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IEEE Global Communications Conference

作者： Leila Charabi Nawel Gharbi Jalel Ben-Othman Lynda Mokdad National Computer science Engineering School ESI Algiers Dep. of Computer Science University of Sciences and Technology USTHB Dep. of Computer Science L2TI laboratory University of Paris 13 LACL Laboratory University of Paris-Est Creteil

ISBN: (纸本)9781509013296

Recent trends in mobile cellular networks turn towards dep.oyment of Small Cell Networks (SCNs), where the cell size gets smaller and thus the number of subscribers served in a cell will be relatively smaller and should be considered finite. However, almost works on cellular mobile networks consider an infinite population cell, resulting commonly in infinite queueing models, for which no analytical solution is available for performance measures and only numerical approximations can be obtained. In this paper, a Call Admission Control (CAC) in a finite population micro-cell operating in a SCN, with retrials of blocked new calls, impatience of subscribers and multiple guard channels dedicated to handoff calls, is proposed. For the numerical computation of the steady-state probabilities of the corresponding continuous time Markov chain (CTMC), an efficient algorithm giving automatically the infinitesimal generator is developed, and various performance measures are established in network parameters and stationary probabilities. The guard channels number and retrials effect on the network performance in terms of blocking probability (for new calls and retrials) and dropping probability (of handoffs) is also carried out via experimental results.

关键词： Sociology Statistics Biological system modeling Analytical models computer architecture Microprocessors Numerical models

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The effects of machining strategies of magnetic assisted roller burnishing on the resulted surface structure

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IOP Conference Series: Materials science and engineering 2018年第1期448卷

作者： Zsolt Kovács Zsolt János Viharos János Kodácsy John von Neumann University GAMF Faculty of Engineering and Computer Science Dep. of Vehicle Technology Kecskemét H-6000 Hungary Department of Manufacturing Science and Technology Budapest University of Technology and Economics Budapest H-1111 Hungary Institute for Computer Science and Control of the Hungarian Academy of Sciences Kende u. 13-17 Budapest H-1111 Hungary John von Neumann University Faculty of Economics and Business Department of Economics and Law Kecskemét H-6000 Hungary

The aim of this paper is to investigate the effect of different burnishing strategy on a C45 steel machining. Burnishing is a well-known, cold working surface improving technology, it is usually applied for cylindrical workpiece. In the reported research a novel developed magnetic assisted ball burnishing (MABB) tool was applied which was designed for MABB machining of flat and harmonic surfaces. To increase its efficiency, different types of machining strategies were applied. After the burnishing process the machined surfaces were measured by surface roughness tester to determine the most important Rsk and Rku tribological parameters. According to the results it can be stated that all different burnishing strategies have special application areas where they can be used efficiently (e.g. sliding surface, moulding tool and after- or pre-machining for ultra-precision machining).

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A CMOS active delay line using injection-locking technique

A CMOS active delay line using injection-locking technique

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URSI Asia-Pacific Radio science Conference (URSI AP-RASC)

作者： Kang-Chun Peng Chan-Hung Lee Tai-Hsuan Tsai Dep. Computer and Communication Engineering National Kaohsiung First Univ. of Science and Technology Kaohsiung Taiwan Dep. RF Research aed Development Regatron Corporation Taipei Taiwan

ISBN: (纸本)9781467399838

This work develops a CMOS active delay line for microwave CW signals. The novel active delay line is mainly based on an injection-locking (IL) technique. The delay of the input signal is linear adjusted with various injection conditions. Comparing with conventional passive or active delay lines, the proposed active delay line has a wider delay tuning range and a higher gain. The implemented CMOS delay line achieves a wide operating range of 2 ~ 2.6 GHz with very wide delay tuning range from 45~220 ns. The power consumption is lower than 7.2 mW.

关键词： Delay lines Delays Meteorology Phase noise Meteorological radar Noise measurement

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Webcam-Based Tachometer for In-Field Induction Motor Load Estimation

Webcam-Based Tachometer for In-Field Induction Motor Load Es...

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International Conference on Electrical Machines

作者： Fernando J. T. E. Ferreira Fernando J. P. Lopes Institute of Systems and Robotics (ISR-UC) Department of Electrical and Computer Engineering University of Coimbra Dep. of Electrical Engineering Polytechnic Institute of Coimbra (IPC/ISEC)

ISBN: (纸本)9781509025398

Rotational speed measurement is a key issue in most industries, either for process control, characterization or fault diagnosis. In electric motor driven systems it can be used, for example, to estimate the motor load or pulley-belt transmission slip. Encoders and resolvers are typically used for continuous speed monitoring, requiring mechanical coupling with the rotating shaft/part. If the speed is to be measured at a given instant or during a few moments, noninvasive contactless optical tachometers can be used, using optical reflection or stroboscopic principles. In most cases, stroboscopic tachometers require no reflective elements/strips in the rotating part. However, if the user wants to continuously measure the speed of a given rotating part during the audit/characterization period, with real-time data logging and without sticking reflective strips or introducing shaft-coupled encoders/resolvers, there is no low-cost commercial solution to perform such task. For example, if the user's aim is to continuously estimate the load variation of an induction motor over a day or week, on the basis of the slip/speed value, it is not possible with conventional commercial low-cost contactless equipment, unless the user uses expensive online-operation equipment estimating the speed by means of input voltage/current. Moreover, in some rotating systems/parts not directly driven by an electric motor, the online equipment cannot be used and it is not practical, and in some cases even impossible, to couple an encoder/resolver or stick some reflective strips. In this paper, an innovative nonintrusive low-cost webcam-based tachometer is proposed, developed and experimentally tested. It can be used to easily estimate and record the speed over time in, for example, electrical motors, pulleys, shafts and wind turbines.

关键词： In-field speed measurement Motor speed Noninvasive speed measurement Rotational speed Tachometer Video camera Webcam Motor load estimation

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Wireless capsule technology: Remotely powered improved high-sensitive barometric endoradiosonde

Wireless capsule technology: Remotely powered improved high-...

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IEEE International Symposium on Circuits and systems (ISCAS)

作者： V. F. Annese C. Martin D. R. S. Cumming D. De Venuto Dep. of Electrical and Computer Science Engineering (DEI) Politecnico di Bari Bari Italy University of Glasgow School of Engineering Glasgow Scotland (UK)

ISBN: (纸本)9781479953424

In this paper an improved design of an RFID powered swallowable barometric endoradiosonde (ERS) is presented. The ERS consists of a micro fabricated capacitive sensor printed in gold on Polycaprolactone (PCL) on which a transponder chip design in 0.35μm AMS technology is in-plane bounded to the PCL substrate. The implantable or inside the body, transponder (tag) is powered by the external reader at 900MHz through inductively coupled antennas. The tag performs the capacitance to frequency conversion and transmits data back to the reader using load-shift keying (LSK) modulation. The ERS can measure the sensor output frequency with an INL error of 0.4%, sensitivity (Δf/ΔP) of -6.12MHz/kPa, occupies a volume of 1mm3 (transponder only), consumes, 400μW and 360μW for, respectively, dynamic and static power. The sensor has an accuracy of ± 0.1kPa, works in the pressure range of 0-1.99kPa (0-15mmHg). The readout circuit has a ±1.84kHz resolution.

关键词： Substrates Capacitors Erbium Data acquisition Modulation Capacitance Resists

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Smart World of Internet of Things (IoT) and Its Security Concerns

Smart World of Internet of Things (IoT) and Its Security Con...

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IEEE/ACM Int'l Conference on & Int'l Conference on Cyber, Physical and Social Computing (CPSCom) Green Computing and Communications (GreenCom)

作者： Jonathan Charity Talwana Huang Jian Hua East China University of Science and Technology Shanghai Shanghai CN Dep. of Computer Science and Information Engineering East China University of Science Technology Shanghai China

ISBN: (纸本)9781509058815

Due to increasing number of internet users, popularity of Broadband Internet also increasing. Hence the connection cost should be decrease due to Wi Fi connectivity and built-in sensors in devices as well the maximum number of devices should be connected through a common medium. To meet all these requirements, the technology so called Internet of Things is evolved. Internet of Things (IoT) can be considered as a connection of computing devices like smart phones, coffee maker, washing machines, wearable device with an internet. IoT create network and connect "things" and people together by creating relationship between either people-people, people-things or things-things. As the number of device connection is increased, it increases the Security risk. Security is the biggest issue for IoT at any companies across the globe. Furthermore, privacy and data sharing can again be considered as a security concern for IoT. Companies, those who use IoT technique, need to find a way to store, track, analyze and make sense of the large amounts of data that will be generated. Few security techniques of IoT are necessary to implement to protect your confidential and important data as well for device protection through some internet security threats.

关键词： Internet of Things Security Intelligent sensors Wireless communication Real-time systems

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Thermodynamic limit of interacting particle systems over dynamical networks

Thermodynamic limit of interacting particle systems over dyn...

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Asilomar Conference on Signals, systems & computers

作者： Augusto Almeida Santos Soummya Kar José M. F. Moura João Xavier Dep. of Electrical and Computer Engineering Carnegie Mellon University Pittsburgh PA USA Institute for Systems and Robotics Universidade de Lisboa Lisboa Portugal

ISBN: (纸本)9781538639559

The main result presented in this paper (whose proof can be found in [1]) is that the fraction of agents (Y̅ N k (t)) at state k ∈ X := {1, ..., K} associated with an interacting particle system over an appropriate dynamical communication network converges weakly to the solution of a differential equation. The vector macroprocess (Y̅ N (t)) = (Y̅ N 1 (t),..., Y̅ N k (t)) is not Markov since its evolution dep.nds not only on its current state, but on finer real-time microscopic high-dimensional information of the system - namely, the state of the N nodes X N (t) ∈ X N . Our result essentially states that under an appropriate dynamics of the underlying network of contacts, the macroprocess (Y̅ N (t)) becomes asymptotically (in N) Markov.

关键词： Microscopy Markov processes Convergence Artificial neural networks Probability Differential equations Peer-to-peer computing

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The ultimate IoT application: A cyber-physical system for ambient assisted living

The ultimate IoT application: A cyber-physical system for am...

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International Symposium on Circuits and systems

作者： D. De Venuto V. F. Annese A. L. Sangiovanni-Vincentelli Politecnico di Bari Dep. of Electrical and Computer Science Engineering (DEI) Bari Italy University of California at Berkeley Department of EECS US

ISBN: (纸本)9781479953424

We propose a novel approach that integrates wireless, non-invasive devices with fast, real-time algorithms for large data analysis and biofeedback reaction, to discern the voluntariness of human movement through direct sensing of brain potentials combined with muscular action signal monitoring. The system has been tested in real situations.

关键词： Fall Prevention EEG-EMG Remote Monitoring

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A New Categorization Numerical Scheme for Mobile Robotic Computing Using Odor Data-set Recognition as a Case

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Procedia computer science 2016年 94卷 199-206页

作者： Choukri Djellali Mehdi Adda Mathematics Computer Science and Engineering Dep. University of Quebec At Rimouski 300 Allée des Ursulines Rimouski QC G5L 3A1 Canada

Categorization is one of the most active research and application areas of Data Mining. In this paper, we address the problem of pattern categorization in mobile robotic computing. It is the task of automatically sorting a set of patterns into categories from a predefined set. Most categorization algorithms are sensitive to noise, architecture configuration, Bellman's curse of dimensionality, instability, and complex shapes. Hence, in the present study, a novel numerical scheme (RC) for pattern categorization which provides a good generalization ability with a small empirical error, is described. The experimental study with E-nose of six different MOX gas sensors is presented. Our evaluation method demonstrates the effectiveness and multidisciplinary applications of our approach.

关键词： Machine Learning Information Retrieval Pattern Recognition Categorization Features Selection Support Vector Machines

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A sound framework for dynamic prevention of Local File Inclusion 7

A sound framework for dynamic prevention of Local File Inclu...

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7th Conference on Information and Knowledge Technology, IKT 2015

作者： Tajbakhsh, Mir Saman Bagherzadeh, Jamshid Dep. of Electrical Engineering and Computer Science Urmia University Urmia Iran

ISBN: (纸本)9781467374859

Web applications take an important role in remote access over the Internet. These applications have many capabilities such as database access, file read/write, calculations as well as desktop applications but run in web browsers environments. As desktop applications, web applications can be exploited but with different techniques. One of the major known vulnerabilities of the web applications is Local File Inclusion. Inclusion in web applications is similar to library imports in desktop applications where a developer can include former developed codes. If an attacker includes his/her libraries, he/she can run his/her malicious code. Current research makes a brief survey of static and dynamic code analysis and suggests a framework for dynamically preventing malicious file inclusions by attackers. It is discussed that this framework prevents local file inclusions even if the developer has exploitable source code. The language PHP is used for describing the vulnerability and prevention framework. © 2015 IEEE.

关键词： Web browsers

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