• 제목/요약/키워드: Frame-efficiency

검색결과 866건 처리시간 0.026초

국내 웹 사이트 디자인의 행동적 사용성 측정 (Performance-measure of the domestic web site design)

  • 곽호완;곽지은;김수진
    • 대한인간공학회지
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    • 제18권3호
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    • pp.87-103
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    • 1999
  • The present study employed an experimental usability testing technique to explore cognitive engineering characteristics of WWW. Based on the results of our previous study which employed non-experimental methods such as questionnaire and heuristic evaluation method, this study used a behavioral performance-measurement technique to evaluate the usability of a domestic web-site design. Specifically, we revised the menu and document structure of the original 'Movie-Friend' site to solve the design problems which were extracted from the results of the heuristic evaluation method of our previous study. Exp. 1 compared the relative navigation efficiency of the original frame menu site and the revised pop-up toolbar site, and Exp. 2 compared the toolbar menu site and the revised frame site. As a result of Exp. 1, the revised pop-up toolbar site showed improved navigation efficiency compared to the original site, as indicated by the mean latency and the number of pathways to reach the target page. However, we found no performance difference between the frame site and toolbar site in Exp. 2.

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평면 프레임 구조물의 유한요소 비선형 해석을 위한 효율적인 수치해석 방법에 관한 연구 (A study on improving efficiency in computational procedure of finite element nonlinear analysis of plane frame structures)

  • 구정서;이병채;곽병만
    • 대한기계학회논문집
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    • 제12권4호
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    • pp.631-641
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    • 1988
  • 본 연구에서는 선형 탄성 해석의 결과를 이용하여 초기 하중 증분량을 결정하 는 방법을 제안한다. 또 Crisfield의 방법에서 부분적으로 발생하는 수치적 불안정 을 개선하고 수치 해석의 효율을 제고시키기 위하여 하중 증감의 판정 방법과 변위 증 분 길이의 예측 방법을 제안한다.

샤시 프레임에 용접한 스트러트 접합부의 설계 민감도 해석 (Design Sensitivity Analysis of Welded Strut Joints on Vehicle Chassis Frame)

  • 김동우;양성모;김형우;배대성
    • Journal of Welding and Joining
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    • 제16권3호
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    • pp.141-147
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    • 1998
  • Design sensitivity analysis of a vehicle system is an essential tool for design optimization and trade-off studies. Most optimization algorithms require the derivatives of cost and constraint function with respect to design in order to calculate the next improved design. This paper presents an efficient algorithm application for the design sensitivity analysis, using the direct differentiation method. A mounting area of suspension that welded on chassis frame is analyzed to show the validity and the efficiency of the proposed method. A mounting area of suspension that welded on chassis frame is analyzed to show the validity and the efficiency of the proposed method.

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건물 에너지 절약요소 적용을 통한 목조주택의 에너지 성능 개선 (Improvement of Energy Efficiency in Wood Frame House with Energy Efficient Methods)

  • 김세종;박주생;이전제
    • Journal of the Korean Wood Science and Technology
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    • 제41권1호
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    • pp.77-86
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    • 2013
  • 본 연구는 목조주택의 건물에너지 성능을 평가하고 개선하기 위해 수행되었다. 목조주택의 에너지 요구량을 산정하기 위하여 CE3 (Construction Energy Efficiency Evaluation) 웹기반 소프트웨어를 사용하였고 그 결과 대상 주택의 연간 난방에너지 요구량은 바닥면적 1 $m^2$당 160 kWh로 계산되었다. 난방에너지 요구량을 줄이기 위해 다음 4가지의 에너지 절감방법을 채택하였다; a) 건물형태의 단순화, b) 창호면적의 축소, c) 고성능 창호의 적용, d) 폐열회수환기장치의 적용. 열관류율 1 $W/m^2{\cdot}K$의 고성능창호로 교체할 경우 대상 주택의 난방에너지 요구량은 80 $kWh/m^2{\cdot}a$로 감소하였다. 4가지 방법을 조합하여 적용하면 고성능창호와 폐열회수환기장치를 함께 적용하였을 때 난방에너지 요구량은 34.5 $kWh/m^2{\cdot}a$로 감소하여 가장 우수한 성능을 나타냈다.

Whole Frame Error Concealment with an Adaptive PU-based Motion Vector Extrapolation for HEVC

  • Kim, Seounghwi;Lee, Dongkyu;Oh, Seoung-Jun
    • IEIE Transactions on Smart Processing and Computing
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    • 제4권1호
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    • pp.16-21
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    • 2015
  • Most video services are transmitted in wireless networks. In a network environment, a packet of video is likely to be lost during transmission. For this reason, numerous error concealment (EC) algorithms have been proposed to combat channel errors. On the other hand, most existing algorithms cannot conceal the whole missing frame effectively. To resolve this problem, this paper proposes a new Adaptive Prediction Unit-based Motion Vector Extrapolation (APMVE) algorithm to restore the entire missing frame encoded by High Efficiency Video Coding (HEVC). In each missing HEVC frame, it uses the prediction unit (PU) information of the previous frame to adaptively decide the size of a basic unit for error concealment and to provide a more accurate estimation for the motion vector in that basic unit than can be achieved by any other conventional method. The simulation results showed that it is highly effective and significantly outperforms other existing frame recovery methods in terms of both objective and subjective quality.

에지히스토그램을 이용한 압축영역에서 고속키 프레임 추출기법 (Fast Key Frame Extraction in the Compressed Domain using Edge Histogram)

  • 박준형;엄민영;김명호;최윤식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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    • pp.536-538
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    • 2005
  • As multimedia data and huge-Quantity video data having been increasingly and commonly used, the key frame algorithm, as one of the methods for manipulating these kinds of data, became an important matter and has been studied for many years. But the formerly proposed key frame extraction methods take much processing time or need complex calculations due to decoding processes. In order to solve these problems which the former methods have and to enhance the key frame extraction efficiency, a novel key frame extraction method in compressed domain is proposed in this paper. In this method we get an edge histogram for each I-frame in DCT domain and then extract the key frames by means of histogram difference metric. Experimental results show that our algorithm achieves fast processing speed and high accuracy.

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기존 골조의 내진성능 향상을 위한 철근콘크리트 현장타설 끼움벽의 보강성능 평가 (Evaluation on Seismic Performance of Existing Frame retrofitted with RC CIP Infill Walls)

  • 김선우;윤현도;김윤수;지상규
    • 한국방재학회:학술대회논문집
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    • 한국방재학회 2008년도 정기총회 및 학술발표대회
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    • pp.53-56
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    • 2008
  • A reinforced concrete (RC) cast-in-place (CIP) infill wall retrofitting method may provide an improved seismic performance and economical efficiency for the non-ductile rahmen structures. In this study, four one story-one bay non-ductile frame were constructed and retrofitted with CIP infill wall to evaluate seismic performance of CIP infill wall-frame. From the test results, infill wall-frame exhibited a marked increase in shear strength compared to non-ductile RC frame specimen. But the ductility and story-drift at maximum load were decreased when shear strength of infill wall larger than that of existing RC frame. Therefore, it is confirmed that adequate reinforcement detail is required to assure sufficient seismic performance.

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CONTROLLED K-FRAMES IN HILBERT C*-MODULES

  • Rajput, Ekta;Sahu, Nabin Kumar;Mishra, Vishnu Narayan
    • Korean Journal of Mathematics
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    • 제30권1호
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    • pp.91-107
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    • 2022
  • Controlled frames have been the subject of interest because of their ability to improve the numerical efficiency of iterative algorithms for inverting the frame operator. In this paper, we introduce the notion of controlled K-frame or controlled operator frame in Hilbert C*-modules. We establish the equivalent condition for controlled K-frame. We investigate some operator theoretic characterizations of controlled K-frames and controlled Bessel sequences. Moreover, we establish the relationship between the K-frames and controlled K-frames. We also investigate the invariance of a controlled K-frame under a suitable map T. At the end, we prove a perturbation result for controlled K-frame.

낮은 비트 레이트에서의 동영상 부호화를 위한 I-frame의 고능율 부호화 (An Efficiency Intra frame coding for low bit-rate video coding)

  • 조경식;이연문;정차근
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2000년도 하계종합학술대회 논문집(4)
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    • pp.23-26
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    • 2000
  • 본 논문에서는 정확한 비트 제어가 가능한 I-frame의 효율적인 부호화 방법을 제안한다. 기존 H.263+의 DCT 계수들을 트리 구조로 재구성하여 각 계수에 대해 임베이드 제로트리 부호화 알고리즘을 적용시켜 부호화함으로써 코딩 효율을 향상시킴과 동시에 비트 율의 제어가 용이하도록 한다. 제안 방법의 유효성을 검증하기 위해 표준 동영상에 대한 컴퓨터 모의 실험 결과 제안 방법은 기존의 부호화 방법에 비해 비트 제어가 용이하고 부호화 성능이 개선됨을 확인했다.

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시간해상도 감소 트랜스코딩을 위한 ASW움직임벡터 정밀화 알고리즘에 관한 연구 (Efficient Motion Refinement Algorithm based on ASW for Reduced Frame-Rate Video Transcoder)

  • 서동완;권혁민;최윤식
    • 대한전자공학회:학술대회논문집
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    • 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅳ
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    • pp.2044-2047
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    • 2003
  • In this paper, we propose efficient motion vector refinement algorithm for frame-rate reduction transcoding. The proposed algorithm is to set the search range for motion refinement based on the incoming motion vector. The algorithm calculates the importance of motion vector of the skipped frame and then selects two motion vector to set search range. Through this process, we determine the accuracy of incoming motion vector and set the search range lot refinement adaptively by means of the accuracy. In experiments, we show efficiency of our algorithm to reduce the search points for refinement.

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