简介：Indownlinkcoordinatedmulti-point(CoMP)system,fullcooperationisalwaysnotapplicableinrealworldbecauseofitshighrequestinthebackhaul.Todealwiththisproblem,clusteringdecisionismadetoprocesstransmission.Inthispaperclusteringmethodsbasedonthemetricsignal-to-leakage-plus-noise(SLNR)isproposed.Inaddition,userschedulingschemesbasedonSLNRisalsoputuptomaketheschedulingsetaslargeaspossible.Simulationresultsshowthattheproposedclusteringmethodsnotonlyreducethedatasharingamongthecooperatingbasestations(BSs),butalsoimprovethesystemthroughputcomparedwiththetraditionalclusteringmethodsbasedonchannelstrength.

简介：Orthogonalfrequencydivisionmultiplexing(OFDM)whichhasbeenadoptedinthelong-termevolution(LTE)systemcanimprovethesystemcapacityobviously.However,italsobringsaboutsevereinter-cellinterference(ICI)forcell-edgeusers(CEUs).Totacklethisproblem,multi-userselectionandpowercontrol(MuS-PC)isproposedasanefficientschemeinuplinkcoordinatedmulti-pointmulti-usermulti-inputmulti-output(CoMP-MU-MIMO)transmission/reception.Thispaperjointlyconsidersuser’ssignaltointerferenceplusnoiseratio(SINR)andproportionalfairness(PF)tomaximizethetotalchannelcapacityinmulti-userselectionbyformulatingapenaltyfunction.Tosimplifythepenaltyfunction’scomputation,particleswarmoptimization(PSO)algorithmisintroduced.Inaddition,powercontrolisadoptedtomaximizeoverallenergyefficiency.SimulationresultsdemonstratethattheMuS-PCschemecannotonlyobtaintheoptimaltotalchannelcapacitywhileguaranteeeachuser’squalityofservice(QoS)andPF,butalsolargelyreducecomputationalcomplexityandimproveenergyefficiency.Asaresult,thepoorcommunicationqualityofCEUscanbeenhanced.

简介：Coordinatedmulti-pointtransmission/reception(CoMP)wasproposedcurrentlyasaneffectivetechnologytoimprovecell-edgethroughputinnext-generationwirelesssystems.Mostoftheexistingworkdiscussedclusteringmethodsmostlytomaximizetheedgeuserthroughputwhileneglectingtheproblemofenergyefficiency,suchasthosealgorithmclusteringbasestations(BSs)ofbetterchannelconditionandBSsofworsechannelconditiontogether.Inaddition,BSsusuallyincreasethetransmitpowertoachievehigherthroughputwithoutanyconsideringofinterferencecausedtootherusers,thatmayresultinenergywaste.TheauthorsfocusonthethroughputmaximizingproblemwhilefullyconsideringenergysavingprobleminCoMPsystems.Acoefficientisdefinedtodescribethefitnessofclusters.Thenasub-carrierallocationalgorithmwithclusteringmethodisputforwardforCoMPdownlink,whichcansavethetransmitpowerofBSandincreasethethroughput.Furthermoreapowerallocationschemeisproposedbasedonnon-cooperationgame;inwhichthetransmitpowerisdecreasedbyBSsgenerallytoreachtheNashequation(NE).Simulationshowsthattheproposedsub-carrierallocationschemeandpowerallocationalgorithmarebetterthantheexistingonesonusers’throughputwhileconsumesmuchlessenergy.

简介：目的探讨玻璃酸钠注射液对膝骨关节炎（KOA）患者的治疗效果，及其对关节液中软骨寡聚基质蛋白（COMP）及基质金属蛋白酶-13（MMP-13）浓度的影响。方法选取自2013年1月至2014年1月KOA患者100例，随机分为对照组和观察组，每组各50例。两组患者均接受关节腔内药物注射治疗，对照组患者给予糖皮质激素，观察组患者给予玻璃酸钠，两组患者均治疗1个疗程。评价两组患者治疗后的疗效，分别于治疗前后采用美国特种外科医院膝关节评分（HSS）标准对患者进行评分，检测两组患者治疗前后关节液中COMP、MMP-13的浓度，对收集到的数据进行统计学分析。结果两组患者治疗前后的HSS膝关节评分存在明显差异，治疗后HSS膝关节评分较治疗前明显增加（P〈0．05），且观察组增加幅度更大；两组患者治疗后的总有效率分别为76．O％、92．0％，观察组总有效率明显高于对照组（P〈0．05）；治疗前，两组患者关节液中COMP、MMP-13浓度比较差异无统计学意义（P〉0．05）；治疗后，观察组关节液中COMP、MMP-13浓度分别为（3．2±1.3）ng／ml、（352．7±48．4）μg／L，对照组关节液COMP、MMP．13浓度分别为（3．8±1．4）ng／ml、（416．4±52．5）μm，两种物质的表达水平均较治疗前明显降低（P〈0．05），且观察组降低幅度更为显著，治疗后的COMP、MMP-13浓度与对照组比较差异有统计学意义（P〈0．05）。结论玻璃酸钠关节腔内注射治疗KOA的疗效确切，总有效率明显提高，且治疗后关节液中COMP、MMP-13的分泌表达受到明显抑制，有助于促进软骨的修复，对病情的延缓及生活质量的提高十分有利。

简介：摘要：目的：分析和研究温针灸联合小针刀治疗膝关节炎的疗效及血清MMP-9（血清基质金属蛋白酶-9）、TIMP-1（金属蛋白酶组织抑制因子）、COMP（寡聚基质蛋白）水平变化。方法：所选病例是2021年4月到2022年12月前来我院就诊的膝关节炎患者共计有80例，随机分为两组，对照组和特殊组，各为40例；对照组予以温针灸治疗，特殊组施行温针灸联合小针刀治疗，对照治疗结果。结果：特殊组总有效率比对照组高，数据有差异（P0.05），治疗后，特殊组血清MMP-9、TIMP-1、COMP水平分比对照组低，数据有差异（P