检索结果-内蒙古大学图书馆

2013 IEEE 11th International Symposium on applied Machine Intelligence and informatics, SAMI 2013

作者： Maroti, Arpad Szaloki, David Kiss, Domokos Tevesz, Gabor Department of Automation and Applied Informatics Budapest University of Technology and Economics Magyar Tudósok körútja 2 H-1117 Budapest Hungary

ISBN: (纸本)9781467359290

The Dynamic Window Approach (DWA) to collision avoidance is a well-known and elegant method in the mobile robotics field. It provides a collision-free navigation between obstacles, and takes the dynamic properties of the robot into account. Numerous variants had been proposed for this approach, most of them are using an objective function consisting of weighted terms. The solution named Global Dynamic Window Approach with Receding Horizon Control (GDWA/RHC) uses a global navigation function - which is a scalar-valued function representing the distance from the goal point - as the objective function. In this paper, a real-world implementation of the DWA and the GDWA/RHC methods is introduced. © 2013 IEEE.

关键词： Air navigation

来源：评论

学校读者我要写书评

暂无评论

Graph partitioning algorithm for model transformation frameworks

Graph partitioning algorithm for model transformation framew...

引用

IEEE EuroCon 2013

作者： Deak, László Mezei, Gergely Vajk, Tamás Fekete, Krisztián Department of Automation and Applied Informatics Budapest University of Technology and Economics Magyar tudósok krt. 2. Q Budapest 1117 Hungary

ISBN: (纸本)9781467322324

Software modeling has become an everyday practice. Modeling extra-large models have enormous constraints: both memory and computational capacity of a single computer might be insufficient for handling model transformations. One solution to overcome this barrier is to extend the infrastructure. Cloud computing provides feasible realizations for these needs. However, existing algorithms have to be extended/modified to support cloud computing and use its advantages most efficiently. Generally, models can be easily mapped to graphs. This paper provides an algorithm for partitioning graphs representing models. Models can be mapped onto several computational instances and processed on these instances in a distributed fashion. Our algorithm is based on the heuristic Kernighan-Lin method, but we allow manually altering the number of partitions dynamically based on the actual needs. Moreover, we do not build on knowing the entire model when creating the partitions, since it would not fit into the memory of a single instance. Instead, model nodes are received and processed one by one. Our algorithm is fine tuned to these special conditions. The efficiency of the algorithm is illustrated by a case study. © 2013 IEEE.

关键词： Cloud computing

来源：评论

学校读者我要写书评

暂无评论

Graph partitioning algorithm for social network model transformation frameworks

Graph partitioning algorithm for social network model transf...

引用

8th International Joint conference on Software Technologies, ICSOFT 2013

作者： Mezei, Gergely Deák, László Fekete, Krisztián Vajk, Tamás Department of Automation and Applied Informatics Budapest University of Technology and Economics Magyar tudósok krt. 2. Q Budapest 1117 Hungary

ISBN: (纸本)9789898565686

Dealing with extra-large models in software modeling is getting more and more common. In these cases, both memory and computational capacity of a single computer might be insufficient. A solution to overcome this barrier is to use cloud computing. However, existing algorithms have to be extended/modified to support cloud computing and use the advantages of its architecture efficiently. We focus on creating an algorithm to partition graphs representing models. Based on the algorithm, models should be able to be mapped onto several computational instances and processed in a distributed fashion efficiently. Previously, we have presented an algorithm that was based on the heuristic Kernighan-Lin partitioning method with two extensions: no limit on the number of partitions and not building on the knowledge of the whole model at beginning (nodes are received and processed one by one). However, when applying social network-based case studies, we have identified weaknesses of the algorithm. This paper elaborates an enhanced algorithm that produces better results for extra-large models. Detailed measurements are also presented in order to show the improvement. Copyright © 2013 SCITEPRESS.

关键词： Cloud computing

来源：评论

学校读者我要写书评

暂无评论

Predicting availability of mobile peers in large peer-to-peer networks

Predicting availability of mobile peers in large peer-to-pee...

引用

2013 IEEE 3rd Eastern European Regional Conference on the Engineering of Computer Based Systems, ECBS-EERC 2013

作者： Sipos, Márton Ákos Ekler, Péter Department of Automation and Applied Informatics Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Magyar Tudósok körútja 2 1117 Budapest Hungary

ISBN: (纸本)9780769550640

Peer-to-peer (P2P) applications for mobile devices are becoming more and more popular because of increasing bandwidth, computational performance and storage capabilities. Such a mobile based distributed architecture offers significant advantages in several scenarios from the perspective of both users and network operators. In these situations, a certain redundancy must be built into the system because the availability of the nodes can vary greatly. The goal of this paper is to present a methodology to minimize the necessary redundancy by predicting the number of available nodes. The prediction is performed in two steps, first an estimation is done locally at the node level, then a centralized aggregation is executed. We propose a hypothesis which highlights the key advantages of our solution when compared to single step estimation. Finally we discuss about the correctness of the computed redundancy. © 2013 IEEE.

关键词： Redundancy

来源：评论

学校读者我要写书评

暂无评论

The analysis of BitTorrent protocol reliability in modern mobile environment

The analysis of BitTorrent protocol reliability in modern mo...

引用

2013 IEEE 3rd Eastern European Regional Conference on the Engineering of Computer Based Systems, ECBS-EERC 2013

作者： Bori, András Ekler, Péter Department of Automation and Applied Informatics Faculty of Electrical Engineering and Informatics Budapest University of Technology and Economics Magyar Tudósok körútja 2 1117 Budapest Hungary

ISBN: (纸本)9780769550640

Nowadays BitTorrent is a popular peer-to-peer file sharing protocol. Thanks to the advancement and prevalence of smart phones the usage of the protocol is increasing, since mobile devices are capable of joining BitTorrent swarms as well. The key of the protocol is to distribute content between peers therefore it is very important that peers have reliable network connections and provide the correct content. In this paper we analyze the reliability of BitTorrent protocol in mobile environment by observing the availability rate of peers and the poisoning phenomenon in the system. For this research we have collected anonymous statistics retrieved by clients using DrTorrent. DrTorrent is a BitTorrent client that we have implemented on the Android platform. It was published on Google Play Store almost half a year ago and we have collected many experiences since then. In this research we introduce statistics and real measurements about DrTorrent and highlight the key points and relationships. This work can be considered as a pioneer work in the field of modern smart phone peer-to-peer research. © 2013 IEEE.

关键词： Smartphones

来源：评论

学校读者我要写书评

暂无评论

Sensitivity analysis of the weighted generalized mean aggregation operator and its application to fuzzy signatures

Sensitivity analysis of the weighted generalized mean aggreg...

引用

IEEE International Conference on Fuzzy Systems (FUZZ-IEEE)

作者： István Á. Harmati Ádám Bukovics László T. Kóczy Department of Mathematics and Computational Sciences Széchenyi István University Gyór Hungary Department of Structural and Geotechnical Engineering Széchenyi István University Gyór Hungary Department of Automation Széchenyi István University Gyór Hungary Department of Telecommunications and Media Informatics Budapest University of Technology and Economics Budapest Hungary

In this paper we give bounds on the changing of the weighted generalized mean in terms of vector norms of the changing of the variables. Applying this result we characterize the sensitivity of fuzzy signatures which equipped with weighted generalized mean operators in their nodes. Finally, a practical example from civil engineering is also examined.

关键词： Vectors Sensitivity analysis Educational institutions Estimation Civil engineering Fuzzy sets

来源：评论

学校读者我要写书评

暂无评论

Recalibrating fine-grained locking in parallel bucket hash tables

Recalibrating fine-grained locking in parallel bucket hash t...

引用

3rd Conference on Facing the Multicore-Challenge

作者： Dudás, Ákos Juhász, Sándor Kolumbán, Sándor Department of Automation and Applied Informatics Budapest University of Technology and Economics Magyar Tudósok krt. 2 QB207 1117 Budapest Hungary

ISBN: (纸本)9783642358920

Mutual exclusion protects data structures in parallel environments in order to preserve data integrity. A lock being held effectively blocks the execution of all other threads wanting to access the same shared resource until the lock is released. This blocking behavior reduces the level of parallelism causing performance loss. Fine grained locking reduces the contention for the locks resulting in better throughput, however, the granularity, i.e. how many locks to use, is not straightforward. In large bucket hash tables, the best approach is to divide the table into blocks, each containing one or more buckets, and locking these blocks independently. The size of the block, for optimal performance, depends on the time spent within the critical sections, which depends on the table's internal properties, and the arrival intensity of the queries. A queuing model is presented capturing this behavior, and an adaptive algorithm is presented fine-tuning the granularity of locking (the block size) to adapt to the execution environment. © 2013 Springer-Verlag Berlin Heidelberg.

关键词： Adaptive algorithms

来源：评论

学校读者我要写书评

暂无评论

FPGA-Based Real-Time Simulation of Renewable Energy Source Power Converters

引用

Journal of Energy and Power Engineering 2013年第1期7卷 168-177页

作者： Tamais Kokenyesi Istvan Varjasi Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest 1117 Hungary

Developing the control of modem power converters is a very expensive and time-consuming task. Time to market can take unacceptable long. FPGA-based real-time simulation of a power stage with analog measured signals can reduce significantly the cost and time of testing a product. This new approach is known as HIL （hardware-in-the-loop） testing. A general power converter consists of two main parts： a power level （main circuit） and a digital controller unit, which is usually realized by using some kind of DSP. Testing the controller HW and SW is quite problematic： live tests with a completely assembled converter can be dangerous and expensive. A low-power model of the main circuit can be built under laboratory conditions, but it will have parameters （e.g. time constants and relative losses） differing from the ones of the original system. The solution is the HIL simulation of the main circuit. With this method the simulator can be completely transparent for the controller unit, unlike other computer based simulation methods The subject of this paper is to develop such a real-time simulator using FPGA. The modeled circuit is a three-phase inverter, which is widely used in power converters of renewable energy sources.

关键词： HIL real-time simulation FPGA three-phase inverter solar converters.

来源：评论

学校读者我要写书评

暂无评论

Dynamic fuzzy rule weight optimization for a Fuzzy Based Single-Stroke Character Recognizer

Dynamic fuzzy rule weight optimization for a Fuzzy Based Sin...

引用

17th IEEE International Conference on Intelligent Engineering Systems, INES 2013

作者： Tormasi, Alex Koczy, Laszlo T. Széchenyi István University Department of Automation Gyor Hungary Budapest University of Technology and Economics Department of Telecommunications and Media Informatics Budapest Hungary

ISBN: (纸本)9781479908288

In this paper a dynamic fuzzy rule weighting method (DFW) combined with evolutionary optimization are presented for the formerly published Fuzzy Based Single-Stroke Character Recognizer (FUBAR) method. With the introduced rule weighting technique the consequent parts of the if...then... rules are calculated similarly to the original FUBAR method, but a dynamic fuzzy rule weight Wn([0,1]) described as a fuzzy set is applied to it in O n·1/Wn(On) form, where On is the output of the rule. The membership functions of DFW-s are determined by bacterial evolutionary algorithm. The paper compares the results of the proposed new algorithm with other (formerly published) FUBAR algorithms and also with other commercial and academic single-stroke recognizers in terms of recognition accuracy and computational resources needed. © 2013 IEEE.

关键词： Membership functions

来源：评论

学校读者我要写书评

暂无评论

Experiences with Basic Control Course Supported by MATLAB/SIMULINK Exercises

引用

IFAC Proceedings Volumes 2013年第17期46卷 309-314页

作者： Enikő Kósäné Kalave Istvän Bézi Ruth Bars Institute of Physics University of Debrecen Debrecen Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics Budapest Hungary Department of Automation and Applied Informatics Budapest University of Technology and Economics MTA-BME Control Engineering Research Group Budapest Hungary

A basic control course is taught for electrical engineering students at the university of Debrecen, Hungary. Through two semesters the students get a basic knowledge on control concepts. Every week there are 2 hours of theoretical lectures immediately followed by 2 hours of MATLAB based interactive computer laboratories. In the curriculum besides the conventional material new aspects of control design such as Youla parametrization have also been included. Practical considerations as e.g. controller saturation are also dealt with. The paper reviews briefly the curriculum and the educational process of this program.

关键词： control education matlab control exercises course curriculum Youla parametrization integrator windup

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：