• Title/Summary/Keyword: Multi-Frame

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LMI based criterion for reinforced concrete frame structures

  • Chen, Tim;Kau, Dar;Tai, Y.;Chen, C.Y.J.
    • Advances in concrete construction
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    • v.9 no.4
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    • pp.407-412
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    • 2020
  • Due to the influence of nonlinearity and time-variation, it is difficult to establish an accurate model of concrete frame structures that adopt active controllers. Fuzzy theory is a relatively appropriate method but susceptible to human subjective experience to decrease the performance. To guarantee the stability of multi-time delays complex system with multi-interconnections, a delay-dependent criterion of evolved design is proposed in this paper. Based on this criterion, the sector nonlinearity which converts the nonlinear model to multiple rule base of the linear model and a new sufficient condition to guarantee the asymptotic stability via Lyapunov function is implemented in terms of linear matrix inequalities (LMI). A numerical simulation for a three-layer reinforced concrete frame structure subjected to earthquakes is demonstrated that the proposed criterion is feasible for practical applications.

Improvement of Visualization System for Player's Sequential Forms in Sports Broadcasting

  • Lee, Jae-Ho;Lee, Sang-Gil
    • Proceedings of the Korean Society of Broadcast Engineers Conference
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    • 1997.06a
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    • pp.119-124
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    • 1997
  • We improved a visualization system for a player's sequential forms called‘Multi-Motion’which has ever been used in NHK live broadcasting. It is to extract only the player's forms from background, and overlap them into one frame sequentially after fast performance for a vault game of gymnastics. It helps TV viewers understand the player's performing forms easily. We increased the performance of Multi-Motion by shortening the distance between the current frame and the reference frame, and the synthesis of the reference frame.

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Multi-gigabyte Multimedia Collections Using Qis Visualization Spreadsheet

  • 지승현
    • Proceedings of the Korea Contents Association Conference
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    • 2004.05a
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    • pp.207-214
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    • 2004
  • The Qis visualizational spreadsheet environment is shown to be extremely effective in supporting the visualization of multi-gigabyte multi-dimensional data sets. The Qis has a novel framestack that is the 3-D arrangement of spreadsheet elements. It enables the visualization spreadsheet to effectively manage, rapidly organize, and compactly encapsulate multi-dimensional data sets for visualization. Using several experiments with scientific users, the Qis has been demonstrated to be a highly interactive visual browsing tool for the analysis o( multidimensional data, displaying 2-D 3-D graphics, and rendering in each frame of the spreadsheet.

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Beam-Column Connection with 1200mm Deep Multi-Reduced Taper Beam for Intermediate Moment Frame (깊이 1200mm급 변단면보의 중간모멘트골조용 내진접합부 개발)

  • Jung, Si-Hwa;Alemayehe, Robel Wondimu;Park, Man-Woo;Ju, Young-Kyu
    • Journal of the Architectural Institute of Korea Structure & Construction
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    • v.35 no.4
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    • pp.135-146
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    • 2019
  • Deep beam has high section modules compared with shallow beam of the same weight. However, deep beam has low rotational capacity and high possibility of brittle failure so it is not possible to apply deep beams with a long span to intermediate moment frames, which should exhibit a ductility of 0.02rad of a story drift angle of steel moment frames. Accordingly, KBC and AISC limit the beam depth for intermediate and special moment frame to 750mm and 920mm respectively. The purpose of this paper is to improve the seismic performance of intermediate moment frame with 1200mm depth beam. In order to enhance vulnerability of plastic deformation capacity of deeper beam, Multi-Reduced Taper Beam(MRTB) shape that thickness of beam flange is reinforced and at the same time some part of the beam flange width is weakened are proposed. Based on concept of multiple plastic hinge, MRTB is intended to satisfy the rotation requirement for intermediate moment frame by dividing total story drift into each hinge and to prevent the collapse of the main members by inducing local buckling and fracture at the plastic hinge location far away from connection. The seismic performance of MRTB is evaluated by cyclic load test with conventional connections type WUF-W, RBS and Haunch. Some of the proposed MRTB connection satisfies connection requirements for intermediate moment frame and shows improved the seismic performance compared to conventional connections.

Reduction Algorithm of Environmental Noise by Multi-band Filter (멀티밴드필터에 의한 환경잡음억압 알고리즘)

  • Choi, Jae-Seung
    • Journal of the Korea Society of Computer and Information
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    • v.17 no.8
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    • pp.91-97
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    • 2012
  • This paper first proposes the speech recognition algorithm by detection of the speech and noise sections at each frame, then proposes the reduction algorithm of environmental noise by multi-band filter which removes the background noises at each frame according to detection of the speech and noise sections. The proposed algorithm reduces the background noises using filter bank sub-band domain after extracting the features from the speech data. In this experiment, experimental results of the proposed noise reduction algorithm by the multi-band filter demonstrate using the speech and noise data, at each frame. Based on measuring the spectral distortion, experiments confirm that the proposed algorithm is effective for the speech by corrupted the noise.

Comparison of Vibration Characteristics of a Multi-leaf Spring and a Tapered Leaf Spring of a Heavy Truck (대형트럭 다판 스프링과 테이퍼 판스프링의 진동특성 비교)

  • Oh Chae-Youn;Moon Il-Dong
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.29 no.2 s.233
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    • pp.270-276
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    • 2005
  • This paper develops the flexible computational model of a heavy truck by interfacing the frame modeled as a flexible body to the heavy truck's computational model composed of rigid bodies. The frame is modeled by the finite element method. Three torsional modes and three bending modes of the frame are considered for the interface of the heavy truck's computational model. The actual vehicle test is conducted off road with a velocity of 20km/h. The vertical accelerations at the cab and front axle are measured in the test. For the verification of the developed computational model, the measured vertical acceleration profiles are compared with the simulation results of the heavy truck's flexible computational model. E grade irregular road profile of ISO is used as an excitation input in the simulation. The verified flexible computational model is used to compare the vibration characteristics of a front suspension system having a multi-leaf spring and that having a tapered leaf spring. The comparison results show that the front suspension having a tapered leaf spring has a higher vertical acceleration at the front axle but a lower vertical acceleration at the cab than the suspension system having a multi-leaf spring.

An Improved GoGOP Structure for Multi-view Video Coding in H.264/AVC (H.264/AVC에서 다시점 비디오 부호화를 위한 향상된 GoGOP 구조)

  • Shin, Kwang-Mu;Lee, Seo-Young;Kim, Sung-Min;Chung, Ki-Dong
    • Journal of KIISE:Computing Practices and Letters
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    • v.14 no.3
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    • pp.271-275
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    • 2008
  • Corresponding recent continuous development of multimedia technology with improved desire of using various contents, a new realistic feeling media technology is being created. Of them all, multi-view video is being researched actively as foundation technology of 3D TV, free-view point video etc. But encoding time and bit-rate are increased as view numbers are increased. In this paper we propose improved GoGOP structure to enhance the coding efficiency of multi-view video by applying methods which are using techniques such as Key frame position adjustment, dynamically changing the number of I frame and B frame. As experimental results, technique proposed in this paper reduces bit-rate having similar PSNR value compared with Anchor structure.

Automation of Fatigue Durability Analysis for Welded Bogie Frame Using a Multi-Agent Based Engineering Framework (멀티 에이전트 기반 엔지니어링 프레임워크를 이용한 용접대차틀 피로내구해석의 자동화)

  • Bang, Je-Sung;Han, Seung-Ho;Lee, Jai-Kyung;Park, Seong-Whan;Rim, Chae-Whan;Song, See-Yeob
    • Korean Journal of Computational Design and Engineering
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    • v.12 no.4
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    • pp.308-320
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    • 2007
  • A multi-agent and web based engineering framework concerning the automation of fatigue durability analysis for welded bogie frame of railway vehicles is presented. Mostly, this kind of design or analysis includes complex workflow, huge amounts of information processing, and problem solving. Macro programs of I-DEAS, APDL of ANSYS, and in-house fatigue code are utilized for parametric geometry representation, automatic mesh generation, static stress analysis, fatigue durability analysis, post-processing, and data sorting. The engineering framework is implemented on the JADE. Since every task requires a fairly complex process and specialized knowledge, the multi-agent based framework is very useful to keep the independency among several disciplines or tasks and to use distributed hardware and software resources. All engineering programs are integrated by XML wrapper. Related database of the engineering framework and web based user interfaces are also developed. A parametric study is carried out to take into account the effect of geometrical change of transom support bracket on its cumulative fatigue damage. The developed engineering framework reduced remarkably the time and costs required in designing and solving engineering problems.

Consecutive-Frame Super-Resolution considering Moving Object Region

  • Cho, Sung Min;Jeong, Woo Jin;Jang, Kyung Hyun;Choi, Byung In;Moon, Young Shik
    • Journal of the Korea Society of Computer and Information
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    • v.22 no.3
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    • pp.45-51
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    • 2017
  • In this paper, we propose a consecutive-frame super-resolution method to tackle a moving object problem. The super-resolution is a method restoring a high resolution image from a low resolution image. The super-resolution is classified into two types, briefly, single-frame super-resolution and consecutive-frame super-resolution. Typically, the consecutive-frame super-resolution recovers a better than the single-frame super-resolution, because it use more information from consecutive frames. However, the consecutive-frame super-resolution failed to recover the moving object. Therefore, we proposed an improved method via moving object detection. Experimental results showed that the proposed method restored both the moving object and the background properly.

Reduction of Radio-Frequency Interference in Metal-Framed Smartphone Using EBG Structures (EBG 구조를 이용한 메탈 프레임 스마트폰 내의 전자파 간섭 저감)

  • Park, Hyun Ho
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.27 no.10
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    • pp.945-948
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    • 2016
  • Recent premium smartphones commonly employ a metal frame and this trend is currently spreading over mid-range smartphones. However, the metal frame becomes a good coupling path of electromagnetic noises emitted from digital components in smartphones and then increases radio-frequency interference(RFI) to RF antennas located at top and bottom sides of smartphones. This paper proposed a metal frame with EBG(Electromagnetic Band Gap) structure to reduce the noise coupling to antenna by suppressing surface wave on the metal frame. By simulation, it is confirmed that the proposed metal frame with $7{\times}6$ mushroom-type EBG array pattern with multi-via can reduce the noise coupling to RF antenna by about 20 dB.