According to International Telecommunication Union (ITU) requirements, future IMT-Advanced systems should support peak data rates of 100 Mbps and 1 Gbps, respectively, in high-speed mobile environment and stationary/pedestrian environment. In order to achieve this goal and evaluate related wireless technologies, we develop a MIMO/OFDM-based TDD-mode Gbps wireless testbed. This article describes...

Flocking is an self-organized behavior that is widely observed in nature from simple organisms such as crickets and locusts to more complex ones such as birds and quadruplets. It can be defined as the coherent and aligned motion of a group of animals at a certain direction. Coherence is the tendency of the individuals to stay together and alignment is a consequence of minimizing collisions at t...

We study the random walk in random environment on Z+ = {0, 1, 2, . . .}, where the environment is subject to a vanishing (random) perturbation. The two particular cases that we consider are: (i) random walk in random environment perturbed from Sinai’s regime; (ii) simple random walk with random perturbation. We give almost sure results on how far the random walker is from the origin, for almost...

The dynamics of mobile systems require applications to intelligently adapt to changes in system configurations and to their environment. We describe a workplace in which users interact with a number of stationary and mobile systems through the course of a day. The relationship between systems and devices is constantly changing due to user mobility. We present a facility for mobile application c...

This paper attempts to analyze the endogenous risk of contagion within an interbank network resulting from an external shock hitting the system. It uses a network formation game theoretic model to investigate the strategic interactions that may be observed once the shock has entered the network and thus endogenized itself. The primary results of this model indicate that the marginal utility tha...

Recent advances in sensor networks and mobile agents have revealed a new set of data management challenges, characterized by highly distributed information gathering at stationary nodes, which are intermittently accessed by roaming mobile nodes. We envisage applications in which the environment is instrumented with a large number of inexpensive computing devices that can store local context inf...

This paper concerns the analysis of temperature time series using the empirical mode decomposition (EMD) and classical identification methods. The temperature time series were measured by meteorological stations which were deployed in the southern part of the Czech Republic. The data analysis was performed in both time and frequency domains. The focus of the work was to investigate the non-stat...

This paper is concerned with the study of the stationary solutions of the equation ut −∇ · (A(x)∇u) = f(x, u), x ∈ R , where the diffusion matrix A and the reaction term f are periodic in x. We prove existence and uniqueness results for the stationary equation and we then analyze the behaviour of the solutions of the evolution equation for large times. These results are expressed by a condition...

The purpose of this study is to establish the firms level aspects which have more influence on the Credit risk managing of domestic and foreign banks in Pakistan. The study is based on secondary data from the period of 2001 to 2010. To check the stationarity of the data, Augmented Dickey Fuller test is used and Johansson’s Co-integration is used for long run relationship. Linear regression mode...