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Koki Toyokuni, Tadashi Wadayama
Article type: Article
Session ID: 17-3
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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Two-Dimensional Magnetic Recording (TDMR) requires advanced signal processing schemes. In order to develop and to evaluate such schemes, a computationally tractable simulation model for a TDMR system is indispensable. In this paper, an implementation of such a simulation model called a discrete Voronoi grain model is discussed.
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Atsushi MUSHA, Osamu SHIMIZU
Article type: Article
Session ID: 17-4
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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The optimum GPR target for Ba-ferrite tape systems was studied. The comparison among DC-free, DC-full, and DC-suppressed targets was made. Assuming GPRML detector with 16 or more Viterbi states, DC-free target generally showed the best bit error rate performance for both longitudinally and perpendicularly oriented media.
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Mitsunobu OKUDA, Yasuyoshi MIYAMOTO, Masahiko KISHIDA, Mayumi KAWANA, ...
Article type: Article
Session ID: 17-5
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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The magneto-optical observation method is quite useful technique for the real-time detection of magnetic domain locations in magnetic nanowires. In this study, we have fabricated 150-500 nm width [Co/Pd] nanowires with perpendicular magnetic anisotropy and succeeded to observe the magnetic domains by the magneto-optical imaging.
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Kazutaka OKINAKA, Yasuaki NAKAMURA, Yoshihiro OKAMOTO, Hisashi OSAWA
Article type: Article
Session ID: 18-1
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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The performances of the PRML systems are evaluated in a two-photon absorption recording channel model. The results show that the PR(1,2,2,2,1)ML system has the better performance compared with the PR(1,2,2,1)ML system.
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Toshiyuki Kitahara, Masaharu Akiba, Toshio Sasaki, Tatsuo Mikami, Hide ...
Article type: Article
Session ID: 18-2
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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Two types of novel two-photon sensitized recording media were developed; the fluorescent dye generation type media and fluorescent quench type media, and two-photon recording inside both the media using femtosecond laser was demonstrated. The signal modulation vs. recording power relationship showed quadratic dependency in both the media. The obtained fluorescent signal intensity from the quench type media is several times higher than that from the fluorescent dye generation type media.
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Takeshi KAJIYAMA, Daiichi KOIDE, Haruki TOKUMARU, Yoshimichi TAKANO, N ...
Article type: Article
Session ID: 18-3
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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This paper describes the aerodynamic stabilizing mechanism for flexible optical disks. Experimental analysis revealed that flexible optical disks have three states of axial run-out: decreasing axial run-out, increasing axial run-out, and turbulent airflow.
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Shogo NATSUI, Hisashi OSAWA, Yoshihiro OKAMOTO, Yasuaki NAKAMURA
Article type: Article
Session ID: 18-4
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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A simplification method of neural network equalizer(NNE) fitting in the recording code is studied in holographic data storage. A 40 percent reduction in the number of connections in the NNE is attained without performance degradation.
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Tetsuhiko MUROI, Nobuhiro KINOSHITA, Norihiko ISHII, Koji KAMIJO, Naok ...
Article type: Article
Session ID: 18-5
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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We evaluated the hologram distortion using optimized wavefront of reference beam that compensates for the distortion optically. Phase distributions of optimized wavefronts in every data page are different from original wavefront but they are similar to each other. This indicates that hologram distortions are similar in every data page.
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Norihiko ISHII, Tetsuhiko MUROI, Nobuhiro KINOSHITA, Koji KAMIJO, Naok ...
Article type: Article
Session ID: 18-6
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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We have already reported that the signal of single frequency pattern can be used for focus signal. A pick up method of focus signal using page data is proposed in this paper. We tried 3 types of mask pattern such as large circle, small circle, and straight line. Single frequency signal can be picked up using mask of small circle from page data. As the results, this signal can be used for focus servo signal and this method is feasible because of no additional patterns for data page or no additional optical elements.
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Junya Nishide, Akiyo Goto, Manabu Yamamoto
Article type: Article
Session ID: 18-7
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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We simulated the formation of diffraction gratings by using the diffusion model and analyzed their diffraction characteristics by beam propagation method and we examined a recording characteristics of the pulse recording by read/write simulation in the photopolymer medium.
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Akihito NAKAJIMA, Kensuke AKIEDA, Kiyoto KATAKURA, Manabu YAMAMOTO
Article type: Article
Session ID: 18-8
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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The improvement of the signal quality of the reproduction image is requested for the recording density improvement. This paper studies the Influence of reference wave aberration on signal quality.
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Toshiki Ishii, Ken-ichi Shimada, Makoto Hosaka, Taku Hoshizawa, Kevin ...
Article type: Article
Session ID: 18-9
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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We have developed the Monocular architecture as an attractive candidate for a compact holographic memory system and established a Monocular evaluation equipment to examine the feasibility of 500GB system. With the equipment, we confirmed high-density and contiguous book recording and analyzed the tolerance to clarify the technical difficulty.
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Yusuke Kanatake, Tomo Kishigami, Koichi Ikuta, Nobuo Takeshita
Article type: Article
Session ID: 19-1
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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We proposed a new WS (Write Strategy) optimization method with two-step search for BD(Blu-ray Disc). Jitter values of less than 7% were obtained with all evaluated discs and the effectiveness of the proposed method to optimize the WS was experimentally confirmed.
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Yasuo TAKEMURA
Article type: Article
Session ID: 19-2
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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New Demosaicing method for Bayer color filter array is presented. High sensitive and high S/N CMOS color camera will be realized using this method. If B/G or R/G component has nearly same value around G elements, we could estimate B or R signal from B/G or R/G using around the picture elements. Estimating virtual Bv signal is obtained from Bv=Gv×Ba/Ga where Ba is average B signal components around a G element and Ga is average G signal component around the G element, new B signal element could be taken the vacant B element area. Similarly, virtual Rv signal is obtained from Rv=Gv×Ra/Ga.
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Tetsuya KUNO, Koichi YAMASHITA, Takashi ITOW, Naoki IMAMURA, Ikuro SUG ...
Article type: Article
Session ID: 19-3
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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Conventional surveillance dome cameras have employed a slip ring between camera a head and body in order to pan endlessly. We have developed the technology of contactless image signal and power transmission, so that we make the life of cameras' panning much longer from a million revolutions to 20 million revolutions due to eliminating the slip ring, whose abrasion deteriorates cameras' life span. Images are transmitted by optical coupling and power is transmitted by inductive coupling. We also succeeded in making the unit of cameras' revolution smaller and thinner because a reduction gear and a ball bearing could be united.
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Yusuke YATABE, Mitsuhiro OKADA, Hironori KOMI
Article type: Article
Session ID: 19-4
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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This paper describes block and mosquito noise reduction. This technology is applied for 1080/60p video and located before edge enhancement block in digital TV system. Noise reduction is performed without referring detailed information of previous compression stage and executed by analyzing single-frame image data.
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Shuji Ishihara, Yoshihiro Machida, Tomochika Ozaki
Article type: Article
Session ID: 19-5
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
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In this paper, we describe a device control method for next generation audio-video equipment. The method is using USB over IP and cloud computing technology. By the method, we can use various devices for audio-video equipment.
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Keita Kaji, Kazuki Matsumoto, Hiroshi Sakata, Kazuo Ono, Kenji Watanab ...
Article type: Article
Session ID: 19-6
Published: August 31, 2010
Released on J-STAGE: May 24, 2017
CONFERENCE PROCEEDINGS
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A battery monitoring system, measuring voltage, current, temperature and impedance of lead storage battery, has been assembled from sensors, measuring circuits and Arduino. Impedances of lead storage battery are measured at the frequency of 1 and 10kHz.
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