Tamas Elteto

Tamas Elteto
Ericsson

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21
Publications
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133
Citations

Publications

Publications (21)
Article
Full-text available
In subset ranking, the goal is to learn a ranking function that approximates a gold standard partial ordering of a set of objects (in our case, a set of documents retrieved for the same query). The partial ordering is given by relevance labels representing the relevance of documents with respect to the query on an absolute scale. Our approach consi...
Article
This paper deals with a statistical model fitting procedure for non-stationary time series. This procedure selects the parameters of a piecewise autoregressive model using the Minimum Description Length principle. The existing chromosome representation of the piecewise autoregressive model and its corresponding optimisation algorithm are improved....
Article
Despite intense research on Grid scheduling, differentiated quality of service remains an open question, and no consensus has emerged on the most promising strategy. The difficulties of experimentation might be one of the root causes of this stalling. An alternative to experimenting on real, large, and complex data is to look for well-founded and p...
Conference Paper
Full-text available
In subset ranking, the goal is to learn a ranking function that approximates a gold standard partial ordering of a set of objects (in our case, relevance labels of a set of documents retrieved for the same query). In this paper we introduce a learning to rank approach to subset ranking based on multi-class classification. Our technique can be summa...
Article
Full-text available
We show that a simple boosting-based pointwise ensemble approach with a slight listwise touch at the last combination step is competitive to sophisticated (and computationally expensive) ranking techniques.
Conference Paper
Despite extensive research focused on enabling QoS for grid users through economic and intelligent resource provisioning, no consensus has emerged on the most promising strategies. On top of intrinsically challenging problems, the complexity and size of data has so far drastically limited the number of comparative experiments. An alternative to exp...
Article
Despite extensive research focused on enabling QoS for grid users through economic and intelligent resource provisioning, no consensus has emerged on the most promising strategies. On top of intrinsically challenging problems, the complexity and size of data has so far drastically limited the number of comparative experiments. An alternative to exp...
Conference Paper
Full-text available
This paper deals with the queueing analysis of IP networks carrying streaming traffic. The main focus of the analysis is the jitter which is a widely used performance characteristic of that type of traffic. The study is carried out by a novel technique using Quasi-Birth-Death processes in a matrix-geometric approach. Our method calculates network p...
Article
In this paper we seek particular representations for absolutely continuous Phase-type distributions with 3 distinct real poles. First, we define subsets of these Phase-type distributions given the 3 distinct poles. One subset contains distributions that have upper triangular PH representation of order n, but do not have a triangular one of PH order...
Article
The discrete-time phase type (PH) distributions are used in the numerical solution of many problems. The representation of a PH distribution consists of a vector and a substochastic matrix. The common feature of the PH distributions is that they have rational moment generating function. The moment generating function depends on the eigendecompositi...
Article
A number of existing results describe the numerical calculation of the steady state distribution of an M/G/1/ type Markov chain. However, these numerical methods have difficulties when the forward transition structure has a long tail asymptotic. This paper proposes a numerical approximation that can account for the polynomial decay of the steady-st...
Conference Paper
Some theoretical aspects of data traffic using HTTP (hypertext transfer protocol) are investigated. The purpose of our modelling is to give an analytical method to evaluate the expected performance of data transfer under various circumstances. HTTP/1.1, with and without pipelining and TCP, is in the focus of our study. The performance is mainly inv...
Article
Cell level analysis of ATM networks by means of simulation requires an accurate model for traffic sources. We present a simple model for TCP over ATM traffic sources in an ATM LAN, which captures the fundamental characteristics of the behaviour of TCP in this environment. The model was developed by extensive statistical analysis of numerous traffic...
Article
L’analyse des réseaux atm au niveau des cellules par simulation nécessite un modèle précis des sources de trafic. L’article présente un modèle simple pour du trafic tcp sur atm dans un réseau local d’entreprise atm, qui reproduit les caractéristiques fondamentales du comportement du protocole tcp dans cet environnement. Ce modèle obtenu par analyse...
Conference Paper
This paper discusses some metrics of TCP based on real measurements over the Internet. We present algorithms to measure the congestion window related metrics and use these metrics to study the stationary behavior of TCP. Our statistical analysis shows that the distribution of the congestion window process in a stable period has a bell-like shape an...
Conference Paper
A basic network setup is investigated via measurements and simulation of TCP traffic. Based on our measurements we found that the packet losses occur in the backbone network, in spite of the fact that the majority of packets mainly stays in the routers' queues of the access network. Our conclusion is that the packet loss process is independent of t...
Conference Paper
Full-text available
TCP traffic round-trip delay measurements have been carried out in the Ericsson Corporate Network. Based on these data a comprehensive analysis has been performed to identify basic state changes in the network and to find the parametric distribution of the round-trip delay. The main finding of our research is that the round-trip delay can be well a...
Conference Paper
This paper investigates a queuing system with infinite number of servers where the arrival process is given by a Markov Arrival Process (MAP) and the service time follows a Phase-type (PH) distribution. They were chosen since they are simple enough to describe the model by exact methods. Moreover, highly correlated arrival processes and heavy-taile...
Article
Full-text available
1 Abstract This contribution focuses on web user traffic modeling for radio access networks providing multimedia applications. The main goal is to provide detailed and accurate source models of wireless WWW users suitable for radio access networks. The performed modem pool measurements to define the model parameters are described. Some validation r...

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