1. Intra-minute cloud passing forecasting based on a low cost iot sensor - a solution for smoothing the output power of PV power plantsPrimož Sukič, Gorazd Štumberger, 2017, izvirni znanstveni članek Opis: Clouds moving at a high speed in front of the Sun can cause step changes in the output power of photovoltaic (PV) power plants, which can lead to voltage fluctuations and stability problems in the connected electricity networks. These effects can be reduced effectively by proper short-term cloud passing forecasting and suitable PV power plant output power control. This paper proposes a low-cost Internet of Things (IoT)-based solution for intra-minute cloud passing forecasting. The hardware consists of a Raspberry PI Model B 3 with a WiFi connection and an OmniVision OV5647 sensor with a mounted wide-angle lens, a circular polarizing (CPL) filter and a natural density (ND) filter. The completely new algorithm for cloud passing forecasting uses the green and blue colors in the photo to determine the position of the Sun, to recognize the clouds, and to predict their movement. The image processing is performed in several stages, considering selectively only a small part of the photo relevant to the movement of the clouds in the vicinity of the Sun in the next minute. The proposed algorithm is compact, fast and suitable for implementation on low cost processors with low computation power. The speed of the cloud parts closest to the Sun is used to predict when the clouds will cover the Sun. WiFi communication is used to transmit this data to the PV power plant control system in order to decrease the output power slowly and smoothly.
Ključne besede: photovoltaic power plant, cloud passing forecasting, algorithm, sensor, Raspberry Pi, camera, wide-angle lens, optical filters, internet of things
Objavljeno: 20.07.2017; Ogledov: 23; Prenosov: 0
 Polno besedilo (8,15 MB) |
2. Web based education tool for neural network robot controlJure Čas, Darko Hercog, Riko Šafarič, izvirni znanstveni članek Opis: This paper describes the application for teleoperations of the SCARA robot via the internet. The SCARA robot is used by students of mehatronics at the University of Maribor as a remote educational tool. The developed software consists of two parts i.e. the continuous neural network sliding mode controller (CNNSMC) and the graphical user interface (GUI). Application is based on two well-known commercially available software packages i.e. MATLAB/Simulink and LabVIEW. Matlab/Simulink and the DSP2 Library for Simulink are used for control algorithm development, simulation and executable code generation. While this code is executing on the DSP-2 Roby controller and through the analog and digital I/O lines drives the real process, LabVIEW virtual instrument (VI), running on the PC, is used as a user front end. LabVIEW VI provides the ability for on-line parameter tuning, signal monitoring, on-line analysis and via Remote Panels technology also teleoperation. The main advantage of a CNNSMC is the exploitation of its self-learning capability. When friction or an unexpected impediment occurs for example, the user of a remote application has no information about any changed robot dynamic and thus is unable to dispatch it manually. This is not a control problem anymore because, when a CNNSMC is used, any approximation of changed robot dynamic is estimated independently of the remote's user.
Ključne besede: LabVIEW, Matlab/Simulink, neural network control, remote educational tool
Objavljeno: 19.07.2017; Ogledov: 18; Prenosov: 0
Polno besedilo (792,88 KB) |
3. Interface between macro and nano worldsGregor Škorc, Riko Šafarič, David Lukman, Sirhiy Ivanovich Protsenko, Simon Zapusek, 2010, izvirni znanstveni članek Opis: This paper describes the design of a nanorobotic application which includes: nanorobotic arm, Akiyama sensor system, a vacuum chamber, and an interface tools for the nanorobotic hardware developed using C++ and VRML languages in order to create a desktop virtual-reality environment which improves visualisation and prevents collision of the nanomanipulator hardware with the associated workspace. The presented experiment shows how the used man-machine interface could be used for communication between macro and micro/nano worlds.
Ključne besede: nanorobotics, virtual-reality, sensors system
Objavljeno: 19.07.2017; Ogledov: 20; Prenosov: 0
Polno besedilo (1,70 MB) |
4. Control and robotics remote laboratory for engineering educationRiko Šafarič, Mitja Truntič, Darko Hercog, Gregor Pačnik, 2005, izvirni znanstveni članek Opis: The new tools for education of engineering emerged and one of the most promising is a remote rapid control prototyping (RRCP), which is very useful also for control and robotics development in industry and in education. Examples of introductory remote control and simple robotic. courses with integrated hand, on experiments are presented in the paper. The aim o/: integration of remote hand on experiments into control and/or robotics course is to minimize the gap between the theory and practice to teach students the use of RRCP and to decrease the education costs. Developed RRCP experiments are based on MATLAB/Simulink, xPC target, custom developed embedded target for DSP-2 controller and LabVIEW virtual instrument.
Ključne besede: education of control and robotics, rapid prototyping, remote engineering
Objavljeno: 19.07.2017; Ogledov: 19; Prenosov: 0
Polno besedilo (1,80 MB) |
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7. Growth dynamics and reproductive activity of annual shoots in the walnut cultivar 'Elit'Anita Solar, Mitja Solar, Franci Štampar, 2005, izvirni znanstveni članek Opis: An architectural analysis of a fruiting branch in the Slovenian variety 'Elit' was conducted during three successive years. The fruit bearing branch was constructed of a three-year-old parent shoot plus all corresponding two-year-old shoots and annual shoots (1Y). The construction of the bearing branch during the time caused a statistically significant increase in the number of annual shoots. The basal diameter and the length of 1Y significantly depended on a year whereas their angles did not. In spite of decreasing length of 1Y, the number of vegetative buds per shoot increased from the first to the third year of observations. The number of nodes was closely correlated with the length of the shoots. Activity points on the 1Y were most often on the apical two or three nodes, what was expressed by a marked acrotony. The number of active points varied as the tree matured. The ratio fruit bearing 1Y ž total 1Y was 0.47 in year 1; 0.18 in year 2; 0.74 in year 3. It points to the slightly alternance. As the tree grew the number of flowering buds per 1Y as well as the number of female flowers per 1Y increased. The results of the three-year-long research show some growth and development rules in the walnut cultivar 'Elit', however, they do not allow a reliable prediction of the following activities. We assume that this will be possible after another three-year-long analysis, with the help of the Hidden Mark Model.
Ključne besede: Juglans regia L., tree architecture, fruiting branch, vegetative growth, bearing potentials, shoots, statistical modelling, Hidden Mark Model
Objavljeno: 13.07.2017; Ogledov: 30; Prenosov: 1
Polno besedilo (284,30 KB) |
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9. Model za izbiro komunikacijskih protokolov pri razvoju rešitev za internet stvariDenis Pocak, 2017, magistrsko delo/naloga Opis: Izzivi interneta stvari so najpogostejši razlog za neučinkovito delovanje rešitev. Za izvedbo teh so pomembni komunikacijski protokoli, ki delujejo na aplikacijskem nivoju. V magistrskem delu smo raziskali potencialne komunikacijske protokole (AMQP, CoAP, MQTT in XMPP). Uporabili smo metodo sistematičnega pregleda literature ter zbrali splošne podatke, kakor tudi podatke o izzivih (interoperabilnost, odkrivanje, povezovanje, poraba energije in varnost) interneta stvari. Na podlagi teh smo oblikovali ocenitveni model, v katerem smo komunikacijske protokole ocenili in podprli izbiro primernega glede na zahteve rešitve. Ugotovili smo, da se je za natančnejšo izbiro potrebno osredotočiti samo na tiste lastnosti komunikacijskih protokolov, ki jih rešitev zahteva.
Ključne besede: internet stvari, komunikacijski protokoli, aplikacijski nivo
Objavljeno: 13.07.2017; Ogledov: 26; Prenosov: 4
Polno besedilo (3,06 MB) |
10. Razvoj merilnega programa za zajemanje parametrov pralnega strojaAljaž Prelovšek, 2017, diplomsko delo/naloga Opis: Tema diplomske naloge je razvoj in implementacija aplikacije za zajemanje parametrov pralnega stroja v proces testiranja stabilnosti pralnih strojev. Predstavljena je zgradba pralnega stroja ter razložena problematika nestabilnega delovanja pralnega stroja zaradi pojava prekomerne ekscentrične mase v bobnu pralnega stroja. Opisan je postopek izdelave ožičenja laboratorija za prenos podatkov in prikazan pravilen priklop računalnika na krmilno enoto pralnega stroja za vzpostavitev serijske povezave. Aplikacija za zajem parametrov je izdelana v programskem okolju LabVIEW, njena zgradba in delovanje pa sta tudi podrobneje predstavljena.
Ključne besede: pralni stroj, stabilnost pralnega stroja, LabVIEW, merilni program, zajemanje parametrov
Objavljeno: 13.07.2017; Ogledov: 153; Prenosov: 22
Polno besedilo (2,22 MB) |
