• Title, Summary, Keyword: 스마트 분배기

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Ultra-broadband Resistive Power Divider for Smart Grid application (스마트 그리드용 초광대역 저항성 전력 분배기)

  • Choi, Jung-Han;Jung, Chang-Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.1
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    • pp.384-389
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    • 2011
  • This article presents an ultra broadband resistive power divider circuit for smart grid applications. Since the future smart grid system is expected to deploy high speed power line communication, the frequency response of the resitive power divider circuit is naturally of significance. Employing a thin film technology, the resistive power divider was designed, measured, and fabricated. For the circuit design, the conductor-backed coplanar waveguide line was firstly designed and measured. The 3 dB cutoff frequency was 72 GHz and S11 remains <-20 dB upto 70 GHz. The fabricated resistive power divider shows the 3 dB cutoff frequency of 50 GHz. It was experimentally verified that the resistive power divider circuit shows the insertion loss of 6 dB for high-speed input signal (40 Gb/s).

자재업체탐방 - 고른 열분배로 따뜻한 가정, 따뜻한 사회 추구, (주)상신

  • 대한설비건설협회
    • 월간 기계설비
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    • pp.61-66
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    • 2013
  • 사랑이 가정을 평화롭고 행복하게 한다면 온기를 골고루 분배하는 열분배는 따뜻한 주거환경을 만드는 중요한 요소이다. "행복의 시작은 가정"이라는 정신으로 사람을 생각하고 에너지 절감에 기여하며 친환경 기업을 추구하는 (주)상신이 최근 스마트 유량조절시스템을 개발하고 특허 출원에 들어갔다. 1987년 창립 이래 27년간 볼밸브와 온수분배기를 최고의 제품으로 만들기 위해 최선을 다해온 상신은 주거환경을 바꾼 혁신기업으로 평가받고 있다.

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Efficient Parallel IP Address Lookup Architecture with Smart Distributor (스마트 분배기를 이용한 효율적인 병렬 IP 주소 검색 구조)

  • Kim, Junghwan;Kim, Jinsoo
    • The Journal of the Korea Contents Association
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    • v.13 no.2
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    • pp.44-51
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    • 2013
  • Routers should perform fast IP address lookup for Internet to provide high-speed service. In this paper, we present a hybrid parallel IP address lookup structure composed of four-stage pipeline. It achieves parallelism at low cost by using multiple SRAMs in stage 2 and partitioned TCAMs in stage 3, and improves the performance through pipelining. The smart distributor in stage 1 does not transfer any IP address identical to previous one toward the next stage, but only uses the result of the previous lookup. So it improves throughput of lookup by caching effects, and decreases the access conflict to TCAM bank in stage 3 as well. In the last stage, the reorder buffer rearranges the completed IP addresses according to the input order. We evaluate the performance of our parallel pipelined IP lookup structure comparing with previous hybrid structure, using the real routing table and traffic distributions generated by Zipf's law.

Technology of Smart Optical Distribution Network and its Standardization Trends (스마트 광 분배망 기술 및 표준화 동향)

  • Kim, S.C.;Kim, G.Y.;Kim, J.J.;Yoo, H.;Lee, D.S.;Kim, Y.S.
    • Electronics and Telecommunications Trends
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    • v.29 no.5
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    • pp.145-155
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    • 2014
  • 최근 급격히 증가하고 있는 모바일 데이터 트래픽으로 인하여 이를 효과적으로 수용할 수 있는 수동형 광 가입자망(PON: Passive Optical Network) 기술에 대한 요구사항도 높아져가고 있다. 특히, 서비스 제공 시간을 줄이고 망 신뢰성을 향상시키며 망 운용관리 비용을 줄이기 위하여 PON 인프라인 광 분배망(ODN: Optical Distribution Network) 링크에 대한 실시간 장애 검출 기술과 물리적 광 커넥션의 자동인식 및 통합관리 기술에 활발한 연구 및 표준화가 진행 중이다. 본고에서는 PON 링크의 실시간 장애 검출 기술 및 광 분배망 자동인식/통합관리 기술동향에 대하여 소개하고 연계된 국제 표준화 진행사항에 대해 알아본다. 마지막으로 ETRI에서 연구 개발 중인 스마트 RN(Remote Node) 기술에 대해 기술한다. 스마트 RN 기술은 장거리(60Km 이상), 고분기(128분기 이상) 추세로 진화되고 있는 PON망에 적용하여 자동화된 광계층의 장애 검출 및 ODN 인프라 자동인식/통합관리 기능을 제공한다.

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Design of Control Mixer for 40% Scaled Smart UAV (스마트무인기 축소모형의 조종면 혼합기 설계)

  • Gang, Yeong-Sin;Park, Beom-Jin;Yu, Chang-Seon
    • Aerospace Engineering and Technology
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    • v.5 no.2
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    • pp.240-247
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    • 2006
  • Tilt rotor aircraft is a multi-configuration airplane which has three independent flight modes; helicopter, conversion, and aiplane. The control surface mixer resign is reqctired to generate and distribute efficient control forces and moments in each flight mode. In the conversion mode, the thrust vector is changed from helicopter mode to airplane, therefore the thrust vector makes undesired forces and moments which affect on pitch, roll and yaw dynamics. This paper describes the design results of control surface mixer design which minimize the undesired forces and moments due to nacelles tilting angle change for 4O% scaled model.

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Polymer-based Large Core Optical Splitter for Multimode Optical Networks (멀티모드 광네트워크용 폴리머기반 대구경 광분배기)

  • An, Jong Bae;Lee, Woo-Jin;Hwang, Sung Hwan;Kim, Gye Won;Kim, Myoung Jin;Jung, Eun Joo;Moon, Jong Ha;Kim, Jin Hyeok;Rho, Byung Sup
    • Korean Journal of Optics and Photonics
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    • v.24 no.4
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    • pp.184-188
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    • 2013
  • Two types of polymer-based optical splitters with $200{\mu}m$ large core are presented for optical multimode networks, such as smart home networks, intelligent automotive networks, etc. Optical splitters that have 1:1 symmetric and 9:1 asymmetric structure were fabricated by a ultra violet(UV)-imprint technology using a deep etched Si(silicon) master by the Bosch process. In this paper, we successfully fabricated the symmetric and asymmetric optical splitters with suitable optical network applications.

A new satellite CAS using password-based protocol (패스워드 기반 프로토콜을 이용한 새로운 위성 한정 수신 시스템)

  • Kim, Young-Soo;Sohn, Ki-Wook;Yang, Hyung-Kyu;Won, Dong-Ho
    • The Transactions of the Korea Information Processing Society
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    • v.6 no.12
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    • pp.3597-3605
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    • 1999
  • We introduce a new satellite Conditional Access System(CAS) that a subscriber could watch a pay-TV knowing only his or her identity and password, without using a smart card. For this new system, two password-based protocols are presented which not only share a session key and authenticate each other but also download an authorization key. This system has some merits: First, compared with current systems, it reduces the amount of computations by eliminating the AK-encryption module in SMS(Subscriber Management System) and simplifying the receiver's CW-decryption process. Second, since this system does not need an expensive Card Adaptive Device(CAD), it can reduce costs. finally it provides descrambler independence allowing it to be used through any TV set-top box that includes a descrambler, unlike the current system that a descrambler is linked with a smart card.

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Critical Path Analysis for Codesign of Public Key Crypto-Systems (공개키 연산기의 효율적인 통합 설계를 위한 임계 경로 분석)

  • Lee Wan bok;Roh Chang hyun;Ryu Dae hyun
    • Journal of Korea Multimedia Society
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    • v.8 no.1
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    • pp.79-87
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    • 2005
  • In e-commerce applications, a public key cryptosystem is an important and indispensible element for the basic security operations such as authentication, digital signaturing, and key distribution. In wired network environments, the public key infrastructure certificate, which is based on X.509 specification, has been widely used. On the other hand, it still remains difficult to use the certificate information in wireless network environments due to the inherent limitations of the hand-held devices such as low computational power and short battery life. In this paper, we facilitate a codesign approach by implementing a software public-key cryptosystem and classifying its internal computation overheads quantitatively using a software profiling technique. Moreover, we propose a method to analyze the profiled data and apply it to the problem of software/hardware partitioning in a codesign approach. As an illustrative example, we analyze the computational overheads of an EC-Elfagamal application and examine a critical computational path.

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