School of Computer and Communication Sciences (I&C)

Michael Lehning1, Mathias Bavay1, Henning Löwe1, Marc Parlange2 und Karl Aberer3 1 WSL Eidgenössisches Institut für Schnee-und Lawinenforschung SLF, Flüelastrasse 11, CH-7260 Davos Dorf 2 Ecole Polytechnique Fédérale Lausanne, GR A0 392 (Bâtiment GR), Station 2, CH-1015 Lausanne 3 Ecole Polytechnique Fédérale Lausanne, BC 108 (Bâtiment BC), Station 14, CH-1015 Lausanne lehning@ slf. ch, bavay@ slf. ch, loewe@ slf. ch, marc. parlange@ epfl. ch, karl. aberer@ epfl. ch den.

Abstract Cooperative work on shared information requires different kinds of computing system support to coordinate the work of multiple users, to establish mutual awareness among users, and to ensure the consistency of user results. These issues are currently tackled separately in various loosely related areas, such as workflow systems, groupware, and advanced transactional models.

Abstract Cooperative work on shared information requires different kind of computing system support to coordinate the work of multiple users, to establish mutual awareness and to ensure consistency. These issues are currently tackled separately in various loosely related areas, like workflow systems, groupware, and advanced transactional models.

Abstract Research on Web credibility assessment can significantly benefit from new models that are better suited for evaluation and study of adversary strategies. Currently employed models lack several important aspects, such as the explicit modeling of Web content properties (eg presentation quality), the user economic incentives and assessment capabilities. In this paper, we introduce a new, game-theoretic model of credibility, referred to as the Credibility Game.

P-Grid [1] is a structured peer-to-peer (P2P) system based on a distributed hash table (DHT). An illustration of a P-Grid tree can be seen in Figure 1. Each peer has a path, a binary string that gives the position of a peer in the tree (paths are shown in gray in Figure 1). Peers can have the same path and become replicas of each other.

Peer-to-peer (P2P) computing is attracting enormous media attention, spurred by the popularity of file sharing systems such as Napster, Gnutella, and Morpheus. The peers are autonomous, or as some call them, first-class citizens. P2P networks are emerging as a new distributed computing paradigm for their potential to harness the computing power of the hosts composing the network and make their under-utilized resources available to others.

Abstract Reputation systems offer a viable solution to the old problem of encouraging trustworthy behavior in online communities. Their key presumptions are that the participants of an online community engage in repeated interactions and that the information about their past doings is informative of their future performance and as such will influence it. Thus, collecting, processing, and disseminating the feedback about the participants' past behavior is expected to boost their trustworthiness.

Abstract This paper analyzes the impact of multimedia data on database management systems and proposes some solutions which allow for a high degree of integrated handling of multimedia data by a multimedia database system. We first give a characterization of multimedia data with respect to issues like time dependency and amount of data. Then we derive major requirements which need to be satisfied in order to provide the integration.

Abstract. Sensor network deployments have become a primary source of big data about the real world that surrounds us, measuring a wide range of physical properties in real time. With such large amounts of heterogeneous data, a key challenge is to describe and annotate sensor data with high-level metadata, using and extending models, for instance with ontologies.

Abstract In this report, to the best of our ability, we try to summarize the presentations and discussions occurred within the First IEEE International Workshop on Networking Meets Databases (NetDB) which was held in Tokyo Japan on April 8th and 9th, 2005. NetDB was one of the many (11 to be exact) satellite workshops of the IEEE ICDE (International Conference on Data Engineering) 2005 conference. This workshop is part of the very few initiatives in bringing the networking and database communities together.

1. Executive Summary This deliverable seeks to provide an Internet Science Survey. Since “Internet Science” is still more of an ultimate goal of this NoE than “a reality”, this survey aims at presenting the different and usually unsynchronized efforts to study and understand Internet from different perspectives and disciplines.

Abstract. The correct functioning of a peer-to-peer network relies on cooperative behavior of peers as service providers. Current approaches to detection and deterrence of non-cooperative behavior, such as reputation systems, rely on (1) global sharing of observations about service provisioning and (2) global authentication. These two factors severely impair the practical applicability.

As a member of the consortium for the" Computation and Prediction of Receptor− Ligand Interaction" the Integrated Publication and Information Systems Institute, GMD− IPSI, Darmstadt, participates in the national joint project RELIWE. Docking− D is the part of RELIWE which considers heterogeneous database support and in which GMD− IPSI takes the leading role. In the current situation the receptor and ligand data used within the project, either raw data or data derived during analysis, is extremely heterogeneous.

ABSTRACT In highly interactive multimedia applications startup latency is significant, and may negatively impact performance and Quality of Service (QoS). To avoid this, our approach is to admit whole multimedia sessions instead of single media streams. For the prediction of the varying resource demands within a session, which are mainly correlated to user behavior, we model user behavior as Continuous Time Markov Chains (CTMCs). In this paper, we propose a mathematical analysis of the CTMC model.

Abstract We introduce a model for information management in a world where information from the physical environment is gathered through a ubiquitous wireless infrastructure. Thus the Internet information space and the physical environment become increasingly entangled in what we call a smart Earth. We illustrate technical challenges and applications from the work of the Swiss national competence centre of research in mobile information and communication systems (NCCR-MICS).

Abstract—A growing amount of data is produced daily resulting in a growing demand for storage solutions. While cloud storage providers offer a virtually infinite storage capacity, data owners seek geographical and provider diversity in data placement, in order to avoid vendor lock-in and to increase availability and durability. Moreover, depending on the customer data access pattern, a certain cloud provider may be cheaper than another.

Abstract In this paper we discuss the problem of data-oriented partitioning in large-scale overlay networks, as required by peer-to-peer databases or by peer-to-peer information retrieval. The goal is to partition a large set of nodes into k partitions with the additional requirement of meeting certain load-balancing constraints without global knowledge of the network's parameters, ie, the desired number of partitions and the partition distribution function are not known in advance and change dynamically as the network evolves.

Abstract A sliding-window k-NN query (k-NN/w query) continuously monitors incoming data stream objects within a sliding window to identify k closest objects to a query. It enables effective filtering of data objects streaming in at high rates from potentially distributed sources, and offers means to control the rate of object insertions into result streams.

Abstract As sensors continue to proliferate, the capabilities of effectively querying not only sensor data but also its metadata becomes important in a wide range of applications. This paper demonstrates a search system that utilizes various techniques and tools for querying sensor metadata and visualizing the results. Our system provides an easy-to-use query interface, built upon semantic technologies where users can freely store and query their metadata.