Vienna University of Economics and Business

Displaying 1-40 of 159 results

  • White Papers // Jan 2014

    General-Purpose Graphics Processing Units in Service-Oriented Architectures

    Over the last decades, graphics processing units have developed from special-purpose graphics accelerators to general-purpose massively parallel co-processors. In recent years they gained increased traction in high performance computing, as they provide superior computational performance in terms of runtime and energy consumption for a wide range of problems. In this...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2013

    A Framework and Middleware for Application-Level Cloud Bursting on Top of Infrastructure-as-a-Service Clouds

    A core idea of cloud computing is elasticity, i.e., enabling applications to adapt to varying load by dynamically acquiring and releasing cloud resources. One concrete realization is cloud bursting, which is the migration of applications or parts of applications running in a private cloud to a public cloud to cover...

    Provided By Vienna University of Economics and Business

  • White Papers // Jul 2013

    Dowsing for Overflows: A Guided Fuzzer to Find Buffer Boundary Violations

    Dowser is a 'Guided' fuzzer that combines taint tracking, program analysis and symbolic execution to find buffer overflow and underflow vulnerabilities buried deep in a program's logic. The key idea is that analysis of a program lets the users pinpoint the right areas in the program code to probe and...

    Provided By Vienna University of Economics and Business

  • White Papers // Jul 2013

    Interactive Visual Transformation for Symbolic Representation of Time-oriented Data

    Data mining on time-oriented data has many real-world applications, like optimizing shift plans for shops or hospitals, or analyzing traffic or climate. As those data are often very large and multi-variate, several methods for symbolic representation of time-series have been proposed. Some of them are statistically robust, have a lower-bound...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2013

    Evolving Graph Databases Under Description Logic Constraints

    In the setting of graph-structured data, description logics are well suited to impose constraints that capture the semantics of the do-main of interest. When the data evolves as a result of operations carried out by users or applications, it is important to ensure that the satisfaction of the constraints is...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2013

    RESTful Business Process Management in the Cloud

    As more and more business processes are migrated into cloud-based runtimes, there is a need to manage their state to provide support for quality attributes such as elasticity, scalability and dependability. In this paper, the authors discuss how the REST architectural style provides a sensible choice to manage and publish...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2013

    SOA Model for High Availability of Services

    Service-Oriented Architecture (SOA) provides reusability and enables easy functionality integration. Service availability in SOA is important as it is used by safety critical systems, telecommunication systems and business systems. Service unavailability can result in reduced profits, reputation damage and reduced safety. Machine virtualization, clusters and group communication systems are used...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2013

    Minimum Variance Estimation of a Sparse Vector Within the Linear Gaussian Model: An RKHS Approach

    The authors consider minimum variance estimation within the Sparse Linear Gaussian Model (SLGM). A sparse vector is to be estimated from a linearly transformed version embedded in Gaussian noise. Their analysis is based on the theory of Reproducing Kernel Hilbert Spaces (RKHS). After a characterization of the RKHS associated with...

    Provided By Vienna University of Economics and Business

  • White Papers // Mar 2013

    Efficient Updates of Uncertain Databases

    Uncertain databases have evolved as an active area of database research, surveyed, for example, in. The possible world's semantics is commonly used to deal with uncertain data. Several representation systems for uncertain data-bases have been proposed to provide efficient storage and query facilities for a potentially big number of possible...

    Provided By Vienna University of Economics and Business

  • White Papers // Mar 2013

    Toward a Cloud-Based Integration of IR Tools

    In this paper, the authors present the case for creating a cloud-based infrastructure for IR. The infrastructure should provide access to multiple components of IR systems and a method to easily integrate them in various configurations, as well as data and parameters used in IR experiments. Workflow tools are promising...

    Provided By Vienna University of Economics and Business

  • White Papers // Mar 2013

    Securing a Space-Based Service Architecture With Coordination-Driven Access Control

    In distributed applications, multiple autonomous processes need to collaborate in an efficient way. Space-based middleware enables data-driven coordination for these processes via shared tuple spaces that allow a decoupled form of communication. Complex coordination logic may be provided to clients via reusable service components that access such tuple spaces to...

    Provided By Vienna University of Economics and Business

  • White Papers // Mar 2013

    dAnubis - Dynamic Device Driver Analysis Based on Virtual Machine Introspection

    In the escalating arms race between malicious code and security tools designed to analyze it, detect it or mitigate its impact, malicious code running inside the operating system kernel provides an extremely powerful tool. Kernel-level code can introduce hard to detect backdoors, provide stealth by hiding les, processes or other...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2013

    M2M Platform-as-a-Service for Sustainability Governance

    Recently, cloud computing technologies have been employed for large-scale Machine-To-Machine (M2M) systems, as they could potentially offer better solutions for managing monitoring data and analytics applications to support the needs of different consumers. However, there exist complex relationships between monitored objects, monitoring data, analysis features, and stakeholders in M2M that...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2013

    Application-Level Performance Monitoring of Cloud Services Based on the Complex Event Processing Paradigm

    Monitoring of applications deployed to Infrastructure-as-a-Service clouds is still an open problem. In this paper, the authors discuss an approach based on the complex event processing paradigm, which allows application developers to specify and monitor high-level application performance metrics. They use the case of a Web 2.0 sentiment analysis application...

    Provided By Vienna University of Economics and Business

  • White Papers // Jan 2013

    Lines of Malicious Code: Insights Into the Malicious Software Industry

    Malicious software installed on infected computers is a fundamental component of online crime. Malware development thus plays an essential role in the underground economy of cyber-crime. Malware authors regularly update their software to defeat defenses or to support new or improved criminal business models. A large body of research has...

    Provided By Vienna University of Economics and Business

  • White Papers // Nov 2012

    Vanity, Cracks and Malware

    Today, a large amount of software products include mechanisms to counter software piracy. However, most protection mechanisms can be easily circumvented by applying soft-ware patches (cracks) or license key generators (keygens) with seemingly no financial incentives. The authors' research shows that the distribution of cracks and keygens not only al-lows...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2012

    Automatic SLA Matching and Provider Selection in Grid and Cloud Computing Markets

    Cloud computing is a novel computing paradigm that offers data, software, and hardware services in a manner similar to traditional utilities such as water, electricity, and telephony. Usually, in Cloud and Grid computing, contracts between traders are established using Service Level Agreements (SLAs), which include objectives of service usage. However,...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2012

    Conflict Visualization for Evolving UML Models

    The urgent demand for supporting teamwork and continuous evolution of software models triggered intensive research on optimistic version control systems for models. State-of-the-art model versioning approaches primarily focus on detecting changes and conflicts between concurrently evolved versions of a model. However, techniques for conflict visualization have been hardly investigated yet....

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2012

    Optimized Execution of Business Processes on Crowdsourcing Platforms

    Crowdsourcing in enterprises is a promising approach for organizing a flexible workforce. Recent developments show that the idea gains additional momentum. However, an obstacle for widespread adoption is the lack of an integrated way to execute business processes based on a crowdsourcing platform. The main difference compared to traditional approaches...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2012

    Cloud Security and Privacy in the Light of the 2012 EU Data Protection Regulation

    The essential characteristics of cloud computing such as elasticity or broad network access provide many economic benefits for their users, but with these benefits also many security and privacy risks come along. These risks can be generally classified into legal and technical risks. The upcoming general data protection regulation by...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2012

    Virtualizing Software and Humans for Elastic Processes in Multiple Clouds - A Service Management Perspective

    There is a growing trend of combining human-based computation with machine-based computation to solve complex problems which cannot be answered with machine-based computation alone. From the computing perspective, integrating machine-based computing elements with human-based computing elements and provisioning them under the same model will facilitate the resource elasticity required by...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2012

    Self-Adaptive and Resource-Efficient SLA Enactment for Cloud Computing Infrastructures

    Cloud providers aim at guaranteeing Service Level Agreements (SLAs) in a resource-efficient way. This, amongst others, means that resources of Virtual (VMs) and Physical Machines (PMs) have to be autonomically allocated responding to external influences as workload or environmental changes. Thereby, Workload Volatility (WV) is one of the crucial factors...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2012

    Data Cache Organization for Accurate Timing Analysis

    Caches are essential to bridge the gap between the high latency main memory and the fast processor pipeline. Standard processor architectures implement two first-level caches to avoid a structural hazard in the pipeline: an instruction cache and a data cache. For tight worst-case execution times it is important to classify...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2012

    Identifying Incompatible Implementations of Industry Standard Service Interfaces for Dependable Service-Based Applications

    In this paper, the authors study fault localization techniques for identification of incompatible configurations and implementations in Service-Based Applications (SBAs). They consider SBAs with abstract service interfaces that integrate multiple concrete service implementations from various providers. Practice has shown that standardized interfaces alone do not guarantee compatibility of services originating...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2012

    Enhanced Sharing and Privacy in Collaborative Virtual Teams

    Privacy concerns keep users from sharing required information in a collaborative environment. There is a need of privacy preserving methods that can enhance flow of information among collaborating users in dynamic teams without compromising their privacy. The authors describe a user-defined role-based sharing control model and architecture that uses hybrid...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Ethics in Security Research Which Lines Should Not Be Crossed?

    Recently, several research papers in the area of information security were published that may or may not be considered unethical. Looking at these borderline cases is relevant as today's research papers will influence how young researchers conduct their research. In this paper, the authors discuss fundamental ethical principles and their...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Automation Possibilities in Information Security Management

    Information security management, as defined in ISO 27001, deals with establishing, implementing, operating, monitoring, reviewing, maintaining, and improving an information security management system. This paper provides an analysis about the automation possibilities in information security management. The analysis takes into account the potential of using security ontologies in risk management,...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Tor HTTP Usage and Information Leakage

    This paper analyzes the web browsing behavior of Tor users. By collecting HTTP requests the authors show which websites are of interest to Tor users and they determined an upper bound on how vulnerable Tor users are to sophisticated de-anonymization attacks: up to 78 % of the Tor users do...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Accurate SINR Estimation Model for System Level Simulation of LTE Networks

    This paper presents an SINR prediction model for LTE systems with the aim of improving the accuracy of physical layer models used for higher-than-physical-level simulations. This physical layer SINR abstraction for zero-forcing receivers takes channel estimation errors into account. It allows for the calculation of the post-equalization receive SINR of...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Joint Network-Channel Coding for the Asymmetric Multiple-Access Relay Channel

    In this paper, the authors consider the time-division Multiple Access Relay Channel (MARC). They propose a low-complexity compress-and-forward-based transmission scheme that consists of a scalar quantization of Log-Likelihood Ratios (LLRs), followed by a suitably defined network code. This scheme is well suited also for asymmetric source-relay channel conditions. They use...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Adaptive Channel Direction Quantization Based on Spherical Prediction

    In this paper, the authors present algorithms for the quantization of a correlated unit norm random vector process. Such algorithms are important, e.g., for channel vector quantization in wireless communication systems. Starting from a quantization codebook that uniformly quantizes the unit sphere, they propose to iteratively adapt the codebook to...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Workflow-Based Composition and Testing of Combined e-services and components

    Information systems are increasingly built using component models such as Enterprise Java Beans, COM+, or CORBA objects. Dynamically aggregated and composed Web services can be seen as a newly emerging research area for Service Oriented Architectures, which are combined with components. The authors' paper presents three main arguments: that composition...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2012

    Semantic Inter-Organizational Performance Analysis Using the Balanced Scorecard Methodology

    Evaluating Inter-Organizational Relationships (IORs) is important in today's businesses for increasing competitiveness and business potential. Typically, IORs are measured by high-level Key Performance Indicators (KPIs) such as trust, knowledge sharing, and others. However, these high-level KPIs are difficult to be measured quantitatively. It is therefore difficult to determine IORs and...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2012

    Energy Efficient Service Delivery in Clouds in Compliance with the Kyoto Protocol

    Cloud computing is revolutionizing the ICT landscape by providing scalable and efficient computing resources on demand. The ICT industry - especially data centers, are responsible for considerable amounts of CO2 emissions and will very soon be faced with legislative restrictions, such as the Kyoto protocol, defining caps at different organizational...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2012

    Quality-Aware Service-Oriented Data Integration: Requirements, State of the Art and Open Challenges

    With a multitude of data sources available online, data consumers might find it hard to select the best combination of sources for their needs. Aspects such as price, licensing, service and data quality play a major role in selecting data sources. The authors therefore advocate quality-aware data services as a...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2012

    An Interoperable and Self-adaptive Approach for SLA-based Service Virtualization in Heterogeneous Cloud Environments

    Cloud computing is a newly emerged computing infrastructure that builds on the latest achievements of diverse research areas, such as Grid computing, Service-oriented computing, business process management and virtualization. An important characteristic of Cloud-based services is the provision of non-functional guarantees in the form of Service Level Agreements (SLAs), such...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2012

    Cloud Computing for Education and Research in Developing Countries

    Recently cloud computing has offered attractive solutions for academic and research institutions due to several reasons. In this chapter, the authors present a study of how cloud computing can be used for research and teaching activities in higher educational and research institutions in developing countries. Instead of focusing on cloud...

    Provided By Vienna University of Economics and Business

  • White Papers // Mar 2012

    Users in Cells: a Data Traffic Analysis

    The authors present a large-scale cell based measurement analysis of the user behavior in a live operational HSDPA network. The motivations are: first, to understand the statistical properties of users in cells for refining network planning procedures; and second, to provide realistic traffic models for simulations of cellular packet-oriented networks....

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2012

    Data Concern Aware Querying for the Integration of Data Services

    There is an increasing trend for organizations to publish data over the web using data services. The published data is often associated with data concerns like privacy, licensing, pricing, quality of data, etc. This raises several new challenges. For instance, it must be ensured that data consumers utilize the data...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2012

    Trusted Information Sharing Using SOA-Based Social Overlay Networks

    Cross-enterprise collaboration has emerged as a key survival factor in today's global markets. Semantic Web technologies are the basis to establish enterprise interoperability including data mediation support and automatic composition of services. Capabilities of services are semantically described and reasoning techniques support the discovery and selection of services at run-time....

    Provided By Vienna University of Economics and Business

  • White Papers // May 2010

    Inter-Organizational Reference Modeling - A Position Statement

    In this paper, the authors have developed a model-driven approach towards inter-organizational systems. During its evaluation phase they recognized that different partner networks operate similar, but still slightly differ in some details. However, their current approach is limited with respect to reuse of models or parts thereof for different partner...

    Provided By Vienna University of Economics and Business

  • White Papers // Nov 2007

    Service-Oriented Transformation of Business Models Into Deployment Artifacts

    In recent years Business-To-Business (B2B) e-commerce has been subject to major rethinking. A paradigm shift from document centric file-based interchange of business information to process-centric and finally, a service-based information exchange can be observed. On a business level, a lot of work has been done to capture business models and...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2009

    On the Contribution of Reference Modeling to e-Business Standardization - How to Apply Design Techniques of Reference Modeling to UN/CEFACT's Modeling Methodology

    Reference Modeling has evolved as a strong discipline especially driven by the German speaking community. Great achievements have been made in finding ways to leverage the potentials of reuse in business modeling. However, the perception of reference modeling as such is still limited to a rather small group of scholars....

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2010

    A Registry Model for UN/CEFACT's Core Components

    Business documents exchanged in a service-oriented context play a crucial role in the definition of service interfaces. Only if both partners have a common agreement on the data exchanged, automated business interactions are possible. The United Nations CEnter for Trade FACiliTation and Electronic Business (UN/CEFACT) provides a reliable and interoperable...

    Provided By Vienna University of Economics and Business

  • White Papers // Nov 2009

    A Framework for Managing the Complexity of Business Document Integration

    The electronic exchange of business documents is an often communicated desire by enterprises and the public sector. Electronic business is currently mainly hindered by unresolved interoperability issues and a lack of tool support. Additionally, computer aided document exchange is cost intensive at the beginning and thus discourages small and medium-sized...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2010

    Size Matters!? Measuring the Complexity of XML Schema Mapping Models

    Therefore, a notion of complexity is desirable for both, manual as well as automatic mapping processes. For this reason the authors develop an initial set of metrics, based on well established metrics for XML Schema, allowing analyzing the complexity of business document standards. Exchanging structured business documents is inevitable for...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2009

    Towards a Global Business Document Reference Ontology

    In the field of business document standardization a multitude of different standardization efforts exist. Unfortunately, most of the developed standards are designed for a specific application domain or industry and do not consider cross-standard interoperability. This results in several incompatible standard definitions. Without the provision of a common semantical basis...

    Provided By Vienna University of Economics and Business

  • White Papers // Dec 2007

    Inter-Organizational Systems: From Business Values Over Business Processes to Deployment

    Inter-organizational systems have significantly been affected by Service-oriented Architectures (SOA) and Web Services the state-of-the-art technology to implement SOA. SOA is said to enable quick and inexpensive changes of the IT in order to establish new business partnerships or to reflect changes in existing partnerships. However, current approaches to inter-organizational...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2009

    From e3-Value to REA: Modeling Multi-Party eBusiness Collaborations

    In order to open-up enterprise applications to e-business and make them profitable for a communication with other enterprise applications, a business model is needed showing the business essentials of the e-commerce business case to be developed. Currently there are two major business modeling techniques - e3-value and REA (Resource-Event-Agent). Whereas...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2009

    A Domain Specific Language for UN/CEFACT's Core Components

    In order to overcome the heterogeneities of different business document standards the United Nations Center for Trade Facilitation and Electronic Business (UN/CEFACT) has released the Core Components Technical Specification (CCTS). Core components are reusable building blocks for assembling business documents in an implementation neutral manner. However, core components are standardized...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2008

    A 3-level e-Business Registry Meta Model

    Business partners willing to does business electronically with each other must reach an agreement; on the economic level, on the inter-organizational process choreography, and on the services implementing the choreography. In order to search for a potential business partner, one will first look for a partner who offers a required...

    Provided By Vienna University of Economics and Business

  • White Papers // Jul 2009

    The Business Choreography Language (BCL) - A Domain-Specific Language for Global Choreographies

    UN/CEFACT's Modeling Methodology (UMM) is a modeling approach for describing the choreography of B2B processes. UMM is developed by the United Nations Center for Trade Facilitation and Electronic Business (UN/CEFACT) and currently defined as a UML profile. Thereby, it constrains the UML for the specific needs of B2B. As the...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2010

    Reference Modeling for Inter-Organizational Systems

    Inter-organizational business process models are created and used by different partner networks. Often, those models are similar but differ in certain business needs. Due to the lack of methods and tools, companies are required to start from scratch to create their specific models instead of taking advantage of and reusing...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2008

    An Add-In for UN/CEFACT's Modeling Methodology 2.0

    UN/CEFACT's Modeling Methodology (UMM) is a UML based modeling language and has become the method of choice for the modeling of inter-organizational business processes. The complexity of UMM, however, makes it difficult to use for novice modelers. In order to overcome this limitation and to allow for a seamless integration...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2007

    A UML Profile for Core Components and Their Transformation to XSD

    In business-to-business e-commerce, traditional Electronic Data Interchange (EDI) approaches such as UN/EDIFACT have been superseded by approaches like web services and ebXML. Nevertheless, a precise and common semantic definition of business documents exchanged is needed. In order to become independent from transfer syntax, the authors prefer defining the documents as...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2008

    Deriving Business Service Interfaces in Windows Workflow from UMM Transactions

    Modeling inter-organizational business processes identifies the services each business partner has to provide and to consume as well as the flow of interactions between them. A model-driven approach to inter-organizational business processes allows abstracting from the underlying IT platform and, thereby, guarantees to survive changes in technology. UN/CEFACT's Modeling Methodology...

    Provided By Vienna University of Economics and Business

  • White Papers // Dec 2006

    A State Machine Executing UMM Business Transactions

    UN/CEFACT's Modeling Methodology (UMM) is a UML profile for modeling global B2B choreographies. The current UMM version comprises three main views for describing a computation independent model from a neutral perspective. Currently, the UMM version is missing a platform independent model showing how each partner has to realize the message...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2012

    Automatic SLA Matching and Provider Selection in Grid and Cloud Computing Markets

    Cloud computing is a novel computing paradigm that offers data, software, and hardware services in a manner similar to traditional utilities such as water, electricity, and telephony. Usually, in Cloud and Grid computing, contracts between traders are established using Service Level Agreements (SLAs), which include objectives of service usage. However,...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2012

    Virtualizing Software and Humans for Elastic Processes in Multiple Clouds - A Service Management Perspective

    There is a growing trend of combining human-based computation with machine-based computation to solve complex problems which cannot be answered with machine-based computation alone. From the computing perspective, integrating machine-based computing elements with human-based computing elements and provisioning them under the same model will facilitate the resource elasticity required by...

    Provided By Vienna University of Economics and Business

  • White Papers // Apr 2012

    Quality-Aware Service-Oriented Data Integration: Requirements, State of the Art and Open Challenges

    With a multitude of data sources available online, data consumers might find it hard to select the best combination of sources for their needs. Aspects such as price, licensing, service and data quality play a major role in selecting data sources. The authors therefore advocate quality-aware data services as a...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2012

    Trusted Information Sharing Using SOA-Based Social Overlay Networks

    Cross-enterprise collaboration has emerged as a key survival factor in today's global markets. Semantic Web technologies are the basis to establish enterprise interoperability including data mediation support and automatic composition of services. Capabilities of services are semantically described and reasoning techniques support the discovery and selection of services at run-time....

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2013

    M2M Platform-as-a-Service for Sustainability Governance

    Recently, cloud computing technologies have been employed for large-scale Machine-To-Machine (M2M) systems, as they could potentially offer better solutions for managing monitoring data and analytics applications to support the needs of different consumers. However, there exist complex relationships between monitored objects, monitoring data, analysis features, and stakeholders in M2M that...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2013

    Application-Level Performance Monitoring of Cloud Services Based on the Complex Event Processing Paradigm

    Monitoring of applications deployed to Infrastructure-as-a-Service clouds is still an open problem. In this paper, the authors discuss an approach based on the complex event processing paradigm, which allows application developers to specify and monitor high-level application performance metrics. They use the case of a Web 2.0 sentiment analysis application...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2012

    Data Concern Aware Querying for the Integration of Data Services

    There is an increasing trend for organizations to publish data over the web using data services. The published data is often associated with data concerns like privacy, licensing, pricing, quality of data, etc. This raises several new challenges. For instance, it must be ensured that data consumers utilize the data...

    Provided By Vienna University of Economics and Business

  • White Papers // Oct 2010

    A Programmble Fault Injection Testbed Generator for SOA

    In this paper, the authors present the prototype of their fault injection testbed generator. Their tool empowers engineers to generate emulated SOA environments and to program fault injection behavior on diverse levels: at the network layer, at the execution level, and at the message layer. Engineers can specify the structure...

    Provided By Vienna University of Economics and Business

  • White Papers // Jan 2010

    Trust-based Adaptation in Complex Service-oriented Systems

    Complex networks consisting of humans and software services, such as Web-based social and collaborative environments, typically require flexible and context-based interaction models. Due to the dynamics in such systems, networks are in a state of constant flux and change. Several fundamental concepts, including discovery, interactions, task delegations and executions are...

    Provided By Vienna University of Economics and Business

  • White Papers // Jul 2009

    Self-Adaptation Techniques for Complex Service-oriented Systems

    Complex service-oriented systems comprise humans and software services spanning multiple organizations. These systems are highly dynamic, because services, processes, and teams are not only diverse but they also constantly evolve. Therefore, these systems introduce a variety of challenges on how to adapt services, processes, and teams to changing situations. The...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2009

    The Cycle of Trust in Mixed Service-oriented Systems

    Many collaboration platforms are realized as service-oriented systems enabling flexible compositions of services and support of interactions. Interactions between entities in such systems do not only span software services, but also human actors. A mixed service-oriented system is therefore composed of human and software services. In open environments, interactions between...

    Provided By Vienna University of Economics and Business

  • White Papers // May 2009

    Trust and Reputation Mining in Professional Virtual Communities

    Communication technologies, such as e-mail, instant messaging, discussion forums, blogs, and newsgroups connect people together, forming virtual communities. This concept is not only used for private purposes, but is also attracting attention in professional environments, allowing consulting a large group of experts. Due to the overwhelming size of such communities,...

    Provided By Vienna University of Economics and Business

  • White Papers // Feb 2009

    VieTE - Enabling Trust Emergence in Service-oriented Collaborative Environments

    In activity-centric environments where people from different companies and disciplines work remotely together and where new virtual teams are formed and dissolved continuously, how to find the most suitable collaboration partner for a given task and how well one partner is able to collaborate with another one are challenging research...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2012

    Conflict Visualization for Evolving UML Models

    The urgent demand for supporting teamwork and continuous evolution of software models triggered intensive research on optimistic version control systems for models. State-of-the-art model versioning approaches primarily focus on detecting changes and conflicts between concurrently evolved versions of a model. However, techniques for conflict visualization have been hardly investigated yet....

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2008

    Architecture of a Modular IEEE 802.15.4a Ultra-Wideband Transmitter

    As part of a multi-channel, multi-band evaluation platform for future wireless sensor network applications, an IEEE 802.15.4a standard conform transmitter is investigated. The paper gives an overview of the authors' transmitter concept and ultra-wide band signals according to IEEE 802.15.4a. It analyzes the system design aspects of the transmitter for...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2009

    Testbedding MIMO HSDPA and WiMAX

    Modern wireless communication systems employ MIMO and feedback - two properties that make it especially difficult to measure the performance of such systems with reasonable effort in actual outdoor scenarios. In this paper, the authors will present a time, cost, and manpower efficient measurement approach to evaluate the throughput achieved...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2009

    MIMO HSDPA Throughput Measurement Results in an Urban Scenario

    In this paper, the authors report on results of MIMO High Speed Downlink Packet Access (HSDPA) throughput measurements. These measurements were carried out in an urban scenario. Besides the standard compliant SISO and two transmit antenna schemes, they defined and measured also a four antenna scheme. In all throughput measurements...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2008

    Measurement Based Evaluation of Low Complexity Receivers for D-TXAA HSDPA

    In 2007, the 3GPP agreed to standardize D-TxAA (Dual Stream Transmit Antenna Array) as the MIMO extension for HSDPA (High Speed Downlink Packet Access). In this paper, the authors examine receiver structures for D-TxAA. At a high SINR, D-TxAA operates in the dual stream mode, i.e. two independent data streams...

    Provided By Vienna University of Economics and Business

  • White Papers // Aug 2009

    Simulating the Long Term Evolution Physical Layer

    Research and development of signal processing algorithms for UMTS Long Term Evolution (LTE) requires a realistic, flexible, and standard-compliant simulation environment. To facilitate comparisons with work of other research groups such a simulation environment should ideally be publicly available. In this paper, the authors present a MATLAB-based down-link physical-layer simulator...

    Provided By Vienna University of Economics and Business

  • White Papers // Jun 2011

    Interference Alignment in the Partially Connected K-User MIMO Interference Channel

    The authors consider interference alignment in the partially connected K-user MIMO Interference Channel (IC). Conversely to the fully-connected case, they show that interference alignment can be achievable for an arbitrary number of users K in the network, while the per-user signaling dimension remains fixed, provided that the number of interference...

    Provided By Vienna University of Economics and Business

  • White Papers // Nov 2008

    MIMO-BICM with Imperfect Channel State Information: Exit Chart Analysis and Ldpc Code Optimization

    The authors investigate MIMO systems employing bit-interleaved coded modulation and iterative decoding with imperfect channel estimates. An optimum soft demodulator for this scenario with i.i.d. Rayleigh fading was recently proposed by Sadough et al. They extend the optimum demodulator to correlated channel models and provide a code-independent performance comparison of...

    Provided By Vienna University of Economics and Business

  • White Papers // Sep 2010

    Carrier Frequency Synchronization in the Downlink of 3GPP LTE

    In this paper, the authors investigate carrier frequency synchronization in the downlink of 3GPP Long Term Evolution (LTE). A complete carrier frequency offset estimation and compensation scheme based on standardized synchronization signals and reference symbols is presented. The estimation performance in terms of mean square error is derived analytically and...

    Provided By Vienna University of Economics and Business

  • White Papers // Jul 2009

    Validation of Minimum-Energy Band-Limited Prediction Using Vehicular Channel Measurements

    The authors demonstrate that Minimum-Energy (ME) band-limited prediction shows the same robust performance for vehicular channel measurements as well as for the numeric Clarke channel model. By contrast, channel prediction based on sinusoidal modelling presented by Chen et al., 2007, shows poor performance for a small percentage of measured channel...

    Provided By Vienna University of Economics and Business