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11th International Conference on computer systems and Technologies, CompSysTech'10

作者： Ilarionov, Raycho Simeonov, Ivan Kilifarev, Hristo Yordanov, Stanimir Shopov, Nikolay Ibrishimov, Hristo Department of Computer Systems and Technologies Technical University of Gabrovo Bulgaria Department of Automation Information and Control Systems Technical University of Gabrovo Bulgaria Department of Computer Systems and Technologies University of Food Technologies - Plovdiv Bulgaria Center for Information Systems and Technologies Technical University of Gabrovo Bulgaria

ISBN: (纸本)9781450302432

In this paper is described the design and implementation of a device for non-contact ultrasonic studying of materials. Presented is a scheme solution of the device, into which are provided several key features for work with purpose for greater versatility. There are presented block diagrams of algorithms of the software necessary for some modes of work of the device with microcontroller PIC16F84A. These modes are related to the way for excitation of the ultrasonic transmitter and the synchronization of measurement. The principle of work of the system is described in details. Copyright © 2010 ACM.

关键词： ultrasonic ultrasonic sensors non-contact method PIC16F84A

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System for non-contact ultrasonic study of mediums and materials intended for embedding into automated manufacturing systems 10

System for non-contact ultrasonic study of mediums and mater...

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11th International Conference on computer systems and Technologies, CompSysTech'10

作者： Yordanov, Stanimir Ilarionov, Raycho Simeonov, Ivan Kilifarev, Hristo Shopov, Nikolay Ibrishimov, Hristo Department of Automation Information and Control Systems Technical University of Gabrovo Bulgaria Department of Computer Systems and Technologies Technical University of Gabrovo Bulgaria Department of Computer Systems and Technologies University of Food Technologies Plovdiv Bulgaria Center for Information Systems and Technologys Technical University of Gabrovo Bulgaria

ISBN: (纸本)9781450302432

The main feature of ultrasound waves is their high frequency, allowing to be broadcast in the form of a narrow beam of rays and their distribution to be examined by the methods of geometrical optics. This allows ultrasound to be used for scientific and applied research. By the nature of distribution and absorption in gases, liquids and solids can be obtained valuable information about the structure and properties of substances. This article examines the use of hardware-software system designed for noncontact ultrasonic study of mediums and materials. Copyright © 2010 ACM.

关键词： Microprogramming

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Exploiting Multiple Paths in Multi-hop Co-operative Ad-Hoc Networks for Providing Security without Trusted Third Party 33rd

Exploiting Multiple Paths in Multi-hop Co-operative Ad-Hoc N...

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33rd International Conference on Advanced information Networking and Applications, AINA-2019

作者： Dinesh Ram Kumar, T. Bhatia, Ashutosh Hansdah, R.C. Department of Computer Science and Information Systems Birla Institute of Technology and Science Pilani India Department of Computer Science and Automation Indian Institute of Science Bangalore India

ISBN: (纸本)9783030150310

Ensuring secure communication in large scale wireless networks is a challenging issue, especially when the nodes participating in the network itself cannot be trusted fully. This situation is very much pertinent in the case of multi-hop wireless cooperative networks, where the nodes co-operate with each other to support multi-hop communication in the network. In such networks, assuming the presence of a trusted third party to provide key exchange and authentication services in the network is not viable. Additionally, the classical Diffie-Hellman based key establishment mechanism as such cannot be used because of Man-In-The-Middle and impersonation attacks, as the nodes participating in a multi-hop path from source to destination cannot be trusted. In this paper, we investigate the use of the multi-paths and secret sharing in multi-hop cooperative adhoc networks to provide practical secure communication between the nodes in the network. We propose a couple of routing algorithms that give multiple-paths to send different segments of information required to be communicated securely, under various behavioral models of the participating nodes. The simulation results show that the majority of times, we are able to find the multiple paths in the network through which the different segments of a piece of information can be sent to achieve desirable security. © 2020, Springer Nature Switzerland AG.

关键词： Secure communication

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Real time monitoring of packet loss in software defined networks 1st

Real time monitoring of packet loss in software defined netw...

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1st International Conference on Ubiquitous Communications and Network Computing, UBICNET 2017

作者： Sinha, Yash Vashishth, Shikhar Haribabu, K. Department of Computer Science and Information Systems BITS Pilani Pilani Campus Pilani India Department of Computer Science and Automation Indian Institute of Science Bangalore India

ISBN: (纸本)9783319734224

In order to meet QoS demands from customers, currently, ISPs over-provision capacity. Networks need to continuously monitor performance metrics, such as bandwidth, packet loss etc., in order to quickly adapt forwarding rules in response to changes in the workload. The packet loss metric is also required by network administrators and ISPs to identify clusters in network that are vulnerable to congestion. However, the existing solutions either require special instrumentation of the network or impose significant measurement overhead. Software-Defined Networking (SDN), an emerging paradigm in networking advocates separation of the data plane and the control plane, separating the network’s control logic from the underlying routers and switches, leaving a logically centralized software program to control the behavior of the entire network, and introducing network programmability. Further, OpenFlow allows to implement fine-grained Traffic Engineering (TE) and provides flexibility to determine and enforce end-to-end QoS parameters. In this paper, we present an approach for monitoring and measuring online per-flow as well as per-port packet loss statistics in SDN. The controller polls all the switches of the network periodically for port and flow statistics via OpenFlow 1.3 multipart messages. The OpenFlow compliant switches send cumulative statistics of sent and received packets to the controller that includes raw packets (control, non-user generated packets responsible for network management);which, although not being part of the end-to-end data traffic, get counted and act as noise in the statistics. The proposed method takes into account the effect of raw packets and thus, hamper the accuracy of methods. Other implementations propose approaches for per-flow packet loss only. We also take into account the effect of raw packets (control, non-user generated packets) which makes our packet loss estimation more accurate than other implementations. We also present a study of e

关键词： Quality of service

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Estimation of raw packets in SDN 1st

Estimation of raw packets in SDN

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1st International Conference on Ubiquitous Communications and Network Computing, UBICNET 2017

ISBN: (纸本)9783319734224

In SDN based networks, for network management such as monitoring, performance tuning, enforcing security, configurations, calculating QoS metrics etc. a certain fraction of traffic is responsible. It consists of packets for many network protocols such as DHCP, MLD, MDNS, NDP etc. Most of the time these packets are created and absorbed at midway switches. We refer to these as raw packets. Cumulative statistics of sent and received traffic is sent to the controller by OpenFlow compliant switches that includes these raw packets. Although, not part of the data traffic these packets get counted and leads to noise in the measured statistics and thus, hamper the accuracy of methods that depend on these statistics such as calculation of QoS metrics. In this paper, we propose a method to estimate the fraction of the network traffic that consists of raw packets in Software Defined Networks. The number of raw packets transferred depends on the number of switches and hosts in the network and it is a periodic function of time. Through experiments on several network topologies, we have estimated a way to find a cap on the generated raw packets in the network, using spanning tree information about the topology. © 2018, ICST Institute for computer Sciences, Social Informatics and Telecommunications Engineering.

关键词： Packet networks

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Ontological Aspects of Developing Robust Control systems for Technological Objects

Ontological Aspects of Developing Robust Control Systems for...

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3rd International Conference on Intelligent Computing and Optimization, ICO 2020

作者： Lutskaya, Nataliia Vlasenko, Lidiia Zaiets, Nataliia Shtepa, Volodimir Automation and Computer Technologies of Management Systems Automation and Computer Systems National University of Food Technologies Kiev Ukraine Department of Higher Mathematics and Information Technology Polessky State University Pinsk Belarus

ISBN: (纸本)9783030681531

The ontological aspects of designing the efficient control systems of technological objects, which are operating in uncertain environment have been demonstrated in the research work. Design and monitoring of the control system have been outlined as the two basic tasks on the basis of the covered subject and problem domain of the research as well as the life cycle of the system. The subject domain, which consists of the ontology of objects and processes, has been described with the use of the system and ontological approach. The peculiarity of the developed ontological system lies in the knowledge on the uncertainty of technological objects and the conditions of their operation. The ontological system, which underlies the further development of an intelligent decision support system, has been formed alongside with the ontology of objectives. The advantage of the ontology based design lies in the scientific novelty of the knowledge presentation model and the practical relevance for designers, developers, and researchers of the control systems for technological objects operating in uncertain environment. © 2021, The Author(s), under exclusive license to Springer Nature Switzerland AG.

关键词： Ontology

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Formation control with obstacle avoidance of second-order multi-agent systems under directed communication topology

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Science China(information Sciences) 2019年第9期62卷 144-157页

作者： Guoxing WEN C.L.Philip CHEN Hui DOU Hongli YANG Chunfang LIU College of Science Binzhou University Department of Computer and Information Science Faculty of Science and Technology University of Macau College of Navigation Dalian Maritime University State Key Laboratory of Management and Control for Complex Systems Institute of AutomationChinese Academy of Sciences Mathematics and Systems Science College Shandong University of Science and Technology

This paper addresses the obstacle avoidance problem of formation control for the multi-agent systems modeled by double integrator dynamics under a directed interconnection topology. The control task is finished by a leader-follower formation scheme combined with an artificial potential field(APF) *** leader-follower scheme is carried out by taking the desired trajectory with the desired velocity as virtual leader, while the APF method is carried out by dealing with the obstacles as the high potential points. When the obstacle avoidance tasks are finished, the artificial potential forces degrade the formation performance, so their undesired effects are treated as disturbances, which is analyzed by the robust H∞performance. Based on Lyapunov stability theory, it is proved that the proposed formation approach can realize the control objective. The result is also extended to the switching multi-agent formation. The effectiveness of the proposed formation scheme is further confirmed by simulation studies.

关键词： formation control obstacle avoidance artificial potential field method H_∞ performance second-order multi-agent system directed topology

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Non-contact ultrasound method for identification of yogurt according to its butter content 09

Non-contact ultrasound method for identification of yogurt a...

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International Conference on computer systems and Technologies and Workshop for PhD Students in Computing, CompSysTech'09

作者： Shopov, Nikolay Ilarionov, Raycho Simeonov, Ivan Kilifarev, Hristo Department of Automatics Information and Control Technique University of Food Technologies Plovdiv Bulgaria Department of Computer Systems and Technologies Technical University of Gabrovo Bulgaria Department of Automation Information and Control Systems Technical University of Gabrovo Bulgaria

ISBN: (纸本)9781605589862

In the current paper is proposed an approach for identification of yogurt according to its butter content, based on the methods for recognition of images with receiving of initial information by ultrasound. There are results presented from the made research regarding the ability for synthesis of symptoms for classification by means of discrete wavelet transformation. Classifiers are synthesized with the method "K-nearest-neighbors" (KNN) and are tested with independent control sample. It is realized a classification of yogurt with butter content 1, 2, 3, 3.6 and 5% with accuracy above 94%. © 2009 ACM.

关键词： Nearest neighbor search

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Formation of attribute spaces using wavelets in automatic classification of explosives 08

Formation of attribute spaces using wavelets in automatic cl...

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9th International Conference on computer systems and Technologies and Workshop for PhD Students in Computing, CompSysTech'08

作者： Shopov, Nikolai Ilarionov, Rajcho Simeonov, Ivan Kilifarev, Hristo Department of Automatics Information and Control Technique University of Food Technologies-Plovdiv Bulgaria Department of Computer Systems and Technologies Technical University of Gabrovo Bulgaria Department of Automation Information and Control Systems Technical University of Gabrovo Bulgaria

ISBN: (纸本)9789549641523

The non-contact automatic on-line classification of explosives is a multi-aspect task. It involves choosing the method of information gathering, planning and conduction of experiments, choosing a classifier, formation of training and control samples, synthesis and reduction of recognition attributes, etc. This paper presents the results of conducted experiments for non-contact ultrasonic information gathering, formation of attribute spaces by means of wavelet transformations and an automatic classification of explosives.

关键词： Wavelet transforms

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Single voice command recognition by finite element analysis 13

Single voice command recognition by finite element analysis

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13th International Conference on information Technology Based Higher Education and Training, ITHET 2014

作者： Todorov, T.D. Tsanev, G.S. Yordanov, S.Y. Department of Mathematics Technical University Gabrovo Bulgaria Department of Computer Systems and Technology Technical University Gabrovo Bulgaria Department of Automation Information and Control Systems Technical University Gabrovo Bulgaria

ISBN: (纸本)9781467367301

The paper deals with voice recognition systems. A new finite element signal processing method is obtained. Each input signal is processed by a particular frequency. Most authors analyse the cepstral coefficients in their classifiers. The logarithmic energy vector is used for recognising the input signal in the present paper. A new finite element criteria for closeness between voice commands and preliminary stored patterns is introduced. For this purpose a new Quasi-Hermite interpolation operator is obtained. The new ideas are computer implemented. Real life tests supporting the considered theory have been carried out. © 2014 IEEE.

关键词： Finite element method

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