• Title/Summary/Keyword: 3 dimensional circumstance

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A Study of the 3D-Reconstruction of indoor using Stereo Camera System (스테레오 카메라를 이용한 실내환경의 3차원 복원에 관한 연구)

  • Lee Dong-Hun;Um Dae-Youn;Kang Hoon
    • Journal of the Korean Institute of Intelligent Systems
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    • v.15 no.1
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    • pp.42-47
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    • 2005
  • In this papcr, we address the 3D reconstruction of the indoor circumstance using what the data is extracted by a pall of image from Stereo Camera. Generally sucaking, there arc three methods to extract 3-Dimensional data using IR sensor, Laser sensor and Stereo camera sensor. The best is stereo camera sensor which can show a high performance at a reasonable price. We used 'Window Correlation Matching Method' to extract 3-Dimensional data in stereo image. We proposed new Method to reduce error data, said 'Histogram Weighted Hough Transform'. Owing to this mettled, we reduced error data in each stereo image. So reconstruction is well done. 3-Dimensional Reconstruction is accomplished by using the DirectX that is well known as 3D-Game development tool. We show that the stereo camera can be not only used to extract 3-dimensional data but also applied to reconstruct the 3-Dimensional circumstance. And we try to reduce the error data using various method.

Kinematic Based Walking Pattern of Biped robot (기구학을 이용한 이족보행 로봇의 보행패턴)

  • Kim, Dong Won
    • Journal of Internet of Things and Convergence
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    • v.4 no.2
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    • pp.7-11
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    • 2018
  • In this paper, kinematic based walking pattern generation of biped walking robot is reviewed. Biped walking robot should be consisted of 6 Degree of Freedom(DOF) for each leg to walk properly in 3 dimensional circumstance. In this paper, simple structure of biped robot is depicted for walking pattern firstly. After fixing path of ankle of the robot, angle joints are coming from kinematic equatioins. Coordination of joints of a robot was set for dynamic analysis also. So walking pattern of a robot will be designed using dynamic equations of coordination of joint angles. Finally, setting of ankle of robot and pattern generation are key procedures of the robot walking.

Study of 3-dimensional measurement of object shape by optical ring method (광링식 3차원 형상 측정법에 관한 연구)

  • 박정환;강영준
    • Proceedings of the Korean Society of Precision Engineering Conference
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    • 1995.04b
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    • pp.408-413
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    • 1995
  • Nowadays, manufacturing system is trending toward integrated circumstance by helping of CAD/CAM/CAT. To use this system effectively, it is necessary to get exact 3 dimensional surface data of an object. We have been using contact method to measure 3 dimensional object profile. But his method has demerit of leaving scrach or small distortion on the object. To improve this, a non-contact measuring method using optical system is adopted. In this paper, We propose optical ring method. Withthis system, We could measure displacement of the object in the range of 45mm having 150mm having 150 .mu. m resolution with no scratch or distortion.

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3-Dimensional Computations of the Weak Shock Wave Discharged from the Exit of Duct (관출구로부터 방출되는 약한 충격파에 관한 3 차원 수치해석)

  • Kweon, Yong-Hun;Shin, Hyun-Dong;Kim, Heuy-Dong;Lee, Dong-Hoon
    • Proceedings of the KSME Conference
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    • 2003.04a
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    • pp.1742-1747
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    • 2003
  • When a shock wave is discharged from the exit of a duct, complicated flow is formed near the duct exit. The flow field is much more complicated under the ground effects or any other objects near the exit of a duct, such as the circumstance near the exit of the high-speed railway tunnel. The resulting flow is essentially three-dimensional unsteady with the effects of strong compressibility. In the current study, three-dimensional flow fields of the weak shock wave which is discharged from the exit of a duct are numerically investigated using a CFD method. Computations are performed for the weak shock wave in the range below 1.5. The results obtained show that the directivity and magnitude of the weak shock discharged strongly depend upon the Mach number of initial shock wave and are significantly influenced by the ground effects.

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Numerical Analysis on the Effect of Fractured Zone on the Displacement Behavior of Tunnel (파쇄대가 터널 주변 암반의 변형 거동에 미치는 영향에 대한 수치해석적 연구)

  • Kim Chang-Yong;Kim Kwang-Yeom;Moon Hyun-Koo;Lee Seung-Do;Baek Seung-Han
    • Tunnel and Underground Space
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    • v.16 no.3 s.62
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    • pp.218-231
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    • 2006
  • Anisotropic/heterogeneous rock mass shows various deformation behavior types due to tunnelling because deformation behavior is largely controlled by the spacial characteristics of geological factors such as faults, joints and fractured zone in rock mass. In this paper 2-dimensional numerical analysis on the several influencing factors is performed considering fractured zone located near tunnel. This numerical analysis shows that deformation behavior of tunnel are very different according to the width and the location of fractured zone and supper method. However, 3-dimensional analysis is necessary to consider 3-dimensional geometrical characteristics sufficiently since discontinuity and fractured zone have 3-dimensional geometry. Also flexible design/construction guidelines for tunnelling are required to cope with uncertain ground condition and circumstance for technically safe and economic tunnel construction.

Estimation of Vertical Profiles and Total Amount of Ozone Using Two-Dimensional Photochemical Transfer Model During the Period of 1995-1996 at Pohang (2차원 광화학수송모델을 이용한 포항지역의 1995-1996년 기간동안 오존의 연직 프로파일 및 전량 추정)

  • Moon, Yun-Seob
    • Journal of Korean Society for Atmospheric Environment
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    • v.22 no.3
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    • pp.271-285
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    • 2006
  • A two-dimensional photochemical transport model (2D PTM) is simulated to describe the transport and chemical reaction of ozone related to aerosols in the troposphere and stratosphere. The vertical profiles and total amounts of ozone, which are advected by both residual Eulerian circulation and the adiabatic circulation under certain circumstance, have been compared with the observation data such as ozonesondes, Brewer spectrometer, the Upper Atmosphere Research Satellite (UARS), and the Total Ozone Mapping Spectrophotometer (TOMS). As a result, we find that the observed distribution of ozone Is adequately reproduced in the model at middle and high latitude in the Northern Hemisphere as well as at Phang ($36^{\circ}\;02'N,\;129^{\circ}\;23'E$) in South Korea. In particular, the 2D PTM is well simulated in the ozone decrease due to the Pinatubo volcanic eruption in 1991. However, ozone mixing ratio are more underestimated than those of UARS and ozonesondes, because are very sensitive to the latitude of transport across the tropopause associated with both Rummukainen errors and off-line model. Relative mean bias errors and relative root mean square errors of ozone calculations using the 2D PTM are shown within${\pm}10%$, respectively.

Numerical Simulation of Transonic Flow Region about ONERA M6 Wing (ONERA M6 3차원 날개에 대한 천음속 유동해석)

  • Lee K. S.;Hong S. K.
    • 한국전산유체공학회:학술대회논문집
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    • 2000.10a
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    • pp.25-31
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    • 2000
  • Three-dimensional transonic flows over the ONERA M6 wing have been computed by many researchers as a benchmark test case. The flow is attractive since it involves $\lambda$-shaped shock on the upper wing at certain Mach numbers. Because of this well-known circumstance, present study is also required of us to study the effect of various turbulent models as well as the computational accuracy through a data exchange program with the Arnold Engineering Development Center (AEDC) of the U.S. Air Force. As a first attempt, the transonic flow at M=0.84, $\alpha=3.06^{\circ}$, Re=11.72E6 is tackled and the CFDS code demonstrates its compatibility with both experimental data and the results of WIND code available in the open domain.

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A Study on the Deduction of 3-Dimmensional Visual Structure and measurement of Quantitative Openness in Accordance with Spatial Probe Routes (공간탐색경로에 따른 3차원 시각구조 도출과 정량적 개방도 측정에 관한 연구)

  • Kim, Suk-Tae
    • Korean Institute of Interior Design Journal
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    • v.19 no.6
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    • pp.112-120
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    • 2010
  • Human can recognize the environment by detecting spatial perception, and most of environmental perception depends on visual perception. In view that the acquisition of spatial information is accomplished through visual recognition, analysis of visual structure contained in the space is thought to be very important sector in studying the characteristic of the space. The history of studies on visual structure of space, however, wasn't too long, and furthermore most of the theories up to now focused on static and planar principles. Under this circumstance, this study is intended to suggest new theory by combining Isovist theory and VGA theory that have been actively discussed as the theory on visual perception-based spatial structure and supplementing them between each other to expand into 3-dimensional model. The suggested theory is a complex principle in dimensional and dynamic form in consideration of visual direction, which forms 3-dimentional virtual model that enables visualization of the property of spatial structure as the routine discriminating whether visual connection is made between viewing point and target point, and the target point is included in the visual field quadrangular pyramid or not. Such model was built up by an analysis application where four probe paths were applied to simulate the visual structure that occurs in virtual space, and then the characteristics were analyzed through quantification. In result, in spite of the path with equal space and equal length, significant difference in the acquired quantity of spatial information could be found depending on the probe sequence. On the contrary, it was found that probe direction may not affect the acquired quantity of information and visual property of the space.

Sensibility Evaluation Model Research as to The Three-dimensional Surface Light Source set In The Interior (실내 3D 입체 면광원 조명연출에 관한 감성평가 모형 연구)

  • Lee, Jin-Sook;Park, Ji-Young;Jeong, Chan-Ung
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.29 no.6
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    • pp.14-26
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    • 2015
  • This study has been conducted so as to analyse user's sensibility on lighting method, correlated color temperature and illumination by composing surface light source, which was projected onto a unit side of interior wall, ceiling and floor. 1) As an analyzed results of the sensibility images, it showed that the "snug & tender" value had got higher when the correlated color temperature got lower. And the "energetic, cheerful" value had got higher when the level of illuminance got lower. Furthermore, the "unusual, unique" showed higher value on the illuminated floor circumstance. Finally, the higher correlated color temperature had been, "energetic, cheerful" value also got higher. 2) As a result of multi-regression analysis, it was found that 3000K and 100lx had the biggest influence on 'snug' image while 5,500K, 500lx had the biggest influence on 'energetic' image. In addition, it was found that the illuminated floor had a big influence on 'unusual' image while 500lx had the biggest influence on 'refined' image.

The Effective Heating Control Method of the Radiant Floor Heating System (바닥복사 난방공간의 효율적인 난방제어방법)

  • Cho, S.H.;Tae, C.S.
    • Korean Journal of Air-Conditioning and Refrigeration Engineering
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    • v.8 no.3
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    • pp.317-329
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    • 1996
  • By describing the floor slab of a radiant heating system as a one dimensional transient heat exchanger problem, a dynamic analysis model to incorperate with TRNSYS program was developed and their results were compared with experimental results. Results showed that the both of TPOC(Two Parameter On-off Control) and TPSC(Two Parameter Switching Control) method using room air temperature and floor surface temperature as the control parameters does not maintain room air and floor surface temperature exactly at the setting temperatures. But TPSC method is a better candidate for the temperature regulations of room air and floor surface temperature than TPOC method which can keep on the upper and lower limit temperature according to outside temeperature and wall structure etc. And better thermal circumstance can be given by TPSC method than On-off and TPOC method and the overheating which can be occured at the radiant floor heating system with on-off heating control will be reduced.

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