• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권5호
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• pp.1825-1839
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• 2015

The final draft of the latest video coding standard, High Efficiency Video Coding (HEVC), was approved in January 2013. The coding efficiency of HEVC surpasses its predecessor, H.264/MPEG-4 Advanced Video Coding (AVC), by using only half of the bitrate to encode the same sequence with similar quality. However, the complexity of HEVC is sharply increased compared to H.264/AVC. In this paper, a method is proposed to decrease the complexity of intra coding in HEVC. Early pruning and an early splitting strategy are applied to the quadtree structure of coding tree units (CTU) and residual quadtree (RQT). According to our experiment, when our method is applied to sequences from Class A to Class E, the coding time is decreased by 44% at the cost of a 1.08% Bjontegaard delta rate (BD-rate) increase on average.

• 융합신호처리학회 학술대회논문집
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• 한국신호처리시스템학회 2006년도 하계 학술대회 논문집
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• pp.45-48
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• 2006

This paper presents an approach to visual information based temporal indexing of video sequences. The objective of this work is the integration of an automatic face detection and a matching system for video indexing. The face detection is done using color information. The matching stage is based on the Principal Component Analysis (PCA) followed by the Minimax Probability Machine (MPM). Using PCA one feature vector is calculated for each face which is detected at the previous stage from the video sequence and MPM is applied to these feature vectors for matching with the training faces which are manually indexed after extracting from video sequences. The integration of the two stages gives good results. The rate of 86.3% correctly classified frames shows the efficiency of our system.

• Smart Structures and Systems
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• 제5권2호
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• pp.193-207
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• 2009

A framework for structural health monitoring (SHM) systems is presented utilizing a recent 3.5 generation mobile telecommunication technology, HSDPA (High Speed Downlink Packet Access). It may be effectively applied to monitoring bridges, cut-slopes, and other facilities located in rural areas where the conventional Internet service is not readily available, since HSDPA is currently commercialized in 86 countries to make the Internet access possible in anywhere the mobile phone service is available. The proposed SHM framework is also incorporating remote desktop software to have remote control/operation of the SHM systems. The feasibility of the proposed framework has been demonstrated by field tests on a highway bridge in operation. One can expect that fast advances in the mobile telecommunication technology will further enhance the performance of the SHM network using the proposed framework for bridges and other facilities located in remote areas without the conventional wired Internet service.

• Journal of the Optical Society of Korea
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• 제18권5호
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• pp.500-506
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• 2014

A new 3-D reconstruction algorithm for the human face is proposed using the derivative Moir$\acute{e}$ topography which ensures fast and robust reconstruction even for rough surfaces. The Moir$\acute{e}$ interference fringe pattern is initially obtained through the projection Moir$\acute{e}$ topography based on phase shifting, and then differentiated to provide a full unwrapped phase map for a human face. $2{\pi}$ ambiguity, which has been a chronically unsolved problem with Moir$\acute{e}$ topography, is successfully surmounted by differentiating the Moir$\acute{e}$ fringe patterns both in x- and y-directions when the object is located in the x-y plane. A real human face is used for verifying the proposed derivative Moir$\acute{e}$ topography. A human face of 4 different phase-shifted images taken in the fixed plane is almost fully reconstructed in 3-D format in 0.1 mm lateral resolution.

• ETRI Journal
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• 제27권6호
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• pp.777-787
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• 2005

In this paper, we propose an urgency- and efficiency-based wireless packet scheduling (UEPS) algorithm that is able to schedule real-time (RT) and non-real-time (NRT) traffics at the same time while supporting multiple users simultaneously at any given scheduling time instant. The UEPS algorithm is designed to support wireless downlink packet scheduling in an orthogonal frequency division multiple access (OFDMA) system, which is a strong candidate as a wireless access method for the next generation of wireless communications. The UEPS algorithm uses the time-utility function as a scheduling urgency factor and the relative status of the current channel to the average channel status as an efficiency indicator of radio resource usage. The design goal of the UEPS algorithm is to maximize throughput of NRT traffics while satisfying quality-of-service (QoS) requirements of RT traffics. The simulation study shows that the UEPS algorithm is able to give better throughput performance than existing wireless packet scheduling algorithms such as proportional fair (PF) and modified-largest weighted delay first (M-LWDF), while satisfying the QoS requirements of RT traffics such as average delay and packet loss rate under various traffic loads.

• Journal of electromagnetic engineering and science
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• 제14권4호
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• pp.321-328
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• 2014

Software defined radar (SDR) is a multi-purpose radar system where most of the hardware processing is performed by software. This paper introduces a concept and technology trends of software defined radar, and addresses the advantages and limitations of the current SDR radar systems. For the advanced SDR concept, the KAU SDR Model (KSM) is presented for the multimode and multiband radar system operating in S-, X-, and K-bands. This SDR consists of a replaceable multiband antenna and RF hardware, common digital processor module with multimode, and open software platform based on MATLAB and LabVIEW. The new concept of the SDR radar can be useful in various applications of the education, traffic monitoring and safety, security, and surveillance depending on the various radar environments.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2003년도 통신소사이어티 추계학술대회논문집
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• pp.353-356
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• 2003

As the wireless mobile telecommunication system has been developed with astonishment, its offering service has also widely been expanded including various data service. Currently, the wireless mobile telecommunication network presents voice service that covers for the most part of the whole service areas. For this reason, the availability of the switching capacity in the mobile switching center(MSC) is manipulated by the required volume of voice service. However, considering the increase of data service, it is desirable for the current switching method to be modified for more efficiency. In this Paper, we analyze the data traffic caused by providing data service in the wireless mobile telecommunication network. For this, we are firstly going to review the result of the analysis in the feature of the data traffic. Secondly, based on the review, we are also going to perform analyzing the other feature of the data traffic normally generated in the wireless mobile telecommunication network. We expect that this paper would be utilized as an elementary source for the feature of the SMS data .traffic and it will be an honour for ourselves to work on it.

• 한국정보전자통신기술학회논문지
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• 제5권4호
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• pp.186-190
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• 2012

남북한의 정보통신 단일화 및 표준화는 그 동안 다방면에서 다각도로 진행되어 왔다. 그러나 남북한 간의 정보통신 교류는 경제 산업측면이나, 학술적 측면이나, 제도적 측면 모두에서 답보상태다. 본 논문은 평화통일시대를 대비하고, 민족 간의 동질감 회복을 위하여 정보통신기술의 단일화가 필요하다는 전제하에 이를 위한 원칙과 추진체계를 제시한다. 단일화는 정보통신 전문가 중심으로 탈이념, 비정치적으로 진행되어야 하며, 이를 위하여 남북한 관계 전문가의 포럼활동이 활발해야 한다. 그리고 현재 사용하는 표준방식에 대한 논의보다는 미래기술에 대한 연구개발이 주가 되어야 한다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2002년도 춘계학술발표논문집 (상)
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• pp.653-656
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• 2002

본 연구는 데이터웨어하우징/의사결정시스템, 그리고 업무 처리 자동화 소류션등 새로운 애플리케이션 개발로 이하여 발생하는 엄청난 양의 데이터를 효율적으로 관리하기 위한 백업 서장 시스템을 SAN 환경을 지원하는 SANtopia 파일시스템에서 동작하도록 설계 구현하였다. 지금까지 데이터 저장시스템은 하나의 서버에 접속되어 있어서 네트워크 상의 다른 컴퓨터가 직접 활용하는 것을 허용하지 않기 때문에 기존의 네트웍을 기반으로 하는 파일서버 형태로는 이러한 대용량의 자료를 저장하고 관리하는데 한계가 있다. 이러한 문제를 해결할 수 있는 방법으로 Fibre Channel과 LAN 네트워크 모델을 결합하여 대역폭(Bandwidth)의 병목 현상을 크게 완화할 수 있는 SCSI 명령어를 이용하여 SANtopia 파일 시스템에서 파티션별 Full backup과 Restore 할 수 있는 시스템을 리눅스 기반에서 구현하였다.

• 한국정보처리학회:학술대회논문집
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• 한국정보처리학회 2000년도 추계학술발표논문집 (하)
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• pp.875-878
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• 2000

내용 기반 영상 검색은 일반적으로 질의 영상을 사용해서 검색한다. 대부분의 사용자는 검색 당시에 자신이 생각하는 질의와 일치하는 영상을 실제로 갖고 있지 않다. 사용자는 검색기가 제공하는 샘플이나 자신이 갖고 있는 영상 중에서 검색하고자 하는 개념과 비슷한 영상을 질의 영상으로 사용한다. 그러나, 이 질의 영상은 사용자가 생각하는 개념을 충분히 반영하지 못하는 경우가 대부분이다. 따라서 사용자는 자신이 원하는 결과를 얻기 위해서 검색을 여러 번 하게 된다. 이는 최초 검색에서 적절한 질의 영상을 사용하지 못하고 있기 때문이다. 검색 시스템의 검색엔진도 중요하지만, 적절한 질의의 사용 여부에 의해 검색 결과가 크게 좌우된다. 적절한 질의 사용의 중요성은 기존의 텍스트 기반 검색에서 이미 알려진 사실이다. 영상 검색에서도 효과 적인 검색을 위해서는 사용자가 생각하는 질의 영상을 구체화하여 질의로 사용하는 기술이 필요하다. 이러한 관점에서, 사용자가 검색하고자 하는 추상적인 개념을 구체화하여 질의 영상으로 사용한다면 검색 성능을 높일 수 있다. 본 논문에서는 사용자가 생각하고 있는 추상적인 질의를 구체화하기 위해 스케치 인터페이스를 개발하였다. 스케치 인터페이스를 통해서 사용자가 생각한 질의를 구체화하여 이를 검색에 활용함으로서 전체 검색 회수를 줄임으로서 보다 빠른 시간에 효과적으로 검색을 수행할 수 있었다.