flooding is not possible. The application of routing indexes is a commonly used technique to avoid this. Promising techniques to further reduce execution costs and interesting aspects are query operators like top-N and skyline, constraints, and the relaxation of exactness and/or completeness requirements

. Thus, parties and leaders use access to power as ways to obtain resources for their trade. Political corruption becomes a systemic feature of information age politics. Since character assassination needs some substance from time to time, systemic political corruption provides ample opportunity, as a

Making use of the wealth of new observational data coming from the sky it is possible to constrain particle physics theories beyond the Standard Model. One way to do this is illustrated in this article: a subset of theories admits cosmic string solutions, topologically stable matter field

10 − 13 Gyrs ago. Gaia will be the first instument to constrain the bright end of the field halo WDLF, where contributions from binary WDs are considerable. Many of these will have He cores, of which a handful have atypical surface gravities (log g < 6) and reach luminosities log(L/L)> 0 in our

Abstract—This paper studies Gaussian Two-Way Relay Chan-nel where two communication nodes exchange messages with each other via a relay. It is assumed that all nodes operate in half duplex mode without any direct link between the communication nodes. A compress-and-forward relaying strategy using

We study highly expressive query languages for unordered data trees, using as formal vehicles Active XML and extensions of languages in the while family. All languages may be seen as adding some form of control on top of a set of basic pattern queries. The results highlight the impact and interplay

then extend this approach to the collaborative case, where a set of simultaneously coded signals share the same sparsity pattern at the higher (group) level, but not necessarily at the lower (inside the group) level, obtaining the collaborative HiLasso model (C-HiLasso). Such signals then share the same

Relativistic Cosmology, while Section 2 deals with the spatially homogeneous models. Particular attention is paid to the topological and geometrical aspects of these models. Section 3 explains how the mathe-matical formalism can be linked with astronomical observation. Sections 4 and 5 provide a critical

Despite being a core networking primitive, collection protocols today often suffer from poor reliability (e.g., 70%) in practice, and heavily used protocols have never been evaluated in terms of communication efficiency. Using detailed experimental studies, we describe three challenges that cause

The recent discovery of dark energy has prompted an investigation of ways in which the accelerated expansion of the universe can be realized. In this dissertation, we present two separate projects related to dark energy. The first project analyzes a class of braneworld models in which multiple