• 제목/요약/키워드: Moving Pattern

검색결과 597건 처리시간 0.032초

움직이는 평면으로의 충돌 제트에 대한 수치해석 (NUMERICAL ANALYSIS OF JET IMPINGING ON A MOVING PLATE)

  • 강수진;서석원;이관수
    • 한국전산유체공학회:학술대회논문집
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    • 한국전산유체공학회 2011년 춘계학술대회논문집
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    • pp.129-134
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    • 2011
  • In this paper, the confined single slot jet impingement is investigated numerically. Although the geometry of the jet impingement is simple, the flow pattern of the jet impingement is complex and the numerical results of the jet impingement is affected much by numerical methods. The first goal of this study is to analyze the effects of Reynolds models and numerical spatial discretization schemes on the results of heat transfer performance and the flaw characteristics and to select the best method. Various versions of the low Reynolds number k-epsilon turbulence models are compared. Using the selected numerical method, the flow field and heat transfer characteristics of confined single slot jet impingement on a moving plate are analyzed.

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주문생산을 위한 자동제도 토르소 원형연구 -20대 여성을 중심으로- (A Study on the Development of Torso Pattern for an Automated Order-based Manufacturing System - focused on women in the twenties -)

  • 황수연;남윤자
    • 대한인간공학회지
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    • 제21권1호
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    • pp.67-80
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    • 2002
  • An efficient torso pattern has been developed to cope with the future trend of order-based, individualized production like the E.C.(Electronic Commerce) in the apparel industry, and to make a database foundation of automatic garment pattern drafting. For this purpose, a non-contact three-dimensional anthropometric measurement system was used to provide a lot of accurate body data for better individual fit, and an automatic pattern drafting system that can easily generate various size patterns and construct a pattern database has been developed too. The subjects of this research were 18 to 24 year-old women whose data had been gathered through the Korean national investigation of anthropometry for industrial standards in 1997 and various body shapes were analyzed by the measurements. And a special software system has been developed to verify the validity of newly proposed drawing rules. The results of sensory evaluation for appearance and moving fitness of the new torso pattern showed a significant improvement in individual fit even for the figures with large deviation from standard shape compared with the results of the traditional one.

영상의 전역 특징과 이동객체의 지역 특징을 융합한 동영상 검색 디스크립터 설계 (A Descriptor Design for the Video Retrieval Combining the Global Feature of an Image and the Local of a Moving Object)

  • 정병만;이규원
    • 한국정보통신학회논문지
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    • 제18권1호
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    • pp.142-148
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    • 2014
  • 실시간으로 입력되는 영상으로부터 이동객체의 움직임 특징을 이용하여 움직임 분석에 적합한 디스크립터를 제안한다. 배경과 이동객체를 분리하기 위하여 배경학습을 행한다. 연속적으로 추출된 이동객체의 1차 모멘트를 이용하여 각 객체별로 이동 궤적을 추출한다. 연결 리스트를 이용하여 객체별로 추출된 1차 모멘트를 관리한다. 디스크립터는 격자 형태로 미리 지정된 9개의 지점 근방에 포함되는 이동객체의 1차 모멘트 좌표와 객체가 화면에 출현하는 시작 프레임 번호, 화면에서 사라지는 마지막 프레임 번호로 구성된다. 제안하는 전역 및 지역 특징 융합 디스크립터에 의한 비디오 검색은 둘 중 하나의 특징을 사용하는 기존의 방법에 비하여 효과적임을 확인하였다.

영상의 전역 특징과 이동객체의 지역 특징을 융합한 움직임 디스크립터 설계 (A motion descriptor design combining the global feature of an image and the local one of an moving object)

  • 정병만;이규원
    • 한국정보통신학회:학술대회논문집
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    • 한국정보통신학회 2012년도 추계학술대회
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    • pp.898-902
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    • 2012
  • 실시간으로 입력되는 영상으로부터 이동객체의 움직임 특징을 이용하여 움직임 분석에 적합한 디스크립터를 제안한다. 배경과 이동객체를 분리하기 위하여 배경학습을 행한다. 연속적으로 추출된 이동객체의 1차 모멘트를 이용하여 각 객체별로 이동 궤적을 추출한다. 연결 리스트를 이용하여 객체별로 추출된 1차 모멘트를 관리한다. 디스크립터는 격자 형태로 미리 지정된 9개의 지점 근방에 포함되는 이동객체의 1차 모멘트 좌표와 객체가 화면에 출현하는 시작 프레임 번호, 화면에서 사라지는 마지막 프레임 번호로 구성된다. 제안하는 전역 및 지역 특징융합 디스크립터에 의한 비디오 검색은 둘 중 하나의 특징을 사용하는 기존의 방법에 비하여 효과적임을 확인하였다.

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다항식 근사를 이용한 이족보행 로봇의 보행패턴 생성 (Walking Pattern Generation for a Biped Robot Using Polynomial Approximation)

  • 강윤석;박정훈;임홍재
    • 대한기계학회:학술대회논문집
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    • 대한기계학회 2004년도 추계학술대회
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    • pp.567-572
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    • 2004
  • In this research, a stable walking pattern generation method for a biped robot is presented. A biped robot is considered as constrained multibody system by several kinematic joints. The proposed method is based on the optimized polynomial approximation of the trunk motion along the moving direction. Foot motions can be designed according to the ground condition and walking speed. To minimize the deviation from the desired ZMP, the trunk motion is generated by the fifth order polynomial approximation. Walking simulation for a virtual biped robot is performed to demonstrate the effectiveness and validity of the proposed method. The method can be applied to the biped robot for stable walking pattern generation.

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이진 격자 패턴 이미지를 이용한 비접촉식 평면 구동기의 면내 위치(x, y, $\theta$) 측정 방법 (A Novel Measuring Method of In-plane Position of Contact-Free Planar Actuator Using Binary Grid Pattern Image)

  • 정광석;정광호;백윤수
    • 한국정밀공학회지
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    • 제20권7호
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    • pp.120-127
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    • 2003
  • A novel three degrees of freedom sensing method utilizing binary grid pattern image and vision camera is presented. The binary grid pattern image is designed by Pseudo-Random Binary Arrays and referenced to encode in-plane position of a moving stage of the contact-free planar actuator. First, the yaw motion of the stage is detected using fast image processing and then the other planar positions, x and y, are decoded with a sequence of images. This method can be applied to the system that needs feedback of in-plane position, with advantages of a good accuracy and high resolution comparable with the encoder, a relatively compact structure, no friction, and a low cost. In this paper, all the procedures of the above sensing mechanism are described in detail, including simulation and experiment results.

Comparing Energy Consumption following Flight Pattern for Quadrotor

  • Jee, Sunho;Cho, Hyunchan
    • 전기전자학회논문지
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    • 제22권3호
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    • pp.747-753
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    • 2018
  • Currently, many companies have succeeded in logistics delivery experiments utilizing drone and report it. When a drone is used commercially, long-term flight is an important performance that a drone should have. However, unlike vehicles operated on the ground, drone is a vehicle that continues to consume energy when maintaining the current altitude or moving to the destination. Therefore, the drones can fly for a long time as the capacity of the battery is large, but the batteries with large capacity are restricted by heavy weight and it acts as a limiting factor in a commercial use. To address this issue, we attempt to compare how far we can fly than forward flight based on the flight pattern with the same energy consumption condition. In this paper, the comparison of energy consumption was performed in three flight pattern, forward flight without altitude change and forward flight with altitude change, by computer simulation and it shows the increasing of flight distances when the quadrotor fly with altitude change from high altitude to low altitude.

근전도신호의 패턴인식 및 힘추정을 통한 의수의 지능적 궤적제어에 관한 연구 (A Study on Intelligent Trajectory Control for Prosthetic Arm by Pattern Recognition & Force Estimation Using EMG Signals)

  • 장영건;홍승홍
    • 대한의용생체공학회:의공학회지
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    • 제15권4호
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    • pp.455-464
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    • 1994
  • The intelligent trajectory control method that controls moving direction and average velocity for a prosthetic arm is proposed by pattern recognition and force estimations using EMG signals. Also, we propose the real time trajectory planning method which generates continuous accelleration paths using 3 stage linear filters to minimize the impact to human body induced by arm motions and to reduce the muscle fatigue. We use combination of MLP and fuzzy filter for pattern recognition to estimate the direction of a muscle and Hogan's method for the force estimation. EMG signals are acquired by using a amputation simulator and 2 dimensional joystick motion. The simulation results of proposed prosthetic arm control system using the EMG signals show that the arm is effectively followed the desired trajectory depended on estimated force and direction of muscle movements.

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역전달 신경회로망을 이용한 심전도 신호의 패턴분류에 관한 연구 (ECG Pattern Classification Using Back Propagation Neural Network)

  • 이제석;이정환;권혁제;이명호
    • 전자공학회논문지B
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    • 제30B권6호
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    • pp.67-75
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    • 1993
  • ECG pattern was classified using a back-propagation neural network. An improved feature extractor of ECG is proposed for better classification capability. It is consisted of preprocessing ECG signal by an FIR filter faster than conventional one by a factor of 5. QRS complex recognition by moving-window integration, and peak extraction by quadratic approximation. Since the FIR filter had a periodic frequency spectrum, only one-fifth of usual processing time was required. Also, segmentation of ECG signal followed by quadratic approximation of each segment enabled accurate detection of both P and T waves. When improtant features were extracted and fed into back-propagation neural network for pattern classification, the required number of nodes in hidden and input layers was reduced compared to using raw data as an input, also reducing the necessary time for study. Accurate pattern classification was possible by an appropriate feature selection.

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레퍼런스 패턴 기반 면내 위치 측정 방법 (Measuring Method of In-plane Position Based On Reference Pattern)

  • 정광석
    • 융복합기술연구소 논문집
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    • 제2권1호
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    • pp.43-48
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    • 2012
  • Generally, in-plane position of moving object is measured referring to the reference pattern attached to the object. From optical camera to magnetic reluctance probe, there are many ways detecting a variation of the periodical pattern. In this paper, the various operating principles developed for in-plane positioning are reviewed and compared each other. And, a novel method measuring large rotation as well as x, y linear displacements is suggested, including a detailed description of the overall system layout. It is a modified version of the surface encoder, which is a robust digital measuring method. From the surface encoder, the rotation of an object is measured indirectly through a compensated input of optical servo and independently of linear displacements. So, the operating range can be extended simply by enlarging the reference pattern, without magnifying the decoding units.

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