ITE Technical Report
Online ISSN : 2424-1970
Print ISSN : 1342-6893
ISSN-L : 1342-6893
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23.10
Displaying 1-7 of 7 articles from this issue
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  • [title in Japanese]
    Article type: Cover
    Pages Cover1-
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_Cover1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • [title in Japanese]
    Article type: Index
    Pages Toc1-
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_Toc1
    CONFERENCE PROCEEDINGS FREE ACCESS
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  • Wide Range Servo System Surpassing Resonance Mode
    Koji Saito, Goro Obinata, Kazuhiro Ouchi
    Article type: Article
    Session ID: VIR99-1
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_1
    CONFERENCE PROCEEDINGS FREE ACCESS
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    A wide range servo system for a magnetic head actuator was studied while considering the in-phase property. The in-phase property is defined for a special structure system whose transfer function is described as a summation of a rigid-body mode component and flexible mode components. When every flexible mode of its impulse reponse has the initial derivative of the same sign as the rigid-body mode, the system is in-phase. The in-phase property brings much higher control performance. We examined feasibilities of a wide frequency range surpassing resonance mode for a in-phase structure system of a magnetic head actuator. We also considered a methodology for designing a in-phase structure system.
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  • Reduction of head-disk friction using ultrasonic vibration spindle
    Tamotsu Mitsuyasu, Hitoshi Yanagisawa, Toshihiro Uehara, Haruo Okuda, ...
    Article type: Article
    Session ID: VIR99-2
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_9
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The surface of a hard disk is extremely flat so that a large amount of data can be stored at high density. This high degree of flatness, however, tends to cause the disk and the head to stick together when the disk is turned on and stopped, undermining the reliability of the hard disk device. To solve this problem, we have developed an ultrasonic vibration spindle mechanism that vibrates the sidk when it is turned on and off. Using this experimental spindle, we conducted an ultrasonic levitation experiment. The result shows that, by vibrating the spindle in a circular node mode, we can keep the head and the disk apart, drastically reducing the friction between them. Further, we placed a reflection plate in the space above the hard disk, finding that the acoustic power increased when the plate-disk distance was properly adjusted. This means that the spindle can be made much smaller.
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  • Analysis of Magnetization Process in Co-Cr Ultra-Thin Film Using the Anomalous Hall Effect
    Atsushi Sato, Kazuhisa Takayama, Shigeki Nakagawa, Masahiko Naoe
    Article type: Article
    Session ID: VIR99-3
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_17
    CONFERENCE PROCEEDINGS FREE ACCESS
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    The magnetic characteristics of a Co_<76>Cr_<24> ultra-thin film deposited on a SiO_2/Si substrate by facing targets sputtering, were measured by the anomalous Hall effect. The larger Hall voltage was detected when the thickness of the specimen became thinner. For the specimen with a sufficiently large magnetic anisotropy, the perpendicular magnetization was easily observed with a small magnetic field regardless of the angle of the applied field. The magnetization analysis using the Anomalous Hall effect will be useful for ultra-thin films of novel perpendicular magnetic recording media
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  • Wide-area distributed storage system
    Masahiro Ueno, Shigechika Kinoshita, Makoto Kuriki, Setsuko Murata, Sh ...
    Article type: Article
    Session ID: VIR99-4
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_23
    CONFERENCE PROCEEDINGS FREE ACCESS
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    We proposed wide-area distributed disaster-tolerant storage system. To guard against major disasters, member disks of RAID system, which enable improve data reliability and availability, were located a sufficient distance apart using Fibre channel technology. Our system was composed of some nodes and a network that enable communication between nodes. The nodes had RAID controller and the member disks controlled by other nodes. The RAID controller controlled the member disks located on the other nodes. This construction allowed plural organization to make backup effectively because network and places were shared. The RAID levels of the sytem are 0, 1 and 3. New protocol of Fibre channel was developed to improve data-transfer-rate when delay dueto long distance was large, and we confirmed its effect.
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  • [title in Japanese]
    Article type: Appendix
    Pages App1-
    Published: February 12, 1999
    Released on J-STAGE: June 23, 2017
    DOIhttps://doi.org/10.11485/itetr.23.10.0_App1
    CONFERENCE PROCEEDINGS FREE ACCESS
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