Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129015
Yamin Li, Dianhong Wang, Weimin Zhang
Determined by the generating mechanism of AE event, AE signal has significant energy characteristics which can be used for identification. In this paper, a real-time embedded crack identification system of brittle material is designed and implemented. The system is fully functional that integrates AE signal acquisition, de-noising, signal extraction, characteristic recognition and alarm. In addition, an Energy-ratio based signal processing method is developed on the basis of statistical analysis of numerous brittle material crack data. Both the proposed system and method are verified on a test-bed deployed in a factory workshop. Experiment results show that the method has a satisfying identification accuracy and real-time performance in the noisy environment.
{"title":"Real-time identification of brittle material crack under high pressure based on AE signal analysis","authors":"Yamin Li, Dianhong Wang, Weimin Zhang","doi":"10.1109/RADIOELEK.2015.7129015","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129015","url":null,"abstract":"Determined by the generating mechanism of AE event, AE signal has significant energy characteristics which can be used for identification. In this paper, a real-time embedded crack identification system of brittle material is designed and implemented. The system is fully functional that integrates AE signal acquisition, de-noising, signal extraction, characteristic recognition and alarm. In addition, an Energy-ratio based signal processing method is developed on the basis of statistical analysis of numerous brittle material crack data. Both the proposed system and method are verified on a test-bed deployed in a factory workshop. Experiment results show that the method has a satisfying identification accuracy and real-time performance in the noisy environment.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130673863","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129064
J. Veselý, S. Doan
A hyperbola is defined by difference of distances to foci, in which its absolute value is a constant. Solutions of a system of hyperbolic equations (SoHE) can represent for intersection points of two hyperbolas given by four individual points in xy-plane. In this study, analytical method solving SoHE is aimed to find intersection points of two hyperbolas in the general in xy-plane. The demonstrated method is based on two algorithms for two cases, in which the two hyperbolas are/are not perpendicular to each other. According to analytical algorithms solving quadratic and quartic equation in general, the results of analytical method solving SoHE are shown like explicit solutions. These results are requisite for further development in finding intersection points of two hyperbolas in 3-D space in general and finally used in estimating target position using TDOA.
{"title":"Analytical method solving system of hyperbolic equations","authors":"J. Veselý, S. Doan","doi":"10.1109/RADIOELEK.2015.7129064","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129064","url":null,"abstract":"A hyperbola is defined by difference of distances to foci, in which its absolute value is a constant. Solutions of a system of hyperbolic equations (SoHE) can represent for intersection points of two hyperbolas given by four individual points in xy-plane. In this study, analytical method solving SoHE is aimed to find intersection points of two hyperbolas in the general in xy-plane. The demonstrated method is based on two algorithms for two cases, in which the two hyperbolas are/are not perpendicular to each other. According to analytical algorithms solving quadratic and quartic equation in general, the results of analytical method solving SoHE are shown like explicit solutions. These results are requisite for further development in finding intersection points of two hyperbolas in 3-D space in general and finally used in estimating target position using TDOA.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132398672","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129071
O. Fiser
The Institute of Atmospheric Physics Prague of the Czech Academy of Sciences operates an experimental dual-wavelength free space optical (FSO) link at the meteorological observatory Milesovka being 70 km north to Prague (837 m.a.s.l.). Relevant meteorological quantities attenuating the signal (meteorological visibility, rain rate, air temperature, air humidity and wind velocity vector) are also measured and sampled. In this paper there is the statistical behavior of atmospheric attenuation described. Some event analysis is added. Particular physical influences of fog, rain, atmospheric turbulences and sonic temperature on FSO attenuation are discussed.
{"title":"Impact of atmosphere on attenuation of free space optical links - Long term results from Milesovka observatory","authors":"O. Fiser","doi":"10.1109/RADIOELEK.2015.7129071","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129071","url":null,"abstract":"The Institute of Atmospheric Physics Prague of the Czech Academy of Sciences operates an experimental dual-wavelength free space optical (FSO) link at the meteorological observatory Milesovka being 70 km north to Prague (837 m.a.s.l.). Relevant meteorological quantities attenuating the signal (meteorological visibility, rain rate, air temperature, air humidity and wind velocity vector) are also measured and sampled. In this paper there is the statistical behavior of atmospheric attenuation described. Some event analysis is added. Particular physical influences of fog, rain, atmospheric turbulences and sonic temperature on FSO attenuation are discussed.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132284796","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129041
Ondrej Zach, M. Slanina
Video content represents majority of the data available on the Internet. Streaming services like YouTube, Vimeo, NetFlix and others generate more than 60% of the overall Internet traffic, according to recent studies. This results in high demands on the quality of the broadband connection. The user usually wants to get the highest media quality, no matter the quality of the connection. This is where the HTTP Adaptive Streaming (HAS) comes into the game. This service enables to maintain the highest media quality possible to offer the user the best quality of experience (QoE). In this paper, we focus on the evaluation of streaming Ultra HD video content using HAS. We evaluate the difference of the QoE for HD and Ultra HD streaming with High Efficiency Video Coding. For this purpose, we created a database of HEVC coded videos of different contents. These were then used in five different HAS scenarios (sudden quality change at the end, sudden quality change in the middle of the sequence, moderate quality changes, gradual quality drop-down and constant high quality for benchmark). HAS sequences were then used in assessed subjective quality test. According to the results, the Ultra HD outperforms the high definition in the terms of perceived subjective quality when used in HAS.
{"title":"A comparison of HAS behavior in the high definition and ultra high definition context","authors":"Ondrej Zach, M. Slanina","doi":"10.1109/RADIOELEK.2015.7129041","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129041","url":null,"abstract":"Video content represents majority of the data available on the Internet. Streaming services like YouTube, Vimeo, NetFlix and others generate more than 60% of the overall Internet traffic, according to recent studies. This results in high demands on the quality of the broadband connection. The user usually wants to get the highest media quality, no matter the quality of the connection. This is where the HTTP Adaptive Streaming (HAS) comes into the game. This service enables to maintain the highest media quality possible to offer the user the best quality of experience (QoE). In this paper, we focus on the evaluation of streaming Ultra HD video content using HAS. We evaluate the difference of the QoE for HD and Ultra HD streaming with High Efficiency Video Coding. For this purpose, we created a database of HEVC coded videos of different contents. These were then used in five different HAS scenarios (sudden quality change at the end, sudden quality change in the middle of the sequence, moderate quality changes, gradual quality drop-down and constant high quality for benchmark). HAS sequences were then used in assessed subjective quality test. According to the results, the Ultra HD outperforms the high definition in the terms of perceived subjective quality when used in HAS.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131886955","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129018
R. Kadikis
A feature-based image registration method is presented for the use on the multispectral skin images. The proposed method allows the use and combination of different kinds of feature points, so it can be adjusted to different applications. The local minima and maxima are used as features for the skin images. By analyzing all possible shifts among feature points in the reference and sensed images, the proposed method efficiently finds translation among these images. The method is expanded to also determine rotation and scale. The proposed method is compared with other area-based and feature-based methods (proposed in the literature specifically for skin images) by testing those methods on a set of multispectral skin images.
{"title":"Registration method for multispectral skin images","authors":"R. Kadikis","doi":"10.1109/RADIOELEK.2015.7129018","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129018","url":null,"abstract":"A feature-based image registration method is presented for the use on the multispectral skin images. The proposed method allows the use and combination of different kinds of feature points, so it can be adjusted to different applications. The local minima and maxima are used as features for the skin images. By analyzing all possible shifts among feature points in the reference and sensed images, the proposed method efficiently finds translation among these images. The method is expanded to also determine rotation and scale. The proposed method is compared with other area-based and feature-based methods (proposed in the literature specifically for skin images) by testing those methods on a set of multispectral skin images.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"267 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133790605","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129061
S. Dash, Vivek Bangera, S. Patkar, G. Trivedi
Due to extremely large size of power grid networks, the realistic simulation of VLSI power distribution network (power grid analysis) is computationally intensive both in terms of runtime and memory. The ongoing trends in technology scaling imply to design fast and power efficient circuits. With smaller feature sizes and variability in silicon, it has become a challenging task to design and analyze a reliable power distribution network inside a chip for correct logical functioning of an electronic circuit. In order to analyze a power grid network accurately and efficiently, a suitable computing environment and a correct technique need to be adopted. This work presents a parallel technique based on random walk algorithm using parallel computing environments like Intel Xeon Phi and Graphics Processing Unit. The proposed method has shown speedup of 55 and 67 folds as compared to its sequential version while analyzing a power grid network having 25 million nodes on Intel Xeon Phi co-processor and Graphics Processing Unit (GPU) respectively.
{"title":"Power grid analysis on parallel computing platforms","authors":"S. Dash, Vivek Bangera, S. Patkar, G. Trivedi","doi":"10.1109/RADIOELEK.2015.7129061","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129061","url":null,"abstract":"Due to extremely large size of power grid networks, the realistic simulation of VLSI power distribution network (power grid analysis) is computationally intensive both in terms of runtime and memory. The ongoing trends in technology scaling imply to design fast and power efficient circuits. With smaller feature sizes and variability in silicon, it has become a challenging task to design and analyze a reliable power distribution network inside a chip for correct logical functioning of an electronic circuit. In order to analyze a power grid network accurately and efficiently, a suitable computing environment and a correct technique need to be adopted. This work presents a parallel technique based on random walk algorithm using parallel computing environments like Intel Xeon Phi and Graphics Processing Unit. The proposed method has shown speedup of 55 and 67 folds as compared to its sequential version while analyzing a power grid network having 25 million nodes on Intel Xeon Phi co-processor and Graphics Processing Unit (GPU) respectively.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115648954","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129007
D. Zlacký, J. Staš, J. Juhár, A. Cizmár
In this paper we compare several advanced language modeling techniques for the Slovak continuous speech recognition. Five different language modeling techniques were analyzed, considering their model size and perplexity, speech recognition performance and complexity of their usage in real conditions of speech recognition in Slovak. The preliminary experimental results show that the convenient n-gram models smoothed by the Witten-Bell back-off algorithm produce the best performance according to the model perplexity and recognition accuracy. Other modeling techniques including Maximum Entropy, Power Law Discounting, Hierarchical Pitman-Yor process, or Variable-order Kneser-Ney smoothed models achieved better results only in the model perplexity. However, the increased computational requirements and worse recognition performance limit their usage in the real speech recognition tasks in Slovak.
{"title":"Evaluation of advanced language modeling techniques for the Slovak LVCSR","authors":"D. Zlacký, J. Staš, J. Juhár, A. Cizmár","doi":"10.1109/RADIOELEK.2015.7129007","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129007","url":null,"abstract":"In this paper we compare several advanced language modeling techniques for the Slovak continuous speech recognition. Five different language modeling techniques were analyzed, considering their model size and perplexity, speech recognition performance and complexity of their usage in real conditions of speech recognition in Slovak. The preliminary experimental results show that the convenient n-gram models smoothed by the Witten-Bell back-off algorithm produce the best performance according to the model perplexity and recognition accuracy. Other modeling techniques including Maximum Entropy, Power Law Discounting, Hierarchical Pitman-Yor process, or Variable-order Kneser-Ney smoothed models achieved better results only in the model perplexity. However, the increased computational requirements and worse recognition performance limit their usage in the real speech recognition tasks in Slovak.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127648929","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128991
R. Sotner, J. Petrzela, J. Jerabek, K. Vrba, T. Dostál
This contribution deals with special second-order (biquadratic) single-input and single-output filtering structures employing operational transconductance amplifiers (OTAs) for various electronic variation of parameters that leads to reconnection-less transfer response and is tunable. Structures allows change of transfer type between several types of responses (all or some of them) particularly high-pass, all-pass, band-reject, band-pass and low-pass and high-pass response with intended zero in transfer function. PSpice simulations with models of commercially available real devices support theoretical presumptions.
{"title":"Solutions of reconnection-less OTA-based biquads with electronical transfer response reconfiguration","authors":"R. Sotner, J. Petrzela, J. Jerabek, K. Vrba, T. Dostál","doi":"10.1109/RADIOELEK.2015.7128991","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128991","url":null,"abstract":"This contribution deals with special second-order (biquadratic) single-input and single-output filtering structures employing operational transconductance amplifiers (OTAs) for various electronic variation of parameters that leads to reconnection-less transfer response and is tunable. Structures allows change of transfer type between several types of responses (all or some of them) particularly high-pass, all-pass, band-reject, band-pass and low-pass and high-pass response with intended zero in transfer function. PSpice simulations with models of commercially available real devices support theoretical presumptions.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"80 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124433297","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7129044
J. Rufino, A. Pereira, J. Pidanic
Parallel Stretched Simulated Annealing (PSSA) solves unconstrained multilocal programming optimization problems in distributed memory clusters, by applying the Stretched Simulated Annealing optimization method, in parallel, to multiple sub-domains of the original feasible region. This work presents coPSSA (constrained Parallel Stretched Simulated Annealing), an hybrid application that combines shared memory based parallelism with PSSA, in order to efficiently solve constrained multilocal programming problems. We devise and evaluate two different parallel strategies for the search of solutions to these problems. Evaluation results from a small set of test problems often reach superlinear speedup in the solution search time, thus proving the merit of the coPSSA parallelization approach.
{"title":"coPSSA - Constrained Parallel Stretched Simulated Annealing","authors":"J. Rufino, A. Pereira, J. Pidanic","doi":"10.1109/RADIOELEK.2015.7129044","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7129044","url":null,"abstract":"Parallel Stretched Simulated Annealing (PSSA) solves unconstrained multilocal programming optimization problems in distributed memory clusters, by applying the Stretched Simulated Annealing optimization method, in parallel, to multiple sub-domains of the original feasible region. This work presents coPSSA (constrained Parallel Stretched Simulated Annealing), an hybrid application that combines shared memory based parallelism with PSSA, in order to efficiently solve constrained multilocal programming problems. We devise and evaluate two different parallel strategies for the search of solutions to these problems. Evaluation results from a small set of test problems often reach superlinear speedup in the solution search time, thus proving the merit of the coPSSA parallelization approach.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124787341","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2015-04-21DOI: 10.1109/RADIOELEK.2015.7128997
J. Púc̆ik, T. Lukáč, O. Ondrácek
Transfer function of a linear continuous-time system with lumped parameters is a rational function. Transfer function of real systems, however, cannot always be written in the rational function form. It is the case for the systems with distributed parameters, transfer functions for modeling physical properties of materials, and systems for a colored noise generation such as the noise with power spectral density (PSD) falling off at 10 dB per decade of frequency. A time domain simulation of mentioned systems demands an approximation with a finite order system. In this paper, we consider the types of systems, the transfer functions of which are expressed with a square root. An expansion of the transfer function to the continued fraction, a system structure, and state space equations are derived. The stability of the system is shown and an example of the simulation is presented.
{"title":"Continued fraction expansion of irrational transfer functions for simulation of physical systems","authors":"J. Púc̆ik, T. Lukáč, O. Ondrácek","doi":"10.1109/RADIOELEK.2015.7128997","DOIUrl":"https://doi.org/10.1109/RADIOELEK.2015.7128997","url":null,"abstract":"Transfer function of a linear continuous-time system with lumped parameters is a rational function. Transfer function of real systems, however, cannot always be written in the rational function form. It is the case for the systems with distributed parameters, transfer functions for modeling physical properties of materials, and systems for a colored noise generation such as the noise with power spectral density (PSD) falling off at 10 dB per decade of frequency. A time domain simulation of mentioned systems demands an approximation with a finite order system. In this paper, we consider the types of systems, the transfer functions of which are expressed with a square root. An expansion of the transfer function to the continued fraction, a system structure, and state space equations are derived. The stability of the system is shown and an example of the simulation is presented.","PeriodicalId":193275,"journal":{"name":"2015 25th International Conference Radioelektronika (RADIOELEKTRONIKA)","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-04-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127900795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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