Pub Date : 2013-10-01DOI: 10.1109/TELSKS.2013.6704883
P. Russer
The aim of this contribution is to show that electromagnetic theory can be simplified and clarified by geometric formulation. The geometric formulation of Maxwell's theory accomplished by exterior differential calculus introduces geometrical imagery and supports physical understanding. Exterior differential calculus has simple and concise rules for computation. The objects of exterior differential calculus have a clear geometrical significance and the laws of electromagnetics assume a simple and elegant form.
{"title":"The geometric representation of electrodynamics by exterior differential forms","authors":"P. Russer","doi":"10.1109/TELSKS.2013.6704883","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704883","url":null,"abstract":"The aim of this contribution is to show that electromagnetic theory can be simplified and clarified by geometric formulation. The geometric formulation of Maxwell's theory accomplished by exterior differential calculus introduces geometrical imagery and supports physical understanding. Exterior differential calculus has simple and concise rules for computation. The objects of exterior differential calculus have a clear geometrical significance and the laws of electromagnetics assume a simple and elegant form.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121900270","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704942
A. Gavrovska, G. Zajic, I. Reljin, V. Bogdanovic, B. Reljin
In this paper, the cardiosignal analysis using second generation wavelets and lifting structure based on clinically-relevant extracted information is described. The information extraction can be performed by different spectral (such as multifractal) and spectrogram (time-frequency) representations. Here, the novelties are related mainly to the knowledge-controlled analysis and noise reduction in phonocardiograms. We suggest adaptive (signal-dependent) wavelet-based processing able to simultaneously preserve relevant high-frequency details and reduce noise.
{"title":"Second generation wavelets: Advantages in cardiosignal processing","authors":"A. Gavrovska, G. Zajic, I. Reljin, V. Bogdanovic, B. Reljin","doi":"10.1109/TELSKS.2013.6704942","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704942","url":null,"abstract":"In this paper, the cardiosignal analysis using second generation wavelets and lifting structure based on clinically-relevant extracted information is described. The information extraction can be performed by different spectral (such as multifractal) and spectrogram (time-frequency) representations. Here, the novelties are related mainly to the knowledge-controlled analysis and noise reduction in phonocardiograms. We suggest adaptive (signal-dependent) wavelet-based processing able to simultaneously preserve relevant high-frequency details and reduce noise.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123027369","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704426
V. Papež, S. Papezova
This paper describes a circuit arrangement, design and construction of the power load composed of many pieces of thick film flanged resistors, which are serial-parallel connected so that the resulting combination showed the desired impedance-resistance, which may or may not be consistent with the resistance of individual components and, at the same time, it can be loaded with more power than a single component. The solution is given to the compensation circuit which increases several times the maximum frequency at which the load is applied.
{"title":"Frequency compensated high power matrix resistor network","authors":"V. Papež, S. Papezova","doi":"10.1109/TELSKS.2013.6704426","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704426","url":null,"abstract":"This paper describes a circuit arrangement, design and construction of the power load composed of many pieces of thick film flanged resistors, which are serial-parallel connected so that the resulting combination showed the desired impedance-resistance, which may or may not be consistent with the resistance of individual components and, at the same time, it can be loaded with more power than a single component. The solution is given to the compensation circuit which increases several times the maximum frequency at which the load is applied.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123033562","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704424
D. Vucic, M. Eric, I. Pokrajac
A new, matrix-based, stochastic method for cyclic spectral analysis of MB-OFDM signals, based on their Markov chain representation, is proposed. Explicit expression for the cyclic spectrum of these signals is derived. Some theoretical and simulation results for the spectral correlation characterization of MB-OFDM signals are presented, as well.
{"title":"Spectral correlation characterization of MB-OFDM signals","authors":"D. Vucic, M. Eric, I. Pokrajac","doi":"10.1109/TELSKS.2013.6704424","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704424","url":null,"abstract":"A new, matrix-based, stochastic method for cyclic spectral analysis of MB-OFDM signals, based on their Markov chain representation, is proposed. Explicit expression for the cyclic spectrum of these signals is derived. Some theoretical and simulation results for the spectral correlation characterization of MB-OFDM signals are presented, as well.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127766722","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704410
A. Jevremović, Nenad Ristić, M. Veinovic
Nowadays there is growing issue in protecting PHP scripts from unwanted using, copying and modifications. Existing solutions on source code level are mostly working as obfuscators, are free, and are not providing any serious protection. Solutions that encode opcode are more secure but are commercial and require closed-source proprietary PHP interpreter's extension. Additionally, encoded opcode is not compatible with future versions of interpreters which imply rebuying encoders from authors. Finally, if extension source-code is compromised, all script encoded by that solution are compromised too. In this paper we present a novel model for free and open-source PHP script protection solution. Protection level provided by proposed solution is equal to protection level of commercial solutions. Model is based on conclusions from using standard cryptology models for analyzing strengths and weaknesses of existing solutions when scripts protection is seen as secure communication channel in cryptology.
{"title":"Improving protection of PHP source code using cryptology models","authors":"A. Jevremović, Nenad Ristić, M. Veinovic","doi":"10.1109/TELSKS.2013.6704410","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704410","url":null,"abstract":"Nowadays there is growing issue in protecting PHP scripts from unwanted using, copying and modifications. Existing solutions on source code level are mostly working as obfuscators, are free, and are not providing any serious protection. Solutions that encode opcode are more secure but are commercial and require closed-source proprietary PHP interpreter's extension. Additionally, encoded opcode is not compatible with future versions of interpreters which imply rebuying encoders from authors. Finally, if extension source-code is compromised, all script encoded by that solution are compromised too. In this paper we present a novel model for free and open-source PHP script protection solution. Protection level provided by proposed solution is equal to protection level of commercial solutions. Model is based on conclusions from using standard cryptology models for analyzing strengths and weaknesses of existing solutions when scripts protection is seen as secure communication channel in cryptology.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116337451","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704446
Ljubomir Ivanis, S. Adamovic, A. Jevremović
This paper describes security problems in communication between DNS service and its clients. It describes the use of new technologies that provide increased safety in terms of communication, and their application to a specific case. The paper is based on the experiences gained during the implementation of security solutions in CPU Ltd., specifically the section relating to the protection of DNS service from abuse. This paper will describe some practical solutions that have been implemented.
{"title":"Case study: DNS service protection methods","authors":"Ljubomir Ivanis, S. Adamovic, A. Jevremović","doi":"10.1109/TELSKS.2013.6704446","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704446","url":null,"abstract":"This paper describes security problems in communication between DNS service and its clients. It describes the use of new technologies that provide increased safety in terms of communication, and their application to a specific case. The paper is based on the experiences gained during the implementation of security solutions in CPU Ltd., specifically the section relating to the protection of DNS service from abuse. This paper will describe some practical solutions that have been implemented.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116744006","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704461
Aleksandra Denda, D. Drajic
The main objective of this consolidation work is to define and implement TO - BE Incident Management process between three different company that operate in three different countries which incorporate both eTOM and ITIL frameworks taking in eTOM process definitions within the context of the wider ITIL processes. It will enable process automation for network and service assurance for multi-vendor, multi-technology resource infrastructures. Implementation of the new common regional Service management system together with the redesign and implementation of new service management processes are expected to enable the effective and efficient delivery of services and support of changing business needs.
{"title":"Aligned software and process models with both the eTOM framework and the ITIL processes","authors":"Aleksandra Denda, D. Drajic","doi":"10.1109/TELSKS.2013.6704461","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704461","url":null,"abstract":"The main objective of this consolidation work is to define and implement TO - BE Incident Management process between three different company that operate in three different countries which incorporate both eTOM and ITIL frameworks taking in eTOM process definitions within the context of the wider ITIL processes. It will enable process automation for network and service assurance for multi-vendor, multi-technology resource infrastructures. Implementation of the new common regional Service management system together with the redesign and implementation of new service management processes are expected to enable the effective and efficient delivery of services and support of changing business needs.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"184 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117340111","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704937
S. Brkić, M. Eric
In this paper a practical implementation of joint spatio-temporal spectrum sensing method based on direct localization is presented. The chosen algorithm was implemented in FPGA (Field-Programmable Gate Array) technology which can provide necessary computation power for executing complex sensing operation and achieves sensing duration measured in microseconds.
{"title":"FPGA Implementation of Joint Spatio-Temporal Spectrum Sensing Algorithm Based on Direct Localization Method","authors":"S. Brkić, M. Eric","doi":"10.1109/TELSKS.2013.6704937","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704937","url":null,"abstract":"In this paper a practical implementation of joint spatio-temporal spectrum sensing method based on direct localization is presented. The chosen algorithm was implemented in FPGA (Field-Programmable Gate Array) technology which can provide necessary computation power for executing complex sensing operation and achieves sensing duration measured in microseconds.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115306149","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704399
L. Vietzorreck, Taeyoung Kim
In this paper novel concepts for space communication systems are introduced. A switch matrix system for satellite applications based on RF MEMS switches is described. For space applications RF MEMS switches have several advantages compared to their mechanical or solid-state counterparts. They are small, compact and lightweight with a high linearity up to high frequencies. The simulated performance of the 12×12 switch matrix is below -12dB IL (Insertion Loss) up to C band and better than -15dB RL (Return Loss) up to Ku band. Moreover, it has a good isolation better than -50dB. Technology, performance and limitations of the proposed system are discussed.
{"title":"RF MEMS based systems for space communications","authors":"L. Vietzorreck, Taeyoung Kim","doi":"10.1109/TELSKS.2013.6704399","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704399","url":null,"abstract":"In this paper novel concepts for space communication systems are introduced. A switch matrix system for satellite applications based on RF MEMS switches is described. For space applications RF MEMS switches have several advantages compared to their mechanical or solid-state counterparts. They are small, compact and lightweight with a high linearity up to high frequencies. The simulated performance of the 12×12 switch matrix is below -12dB IL (Insertion Loss) up to C band and better than -15dB RL (Return Loss) up to Ku band. Moreover, it has a good isolation better than -50dB. Technology, performance and limitations of the proposed system are discussed.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127149115","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 : 2013-10-01DOI: 10.1109/TELSKS.2013.6704909
Goran Murić, D. Macura, N. Gospic, D. Bogojevic
In this paper the new approach to assessment an importance/criticality of elements within the critical information infrastructure is presented. The proposed method is based on the identification of critical routes within the network, and the recognition of the most important nodes without using centrality measures and simulation techniques. The elements and their dependencies within the information infrastructure are transformed into a relational topological graph. The elements are presented as the nodes, and the relations between them as the edges of the graph.
{"title":"An approach to assess criticality of elements in the process of information infrastructure protection","authors":"Goran Murić, D. Macura, N. Gospic, D. Bogojevic","doi":"10.1109/TELSKS.2013.6704909","DOIUrl":"https://doi.org/10.1109/TELSKS.2013.6704909","url":null,"abstract":"In this paper the new approach to assessment an importance/criticality of elements within the critical information infrastructure is presented. The proposed method is based on the identification of critical routes within the network, and the recognition of the most important nodes without using centrality measures and simulation techniques. The elements and their dependencies within the information infrastructure are transformed into a relational topological graph. The elements are presented as the nodes, and the relations between them as the edges of the graph.","PeriodicalId":144044,"journal":{"name":"2013 11th International Conference on Telecommunications in Modern Satellite, Cable and Broadcasting Services (TELSIKS)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2013-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124937357","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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