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Université de Neuchâtel

Coordinating Plans for Agents Performing AAW Hardkill and Softkill for Frigates

Blodgett, Dale E. ; Paquet, Sébastien ; Plamondon, P. ; Chaib-draaa, Brahim ; Kropf, Peter

In: Intent Inference for Collaborative Tasks, 2001, p. 1-8

The coordination of anti-air warfare (AAW) hardkill (HK) and softkill (SK) weapon systems is an important aspect of command and control for the HALIFAX Class Frigate. This led to the development of a rapid prototyping environment, described here, which supports the investigation of methods to coordinate the plans produced by AAW HK and SK agents. The HK and SK planning agents are described. An...

Université de Neuchâtel

Dynamic Server Selection in Distributed Object Computing Systems

Badidi, Elarbi ; Keller, Rudolf K. ; Kropf, Peter ; van Dongen, Vincent V.

In: Proceedings of the Workshop on Distributed Computing on the Web (DCW’98), 1998, p. 39-47

In this paper, we address the problem of dynamic server selection among a set of objectservers, as the ones defined by CORBA and DCOM, providing the same service type. Theseservers are not necessarily replicas but may have different interfaces and belong to differentservice providers. As a solution, we propose a novel architecture that we call LoDACE. Thisarchitecture has been designed to allow...

Université de Neuchâtel

Simulation of Search and Distribution Methods for Jobs in a WEB Operating System (WOS)

Unger, Herwig ; Kropf, Peter ; Babin, Gilbert ; Böhme, Thomas

In: High Performance Computing Symposium 98, 2008, p. 253-259

Internet or WEB computing concepts, such as the Web Operating System (WOS™), require suitable methods for finding the most effective hardware and software environment for an application execution on the network. We present an efficient search strategy and show that the resulting communication load penalty is well acceptable while preventing the network from being flooded by administrative...

Université de Neuchâtel

Overview About the Resource Scheduling in the Web Operating System (WOS)

Unger, Herwig ; Kropf, Peter

In: Proceedings of the Workshop on Distributed Computing on the Web (DCW’98), 1998, p. 134-140

A number of load sharing/balancing mechanisms were developed in order to improve the execution of a distributed application in a workstation cluster or any other kind of distribute darchitectures. In fact, it would be possible to execute applications on any machine of a world wide system. However, the notion of ‘distributed systems’ has gained in importance and attraction with the...

Université de Neuchâtel

Application layer traffic analysis of a Peer-to-Peer system

Tutsch, Dietmar ; Babin, Gilbert ; Kropf, Peter

In: IEEE Internet Computing, 2008, vol. 12, no. 5, p. 70-77

Self-similar or multifractal behavior has been observed for LAN and Internet WAN (backbone) traffic. Investigations about this kind of behavior for application level protocols are rarely found because sessions or even applications are usually too short to be characterized in this direction. Only Telnet and FTP were examined so far. This paper analyzes the traffic shape of Peer-to-Peer (P2P)...

Université de Neuchâtel

A Model for Error Avoidance and Error Correction in Peer-to-Peer Networks

Spielvogel, Christian ; Serbu, Sabina ; Kropf, Peter ; Felber, Pascal

In: 3rd International Workshop on Semantic Media Adaptation and Personalization, 2008, p. 100-105

Video streaming over best effort networks remains a challenging task. Video quality decreases with the number of frames that are corrupted, lost or received after the playback time. In order to deliver videos in high quality, a model for selecting the proper network-error treatment in a peer-to-peer overlay is presented. Based on the model, the selection is between error avoidance, error...

Université de Neuchâtel

Fault-Tolerant P2P Networks: How Dependable is Greedy Routing

Serbu, Sabina ; Kropf, Peter ; Felber, Pascal

In: Workshop on Dependable Application Support in Self-Organising Networks (DASSON'07), 2007, p. 1

Under churn, the problem of preserving accessibility is addressed by maintaining valid entries in the routing tables towards live nodes. However, if the system fails to replace the entries of dead nodes with entries of live nodes soon enough, requests may fail. In such cases, mechanisms to route around failures are required to increase the tolerance to node failures. Existing DHTs include...

Université de Neuchâtel

Dynamic Load Sharing in Peer-to-Peer Systems: When Some Peers Are More Equal than Others

Serbu, Sabina ; Bianchi, Silvia ; Kropf, Peter ; Felber, Pascal

In: IEEE Internet Computing, 2007, vol. 11, no. 4, p. 53-61

In the past few years, several DHT-based abstractions for peer-to-peer systems have been proposed. The main characteristic is to associate nodes (peers) with keys (objects) and to construct distributed routing structures to support an efficient location. These approaches address the load problem, and load balancing is achieved by moving the keys. However, the problem is still not properly...

Université de Neuchâtel

WOS communities - interactions and relations between entities in distributed system

Kropf, Peter ; Plaice, John

In: Proceedings of the Workshop on Distributed Computing on the Web (DCW'99), 1999, p. 163-167

We describe the interaction and relation between entities in distributed systems, as proposed in the Web Operating System (WOS). Every entity in the system is a versioned object which depends on its current context, which itself is programmable and can be effected by the objects circulating within it. These entities interact through mechanisms of requests/answers and negotiations. Those who...

Université de Neuchâtel

Intensional Communities

Kropf, Peter ; Plaice, John

In: Intensional Programming II, 1999, p. 292-296

We describe the interaction and relation between entities in distributed systems, as proposed in the Web Operating System (WOS). Every entity in the system is a versioned object which depends on its current context, which itself is pro- grammable and can be effected by the objects circulating within it. These entities interact through mechanisms of requests/answers and negotiations. Those who...