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Missing Da.a.Imputa.ion: a.Comprehensive Review

Journa. of Computer a.d Communica.ions 2024年第11期12卷 53-75页

作者： Ma.ed a.wa.eer El-Sa.ed a.la. Ma.moud Moha.med a.d El-Ra.uf osama a. ghoneim Ibra.im Ga. Depa.tment of Computer Science College of Computer Science and Engineering Taibah University Yanbu Saudi Arabia Computer Science Depa.tment Faculty of Science Tanta University Tanta Egypt Ba.ic a.d a.plied Science Institute College of Engineering and Technology Arab Academy for Science and Technology (AAST) Alexandria Egypt Depa.tment of Computer Science Faculty of Computers and informatics Tanta University Tanta Egypt

Missing da.a.presents a.significa.t cha.lenge in sta.istica. a.a.ysis a.d ma.hine lea.ning, often resulting in bia.ed outcomes a.d diminished efficiency. This comprehensive review investiga.es va.ious imputa.ion techniques, ca.egorizing them into three prima.y a.proa.hes: deterministic methods, proba.ilistic models, a.d ma.hine lea.ning a.gorithms. Tra.itiona. techniques, including mea. or mode imputa.ion, regression imputa.ion, a.d la.t observa.ion ca.ried forwa.d, a.e eva.ua.ed a.ongside more contempora.y methods such a. multiple imputa.ion, expecta.ion-ma.imiza.ion, a.d deep lea.ning stra.egies. The strengths a.d limita.ions of ea.h a.proa.h a.e outlined. Key considera.ions for selecting a.propria.e methods, ba.ed on da.a.cha.a.teristics a.d resea.ch objectives, a.e discussed. The importa.ce of eva.ua.ing imputa.ion’s impa.t on subsequent a.a.yses is empha.ized. This synthesis of recent a.va.cements a.d best pra.tices provides resea.chers with a.robust fra.ework for effectively ha.dling missing da.a. thereby improving the relia.ility of empirica. findings a.ross diverse disciplines.

关键词： Missing Da.a Ma.hine Lea.ning Prediction Deep Lea.ning Imputa.ion

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a. Optimized a.proa.h for Spectrum Utiliza.ion in mmWa.e Ma.sive MIMO 5G Wireless Networks

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Computer Systems Science & Engineering 2023年第11期47卷 1493-1505页

作者： Elsa.d Md.a.delra.im Mona.a.dua.lij Ma. a.dua.lij Roma.y F.Ma.sour osama a.ghoneim Fa.ulty of Science Northern Border UniversityArarSaudi Arabia Fa.ulty of Science Tanta UniversityTantaEgypt Computer Sciences Depa.tment College of Computer and Information SciencesPrincess Nourah Bint Abdulrahman UniversityRiyadhSaudi Arabia Depa.tment of Ma.hema.ics Faculty of ScienceNew Valley UniversityEl-Kharga72511Egypt Fa.ulty of Computers a.d Informa.ion Tanta UniversityEl-GieshEgypt

Ma.sive multiple-input multiple-output(MIMO)systems tha. use the millimeter-wa.e(mm-wa.e)ba.d ha.e a.higher frequency a.d more a.tenna.,which lea.s to significa.t pa.h loss,high power consumption,a.d server *** to these issues,the spectrum efficiency is significa.tly reduced,ma.ing spectra. efficiency improvement a. importa.t resea.ch topic for 5G *** with communica.ion in the tera.ertz(THz)ba.ds,mmWa.e communica.ion is currently a.component of the 5G sta.da.ds a.d is seen a. a.solution to the commercia. ba.dwidth *** qua.tity of continuous,mostly unta.ped ba.dwidth in the 30–300 GHz ba.d ha. presented a.ra.e opportunity to boost the ca.a.ity of wireless *** wireless communica.ions a.d consumer electronics industries ha.e recently pa.d a.lot of a.tention to wireless da.a.tra.sfer a.d media.strea.ing in the mmWa.e frequency *** ma.sive MIMO bea.forming technology ca.not successfully prevent interference between multiple networks in the current spectrum-sha.ing schemes,pa.ticula.ly the complex interference dispersed in indoor communica.ion systems such a. homes,workpla.es,a.d *** effectively improve spectrum utiliza.ion a.d reduce co-cha.nel interference,this pa.er proposes a.novel *** ma.n idea.is to utilize the spectrum in softwa.e-defined mmWa.e ma.sive MIMO networks through coordina.ed a.d unified ***,the optima. interference threshold is determined through the bea. a.ignment ***,a.greedy optimiza.ion a.gorithm is used to a.loca.e optima. spectra. resources to the *** results show tha. the proposed a.gorithm improved spectra. efficiency a.d reduced interference.

关键词： mmWa.e ma.sive MIMO 5G networks SDN spectra. efficiency

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