共查询到20条相似文献,搜索用时 15 毫秒
1.
This paper presents a parallel two-level evolutionary algorithm based on domain decomposition for solving function optimization
problem containing multiple solutions. By combining the characteristics of the global search and local search in each sub-domain,
the former enables individual to draw closer to each optima and keeps the diversity of individuals, while the latter selects
local optimal solutions known as latent solutions in sub-domain. In the end, by selecting the global optimal solutions from
latent solutions in each sub-domain, we can discover all the optimal solutions easily and quickly.
Foundation item: Supported by the National Natural Science Foundation of China (60133010,60073043,70071042)
Biography: Wu Zhi-jian(1963-), male, Associate professor, research direction: parallel computing, evolutionary computation. 相似文献
2.
In this paper, algorithms of constructing wavelet filters based on genetic algorithm are studied with emphasis on how to construct
the optimal wavelet filters used to compress a given image,due to efficient coding of the chromosome and the fitness function,
and due to the global optimization algorithm, this method turns out to be perfect for the compression of the images.
Foundation item: Supported by the Natural Science Foundation of Education of Hunan Province(21010506)
Biography: Wen Gao-jin( 1978-), male, Master candidate, research direction: evolutionary computing. 相似文献
3.
In this paper, a new algorithm for solving multimodal function optimization problems-two-level subspace evolutionary algorithm
is proposed. In the first level, the improved GT algorithm is used to do global recombination search so that the whole population
can be separated into several niches according to the position of solutions; then, in the second level, the niche evolutionary
strategy is used for local search in the subspaces gotten in the first level till solutions of the problem are found. The
new algorithm has been tested on some hard problems and some good results are obtained.
Foundation item: Supported by the National Natural Science Foundation of China (70071042, 60073043, 60133010).
Biography: Li Yan( 1974-), female, Ph. D candidate, research interest: evolutionary computation. 相似文献
4.
Multi-objective optimization is a new focus of evolutionary computation research. This paper puts forward a new algorithm,
which can not only converge quickly, but also keep diversity among population efficiently, in order to find the Pareto-optimal
set. This new algorithm replaces the worst individual with a newly-created one by “multi-parent crossover”. so that the population
could converge near the true Pareto-optimal solutions in the end. At the same time, this new algorithm adopts niching and
fitness-sharing techniques to keep the population in a good distribution. Numerical experiments show that the algorithm is
rather effective in solving some Benchmarks. No matter whether the Pareto front of problems is convex or non-convex, continuous
or discontinuous, and the problems are with constraints or not, the program turns out to do well.
Foundation item: Supported by the National Natural Science Foundation of China(60133010, 60073043, 70071042)
Biography: Chen Wen-ping ( 1977-), female, Master candidate, research direction: evolutionary computation. 相似文献
5.
Based on the analysis of previous genetic algorithms (GAs) for TSP, a novel method called Ge- GA is proposed. It combines
gene pool and GA so as to direct the evolution of the whole population. The core of Ge- GA is the construction of gene pool
and how to apply it to GA. Different from standard GAs, Ge- GA aims to enhance the ability of exploration and exploitation
by incorporating global search with local search. On one hand a local search called Ge- Lo-calSearch operator is proposed
to improve the solution quality, on the other hand the modified Inver-Over operator called Ge- InverOver is considered as
a global search mechanism to expand solution space of local minimal. Both of these operators are based on the gene pool. Our
algorithm is applied to 11 well-known traveling salesman problems whose numbers of cities are from 70 to 1577 cities. The
experiments results indicate that Ge- GA has great robustness for TSP. For each test instance, the average value of solution
quality, found in accepted time, stays within 0. 001% from the optimum.
Foundation item: Supported by the National Natural Science Foundation of China (70071042, 60073043, and 60133010)
Biography: Yang Hui ( 1979-), female, Master candidate, research direction; evolutionary computation. 相似文献
6.
QI Chang WANG Gaofeng SHI Xinzhi 《武汉大学学报:自然科学英文版》2007,12(6):1051-1056
In this paper, we study the interconnect buffer and wiresizing optimization problem under a distributed RLC model to optimize not just area and delay, but also crosstalk for RLC circuit with non-monotone signal response. We present a new multiobjective genetic algorithm(MOGA) which uses a single objective sorting(SOS) method for constructing the non-dominated set to solve this multi-objective interconnect optimization problem. The MOGA/SOS optimal algorithm provides a smooth trade-off among signal delay, wave form, and routing area. Furthermore, we use a new method to calculate the lower bound of crosstalk. Extensive experimental results show that our algorithm is scalable with problem size. Furthermore, compared to the solution based on an Elmore delay model, our solution reduces the total routing area by up to 30%, the delay to the critical sinks by up to 25%, while further improving crosstalk up to 25.73% on average. 相似文献
7.
In this paper, we propose a new algorithm for wireless mobile and ad-hoc network, which establishes dynamic cluster of nodes.
The proposed algorithm, namely, the Mobility Sensitive Routing Protocol (MSRP), consists of routing in cluster and routing
between clusters. Ad-hoc network can utilize MSRP to reduce information exchange and communication bandwidth, to shorten route
acquisition delay, and to accommodate more nodes.
Foundation item: Supported by the National Natural Science Foundation of China (60133010,60073043,70071042).
Biography: Zhang Jian (1976-), male, Ph. D candidate. Lecturer, research direction: computer network, network optimization. 相似文献
8.
Chinese Postman Problem is an unsettled graphic problem. It was approached seldom by evolutionary computation. Now we use
genetic algorithm to solve Chinese Postman Problem in undirected graph and get good results. It could be extended to solve
Chinese postman problem in directed graph. We make these efforts for exploring in optimizing the mixed Chinese postman problem.
Foundation item: Supported by the National Natural Science Foundation of China (60133010, 70071042)
Biography: Jiang Hua(1974-), male, Master candidate, research direction: Evolutionary computation. 相似文献
9.
A fast algorithm is proposed to solve a kind of high complexity multi-objective problems in this paper. It takes advantages
of both the orthogonal design method to search evenly, and the statistical optimal method to speed up the computation. It
is very suitable for solving high complexity problems, and quickly yields solutions which converge to the Pareto-optimal set
with high precision and uniform distribution. Some complicated multi-objective problems are solved by the algorithm and the
results show that the algorithm is not only fast but also superior to other MOGAS and MOEAs, such as the currently efficient
algorithm SPEA, in terms of the precision, quantity and distribution of solutions.
Foundation item: Supported by the National Natural Science Foundation of China (60204001, 70071042, 60073043, 60133010) and Youth Chengguang
Project of Science and Technology of Wuhan City (20025001002).
Biography: Zeng San-you ( 1963-), male, Associate professor, research direction: evolutionary computing, parallel computing 相似文献
10.
对遗传程序设计思想进行拓展 ,通过对传统的进化策略进行改进 ,设计出一种新的快速全局寻优算法 ,该算法克服了传统的进化策略的缺点。实验表明这种新算法收敛速度快、有极强的避免局部极值的全局优化能力。 相似文献
11.
We introduced a new method—duration Hidden Markov Model (dHMM) to predicate the secondary structure of Protein. In our study,
we divide the basic second structure of protein into three parts: H (α-Helix), E (β-sheet) and O (others, include coil and
turn). HMM is a kind of probabilistic model which more thinking of the interaction between adjacent amino acids (these interaction
were represented by transmit probability), and we use genetic algorithm to determine the model parameters. After improving
on the model and fixed on the parameters of the model, we write a program HMMPS. Our example shows that HMM is a nice method
for protein secondary structure prediction.
Foundation item: Supported by the National Natural Science Foundation of China (30170214)
Biography: Huang Jing (1977-), female, Master candidate, research direction: bioinformatics. 相似文献
12.
A new dynamical evolutionary algorithm (DEA) based on the theory of statistical mechanics is presented. This algorithm is
very different from the traditional evolutionary algorithm and the two novel features are the unique of selecting strategy
and the determination of individuals that are selected to crossover and mutate. We use DEA to solve a lot of global optimization
problems that are nonlinear, multimodal and multidimensional and obtain satisfactory results.
Foundation item: Supported by the National Natural Science Foundation of China (No. 60133010, NO. 60073043 and No. 700/1042)
Biography: Zou Xiu-fen(1996-), female, Ph. D candidate, Associate professor, research direction: evolutionary computing, parallel
computing. 相似文献
13.
WANGHua-qun ZHAOJun-xi ZHANGLi-jun 《武汉大学学报:自然科学英文版》2005,10(1):165-168
Based on the difficulty of solving the ECDLP (elliptic curve discrete logarithm problem) on the finite field, we present a (t, n) threshold signature scheme and a verifiable key agreement scheme without trusted party. Applying a modified elliptic curve signature equation, we get a more efficient signature scheme than the existing ECDSA (ellipticcurve digital signature algorithm) from the computability and security view. Our scheme has a shorter key, faster computation, and better security. 相似文献
14.
A new evolutionary algorithm for function optimization 总被引:27,自引:1,他引:26
A new algorithm based on genetic algorithm(GA) is developed for solving function optimization problems with inequality constraints.
This algorithm has been used to a series of standard test problems and exhibited good performance. The computation results
show that its generality, precision, robustness, simplicity and performance are all satisfactory.
Foundation item: Supported by the National Natural Science Foundation of China (No. 69635030), National 863 High Technology
Project of China, the Key Scientific Technology Development Project of Hubei Province.
Biography: GUO Tao(1971-), male, Ph D, research interests are in evolutionary computation and network computing. 相似文献
15.
Network flow control is formulated as a global optimization problem of user profit. A general global optimization flow control
model is established. This model combined with the stochastic model of TCP is used to study the global rate allocation characteristic
of TCP. Analysis shows when active queue management is used in network TCP rates tend to be allocated to maximize the aggregate
of a user utility functionU
s (called,U
s fairness). The TCP throughput formula is derived An improved TCP congestion control mechanism is proposed. Simulations show
its throughput is TCP friendly when competing with existing TCP and its rate change is smoother. Therefore, it is suitable
to carry multimedia applications.
Foundation item: Supported by the 95 National Defense Project (31.1.2.3)
Biography: Pan Li (1974-), male, Ph. D. candidate, research direction: broadband networks, congestion control and IP quality
of service. 相似文献
16.
The number of frequent subtrees usually grows exponentially with the tree size because of combinatorial explosion. As a result,
there are too many frequent subtrees for users to manage and use. To solve this problem, we generalize a compressed frame
based on δ-cluster to the problem of compressing frequent-subtree sets, and propose an algorithm RPTlocal which can mine compressed
frequent subtrees set directly. This algorithm sacrifices the theoretical bounds but still has good compression quality. By
pruning the search space and generating frequent subtrees directly, this algorithm is also efficient. Experiment result shows
the representative subtrees mining by RPTlocal is almost two orders of magnitude less than the whole collection of the closed
subtrees, and is more efficient than CMtreeMiner, the algorithm for mining both closed and Maximal frequent subtrees.
Foundation item: Supported by the National Natural Science Foundation of China (70371015) 相似文献
17.
YIN Xinchun YANG Jie XIE Li . Department of Computer Science Engineering Yangzhou University Yangzhou Jiangsu China . State Key Laboratory for Novel Software Technology Nanjing University Nanjing Jiangsu China 《武汉大学学报:自然科学英文版》2007,12(1):131-134
0 Introduction Being as unique nonlinear components of block ci- pher algorithms, S-boxes provide the most important confusion effect, and directly influence the security of the algorithms. There are many ways to construct S-boxes[1-5]. On one hand, diffe… 相似文献
18.
A watermarking algorithm of binary images using adaptable matrix is presented. An adaptable matrix is designed to evaluate the smoothness and the connectivity of binary images. The watermark is embedded according to the adaptable matrix in this algorithm. In the proposed watermarking algorithm, each image block implements a XOR operation with the binary adaptable matrix, which has the same size with the image block, and in order to embed the watermark data, a multiplication operation are also implemented with the weight matrix. The experimental results show that proposed scheme has a good performance. 相似文献
19.
YAN Zizong FEI Pusheng WANG Xiaoli 《武汉大学学报:自然科学英文版》2006,11(3):493-497
This paper discusses a re-examinatlon of dual methods based on Gomory's cutting plane for the solution of the integer programming problem, in which the increment of objection function is allowed as a pivot variable to decide the search direction and stepsize. Meanwhile, we adopt the current equivalent face technique so that lattices are found in the discrete integral face and stronger valid inequalities are acquired easily. 相似文献
20.
When acquaintances of a model are little or the model is too complicate to build by using traditional time series methods,
it is convenient for us to take advantage of genetic programming (GP) to build the model. Considering the complexity of nonlinear
dynamic systems, this paper proposes modeling dynamic systems by using the nonlinear difference equation based on GP technique.
First it gives the method, criteria and evaluation of modeling. Then it describes the modeling algorithm using GP. Finally
two typical examples of time series are used to perform the numerical experiments. The result shows that this algorithm can
successfully establish the difference equation model of dynamic systems and its predictive result is also satisfactory.
Foundation item: Supported by Foundation for University Key Teacher by the Ministry of Education of China
Biography: Liu Min ( 1978-), female, Master candidate, research derection: application mathematics. 相似文献