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- Stephan Olariu, Ivan Stojmenovic
- Proceedings IEEE INFOCOM 2006. 25TH IEEE…
- 2006

— This paper investigates theoretical aspects of the uneven energy depletion phenomenon recently noticed in sink-based wireless sensor networks. We consider uniformly distributed sensors, each sending roughly the same number of reports toward the closest sink. We assume an energy consumption model governed by the relation E = d α +c where d, (d ≤ t x), is… (More)

- Bruno Courcelle, Stephan Olariu
- Discrete Applied Mathematics
- 2000

A graph complexity measure that we call clique-width is associated in a natural way with certain graph decompositions, more or less like tree-width is associated with tree-decomposition which are, actually, hierarchical decompositions of graphs. In general, a decomposition of a graph G can be viewed as a nite term, written with appropriate operations on… (More)

- Koji Nakano, Stephan Olariu
- IEEE Trans. Parallel Distrib. Syst.
- 2000

ÐAd hoc networks are self-organizing entities that are deployed on demand in support of various events including collaborative computing, multimedia classroom, disaster-relief, search-and-rescue, interactive mission planning, and law enforcement operations. One of the fundamental tasks that have to be addressed when setting up an ad hoc network (AHN, for… (More)

This chapter reviews a number of emerging topics pertaining to a data-centric view of wireless sensor networks. These topics include data-driven routing, tracking mobile objects, constructing and maintaining reporting trees, dynamic evolution of a monitoring region for moving targets (mobicast), disseminating monitoring tasks, data gathering, receiving… (More)

- Luitpold Babel, Stephan Olariu
- Discrete Applied Mathematics
- 1998

We present new classes of graphs for which the isomorphism problem can be solved in polynomial time. These graphs are characterized by containing { in some local sense { only a small number of induced paths of length three. As it turns out, every such graph has a unique tree representation: the internal nodes correspond to three types of graph operations,… (More)

An independent set of three vertices such that each pair is joined by a path that avoids the neighborhood of the third is called an asteroidal triple. A graph is asteroidal triple-free (AT-free) if it contains no asteroidal triples. The motivation for this investigation was provided, in part, by the fact that the AT-free graphs provide a common… (More)

- Derek G. Corneil, Hiryoung Kim, Sridhar Natarajan, Stephan Olariu, Alan P. Sprague
- Inf. Process. Lett.
- 1995

We present a linear time algorithm for unit interval graph recognition. The algorithm is simple and based on Breadth-First Search. It is also direct | it does not rst recognize the graph as an interval graph. Given a graph G, the algorithm produces an ordering of the vertices of the graph whenever G is a unit interval graph. This order corresponds to the… (More)

- Ashraf Wadaa, Stephan Olariu, Larry Wilson, Mohamed Eltoweissy, K. Jones
- MONET
- 2005

- Mona E. Rizvi, Stephan Olariu, Hussein M. Abdel-Wahab
- IEEE Trans. Parallel Distrib. Syst.
- 2002

ÐNow that cellular networks are being called upon to support real-time interactive multimedia traffic such as video tele-conferencing, these networks must be able to provide their users with quality-of-service (QoS) guarantees. Although the QoS provisioning problem arises in wireline networks as well, mobility of hosts, scarcity of bandwidth, and channel… (More)

- Mohammad S. Almalag, Stephan Olariu, Michele C. Weigle
- 2012 IEEE International Symposium on a World of…
- 2012

One of the challenges for Vehicular Ad-hoc Networks (VANETs) is the design of the Medium Access Control (MAC) protocol. When exchanging messages between vehicles, there are network issues that must be addressed, including the hidden terminal problem, high density, high node mobility, and data rate limitations. A cluster-based MAC scheme is needed in VANETs… (More)