COGnitive radio systems for efficient sharing of TV white spaces in EUropean context (COGEU) is a threeyear Specific Target Research Project (STREP) supported by the EU 7th Framework Program which concluded in 2013. This paper presents the COGEU TV white space (TVWS) radio transceiver, a key demonstrator and deliverable of the project. The demonstrator consists of a Software Defined Radio (SDR)...

this qualitative study was conducted to identify the factors and barriers of entrepreneurship development from the perspective of iranian entrepreneurs. in terms of purpose, this study is applied- developmental and it is performed via descriptive phenomenological method. qualitative content analysis was used to collect the data. the study population comprised of recorded interviews with the ent...

We study time-varying semidefinite programs (TV-SDPs), which are whose data (and solutions) functions of time. Our focus is on the setting where vary polynomially with show that under a strict feasibility assumption, restricting solutions to also be polynomial time does not change optimal value TV-SDP. Moreover, by using Positivstellensatz (positive locus theorem) univariate matrices, we best s...

A copula density is the joint probability density function (PDF) of a random vector with uniform marginals. An approach to bivariate copula density estimation is introduced that is based on a maximum penalized likelihood estimation (MPLE) with a total variation (TV) penalty term. The marginal unity and symmetry constraints for copula density are enforced by linear equality constraints. The TV-M...

Consuming mobile TV services is becoming increasingly popular. As hand held devices are personal and used in a “lean-forward” mode, they are well suited for interactive TV. The porTiVity system provides authoring tools for mobile interactive content that allow attaching interactivity to moving objects in a TV program. We describe automatic and semi-automatic annotation tools that create content...