检索结果-南通市图书馆

Nonlinear feedback synchronization of hyperchaos in higher dimensional systems

在线全文

学校读者我要写书评

暂无评论

Nuclear science and techniques 1997年第4期 1-7页

作者： Fang Jin Qing ( China Institute of Atomic Energy, Beijing 102413) Ali m k ( department of Physics, the university of lethbridge,lethbridge, Alberta t1k 3m4, canada)

ＮｏｎｌｉｎｅａｒｆｅｅｄｂａｃｋｓｙｎｃｈｒｏｎｉｚａｔｉｏｎｏｆｈｙｐｅｒｃｈａｏｓｉｎｈｉｇｈｅｒｄｉｍｅｎｓｉｏｎａｌｓｙｓｔｅｍｓＦａｎｇＪｉｎＱｉｎｇ（ＣｈｉｎａＩｎｓｔｉｔｕｔｅｏｆＡｔｏｍｉｃＥｎ... 详细信息

ＮｏｎｌｉｎｅａｒｆｅｅｄｂａｃｋｓｙｎｃｈｒｏｎｉｚａｔｉｏｎｏｆｈｙｐｅｒｃｈａｏｓｉｎｈｉｇｈｅｒｄｉｍｅｎｓｉｏｎａｌｓｙｓｔｅｍｓＦａｎｇＪｉｎＱｉｎｇ（ＣｈｉｎａＩｎｓｔｉｔｕｔｅｏｆＡｔｏｍｉｃＥｎｅｒｇｙ，Ｂｅｉｊｉｎｇ１０２４１...

关键词： Hyperchaos Synchronization Nonlinear feedback functions ten dimension.

Synchronizing spatiotemporal chaos in the coupled map lattices using nonlinear feedback functions

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Nuclear science and techniques 1997年第3期 1-7页

作者： Fang Jin Qing ( China Institute of Atomic Energy, Beijing 102413) m k Ali △ ( department of Physics, the university of lethbridge,lethbridge, Alberta t1k 3m4, canada)

ＳｙｎｃｈｒｏｎｉｚｉｎｇｓｐａｔｉｏｔｅｍｐｏｒａｌｃｈａｏｓｉｎｔｈｅｃｏｕｐｌｅｄｍａｐｌａｔｉｃｅｓｕｓｉｎｇｎｏｎｌｉｎｅａｒｆｅｄｂａｃｋｆｕｎｃｔｉｏｎｓＴｈｅｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙｆｕ... 详细信息

ＳｙｎｃｈｒｏｎｉｚｉｎｇｓｐａｔｉｏｔｅｍｐｏｒａｌｃｈａｏｓｉｎｔｈｅｃｏｕｐｌｅｄｍａｐｌａｔｉｃｅｓｕｓｉｎｇｎｏｎｌｉｎｅａｒｆｅｄｂａｃｋｆｕｎｃｔｉｏｎｓＴｈｅｗｏｒｋｉｓｓｕｐｐｏｒｔｅｄｂｙｆｕｎｄｉｎｇｔｏＦａｎｇＪｉｎＱｉ...

关键词： Nonlinear feedback functions Synchronization Spatiotemporal chaos Coupled map lattices Noise effect

Cluster based node scheduling method for wireless sensor networks

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science China(Information sciences) 2012年第4期55卷 755-764页

作者： WANG Lei 1,2,WEI RuiZhong 2 & tIAN ZiHong 2,3 1 College of Software,Hunan university,Changsha 410082,China 2 department of computer science,Lakehead university,thunder Bay P7B 5E1,canada 3 mathematics and Information science College,Hebei Normal university,Shijiazhuang 050016,China 1. College of Software Hunan University Changsha 410082 China2. Department of Computer Science Lakehead University Thunder Bay P7B 5E1 Canada3. Mathematics and Information Science College Hebei Normal University Shijiazhuang 050016 China

By researching on the node scheduling problem of m-covered and connected sensor networks,a new concept of two-hops-cluster is proposed in this paper,and based on it,a new distributed node scheduling algorithm tHCNS for allocating all nodes in the sensor network into k(k≤m) different groups {0,1,...,k 1} is designed,without requiring location *** algorithm guarantees that each group to be connected and maintains the coverage ratio with high *** analysis and simulation results show that it has better performance than previous randomized scheduling scheme,and can prolong the lifetime of the sensor network effectively.

关键词： node scheduling lifetime wireless sensor network two-hops-cluster

REmARk ON CRItICAL SPEED OF tRAVELING WAVEFRONtS FOR NICHOLSON'S BLOWFLIES EQUAtION WItH DIFFUSION

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 Scientia 2010年第5期30卷 1561-1566页

作者：危地吴教育梅铭 department of Information and Computation Nanchang Hangkong University School of computer Engineering and technology Guangdong Institute of Science and Technology department of mathematics Champlain College Saint-LambertSaint-Lambert department of mathematics and Statistics McGill University

this note is devoted to the son＇s blowflies equation with diffusion, a critical speed of traveling waves, we give behavior with respect to the mature age study on the traveling wavefronts to the Nicholtime-delayed re... 详细信息

关键词： Nicholson's blowflies equation traveling wavefronts critical wave-speed

Accurate determination of the plate model based on CCD images with different orientations

在线全文

学校读者我要写书评

暂无评论

Chinese science Bulletin 2010年第9期55卷 791-796页

作者： PENG QingYu1,2,3,4 & FAN LiangYan1,2,3,4 1 Joint Lab.ratory for Astrometry, Dynamics and Space science, Jinan university, Guangzhou 510632, China 2 department of computer science, Jinan university, Guangzhou 510632, China 3 key Lab.ratory of Optoelectronic Information and Sensing technologies of Guangdong Higher Educational Institutes, Jinan university, Guangzhou 510632, China 4 Joint Lab.ratory for Optical Astronomy, Chinese Academy of sciences, kunming 650011, China Joint Lab.ratory for Astrometry Dynamics and Space Science Jinan University Guangzhou China department of computer science Jinan University Guangzhou China key Lab.ratory of Optoelectronic Information and Sensing technologies of Guangdong Higher Educational Institutes Jinan University Guangzhou China Joint Lab.ratory for Optical Astronomy Chinese Academy of Sciences Kunming China

the images of the open cluster NGC2168 are taken using the newly-fitted 2k×2k CCD attached to the 1-m telescope at the Yun-nan Observatory with two different orientations. After the catalogue position of a star from UCAC2 is compared with its corresponding measured position, a surprising result shows that a small field of view (ab.ut 7′×7′) exhibits an obvious distortion. Spe-cifically, the polynomial between the standard coordinate (ξ,η) and its corresponding measured one (x,y) for a star in each field of view has significant terms as high as 4th order. Accordingly, the positional measurement accuracy of a bright UCAC2 star can be derived as well as ~7 mas in each direction (60 s of exposure time and near the zenith). this new finding would be important for a CCD image to deliver a highly accurate position in its whole field of view.

关键词： CCD imaging field distortion positional measurement image analysis

multifractal modelling and spectrum analysis: methods and applications to gamma ray spectrometer data from southwestern Nova Scotia, canada

在线全文

学校读者我要写书评

暂无评论

science China Earth sciences 2006年第3期49卷 283-294页

作者： CHENG Qiuming1,2 1. State key Lab.of Geological Processes and mineral Resources, China university of Geosciences, Wuhan 430074, China 2. department of Earth and Space science and Engineering, department of Geography, York university, 4700 keele Street, toronto, Ontario, m3J 1P3, canada 1. State key Lab.of Geological Processes and mineral Resources China University of Geosciences Wuhan 430074 China 2. department of Earth and Space science and Engineering Department of Geography York University 4700 Keele Street Toronto Ontario M3J 1P3 Canada

multifractal spectrum, autocorrelation/semivariogram and power spectrum are three dif- ferent functions characterizing a field or measure from different aspects. these functions are interre- lated in such that the autocorrelation/semivariogram and power spectrum are related to the low order statistical moments (0 to 2 nd) which may determine the local multifractality (τ ″(1)) of a multifractal measure. A better understanding of the interrelationships among these three functions is important because, on one hand, the multifractal modelling characterizes a multifractal measure in a more de- tailed manner since it involves moments of all orders. On the other hand, the commonly used semivariogram and power spectrum functions can be used as alternatives to study the dominant mul- tifractal properties around the mean measure. moreover, semivariogram and power-spectrum func- tions provide spatial and spectral information, which is highly valued in geological applications. A new fractal relation found between area and power-spectrum will be useful for investigation of new meth- ods of spatial-spectral analysis for pattern recognition, anomaly separation, classification, etc. these results have been demonstrated with the case study of modelling gamma ray spectrometer data from the mineral district, southwestern Nova Scotia, canada. the results have shown that the values of uranium (U), thorium (th) and potassium (k) may possess monofractal properties whereas the ratios of these values show high multifractality. the values of the ratios U/k and U/th show relatively large variances and may provide more information for distinguishing the distinct phases of the granites, country rocks as well as possible gold mineralization-associated regional hydrothermal alteration zones. In addition, the power spectra for U, th, k, U/th and U/k consistently show two distinct power-law relationships for two ranges of wave number 12≤ω ≤160 km and 0≤ω ≤12 km. these properties might provide usefu

关键词： gamma ray spectrometer data, gold mineralization, alteration zones, multifractal modelling, spectral analysis, GIS.

Asymptotic SEP of mImO beamforming in two-hop AF relaying systems

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 377-383页

作者： FU YouHua1,HAN YuJie2,YANG LvXi2,ZHU WeiPing3 & LIU Chen1 1School of Electronic science and Engineering,Nanjing university of Posts and telecommunications,Nanjing 210003,China 2School of Information science and Engineering,Southeast university,Nanjing 210096,China 3department of Electrical and computer Engineering,Concordia university,montreal H3G 1m8,canada 1. School of Electronic science and Engineering Nanjing University of Posts and Telecommunications Nanjing 210003 China2. School of Information Science and Engineering Southeast University Nanjing 210096 China3. Department of Electrical and Computer Engineering Concordia University Montreal H3G 1M8 Canada

this paper derives an asymptotic average symbol error probab.lity(SEP)expression for multiple-input multiple-output(mImO)two-hop amplify-and-forward(AF)relay systems with optimal *** analysis at high signal-to-noise ratio(SNR)quantifies the diversity order and array gain,which are valid for any antenna numbers of the terminals and arbitrary channel fading *** is also proved that the system performance is dominated by the relatively degraded one of the two-hop *** results based on the simple expressions provide valuab.e insights into the performance and practical design considerations of mImO AF networks.

关键词： mImO relay networks optimal beamforming symbol error probab.lity(SEP) diversity order

△-tame quasi-hereditary algebras

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

science China mathematics 2007年第2期50卷 240-252页

作者： Yun-ge XU & Ying-bo ZHANG Faculty of mathematics and computer science, Hubei university, Wuhan 430062, China School of mathematics sciences, Beijing Normal university, Beijing 100875, China Faculty of mathematics and computer science Hubei University Wuhan China School of mathematics sciences Beijing Normal University Beijing China

Let (k, m,H) be an upper triangular bimodule problem. Briistle and Hille showed that the opposite algebra A of the endomorphism algebra of a projective generator P of the matrices category of (k., m, H) is quasi-hereditary, and there is an equivalence between the category of△-good modules of A and mat(k, m). In this note, based on the tame theorem for bimodule problems, we show that if the algebra A associated with an upper triangular bimodule problem is of△-tame representation type, then the category F(△) has the homogeneous property, i.e. almost all modules in F(△) are isomorphic to their Auslander-Reiten translations. moreover, if (k, m,H)is an upper triangular bipartite bimodule problem, then A is of△-tame representation type if and only if F(△) is homogeneous.

关键词： bimodule problem quasi-hereditary algebra △-tameness homogeneity.

Asymmetric encryption and signature method with DNA technology

在线全文

学校读者我要写书评

暂无评论

science China(Information sciences) 2010年第3期53卷 506-514页

作者： LAI XueJia1, LU mingXin2, QIN Lei3, HAN JunSong4 & FANG XiWen11department of computer science & Engineering, Shanghai Jiao tong university, Shanghai 200030, China 2School of National Information Security, Nanjing university, Nanjing 210093, China 3BIOCOmPLEX, 4915 Bathurst St. Unit# 209-366, ON m2R 1X9, canada 4National Engineering Center for BioChip at Shanghai, Shanghai 201203, China 1. department of computer science & Engineering Shanghai Jiao Tong University Shanghai 200030 China2. School of National Information Security Nanjing University Nanjing 210093 China3. BIOCOMPLEX 4915 Bathurst St. Unit# 209-366 Toronto ON M2R 1X9 Canada4. National Engineering Center for BioChip at Shanghai Shanghai 201203 China

this paper proposes DNA-PkC, an asymmetric encryption and signature cryptosystem by combining the technologies of genetic engineering and cryptology. It is an exploratory research of biological cryptology. Similar to conventional public-key cryptology, DNA-PkC uses two pairs of keys for encryption and signature, respectively. Using the public encryption key, everyone can send encrypted message to a specified user, only the owner of the private decryption key can decrypt the ciphertext and recover the message; in the signature scheme, the owner of the private signing key can generate a signature that can be verified by other users with the public verification key, but no else can forge the signature. DNA-PkC differs from the conventional cryptology in that the keys and the ciphertexts are all biological molecules. the security of DNA-PkC relies on diffcult biological problems instead of computational problems; thus DNA-PkC is immune from known attacks, especially the quantum computing based attacks.

关键词： cryptology asymmetric encryption digital signature biological cryptology DNA