• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.1
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• pp.223-235
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• 1993

VTR(Video Tape Recorder) has very complicated mechanisms composed of various cams, links, gears and so on. To satisfy kinematic requirements of VTR components, various geometric constraints between rigid bodies and a translational cam design program are developed. Mechanisms of VTR are divided into functional groups like a control part, a loading part and a tape guide part. Each group is modeled for kinematic and dynamic analysis. Finally, all groups are combined together for a complete VTR model and loads required for each function of VTR controls are studied. Detailed description of developed programs are presented and result are discussed.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1992.10a
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• pp.285-290
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• 1992

VTR(Video Tape Decoder) 데크(deck) 메카니즘의 조립과정중 최종공정인 주행계 조정공정은 비디오 테이프와 영상 헤드, 음성/콘트롤 헤드의 상대위치를 맞추는 공정으로 VTR의 화질을 좌우하게 된다. 본 연구에서는 주행계 조정나사들을 조정하는 나사조정장치와 이를 제어하여 VTR 데크 메카니즘의 주행계를 자동으로 조정하는 제어시스템을 설계, 제작하였다. 본 연구에서 개발된 VTR 데크메카니즘의 주행계 자동조정장치는 5개의 조정 나사를 모두 조정 가능하도록 구성되어 있기 때문에 시행착오로 인한 반복 조정 작업이 가능하게 되었다. 이것으로 공정의 합리화 및 자동화를 통한 공정의 무인화를 이루는 것이 본 연구의 목적이다.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 1990.10a
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• pp.181-185
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• 1990

In the present study, the following factors are analyzed systematically using the theoretical and experimental methods, which have the significant influence on the quality of VTR tape path system in order to develope the high performance and quality in VTR mechanism: 1) Vibration characteristics of the deck including the tape path sytem, 2) Modeling the global tape path, 3) Torsional vibration of the VTR drum. 4) Capstan system, 5) Tension bar, 6) Stick-slip phenomenon of the running tape.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 1995.06a
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• pp.113-116
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• 1995

4 : 2 : 2의 콤포넌트 포맷에 기초한 D-5 방송용 디지털 VTR 은 1/2 인치 테이프 상에 SDTV (Standard Definition TV) 신호를 압축없이 디지털 기록/재생하는 고화질 저장 장치이다. 본 논문에서는 1.2 Gbps 급 HDTV 신호를 D-5 VTR 에 효과적으로 기록/재생할 수 있는 방법에 대해 연구한다. 즉, HDTV 신호를 약 1/4 ∼ 1/5 정도 압축하고 압축된 데이터를 D-5 VTR의 입력 데이터율에 맞추어 기록한다. 이때 D-5 VTR의 배속 및 부가 기능을 충분히 활용할 수 있는 압축 방법이 되도록 한다.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 1986.10a
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• pp.91-94
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• 1986

In this paper, a servo motor control IC for VTR is developed using standard cell library. All the cells are designed by single metal and the 3um design rule. A desinged circuit consists of circuits which generates a switching pulse and a control reference signal in VTR. The operation of VTR chip is verified by COSMOS simulator. Finally, layout is drawn by YOSELA.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.11
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• pp.2655-2663
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• 1993

In order to evaluate the relative significance of tolerance management of various elements in a VHS VTR tape transport system, the effect of geometric variations of the elements from standard design values on the tape traveling path is studied. The tape is modeled as a string and each element in the tape transport system is modeled as a cylinder whose radius, position vector and orientation vector are specified. An numerical algorithm is proposed to find the coordinates of tape entry points and tape exit points for the elements from which the tape traveling path can be completely described. By using the suggested algorithm, an error sensitivity analysis of tape traveling path due to the geometric variations of tape transport elements is performed for a particular model in the market and the elements demanding relatively strict tolerance management are identified.

• Journal of Broadcast Engineering
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• v.1 no.2
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• pp.108-117
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• 1996

In this paper we propose a Wavelet- based compression algorithm of HDTV video signals for the purpose of recording HDTV signals in the digital VTR. Comparing to the DCT- based compression method, which only yields unrecognizable DCT coefficients, the low frequency components of Wavelet coefficients maintain recognizable spatial domain information. So, it is more suitable for various VTR operations such as editing and multi-speed mode operations. Also, the adopted Wavelet filter can be Implemented with simple shift operations, which can reduce the computational complexities substantially. The quality of reconstructed HDTV signals with a 4:1 compression ratio turns out to be good enough for the studio use.

• PNF and Movement
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• v.9 no.1
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• pp.11-19
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• 2011

The purpose of this study was to investigate whether it makes difference to use of the Augmented Feedback Type(Verbal Feedback, VTR Feedback and Verbal & VTR Feedback) to hemiplegic adults on learning of motor skill. For the purpose 15 hemiplegic adults who are received rehabilitation program at H hospital in Hong-Sung, Choong-Nam Province. Subjects were classified into three groups by random assignment; the Verbal Feedback group, the VTR Feedback group and Verbal & VTR Feedback group. Each groups received 5 subjects from hemiplegic adults. Subjects were tested by Timed Up and Go test for 9 weeks. And to find out the improvement measured by Pre-Test, Acquisition Test and Retention Test. To find out the improvement of each group's measures took average and standard deviation. To probate the significance of difference between the improvement conducted the one-way ANOVA and to probate the significance of difference of Acquisition Test and Retention test conducted paired t-test. The results of this study were as follows; First, All of Augmented Feedback Types had a positive effect on hemiplegic adults to learning of motor skill. Second, The Verbal Feedback group and the VTR Feedback group had no significantly difference at Acquisition Test, But They had the most improvement at Retention Test. Third, In hemiplegic adults, the Verbal & VTR Feedback group had the highest Retention Effect.

• Proceedings of the Korean Magnestics Society Conference
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• 1991.05a
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• pp.75-76
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• 1991

• Journal of Korean Electronics
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• v.13 no.6
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• pp.86-87
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• 1993