Freij-HollantiAalto University

Ragnar Freij-Hollanti

Postdoctoral Researcher, Department of Mathematics and Systems Analysis

What do you do?

What do you do?

I am interested in algebraic combinatorics, especially graph theory, polytope theory and the (combinatorial and topological) theory of partial orders. In my current research, I am working on applying these and related fields to coding, communications and information theory.

With members from the research group for Algebra, Number Theory and Applications (ANTA), I am collaborating on matroid theory applied to data storage systems. In particular, I am working on bounds and constructions for locally repairable codes and private information retrieval.

I am a coorganisor of the AScI Large structures seminar.

My most accurate and reliable publication list can be found at Google Schoolar

Where do you come from?

Where do you come from=

2016-2017, Postdoctoral researcher; Dept. of Mathematics and Systems Analysis, Aalto University; Finland

2014-2016, Postdoctoral researcher; Dept. of Communications and Networking, Aalto University; Finland

2012-2014, Postdoctoral researcher; Dept. of Mathematics and Systems Analysis, Aalto University; Finland

2007-2012, PhD Student; Dept. of Mathematical Sciences, Chalmers University of Technology; Sweden.

CV

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CV

My CV, including a publication list is downloadable.

Contact information

Preferred contact method
E-mail
Work email
ragnar.freij at aalto.fi
Personal mobile phone
+358 44 2377293

Publications

Peer-reviewed scientific articles

Journal article-refereed, Original research

On the Combinatorics of Locally Repairable Codes via Matroid Theory

Westerbäck, Thomas; Freij-Hollanti, Ragnar; Ernvall, Toni; Hollanti, Camilla 

2016 

IEEE TRANSACTIONS ON INFORMATION THEORY 

ISSN: 0018-9448 

Constructions and Properties of Linear Locally Repairable Codes

Ernvall, Toni; Westerbäck, Thomas; Freij-Hollanti, Ragnar; Hollanti, Camilla 

2016 

IEEE TRANSACTIONS ON INFORMATION THEORY 

ISSN: 0018-9448 

Face numers of centrally symmetric polytopes produced from split graphs

Freij, Ragnar; Henze, Mattias; Schmitt, Moritz; Ziegler, Günter 

2013 

ELECTRONIC JOURNAL OF COMBINATORICS 

ISSN: 1097-1440 

Partially ordered secretaries

Freij, Ragnar; Wästlund, Johan 

2010 

ELECTRONIC COMMUNICATIONS IN PROBABILITY 

Equivariant discrete Morse theory

Freij, Ragnar 

2009 

DISCRETE MATHEMATICS 

ISSN: 0012-365X 

Enumeration of derangements with descents in prescribed positions

Eriksen, Niklas; Freij, Ragnar; Wästlund, Johan 

2009 

ELECTRONIC JOURNAL OF COMBINATORICS 

ISSN: 1097-1440 

Conference proceedings

Bounds on the maximal minimum distance of linear locally repairable codes

Pöllänen, Antti; Westerbäck, Thomas; Freij-Hollanti, Ragnar; Hollanti, Camilla 

2016 

IEEE International Symposium on Information Theory 

Institute of Electrical and Electronics Engineers Inc. 

ISBN: 978-1-5090-1806-2 

ISSN: 2157-8095 

Relay selection and resource allocation for D2D-relaying under uplink cellular power control

Deng, Junguan; Dowhuszko, Alexis A.; Freij, Ragnar; Tirkkonen, Olav 

2016 

Institute of Electrical and Electronics Engineers Inc. 

ISBN: 9781467395267 

A connection between locally repairable codes and exact regenerating codes

Ernvall, Toni; Westerbäck, Thomas; Freij-Hollanti, Ragnar; Hollanti, Camilla 

2016 

IEEE International Symposium on Information Theory 

Institute of Electrical and Electronics Engineers Inc. 

ISBN: 978-1-5090-1806-2 

ISSN: 2157-8095 

Applications of polymatroid theory to distributed storage systems

Westerbäck, Thomas; Freij-Hollanti, Ragnar; Hollanti, Camilla 

2016 

Institute of Electrical and Electronics Engineers Inc. 

ISBN: 9781509018239 

Shifted de Bruijn Graphs

Freij, Ragnar 

2014 

SPRINGER 

Enumeration of derangements with descents in prescribed positions

Eriksen, Niklas; Freij, Ragnar; Wästlund, Johan 

2009 

Publications intended for professional communities

Article in professional conference proceedings

Locally repairable codes with availability and hierarchy: matroid theory via examples

Freij-Hollanti, Ragnar; Westerbäck, Thomas; Hollanti, Camilla 

2016 

ETH Zürich 

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