• Title, Summary, Keyword: Recording

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Long-Term Data Stability Evaluation of BD-R according to Recording Speed for Archival Application (기록속도에 따른 BD-R의 데이터 장기보존 안정성 평가)

  • Lee, Kwan-Yong;Park, Sun-Joo;Jo, Yi-Hyung;Kim, Young-Joo
    • Transactions of the Society of Information Storage Systems
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    • v.8 no.2
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    • pp.50-55
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    • 2012
  • Optical disks are widely used in libraries and archives as digital data media due to their long-term storage stability. Though archive-grade optical disks are already available on the market, there is a relative less focusing on the reliable recording conditions. Commercial BD-R media were recorded at various recording speeds with the maximum speed of 6X, and tested at the acceleration aging conditions. Through the evaluation of long-term storage features by the data stability test, lower recording speed of 2x resulted in better long-term storage stability. In addition, degradation aspects of unstable long-term storage feature at outer region of disk were discussed.

A STUDY ON THE DESIGN OF SIMPLE RECORDING DEVICE TO TRACE THE MANDIBULAR MOVEMENTS (하악골운동 추적을 위한 단순기록장치 고안에 관한 연구)

  • Kim, Sang-Soo;Yoon, Chang-Keun
    • The Journal of Korean Academy of Prosthodontics
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    • v.25 no.1
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    • pp.253-267
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    • 1987
  • The purpose of this study was to improve limitations and disadvantages of the mechanical pantograph and the Visi-Trainer, and to design the reliable and reproducible device mandibular movement tracking device (MMTD) that is more simple, convenient and save the chair time than the mechanical pantograph and Visi-Trainer. MMTD was consist of head frame, horizontal bar, condylar path tracking stylus holders, anterior path tracking stylus holder, two condylar path plastic recording plates, one anterior path plastic recording plate, toggles and open occlusal clutch. To prove the reliability and reproducibility of MMTD, a five adults were selected and mandibular condylar movement was recorded one time by the mechanical pantographic tracing and MMTD. The border movement recording of the mandibular incisor (frontal, sagittal and horizontal) was also recorded by Visi-Trainer and the MMTD. The obtained results were as follows; 1. The condylar movement path (sagittal, horizontal) of the MMTD was not coincidence with that of mechanical pantograph. 2. Measurements of the angulation which established between working and balancing path records by use of the mechanical pantograph and MMTD, there was no significance. 3. In a view of MMTD's reproducibility, there was revealed almost similar recording pattern. 4. The border movement recording of the mandibular incisor by the MMTD and the Visi-Trainer showed almost same reliability and reproducibility. 5. The subjects were able to his original mandibular movements by use of open occlusal clutch in the MMTD.

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Measurement of Surface Pressure Fluctuations on a Rotating Blade Using a Digital Recording Device (Digital Recording Device를 ol용한 회전중인 블레이드 표면의 압력섭동 측정)

  • Yun, Jung-Sik;Kang, Woong;Sung, Hyung-Jin
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.29 no.10
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    • pp.1119-1129
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    • 2005
  • A new measurement system of wall pressure fluctuations on a rotating machinery, composed of digital recording device, was developed and evaluated. The small-sized digital recording device was attached on the rotating machinery and then was detached for data reduction. In order to obtain the system transfer function of the digital recording system, a dynamic calibration was performed utilizing the signal from a 1/8 inch B&K microphone as input. The time history of the unsteady pressure was then reconstructed from the output of the sensor by using this transfer function. The reconstructed pressure signals showed good agreement with the reference signal in both temporal and spectral sense. This sensor was then used to measure the wall pressure fluctuations on a rotating blade. An array of microphones were installed on the blade in the circumferential and radial directions. Various statistical moments were obtained from the measurement data set. Comparison of these quantities with the existing studies demonstrated satisfactory agreement. These tests give credence to the relevance and reliability of this device for applications in more complicated turbulent rotating machineries.

Annealing Effect of Co/Pd Multilayers on Magnetic Properties During Interdifusion

  • Kim, Jai-Young;Jan E. Evetts
    • Journal of Magnetics
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    • v.2 no.4
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    • pp.147-156
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    • 1997
  • An artificially modulated magnetic Co/Pd multilayer is one of the promising candidates for high density magneto-optic (MO) recording media, due to a 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 a MO recording technology is a kind of thermal recording which is conducted around Curie temperature (Tc) of the recording media, when the Co/Pd mulilayer is used for the MO recording media, changes in the magnetic properties are occurred as the amorphous structure do. Therefore, the assessment of the magnetic properties in the Co/Pd multilayer during interdiffusion is crucially important both for basic research and applications. As the parameter of the magnetic properties in this research, saturation magnetization and perpendicular magnetic anisotropy energy of the Co/Pd multilayer are measured in terms of Ar sputtering pressure and heat treatment temperature. Form the results of the research, we find out that the magnetic exchange energy between Co and Pd sublayers strongly affects the changes in the magnetic properties of the Co/Pd multilayers during the interdiffusion in ferromagnetic state. This discovery will provide the understanding of the magnetic exchange energy in the Co/Pd 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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An estimation technique for nonlinear distortion in high-density magnetic recording channels (고밀도 자기 기록 채널의 비선형 왜곡 추정 기법)

  • 이남진;오대선;조용수;김기호
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.22 no.11
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    • pp.2439-2450
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    • 1997
  • As recording densities increase in digital magnetic recording channels, the performances of digital detection techniques such as PRML and DFE degrade significantly due to nonlinear distortion in recording channels. The primary impediments for hgih-density recording are generally classified as nonlinear transition shift, which can be reduced substantially by the precompensation technique, and partial erasure which usually requires sophisticated nonlinear equalization techniques. In order to acheieve the highest density recording, accurate estimation of the parameters associated with these two noninear distortions is crucial. In this paper, a new estimation technique to distinguish these two different nonlinear effect using a proposed adaptive algorithm in time domain is presented. The effectiveness of the proposed adaptive approach to identify uniquely the nonlinear parameter with bias is demonstrated by computer simulation.

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Preparation of Co-Cr-Ta Thin Films using Two step Method For Perpendicular Magnetic recording Layer (Two-Step 방식을 이용한 수직자기 기록용 Co-Cr-Ta 박막의 제작)

  • 박원효;공석현;제우성;최형욱;박용서;김경환
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.17 no.7
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    • pp.793-796
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    • 2004
  • In order to improve c-axis crystalline orientation and high perpendicular coercivity of deposited ${Co}_77{Cr}_20{Ta}_3$perpendicualr recording layer, Two step method was investigated using a Facing Targets Sputtering System(FTS). The ${\Delta\theta}_50$ of ${Co}_77{Cr}_20{Ta}_3$recording layer deposited on seedlayer prepared at Room Temperature was as low as $5^\circ$, while that of the recording layer without seedlayer was about 11$^{\circ}$. The Two-Step method using ${Co}_77{Cr}_20{Ta}_3$seedlayer prepared at Room Temperature was shown to be very effective in controling the c-axis orientation of ${Co}_77{Cr}_20{Ta}_3$ recording layer with thin thickness.

Characterization of Photopolymers films containing triazine methacrylate monomer for photochromic diffractive image formation (광변색 회절 이미지 형성을 위한 트라이아진계 메타아크릴레이트 모노머를 포함한 광고분자 필름의 특성평가)

  • Oh, Hyun-Jin;Lee, Ji-Yea;kim, Eun-Kyoung
    • Transactions of the Society of Information Storage Systems
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    • v.3 no.4
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    • pp.173-177
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    • 2007
  • A photo-reactive methacrylate monomer having triazine as a core component was examined for photochromic diffractive image formation. Photochromic photopolymer films as a recording media contained a monomer mixture of triazine difunctional metharylate (DT) and ethylene glycol phenyl ether acrylate, binder polymer, photo initiator, and a photochromic spiro-oxazine dye. The content of photochromic dye was changed to examine the effect of photochromophore on diffraction efficiency and real holographic image formation. Holographic recording was performed on the photopolymer film by the combination of reference and probe beam. The diffraction efficiency of the photopolymer film in real-time measurement reached a maximum of $\sim90%$ within 30s. It was highly dependent on the photochromophore contents. After holographic recording, the color of the recorded area was changed under UV light (365 nm) and reversibly bleached to original color upon exposure to a visible light source. Films containing only photochromophore without monomer mixture were not reactive under the recording beam (491nm). Diffractive image formation and mechanism of the holographic recording in the presence of photochromophore will be presented.

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SmartPhone Recording System for Mobile Office Environment (모바일 오피스 환경을 위한 스마트폰 레코딩 시스템)

  • Kang, Euiseon;Kim, Jeonghun
    • The Journal of the Korea Contents Association
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    • v.13 no.9
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    • pp.49-57
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    • 2013
  • Recently, in spite of fast development of smartphone, recording technology has saved, listened and searched in server based on PSTN and wired network. We introduce a mobile transcript recording system for mobile office environment. All calls using smartphone are automatically saved on memory in mobile device with this system. Thereafter, recording files are encrypted and uploaded to recording server by user authority. Beside recording data in database on web server is saved and managed efficiently and economically through web application. This system is able to be used in legal corroborative facts and the prevention of crime such as voice phishing.

Studies on Deinking Properties of Recovered Paper for Manufacturing Eco-friendly Thermal Recording Paper (친환경 감열기록지 생산을 위한 순환제지자원의 탈묵 특성 연구)

  • Lee, Tai Ju;Choi, Do Chim;Kim, Moon Sung;Ryu, Jeong Yong
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.47 no.6
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    • pp.98-105
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    • 2015
  • Demands of thermal recording paper have been increased significantly by increase in usage of invoice, fax, and label. Thermal recording paper was mainly made based on virgin fiber. It is necessary to find a suitable alternative to virgin fiber in terms of environment protectional resources conservation. In this paper, deinking properties of different recovered papers were analyzed in order to use the recovered paper as raw material of thermal recording paper. Recovered paper were ONP, OMG and white ledger. Flotation reject of OMG was high because inorganic pigments in coating layer could be removed by upstream of froth. Brightness of white ledger and OMG were much higher than that of ONP. Therefore, properties of pulp made from the recovered paper could be enhanced with increase in blending ratio of white ledger and OMG. However, blending ratio of OMG caused the increase of flotation reject. Consequently, the optimum blending ratio of ONP, OMG, and white ledger was 3:3:3 for eco-friendly thermal recording paper. Under the condition, brightness was about 70% and ERIC was below 300 ppm.

A study on standardization & completion of transfer consultation record for patients transferred to emergency medical center (응급의료센터로 전원된 환자의 진료의뢰서 표준화 및 충실도에 관한 연구)

  • Yoou, Soonkyu;Kim, Kwang Hwan;Cho, Hae Kyung
    • The Korean Journal of Emergency Medical Services
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    • v.5 no.1
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    • pp.177-198
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    • 2001
  • The purpose of this research which was conducted by surveying the transfer consultation records from 360 medical institutions such as general hospitals, hospitals, clinics to the Emergency Medical Center at E University Hospital for six months(Jan. 1, 2000 - Jun. 30, 2000) are to standardize & complete transfer consultation record of hospitals at the 1st & 2nd referral level and to give patients transferred emergency medical center medical information services on a better quality. The conclusions and suggestions from this study were summarized as follows; (1) Examing the distribution of the referral medical consultation(transfer) sheet type, surgery part local clinic sheet types were 34.4%, medical part local clinic sheet types were 26.7%, undifferentiated local clinic sheet types were 23.9% and hospital level sheet types were 15.0%. (2) The items of the transfer consultation records had been standardized more than 75% in the order of patient's name, date, doctor's name, diagnosis, patient's status, impressions. (3) That the degree of recording completion on these items is in the order of patient's name, date, diagnosis, impressions was revealed. (4) Because the standardization and the degree of recording completion are very low in the patient's gender, age, address, electronic recording system was needed for more perfect input of initial patient informations. (5) This standardizing & complete recording on examination and medication will prevent re-examination and abuse of medication for patients transferred emergency medical center. (6) EMT Transfer System should be fixed in all medical institute for the standardizing & complete recording on care period and departure time will give many emergency patients the proper treatments at the proper time. (7) It was revealed that developing new standardized transfer consultation record & using electronic recording system are needed. (8) The complete recording & Fast Track System were needed for higher rate of bed operation at emergency medical center and more hospital profit.

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