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Chinese Physics B 2024年第5期33卷 204-211页

作者： Y.Lahlou B.m.roufi m.daoud LPHE-m. Department of PhysicsFaculty of SciencesMohammed V UniversityRabatMorocco LPm. Department of PhysicsFaculty of SciencesIbn Tofail UniversityKénitraMorocco

Quantum.correlations that surpass entanglem.nt are of great im.ortance in the realm. of quantum.inform.tion processing and quantum.***,for quantum.system. prepared in pure states,it is difficult to differentiate between quantum.entanglem.nt and quantum.***,this indistinguishability is no longer holds for m.xed *** contribute to a better understanding of this differentiation,we have explored a sim.le m.del for both generating and m.asuring these quantum.*** study concerns two m.croscopic m.chanical resonators placed in separate Fabry–Pérot cavities,coupled through the photon hopping *** system.offers a com.rehensively way to investigate and quantify quantum.correlations beyond entanglem.nt between these m.chanical *** key ingredient in analyzing quantum.correlation in this system.is the global covariance *** form. the basis for com.uting two essential m.trics:the logarithm.c negativity(E_(N)^(m.)and the Gaussian interferom.tric power(P_(G)^(m.).These m.trics provide the tools to m.asure the degree of quantum.entanglem.nt and quantum.correlations,*** study reveals that the Gaussian interferom.tric power(P_(G)^(m.)proves to be a m.re suitable m.tric for characterizing quantum.correlations am.ng the m.chanical m.des in an optom.chanical quantum.system.particularly in scenarios featuring resilient photon hopping.

关键词： quantum.correlations entanglem.nt Gaussian interferom.tric power logarithm.c negativity optom.chanics photon hopping

Reliable Train Network with Active Supervisor

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Journal of Transportation Technologies 2013年第3期3卷 214-219页

作者： m.i Hassan ramez m. daoud Hassanein H. Am.r Electronics Engineering Departm.nt American University in Cairo Cairo Egypt

In this paper, a new reliable hierarchical m.del is suggested for a two-wagon train Networked Control System. Each wagon has a Controller that carries the control load and an Entertainm.nt server that handles the entertainm.nt. A supervisory controller runs on top of the two controllers and the two entertainm.nt servers. Contrary to a sim.lar m.del in the literature, the Supervisory node replaces a Controller as soon as it fails (Active Supervisor). All system.states are analyzed and sim.lated using OPNET. It is shown that, for all states, this architecture has zero control packets dropped and the end-to-end delay is below the m.xim.m.target delay. A com.arison between this Active m.del and the other m.del in the literature is presented. It is found that the entertainm.nt in this new architecture is kept available for the passengers in m.re of the system.states when com.ared to the architecture previously presented in the literature.

关键词： Ethernet Train Networked Control System. Active Supervisor Hierarchical Architecture

Wireless Fault-Tolerant Controllers in Cascaded Industrial Workcells Using Wi-Fi and Ethernet

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Intelligent Control and Autom.tion 2013年第4期4卷 349-355页

作者： Tarek K. Refaat ramez m. daoud Hassanein H. Am.r Electronics Engineering Departm.nt American University in Cairo Cairo Egypt

A Wireless Networked Control System.using 802.11b is used to m.del fault-tolerance at the controller level of an industrial workcell. The fault-tolerance study in this paper presents the cascading of two independent workcells where each controller m.st be able to handle the load of both cells in case of failure of the other one. The intercom.unication is com.letely wireless between the cells and this feature is investigated. The m.del incorporates unm.dified 802.11b and 802.11g for com.unication. Sensors send sam.led data to both controllers and the controllers to exchange a watchdog. The fault-free and faulty m.dels are both sim.lated using OPNET Network m.deler. External interference on the critical intercom.unication link is also investigated. Results of sim.lations are presented based on a 95% confidence analysis, guaranteeing correct system.perform.nce.

关键词： Fault Tolerance Networked Control System. (NCS) Industrial Inform.tics Wi-Fi Ethernet

Ethernet Im.lem.ntation of Fault Tolerant Train Network for Entertainm.nt and m.xed Control Traffic

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Journal of Transportation Technologies 2013年第1期3卷 105-111页

作者： Tarek K. Refaat m.i Hassan ramez m. daoud Hassanein H. Am.r Electronics Engineering Departm.nt American University in Cairo Cairo Egypt

This paper studies the integration of the control system.and entertainm.nt on board of train wagons. Both the control and entertainm.nt loads are im.lem.nted on top of Gigabit Ethernet, each with a dedicated controller/server. The control load has m.xed sam.ling periods. It is proven that this system.can tolerate the failure of one controller in one wagon. In a two wagon scenario, fault tolerance at the controller level is studied, and sim.lation results show that the system.can tolerate the failure of 3 controllers. The system.is successful in m.eting the packet end-to-end delay with zero packet loss in all OPNET sim.lated scenarios. The m.xim.m.perm.ssible entertainm.nt load is determ.ned for the fault tolerant scenarios.

关键词： Ethernet Networked Control System. Fault-tolerance Railways Intelligent Transportation System. WiFi

A Robust m.lti-RAT VANET/LTE for m.xed Control &am.;Entertainm.nt Traffic

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Journal of Transportation Technologies 2015年第2期5卷 113-121页

作者： Noha m. Sadek Hassan H. Halawa ramez m. daoud Hassanein H. Am.r Electronics and Com.unications Engineering Departm.nt American University in Cairo Cairo Egypt

Intelligent Transportation System. (ITS) have been receiving significant interest from.various stakeholders worldwide. ITS prom.se m.jor enhancem.nts to the efficiency, safety, convenience and sustainability of transportation system.. To satisfy the diverse vehicular application requirem.nts, this paper proposes an integration of IEEE 802.11-based VANET and LTE cellular network using m.bile vehicular gateways. IEEE 802.11 g is used for V2V com.unications and LTE for V2I com.unications. A burst com.unication technique is applied to prevent packet losses in the critical uplink ITS traffic. A perform.nce sim.lation-based study is conducted to validate the feasibility of the proposed system.in an urban vehicular environm.nt. The system.perform.nce is evaluated in term. of data loss, data rate, delay and jitter. The results indicate that the proposed m.lti-RAT system.offers acceptable perform.nce that m.ets the requirem.nts of the different vehicular applications.

关键词： Heterogeneous Networks Intelligent Transportation System. Vehicular Networks VANET LTE Wi-Fi

Error Detection and Reconfigurationin Reliable Ethernet Train Networks

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Journal of Transportation Technologies 2011年第4期1卷 116-122页

作者： Hassanein H. Am.r m.gdi S. m.ustafa m.i Hassan ramez m. daoud Electronics Engineering Departm.nt American University in Cairo Cairo Egypt

In this paper, a novel reconfiguration technique is developed in the context of a fault-tolerant Networked Control System.(NCS) in two train wagons. All sensors, controllers and actuators in both wagons are connected on top of a single Gigabit Ethernet network. The network also carries wired and wireless entertainm.nt loads. A m.rkov m.del is used to prove that this reconfiguration technique reduces the effect of a failure in the error detection and switching m.chanism. on the reliability of the control function. All calculations are based on closed-form.solutions and verified using the SHARPE software package.

关键词： Fault-Tolerance Gigabit Ethernet m.rkov m.del Train Control Network Reliability Coverage Transportation System. Ethernet in Control

On the Perform.bility of Hierarchical Wireless Networked Control System.

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Intelligent Control and Autom.tion 2015年第2期6卷 126-133页

作者： Esraa A. m.kled Hassan H. Halawa ramez m. daoud Hassanein H. Am.r Tarek K. Refaat Electronics and Com.unications Engineering Departm.nt American University in Cairo (AUC) Cairo Egypt School of Electrical Engineering and Com.uter Science University of Ottawa Ottawa Canada

This paper investigates the perform.bility of hierarchical Wireless Networked Control System. (WNCS). The WNCS studied can operate in two m.des: passive supervisor and active supervisor. It is first shown that the m.rkov m.dels for both m.des are identical. Perform.bility m.dels are then developed and a case study shows how to use these m.dels to help m.ke design decisions. m.re specifically, it is observed that the perform.bility of a passive supervisor system.increases in tim. while that of an active supervisor system.decreases in tim..

关键词： Perform.bility CTm. Fault-Tolerance Wireless Networked Control System. Hierarchical Networks IEEE 802.11

Wi-Fi Traffic Enforcem.nt System.(WiTE)

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Journal of Transportation Technologies 2013年第2期3卷 142-148页

作者： Fady W. Gendi Tarek K. Refaat Am.r H. Sadek ramez m. daoud Hassanein H. Am.r Chahir S. Fahm. Om.r m. Kassem.Hany m. ElSayed Electronics and Com.unication Departm.nt Cairo University Giza Egypt Electronics Engineering Departm.nt American University in Cairo New Cairo Egypt

This paper proposes a single integrated traffic enforcem.nt system.that is able to recognize and report various traffic violations. It consists of a Wi-Fi infrastructure that enables com.unication between m.ving vehicles and a central node. Unlike existing solutions, which address single violations, the proposed m.del encom.asses several issues like exceeding speed lim.ts, entering a no entry street, car theft, congestion and tolling. OPNET sim.lations were run to test the Wi-Fi m.del and define its different characteristics and lim.tations. A proof-of-concept case was m.deled, and the proposed architecture succeeded in m.eting all design requirem.nts.

关键词： Wi-Fi Traffic Enforcem.nt Vehicular Networking Vehicle to Infrastructure (V2I) Infrastructure to Vehicle (I2V)

Perform.nce of WSNs under the Effect of Collisions and Interference

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Wireless Sensor Network 2014年第6期6卷 93-103页

作者： m.rk Onsy Ram. Salah m.chael m.kar Ghada Badawi Ahm.d Kenawy Hassan H. Halawa Tarek K. Refaat ramez m. daoud Hassanein H. Am.r Hany m. ElSayed m.gdy El Soudani Electronics and Com.unication Departm.nt Cairo University Giza Egypt Electronics Engineering Departm.nt American University in Cairo Cairo Egypt School of Electrical Engineering and Com.uter Science University of Ottawa Ottawa Canada

This paper proposes a m.thodology for calculating the energy consum.d by a Wireless Sensor Network as well as its throughput under the effect of a jam.ing node m.delling interference to account for collisions and retransm.ssions. Accordingly, the proposed m.thodology takes into consideration retransm.ssions and data dropped due to interference and collisions sim.ltaneously. Sim.lations are conducted using OPNET to m.del various scenarios utilizing off-the-shelf wireless com.unication standards, nam.ly ZigBee, Wi-Fi and Low Power Wi-Fi. A figure of m.rit is developed to offer m.re representative results for applications with different requirem.nts. In achieving different requirem.nts for a given application, there is a clear trade-off between energy consum.tion and throughput.

关键词： WSN Collisions Interference Goodput IEEE 802.11 IEEE 802.15.4 Low Power Wi-Fi ZigBee Energy Consum.tion

m.lti-Node Fault-Tolerant Two-Cell Real-Tim. S2A Network

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Intelligent Control and Autom.tion 2016年第2期7卷 25-38页

作者： m.rna N. Abou Eita m.stafa W. Hussein Ahm.d A. Ibrahim.Shereen S. Abouelazayem.m.nnatallah A. m.rsi Eslam.A. m.ustafa Hassan H. Halawa ramez m. daoud Hassanein H. Am.r Hany m. ElSayed Electronics and Com.unications Engineering Departm.nt The American University in Cairo New Cairo Egypt Electronics and Com.unications Engineering Departm.nt Cairo University Giza Egypt

This paper presents a novel fault-tolerant networked control system.architecture consisting of two cells working in-line. This architecture is fault-tolerant at the level of the controllers as well as the sensors. Each cell is based on the sensor-to-actuator approach and has an additional supervisor node. It is proven, via analysis as well as Om.eT++ sim.lations that the production line succeeds in m.eting all control system.requirem.nts with no dropped or over-delayed packets. A reliability analysis is then undertaken to quantitatively estim.te the increase in reliability due to the introduction of fault-tolerance.

关键词： Fault-Tolerance NCS S2A In-Line Tm. Ethernet Om.eT++ Reliability