Two Rank Order Tests for \u3cem\u3eM\u3c/em\u3e-ary Detection

We consider a general M-ary detection problem where, given M groups of L samples each, the problem is to identify which unique group of L samples have come from the signal hypothesis. The optimal likelihood ratio test is unrealizable, when the joint distribution of ML samples is not completely known. In this paper we consider two rank order types of tests termed as the modified rank test (MRT) and the modified rank test with row sort (MRTRS). We examine through simulation, the small sample probability of error performances of MRT and MRTRS for detecting a signal among contaminants. Numerically computable closed –form error expressions are derived for some special cases. Asymptotic (large sample) error rate of MRT is also derived. The results indicate that MRTRS provides improved performance over other previously known rank tests

On an unstable manifold and approximation attractor of a semidynamical system on a parallel computer under a T-system

Contains fulltext : 18951_on__anunm.pdf ( ) (Open Access)14 p

Variable Reassignment in the T++ Parallel Programming Language

Abstract. The paper describes the OpenTS parallel programming system that provides the runtime environment for T++ language. T++ is an extension for C++ that adds a set of keywords to C++, allowing smooth transition from sequential to parallel applications. In this context the support of repeated assignments to a variable is an important feature. The paper focused on semantics and implementation of such variables in T++. Applications written in T++ can be run on computational clusters, SMPs and GRIDs, either in Linux or Windows OS. Key words: OpenTS, T++, parallel computing, variable reassignmen

Analysis of directions for improvement of flight simulators

The modern development of science and technology makes it possible to modernize imitators for an aviation simulator and increase the number of training situations. This allows you to improve the professional skills of pilots. The development of most imitators is the development of programs for a specialized computer. Modern integrated aviation simulators are designed to teach pilots how to fly an aircraft in special flight situations, or training situations. The increase in training situations is the main task facing the developers of aviation simulators. Improvement of imitators allows to increase the number of training situations. This is possible if the imitators are upgraded to take into account the new capabilities of available software and new hardware. The existing integrated aviation simulators are designed to train pilots in the process of controlling an aircraft. It is impossible to create a complete model of any aircraft unit. Therefore, imitators for flight simulators were developed for training pilots only in special flight conditions. Therefore, the task of developing a imitator is the use of available software and available hardware to develop information processes that inform the pilot as much as possible when solving problems of controlling the aircraft model. Studies have shown that it is expedient to develop imitators taking into account the formation of individual components of the pilot's cognitive model, in which his experience in solving problems of aircraft control and experience in solving navigation problems is deposited. The article considers the main directions for improving imitators for flight simulators, taking into account their impact on the given components of the pilot's cognitive model

Modernisation of Endoscopic Equipment Using 3D Indicators

The development of new software to improve the operation of modernised and developed technological facilities in different sectors of the national economy requires a systematic approach. For example, the use of video recording systems obtained during operations with the use of endoscopic equipment allows monitoring the work of doctors. Minor change of the used software allows using additionally processed video fragments for creation of training complexes. The authors of the present article took part in the development of many educational software and hardware systems. The first such system was the “Contact” system, developed in the eighties of the last century at Riga Polytechnic Institute. Later on, car simulators, air plan simulators, walking excavator simulators and the optical software-hardware training system “Three-Dimensional Medical Atlas” were developed. Analysis of various simulators and training systems showed that the computers used in them could not by themselves be a learning system. When creating a learning system, many factors must be considered so that the student does not receive false skills. The goal of the study is to analyse the training systems created for the professional training of medical personnel working with endoscopic equipment, in particular, with equipment equipped with 3D indicators