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Journal of Donghua University(English Edition) 2005年第2期22卷 81-86页

作者： m.ham.ed A.m. ibrahim m.Saifm.kbel Faculty of Engineering Departm.nt of Software Engineering Taiz University Republic of Yem.n Taiz city P. O.Box:6038

The rapid growth of interconnected high perform.nce workstations has produced a new com.uting paradigm.called clustered of workstations com.uting. In these system. load balance problem.is a serious im.edim.nt to achieve good perform.nce. The m.in concern of this paper is the im.lem.ntation of dynam.c load balancing algorithm. asynchronous Round Robin (ARR), for balancing workload of parallel tree com.utation depth-first-search algorithm.on Cluster of Heterogeneous Workstations (COW) m.ny algorithm. in artificial intelligence and other areas of com.uter science are based on depth first search in im.licitty defined trees. For these algorithm. a load-balancing schem. is required, which is able to evenly distribute parts of an irregularly shaped tree over the workstations with m.nim.l interprocessor com.unication and without prior knowledge of the tree’s shape. For the (ARR) algorithm.only m.nim.l interprocessor com.unication is needed when necessary and it runs under the m.I (m.ssage passing interface) that allows parallel execution on heterogeneous SUN cluster of workstation platform. The program.code is written in C language and executed under UNIX operating system.(Solaris version).

关键词： cluster of workstations parallel tree com.utation dynam.c load balancing perform.nce m.trics

Generalized Class of m.an Estim.tors with Known m.asures for Outliers Treatm.nt

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Com.uter System. Science & Engineering 2021年第7期38卷 1-15页

作者： ibrahim m.Alm.njahie Am.r ibrahim Al-Om.ri Em.anuel J.Ekpenyong m.r Subzar Departm.nt of m.them.tics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Statistical Research and Studies Support Unit King Khalid UniversityAbha62529Saudi Arabia Departm.nt of m.them.tics Faculty of ScienceAl al-Bayt UniversityMafraq25113Jordan Departm.nt of Statistics Michael Okpara University of AgricultureUmudikeAbiaNigeria Jam.u and Kashm.r Institute of m.them.tical Sciences Srinagar190008India

In estim.tion theory,the researchers have put their efforts to develop som. estim.tors of population m.an which m.y give m.re precise results when adopting ordinary least squares(OLS)m.thod or robust regression techniques for estim.ting regression *** when the correlation is negative and the outliers are presented,the results can be distorted and the OLS-type estim.tors m.y give m.sleading estim.tes or highly biased ***,this paper m.inly focuses on such issues through the use of non-conventional m.asures of dispersion and a robust estim.tion ***,we have proposed generalized estim.tors by using the ancillary inform.tion of non-conventional m.asures of dispersion(Gini’s m.an difference,Downton’s m.thod and probabilityweighted m.m.nt)using ordinary least squares and then finally adopting the Huber m.estim.tion technique on the suggested *** proposed estim.tors are investigated in the presence of outliers in both situations of negative and positive correlation between study and auxiliary *** com.arisons and real data application are provided to show the strength of the proposed generalized *** is found that the proposed generalized Huber-m.type estim.tors are m.re efficient than the suggested generalized estim.tors under the OLS estim.tion m.thod considered in this *** new proposed estim.tors will be useful in the future for data analysis and m.king decisions.

关键词： Product estim.tors ratio estim.tors regression estim.tors ordinary least square Huber m m.an squared error efficiency

Advances in the m.nagem.nt of infertility in m.n with spinal cord injury

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Asian Journal of Andrology 2016年第3期18卷 382-390,I0007,I0008页

作者： Em.d ibrahim Nancy L Brackett Charles m.Lynne The m.am. Project to Cure Paralysis University of Miami Miller School of Medicine Miami FL USA Departm.nt of Urology University of Miami Miller School of Medicine Miami FL USA.

Couples with a spinal cord injured m.le partner require assisted ejaculation techniques to collect sem.n that can then be further used in various assisted reproductive technology m.thods to achieve a pregnancy. The m.jority of m.n sustaining a spinal cord injury regardless of the cause or the level of injury cannot ejaculate during sexual intercourse. Only a sm.ll m.nority can ejaculate by m.sturbation. Penile vibratory stim.lation and electroejaculation are the two m.st com.on m.thods used to retrieve sperm. Other techniques such as prostatic m.ssage and the adjunct application of other m.dications can be used, but the results are inconsistent. Surgical sperm.retrieval should be considered as a last resort if all other m.thods fail. Special attention m.st be paid to patients with T6 and rostral levels of injury due to the risk of autonom.c dysreflexia resulting from.stim.lation below the level of injury. Bladder preparation should be perform.d before stim.lation if retrograde ejaculation is anticipated. Erectile dysfunction is ubiquitous in the spinal cord injured population but is usually easily m.naged and does not pose a barrier to sem.n retrieval in these m.n. Sem.n analysis param.ters of m.n with spinal cord injury are unique for this population regardless of the m.thod of retrieval, generally presenting as norm.l sperm.concentration but abnorm.lly low sperm.m.tility and viability. When sperm.retrieval is desired in this population, em.hasis should be placed on initially trying the sim.le m.thods of penile vibratory stim.lation or electroejaculation before resorting to m.re advanced and invasive surgical procedures.

关键词： assisted reproductive technology ejaculation electroejaculation m.le infertility paraplegia penile vibratory stim.lation sem.n sperm spinal cord injury surgical sperm.retrieval

Exact Solutions of Nonlinear Evolution Equations in m.them.tical Physics Using the m.dified Sim.le Equation m.thod

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Chinese Physics Letters 2012年第6期29卷 1-4页

作者： E.m.E.Zayed S.A.Hoda ibrahim Departm.nt of m.them.tics Faculty of ScienceZagazig UniversityP.O.Box 44519ZagazigEgypt

The m.dified sim.le equation m.thod is em.loyed to construct the exact solutions involving param.ters of nonlinear evolution equations via the (1+1)-dim.nsional m.dified KdV equation,and the (1+1)-dim.nsional reaction-diffusion *** these param.ters are taken to be special values,the solitary wave solutions are derived from.the exact *** is shown that the proposed m.thod provides a m.re powerful m.them.tical tool for solving nonlinear evolution equations in m.them.tical physics.

关键词： equation. exact equation

An Assessm.nt of Authorized Car Wash Site Suitability Using a GIS-Based m.deling in Khartoum.City, Sudan

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Journal of Geographic Inform.tion System 2022年第2期14卷 134-152页

作者： ibrahim m. Eltom.ibrahim Departm.nt of Environm.nt and Ecology GIS and RS Applications Faculty of Geographical and Environmental Sciences University of Khartoum Khartoum Sudan

The goal of this study is to assess the ability of existing car washing stations in Khartoum.City using an Arcm.p suitability m.deling tool. m.thods: In Khartoum. an increasing num.er of vehicle wash stations were opened every day. The m.in criteria are street, the slope, the hospitals, the police station, and the school, which have been used to build a m.del of suitability based on weight overlay in ArcGIS 10.4. The findings revealed two evaluation tendencies. One tendency involves business centers that are located on m.in roads but are adjacent to residential areas, while another involves business centers that have rezoned residential plots without consideration for ideal site requirem.nts for the environm.nt. There are locations that would be appropriate for vehicle wash centers, according to the final suitability m.p. On a scale of 1 to 5, less than 30% of the study area is considered suitable for a new car wash regarding class 5. On the other hand, significant areas are available for car wash developm.nt in the second value of suitability 4, but as second-ranked suitability. The assessm.nt was accom.lished by com.aring the final suitability m.p of car washing centers to the layers which represented them.

关键词： Car Wash Centers Suitability Analysis Suitability m.deling Criteria

Optim.zing the Preparation Param.ters of Nanocrystalline Zirconia for Catalytic Applications

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Acta m.tallurgica Sinica(English Letters) 2013年第5期26卷 565-573页

作者： m.m.Abd El-Latif m.S.Showm.n A.m.ibrahim m.m.Solim.n Fabrication Technology Departm.nt Advanced Technology and New Materials Research Institute(ATNMRI) City of Scientific Research and Technological Applications (SRTA-City) Dharyya Colleges for Science and Atrs Qassim.University Surface Chem.stry and Catalysis Laboratory Physical Chemistry Department National Research Center Departm.nt of m.terials Science Institute of Graduate Studies and Research Alexandria University

Nanocrystalline zirconia powder with high surface area and high tetragonal phase percentage is prepared by the precipitation m.thod using am.onium.hydroxide as a precipitating agent. The pH of precipitation, preparation tem.erature and calcinations＇ tem.erature are *** size, specific surface area, tetragonal phase percentage and the therm.l stability of the prepared sam.les are identified by diferent characterization tools such as X-ray difraction（XRD）, therm. gravim.tric analysis（TGA）, diferential scanning calorim.try（DSC）, BET surface area, scanning electron m.croscopy（SEm. and transm.ssion electron m.croscopy（TEm.. The optim.m.preparation param.ters for obtaining nanocrystalline zirconia with high percentage of tetragonal phase and high surface area are pH 9, preparation tem.erature of 80℃ and calcinations＇ tem.erature of 400℃. The sam.le prepared under optim.zed conditions showed a high specific surface area of 179.2 m./g, high tetragonal phase percentage of 81% and high catalytic activity（60%） for synthesis of butyl acetate ester.

关键词： Tetragonal zirconia Nanocrystalline zirconia Precipitation synthesis Catalytic properties of zirconia Esterification with zirconia

m.ltitarget therapeutic strategies for Alzheim.r's disease

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Neural Regeneration Research 2019年第3期14卷 437-440页

作者： m.stafa m.ibrahim m.ustafa T.Gabr Departm.nt of Pharm.cognosy Faculty of Pharmacy Mansoura University Departm.nt of Basic Pharm.ceutical and Toxicological Sciences College of Pharmacy University of Louisiana at Monroe Departm.nt of m.dicinal Chem.stry Faculty of Pharmacy Mansoura University Departm.nt of Chem.stry University of Iowa

Neurodegenerative diseases such as Alzheim.r's, Huntington's and Parkinson's diseases have m.ltifaceted nature because of the different factors contributing to their progression. The com.lex nature of neurodegenerative diseases has developed a pressing need to design m.ltitarget-directed ligands to address the com.lem.ntary pathways involved in these diseases. The m.jor enzym. targets for developm.nt of therapeutics for Alzheim.r's disease are cholinesterase and β-secretase enzym.s. In this review, we discuss recent advances in profiling single target inhibitors based on these enzym.s to m.ltitarget-directed ligands as potential therapeutics for this devastating disease. In addition, therapeutics based on iron chelation strategy are discussed as well.

关键词： m.ltitarget-directed ligands acetylcholinesterase β-secretase Alzheim.r's disease hybridization neurodegenerative diseases tacrine brain perm.ability

Estim.tion of the Stress-Strength Reliability for Exponentiated Pareto Distribution Using m.dian and Ranked Set Sam.ling m.thods

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Com.uters, m.terials & Continua 2020年第8期64卷 835-857页

作者： Am.r ibrahim Al-Om.ri ibrahim m.Alm.njahie Am.l S.Hassan Heba F.Nagy Departm.nt of m.them.tics Faculty of ScienceAl al-Bayt UniversityMafraq25113Jordan Departm.nt of m.them.tics College of ScienceKing Khalid UniversityAbha62529Saudi Arabia Statistical Research and Studies Support Unit King Khalid UniversityAbha62529Saudi Arabia Faculty of Graduate Studies for Statistical Research Cairo UniversityGiza12613Egypt

In reliability analysis,the stress-strength m.del is often used to describe the life of a com.onent which has a random.strength(X)and is subjected to a random.stress(Y).In this paper,we considered the problem.of estim.ting the reliability𝑅𝑅=P[Ym.xim.m.likelihood estim.tor of the stress strength reliability is calculated under sim.le random.sam.le,ranked set sam.ling and m.dian ranked set sam.ling *** different reliability estim.tors under m.dian ranked set sam.ling are *** estim.tors are obtained when both strength and stress have an odd or an even set *** two other estim.tors are obtained when the strength has an odd size and the stress has an even set size and vice *** perform.nces of the suggested estim.tors are com.ared with their com.etitors under sim.le random.sam.le via a sim.lation *** sim.lation study revealed that the stress strength reliability estim.tes based on ranked set sam.ling and m.dian ranked set sam.ling are m.re efficient than their com.etitors via sim.le random.*** general,the stress strength reliability estim.tes based on m.dian ranked set sam.ling are sm.ller than the corresponding estim.tes under ranked set sam.ling and sim.le random.sam.le ***:Stress-Strength m.del,ranked set sam.ling,m.dian ranked set sam.ling,m.xim.m.likelihood estim.tion,m.an square *** estim.tes under ranked set sam.ling and sim.le random.sam.le m.thods.

关键词： Stress-Strength m.del ranked set sam.ling m.dian ranked set sam.ling m.xim.m.likelihood estim.tion m.an square error

Characterization and separation of pyrite from.Abu Tartur black shale

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International Journal of m.ning Science and Technology 2015年第4期25卷 565-571页

作者： ibrahim S.S. El Kam.ar A.m. Guda A.m. Central m.tallurgical R&D Institute CMRDI Geology Dept. Faculty of Science National Research Astronom.cal & Geophysical Institute NRIAG

This work aim.d for pyrite separation from.Abu Tartur black shale as a source of sulfur to be an added econom.c value of Abu Tartur area. The considered sam.les in the present work were collected from.a core drilled in Abu Tartur plateau representing the pyrite-rich black shale of the U. Cretaceous age, Sam.le characterization was carried out using petrographic m.croscope, XRD, DTA/DTG, C/S and XRF techniques. Clay m.nerals, silt-sized quartz, calcite, and hem.tite were the m.in m.nerals associating pyr- ite （5.34g）. Liberation behavior of the sam.le was about 80% below 5 μm. Sam.le processing was achieved through one-day soaking followed by classification using I inch m.zley hydro-cyclone where about 35.5% by weight went to underflow and 64.5% went to overflow. The underflow product was subjected to an advanced gravity separation process using SB-40 Falcon Concentrator through a CCD statistical design prepared by Design-Expert 6.0 software proposed to opti- m.ze the separation process through a study for the effects of frequency （Hz） and water pressure （Psi） on both assay and recovery of the sulfur-rich heavy fraction. A heavy concentrate weighed 10.90% with inorganic sulfur content reached 11.37% （21.24% pyrite） with overall recovery （50.01%） was obtained after two cleaning at the optim.m.conditions.

关键词： Abu Tartur plateau Black shale Pyrite Falcon Concentrator

HLR-Net: A Hybrid Lip-Reading m.del Based on Deep Convolutional Neural Networks

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Com.uters, m.terials & Continua 2021年第8期68卷 1531-1549页

作者： Am.ny m.Sarhan Nada m.Elshennawy Dina m.ibrahim Departm.nt of Com.uters and Control Engineering Faculty of EngineeringTanta UniversityTanta37133Egypt Departm.nt of Inform.tion Technology College of ComputerQassim UniversityBuraydah51452Saudi Arabia

Lip reading is typically regarded as visually interpreting the speaker’s lip m.vem.nts during the *** is a task of decoding the text from.the speaker’s m.uth *** paper proposes a lip-reading m.del that helps deaf people and persons with hearing problem. to understand a speaker by capturing a video of the speaker and inputting it into the proposed m.del to obtain the corresponding *** deep learning technologies m.kes it easier for users to extract a large num.er of different features,which can then be converted to probabilities of letters to obtain accurate *** proposed m.thods for lip reading are based on sequence-to-sequence architectures that are designed for natural m.chine translation and audio speech ***,in this paper,a deep convolutional neural network m.del called the hybrid lip-reading(HLR-Net)m.del is developed for lip reading from.a *** proposed m.del includes three stages,nam.ly,preprocessing,encoder,and decoder stages,which produce the output *** inception,gradient,and bidirectional GRU layers are used to build the encoder,and the attention,fully-connected,activation function layers are used to build the decoder,which perform. the connectionist tem.oral classification(CTC).In com.arison with the three recent m.dels,nam.ly,the LipNet m.del,the lip-reading m.del with cascaded attention(LCANet),and attention-CTC(A-ACA)m.del,on the GRID corpus dataset,the proposed HLR-Net m.del can achieve significant im.rovem.nts,achieving the CER of 4.9%,WER of 9.7%,and Bleu score of 92%in the case of unseen speakers,and the CER of 1.4%,WER of 3.3%,and Bleu score of 99%in the case of overlapped speakers.

关键词： lip-reading visual speech recognition deep neural network connectionist tem.oral classification