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International Conference on Models and Technologies for Intelligent Transportation Systems (MT-ITS)

作者： Szalay, Zsolt Kanya, Zoltan Lengyel, Laszlo ekler, peter Ujj, Tamas Balogh, Tamas Charaf, Hassan Budapest Univ Technol & Econ 6 Stoczek Str Bld J Room 505 H-1111 Budapest Hungary Inventure Automot Elect R&D Budapest Hungary

ISBN: (纸本)9789633131428

The focus of the research and development activities in Intelligent Transportation Systems is to increase road traffic safety and improve transport efficiency. Telematics Systems can provide values on both fields, by providing real-time reliable vehicle specific information [1]. Road vehicle related information can be categorized into several types, but technical information provided through the electronic network of today's vehicles is becoming an increasingly important segment. Using the standard on-board diagnostics (OBD) is a popular solution nowadays for getting out technical data from the vehicle, but it has its limitations [2]. Professional systems rather use direct access to the vehicles CAN network to extract more detailed technical data out from the ECU communication [3]. Even automatic vehicle location (AVL) service providers have difficulties in differentiating between the possibilities and potentials of CAN bus and OBD. This article clearly identifies the differences between the solutions available on the market, by means of comparing the FMS CAN standard, the OBD standard and the Proprietary Vehicle CAN protocol. The comparison is not only theoretical, but it is based on different measurements and analysis. The measurement results demonstrate the benefits and limitations of these information sources. For the measurement we have used our VehicleICT [4] framework that provided the platform for storing and analyzing the data. Based on the provided comparison, the identified advantages and disadvantages of certain source types, we can select the proper solution for a specific requirement. One objective of this research activity is to clarify confusions about the relation of OBD and CAN from the Telematics Systems providers point of view. Besides that this research can be also considered as a pioneer work that demonstrates the capabilities of our VehicleICT framework.

关键词： CAN bus Fleet Management FMS standard ICT in road vehicles ITS OBD Proprietary Vehicle CAN Smart Transportation Telematics Vehicle diagnostics

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An analysis on the revoking mechanisms for JSON Web Tokens

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INTERNATIONAL JOURNAL OF DISTRIBUTED SENSOR NETWORKS 2018年第9期19卷 1-10页

作者： Janoky, Laszlo Viktor Levendovszky, Janos ekler, peter Budapest Univ Technol & Econ Dept Automat & Appl Informat Magyar Tudosok Krt 2 H-1117 Budapest Hungary Budapest Univ Technol & Econ Dept Telecommun & Media Informat Budapest Hungary

JSON Web Tokens provide a scalable solution with significant performance benefits for user access control in decentralized, large-scale distributed systems. Such examples would entail cloud-based, micro-services styled systems or typical Internet of Things solutions. One of the obstacles still preventing the wide-spread use of JSON Web Token-based access control is the problem of invalidating the issued tokens upon clients leaving the system. Token invalidation presently takes a considerable processing overhead or a drastically increased architectural complexity. Solving this problem without losing the main benefits of JSON Web Tokens still remains an open challenge which will be addressed in the article. We are going to propose some solutions to implement low-complexity token revocations and compare their characteristics in different environments with the traditional solutions. The proposed solutions have the benefit of preserving the advantages of JSON Web Tokens, while also adhering to stronger security constraints and possessing a finely tuneable performance cost.

关键词： JSON Web Tokens security access control distributed systems

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Energy-Efficient Routing in Wireless Sensor Networks

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ACTA CYBERNETICA 2021年第2期25卷 421-434页

作者： Pasztor, Daniel ekler, peter Levendovszky, Janos Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary Budapest Univ Technol & Econ Dept Networked Syst & Serv Budapest Hungary

Efficient data collection is the core concept of implementing Industry4.0 on IoT platforms. This requires energy aware communication protocols for Wireless Sensor Networks (WSNs) where different functions, like sensing and processing on the IoT nodes is supported only by local battery power. Thus, energy aware network protocols, such as routing, became one of the fundamental challenges in IoT data collection schemes. In our research, we have developed a novel routing algorithm which aims at increasing the lifetime of the IoT network subject to pre-defined reliability constraints. Assuming that the data is split and transmitted in the form of packets, we seek the optimal paths over which packets can reach the Base Station (BS) with effective energy usage subject to the condition that the probability of successful packet arrival to the BS exceeds a pre-defined threshold (reliability parameter). As far as the radio propagation is concerned we use Rayleigh-fading in our model. The new algorithm will guarantee an increased longevity and information throughput of the network due to the efficient energy balancing in the IoT network. The performance of the new protocol has also been studied and confirmed by simulations.

关键词： IoT WSN energy-efficient routing WiFi

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The Accuracy of Power Law Based Similarity Model in Phonebook-Centric Social Networks

The Accuracy of Power Law Based Similarity Model in Phoneboo...

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International Conference on Wireless and Mobile Communications (ICWMC)

作者： peter ekler Tamas Lukovszki Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Budapest Hungary Faculty of Informatics Eötvös Lonránd University Budapest Hungary

Social networks are becoming increasingly popular nowadays. The increasing capabilities of mobile phones enable them to participate in such networks. We should consider the fact, that the phonebooks in the mobile devices represent social relationships that can be integrated in the social networks. Such networks provide a synchronization mechanism between phonebooks of the users and the social network which allows detecting other users listed in the phonebooks. Users can accept detected similarities. After that, if one of their contacts changes her or his personal detail, it will be propagated automatically into the phonebooks, after considering privacy settings. Estimating the total number of these similarities is a key issue from scalability point of view in such networks. We implemented a phonebook-centric social network, called Phonebookmark and investigated the structure of the network. Previously it was shown that the distribution of similarities follows a power law. Also a model was proposed by us, which can be used to calculate the total number of similarities. However the accuracy of the model is another question, because of the infinite variance of the power law distribution. The contribution of this paper is that using the fact that a member of the network can only be involved in a limited number of similarities results in a similarity distribution with a finite variance. Therefore, central limit theorems can be used to show the accuracy of our estimation of the total number of similarities. However the model can be used in other power law distributions which apply to the requirements.

关键词： Mobile handsets Facebook Accuracy Internet Image edge detection Upper bound

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Experiences with Phonebook-Centric Social Networks

Experiences with Phonebook-Centric Social Networks

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Consumer Communications and Networking Conference, CCNC IEEE

作者： peter ekler Tamas Lukovszki Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary Faculty of Informatics Eötvös Lonránd University Hungary

ISBN: (纸本)9781424451753

Social networks are becoming more and more popular nowadays. The increasing capabilities of mobile phones enable them to participate in such networks. The phonebooks in the mobile devices represent social relationships, that can be integrated in the social networks. Following we refer to this solution as phonebook-centric social networks. Such networks provide a synchronization mechanism between phonebooks of the users and the social network which allows detecting network members listed in the phonebooks (semi-) automatically. The detection of those members is based on the similarity of the personal data, e.g., similar name, same phone number, address, etc... Users can mark similarities between their phonebook contacts and members in the network. After this, if one of their contacts changes her or his personal detail, it will be propagated automatically into the phonebooks, after considering privacy settings. Synchronization time and energy consumption for synchronization on the mobiles and the scalability of the system strongly depend on the number of users and similarities. We have implemented a phonebook-centric social network, called Phonebookmark and investigated the structure of the network. We experienced that the distribution of similarities follows a power law, as well as the distribution of the in- and out-degrees in the social network. In this paper we propose a model for estimating the total number of similarities and we show that this estimation applies very well to the historical data of Phonebookmark.

关键词： Social network services Mobile handsets Informatics Privacy Scalability IP networks Communications Society Automation Paper technology Power generation economics

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Evaluating the Performance of a Novel JWT Revocation Strategy

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ACTA CYBERNETICA 2021年第2期25卷 307-318页

作者： Janoky, Laszlo Viktor ekler, peter Levendovszky, Janos Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary Budapest Univ Technol & Econ Dept Networked Syst & Serv Budapest Hungary

JSON Web Tokens (JWT) provide a scalable, distributed way of user access control for modern web-based systems. The main advantage of the scheme is that the tokens are valid by themselves - through the use of digital signing - also imply its greatest weakness. Once issued, there is no trivial way to revoke a JWT token. In our work, we present a novel approach for this revocation problem, overcoming some of the problems of currently used solutions. To compare our solution to the established solutions, we also introduce the mathematical framework of comparison, which we ultimately test using real-world measurements.

关键词： JWT JSON Web Tokens user access control

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Implementation of Network Coding with Recoding for Unequal-sized and Header Compressed Traffic

Implementation of Network Coding with Recoding for Unequal-s...

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IEEE Wireless Communications and Networking Conference (WCNC)

作者： Taghouti, Maroua Tomoskozi, Mate Howeler, Malte Lucani, Daniel E. Fitzek, Frank H. P. Bouallegue, Ammar ekler, peter Tech Univ Dresden Deutsch Telekom Chair Commun Networks Dresden Germany Univ Carthage Tunisia Polytech Sch Tunis Tunisia Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary Aarhus Univ Dept Engn Aarhus Denmark

ISBN: (纸本)9781538676462

Coding techniques that are employed to resolve packet losses on wireless channels, such as Random Linear Network Coding (RLNC), market themselves with the advantage of requiring less signalling, as well as, retransmissions of missing packets to compensate for losses on unreliable links. However, as packet sizes of IP-based protocols can be distributed irregularly over the available maximum frame size and can vary considerably packet-by-packet, the current implementations of RLNC suffer from shifting header and/or payload lengths and lack a suitable way of compensation. The simplest solution adopted by most RLNC approaches is to pad the unequal packets with zeros to the maximum packet size, thus creating an unnecessary transmission overhead of 100 % or more. This paper presents a practical implementation of the new progressive shortening based RLNC for the first time. This scheme utilizes fixed-sized regions inside the packets to resolve the zero-padding overhead and generates unequal-sized coded packets. Furthermore, it introduces a recoding feature for this scheme, which is another advantage of RLNC over other coding techniques, and breaks with the point-to-point topology considered in previous works. Moreover, we combine this novel macro-symbol based coding scheme with Robust Header Compression version 2 (RoHCv2) to show the gain over traditional implementation of RLNC in a real-life application where varying packet lengths dominate during transmissions. Our implementations results, using the KODO network coding library, show that the encoding throughput is as good as the established RLNC methods, and the payload delivery efficiency can be enhanced by up to 20 %.

关键词： Encoding Decoding Network coding Protocols Redundancy Complexity theory Conferences

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Wireless Applications of Mobile Egomotion Estimation with Computer Vision

Wireless Applications of Mobile Egomotion Estimation with Co...

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Proceedings of European Wireless 2015;21th European Wireless Conference

作者： Laszlo Kundra peter ekler Hassan Charaf

In this paper a summary of our orientation estimation algorithm is introduced with a focus on application areas on mobiles and in wireless environments. The standard problem of using gyroscopes for orientation estimation is that integration of raw angular rates with non-zero bias will lead to continuous drift of the result angle. To examine the nature of this bias, a simple error model was constructed for the whole device in terms of inertial sensing. For eliminating the bias, a sensor fusion algorithm was developed using the benefits of optical flow from the camera of the device. Our orientation estimator and bias removal method is based on complementary filters, in combination with an adaptive reliability filter for the optical flow features. The feedback of the fused result is combined with the raw gyroscope angular rates to compensate the bias. Various measurements were recorded on a real device running the demanding optical flow onboard. Our results are tested and reliable, and are able to enhance different application from the field of physics-education to current robust unmanned vehicles.

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BitTorrent at Mobile Phones

BitTorrent at Mobile Phones

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Consumer Communications and Networking Conference, CCNC IEEE

作者： peter ekler Imre Kelenyi Hassan Charaf Department of Automation and Applied Informatics Budapest University슠of슠Technology슠and슠Economics Hungary

BitTorrent is one of the most efficient peer-to-peer content sharing protocols. The authors took part in implementing SymTorrent: a full featured BitTorrent client application for high-end mobile phones based on Symbian OS. Recently, they have also brought the BitTorrent technology to low-end mobile by creating a prototype application, called MobTorrent. Currently MobTorrent supports only content downloading (implementation of upload functionality is ongoing). The target platform of MobTorrent is the S40 platform, which is based on the Java Micro Edition technology. This paper contains a brief overview of the BitTorrent protocol, introduces the applications and outlines the demonstration.

关键词： Mobile handsets Peer to peer computing Java Automation Informatics Prototypes Access protocols Paper technology Current measurement Velocity measurement

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Comparing OBD and CAN Sampling on the go with the SensorHUB Framework

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Procedia Engineering 2016年 168卷 39-42页

作者： David Sik Tamas Balogh peter ekler Laszlo Lengyel Budapest University of Technology and Economics Magyar tudósok körútja 2. Budapest 1111 Hungary AutSoft Ltd. Neumann János u. 1. Infopark A épület Budapest 1117 Hungary

In this paper we present our VehicleICT platform, which we use for comparing the OBD-II and CAN bus data from vehicles. VehicleICT platform is based on the SensorHUB framework. We present a novel measurement tool called ObdCanCompare that collects vehicle sensor data and shows them on our smartphone. Meanwhile the data gets aggregated, processed and loaded into a Hadoop-based data store. There we can develop business intelligence reports, various charts and dashboards. Using the measurements our goal is to decide which interface will be used for our connected car-based application called Social Driving.

关键词： Sensor OBD CAN ICT Vehicle BI Big Data

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