Heating and cooling device for motorhomes and caravans
Authors : M. Bani Khaled, A. Qandil, N. Abdellatif, N. Beithou, Sameh Alsaqoor, Ali Alahmer, H.S¸ Aybar, Artur Andruszkiewicz
Abstract : Disasters, extreme weather conditions, and rural recreation make the availability of a portable heating and cooling device as a must. There are many devices that work on heating and power generation in the market. The air conditioner which works on the heat pump principle is well known. Harsh weather conditions, natural disasters, and recreation in rural areas (deserts and mountains) require the availability of a heating and cooling device that works on well-available fuel and has a low fuel consumption rate. Such a device will help in saving lives and encourage rural tourism. This paper proposes a heating and cooling device for rural places, harsh weather conditions, and natural disasters where no electricity is available. The device works on the heat pump (HP) principle to optimize its performance. The energy source selected for this device is fossil fuels; fossil fuel is used for convenience where no electricity is available. Low vibration, low noise Stirling Engine (SE) is used to drive the heat pump that produces heating/cooling effects. Analysis of the proposed device is performed for each of its components. The results attained from the analysis coincide with the results in the literature. An electricity-free, low vibration, silent and improved CHC device was attained. With suitable selected sub- devices an OHR of 2.429 was achieved by the proposed device compared to currently available devices
Keywords : CHC, Mathematical modeling, Diesel burner, Residential comfort, Heat pump, Stirling engine
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Fitness Function X-means for prolonging Wireless Sensor Networks Lifetime
Authors : Abdelrahman Radwan, Nasser Abdellatif , Eyad Radwan, Maryam Akhozahieh
Abstract : X-means and K-means are clustering algorithms proposed as a solution for prolonging Wireless Sensor Networks (WSN) lifetime. In general, X-means overcomes K-means limitations such as predetermined number of clusters. The main concept of X-means is to create a network with basic clusters called parents and then generated (j) number of children clusters by parents splitting. X-means did not provide any criteria for splitting parents clusters, nor does it provide a method to determine the acceptable number of children. This article proposes FFX-means as an enhancement of X-means; FFX-means has a new method that determines if the parent clusters are worth splitting or not based on predefined network criteria, and later on it determines the number of children. Furthermore, FFX-means proposes a new cluster-heads selection method, where the cluster-head selected based on the remaining energy of the node and the intra-cluster distance. The simulation results show that FFX-means extend network lifetime by 11.5% over X-means and 75.34% over K-means. Furthermore, the results show that FFX-means balance the node's energy consumption, and nearly all nodes depleted their energy within an acceptable range of simulation rounds.
Keywords : Clustering, K-means, X-means, Energy Efficient, Routing, Wireless, sensor networks
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Method for the analytical evaluation of convolution integral
Authors : Maryam Akhozahieh, Osama Nashwan, and Nasser Abdellatif
Abstract : The convolution integral is a linear operation. Invoking the linearity property, the superposition principle is applied in this paper to obtain the convolution integral between two signals. The method depends on dividing the two signals into several segments; each has a fixed function and a finite or infinite width. Depending on the product of the segments' number of the first signal and that of the second signal, the evaluation of the convolution integral is divided into several sectors. Within each sector, one, two, or three integrals are needed to be calculated. The number of the integrals and the limits for each one depends on the width and the edge points of the two signals' segments involved in a particular sector. After calculating all integrals, the superposition principle is applied to find the convolution integral for a specific period. The unit step function can be applied to express the convolution integral as a single expression.
Keywords : convolution integral, linearity, superposition, unit step function.
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Performance analysis of geometric codes
Authors : Nasser Abdellatif and Maryam Akho-Zahieh
Abstract : Forward error-correcting codes have proven their usefulness over traditional communication channels and are of great benefit when conditions are normal. However, these codes perform very poorly over noisy or fading channels. Geometric Codes are classes of codes that outperform error-correcting codes over noisy channels
Keywords : geometric codes, fading channels, code rate, parity symbol
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Effect of Coding and Diversity on the Performance of Wavelet Packets Multicarrier Multicode CDMA System
Authors : Maryam Mahmoud Akho-Zahieh, Nasser Abdellatif
Abstract : Coding and diversity are two techniques that can be used to improve communication system performance. The aim of this paper is to compare the effect of coding and diversity on the bit error rate performance of wavelet packets-multicarrier\multicode coded division multiple access systems. Two different code rates have been considered, namely, R = 1/2 and R = 1/3. In addition, three types of diversity have been discussed, which are selection diversity, equal gain combining, and maximum ratio combining. This study includes the effect of code rate, the number of substreams, the diversity order, the multipath intensity profile, the Nakagami parameter, and the number of uses. The study reveals that the code rate R=1/3 outperforms the code rate R=1/2. In addition, it has been noticed that the system with coding outperform the system with diversity when the channel interference is minimal, which includes less number of path, a small Nakagami parameter, and a small number of users. The system with a maximum ratio combining diversity in most conditions has the best performance.
Keywords : diversity, wavelet, multicarrier, Nakagami, Multicode, Code Rate, Packets, system with coding
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Performance Analysis of MIMO wavelet Packet multicarrier multicode CDMA system with antenna selection
Authors : Nasser Abdellatif Maryam Mahmoud Akho-Zahieh
Abstract : Performance of Multicarrier Multicode Code-Division Multiple Access (MC/MCD-CDMA) systems can be improved significantly by using Wavelet Packets (WPs) as subcarriers instead of a sinusoidal function. This is because WPs have much lower sidelobes and negligible sidelobe energy leakage compared to sinusoidal carriers; this property significantly decreases the intercarrier interference and improves the system performance. Further improvement can be achieved by utilizing multiple antennas at transmitter and receiver to construct a Multiple-Input Multiple-Output (MIMO) system. Channel hardening is the main drawback of MIMO systems. Antenna selection can be employed to reduce this problem. In this paper, we use the antenna selection in MIMO WP-MC/MCD-CDMA system. These combinations of antenna selection, MIMO, and WP in MC/MCD-CDMA improve the system performance significantly and reduce the channel hardening. The performance of the system is tested according to the outage probability and bit error rate. Two MIMO schemes on Nakagami-m fading channel are considered, which are: selective transmit /selective receive and selective transmit /maximum ratio combining receive. The study includes the effects of antennas' number, fading parameter-m, number of users, and the threshold signal to interferences plus noise ratio. The performance of the system is compared to that of MC/MCD-CDMA based on a sinusoidal carrier. The results reveal that: by increasing antennas' number, the system performance is improved significantly, and MC/MCD-CDMA system based on WPs carriers outperforms MC/MCD-CDMA system based on a sinusoidal carrier.
Keywords : Diversity; MIMO; Nakagami channel; wavelet packets.
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IMPACT OF DISCOVERY-BASED METHODOLOGY ON THE PERFORMANCE OF ELECTRICAL ENGINEERING STUDENTS
Authors : Khalil Saleh and Nasser Abdellatif
Abstract : This paper studies the impact of discovery-based courses at the Electrical Engineering Department on student performance. The research uses a quantitative approach by collecting data through a 14 itemsquestionnaire given to Electrical Engineering students at Applied Science Private University in Jordan. SPSS software was used to analyze data and derive appropriate conclusions. The study reaches three main findings. First, many students believe that they are benefiting more from this methodology. Second, students are more willing to attend and participate in activities during class time. Third, students feel that they obtain a deep understanding of the concepts than before.
Keywords : discovery-based, concepts, attendance, Education.
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Utilization of abrasive water jet for cutting parts of intricate shapes
Authors : Safwan M. A. Al-Qawabah , Adnan I. O. Zaid and Nasser Abdellatif
Abstract : As early as 1974, the British Hydrodynamic Research Association, BHRA, held the First International Conference on Cutting by Water Jets. The subject was at its early stages. Since then, a large amount of research work has been carried out, and the process has been greatly developed. In this paper, the utilization of water jets for flexible cutting parts of intricate shapes in steel plates and granite is presented and discussed.
Keywords : Abrasive water jet, intricate shapes, flexible cutting
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Utilization of Natural Resources in Jordan for Energy Storage
Authors : Adnan I. O. Zaid, Naser Abdellatif
Abstract : Jordan is a developing and non-producing oil country. The majority of its energy needs are imported from the neighboring Arab countries, where only 4% of its needs are produced locally, and 96% are imported. However, Jordan is very rich in renewable energy resources. The main objective of this work is to discuss the challenges facing the Jordanian energy sector and evaluate the renewable energy resources of the country. The main renewable energy resources in Jordan are solar, wind, geothermal and biomass. Using these energy resources may significantly decrease the energy reliance on oil that is imported from the Arab oil neighboring countries and improve the Jordanian population's access to energy and hence enhance the economic situation and hence improve the standard of living of the people in the country. It is expected that wind and solar energy resources have the potential to account for a certain percentage of electricity demand; the utilization of the geothermal energy for heating and cooling can reduce the cost of conventional energy used for these applications, especially since Jordan is very rich in this item. The geothermal wells are distributed all over the country. Regarding biomass resources, the conversion of agricultural waste into biodiesel can also reduce diesel imports. Similarly, the conversion of animal waste into biogas has the potential to replace a certain % of the imported LPG. Finally, a reliable, economic insulated storage tank that utilizes sand as a storage medium that can be easily maintained is suggested and discussed.
Keywords : Utilization, Natural resources, Jordan, Energy storage, Wind energy, Solar energy, Geothermal energy
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Narrowband Interference Suppression in Wavelet Packet Multirate Multicarrier Multicode CDMA System
Authors : Maryam Akhozahieh, Nasser Abdellatif
Abstract : Multicode (MCD) scheme can be used to transmit information with Multirate (MR) in the Multicarrier Code Division Multiple Access (MC-CDMA) system. Since wavelet packets (WPs) have lower sidelobes compared with sinusoidal carriers, then systems which use WPs as subcarriers are very effective in reducing the problem of intercarrier interference. The CDMA can suppress a given amount of interference. To mitigate the effect of narrowband jammer interference, a suppression filter (SF) can be used in the receiver. Also, to reduce multiple access interference, diversity techniques can be used. In this paper, the bit error rate performance of a system denoted by WPMRCDMA is tested. The effects of SF type and number of taps were investigated. Also, the effect of service rates is presented.
Keywords : Multirate, Suppression filter, Wavelet Packets
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Effect of Diversity and Filtering on the Performance of Wavelet Packets Base Multicarrier Multicode CDMA System
Authors : Maryam M. Akho-Zahieh, Nasser Abdellatif
Abstract : In Wavelet Packets Based Multicarrier Multicode CDMA system, the multicode (MCD) part ensures the transmission for high speed and flexible data rate, the multicarrier (MC) part ensures the flexibility of handling multiple data rates, and the wavelet packets modulation technique contributes to the mitigation of the interference problems. The CDMA system can suppress a given amount of interference. In this paper, the receiver employs a suppression filter (SF) to mitigate the effect of narrowband jammer interference and diversity techniques to reduce multiple access interference. The framework for the system and the performance evaluation are presented in terms of bit error rate (BER) over a Nakagami fading channel. Also, we investigate how the performance is influenced by various parameters, such as the number of taps of the SF, the ratio of narrowband interference bandwidth to the spread-spectrum bandwidth, the diversity order, the fading parameter, and so on. Finally, the performance of the system is compared with the performance Sinusoidal (Sin) based MC/MCD CDMA system.
Keywords : Wavelet Packets, Multicarrier, Multicode, Diversity, Suppression Filter
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Narrowband interference suppression in wavelet packets based multicarrier multicode CDMA overlay system
Authors : Maryam M. Akho-Zahieh, Nasser Abdellatif
Abstract : The wavelet packets based multicarrier (MC) multicode (MCD) code-division multiple-access (CDMA) transceiver consists of the MCD part, which ensures the transmission for high speed and flexible data rate; the MC part contributing to robustness to frequency-selective fading and flexibility for handling multiple data rates; and wavelet packets (WPs) modulation technique, which contributes to the mitigation of the interference problems. As WPs have lower sidelobes compared with sinusoidal carriers, this system is very effective in reducing the problem of inter-carrier interference. Of course, like any CDMA system, the system can suppress a given amount of interference. This paper considers an interference suppression scheme that will enhance the performance of the system. The receiver employs suppression filters to mitigate the effect of narrowband jammer interference. The framework for the system and the performance evaluation are presented in terms of the bit error rate and the outage probability over a Nakagami fading channel. Also, we investigate how the performance is influenced by various parameters, such as the number of taps of the suppression filter and the ratio of narrowband interference bandwidth to the spread-spectrum bandwidth. Finally, the performance of the system is compared with the performance of sinusoidal-based MC/MCD-CDMA system denoted Sin-MC/MCD-CDMA.
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Performance Analysis of MIMO wavelet Packet multicarrier multicode CDMA system with antenna selection
Authors : Nasser Abdellatif Maryam Mahmoud Akho-Zahieh
Abstract : Performance of Multicarrier Multicode Code-Division Multiple Access (MC/MCD-CDMA) systems can be improved significantly by using Wavelet Packets (WPs) as subcarriers instead of a sinusoidal function. This is because WPs have much lower sidelobes and negligible sidelobe energy leakage compared to sinusoidal carriers; this property significantly decreases the intercarrier interference and improves the system performance. Further improvement can be achieved by utilizing multiple antennas at transmitter and receiver to construct a Multiple-Input Multiple-Output (MIMO) system. Channel hardening is the main drawback of MIMO systems. Antenna selection can be employed to reduce this problem. In this paper, we use the antenna selection in MIMO WP-MC/MCD-CDMA system. These combinations of antenna selection, MIMO, and WP in MC/MCD-CDMA improve the system performance significantly and reduce the channel hardening. The performance of the system is tested according to the outage probability and bit error rate. Two MIMO schemes on Nakagami-m fading channel are considered, which are: selective transmit /selective receive and selective transmit /maximum ratio combining receive. The study includes the effects of antennas' number, fading parameter-m, number of users, and the threshold signal to interferences plus noise ratio. The performance of the system is compared to that of MC/MCD-CDMA based on a sinusoidal carrier. The results reveal that: by increasing antennas' number, the system performance is improved significantly, and MC/MCD-CDMA system based on WPs carriers outperforms MC/MCD-CDMA system based on a sinusoidal carrier.
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Performance analysis of wavelet packet multirate multicarrier multicode CDMA wireless multimedia communications
Authors : Maryam M Akho-Zahieh, Nasser Abdellatif
Abstract : Different kinds of Multirate (MR) communication systems, such as multicode (MCD) scheme and variable spreading length (VSL) schemes, have been considered for accommodating information sources with different data rates in Multicarrier code-division multiple access (MC-CDMA). In this paper, we propose the use of MCD scheme for MR services in MC/MCD-CDMA system that employs wavelet packets (WPs) as subcarriers. The bit error rate (BER) performance for the system was investigated by means of analytical methods and numerical results in a slow fading frequency selective Nakagami channel. The performance analysis includes the effects of diversity techniques, channel intensity profile, diversity order , and fading parameter. Also, the effects of different service rates and the number of users in each service rate were investigated. The performance of the system was compared to that of MC/MCD-CDMA based on a sinusoidal carrier. Results reveal that BER performance is proportional to the service rate and our proposed system outperforms the other system.
Keywords : Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Narrowband interference suppression in wavelet packets based multicarrier multicode CDMA overlay system
Authors : Maryam M Akho‐Zahieh, Nasser Abdellatif
Abstract : The wavelet packets based multicarrier (MC) multicode (MCD) code-division multiple-access (CDMA) transceiver consists of the MCD part, which ensures the transmission for high speed and flexible data rate; the MC part contributing to robustness to frequency-selective fading and flexibility for handling multiple data rates; and wavelet packets (WPs) modulation technique, which contributes to the mitigation of the interference problems. As WPs have lower sidelobes compared with sinusoidal carriers, this system is very effective in reducing the problem of inter-carrier interference. Of course, like any CDMA system, the system can suppress a given amount of interference. This paper considers an interference suppression scheme which will enhance the performance of the system. The receiver employs suppression filters to mitigate the effect of narrowband jammer interference. The framework for the system and the performance evaluation are presented in terms of the bit error rate and the outage probability over a Nakagami fading channel. Also, we investigate how the performance is influenced by various parameters, such as the number of taps of the suppression filter and the ratio of narrowband interference bandwidth to the spread-spectrum bandwidth. Finally, the performance of the system is compared with the performance of sinusoidal based MC/MCD-CDMA system denoted Sin-MC/MCD-CDMA. Copyright © 2012 John Wiley & Sons, Ltd.
Keywords : Narrowband, suppression filter, Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Effect of jamming and diversity on the performance of a wavelet packet based multicarrier multicode CDMA communication system
Authors : Maryam M Akho‐Zahieh, Nasser Abdellatif
Abstract : In this paper, the performance of multicarrier (MC), multicode (MCD), code division multiple access (CDMA) system employing wavelet packets (WPs) as subcarriers for modulation in the presence of narrowband interference is investigated. The performance analysis include the effects of diversity techniques such as selection, equal gain and maximal ratio combining. The system performance is evaluated by means of bit error rate (BER) and outage probability. The effects of system parameters such as channel intensity profile, diversity order and fading parameter on the system performances were investigated by means of analytical methods and numerical results. Also, the effect of jamming power is investigated. The performance of the system is compared to that of MC/MCD-CDMA based on sinusoidal carrier. Results reveal considerable performance improvement of the system that employ diversity techniques over the one without diversity and of our proposed system over the other system.
Keywords : Narrowband, suppression filter, Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Outage Probability Performance of Wavelet Packet Multirate Multicarrier Multicode CDMA System
Authors : Maryam M Akho‐Zahieh, Nasser Abdellatif
Abstract : Multirate (MR) communication systems, such as multicode (MCD) scheme and variable spreading length (VSL) schemes, have been considered for transmitting information with different data rates in Multicarrier code-division multiple access (MC-CDMA) systems. In this paper, a novel system that uses the MCD scheme for MR services in WP-MC/MCD-CDMA system is presented. The Outage Probability (P) performance for the system was investigated by means of analytical methods and numerical results in a slow fading frequency selective Nakagami channel. The performance analysis includes the effect of fading parameter, different service rates, number of users in each service rate, WPs families and their filter length, and also a number of superstreams. The performance of the system was compared with that of MC/MCD-CDMA based on sinusoidal carrier. The results reveal that P performance is directly proportional to the service rate, fading parameter, and WPs filter length. It is inversely proportional to the number of users and fluctuates with the number of superstreams. Our proposed system outperforms the other systems. It is shown that considerable performance improvement can be obtained by using WPs as subcarriers.
Keywords : Narrowband, suppression filter, Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Effect of Narrowband Interference on the Performance of Wavelet Packets Based Multicarrier CDMA System with Decorrelating Multiuser Detector
Authors : Maryam M Akho‐Zahieh, Nasser Abdellatif
Abstract : In this paper, we study the effect of narrowband interference at the performance of wavelet packets (WP) multicarrier (MC) code division multiple access (CDMA) system that employ decorrelating multiuser detector. The bit error rate and the outage probability are derived as performance measure for three types of diversity techniques, namely selection diversity, equal gain combining and maximum ratio combining. The system performance is compared with the performances of a wavelet packet based multicarrier system employing single user detection and multicarrier system based on sinusoidal carrier employing multiuser detection. Results reveal considerable performance improvement of our proposed system over other systems.
Keywords : Narrowband, suppression filter, Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Performance of wavelet packets based multicarrier multicode CDMA communication system in the presence of narrowband jamming
Authors : Maryam Akho-Zahieh, Khalil Saleh, Nasser Abdellatif
Abstract : In this paper, the performance of multicarrier (MC), multicode (MCD), and code division multiple access (CDMA) systems employing wavelet packets (WPs) for modulation in the presence of narrowband jamming is investigated. The system's performance is evaluated by means of bit error rate (BER) and outage probability (Pout). The effects of channel intensity profile, type of wavelet families and their filters length, number of superstreams of wavelets and number of substreams on the system performances were investigated by means of analytical methods and numerical results. Also, the performance of the system is compared to that of MC/MCD-CDMA based on sinusoidal carrier. Results reveal considerable performance improvement of MC/MCD-CDMA system based on WPs carrier over the system based on sinusoidal carrier.
Keywords : Narrowband, suppression filter, Multirate, Multicode, Wavelet packet, Multicarrier, CDMA
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Dynamic routing of "sub-wavelength" connections in IP/MPLS over WDM networks
Authors : Ahmad Khalil, Antonis Hadjiantonis, MA Ali, Nasser Abdellatif, Jalil Moghaddasi
Abstract : We study the connection establishment of low-speed traffic streams over high capacity light paths in IP/MPLS over WDM networks. Specifically, we present different adaptive routing algorithms to dynamically route traffic flows over the logical topology, and we compare their performance evaluations in term of call blocking rate with the conventional shortest path traffic-grooming algorithm approaches.
Keywords : Dynamic routing, sub-wavelength, traffic-grooming, WDM networks, IP/MLPS
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Multicast traffic grooming in WDM networks
Authors : Ahmad Khalil, Chadi Assi, Antonis Hadjiantonis, Georgios Ellinas, Nasser Abdellatif, MA Ali
Abstract : We investigate the problem of grooming dynamic multicast traffic in WDM mesh networks. This problem is equivalent to designing a light-tree based logical topology for multicast streams. To the best of our knowledge, this problem has not been considered before in the literature. The problem consists of four parts: (1) multicast routing sub-problem; (2) multicast wavelength assignment sub-problem; (3) design of a light-tree based logical topology sub-problem; (4) traffic-grooming sub-problem.
Keywords : Multicast traffic, WDM mesh networks, light-tree
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A hybrid approach for provisioning sub-wavelength requests in IP-over-WDM networks
Authors : A Hadjiantonis, A Khalil, G Ellinas, MA Ali, Nasser Abdellatif, J Moghaddasi
Abstract : This paper deals with the provisioning of sub-wavelength requests in IP-over-WDM networks. Traditionally, these requests are either provisioned by setting up a lightpath switched transparently all the way from the source to the destination (routing and wavelength assignment - RWA - provisioning), or by using one or more existing lightpaths with enough residual bandwidth to time-multiplex the new traffic. In this work, an interconnection model between the IP and optical layers that allows all control information to be maintained under a single administrative domain (namely, the optical domain) is assumed. This enables hybrid provisioning, which makes use of existing lightpaths and lightpaths to be set up. Three hybrid algorithms are introduced, namely the shortest path first-fit (SPFF), the shortest-path exhaustive search (SPES) and network-wide exhaustive search (NetWES), each differing in the way in which the hybrid paths are sought. Simulation results indicate that all three perform better than the conventional overlay sequential routing, and NetWES performs better than the rest.
Keywords : Intelligent networks, Optical interconnections, Traffic control, Bandwidth, Optical fiber networks, Optical control, Routing, Telecommunication traffic, Gold, Physics
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Interchanging the search space between the logical and physical layers in future IP optical networks
Authors : Antonis Hadjiantonis, Ahmad Khalil, MA Ali, Nasser Abdellatif, Jalil Moghaddasi
Abstract : This paper addresses the problem of dynamically provisioning low-speed connection requests in IP/MPLS centric mesh-based WDM networks with traffic grooming capabilities. Specifically, rather than formulating an optimization problem, this work focuses on building a dynamic logical topology where light paths are set up and torn down in response to dynamic traffic demands. We explore the potential of optimizing the logical topology by means of interchanging the search space between logical and physical layers. We present several search schemes and compare their performances.
Keywords : Sub-wavelength provisioning, Traffic Grooming, IP/WDM Networks, Adaptive Routing, RWA
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Wireless Laptop Computers in the Classroom and How it Revolutionizes Teaching Methods
Authors : Andrew Akinmoladun, Akhil lal, Nasser Abdellatif
Abstract : This paper presents an overview of a wireless laboratory classroom for the new millennium. Teaching methods must adapt to new technologies where students are empowered with mobile academic learning tools and resources. As educators, we need to be forward-looking to anticipate the skill requirements that our students will need when they enter the workforce. Mobile, wireless computing makes it practical to empower all students with the cognitive tools needed to compete in the new academic and financial world. The dated textbooks of the past century can no longer guarantee students' success. We must prepare students to become lifelong consumers of learning. This paper presents an overview of a wireless laboratory classroom at Bronx Community College. We highlight the advantages and disadvantages of wireless connectivity in an educational setting and how to maximize the usage of wireless communication to enhance teaching and learning situations.
Keywords : Classrooms, Community, laptop, Students, Teaching Methods
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Creating a New Culture of teaching and learning using multimedia and technology to enhance science and engineering
Authors : Nasser Abdellatif, Luis Montenegro, Andrew Akinmoladun
Abstract : This paper presents the findings of the studies of the interaction between good teaching techniques, advanced teachers' preparations, and the integration of technology and multimedia into science and engineering courses and its effect on student performance. Every learning process needs a firm foundation, not just in technology but in the content. It needs the structure of an academic discipline, a taught subject, a definable set of skills and techniques, or a body of knowledge that will be possessed by the teacher and the learner. We develop rubrics that are being tested in the teaching of Astronomy and Telecommunication courses. The rubrics focus on teachers' preparation and specific knowledge required on subject pedagogy and constant technology interaction and how it is adapted to the classroom environment
Keywords : interaction, teacher, classroom
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Students’ recruitment and retention through college academic collaboration using college-level courses in telecommunication offered to high school students
Authors : Andrew Akinmoladun, Nasser Abdellatif, Luis Montenegro, Akhil LaL
Abstract : This report reports the findings conducted by the Department of Physics and Technology to address the correlation between the collaboration within community college and high school using telecommunication-related courses offered through community colleges to increase the retention rate of students in the college. Findings indicate that students exposed to telecommunication college bearing courses before graduating from high school have a better chance of completing their college education than students without college-bearing courses while in high school.
Keywords : Community, Schools, students
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Upgrading the Teaching Laboratory of the Physics and Technology Department of the Bronx Community College
Authors : Abdellatif, Nasser and Akinmoladun, Andrew
Abstract : Most of the Equipment requested through this grant offer has been delivered. It has indeed had a profound positive effect on the teaching-learning process within the department, the school, and the community as a whole. Students are now able to practically verify a theoretical concept of learning through the usage of this new equipments and gain valuable hands-on replication of what the real concept looks like, thereby giving them a sense of understanding that can take them to a higher level of understanding and content retention.
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Spinning particles as a nonlinear realization of the superworldline reparametrization invariance
Authors : J Malinsky, VP Akulov, N Abdellatif, A Pashnev
Abstract : The superdiffeomorphisms invariant description of N-extended spinning particle is constructed in the framework of the nonlinear realization approach. The action is universal for all values of N and describes the time evolution of D+ 2 different group elements of the superdiffeomorphisms group of the (1, N) superspace. The form of this action coincides with the one-dimensional version of the gravity action, analogous to Trautman’s
Keywords : superdiffeomorphisms, Spinning particle, superspace, reparametrization invariance
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The estimation of the thickness of the nonsuperconducting layer at the interfaces in YBa2Cu3O7− δ
Authors : VS Boyko, J Malinsky, N Abdellatif, VV Boyko
Abstract : The results of a computer simulation of the atomic structure of interfaces in YBa2Cu3O7−δ (twin boundary and large-angle symmetrical tilt grain boundary) are presented. These results allow us to determine the lattice displacements and distortions in the vicinity of analyzed interfaces. Basing on the strain level ≈ 0.01 as a phenomenological criterion for the suppression of superconductivity, estimates of the thickness of the nonsuperconducting regions enveloping interfaces are made.
Keywords : Twin boundaries, Grain boundaries, Superconductivity
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Turbulent Coastal Dynamics
Authors : V Shnaydman, J Malinsky, N Abdellatif
Abstract : The coastal dynamics model, restoring the three-dimensional hydro-physical structure of the coastal shallow-water area is essentially improved. The improvement involves two-equation of non-localarametrization scheme which is based on turbulent kinetic energy and dissipation rate nonlinear equations, the forcing influence of the surface wind on the drift geostrophic currents and their contribution to the formation of the turbulent exchange in the oceanic shallow-water zone, the interaction between atmospheric boundary layer and oceanic surface. We divide atmospheric turbulent momentum flux into two parts, responsible for development of the drift currents and formation of the wind waves. The kinetic turbulent energy flux from the atmosphere to oceanic eddies defined by the collapse of the surface waves. The depth of intensive dissipation oceanic surface layer and atmospheric friction velocity are used for the calculation of the dissipation in this layer. This model describes more fully mechanisms of turbulent coastal dynamics in the oceanic boundary layer than any one developed so far and can be used for solving many applied problems of coastal oceanic dynamics.
Keywords : Costal Dynamics, oceanic, turbulent kinetic energy, non-localarametrization, turbulent momentum flux, drift currents
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Effective properties for systems with distributed resistances in continuous space
Authors : E. M. Baskin, A. A. Snarskii, A. Morozovskiy, J. Malinsky, N. Abdellatif
Abstract : A system with exponentially distributed resistances is examined here. The importance of field and current distribution inside each resistance is shown to be a necessary sign of the so-called continual problem. Consideration of this current distribution leads to a further increase of the relative spectral density of 1/f noise and the appearance of another critical exponent in comparison with a discrete problem. The critical exponent connected with the inhomogeneity of current distribution inside each resistance has been evaluated.
Keywords : Distributed resistance, current distribution, Spectral Density, continuous space
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Simulation Analysis of an ATM Access-Node Multiplexer with Rate-Based Access Control and Bandwidth Assignment
Authors : S. Saddawi M. Saleh, N. Abdellatif
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The Influence on End Perturbations of the Bridge on Long Range Electron Transfer in Donor-Molecular Chain-Acceptor Systems
Authors : N. Abdellatif and S. Saddawi J. Malinsky
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Thickness of Nonsuperconducting Layer at the Interfaces in Y Ba Cu O
Authors : V. S. Boyko J. Malinsky, N. Abdellatif
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Cell design for a broadband CDMA personal communications network
Authors : LB Milstein, DL Schilling, RL Pickholtz, V Erceg, M Kullback, N Abdelatif, TD Smith, WH Metcalfe
Abstract : The results of field tests consisting of propagation measurements using broadband code division multiple access (B-CDMA) waveforms are described. B-CDMA operates in the 1850-1990 MHz frequency band. The spreading code rate is 24 Mchips/s, which occupies a bandwidth of 48 MHz. With this wide bandwidth, fading due to multipath propagation is minimized, since the bandwidth is much wider than the coherence bandwidth of the fade. Link loss measurements were taken between a B-CDMA transmitter and a mobile user, located at various indoor and outdoor points throughout the region of interest. Using these data, loci of constant link loss were plotted on a regional map. An analysis was performed which relates the number of personal communications network users, the power transmitted, and the link loss. Using the graph obtained from this analysis and the loci constant link loss obtained from the experiments, appropriate cell size and system design information are obtained
Keywords : Broadband communication, Multiaccess communication, Personal communication networks, Bandwidth, Propagation losses, Testing, Frequency, Fading, Coherence, Loss measurement
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Convolutional projection codes
Authors : D.L. Schilling, N. N. Abdellatif
Abstract : The convolutional projection code is presented. Encoding and decoding processes are reviewed, and hardware complexity and performance data are presented. Estimates of the error rates of the code as obtained by computer simulations are presented. The results showed that the code uses very simple encoding and decoding procedures which are easily implemented. Results also showed that the code outperforms many known codes and is comparable in performance to the block projection code, which is harder to implement and more time consuming in the sense that the decoder would have to wait for the entire block to be received before it can start decoding.
Keywords : Convolutional codes, Iterative decoding, Shift registers, Encoding, Telecommunication computing, Cities and towns, Educational institutions, Costs, Error correction, Error correction codes
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