• Title/Summary/Keyword: Transition Structure

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High-Q Resonator with Substrate Integrated Waveguide(SIW) Structure (높은 Q 값을 갖는 기판 집적형 도파관(SIW) 공진기)

  • Yun Tae-Soon;Nam Hee;Lee Jong-Chul
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.17 no.4 s.107
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    • pp.324-329
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    • 2006
  • In this paper, a resonator with the substrate integrated waveguide(SIW) structure at the satellite communication band is presented. The SIW structure is realized by via-holes on the dielectric substrate and has an advantage of integration with other circuits. For the measurement, a designed back-to-back transition has the insertion loss of 0.4 dB at 18 GHz. Also, the quality factor of the resonator with the SIW structure including back-to-back transition is obtained to be 222. The high-Q resonator with the SIW structure can be used in filter, oscillator, and voltage controlled oscillator.

A Study on the Transitional Patterns of Main Streets in Tokyo (동경중심부에 있어서 대가로형성과정에 관한 연구)

  • ;Kumagai, Yoichi
    • Journal of the Korean Institute of Landscape Architecture
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    • v.20 no.2
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    • pp.43-61
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    • 1992
  • Recently, people in urban areas ask for the creation of space for amenity and improvement of environmental problems, in such a condition the activation and reformation of city have become an important subject. The basic element of a city structure is the street. Therefore in this study, a transition of street spaces of a city was investigated. This study will be a basis for the planning of urban space in order to realize a comfortable and fascination urban life. In this paper, the study areas chosen were "Ginza", "Kyobashicho", "Nihonbashicho", "Honcho", "Tsukizi", "Hatchoboricho", "Ningyocho", "Ningyocho" which are the central places and business areas of capital Tokyo of Japan. The main streets were chosen for investigative subjects because they were planned as making a division of block in a city planning. Using maps and references the data was illustrated and the investigation was focused on the period from the Edo era to present time. (1) A periodical division for the basis of a street transition. (2) Consideration of methods in a plan and design for street spaces in each period. (3) A special feature and process of a street transition in each period. (4) A structure of a street and a construction form. (5) A classified structure of streets. (6) A process of a transition for each street.

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Construct Validity of the Life Transition Scale for Parents of Children with Autism (자폐성장애 아동 부모의 삶의 전환과정 측정도구에 대한 구성타당도 평가)

  • Lee, Ae Ran;Hong, Sun Woo;Ju, Se Jin
    • Journal of Korean Academy of Nursing
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    • v.44 no.5
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    • pp.563-572
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    • 2014
  • Purpose: The study was done to identify the construct validity and reliability of the life transition scale (LTS) for parents who have children with autism. Methods: Exploratory factor analysis (EFA) and confirmative factor analysis (CFA) were conducted to identify the most adequate measurement model for structural validity. Convergent validity and discriminant validity were also conducted for structural validity. Data were collected from 208 parents through self-reported questionnaires and analyzed with SPSS/WIN 15.0 and AMOS 20.0 version. Results: A four factor-structure was validated (${\chi}^2$=541.23, p<.001, GFI=.82, RMSEA=.07, IFI=.89, CFI=.89, PNFI=.73, Q (${\chi}^2/df$)=2.20) at the 3rd order of EFA and CFA, and factors were named as denying, wandering, despairing, and accepting. Both convergent and determinant validity for LTS were 100%. Cronbach's alphas for the reliability of each structure were .77-.90 and .83 for total structure. Conclusion: The four structures, 24-item instrument showed satisfactory reliability and validity. LTS has the potential to be appropriate for assessing the transition process of life for parents who have children with autism and provides basic directions for differentiated support and care at each stage.

A Study on the Rail Pone of Transition Curve Track to Speed Up of Tilting train (틸팅차량 완화곡선 증속 주행시 궤도작용력 검토)

  • Shin, Tae-Hyoung;Choi, Jung-Youl;Eum, Ki-Young;Park, Yong-Gul
    • Proceedings of the KSR Conference
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    • 2009.05a
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    • pp.529-538
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    • 2009
  • A trial run of locally-developed tilting train has been in process on Chungbuk line since the test vehicle was first produced. For the system stabilization, interface verification among the systems including track, structure, catenary and signaling system, not to mention the rolling stock, is very crucial. Therefore, in this study, the dynamic rail force of the tilting (Hanvit 200), high-speed (KTX) and general (Mugunghwa) vehicle caused by driving in transition curve track was measured. And, it compared the tilting response with the other by using the measured wheel load data in transition curve track, and then evaluated probability the range of wheel load fluctuation for the variable dynamic vertical and lateral wheel load. As a result, a range of wheel load by occured a change of cant from the high-speed and general vehicle which had fixed bogie structure was distributed throughout small deviation (${\Delta}8{\sim}13kN$). Otherwise, in case of the tilting train which was consisted of the pendulum bogie structure was distributed wide range about large deviation (${\Delta}25{\sim}28kN$) by changed of cant.

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Circularly Polarized Wave Generating Coaxial to Waveguide Transition for Horn Antenna (혼 안테나용 원형 편파 발생이 가능한 동축-도파관 변환 구조)

  • Lee, Kwang-Jae;Woo, Duk-Jae;Lee, Taek-Kyung;Lee, Jae-Wook
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.21 no.7
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    • pp.823-830
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    • 2010
  • This paper deals with a coaxial-to-waveguide transition generating circularly polarized wave to be connected with horn antennas. By combining vertical coaxial fed structure, back-short and the polarization twisting structure, the circular polarization is successfully generated in the waveguide. The designed and implemented transition shows that the present structure can significantly reduce the size of the antenna part at X-band.

Design of 200 GHz Waveguide to Microstrip Transition using Probe Structure (200 GHz 대역 프로브 구조의 구형도파관-마이크로스트립 변환기 설계)

  • Lee, Sang-Jin;Baek, Tae-Jong;Ko, Dong-Sik;Han, Min;Choi, Seok-Gyu;Kim, Jung-Il;Kim, Geun-Ju;Jeon, Seok-Gy;Yoon, Jin-Seob;Rhee, Jin-Koo
    • Journal of the Institute of Electronics Engineers of Korea TC
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    • v.49 no.4
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    • pp.47-52
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    • 2012
  • We have designed the waveguide to microstrip transition using a probe structure for the center frequency of 200 GHz transceiver. The waveguide to microstrip transition is composed of probe, taper and microstrip transmission line. For design of the transition, we simulated the lengths and width of the probe and the taper to optimize the center frequency and the bandwidth using HFSS simulation tool from Ansoft. The transition is designed back-to-back structure. From the simulation results, the transition exhibits that insertion loss is below - 0.81 dB and the return loss less than -10 dB in range of 186 ~ 210 GHz.

Soft Morphing Motion of Flytrap Robot Using Bending Propagating Actuation (밴딩 전파 구동을 이용한 파리지옥 로봇의 소프트 모핑 동작)

  • Kim, Seung-Won;Koh, Je-Sung;Cho, Maeng-Hyo;Cho, Kyu-Jin
    • Journal of Institute of Control, Robotics and Systems
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    • v.18 no.3
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    • pp.168-174
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    • 2012
  • This paper presents a bending propagating actuation using SMA (Shape Memory Alloy) spring for an effective shape transition of a flytrap-inspired soft morphing structure. The flytrap-inspired soft morphing structure is made from unsymmetric CFRP (Carbon Fiber Reinforced Prepreg) structure which shows bi-stability and snap-through phenomenon. For a thin and large curved bistable CFRP structure, SMA spring is more acceptable than SMA wire and piezoelectric actuator which used in previous investigations. A bending propagating actuation is proposed which can induce snap-through of the bi-stable CFRP structure effectively. From this research, effective shape transition of soft morphing structure is possible.

Synthesis and Temperature-Dependent Local Structural Properties of Ti2O3

  • Hwang, Inhui;Jin, Zhenlan;Park, Changin;Jiang, Bingzhi;Han, S.W.
    • Proceedings of the Korean Vacuum Society Conference
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    • 2013.08a
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    • pp.202.2-202.2
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    • 2013
  • Ti2O3 is known as a typical Mott insulator with a transition temperature of near $200^{\circ}C$. Unlike VO2, Ti2O3 does not have a structural phase transition near the metal-insulator-transition (MIT) temperature. We investigated the temperature-dependent thermal vibration change using temperature-dependent x-ray absorption fine structure (XAFS) at Ti K-edge in the temperature range of 300~600 K. Ti2O3 powder and films were synthesized using thermal chemical vapor deposition (CVD) at $800{\sim}900^{\circ}C$. X-ray diffraction measurements show a single phased Ti2O3 at room temperature. XAFS confirmed no structural phase transition in the temperature of 300~600 K. A small but distinguishable structural disorder change was observed near the transition temperature. We will discuss the MIT behavior with the change of structural disorder.

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Rectangular Waveguide-NRD Waveguide Transition having the NRD Waveguide Built-in Structure (NRD 도파관에 내장된 구조를 갖는 구형 도파관-NRD 도파관 트랜지션)

  • Yoo, Young-Geun;Choi, Jae-Ha
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.4
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    • pp.391-396
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    • 2008
  • In this paper, we proposed the new rectangular waveguide-NRD waveguide transition in which the transition function about the standard waveguide is built in within the NRD waveguide ifself. The newly proposed rectangular waveguide-NRD waveguide transition was realized use of NRD waveguide input/output side wall thickness and hole width. In the case of the wall thickness, it was nearly identical with the half of the NRD waveguide guide wavelength and the width of an hole was nearly coincide with the length of the long side of the standard waveguide connected with the NRD waveguide. This kind of the principles is applicable to be unrelated with the frequency band. In this paper, it made in 38 GHz band with the rectangular waveguide-NRD waveguide transition and the feasibility was confirmed. In the back-to-back structure, the rectangular waveguide-NRD waveguide transition manufactured in 38 GHz band has the insertion loss less than 0.4 dB and also has the return loss less than 20 dB.

A Study on a New Balun Structure with Vertically Periodic Defected Ground Structure (수직 결함 기저면 구조를 이용한 새로운 발룬 구조 연구)

  • Kim, Kwi-Soo;Kim, Chul-Soo;Song, In-Sang;Lim, Jong-Sik;Ahn, Dal
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.19 no.7
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    • pp.785-790
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    • 2008
  • In this paper, a new balun is proposed. This proposed balun has a DGS(Defected Ground Structure) pattern on the ground plane. The transmission-line is transformed by microstrip-to-slotline transition. DGS pattern on the ground plane and transition of the lines can be easily made a property of the balun. Resonance frequency of the DGS leads to operating frequency of the balun. Also the transition produces $180^{\circ}$ out-of-phase between two output ports without additional transmission line. In this paper, a new balun with VPDGS(Vertically Periodic Defected Ground Structure) effectively lower the operating frequency. To validate the proposed design method, the new balun is designed, fabricated and measured at 2 GHz.