors visit the problem of the management of inconsistencies emerging on ETL processes as results of evolution operations occurring at their sources. They abstract...
Provided by National Technical University of Athens
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Policy-Regulated Management of ETL Evolution
November 29, 2009, 12:00am PST
In this paper, the authors discuss the problem of performing impact prediction for changes that occur in the schema/structure of the data warehouse sources. They abstract Extract-Transform-Load...
Provided by National Technical University of Athens
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Ontology-Driven Conceptual Design of ETL Processes Using Graph Transformations
November 29, 2009, 12:00am PST
One of the main tasks during the early steps of a data warehouse project is the identification of the appropriate transformations and the specification of inter-schema mappings from the source to...
Provided by National Technical University of Athens
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Data Fusion Algorithms for Network Anomaly Detection: Classification and Evaluation
January 18, 2008, 12:00am PST
In this paper, the problem of discovering anomalies in a large-scale network based on the data fusion of heterogeneous monitors is considered. The authors present a classification of anomaly...
Provided by National Technical University of Athens
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Clustering XML Documents by Structure
January 1, 2012, 12:00am PST
This paper explores the application of clustering methods for grouping structurally similar XML documents. Modeling the XML documents as rooted ordered labeled trees, they apply clustering...
Provided by National Technical University of Athens
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A Front-End, Hadoop-Based Data Management Service for Efficient Federated Clouds
October 6, 2011, 12:00am PDT
In the recent years, cloud computing has emerged as the new IT paradigm that promises elastic resources on a pay-per-use basis. The challenges of cloud computing are focused around massive data...
Provided by University of Athens
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