• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.314-317
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• 2012

최근 차량의 멀티미디어 장치들이 증가하면서 이 장치들을 광 네트워크로 연결하여 멀티미디어 데이터를 송 수신해서 사용할 수 있는 MOST(Media Oriented Systems Transport) 네트워크를 적용한 차량들이 늘어나고 있다. MOST 네트워크는 최근 자동차 멀티미디어 시스템에 넓게 사용되고 있는 통신 시스템으로서, 동기 및 비동기 데이터를 동시에 전송할 수 있고, 최근에는 150Mbps를 전송할 수 있는 MOST150 네트워크를 이용한 연구가 활발히 진행되고 있다. 본 논문에서는 MOST150 네트워크에서 Audio 데이터 입출력을 제어하기 위한 알고리즘을 설계 및 구현하였다. Audio 데이터를 제어하는 방식은 ADC(Analog to Digital Converter)를 통해 Audio 데이터가 들어오면 IOC(IO Companion)를 통해 INIC으로 Audio데이터를 전달한다. INIC은 MOST150 네트워크로 데이터를 전송하고 그렇게 보내진 Audio 데이터를 MOST150 네트워크 내부의 다른 장치에서 INIC을 통해 데이터를 수신하여 DAC(Digital to Analog Converter)를 통해 Audio 장치에서 소리가 나는 것을 테스트하여 정상적으로 동작함을 확인하였다.

• Journal of Communications and Networks
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• v.17 no.1
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• pp.67-74
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• 2015

In this paper, we propose a web-based content syndication system in which users can easily choose Internet protocol television (IPTV) contents. This system generates personalized content guide to provide a list of IPTV contents with respect to users' interests and statistics information of their online social community. For this, IPTV contents and relevant metadata are collected from various sources and transformed. Then, the service and content metadata are processed by user metadata including audience measurement and community metadata. The metadata flows are separated from content flows of transport network. The implementation of IPTV content syndication system demonstrates how to arrange IPTV contents efficiently from content providers to the end user's screen. We also show that the user metadata including online community information are important for the system's performance and the user's satisfaction.

• Journal of the Korean Society of Groundwater Environment
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• v.4 no.3
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• pp.111-115
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• 1997

Discrete fracture model has become one of the alternatives for the classical continuum model to simulate the irregular aspects of the fluid flow and the solute transport in fractured rocks. It is based on the assumptions that the discharge in a single fracture is proportional to the cube of the aperture and the fractured rock can be represented by the statistical assemblage of such single fractures. This study is intended to evaluate the effect of the fracture junction on the cubic law. Numerical solution of flow in junction system was obtained by using the Boundary-Fitted Coordinate System (BFCS) method. Results with different intersection angles in crossing fractures show that the geometry of the junction affects the discharge pattern under the same simulation conditions. Therefore, strict numerical and experimental examinations on this subject are required.

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.39 no.6
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• pp.612-622
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• 2002

In this paper, we review temporal error concealment for video transport over unreliable networks, and a new approach for the recovery of lost or erroneous motion vection(MV)s by classifying the movements of neighboring blocks by their homogeneity is proposed. MVs of the neighboring blocks are classified according to the direction of MVs and a representative value for each class is determined to obtain the candidate MV set. By computing the distortion of the candidates, a MV with the minimum distortion is selected. Experimental results show that the proposed algorithm exhibits better performance in many cases than existing methods.

• Journal of the Korean Electrochemical Society
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• v.8 no.4
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• pp.177-180
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• 2005

A series of inorganic-organic hybrid membranes were prepared with a systematic variation of titanium dioxide nano particles content. Their liquid uptake, methanol permeability and proton conductivity as a function of inorganic oxide content were investigated. The results obtained show that the inorganic oxide network decreases the proton conductivity and liquid uptake. It is also found that increase in inorganic oxide content leads to decrease of methanol permeability. In terms of the morphology, membranes are homogeneous and exhibit a good adhesion between inorganic domains and the polymer matrix. The properties of the composite membranes are compared with the standard nafion membrane.

• Journal of Environmental Impact Assessment
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• v.10 no.1
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• pp.73-83
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• 2001

Web based integrated sewer management system was developed for the analysis of sewer flow and for the optimal operation of sewer works using ArcView and SWMM. SWMM and ArcView were dynamically linked together using Avenue in order to construct user-friendly information management system. The developed system was applied to the residential area in Choonchun city to verify its utilities. All the relevant field data were analyzed on the basis of the developed system, and the modeling of sewer flow was implemented using RUNOFF, EXTRAN, TRANSPORT in SWMM. This system is now in the process of connection to the management system of stormwater, surface and subsurface environment in order to develop an integrated environmental management system. Futhermore, this system will be a critical part of overall control system of sewer works including sewer network and wastewater treatment plant. As this system can provide comprehensive prediction of flow and pollution profiles, it could serve as a tool not only for the optimal management, but also for the decision support system to examine the efficiency of planning and implementation of sewer projects.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2014.06a
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• pp.126-128
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• 2014

디지털 방송기술의 비약적인 발전으로 기존 HD(High Definition) 화질의 4~16배까지 지원 가능한 UHD(Ultra High Definition) 방송 서비스가 제공되는 새로운 시대를 맞이하게 되었다. UHD 방송은 초고선명 비디오와 22.2 채널 오디오 서비스가 가능한 차세대 실감방송 기술이다. 이러한 UHD 서비스를 제공하기 위해서는 고압축 영상 코덱 기술인 HEVC(High Efficiency Video Coding), OFDM(Othogonal Frequency Division Multiplexing) 기반 대용량 전송기술과 다양한 멀티미디어 부가서비스 가능한 전송 프로토콜이 필수적으로 요구된다. 최근 UHD 방송 전송 프로토콜로 표준화 추진 중인 MMT(MPEG Media Transport)는 이기종망에서 적용할 수 있으며, 양방향 전환이 가능하여 시청자의 요구사항을 실시간으로 반영할 수 있다는 장점을 지닌다. 한편, 지상파 UHD 방송 서비스를 빠르고 효과적으로 수신하기 위해 필요한 정보인 NIT(Network Information Table), RRT(Rating Region Table) 및 SDT(Service Description Table)가 MMT 시그널링 프로토콜에서는 포함되어 있지 않다. 따라서 본 논문에서는 지상파 UHD 방송 서비스의 효과적 수신이 가능한 MMT 기반 지상파 UHD 방송을 위해 NIT, RRT 및 SDT 정보가 포함된 서비스 시그널링 구조을 제안한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.2179-2183
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• 2009

As urbanization is progressed, the network for distributing water in a basin become complex due to the spatial expansion and parameter uncertainties of water supply systems. When a long range water supply plan is determined, the total construction and operation cost has to be evaluated with the system components and parameter uncertainties as many as possible. In this paper, the robust optimization approach of Bertsimas and Sim is applied in a hypothetical system to find a solution which remains feasible under the possible parameter uncertainties having the correlation effect between the uncertain coefficients. The system components to supply, treatment, and transport water are included in the developed water supply system and construction and expansion of the system is allowed for a long-range period. In this approach, the tradeoff between system robustness and total cost of the system is evaluated in terms of the degree of conservatism which can be converted to the probability of constraint violation. As a result, the degree of conservatism increases, the total cost is increased due to the installation of large capacity of treatment and transportation systems. The applied robust optimization technique can be used to determine a long-range water supply plan with the consideration of system failure.

• Journal of the Korean Professional Engineers Association
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• v.34 no.1
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• pp.14-22
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• 2001

Kimpo International Airport, located within the Seoul metropolitan district, experienced a sudden surge of passengers and cargo in recent years. In 1990, MOCT sponsored feasibility studios and Youngjong Island location was selected as the most suitable choice among four proposed sites to build a new airport. The construction work was then commenced in November 1992. Phase I project facilities are scheduled to start its operation in March 2001 with an annual capacity of 27 million passengers and 1.7 million tons of cargo for both enplaning and deplaning from International liners. Kimpo International Airport will remain in operation primarily for domestic passengers and cargo only. Phase II project construction work will add two more runways with its related facilities by 2005. Inchon International Airport will then conveniently serve 100 million passengers for enplaning and deplaning, and 7 million tons of inbound and outbound cargo annually in its full capacity. All the airport facilities In phase I and phase II periods are constructed to meet international standards. A fully integrated transportation network and logistics function systems should be accomplished prior to the full operation of the airport. With these sccomplishments, the state-of-the-art airport is poised to meet the needs of a rapidly growing worldwide air transport industry, and will more than adequately fulfill its role as a hub airport for the Northeast Asia region.

• The Journal of the Korea institute of electronic communication sciences
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• v.7 no.5
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• pp.983-989
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• 2012

IEEE 802.3az LPI mechanism allows an Ethernet link to reduce power consumption by entering a low-power sleeping mode and letting some components being powered off when there is no data to be transmitted through the link. However, if small amount of packets are being sent periodically, such a mechanism can not obtain energy efficiency due to a high overhead caused by excessive mode transitions. In this paper, we propose an enhanced LPI mechanism which can perform state transition adaptively based on the traffic characteristics on transport layer and network status. This simulation result shows that proposed mechanism improves energy efficiency than LPI mechanism with respect to energy consumption rate for various traffic loads.