We consider the problem of on-the-fly detection of temporal changes in the cognitive state of human subjects due to varying levels of difficulty of performed tasks using real-time EEG and EOG data. We construct the Cognitive State Indicator (CSI) as a function that projects the multidimensional EEG/EOG signals onto the interval Œ0; 1 by maximizing the Kullback-Leibler distance between distribu...

In this paper we address the design of a multiple transmit antenna system in which the Channel State Information (CSI) at the transmitter is not perfect. Two different approaches are analyzed one based on the Minimization of the Mean Square Error (MMSEj and the other based on the application of the Maximum Likelihood Sequence Estimation (MLSE). In both cases a Bayesian criterion is used in orde...

The optimization of the Downlink (DL) scheduling in wireless systems that utilize Orthogonal Frequency Division Multiple Access (OFDMA) requires knowledge of the Channel State Information (CSI) for each user and subchannel at the Base Station (BS). This requires a prohibitively high amount of channel resources in Uplink (UL). We focus on the problem of CSI feedback by UL Random Access (RA). Our...

ABSTRACT We consider the problem of optimal power allocation in an MISO system with perfect/partial channel state information (CSI) at the transmitter and perfect CSI at the receiver. Unlike other recent work, we consider power allocation in space and time. In addition to providing substantial reduction in BER, this control surprisingly provides exponential diversity order for a Rayleigh fading...

This paper presents a novel approach to investigate ergodic mutual information of OFDMA Selection-Decode-and-Forward (SDF) cooperative relay networks with imperfect channel state information (CSI). Relay stations are either dedicated or non-dedicated (i.e., subscriber stations assisting other subscriber stations). The CSI imperfection is modeled as an additive random variable with known statist...

Personalized recommendation attracts a surge of interdisciplinary researches. Especially, similarity based methods in applications of real recommendation systems achieve great success. However, the computations of similarities are overestimated or underestimated outstandingly due to the defective strategy of unidirectional similarity estimation. In this paper, we solve this drawback by leveragi...

This paper provides an empirical investigation of the hypothesis that companies engage in corporate social responsibility (CSR) in order to offset corporate social irresponsibility (CSI). We find general support for the relationship that when companies do more “harm,” they also do more “good.” The empirical analysis is based on an extensive 15-year panel dataset that covers nearly 3,000 publicl...

The aim of this study was to evaluate the influence of cigarette smoke inhalation (CSI) and its cessation on tibiae bone quality. Forty-one male Wistar rats were randomly assigned to one of the following groups: Group 1--control (n = 14), Group 2--3 months of CSI and 2 months without exposure to CSI (n = 12), and Group 3--5 months of CSI (n = 15). At the end of the experimental period, the anim...

Adaptive MIMO-OFDM systems employing eigenmode based signalling have a great potential to increase the spectral efficiency when the channel state information (CSI) is accurately known at transmitter (TX) side. However, the perfect CSI is a too strong assumption for a wireless system operating in frequency selective channels. In the presence of CSI errors, the eigenmodes orthogonality is lost an...

In this paper, we develop a method for the quantitative modeling of a Customer Satisfaction Index (CSI) function for consumer vehicles. The mathematical model is evolved using an evolutionary computation technique such that the satisfied and dissatisfied customers are equally distributed on either side of the mean satisfaction level. Instead of relying on a conventional survey based assessment,...