Université de Neuchâtel

Approaches for cloudification of complex high performance simulation systems

Lapin, Andrei ; Kropf, Peter (Dir.) ; Felber, Pascal (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2017.

Scientific computing is often associated with ever-increasing need for computer resources to conduct experiments, simulations and gain outcomes in a reasonable time frame. While local infrastructures could hold substantial computing power and capabilities, researchers may still reach the limit of available resources. With continuously increasing need for higher computing power, one of the...

Université de Neuchâtel

SoftwIre integration : an approach to service composition through distributed representations of arbitrary-length business ontologies

Ludolph, Hendrik ; Kropf, Peter (Dir.) ; Babin, Gilbert (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2016.

The demand for Software as a Service is ever increasing. With this demand comes a proliferation of third-party service offerings to fulfill it. It thus becomes crucial for organizations to find and select the right service to be integrated into their existing tool landscapes. Ideally, this is done automatically and flexibly. The objective is to always provide the best possible support to changing...

Université de Neuchâtel

Information lookup and distribution in mobile ad hoc networks

Kummer, Raphaël ; Kropf, Peter (Dir.) ; Felber, Pascal (Codir.) ; Konstantas, Dimitri (Codir.) ; Olivera, Rui (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2010.

In this thesis, we propose two novel algorithms, a lightweight distributed hash table (DHT) lookup algorithm and a multicast tree building algorithm, specifically designed to take advantages of the major characteristics of mobile ad-hoc networks (MANETs) like broadcast communication, limited resources (particularly energy) physical proximity or multi-hop communication that are often put aside or...

Université de Neuchâtel

Load management in peer-to-peer systems : structures and algorithms

Serbu, Sabina ; Kropf, Peter (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2010 ; Th. 2138.

In this thesis, we present several novel techniques for load management in peer-to-peer systems. We tackle two types of peer-to-peer systems: information lookup systems (in particular DHTs), where we define new load balancing solutions, and information dissemination systems, where we define new methods for load reduction First, we introduce the context of peer-to-peer systems and we elaborate on...

Université de Neuchâtel

Algorithms for statistical model selection and robust estimation

Hofmann, Marc ; Kropf, Peter (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2009 ; Th. 2103.

Computationally intensive algorithms for model selection and robust regression are considered. Particular emphasis is put on regression trees. The QR decomposition is the main computational tool to solve the linear models. Givens rotations are employed to compute the orthogonal factorizations. A new pipelineparallel strategy is proposed for computing the QR decomposition. Algorithms for computing...

Université de Neuchâtel

Visualisation scientifique collaborative

Casera, Steve ; Kropf, Peter (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2007 ; 1949.

La visualisation scientifique est utilisée habituellement pour résoudre des problèmes complexes et analyser des données. La collaboration joue un rôle crucial dans le domaine de la visualisation scientifique. En effet, dans les domaines d’application concernés, il est fréquent que l’on doive recourir aux compétences d’un spécialiste situé à une certaine distance. Dans cette...

Université de Neuchâtel

Numerical algorithms for estimating least squares problems

Yanev, Petko Ivanov ; Kropf, Peter (Dir.)

Thèse de doctorat : Université de Neuchâtel, 2005 ; 1795.

The solution of least squares estimation problems is of great importance in the areas of numerical linear algebra, computational statistics and econometrics. The design and analysis of numerically stable and computationally efficient methods for solving such least squares problems is considered. The main computational tool used for the estimation of the least squares solutions is the QR...