In wireless communication, relays are devices that receive and forward radio signals. Relays are attractive as they can increase the coverage of cellular networks. Moreover, relays improve the robustness of the wireless radio communication as they create additional signal paths. In this thesis, we propose novel schemes for oneand two-way communication in wireless relay networks. We aim to selec...

We tackle the problem of new users or documents in collaborative filtering. Generalization over users by grouping them into user groups is beneficial when a rating is to be predicted for a relatively new document having only few observed ratings. The same applies for documents in the case of new users. We have shown earlier that if there are both new users and new documents, two-way generalizat...

We describe a new elementary reduction of two-way automata to one-way automata. The reduction is based on the subset construction rather than on crossing sequence analysis.

Functional transductions realized by two-way transducers (equivalently, by streaming transducers and by MSO transductions) are the natural and standard notion of"regular"mappings from words to words. It was shown in 2013 that it is decidable if such a transduction can be implemented by some one-way transducer, but the given algorithm has non-elementary complexity. We provide an algorithm of dif...

The Traffic Engineering Department of the City of Fort Wayne recently conducted a before-and-after study of traffic volume trends and speed-delays encountered on the east and west one-way street system now in operation as compared to two-way street movement. This study was confined to the central business district only, as the traffic survey and recommendations were basically confined within th...

an infinitely long hollow cylinder containing isotropic linear elastic material is considered under the effect of arbitrary boundary stress and thermal condition. the two-dimensional coupled thermoelastodynamic pdes are specified based on equations of motion and energy equation, which are uncoupled using nowacki potential functions. the laplace integral transform and bessel-fourier series are u...

We consider ideals and Boolean combinations of ideals. For the regular languages within these classes we give expressively complete automaton models. In addition, we consider general properties of regular ideals and their Boolean combinations. These properties include effective algebraic characterizations and lattice identities. In the main part of this paper we consider the following determini...

In [2], Blum and Hewitt introduced a two-dimensional finite automaton which can be considered as a natural extension of the one-dimensional two-way finite automaton [4] to two dimensions. On the other hand, in [7,8], Rosenfeld introduced a new type of automaton on a two-dimensional tape (called the three-way two-dimensional finite automaton) which can be considered as a natural extension of the...