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Helsinki University of Technology
(146 results)-
White Papers
Wireless LAN Technology: Current State and Future Trends
January 1, 2007, 12:00am PST
In this paper, a comprehensive overview of the current state and future trends of Wireless Local Area Network (WLAN) has been presented. This paper studies and compares two most competing...
Provided by Helsinki University of Technology
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White Papers
Filtering SPAM in P2PSIP Communities With Web of Trust
April 17, 2009, 12:00am PDT
Spam is a dominant problem on email systems today. One of the reasons is the lack of infrastructure for security and trust. As Voice over IP (VoIP) communication becomes increasingly popular,...
Provided by Helsinki University of Technology
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White Papers
Cloud Computing: Utility Computing Over the Internet
April 27, 2009, 12:00am PDT
Cloud computing has become a hot topic in the IT industry, as it allows people to buy computing resources in the same way as utility services like water and power. Cloud computing services are...
Provided by Helsinki University of Technology
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White Papers
Cloud Computing With the Azure Platform
April 27, 2009, 12:00am PDT
Software industry is heading towards centralized computing. Due to this trend data and programs are being taken away from traditional desktop PCs and placed in compute clouds instead. Compute...
Provided by Helsinki University of Technology
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White Papers
Orthogonal Frequency Division Multiplexing (OFDM)
May 22, 2001, 12:00am PDT
OFDM is a promising candidate for achieving high data rate transmission in mobile environment. The application of OFDM to high data rate mobile communication system is being investigated by many...
Provided by Helsinki University of Technology
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White Papers
A Knowledge-Based Model for Analyzing GSM Network Performance
November 15, 2005, 12:00am PST
In this paper, a method to analyze GSM network performance on the basis of massive data records and application domain knowledge is presented. The available measurements are divided into variable...
Provided by Helsinki University of Technology
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White Papers
Environmental Independence: BSD Kernel TCP/IP in Userspace
February 4, 2009, 12:00am PST
Code is code. In the entire application stack only a very small fraction of code is special in the sense that it requires the hardware to run in privileged mode. In theory all the rest can run in...
Provided by Helsinki University of Technology
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White Papers
Security Issues for Wearable Computing and Bluetooth Technology
May 18, 2006, 12:00am PDT
Bluetooth is a short-range wireless cable replacement technology enabling restricted types of ad hoc networks to be formed. All the while, a need for connecting wearable devices, such as PDAs,...
Provided by Helsinki University of Technology
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White Papers
Mobile Broadband Wireless Access
April 23, 2006, 12:00am PDT
Mobile broadband wireless access is needed to provide advanced telecommunications services effectively and affordably to consumers around the world. This paper evaluates the current commercial...
Provided by Helsinki University of Technology
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White Papers
From Quality of Service to Quality of Experience
November 5, 2009, 12:00am PST
This paper gives detail of the Dagstuhl Seminar 09192 on "From Quality of Service to Quality of Experience " held in Schloss Dagstuhl, Leibniz Center for Informatics from May 05 to May 08, 2009....
Provided by Helsinki University of Technology
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White Papers
Design and Operation of Energy-Efficient Data Centers
April 10, 2009, 12:00am PDT
Data centers are facilities containing many server computers. Their financial and social importance is greater than ever due to growing amount of data and hosted applications used by millions of...
Provided by Helsinki University of Technology
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White Papers
Requirements On Unique Identifiers For Managing Product Lifecycle Information - Comparison Of Alternative Approaches
November 25, 2009, 12:00am PST
Managing product information for product items during their whole lifetime is challenging, especially during their usage and end-of-life phases. The main difficulty is to maintain a communication...
Provided by Helsinki University of Technology
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White Papers
Evaluation And Organization Of Futures Research Methodology
April 14, 2009, 12:00am PDT
This paper focuses on how to create value and meaning for users of the Millennium Project's "Futures Research Methodology - Version 3.0" report. The concept of a boundary object is used to provide...
Provided by Helsinki University of Technology
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White Papers
Mobile IP as an Enabling Technology for VoIP in Metropolitan Wireless Mesh Networks
February 8, 2008, 12:00am PST
Metropolitan wireless mesh networks are being deployed to provide broadband connectivity to city-wide hotspots. However, its commercial feasibility and business model have not yet proven...
Provided by Helsinki University of Technology
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White Papers
A Comparison of Mobile Payment Procedures in Finnish and Chinese Markets
June 17, 2009, 12:00am PDT
Researchers are particularly interested in factors that affect the adoption, innovations and diffusion of mobile payment, which is a typical and wide application of ICTS (Information Communication...
Provided by Helsinki University of Technology
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White Papers
Mobile Payment as Key Factor for Mobile Commerce Success
April 17, 2008, 12:00am PDT
Mobile commerce was expected to flourish with the advent of 3G technologies. Nevertheless, this business has been growing very slowly and up to now has not reached a real success. This paper shows...
Provided by Helsinki University of Technology
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White Papers
Usability Testing for Secure Device Pairing in Home Networks
July 21, 2007, 12:00am PDT
Setting up a secure communication channel between wireless devices is a crucial part of secure communications. Usually, it is done by non-expert user's with-out knowledge or interest in security...
Provided by Helsinki University of Technology
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White Papers
MMS (Multimedia Messaging Service) Enabled Web Map Dispatching Solution for Location Enhanced Fieldwork Management
January 1, 2010, 12:00am PST
Field workers, such as service men, perform every day many different tasks at different locations. Work-orders can be in well-known locations, e.g. weekly checks. But most service companies get...
Provided by Helsinki University of Technology
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White Papers
The Evolution of Wireless Home Networking
May 30, 2007, 12:00am PDT
The home networking market is growing rapidly and wireless technologies play an important role in the most home networks. This paper identifies and describes the main areas of networking. Using a...
Provided by Helsinki University of Technology
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White Papers
Wiring Devices and Technologies in Home Environment
May 21, 2007, 12:00am PDT
This paper reviews and compares technologies that home users can use to build their home networks. The focus of this review is on technologies that need no rewiring, i.e. they use existing wires...
Provided by Helsinki University of Technology
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White Papers
XML-Based E-Business Frameworks and Supply Chain Integration
October 17, 2007, 12:00am PDT
Although information and communication technologies have opened up new possibilities of doing business, supply chain integration, especially exchange of business documents in business processes,...
Provided by Helsinki University of Technology
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White Papers
Business Models And Evolving Economic Paradigms: A Systems Science Approach
July 18, 2008, 12:00am PDT
In developed economies, however, the service sector now dominates the manufacturing sector, just as manufacturing prevailed over the agricultural sector after the industrial revolution....
Provided by Helsinki University of Technology
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White Papers
Grid Computing Aptitude of Well-Known Charity or Other Non-Profit Organizations
January 1, 2011, 12:00am PST
Grid computing is a form of distributed computing where a centralized client computer distributes computations among a large number of server computers. There exists several grid computing...
Provided by Helsinki University of Technology
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White Papers
Zeroconf and UPnP Techniques
March 5, 2007, 12:00am PST
Configuration of network devices seamlessly and without any user configuration is a principle of the Zeroconf and the UPnP techniques. The Zeroconf has several implementations and probably the...
Provided by Helsinki University of Technology
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White Papers
Flexible Single Sign-On for SIP: Bridging the Identity Chasm
March 24, 2008, 12:00am PDT
Identity federation is a key requirement for today's distributed services. This technology allows managed sharing of users' identity Information between Identity Providers (IDP), and subsequently,...
Provided by Helsinki University of Technology
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White Papers
Secure Computing: SELinux
October 12, 2007, 12:00am PDT
Using mandatory access control greatly increases the security of an operating system. SELinux, which is an implementation of Linux Security Modules (LSM), implements several measures to prevent...
Provided by Helsinki University of Technology
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White Papers
Middlewares for Home Monitoring and Control
April 18, 2007, 12:00am PDT
Home networks are just about to enter millions of private homes. They will connect a large variety of devices including home appliances, consumer electronics, white goods, and telecommunication...
Provided by Helsinki University of Technology
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White Papers
A Survey on Virtual Machine Security
December 19, 2007, 12:00am PST
Virtualization plays a major role in helping the organizations to reduce the operational cost, and still ensuring improved efficiency, better utilization and flexibility of existing hardware....
Provided by Helsinki University of Technology
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White Papers
Why and How to Block Skype
March 5, 2007, 12:00am PST
Skype has become a very popular Voice-over-Internet Protocol (VoIP) service that was designed with many smart characteristics. Nevertheless, it also has some security vulnerabilities that can be...
Provided by Helsinki University of Technology
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White Papers
Efficient Physically-Based Shadow Algorithms
September 30, 2006, 12:00am PDT
This research focuses on developing efficient algorithms for computing shadows in computer-generated images. A distinctive feature of the shadow algorithms presented in this paper is that they...
Provided by Helsinki University of Technology
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White Papers
Topical Evolution Paths of Mobile Multimedia Services
September 19, 2007, 12:00am PDT
The objective of this paper is to study the current state of the Finnish mobile market. This has been done with a mobile operator centric view. Based on a literature study and continuous...
Provided by Helsinki University of Technology
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White Papers
Identity Federation and Identity Providers
April 29, 2008, 12:00am PDT
Identity management is one of the fastest growing areas in the security market. Currently organizations have several identity and access right repositories - often one for each IT...
Provided by Helsinki University of Technology
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White Papers
Mashup Security
April 11, 2008, 12:00am PDT
This paper considers the issue of mashup security. The most important technologies used in creating mashups, like Ajax, and the basic functionality behind the mashups are introduced shortly. After...
Provided by Helsinki University of Technology
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White Papers
Windows CardSpace
December 12, 2006, 12:00am PST
Windows CardSpace allows users to manage their digital identities from various identity providers and offers a consistent user interface for controlling what information they are sending about...
Provided by Helsinki University of Technology
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White Papers
Are We Living in 1984
December 12, 2006, 12:00am PST
Orwell's vision of Big Brother could be done with current technology. However there are some constitutional rights and laws than guarantee privacy. Then again rising threat of terrorism has...
Provided by Helsinki University of Technology
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White Papers
Role of Ethics in Pervasive Computing Security
December 12, 2006, 12:00am PST
The importance of awareness with regard Information Systems (IS) security has been recently acknowledged. This paper studies the applicability of one aspect of the awareness approach, namely...
Provided by Helsinki University of Technology
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White Papers
Honeypotting With Solaris
October 12, 2007, 12:00am PDT
Attack is the best defence, it is said. This paper is about honeypots, which are good counter-measure to detect intrusions and abnormal activity in the Internet of these days. Since security in...
Provided by Helsinki University of Technology
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White Papers
User Authentication in SIP
December 12, 2006, 12:00am PST
Today Voice over Internet Protocol (VoIP) is used in large scale to deliver voice and multimedia over the packet data networks, such as the Internet. The Session Initiation Protocol (SIP) is...
Provided by Helsinki University of Technology
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White Papers
Tag, You're It - NFC in a Home Environment
March 5, 2007, 12:00am PST
This paper envisions the application of Near Field Communication (NFC) in a home environment. Several NFC solutions are currently available in the logistics industry relying on Radio Frequency...
Provided by Helsinki University of Technology
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White Papers
Distributed AAA
December 12, 2006, 12:00am PST
With the increase in the number of wireless users and proliferation of ubiquitous computing it also becomes necessary to distribute the AAA entities and AAA services. Distribution of AAA entities...
Provided by Helsinki University of Technology
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White Papers
Text and Language Independent Speaker Identification by Using Short-Time Low Quality Signals
March 17, 2008, 12:00am PDT
Several speaker identification applications that exploit voice signals recorded by using wireless networks of small, low-power acoustic sensors are becoming feasible. However, the acoustic signals...
Provided by Helsinki University of Technology
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White Papers
Privacy Challenges of Open APIs: Case LBS
December 2, 2010, 12:00am PST
Many of the most popular Location-Based Services (LBSs) have recently released open APIs for developers in order to extend their services to third party applications. With this strategy, LBSs try...
Provided by Helsinki University of Technology
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White Papers
Peer-to-Peer Communication
January 1, 2012, 12:00am PST
Internet has changed a lot since its early days. At the beginning, goal of the Internet was to share computing resources between universities and scientists. In those days communication happened...
Provided by Helsinki University of Technology
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White Papers
Practical Approaches to Adaptive Resource Allocation in OFDM Systems
September 28, 2007, 12:00am PDT
Whenever a communication system operates in a time-frequency dispersive radio channel, the link adaptation provides a benefit in terms of any system performance metric by employing time,...
Provided by Helsinki University of Technology
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White Papers
On Throughput-Fairness Tradeoff in Virtual MIMO Systems with Limited Feedback
January 24, 2009, 12:00am PST
The authors investigate the performance of channel-aware scheduling algorithms designed for the downlink of a wireless communication system. Their study focuses on a two-transmit antenna cellular...
Provided by Helsinki University of Technology
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White Papers
Time Synchronization of Cognitive Radio Networks
March 26, 2009, 12:00am PDT
In this paper, a novel synchronization protocol is proposed especially for Cognitive Radio (CR) networks called CR-Sync. In a CR network, time synchronization is indispensable because of the...
Provided by Helsinki University of Technology
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White Papers
Mechanisms of Reducing Reauthetication Delay on IEEE 802.11 WLANs
June 22, 2009, 12:00am PDT
In this paper, the authors present of mechanisms for reducing re-authentication delay in Institute of Electrical and Electronics Engineers (IEEE) 802.11 Wireless Local Area Networks (WLAN). They...
Provided by Helsinki University of Technology
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White Papers
Location Integrity in Mobile Ad-Hoc and Peer-to-Peer Networks
April 27, 2009, 12:00am PDT
Existing mobile peer-to-peer solutions focus on improving the operation of peer-to-peer networks by inventing better routing algorithms or new ways of discovering or transferring data in order to...
Provided by Helsinki University of Technology
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White Papers
Mobile Agent Based Architecture for Wireless Sensor Networks
April 27, 2009, 12:00am PDT
Wireless Sensor Networks (WSN) has emerged as one of the key growth areas for wireless networking and computing technologies. Usually in sensor networking, traditional client-server computing...
Provided by Helsinki University of Technology
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White Papers
Middleware for Wireless Sensor Networks :Challenges and Approaches
April 27, 2009, 12:00am PDT
Nowadays, WSNs are becoming increasingly attractive to researchers and industries due to wide range of applications. A WSN is consists of large numbers of small scale sensing nodes capable of...
Provided by Helsinki University of Technology
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White Papers
An Evaluation Framework for Middleware Approaches on Wireless Sensor Networks
April 27, 2009, 12:00am PDT
This paper presents an evaluation framework for middleware designs on Wireless Sensor Networks (WSNs). There is lots of existing middleware solutions for WSNs; the authors introduced middleware...
Provided by Helsinki University of Technology
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White Papers
On Maximizing Throughput Under Optimum Energy With Inter-Session Network Coding in Wireless Networks
April 27, 2009, 12:00am PDT
Network Coding (NC) has emerged in the last couple of years as a significant mechanism to improve network throughput as well as to efficiently utilize the bandwidth in communication networks....
Provided by Helsinki University of Technology
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White Papers
Adopting Internet Protocols to Sensor Internetworking
April 27, 2009, 12:00am PDT
Recent research in the area of the Wireless Sensor Networks (WSN) has shown that protocols most commonly used today in the Internet can be implemented within energy and memory constraints of the...
Provided by Helsinki University of Technology
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White Papers
Energy-Efficient Parallel Software for Mobile Hand-Held Devices
April 11, 2011, 12:00am PDT
Energy efficiency is an essential design criterion for mobile hand-held devices. The authors underline the issue that parallel programs for mobile devices must be efficiently executable on the...
Provided by Helsinki University of Technology
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White Papers
Network Coding in Wireless Environment
April 20, 2008, 12:00am PDT
An approach called network coding is a new research area that could dramatically enhance the reliability and efficiency of practical networking systems. Network coding can enable intermediate...
Provided by Helsinki University of Technology
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White Papers
Empirical Modelling of the Mobile VoIP Demand
March 21, 2008, 12:00am PDT
This paper first discusses the future of mobile Internet voice and possible technical service evolution paths. Three main fundamental drivers of mobile VoIP (Voice over IP) diffusion are...
Provided by Helsinki University of Technology
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White Papers
Running an i3 Overlay Network on Top of AODV
January 1, 2011, 12:00am PST
Mobile Ad hoc NETworks (MANETs) and Peer-To-Peer (P2P) overlay networks share many key features. Both can be viewed as decentralized self-organizing networks. Both usually have flat address spaces...
Provided by Helsinki University of Technology
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White Papers
Influence of Antenna Radiation Pattern on Accuracy of ToA Estimation
September 30, 2009, 12:00am PDT
Ultra-WideBand (UWB) signals have very large bandwidth which allow accurate ranging using time domain techniques. Precise UWB ranging requires accurate estimation of Time of Arrival (ToA). Several...
Provided by Helsinki University of Technology
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White Papers
An Evaluation of Security Protocols on Wireless Sensor Network
April 16, 2009, 12:00am PDT
In recent years, Wireless Sensor Network (WSN) is employed in many application areas such as environmental monitoring, and battle field strategy planning. For many applications of WSN, security is...
Provided by Helsinki University of Technology
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White Papers
Impact of Size-Based Scheduling on Flow Level Performance in Wireless Downlink Data Channels
January 1, 2011, 12:00am PST
The authors analyze the impact of size-based scheduling on the flow level performance of elastic traffic in wireless downlink data channels. The impact is assessed by comparing the flow level...
Provided by Helsinki University of Technology
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White Papers
Approximating Maximum Directed Flow in a Large Wireless Network
February 28, 2009, 12:00am PST
The authors study the maximum forwarding capacity for the relay traffic that can be transmitted through a wireless multi-hop network in a single direction. The problem appears as the microscopic...
Provided by Helsinki University of Technology
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White Papers
On Traffic Load Distribution and Load Balancing in Dense Wireless Multihop Networks
March 13, 2007, 12:00am PDT
The authors study the load balancing problem in a dense wireless multi-hop network, where a typical path consists of a large number of hops, that is, the spatial scales of a typical distance...
Provided by Helsinki University of Technology
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White Papers
On the Optimality of Field-Line Routing in Massively Dense Wireless Multi-Hop Networks
March 5, 2009, 12:00am PST
The authors consider the load balancing problem in large wireless multi-hop networks by applying the continuum approximation. The task is to find routes, geometric curves, such that the maximal...
Provided by Helsinki University of Technology
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White Papers
A Translation-Based Approach to the Verification of Modular Equivalence
August 10, 2007, 12:00am PDT
In this paper, a method for verifying the equivalence of logic program modules under a Gaifman-Shapiro-style module architecture is proposed. The idea is to adapt a translation-based verification...
Provided by Helsinki University of Technology
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White Papers
Implementing Prioritized Circumscription by Computing Disjunctive Stable Models
June 18, 2008, 12:00am PDT
The stable model semantics of disjunctive logic programs is based on minimal models which assign atoms false by default. While this feature is highly useful and leads to concise problem encodings,...
Provided by Helsinki University of Technology
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White Papers
Security of Wireless Sensor Network
April 19, 2009, 12:00am PDT
Wireless Sensor Networks (WSN) is an emerging technology and day by day it is attracting the attention of researchers with its challenging characteristics and diversified application domain. The...
Provided by Helsinki University of Technology
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White Papers
Comparing Various Realizations of the Cloud Computing Paradigm
December 2, 2010, 12:00am PST
Cloud Computing is becoming attractive these days. Many big companies, such as Google, Amazon and IBM, have promoted their own cloud computing platforms for customers to deploy their web...
Provided by Helsinki University of Technology
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White Papers
Strong Authentication With Mobile Phones
December 2, 2010, 12:00am PST
Many of the services that people use daily, for example banking, have transformed from traditional customer services into Internet services. In important services, such as the banking, a strong...
Provided by Helsinki University of Technology
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White Papers
Comparison Between Security Solutions in Cloud and Grid Computing
December 2, 2010, 12:00am PST
This paper helps Grid and Cloud system administrators and researchers to have a clear definition about Grid and Cloud computing and also wants to give clear differences between Cloud and Grid...
Provided by Helsinki University of Technology
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White Papers
A Long-Tail Model of Mobile Application Usage
June 28, 2010, 12:00am PDT
In management research, the long tail phenomenon is typically linked to the long-tail of product demand distribution, particularly under electronic distribution, storing and consumption of...
Provided by Helsinki University of Technology
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White Papers
Towards High Quality VoIP in 3G Networks an Empirical Study
March 20, 2008, 12:00am PDT
Third Generation (3G) packet switched WCDMA networks with high-speed downlink packet access (HSPDA) are currently being deployed worldwide to provide wireless broadband connectivity. When...
Provided by Helsinki University of Technology
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White Papers
On Securing Dynamic Home Agent Address Discovery of On-Board Mobile Router in Mobile IPv6 Networks
February 19, 2008, 12:00am PST
In on-board mobile networks, users are connected to a local network that attaches to the Internet via a mobile router and a wireless link. The mobile router has a central role in servicing the...
Provided by Helsinki University of Technology
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White Papers
MOBNET: The Design and Implementation of a Network Mobility Testbed for NEMO Protocol
January 1, 2011, 12:00am PST
The inherent difficulty in faithfully modeling wireless channel characteristics in simulators has prompted researchers to build wireless network testbeds for realistic testing of protocols. While...
Provided by Helsinki University of Technology
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White Papers
Multidimensional Walsh Transform and a Characterization of Bent Functions
July 17, 2007, 12:00am PDT
In this paper, a multidimensional Walsh transform is used to obtain a characterization of vector-valued bent function in terms of the value distributions of the translates of the function by...
Provided by Helsinki University of Technology
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White Papers
Modular Answer Set Programming
December 21, 2006, 12:00am PST
Answer Set Programming (ASP) is a declarative rule-based constraint programming paradigm. In ASP the problem at hand is solved declaratively by writing down a logic program the answer sets of...
Provided by Helsinki University of Technology
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White Papers
Intermediate Languages of ASP Systems and Tools
May 2, 2007, 12:00am PDT
In Answer Set Programming (ASP), a search problem is solved by describing its solutions in the input language of an answer set solver which is then used to compute solutions to the problem....
Provided by Helsinki University of Technology
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White Papers
Distributed Algorithms for Lifetime Maximization in Sensor Networks via Min-Max Spanning Subgraphs
February 1, 2008, 12:00am PST
The authors consider the problem of static transmission-power assignment for lifetime maximization of a wireless sensor network with stationary nodes operating in a data-gathering scenario. Using...
Provided by Helsinki University of Technology
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White Papers
Distributed Computation of Maximum Lifetime Spanning Subgraphs in Sensor Networks
September 16, 2007, 12:00am PDT
The authors present a simple and efficient distributed method for determining the transmission power assignment that maximizes the lifetime of a data-gathering wireless sensor network with...
Provided by Helsinki University of Technology
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White Papers
Lifetime Maximization in Wireless Sensor Networks by Distributed Binary Search
November 5, 2007, 12:00am PST
The authors consider the problem of determining the transmission power assignment that maximizes the lifetime of a data-gathering wireless sensor network with stationary nodes and static...
Provided by Helsinki University of Technology
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White Papers
Balanced Multipath Source Routing
July 10, 2007, 12:00am PDT
The authors consider the problem of balancing the traffic load ideally over a wireless multi-hop network. In previous work, a systematic approach to this task was undertaken, starting with an...
Provided by Helsinki University of Technology
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