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    ADVANCED SCHEDULER FOR COOPERATIVE EXECUTION OF THREADS ON MULTI-CORE SYSTEM by O. N. Karasik, A. A. Prihozhy

    Published 2017-05-01
    Subjects: “…three architectures of the cooperative thread scheduler in a multithreaded application that is executed on a multi-core system are considered. architecture a0 is based on the synchronization and scheduling facilities, which are provided by the operating system. architecture a1 introduces a new synchronization primitive and a single queue of the blocked threads in the scheduler, which reduces the interaction activity between the threads and operating system, and significantly speed up the processes of blocking and unblocking the threads. architecture a2 replaces the single queue of blocked threads with dedicated queues, one for each of the synchronizing primitives, extends the number of internal states of the primitive, reduces the inter- dependence of the scheduling threads, and further significantly speeds up the processes of blocking and unblocking the threads. all scheduler architectures are implemented on windows operating systems and based on the user mode scheduling. important experimental results are obtained for multithreaded applications that implement two blocked parallel algorithms of solving the linear algebraic equation systems by the gaussian elimination. the algorithms differ in the way of the data distribution among threads and by the thread synchronization models. the number of threads varied from 32 to 7936. architecture a1 shows the acceleration of up to 8.65% and the architecture a2 shows the acceleration of up to 11.98% compared to a0 architecture for the blocked parallel algorithms computing the triangular form and performing the back substitution. on the back substitution stage of the algorithms, architecture a1 gives the acceleration of up to 125%, and architecture a2 gives the acceleration of up to 413% compared to architecture a0. the experiments clearly show that the proposed architectures, a1 and a2 outperform a0 depending on the number of thread blocking and unblocking operations, which happen during the execution of multi-threaded applications. the conducted computational experiments demonstrate the improvement of parameters of multithreaded applications on a heterogeneous multi-core system due the proposed advanced versions of the thread scheduler.…”
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  4. 12464

    Dynamic single-photon emission computed tomography as a method of identification of multivessel coronary artery disease by A. V. Mochula, K. V. Zavadovsky, S. L. Andreev, Yu. B. Lishmanov

    Published 2016-11-01
    Subjects: “…objective. the aim of this study was to determine the informative value of dynamic tomoscintigraphy in detection of multivessel coronary artery disease (cad). material and methods. patients with multivessel cad (n= 16) and healthy volunteers (n= 9) underwent dynamic cardiac single photon emission computed tomography with 99mтс-mibi at rest and during pharmacological stress-test. processing of acquired results involved the formation of regions of interest from the cavity and the myocardium of the left ventricle used to create activity-time curves. coronary flow reserve index was defined as a quotient of two ratios of the mean counts from the myocardial region to the integral activity in the left ventricular cavity for the studies performed during pharmacological stress test and at rest. results. the mean values of coronary flow reserve index were 1.86 (1.59…”
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  5. 12465

    APPLICATION OF ASSIGNMENT METHOD WITH SEVIMA EDLINK TO IMPROVE STUDENT'S DISCIPLINE AND MATHEMATICS LEARNING ACHIEVEMENT by Gst Ayu Mahayukti, I Gusti Putu Sudiarta, I Dewa Gede Limarta Yusadi Putra

    Published 2022-09-01
    Subjects: “…Due to the pandemic, teachers need to make breakthroughs in carrying out online learning by utilizing the right online learning media, one of which is the Sevima Edlink application, because Sevima EdLink is an application that can be accessed via a computer or Android, and is free and without installation.This study aims to improve students' achievement and discipline in learning mathematics through the application of the sevima edlink assignment method in online learning on matrix material and matrix transformation. …”
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  6. 12466

    The Choice of a Profession by Blind Senior Students and their Relevance to the Labor Market by Komova N.S., Sokolov V.V.

    Published 2018-04-01
    Subjects: “…Psikhologo-pedagogicheskie osobennosti obucheniya shkol'nikov so zritel'noi deprivatsiei rabote na personal'nom komp'yutere [Psychological and pedagogical features of teaching students with visual deprivation of work on a personal computer]. Psikhologicheskaya nauka i obrazovanie [Psychological science and education]…”
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