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The task of accurate teleoperation of a large workspace industrial manipulator using a small haptic device having a physically limited workspace still a challenge. This task should be handled carefully without disturbing the user perception of continuously teleoperating the manipulator movement in a natural and precise way. This paper presents the development of a master/slave teleoperation system...
This paper describes a prototype of an assistive device for elderly people under development at the Egypt-Japan University of Science and Technology (E-JUST) named E-JUST Assistive Device (EJAD). Several experiments were carried out using VICON system and inertial sensors to determine the human posture while sit to stand motion. EJAD uses two inertial sensors fused through an ANFIS algorithm. EJAD...
Wireless Sensor Network (WSN) is a network of portable and lightweight sensors used to monitor a specific field and report the data they detect wirelessly to a sink node responsible for the analysis and decision making. WSNs have limited power as well as resources. More advanced sensors known as "multimodal sensors" can report more than one feature, which requires even more efficient utilization...
Wireless Sensor Networks (WSNs) suffer from many limitations such as the computing capabilities, and the allocated bandwidth. However, the limited energy source is the dominant factor where energy starvation occurs due to the large number of messages that need to be transferred through the network. In this paper, we propose new protocols to save the nodes energy as well as prolonging the overall network...
A Wireless Sensor Network (WSN) is a collection of self-organized smart motes for achieving the desire of the assigned application. However, for the different limitations facing these motes including memory available, computational and communicational limitations, clustering them is one of the main solutions for prolonging the lifetime of the network. At the same time, due to the critical information...
Sensor deployment is one of the important problems in Wireless Sensor Network (WSN). Deployment affects the coverage of the network especially in critical applications such as in radiation detection. The contributions of this paper are 1) formulating the radiation detection deployment problem in a mathematical form where optimal solutions could be obtained, 2) utilizing one of the famous heuristic...
This paper describes the development of a dexterous endoscopic parallel manipulator for laparoscopic surgery using rigid mechanism. Endoscopic parallel manipulator is developed based on the concept of virtual chain and screw theory. The inverse and forward kinematics solutions are derived analytically and numerically respectively. Also the singularity analysis is investigated. The known problem of...
This paper proposes a bio-inspired particle swarm optimization algorithm that incorporates random walk for local search techniques in the non-dominated sorting Particle Swarm Optimization (PSO) algorithm in addition to the mechanism of crowding distance, resulting in an efficient and effective optimization method. The proposed algorithm was implemented and evaluated using different benchmark test...
A single-port small-size antenna for cognitive radio (CR) applications is presented. The antenna is based on an ultra-wideband (UWB) design and has a reconfigurable bandpass filter integrated in its feed line. The UWB operation is required for the sensing task in a CR system. Upon activating the filter, the UWB frequency response is transformed into a tunable narrowband one, which is needed for the...
A search-and-track algorithm is proposed for controlling the number of guided modes of planar optical waveguides with arbitrary refractive index profiles. The algorithm starts with an initial guess point in the parameter space that supports a specific number of guided modes. Then, it searches for, and tracks, the boundaries of this space or another space supporting different number of modes. It does...
A planar antenna for employment in overlay and underlay ultra-wideband cognitive radio is presented in this paper. The antenna can be operated as ultra-wideband, for underlay CR and for sensing in the overlay CR. When used in the overlay CR mode, the proposed antenna can selectively have one, two or three notches in the WLAN, WiMAX, and U-NII bands, to prevent interference to primary users operating...
A polarization-reconfigurable slot antenna, for WLAN applications, is presented in this paper. The antenna incorporates a reconfigurable Wilkinson power divider-based feed network, which couples electromagnetic energy to a decagonal slot in the ground plane. The approach, presented herein, is based on electronically reconfiguring the phase difference, between the antenna's feeding ports, to achieve...
Inspite of the huge amounts of image data on the web, mining image data from the web is paid less attention than mining text data, since treating the semantics of images is much more difficult. This paper introduces a new system to mine visual knowledge on the web that aims to build a Domain Oriented Image Directory by using the Earth Mover's Distance and Color signatures. Instead of using a flat...
In this paper, a new approach for removing redundant components from reconfigurable antennas is presented. The approach is based on graph models and it minimizes the number of electronic components used. As an example, a reconfigurable U-Koch microstrip antenna is investigated and redundant switches are removed. The antenna is redesigned and the performance of the optimized prototypes is tested and...
The widespread of embedded computer networks as part of everyday peoples' lives is leading the current research towards smart environments and Ambient Intelligence (AmI). AmI is a new information paradigm where people are empowered through a digital environment that is “aware” of their presence and context and is sensitive, adaptive and responsive to their needs. In this paper, we describe the intelligent...
Sensor deployment problem is one of the important problems in Wireless Sensor Networks (WSN) since it represents the first phase that most of the network operations depends on. Sensor deployment strategies can be classified into two classes which are deterministic and autonomous (random) deployment. In the deterministic deployment, the deployment field is assumed accessible as well as the number of...
In this paper, we explore different sensor deployment problems and how these problems can be solved optimally using the current packing approaches in terms of small-scale problems. In addition, we consider the deployment of either homogenous or heterogeneous sensing devices. The deployment objectives are to maximize the coverage of the monitored field and use the best of the sensing devices characteristics...
In this paper, a novel printed-circuit-board (PCB) antenna that employs electronic tunability is presented. The antenna is based on a 10 mm times 25 mm times 1.6 mm FR4-epoxy substrate, is microstrip-line fed and has a partial ground plane. The proposed antenna is designed and simulated using the Finite-Element Method (FEM) and the Method of Moments (MoM) for two different switching conditions. The...
Activities have been carried out to determine the best electrical operating conditions of GaN HEMT that enable maximum power added efficiency at L-band for switch mode power amplifiers (class F, inverse class F and class E). Satellite radio navigation applications (Galileo) are targeted. Maximization of power added efficiency is of prime importance to save DC power consumption, reduce self heating...
In this paper, we propose a low-cost small-sized microstrip antenna based on a trapezoidal connection between a double-Sierpinski-carpet-shaped (2nd iteration) patch and an I-shaped feed line. The ground plane is partial and is flushed with the feed line. The fundamental characteristics of the proposed design over the UWB frequency band are illustrated herein.
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