1,720,964 research outputs found
Software complex for measuring operating systems’ main functions performance
No full textThis paper describes the software package created by the author for measuring the performance of operating system functions. This work aims to synthesize a software package designed to analyse the execution time of software functions of uniprocessor and multiprocessor operating systems. The package analyses a number of functions of operating systems: mutexes, semaphores, read-write locks, FIFO and PIPE channels, TCP and UDP sockets, context switching, system calls. Unlike analogues, this package is represented by a convenient graphical user interface; the Qt and Qwt libraries are used for its implementation, they have a rich set of widgets, i.e. programs that facilitate access to information. The libraries used are cross-platform, which allows us to make a simpler procedure for transferring applications to different operating systems; smoothing the test results curves is used. In conclusion, the results of test measurements are presented
TASK MANAGER FOR GENERAL-PURPOSE OPERATING SYSTEMS
Full text linkThis paper suggests a possible task manager implementation for generalpurpose operating systems. The aim of the study is to maximize processor utilization in exclusive mode for general-purpose operating systems. The subject research field of this study is relevant today in the light of global informatization and the urgent issue of improving computing performance. In order to achieve the objectives, set in this study, several particular problems have been solved, which include analysing various scheduling strategies for computational task execution, comparing specifics of various operating systems, choosing a system resource allocating method, developing a software for running calculations in priority mode, and minimizing scheduling and dispatching overheads. During the study, we have analysed four families of general-purpose operating systems and their features. A summary information on the utilized scheduling and dispatching algorithms has been prepared based on the analysis results, which allowed choosing the appropriate approach to solve the problem under consideration. A resource allocation method has been chosen and implemented as software unit, based on mechanisms common to the considered systems that developed software starts computations under a configuration corresponding to the system's topology, sets a realtime scheduling policy for threads, assigns them to available computational cores, and independently dispatches task execution. The effectiveness of the developed software is confirmed by test runs and measurement of such indicators as runtime, number of context switches and accesses to external memory. The main results obtained can be applied when designing new and improving the existing general-purpose operating systems
Mathematical models for evaluating efficiency and quality of means for synchronization of interacting processes in reconfigurable computer systems
No full textIn this paper, the modelling method is applied to evaluate the performance characteristics of various methods for synchronization of parallel processes in order to determine which way to use to implement them: software or hardware. Comparative characteristics of process synchronization by the spin lock method and the core lock method are presented. Charts have been constructed that display the obtained characteristics
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Variations on the Author
Full text link“Variations on the Author” discusses two of Eduardo Coutinho’s recent films (Um Dia na Vida, from 2010, and Últimas Conversas, posthumously released in 2015) and their contribution to the general question of documentary authorship. The director’s filmography is characterized by a consistent yet self-effacing form of authorial self-inscription: Coutinho often features as an interviewer that rather than express opinions propels discourses; an interviewer that is good at listening. This mode of self-inscription characterizes him as an author who is not expressive but who is nonetheless markedly present on the screen. In Um Dia na Vida, however, Coutinho is completely absent form the image, while Últimas Conversas, on the contrary, includes a confessional prologue that moves the director from the margins to the center of his films. This article examines the ways in which these works stand out in the filmography of a director who offers new insights into the notion of cinematic authorship
Appropriate Similarity Measures for Author Cocitation Analysis
Full text linkWe provide a number of new insights into the methodological discussion about author cocitation analysis. We first argue that the use of the Pearson correlation for measuring the similarity between authors’ cocitation profiles is not very satisfactory. We then discuss what kind of similarity measures may be used as an alternative to the Pearson correlation. We consider three similarity measures in particular. One is the well-known cosine. The other two similarity measures have not been used before in the bibliometric literature. Finally, we show by means of an example that our findings have a high practical relevance.information science;Pearson correlation;cosine;similarity measure;author cocitation analysis
Dispelling the Myths Behind First-author Citation Counts
Full text linkWe conducted a full-scale evaluative citation analysis study of scholars in the XML research field to explore just how different from each other author rankings resulting from different citation counting methods actually are, and to demonstrate the capability of emerging data and tools on the Web in supporting more realistic citation counting methods. Our results contest some common arguments for the continued
use of first-author citation counts in the evaluation of scholars, such as high correlations between author rankings by first-author citation counts and other citation
counting methods, and high costs of using more realistic citation counting methods that are not well-supported by the ISI databases. It is argued that increasingly available digital full text research papers make it possible for citation analysis studies to go beyond what the ISI databases have directly supported and to employ more
sophisticated methods
koamabayili/VECTRON-author-checklist: VECTRON author checklist
No full textWe have done our best to complete the author checklist relating to the use of animals in the hut study. Note that the objective for the hut study was to evaluate the IRS treatment applications for residual efficacy against Anopheles mosquitoes, including the local An. coluzzii mosquito population. Cows were only used to attract mosquitoes into the huts and no tests were carried out directly on the cows. The author checklist is intended for use with studies where experiments are carried out on animals, which is why we have had such difficulty in completing this for the hut study, as many of the questions do not relate to how the cows were used
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