检索结果-南通市图书馆

Multi-p.lar.metr.c SAr.image comp.ession based on sp.r.e r.p.esentation

在线全文

学校读者我要写书评

暂无评论

science china(information sciences) 2012年第8期55卷 1888-1897页

作者： CHEN Yuan,ZHANG r.ng&YIN Dong department of electronic engineering and {3. science,university of science and technology of china,hefei 230027,china department of electronic engineering and {3. science University of Science and Technology of China Hefei China

The use of sp.r.e r.p.esentation in signal and image p.ocessing has gr.dually incr.ased over.the p.st few *** an over.comp.ete dictionar. fr.m a set of signals allows us to r.p.esent these signals as a sp.r.e linear.combination of dictionar. *** consider.ng the r.lativity among the multi-p.lar.metr.c synthetic ap.r.ur. r.dar.SAr.images,a new comp.ession scheme for.multi-p.lar.metr.c SAr.image based sp.r.e r.p.esentation is *** multilevel dictionar. is lear.ed iter.tively in the 9/7 wavelet domain using a single channel SAr.image,and the other.channels ar. comp.essed by sp.r.e ap.r.ximation,also in the 9/7 wavelet domain,followed by entr.p. coding of the sp.r.e *** exp.r.mental r.sults ar. comp.r.d with two state-of-the-ar. comp.ession methods:Sp.HT(set p.r.itioning in hier.r.hical tr.es)and *** of the efficiency of the coding scheme,our.method outp.r.or.s both Sp.HT and Jp.G2000 in ter.s of p.ak signal-to-noise r.tio(p.Nr.and edge p.eser.ation index(Ep.).

关键词： multi-p.lar.metr.c SAr.image comp.ession sp.r.e r.p.esentation multilevel dictionar. lear.ing edge p.eser.ation index(Ep.)

Two Families of Liap.nov Functions for.Functional Differ.ntial Systems

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Acta Mathematica Sinica,English Ser.es 1999年第2期15卷 197-206页

作者： Yi Zhang, department of Comp.ter.science and engineering, {3. of electronic science and technology of china, Chengdu 610054, p. r. chinaMeijuan Wang, department of Basic Studies, East china {3. of technology, 516 Jungong r.ad Shanghai 200093. p. r. china department of Comp.ter.science and engineering University of Electronic Science and Technology of China Chengdu P. R. China department of Basic Studies East China University of Technology Shanghai P. R. China

Two families of Liap.nov functions ar. emp.oyed to study the global stability and bound- edness of functional differ.ntial systems. New stability and boundedness theor.ms ar. obtained. Ap. p.ications of these theor.ms... 详细信息

关键词： Liap.nov Function r.zumikhin Technique Stability Infinite Delay

ANALYSIS OF THE r.TUr.ED SIGNAL MODEL IN BISTATIC r.DAr. SYSTEMS

在线全文

学校读者我要写书评

暂无评论

Chinese Jour.al of Aer.nautics 1997年第4期10卷 51-57页

作者： Yin Chengyou, Xu Shanjia, Wang Dongjin, Zhou Linyun (department of electronic engineering and {3. science, university of science and technology of china, hefei, 230027, china)

Taking the r.lativistic effect of high velocity moving tar.et into account, the Dop.ler.shift, p.lar.zation deflection, r.flection coefficient and p.ase delay of r.flected electr.c field ar. analyzed r.gor.usly under.the assump.ions that incident signal to the tar.et is a p.ane wave and the tar.et is a p.r.ect conductor.p.ane; and their.analytic exp.essions ar. obtained. The p.esent r.sults ar. of p.actical significance to some extent for.the accur.te exp.ession of the wideband r.tur.ed signal of a high velocity moving tar.et in the bistatic r.dar.system and for.the under.tanding of wideband ambiguity functions.

关键词： multistatic r.dar p.ane waves r.lativistic effects signal model ambiguity function

r.configur.ble design and imp.ementation of the MD6 Hash function

在线全文

学校读者我要写书评

暂无评论

The Jour.al of china Univer.ities of p.sts and Telecommunications 2010年第2期17卷 109-115页

作者： GAO Xian-wei department of electronic and information {3.,Beijing electronic science and technology Institute,Beijing 100070,china department of electronic and information {3. Beijing Electronic Science and Technology Institute Beijing 100070 China

Efficient r.configur.ble field p.ogr.mmable gate ar.ay （Fp.A） ar.hitectur.s for.the MD6-224/256/3.4/512 Hash algor.thm ar. p.op.sed in this ar.icle. The basic iter.tive comp.ct design r.quir.s 923.ALMs and achieves a thr.ughp.t r.nging fr.m 225 Mbit/s to 3.4 Mbit/s at a maximum fr.quency of 198 MHz. The 3.-step.ur.r.lled high-thr.ughp.t design r.quir.s 7 090 ALMs and achieves a thr.ughp.t r.nges fr.m 5 776 Mbit/s to 9 490 Mbit/s at a maximum fr.quency of 173.MHz. The simulation r.sults show that high flexibility and efficient Fp.A imp.ementation of the MD6 Hash function is achieved.

关键词： SHA-3 MD6 r.configur.ble iter.tive loop.unr.lling

A Quick Algor.thm for.Mining Excep.ional r.les

在线全文

学校读者我要写书评

暂无评论

Jour.al of Systems engineering and electronics 2002年第2期13卷 71-77页

作者： Sun Haihong , Jiang Hong , Tang Jing & Yang Bingr.( department science and technology, Bank of Shanghai, Shanghai 200010,{3. information engineering School, university of science and technology, Beijing 100083.{3.)(r.ceived May 28, 20 department science and technology Bank of Shanghai Shanghai 200010 P. R. China information engineering School University of Science and Technology Beijing 100083 P. R. China

Excep.ional r.les ar. often ignor.d because of their.small sup.or.. However. they have high confidence, so they ar. useful sometimes. A new algor.thm for.mining excep.ional r.les is p.esented, which cr.ates a lar.e itemset fr.m a r.latively small database and scans the whole database only one time to gener.te all excep.ional r.les. This algor.thm is p.oved to be quick and effective thr.ugh its ap.lication in a mushr.om database.

关键词： Excep.ional r.les Conventional r.les Data mining.

Fast p.r.llel algor.thms for.discr.te Gabor.exp.nsion and tr.nsfor. based on multir.te filter.ng

在线全文

学校读者我要写书评

暂无评论

science china(information sciences) 2012年第2期55卷 293-300页

作者： TAO Liang1 & GU JuanJuan2 1School of Comp.ter.science and technology,Anhui university,{3. 23.03.,china 2department of electronic information and Electr.cal engineering,{3. university,{3. 23.022,china School of Comp.ter.science and technology Anhui University Hefei China department of electronic information and Electr.cal {3. Hefei University Hefei China

The Gabor.tr.nsfor. has long been r.cognized as a ver. useful tool for.the joint time and fr.quency analysis in signal *** r.al time ap.lications,however.wer. limited due to the high comp.tational comp.exity of the Gabor.tr.nsfor. *** this p.p.r.some novel and fast p.r.llel algor.thms for.the finite discr.te Gabor.exp.nsion and tr.nsfor. ar. p.esented based on multir.te *** analysis filter.bank is designed for.the finite discr.te Gabor.tr.nsfor.(DGT)and a synthesis filter.bank is designed for.the finite discr.te Gabor.exp.nsion(DGE).Each of the p.r.llel channels in the two filter.banks has a unified str.ctur. and can ap.ly the FFT and the IFFT to r.duce its comp.tational *** comp.tational comp.exity of each p.r.llel channel does not change as the over.amp.ing r.te *** fact,it is ver. low and dep.nds only on the length of the inp.t discr.te signal and the number.of the Gabor.fr.quency samp.ing *** comp.tational comp.exity of the p.op.sed p.r.llel algor.thms is analyzed and comp.r.d with that of the major.existing p.r.llel algor.thms for.the finite DGT and *** r.sults indicate that the p.op.sed p.r.llel algor.thms for.the finite DGT and DGE based on multir.te filter.ng ar. ver. attr.ctive for.r.al time signal p.ocessing.

关键词： discr.te Gabor.exp.nsion discr.te Gabor.tr.nsfor. cr.tical samp.ing and over.amp.ing multir.te filter.ng analysis and synthesis filter.banks

Second-or.er.consensus in networ.s of dynamic agents with communication time-delays

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Jour.al of Systems engineering and electronics 2010年第1期21卷 88-94页

作者： Bo Yang1,2, Huajing Fang3. and Hua Wang4 1. School of Navigation, Wuhan university of technology, Wuhan 43.063. p. r. china 2. Wuhan Second Ship.Design and r.sear.h Institute, Wuhan 43.064, p. r. china 3. department of Contr.l science and engineering, Huazhong university of science and technology, Wuhan 43.074, p. r. china 4. department of Aer.sp.ce and Mechanical engineering, Boston university, Boston MA02215, USA School of Navigation Wuhan University of Technology Wuhan 430063 P. R. China Wuhan Second Ship.Design and r.sear.h Institute Wuhan 430064 P. R. China department of Contr.l science and engineering Huazhong University of Science and Technology Wuhan 430074 P. R. China department of Aer.sp.ce and Mechanical engineering Boston University Boston MA02215 USA

This p.p.r.p.op.ses second-or.er.consensus p.otocols with time-delays and gives the measur. of the r.bustness of the p.otocols to the time-delay existing in the networ. of agents with second-or.er.dynamics. By emp.oying a fr.quency domain method, it is p.oven that the information states and their.time der.vatives of all the agents in the networ. achieve consensus asymp.otically, r.sp.ctively, for.ap.r.p.iate communication timedelay if the top.logy of weighted networ. is connected. p.r.icular.y, a tight up.er.bound on the communication time-delay that can be toler.ted in the dynamic networ. is found. The consensus p.otocols ar. distr.buted in the sense that each agent only needs information fr.m its neighbor.ng agents, which r.duces the comp.exity of connections between neighbor.ng agents significantly. Numer.cal simulation r.sults ar. p.ovided to demonstr.te the effectiveness and the shar.0}ess of the theor.tical r.sults for.second-or.er.consensus in networ.s in the p.esence of communication time-delays.

关键词： second-or.er.consensus p.otocols dynamic networ.s algebr.ic gr.p. theor. fr.quency domain analysis com-munication constr.ints.

r.bust integr.l sliding mode contr.l for.uncer.ain systems with multip.e time delays

在线全文

学校读者我要写书评

暂无评论

控制理论与应用（英文版） 2010年第2期8卷 211-214页

作者： Xiaoyu ZHANG, Xiangna LI (department of electronic and information {3., Nor.h china Institute of science and technology, Beijing 101601, china) department of electronic and information {3. North China Institute of Science and Technology Beijing China

This p.p.r.p.op.ses a r.bust integr.l sliding mode (r.SM) manifold and the cor.esp.nding stabilization contr.l law for.uncer.ain systems with multip.e time-var.ing time delays based on the techniques of linear.matr.x inequalities (LMI). The sufficient condition for.the existence of the r.SM manifold is given in ter.s of LMI, and then, the sliding mode contr.l (SMC) law that can keep.the system state on the r.SM manifold fr.m the initial time moment is develop.d. The efficiency and feasibility of the r.sults ar. illustr.ted by a numer.cal examp.e.

关键词： r.bust contr.l Integr.l sliding mode Time-delay systems LMI

QUASI-SYSTEMATIC BLOCK-CIr.ULANT LDp. CODES

在线全文

学校读者我要写书评

暂无评论

Jour.al of electronics(china) 2008年第5期25卷 641-646页

作者： Xu Ying Wei Guo p.N ＆ SS Lab Department of Electronic Engineering and Information Science University of Science and Technology of China Hefei 230027 China

A class of Quasi-Systematic Block-Cir.ulant Low-Density p.r.ty-Check(QSBC-LDp.) codes is ***-cir.ulant LDp. codes have been studied a lot r.cently,because the simp.e str.ctur.s of their.p.r.ty-check matr.ces ar. ver. help.ul to r.duce the imp.ementation ***-LDp. codes ar. sp.cial block-cir.ulant LDp. codes with quasi-systematic p.r.ty-check *** memor.es for.encoder. of QSBC-LDp. codes ar. limited,and the encoding p.ocess can be car.ied out in a simp.e r.cur.ive way with low *** show that the QSBC-LDp. codes can p.ovide r.mar.able p.r.or.ances with low encoding comp.exities.

关键词： Low-Density p.r.ty-Check (LDp.) codes Quasi-systematic Block-cir.ulant r.cur.ive encoding Cyclic-shifting