The study of this paper focuses on the power angle spectrum (PAS) of the satellite communication downlink in rain environment at millimeter-wave bands. The two-dimension angle distribution expression of the incoherent intensity of the ground receiving antenna in rain is deduced in detail. The coherent intensity is discussed according to the first-order multiple scattering approximation theory. ...

To use type Ia supernovae as standard candles for cosmology we need accurate broadband magnitudes. In practice the observed magnitude may differ from the ideal magnitude-redshift relationship either through intrinsic inhomogeneities in the type Ia supernova population or through observational error. Here we investigate how we can choose filter bandpasses to reduce the error caused by both these...

Neighbour discovery is the determination of all nodes in the network that can communicate with a given node. Routing typically begins with neighbour discovery. Discovering neighbours should be both quick as well as energy efficient. Many algorithms which mostly work at a protocol level had been developed for neighbour discovery. Here a new method for neighbour node discovery that maximizes netw...

Collaborative Learning is emerging as an important learning method. Computer and network supported collaborative learning systems and environments are starting to appear. In order that these systems contribute positively into the educational process, it is important to consider quality requirements. This paper presents the CLE (Collaborative Learning Evaluation), a framework for evaluating Coll...

how does a journalist or an editor decide which news is worthy and which is not? according to some media researchers, they refer to a set of news values. one of the best known lists of such news values have been supplied by johan galtung and marie h. ruge. an analytical discussion on news values always refers to this list, which initially intended to cover international events. these factors i...

The article examines the local dimension of alternative social media for period 2020. object study is communication channels in Mariupol. aims to determine characteristics and their types. problem monopolization and/or reduction traditional at level leads emergence popularity platforms on media. systematizes characteristics, topics content common communication. Anonymity, personalization public...

Due to their compact size, sensitivity, and ability to be multiplexed, intrinsic Fabry-Perot interferometers (IFPIs) are excellent candidates for almost any multi-point temperature or strain application, and it is well-known that using a single-mode lead-in fiber, a multimode fiber section as the Fabry-Perot cavity, and an additional single-mode fiber as the tail results in a structure that gen...

In this paper, a joint transmitter and receiver design for pattern division multiple access (PDMA) is proposed. At the transmitter, pattern mapping utilizes power allocation to improve the overall sum rate, and beam allocation to enhance the access connectivity. At the receiver, hybrid detection utilizes a spatial filter to suppress the interbeam interference caused by beam domain multiplexing,...

We propose adaptively secure attribute-based encryption (ABE) schemes for boolean formulas over large universe attributes from the decisional linear (DLIN) assumption, which allow an arbitrary number of attribute reuse in an available formula without the previously employed redundant multiple encoding technique. Based on the key-policy (KP)ABE scheme, we have an adaptively secure communication-...