Journal of Zhejiang University SCIENCE C
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Learning robust principal components from L1-normmaximization
Journal of Zhejiang University SCIENCE C - Tập 13 - Trang 901-908 - 2012
Principal component analysis (PCA) is fundamental in many pattern recognition applications. Much research has been performed to minimize the reconstruction error in L1-norm based reconstruction error minimization (L1-PCA-REM) since conventional L2-norm based PCA (L2-PCA) is sensitive to outliers. Recently, the variance maximization formulation of PCA with L1-norm (L1-PCA-VM) has been proposed, whe...... hiện toàn bộ
A parallel and scalable digital architecture for training support vector machines
Journal of Zhejiang University SCIENCE C - Tập 11 - Trang 620-628 - 2010
To facilitate the application of support vector machines (SVMs) in embedded systems, we propose and test a parallel and scalable digital architecture based on the sequential minimal optimization (SMO) algorithm for training SVMs. By taking advantage of the mature and popular SMO algorithm, the numerical instability issues that may exist in traditional numerical algorithms are avoided. The error ca...... hiện toàn bộ
Application of formal languages in polynomial transformations of instances between NP-complete problems
Journal of Zhejiang University SCIENCE C - Tập 14 - Trang 623-633 - 2013
We propose the usage of formal languages for expressing instances of NP-complete problems for their application in polynomial transformations. The proposed approach, which consists of using formal language theory for polynomial transformations, is more robust, more practical, and faster to apply to real problems than the theory of polynomial transformations. In this paper we propose a methodology ...... hiện toàn bộ
Global stability analysis of computer networks with arbitrary topology and time-varying delays
Journal of Zhejiang University SCIENCE C - Tập 11 - Trang 214-226 - 2010
In this paper, we determine the delay-dependent conditions of global asymptotic stability for a class of multi-dimensional nonlinear time-delay systems with application to computer communication networks. A nonlinear delayed model is considered for a rate-based congestion control system of a heterogeneous network with arbitrary topology and time-varying delays. We propose a Lyapunov-based method t...... hiện toàn bộ
Task mapper and application-aware virtual machine scheduler oriented for parallel computing
Journal of Zhejiang University SCIENCE C - Tập 13 - Trang 155-177 - 2012
We design a task mapper TPCM for assigning tasks to virtual machines, and an application-aware virtual machine scheduler TPCS oriented for parallel computing to achieve a high performance in virtual computing systems. To solve the problem of mapping tasks to virtual machines, a virtual machine mapping algorithm (VMMA) in TPCM is presented to achieve load balance in a cluster. Based on such mapping...... hiện toàn bộ
Topic-aware pivot language approach for statisticalmachine translation
Journal of Zhejiang University SCIENCE C - Tập 15 - Trang 241-253 - 2014
The pivot language approach for statistical machine translation (SMT) is a good method to break the resource bottleneck for certain language pairs. However, in the implementation of conventional approaches, pivot-side context information is far from fully utilized, resulting in erroneous estimations of translation probabilities. In this study, we propose two topic-aware pivot language approaches t...... hiện toàn bộ
Modified extremal optimization for the hard maximum satisfiability problem
Journal of Zhejiang University SCIENCE C - Tập 12 - Trang 589-596 - 2011
Based on our recent study on probability distributions for evolution in extremal optimization (EO), we propose a modified framework called EOSAT to approximate ground states of the hard maximum satisfiability (MAXSAT) problem, a generalized version of the satisfiability (SAT) problem. The basic idea behind EOSAT is to generalize the evolutionary probability distribution in the Bose-Einstein-EO (BE...... hiện toàn bộ
Detection of quantization index modulation steganography in G.723.1 bit stream based on quantization index sequence analysis
Journal of Zhejiang University SCIENCE C - Tập 13 - Trang 624-634 - 2012
This paper presents a method to detect the quantization index modulation (QIM) steganography in G.723.1 bit stream. We show that the distribution of each quantization index (codeword) in the quantization index sequence has unbalanced and correlated characteristics. We present the designs of statistical models to extract the quantitative feature vectors of these characteristics. Combining the extra...... hiện toàn bộ
Supply chain network design under uncertainty with new insights from contracts
Journal of Zhejiang University SCIENCE C - Tập 15 Số 12 - Trang 1106-1122 - 2014
Solving infinite horizon nonlinear optimal control problems using an extended modal series method
Journal of Zhejiang University SCIENCE C - Tập 12 - Trang 667-677 - 2011
This paper presents a new approach for solving a class of infinite horizon nonlinear optimal control problems (OCPs). In this approach, a nonlinear two-point boundary value problem (TPBVP), derived from Pontryagin’s maximum principle, is transformed into a sequence of linear time-invariant TPBVPs. Solving the latter problems in a recursive manner provides the optimal control law and the optimal tr...... hiện toàn bộ
Tổng số: 339
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