• Transactions of the Society of Information Storage Systems
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• v.2 no.1
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• pp.65-70
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• 2006

In the information storage development, the trend of the storage device is to increase the recording density. Among such an effort, near-field probe recording is spotlighted as a method of high increasing recording density. For the successfully embodiment of storage device, the actuating mechanism of near-field probe is essentially designed. In this paper, we suggest the slider similar with conventional HDD and design the slider using near-field probe for the purpose of applying the slider in order to control gap between probe and media. The most important object of slider design is to guarantee the flying ability and stability. For achievement of these design objects, we perform two step of optimal design process. The media is supposed to model as random displacement, which is only considered roughness of disk surface. The design slider is analyzed with dynamic state in assumed media. At this process, the optimal model is confirmed to stable flying stability.

• Journal of Technologic Dentistry
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• v.10 no.1
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• pp.177-183
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• 1988

This paper aims to examine ceramic shade prescriptions for work authorizations in all its aspectclincal information, recording information, technical considerations, extended application, practical applications. The results are as follows : 1. The basic application provides essential data for ceramic veneer fabrication. 2.Three-dimensional information divides the space for body and enamel components. 3. The second body shade selection improves shade matching in the middle one-third of the tooth and enhences the appearance of the enamel component. 4. Ceramists are encouraged to recognize the influence each component has upon the total shade composition. 5. A format is established for recording clinical information. 6. The use of available ceramic systems is seemingly unlimited. The method presented provides flexisility for recording the most detailed shade information in simple graphic and verbal terms. 7. Technical simplification is a by-product of complete, precise work information.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.297-298
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• 2008

A new equalization method for perpendicular magnetic recording channels is proposed. The proposed equalizer incorporates the Gaussian sum approximation into a Kalman filtering framework to mitigate inter-symbol interference in perpendicular magnetic recording systems. The proposed equalizer consists of a bank of linear equalizers using the Kalman filtering algorithm and its output is obtained by combining the outputs of linear equalizers through the Gaussian sum approximation.

• Proceedings of the IEEK Conference
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• 2000.06e
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• pp.110-112
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• 2000

Recently, the interest and the importance of the signal monitoring and recording during sleep is increasing. Conventional paper based recording systems are being replaced by digital type and polysomnographic system. We developed special digital signal processor system for the polysomnographic recording. This system consists of digital signal processing part and PC interface part for user's convenience. This system includes two digital filters, one fur low pass filtering of high frequency noise and the other for notch filtering of 60Hz AC noise. This system can be used for the efficient and convenient measurement of polysomnographic signals and also can be developed for the portable use.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 1988.05a
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• pp.74-77
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• 1988

This paper reports the properties of antireflection structure and hole formation of Te-based systems. The optical-recording characteristics of metallic recording media are enhanced significantly by incorporating the metal(Al) layer into an antreflection trilayer structure. Due to the interface condition inherent in the design of the trilayer structure, reflectivity from holes is ranked low fraction (<10%). The hole formation is carried by $Ar^+$ Laser(488nm). For 20nsec pulse duration, hole opening power(threschold) of $(Te_{86}Se_{14})_{50}Bi_{50}$ trilayer is lower than that of monolayer that used in this experiment. Hole shapes of the whole sample were clean.

• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.185-189
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• 2005

We reported here nano-scale electrical phase-change recording in amorphous $Ge_2Sb_2Te_5$ media using an atomic force microscope (AFM) having conducting probes. In recording process, a pulse voltage is applied to the conductive probe that touches the media surface to change locally the electrical resistivity of a film. However, in contact operation, tip/media wear and contamination could major obstacles, which degraded SNR, reproducibility, and lifetime. In order to overcome tip/media wear and contamination in contact mode operation, we adopted the W incorporated diamond-like carbon (W-DLC) films as a protective layer. Optimized mutilayer media were prepared by a hybrid deposition system of PECVD and RF magnetron sputtering. When suitable electrical pulses were applied to media through the conducting probe, it was observed that data bits as small as 25 nm in diameter have been written and read with good reproducibility, which corresponds to a data density of $1 Tbit/inch^2$. We concluded that stable electrical phase-change recording was possible mainly due to W-DLC layer, which played a role not only capping layer but also resistive layer.

• Proceedings of the Korean Magnestics Society Conference
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• 2007.05a
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• pp.178.2-178.2
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• 2007

• Transactions of the Society of Information Storage Systems
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• v.3 no.3
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• pp.123-125
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• 2007

We report the readout stability improvement results of super-resolution near field structure (Super-RENS) writeonce read-many (WORM) disk at a blue laser optical system. (Laser wavelength 405nm, numerical aperture 0.85) By using diffusion barrier structure (GeSbTe sandwiched by GeN) and high transition temperature recording material ($BaTiO_3$), material diffusion of phase change layer and recording mark degradation were greatly improved during high power (Pr=2.0mW) readout process up to $1{\times}10^5$ times.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2007.11a
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• pp.33-37
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• 2007

최근 멀티미디어 서비스는 동영상 압축 기술 및 네트워크의 발달을 기반으로 하여 다양한 응용 서비스를 제공하고 있으며, 이 중 화상 회의 시스템은 이 두 가지 기술이 효과적으로 사용된 대표적인 예이다. 원격 사용자간의 원활한 의사전달을 위해 고려된 화상회의 시스템은 효과적인 응용 서비스로 분류되고 있지만, 이러한 서비스 제공을 위한 기술을 이용하여 빈도가 훨씬 많은 일반적인 회의를 지원하는 응용서비스는 드문 편이다. 본 논문에서는 얼굴 정보와 화자 정보를 기반으로 오프라인 회의를 보조하는 시스템을 제안한다. 제안된 시스템은 소규모의 마이크와 캠을 이용하여 화자의 위치를 파악하고 캠에서 얻어진 정보를 이용하여 얼굴 영역 정보를 분석하고 인식한 후 화자 정보를 추출하여 발언자들을 추적 하여 기록하는 기능을 제공한다.

• Journal of the Korean Institute of Telematics and Electronics B
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• v.33B no.11
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• pp.83-96
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• 1996

On PR-IV magnetic recording systems, the maximum likelihood sequence detection (MLSD) method is optimum. But it has the problem of the complexity of the structure. The three level detection (TLD) method can be used, which has simpler structure than MLSD, but requires almost twice of power to achieve the same probbility of error as MLSD does. Therefore a new detection method (error controlled detection: ECD) is proposed which has much simpler structure than MLSD and gives much better performance than TLD. The simulation resutls show that the performance of ECD is better than that of TLD by approximaterly 0.5~1.3dB both in linear and nonlinear channels.