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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of the Society of Information Storage Systems
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The Society of Information Storage Systems
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Volume & Issues
Volume 6, Issue 2 - Sep 2010
Volume 6, Issue 1 - Mar 2010
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A Design of RAID-1 Storage using Hard Disk Drive and Flash Memory Drive
Byun, Si-Woo ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 41~46
Recently, Flash Memory Drives are one of the best media to support portable and desktop computers' storage devices. Their features include non-volatility, low power consumption, and fast access time for read operations, which are sufficient to present flash memories as major database storage components for desktop and server computers. However, we need to improve traditional storage management schemes based on HDD(Hard Disk Drive) and RAID(Redundant Array of Independent Disks) due to the relatively slow or freezing characteristics of write operations of SSDs, as compared to fast read operations. In order to achieve this goal, we propose a new storage management scheme called Hetero-Mirroring based on traditional HDD mirroring scheme. Hetero-Mirroring-based storage management improves RAID-1 operation performance by balancing write-workloads and delaying write operations to avoid SSD freezing.
Characteristics of 5/8 Modulation Code of Misalignments for Holographic Data Storage
Kim, Jin-Young ; Lee, Jae-Jin ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 47~51
We investigate misalignment characteristics of 5/8 modulation code for holographic data storage. The 5/8 modulation code does not have any isolated patterns that is the most unwanted problem for holographic data storage. As the results, the 5/8 modulation code showed a strong side of misalignments, and the code has the best performance among uncoded, 5/9, and 6/8 modulation codes when there are large misalignments.
Polarization Multiplexing Method for Micro Holographic Storage
Min, Cheol-Ki ; Kim, Do-Hyung ; Park, No-Cheol ; Yang, Hyun-Seok ; Park, Kyoung-Su ; Park, Young-Pil ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 52~56
In this paper, we investigate the polarization multiplexing for micro holographic storage. The proposed multiplexing method is performed by using crystal media that use photorefractive materials such as Fe-doped
. We discuss the feasibility of fast recording, high capacity and transfer rate for polarization multiplexing method. Finally, we experimentally verify the proposed method using polarization selectivity.
Analysis of Power Loss of an Optical Disc Drive due to the Tilting Motion of a Rotating Disc
Chong, H.Y. ; Sung, S.J. ; Jang, G.H. ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 57~62
This paper measured and analyzed the source of total power loss of an ODD of a notebook computer. It shows that the biggest power loss is the windage loss due to the friction between rotating disk and surrounding air. It measured the power loss by the tilting motion of a rotating disc which is originated from the unbalanced mass of the rotating disc or the squareness between case-rotor and shaft. The power loss of rotating disc due to tilting motion was also calculated by using FLUENT, and it was correlated with the measured one. This paper shows that the one of the effective methods to reduce the power loss of an ODD is to reduce the tilting motion of a rotating disc.
Real-time Beam Exposure Time Control of Holographic Data Storage
Han, Cho-Lok ; Kim, Nak-Yeong ; Song, Hee-Chan ; Lim, Sung-Yong ; Park, No-Cheol ; Park, Young-Pil ; Yang, Hyun-Seok ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 63~67
Holographic data storage system is one of next generation high density optical memories. Thereby storing multiple data pages using multiplexing method in one spot, we can achieve high store density and fast access time. However, for uniform writing, we must control exposure time properly by the change of writing material characteristics. Many studies have been investigated about exposure time scheduling. However, once it is decided, we cannot change the scheduled time. Therefore, it is hard to obtain uniform data intensity. In this study, we propose exposure time control method using additional red beam as the monitoring signal. Through reconstructed red beam intensity in real time, we can adjust exposure time by the writing condition change. We construct compensation method mathematically and verify the feasibility of proposed method through the experiments.
Tribological and Optical Characteristics of Silica Coating for Anti-reflection Coating of Solar Cell
Kim, Hae-Jin ; Kim, Dae-Eun ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 68~73
The interest in acquiring high efficiency solar cells has been steadily increasing due to various advantages such as low-cost installation, pollution free and everlasting energy generation. In order to raise the cell efficiency, there has been a lot of effort to develop effective anti-reflection coatings. In this work, the main objective was to investigate the effects of particle size and annealing temperature of silica anti-reflection coatings to maximize the cell efficiency as well as reliability. It was shown that the light transmittance could be increased by a few percent over a certain range of wavelength using the silica coating. Also, the tribological properties of the coating could be improved through the annealing process, which led to better reliability of the coating.
Study on Friction Effect for Optical Image Stabilization Actuator with Ball Bearing
Kim, Choong ; Song, Myeong-Gyu ; Son, Dong-Hun ; Park, Kyoung-Su ; Park, No-Cheol ; Park, Young-Pil ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 74~78
In this paper, 2-axis driving mechanism, which uses voice coil motor (VCM), is proposed to measure the friction force. The proposed VCM actuator consists of two parts; structural part and magnetic circuit part. Structural part is simplified to perform the friction experiments. Magnetic circuit part is composed of two parts. The experiments are accomplished by changing the mass of moving part. Through the experiments, optimal dimension is selected. Finally, the experimental results are verified and the optimal case is applied to the 2-axis driving mechanism, optical image stabilization actuator.
Feasibility study on realization of high resolution solid immersion lensbased near-field microscopy by use of an annular aperture
Moon, H.B. ; Yoon, Y.J. ; Kim, T.S. ; Park, Y.P. ; Park, N.C. ; Park, K.S. ;
Transactions of the Society of Information Storage Systems, volume 6, issue 2, 2010, Pages 79~82
In optical imaging systems, such as microscopes, high resolution exposure systems, and optical storage devices, higher optical resolution is a requirement. One of the promising technologies that is able to satisfy this requirement with relatively simple construction and reliable performance are, solid immersion lens (SIL)-based near-field (NF) optical systems. High NA optical systems using annular apertures have been investigated as one solution to achieve higher resolutions and an extended focal depth. By applying an optimized annular aperture to convention SIL optical head resolution can be increased by approximately 20%. This novel SIL-based near-field optics will be verified through experiments such as measuring focused beam spot profiles and observing the topology of a measurement sample. The studied SIL-based near-field optics can be applicable to not only next generation optical storage device but also high resolution microscopy and pattering technologies.