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256 results on '"Ohki, Makoto"'

5. An Effective Nurse Scheduling by a Parameter Free Cooperative GA

Author

Ohki, Makoto, Kishida, Satoru, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Esparcia-Alcázar, Anna I., editor, and Mora, Antonio M., editor

Published
2014
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35. Scattering of Gaussian beam from a hemispherical boss on a conducting plane

Author

Sakurai, Haruo, Ohki, Makoto, Motojima, Kuniyuki, and Kozaki, Shogo

Subjects
Antennas (Electronics) -- Research, Business, Computers, Electronics, Electronics and electrical industries
Abstract

A new expression of a Gaussian beam derived by using a spectral domain method is applied to the scattering problem from a hemispherical boss on a conducting plane. On the method of images, the original problem is reduced to that of the scattering of two Gaussian beams by a full sphere. The scattered fields are expressed in simple closed forms which are valid when the diameter of the boss is comparable to or less than the Gaussian beamwidth. The difference between the bistatic radar cross section of a Gaussian beam and that of a plane wave is discussed. Index Terms--Boss, Gaussian beam, radar cross section (RCS), scattering.

Published
2004

36. A system for real time extraction of image outlines

Author

Yajima, Masao, Higashi, Katsuhisa, Kondo, Hideyuki, Inaba, Masanobu, Kondo, Yoshihito, Ohki, Makoto, and Hashiguchi, Sumihisa

Subjects
Image processing -- Digital techniques, Real-time data processing -- Research, Business, Electronics and electrical industries, Engineering and manufacturing industries
Abstract

A system for extracting image outlines at the television rate was developed. The system incorporates fourteen DSPs operating in parallel. The extraction is performed by applying a (3 X 2) mask which is the connection of a (2 X 1) smoothing mask and a (2 X 2) differentiating mask. The processing time of 32.7ms/frame for an image with 512 X 512 pixels X 8bits is attainable.

Published
1994

38. Electromagnetic scattering by the Luneberg lens with reflecting cap

Author

Sakurai, Haruo, Hashidate, Takeshi, Ohki, Makoto, Motojima, Kuniyuki, and Kozaki, Shogo

Subjects
Electromagnetic waves -- Scattering, Magnetic lenses -- Models, Microwaves -- Models, Business, Computers, Electronics, Electronics and electrical industries
Abstract

The near-field distribution in the case of the normal incidence to the Luneberg lens reflector is numerically obtained by using the modal expansion technique and point-matching method. As a model of the Luneberg lens, six different homogeneous media is used. A microwave experiment was also performed. Index Terms - Electromagnetic scattering, Luneberg lens reflector, microwave experiment, point-matching method.

Published
1998

50. Technique for calculation of the propagation constant in an optical planar waveguide with a Gaussian profile

Author

Kozaki, Shogo, Ohki, Makoto, Sasaki, Takayoshi, Sakurai, Haruo, and Motojima, Kuniyuki

Subjects
Waveguides -- Analysis, Transformations (Mathematics) -- Usage, Astronomy, Physics
Abstract

We performed analysis of a planar waveguide with arbitrary index variations. We obtained numerical results for the propagation coefficient by using first-order Langer and Liouville transformations. The accuracy of the numerical results is confirmed by a comparison with those obtained by other methods. [C] 2001 Optical Society of America OCIS codes: 230.0230, 230.7370, 230.7390, 260.2030.

Published
2001

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