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2017 International Conference on Management Engineering, Software Engineering and Service sciences, ICMSS 2017

作者： Rafailescu, Marius Petrescu, Mircea Stelian Faculty of Automatic Control and Computer Science POLITEHNICA University Bucharest Romania

ISBN: (纸本)9781450348348

Defining a protocol for commit consensus problem in distributed database transactions is not an easy task because we have to think about a fault tolerant system. In this paper, I present a fault tolerant and simple mechanism designed for solving commit consensus problem, based on replicated validation of messages sent between transaction participants. © 2017 ACM.

关键词： Fault tolerance

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Single trial ERP amplitudes reveal the time course of acquiring representations of novel faces in individual participants

arXiv

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arXiv 2020年

作者： Sommer, Werner Stapor, Katarzyna Kończak, Grzegorz Kotowski, Krzysztof Fabian, Piotr Ochab, Jeremi Bereś, Anna Ślusarczyk, Grażyna Humboldt-University at Berlin Department of Psychology Germany Silesian University of Technology Institute of Computer Science Gliwice Poland University of Economics in Katowice Department of Statistics Econometrics and Mathematics Poland Silesian University of Technology Department of Applied Informatics Gliwice Poland Silesian University of Technology Department of Algorithmics and Software Gliwice Poland Jagiellonian University Department of Theory of Complex Systems Krakow Poland Jagiellonian University Department of Cognitive Neuroscience and Neuroergonomics Krakow Poland Jagiellonian University Department of Design and Computer Graphics Krakow Poland Institut für Psychologie Humboldt-Universität zu Berlin Rudower Chaussee 18 Berlin12489 Germany Faculty of Automatic Control Electronics and Computer Science Department of Applied Informatics Silesian University of Technology Akademicka 16 Gliwice44-100 Poland

The neural correlates of face individuation – the acquisition of memory representations for novel faces – have been studied only in coarse detail and disregarding individual differences between learners. In their seminal study, (Tanaka, Curran, Porterfield, & Collins, 2006) required the identification of a particular novel face across 70 trials and found that the N250 component in the ERP became more negative from the first to the second half of the experiment, where it reached a similar amplitude as a well-known face. We were unable to directly replicate this finding in our study when we used the original spilt of trials. However, when we applied a different split of trials we observed very similar changes in N250 amplitude. Then, we developed and applied a new two-step explorative-confirmative non-parametric method based on permutation testing to determine the time course of face individuation in individual participants based on single trial N250 amplitudes. We show that the assumption of a steep initial increase of N250 amplitude across multiple presentations of the target face, followed by a plateau, yields plausible results in fitting linear trends for most participants. The transition point from initial acquisition to the plateau phase differed strongly between participants and tended to be earlier when performance in target face recognition was better. Hence, face individuation may be accounted for by a biphasic process of early, fast acquisition, followed by a slower, asymptotic consolidation or maintenance phase. The current approach might be fruitfully applied to further investigations into face individuation and their neural correlates. © 2020, CC BY-NC-ND.

关键词： Face recognition

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A note on the stability analysis of a class of nonlinear systems - An LMI approach

UPB Scientific Bulletin, Series C: Electrical Engineering an...

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UPB Scientific Bulletin, Series C: Electrical Engineering and computer science 2018年第4期80卷 3-10页

作者： Olteanu, Mircea Ştefan, Radu Department of Mathematical Methods and Models Faculty of Applied Sciences University "Politehnica" of Bucharest Romania Department of Automatic Control and Systems Engineering Faculty of Automatic Control and Computer Science University "Politehnica" of Bucharest Romania

The main goal of the paper is to study the equilibria of a nonlinear system, proving the existence and uniqueness of an equilibrium point in the positive ortant. We also provide numerically tractable conditions (by using Linear Matrix Inequalities techniques) to check the asymptotic stability of the equilibrium point. An illustrative numerical example is closing the paper along with some conclusions. © 2018, Politechnica University of Bucharest. All rights reserved.

关键词： Nonlinear systems

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Heat distribution in the deep drawing device components working by high temperatures 10

Heat distribution in the deep drawing device components work...

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10th International Conference Machine and Industrial Design in Mechanical Engineering, KOD 2018

作者： Tropp, M. Brumerčík, F. Šteininger, J. Weis, P. Glowacz, A. Univerzity of Žilina Faculty of Mechanical Engineering Department of Design and Mechanical Elements Univerzitná 1 Žilina010 26 Slovakia AGHUniversity of Science and Technology Faculty of Electrical Engineering Automatics Computer Science and Biomedical Engineering Department of Automatic Control and Robotics Al. A. Mickiewicza 30 Kraków30-059 Poland

The subject of the article is a simulation of heat affected components of a device for deep drawing by extreme conditions in vacuum by high temperatures required for forming of crystallization containers made from thin molybdenum sheets. The simulation is focused on the distribution of heat in particular components in relation with their shape. There are presented the design of working components and the boundary conditions of transient thermal simulations with the results. © 2018 Institute of Physics Publishing. All rights reserved.

关键词： Deep drawing

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The mapping between TFD and IEEE 802.11 user priorities and access categories 32nd

The mapping between TFD and IEEE 802.11 user priorities and ...

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32nd International Symposium on computer and Information sciences, ISCIS 2018 Held at the 24th IFIP World computer Congress, WCC 2018

作者： Chodorek, Robert R. Chodorek, Agnieszka Department of Telecommunications AGH University of Science and Technology Al. Mickiewicza 30 Krakow30-059 Poland Faculty of Electrical Engineering Automatic Control and Computer Science Kielce University of Technology Al. Tysiaclecia P.P. 7 Kielce25-314 Poland

ISBN: (纸本)9783030008390

The modern approach to the quality of service (QoS) claims that problems of assurance of the required QoS parameters may occur not only in core networks (as the classic approach assumes), but also in access networks (including local networks, or LANs), especially if the access network is of broadcast type, such as the IEEE 802.11 wireless LAN. In the case of broadcast LANs, QoS assurance in the network layer should be associated with the QoS assurance in the data link layer. The aim of this paper is to propose such an association between the 802.11 QoS assurance and the QoS assurance based on the Traffic Flow Description (TFD) option of the IP protocol. The TFD was specified by the Authors in the IETF’s working document (Internet Draft), and was intended to describe Internet traffic for the purpose of dynamic resource reservations. The TFD-based QoS assurance offers dynamic reservations for micro-flows (single data real-time streams or non-real-time flows). The proposed method associates TFD and 802.11 QoS architectures in a way similar to the association of the DiffServ architecture and the 802.11 QoS, i.e. by the mapping of corresponding signalling. This mapping was designed and then implemented by the Authors in a Linux kernel. Results of laboratory experiments carried out in a test network show that the proposed mappings sufficiently promote traffic described by the TFD option in 802.11 WLAN and protect it against degradation. The proposed method includes the mapping of static signalling. Mapping of dynamic information conveyed in the TFD option is also possible and will be a subject of further research. The mapping between TFD and IEEE 802.11 user priorities and access categories will allow a 802.11 network to preserve TFD-based QoS in wireless links. © Springer Nature Switzerland AG 2018.

关键词： Quality of service

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LED Smart Illumination with DFID Indoor Positioning 21

LED Smart Illumination with DFID Indoor Positioning

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21st International Conference on control Systems and computer science, CSCS 2017

作者： Floarea, Dorian Sgarciu, Valentin Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Bucharest Romania

ISBN: (纸本)9781538618394

There are already plenty of Internet of Things (IoT) architectures and systems available worldwide and this creates challenges for software development and systems entities that use these platforms. Global visibility and interoperability through the exposure of these platforms via the web can be achieved through a new paradigm to support an open framework for Web of Things (WoT), which is analogous to web pages. Thus, real-world objects and cloud services could interact via the web. This paper presents the concept of an intelligent lighting system designed in an architectural style based on the Representational State Transfer (REST) web technology and provides intelligent illumination based on Radio-Frequency Identification (RFID) technology. © 2017 IEEE.

关键词： Web services

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Fuzzy Predictions Regarding In Vitro Behavior of Cells Line Under Cytostatic Treatment

Fuzzy Predictions Regarding In Vitro Behavior of Cells Line ...

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E-Health and Bioengineering Conference (EHB)

作者： M. Caramihai N. Radu M. Bostan G. Ion A. A. Chirvase M. Constantin M. Doni N. Babeanu Faculty of Automatic Control and Computer Science University POLITEHNICA of Bucharest Romania Biotechnology Department University of Agronomic Sciences and Veterinary Medicine of Bucharest Romania Immunology Center of IVN S. Nicolau Bucharest Romania Biotechnology Department National Institute of Chemistry and PetrochemistryR&D of Bucharest Romania

Behavior evaluation of tumor and normal cell lines, under the influence of mixture between cytostatic and immunomodulatory compounds represents a challenge in oncologic research, because it is expected that in the presence of immunomodulatory compound, the normal cells will be less affected and the tumor cells will be destroyed much more. The aim of this paper is to predict the behavior of tumor cell line (FaDu) and normal cell line (HUVEC) under the influence of cytostatic compound named Cisplatin (CisPt) and under the influence of immunomodulatory compound named Curcumin (CR), in order to obtain an optimal mixing ratio between these two compounds. Based on the results obtained in Lab regarding the response of the two cell lines evolution vs. the treatment with each reagent in the concentration range of (0-100μM/mL), it was tried to model the behavior of the system in presence of these two compounds, using a fuzzy prediction. The obtained results were compared with predictions resulted from fuzzy simulation. Analyzing the numeric values, the best results were obtained in the case of prediction regarding HUVEC behavior with a fuzzy simulation.

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Performance Analysis of a Cloud Computing System using Queuing Model with Correlated Task Reneging

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Journal of Physics: Conference Series 2021年第1期2091卷

作者： Rakesh Kumar Bhavneet Singh Soodan Godlove Suila Kuaban Piotr Czekalski Sapana Sharma School of Mathematics Shri Mata Vaishno Devi University Katra Jammu and Kashmir 182320 India Department of Mathematics and Statistics Namibia University of Science and Technology Private Bag 13388 Windhoek Namibia 13 Jackson Kaujeua Street Windhoek Namibia Institute of Theoretical and Applied Informatics Polish Academy of Sciences Baltycka 5 44-100 Gliwice Poland Department of Computer Graphics Vision and Digital Systems Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Department of Mathematics Cluster University of Jammu Jammu and Kashmir

Queuing theory has been extensively used in the modelling and performance analysis of cloud computing systems. The phenomenon of the task (or request) reneging, that is, the dropping of requests from the request queue often occur in cloud computing systems, and it is important to consider it when developing performance evaluations models for cloud computing infrastructures. Majority of studies in the performance evaluation of cloud computing data centres with the use of queuing theory do not consider the fact that the tasks could be removed from queue without being serviced. The removal of tasks from the queue could be due to the user impatience, execution deadline expiration, security reasons, or as an active queue management strategy. The reneging could be correlated in nature, that is, if a request is dropped (or reneged) at any time epoch, and then there is a probability that a request may or may not be dropped at the next time epoch. This kind of dropping (or reneging) of requests is referred to as correlated request reneging. In this paper we have modelled a cloud computing infrastructure with correlated request reneging using queuing theory. An M/M/1/N queuing model with correlated reneging has been used to study the performance analysis of the load balancing server of a cloud computing system. The steady-state as well as the transient performance analyses have been carried out. Important measures of performance like average queue size, average delay, probability of task blocking, and the probability of no waiting in the queue are studied. Finally, some comparisons are performed which describe the effect of correlated task reneging over simple exponential reneging.

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control of discrete-time nonlinear systems via finite-step control Lyapunov functions

arXiv

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arXiv 2019年

作者： Noroozi, Navid Geiselhart, Roman Grüne, Lars Wirth, Fabian R. Otto-von-Guericke University of Magdeburg Laboratory for Systems Theory and Automatic Control Magdeburg39106 Germany University of Ulm Institute of Measurement Control and Microtechnology Albert-Einstein-Allee 41 Ulm89081 Germany University of Bayreuth Mathematical Institute Universitätsstraße 30 Bayreuth95440 Germany University of Passau Faculty of Computer Science and Mathematics Innstraße 33 Passau94032 Germany

In this work, we establish different control design approaches for discrete-time systems, which build upon the notion of finite-step control Lyapunov functions (fs-CLFs). The design approaches are formulated as optimization problems and solved in a model predictive control (MPC) fashion. In particular, we establish contractive multi-step MPC with and without reoptimization and compare it to classic MPC. The idea behind these approaches is to use the fs-CLF as running cost. These new design approaches are particularly relevant in situations where information exchange between plant and controller cannot be ensured at all time instants. An example shows the different behavior of the proposed controller design approaches. Copyright © 2019, The Authors. All rights reserved.

关键词： Model predictive control

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Compressible Impulse Response Identification with MSE-controlled Orthogonal Greedy Algorithms

Compressible Impulse Response Identification with MSE-Contro...

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International Conference on Signals and Electronic Systems, ICSES

作者： Grzegorz Dziwoki Marcin Kucharczyk Jacek Izvdorczyk Bartłomiej Ulfik Institute of Electronics Silesian University of Technology Gliwice Poland Faculty of Automatic Control Electronics and Computer Science Silesian University of Technology Gliwice Poland

Sampled channel impulse response (CIR) of a sparse propagation environment usually has a structure of compressible signal, which can be approximated by a sparse one using compressive sensing methods like Orthogonal Greedy Algorithms (OGA). An accuracy of the estimated CIR taps depend on ambient noise and the CIR taps that have not been recovered yet. The Mean Square Error (MSE) is a popular measure to quantify the identification error between the estimated CIR and the actual one. A theoretical study of the MSE metric and some average properties of the OGA residual error have contributed to propose a MSE-based rule to control an iterative process of greedy methods. The conducted numerical experiments show that the suggested rule, applied to stop the Orthogonal Matching Pursuit (OMP) algorithm, provides a fine control over the identification process of the compressible CIRs.

关键词： Channel estimation Receivers Matching pursuit algorithms Estimation Training Approximation error Distortion

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