Journal of Subatomic Particles and Cosmology

Kiyomoto S., Tanaka T., Miyake Y., Mitamura Y.

Ichihara H., Kuchii T., Yamadate M., Sakaguchi H., Uemura H., Kinoshita K.

Nagai T., Ikehara M., Kurematsu A.

Sakaki K., Yokota K., Ohno K., Suzuki K., Arisawa H.

Hamahashi S., Kitano H., Onami S.

Nakata T., Bao Y., Fujiwara N.

Takahashi T., Tokuda K., Kobayashi T., Kitamura T.

Kida M., Tonoike M., Utsuro T., Sato S.

This paper proposes a method of domain classification of technical terms using the Web. In the proposed method, it is assumed that, for a certain technical domain, a list of known technical terms of the domain is given. Technical documents of the domain are collected through the Web search engine, which are then used for generating a vector space model for the domain. The domain specificity of a target term is estimated according to the distribution of the domain of the sample pages of the target term. Experimental evaluation results show that the proposed method of domain classification of a technical term achieved mostly 90% precision/recall. We then apply this technique of estimating domain specificity of a term to the task of discovering novel technical terms that are not included in any existing lexicons of technical terms of the domain. Out of 1000 randomly selected candidates of technical terms per domain, we discovered about 100 to 200 novel technical terms. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(14): 11–19, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20852

Katayama Y., Hasegawa T., Takahashi N.

Doke M., Hamaguchi N., Hayashi M., Yagi N.

We propose a conversation method called seamless interaction where the viewer can query a CG generated performer at any time while viewing video content based on CG, and can interrupt video content for direct conversation with the performer. In this paper, we explain the important requirements for achieving seamless interaction, and show an example mounting these requirements. Then, we use a subjective evaluation test to compare seamless interaction with images of interaction with CG characters using dedicated conversational CG characters. From these results, we show that seamless interaction is an effective method for viewers when engaged in passive viewing, such as viewing a television program, in terms of ease of interaction and ease of familiarity. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(13): 1–14, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20833

Sato K., Nakashima M., Ito T.

Iwashita Y., Kurazume R., Konishi K., Nakamoto M., Hashizume M., Hasegawa T.

To create a textured virtual model of a real object, the 3D geometric model that is generally measured by a laser scanner must be aligned with the 2D image that is obtained from image sensors excluding some sensors for which geometric and photometric information are obtained at the same time. One conventional registration method that has been proposed compares the contour lines of the silhouette image of the 3D geometric model and of the 2D image and estimates the relative positions of both according to iterative calculations. However, a method that uses point correspondences of contour points in the 2D image and contour points of the silhouette image must find the nearest neighboring points for each iterative calculation, and the computational cost is high. Therefore, in this paper, the authors propose a new registration algorithm of grayscale images and 3D geometric models by using 2D distance maps that are constructed by using the Fast Marching Method from the boundary of an object on the grayscale image. They also show the effectiveness of the proposed method by performing simulation experiments and experiments using actual images. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(14): 5262, 2007; Published online in Wiley InterScience (). DOI 10.1002/scj.20634

Tachibana T., Murata Y., Shibata N., Yasumoto K., Ito M.

Miyata M., Shibata Y., Oguri K.

Dynamically reconfigurable processors such as the Dynamically Reconfigurable Processor (DRP) released by NEC Electronics are composed of many interconnected coarse-grained arithmetic blocks. Applications for DRP are described in a programming language like C and parallelism in the source code is automatically extracted by a compiler. At the same time, it is also important to optimize descriptions so that the potential performance of the device is effectively brought out. In this paper, we propose an optimized coding method to improve efficiency of parallel processing on DRP. In this technique, the same kind of multicycle operations are aggregated into single functions, keeping the sequential framework of a programming language. The effects of the method are evaluated with ray tracing processing as an example application. As a result, the proposed technique achieves 2.68 to 3.09 times performance improvement without large increase in the number of states nor severe degradation of the frequency. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(14): 20–28, 2007; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/scj.20780

Fujita Y., Nakase A., Nakayama Y., Toriumi F., Ishii K.

A variety of knowledge sharing methods have been proposed based on experience and precedents. However, the effects of these methods have never been quantitatively investigated. This study proposes a knowledge sharing model in organizations to analyze the effect of knowledge management. Knowledge sharing processes are modeled and simulated using a multiagent approach. Knowledge repositories and knowledge managers improve organization performance. Additionally the year 2007 issue is represented using the model and its solutions are also shown. © 2007 Wiley Periodicals, Inc. Syst Comp Jpn, 38(14): 110, 2007; Published online in Wiley InterScience (). DOI 10.1002/scj.20874