• Journal of the Korean Institute of Telematics and Electronics B
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• v.30B no.12
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• pp.31-39
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• 1993

In the playback signal processing of a digital magnetic recording system, the major signal processing processes consist of pulse equalization. pulse detection, clock recovery, and data recovery. Equalizer which compensates interference occurrde between pulses recorded in high density on a magnetic media is realized by pulse slimming method, and pulse detection by a integrating detector. Clock recovery from the detector output was accomplished by using PLL. and data recovery to reduce noise effects was carried out by utilizing the three sampling clocks recovered in clock recovery process. In this paper these processes are implemented in hardware and its performance is evaluated by experimenting with a commercial DAT. It was found that the playback signal processor proposed is suitable to the practical high density magnetic recording system.

• Journal of Astronomy and Space Sciences
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• v.27 no.2
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• pp.107-116
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• 2010

We developed the playback control software for a high-speed playback system which is a component of the Korea-Japan Joint VLBI Correlator (KJJVC). The Mark5B system, which is a recorder and playback system used in the Korean VLBI Network (KVN), has two kinds of operation mode. That is to say, the station unit (SU) mode, which is for the present Mark4 system, and the VSI mode, which is for the new VLBI standard interface (VSI) system. The software for SU is already developed and widely used in the Mark4 type VLBI system, but the software for VSI has only been developed for recording. The new VLBI system is designed with a VSI interface for compatibility between different systems. Therefore, the playback control software development of the VSI mode is needed for KVN. In this work, we developed the playback control software of the Mark5B VSI mode. The developed playback control software consists of an application part for data playing back, a data input/output part for the VSI board, a module for the StreamStor RAID board, and a user interface part, including an observation time control part. To verify the performance of developed playback control software, the playback and correlation experiments were performed using the real observation data in Mark5B system and KJJVC. To check the observation time control, the data playback experiment was performed between the Mark5B and Raw VLBI Data Buffer (RVDB) systems. Through the experimental results, we confirmed the performance of developed playback control software in the Mark5B VSI mode.

• The KIPS Transactions:PartA
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• v.10A no.2
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• pp.173-180
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• 2003

This paper proposes Remote Educating Communication Tool (RECT) that allows students and teachers to communicate using Web-based Bulletin Board System. The distance teaching using DCOM (Distributed Component Object Model) voice module is used to enhance academic accomplishments for students in computer class. The DCOM voice module to be used in distance learning is designed, implemented and applied to teachers and students in the computer class in order to measure and analyze academic results. The RECT server provides Q&A sessions between students and teachers in the BBS using recording and playback functions. The client RECT includes recording and playback functions. The client module of RECT receives and uses DCOM module. When recording, the client transmits voice files with the recorded content to the server.

• Proceedings of the Korean Institute of Communication Sciences Conference
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• 2004.11a
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• pp.250-250
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• 2004

• Journal of Korea Society of Digital Industry and Information Management
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• v.13 no.2
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• pp.13-25
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• 2017

Recently, the high performance of tactical situation display console and tactical data links are used to integrate the operational situations in accordance with information age and NCW (Network Centric Warfare). The tendency to maximize the efficiency of task execution has been developed by sharing information and the state of the battle quickly through complex and diverse information exchange. Tactical data link is a communication system that shares the platform with core components of weapons systems and battlefield situation between the command and control systems to perform a Network Centric Warfare and provides a wide range of tactical data required for decision-making and implementation.It provides the tactical information such as tactical information such as operational information, the identification of the peer, and the target location in real time or near real time in the battlefield situation, and it is operated for the exchange of mass tactical information between the intellectuals by providing common situation recognition and cooperation with joint operations. In this study, still image management, audio file management, tactical screen recording and playback using the storage and playback, NITF (National Imagery Transmission Format) message received from the displayer integrates the tactical situation in three dimensions according to multiple data link operation to suggest ways to ensure data integrity between the data link processor during the entire operation time.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.21 no.6
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• pp.1554-1566
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• 1996

In this paper, a new symbol timing algorithm for a magnetic recording system as HDD, is proposed. Above all, the Lorentzian channel model applied, the distortion and the attenuation problems of playback signals at high speed and storage density were considered. The structure and the operation of popular data detectors for HDD were understood, and the adopted symbol timing algorithm were profoundly analyzed. On the basis of these understanding and analysis, a new symbol timing algorithm for high density HDD was proposed, and the performance evaluation of this proposed algorithm was done.

• Journal of the Korean Institute of Telematics and Electronics
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• v.24 no.4
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• pp.618-624
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• 1987

This paper describes the design and fabrication of a signal processing integrated circuit required for the recording and playback of VTR audio signal. The integrated circuit was designed using 8\ulcorner design rule and its chip size is 2.5x2.5mm\ulcorner It was fabricated using SST bipolar standard process technology. The measurement analysis of the fabricated circuit proves the satisfactory DC characteristics and its proper audio signal processing funcstion.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.943-946
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• 2001

We have developed a PVR (Personal Video Recorder) chip that is capable of simultaneous playback and recording of HD quality MPEG-2 streams for digital TV. it provides viewers with some advanced features as well as pause, instant replay, skip forward and fast forward/rewind found in conventional PVRs for analog TV. This paper describes the enhanced and innovative features that art implemented on our PVR.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.963-966
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• 2003

As the broadcasting service is digitalized, the copyrighters more concern about permitting users to record broadcasting content. However, the recording is very convenient function for the users to enjoy their favorite program without restriction of broadcasting schedule. In this paper, we will suggest an efficient mechanism to protect recorded content. We will also propose a new business model on the recorded broadcasting content using suggested protection mechanism.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2013.10a
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• pp.125-127
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• 2013

해상교통관제시스템(Vessel Traffic System: VTS)에서는 해상 사건/사고를 사후 확인하거나 해상 교통량 확인을 위해 사용하기 위한 목적으로 VTS에서 발생하는 데이터를 저장 및 관리한다. 특정 지역에 대한 장시간 교통량 확인에서는 녹화된 재생 데이터를 고속 배속으로 실행시켜 살펴보는 것이 시간 단축에 큰 도움이 된다. 그런데 일반 영상이 아닌 VTS 서브 시스템간 주고 받은 메시지와 영상이 포함된 VTS 녹화재생에서는 고속 배속을 지원하는데 자연스럽지 않은 문제점이 발생하고 있다. 따라서 본 논문에서는 VTS 녹화재생 기능이 고속 배속을 지원하기 위해 필요한 요구사항을 분석한다.