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Volume E94.A, Issue 1
Displaying 51-57 of 57 articles from this issue
Regular Section
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Weisong HE, Guangmin HU, Yingjie ZHOU, Haiyan JINArticle type: LETTER
Subject area: Graphs and Networks
2011 Volume E94.A Issue 1 Pages 440-442
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSIn this letter, a new definition of two-stage spatiotemporal approach, called ICA-WFS (Independent-Component-Analysis-Weighted-Frequent-Substructure) is proposed. To facilitate capturing abnormal behavior across multiple networks and dimensionality reduction at a single Point of Presence (PoP), ICA is applied. With application of WFS, an complete graph is examined, unusual substructures of which are reported. Experiments are conducted and, together with application of backbone network (Internet2) Netflow data, show some positive results.View full abstractDownload PDF (200K) -
Zheng YANG, Pinhui KEArticle type: LETTER
Subject area: Cryptography and Information Security
2011 Volume E94.A Issue 1 Pages 443-447
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSIn this letter, we generalize the binary sequence introduced by Li et al. in [S. Q. Li et al., On the randomness generalized cyclotomic sequences of order two and length pq, IEICE Trans. Fund, vol. E90-A, no.9, pp.2037-2041, 2007] to sequence over arbitrary prime fields. Furthermore, the auto-correlation distribution and linear complexity of the proposed sequence are presented.View full abstractDownload PDF (94K) -
Improved Global Motion Estimation Based on Iterative Least-Squares with Adaptive Variable Block SizeLeiqi ZHU, Dongkai YANG, Qishan ZHANGArticle type: LETTER
Subject area: Image
2011 Volume E94.A Issue 1 Pages 448-451
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSIn order to reduce the convergence time in an iterative procedure, some gradient based preliminary processes are employed to eliminate outliers. The adaptive variable block size is also introduced to balance the accuracy and computational complexity. Moreover, the use of Canberra distance instead of Euclidean distance illustrates higher performance in measuring motion similarity.View full abstractDownload PDF (1400K) -
Tuan-Anh NGUYEN, Won-Seon SONG, Min-Cheol HONGArticle type: LETTER
Subject area: Image
2011 Volume E94.A Issue 1 Pages 452-456
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSIn this letter, we propose a spatially adaptive noise removal algorithm using local statistics. The proposed algorithm consists of two stages: noise detection and removal. In order to solve the trade-off between the effective noise suppression and the over-smoothness of the reconstructed image, local statistics such as local maximum and the local weighted activity is defined. With the local statistics, the noise detection function is defined and a modified Gaussian filter is used to suppress the detected noise components. The experimental results demonstrate the effectiveness of the proposed algorithm.View full abstractDownload PDF (618K) -
Yu QIU, Zenggang DU, Kiichi URAHAMAArticle type: LETTER
Subject area: Image
2011 Volume E94.A Issue 1 Pages 457-460
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSWe propose, in this letter, a new type of image denoising filter using a data analysis technique. We deal with pixels as data and extract the most dominant cluster from pixels in the filtering window. We output the centroid of the extracted cluster. We demonstrate that this graph-spectral filter can effectively reduce a mixture of Gaussian and random impulsive noise.View full abstractDownload PDF (1209K) -
Chi-Shan YUArticle type: LETTER
Subject area: Measurement Technology
2011 Volume E94.A Issue 1 Pages 461-463
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSThis letter proposes a dynamic phasor-based apparent impedance measuring method for a single-line-to-ground fault. Using the proposed method, the effects of the decaying DC components on the apparent impedance of a single-line-to-ground fault can be completely removed. Compared with previous works, the proposed method uses less computation to measure an accurate apparent impedance.View full abstractDownload PDF (289K) -
Tatsuya KAIArticle type: LETTER
Subject area: General Fundamentals and Boundaries
2011 Volume E94.A Issue 1 Pages 464-467
Published: January 01, 2011
Released on J-STAGE: January 01, 2011
JOURNAL RESTRICTED ACCESSThis letter presents integrating algorithms for affine constraints defined on a manifold. We first explain definition and geometric representation of affine constraints. Next, we derive integrating algorithms to calculate independent first integrals of affine constraints for the two cases where the they are completely integrable and partially nonintegrable. Moreover, we prove the existence of inverse functions in the algorithms. Some examples are also shown to verify our results.View full abstractDownload PDF (95K)