While database schema options in relational database management systems are few and have been studied for decades, little effort has so far been devoted to NoSQL column stores. Today, schema design for column stores i...
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While database schema options in relational database management systems are few and have been studied for decades, little effort has so far been devoted to NoSQL column stores. Today, schema design for column stores is still based on the gut feeling of the application developer instead of being approached systematically. This is even more critical as "good" schemas in column stores do not only depend on the data model of the application but also on the queries on that data: Poor schema design will either lead to a situation where not all queries can be answered or where some queries will show really poor performance. In this paper, we propose a systematic and informed approach to database schema design in NoSQL column stores by means of automated schema generation and application-specific schema ranking.
Calculation of complex curves with high accuracy is challenging. The curve is approximated by segments of straight lines and carried out smoothing. A new method of analytic geometry to calculate the trajectories of me...
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Calculation of complex curves with high accuracy is challenging. The curve is approximated by segments of straight lines and carried out smoothing. A new method of analytic geometry to calculate the trajectories of mechatronic systems and CAD/CAM is offered. The theoretical basis of the method is symmetries in the Euclidean plane. The method can accurately calculate the trajectory for the centrally symmetric conic sections and, in some cases, arbitrary differentiable planar curves. The method gives an accurate analytical solution without using radicals. This allows you to find the formulaic dependencies for further calculations. The existence of Lissajous figures allows assuming the presence of a universal method of calculation of complex trajectories based on planar differentiable curves. Some examples of the design of the kinematic mechanisms are presents additionally.
The paper describes the results of real simulation project in production line. The aim was to optimize the number of workers according to the different orders during one working week, to minimize time for orders reali...
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The goal of this work was to use the process of knowledge discovery in planning and control of production processes. This work is focused on the prediction of the system behavior from the data of production process. T...
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作者:
Maria MisutovaMartin MisutInstitute of Applied Informatics
Automation and Mathematics Faculty of Materials Science and TechnologySlovak University of Technology in Bratislava Hajdoczyho 1 917 24 Trnava Slovakia Department of Applied Informatics
Faculty of Economic Informatics University of Economics in Bratislava Dolnozemska cesta 1/b 852 35 Bratislava Slovakia
This article describes the part of the solution of effective assessment with the support of technology. It is a part of a complex solution containing model of teaching, which includes the assessment with the support o...
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This article describes the part of the solution of effective assessment with the support of technology. It is a part of a complex solution containing model of teaching, which includes the assessment with the support of technology, verification of the model by implementing in selected mathematics courses, adaptation of teaching model based on the results of the experiments, and development of recommendations and application for other subjects of study at the Faculty of Material Science and technology, Slovak University of technology (MTF STU) in Trnava.
Recently, inverse parametric linear/quadratic programming problem was shown to be solvable via convex liftings approach [13]. This technique turns out to be relevant in explicit model predictive control (MPC) design i...
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In the paper, modelling and robust control of temperature fields of the casting mould in the benchmark casting plant is presented. Temperature fields are supposed as distributed parameter systems with dynamic describe...
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In the paper, modelling and robust control of temperature fields of the casting mould in the benchmark casting plant is presented. Temperature fields are supposed as distributed parameter systems with dynamic described by partial differential equations. Based on finite element method modelling, models for control synthesis purpose in the form of lumped-input/distributed-output system are created. For this representation, uncertainty of the controlled system was considered and robust control synthesis with internal model control structure was designed. Robust control of the temperature fields in the casting mould was carried out using the Distributed Parameter Systems Blockset for MATLAB & Simulink.
This paper describes the system activity and the importance of autonomous inertial navigation system /INS/ and its implementation to control the robotic arm. The article further introduces the execution of DC motor re...
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作者:
Viliam MojtoZuzana RausovaJana ChrenovaLadislav DedikIIIrd Clinic of Internal Medicine
Faculty of Medicine Comenius University in Bratislava Limbová 5 833 05 Bratislava Slovakia. Institute of Automation
Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology Namestie slobody 17 812 31 Bratislava Slovakia. Institute of Automation
Measurement and Applied Informatics Faculty of Mechanical Engineering Slovak University of Technology Namestie slobody 17 812 31 Bratislava Slovakia. jana.chrenova@***.
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