• 제목/요약/키워드: Coupler system

검색결과 260건 처리시간 0.026초

전자파차폐효과 측정시스템의 구현 (Establishment of the Electromagnetic Shielding Effectiveness Measurement System)

  • 정연춘;강태원;정낙삼
    • 한국전자파학회지:전자파기술
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    • 제4권3호
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    • pp.45-53
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    • 1993
  • 재료의 전자파차폐효과는 일정한 송신전력에 대해 측정치구 내에 차폐재료가 놓여 있을 때와 없을 때에 수신 되는 수신전력의 차를 측정하므로써 결정된다. 구현된 전자파차폐효과 측정시스댐은 다양한 측정치구를 이용하고, 트랙킹신호원, 스펙트럼분석기, 스텝감쇠기, 고주파스위치, 신호증폭기 동을 사용하였으며, 퍼스날컴퓨터에 의해 측정이 자동으로 이루어지도록 설계되었다. 특히 고주파스위치와 쌍방향성결합기를 이용하여 한대의 스펙트럼분석기를 사용하여 입사전력, 반사전력, 투과전력을 측정할 수 있어 재료의 전자파차폐효과 측정은 물론, 차폐 특성에 관한 분석도 가능하여 재료의 설계에도 활용될 수 있다. 구현된 측정시스댐은 10 MHz~1 G GHz의 주파수대역에서 120 dB 이상의 동작영역을 가지며, 각종의 복합재료의 전자파차폐효과를 효과적으로 측정할 수 있다.

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트랙터-트레일러형 차량 시스템의 주행 충격진동 특성에 관한 연구 (A study on the shock & vibration characteristics of a tractor-trailer type vehicle system running on the road)

  • 김종길
    • 한국군사과학기술학회지
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    • 제4권1호
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    • pp.13-19
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    • 2001
  • It is known that displacements, velocities and accelerations of the tractor- trailer type vehicle system in shock & vibration analysis by the flexible-multi-body dynamics including the flexibility of structure are bigger and more repetitive than them by the rigid-multi-body dynamics, and it is necessary to prove above results by the experimental field test. Therefore, in this paper, theoretical analysis by the flexible-multi-body dynamics and experimental field test for a tractor-trailer type vehicle system are conducted and their results are compared with each other. Because of unexpected metal contact and impact in the air coupler part in the field test, some accelerations measured from the experimental field test are bigger than them analyzed from the theoretical analysis, but most accelerations are well coincide with each other in the amplitudes and trends. Thus more refined dynamic analytical models for some special type vehicle systems will be possible in the future.

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농작물 재배 자동화를 위한 제어시스템 설계에 관한 연구 (A Study on Control system design for Automated Cultivation of product)

  • 조영석
    • 디지털산업정보학회논문지
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    • 제10권1호
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    • pp.55-60
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    • 2014
  • Today, there is increasing the elderly population in rural community, and people of returning from the urban to the rural community are demand to be of high value-added agriculture. In this time, there are required to regularization, standardization, automation, for getting of production of high value crops. In this paper, we are study for automation cultivation control system design for produce high-value crops. this system were designed of two parts that one part is measure and control unit, another part is server part for database and server side control. the main controller for measurement and control is used MC9S08AW60, server for Database and server-side control was using MySQL with CentOS. The source code of control program was coding C and compile with GCC. the functions of measurement and control unit are digital input and output each 8channels and can be scan-able of 20 Bit with 2CH/Sec. Analog Output were designed that can be output of 4-20mA or 0-5V on 4channel. The Digital input and output part were designed 8-channel, and using the high speed photo coupler and relays. We showed that system is possible to measure a 20bit data width, 2Ch/sec as 8 channel analog signals.

Active GNSS Antenna Implemented with Two-Stage LNA on High Permittivity Substrate

  • Go, Jong-Gyu;Chung, Jae-Young
    • Journal of Electrical Engineering and Technology
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    • 제13권5호
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    • pp.2004-2010
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    • 2018
  • We propose a small active antenna to receive Global Navigation Satellite System (GNSS) signals, i.e., Global Positioning System (GPS) L1 (1,575MHz) and Russian Global Navigation Satellite System (GLONASS) L1 (1,600 MHz) signals. A two-stage low-noise amplifier (LNA) with more than 27 dB gain is implemented in the bottom layer of a three-layer antenna package. In addition, a hybrid coupler is used to combine signals from pair of proximately coupled orthogonal feeds with $90^{\circ}$ phase difference to achieve the circular polarization (CP) characteristic. Three layers of high permittivity (${\varepsilon}_r=10$) substrates are stacked and effectively integrated to have a small dimension of $64mm{\times}64mm{\times}7.42mm$ (including both circuit and antenna). The reflection coefficient of the fabricated antenna at the target frequency is below -10 dB, the measured antenna gain is above 26 dBic and the measured noise figure is less than 1.4 dB.

Fiber-optic humidity sensor system for the monitoring and detection of coolant leakage in nuclear power plants

  • Kim, Hye Jin;Shin, Hyun Young;Pyeon, Cheol Ho;Kim, Sin;Lee, Bongsoo
    • Nuclear Engineering and Technology
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    • 제52권8호
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    • pp.1689-1696
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    • 2020
  • In this study, we developed a fiber-optic humidity sensor (FOHS) system for the monitoring and detection of coolant leakage in nuclear power plants. The FOHS system includes an FOHS, a spectrometer, a halogen white-light source, and a Y-coupler. The FOHS is composed of a humidity-sensing material, a metal tube, a multi-mode plastic optical fiber, and a subminiature version A (SMA) fiber-optic connector. The humidity-sensing material is synthesized from a mixture of polyvinylidene fluoride (PVDF) in dimethyl sulfoxide (DMSO) and hydroxyethyl cellulose (HEC) in distilled water. We measured the optical intensity of the light signals reflected from the FOHS placed inside the humidity chamber with relative humidity (RH) variation from 40 to 95%. We found that the optical intensity of the sensing probe increased linearly with the RH. The reversibility and reproducibility of the FOHS were also evaluated.

장수명 공동주택용 보-기둥 접합부 시공방법 개발 (Development of Beam-Column Connection for The New Apartment Structural System)

  • 윤태호;홍원기;김선국;박선치;윤대영
    • KIEAE Journal
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    • 제10권6호
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    • pp.145-151
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    • 2010
  • Bearing wall system was used extensively in most multi-residential apartment buildings in Korea. However, bearing wall apartments have the lack of architectural plan flexibility, remodelling-incompatible, causing serious economic losses in terms of construction waste. Recently, many researchers have studied the use of Rahmen structure as a potential alternative. The beam-column connection in the paper for long-life apartment housing forms connection of a Rahmen structure utilizing the advantages of steel and reinforced concrete. In addition, reduction of cast-in place concrete and construction schedule is expected by using precast concrete. Reduction effect of quantity decreased construction costs and $CO_2$ emission of key construction materials. However, verifying the feasibility of new construction method entails numerous challenges. Accordingly, the purpose of this study is to analyze the construction feasibility of sleeve, coupler, and pressure welding connections for long-life apartment building structure. A 3D modeling software was used to perform the analysis, and a real scale model was created to verify the results of construction feasibility. By verifying the construction feasibility of beam-column connections, this study will contribute to the efficient application of these methods on construction sites.

코히어런트 PON시스템의 I/Q 진폭불균형 분석 및 보상 (Analysis and Compensation of I/Q Amplitude Imbalance In Coherent PON Systems)

  • 김나영;이승우;박영일
    • 한국통신학회논문지
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    • 제40권10호
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    • pp.1940-1946
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    • 2015
  • 차세대 광가입자망시스템에서는 전송속도 및 전송거리 향상을 위해 코히어런트 광전송 시스템이 검토되고 있다. 그런데 이 전송방식의 경우 I/Q 불균형 요인에 의해 전송 성능 저하를 일으킬 수 있으며, 가입자 수신부 내부 구조의 비대칭성은 I/Q 진폭불균형의 주 요인이 될 수 있다. 따라서 안정적인 전송 성능 보장을 위해서는 이런 불균형 성분을 제거하거나 보상해주어야 한다. 본 논문에서는 I/Q 진폭불균형의 원인 및 전송 성능에 미치는 영향을 분석하고, 수신부에서 발생하는 I/Q 진폭불균형 요인을 보상하는 방식을 제시하였다. 또한 시뮬레이션을 통해 제안한 방식의 성능을 보인다.

커플러를 갖는 프리스트레스트 콘크리트 구조물의 응력분포에 관한 실험연구 (An Experimental Study on Stress Distribution of Prestressed Concrete Structure with Coupler System)

  • 오병환;이영우;채성태
    • 한국콘크리트학회:학술대회논문집
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    • 한국콘크리트학회 1999년도 학회창립 10주년 기념 1999년도 가을 학술발표회 논문집
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    • pp.561-564
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    • 1999
  • The uniform state of prestress in a fully prestressed concrete members shows reductions of more than half of the initial prestress in the construction and coupling joint vicinity. Especially, at a zone x/d=0.2 above the construction joint where at the edge of the member, a quite localized reduced stress state of 1/3 of uniform stress is encountered. Five full-scale test specimens were segmentally constructed and post-tensioned and analytic models is used to verify and validate measured test results. The encountered highly nonuniform stress/strain state in the coupling joint vicinity requires special design consideration for the successful application of tendon couplers.

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전기자동차 충전스탠드의 제어파일럿 신호를 이용한 대역 내 통신 방식 (Inband Signaling on the Control Pilot of Electric Vehicle Supply Equipment)

  • 김철우;김상범;임유석
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.2019-2020
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    • 2011
  • Electric Vehicle Supply Equipment(EVSE) is a system or an equipment to supply electric power for charging the traction batteries on the electric vehicle. Control Pilot is an electric signal generated by EVSE and is transmitted to the electric vehicle by a vehicle coupler and a contact. The duty cycle of control pilot determines the maximum current to be drawn by electric vehicle. When the duty cycle is 5%, it is indicated that digital communication is needed. This paper deals with the data format and definition about communication scheduling through the inband signal on the control pilot of EVSE.

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고압 배전선로를 이용한 고속 전력선 통신 가입자망 구축 연구 (Field Trial of Power Line Communication Access Network over Medium Voltage Power Distribution Grid)

  • 이재조;오휘명;박영진;김관호;이대영
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2005년도 제36회 하계학술대회 논문집 D
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    • pp.3040-3042
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    • 2005
  • During the last several years, interest in broad-band power line communications (PLC) has been grown over medium voltage(MV) power distribution lines as well as low voltage lines. This paper introduces a medium voltage PLC test field that is set up in the suburbs of Euiwang city in Korea. This test field could be used not only for the measurement of communication channel environment but also for internet service. This paper shows the configuration of medium voltage test field with network devices like MV signal coupler and the results of channel environment like noise and impulse response. It also shows the service performance of PLC access network through network management system.

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