• Title/Summary/Keyword: Pattern Plane

Search Result 895, Processing Time 0.026 seconds

Design of Omnidirectional Antennas Composed of the Parabolic Reflector (파라볼라 반사경으로 구성된 옴니안테나 설계)

  • 이동진;최학근
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.14 no.10
    • /
    • pp.1089-1095
    • /
    • 2003
  • In this paper, the 26 GHz band omnidirectional antenna that produces an isotropic radiation pattern in the azimuth plane and a directive radiation pattern in the elevation plane was designed by using reflector antennas. To investigate the reliability of the designed antenna, that was analyzed by using the aperture field method and the calculated value was compared with the measured value. An good agreement was achieved between the calculated characteristics and the experimental performance. We found that the designed antenna in this paper can be used as the omnidirectional antenna with reflectors and the analysis method in this paper can be used for the analysis of this type antenna.

The Structured Grid Calibration Based On Triangulation Method (삼각법을 기반으로 한 구조화된 격자 캘리브레이션)

  • KIM EUN-SEOK;JOO KI-SEE;WANG GI-NAM
    • Proceedings of the Korean Operations and Management Science Society Conference
    • /
    • 2002.05a
    • /
    • pp.248-252
    • /
    • 2002
  • Many sensors such as a structured grid pattern generator, a laser, and CCD camera to information have been used, but most of algorithms for a calibration are inefficient memory and experiment data are required. In this paper, the calibration algorithm of a structured grid pattern based on triang is introduced to calculate 3D information in the real world. The beams generated from str pattern generator established horizontally with the CCD camera are projected on the calibn CCD camera observes the intersection plane of a light and an object plane. The 3D infon calculated using observed and calibration data. This proposed method in this paper has advantages such as a memory saving and an experimental data since the 3D information are obtained simply triangulation method.

  • PDF

Binary Nature Revealed in Circumstellar Spiral-Shell Patterns

  • Kim, Hyosun;Hsieh, I-Ta;Liu, Sheng-Yuan;Taam, Ronald E.
    • The Bulletin of The Korean Astronomical Society
    • /
    • v.39 no.1
    • /
    • pp.56.1-56.1
    • /
    • 2014
  • With the advent of high-resolution high-sensitivity observations, spiral patterns have been revealed around several asymptotic giant branch (AGB) stars. Such patterns can provide possible evidence for the existence of central binary stars embedded in outflowing circumstellar envelopes. It is, however, not generally recognized that the binary induced pattern, vertically extended from the orbital plane, exhibits a ring-like pattern with an inclined viewing angle. I will first review the binary-induced spiral-shell patterns on the AGB circumstellar envelopes with the effect of inclination angle with respect to the orbital plane, of which large inclination cases reveal incomplete ring-like patterns. I will describe a method of extracting such spiral-shell from the gas kinematics of an incomplete ring-like pattern to place constraints on the characteristics of the (unknown) central binary stars. This first success may open the possibility of connecting the ring-like patterns commonly found in the AGB circumstellar envelopes and in the outer parts of (pre-)planetary nebulae and pointing to the conceivable presence of central binary systems, which may give a clue for the onset of asymmetrical planetary nebulae.

  • PDF

An Omnidirectional Antenna for REID UHF Band Tag (UHF대역 RFID 태그용 전방향성 안테나)

  • Son, Tae-Ho
    • Journal of the Korea Academia-Industrial cooperation Society
    • /
    • v.7 no.2
    • /
    • pp.145-149
    • /
    • 2006
  • UHF band omnidirectional antennas for RFID tag were designed. Crossed loaded dipole and bended dipole were applied to be designed for both miniaturization and omnidirectional radiation pattern. By suppling 90 degrees phase difference between crossed dipoles, omnidirectional E-plane patterns can be obtained. -10 dB reflection coefficients of 3 types dipole antenna which have designed under conjugate matched with input impedance of chip were shown as 670-1,050 MHz, 700-1,250 MHz and 600-1,020 MHz, respectively, and also shown that all antenna have omnidirectional radiation pattern both E and H plane.

  • PDF

The effect of depth discontinuity on spreading of motion aftereffect to non-adapted area (비순응 영역으로의 운동 잔여효과의 번짐에 미치는 삼차원 깊이 불연속의 효과)

  • Kham, Kee-Taek
    • Korean Journal of Cognitive Science
    • /
    • v.21 no.1
    • /
    • pp.1-24
    • /
    • 2010
  • The stationary image appears to move after we view a moving stimulus for a long time. The motion aftereffect(MAE) can spread to an adjacent region if there is no contrast discontinuity between two regions. In this study, it is investigated whether a phenomenon of MAE spreading to an adjacent non adapting area is affected by the depth discontinuity defined by binocular disparity. In the first experiment a disparity defined slanted pattern was presented in an unadapted region, and in the second experiment, a disparity defined pattern with a different depth was presented on the fronto-parallel plane. Although MAE duration in the condition with slanted pattern was not different from that in the non-slanted pattern condition, MAE durations in the pattern presented on pronto-parallel plane was vividly reduced, but not completely disappeared. These results suggest that a phenomenon of MAE spreading might be affected by depth discontinuity, and could be occurred after binocular information converges.

  • PDF

Quantitative Determination of Out-of-plane Displacement by Shearography (Shearography의 1차도함수로부터 면외변위의 정량적 추출)

  • Kim, Koung-Suk;Yoon, Hong-Seok;Park, Chan-Ju;Choi, Jung-Suk
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.772-776
    • /
    • 2004
  • The paper describes the quantitative determination of out-of-plane displacement from result of Shearogrpahy, which can measure the first-order partial derivative of out-of-plane displacement directly. However, the differential sensitivity of Shearography is related to the amount of shearing, which is manually adjustable in optical interferometer and affects the quantitative determination. The relationship between those is inspected by comparing ESPI with Shearography. From the result, the amount of shearing plays a modulation factor of out-of-plane displacement and small amount of shearing gives good agreement with out-of-plane displacement.

  • PDF

The Design of a Wideband E-plane Phased Array Antenna using W/G Simulator (도파관 시뮬레이터를 이용한 광대역 E-평면 넛치 위상 배열 안테나 설계)

  • 김준연;소준호;임중수
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
    • /
    • v.14 no.2
    • /
    • pp.111-118
    • /
    • 2003
  • Notch Antenna is a travelling wave type antenna and can provide multioctave operation in phased arrays that scan over wide angle. In this paper, we designed a wideband E-plane phased array antenna using E-plane waveguide simulator which has a bandwidth of 3 : 1 and a scan volume of $\pm$45$^{\circ}$ in E-plane. We compared impedance of single antenna and infinite array antenna using equivalent circuit modeling. We analyzed full structure of 1$\times$9 phased array antenna and we evaluated active reflection coefficient with variation of beam scan angle through mutual coupling coefficient acquired from simulation and investigated the variation of antenna gain with variation of active element pattern as beam scan angle is varied.

Modeling of unreinforced brick walls under in-plane shear & compression loading

  • Kalali, Arsalan;Kabir, Mohammad Zaman
    • Structural Engineering and Mechanics
    • /
    • v.36 no.3
    • /
    • pp.247-278
    • /
    • 2010
  • The study of the seismic vulnerability of masonry buildings requires structural properties of walls such as stiffness, ultimate load capacity, etc. In this article, a method is suggested for modeling the masonry walls under in-plane loading. At the outset, a set of analytical equations was established for determining the elastic properties of an equivalent homogeneous material of masonry. The results for homogenized unreinforced brick walls through detailed modeling were compared in different manners such as solid and perforated walls, in-plane and out-of-plane loading, etc, and it was found that this method provides suitable accuracy in estimation of the wall linear properties. Furthermore, comparison of the results of proposed modeling with experimental out coming indicated that this model considers the non linear properties of the wall such as failure pattern, performance curve and ultimate strength, and would be appropriate to establish a parametric study on those prone factors. The proposed model is complicated; therefore, efforts need to be made in order to overcome the convergency problems which will be included in this study. The nonlinear model is basically semi-macro but through a series of actions, it can be simplified to a macro model.

THE STUDY OF THE ERUPTION PATTERN OF THE MAXILLARY FIRST PERMANENT MOLAR (상악(上顎) 제1대구치(第一大臼齒)의 맹출과정(萌出過程)에 관(關)한 연구(硏究))

  • Kim, Hyun-Kyu
    • Journal of the korean academy of Pediatric Dentistry
    • /
    • v.11 no.1
    • /
    • pp.13-24
    • /
    • 1984
  • To Study the eruption pattern of the maxillary first permanent molar, the author took 266 cases of true lateral cephalogram (Male; 137 cases, Female; 129 cases) from 3 to 7 years old children and observed the vertical change and axial change. The following results were obtained: 1. The angle of axial inclination of the maxillary first permanent molar to the F-H plane increased gradually from age 3 to 7, except for age 6 in both sexes. There was a slight reversal of this motion at age 6. 2. The distance from the cusp of the maxillary first permanent molar to the occlusal plane slightly decreased from age 3 to 5, and rapidly decreased from age 5 in both sexes. 3. The change of angle of the axial inclination resulted in the distance from the distobuccal cusp of the maxillary first permanent molar to the occlusal plane decreasing more than that from the mesiobuccal cusp of the maxillary first permanent molar to the occlusal plane in both sexes. 4. The eruption of the maxillary first permanent molar generally was found to be earlier in girls than boys.

  • PDF

A study on the measurement of two-dimensional in-plane displacements of the plate with a circular hole by ESPI method (ESPI에 의한 원공판의 2차원 면내변위 측정에 관한 연구)

  • Kim, Kyoung Suk;Choi, Hyoung Chol;Yang, Seung Pil;Kim, Hyoung Soo;Hong, M.S.;Jung, W.K.
    • Journal of the Korean Society for Precision Engineering
    • /
    • v.11 no.5
    • /
    • pp.161-170
    • /
    • 1994
  • This paper presents the performance and problems in analysis method and testing system of Electronic Speckle Pattern Interfermetry(ESPI) method, in measuring two-dimensional in- plane displacement. The analysis result of measurement by ESPI is quite comparable to that of measurement by strain gauge method. This implieds that the method of ESPI is a very effective tool in non-contact two-dimensional in-plane strain analysis. But there is a controversial point, measurement error. This error is discussed to be affected not by ESPI method itself, but by its analysis scheme of the interference fringe, where the first-order interpolation has been applied to the points of strain measured. Further development of advanced first-order interpolation method is being undertaken for the more precise in-plane strain measurement.

  • PDF