Search results for "Systems Science"

Lead-Lag-Shaped Interactive Force Estimation by Equivalent Output Injection of Sliding-Mode

2020

Estimation of interactive forces, which are mostly unavailable for direct measurement on the interface between a system and its environment, is an essential task in various motion control applications. This paper proposes an interactive force estimation method, based on the well-known equivalent output injection of the second-order sliding mode. The equivalent output injection is used to obtain a frequency-unshaped quantity that appears as a matched external disturbance and encompasses the interactive forces. Afterwards, a universal lead-lag shaper, depending on dynamics of the motion control system coupled with its environment, is used to extract an interactive force quantity. Once identif…

COVID-19: A Survey on Public Medical Imaging Data Resources

2020

This regularly updated survey provides an overview of public resources that offer medical images and metadata of COVID-19 cases. The purpose of this survey is to simplify the access to open COVID-19 image data resources for all scientists currently working on the coronavirus crisis.

Dzīves izmaksas indeksa aprēķināšanas metodes revīzija

1940

Fast Decentralized Linear Functions via Successive Graph Shift Operators

2019

Decentralized signal processing performs learning tasks on data distributed over a multi-node network which can be represented by a graph. Implementing linear transformations emerges as a key task in a number of applications of decentralized signal processing. Recently, some decentralized methods have been proposed to accomplish that task by leveraging the notion of graph shift operator, which captures the local structure of the graph. However, existing approaches have some drawbacks such as considering special instances of linear transformations, or reducing the family of transformations by assuming that a shift matrix is given such that a subset of its eigenvectors spans the subspace of i…

Application of multivariant decision tree technique in high performance football: The female and male corner kick.

2019

The use of multidimensional statistical technique based on decision trees is of recent application in sports science. In the case of football, this technique has not yet been sufficiently proven. The aim of the present study was to search for different success models for the cor- ners in the FIFA World Cup 2014 and FIFA Women's World Cup 2015. For this, the statistical analysis focused on the search for classification models for the different criteria considered (shot, shot between the three posts and goal), based on the creation of different decision trees that allow the most important variables to be identified quickly and efficiently. For this, 1117 corners were collected between the two…

Stick-slip and convergence of feedback-controlled systems with Coulomb friction

2020

An analysis of stick-slip behavior and convergence of trajectories in the feedback-controlled motion systems with discontinuous Coulomb friction is provided. A closed-form parameter-dependent stiction region, around an invariant equilibrium set, is proved to be always reachable and globally attractive. It is shown that only asymptotic convergence can be achieved, with at least one but mostly an infinite number of consecutive stick-slip cycles, independent of the initial conditions. Theoretical developments are supported by a number of numerical results with dedicated convergence examples.

Latvia

1924

Latvia

1925

Izglītības pētījumu aptaujas - no izveidošanas līdz datu apstrādei

2020

Aptaujas ir ļoti svarīgs izglītības pētījumu instruments. Bieži vien jauniem pētniekiem ir maldīgs priekšstats, ka to izveidošana ir ātra un vienkārša. Tikai rūpīgi un precīzi izstrādātas aptaujas ir sekmīga pētījuma pamats. Autori cer, ka šī mācību grāmata būs drošs ceļvedis kursa darbu, diplomdarbu, maģistra darbu un promocijas darbu izstrādes laika pētījumos. Grāmata būs noderīga studentiem, maģistrantiem un doktorantiem, kā arī visiem, kas izstrādā un īsteno pētījumus izglītības jomā, datu savākšanai izmantojot aptaujas. Aptauju plānošanas, izstrādāšanas, pārbaudes un lietošanas izklāsts balstīts uz plašu teorētisko bāzi un autoru praktisko pieredzi starptautiskajā izglītības pētniecībā…

Internet of Autonomous Vehicles: Architecture, Features, and Socio-Technological Challenges

2019

Mobility is the backbone of urban life and a vital economic factor in the development of the world. Rapid urbanization and the growth of mega-cities is bringing dramatic changes in the capabilities of vehicles. Innovative solutions like autonomy, electrification, and connectivity are on the horizon. How, then, we can provide ubiquitous connectivity to the legacy and autonomous vehicles? This paper seeks to answer this question by combining recent leaps of innovation in network virtualization with remarkable feats of wireless communications. To do so, this paper proposes a novel paradigm called the Internet of autonomous vehicles (IoAV). We begin painting the picture of IoAV by discussing th…