We consider bicolored maps, i.e. graphs which are drawn on surfaces, and construct a bijection between (i) oriented maps with arbitary face structure, and (ii) (weighted) non-oriented maps with exactly one face. Above, each non-oriented map is counted with a multiplicity which is based on the concept of the orientability generating series and the measure of orientability of a map. Our bijection...

the aim of the present research was to identity and to present the optimum state of iran sport media management from the viewpoints of top media and sport specialists. to achieve an optimum theory, q method was used. a researcher-made questionnaire consisting of 60 questions was designed using the 7-point likert scale and its validity was confirmed by specialists and university professors. stat...

Alliances represent a variety of governance contexts, and hence provide a rich empirical setting for studying the value-creation mechanisms of Information Technology (IT). We examine the influence of IT investment and flexible IT infrastructure, through Service Oriented Architecture (SOA), in the effect of alliance activity on firm performance. We find that the marginal contribution of each joi...

Due to the data sparsity problem, social network information is often additionally used to improve the performance of recommender systems. While most existing works exploit social information to reduce the rating prediction error , e.g., RMSE, a few had aimed to improve the top-k ranking prediction accuracy . This paper proposes a novel top-k ranking oriented recommendation method, TRecSo , whi...

Oriented textures are characterised by a dominant orientation at each point of the texture, and can be summarised by images encoding these dominant orientations. Because of the angular values in these images, standard morphological operators are not suited to their treatment. We discuss the application of the morphological circular centred operators to the analysis of oriented textures for the ...

The existing standard for object-oriented databases (ODMG) provides no facility for storing behaviour. This lack of stored behaviour introduces problems for generic applications as well as multimedia and federated database systems. Research by others on this issue has resulted in proprietary solutions using non-standard object-oriented database models. This paper discusses types of behaviour in...

This article introduces a concurrent object oriented language whose underlying operational semantics is based on the logic variable. The language is designed in reponse to Kahn’s criticisms [Kahn 89] of previous attempts to build concurrent object-oriented languages on top of concurrent logic languages. We believe Aldwych is a language which removes the verbosity of concurrent logic language co...

$top$-filters can be used to define $top$-convergence spaces in the lattice-valued context. Connections between $top$-convergence spaces and lattice-valued convergence spaces are given. Regularity of a $top$-convergence space has recently been defined and studied by Fang and Yue. An equivalent characterization is given in the present work in terms of convergence of closures of $top$-filters.  M...

in the present study, field oriented control of step motor implementation has been analyzed sothat it can make a sensorless control. efficiency and facilities of step motor is more than othertypes of electromotor. therefore, the numbers of mechanisms and different types of turning canbe made into them. also controlling these motors is easier than other available motors. steppingmotor has been d...