Mohammed Abdala

Al-Hussain University College · Department of Medical Instrumentation Techniques Engineering

Background Recent research shows AKI increases the risk of incident CKD. We hypothesized that perioperative AKI may confer increased risk of subsequent CKD compared to nonperioperative AKI. Methods A MEDLINE search was performed for “AKI, CKD, chronic renal insufficiency, surgery, and perioperative” and related terms yielded 5209 articles. One tho...

Cloud-computing is becoming an increasingly popular model for accessing computing resources. The demand for advanced computing capabilities is increasing; however, conventional resource management systems have many drawbacks such as being costly, limited resources, and inefficiency. Therefore, an advanced management is needed. In this paper, we pro...

WiMAX- Worldwide Interoperability for Microwave Access-is an innovation standard for long-separation extend remote systems that incorporate both portable WiMAX 802.16e and fixed WiMAX 802.16d associations. WiMAX hardware exists in two essential structures base stations, WiMAX base station can give an inclusion region to an exceptionally enormous zo...

In the last recent years, Data-Center (DC) networks improved according to the rapid exchanging in its requirements. The traditional DC network contains tens of thousands of hosts with distinctive needs of bandwidth. The traditional networking devices have control planes and data planes coupling. These networking devices do not meet the dynamic calc...

WiMAX- Worldwide Interoperability for Microwave Access-is an innovation standard for long-separation extend remote systems that incorporate both portable WiMAX 802.16e and fixed WiMAX 802.16d associations. WiMAX hardware exists in two essential structures base stations, WiMAX base station can give an inclusion region to an exceptionally enormous zo...

WiMAX- Worldwide Interoperability for Microwave Access-is an innovation standard for long-separation extend remote systems that incorporate both portable WiMAX 802.16e and fixed WiMAX 802.16d associations. WiMAX hardware exists in two essential structures base stations, WiMAX base station can give an inclusion region to an exceptionally enormous zo...

Current requirements in the development of Information and Communication Technologies (ICT) are guiding new challenges to the future Internet, for which universal availability, large bandwidth utilization, and dynamic management are critical. However, traditional methods, where a manual configuration of branded devices is used, are complex and fall...

span>In the last two decades, networks had been changed according to the rapid changing in its requirements. The current Data Center Networks have large number of hosts (tens or thousands) with special needs of bandwidth as the cloud network and the multimedia content computing is increased. The conventional Data Center Networks (DCNs) are highligh...

In the last two decades, networks had been changed according to the rapid changing in its requirements. The current Data Center Networks have large number of hosts (tens or thousands) with special needs of bandwidth as the cloud network and the multimedia content computing is increased. The conventional Data Center Networks (DCNs) are highlighted b...

VANET (Vehicular Ad-Hoc Network) is the technology that uses vehicles as nodes connected to form a wireless network. It classified as a type of the wireless Ad-Hoc Networks. The main goal of VANETs is to provide a wireless connection between vehicles and with the roadside unites to enable the data transmission to ensure the safety of drivers, the m...

In vehicular ad-hoc networks, security is one of the most challenging problem. This is because of the nature of the network that has high speed, mobility and large amount of network entities, so the controlling of network becomes more difficult and may lead the network to be vulnerable to the security attacks that affect its performance. One of the...

Among many problems that reduced the performance of the network, especially Wide Area Network, congestion is one of these, which is caused when traffic request reaches or exceeds the available capacity of a route, resulting in blocking and less throughput per unit time. Congestion management attributes try to manage such cases. The work presented i...

Smart Antenna Systems (SAS) is an additional feature in WiMAX technology IEEE 802.16e. SAS have the capability in focusing on the energy in a certain direction. This helps in achieving higher data rate transmission and improving system capacity. In this paper, WiMAX network is integrated with SAS in order to study and analyze its performance. WiMAX...

VANET is a type of wireless networks that emerged in recent years, which provides communication between the moving vehicles on the roads, and aims to reduce accidents. The routing protocols in VANET are affected by the vehicles high speed which leads to frequently link breaks between the communicated vehicles, so the ad hoc routing protocols are ad...

One of the most promising research ways for improving the performance of wireless sensor networks (WSNs) is taking the advantage of the mobility of some of the components of the network. This reduces the load on the nodes around the sink that always forwarding packets of other nodes as well as their own packets. In this aper, two controlled sink mo...

A vehicular Ad hoc Network (VANET) is emerged as new technology to communicate between vehicles without using infrastructure. The characteristics of VANET are high mobility and rapid change of topology, so the routing protocols affected by the rapid changes and symmetric link break. This paper evaluates three routing protocols: AODV, OLSR and DYMO,...

This paper presents the application of IEC 61850 protocol in electrical power engineering industry for data communication systems between substations. This IEC 61850 protocol presents new challenges for real-time communication performance between Intelligent Electronic Devices (IEDs) within substation because of the Generic Object Oriented Substati...

The IEEE 1609.4 was developed to support multi-channel operation and channel switching procedure in order to provide both safety and non-safety vehicular applications. However, this protocol has some drawback because it does not make efficient usage of channel bandwidth resources for single radio WAVE devices and suffer from high bounded delay and...

In Wireless Sensor Networks (WSNs), sensors are randomly deployed in the sensor field which brings the coverage problem. Hence sensors need to be deployed in a position such that the sensing capability of the network is fully utilized to ensure high quality of service and thus reducing the complexity of problem. In this paper, Particle Swarm Optimi...

The rise in the number of vehicles has led to a rapid increasing need for vehicle communication today, so the emerging Vehicular Ad Hoc Network (VANET) is becoming more and more important. Routing in VANET is a key issue which decides network performance. Ad Hoc On-Demand Distance Vector (AODV) is one of the widely used reactive routing algorithms...

The IEEE 1609.4 was developed to support multi-channel operation and channel switching procedure in order to provide both safety and non-safety vehicular applications. However, this protocol has some drawback because it does not make efficient usage of channel bandwidth resources for single radio WAVE devices and suffer from high bounded delay and...

An electronic circuit design based on Parallel Genetic Algorithm (PGA) is presented in this paper. The design uses SPICE Simulation Program with Integrated Circuit Emphasis to evaluate the circuit performance and compare it to the requirements. A Parallel Genetic Algorithm is designedandimplementedon a group of desktop PCs running Windows XP and co...

Recent progress of Visual Sensor Networks (VSNs) has been resulted from great development in cameras techniques that has been enabled the development of single chip camera modules that could easily be embedded into inexpensive transceivers. The interconnection of multimedia sources with inexpensive communication devices has enhanced research in the...

The capacity of a Mobile Ad-hoc Network (MANET) can be severely limited due to interference constraints. One way of improving the overall capacity of ad-hoc networks is by the use of smart antenna system (SAS). SAS has the advantage over traditional omnidirectional antennas of being able to orientate radio signals into the concerned directions in e...

The Wireless Sensor Network (WSN) provides a potential technique for monitoring the indoor environment. The proposed system consists of several wireless sensor nodes that are deployed in a building in addition to a local server hosting web base application for storing sensing data. The widely adopted standard for wireless sensor network platform is...

Wireless channels are typically much more noisy than wired links and subjected to fading due to multipath propagation which result in ISI and hence high error rate. Adaptive modulation is a powerful technique to improve the trade off between spectral efficiency and Bit Error Rate (BER). In order to adjust the transmission rate, channel state infor...

In this paper a WLAN network that accesses the Internet through a GPRS network was implemented and tested. The proposed network is managed by the Linux based server. Because of the limited facilities of GPRS such as dynamic IP addressing besides to its limited bandwidth a number of techniques are implemented to overcome these limitations. Dynamic...

In this paper a WLAN network that accesses the Internet through a GPRS network was implemented and tested. The proposed network is managed by the Linux based server. Because of the limited facilities of GPRS such as dynamic IP addressing besides to its limited bandwidth a number of techniques are implemented to overcome these limitations. Dynamic H...

Wireless channels are typically much more noisy than wired links and subjected to fading due to multipath propagation which result in ISI and hence high error rate. Adaptive modulation is a powerful technique to improve the tradeoff between spectral efficiency and Bit Error Rate (BER). In order to adjust the transmission rate, channel state informa...

INTRODUCTION E‐commerce was first made possible by the development of electronic data interchange (EDI), the exchange of business documents from one computer to another in a standard format. EDI originated in the mid‐1960s, when companies in transportation and some retail industries were attempting to create "paperless" offices. In 1993, Mosaic, on...

This research paper deals with the implementation of an eye recognition system using neural network (recognition classifier). The proposed system contains two phases, preprocessing and recognition. The resized image is providing faster processing for training and testing, the size of image is 120×90 pixels. The preprocessed phase extract features f...

In this paper, a problem for Offline Signature Recognition and Verification is presented. A system is designed based on two neural networks classifier and three powerful features (global, texture and grid features). Our designed system consist of three stages: the first is pre-processing stage, second is feature extraction stage and the last is neu...

The combination of wavelet theory and neural networks has lead to the development of wavelet networks (wavenets). Wavenets are feed-forward neural networks which used wavelets as activation functions, and the basis used in wavenet has been called wavelons. Wavenets are successfully used in identification problems. The strength of wavenets lies in t...

In high resolution satellite images, as the image resolution increases, road networks appear to be areas with certain width rather than thin lines or stripes and in the case of urban areas, street grids is the most common type of roads that exists in that form of terrain. The detection and extraction of these forms of roads is very useful in a numb...

Quantum cryptography is anew branch of physics and cryptography which exploit quantum mechanical phenomena to guarantee the secrecy of cryptographic keys. Ekert proposed the well known protocol that quantum key distribution could also be implemented using entanglement between quantum systems. In this paper new model of Ekert protocol in quantum sys...

In this paper, inverse-modeling method applied to extract Doping Profile of the P-N junction in one-dimensional using C-V measurement. This method is guessing the physical parameter from final result. The capacitance-voltage measurement method implemented on the device doping profile extraction is use extensively. The technique that has been appli...

For a high power induction motor drive, the switching frequency produces a large current ripples, which then produce torque ripple. This work is based on the fact that current and torque ripples can be minimized by controlling the firing angles of the inverter switches. In this paper, a comparison between deadbeat and sine PWM techniques are simula...

Deep level effects in GaAs MESFETs have been characterised in the ohmic channel using DLTS, low frequency excess noise and dispersion techniques. An isothermal multi-exponential curve filling method has been devised and implementated into the DLTS system. Multi-exponential curve fltting method is used 10 decompose a multi-exponential transient into...

Detailed measurements are reported of the noise in GaAsFETs. The results are analysed using information obtained from detailed trap characterization. It is found that the noise intensity is very variable between specimens, does not follow the Hooge relation and appears to be related, under some conditions, to the traps which produce the generation-...

A~traet-Detailed measurements are reported of the l/f noise in GaAsFETs. The results are analysed using information obtained from detailed trap characterization. It is found that the 1If noise intensity is very variable between specimens, does not follow the Hooge relation and appears to be related, under some conditions, to the traps which produce...

The /f noise has been measured in the channels of GaAs FETs biased in the ohmic regime. The devices have been studied using many different techniques so that there is a good understanding of their trap and defect properties and their d.c. operation. The significant results are that the /f noise is extremely variable between specimens and with tempe...

Two types of oscillations have been distinguished in the properties of the active channel of a GaAs MESFET, substrate voltage dependent and voltage independent oscillations. They have been shown to originate in the channel-substrate current. The various experimental evidence of the substrate origin of the oscillations is supported by a model in whi...

The characteristics of traps observed by excess generation-recombination (g-r) noise spectroscopy, gM-frequency dispersion spectroscopy and low frequency oscillations are correlated with the properties observed by different versions of DLTS experiments applied to GaAs MESFETs. A comparison of the trap parameters reveals the relative sensitivities o...

The characterization and effects of deep traps in GaAs MESFETs have been studied using several methods. These are the low frequency g-r noise spectroscopy, gM-frequency dispersion spectroscopy and low frequency oscillations. The excess noise spectrum has been fitted to a sum of 1/f noise and one or more g-r Lorentzian spectra due to traps. Although...

The excess noise spectrum has been measured for two series of GaAs MESFET devices from 1.5 Hz to 25 kHz and is fitted to a sum of 1/f noise and one or more generation-recombination (g-r) Lorentzian spectra due to traps. Often a pair of traps is found, for the first time, with close characteristic frequencies. Device characterization using the exces...

I The excess noise spectrum has been measured for two series of GaAs MESFET devices from 1.5 Hz to 25 kHz and is fitted to a sum of l/f noise and one or more generation-recombination (g-r) Lorentzian spectra due to traps. Often a pair of traps is found, for the first time, with close characteristic frequencies. Device characterisation using the exc...

The saturation current of a biased MOS transistor decreases as the temperature is raised. Thus self-heating results in a negative equilibrium output conductance and the possibility of instability in the circuit. Experiments are reported to show that this effect can be relieved over a wide range of bias conditions using a controlled substrate bias d...

Both Bipolar and JFET integrated circuits have been temperature stabilized using an external control circuit. A new technique is introduced for the compensation of the negative differential output conductance which arises due to self-heating in a power DMOS transistor. The substrate voltage of the power transistor is varied, controlled from the dra...