Pub Date : 2015-07-13DOI: 10.1109/ConTEL.2015.7231215
A. Caric, M. Vuković, D. Jevtić
Global ICT services give the opportunity to construct communication platform for online consultations where ordinary citizens, different civic and business associations and executive bodies could contribute by exchanging information using communication network. Initiated by governing institutions or government bodies and non-state actors online consultations differ in goals, approaches, range of target groups, scope of topics and in the use of technical tools. The benefits are clearly recognized, for example online consultations promote the central regulatory objectives by providing the regulator with valuable input from industry members and other stakeholders and help to maintain a transparent regulatory environment. Public consultations therefore help regulators to make knowledgeable decisions. However, current online consultation practice in global area falls short of the potential. Coordination of the online consultation service by common, general purpose tools causes excessive wait times for answers, inefficient communication between experts, limited visibility of document sections and related information, which cause decreased access to public consultations, insufficient number of responses and in general weak participation level. We propose the model of automatic platform for online consultations. Proposed model cover all stages and relevant elements of public consultation procedures. The model is realized as network service and covers complete public consultation life cycle, i.e. starting the discussion, entering associated documents, amendments and comments, section analysis, decision-making and archiving. Novelty of the model presents core implementation in the form three-dimensional state matrix that covers consultation life cycle, time constraints, groupings, section segmentation, amendments association, etc. Commercial version of this model is deployed in Croatian regulatory authority for network industries.
{"title":"e-Consultation: Automatic system for online consultations","authors":"A. Caric, M. Vuković, D. Jevtić","doi":"10.1109/ConTEL.2015.7231215","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231215","url":null,"abstract":"Global ICT services give the opportunity to construct communication platform for online consultations where ordinary citizens, different civic and business associations and executive bodies could contribute by exchanging information using communication network. Initiated by governing institutions or government bodies and non-state actors online consultations differ in goals, approaches, range of target groups, scope of topics and in the use of technical tools. The benefits are clearly recognized, for example online consultations promote the central regulatory objectives by providing the regulator with valuable input from industry members and other stakeholders and help to maintain a transparent regulatory environment. Public consultations therefore help regulators to make knowledgeable decisions. However, current online consultation practice in global area falls short of the potential. Coordination of the online consultation service by common, general purpose tools causes excessive wait times for answers, inefficient communication between experts, limited visibility of document sections and related information, which cause decreased access to public consultations, insufficient number of responses and in general weak participation level. We propose the model of automatic platform for online consultations. Proposed model cover all stages and relevant elements of public consultation procedures. The model is realized as network service and covers complete public consultation life cycle, i.e. starting the discussion, entering associated documents, amendments and comments, section analysis, decision-making and archiving. Novelty of the model presents core implementation in the form three-dimensional state matrix that covers consultation life cycle, time constraints, groupings, section segmentation, amendments association, etc. Commercial version of this model is deployed in Croatian regulatory authority for network industries.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128165830","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231194
F. Knobloch
Visible light communications (VLC) could be used for public street lighting. The paper consists of two parts. A simulation model for direct current (DC) gain analysis with suitable improvements of channel gain and a first trial experiment are elaborated to find possible link configurations for dimming VLC in street lighting. The diffused channel gain is simulated to determine the non-directed optical power loss for a given photo diode. As a result neighbouring receivers detect -72.65 dBm optical power according to the DIN EN 13201 norm and using one BPW34 photo diode. The frame error rate (FER) is measured at different distances and received dimming levels for noncoherent dimming frequency shift On-Off keying (DFSOOK) and UART interface to evaluate the high loss. The FER has a minimum at 50% duty cycle. More effort in transceiver design is required, than in the current configuration, to guarantee a certain dimming range and low FER for street lighting.
可见光通信(VLC)可用于公共街道照明。本文由两部分组成。提出了一种适当改进通道增益的直流增益分析仿真模型，并进行了初步试验，以寻找路灯中调光VLC的可能链路配置。模拟了扩散通道增益，以确定给定光电二极管的非定向光功率损耗。因此，邻近的接收器检测-72.65 dBm光功率根据DIN EN 13201标准，并使用一个BPW34光电二极管。测量了不同距离下的帧误码率(FER)和接收的非相干调光频移开关键控(DFSOOK)和UART接口的调光水平，以评估其高损耗。在占空比为50%时，FER具有最小值。为了保证街道照明具有一定的调光范围和较低的误码率，需要在收发器设计上比目前的配置付出更多的努力。
{"title":"Channel gain and frame error rate for optical street lighting communication","authors":"F. Knobloch","doi":"10.1109/ConTEL.2015.7231194","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231194","url":null,"abstract":"Visible light communications (VLC) could be used for public street lighting. The paper consists of two parts. A simulation model for direct current (DC) gain analysis with suitable improvements of channel gain and a first trial experiment are elaborated to find possible link configurations for dimming VLC in street lighting. The diffused channel gain is simulated to determine the non-directed optical power loss for a given photo diode. As a result neighbouring receivers detect -72.65 dBm optical power according to the DIN EN 13201 norm and using one BPW34 photo diode. The frame error rate (FER) is measured at different distances and received dimming levels for noncoherent dimming frequency shift On-Off keying (DFSOOK) and UART interface to evaluate the high loss. The FER has a minimum at 50% duty cycle. More effort in transceiver design is required, than in the current configuration, to guarantee a certain dimming range and low FER for street lighting.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123900700","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231203
E. Dumic, S. Grgic, D. Frank, K. Sakic
This paper gives our findings on subjective assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems. For the purposes of our research a database consisting of 4 original HD video sequences was prepared with 30 degraded HD video sequences each, with various compression steps both in H.265/HEVC and H.264/AVC. The subjective assessment was conducted in one research laboratory in Croatia. The aim of this paper is to compare results obtained for H.265 versus H.264 Video Coding and to assess the performance of both standards. This assessment will help in the future decision on the coding standard that is going to be used in DVB-T2 networks in Croatia. Additionally, a status of the preparation activities for the allocation of the second digital dividend band in Croatia is given and further developments are described.
{"title":"Subjective quality assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems","authors":"E. Dumic, S. Grgic, D. Frank, K. Sakic","doi":"10.1109/ConTEL.2015.7231203","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231203","url":null,"abstract":"This paper gives our findings on subjective assessment of H.265 versus H.264 Video Coding for High-Definition Video Systems. For the purposes of our research a database consisting of 4 original HD video sequences was prepared with 30 degraded HD video sequences each, with various compression steps both in H.265/HEVC and H.264/AVC. The subjective assessment was conducted in one research laboratory in Croatia. The aim of this paper is to compare results obtained for H.265 versus H.264 Video Coding and to assess the performance of both standards. This assessment will help in the future decision on the coding standard that is going to be used in DVB-T2 networks in Croatia. Additionally, a status of the preparation activities for the allocation of the second digital dividend band in Croatia is given and further developments are described.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122829563","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231195
H. Ivanov, E. Leitgeb, T. Plank, P. Bekhrad, Tsvetan Mitsev
The performance of a Free Space Optical (FSO) communication system is highly dependent on the precise selection and adjustment of its operation parameters. The appropriate determination of the angle of divergence can noticeably compensate the negative impact of deviations of the optical beam from its main direction caused by a variety of deteriorative influences. Mathematical equations for calculating the optimum diverging angle are derived within this work. Regarding the obtained results, the link budget and the link margin of FSO systems are calculated. In addition, the dependence of the optimum divergence on the power and the wavelength of the optical source is investigated. In relation to this, enough figures showing evidently the better reliability of a FSO system in condition of beam wandering as well as other degradative impacts are attached.
{"title":"Link budget optimization of free space optical systems in relation to the beam diverging angle","authors":"H. Ivanov, E. Leitgeb, T. Plank, P. Bekhrad, Tsvetan Mitsev","doi":"10.1109/ConTEL.2015.7231195","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231195","url":null,"abstract":"The performance of a Free Space Optical (FSO) communication system is highly dependent on the precise selection and adjustment of its operation parameters. The appropriate determination of the angle of divergence can noticeably compensate the negative impact of deviations of the optical beam from its main direction caused by a variety of deteriorative influences. Mathematical equations for calculating the optimum diverging angle are derived within this work. Regarding the obtained results, the link budget and the link margin of FSO systems are calculated. In addition, the dependence of the optimum divergence on the power and the wavelength of the optical source is investigated. In relation to this, enough figures showing evidently the better reliability of a FSO system in condition of beam wandering as well as other degradative impacts are attached.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"155 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116629454","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231228
Hakim Adhari, E. Rathgeb, Amanpreet Singh, A. Könsgen, C. Görg
Fairness amongst the competing flows at the transport layer has always been an important topic, however, the current definition based on the TCP-compatible view is not always suitable. With the increasing deployment of multipath transport protocols such as Multipath TCP (MPTCP) and the Concurrent Multipath Transfer extension of SCTP (CMT-SCTP), the term “fair” can have various interpretations. In this paper, inconsistencies are avoided by classifying fairness definitions according to the resource - bottleneck or network - and the participants - subflow, flow, tariff, etc. that share the resource. With example network scenarios the current (TCP-compatible) fairness view from both the single and multipath perspective is presented and their shortcomings discussed. Alternative definitions are introduced and their benefits are illustrated based on a theoretical analysis. The realization aspects of the discussed fairness definitions are also presented. The evaluations of available coupled congestion control variants for multipath transport are shown to highlight the proximity of the simulated results to the theoretical target values. Due to the complexity of the realization of network-based approaches, bottleneck is chosen as the preferred resource. Tariff is a promising participant as it couples applications and incorporates economic entities for fair resource sharing at the transport layer1.
{"title":"Transport layer fairness revisited","authors":"Hakim Adhari, E. Rathgeb, Amanpreet Singh, A. Könsgen, C. Görg","doi":"10.1109/ConTEL.2015.7231228","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231228","url":null,"abstract":"Fairness amongst the competing flows at the transport layer has always been an important topic, however, the current definition based on the TCP-compatible view is not always suitable. With the increasing deployment of multipath transport protocols such as Multipath TCP (MPTCP) and the Concurrent Multipath Transfer extension of SCTP (CMT-SCTP), the term “fair” can have various interpretations. In this paper, inconsistencies are avoided by classifying fairness definitions according to the resource - bottleneck or network - and the participants - subflow, flow, tariff, etc. that share the resource. With example network scenarios the current (TCP-compatible) fairness view from both the single and multipath perspective is presented and their shortcomings discussed. Alternative definitions are introduced and their benefits are illustrated based on a theoretical analysis. The realization aspects of the discussed fairness definitions are also presented. The evaluations of available coupled congestion control variants for multipath transport are shown to highlight the proximity of the simulated results to the theoretical target values. Due to the complexity of the realization of network-based approaches, bottleneck is chosen as the preferred resource. Tariff is a promising participant as it couples applications and incorporates economic entities for fair resource sharing at the transport layer1.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116509390","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231216
D. Lucic, A. Caric, I. Lovrek
The paper deals with the standardisation and regulatory context of Machine-to-Machine communications and the changes they cause in an electronic communications ecosystem. Research, innovation and market positioning of Machine-to-Machine communications in addressing global societal challenges is presented. Standardisation and adoption of interoperable standards are elaborated from the view of competition, investment and market development. Numbering and addressing, roaming, privacy and data security, and spectrum are discussed in terms of activities to be undertaken by the national regulatory authority. A case study on Machine-to-Machine communications in Croatia is given.
{"title":"Standardisation and regulatory context of machine-to-machine communication","authors":"D. Lucic, A. Caric, I. Lovrek","doi":"10.1109/ConTEL.2015.7231216","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231216","url":null,"abstract":"The paper deals with the standardisation and regulatory context of Machine-to-Machine communications and the changes they cause in an electronic communications ecosystem. Research, innovation and market positioning of Machine-to-Machine communications in addressing global societal challenges is presented. Standardisation and adoption of interoperable standards are elaborated from the view of competition, investment and market development. Numbering and addressing, roaming, privacy and data security, and spectrum are discussed in terms of activities to be undertaken by the national regulatory authority. A case study on Machine-to-Machine communications in Croatia is given.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130423909","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 : 2015-07-13DOI: 10.1109/ConTEL.2015.7231205
V. Pouli, S. Kafetzoglou, Eirini-Eleni Tsiropoulou, Aggeliki Dimitriou, S. Papavassiliou
Emerging multimedia interactive services inherently call for user-centered design approaches, where the involved high degree of interactivity requires the implementation of efficient and effective information retrieval approaches. In this paper, a multimodal content retrieval framework is introduced that employs personalization along with relevance feedback techniques in order to enhance provided QoE, by retrieving and offering multimedia content tailored to individual users' characteristics and/or preferences. The developed Relevance Feedback mechanism engages the user into assessing the relevance of the initially retrieved results list of the original query, and through one or more iterations to present him with the most relevant result list based on his feedback. Our proposed framework implements a similarity learning scheme to improve multimedia content retrieval, towards increasing user experience. A model for implicit relevance feedback is formulated and a confidence level parameter is introduced to classify the results, based on the Jaccard similarities of the results that did not receive explicit feedback with those that did. This relevance feedback mechanism acts complementary to the personalized search by reranking the initial retrieved set in iterative rounds. The performance and effectiveness of the proposed framework was evaluated and demonstrated through an extensive experimental study, utilizing an interactive multimodal multimedia web-based system, with media files consisting of a set of 3D movies containing audio-visual content with high and low level semantic annotations.
{"title":"Personalized multimedia content retrieval through relevance feedback techniques for enhanced user experience","authors":"V. Pouli, S. Kafetzoglou, Eirini-Eleni Tsiropoulou, Aggeliki Dimitriou, S. Papavassiliou","doi":"10.1109/ConTEL.2015.7231205","DOIUrl":"https://doi.org/10.1109/ConTEL.2015.7231205","url":null,"abstract":"Emerging multimedia interactive services inherently call for user-centered design approaches, where the involved high degree of interactivity requires the implementation of efficient and effective information retrieval approaches. In this paper, a multimodal content retrieval framework is introduced that employs personalization along with relevance feedback techniques in order to enhance provided QoE, by retrieving and offering multimedia content tailored to individual users' characteristics and/or preferences. The developed Relevance Feedback mechanism engages the user into assessing the relevance of the initially retrieved results list of the original query, and through one or more iterations to present him with the most relevant result list based on his feedback. Our proposed framework implements a similarity learning scheme to improve multimedia content retrieval, towards increasing user experience. A model for implicit relevance feedback is formulated and a confidence level parameter is introduced to classify the results, based on the Jaccard similarities of the results that did not receive explicit feedback with those that did. This relevance feedback mechanism acts complementary to the personalized search by reranking the initial retrieved set in iterative rounds. The performance and effectiveness of the proposed framework was evaluated and demonstrated through an extensive experimental study, utilizing an interactive multimodal multimedia web-based system, with media files consisting of a set of 3D movies containing audio-visual content with high and low level semantic annotations.","PeriodicalId":134613,"journal":{"name":"2015 13th International Conference on Telecommunications (ConTEL)","volume":"132 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2015-07-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129984309","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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