• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2016.06a
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• pp.258-259
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• 2016

일반적으로 UHD 방송 편집 시스템에서 UHD 영상의 데이터양이 막대하기 때문에 실시간 전송을 위해 코덱과 함께 압축하여 편집 서버로 혹은 편집 서버로부터 스트림 형태로 전송한다. BT.1120 형태로 전송 송출된 SDI (Serial Digital Interface) 내장 음향 데이터는 영상과 달리 보조 데이터 영역에 다른 메타 데이터들과 함께 합성되어 전송 송출되기 때문에 추출 및 합성이 상대적으로 어렵다. 특히 재생을 위해서는 영상 코덱으로부터의 출력 영상과의 동기를 고려해야 하고 음향 데이터를 BT.1120 표준에 맞춰 보조 데이터 영역에 합성해야하기 때문에 개발에 어려움이 있다. 이에 본 논문은 UHD 영상/음향 데이터의 실시간 획득/재생 시스템에서의 SDI 내장 음향 데이터의 추출 및 합성을 위한 FPGA (Field Programmable Gate Array) 기반 하드웨어 플랫폼을 제안하였다. 또한, 이를 위한 음향 데이터 추출 로직과 합성 로직을 HDL(Hardware Design Language) 설계하여 FPGA 내에 탑재하고 카메라/디스플레이/편집 서버와 통합하였다. 시험 결과 4K 60fps 데이터에서 정상적으로 영상과 음향을 분리/획득 및 합성/재생하였다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.5
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• pp.1241-1248
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• 1998

The multicast scheme can improve the efficiency of multimedia retrieval service system, assuming that video transmission speed is faster than the playback rate and the store-and-play scheme. To best exploit the multicast benefits under bandwidth heterogeneous environment, we develop a multicast scheduling algorithm called MTS(Maximum Throughput Scheduling) which tries to maximize the amount of information transferred at each scheduling with subgrouping method. The MTS method compromises the multiple unicast method and the multicast method with lowest transmission rate. we compare the performance of MTS with that of MMS(Most Multicasting Scheduling) and EDS(Earliest Deadine Scheduling) via computer simulation. The performance results show that the MTS requires less number of service handlers to service the same number of subscribers.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06b
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• pp.171-174
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• 2011

최근 안드로이드 소프트웨어의 숫자가 날로 증가하고 있는 동시에 사용자들의 요구 수준도 함께 높아지고 있다. 이에 따라 소프트웨어의 품질을 높이기 위한 테스트 과정의 중요성이 두드러지고 있으며 안드로이드 소프트웨어는 GUI를 기반으로 하고 있기 때문에 현존하는 GUI테스트 기법들을 이에 적용시키는 다양한 연구가 진행되고 있다. GUI 테스트 기법 중 Record-Playback 기법은 사용자의 사용 흐름을 기록 후 재현하는 방식으로 테스트를 반 자동화함으로 테스트 과정에 소모되는 시간과 자원을 감소시키기 때문에 많은 분야에서 활용되고 있다. 하지만, 이 기법은 테스트 케이스 생성 시 테스터의 비효율적인 노동을 증가시키는 문제점이 발생하고 있으며, 또한 안드로이드 환경에 적용시키기 위해서 그 특성에 대한 고려가 필요하다. 이에 본 논문에서는 안드로이드 환경에 적합한 RPB 기반 테스트 케이스 생성 및 활용 방안에 대해 제안한다. 이는 소프트웨어 테스트에 소요되는 시간과 자원을 감소시켜 소프트웨어의 품질 향상에 도움이 된다.

• 한국정보통신설비학회:학술대회논문집
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• 2007.08a
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• pp.142-146
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• 2007

Digital Rights Management (DRM) technology has been widely used for protecting the digital contents over the recent years. But the digital contents protected by DRM are vulnerable to various video memory capture programs when DRM packaged contents are decrypted on the consumers' multimedia devices. To make up for this kind of DRM security holes the Forensic Marking (FM) technology is being deployed into the content protection area. Most leading DRM companies as well as big electronics companies like Thomson and Philips already have commercial FM solutions. Forensic Marking technology uses the digital watermarking to insert the user information such as user id, content playing time and etc. into the decrypted and decoded content at the playback time on the consumer devices. When the content containing watermarked user information (Forensic Mark) is illegally captured and distributed over the Internet, the FM detection system takes out the inserted FM from the illegal contents and informs contents service providers of the illegal hacker's information. In this paper the requirements and test conditions are discussed for the commercial Forensic Marking systems.

• Proceedings of the IEEK Conference
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• 2002.07b
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• pp.1296-1299
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• 2002

We implemented a CD signal processor operated on a CAV 48-speed CD-ROM drive into a VLSI. The CD signal processor is a mixed mode monolithic IC including servo-processor, data recovery, data-processor, and I-bit DAC. For servo signal processing, we included a DSP core, while, for CAV mode playback, we adopted a PLL with a wide recovery range. Data processor (DP) was designed to meet the yellow book specification.［2］So, the DP block consists of EFM demodulator, C1/C2 ECC block, audio processor and a block transferring data to an ATAPI chip. A modified Euclid's algorithm was used as a key equation solver for the ECC block To achieve the high-speed decoding, the RS decoder is operated by a pipelined method. Audio playability is increased by playing a CD-DA disc at the speed of 12X or 16X. For this, subcode sync and data are processed in the same way as main data processing. The overall performance of IC is verified by measuring a transfer rate from the innermost area of disc to the outermost area. At 48-speed, the operating frequency is 210 ㎒, and this chip is fabricated by 0.35 um STD90 cell library of Samsung Electronics.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.6
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• pp.1496-1502
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• 1998

In this paper, a real-time audio broadcasting service system which is robust to loaded traffic on the Internet is developed. For implementing reliable real-time data transfer, the transfer characteristics of TCP/IP and UDP/IP was compared and analyzed. For lost packet recovery, redundant audio data algorithm was used and interleaving technique was applied for scattering consecutive packet loss. Test results showed, when using TCP/IP, pause occurred during playback, and when using UDP/IP, a stable receive rate was noticeable but the quality of the sound was lower than that of uisng TCP/IP. The recovery rate using redundant audio data and interleaving technique is shown in Fig. 9 and the delay is shown in Fig 4.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.619-621
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• 2013

This paper is proposing a real-time audio processing system for TCP/IP with server-client. The server sends the audio data packet which is the same size each time while playing the audio data. And the client plays the received audio data from the server. In general, The receiving speed of audio data packet is faster than processing the audio data. So, the unstable playback is occurred when playing the received audio data at the moment. In order to overcome this problem, the double buffering method is proposed.

• Journal of the Korean Society for Aviation and Aeronautics
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• v.23 no.3
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• pp.28-34
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• 2015

An analysis method of trajectory prediction has been suggested and the developed trajectory prediction module, which is an important functional component of the Arrival Manager (AMAN) of Jeju airport, has been tested by applying the suggested method. The objective of this method is to improve prediction performance of the trajectory prediction module. The trajectory prediction module predicts the trajectories based on the real-time track data and flight plans. Therefore, the suggested analysis method includes the simulation framework which is based on real-time playback, recording, and graphic display systems for testing. Besides, the definition of time error, which is a important index for the time based scheduling system, such as AMAN, is included in the suggested analysis method. An example of arrival time prediction accuracy improvement through the suggested analysis method has also been presented.

• Proceedings of the Korea Information Processing Society Conference
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• 2004.11a
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• pp.233-236
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• 2004

일반적으로 디지털 카메라나 캠코더, PC와 같은 제품에서 만들어진 이미지나 오디오 파일들은 다른 멀티 미디어 제품에서 재생하기 위하여 각종 휴대용 메모리카드에 저장된다. 본 논문에서는 이런 메모리 카드에 저장되어 있는 이미지나 오디오를 다양한 기능과 고 화질,고 음질을 제공하는 디지털 TV에 적용할 수 있는 시스템을 제안하고 있다. 제안한 시스템은 크게 JPEG 모드와 MP3 모드로 나누어지는데, JPEG 모드에서는 이미지 회전, 확대 및 화면 이동 등의 기능과 다양한 슬라이드 쇼를 제공하고 MP3 모드에서는 선택 재생, 전체 재생, 반복 재생 등의 기능을 제공함으로써 사용자들이 일반 가정에서 디지털 TV의 다양한 멀티미디어 기능을 즐길 수 있도록 하였다. 또한 사용자들에게 편리한 User Interface(UI)를 제공함으로써 PC 에 익숙하지 않은 사용자들도 쉽게 이용할 수 있을 것으로 기대된다.

• Journal of the Korea Society of Computer and Information
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• v.29 no.5
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• pp.177-187
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• 2024

177-Existing music recommendation systems do not sufficiently consider the discrepancy between the intended emotions conveyed by song lyrics and the actual emotions felt by users. In this study, we generate topic vectors for lyrics and user comments using the LDA model, and construct a user preference model by combining user behavior trajectories reflecting time decay effects and playback frequency, along with statistical characteristics. Empirical analysis shows that our proposed model recommends music with higher accuracy compared to existing models that rely solely on lyrics. This research presents a novel methodology for improving personalized music recommendation systems by integrating emotion recognition and user behavior analysis.