This paper presents a procedure for integrating physiological signals (and EEG in particular) into gameplay on a mobile device. In HCI (Human-Computer Interaction) research there is a great interest in what the next i...
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This paper presents a procedure for integrating physiological signals (and EEG in particular) into gameplay on a mobile device. In HCI (Human-Computer Interaction) research there is a great interest in what the next innovation in game interaction will be - many are betting on physiological input; others on user-based game adaptation. Thus this paper combines both approaches and addresses user-based adaptation from physiological signals. We have designed a reusable, flexible and generalizable framework for mobile physiological games with the aim for supporting adaptive game development. The research mostly focuses on educational games for children with dyslexia. Our primary purpose is to improve the efficiency of these applications by improving educational learning in children.
Developing the control of modern power converters is a very expensive and time-consuming task. Real-time simulation of the power stage with analog measured signals can reduce significantly the cost and time of develop...
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Developing the control of modern power converters is a very expensive and time-consuming task. Real-time simulation of the power stage with analog measured signals can reduce significantly the cost and time of developing a product. This new approach is known as HIL (Hardware-In-the-Loop) testing. It combines the advantages of other testing methods: low cost like offline computer simulation, complex tests like laboratory testing and realistic conditions like testing on the field. Many calculation algorithms are used for general circuit simulation. The subject of this paper is the evaluation of the most commonly used algorithms from the aspect of HIL simulation of a typical power electronic application: an LCL filter after a three-phase inverter. Beyond the realistic result, simplicity is also an important requirement, which allows shorter time steps in the simulator. The main goal is to determine whether the more complicated or the faster methods give the better simulation result.
Nowadays BitTorrent is a popular peer-to-peer file sharing protocol. Thanks to the advancement and prevalence of smart phones the usage of the protocol is increasing, since mobile devices are capable of joining BitTor...
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Nowadays BitTorrent is a popular peer-to-peer file sharing protocol. Thanks to the advancement and prevalence of smart phones the usage of the protocol is increasing, since mobile devices are capable of joining BitTorrent swarms as well. The key of the protocol is to distribute content between peers therefore it is very important that peers have reliable network connections and provide the correct content. In this paper we analyze the reliability of BitTorrent protocol in mobile environment by observing the availability rate of peers and the poisoning phenomenon in the system. For this research we have collected anonymous statistics retrieved by clients using DrTorrent. DrTorrent is a BitTorrent client that we have implemented on the Android platform. It was published on Google Play Store almost half a year ago and we have collected many experiences since then. In this research we introduce statistics and real measurements about DrTorrent and highlight the key points and relationships. This work can be considered as a pioneer work in the field of modern smart phone peer-to-peer research.
This paper shows a novel control strategy for one phase solar converters to minimize the effect of the one phase power fluctuation. This fluctuation has a serious effect to the efficiency of the system: the PV does no...
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ISBN:
(纸本)9781479900626
This paper shows a novel control strategy for one phase solar converters to minimize the effect of the one phase power fluctuation. This fluctuation has a serious effect to the efficiency of the system: the PV does not operate in the maximum power point (MPP), the harmonic content of the output current is significant that's why compensation of the power fluctuation is needed. In this study a method is shown, which calculates the effects of the power fluctuation to the DC link voltage feedback and compensates with it. This compensation method has a good static- and dynamic behavior: The DC feedback voltage does not have significant fluctuation and can follow the changing in the grid's voltage. The results were simulated in Matlab Simulink and with a one phase solar voltage source inverter experiments were taken. The simulated and the experimental result confirm that this compensation method also has a good static- and dynamic behavior.
In recent years the MapReduce framework has become one of the most popular parallel computing platform for processing big data. It is frequently used by companies such as Facebook, IBM, and Google. Moreover, more and ...
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In recent years the MapReduce framework has become one of the most popular parallel computing platform for processing big data. It is frequently used by companies such as Facebook, IBM, and Google. Moreover, more and more universities adopt this approach for their academic purposes. Since the MapReduce computing framework is designed for distributed computing on massive data sets, with the help of new algorithms, it can be a suitable platform for processing graphs with billions of vertices and edges. The st-connectivity, that is, the existence of at least one path between any two vertices s and t, is a fundamental graph theory problem. This paper introduces a new algorithm, which is capable of finding st-connectivity in arbitrary graphs, designed for the MapReduce framework. The paper also defines the data structure, which might be suitable in case of other graph processing algorithms.
The Dynamic Window Approach (DWA) to collision avoidance is a well-known and elegant method in the mobile robotics field. It provides a collision-free navigation between obstacles, and takes the dynamic properties of ...
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The Dynamic Window Approach (DWA) to collision avoidance is a well-known and elegant method in the mobile robotics field. It provides a collision-free navigation between obstacles, and takes the dynamic properties of the robot into account. Numerous variants had been proposed for this approach, most of them are using an objective function consisting of weighted terms. The solution named Global Dynamic Window Approach with Receding Horizon Control (GDWA/RHC) uses a global navigation function - which is a scalar-valued function representing the distance from the goal point - as the objective function. In this paper, a real-world implementation of the DWA and the GDWA/RHC methods is introduced.
With the developments of the last years, smartphones became suitable to be used as smart cameras in a visual sensor network. They have the necessary cameras with an acceptable quality of lenses and CCD, the required p...
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ISBN:
(纸本)9781479908530
With the developments of the last years, smartphones became suitable to be used as smart cameras in a visual sensor network. They have the necessary cameras with an acceptable quality of lenses and CCD, the required processing power, and WiFi or Bluetooth interfaces for communication. This paper describes the architecture of the SMEyeL (Smart Mobile Eyes for Localization) system. It is designed to utilize both smartphones and PC-s as processing nodes of a visual sensor network. It aims to achieve high spatial and temporal resolution, energy consumption optimization via computation offloading and distributed processing. The SMEyeL project is open source: sourcecode and measurement data sets are available on the web. We present the detailed description of the architecture and exprimental results related to timing accuracy and localization precision.
Orientation estimation and pedestrian tracking in mobiles have been examined by many in the last few years. Using sensors filtering, sensors fusion and even extended Kalman filters, there are still problems with orien...
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Orientation estimation and pedestrian tracking in mobiles have been examined by many in the last few years. Using sensors filtering, sensors fusion and even extended Kalman filters, there are still problems with orientation estimation. Although MEMS based gyroscopes are relatively cheap, many phones still lack these devices, for this an optical flow based solution is presented. In this paper we demonstrate the theory and feasibility of optical flow based virtual gyroscopes on an Android based handset. We examined two methods of feature detection, measured tracking results and constructed fusion of results with regular inertial sensor values. This way, we have not only substituted real gyroscope to a virtual one, but created a fused gyroscope sensor as well. Tests were recorded using a robotic arm to provide reliable results.
XML is a frequently applied data representation format to support the communication between software systems even if they are on different platforms. The process of transforming an in-memory object instance into bytes...
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ISBN:
(纸本)9781479908530
XML is a frequently applied data representation format to support the communication between software systems even if they are on different platforms. The process of transforming an in-memory object instance into bytes of an XML document is called XML serialization, the opposite direction is XML deserialization. Both processes introduce some cost that influences the overhead of the communication. This paper proposes a performance model that can estimate the cost of XML serialization and deserialization on Java platform based on a priori knowledge of the type and size of the XML messages. Type and size information of the XML messages is usually available in the form of an interface definition, such as a Web Services Description Language (WSDL) file. We show that in most cases the cost can be expressed as a linear function of the object size, but exceptions are discussed as well. The suggested model is validated with measurements.
Embedded systems are often modeled using Matlab Simulink to simulate their behavior. These systems contain several different models. During the execution of these systems, the Simulink must provide some transformation...
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ISBN:
(纸本)9781479900626
Embedded systems are often modeled using Matlab Simulink to simulate their behavior. These systems contain several different models. During the execution of these systems, the Simulink must provide some transformations for its models. One of the most common transformations is the flattening of the virtual subsystems within these models. If we execute the model processing via model transformations, then the abstraction level of the processing also increases. This paper presents a transformation that facilitates the flattening of virtual subsystems in Simulink models. The transformation is implemented through the application of graph transformation methods.
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