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Hosam O.,Informatics Research Institute IRI
Proceedings - IEEE Symposium on Computers and Communications

The segmentation methods applied in MPEG-4 and H.26× showed mosquito and blocking effect in low bit rate applications. We have proposed a technique mainly directed to solve the mosquito and blocking effect of video coding. The procedure will be referred as Disparity Estimation based Video Codec (DEVC). First the frames are processed by binarization for separating the moving parts from the still parts in the frame; it is analogous to separating an object from the background in image processing. Second multi-resolution images will be created from the motion parts of the frame. The objects will be represented as region segments in each resolution. A matching or correspondence is done between pair of selected frames to compensate for the frames between them. Finally the motion vectors will be created by applying the Steepest Decent Method. DEVC showed comparatively high quality video sequences compared to MPEG-4. In addition the mosquito effect, blocking effect and The Motion Estimation (ME) mismatches have been removed from video sequences at low bit rate. © 2012 IEEE. Source

Kamoun E.A.,Advanced Technology and New Materials Research Institute ATNMRI | Youssef M.E.,Informatics Research Institute IRI | Abu-Saied M.A.,Advanced Technology and New Materials Research Institute ATNMRI | Fahmy A.,Al - Azhar University of Egypt | And 2 more authors.
International Journal of Electrochemical Science

This work explores the synthesis and properties alteration of new nanocomposite membrane system based on polyvinyl alcohol (PVA) blended with hyaluronic acid (HA) and hydroxyapatite (HAP) as nanofiller. The membranes were synthesized by solution-casting method, where PVA was initially modified with orthophosphoric acid (OPA) or sulphuric acid and then epichlorohydrin (EPI) was employed as chemical crosslinker. Physicochemical properties of composite membranes e.g. gel fraction (%), swelling degree and mechanical stability were estimated, depending on PVA modifier agent alteration. Results revealed that the PVA-modifier agent type influenced sharply on most membrane properties. For example, the swelling ability of PVA-HA-HAP composite membranes was reduced apparently with increasing H2SO4 amount as used for PVA modification, unlike it was increased with the used amount of OPA for the same purpose. The mechanical properties were improved with increasing the amount of EPI until certain extent, whereas they have deteriorated controversially with addition of high incorporated amounts of HAP or using high amounts of OPA or H2SO4 for PVA modification. Meanwhile, electrochemical properties of PVA-HA-HAP composite membranes showed a big improvement in ionic conductivity with PVA modification and HAP incorporation as well. An one-dimensional matlab model is devoloped to study the performance of DMFC for different new composite membranes. Both experimatl and modeled performance of differnet membranes in DMFC were compared and discussed in details. © 2015 The Authors. Source

Feteiha M.F.,Queens University | Feteiha M.F.,Informatics Research Institute IRI | Hassanein H.S.,Queens University
IWCMC 2015 - 11th International Wireless Communications and Mobile Computing Conference

MIMO is a key technology in improving the performance of wireless communications. Recently the concept of cooperative communication has emerged as a solution to exploit the potential gains of MIMO on a distributed scale. We propose to use cooperative-MIMO links in LTE-A networks where vehicles act as relaying terminals to a designated vehicle using Decode-and-Forward relaying. To maintain orthogonality of signals, a modified Alamouti-based Space-Time Block Coding (STBC) technique is proposed. Our approach allows exploitation of the multiplexing capability and spatial diversity of typical MIMO schemes in distributed way. We further contribute by deriving error rate and diversity gain as a benchmark to assess our analysis and future research studies. Our findings indicate that significant diversity gains and reduced error rates are achievable. As well, a noticeable reduction in the required transmitting power are observed compared to traditional single antenna deployment. © 2015 IEEE. Source

Hassan G.,University of Leeds | Hassan G.,Informatics Research Institute IRI | Pourkashanian M.,University of Leeds | Ingham D.,University of Leeds | And 3 more authors.
Computers and Chemical Engineering

This investigation develops a three-dimensional Computational Fluid Dynamics (CFD) model to simulate the turbulent diffusion flame on the fire-side of the radiation section of a thermal cracking test furnace coupled with a non-premixed low NOx floor burner. When this type of burners which uses the internal Flue Gas Recirculation (FGR) technique is coupled with large scale furnaces, both the turbulent mixing and chemical reaction rates are comparable and hence this should be considered in the model. Different combustion models are used to simulate the turbulence-chemistry interactions for this flame. The CFD model, based on the Eddy Dissipation Concept (EDC) combustion model coupled with the detailed GRI2.11 reaction mechanism, gives the most reasonable predictions compared with the available experimental data or empirical correlations for the diffusion flame in the thermal cracking test furnace, especially for the flame length and the CO and NOx emissions. © 2013 Elsevier Ltd. Source

Feteiha M.F.,Queens University | Feteiha M.F.,Informatics Research Institute IRI | Qutqut M.H.,Queens University | Hassanein H.S.,Queens University
IWCMC 2014 - 10th International Wireless Communications and Mobile Computing Conference

Cellular operators have concluded that small cell deployments are a very cost-effective and quick solution to meet the ever growing demands on capacity and coverage in cellular networks for indoor and outdoor environments. While traveling in public transit vehicles, cellular subscribers usually experience poor signal reception and low bandwidth. We hence consider deploying small cells onboard (i.e., mobile small cells) such vehicles. This should enhance subscribers' quality of experience (QoE). We consider a Small Base Station (SBS) mounted in a public transit bus (i.e., mobile SBS) to serve onboard users. The mobile SBS aggregates users' traffic to and from the macroBSs. To further extract the underlying rich multipath-Doppler diversities resulting from the fast mobility and the associated selective fading channel, a pre-coded transmission is deployed in the mobile SBS.We examine the achievable gain from enabling aggregation through mobile SBS in terms of the outage probability. We derive a tight-bound closed-form expression for the outage probability in the downlink (DL). Our results indicate that significant gain in outage probability and coverage are achievable. © 2014 IEEE. Source

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