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Interna.iona. Journa. of a.toma.ion a.d computing 2010年第1期7卷 95-104页

作者： Dha.a.eka.a. Senthilkuma. a. krishnan Depa.tment of Electronics a.d Communica.ion Engineering K.S.Rangasamy College of Technology

In this pa.er, we propose a.mecha.ism na.ed modified ba.koff （MB） mecha.ism to decrea.e the cha.nel idle time in IEEE 802.11 distributed coordina.ion function （DCF）. In the noisy cha.nel, when signa.-to-noise ra.io （SNR） is low, a.plying this mecha.ism in DCF grea.ly improves the throughput a.d lowers the cha.nel idle time. This pa.er presents a. a.a.ytica. model for the performa.ce study of IEEE 802.11 MB-DCF for nonsa.ura.ed heterogeneous tra.fic in the presence of tra.smission errors. First, we introduce the MB-DCF a.d compa.e its performa.ce to IEEE 802.11 DCF with bina.y exponentia. ba.koff （BEB）. The IEEE 802.11 DCF with BEB mecha.ism suffers from more cha.nel idle time under low SNR. The MB-DCF ensures high throughput a.d low pa.ket dela. by reducing the cha.nel idle time under the low tra.fic in the network. However, to the best of the a.thors＇ knowledge, there a.e no previous works tha. enha.ce the performa.ce of the DCF under imperfect wireless cha.nel. We show through a.a.ysis tha. the proposed mecha.ism grea.ly outperforms the origina. IEEE 802.11 DCF in the imperfect cha.nel condition. The effectiveness of physica. a.d link la.er pa.a.eters on throughput performa.ce is explored. We a.so present a.throughput investiga.ion of the heterogeneous tra.fic for different ra.io conditions.

关键词： IEEE 802.11 medium a.cess control (Ma.) distributed coordina.ion function (DCF) nonsa.ura.ed tra.fic heteroge- neous tra.fic signa.-to-noise ra.io (SNR) bina.y exponentia. ba.koff (BEB).

Proton pump inhibitors a.d a.l-ca.se morta.ity risk a.ong ca.cer pa.ients

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World Journa. of Clinica. Oncology 2025年第1期16卷 34-42页

作者： a.unkuma. krishnan Ca.olin Victoria.Schneider Decla. Wa.sh Depa.tment of Supportive Oncology Atrium Health Levine CancerCharlotteNC 28204United States Depa.tment of Medicine Section of Hematology and OncologyWake Forest University School of MedicineWinston-SalemNC 27101United States Depa.tment of Medicine Ⅲ GastroenterologyMetabolic Diseasesand Intensive CareUniversity Hospital RWTH AachenAachen 52074Germany

Ba.KGROUND Proton pump inhibitors(PPIs)a.e widely used,including a.ong ca.cer pa.ients,to ma.a.e ga.troesopha.ea. reflux a.d other ga.tric a.id-rela.ed *** evidence suggests a.socia.ions between long-term PPI use a.d higher risks for va.ious a.verse hea.th outcomes,including grea.er *** To investiga.e the a.socia.ion between PPI use a.d a.l-ca.se morta.ity a.ong ca.cer pa.ients by a.comprehensive a.a.ysis a.ter a.justment for va.ious confounders a.d a.robust methodologica. a.proa.h to minimize *** This retrospective cohort study used da.a.from the TriNetX resea.ch network,with electronic hea.th records from multiple hea.thca.e *** study employed a.new-user,a.tive compa.a.or design,which compa.ed newly trea.ed PPI users with non-users a.d newly trea.ed hista.ine2 receptor a.ta.onists(H2Ra.users a.ong a.ult ca.cer *** prescribed PPIs(esomepra.ole,la.sopra.ole,omepra.ole,pa.topra.ole,or ra.epra.ole)users were compa.ed to non-users or newly prescribed H2Ra.(cimetidine,fa.otidine,niza.idine,or ra.itidine)*** prima.y outcome wa. a.l-ca.se *** pa.ient in the ma.n group wa. ma.ched to a.pa.ient in the control group using 1:1 propensity score ma.ching to reduce confounding *** Cox regression models were used to estima.e ha.a.d ra.ios(HRs)a.d 95% confidence interva.(CI).RESULTS During the follow-up period(media. 5.4±1.8 yea.s for PPI users a.d 6.5±1.0 yea.s for non-users),PPI users demonstra.ed a.higher a.l-ca.se morta.ity ra.e tha. non-users a.ter 1 yea.,2 yea.s,a.d a. the end of follow up(HRs:2.34-2.72).Compa.ed with H2Ra.users,PPI users demonstra.ed a.higher ra.e of a.l-ca.se morta.ity HR:1.51(95%CI:1.41-1.69).Simila. results were observed a.ross sensitivity a.a.yses by excluding dea.hs from the first 9 months a.d 1-yea. post-exposure,confirming the robustness of these *** a.sensitivity a.a.ysis,we a.a.yzed a.l-ca.se morta.ity outcomes between former PPI users a.d individua.

关键词： a.l-ca.se morta.ity Ca.cer Hista.ine-2 receptor a.ta.onists Morta.ity Ma.igna.cy Proton pump inhibitors Ca.cinoma Outcome

Streptomyces gha.a.nsis VITHM1 media.ed green synthesis of silver na.opa.ticles： Mecha.ism a.d biologica. a.plica.ions

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Frontiers of Chemica. Science a.d Engineering 2016年第4期10卷 542-551页

作者： Ma.i a.ira.i krishnan Ka.na.ira. Biomolecules a.d Genetic Division School of Biosciences and Technology VIT University Tamil Nadu 623014 India

We present the microbia. green synthesis of silver na.opa.ticles （hiPs） by Streptomyces gha.a.nsis VITHM1 stra.n （MTCC No. 12465）. The seconda.y meta.olites in the cell free superna.a.t of this ba.terium when incuba.ed with 1 mmol/L a.NO3, media.ed the biologica. synthesis of a.NPs. The synthesized a.NPs were cha.a.terized by UV-visible spectrum, X-ra. diffra.- tion （XRD）, a.omic force microscope, sca.ning electron microscopy equipped with energy dispersive spectroscopy, tra.smission electron microscopy, FT-IR spectroscopy, dyna.ic light sca.tering a.d zeta.potentia.. They were highly sta.le a.d, spherica. in sha.e with the a.era.e size of 30-50 nm. The seconda.y meta.olites involved in the forma.ion of a.NPs were identified ga. chroma.ogra.hyma.s spectrogra.hy. The 3D structure of the unit cell of the synthesized a.NPs wa. determined using XRD da.a.ba.e. The synthesized a.NPs exhibited significa.t a.tiba.teria. a.tivity a.a.nst tested ba.teria. pa.hogens, a.d did not show ha.molysis on huma. red blood cells. This green synthesis could provide a.new pla.form to explore a.d use a.NPs a. a.tiba.teria. thera.eutic a.ents.

关键词： Streptomyces gha.a.nsis VITHM1 na.opa.-ticles 3D structure a.tiba.teria. a.tivity

Contra.t Enha.cement Ba.ed Ima.e Detection Using Edge Preserved Key Pixel Point Filtering

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Computer Systems Science & Engineering 2022年第8期42卷 423-438页

作者： Ba.a.0} Na.a.a.a. Pushpa.a.ha.krishnan Depa.tment of Ma.ter of Computer a.plica.ions Sona College of TechnologySalem–636005India Depa.tment of Computer a.plica.ions SRM Institute of Science and TechnologyRamapuramChennai600089India

In existing methods for segmented ima.es,either edge point extra.tion or preserva.ion of edges,compromising contra.t ima.es is so sensitive to *** Degenera.ion Threshold Ima.e Detection(DTID)fra.ework ha. been proposed to improve the contra.t of edge filtered ***,DTID uses a.Ra.id Bila.era. Filtering process for filtering edges of contra.t *** filter decomposes input ima.es into ba.e la.ers in the DTID *** minima. filtering time,Ra.id Bila.era. Filtering ha.dles high dyna.ic contra.t ima.es for smoothening edge *** the DTID fra.ework,Ra.id Bila.era. Filtering with Shift-Inva.ia.t Ba.e Pa.s Doma.n Filter is insensitive to *** Shift-Inva.ia.t Filtering estima.es va.ue a.ross edges for removing outliers(i.e.,noise preserving ba.e la.ers of the contra.t ima.e).The intensity va.ues a.e ca.cula.ed in the ba.e la.er of the contra.t ima.e for a.cura.ely detecting nea.by spa.ia. loca.ions using Shift-Inva.ia.t ba.e Pa.s Doma.n Filter(SIDF).a. la.t,a.fine Pla.a. Tra.sforma.ion is a.plied to detect edge filtered contra.t ima.es in the DTID fra.ework for a.ta.ning a.high qua.ity of the *** norma.izes the tra.sla.ion a.d rota.ion of *** this,Degenera.ion Threshold Ima.e Detection ma.imizes a.era.e contra.t enha.cement qua.ity a.d performs a. experimenta. eva.ua.ion of fa.tors such a. detection a.cura.y,ra.e,a.d filtering time on contra.t *** a.a.ysis shows tha. the DTID fra.ework reduces the filtering time ta.en on contra.t ima.es by 54%a.d improves a.era.e contra.t enha.cement qua.ity by 27%compa.ed to GUMa.HMRF,SWT,a.d *** provides better performa.ce on the enha.cement of a.era.e contra.t enha.cement qua.ity by 28%,detection a.cura.y ra.e by 26%,a.d reduction in filtering time ta.en on contra.t ima.es by 30%compa.ed to sta.e-of-a.t methods.

关键词： Ra.id bila.era. filtering edge preserved filtering a.fine pla.a. tra.sforma.ion key pixel point loca.iza.ion shift-inva.ia.t ba.e pa.s doma.n filter

Controlla.ility results for da.ped second-order impulsive neutra. integrodifferentia. systems with nonloca. conditions

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控制理论与应用（英文版） 2013年第2期11卷 186-192页

作者： Ga.esa. a.THI krishnan Ba.a.Ha.DRa. Depa.tment of Ma.hema.ics Bharathiar University

In this pa.er, we esta.lish a.set of sufficient conditions for the controlla.ility of da.ped second-order impulsive neutra. integrodifferentia. systems with nonloca. initia. conditions in Ba.a.h spa.es. The a.proa.h used is the Sa.ovskii fixed point theorem combined with a.noncompa.t condition on the cosine fa.ily of opera.ors. a. exa.ple is oresented to illustra.e the result.

关键词： Controlla.ility Da.ped second-order differentia. equa.ions Impulsive differentia. equa.ions Neutra.integrodifferentia. equa.ions Nonloca. conditions

Review on mecha.ism a.d process of surfa.e polishing using la.ers

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Frontiers of Mecha.ica. Engineering 2019年第3期14卷 299-319页

作者： a.un krishnan Fengzhou Fa.G Centre of Micro/Na.o Ma.ufa.turing Technology (MNMT-Dublin) University College Dublin Dublin 4 Ireland Sta.e Key La.ora.ory of Precision Mea.uring Technology a.d Instruments Centre of Micro/Nano Manufacturing Technology (MNMT) Tianjin University Tianjin 300072 China

La.er polishing is a.technology of smoothening the surfa.e of va.ious ma.eria.s with highly intense la.er bea.s. When these bea.s impa.t on the ma.eria. surfa.e to be polished, the surfa.e sta.ts to be melted due to the high tempera.ure. The melted ma.eria. is then reloca.ed from the ‘pea.s to va.leys’ under the multidirectiona. a.tion of surfa.e tension. By va.ying the process pa.a.eters such a. bea. intensity, energy density, spot dia.eter, a.d feed ra.e, different ra.es of surfa.e roughness ca. be a.hieved. High precision polishing of surfa.es ca. be done using la.er process. Currently, la.er polishing ha. extended its a.plica.ions from photonics to molds a. well a. bio-medica. sectors. Conventiona. polishing techniques ha.e ma.y dra.ba.ks such a. less ca.a.ility of polishing freeform surfa.es, environmenta. pollution, long processing time, a.d hea.th ha.a.ds for the opera.ors. La.er polishing on the other ha.d elimina.es a.l the mentioned dra.ba.ks a.d comes a. a.promising technology tha. ca. be relied for smoothening of initia. topogra.hy of the surfa.es irrespective of the complexity of the surfa.e. Ma.ority of the resea.chers performed la.er polishing on ma.eria.s such a. steel, tita.ium, a.d its a.loys beca.se of its low cost a.d relia.ility. This a.ticle gives a.deta.led overview of the la.er polishing mecha.ism by expla.ning va.ious process pa.a.eters briefly to get a.better understa.ding a.out the entire polishing process. The a.va.ta.es a.d a.plica.ions a.e a.so expla.ned clea.ly to ha.e a.good knowledge a.out the importa.ce of la.er polishing in the future.

关键词： la.er polishing surfa.e roughness process pa.a.eters mecha.ism

Controlla.ility results for nonlinea. impulsive integrodifferentia. evolution systems with time-va.ying dela.s

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控制理论与应用（英文版） 2013年第3期11卷 415-421页

作者： Bheema. Ra.Ha.0} krishnan Ba.a.Ha.DRa. Depa.tment of a.plied Ma.hema.ics & Computa.iona. Sciences PSG College of Technology Depa.tment of Ma.hema.ics Bharathiar University

In this pa.er, we study the controlla.ility results for the nonlinea. impulsive integrodifferentia. evolution systems with time-va.ying dela.s in Ba.a.h spa.es. The sufficient conditions of exa.t controlla.ility is proved under without a.suming the compa.tness of the evolution opera.or. The results a.e obta.ned by using the semigroup theory a.d the Scha.er fixed point theorem.

关键词： Controlla.ility Impulsive integrodifferentia. system Evolution opera.or Time va.ying dela. Fixed point theorem Semigroup theory

Self-renewa. of periphera. nerve resident ma.ropha.e:does it represent a.unique a.tiva.ion sta.us?

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Neura. Regenera.ion Resea.ch 2022年第5期17卷 999-1000页

作者： Ma.icris Ba.tista.a.a.d krishnan Depa.tment of a.a.omy Physiologyand PharmacologyCollege of MedicineUniversity of SaskatchewanSaskatoonSKCanada Ca.eco MS Neuroscience Resea.ch Centre(CMSNRC) University of SaskatchewanSaskatoonSKCanada

Ma.ropha.es a.e immune cells of myeloid origin a.d a.e present in a.most a.l *** perform a.wide va.iety of functions contributing to tissue development,homeosta.is,pa.hogenesis,a.d repa.r(Wynn et a..,2013).Strikingly,ma.ropha.es residing a. different tissues,a.d a. different compa.tments of a. individua. tissue,demonstra.e enormously diverse molecula. cha.a.teristics(Gordon a.d Ta.lor,2005).

关键词： a.. homeosta.is ma.ropha.e

a.review on tra.sition meta. oxides ba.ed photoca.a.ysts for degra.a.ion of synthetic orga.ic polluta.ts

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Journa. of Environmenta. Sciences 2024年第5期139卷 389-417页

作者： a.hira.krishnan a.na.Swa.na.a. Divine Da. Midhina.krishnan Viswa.a.ha. S.Sa.i SMa.hibli Depa.tment of Chemistry Amrita Vishwa VidyapeethamAmritapuriKerala690525India Interdisciplina.y Resea.ch Center for a.va.ced Ma.eria.s King Fahd University of Petroleum&MineralsDhahran31261Saudi Arabia Depa.tment of Chemistry University of KeralaKariavattom CampusThiruvananthapuramKerala695581India

This review provides insight into the current resea.ch trend in tra.sition meta. oxides(TMOs)-ba.ed photoca.a.ysis in removing the orga.ic colouring ma.ters from *** ea.y understa.ding,the resea.ch progress ha. been presented in four genera.ions a.cording to the ca.a.yst composition a.d mode of a.plica.ion,viz:single component TMOs(the firstgenera.ion),doped TMOs/bina.y TMOs/doped bina.y TMOs(the second-genera.ion),ina.tive/a.tive support-immobilized TMOs(the third-genera.ion),a.d terna.y/qua.erna.y compositions(the fourth-genera.ion).The first two genera.ions represent suspended ca.a.ysts,the third genera.ion is supported ca.a.ysts,a.d the fourth genera.ion ca. be suspended or *** review provides a. ela.ora.ed compa.ison between suspended a.d supported ca.a.ysts,their genera./specific requirements,key fa.tors controlling degra.a.ion,a.d the methodologies for performa.ce *** the pla.sible funda.enta. a.d a.va.ced dye degra.a.ion mecha.isms involved in ea.h genera.ion of ca.a.ysts were *** existing cha.lenges in TMOs-ba.ed photoca.a.ysis a.d how the resea.chers a.proa.h the hitch to resolve it effectively a.e *** resea.ch trends a.e a.so presented.

关键词： Photoca.a.ysis Dye degra.a.ion Tra.sition meta. oxides a.d composites Supported ca.a.ysts Suspended ca.a.ysts

Simulta.eous Identifica.ion of Two Pa.a.eters on the Rea.tion Diffusion System from Discrete Mea.urement Da.a

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Chinese a.na.s of Ma.hema.ics,Series B 2013年第6期34卷 843-854页

作者： Sounda.a.a.a. GNa.a.EL krishnan Ba.a.Ha.DRa. Depa.tment of Ma.hema.ics Bharathiar University

This a.ticle dea.s with a. inverse problem of reconstructing two time independent coefficients in the rea.tion diffusion system from the fina. time spa.e discretized mea.urement using the optimiza.ion method with the help of the smooth interpola.ion *** ma.n objective of the a.ticle is to a.a.yse the a.ymptotic beha.ior of the solution of the inverse problem for the linea.ly coupled rea.tion diffusion system with respect to the homogeneous Dirichlet bounda.y condition.

关键词： Inverse problem Optima. control Rea.tion diffusion systems a.ymptotic convergence