Interdisciplinary Information Sciences
Online ISSN : 1347-6157
Print ISSN : 1340-9050
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Volume 11 , Issue 2
Showing 1-10 articles out of 10 articles from the selected issue
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  • Nozomu MOCHIZUKI
    Volume 11 (2005) Issue 2 Pages 117-125
    Released: September 16, 2005
    JOURNALS FREE ACCESS
    The connection between log.subharmonicity and the integral mean inequality discussed in Armitage and Goldstein [1], Ekonen [2] and Mochizuki [3] will be treated for the exponent p, 1<p<(n+2)⁄n.
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  • Fan CHEN, Takafumi AOKI, Tsuyoshi HORIGUCHI
    Volume 11 (2005) Issue 2 Pages 127-139
    Released: September 16, 2005
    JOURNALS FREE ACCESS
    We propose an approach for unsupervised image segmentation based on the Markov random field by using the Bethe approximation. We first derive the Bayesian information criterion under the Bethe approximation and then propose an iterative algorithm to search a model which fits the image data best. For this aim, we derive a criterion for merging two components among several components in terms of a perturbation expansion. Namely, annihilation of components is implemented by merging two components into one component after each convergence of the supervised segmentation with a fixed number of components. We find by numerical experiments that the optimal number of components is selected from the series of local optima with different numbers of components and the best result for segmentation is obtained with good performance.
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  • Takahiro MORI, Shukichi MIYAZAKI, Go MIYATA, Ko SUGAWARA, Ko ONODERA, ...
    Volume 11 (2005) Issue 2 Pages 141-147
    Released: September 16, 2005
    JOURNALS FREE ACCESS
    Objective: The aim of this study was to reveal the factors that influence the prognosis of esophageal cancer patients, especially from the other causes than esophageal cancer in the follow-up period after esophagectomy.
    Method: All of 523 patients with esophageal carcinoma who underwent esophagectomy in a single institute between 1986 and 1999 were followed-up until the end of October 2003. Their prognoses were reviewed and compared by the presence of pre/post-operative radiation, pre/post-operative chemotherapy, surgical procedure, and pathological stages of tumors as well as preoperative general conditions by uni- and multivariate analyses.
    Results: Univariate analysis revealed that sex (male against female) (p=0.005), abnormality on ECG (p=0.012), and the presence of preoperative radiation (p=0.016) significantly increased the incidence of non-esophageal cancer death; on the other hand, thoracoscopic approach decreased the incidence of non-esophageal cancer death. Multivariate analyses revealed that the presence of preoperative radiation significantly increased mortality due to non-esophageal cancer causes to a 3.70 hazard ratio (95% CI [95% Confidence Interval]; 1.33–10.61).
    Conclusions: This study clearly showed the late effect of preoperative radiation for carcinoma of the esophagus on the postoperative prognosis, especially in terms of later mortality from causes other than esophageal carcinoma.
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Special Issue on Mathematical Aspects of Image Processing and Computer Vision
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