Optimal parameter estimation of ε-filter employing distribution distance     

Noriaki Suetake  Go Tanaka  Hayato Hashii  Eiji Uchino 《Journal of The Franklin Institute》2012,349(8):2570-2584

As the filter which can effectively remove the small amplitude noises on digital images, the $\epsilon \mathrm{-}\mathrm{filter}$ has been proposed. In order to effectively use this filter, a smoothing parameter $\epsilon \mathrm{-}\mathrm{filter}$ should be appropriately estimated before applying it. To address this problem, the authors proposed the parameter estimation method based on Hellinger distance (HD). In the method, HD between a residual signal and assumed noise distribution was evaluated, and a parameter $\epsilon$ of the $\epsilon \mathrm{-}\mathrm{filter}$ was estimated by finding the value giving minimum distance. However, the enough discussion on use of HD has not been made.In this paper, it is attempted to utilize not only the HD, but also various distribution distances in the parameter estimation, and their performances and characteristics are compared and analyzed experimentally. Furthermore, the parameter estimation method is extended to be applicable for the vector $\epsilon \mathrm{-}\mathrm{filter}$ for the color images. Consequently, through the experiments, it is shown that L1-norm or maximum norm is appropriate as the distribution distance used in the parameter estimation methods from the view points of the simplicity of the calculation and MSE performance in the filtering.  相似文献   

Time-weighted web authoritative ranking     

Bundit Manaskasemsak  Arnon Rungsawang  Hayato Yamana 《Information Retrieval》2011,14(2):133-157

We investigate temporal factors in assessing the authoritativeness of web pages. We present three different metrics related to time: age, event, and trend. These metrics measure recentness, special event occurrence, and trend in revisions, respectively. An experimental dataset is created by crawling selected web pages for a period of several months. This data is used to compare page rankings by human users with rankings computed by the standard PageRank algorithm (which does not include temporal factors) and three algorithms that incorporate temporal factors, including the Time-Weighted PageRank (TWPR) algorithm introduced here. Analysis of the rankings shows that all three temporal-aware algorithms produce rankings more like those of human users than does the PageRank algorithm. Of these, the TWPR algorithm produces rankings most similar to human users’, indicating that all three temporal factors are relevant in page ranking. In addition, analysis of parameter values used to weight the three temporal factors reveals that age factor has the most impact on page rankings, while trend and event factors have the second and the least impact. Proper weighting of the three factors in TWPR algorithm provides the best ranking results.  相似文献   

Foreign Communication     

Hayato Yamanaka  Uma Narula  W. Barnett Pearce  Barry Lesser  Louis Vagianos 《Communication Booknotes Quarterly》2013,44(4-5):42-44

Australia, Henry Mayer reports on ten recent publications

COMMUNICATIONS LAW AND POLICY IN THE PEOPLE'S REPUBLIC OF CHINA: EXPERIENCES & REFLECTIONS (International Law Institute, 1330 Connecticut Ave. NW, Washington, DC 20036 price not given, paper)

JAPANESE COMMUNICATION STUDIES OF THE 1970S: BIBLIOGRAPHIC ABSTRACTS OF STUDIES PUBLISHED ONLY IN JAPANESE compiled by Hayato Yamanaka, et al. (Honolulu: University of Hawaii Press, 1986—price not given, paper)

DEVELOPMENT AS COMMUNICATION: A PERSPECTIVE ON INDIA by Uma Narula and W. Barnett Pearce (Carbondale: Southern Illinois University Press, 1986—$19.95)

COMPUTER COMMUNICATIONS AND THE MASS MARKET IN CANADA by Barry Lesser and Louis Vagianos (Brookfield, VT: Brookfield Publishing, 1985—$10.00, paper)

SEX-ROLE STEREOTYPING IN THE BROADCAST MEDIA: A REPORT ON INDUSTRY SELF-REGULATION (Ottawa: Canadian Radio-Television and Telecommunications Commission, 1986—pricenot given, paper)  相似文献   

Simple lightness modification for color vision impaired based on Craik–O'Brien effect     

Noriaki Suetake  Go Tanaka  Hayato Hashii  Eiji Uchino 《Journal of The Franklin Institute》2012,349(6):2093-2107

In comparison with the people having the normal color vision, the people with color vision impairment such as dichromats have the difficulty to distinguish the colors in certain combinations. This may pose an impediment of the visual communication in the recent wide spreading of the use of colors. In order to address this problem, in this paper, we propose a novel lightness modification method to improve the visibility of the color image for the color vision impaired. In the proposed method, the lightness modification is only carried out around contours of objects to realize the Craik–O'Brien effect, which is an perceptual illusion of the contrast, for dichromats. Furthermore, in the proposed method, it is tried to preserve the impression given by original color image by lessening the change of the color as possible while providing the perceptible and comprehensible color image for dichromats. Through some examples, the effectiveness and the validity of the proposed method are verified.  相似文献   

The Usefulness of Saturated Salt Solution Embalming Method for Oral Surgical Skills Training: A New Cadaveric Training Model for Bone Harvesting     

Masato Watanabe  Yuya Yoneyama  Hayato Hamada  Michihide Kohno  On Hasegawa  Hidetoshi Takahashi  Yoko Kawase-Koga  Akira Matsuo  Daichi Chikazu  Shinichi Kawata  Masahiro Itoh 《Anatomical sciences education》2020,13(5):628-635

The purpose of this study was to assess the usefulness of saturated salt solution-embalmed cadavers for oral surgical skills training related to bone graft harvesting. Two half-day surgical skills training workshops were held at the Tokyo Medical University utilizing eight cadavers embalmed with the saturated salt solution. A total of 22 participants including oral surgeons, residents, and dentists attended the workshop. Surgical training consisted of six procedures related to intraoral and extraoral bone harvesting. The participants were surveyed to assess self-confidence levels for each surgical procedure before and after completion of each workshop. The Wilcoxon signed-rank test was used to compare the differences between each median score before and after the workshop. There were statistically significant increases in the self-assessed confidence scores in bone harvesting procedures for the zygomatic bone (P = 0.003), maxillary tuberosity (P = 0.002), and other sites (P < 0.001). The anatomical features of saturated salt solution-embalmed cadavers were also examined. The textures of the oral mucosa and skin were similar to those of living individuals. The structure of bone tissues was well-preserved and the hardness was realistic. Consequently, all procedures were performed with sufficient realism. The saturated salt solution method has a relatively low cost of preparation and storage, and almost no odor. The authors suggest that saturated salt solution-embalmed cadavers could provide a new model for oral surgical skills training in bone harvesting.  相似文献