University of Ioannina

Displaying 1-12 of 12 results

  • White Papers // Sep 2011

    Cross-Layer Routing for Peer Database Querying Over Mobile Ad Hoc Networks

    The widespread of mobile ad-hoc networking calls for a careful design of network functions in order to meet the application requirements and economize on the limited resources. In this paper, the authors address the problem of distributing query messages among peers in mobile ad hoc networks. They assume that peers...

    Provided By University of Ioannina

  • White Papers // Sep 2011

    RangeMerge: Online Performance Tradeoffs in NoSQL Datastores

    Datastores are distributed systems that manage enormous amounts of structured data for online serving and batch processing applications. The NoSQL datastores weaken the traditional relational and transactional model in favor of horizontal scalability. They usually support concurrent operations with demanding throughput and latency requirements which may vary across different workload...

    Provided By University of Ioannina

  • White Papers // Aug 2011

    Macro-level Scheduling of ETL Workflows

    Extract-Transform-Load (ETL) work-flows extract data from various sources, transform, cleanse and homogenize these data, and populate a target data store (e.g., a data warehouse). Typically, such processes should terminate during strict time windows and thus, ETL work ow optimization is of significant interest. In this paper, the authors deal with...

    Provided By University of Ioannina

  • White Papers // Jun 2011

    Okeanos: Wasteless Journaling for Fast and Reliable Multistream Storage

    Synchronous small writes play a critical role in the reliability and availability of file systems and applications that use them to safely log recent state modifications and quickly recover from failures. However, storage stacks usually enforce page-sized granularity in their data transfers from memory to disk. The authors experimentally show...

    Provided By University of Ioannina

  • White Papers // Jan 2011

    eXO: Decentralized Autonomous Scalable Social Networking

    Social networks have been receiving increasingly greater attention. As they stand now, users are required to upload their content to make it available to others. Typically, this involves releasing ownership and control. As a result, battles have begun regarding the ownership, exploitation, and control of content between users and social...

    Provided By University of Ioannina

  • White Papers // Oct 2010

    Nonlinearity And Inflation Rate Differential Persistence: Evidence From The Eurozone

    The authors employ a linear unit root test as well as a nonlinear two-regime Threshold AutoRegressive (TAR) unit root test to determine whether inflation differentials in the Eurozone during the period 1970-2009 were persistent or transitory. The results imply that inflation rate differentials in the Eurozone are characterized by threshold...

    Provided By University of Ioannina

  • White Papers // Apr 2010

    Nepheli: Scalable Decentralized Authorization in Federated File Services

    The authors consider the problem of remote access control in federated file services across independent administrative domains. Existing approaches either establish complex trust relationships between distinct domains or require frequent update operations among different authentication and authorization services. In order to improve the manageability and scalability of current solutions, they...

    Provided By University of Ioannina

  • White Papers // Jan 2010

    HECATAEUS: Regulating Schema Evolution

    HECATAEUS is an open-source software tool for enabling impact prediction, what-if analysis, and regulation of relational database schema evolution. The authors follow a graph theoretic approach and represent database schemas and database constructs, like queries and views, as graphs. Their tool enables the user to create hypothetical evolution events and...

    Provided By University of Ioannina

  • White Papers // Sep 2009

    The New Food Safety Standard ISO 22000. Assessment, Comparison And Correlation With HACCP And ISO 9000:2000. The Practical Implementation In Victual Business

    The present paper aims to study the application of new standard of food safety: ISO 22000:2005 in the catering industry. At the beginning the study made a comparison between ISO 22000 with the HACCP system and the ISO 9000:2000 standard, in order to identify their similarities and differences, while it...

    Provided By University of Ioannina

  • White Papers // Aug 2009

    Benchmarking ETL Workflows

    Extraction-Transform-Load (ETL) processes comprise complex data work-flows, which are responsible for the maintenance of a Data Warehouse. A plethora of ETL tools is currently available constituting a multi-million dollar market. Each ETL tool uses its own technique for the design and implementation of an ETL work-flow, making the task of...

    Provided By University of Ioannina

  • White Papers // Aug 2009

    Near Real Time ETL

    Near real time ETL deviates from the traditional conception of data warehouse refreshment, which is performed off-line in a batch mode, and adopts the strategy of propagating changes that take place in the sources towards the data warehouse to the extent that both the sources and the warehouse can sustain...

    Provided By University of Ioannina

  • White Papers // Jun 2009

    Queuing Theory Based Models for Studying Intrusion Evolution and Elimination in Computer Networks

    This paper presents two virus propagation and elimination models that take into account the traffic and server characteristics of the network computers. The first of these models partitions the network nodes into perimeter and non-perimeter nodes. Incoming/ outgoing traffic of the network passes through the perimeter of the network, where...

    Provided By University of Ioannina

  • White Papers // Jan 2010

    HECATAEUS: Regulating Schema Evolution

    HECATAEUS is an open-source software tool for enabling impact prediction, what-if analysis, and regulation of relational database schema evolution. The authors follow a graph theoretic approach and represent database schemas and database constructs, like queries and views, as graphs. Their tool enables the user to create hypothetical evolution events and...

    Provided By University of Ioannina

  • White Papers // Aug 2009

    Benchmarking ETL Workflows

    Extraction-Transform-Load (ETL) processes comprise complex data work-flows, which are responsible for the maintenance of a Data Warehouse. A plethora of ETL tools is currently available constituting a multi-million dollar market. Each ETL tool uses its own technique for the design and implementation of an ETL work-flow, making the task of...

    Provided By University of Ioannina

  • White Papers // Jun 2009

    Queuing Theory Based Models for Studying Intrusion Evolution and Elimination in Computer Networks

    This paper presents two virus propagation and elimination models that take into account the traffic and server characteristics of the network computers. The first of these models partitions the network nodes into perimeter and non-perimeter nodes. Incoming/ outgoing traffic of the network passes through the perimeter of the network, where...

    Provided By University of Ioannina

  • White Papers // Jan 2011

    eXO: Decentralized Autonomous Scalable Social Networking

    Social networks have been receiving increasingly greater attention. As they stand now, users are required to upload their content to make it available to others. Typically, this involves releasing ownership and control. As a result, battles have begun regarding the ownership, exploitation, and control of content between users and social...

    Provided By University of Ioannina

  • White Papers // Oct 2010

    Nonlinearity And Inflation Rate Differential Persistence: Evidence From The Eurozone

    The authors employ a linear unit root test as well as a nonlinear two-regime Threshold AutoRegressive (TAR) unit root test to determine whether inflation differentials in the Eurozone during the period 1970-2009 were persistent or transitory. The results imply that inflation rate differentials in the Eurozone are characterized by threshold...

    Provided By University of Ioannina

  • White Papers // Sep 2009

    The New Food Safety Standard ISO 22000. Assessment, Comparison And Correlation With HACCP And ISO 9000:2000. The Practical Implementation In Victual Business

    The present paper aims to study the application of new standard of food safety: ISO 22000:2005 in the catering industry. At the beginning the study made a comparison between ISO 22000 with the HACCP system and the ISO 9000:2000 standard, in order to identify their similarities and differences, while it...

    Provided By University of Ioannina

  • White Papers // Sep 2011

    Cross-Layer Routing for Peer Database Querying Over Mobile Ad Hoc Networks

    The widespread of mobile ad-hoc networking calls for a careful design of network functions in order to meet the application requirements and economize on the limited resources. In this paper, the authors address the problem of distributing query messages among peers in mobile ad hoc networks. They assume that peers...

    Provided By University of Ioannina

  • White Papers // Jun 2011

    Okeanos: Wasteless Journaling for Fast and Reliable Multistream Storage

    Synchronous small writes play a critical role in the reliability and availability of file systems and applications that use them to safely log recent state modifications and quickly recover from failures. However, storage stacks usually enforce page-sized granularity in their data transfers from memory to disk. The authors experimentally show...

    Provided By University of Ioannina

  • White Papers // Apr 2010

    Nepheli: Scalable Decentralized Authorization in Federated File Services

    The authors consider the problem of remote access control in federated file services across independent administrative domains. Existing approaches either establish complex trust relationships between distinct domains or require frequent update operations among different authentication and authorization services. In order to improve the manageability and scalability of current solutions, they...

    Provided By University of Ioannina

  • White Papers // Sep 2011

    RangeMerge: Online Performance Tradeoffs in NoSQL Datastores

    Datastores are distributed systems that manage enormous amounts of structured data for online serving and batch processing applications. The NoSQL datastores weaken the traditional relational and transactional model in favor of horizontal scalability. They usually support concurrent operations with demanding throughput and latency requirements which may vary across different workload...

    Provided By University of Ioannina

  • White Papers // Aug 2009

    Near Real Time ETL

    Near real time ETL deviates from the traditional conception of data warehouse refreshment, which is performed off-line in a batch mode, and adopts the strategy of propagating changes that take place in the sources towards the data warehouse to the extent that both the sources and the warehouse can sustain...

    Provided By University of Ioannina

  • White Papers // Aug 2011

    Macro-level Scheduling of ETL Workflows

    Extract-Transform-Load (ETL) work-flows extract data from various sources, transform, cleanse and homogenize these data, and populate a target data store (e.g., a data warehouse). Typically, such processes should terminate during strict time windows and thus, ETL work ow optimization is of significant interest. In this paper, the authors deal with...

    Provided By University of Ioannina