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Université de Neuchâtel

Improving the Dependability of Prefix-Based Routing in DHTs

Serbu, Sabina ; Kropf, Peter ; Felber, Pascal

In: Lecture notes in computer science (LNCS), 2007, vol. 4803, p. 206-225

Under frequent node arrival and departure (churn) in an overlay network structure, the problem of preserving accessibility is addressed by maintaining valid entries in the routing tables towards nodes that are alive. However, if the system fails to replace the entries of dead nodes with entries of live nodes in the routing tables soon enough, requests may fail. In such cases, mechanisms to route...

Université de Neuchâtel

The GIPSY Architecture

Paquet, Joey ; Kropf, Peter

In: Lecture notes in computer science (LNCS), 2000, vol. 1830, p. 144-153

Intensional Programming involves the programming of expressions placed in an inherent multidimensional context space. It is an emerging and highly dynamic domain of general application. The fast growing computer connectivity allows for more and more efficient implementation of distributed applications. The paradigm of intensionality inherently includes notions of parallelism at different levels....

Université de Neuchâtel

A Workflow-Oriented System Architecture for the Management of Container Transportation

Bassil, Sarita ; Keller, Rudolf K. ; Kropf, Peter

In: Lecture notes in computer science (LNCS), 2004, vol. 3080, p. 116-131

In this paper, we introduce a workflow-oriented system architecture for the processing of client requests (CRs) for container transportation. In the context of multi-transfer container transportation, the processing of CRs can be achieved by specific sequences of interdependent activities. These sequences need to be just-in-time created. They also need to be adapted to deal with unexpected events...

Université de Neuchâtel

SecAdvise: A Security Mechanism Advisor

Saliba, Rima ; Babin, Gilbert ; Kropf, Peter

In: Lecture notes in computer science (LNCS), 2002, vol. 2468, p. 309-344

The proliferation of incompatible e-commerce systems applying different security technologies imposes difficult choices on all the concerned parties. In this context, the purpose of this research is to provide the necessary background to develop a security advisor (SecAdvise), which will make it possible to integrate the security mechanisms and the dynamic selection of the various mechanisms...

Université de Neuchâtel

Message Chains and Disjunct Paths for Increasing Communication Performance in Large Networks

Wulff, Markus ; Kropf, Peter ; Unger, Herwig

In: Lecture notes in computer science (LNCS), 2000, vol. 1830, p. 122-132

In this paper we propose a simple powerful method to increase communication performance in large networks such as the Internet. Our approach is based on the usage multiple disjunct paths for the transmitting data from one node to another one. The method exploits the dense connectivity of the Internet by making use of the different routes engaged in communications originating from different nodes...

Université de Neuchâtel

Optimisation of Distributed Communities Using Cooperative Strategies

Yuen, Saiho ; Kropf, Peter ; Babin, Gilbert

In: Lecture notes in computer science (LNCS), 2002, vol. 2346, p. 153-168

The complex structure of the Web requires decentralised, adaptive mechanisms efficiently providing access to local and global capacities. To facilitate the development of such mechanisms, it seems reasonable to build clusters of machines with similar structures and interests. In such a manner, communities of machines can be built. In a community, every machine contributes to the overall success...

Université de Neuchâtel

Experimenting with Gnutella Communities

Vaucher, Jean ; Babin, Gilbert ; Kropf, Peter ; Jouve, Thierry

In: Lecture notes in computer science (LNCS), 2002, vol. 2468, p. 255-257

Computer networks or distributed systems in general may be regarded as communities where the individual components, be they entire systems, application software or users, interact in a shared environment. Such communities dynamically evolve with components or nodes joining and leaving the system. Their own individual activities affect the community’s behavior and vice versa. This paper...

Université de Neuchâtel

A Structured Peer-to-Peer System with Integrated Index and Storage Load Balancing

Le, Viet-Dung ; Babin, Gilbert ; Kropf, Peter

In: Lecture notes in computer science (LNCS), 2006, vol. 3908, p. 41-52

Load balancing emerges as an important problem that affects the performance of structured peer-to-peer systems. This paper presents a peer-to-peer system relying on the partitionning of a de Bruijn graph. The proposed system integrates mechanisms that perform index and storage load balancing. Index load refers to the network traffic incurred by a peer in managing an object index, while storage...

Université de Neuchâtel

Distributed Lookup in Structured Peer-to-Peer Ad-Hoc Networks

Kummer Raphaël ; Kropf, Peter ; Felber, Pascal

In: Lecture notes in computer science (LNCS), 2006, vol. 4276, p. 1541-1554

Various peer-to-peer (P2P) architectures for ad-hoc networks have been proposed over the last few years. Most of them are unstructured and use some form of flooding to locate content, because the physical constraints of the underlying network make the construction of arbitrary application-layer overlays impractical. In this paper, we study the problem of applying distributed hash tables (DHT) to...

Université de Neuchâtel

Multi-item auctions for automatic negotiation

Benameur, Houssein ; Chaib-draaa, Brahim ; Kropf, Peter

In: Information and Software Technology, 2002, vol. 44, no. 5, p. 291-301

Available resources can often be limited with regard to the number of demands. In this paper we propose an approach for solving this problem, which consists of using the mechanisms of multi-item auctions for allocating the resources to a set of software agents. We consider the resource problem as a market in which there are vendor agents and buyer agents trading on items representing the...