• Journal of KSNVE
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• v.9 no.6
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• pp.1247-1258
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• 1999

This paper presents vibration control of a CD-ROM(compact disc-read only memory) drive feeding system consisting of a new type of CD-ROM mount using an electro-rheologocal(ER) fluid. Chemically treated starch particles and silicon oil are used for EF fluid, and its field-dependent yield stresses are experimentally distilled under both the shear and the flow modes. On the basis of the yield stress, an appropriate size of ER CD-ROM mount adapted to conventional feeding system is designed and manufactured. Vibration isolation performance of the proposed mount is evaluated in the frequency domain and compared with that of conventional rubber mount. The ER CD-ROM mount is then installed to the drive feeding system and the system equation of motion is derived. The skyhook controller is then incorporated with the fuzzy technique to improve the performance of ER CD-ROM mount. A set of fuzzy parameters and control rules are obtained from a relation between vertical displacement and pitching motion of the feedng system. Followingthe formulation of the fuzzy-skyhook controller, computer simulation is undertaken in order to evaluate vibration suppression of the CD-ROM drive feeding system subjected to various excitations.

• Journal of the Korea Computer Industry Society
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• v.7 no.3
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• pp.205-215
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• 2006

In this paper, a method how to make Programmable Logic Array (PLA) design and inspection of circuit relative to recent 64bit microprocessor simple and easy was discussed. A design method using Random Access Memory (RAM), Read Only Memory (ROM) and PLA has been settled down in Very Large Scale Integrated Circuit (VLSI) and logical design, modifying circuit and inspection are easy in PLA so it holds fairly good advantages in the aspect of performance and cost. It is expected PLA will also occupy an important position as a basic factor in designing VLSI in the future.

• Convergence Security Journal
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• v.15 no.3_1
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• pp.99-105
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• 2015

A typical SRAM-based PUF is used in random number generation and key exchange process. The generated out puts should be preserved, but the values are changed owing to the external environment. This paper presents a new D-PUF logic employing a dual anti-fuse OTP memory to the SRAM-based PUF. The proposed PUF can enhance the reliability of the logic since it can preserve the output values. First, we construct the OTP memory using an anti-fuse. After power up, a SRAM generates the random values owing to the mismatch of cross coupled inverter pair. The generated random values are programed in the proposed anti-fuse ROM. The values that were programed in the ROM at once will not be changed and returned. Thus, the outputs of the proposed D-PUF are not affected by the environment variable such as the operation voltage and temperature variation, etc. Consequently, the reliability of the proposed PUF will be enhanced owing to the proposed dual anti-fuse ROM. Therefore, the proposed D-PUF can be stably operated, in particular, without the powerful ECC in the external environment that are changed.

• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.119-123
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• 2005

We report the random pattern characteristics of the super resolution near field structure(Super-RENS) write once read-many(WORM) disc at a blue laser optical system(laser wavelength 405nm, numerical aperture 0.85) and the Super-RENS read only memory(ROM) disc at a blue laser optical system(laser wavelength 659nm, numerical aperture 0.65). We used the WORM disc of which carrier-to-noise ratio (CNR) of 75nm is 47dB and ROM disc of which carrier-to-noise ratio (CNR) of 173nm is 45dB. We controlled the equalization (EQ) characteristics and used advanced partial-response maximum likelihood (PRML) technique. We obtained bit error rate (bER) of 10-3 level at 50GB WORM disc and bite error rate of 10-4 level at 50GB level ROM disc. This result shows high feasibility of Super-RENS technology for practical use.

• Transactions of the Society of Information Storage Systems
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• v.2 no.1
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• pp.38-42
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• 2006

We report the random pattern characteristics of the super resolution near field structure(Super-RENS) write once read-many(WORM) disc at a blue laser optical system(laser wavelength 405nm, numerical aperture 0.85) and the Super-RENS read only memory(ROM) disc at a blue laser optical system(laser wavelength 659nm, numerical aperture 0.65). We used the WORM disc of which carrier-to-noise ratio(CNR) of 75nm is 47dB and ROM disc of which carrier-to-noise ratio(CNR) of 173nm is 45dB. We controlled the equalization(EQ) characteristics and used advanced partial-response maximum likelihood(PRML) technique. We obtained bit error rate(bER) of 10-3 level at 50GB WORM disc and bite error rate of 10-4 level at 50GB level ROM disc. This result shows high feasibility of Super-RENS technology for practical use.

• Journal of Institute of Control, Robotics and Systems
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• v.5 no.1
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• pp.47-53
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• 1999

CD-ROM(Compact Disk-Read Only Memory) is very attractive storage media because it has much storage space but is small size and portable. Optical pickup, one of the most important parts for reading data on a CD-ROM, is not produced tuned up. For the use of goods, we must tune up the optical pickup by adjusting the screw for adjustment. First, we developed analog servo system for optical pickup tuners. For eliminating some problems in analog servo system, this paper designed the modeling of digital servo system for optical pickup tuner. Though the characteristics of optical pickup are changed, the digital servo system for optical pickup tuner can easily apply to all pickup, and can reduce the measurement error among the optical pickup tuners. For the purpose of confirming the designed digital servo system, we produced data that specify the disk vibration and the disk eccentricity, and simulated servo system with MATLAB.

• 정보저장시스템학회:학술대회논문집
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• 2005.10a
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• pp.32-37
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• 2005

We developed a numerical simulator in order to study the Super-RENS/ROM (Super REsolution Near-Field Structure, Read Only Memory) using 3-dimensional FDTD (finite difference time domain) method. The simulation can be performed by three steps. In the first step, we utilized the vector-diffraction theory to calculate the characteristics of incident laser beam from the object-lens to the surface of the disk. At the second step, we fed the calculated result as an input for the main FDTD simulations on the optical layers in the disk structure. After performed the FDTD simulations, we took near-to-far field transformation for the reflected signal, from the surface of the disk to the detector. Finally, we can get reflected signal at the photo-diode. Using this developed simulator, we were able to study about the reading signal from various disk structures as a function of a laser beam position. We calculated reading signals for various pit sizes for Super-ROM structure, and it is found that the simple optical diffraction theory can not explain the reading mechanism of Super-ROM, and more complicated temperature dependent physics must be involved.

• Transactions of the Society of Information Storage Systems
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• v.2 no.2
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• pp.138-143
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• 2006

We developed a numerical simulator in order to study the Super-RENS/ROM (Super REsolution Near-Field Structure, Read Only Memory) using 3-dimensional FDTD (finite difference time domain) method. The simulation can be performed by three steps. In the first step, we utilized the vector-diffraction theory to calculate the characteristics of incident laser beam from the object-lens to the surface of the disk. At the second step, we fed the calculated result as an input for the main FDTD simulations on the optical layers in the disk structure. After performed the FDTD simulations, we took near-to-far field transformation for the reflected signal, from the surface of the disk to the detector. Finally, we can get reflected signal at the photo-diode. Using this developed simulator, we were able to study about the reading signal from various disk structures as a function of a laser beam position. We calculated reading signals for various pit sizes for Super-ROM structure, and it is found that the simple optical diffraction theory can not explain the reading mechanism of Super-ROM, and more complicated temperature dependent physics must be involved.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.12B
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• pp.2039-2045
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• 2000

본 논문에서는 계산이 간단한 두 가지의 GMSK (Gaussian minimum shift-keying) 변조기들을 제안한다. 제안된 방법들에서는 필터링과 적분과정의 순차적인 처리 대신에, 필터링되는 데이터 계열들에 따른 적분기 출력에서의 위상 성분들을 미리 구하고, ROM (read only memory)에 저장함으로써 계산량을 크게 줄일 수 있다. 첫 번째 방법에서는 필터링되는 심벌들에 따른 각 샘플시점에서의 위상 변화량들이 미리 계산되며, 위상 샘플 값은 필터에 입력되는 데이터 계열에 의한 샘플시점에서의 총 위상 변화량을 구하여 누적함으로써 얻어진다. 두 번째 방법에서는 입력되는 모든 가능한 데이터 계열들에 따른 모든 샘플시점에서의 총 위상 변화량들을 미리 구하여 ROM에 저장하며, 위상 샘플 값은 입력되는 데이터 계열에 따라 샘플시점에 해당하는 총 위상 변화량을 선택하여 누적함으로써 얻어진다. 또한, 두 번째 방법에서는 데이터 계열의 패턴에 따른 총 위상 변화량들의 대칭적인 성질을 이용함으로써 필요한 메모리량을 줄일 수 있다.

• Journal of Information Processing Systems
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• v.14 no.3
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• pp.600-606
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• 2018

Smart city is currently the main direction of development. The automatic management of instrumentation is one task of the smart city. Because there are a lot of old instrumentation in the city that cannot be replaced promptly, how to makes low-cost transformation with Internet of Thing (IoT) becomes a problem. This article gives a low-cost method that can identify code wheel instrument information. This method can effectively identify the information of image as the digital information. Because this method does not require a lot of memory or complicated calculation, it can be deployed on a cheap microcontroller unit (MCU) with low read-only memory (ROM). At the end of this article, test result is given. Using this method to modify the old instrumentation can achieve the automatic management of instrumentation and can help build a smart city.