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Approximation Algorithms for Allocation and Network Design

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Pliable Index Coding

Christina Fragouli, Siddhartha Brahma

We propose a new formulation of the index coding problem, where instead of demanding a specific message, clients are “pliable” and are happy to receive any one message they do not have. We prove that with this relaxation, although some instances of this pr ...

Ieee2012

MPTCP is not Pareto-Optimal: Performance Issues and a Possible Solution

Jean-Yves Le Boudec, Nicolas Gabriel Gast, Ramin Khalili, Utkarsh Upadhyay, Miroslav Popovic

MPTCP has been proposed recently as a mechanism for sup- porting transparently multiple connections to the applica- tion layer. It is under discussion at the IETF. We show, however, that the current MPTCP suffers from two prob- lems: (P1) Upgrading some TC ...

2012

Tight Approximation Algorithms for Scheduling with Fixed Jobs and Nonavailability

Ola Nils Anders Svensson, Klaus Jansen

We study two closely related problems in nonpreemptive scheduling of jobs on identical parallel machines. In these two settings there are either fixed jobs or nonavailability intervals during which the machines are not available; in both cases, the objecti ...

Assoc Computing Machinery2012

A transformable tensegrity-ring footbridge

Ian Smith, Landolf-Giosef-Anastasios Rhode-Barbarigos, René Motro

Tensegrity structures are spatial reticulated structures composed of cables and struts. A tension-compression equilibrium leads to lightweight systems that change shape through length changes in their members. Active members thus control several degrees of ...

2012

Scaladoc Diagrams for Class Hierarchies

Damien Obrist

On numerous occasions it has been pointed out that the class hierarchy of the Scala standard library is hard to follow. This project aims at addressing the problem by automatically generating interactive class hierarchy diagrams in the scaladoc tool. ...

2012

Santa Claus schedules jobs on unrelated machines

Ola Nils Anders Svensson

One of the classic results in scheduling theory is the 2-approximation algorithm by Lenstra, Shmoys, and Tardos for the problem of scheduling jobs to minimize makespan on unrelated machines, i.e., job j requires time p ij if processed on machine i. More th ...

ACM2011

Hardness Of Precedence Constrained Scheduling On Identical Machines

Ola Nils Anders Svensson

In 1966, Graham showed that a simple procedure called list scheduling yields a 2-approximation algorithm for the central problem of scheduling precedence constrained jobs on identical machines to minimize makespan. To date this has remained the best algori ...

2011

The School Bus Problem on Trees

Laura Sanità, Adrian Aloysius Bock

The School Bus Problem is an NP-hard vehicle routing problem in which the goal is to route buses that transport children to a school such that for each child, the distance travelled on the bus does not exceed the shortest distance from the child's home to ...

Springer-Verlag Berlin2011

Covering Cubes and the Closest Vector Problem

Friedrich Eisenbrand, Martin Niemeier, Nicolai Hähnle

We provide the currently fastest randomized (1+epsilon)-approximation algorithm for the closest vector problem in the infinity-norm. The running time of our method depends on the dimension n and the approximation guarantee epsilon by 2^(O(n))(log(1/epsilon ...

Acm Order Department, P O Box 64145, Baltimore, Md 21264 Usa2011

Deterministic algorithm for the cooperative data exchange problem

Michael Christoph Gastpar, Sameer Pawar

Download Citation Email Print Request Permissions Save to Project In this paper we study the problem of data exchange, where each node in the system has a number of linear combinations of the data packets. Communicating over a public channel, the goal is f ...

IEEE2011