• Journal of Information Processing Systems
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• 제14권5호
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• pp.1272-1285
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• 2018

The paper presents a novel embedded multifunctional media sever (EMMS) for mobile devices to receive various media programs. Being different from other contemporary system research, the paper mainly studies how to design a reception solution for terrestrial digital television (DTV) on mobile devices and how to enable mobile devices can receive DTV program, enjoy video-on-demand (VOD), achieve video surveillance and relay Internet video program via local Wi-Fi simultaneously. In the system design, we integrate broadcasting-terrestrial DTV tuner, streaming media re-transmission system, VOD disk, video camera and access interface to the Internet into EMMS, which can either receive terrestrial DTV radio signals and demodulate out digital transport stream (TS), or can read streaming media bit-stream from VOD disk, surveillance camera or access interface to the Internet. The experimental results show the proposed system is stable and quality-efficient. Comparing with the other systems, the proposed system has the least packet loss rate and response time.

• 방송공학회논문지
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• 제13권1호
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• pp.17-24
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• 2008

물리 계층과 응용 계층 사이의 상호 계층 최적화에 대한 많은 연구들이 진행되고 있다. 그 예로 H.264/AVC의 SVC (Scalable Video Coding)와 같이 다중 스트림 비디오 방식들이 제안되고 있다. 이러한 물리 계층과 응용 계층 사이의 상호 계층 최적화에 대한 노력들에 비해서 그 중간 계층인 세션 계층에서의 노력은 미비한 상태이다. 이에 대해서 본 논문은 다중 스트림 비디오 방식들을 지원하기 위한 IP Multimedia Subsystem 기반 하에서 세션 제어 방법을 제안하고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권10호
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• pp.2479-2496
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• 2013

Increasing demand for Full High-Definition (FHD) video and Ultra High-Definition (UHD) video services has led to active research on high speed video processing. Widespread deployment of multi-core systems has accelerated studies on high resolution video processing based on parallelization of multimedia software. Even if parallelization of a specific decoding step may improve decoding performance partially, such partial parallelization may not result in sufficient performance improvement. Particularly, entropy decoding has often been considered separately from other decoding steps since the entropy decoding step could not be parallelized easily. In this paper, we propose a parallelization technique called Integrated Multi-Threaded Parallelization (IMTP) which takes parallelization of the entropy decoding step, with other decoding steps, into consideration in an integrated fashion. We used the Simultaneous Multi-Threading (SMT) technique with appropriate thread scheduling techniques to achieve the best performance for the entire decoding step. The speedup of the proposed IMTP method is up to 3.35 times faster with respect to the entire decoding time over a conventional decoding technique for H.264/AVC videos.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2019년도 춘계학술대회
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• pp.556-557
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• 2019

현재의 영상감시 시스템은 3세대로서 영상장치는 저화질에서 고화질로 발전하였으며, 영상감시 솔루션은 단순형에서 지능형으로 발전함으로써 영상감시 성능이 향상되었다. 그러나 이러한 영상감시 시스템에 대한 장비 및 기술이 복잡해지고 다변화되면서 더 빠른 네트워크 속도, 안전한 전원공급 등 기반 인프라에 대한 의존성이 더욱 높아지고 있는 한편, 전력 및 통신과 같은 기본 인프라가 제한적인 지역에서의 영상 감시 지원에 대한 필요성이 증가하고 있다. 본 논문에서는 이렇듯이 기본 인프라가 제한적인 지역에서 지능형 영상감시를 지원할 수 있는 시스템을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제8권4호
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• pp.1481-1498
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• 2014

Automated activity monitoring has become important in many applications. In particular, automated monitoring is an important issue in large-scale management of group-housed livestock because it can save a significant part of farm workers' time or minimize the damage caused by livestock problems. In this paper, we propose an automated solution for measuring the daily-life activities of pigs by using video data in order to manage the group-housed pigs. Especially, we focus on the circadian rhythm of group-housed pigs under windowless and 24-hour light-on conditions. Also, we derive a cost-effective solution within the acceptable range of quality for the activity monitoring application. From the experimental results with the video monitoring data obtained from two pig farms, we believe our method based on circadian rhythm can be applied for detecting management problems of group-housed pigs in a cost-effective way.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권12호
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• pp.6034-6056
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• 2018

This paper describes two user studies in remote collaboration between two users with a video conferencing system where a remote user can draw annotations on the live video of the local user's workspace. In these two studies, the local user had the control of the view when sharing the first-person view, but our interfaces provided instant control of the shared view to the remote users. The first study investigates methods for assisting drawing annotations. The auto-freeze method, a novel solution for drawing annotations, is compared to a prior solution (manual freeze method) and a baseline (non-freeze) condition. Results show that both local and remote users preferred the auto-freeze method, which is easy to use and allows users to quickly draw annotations. The manual-freeze method supported precise drawing, but was less preferred because of the need for manual input. The second study explores visual notification for better local user awareness. We propose two designs: the red-box and both-freeze notifications, and compare these to the baseline, no notification condition. Users preferred the less obtrusive red-box notification that improved awareness of when annotations were made by remote users, and had a significantly lower level of interruption compared to the both-freeze condition.

• 한국산업융합학회 논문집
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• 제25권6_1호
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• pp.927-939
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• 2022

This study was conducted to develop a Web-GIS based monitoring module of smart city that can effectively respond, manage and improve situation in all stages of illegal dumping management on a city scale. First, five technologies were set for the core technical elements of the module configuration. Five core technical elements are as follows; video screening technology based on motion vector analysis, human behavior detection based on intelligent video analytics technology, mobile app for receiving civil complaints about illegal dumping, illegal dumping risk model and street cleanliness map, Web-GIS based situation monitoring technology. The development contents and results for each set of core technical elements were evaluated. Finally, a Web-GIS based 'illegal dumping monitoring module' was proposed. It is possible to collect and analyze city data at the local government level through operating the proposed module. Based on this, it is able to effectively detect illegal dumpers at relatively low cost and identify the tendency of illegal dumping by systematically managing habitual occurrence areas. In the future, it is expected to be developed in the form of an add-on module of the smart city integration platform operated by local governments to ensure interoperability and scalability.

• 한국정보통신학회:학술대회논문집
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• 한국정보통신학회 2013년도 춘계학술대회
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• pp.741-742
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• 2013

PONs (passive optical networks)은 운영 비용이 저렴하고 높은 대역폭을 제공하기 때문에 가입자 망에서 각광을 받고 있다. TDM (time-division multiplexing) PON은 단일 채널을 사용하기 때문에 UHD (ultra high-definition) IP TV, VOD (video on demand) 등과 같은 새로운 유형의 광대역 서비스에 대해서 충분한 대역폭을 제공하지 못하고 있다. WDM (wavelength-division multiplexing)와 TDM을 결합한 TWDM PON이 가입자망에서의 새로운 해답으로 여겨지고 있다. 본 논문에서는 TWDM PON에 대한 새로운 MAC (media access control) protocol을 제안한다.

• Journal of Communications and Networks
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• 제5권3호
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• pp.258-265
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• 2003

Transmission of continuous media streams has been a challenging problem of multimedia service. Lots of works have been done trying to figure out the best solution for this problem, and some works presented the optimal solution for transmitting the stored video using smoothing schemes applied to each individual stream. But those smoothing schemes considered only one stream, not the whole streams being serviced, to apply themselves, which could only achieve local optimum not the global optimum. Most of all, they did not exploit statistical multiplexing gain that can be obtained before smoothing. In this paper, we propose a new smoothing scheme that deals with not an individual stream but the whole streams being serviced simultaneously to achieve the optimal network bandwidth utilization and maximize the number of streams that can be serviced simultaneously. We formally proved that the proposed scheme not only provides deterministic QoS for each client but also maximizes number of clients that can be serviced simultaneously and hence achieves maximum utilization of transmission bandwidth.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2000년도 ITC-CSCC -1
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• pp.35-38
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• 2000

Low bit rate image/video coding is essential for many visual communication applications. When bit rates become low, most compression algorithms yield visually blocking artifacts that highly degrade the perceptual quality, and post-processing approaches provide one attractive solution. In this paper, we provide simple and very efficient blocking artifacts reduction method using constrained random value addition. Our method is simple enough to be used for real-time post-processing of video.