32 Resources for

helsinki university

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Near-Optimal Load Balancing in Dense Wireless Multi-Hop Networks: This paper considers the load balancing problem in wireless multi-hop networks. In the limit of a dense network, there is a strong separation between the macroscopic and microscopic scales, and the load balancing problem can be formulated as finding continuous curves ("Routes") between all source-destination pairs that minimize the maximum...; Tags: Load Balancing, Helsinki University, Wireless, Network Technology, Networking; White papers 2008-02-25
Using Artificial Intelligence in Intrusion Detection Systems: Artificial Intelligence could make the use of Intrusion Detection Systems a lot easier than it is today. They could learn the preferences of the security officers and show the kind of alerts first that the officer has previously been most interested. As always, the hardest thing with learning AIs, is...; Tags: Artificial Intelligence, Security Officer, Helsinki University, Intrusion Detection System, AI, Intrusion Detection, Network Security, Security, Networking; White papers 2007-11-19
Load Balancing by Distributed Optimisation in Ad Hoc Networks: This paper approaches the problem of load balancing for wireless multihop networks by distributed optimisation. As an example of a distributed optimisation algorithm for ad hoc networks, an approximation algorithm is used for minimising the maximum network congestion and implements it as a modification of the DSR routing protocol. The...; Tags: Algorithm, Advertisement, Network, Load Balancing, Helsinki University, Engineering, Networking; White papers 2007-07-10
Optimizing Firewall Performance: Firewalls are one key factor in network performance. If they can't process their rules fast enough then the whole network slows down. Firewalls are also required part in every network so special attention must paid to their packet matching algorithms which are studied in this paper along with other rule...; Tags: Algorithm, Network, Helsinki University, Firewalls, Engineering, Network Security, Networking; White papers 2007-04-17
Semantic Service Oriented Architecture to Promote Integration of Heterogeneous B2B Services: Modeling of business services with semantic languages offer flexible integration which is more adaptive to changes in business requirements. In this paper, the authors show how business messages can be semantically represented and how semantics can be used to facilitate a conversation between heterogeneous services with data and process mediation...; Tags: Helsinki University, SOA, B2B, Integration, Service-Oriented Architecture (SOA), Middleware, Web Services, Enterprise Software, Software; White papers 2007-01-09

Wireless LAN Technology: Current State and Future Trends: 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 commercially potential WLAN technologies, namely IEEE 802.11 and ETSI HiperLAN. This study also addresses the challenges of their coexistance and...; Tags: Helsinki University, WLAN, LANs, Wireless LANs, Wi-Fi, Wireless, Network Technology, Networking; White papers 2007-01-01
Vulnerabilities of Intrusion Detection Systems in Mobile Ad-Hoc Networks - The Routing Problem: Intrusion detection systems is one of the most active fields of research in Mobile Ad-hoc Network's MANET field. This systems are usually focused on detecting problems with the routing systems to prevent DoS and Man-in-the-middle and, despite of the amount of papers written which try to solve, many of them...; Tags: Mobile, Network, Vulnerability, Helsinki University, Intrusion Detection System, Intrusion Detection, Network Security, Security, Networking; White papers 2006-11-21
Social Optimality of Alternative Business Models: The purpose of this paper is to introduce some basic terminology of consumer theory and methods for analyzing social optimality. These are then applied to study the social optimality of the main business models in Wireless LAN WLAN Hotspot market these days. The paper has the ambitious target to give...; Tags: Helsinki University, WLAN, Business Model, Wireless LANs, LANs, Strategy, Wi-Fi, Wireless, Networking, Management; White papers 2006-10-23
Multi-Model Security Associations in Personal Networks: The first connect between unknown devices is one of the most security critical phases of the communication in personal networks. Many existing security configuration mechanisms have been vulnerable against passive eavesdropping or active man-in-the-middle attacks or have been ignored by users as too cumbersome. Consequently, attackers have been able to...; Tags: Network, Helsinki University, Association Model, Security, Networking, Wireless; White papers 2006-10-18
Constructing Service Machines - Global Sourcing of Knowledge-Intensive Services: Outsourcing highlights the need for explication and conceptualization of the relationship between the parties involved. Within the Service Sciences, Management and Engineering -framework service production systems can be studied as Service Machines. The machine -metaphor focuses research on the contractual constructions that link together various productive resources and capabilities and...; Tags: Sourcing, Knowledge, Helsinki University, Outsourcing, Purchasing & Procurement, Strategy, Business Operations, Management; White papers 2006-07-01
Performance of TCP on Low-Bandwidth Wireless Links With Delay Spikes: This paper models the goodput of a single TCP source on a wireless link experiencing sudden increases in RTT, i.e., delay spikes. Such spikes trigger spurious timeouts that reduce the TCP goodput. Renewal reward theory is used to derive a straightforward expression for TCP goodput that takes into account limited...; Tags: Performance, Helsinki University, TCP, Tcp/Ip, Networking; White papers 2006-06-21
Jamming Resistant Architecture for WiMAX Mesh Network: The paper presents a jamming resistant architecture for military applications of WiMAX (802.16) mesh network. The main idea is to use multiple Base Stations BS, access points to the fixed core network. This will facilitate network survivability both in case of BS destruction and in case of jamming. When the...; Tags: Network, Helsinki University, Architecture, Idea, Base Stations Architecture, Mesh Networking, WiMAX, Networking, Wireless; White papers 2006-06-14
Mobile Broadband Wireless Access: 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 alternatives to satisfy that need: WiMAX variants, MBWA (IEEE 802.20), Flash-OFDM and 3G technologies. Regulation aspects affect technology adoption and those are discussed along with...; Tags: Mobile, Broadband Wireless, Helsinki University, Wireless Access, Mobile Broadband Wireless Access, 3G, Advertising & Promotion, WiMAX, Wireless, Telecommunications, Cellular Phones, Consumer Electronics, Personal Technology, Marketing; White papers 2006-04-23
Competency Management and Rewarding: In rewarding one current area of interest is skill-based pay or competency-based pay. Many of these pay systems focus on competency development of individual employees. In the domain of competency management exist many variations depending on the theoretical background and on organization's strategy. How can rewarding be planned to support...; Tags: Helsinki University, Competency Management, Strategy, Management; White papers 2006-02-27
National Strategies for Public WLAN Roaming: The global public WLAN market is experiencing constant growth. At the same time the recession in the development of the Finnish mobile data market has generated discussion both in governmental level as well as in business life. This study focuses on exploring means to refresh the development of the Finnish...; Tags: Strategy, Helsinki University, WLAN, Wireless LANs, LANs, Wi-Fi, Wireless, Networking; White papers 2006-02-06
Competitive Potential of WiMAX in the Broadband Access Market: A Techno-Economic Analysis: WiMAX radio networks have been proposed as an alternative technology to provide services for the fixed broadband access market, currently dominated by DSL and cable modem systems. In this paper, the economic feasibility of WiMAX network deployments is analyzed with a quantitative techno-economic model. The model is used to assess...; Tags: Microsoft Access, Network, Broadband, Helsinki University, WiMAX, Wi-Fi, Cable, Wireless, Broadband Internet, Telecommunications, Personal Technology; White papers 2005-05-05
An Interpolation-Based Frequency-Synchronization Scheme for OFDM Systems: The mismatch of the oscillators in the transmitter and receiver, or Doppler shift, introduces an offset in the expected carrier frequency. In orthogonal frequency-division multiplexing OFDM systems, this frequency offset causes large errors in the signal values and therefore it is important to minimize this offset. This paper proposes an...; Tags: Helsinki University, Offset, OFDM, Wireless; White papers 2005-04-28
MIMO-OFDM: The growing demand of multimedia services and the growth of Internet related contents lead to increasing interest to high speed communications. The requirement for wide bandwidth and flexibility imposes the use of efficient transmission methods that would fit to the characteristics of wideband channels especially in wireless environment where the...; Tags: Helsinki University, Narrowband, MIMO-OFDM, OFDM, Wireless; White papers 2005-02-03
Security of Bluetooth: An Overview of Bluetooth Security: Bluetooth is a new technology for wireless communication. The target of the design is to connect different devices together wirelessly in a small environment like in an office or at home. The BT range restricts the environment, which at the moment is about 10 meters. Before accepting the technology a...; Tags: Security, Helsinki University, Bluetooth, Wi-Fi, Wireless; White papers 2000-10-30
Bluetooth Security: Bluetooth is a way of connecting machines to each other without cables or any other physical medium. It uses radio waves to transfer information, so it is very susceptible to attacks. This paper first gives some background information about Bluetooth system and security issues in ad hoc networks, then it...; Tags: Helsinki University, Bluetooth, Wi-Fi, Security, Wireless; White papers 2000-05-25

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