Pub Date : 2017-10-01DOI: 10.1109/TELSKS.2017.8246278
Giannis Kazdaridis, Polychronis Symeonidis, Ioannis Zographopoulos, T. Korakis, K. Klun, N. Kovač
In this paper we present a novel architecture for enabling on-line communication with marine environment monitoring deployments. We rely on a set of communication technologies that range from IoT related low data rate communication standards to the widely adopted Wi-Fi and LTE protocols that are able to support bandwidth demanding applications. To achieve energy-efficient results we turn off all the power-hungry interfaces and peripherals, while maintaining a low-power interface active, dedicated to control the rest of the components. Finally, we present the installation of the developed system in the Vida oceanographic buoy, in Slovenia and evaluate our device in terms of power consumption.
{"title":"On the development of energy-efficient communications for marine monitoring deployments","authors":"Giannis Kazdaridis, Polychronis Symeonidis, Ioannis Zographopoulos, T. Korakis, K. Klun, N. Kovač","doi":"10.1109/TELSKS.2017.8246278","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246278","url":null,"abstract":"In this paper we present a novel architecture for enabling on-line communication with marine environment monitoring deployments. We rely on a set of communication technologies that range from IoT related low data rate communication standards to the widely adopted Wi-Fi and LTE protocols that are able to support bandwidth demanding applications. To achieve energy-efficient results we turn off all the power-hungry interfaces and peripherals, while maintaining a low-power interface active, dedicated to control the rest of the components. Finally, we present the installation of the developed system in the Vida oceanographic buoy, in Slovenia and evaluate our device in terms of power consumption.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"100 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122426893","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246270
V. Stoynov, Z. Valkova-Jarvis
Intelligent radio resource distribution techniques play an important role in improving the overall performance of next-generation networks. An efficient scheduling algorithm can help to achieve higher data rates, lower latency and increased fairness for users. This paper evaluates the performance of an indoor network, simulated using the Realistic Indoor Environment Generator (RIEG), when 11 different Throughput Averaging Methods (TAMs) for the Proportional Fair (PF) algorithm are used. The TAMs are compared by using a Comparative Factor (CF) that simultaneously takes into account the average throughput of the indoors users, the fairness and the outage ratio. Simulation results show that when improvement in fairness is the main goal, the recently-proposed low-complexity Median Method (MM) and Quartile Mean Method (QMM) are major rivals to the widely-used Arithmetic Mean Method (AMM) and Original Mean Method (OMM), while the Modified Quartile Mean Method (MQMM) is the leader when the average throughput of indoor users is the most important factor.
{"title":"Performance evaluation of throughput averaging methods for the proportional fair algorithm in indoor mobile networks","authors":"V. Stoynov, Z. Valkova-Jarvis","doi":"10.1109/TELSKS.2017.8246270","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246270","url":null,"abstract":"Intelligent radio resource distribution techniques play an important role in improving the overall performance of next-generation networks. An efficient scheduling algorithm can help to achieve higher data rates, lower latency and increased fairness for users. This paper evaluates the performance of an indoor network, simulated using the Realistic Indoor Environment Generator (RIEG), when 11 different Throughput Averaging Methods (TAMs) for the Proportional Fair (PF) algorithm are used. The TAMs are compared by using a Comparative Factor (CF) that simultaneously takes into account the average throughput of the indoors users, the fairness and the outage ratio. Simulation results show that when improvement in fairness is the main goal, the recently-proposed low-complexity Median Method (MM) and Quartile Mean Method (QMM) are major rivals to the widely-used Arithmetic Mean Method (AMM) and Original Mean Method (OMM), while the Modified Quartile Mean Method (MQMM) is the leader when the average throughput of indoor users is the most important factor.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121160078","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246259
Đorđe Obradović, Z. Konjovic, E. Pap
This paper presents theoretical foundations of the linear fuzzy space, which allows for a simple but yet efficient modelling and representation of imprecise data. We also present applications of this theory to diversiform problems that call for imprecise data manipulation. The presented applications pertain to geo-spatial problems, medical imaging/diagnostics, and social networks analysis.
{"title":"Linear fuzzy space with applications","authors":"Đorđe Obradović, Z. Konjovic, E. Pap","doi":"10.1109/TELSKS.2017.8246259","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246259","url":null,"abstract":"This paper presents theoretical foundations of the linear fuzzy space, which allows for a simple but yet efficient modelling and representation of imprecise data. We also present applications of this theory to diversiform problems that call for imprecise data manipulation. The presented applications pertain to geo-spatial problems, medical imaging/diagnostics, and social networks analysis.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121160677","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246301
V. Gusevsky, A. Klementyeva, A. Komarov
A new technique for calculating the radiation patterns of linear equally spaced phased array antennas consisting of highly directional antenna elements with an increased interelement spacing is considered. The concept of point interpretation of the elements of a set of highly directional antennas turns out to be untenable, since the phase characteristic of each element in the far zone can be considered quasi-constant only in the angular limits of the width of the radiation pattern of the element.
{"title":"A novel method for calculating radiation patters of phased array antennas with an icreased interelement spacing","authors":"V. Gusevsky, A. Klementyeva, A. Komarov","doi":"10.1109/TELSKS.2017.8246301","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246301","url":null,"abstract":"A new technique for calculating the radiation patterns of linear equally spaced phased array antennas consisting of highly directional antenna elements with an increased interelement spacing is considered. The concept of point interpretation of the elements of a set of highly directional antennas turns out to be untenable, since the phase characteristic of each element in the far zone can be considered quasi-constant only in the angular limits of the width of the radiation pattern of the element.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132642258","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246245
Aleksandra I. Stojnev, D. Stojanović
Advances in sensor technologies, mobile positioning, IoT and wireless communications have led to development of applications for data collection, processing, analysis, mining and visualization for the purposes of real time responses and decision support, but have also brought new challenges to processing large amount of data in a real time. Various software systems are developed to provide a set of methods, technologies, algorithms and index structures for effective monitoring, processing, analysis and mining of continuous flow of data and events. This paper reviews recent developments in the field of data streams processing and analysis, gives an overview of existing systems and technologies, and demonstrates development of a stream processing application based on the contemporary stream processing frameworks.
{"title":"Software systems for processing and analysis of big data and event streams","authors":"Aleksandra I. Stojnev, D. Stojanović","doi":"10.1109/TELSKS.2017.8246245","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246245","url":null,"abstract":"Advances in sensor technologies, mobile positioning, IoT and wireless communications have led to development of applications for data collection, processing, analysis, mining and visualization for the purposes of real time responses and decision support, but have also brought new challenges to processing large amount of data in a real time. Various software systems are developed to provide a set of methods, technologies, algorithms and index structures for effective monitoring, processing, analysis and mining of continuous flow of data and events. This paper reviews recent developments in the field of data streams processing and analysis, gives an overview of existing systems and technologies, and demonstrates development of a stream processing application based on the contemporary stream processing frameworks.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"64 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128106933","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246247
Karuna S. Bhosale, M. Nenova, G. Iliev
As DDOS attacks interrupt internet services, DDOS tools confirm the effectiveness of the current attack. DDOS attack and countermeasures continue to increase in number and complexity. In this paper, we explore the scope of the DDoS flooding attack problem and attempts to combat it. A contemporary escalation of application layer distributed denial of service attacks on the web services has quickly transferred the focus of the research community from conventional network based denial of service. As a result, new genres of attacks were explored like HTTP GET Flood, HTTP POST Flood, Slowloris, R-U-Dead-Yet (RUDY), DNS etc. Also after a brief introduction to DDOS attacks, we discuss the characteristics of newly proposed application layer distributed denial of service attacks and embellish their impact on modern web services.
由于DDOS攻击中断了互联网服务，DDOS工具确认了当前攻击的有效性。DDOS攻击和应对措施的数量和复杂性不断增加。在本文中，我们探讨了DDoS洪水攻击问题的范围并尝试对抗它。当前应用层分布式拒绝服务攻击对web服务的攻击不断升级，已经迅速转移了传统的基于网络的拒绝服务攻击的研究重点。因此，新的攻击类型被探索，如HTTP GET Flood, HTTP POST Flood, Slowloris, R-U-Dead-Yet (RUDY)， DNS等。在简要介绍了DDOS攻击之后，我们讨论了新提出的应用层分布式拒绝服务攻击的特点，并详述了它们对现代web服务的影响。
{"title":"The distributed denial of service attacks (DDoS) prevention mechanisms on application layer","authors":"Karuna S. Bhosale, M. Nenova, G. Iliev","doi":"10.1109/TELSKS.2017.8246247","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246247","url":null,"abstract":"As DDOS attacks interrupt internet services, DDOS tools confirm the effectiveness of the current attack. DDOS attack and countermeasures continue to increase in number and complexity. In this paper, we explore the scope of the DDoS flooding attack problem and attempts to combat it. A contemporary escalation of application layer distributed denial of service attacks on the web services has quickly transferred the focus of the research community from conventional network based denial of service. As a result, new genres of attacks were explored like HTTP GET Flood, HTTP POST Flood, Slowloris, R-U-Dead-Yet (RUDY), DNS etc. Also after a brief introduction to DDOS attacks, we discuss the characteristics of newly proposed application layer distributed denial of service attacks and embellish their impact on modern web services.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"41 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124844762","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246226
U. Burnik
The article describes improvements in new video compression algorithm H.265/HEVC over predecessors. The efficiency of the algorithm has been verified on a test video file in multiple standard resolutions. The evaluation results indicate that the algorithm satisfies the goal of increasing the coding efficiency for high-resolution video sequences by 50% over previous algorithms.
{"title":"Objectives and performance of H.265/HEVC video coding standard","authors":"U. Burnik","doi":"10.1109/TELSKS.2017.8246226","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246226","url":null,"abstract":"The article describes improvements in new video compression algorithm H.265/HEVC over predecessors. The efficiency of the algorithm has been verified on a test video file in multiple standard resolutions. The evaluation results indicate that the algorithm satisfies the goal of increasing the coding efficiency for high-resolution video sequences by 50% over previous algorithms.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123816502","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246273
Răzvan Andrei Gheorghiu, V. Iordache, I. Bădescu
This paper aims to assess the possibility to implement low power, short distance standard communications technologies and cheaper technology for dedicated applications, such as data dynamic data collection, data distribution, or messaging, for better information of vehicles (and, in general, traffic participants). The main concern was to determine the already existing communications that are most probable to be found in the field. As Wi-Fi is the most used communication inside the buildings, but is also likely to be found in vehicles (for communication between their equipment of just used by mobile devices inside of them) the authors have considered that this should be the first step in determining characteristics of the wireless communication environment near the road network. Therefore, specific measurements regarding communications interferences and Wi-Fi channel density have been performed in some representative road junctions in Bucharest and along the most crowded public transport routes (buses and trams), with the results being useful in choosing proper ways for employing new communications with little chance of interferences.
{"title":"Analysis of possible Wi-Fi interferences of wireless communications implemented in vehicular environments","authors":"Răzvan Andrei Gheorghiu, V. Iordache, I. Bădescu","doi":"10.1109/TELSKS.2017.8246273","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246273","url":null,"abstract":"This paper aims to assess the possibility to implement low power, short distance standard communications technologies and cheaper technology for dedicated applications, such as data dynamic data collection, data distribution, or messaging, for better information of vehicles (and, in general, traffic participants). The main concern was to determine the already existing communications that are most probable to be found in the field. As Wi-Fi is the most used communication inside the buildings, but is also likely to be found in vehicles (for communication between their equipment of just used by mobile devices inside of them) the authors have considered that this should be the first step in determining characteristics of the wireless communication environment near the road network. Therefore, specific measurements regarding communications interferences and Wi-Fi channel density have been performed in some representative road junctions in Bucharest and along the most crowded public transport routes (buses and trams), with the results being useful in choosing proper ways for employing new communications with little chance of interferences.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126739919","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246323
Boban P. Bondzulic, B. Pavlović, M. Andric, V. Petrovic
We analyse the results of a comprehensive collection of objective quality metrics for high definition compressed visual content. The investigation provides guidelines that allow a reliable JPEG image quality assessment, and therefore the development of perceptual-based image/video coding standards. We show on a comprehensive, recent subjective dataset with visible differences that visual information fidelity, most apparent distortion, and gradient-based objective measures have reached the best agreement with the subjective quality scores, where contrast is preferred according to the luminance and structure changes.
{"title":"Comments on objective quality assessment of JPEG images with visible differences","authors":"Boban P. Bondzulic, B. Pavlović, M. Andric, V. Petrovic","doi":"10.1109/TELSKS.2017.8246323","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246323","url":null,"abstract":"We analyse the results of a comprehensive collection of objective quality metrics for high definition compressed visual content. The investigation provides guidelines that allow a reliable JPEG image quality assessment, and therefore the development of perceptual-based image/video coding standards. We show on a comprehensive, recent subjective dataset with visible differences that visual information fidelity, most apparent distortion, and gradient-based objective measures have reached the best agreement with the subjective quality scores, where contrast is preferred according to the luminance and structure changes.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"57 6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126127286","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 : 2017-10-01DOI: 10.1109/TELSKS.2017.8246254
A. Petrocchi, G. Crupi, V. Vadalà, G. Avolio, A. Raffo, D. Schreurs, A. Caddemi, G. Vannini
This study focuses on temperature dependent characterization of a 0.25×1500 μm2 GaN HEMT. The impact of the ambient temperature on the microwave performance is reported and discussed. It is achieved that the reduction of the average electron velocity with increasing temperature leads to a remarkably degradation of the main figures of merit.
本研究着重于0.25×1500 μm2 GaN HEMT的温度依赖性表征。报道并讨论了环境温度对微波性能的影响。结果表明，随着温度的升高，平均电子速度的降低会导致主要参量的显著降低。
{"title":"Thermal characterization of high-power GaN HEMTs up to 65 GHz","authors":"A. Petrocchi, G. Crupi, V. Vadalà, G. Avolio, A. Raffo, D. Schreurs, A. Caddemi, G. Vannini","doi":"10.1109/TELSKS.2017.8246254","DOIUrl":"https://doi.org/10.1109/TELSKS.2017.8246254","url":null,"abstract":"This study focuses on temperature dependent characterization of a 0.25×1500 μm2 GaN HEMT. The impact of the ambient temperature on the microwave performance is reported and discussed. It is achieved that the reduction of the average electron velocity with increasing temperature leads to a remarkably degradation of the main figures of merit.","PeriodicalId":206778,"journal":{"name":"2017 13th International Conference on Advanced Technologies, Systems and Services in Telecommunications (TELSIKS)","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121747479","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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