• Journal of Broadcast Engineering
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• v.6 no.3
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• pp.215-224
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• 2001

In recent days, research activities on multimedia services mainly focus on the multiplexing system with timing synchromization for media components, such as video, audio and text. The MPEG-4 standard emphasizes object-based coding which includes analysis and understanding of the Image content. Since in MPEG-4 we can define objects and encode them independently, we can manipulate and display each object for different applications. This feature of MPEG-4 is also vero useful for multimedia services, such as video streaming cia different network channels, digital versatile disc, internet TV, video E-mail, and so on. In this Paper, we implement a multimedia streaming system which is compliant with the MPEG-4 system and the MP4 file format.

• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.861-865
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• 2008

More budget is supplied to R&D in Korea, more SCI articles are published rapidly recent years. But we can't know this SCI journals included the articles by Korean are subscribed print or licensed e-journals. So This study aims at discovering the trends and phases of SCI journals and articles published by Korean using bibliographic analysis. The SCI(Science Citation Index) database DVD version was used to search for the number of times paired Korean articles from 2004 to 2006.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2005.10a
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• pp.698-701
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• 2005

We have investigated experimentally a nano patterning using electron beam lithography for the nickel stamper fabrication. Recently, DVD and Blu-ray disk(BD) have nano-scale patterns in order to increase the storage density. Specially, BD has 100nm-scale patterns which are generally fabricated by electron beam lithography. In this paper, we found optimum condition of electron-beam lithography for 100nm-scale patterning. We controlled various conditions of EHP(acceleration voltage), beam current, dose and aperture size in order to obtain optimum conditions. We used 100nm-thick PMMA layer on a silicon wafer as photoresist. We found that EHP was the most dominant factor in electron-beam lithography.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.26 no.4
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• pp.764-774
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• 2002

Dynamic behaviors are analyzed for an automatic ball balancer (ABB) with triple races, which is a device to reduce the unbalanced mass of optical disk drives (ODD) such as CD-ROM or DVD drives. The nonlinear equations of motion are derived by using Lagrange's equations with the polar coordinate system. It is shown that the polar coordinate system provides the complete stability analysis while the rectangular coordinate system used in other previous studies has limitations on the stability analysis. For the stability analysis, the equilibrium positions and the linearized perturbation equations are obtained by the perturbation method. Based on the linearized equations, the stability of the system is analyzed around the equilibrium positions; furthermore, to confirm the stability, the time responses for the nonlinear equations of motion are computed by using a time integration method and experimental analyses are performed. Theoretical and experimental results show a superiority of the ABB with triple races.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2001.11b
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• pp.817-825
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• 2001

The natural frequencies of a flexible spinning disk misaligned with the axis of rotation are studied in an analytic manner. The effects of misalignment on the natural frequency need to be investigated, because the misalignment between the axis of symmetry and the axis of rotation cannot be avoided in the removable disks such as CD-R, CD-RW or DVD disks. Assuming that the in-plane displacements are in steady state and the out-of-plane displacement is in dynamic state, the equations of motion are derived for the misaligned spinning disk. After the exact solutions are obtained for the steady-state in-plane displacements, they are plugged into the equation for the dynamic-state out-of-plane motion. The resultant equation is a linear equation for the out-of-plane displacement, which is discretized by the Galerkin method. Based on the discretized equations, the effects of the misalignment are analyzed on the vibration characteristics of the spinning disk, i.e., the natural frequencies and the critical speed

• Journal of KSNVE
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• v.9 no.2
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• pp.324-330
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• 1999

With the increase of track density, high rotational speed and the compatibility for various media such as CD-ROM, CD-R/RW, DVD-ROM/RAM/RW etc. in optical disk drive, the effective anti-vibration design is so crucial for robust operaton. Especailly when the drive is self-excited by unbalanced disk, internal sled base vibration and its external transmission to the case bring about so severe problem. Generally these two consideration points the practical anti-vibration design process to control thses two conflictive properties using finite element analysis. As an example of the design process, Duro 25 and 40 visco-elastic rubber mount was selected and analyzed. The stiffness obtained from FEM rubber model was well matched with the experiments. Also it was confirmed that the internal and external vibration induced from unbalanced disk have good agreement with experimental results. The proposed design process is adopted to the slim-type optical disk drive.

• Journal of the Korean Society of School Health
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• v.24 no.1
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• pp.1-11
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• 2011

Purpose: This study is a non-equivalent control group pre-post design, which attempted to observe the effects of Basic Life Support Education on undergraduate students' CPR Knowledge and Attitude. Methods: The subjects were 96 undergraduates in Jeonbuk. They were divided into two groups: an experimental group of 46 students and a control group of 50 students. The BLS education was given by three BLS instructors certified by the American Heart Association using a DVD. Data were collected from October 20 to November 15, 2010 and analyzed, using the ${\chi}^2$ test, t-test, and ANCOVA. Results: There were significant differences between the experimental group and the control group in the levels of CPR Knowledge and Attitude. The 1st hypothesis, that the CPR knowledge scores for the experimental group would be higher than those of the control group, was supported (F=157.58, p=.000). The 2nd hypothesis, that the CPR attitude scores for the experimental group would be higher than those of the control group, was supported (F=23.78, p=.000). Conclusion: This study showed that BLS education had a positive influence on undergraduate students' knowledge and attitudes toward CPR. We expect that BLS education will contribute to spreading knowledge of CPR and reducing mortality among heart attack victims, and we can see from this study how CPR training in combination with theory and clinical practice develops knowledge and practical ability.

• Journal of Distribution Science
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• v.20 no.1
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• pp.109-114
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• 2022

Purpose: The purpose of this study is to confirm that multichannel distribution strategies may be used for cultural and artistic products such as musicals, just as for general consumer goods, through a case study on the distribution strategy for a musical title. In addition, a distribution strategy for cultural and artistic products is proposed based on the analysis of the case. Research design, data, and methodology: Qualitative research methods, such as case study research and in-depth interviews, were used in this study. Results: The case study of the Korean musical Myeongdong Romance confirmed that multichannel distribution strategies may be used for musicals, including performances at theaters, Naver TV screenings (a service linked to an Internet portal), LGU+ screenings (an IPTV and OTT media service), DVD releases, and screenings of recordings of Romance Hall performances. Conclusion: For cultural and artistic products such as musicals, distribution channels can be diversified to incorporate the simultaneous use of multiple channels. New cases involving other cultural and artistic products and services to which this distribution strategy is applicable may be identified, and the strategy may be implemented along with new technologies to reduce costs further.

• Proceedings of the Korea Information Processing Society Conference
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• 2008.11a
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• pp.1500-1503
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• 2008

H.264와 같은 고압축 비디오처리 기법의 등장으로 기존의 MPEG2와 같은 비디오 압축에서 H.264로의 비디오 트랜스코딩이 증가되고 있지만, 고압축 비디오 콘텐츠의 온라인과 오프라인에서 불법배포는 현재 문제가 되고 있다. 본 논문에서는 다이렉트쇼 환경 기반에서 고압축과 저작권 보호를 위한 비디오 트랜스 코딩과 워터마킹을 구현한다. 제안한 방법은 다이렉트쇼의 필터를 이용하여 MPG,WMV를 H.264로 비디오 트랜스코딩을 하고 이와 함께 비디오의 공간영역 특성을 이용하여 저작권 보호를 위한 강인한 워터마킹을 구현한다. 실험 결과 MPG,WMV를 H.264로 트랜스코딩에서 H.264의 QP(Quantization parameter)를 15로 하고 화면간 반복을 10프레임으로 하였을 경우 저작권 보호를 위하여 삽입된 워터마크는 평균 99% 검출됨을 확인하였고, 또한 트랜스코딩중 워터마크삽입에 따른 시간지연은 전체 트랜스코딩시간의 5.7%가 됨을 확인할 수 있었다. 제안한 방법은 저작권 삽입 기능가지는 트랜스코딩 소프트웨어를 필요로 하는 Digital TV방송, IPTV, DVD 사업에 사용 될 수 있을 것이다.

• Journal of the Korean Society of Costume
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• v.55 no.7 s.98
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• pp.62-75
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• 2005

This study is focused on main performers' stage costumes in the 'Swan Lake', a masterpiece of classical ballet, which Is newly represented by Matthew Bourne, a choreographer. The objectives of the study is to help understand a trend of costume in modern public performance and art. First, this paper is attempted to describe the concept and the elements of ballet costume, secondly, to consider the performance generally, and finally to analyze main performers stage costumes. This study was performed by two processes; The first was to visit theaters to view the performances in person: the classical ballet by the Bolshoi Theater Ballet, the performance by Korea national ballet academy and the Matthew Bonne's modernly redefined ballet. The second was to review the regarding literatures and DVD. There are two apparent characteristics of main performers' stage costumes in modern-style ballet compared with classic-style ballet. First, there is an approach to gender identity; the character of swan with the classic tutu that has been the culmination of femininity in the classic-style ballet, used to be represented in an established idea on ballet costume, is now substituted by a creative idea, male ballerina and trouser-style ballet costume. Second, there is an approach to breaking the convention on the purpose of emphasizing popularity arousing real sympathy and art value. Also, modern-style ballet introduces bare body and ffot rather than tutu and toe-shoes, and adapts items from casual outfit fitted in earh performer's character with a present-day life.