• Title/Summary/Keyword: 역삼각형

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A Study on the Upright Control of an Inverted Triangle (역삼각형의 직립 제어에 관한 연구)

  • 오영석;유영호
    • Journal of Advanced Marine Engineering and Technology
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    • v.21 no.5
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    • pp.571-578
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    • 1997
  • This paper presents a method for designing a control system to stand upright inverted triangle. A linearized model is obtained form the nonlinear system by Taylor series expansion and a state controller is designed based on the model. After implementing the control system which is combined control law and estimator with reference input, experiments are carried out to stand upright inverted triangle at any angluar position.

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An Analysis of Pedestrians' Speed according to Pedestrian Countdown Signal Systems (보행신호 잔여시간 표시장치에 따른 보행속도 분석)

  • Jang, Myeong-Sun;Im, Sam-Jin;Kim, Gyeong-Hui
    • Journal of Korean Society of Transportation
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    • v.24 no.4 s.90
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    • pp.43-53
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    • 2006
  • Pedestrian countdown signals were newly introduced to make Pedestrians feel more comfortable and safer in crossing the streets This Paper analysed pedestrian walking-speed through a before-after behavior study Data was collected from 22 sites. and the total number of pedestrians was 19,800. The results showed that the average Pedestrian walking-speed of existing pedestrian signal, an inverted triangle countdown signal and a numeric countdown signal were 1.44, 1.39 and 1.42m/sec. The difference between the three methods was statistically significant. The results showed that the distribution of the walking-speed of existing signal. an inverted triangle countdown signal and a numeric countdown signal were statistically Erlang(0.117, 10) distribution. Weibull(1.17, 3.72) distribution and Gamma(0.137, 8.18) distribution at 95% confidence level.

Numerical Reproducibility of Wave Response for an Oscillating Wave Surge Converter Using Inverted Triangle Flap (역삼각형 플랩을 이용한 진자형 파력발전장치의 파랑응답에 대한 수치적 재현 가능성)

  • Kim, Tag-Gyeom;Kim, Do-Sam;Cho, Yong-Hwan;Lee, Kwang-Ho
    • Journal of Korean Society of Coastal and Ocean Engineers
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    • v.33 no.5
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    • pp.203-216
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    • 2021
  • Analyzing various wave interactions with oscillating wave surge converters (OWSC) is essential because they must be operated efficiently under a wide range of wave conditions and designed to extract optimal wave energy. In the conceptual design and development stage of OWSC, numerical analysis can be a good alternative as a design tool. This study performed a numerical analysis on the behavioral characteristics of the inverted triangle flap against the incident waves using open source CFD to examine the essential behavioral attributes of OWSC. Specifically, the behavioral characteristics of the structure were studied by calculating the free water surface displacement and the flap rotation angle near the inverted triangular flap according to the change of the period under the regular wave conditions. By comparing and examining the numerical analysis results with the hydraulic model experiments, the validity of the analysis performed and the applicability in analyzing the wave-structure interactions related to OWSC was verified. The numerical analysis result confirmed that the hydrodynamic behavior characteristic due to the interactions of the wave and the inverted triangle flap was well reproduced.

Face Design of Korean Traditional Fashion Doll (한국 전통 패션인형 얼굴 디자인)

  • Hwang, Eui-Sook;Kim, Soh-Hyeon;Lee, Yoon-Joo;Chin, Son-Hei;Kim, Hye-Soo;Park, Sang-Hee
    • The Journal of the Korea Contents Association
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    • v.13 no.2
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    • pp.157-174
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    • 2013
  • This study aims to develop a proper face design for traditional fashion doll so that the Korean traditional doll can achieve its stand in the modern collection with the new face design based on researching documents, analyzing the examples and delivering a customer survey. The majority of dolls in traditional costume has an innocent look with inverted triangle shape face. But the inverted triangle or oval shape as well as the refined look of well balanced facial features are preferred. An oval face, elongated eyes with no double eyelid or inner double eyelid, plump lips and round and high nose are considered beautiful in the traditional figure. Based on this result, a new design is configured with an inverted triangular face with slightly plump cheeks, eyes with reduced eye, pupil and double eyelid, round nose without tuning up and small and full lower lip.

A Study on Inverted Triangle Structural Planar Monopole Antenna with Edge (에지를 가진 역삼각형 구조 평면 모노폴 안테나에 대한 연구)

  • Choi, Hong-Ju;Lee, Yun-Min;Oh, Kyu-Jong
    • Journal of Advanced Navigation Technology
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    • v.15 no.4
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    • pp.549-555
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    • 2011
  • In this paper, inverted triangle structural planar monopole antenna with Edge for UWB Communication (3.1 ~ 10.6 GHz) is presented. The antenna have broadband property structurally through inverted triangle structural planar monopole which have edge. Monopole and ground of proposed antenna exist on coplanar plane, and excite as CPW. It used FR4 dielectric substrate of ${\epsilon}_r=4.4$, and the size is $20{\times}20{\times}1.6mm$. Return loss is more than - 10dB in 3.1 ~ 10.1 GHz (7.0 GHz). Radiation pattern is about the same that of dipole antenna at all frequency. At measured result, max gain is 8.44 dBi at E - plane.

Study on the Composite Capacity of Composite Slabs by Deckplate Section Shapes (데크플레이트 단면형상에 따른 합성슬래브의 합성능력에 관한 연구)

  • Ju, Gi-Su;Park, Sung-Moo
    • Journal of Korean Society of Steel Construction
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    • v.12 no.6
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    • pp.671-680
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    • 2000
  • This paper provides the results of the study on the structural behavior of the composite metal deck slab system. The experimental study on composite slabs with trapezoidal and inverse-triangle-top-flange deckplate result, it was found that the geometry of the cross-section was more important than any other factors to ensure the composite action of deck slabs. Hence the inverse-triangle-top-flange of closed box was more effective on the shear slip and deflection than the trapezoidal deck of open shape. These results show that the continuing development of composite deck plate must consider importantly the geometry of the deck. The experimental results were compared with established formulas and were analysed to advance a theory on composite slabs using deckplates.

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A Study of the Flower-Shaped Silver Crown Ornament and Inverted Triangle-Shaped Crown Ornament of Baekje During the Sabi Period (백제 사비기 은화관식과 역삼각형 관식에 관한 연구)

  • Jun-Hee Kweon
    • Journal of the Korean Society of Clothing and Textiles
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    • v.47 no.2
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    • pp.392-408
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    • 2023
  • This study concerns the flower-shaped silver crown ornament and inverted triangle-shaped crown ornament of Baekje, which were worn frequently during the Sabi period. The purpose of this study is to present a new estimated shape of the crown and ornaments. Individual excavation cases and archaeological data were analyzed. The flower-shaped silver crown ornament appears as a thin silver plate with buds on the center and side branches and is symmetrically bent from the center to form a ∧ shape. The inverted triangle-shaped crown ornament resembles two right-angle triangles that are back-to-back. The crown to which the two ornaments were added appears to be a triangular crown that was made by covering birch bark of with fabric. Both ornaments were believed to have been located on the front of crown, but that is incorrect. The flower-shaped silver crown ornament was inserted on the front of the crown, and the inverted triangle-shaped crown ornament was fixed with a tip at the top of the crown and then obliquely on the crown's side. The inferred design was confirmed with real reproductions. This study is significant in that it identifies the crown of Baekje during the Sabi period.

Design and Implementation of 2.4/5 GHz Dual-Band Plate Type Antenna for Access Point of Wireless LAN (2.4/5 GHz 무선 LAN 액세스 포민트용 이중 공진 판형 안테나 설계 및 구현)

  • Lee Won-Kew;Son Ji-Myoung;Han Jun-Hee;Yang Woon-Geun
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.5 s.108
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    • pp.401-407
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    • 2006
  • In this paper, we present a small-sized and light weighted dual-band antenna for an access point of 2.4/5 GHz dual-band WLAN(Wireless Local Area Network). The antenna for WLAN should show the characteristic of omni-directional radiation pattern. First, to obtain the omni-directional radiation pattern the proposed dual-band antenna has an orthogonal inverted triangular type element at the center and locates four resonating elements symmetrically around it. Also, for the purpose of easy manufacturing and miniaturization of the antenna, we changed the central element which had the orthogonal inverted triangular type structure into the plate type. Measured $S_{11}$ for the proposed dual-band plate type antenna showed characteristic which was less then -12.8 dB for WLAN frequency bands. Measured results for the maximum gain showed 3.17 dBi at 2.44 GHz, 5.38 dBi at 5.77 GHz with omni-directional radiation pattern. The implemented antennas showed applicable performances for the access point of WLAN.

Microstructural Observations on Quaternary ZnMgSSe/GaAs Epilayer Grown by MBE (MBE로 성장시킨 4원계 ZnMgSSe/GaAs 에피층의 미세구조 관찰)

  • Lee, Hwack-Joo;Ryu, Hyun;Park, Hae-Sung;Kim, Tae-Il
    • Applied Microscopy
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    • v.25 no.3
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    • pp.82-89
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    • 1995
  • High resolution transmission electron microscopic observations on quaternary $Zn_{1-x}Mg_{x}S_y$ $S_{1-y}$(x=0.13, y=0.16) on (001) GaAs substrate grown up to $1.2{\mu}m$ with 20nm ZnSe buffer layer at $300^{\circ}C$ by RIBER MBE system which has a single growth chamber were investigated by HRTEM working at 300kV with point resolution of 0.18nm. The ZnSe buffer layer maintains the coherency with the GaAs substrate. The stacking faults had begun at ZnSe buffer/$Zn_{1-x}Mg_{x}S_{y}S_{1-y}$ interface, whose length and spacing became larger than 60nm and wider than 40nm, respectively. The inverse triangular stacking fault was bounded by stacking faults which were formed on {111} planes with different variants. There exists rare stacking faults inside the triangular defect. The epilayer surrounded by the straight stacking faults, which had formed in the same direction, became the columnar structure.

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A Design of Inverted-Triangle UWB Monopole Antenna with Band Rejection Slot (대역 저지 슬롯이 추가된 역삼각형 모노폴 UWB 안테나의 설계)

  • Choi, Hyung-Seok;Choi, Kyoung;Hwang, Hee-Yong
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.22 no.5
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    • pp.516-521
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    • 2011
  • In this paper, an inverted-triangle patch UWB antenna with an uneven ground planes and an inverted T-slot for 5 GHz WLAN band rejection is presented. The operating bandwidth of the proposed antenna fed with the CPW line is expanded from 3.1 GHz to 10.6 GHz for about -10 dB return loss using three angular parameters correlated to the main patch and the ground plane. The fabricated antenna on Taconic RF-60A substrate with 6.16 relative dielectric constant and 0.64 mm thickness has a main antenna patch size of 36 mm${\times}$19.5 mm. The measured results show return losses of about -10 dB and nearly omni-directional radiation patterns. The proposed UWB antenna has advantages of easily adjustable impedance characteristics by the three angular parameters and easily accomplishable band rejection characteristics by the inverted T-slot.