The dynamic polarizability and optical absorption spectrum of liquid water in the 6-15 eV energy range are investigated by a sequential molecular dynamics (MD)/quantum mechanical approach. The MD simulations are based on a polarizable model for liquid water. Calculation of electronic properties relies on time-dependent density functional and equation-of-motion coupled-cluster theories. Results ...

the Secondary users can run to sense the channel cooperatively. It is based on sequential detection algorithms which optimally use the past observations. We use the algorithm on secondary users with energy detectors although it can be used with matched filter and other spectrum sensing algorithms also. The algorithm provides very low detection delays and also consumes little energy. Furthermore...

In this paper, we investigate a cooperative spectrum sharing mechanism realized by a dynamic Bayesian spectrum bargaining between a pair of non-myopic primary user and secondary user. The primary user has only incomplete information of the secondary user’s energy cost. We model such a bargaining process as a dynamic Bayesian game, and discuss the equilibria under all possible system parameters....

Cognitive radio (CR) has evolved as a novel technology for overcoming the spectrum-scarcity problem in wireless communication networks. With its opportunistic behaviour improving spectrum-usage efficiency, CR enables desired secondary users (SUs) to dynamically utilize idle spectrum owned by primary users. On sensing identify frequency bands, proper spectrum-allocation mechanisms need be design...

Distributed spectrum sensing (DSS) enables a Cognitive Radio (CR) network to reliably detect licensed users and avoid causing interference to licensed communications. The data fusion technique is a key component of DSS. We discuss the Byzantine failure problem in the context of data fusion, which may be caused by either malfunctioning sensing terminals or Spectrum Sensing Data Falsification (SS...

CONTEXT It has been suggested that patients with major depressive disorder (MDD) who display pretreatment features suggestive of bipolar disorder or bipolar spectrum features might have poorer treatment outcomes. OBJECTIVE To assess the association between bipolar spectrum features and antidepressant treatment outcome in MDD. DESIGN Open treatment followed by sequential randomized controlle...

Abstract This article proposed an angle measurement method based on second harmonic generation (SHG) using artificial neural network (ANN). The comprises three sequential parts: SHG spectrum collection, data preprocessing, and training. First, the referenced angles spectrums are collected by autocollimator SHG-based sensor, respectively, for mapping is learned trained ANN after completing train...

Despite the increasing number of students on autism spectrum attending regular schools worldwide, research knowledge and use teaching strategies to support inclusion in South Asian region remains scarce. The current study was informed by Florian Spratt’s Inclusive Pedagogy Framework utilised an exploratory sequential mixed-method design investigate Bhutanese teachers’ pedagogical for spectrum. ...

With the increasing demands for radio spectrum, techniques are being explored that would allow dynamic access of spectrum bands that are underutilized. In this regard, a new paradigm called dynamic spectrum access is being investigated where wireless service providers (WSPs) would dynamically seek more spectrum from the under-utilized licensed bands when and where they need without interfering ...