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,...

In this paper, a power-efficient low-complexity iterative receiver structure for noncoherent transmission over Rayleigh flat fading channels without channel state information (CSI) is presented. As the main contribution, several novel decision-feedback assisted differential demodulators are derived, which are well suited to implementation. Thereby, the general case of multiple transmit and mult...

In order to increase the data rate or power efficiency of OFDM systems several adaptive strategies to select the power, modulation and even code rate on a per subcarrier basis have been discussed in literature. The underlying assumption of perfect channel state information (CSI) at the transmitter, however, is hardly fulfilled in practical systems. Hence, either existing approaches have to be m...

Transmission electron microscopy has been employed to study the structure of polycrystalline CsI thin "lms and its transformation under exposure to humid air and UV irradiation. The catastrophic degradation of CsI thin "lm photocathode performance is shown to be associated with the "lm dissolving followed by its re-crystallization. This results in the formation of large lumps of CsI crystal on ...

Foreword Modern wireless systems include key technologies such as multiuser diversity, adaptive transmission, multiple-input multiple-output (MIMO) processing and cooperative data communication networks. Common for all these technologies is that the feedback of channel state information (CSI) is necessary, as it is exploited for adapting the transmission parameters, scheduling, etc. The CSI is ...

PURPOSE A characterization of a clinical unit for digital radiography (FUJIFILM FDR D-EVO) is presented. This system is based on the irradiation side sampling (ISS) technology and can be equipped with two different scintillators: one traditional gadolinium-oxysulphide phosphor (GOS) and a needle structured cesium iodide (CsI) phosphor panel. METHODS The characterization was achieved in terms ...