• Title/Summary/Keyword: 지그

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Structural Optimization of Turnover Jig of Cylinder Frame for Medium-speed Diesel Engine (중형엔진 실린더 프레임 턴오버용 지그의 구조 최적화)

  • Lee, Jong-Hwan;Son, Jung-Ho
    • Proceedings of the Korean Society of Marine Engineers Conference
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    • 2006.06a
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    • pp.31-32
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    • 2006
  • 본 논문은 중형엔진 조립과정에서 실린더 프레임 회전 작업에 사용하는 지그의 구조해석을 수행한 후, 지그의 안전성을 검토하고 지그의 경량화를 통하여 실용적인 지그 설계안을 제안하였다. 현장 작업자가 들 수 있는 최대 무게를 넘는 지그를 구조해석 모델로 선정한 후, 해석모델은 지그, 실린더 프레임, 볼트, 너트, 샤클 핀을 3차원 입체요소로 구성하고 ABAQUS/Standard를 사용하여 재료 비선형 및 접촉을 고려한 구조해석을 수행하였다. 구조최적화를 위하여 응력이 상대적으로 낮은 부위와 작업성을 고려하여 설계변수를 선정하고, 실험계획법의 직교배열표를 활용하여 설계변수에 대한 각 부위의 민감도와 경량화 모델을 도출하였다.

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지그비 제품.기술 상용화 '눈앞'

  • Park, Yeong-Ju
    • 정보화사회
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    • s.183
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    • pp.56-58
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    • 2006
  • 지그비 얼라이언스(ZigBee Alliance)가 9월 28일 서울 메리어트 호텔에서 '지그비 얼라이언스 오픈 하우스'를 갖고, 그 동안의 지그비 개발 성과를 발표했다. 이 자리에서는 지그비 관련 플랫폼이나 단말 개발 동향이 소개됐으며, 아울러 5층에서는 관련 업체들의 제품 전시가 이뤄졌다. 별도 마련된 전시장에는 국내 코윈(Korwin)과 레이디오펄스.TSC 시스템즈.TTA 외 프리스케일.엠버.TI.ST마이크로.텍트로닉스.오키.마이크로칩.크로스보우.Atmel 등 20개사가 참여했다.

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Optimization of Flask Fixtures for Marine Propellers Castings (선박용 프로펠러 주조시 주형 지그 최적화)

  • Park, Sang-Chul
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.8
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    • pp.3334-3338
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    • 2012
  • This work has been performed to evaluate the strength of fixtures, which were attached to outer surface of propeller flask to prevent transient movement during filling and cooling stages at Ni-Al-Bronze casting of large marine propellers. Experimental work was carried out to evaluate forces exerted on flask fixtures by measuring strain changes of fixtures due to thermal expansion and contraction during casting processes. Numerical analyses were also made to verify the experimental results and finally to evaluate the validity of arrangement of flask fixtures for casting of marine propellers.

Zigbee Adaptor for Two-way Data/Event/Service Interoperation in Internet of Things (사물인터넷의 양방향 데이터/이벤트/서비스 연동을 위한 지그비 어댑터)

  • Back, Moon-Ki;Yim, Hyung-Jun;Lee, Kyu-Chul
    • KIPS Transactions on Computer and Communication Systems
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    • v.3 no.4
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    • pp.107-114
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    • 2014
  • Things in the IoT(Internet of Things) make various services by exchanging information over networks. The IoT includes many types of WSNs(Wireless Sensor Networks) that consists of spatially distributed wireless sensor nodes and operates with the various purposes with useful technologies such as identification, sensing and communication. Typically, Zigbee network composed of low-cost and lowpower devices is mainly used for wide-area monitoring and remote device control systems. The IoT composed of various WSNs cannot interoperate among networks because of heterogeneous communication protocol and different data representation of each network, but can facilitate interconnection and information exchange among networks via the DDS, which is communication middleware standard that aims to enable real-time, high performance and interoperable data exchanges. In this paper, we proposed design of Zigbee Adaptor for two-way interoperation and data exchange between Zigbee network and other networks in the IoT. Zigbee Adaptor communicates with Zigbee network according to the Zigbee protocol and communicates with external networks via DDS. DDS-based Zigbee Adaptor can facilitate interoperation between a Zigbee network and external networks by systematic cooperation among its components.

An Efficient Channel Selection Algorithm of Zigbee in ISM Band (ISM-Band에서의 지그비의 효율적 채널선택기법)

  • Ryu, Je-Won;Choi, Young-Wan;Kwon, Young-Bin;Park, Jae-Hwa;Park, Ho-Hyun;Lee, Jeong-Woo
    • 한국정보통신설비학회:학술대회논문집
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    • 2008.08a
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    • pp.116-120
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    • 2008
  • The conventional channel selection method for a ZigBee communication network basically detects the energy values in all channels. In the ISM band, no license is required to use channels in this band, so there may exist various interference factors in this band. It is well known that WLAN is the major interference factor degrading the performance of ZigBee in the ISM band. In this paper, we propose an efficient channel selection algorithm which uses the pattern of WLAN channel uses as the a priori information. By using the proposed algorithm, we may save the time required to select channels for the ZigBee communications.

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Design and Structure Improvement of Jig Joint Area (지그접합부의 설계 및 구조개선)

  • Lee, Jong-Sun
    • Proceedings of the KAIS Fall Conference
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    • 2007.05a
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    • pp.242-244
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    • 2007
  • 본 논문에서는 바다나 강을 가로지르는 대교건설에 있어서 교각의 시공을 돕는 지그설치를 3차원으로 설계하여 시뮬레이션 해봄으로서 대교건설에 소요되는 시간 및 예산을 줄이는데 목적이 있다. 또한 지그의 간섭부위를 미리 예측함으로서 건설엔지니어링의 기술노하우를 강화하고자 한다.

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A Study on Implementation of Zigbee Module based on CC520 (CC2520 기반의 지그비 모듈 구현에 대한 연구)

  • Moon, Yong-Seon;Bae, Young-Chul;Roh, Sang-Hyun
    • The Journal of the Korea institute of electronic communication sciences
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    • v.5 no.6
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    • pp.664-671
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    • 2010
  • In this paper, we developed a Zigbee module based on CC2520 which is possible to construct the mesh network and also support to Zigbee Pro standard as a preceding research of autonomous moving of mobile robot using Zigbee. After manufacturing the Zigbee module, we selected antenna to fit Zigbee wireless frequency band using network analyze as means performance improvement. We also carry out an impedance matching of Zigbee module, extend the possible distance of two-way wireless communication and ensure the safety of communication.

Mobile Information System using Zigbee Technology (지그비를 이용한 모바일정보 시스템)

  • Park, Se Hyun;Ku, Kyo Min;Ha, Kyeoung-Ju
    • Journal of Korea Society of Industrial Information Systems
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    • v.19 no.2
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    • pp.67-72
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    • 2014
  • Zigbee is a wireless communication technology optimized for Wireless Sensor Network environment. Implementation of location estimation system is based on Zigbee. In this paper, we implement mobile information system using zigbee technology. The proposed system is composed of mobile terminal software and mobile reader softwrae. We also used our hardware in previous system.

Development of Jig System to Improve the Weldability of Vehicle Seat Frame (자동차용 시트프레임의 용접성 향상을 위한 지그 시스템 개발)

  • Shin, Yun-Ho;Jeon, Euy-Sik
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.8 no.2
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    • pp.173-178
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    • 2007
  • Improvement of welding property of seat fiame is necessary for safety because seat frame is a unique connecting structural part between the rider and vehicle. Generally the robot and jig system for own use is used for welding of seat frame and unwelded zone can be inspected because of the geometrical interference between robot and jig system. In this study the unwelded zone of the conventional welding jig system is analysed and the 3D modeling and design change to solve the problem is discussed. As a result the weldability of system is improved and the manual welding jig is unnecessary because of the optimal jig system.

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Design and Characterization of Measurement Jig for Embedded LTCC Balun (내장형 저온소성세라믹 발룬용 측정지그의 설계 및 평가)

  • Park, S.D.;Yoo, C.S.;Yoo, M.J.;Lee, W.S.;Won, K.H.;Yoon, M.H.
    • Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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    • 2004.07b
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    • pp.644-647
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    • 2004
  • RF 시스템에서 발룬(Balun)은 회로기판과 집적회로 사이의 임피던스 매칭에 사용되는 소자로서, 전력의 균등한 분배와 함께 180도 위상차를 만드는 역할을 하는 주요 회로부품이다. 시스템의 요구사양에 따라 balanced 임피던스가 $50\Omega$인 소자뿐만 아니라, 25 또는 100, $200\Omega$인 소자들도 많이 사용되는데, 대부분의 계측기가 $50\Omega$을 I/O 임피던스로 설정하고 있어, balanced 임피던스가 $50\Omega$이 아닌 경우 특성을 측정하기 위해서는 별도의 지그설계가 필요하다. 본 연구에서는 중심주파수가 900MHz이고, balanced 임피던스가 $100\Omega$이며, LTCC 모듈 내에 내장되는 임베디드 발룬의 최적 평가를 위한 PCB 측정지그의 구조에 대하여 설계 및 시뮬레이션을 실시하고, 이에 따라 제작된 지그를 시뮬레이션 결과와 비교하였다. 지그를 구성하는 마이크로스트림의 임피던스를 조절함으로써 유효한 측정주파수범위를 넓힐 수 있었으며, 제작된 지그는 설계치에 거의 근접한 전송특성을 나타내었다.

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