• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.17 no.6
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• pp.127-129
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• 2003

Recently. the efforts for the development of DVD concentrate on the high storage and multi-media. DVD has been manufactured by assembling many parts and it causes the vibration and noise. In this paper, one body rotor is proposed, which can make the nose and vibration be decreased. The injection mould for DVD rotor is designed by finite element analysis and the rotor is manufactured in the mould. The magnetic flux density is measured on the surface and it is compared with the design criteria.

• The Journal of the Korea Contents Association
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• v.5 no.5
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• pp.145-151
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• 2005

We can define the procedure of Authoring that it makes area cord and the reproduction prevent menu programmed into MPEG II video stream , Audio which is AC-3 audio stream and subtitle under its own category. And it makes process an attribute, an order and an operation, gives the last disk image, Which is DVD(digital versatile disc). There are various process of Authoring tools in the market so that authoring tools can enable, encourage, and assist users ('authors') in the selection of tools that produce simple title, video production and editing suites. In this paper, we will compare and analyze authoring process in which image and sound are authorized into DVD with IEEE 1394port between Window system using generally with Desktop PC and the Macintosh that is based on OSX.

• Proceedings of the Korea Contents Association Conference
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• 2004.05a
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• pp.365-371
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• 2004

디지털 기술의 급속한 발전으로 디지털 방송에 대한 여러 가지 요소기술과DTV가 곧 상용화 될 전망이다. 본 연구는 대용량 DVD 저장매체를 이용하여 3D 1-n급 방송 스트림을 송출하기 위한 시스템 설계에 관한 것이다. HD급 방송 스트림을 위한 HDD 및 여러 가지 저장매체를 통해 영상 데이터를 억세스를 하지만 데이터 보관방법상의 문제점과 디스크의 원리상 데이터 억세스를 균일하게 처리하지 못하여 발생하는 인터페이스 동기 불일치 등의 문제점이 있다. 그러므로 DVD 매체를 통한 저장방법 및 억세스의 균일함을 제공하고, 송출 출력을 2.4Mpds 인터페이스 고정시켜 응용 프로그램에서 미디어 정보를 MMIO DMA방식으로 버퍼링하므로써 스트림을 재생할 때 동기 등의 문제점을 해결하였으며, 또한 PCI 컨트롤러는 FPGA VHDR coding하여 PC의 3D-Streamer 응용 프로그램의 명령 신호로 제어를 한다. 이 명령에 따라 3D-Streamer는 3차원 입체영상적인 영상출력을 SMTPE-310M으로 출력하거나 8 DVB 모드로 출력을 하게 된다. 따라서 DVD 전송 직병렬 인터페이스로서 다른 셋톱 장치 및 스트림 전송 장치와 데이터 호환을 이루게 된다.

• Proceedings of the KSME Conference
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• 2001.06d
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• pp.585-588
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• 2001

Particle contamination on the data storage disks has been a serious problem for magnetic hard disk drive manufacturers. For high storage optical disks, such as DVD-ROM/RAM or NFR (near field recording) system, particle-induced damages can be also detected because only a few micrometer particles can prevent read/write signal from optical lens. The increasing areal density and smaller bit size accelerates particle induced damages on the optical disk. One of the methods to prevent particle contamination on the optical disk surface is to handle the disk enclosed in a cartridge like a modern DVD-RAM disk. However, even for a perfectly sealed disk drive, particles are found inside the drive. The other method is to improve disk surface characteristics. Particle contamination on the surface can be reduced by proper selection of disk coating materials. [n this paper, particle detachment ratios for CD (compact disk), DVD (digital versatile disk), HD (magnetic hard disk), HD with Jut lubricant, and aluminosilicate substrate HD were investigated. Surface roughness and surface energy of the test disks were compared with the particle detachment ratios. Proper substrate and lubricant characteristics to reduce particle contamination on the disk surface were found.

• Proceedings of the Korea Contents Association Conference
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• 2005.05a
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• pp.165-171
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• 2005

we can define the procedure of Authoring that it makes area cord and the reproduction prevent menu programmed into MPEG II video stream , Audio which is AC-3 audio stream and subtitle under its own category. And it makes process an attribute, an order and an operation, gives the last disk image (DVD). There are various types of Authoring tools in the market so that authoring tools can enable, encourage, and assist users ('authors') in the selection of tools that produce simple title and video production and editing suites. In this paper, we will compare and analyze authoring process in which image and sound are captured into DVD creation with IEEE 1394port with regard to Window system using generally with Desktop PC and the Macintosh of the PC on the system of Windows and OSX.

• Proceedings of the Optical Society of Korea Conference
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• 2000.02a
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• pp.300-301
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• 2000

DVD는 CD사이즈의 광디스크에 고화질기 MPEG2 디지털 압축동화를 두 시간이상 수록할 수 있는 기록 및 재생기기로써 최초의 규격서가 1996년 8월에 발행되었다. 650nm의 적색반도체레이저와 개구수 0.6의 대물렌즈를 채용한 광픽업으로 직경 12cm의 단면디스크에 CD-ROM의 약 7배인 4.7GB에서 17GB까지의 용량저장이 가능하다. 변조방식은, DC성분을 억제할 수 있고, 또한 DR(Density Ratio)이 큰 EFM-Plus 변조를 채용하고, 에러정정방식은 32kB를 하나의 블록으로 하는 Reed Solomon Product code이다. File system은, 음성, 화상데이터와 컴퓨터 데이터를 통합할 수 있도록 계층구조로 하고, ISO9669 파일시스템과 UDF파일시스템을 함께 사용하고 있다. (중략)

• Proceedings of the KSME Conference
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• 2000.11a
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• pp.159-164
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• 2000

In this study, the deformation analysis of 80mm optical disk holder considering the creep characteristics of plastic materials has been conducted and experimentally verified. It is very important to remedy the unrecoverable creep deformation and relaxation of holding force of an optical disk holder for the reliability of DVDR-P, DVD-ROM. A disk holder inserted in a cartridge case has been kept in the chamber with $60^{\circ}C$ temperature and 90% humidity for 24 hours. After storage test, the arm span and holding force of a disk holder have been measured after 24 hours at room temperature and normal humidity. The predicted results are in good agreement with experimentally measured one.

• Proceedings of the KSME Conference
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• 2001.06c
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• pp.432-437
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• 2001

It is necessary to improve mechanical and optical porperties in the optical disk substrates as the information storage devices with high storage density using blue laser are being developed. Injection compression molding is regarded as the most suitable process to manufacture optical disk substrates for quality recording and read-out. In the present research, the effects of processing conditions and the insulation layer thickness on gapwise birefringence and the land-groove pattern were investigated. It was found that the values of the birefringence distribution were very sensitive to mold temperature history, and the level of birefringence reduced and, furthermore, the quality of replication was improved due to the insulation layer.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.05a
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• pp.484-489
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• 2001

Recent trends in information storage devices disk are the transition from CD drives to high density DVD drives, the development of writable disk drives and the appearance of several high-density portable disk drives. In some flexible disk drives, self-excited disk vibrations become severe as rotation speed increases near or above critical speed. Critical speeds of CD/DVD, ASMO and floppy disks are experimentally measured and compared with analytical predictions. Flutter instability caused by aero-induced disk vibration at high speeds are experimentally observed. In ASMO, three nodal-diameter mode experiences its flutter at 8750 rpm with the frequency lock-on phenomenon. The CD/DVD disk does not have the aero-induce flutter up to 14,000 rpm.

• Journal of KSNVE
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• v.9 no.4
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• pp.693-702
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• 1999

We study the characteristics of airflow and sound noise induced by disk rotation in optical disk drives. The characteristics of airflow around a rotating disk surrounded by various tray structures are numerically investigated using a commercial CFD program and then compared with experimental results. Sound pressure and intensity caused by the fluid-structure interactions in the CD/DVD-ROM drive are measured, and the effect of the ariflow on the sound noise and disk vibration is discussed. In order to reduce airflow-induced noise and vibration around the rotating disk, tray geometry is modified. Both numerical and experimental studies implemented with different tray models show that the improved tray model alters the characteristics of the disk-induced airflow, causing the reduction of the airflow-induced sound level.