This paper presents an adaptive forward error correction (AFEC) protocol that provides a reliable communication service for real-time trafflc over low-earth orbit (LEO) satellite networks. In time-varying wireless links, such as LEO satellite networks, a reliable channel estimation scheme with an appropriate code selection technique is essential for adaptive error-control systems. This paper pr...

two cases of hydatid cysts of the orbit causing unilateral exophthalmos are reported. diagnosis were suspected by means of computed tomography (ct) and confirmed at operation. ct changes are described and its value in diagnosis of this lesion particularly in the endemic areas is stressed.

Homoclinic bifurcation with one orbit flip, two inclination flips and resonance in the tangent directions of homoclinic orbit is considered. By studying the associated successor functions constructed from a local active coordinate system, we prove the existence of double 1-periodic orbit, 1-homoclinic orbit, and also some coexistence conditions of 1-periodic orbit and 1-homoclinic orbit.

We present a spectroscopic analysis of the bright Be star Κ Dra. Two independent sets radial velocity (RV) measurements were obtained by direct measurement and using line profile disentangling technique. By combining solutions from codes FOTEL KOREL, we derived improved orbital elements. From RVs Balmer lines also some strong metallic found that all RV variations are phase-locked with period. V...

The Galileo Ground Segment design includes a global network of Galileo Sensor Stations (GSS) to be used for orbit determination, time synchronization, and integrity determination. NovAtel, under contract to ESA, is developing the requirements for the high quality Ground Reference Receivers to be used in the GSS. During the design process NovAtel is leveraging their experience as the world’s lea...

dynamic game theory is applied to analyze the timber market in northern iran as a duopsony. the nash equilibrium and the dynamic properties of the system based on marginal adjustments are determined. when timber is sold, the different mills use mixed strategies to give sealed bids. it is found that the decision probability combination of the different mills follow a special form of attractor an...

Two computer codes to simulate the long term evolution (100 years) of the Earth orbiting debris have been developed under a contract of the Euro-pean Space Agency. In one of them, called Semi Deterministic Model (SDM), the goal was to accurately follow the orbital evolution of the population, so that each large object (and a sample of the small particles) is individually propagated with a semi-...

introduction: the review of medical records with the aim of assessing the quality of codes has long been conducted in different countries. auditing medical coding, as an instructive approach, could help to review the quality of codes objectively using defined attributes, and this in turn would lead to improvement of the quality of codes. method: the current study aimed to present a model for au...

We perform numerical simulations of a disc-planet system using various grid-based and smoothed particle hydrodynamics (SPH) codes. The tests are run for a simple setup where Jupiter and Neptune mass planets on a circular orbit open a gap in a protoplanetary disc during a few hundred orbital periods. We compare the surface density contours, potential vorticity and smoothed radial profiles at sev...