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2013 International Conference on Electronic Engineering and computer Science(EECS 2013)

作者： Ayyoub Akbari-Moghanjoughi Aduwati Sali José Roberto Amazonas Burhanuddin Mohd Ali Shamala Subramaniam Sabira Khatun Department. of Computer & Communications Systems Engineerin Faculty of Engineering Universiti Putra Malaysia Department of Telecommunications and Control Engineering of Escola Politécnica of the University of S?o Paulo Department of Communication Technology & Networks Faculty of Computer Science and IT Universiti Putra Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis

In this paper a general architecture of tightly-coupled integrated LR-WPAN/Wi MAX network has been introduced by proposing and utilising a novel access router named Wireless Integrated Access Router(WIAR). The suggested access router effectively combines both Wi MAX and LR-WPAN technologies in a same device. The main motivation to propose this integration is to deploy Internet of Things(Io T) applications and services in wide area networks. Using Wi MAX as backhaul service, the Internet connection can be provided for dispersed mobile LR-WPAN users over a wide area. Moreover, it enables to access all collected data in the local LR-WPAN coverage area – which is named as Senspot in this paper – by third-party clients through the Internet. Furthermore, an analytic model has been developed for the integrated network to evaluate the system's performance. Theoretical results on blocking probability of new and handover calls from Wi MAX subscribers, as well as new connections from LR-WPAN Senspots in a cell of Wi MAX have been investigated in terms of call/connection rates and number of allocated channels.

关键词： Backhaul Support Heterogeneous Wireless Network IoT networks Integration WiMAX LR-WPAN

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Nonlinear analysis of dynamical complex networks 2014

Abstract and Applied Analysis

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Abstract and Applied Analysis 2014年第SI42期2014卷 1-4页

作者： Wang, Zidong Shen, Bo Dong, Hongli Hu, Jun He, Xiao Ding, Derui Department of Computer Science Brunel University Uxbridge Middlesex UB8 3PH United Kingdom Communication Systems and Networks (CSN) Research Group Faculty of Engineering King Abdulaziz University Jeddah 21589 Saudi Arabia School of Information Science and Technology Donghua University Shanghai 200051 China College of Electrical and Information Engineering Northeast Petroleum University Daqing 163318 China Research Institute of Intelligent Control and Systems Harbin Institute of Technology Harbin 150001 China Department of Applied Mathematics Harbin University of Science and Technology Harbin 150080 China Department of Automation Tsinghua University Beijing 100084 China Department of Applied Mathematics Anhui Polytechnic University Wuhu 241000 China

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Sliding mode control of a boost converter using a non linear sliding surface

Sliding mode control of a boost converter using a non linear...

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International Conference on systems and Control (ICSC)

作者： Yosra Massaoudi Tarak Damak Jean Paul Gaubert Driss Mehdi Communication Networks (ComNets) Faculty 6 RWTH Aachen University Germany Department of Electrical & Electronics Engineering Hacettepe University Turkey Department of Systems and Computer Engineering Carleton University Ottawa Ontario Canada

This paper presents a new form of a non linear sliding surface with “optimal” parameters in order to have a suitable sliding mode controller for a DC-DC boost converter. A comparison between the proposed sliding sur... 详细信息

关键词： Sliding mode control Mathematical model Integrated circuit modeling Optimization IEEE conference proceedings Conferences

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Verifying worst case delays in controller area network

Verifying worst case delays in controller area network

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16th International GI/ITG Conference on Measurement, Modelling and Evaluation of Computing systems and Dependability and Fault Tolerance, MMB and DFT 2012

作者： Ivkovic, Nikola Kresic, Dario Hielscher, Kai-Steffen German, Reinhard Department of Information Technologies and Computing Faculty of Organization and Informatics University of Zagreb Pavlinska 2 HR-42000 Varaždin Croatia Department of Computer Networks and Communication Systems University of Erlangen-Nuremberg Martensstraße 3 D-91058 Erlangen Germany

ISBN: (纸本)9783642285394

Controller Area Network (CAN) protocol was developed to fulfill high availability and timing demands in modern cars, but today it is also used in many other mission critical applications with hard real-time requirements. We present a compact model of the CAN bus specified by a timed automaton and prove its applicability for estimating worst case delays which are crucial for hard real-time systems. Using our model we detected flaws in previous approaches to determine the worst case delays in CAN systems. © 2012 Springer-Verlag.

关键词： Real time systems

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First Survey Results of Quantified User Behavior in User-in-the-Loop Scenarios for Sustainable Wireless networks

First Survey Results of Quantified User Behavior in User-in-...

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IEEE Vehicular Technology Conference

作者： Rainer Schoenen Gurhan Bulu Amir Mirtaheri Tamer Beitelmal Halim Yanikomeroglu Communication Networks (ComNets) Faculty 6 RWTH Aachen University Department of Electrical & Electronics Engineering Hacettepe University Department of Systems and Computer Engineering Carleton University

ISBN: (纸本)9781467318808

Traffic in mobile radio networks is expected to continue to increase by 100% per year. This imposes a big challenge for future generations (4G and 5G) of access technologies which were previously dimensioned for over-provisioning especially in the busy hours. Recent forecasts hint that this assumption and approach will not be tractable anymore. Instead the demand will exceed the supply more and more frequently causing congestion not only in short term but over longer periods of time. Any approach to engineer networks greener by better spectral efficiency only will fail to meet the global objective, if demand keeps on increasing faster than supply and efficiency. Instead, the User-in-the-loop approach allows to shape the demand where it originates either in space or time. This is achieved by incentives for users to change location or by dynamic tariffs to shift the use of congested resources out of the busy hours. This works as the smart grid of communications. While some work has already been done in this new field, the user behavior to the controlled demand shaping was based on assumptions. In this paper, the assumptions were confirmed by recent survey results which indicate that shaping user behavior works sufficiently well. Models of the user response are given and analysis and simulation results show the advantages and gains of this approach.

关键词： User-in-the-loop (UIL) IMT-Advanced LTE Relays Demand shaping Tariffs Spatial and temporal control Consumers mobile radio network Smart grids Wireless networks time periods communication Research

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In situ aberration measurement technique based on multi-illumination settings and principal component analysis of aerial images

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Chinese Optics Letters 2012年第12期10卷 35-38页

作者： A.W.Al-Alimi A.F.Abas M.A.Mahdi M.H.Al-Mansoori M.Mokhtar Wireless and Photonic Networks Research Centre Englneering and Technology ComplexUniversiti Putra Malaysia43400 SerdangSelangorMalaysia Photonics and Fiber Optic Systems Laboratory Department of Computer and Communication Systems Engineering Universiti Putra Malaysia43400 SerdangSelangorMalaysia Faculty of Engineering Sohar UniversityP.O Box 44 Sohar P.C.311Oman

A multiwavelength Brillouin/erbium fiber laser （BEFL） with low threshold power is realized. A low threshold power of 3 mW and a wide tuning range of 18 nm can be achieved by controlling the reflected power in the nonlinear optical loop mirror （NOLM）. Up to 24 lines with a wavelength spacing of 0,086 nm are generated at the Brillouin pump and at the 1 480-nm pump with -0.5 dBm （0.9 roW） and 25 mW of power, respectively.

关键词： 140.3510 Lasers, fiber 290.5900 Scattering, stimulated Brillouin 060.2410 Fibers, erbium

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Effect of Erbium Doped Fiber location on double spacing multi-wavelength Brillouin-Erbium fiber laser performance

Effect of Erbium Doped Fiber location on double spacing mult...

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International Conference on Photonics (ICP)

作者： B. A. Ahmad Gh. Mamdoohi A. F. Abas M. Mokhtar M. A. Mahdi Wireless and Photonic Networks Research Centre Engineering and Technology Complex Photonics Laboratory Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia

Two different locations of Erbium Doped Fiber (EDF) in dual ring configuration to generate double frequency shifted of multiwavelength Brillouin Erbium fiber laser (BEFL) have been investigated. The experimental results show that the location of EDF has important roles to determine the number of output Stoke signals and tuning range. Beside the Erbium gain, the Brillouin gain also contributes to the performance of BEFL. By putting the EDFA next to the BP, more Stokes lines with wider tuning range were obtained compare by putting the EDF next to the gain medium was observed.

关键词： Optical fiber sensors Erbium-doped fiber lasers Scattering Cavity resonators Laser theory Optical fiber amplifiers

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Quantified user behavior in user-in-the-loop spatially and demand controlled cellular systems

Quantified user behavior in user-in-the-loop spatially and d...

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European Wireless 2012;18th European Wireless Conference 2012

作者： Rainer Schoenen Gurhan Bulu Amir Mirtaheri Tamer Beitelmal Halim Yanikomeroglu Communication Networks (ComNets) Faculty 6 RWTH Aachen University Germany Department of Electrical & Electronics Engineering Hacettepe University Turkey Department of Systems and Computer Engineering Carleton University Ottawa Ontario Canada

User-centric services are a growing concern. While the digital society definitely needs better quality-of-experience (QoE) for the user, his applications on smart mobile devices will continue to raise traffic in mobile radio networks by 100% per annum. Future generations of access technologies are challenged by this and the old over provisioning approach will not hold anymore, especially during busy hours. Congestion will happen more and more often, leading to a much worse QoE for everyone involved. Increasing the supply side by better spectral efficiency of 5G radio networks cannot work on its own, if demand is increasing faster than supply.

关键词： Wireless communication Pricing Cellular phones Companies Europe Educational institutions Indexes

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Multiwavelength Brillouin erbium fiber laser in virtual linear cavity

Multiwavelength Brillouin erbium fiber laser in virtual line...

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International Conference on Photonics (ICP)

作者： A. W. Al-Alimi A. F. Abas M. A. Mahdi M. H. Al-Mansoori M. Mokhtar Wireless and Photonic Networks Research Centre Engineering and Technology Complex Photonics and Fiber Optic Systems Laboratory Department of Computer and Communication Systems Engineering Universiti Putra Malaysia Serdang Selangor Darul Ehsan Malaysia Faculty of Engineering Sohar University Sohar Oman

A multiple wavelength Brillouin/erbium fiber laser in a virtual linear cavity configuration is demonstrated. The virtual linear cavity is formed by utilizing a double pass amplification box at one end of the cavity, and a virtual mirror on the other end. The virtual mirror is created by the stimulated Brillouin scattering (SBS) effect in standard single mode fiber. The tunability limitation of conventional MWBEFLs is eliminated by using half mirrorless linear cavity technique. Due to the large amount of gain achieved by the double pass amplification box, 7 Stokes lines are achieved at pump power and Brillouin pump power of 130 mW And 0 dBm, respectively. Up to 4 channels can be freely tuned over a tuning range of 37.5 nm from 1530 nm 1567 nm.

关键词： Scattering Cavity resonators Erbium-doped fiber lasers Optical fiber amplifiers Laser excitation Laser tuning

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Carbon-Nanotube-Based FR-4 Patch Antenna as a Bio-Material Sensor

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Procedia Engineering 2012年 41卷 724-728页

作者： Ahmad Mohammadi Alyani Ismail Mohd Adzir Mahdi Raja Syamsul Azmir Raja Abdullah Maryam Mohd Isa Amir Reza Sadrolhosseini Department of Computer and Communication Systems Engineering Faculty of Engineering Universiti Putra Malaysia 43400 Selangor Malaysia Department of Electrical & Electronics Engineering Faculty of EngineeringUniversiti Putra Malaysia 43400 Selangor Malaysia Center of Excellence for Wireless and Photonics Networks (WiPNet) Faculty of Engineering Universiti Putra Malaysia 43400UPM Serdang Malaysia

This paper presents the development and design of proximity coupled feed patch antenna as a bio-sensor. This sensor system consists of a two-layer Flame Retardant (FR-4) patch antenna coated with Multi Walled Carbon Nanotubes (MWCNTs) for absorbing bio-molecules. The best design of patch antenna is chosen based on simulation results using computer Simulation Technology (CST) microwave studio software. After adding bio-material on the top of antenna and interaction with MWCNTs based on the changes in the effective dielectric constant, the resonant frequency of patch antenna is changed. Experimental results have shown 1 MHz change in resonant frequency of patch antenna upon exposure to ethanol. Based on operating frequency (5 GHz) this technique can be used in network sensor systems to measure bio-materials in future research.

关键词： Bio sensor patch antenna carbon nanotube sensor microwave sensor

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