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- Sanjoy K. Baruah, Vincenzo Bonifaci, +4 authors Leen Stougie
- ECRTS
- 2012

—Systems in many safety-critical application domains are subject to certification requirements. For any given system, however, it may be the case that only a subset of its functionality is safety-critical and hence subject to certification; the rest of the functionality is non safety critical and does not need to be certified, or is certified to a lower… (More)

We consider the scheduling of mixed-criticality task systems, that is, systems where each task to be scheduled has multiple levels of worst-case execution time estimates. We design a scheduling algorithm, EDF-VD, whose effectiveness we analyze using the processor speedup metric: we show that any 2-level task system that is schedulable on a unit-speed… (More)

- Sanjoy K. Baruah, Vincenzo Bonifaci, +4 authors Leen Stougie
- MFCS
- 2010

Many safety-critical embedded systems are subject to certification requirements; some systems may be required to meet multiple sets of certification requirements, from different certification authorities. Certification requirements in such " mixed-criticality " systems give rise to interesting scheduling problems , that cannot be satisfactorily addressed… (More)

- Yair Bartal, Stefano Leonardi, Alberto Marchetti-Spaccamela, Jirí Sgall, Leen Stougie
- SIAM J. Discrete Math.
- 1996

We consider a version of multiprocessor scheduling with the special feature that jobs may be rejected at a certain penalty. An instance of the problem is given by m identical parallel machines and a set of n jobs, each job characterized by a processing time and a penalty. In the on-line version the jobs become available one by one and we have to schedule or… (More)

- Luca Becchetti, Alberto Marchetti-Spaccamela, Andrea Vitaletti, Peter Korteweg, Martin Skutella, Leen Stougie
- ACM Trans. Algorithms
- 2006

A sensor network consists of sensing devices which may exchange data through wireless communication; sensor networks are highly energy constrained since they are usually battery operated. Data aggregation is a possible way to save energy consumption: nodes may delay data in order to aggregate them into a single packet before forwarding them towards some… (More)

- Alberto Marchetti-Spaccamela, Umberto Nanni, Hans Rohnert
- Inf. Process. Lett.
- 1996

We present two <i>space bounded</i> random sampling algorithms that compute an approximation of the number of triangles in an undirected graph given as a stream of edges. Our first algorithm does not make any assumptions on the order of edges in the stream. It uses space that is inversely related to the ratio between the number of triangles and the number… (More)

- Daniele Frigioni, Alberto Marchetti-Spaccamela, Umberto Nanni
- J. Algorithms
- 2000

Constraint-based approaches recently brought new insight into our understanding of metabolism. By making very simple assumptions such as that the system is at steady-state and some reactions are irreversible, and without requiring kinetic parameters, general properties of the system can be derived. A central concept in this methodology is the notion of an… (More)

- Luca Becchetti, Stefano Leonardi, Alberto Marchetti-Spaccamela, Kirk Pruhs
- J. Discrete Algorithms
- 2001

In this paper we study some aspects of weighted flow time. We first show that the online algorithm Highest Density First is an O(1)-speed O(1)-approximation algorithm for P |r i , pmtn| w i F i. We then consider a related Deadline Scheduling Problem that involves minimizing the weight of the jobs unfinished by some unknown deadline D on a uniprocessor. We… (More)