检索结果-南通市图书馆

Combined forecast method of HMM and LS-SVM about electronic equipment state based on MAGA

在线全文

学校读者我要写书评

暂无评论

Journal of Systems Engineering and Electronics 2016年第3期27卷 730-738页

作者： jianzhong zhao Jianqiu Deng Wen Ye Xiaofeng Lü Department of Ordnance Science and Technology Naval Aeronautical and Astronautical University

For the deficiency that the traditional single forecast methods could not forecast electronic equipment states, a combined forecast method based on the hidden Markov model（HMM） and least square support vector machine（LS-SVM） is presented. The multi-agent genetic algorithm（MAGA） is used to estimate parameters of HMM to overcome the problem that the Baum-Welch algorithm is easy to fall into local optimal solution. The state condition probability is introduced into the HMM modeling process to reduce the effect of uncertain factors. MAGA is used to estimate parameters of LS-SVM. Moreover, pruning algorithms are used to estimate parameters to get the sparse approximation of LS-SVM so as to increase the ranging performance. On the basis of these, the combined forecast model of electronic equipment states is established. The example results show the superiority of the combined forecast model in terms of forecast precision,calculation speed and stability.

关键词： parameter estimation hidden Markov model(HMM) least square support vector machine(LS-SVM) multi-agent genetic algorithm(MAGA) state forecast

Effect of casting speed on surface quality of horizontal direct chill casting 7075 aluminum alloy ingot

在线全文

学校读者我要写书评

暂无评论

Acta Metallurgica Sinica(English Letters) 2011年第5期24卷 399-404页

作者： Qingfeng ZHU Zhihao zhao jianzhong CUI Xiangjie WANG Ke QIN Key Laboratory of Electromagnetic Processing of Materials Ministry of Education Northeastern University Shenyang 110819 China

7075 aluminum alloy ingot with the diameter izontal direct chill casting in different casting of 100 mm has been produced by horspeed. The effect of the casting speed on the ingot surface and subsurface layer was studied by surface observation and subsurface structure analysis. It was found that increasing the casting speed results in the adding of segregation knots in the ingot surface. The thickness of the dendrite microstrueture layer in the subsurface reduces with increasing the casting speed. And the elements of Zn, Cu and Mg enrich in the coarse dendrite microstructure layer of the ingot.

关键词： Horizontal direct chill casting Casting speed 7075 aluminumalloy Surface quality

A nonlocal strain gradient shell model incorporating surface effects for vibration analysis of functionally graded cylindrical nanoshells

在线全文

学校读者我要写书评

暂无评论

Applied Mathematics and Mechanics(English Edition) 2019年第12期40卷 1695-1722页

作者： Lu LU Li ZHU Xingming GUO jianzhong zhao Guanzhong LIU Shanghai Institute of Applied Mathematics and Mechanics Shanghai Key Laboratory of Mechanics in Energy Engineering School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200072 China Department of Mechanical Engineering University of Alberta School of Mathematics and Computational Sciences Xiangtan UniversityXiangtan 411105 Hunan Province China

In this pap er, a novel size-dep endent functionally graded (FG) cylindrical shell model is develop ed based on the nonlocal strain gradient theory in conjunction with the Gurtin-Murdoch surface elasticity theory . The new model containing a nonlocal parameter, a material length scale parameter, and several surface elastic constants can capture three typical typ es of size e ects simultaneously , which are the nonlocal stress ef- fect, the strain gradient e ect, and the surface energy e ects. With the help of Hamilton’s principle and rst-order shear deformation theory , the non-classical governing equations and related b oundary conditions are derived. By using the prop osed model, the free vibra- tion problem of FG cylindrical nanoshells with material prop erties varying continuously through the thickness according to a p ower-law distribution is analytically solved, and the closed-form solutions for natural frequencies under various b oundary conditions are obtained. After verifying the reliability of the prop osed model and analytical method by comparing the degenerated results with those available in the literature, the in uences of nonlocal parameter, material length scale parameter, p ower-law index, radius-to-thickness ratio, length-to-radius ratio, and surface e ects on the vibration characteristic of func- tionally graded cylindrical nanoshells are examined in detail.

关键词： nonlocal strain gradient theory surface elasticity theory rst-order shear deformation theory vibration functionally graded (FG) cylindrical nanoshell

SIMULTANEOUS MULTIPLE TARGET RECOGNITION USING POLARIZATION AGILE WAVES

在线全文

学校读者我要写书评

暂无评论

Journal of Electronics(China) 2012年第3期29卷 237-241页

作者： Chen Xinwei zhao jianzhong Wu Wen Ministerial Key Laboratory of JGMT Nanjing University of Science and TechnologyNanjing 210004China

A novel matching method for simultaneous multi-target recognition is proposed by jointly considering target's prior scattering knowledge and the polarization parameters of radar echoes. The matching coefficients are calculated for the judgment. MATLAB simulations show that several targets can be accurately recognized simultaneously, and a high recognition probability can be achieved in Monte Carlo simulations. The total execution time can be remarkably reduced in the Field Programmable Gate Array (FPGA) implementation of the matching procedure.

关键词： Matching method Multiple target recognition Polarization agile waves Field Programmable Gate Arrays (FPGA)

A Theory of Bio-Quantum Genetics

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Quantum Information Science 2024年第1期14卷 15-27页

作者： jianzhong zhao Geophysics Department Yunnan University Kunming China

The physical mechanism of heredity or inheritance of genes is a quantum mechanical and/or quantum computational process. A theory of bio-quantum genetics is established in this paper. Principle of Bio-quantum Genetics is suggested. I propose and define the soft-genes of genetics controlling the processes of heredity or inheritance of genes. This research deals with the quantum mechanisms of Mendel plant heredity and family inheritance as examples of bio-quantum genetics, deepening our understanding of heredity or inheritance. I believe that more contributions will be made to promote researches of bio-quantum genetics or quantum biology at large.

关键词： Bio-Quantum Genetics Quantum Mechanics Genes Soft Genes Quantum Mechanism of Mendel Plant Heredity Quantum Mechanism of Family Inheritance

On Security of Quantum Cryptography by Probabilistic Analysis

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Quantum Information Science 2022年第4期12卷 91-98页

作者： jianzhong zhao Geophysics Department Yunnan University Kunming China

The existing quantum cryptography is a classical cryptography in nature and basically insecure because of its classical (conventional) bits, classical encryption algorithm and classical (public) channel. A novel topic about successful communication between the legitimate users, Alice and Bob, is discussed with probability of solution uniqueness of Bob’s decryption equation. We find, by probabilistic analysis, that success of communication between Alice and Bob is probabilistic with a probability bigger than 1/2. It is also novel to define insecurity of the quantum cryptography by probability of solution uniqueness of the search equation of Eve, the eavesdropper. The probability of Eve’s success to find the plain-text of Alice (and Bob) is greater than 1/2, and so the quantum cryptography is seriously insecure.

关键词： Quantum Cryptography Classical Cryptography Fundamental Equations Unique Solution Probability Insecure

Lorentz Transformation Derived from Relativity of Time

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Modern Physics 2022年第6期13卷 851-857页

作者： jianzhong zhao Geophysics Department Yunnan University Kunming China

The principles of special relativity and Einstein’s simple derivation of the Lorentz transformation are reviewed. A new simple derivation of the Lorentz transformation is developed in this paper, by a new approach of light-pulse observation or time-dilation observation. Therefore, under the two principles of special relativity, there exist two equivalent simple derivations of or two equivalent approaches to the Lorentz transformation. Einstein’s approach emphasizes or highlights relativity of space while our approach emphasizes or highlights relativity of time. This research reveals, in a particular way, the equivalence of relativity of space and relativity of time in special relativity. Combination of Einstein’s approach and the approach developed in this paper makes the methodology of simple derivation of the Lorentz transformation complete and perfect.

关键词： Special Relativity Lorentz Transformation Relativity of Space Relativity of Time

A Quantum Mechanical Proof of Insecurity of the Theoretical QKD Protocols

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

Journal of Quantum Information Science 2022年第3期12卷 53-63页

作者： jianzhong zhao Geophysics Department Yunnan University Kunming China

Cryptography is crucial to communication security. In 1984, a well-known QKD (quantum key distribution) protocol, BB84, was published by Bennett and Brassard. The BB84 Protocol was followed by the QKD protocols published by Ekert (1991) (E91) and Bennett (1992) (B92). Some authors proved security of the theoretical QKD protocols in different theoretical frameworks by defining security of QKD protocols differently. My argument is that the previous proofs of security are neither unique nor exhaustive for each theoretical QKD protocol, which means that proof of security of the theoretical QKD protocols has not been completed or achieved. The non-uniqueness and the non-exhaustiveness of the proofs will lead to more proofs. However, a coming “proof” of security of the theoretical QKD protocols is possible to be a disproof. The research by quantum mechanics in this paper disproves security of the theoretical QKD protocols, by establishing the theoretical framework of quantum mechanical proof, defining security of QKD protocols, establishing the quantum state of the final key of the theoretical protocols from their information leakages, and applying Grover’s fast quantum mechanical algorithm for database search to the quantum state of the final key to result in the Insecurity Theorem. This result is opposite to those of the previous proofs where the theoretical QKD protocols were secure. It is impossible for Alice and Bob to protect their communications from information leakage by stopping or canceling the protocols. The theoretical QKD keys are conventional and basically insecure. Disproof of security of the theoretical QKD protocols is logical.

关键词： Quantum Mechanics Quantum Cryptography Quantum Computation Security Proof

Children of Made Island

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

China Oil & Gas 2023年第4期30卷 56-57页

作者： zhao jianzhong

Not a big place,Made Island covers 12 square kilometers and has four primeval natural *** island didn’t attract much attention from the world until an oil and gas pipeline brought it global *** of silence were interrupted by the deployment of the crude oil terminal of the Sino-Myanmar Pipeline and its storage tanks weighing 1.2 million *** the children of Made Island,

关键词：