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FIXED-POINt CONtINUAtION APPLIED tO COMPRESSED SENSING:IMPLEMENtAtION AND NUMERICAL EXPERIMENtS

Journal of Computational Mathematics 2010年第2期28卷 170-194页

作者： elaine t.hale Department of Computational and Applied Mathematics Rice University

Fixed-point continuation （FPC） is an approach, based on operator-splitting and continuation, for solving minimization problems with l1-regularization：min ｜｜x｜｜1＋uf（x）.We investigate the application of this algorithm to compressed sensing signal recovery, in which f（x） = 1/2｜｜Ax-b｜｜2M,A∈m×n and m≤n. In particular, we extend the original algorithm to obtain better practical results, derive appropriate choices for M and u under a given measurement model, and present numerical results for a variety of compressed sensing problems. the numerical results show that the performance of our algorithm compares favorably with that of several recently proposed algorithms.

关键词： l1 regularization Fixed-point algorithm Continuation Compressed sensing,Numerical experiments.

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temporal Patterns of Software Evolution Defects: A Comparative Analysis of Open Source and Closed Source Projects

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Journal of Software Engineering and Applications 2011年第8期4卷 497-511页

作者： Uzma Raja Joanne elaine hale David Peter hale 不详

this study examines temporal patterns of software systems defects using the Autoregressive Integrated Moving Average (ARIMA) approach. Defect reports from ten software application projects are analyzed;five of these projects are open source and five are closed source from two software vendors. Across all sampled projects, the ARIMA time series modeling technique provides accurate estimates of reported defects during software maintenance, with organizationally dependent parameterization. In contrast to causal models that require extraction of source-code level metrics, this approach is based on readily available defect report data and is less computation intensive. this approach can be used to improve software maintenance and evolution resource allocation decisions and to identify outlier projects—that is, to provide evidence of unexpected defect reporting patterns that may indicate troubled projects.

关键词： Open Source Software Software Defects Software Maintenance time Series Analysis

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temporal Patterns of Software Evolution Defects: A Comparative Analysis of Open Source and Closed Source Projects

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Journal of Software Engineering and Applications（软件工程与应用） 2011年第8期

作者： Uzma Raja Joanne elaine hale David Peter hale

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