• 정보저장시스템학회논문집
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• 제3권1호
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• pp.13-16
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• 2007

The purpose of this paper is real time tilt servo control of the holographic data storage system. Holographic data storage device is a next generation data storage device with high storage density, high transfer rate and short access time. This device is very sensitive to a disturbance due to the enormous storage density. As to the recording material changed disc type, the media continuously vibrates as the disc rotates. When disc rotates, deviation, eccentricity and unbalance disturbance are occurred. This disturbances cause disc tilt, finally reference beam does not illuminates to correct incidence angle. Therefore real time tilt servo control is essential. In this paper, the algorithm is proposed to make real time tilt detection in angle multiplexing of the holographic data storage system with an additional servo beam and the experiments are performed.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.31-34
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• 2005

Mobile devices, such as PDAs, portable multimedia players, are more likely to encompass large storage devices with prevalance of high-quality multimedia contents. This paper proposes an object-based multimedia contents storage architecture that employs the object-based storage device model and the iSCSI protocol. It also provides a multimedia content player that operates directly with the proposed storage architecture. We implement both the proposed storage architecture and the multimedia content player upon the Linux environment. Performance evaluation by playing MP3 multimedia contents reveals that the proposed storage architecture reduces the total power consumption by 9%, compared with an existing networked storage. This enhancement is mainly contributed to the fact that a large portion of the file system is moved into the object-based multimedia contents storage from the mobile device.

• 한국통신학회논문지
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• 제29권4B호
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• pp.403-410
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• 2004

일반적으로 교환 시스템은 프로세서 보드, 입출력처리 보드 및 데이터 저장 장치등 그 기능별로 다수의 서브시스템들로 구성되어 있다. 또한 신뢰성을 확보하기 위하여 모든 서브 보드들은 이중화로 되어 있다. 교환시스템에서 저장 장치에는 시스템에 관련된 정보나 과금 정보등과 같은 작업 관련 데이터를 저장하며 비 휘발성 메모리에 저장해야 한다. 일반적으로 비 휘발성 저장장치를 구현할 때는 플래시메모리(flash memory) 또는 배터리 백업 메모리(battery backup memory)를 사용한다. 그러나 메모리는 단위 용량당 가격이 높고 백업(backup) 하지 않은 데이터를 손실했을 때 복구할 수 없다. 본 논문에서는 마이크로 컨트롤러를 이용하여 단위 용량당 가격이 저렴하고, 대용량의 데이터를 저장함과 동시에 이중화를 만족시키는 on-board 형태의 소형 디스크 모듈을 설계 구현하였다. 본 논문에서 구현된 이중화 저장장치는 사용 중인 엑티브(active) 디스크에 결함이 생겨 사용할 수 없을 경우에 리빌딩(rebuilding)과정을 동해 스탠바이 모듈로부터 데이터를 복구하며, 리빌딩 중에도 호스트 시스템은 스탠바이 디스크모듈을 이용하여 지속적으로 서비스를 제공할 수 있도록 설계되었다. 본 연구에서 개발된 저장장치는 교환시스템에서 플래시 메모리와 같은 값비싼 저장 장치를 대체 할 수 있을 것으로 기대된다.

• 한국자기학회:학술대회 개요집
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• 한국자기학회 2007년도 The 1st International Symposium on Advanced Magnetic Materials
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• pp.261.1-261.1
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• 2007

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2002년도 추계학술대회논문집
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• pp.582-587
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• 2002

Current information storage devices, such as HDD, CD/DVD-ROM/RW, probe-based memory and hologram memory, are compared with biological information storage mechanisms in DNA and brain memory. Newly developed approaches to overcome the limit of storage capacity are introduced in both magnetic and optical recording devices. Linear and areal density of information stored in the biological and mechanical storages are compared for the applications and developments of new storage devices.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 추계종합학술대회 논문집(1)
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• pp.263-266
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• 2000

In this paper we develop a dual storage device to store a lot of data safely and reliably in communication system. The device consists of micro-controller, FPGA and hard disk. It provides many functions those are rebuilding, automatic remapping, host service and remote host service. The developed device can be used instead of expensive storage device like flash memory in various communication systems.

• 정보저장시스템학회:학술대회논문집
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• 정보저장시스템학회 2005년도 추계학술대회 논문집
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• pp.47-52
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• 2005

A lot of information storage devices have been introduced and developed for recently years. The trends of those devices are high capacity, compact size, low power consumption, reliability, and removability for data interchange with other device. As a satisfaction of these trends, near-field technique is in the spotlight as the next generation device. In order for a near-field recording to be successfully implemented in the storage device, a slider and suspension is introduced as actuating mechanism. The optical slider is designed considering near-filed optics. Suspension is not only supports slider performance, and tracking servo capacity but also meets the optical characteristics such as tilt aberration, and guarantee to satisfy shock performances for the mobility fir the actuator. In this study, the optical slider and the suspension for near-field probe array are designed and analyzed considering dynamic performance of head-gimbal assembly and shock simulation..

• 한국정밀공학회지
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• 제18권4호
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• pp.25-36
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• 2001

• 정보저장시스템학회논문집
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• 제8권2호
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• pp.44-49
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• 2012

We measured the surface flatness of both sides for refractive media using the transmitted digital holography method. To enhance the accuracy of the result, phase-shifting system was used. With two different phase modulation of reference beam, the phase profile of object can be easily obtained. Thus, we proposed the surface measurement method which can measure large area fast, compared with conventional methods. To guarantee the reliability of obtained result, we compared with Zygo measurement system. With the proposed method, the surface flatness of $3.45{\mu}m$ resolution could be obtained.

• 정보저장시스템학회논문집
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• 제11권2호
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• pp.31-35
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• 2015

The Blu-ray Disc Recordable-Triple Layer (BD-R TL) media is considered as one of strong candidates for archival application among optical media formats, due to its large capacity. However, the long-term stability and degradation aspect have not been fully understood yet for BD-R TL media. Thus, the BD-R TL media were recorded at full tracks and analyzed by the random-symbol error rate (R-SER) measurement at different recording layers and recording positions after the accelerated aging test to understand its long-term stability. Finally, the general degradation aspect of BD-R TL media was discussed to improve the long-term stability.