University of Oulu

Displaying 1-40 of 53 results

  • White Papers // Jun 2013

    BPLOM: BPM Level-Oriented Methodology for Incremental Business Process Modeling and Code Generation on Mobile Platforms

    The requirements engineering phase is the departure point for the development process of any kind of computer application, it determines the functionality needed in the working scenario of the program. Although this is a crucial point in application development, as incorrect requirement definition leads to costly error appearance in later...

    Provided By University of Oulu

  • White Papers // Oct 2012

    Developing a Business Application with BPM and MDE

    In this paper, the authors have designed an architecture for the generation of a business application that allows to business users to adapt their processes to the constant change. At the moment all the architectures based to a great extent on SOA allow to modify the processes in a short...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Secure and Multihomed Vehicular Femtocells

    Operators must ensure seamless voice and data session continuity even when subscribers are on move. Service continuity is one of the most critical quality parameter in a cellular system. QoS during handover is always hindered by the handover latency and packet loss. Among several approaches, IP multi-homing is a promising...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Inter Technology Load Balancing Algorithm for Evolved Packet System

    In this paper, the authors present an advanced load balancing algorithm for Evolved Packet System utilizing different radio interfaces. By using the fact that Evolved Packet Core can support, in addition to LTE also multiple other packet data technologies, such as WLAN, they can utilize this additional dimension for benefit...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Secured VPN Models for LTE Backhaul Networks

    The Long Term Evolution (LTE) architecture proposes a flat all-IP backhaul network. 3rd Generation Partnership Project (3GPP) specified new security and traffic transport requirements of new LTE backhaul network. However, existing LTE backhaul traffic architectures are incapable of achieving these security requirements. In this paper, the authors propose two secured...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Survey on Congestion Control Mechanisms for Wireless Sensor Networks

    Congestion is very common in 6LoWPAN networks, but classical congestion control techniques do not suit well to the resource constrained environments. The main goal of this paper is to make an overview of the existing congestion control techniques for constrained environment and propose a need for the development of new...

    Provided By University of Oulu

  • White Papers // Apr 2012

    Test Adequacy Evaluation for the User-Database Interaction: A Specification-Based Approach

    Testing a database application is a challenging process where both the database and the user interaction have to be considered in the design of test cases. This paper describes a specification-based approach to guide the design of test inputs (both the test database and the user inputs) for a database...

    Provided By University of Oulu

  • White Papers // Mar 2012

    Introduction to Devices Orchestration in Internet of Things Using SBPMN

    In this paper, the authors try to provide an architecture that allows the orchestration of objects that are part of the Internet of things creating business processes. Internet of Things is still in full development; this implies that there is a lack of standards for its proper implementation. Among these...

    Provided By University of Oulu

  • White Papers // Jul 2011

    PanOULU: Triple Helix Driven Municipal Wireless Network Providing Open and Free Internet Access

    This paper describes the birth, evolution and current status of a unique wireless city network provided by a consortium of municipalities, public research and educational institutions, and industry. The relevance of the network is illustrated with statistics of providing open and free Internet access to the general public and with...

    Provided By University of Oulu

  • White Papers // Jun 2011

    Securing the Backhaul for Mobile and Multi-Homed Femtocells

    The evolution of femtocells in residential networks expects to accelerate dramatically in next few years. The Femto Access Points (FAPs) connect subscribers to the operator through the residential broadband access or the public Internet. The connectivity between the FAP and the core network has a high risk of being compromised....

    Provided By University of Oulu

  • White Papers // Apr 2011

    Distributed Web Service Architecture for Scalable Content Analysis: Semi-Automatic Annotation of User Generated Content

    This paper describes distributed web service architecture to allow web level scalability for multimedia content analysis. The authors introduce service component architecture that allows for orchestration and composition of services as content analysis units to enrich multimedia metadata using common data model built upon MPEG-7 content description standard. They report...

    Provided By University of Oulu

  • White Papers // Apr 2011

    Key Agreement Based on Homomorphisms of Algebraic Structures

    The authors give a generalization of the Diffie-Hellman key agreement scheme that is based on the hardness of computing homomorphic images from an algebra to another. They formulate computational and decision versions of the homomorphic image problem and devise a key agreement protocol that is secure in the Canetti-Krawczyk model...

    Provided By University of Oulu

  • White Papers // Apr 2011

    Robustness of a P2P Community Management System Based on Two-Level Hierarchical DHT Overlays

    The popularity of community-centric applications has rapidly grown during the recent years. In this paper, the authors evaluate the robustness of a P2P community management system, where communities are established as autonomous DHT overlays that are advertised in a global DHT overlay. The evaluation is based on the experimental measurements...

    Provided By University of Oulu

  • White Papers // Mar 2011

    Camera-Based Motion Recognition for Mobile Interaction

    Multiple built-in cameras and the small size of mobile phones are underexploited assets for creating novel applications that are ideal for pocket size devices, but may not make much sense with laptops. In this paper the authors present two vision-based methods for the control of mobile user interfaces based on...

    Provided By University of Oulu

  • White Papers // Feb 2011

    Comparison and Analysis of Secure Mobile Architecture (SMA) and Evolved Packet System

    In this paper, the authors analyze and compare two architectures providing an all-IP based connectivity and mobility for mobile devices over heterogeneous access technologies: Evolved Packet System (EPS) as specified by 3GPP and Secure Mobile Architecture (SMA), a standardization effort by The Open Group (TOG). They briefly present each architecture...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Supply Chain Performance Measurement In The Manufacturing Industry

    Supply chain performance measurement - the process of qualifying the efficiency and effectiveness of the supply chain. The aim of this study is to create a supply chain measurement framework for manufacturing industry, define what data should be measured and verify the measurement framework in the case company's supply chain....

    Provided By University of Oulu

  • White Papers // Jan 2011

    Measuring and Modelling Sewer Pipes From Video

    This paper presents a system for the automatic measurement and modelling of sewer pipes. The system recovers the interior shape of a sewer pipe from a video sequence which is acquired by a fish-eye lens camera moving inside the pipe. The approach is based on tracking interest points across successive...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Cross-Layer Energy Analysis of Multi-Hop Wireless Sensor Networks

    In this paper, the authors propose a detailed energy survey of the physical, data link, and network layer by analytical techniques. They also show the impact of regular sleep periods on node energy consumption and present a comparison analysis of single-hop vs. multi-hop communications in the energy realm. A detailed...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Institutional Viewpoint on Wireless Standardisation Process

    The complexity of organizational and technological changes confronting most organizations has made an organizational change and adaptation a topical research question. This paper examines the process of wireless standardization viewpoint and sets out a framework for understanding organizational changes in wireless standardization organizations by applying institutional theory. It is concluded...

    Provided By University of Oulu

  • White Papers // Dec 2010

    Mobile Customer Relationship Management

    This paper examines communication through the mobile medium in customer relationship management (hereafter mCRM). Although the academic research on mCRM is gradually evolving, there is still a lack of empirical research on this topical issue. Therefore, the purpose of this paper is to begin to fill this gap by enhancing...

    Provided By University of Oulu

  • White Papers // Sep 2010

    P2P SCCM: Service-Oriented Community Coordinated Multimedia Over P2P and Experience on Multimedia Annotation Service Development

    Peer-to-Peer Service-oriented Community Coordinated Multimedia (SCCM) is envisioned as a novel paradigm in which the user consumes multiple media through requesting multimedia-intensive Web services via diversity display devices, converged networks, and heterogeneous platforms within a virtual, open and collaborative community in this chapter. A generic P2P SCCM scenario is created...

    Provided By University of Oulu

  • White Papers // Aug 2010

    Levels Of Processes, Intertwining Actions And Network Change

    Studies on network dynamics are analyzed from the viewpoint of alternative conceptual and methodological approaches provided for research on network change. The paper emphasizes particularly two definitional and methodological challenges; business network is never a single unit or a one-dimensional phenomenon and networks change as a result of human action...

    Provided By University of Oulu

  • White Papers // Jul 2010

    Analysis of Messaging Load in a P2PP Overlay Network Under Churn

    The authors analyze the performance of a DHT-based P2P overlay network in resource access and overlay maintenance activities. They use a cross-platform implementation of the protocol called P2PP. Mobile systems are the main target platform of the protocol implementation; due to practical reasons, they conduct large-scale evaluations using a server...

    Provided By University of Oulu

  • White Papers // Jul 2010

    The Value Relevance Of Firms~ Integral Environmental Impact: Evidence From Russia

    The purpose of this paper is to investigate the value relevance of firms' integral environmental impact. In this paper, the authors utilize data from 74 Russian listed firms for the years 2005-2007. For the proxy of environmental performance they use the integral environmental impact measure, which they construct on the...

    Provided By University of Oulu

  • White Papers // Jul 2010

    Guidelines for the Implementation of Cross-Platform Mobile Middleware

    The authors describe and analyze the experiences from a cross-platform mobile middleware project. The aim is to identify best practices and provide guidelines for solving similar problems in the context of cross-platform-targeted programming in mobile as well as other environments. The main deliverable of the observed project was a cross-platform...

    Provided By University of Oulu

  • White Papers // Jun 2010

    Internal Organizing In Project Business Organization In Relation To Customer Relationships

    This paper focuses on multinational project business organization and how the customer relationship is organized in such context. Organizing is used as a concept to describe the internal actions needed for creating a unified understanding of the customer. The present paper employs process research strategy in a single case study...

    Provided By University of Oulu

  • White Papers // Jun 2010

    Networked Business Model Development In An Emerging Business Field

    Emerging technologies present many opportunities for new business creation but also pose many challenges. A variety of actors and roles need to be identified and organized into business nets to develop and commercialize new technological solutions. In parallel, new business models need to be developed in the nets to create...

    Provided By University of Oulu

  • White Papers // Apr 2010

    Web-Based Framework for Spatiotemporal Screen Real Estate Management of Interactive Public Displays

    In this paper the authors present a web-based framework for spatiotemporal screen real estate management of interactive public displays. The framework facilitates dynamic partitioning of the screen real estate into virtual screens assigned for multiple concurrent web applications. The framework is utilized in the implementation of so-called UBI-hotspot, which provides...

    Provided By University of Oulu

  • White Papers // Apr 2010

    Efficiency of the ALOHA Protocol in Multi-Hop Networks

    This paper presents the evaluation of the multi-hop aggregate information efficiency of the slotted and unslotted ALOHA protocols. The authors consider a multi-hop wireless network where the nodes are spatially characterized by a Poisson point process and the traffic generation also follows a Poisson distribution. By applying the properties of...

    Provided By University of Oulu

  • White Papers // Nov 2009

    A Robust Algorithm for the Membership Management of Super-Peer Overlay

    Peer-to-Peer technologies have been widely applied for multimedia applications. The super-peer based approach provides an efficient way to run applications by exploring nodes' heterogeneity. In P2P live video streaming, even though the number of stable nodes is small, they have significant impact on the performance of the network. Thus, the...

    Provided By University of Oulu

  • White Papers // Nov 2009

    MEDUSA: Middleware for End-User Composition of Ubiquitous Applications

    Activity-Oriented Computing (AOC) is a paradigm promoting the run-time realization of applications by composing ubiquitous services in the user's surroundings according to abstract specifications of user activities. The paradigm is particularly well-suited for enacting ubiquitous applications. However, there is still a need for end-users to create and control the ubiquitous...

    Provided By University of Oulu

  • White Papers // Nov 2009

    A Note on Conjugacy Search and Racks

    The authors show that for every effective left conjugacy closed left quasigroup, there is an induced rack that retains the conjugation structure of the left translations. This means that cryptographic protocols relying on conjugacy search can be secure only if conjugacy search of left translations is infeasible in the induced...

    Provided By University of Oulu

  • White Papers // Nov 2009

    Full Predicate Coverage for Testing SQL Database Queries

    In the field of database applications a considerable part of the business logic is implemented using a semi-declarative language: the Structured Query Language (SQL). Because of the different semantics of SQL compared to other procedural languages, the conventional coverage criteria for testing are not directly applicable. This paper presents a...

    Provided By University of Oulu

  • White Papers // Sep 2009

    Personal Interaction And Customer Relationship Management In Project Business

    Management of project business has been seen to involve two primary levels i.e. management of projects or project portfolios and management of customer relationships (Alajoutsij?rvi, 1996; Skaates, Tikkanen & Lindblom, 2002; Tikkanen, Kujala & Artto, 2006). Management at both levels is complex especially because of the uniqueness of projects and...

    Provided By University of Oulu

  • White Papers // Sep 2009

    On-Line Process Management of Pavement Laying Using Wireless Communication Technologies

    The research goal has been synchronizing the process of asphalt production, asphalt transportation and pavement laying by connecting different machines together using wireless technologies. Sensors and GPS positioning units were installed to the machines for measuring process variables (e.g. mass temperature) and detecting events (e.g. loading, unloading). The first prototype...

    Provided By University of Oulu

  • White Papers // Aug 2009

    A Review of the Scheduling Problem in Wireless Networks

    The authors describe the fundamental issue of scheduling the allocation of wireless network resources and provide several formulations of the associated problems. The emphasis is on scheduling transmission attempts. They place this problem in the context of existing approaches, like information theoretic and traditional network theoretic ones, as well as...

    Provided By University of Oulu

  • White Papers // Aug 2009

    Battery Life of Mobile Peers With UMTS and WLAN in a Kademlia-Based P2P Overlay

    The authors evaluate the battery life of mobile devices that act as full-fledged peer nodes in a Kademlia DHT based P2P overlay network. The motivation is to find out how long a mobile peer is able to function in a UMTS or WLAN access network, and how the different parameter...

    Provided By University of Oulu

  • White Papers // Jul 2009

    Effects of Different Churn Models on the Performance of Structured Peer-to-Peer Networks

    The authors present the effects of different churn models on the performance of structured Peer-To-Peer (P2P) networks in this paper. Specifically, Exponential Distribution (ED), Pareto Distribution (PD), and Weibull Distribution (WD) are evaluated to provide a comparative analysis. Kademlia-based Peer-to-Peer Protocol (P2PP) is utilized as the underlying signaling protocol. Through...

    Provided By University of Oulu

  • White Papers // Jul 2009

    Using Unstructured Service Supplementary Data Signaling for Mobile Peer-to-Peer Invocations

    This paper proposes a method for initiating IP-based Peer-To-Peer (P2P) communication sessions in cases where the target of the initial communication attempt is a mobile device. Mobile P2P networking poses certain problems: a battery-powered device may not always keep its network interfaces on for IP communications due to battery life...

    Provided By University of Oulu

  • White Papers // Jul 2009

    Suitability of DHT-Based Peer-to-Peer Session Initiation Protocol for Wireless Distributed Services

    Providing both analytical and empirical results, it analyzes the suitability of Distributed Hash Tables (DHT)-based Peer-to-Peer Session Initiation Protocol (P2PSIP) overlay networking as a substrate for wireless, distributed multimedia services. Session initiation is just one application of this framework. First, it discusses the potential of P2PSIP for different applications and...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Survey on Congestion Control Mechanisms for Wireless Sensor Networks

    Congestion is very common in 6LoWPAN networks, but classical congestion control techniques do not suit well to the resource constrained environments. The main goal of this paper is to make an overview of the existing congestion control techniques for constrained environment and propose a need for the development of new...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Secured VPN Models for LTE Backhaul Networks

    The Long Term Evolution (LTE) architecture proposes a flat all-IP backhaul network. 3rd Generation Partnership Project (3GPP) specified new security and traffic transport requirements of new LTE backhaul network. However, existing LTE backhaul traffic architectures are incapable of achieving these security requirements. In this paper, the authors propose two secured...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Inter Technology Load Balancing Algorithm for Evolved Packet System

    In this paper, the authors present an advanced load balancing algorithm for Evolved Packet System utilizing different radio interfaces. By using the fact that Evolved Packet Core can support, in addition to LTE also multiple other packet data technologies, such as WLAN, they can utilize this additional dimension for benefit...

    Provided By University of Oulu

  • White Papers // Jun 2012

    Secure and Multihomed Vehicular Femtocells

    Operators must ensure seamless voice and data session continuity even when subscribers are on move. Service continuity is one of the most critical quality parameter in a cellular system. QoS during handover is always hindered by the handover latency and packet loss. Among several approaches, IP multi-homing is a promising...

    Provided By University of Oulu

  • White Papers // Jun 2011

    Securing the Backhaul for Mobile and Multi-Homed Femtocells

    The evolution of femtocells in residential networks expects to accelerate dramatically in next few years. The Femto Access Points (FAPs) connect subscribers to the operator through the residential broadband access or the public Internet. The connectivity between the FAP and the core network has a high risk of being compromised....

    Provided By University of Oulu

  • White Papers // Feb 2011

    Comparison and Analysis of Secure Mobile Architecture (SMA) and Evolved Packet System

    In this paper, the authors analyze and compare two architectures providing an all-IP based connectivity and mobility for mobile devices over heterogeneous access technologies: Evolved Packet System (EPS) as specified by 3GPP and Secure Mobile Architecture (SMA), a standardization effort by The Open Group (TOG). They briefly present each architecture...

    Provided By University of Oulu

  • White Papers // Sep 2006

    SQLMutation: A Tool to Generate Mutants of SQL Database Queries

    The Structured Query Language (SQL) is a semi-declarative language used by the applications to access the information stored in relational database systems. The authors present a tool to automatically generate mutants of SQL database queries. The SQLMutation tool is available on the web and it can be accessed using two...

    Provided By University of Oulu

  • White Papers // Jan 2002

    Rich Interaction in the Context of Networked Virtual Environments - Experiences Gained from the Multi-player Games Domain

    The aim of this paper is to provide a tentative taxonomy and corresponding hierarchical model of interaction in the context of Networked Virtual Environments. The purpose of this paper is to suggest a new research approach that would contribute in bridging this gap by applying the experience gained from games...

    Provided By University of Oulu

  • White Papers // Mar 2009

    Feasibility Evaluation of Context Distribution in Mobile Environment

    Although mobile devices are rich sources of context information, the distribution of context in mobile environments is often hindered by the limited battery life, and wireless connections with low bandwidth. This paper presents two different implementations that enable context distribution in mobile environments. The first solution relies on a presence...

    Provided By University of Oulu

  • White Papers // Jul 2009

    Suitability of DHT-Based Peer-to-Peer Session Initiation Protocol for Wireless Distributed Services

    Providing both analytical and empirical results, it analyzes the suitability of Distributed Hash Tables (DHT)-based Peer-to-Peer Session Initiation Protocol (P2PSIP) overlay networking as a substrate for wireless, distributed multimedia services. Session initiation is just one application of this framework. First, it discusses the potential of P2PSIP for different applications and...

    Provided By University of Oulu

  • White Papers // Sep 2009

    On-Line Process Management of Pavement Laying Using Wireless Communication Technologies

    The research goal has been synchronizing the process of asphalt production, asphalt transportation and pavement laying by connecting different machines together using wireless technologies. Sensors and GPS positioning units were installed to the machines for measuring process variables (e.g. mass temperature) and detecting events (e.g. loading, unloading). The first prototype...

    Provided By University of Oulu

  • White Papers // Dec 2010

    Mobile Customer Relationship Management

    This paper examines communication through the mobile medium in customer relationship management (hereafter mCRM). Although the academic research on mCRM is gradually evolving, there is still a lack of empirical research on this topical issue. Therefore, the purpose of this paper is to begin to fill this gap by enhancing...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Supply Chain Performance Measurement In The Manufacturing Industry

    Supply chain performance measurement - the process of qualifying the efficiency and effectiveness of the supply chain. The aim of this study is to create a supply chain measurement framework for manufacturing industry, define what data should be measured and verify the measurement framework in the case company's supply chain....

    Provided By University of Oulu

  • White Papers // Apr 2010

    Web-Based Framework for Spatiotemporal Screen Real Estate Management of Interactive Public Displays

    In this paper the authors present a web-based framework for spatiotemporal screen real estate management of interactive public displays. The framework facilitates dynamic partitioning of the screen real estate into virtual screens assigned for multiple concurrent web applications. The framework is utilized in the implementation of so-called UBI-hotspot, which provides...

    Provided By University of Oulu

  • White Papers // Nov 2009

    A Note on Conjugacy Search and Racks

    The authors show that for every effective left conjugacy closed left quasigroup, there is an induced rack that retains the conjugation structure of the left translations. This means that cryptographic protocols relying on conjugacy search can be secure only if conjugacy search of left translations is infeasible in the induced...

    Provided By University of Oulu

  • White Papers // Aug 2008

    Customer Involvement And Organizational Design: Different Configurations Of Project Business Firms

    Although there is, until now, a considerable amount of academic literature cumulated on project business firms, the diversity of the firms is not well recognized. Knowing industrial business relationships to be typically based on wide variety of interactions between buying and selling firms, the authors emphasize the influence of customers...

    Provided By University of Oulu

  • White Papers // Aug 2008

    Evolving Global Business: Network Embedded Behaviours Of Business Development

    This paper examines emergence of international new ventures and their attempts for rapid evolvement of global business activities through examination of three intertwined, network based processes. Specifically the authors aim to find out how the business of technology-driven international new ventures evolves over the very first years of operation. They...

    Provided By University of Oulu

  • White Papers // Jun 2010

    Networked Business Model Development In An Emerging Business Field

    Emerging technologies present many opportunities for new business creation but also pose many challenges. A variety of actors and roles need to be identified and organized into business nets to develop and commercialize new technological solutions. In parallel, new business models need to be developed in the nets to create...

    Provided By University of Oulu

  • White Papers // Jun 2010

    Internal Organizing In Project Business Organization In Relation To Customer Relationships

    This paper focuses on multinational project business organization and how the customer relationship is organized in such context. Organizing is used as a concept to describe the internal actions needed for creating a unified understanding of the customer. The present paper employs process research strategy in a single case study...

    Provided By University of Oulu

  • White Papers // Aug 2010

    Levels Of Processes, Intertwining Actions And Network Change

    Studies on network dynamics are analyzed from the viewpoint of alternative conceptual and methodological approaches provided for research on network change. The paper emphasizes particularly two definitional and methodological challenges; business network is never a single unit or a one-dimensional phenomenon and networks change as a result of human action...

    Provided By University of Oulu

  • White Papers // Sep 2009

    Personal Interaction And Customer Relationship Management In Project Business

    Management of project business has been seen to involve two primary levels i.e. management of projects or project portfolios and management of customer relationships (Alajoutsij?rvi, 1996; Skaates, Tikkanen & Lindblom, 2002; Tikkanen, Kujala & Artto, 2006). Management at both levels is complex especially because of the uniqueness of projects and...

    Provided By University of Oulu

  • White Papers // Jul 2010

    The Value Relevance Of Firms~ Integral Environmental Impact: Evidence From Russia

    The purpose of this paper is to investigate the value relevance of firms' integral environmental impact. In this paper, the authors utilize data from 74 Russian listed firms for the years 2005-2007. For the proxy of environmental performance they use the integral environmental impact measure, which they construct on the...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Measuring and Modelling Sewer Pipes From Video

    This paper presents a system for the automatic measurement and modelling of sewer pipes. The system recovers the interior shape of a sewer pipe from a video sequence which is acquired by a fish-eye lens camera moving inside the pipe. The approach is based on tracking interest points across successive...

    Provided By University of Oulu

  • White Papers // Jul 2010

    Guidelines for the Implementation of Cross-Platform Mobile Middleware

    The authors describe and analyze the experiences from a cross-platform mobile middleware project. The aim is to identify best practices and provide guidelines for solving similar problems in the context of cross-platform-targeted programming in mobile as well as other environments. The main deliverable of the observed project was a cross-platform...

    Provided By University of Oulu

  • White Papers // Apr 2011

    Key Agreement Based on Homomorphisms of Algebraic Structures

    The authors give a generalization of the Diffie-Hellman key agreement scheme that is based on the hardness of computing homomorphic images from an algebra to another. They formulate computational and decision versions of the homomorphic image problem and devise a key agreement protocol that is secure in the Canetti-Krawczyk model...

    Provided By University of Oulu

  • White Papers // Mar 2011

    Camera-Based Motion Recognition for Mobile Interaction

    Multiple built-in cameras and the small size of mobile phones are underexploited assets for creating novel applications that are ideal for pocket size devices, but may not make much sense with laptops. In this paper the authors present two vision-based methods for the control of mobile user interfaces based on...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Cross-Layer Energy Analysis of Multi-Hop Wireless Sensor Networks

    In this paper, the authors propose a detailed energy survey of the physical, data link, and network layer by analytical techniques. They also show the impact of regular sleep periods on node energy consumption and present a comparison analysis of single-hop vs. multi-hop communications in the energy realm. A detailed...

    Provided By University of Oulu

  • White Papers // Feb 2009

    Implementation of the Least Squares Channel Estimation Algorithm for MIMO-OFDM Systems

    The Least Squares (LS) channel estimation algorithm for a Multiple-Input Multiple-Output (MIMO) system with Orthogonal Frequency Division Multiplexing (OFDM) is considered in this paper. Two architectures for the algorithm are presented and the architectures are implemented using fixed point arithmetic. The minimum word lengths for the implementations are determined through...

    Provided By University of Oulu

  • White Papers // Jan 2011

    Institutional Viewpoint on Wireless Standardisation Process

    The complexity of organizational and technological changes confronting most organizations has made an organizational change and adaptation a topical research question. This paper examines the process of wireless standardization viewpoint and sets out a framework for understanding organizational changes in wireless standardization organizations by applying institutional theory. It is concluded...

    Provided By University of Oulu

  • White Papers // Apr 2010

    Efficiency of the ALOHA Protocol in Multi-Hop Networks

    This paper presents the evaluation of the multi-hop aggregate information efficiency of the slotted and unslotted ALOHA protocols. The authors consider a multi-hop wireless network where the nodes are spatially characterized by a Poisson point process and the traffic generation also follows a Poisson distribution. By applying the properties of...

    Provided By University of Oulu

  • White Papers // Nov 2009

    MEDUSA: Middleware for End-User Composition of Ubiquitous Applications

    Activity-Oriented Computing (AOC) is a paradigm promoting the run-time realization of applications by composing ubiquitous services in the user's surroundings according to abstract specifications of user activities. The paradigm is particularly well-suited for enacting ubiquitous applications. However, there is still a need for end-users to create and control the ubiquitous...

    Provided By University of Oulu

  • White Papers // Aug 2009

    A Review of the Scheduling Problem in Wireless Networks

    The authors describe the fundamental issue of scheduling the allocation of wireless network resources and provide several formulations of the associated problems. The emphasis is on scheduling transmission attempts. They place this problem in the context of existing approaches, like information theoretic and traditional network theoretic ones, as well as...

    Provided By University of Oulu

  • White Papers // Apr 2009

    Short-Range Wireless Sensor Networks for High Density Seismic Monitoring

    Acquisition systems for sub-surface diagnostic (for small earthquake monitoring) and exploration (for new oil and gas reservior) require a large number of sensors (geophones or accelerometers) to be deployed in outdoor over large areas to measure backscattered wave fields. A storage/processing unit (sink node) collects the measurements from all the...

    Provided By University of Oulu

  • White Papers // Aug 2008

    Peer-to-Peer Community Management Using Structured Overlay Networks

    In this paper, the authors present a system for the distributed management of user communities. The system utilizes multiple DHT overlay networks where nodes communicate in a peer-to-peer manner. Their system works on top of a P2PSIP protocol implementation that carries out the DHT signaling. The key idea behind their...

    Provided By University of Oulu

  • White Papers // Aug 2008

    Supporting Session and Access Point Mobility in a Large Multi-Provider Multi-Vendor Municipal WiFi Network

    The authors present a simple network design for a large multi-provider municipal WiFi network where the WiFi zones of multiple organizations are merged into a single IP subnet at a central layer 2 switch. The design provides built-in session mobility support for the WiFi clients using the network, without any...

    Provided By University of Oulu

  • White Papers // Sep 2010

    P2P SCCM: Service-Oriented Community Coordinated Multimedia Over P2P and Experience on Multimedia Annotation Service Development

    Peer-to-Peer Service-oriented Community Coordinated Multimedia (SCCM) is envisioned as a novel paradigm in which the user consumes multiple media through requesting multimedia-intensive Web services via diversity display devices, converged networks, and heterogeneous platforms within a virtual, open and collaborative community in this chapter. A generic P2P SCCM scenario is created...

    Provided By University of Oulu

  • White Papers // Apr 2011

    Robustness of a P2P Community Management System Based on Two-Level Hierarchical DHT Overlays

    The popularity of community-centric applications has rapidly grown during the recent years. In this paper, the authors evaluate the robustness of a P2P community management system, where communities are established as autonomous DHT overlays that are advertised in a global DHT overlay. The evaluation is based on the experimental measurements...

    Provided By University of Oulu

  • White Papers // Jul 2011

    PanOULU: Triple Helix Driven Municipal Wireless Network Providing Open and Free Internet Access

    This paper describes the birth, evolution and current status of a unique wireless city network provided by a consortium of municipalities, public research and educational institutions, and industry. The relevance of the network is illustrated with statistics of providing open and free Internet access to the general public and with...

    Provided By University of Oulu

  • White Papers // Apr 2011

    Distributed Web Service Architecture for Scalable Content Analysis: Semi-Automatic Annotation of User Generated Content

    This paper describes distributed web service architecture to allow web level scalability for multimedia content analysis. The authors introduce service component architecture that allows for orchestration and composition of services as content analysis units to enrich multimedia metadata using common data model built upon MPEG-7 content description standard. They report...

    Provided By University of Oulu

  • White Papers // Jul 2010

    Analysis of Messaging Load in a P2PP Overlay Network Under Churn

    The authors analyze the performance of a DHT-based P2P overlay network in resource access and overlay maintenance activities. They use a cross-platform implementation of the protocol called P2PP. Mobile systems are the main target platform of the protocol implementation; due to practical reasons, they conduct large-scale evaluations using a server...

    Provided By University of Oulu