• Title, Summary, Keyword: Recording

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Changes in the Modulation Amplitude and the Particle Sizes of Co/Pd Multilayers During Stress Release and Interdiffusion

  • Kim, Jai-Young;Evetts, Jan-E
    • Journal of Magnetics
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    • v.3 no.1
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    • pp.21-30
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    • 1998
  • An artificially modulated magnetic Co/Pd multilayer is one of the promising candidates for high density magneto-optic (MO) recording media, due to large Kerr rotation angle in the wavelength of a blue laser beam. however, since multilayer structure, as well as amorphous structure, is a non-equilibrium state in terms of free energy and MO recording is a kind of thermal recording which is conducted aound Curie temperature (Tc) of the recording media, when the multilayer is used for the MO recording media, changes in the multilayer structure are occurred as the amorphous structure do. Therefore, the assessment of the structural stability in the Co/Pd multilayer is crucially important both for basic research and applications. As the parameter of the structural stability in this research, modulation amplitude and particle size of the Co/Pd multilayer are measured in terms of Ar sputtering pressure and heat treatment temperature. From the results of the research, we find out that the magnetic exchange energy in the structural changes of a magnetic multilayer structure and suggest the operating temperature range for MO recording in the Co/Pd multilayer for the basic research and applications, respectively.

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A Study on the Location and Design of Medical Recording Department Accoding to the Computerizing Level (전산화 수준에 따른 의무기록부의 위치 및 평면계획에 관한 연구)

  • Ryu, Jae-Kwon;Lee, Nak-Woon
    • Journal of The Korea Institute of Healthcare Architecture
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    • v.2 no.3
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    • pp.35-43
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    • 1996
  • The paper chart of medical record had been used as an important medium of the medical information in the medical recording department. This chart has not dealt with the development of information industry and the change of use of medical record in several decades. This study is to show the data which is helpful for the current spacial situation of medical recording in Korea and understand problems to reconsider the medical recording department of hospital architectural plan. In addition, this study is to look for the spacial changes by computerizing of medical recording and its special confrontation and the prospect for the future medical recording department which is going to work as a medical information center.

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Diffraction Efficiency Analysis of Silver Halide Film for Color Holography Recording

  • Park, Sung Chul;Kim, Sang Il;Son, Kwang Chul;Kwon, Soon Chul;Lee, Seung Hyun
    • International Journal of Internet, Broadcasting and Communication
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    • v.7 no.2
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    • pp.16-27
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    • 2015
  • Holography technology which was developed by Dennis Gabor (1900~1979) in 1948 is a technology to record wave planes of actual 3D objects. It is known as the only technology which can express 3D information most perfectly close to human-friendly. Holography technology is widely used in advertisement, architecture and arts as well as science technology areas. Especially, digital holographic print which is an applied area is greatly used in military map, architecture map and cultural asset restoration by printing and reproducing 3D information. Holography is realized by recording and reproducing the amplitude and phase information on high resolution film using coherent light like laser. Recording materials for digital holographic printer are silver halide, photoresist and photopolymer. Because the materials have different diffraction efficiency according to film characteristics of each manufacturer, appropriate guide lines should be suggested through efficiency analysis of each film. This paper suggests appropriate guide lines through the diffraction efficiency measurement of silver halide which is a holographic printer recording medium. And the objective of this study is to suggest appropriate guide lines through diffraction efficiency analysis of Ultimate 08-C and PFG-03C which are commercially used. The experiment was prepared by self-diffraction efficiency system which measures the strength with the defector by penetrating RGB recording medium and concentrating diffracted beams through collimating lens. The experiment showed Geola's PFG-03C which is a silver halide for full color has price/performance advantage in optical hologram recording, but recording angles and reproduction angles are irregular for digital holographic printer recording. Ultimate's Ultimate08-C for full color shows its diffraction efficiency is relatively stable and high according to recording angles and laser wavelength.

The Effects of Recording Interval on the Estimation of Grazing Behavior of Cattle in a Daytime Grazing System

  • Hirata, M.;Iwamoto, T.;Otozu, W.;Kiyota, D.
    • Asian-Australasian Journal of Animal Sciences
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    • v.15 no.5
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    • pp.745-750
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    • 2002
  • The effects of recording interval (1, 2, 3, 4, 5, 10, 15, 20 and 30 min) on the estimation of some grazing behavior variables in beef cows and calves (<4 months old) were investigated in a daytime grazing (7 h) system utilizing a bahiagrass (Paspalum notatum Flugge) pasture (a 1.1 ha paddock and a 0.4 ha resting area). Recording intervals of 10-30 min tended to underestimate the time spent grazing and ruminating and overestimate the time spent resting by animals, whereas intervals of 1-5 min resulted in almost constant estimates. In all grazing activities, the errors of estimation became larger when the recording interval exceeded 5 min. The accuracy of estimation was higher for grazing time>rumination time>resting time. An increase in recording interval always decreased estimates of the distance walked by animals. It was concluded that recording intervals of 1-5 min provide reliable estimates of the time spent grazing, ruminating and resting. It was also concluded that positioning of animals at 1 min intervals may provide estimates of walking distance with acceptable bias toward underestimation.

New Modulation and Detection Method to Reduce Physical Address Reading (광디스크의 물리어드레스 독출에러를 줄이기 위한 변조 및 검출방법)

  • Shim, Jae-Seong;Kim, Ki-Hyun;Park, Hyun-Soo;Park, In-Sik;Seo, Joong-Eon;Shin, Dong-Ho
    • Proceedings of the KIEE Conference
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    • pp.2505-2507
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    • 2001
  • The RF signal is distorted since the cross-talk noise from adjacent tracks and ISI(Inter Symbol Interference) is also incresed as recording density is increased. These cross-talk noise and ISI are main reason of reading error for the embossed pits on the disc. In this study we suggest a new coding method, spaced modulation technique and a detection technique for the spaced modulation. We report the result shows detection performance is improved when we use the suggested spaced modulation code and the detection technique instead of conventional modulation code.

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Determination of Acceptor Concentration by Use of Recording Dynamics of Photorefractive Holograms Under Low-Intensity Condition in LiNbO3

  • Rhee, Bum-Ku;Kim, Bong-Gi;Shin, Seung-Ho
    • Journal of the Optical Society of Korea
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    • v.7 no.3
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    • pp.197-201
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    • 2003
  • We investigated recording dynamics of a holographic grating in the photorefractive LiNbO$_3$ crystal under the low-intensity condition of recording beams. New expressions for the space-charge field and the recording time constant were obtained by solving the Kukhtarev equations under the global space -charge field, which is induced in the previous process of recording and erasing. Their validity can be confirmed by considering the limit that the period of the grating goes to infinity both theoretically and experimentally. It was found that the new expression for the recording time constant allows us to determine acceptor concentration to be $1.2${\times}$10^{21}m^{-3}$ for pure LiNbO$_3$ crystal and 2.5${\times}$$10^{21}m^{-3}$ for the 0.1 mol% iron doped LiNbO$_3$ crystal from the measured ratio of the recording time constant under the extremely large grating condition, in which the diffusion effect can be neglected, to that under the small grating condition.

Optimal Design of Optical Flying Head for Near-field Recording (근접장 기록을 위한 부상형 광학 헤드의 최적설계)

  • 윤상준;김석훈;정태건;김수경;최동훈
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.13 no.10
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    • pp.785-790
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    • 2003
  • This paper presents an approach to optimally design the air-hearing surface (ABS) of the optical flying head for near-field recording technology (NFR) NFR is an optical recording technology using very small beam spot size by overcoming the limit of beam diffraction. One of the most important problems in NFR Is a head disk interface (HDI) issue over the recording band during the operation. A multi-criteria optimization problem is formulated to enhance the flying performances over the entire recording band during the steady state. The optimal solution of the slider, whose target flying height is 50 nm, is automatically obtained. The flying height during the steady state operation becomes closer to the target values than those for the Initial one. The pitch and roll angles are also kept within suitable ranges over the recording band. Especially. all of the all-hearing stiffness are drastically increased by the optimized geometry of the air hearing surface.

Optimal Design of Optical Flying Head for Near-Field Recording (NFR 방식 Optical Flying Head의 형상 최적설계)

  • 김석훈;윤상준;최동훈;정태건;박진무;김수경
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • pp.1165-1169
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    • 2003
  • This paper presents an approach to optimally design the air-bearing surface (ABS) of the optical flying head for near-field recording technology (NFR). NFR is an optical recording technology using very small beam spot size by overcoming the limit of beam diffraction. One of the most Important problems in NFR is a head disk interface (HDI) issue over the recording band during the operation. A multi-criteria optimization problem is formulated to enhance the flying performances over the entire recording band during the steady state. The optimal solution of the slider, whose target flying height is 50 nm, is automatically obtained. The flying height during the steady state operation becomes closer to the target values than those fur the initial one. The pitch and roll angles are also kept within suitable ranges over the recording band. Especially, all of the air-bearing stiffness are drastically increased by the optimized geometry of the air bearing surface.

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Software Buffering Technique For Real-time Recording of High Speed Satellite Data

  • Shin, Dong-Seok;Choi, Wook-Hyun;Kim, Moon-Gyu;Park, Won-Kyu
    • Korean Journal of Remote Sensing
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    • v.18 no.3
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    • pp.147-153
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    • 2002
  • The real-time reception and recording of down-link mission data from a satellite requires the highest reliability because the data lost in receiving process cannot be recovered. The data receiving and recording system has moved from a set of dedicated hardware and software components to commercial-off-the-shelf (COTS) components in order to reduce the system cost as well as to upgrade the system easily for handling other satellite data. The use of COTS hardware and middleware components prevents the system developer from correcting or modifying the internal operations of the COTS components, and hence, instant performance degradation of the COTS components which affects the reliable data acquisition must be covered by a software algorithm. This paper introduces the instant performance problem of a COTS data recording device which leads to the data loss in the real-time data reception and recording process. As a result, the requirement of the modification of the conventional data read/write technique is issued. In order to overcome the data loss problem due to the use of COTS components and the conventional software technique, a new algorithm called a software buffering technique is proposed. The experiments show that the application of the proposed technique results in reliable real-time reception and recording of high speed serial data.

Analysis of Reproducing Characteristics in Perpendicular Magnetic Recording System Using Preisach Model (Preisach 모델을 이용한 수직자기기록장치의 재생특성 해석)

  • 박관수;이향범;이택동;장평우
    • Journal of the Korean Magnetics Society
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    • v.2 no.1
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    • pp.50-55
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    • 1992
  • Numerical method for analyzing the reading process in magnetic recording system is described. Hysteresis characteristics must be included in numerical analysis not only recording process but also reading process because of hysteretic behavior of recording media. Algorithm which is consisted of finite clement method for numerical analysis and Preisach model considered to be more appropriate method than Stoner-Wohlfarth model with spin curling mode for describing hysteresis characteristics is constructed. Equations to calculate waveform of reproduced voltage is proposed. Then, this is applied to perpendicular magnetic recording systems with pole type head and double layer media. Waveform of magnetic flux density and reproduced voltage induced in head coil is obtained. If the recording current increase in recording process, magnitude of reproduced voltage in reproducing process saturates. From this saturation curve, value of current which produce maximum voltage can be obtained.

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