• Title/Summary/Keyword: D/B 구축

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A Design of 77 GHz LNA Using 65 nm CMOS Process (65 nm CMOS 공정을 이용한 77 GHz LNA 설계)

  • Kim, Jun-Young;Kim, Seong-Kyun;Cui, Chenglin;Kim, Byung-Sung
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.24 no.9
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    • pp.915-921
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    • 2013
  • This work presents a 77 GHz low noise amplifier(LNA) for automotive radar systems using 65 nm RF CMOS process. The LNA is composed of three stage common source amplifiers and includes transmission line matching networks. To reduce the time for three dimensional EM simulation, we optimize the transmission line impedance matching network using a pre-built EM library. The proposed compact simulation technique is confirmed by measurement results. The peak gain of the LNA is 10 dB at 77 GHz and input/output return losses are below -10 dB around the design frequency.

A Study of Noise Robust Content-Based Music Retrieval System (잡음에 강인한 내용기반 음악 검색 시스템에 대한 연구)

  • Yoon, Won-Jung;Park, Kyu-Sik
    • Journal of the Institute of Electronics Engineers of Korea SP
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    • v.45 no.6
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    • pp.148-155
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    • 2008
  • In this paper, we constructed the noise robust content-based music retrieval system in mobile environment. The performance of the proposed system was verified with ZCPA feature which is blown to have noise robust characteristic in speech recognition application. In addition, new indexing and fast retrieval method are proposed to improve retrieval speed about 99% compare to exhaustive retrieval for large music DB. From the computer simulation results in noise environment of 15dB - 0dB SNR, we confirm the superior performance of the proposed system about 5% - 30% compared to MFCC and FBE(filter bank energy) feature.

Evaluation System of the Thermal Properties of the Exothermic Agents (발열 보온재의 특성평가 시스템 구축)

  • Shin, D.Y.;Kim, D.J.;You, B.D.;Kim, N.S.;Oh, S.H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 2008.05a
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    • pp.46-51
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    • 2008
  • In this study, evaluation system of the thermal properties of the exothermic agents was investigated. Exothermic agents property evaluation system was developed by metering variation of power supply. Thermal properties of exothermic agents was affected by material mixture condition of exothermic agents, however, it was not affected by temperature. It is possible to make various exothermic agents by means of regulating thermal properties which is based on property evaluation system of exothermic agents.

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Design and Fabrication of the 94 GHz Branch-line Bandpass Filter using CPW structure (CPW 구조를 이용한 94 GHz Branch-line 대역통과 여파기의 설계 및 제작)

  • Kwon, Hyuk-Ja;Bang, Suk-Ho;Lee, Sang-Jin;Yoon, Jin Seob;Rhee, Jin-Koo
    • Journal of the Institute of Electronics Engineers of Korea SD
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    • v.44 no.5
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    • pp.36-41
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    • 2007
  • We report the 94 GHz CPW branch-line bandpass filter for planar integrated millimeter-wave circuits. The branch-line coupler operates as a transversal filtering section by connecting the coupling ports to the open load stubs and taking the isolation port as the output node. For design of the 94 GHz branch-line bandpass filter, we built the CPW library and optimized the characteristic impedances and the lengths of the branch-line coupler and the open load stubs. The fabricated 94 GHz bandpass filter exhibits an insertion loss of 2.5 dB with an 11.7 % 3 dB relative bandwidth and the return loss is -18.5 dB at a center frequency of 94 GHz.

Design and fabrication of V-band cascode down-mixer using CPW structure (CPW 구조를 이용한 V-band cascode 하향 주파수 혼합기의 설계 및 제작)

  • An, D.;Chae, Y. S.;Kang, T. S.;Sul, W. S.;Lim, B. O.;Rhee, J. K.
    • Proceedings of the Korea Electromagnetic Engineering Society Conference
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    • 2001.11a
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    • pp.213-217
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    • 2001
  • 본 논문에서는 CPW 구조를 이용하여 60 GHz 무선 시스템 응용을 위한 V-band용 하향 주파수 혼합기를 설계 및 제작하였다. 하향 주파수 혼합기의 설계 및 제작에 있어서 GaAs PHEMT(Pseudomorphic high electron mobility transistor)를 기반으로 하였으며, 회로설계를 위해 coplanar waveguide(CPW) 라이브러리를 구축하여 이용하였다. 제작된 하향 주파수 혼합기의 변환이득은 국부발진주파수(LO) 입력이 8 dBm일 때 -8.5 dB의 최대 변환이득 특성을 얻었으며 Pl dB는 -3.3 dBm을 얻었다. 제작된 회로의 칩 크기는 1.6$\times$l.6 $\textrm{mm}^2$ 이다.

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Building B2B system using timestamp tree for data change detection in low speed network environment (저속 네트워크 환경에서 데이터 변화 탐지를 위해 타임스탬프 트리를 이용하는 B2B 시스템 구축)

  • Son Sei-Il;Kim Heung-Jun
    • The KIPS Transactions:PartD
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    • v.12D no.6 s.102
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    • pp.915-920
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    • 2005
  • In this paper we expanded a existing web based B2B system to support users in low speed network. To guarantee shared dat a consistency between clients and a server, we proposed a method of data change detection by using a time stamp tree and the performance analysis of the proposed method was proved by a simulation. Under the worst condition that leaf nodes of a times tamp tree were changed uniform distribution, the simulation result showed that the proposed method was more efficient than a sequential detection until the percentage of changed nodes were below $15\%$. According to our observation, the monthly average of data change was below $7\%$ on a web-based construction MRO B2B system or a company A from April 2004 to August 2004. Therefore the Proposed method improved performance of data change detection in practice. The proposed method also reduced storage consumption in a server because it didn't require a server to store replicated data for every client.

A Study on Face Recognition Method based on Binary Pattern Image under Varying Lighting Condition (조명 변화 환경에서 이진패턴 영상을 이용한 얼굴인식 방법에 관한 연구)

  • Kim, Dong-Ju;Sohn, Myoung-Kyu;Lee, Sang-Heon
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.49 no.2
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    • pp.61-74
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    • 2012
  • In this paper, we propose a illumination-robust face recognition system using MCS-LBP and 2D-PCA algorithm. A binary pattern transform which has been used in the field of the face recognition and facial expression, has a characteristic of robust to illumination. Thus, this paper propose MCS-LBP which is more robust to illumination than previous LBP, and face recognition system fusing 2D-PCA algorithm. The performance evaluation of proposed system was performed by using various binary pattern images and well-known face recognition features such as PCA, LDA, 2D-PCA and ULBP histogram of gabor images. In the process of performance evaluation, we used a YaleB face database, an extended YaleB face database, and a CMU-PIE face database that are constructed under varying lighting condition, and the proposed system which consists of MCS-LBP image and 2D-PCA feature show the best recognition accuracy.

Implementation of an Adaptive Equalizer for the Home Phone Lines (댁내 전화 선로의 적응형 등화기 구현)

  • 이성현;은창수;김홍석
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.26 no.11A
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    • pp.1820-1826
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    • 2001
  • In this paper, we present a modeling scheme for the already-installed two-wire home phone lines with arbitrary topologies and show that the inter-symbol interference due to the topology can be removed using an adaptive equalizer. The transmission characteristics of the arbitrary-configured two-wire home phone lines can be analyzed through the ABCD matrices. The simulation result shows that the impedance mismatch due to the branch lines renders nulls in the frequency response or delayed pulses in the impulse response. These nulls or delayed pulses cause inter-symbol interference that inhibits correct signal detection. An adaptive equalizer is shown to be effective in eliminating the interference. Also, the simulation result shows that the equalizer converges in 1.5 ms at a data rate of 1 Msps at signal-to-noise ratios greater than 15 dB. In addition, from the result of relation between E$\_$b//N$\_$and BER(Bit Error Rate), we can see that E$\_$b//N$\_$o/ more than 19 dB is required for the data communication with a BER less than 10$\^$-5/.

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CALS 개념에 의한 기술정보 D/B 구축

  • 김철환;강형모
    • Proceedings of the CALSEC Conference
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    • 1997.11a
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    • pp.79-90
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    • 1997
  • $\bigcirc$민ㆍ관ㆍ군 기술정보 공유 : 국가적으로 기술정보개발, 획득 비용 절감 $\bigcirc$기술 정보의 신속한 검색 및 획득 $\bigcirc$ 기술획득의 중복성 제거 $\bigcirc$ CAS 개념에 의거 국제간에도 교류 $\bigcirc$정보화 시대에 부응/국가경쟁력 제고(중략)

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