Otso Kassinen

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The emergence of new lightweight web technologies and the development of mobile devices leads to a situation, where the users can consume the same web services regardless of the place, time and device. Mobile devices are equipped with networking capabilities and sensors that provide versatile context and user-community information. This information enhances(More)
We 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 settings affect this battery life; this is interesting as mobile access to P2P networks is(More)
In this paper, we propose an advanced model, called e-Aware, for estimating how application layer protocol properties affect the energy consumption of mobile devices, operating in 3G (WCDMA) and WLAN (802.11) networks. The main motivation for the model is to facilitate designing energy-efficient networking solutions, by reducing the need for time-consuming(More)
This paper proposes an intelligent mobile middleware utilizing group-based content push with dynamic session startup and plug-and-play features. Solution enhances the distribution of mobile content, such as game applications or multimedia files, within a peer group community. It exploits the social relationships of the user community to enable instant(More)
We present the feasibility evaluation of a structured communication-oriented Peer-to-Peer (P2P) system being used in mobile environments in this paper. The different levels of churn are modeled by the exponential distribution with varied value of mean online time. Our system utilizes Kademlia with some modifications as the underlying Distributed Hash Table(More)
In this paper, we 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. Our system works on top of a P2PSIP protocol implementation that carries out the DHT signaling. The key idea behind our system is to use one overlay network per community;(More)
1389-1286/$ see front matter 2009 Elsevier B.V doi:10.1016/j.comnet.2009.09.022 * Corresponding author. Address: Department of mation Engineering, University of Oulu, Finland. Te fax: +358 8 553 2534. E-mail addresses: tommy@ee.oulu.fi, firstname (Z. Ou). The phenomenon of churn has a significant effect on the performance of Peer-to-Peer (P2P) networks,(More)
In this paper we provide a case study for implementing peer-to-peer (P2P) and application supernetworking into mobile devices. Paper portrays an empirical study of the implementation process with analysis and discussion. Evaluation of the implementation process is done in respect to system functionality and quality. Especially, implementation and(More)
Contemporary ubiquitous information systems combine efficiently context-aware and peer-to-peer communication concepts. This paper introduces a novel mobile peer-to-peer (P2P) navigation application, NaviP2P. In addition to basic navigation functionalities such as GPS positioning, showing the user location on the map, scrolling and zooming of the map view,(More)