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Search Results: 1 - 10 of 10086 matches for " Ismail Abdul-Jabbar Hasan "
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Design of Security System by Means of Sound Print  [PDF]
Ismail Abdul-Jabbar Hasan
World Journal of Engineering and Technology (WJET) , 2018, DOI: 10.4236/wjet.2018.64060
Abstract: Sound Recognition becomes an important tool for intrusion detection or for the monitoring of public premises exposed to personal hostility. It could further identify different sounds. The main idea of the sound recognition process in a security system is to store samples of different sound signals in the memory of the computer as references,?and?to be analyzed with respect to their frequencies components. In this paper, the sound signal of an unknown source would be analyzed and compared with all the available reference samples,?and?then recognition is made according to the closest sample. The developed security system consists of two main parts: the spectrum analyzer that converts the sound signal to spectrograms. It is designed based on the real-time analyzes, and the recognizer which compares the spectrograms and gives the decision of the recognition by using a special criterion. Experimental results prove that the accuracy of the proposed system can be 98.33% for the selected sample of signals.
A New Hardware Architecture for Parallel Shortest Path Searching Processor Based-on FPGA Technology
Jassim M. Abdul-Jabbar,Majid A. Alwan,Mohammed A. Ali Al-Ebadi
International Journal of Electronics and Computer Science Engineering , 2012,
Abstract: In this paper, a new FPGA-based parallel processor for shortest path searching for OSPF networks is designed and implemented. The processor design is based on parallel searching algorithm that overcomes the long time execution of the conventional Dijkstra algorithm which is used originally in OSPF network protocol. Multiple shortest links can be found simultaneously and the execution iterations of the processing phase are limited to instead of of Dijkstra algorithm. Depending on the FPGA chip resources, the processor is expanded to be able to process an OSPF area with 128 routers. High speed up factors of our proposal processor against the sequential Dijkstra execution times, within (76.77-103.45), are achieved.
Single Crystal Growth of Ga2(SexTe1-x)3 Semiconductors and Defect Studies via Positron Annihilation Spectroscopy
N. M. Abdul-Jabbar,E. D. Bourret-Courchesne,B. D. Wirth
Physics , 2011, DOI: 10.1016/j.jcrysgro.2012.02.011
Abstract: Small single crystals of Ga2(SexTe1-x)3 semiconductors, for x = 0.1, 0.2, 0.3, were obtained via modified Bridgman growth techniques. High-resolution powder x-ray diffractometry confirms a zincblende cubic structure, with additional satellite peaks observed near the (111) Bragg line. This suggests the presence of ordered vacancy planes along the [111] direction that have been previously observed in Ga2Te3. Defect studies via positron annihilation spectroscopy show an average positron lifetime of ~400 ps in bulk as-grown specimens. Such a large lifetime suggests that the positron annihilation sites in these materials are dominated by defects. Moreover, analyzing the electron momenta via coincidence Doppler broadening measurements suggests a strong presence of large open-volume defects, likely to be vacancy clusters or voids.
Effect of stoichiometric vacancies on the structure and properties of the Ga2SeTe2 compound semiconductor
Najeb Abdul-Jabbar,Thomas Forrest,Ronald Gronsky,Edith Bourret-Courchesne,Brian Wirth
Physics , 2015,
Abstract: Ga2SeTe2 belongs to a family of materials with large intrinsic vacancy concentrations that are being actively studied due to their potential for diverse applications that include thermoelectrics and phase-change memory. In this article, the Ga2SeTe2 structure is investigated via synchrotron x-ray diffraction, electron microscopy, and x-ray absorption experiments. Diffraction and microscopy measurements showed that the extent of vacancy ordering in Ga2SeTe2 is highly dependent on thermal annealing. It is posited that stoichiometric vacancies play a role in local atomic distortions in Ga2SeTe2 (based on the fine structure signals in the collected x-ray absorption spectra). The effect of vacancy ordering on Ga2SeTe2 material properties is also examined through band gap and Hall effect measurements, which reveal that the Ga2SeTe2 band gap redshifts by ~0.05 eV as the vacancies order and accompanied by gains in charge carrier mobility. The results serve as an encouraging example of altering material properties via intrinsic structural rearrangement as opposed to extrinsic means such as doping.
Probing the local environment of two-dimensional ordered vacancy structures in Ga2SeTe2 via aberration-corrected electron microscopy
Najeb Abdul-Jabbar,Peter Ercius,Ronald Gronsky,Edith Bourret-Courchesne,Brian Wirth
Physics , 2013, DOI: 10.1063/1.4863974
Abstract: There has been considerable interest in chalcogenide alloys with high concentrations of native vacancies that lead to properties desirable for thermoelectric and phase-change materials. Recently, vacancy ordering has been identified as the mechanism for metal-insulator transitions observed in GeSb2Te4 and an unexpectedly low thermal conductivity in Ga2Te3. Here, we report the direct observation of vacancy ordering in Ga2SeTe2 utilizing aberration-corrected electron microscopy. Images reveal a cation-anion dumbbell inversion associated with the accommodation of vacancy ordering across the entire crystal. The result is a striking example of the interplay between native defects and local structure.
The role of stoichiometric vacancy periodicity in pressure-induced amorphization of the Ga2SeTe2 semiconductor alloy
Najeb Abdul-Jabbar,Bora Kalkan,Alastair MacDowell,Ronald Gronsky,Edith Bourret-Courchesne,Brian Wirth
Physics , 2014, DOI: 10.1063/1.4892549
Abstract: We observe that pressure-induced amorphization of Ga2SeTe2 (a III-VI semiconductor) is directly influenced by the periodicity of its intrinsic defect structures. Specimens with periodic and semi-periodic two-dimensional vacancy structures become amorphous around 10-11 GPa in contrast to those with aperiodic structures, which amorphize around 7-8 GPa. The result is a notable instance of altering material phase-change properties via rearrangement of stoichiometric vacancies as opposed to adjusting their concentrations. Based on our experimental findings, we posit that periodic two-dimensional vacancy structures in Ga2SeTe2 provide an energetically preferred crystal lattice that is less prone to collapse under applied pressure. This is corroborated through first-principles electronic structure calculations, which demonstrate that the energy stability of III-VI structures under hydrostatic pressure is highly dependent on the configuration of intrinsic vacancies.
Mohammad Musarraf Hussain*, Mohammad Abdur Rashid , Choudhury Mahmood Hasan and Abdul Jabbar
International Journal of Pharmaceutical Sciences and Research , 2012,
Abstract: Two triterpine acids like 2α, 19α- dihydroxy – 3-oxo-12- ursen- 28-oic acid (1), 2α, 16α, 19α- trihydroxy – 3-oxo-12- ursen- 28-oic acid (2) were isolated from the n-hexane soluble fractions of a methanol extract of the root of Albizzia lebbeck Benth. The structures of the isolated compounds were elucidated as by extensive spectroscopic studies, including high field NMR analyses. This is the first report of isolation of compounds 1- 2 from this species.
Dynamic Service Discovery, Composition and Reconfiguration in a Model Mapping Business Process to Web Services  [PDF]
Zulqarnain Abdul Jabbar, Asia Samreen
Journal of Computer and Communications (JCC) , 2016, DOI: 10.4236/jcc.2016.49004
Abstract: In any organization where SOA has been implemented, all of the web services are registered in UDDI and users’ needs are served by using appropriate web services. So in this paper, we will try to discover a service from repository first that can provide the required output to the user. The process becomes difficult when a single service is not able to fulfill a user’s need and we need a combination of services to answer complex needs of users. In our paper, we will suggest a simpler approach for dynamic service composition using a graph based methodology. This will be a design time service composition. This approach uses the functional and non-functional parameters of the services to select the most suitable services for composition as per user’s need. This approach involves “service classification” on the basis of functional parameters, “service discovery” on the basis of user’s need and then “service composition” using the selected services on the basis of non-functional parameters like response time, cost, security and availability. Another challenge in SOA implementation is that, once the composition has performed, some services may become faulty at runtime and may stop the entire process of serving a user’s need. So, we will also describe a way of “dynamic service reconfiguration” in our approach that will enable us to identify and replace a faulty service that is violating the SLA or is not accessible anymore. This service reconfiguration is done without redoing or reconfiguring the entire composition. In the end, to simulate the proposed approach, we will represent a prototype application built on php 5.4 using My SQL database at backend.
The Professional Medical Journal , 2007,
Abstract: Objective: To determine the number, size, somatotopy and segmental distribution of HRP labeledmotor and sensory neurons forming sciatic nerve in albino rat by using HRP technique. To fined out the distribution ofneurons in sciatic nerve in albino rat in spinal cord from L3S1. The average number, size and segmental distribution ofmotor and sensory neurons were localized by HRP method of tracing neuronal connections. The motor neurons formingSCN ranged 10-60 microns and extended between the caudal part of L3 and rostral part of SI spinal segment. Theyoccupied PPL, PL, C and aL subgroups. The peak frequency distribution of motor neurons was observed in L4-L6spinal segment in SCN. The labeled sensory neurons whose peripheral process run in SCN were localized in L3-S1ipsilateral Dorsal Root Ganglia (DRG). No somatotopic organization of the cells was found in the DRG. The cells weredistributed throughout the ganglia without forming groups. The somal diameters of sensory neurons forming SCNmeasured between 14-58 microns.
Abdul Jabbar
The Professional Medical Journal , 2001,
Abstract: The average number and size of motor units were assessed by investigating the components of motorunits supplied by Tibial Nerve in adult albino rats. The motor neurons forming the Tibial Nervelocalized by HRP technique extended from the caudal part of L3 to S1 segments of the spinal cord.The motoneurons forming the Tibial Nerve (TN) which are distributed mainly in the Posterolateraland Post-Posterolateral groups with few of them are also distributed in the central groups. The average somaldiameter of motoneurons ranged between 12 and 63 m. The motor end-plates on skeletal myofibers ofmuscles supplied by Tibial Nerve were localized by using bromo-indigo and urea-silver technique. The totalof 826 motor units with the size of 137 of the muscles innervated by Tibial Nerve have been observed in thepresent study.
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