• Journal of Broadcast Engineering
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• v.7 no.3
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• pp.271-276
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• 2002

It is very important to find errors in broadcasted streams because it can help us to find where errors occur. Broadcasted streams may have errors in the RF(radio frequency) or baseband domain. It is very important to fix these errors because it can help to stabilize set-top boxes, provide stable receiving, and give comfortable environments to watch TV. Since 2001, major terrestrial broadcasters in Korea started the DTV broadcasting in Kwan-Ak over Seoul area. In this paper, we provide some analysis on errors in MPEG-based TS streams, PSIP packets, and RF area which may occur in DTV systems and compare this result with that of USA.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• fall
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• pp.273-276
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• 2021

기존의 중계 시스템은 유선 기반으로 방송 중계차와 케이블 등이 필요하여 시간과 비용, 장소의 제약과 같은 여러 한계점을 가지고 있었다. 하지만 무선 중계 기술의 발전으로 무선 카메라만 있으면 긴급재난 현장이나 중계차가 들어갈 수 없는 지역에서도 중계가 가능하게 되면서 중계방송의 제한 범위가 좁아지고 있다. 따라서 본 논문에서는 시간과 장소의 제약 없이 방송을 송출할 수 있는 5G 무선 중계 시스템을 분석한다. 분석한 시스템은 5G 모뎀이 장착된 MNG 장비를 이용해 UHD와 4K 신호를 무선으로 처리하여 초저지연·초고화질로 송출한다. 또한 현존하는 멀티뷰 기술을 접목시켜 시청자들이 원하는 서비스를 제공한다.

• 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.

• Fire Science and Engineering
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• v.27 no.1
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• pp.14-19
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• 2013

In this paper, I have developed an automatic distress notification system (ADNS) working with an external VHF device in small ship. The proposed system is as part of a small ship disaster analysis system which can detect and quickly respond to the small ship disaster. The automatic notification system receives the location information signal from the disaster analysis system, and the signal will be converted into voice signal to broadcast of the accident position through external VHF device. It will be sending a distress message as form of voice information through VHF device until sinking under the water. Through this research, I expect we'll be make a quick response and prevent a terrible loss of human life.

• Journal of Broadcast Engineering
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• v.1 no.1
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• pp.1-6
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• 1996

Digital DBS service using Korea Sat starts at Korea Telecom's Yong-in transmission site. Total 6 transmitting stations are needed. At each transmitting station, 4 TV programs are compressed and multiplexed using MPEG-2, modulated into IF, RF signals, then finally transmitted through antenna. At DBS transponder, received signal is down converted, amplified and re-transmitted to earth. At receiver, signal is received by 45cm dish antenna, then wanted program is selected, demultiplexed and decoded. Transmission performance of BER lOE-ll is implemented by using FEe coding and QPSK modulation. For pay TV management, conditional access system, smart card and modem are used.

• Journal of the Korea Society for Simulation
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• v.25 no.2
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• pp.21-29
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• 2016

Indoor location system has been used Wi-Fi to get a location. After the development of BLE(Bluetooth Low Energy), the interest in the method of a indoor positioning had been move on. It has more advantages than using Wi-Fi. Easy installation, low power consumption, low signal interference and changeable setting(Advertising interval, tx power, etc.). These things can improve efficiency or accuracy in a indoor positioning system. For this reason, recent indoor positioning system uses BLE rather than Wi-Fi. Accordingly, error factors of BLE beacon based indoor positioning should be studying for high accuracy of indoor positioning. In this research, set up few experiment scenarios and keep a close watch on how technological, environmental factor is affecting positioning accuracy. When a application uses largest signal strength to get the indoor location, the mean error of experimental results was decreased compare to using received signal strength in real-time. The result was same when the application applied average and standard deviation to get the indoor location. Changing advertising interval had an effect on the mean error of indoor positioning. Short advertising interval makes the lower mean error than large advertising interval.

• Transactions of the Korean Society of Automotive Engineers
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• v.19 no.4
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• pp.91-98
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• 2011

Minimizing the cylinder wear and the consumption rate of cylinder oil in a large two-stroke diesel engine is of great economic importance. A motor-driven cylinder lubricator for Sulzer RT-flex large two-stroke diesel engines developed by authors is in need of mounting a quill system to lubricate cylinder parts for smoother operation. In order to apply the common-rail lubricating system to the developed cylinder lubricator as the second research stage, the quill system with a progressively quantitative distributor is improved in the electronically controlled quill system with an accumulating distributor. In this study, the effects of lubricator motor speed, plunger stroke and cylinder back pressure on oil feed rate, maximum discharge and delivery pressures are experimentally investigated by using the electronically controlled quill system with an accumulating distributor in the developed cylinder lubricator. It is found that the oil feed rate of the electronically controlled quill system with an accumulating distributor is larger than that of the quill system with a progressively quantitative distributor because of the increase of delivery speed and volume by changing the location of accumulator in the same experimental condition.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.06a
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• pp.117-120
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• 2007

It has able to be possible that expression and store visual image from analog to digital without picture quality damaged via improvement of video compression technology. And also, It is possible to broadcasting digital image via transmission of digital image on MPEG-2 standardization. for this reason, the broadcasting business owners have converted broadcasting service from analog to digital. But, local SO(System Operator) has a difficult point which secure HD(High Definition) broadcasting program. In this paper, we designed and implemented Scheduling System for MPEG-2 Digital broadcasting which gather HD broadcasting program from major broadcasting business owners(as like MBC, KBS, SBS, etc) and broadcast them.

• Journal of the Institute of Convergence Signal Processing
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• v.20 no.4
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• pp.232-237
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• 2019

It has recently been combined with advanced technologies such as AR and VR, and its application range is expanding to various forms of smart signage. However, until now, digital signage service that reaches us is installed in many floating populations such as bus stops, elevators, and banks and is used in the form of providing news, weather, and advertisements. In addition, large companies, government offices, and outdoor advertising companies occupy the market. The use of such services in small and medium-sized businesses and small retail stores is costly and expensive to manage. Also, it is difficult to generalize the market because services and solutions are being deployed in the market in the form of top-down. Therefore, in this paper, we proposed a digital signage system for transmitting a remote video advertisement that uses a show window in front of the store as a beam project screen for small retail stores, and can remotely set and manage and update it in OSGi service platform.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2008.11a
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• pp.27-30
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• 2008

본 논문에서는 지상파DTV 방송프로그램 보호를 위한 하드웨어 PPI 전송서버를 제안한다. 제안한 하드웨어 PPI 전송서버는 방송환경에서의 안정성을 보장하기 위하여 소프트웨어의 PPI 스케줄러와 하드웨어의 PPI MUX로 구성하였다. PPI 스케줄러는 EPG를 PPI 보호신호와 프로그램 ID와 함께 편성하여 시간순서로 스케줄링하는 기능을 제공하며, PPI MUX는 EPG, PPI 보호신호, 프로그램 ID를 PSIP로 부호화한 후, 이를 MPEG-2 TS로 패킷화하여 실시간 출력하는 기능을 제공한다. 또한 하드웨어 PPI 전송서버는 기존의 방송 송출 시스템의 변경 없이 유연하게 연동시킬 수 있는 장점이 있다. 본 논문에서 제안한 하드웨어 PPI 전송서버는 PPI 보호신호를 방송프로그램에 삽입하여 송출함으로써, 지상파DTV 방송프로그램의 무단복제, 불법배포를 제한하는 기능을 제공한다.