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5th IEEE International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Kundra, Laszlo ekler, peter Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781479972807

In this paper techniques are introduced for orientation estimation of wearable devices (like Google Glass) through bias compensation of gyroscope. The standard problem of using gyroscopes is that integration of raw angular rates with non-zero bias will lead to continuous drift of the estimated orientation. 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. This way a robust and reliable fusion was constructed, which matched our expectations, and has been validated with simulations and real world measurements.

关键词： adaptive filters cameras compensation feature extraction gyroscopes image fusion image sequences wearable computers Google Glass adaptive reliability filter bias elimination bias removal method complementary filters continuous orientation drift error model gyroscope bias compensation inertial sensing nonzero bias optical flow features raw gyroscope angular rates sensor fusion algorithm visual feature tracking-aided orientation estimation wearable devices Adaptive optics Cameras Estimation Gyroscopes Optical imaging Optical sensors Reliability Gyroscopes Cameras Wearable computers complementary filter error model adaptive filters adaptive optics optical sensors image sequences image fusion Optical Imaging Sensor fusion Optic Flow compensated Feature extraction

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The Analysis of Portals Considering Mobile Clients

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JOURNAL OF ADVANCED COMPUTATIONAL INTELLIGENCE AND INTELLIGENT INFORMATICS 2014年第3期18卷 306-310页

作者： Kocsis, Gergely ekler, peter Albert, Istvan Budapest Univ Technol & Econ Fac Elect Engn & Informat Dept Automat & Appl Informat Magyar Tudsok Krtja 2 H-1117 Budapest Hungary

Web analytics are used to retrieve anonymous information about users. We focus here on websites that support mobile clients. This information is important from the perspective of business analysis as web analytics help in making appropriate design decisions. Popular web sites may handle several million page views a day, so poor system design - even that related only to collecting statistics on user behavior - may produce performance bottlenecks or even system failures. This paper presents measurements based on a user-data database for a large mobile supported website and a model used when designing such sites.

关键词： website load mobile websites resource requirement estimation

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Increasing data distribution in BitTorrent networks by using network coding techniques

Increasing data distribution in BitTorrent networks by using...

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Proceedings of European Wireless 2015;21th European Wireless Conference

作者： Patrik J. Braun Marton Sipos peter ekler Hassan Charaf

Peer-to-peer networks are well known for their benefits when used for sharing data among multiple users. One of the most common protocols for shared data distribution is BitTorrent. Despite its popularity, it has some inefficiencies that affect the speed of the content distribution. In this paper we investigate methods to improve these inefficiencies by employing network coding. A BitTorrent protocol extension built on top of network coding is proposed that keeps backward compatibility with the basic BitTorrent protocol. With the help of a selfdeveloped simulation environment, we run several measurements of different scenarios. We focus on the initial phase in the distribution of the data, when only one seeder exists along with several leechers. We define a metric for the state of a network to make measurements easily and clearly comparable. Through our results, we show that BitTorrent doesn't behave efficiently at every stage of the content distribution process. By using our protocol extension, this inefficiency can be lowered or completely removed. This decreases the time taken for all peers to collect the data by up to 20%.

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Social Driving in Connected Car Environment

Social Driving in Connected Car Environment

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Proceedings of European Wireless 2015;21th European Wireless Conference

作者： peter ekler Tamas Balogh Tamas Ujj Hassan Charaf Laszlo Lengyel

Considering how the number of smartphones have increased and also how social networks became part of our daily life, it is predictable that social network driven services are about to dominate the near future. It is also noticeable that more and more external devices are involved in different type of IT solutions. These are smart watches, smarthome devices and even transportation devices. Furthermore, different smart city concepts are also becoming more and more popular. In this paper, we propose a mobile application based smart transportation solution, called Social Driving that combines the smart city concept with green transportation. Social Driving is based on our VehicleICT framework that is also introduced in this report. The base idea is that drivers can monitor different parameters of their cars and driving style, such as fuel consumption and CO2 emission, furthermore, they can compare these values with other drivers using similar cars and similar engine types. The solution creates different statistics and as a rewarding system motivates people to use their cars more efficiently. We describe architecture of the social driving concept, show and elaborate different measurement results derived from test drives and discuss the effectiveness of the system.

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On the Packet Delay Characteristics for Serially-Connected Links using Random Linear Network Coding with and without Recoding

On the Packet Delay Characteristics for Serially-Connected L...

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Proceedings of European Wireless 2015;21th European Wireless Conference

作者： Mate Toemoeskoezi Frank H. P. Fitzek Daniel E. Lucani Morten V. Pedersen Patrick Seeling peter ekler

Low latency and high reliability are critical characteristics of many wireless use cases, such as real-time video surveillance. In a dense network, the best way to resolve such problems is by utilizing the fastest and most reliable connection to the destination, typically through relaying. Classical solutions, such as Reed-Solomon codes, increase the reliability, but also introduce additional coding delays at the relays. This paper describes the reduction of the packet delay achievable by network coding through a series of network nodes. Our metric captures the elapsed time between (network) encoding RTP frames and complete decoding of the packets on the receiver side while playing out the video recording contained in the payload. Our solutions are implemented and evaluated on serially connected Raspberry Pi devices and a network (de)coding enabled software running on a regular PC. We find that the recoding relays work at least as well as the systematic approach to network coding. In all cases network coding outperformed schemes employing classical Reed-Solomon codes. This low per-packet delay and the inherent reliability of our schemes make these solutions particularly suitable for real-time multimedia delivery in contrast to other classical and network coding strategies.

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Improving Orientation Estimation in Mobiles with built-in Camera

Improving Orientation Estimation in Mobiles with built-in Ca...

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4th IEEE International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Kundra, Laszlo ekler, peter Charaf, Hassan Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781479915439;9781479915460

Orientation estimation and pedestrian tracking in mobiles have been examined by many in the last few years. Using sensors filtering, sensors fusion and even extended Kalman filters, there are still problems with orientation estimation. Although MEMS based gyroscopes are relatively cheap, many phones still lack these devices, for this an optical flow based solution is presented. In this paper we demonstrate the theory and feasibility of optical flow based virtual gyroscopes on an Android based handset. We examined two methods of feature detection, measured tracking results and constructed fusion of results with regular inertial sensor values. This way, we have not only substituted real gyroscope to a virtual one, but created a fused gyroscope sensor as well. Tests were recorded using a robotic arm to provide reliable results.

关键词： Gyroscopes

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Mobile Platforms and Multi-Mobile Platform Development

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ACTA CYBERNETICA 2014年第4期21卷 529-552页

作者： Charaf, Hassan ekler, peter Meszaros, Tamas Kelenyi, Imre Kovari, Bence Albert, Istvan Forstner, Bertalan Lengyel, Laszlo Budapest Univ Technol & Econ Budapest Hungary

Mobile devices and mobile applications have a significant effect on the present and on the future of the software industry. The diversity of mobile platforms necessitates the development of the same mobile application for all major mobile platforms, which requires considerable development effort. Mobile application developers are multiplatform developers, but they prioritize the platforms, therefore, not all platforms are equally important for them. Appropriate methods, processes and tools are required to support the development in order to achieve better productivity. The main motivation of our research activity is to provide a method, which increases the development productivity and the quality of the applications and also reduces the time to market. The paper discusses our model-driven results on the field of multi-mobile platform development.

关键词： Design Tools and Techniques Domain-specific architectures Domain engineering Reusable libraries Software Engineering Process

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Analysis of Mobile BitTorrent Client Behavior

Analysis of Mobile BitTorrent Client Behavior

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4th IEEE International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Csorba, Kristof ekler, peter Bori, Andras Charaf, Hassan Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781479915439;9781479915460

In this paper we analyze the anonymous reports provided by our Android based BitTorrent client called DrTorrent. This application is available for free and is a full featured torrent client. The reports allow us to analyze the usage patterns typical for mobile torrent clients. As the mobile devices have some special properties like processing power, energy, and bandwidth limitations, the behavior differs from the traditional desktop clients. Beside the several statistics on for instance the sizes of accessed torrents and download times, we present parametric estimation models for the number of peers for a given torrent, and for the rate of peers which can be successfully connected to. This research can be considered as a pioneer work in the field of analyzing large peer-to-peer networks in modern mobile environments. The described measurement results enable to understand the mobile BitTorrent behavior in details and the proposed models can be used also as a base model for designing other mobile peer-to-peer services.

关键词： BitTorrent Android smartphone usage statistics parametric approximation

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Resource Requirement Estimation of Advertising Websites\

Resource Requirement Estimation of Advertising Websites\

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13th IEEE International Symposium on Computational Intelligence and Informatics (CINTI)

作者： Kocsis, Gergely ekler, peter Origo Zrt Budapest Hungary Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781467352062;9781467352055

The page views of domestic advertising sites are one of the largest after social networking and online newspaper sites. Basically, we can make a distinction between two main types of measurement. One of them is the so-called, newspaper type" website where articles stay in the database in perpetuity. The system never deletes the users-data. The other type is called, advertising type" website where the system deletes expired ad and all related user-data. In this paper the "advertising type" of websites is considered. Web analytics is a process through which statistics about website usage and user behaviors are gathered. Such an analytics program can be used as a tool to get information about users, who they are, where they are coming from, how often they are visiting a website and how much time do they spend on a website. In this paper we show how to calculate the number of user-data records generated in the database per day and total from system startup in general. In addition, we use a detailed user-data database of a small classifieds website to illustrate the utility of models.

关键词： Web statistics Web analysis system and database design Web search engines

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Resource Requirements Estimating of Mobile Supported Websites

Resource Requirements Estimating of Mobile Supported Website...

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3rd IEEE International Conference on Cognitive Infocommunications (CogInfoCom)

作者： Kocsis, Gergely ekler, peter Origo Zrt Budapest Hungary Budapest Univ Technol & Econ Dept Automat & Appl Informat Budapest Hungary

ISBN: (纸本)9781467351881;9781467328913

The number of page views can be millions per day on large mobile websites, thus the amount of stored user-data (the amount of analytics data generated by a user visit event) can be millions per day as well. Poor system design, even related to gathering user behavior statistics, can lead to system crash, for example when the data-processing cost of operations is growing exponentially but the hardware performance under the application is around constant. Increasing the performance of the hardware exponentially is not possible in the practice, therefore only optimal data processing can lead to efficient system operation. Mobile web analytics is a process through which statistics about website usage and mobile user behaviors are gathered. Such an analytics program can be used as a tool to get information about mobile users, who they are, where they are coming from, how often they are visiting a website and how much time do they spend on a website. This information is very important from the perspective of business analysis as they helps to make appropriate decisions about a website. In this paper mobile supported websites are considered and it is shown how to calculate the number of user-data records generated in the database per day and total from system startup in general with the aim of estimating the resource requirements of a measurement/analyzing application to mobile supported sites. In addition, measurements are presented based on a user-data database of a large mobile supported website to illustrate the behavior of the proposed models.

关键词： Websites

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