• Title/Summary/Keyword: 'PASS'

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Ring Resonator Based Band-pass Filter with Enhanced Sideband Suppression (사이드밴드 억압비가 향상된 링 공진기형 대역통과 필터)

  • Kyoung, Un-Hwan;Kim, Gun-Duk;Lee, Sang-Shin;Eo, Yun-Seong
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.195-196
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    • 2008
  • A ring resonator based band-pass filter enabling enhanced sideband suppression was proposed and demonstrated. It is composed of a single-ring based-pass section combined with a band-rejection section based on two different coupled rings. As for the achieved device performance, bandwidth was reduced from 98 MHz to 48 MHz by about 51% with no remarkable excessive insertion loss as expected. And the quality factor of the device was increased by about 105%.

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Design of RF Digitally Controlled Ring Oscillator Using Negative-Skewed Delay Scheme (부 스큐 지연을 이용한 초고주파 디지털 제어 링 발진기 설계)

  • Choi, Jae-Hyung;Hwang, In-Seok
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.439-440
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    • 2008
  • A high-speed DCO is proposed that uses the negative-skewed delay scheme. The DCO consists of a ring of inverters with each PMOS transistor driven from the output of 3 earlier stage through a set of minimum-sized pass-transistors. The digitization of negative-skewed delay is achieved by selecting pass-transistors turned on and digitizing the gate voltages of the selected pass-transistors. The proposed 7-stage DCO has been simulated using 1.8V, $0.18\;{\mu}m$ TSMC CMOS process to obtain a resolution of 3ps and an operation range of 2.88-5.03GHz.

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Multi-harmonic Suppression Band-Pass Filter for Communication System

  • Zhang, Wenmei;Han, Liping;Ma, Runbo;Mao, Junfa
    • ETRI Journal
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    • v.29 no.4
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    • pp.533-535
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    • 2007
  • For the purpose of decreasing intermodulation distortion, a new multi-harmonic suppression band-pass filter based on a microstrip radial stub is studied. Compared with traditional resonator filters, the new filter can suppress the second, third, and even fourth harmonics directly. The dimension of the filter is about $0.3\;{\lambda}_{g^0}{\times}0.13\;{\lambda}_{g^0}$ (${\lambda}_{g^0}$ is the guiding wavelength at the resonant frequency). Only one gap was introduced, so lower insertion loss can be obtained. Basic agreement between the measured and simulated results has been achieved.

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Design of Rolling Pass Schedule utilizing Grain Refinement by Strain Accumulation (변형률누적에 의한 결정립미세화를 응용한 압연 패스 스케줄의 설계)

  • Park, Jong-Jin;Lee, Sang-Joo
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.27 no.3
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    • pp.464-471
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    • 2003
  • Among various methods to acquire high strength in plain carbon steel, the mettled of grain refinement by controlling thermo-mechanical processing parameters has gained a great attention if steel rolling industries. In the present study, three different rolling pass schedules are proposed to obtain fine grains which are based on combined results of recrystallization modelling, finite element analysis and experiment. Since meta-dynamic or dynamic recrystallization has been found to be very effective in producing fine grains, reduction ratio and interpass time in the proposed rolling pass schedules were determined in order to invoke such recrystallization as often as possible.

A Study of the Comparison for Performance Advancement of Seam Tracking in Gas Metal Arc Welding (가스 메탈 아크 용접에서 추적성능 향상을 위한 성능 비교 연구)

  • Lee, Jeong-Ick
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.1
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    • pp.9-18
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    • 2007
  • There have been continuous efforts for automation of joint tracking system. This automation process is mainly used to do in root pass of gas metal arc welding in the field of heavy industry and shipbuilding etc. For automation, it is important using of vision sensor. Welding robot with vision sensor is used for weld seam tracking on welding fabrication. Recently, it is used to on post-weld inspection for weld quality evaluation. For real time seam tracking, it is very important role in vision process technique. Vision process is included in filtering and thinning, segmentation processing, feature extraction and recognition. In this paper, it has shown performance comparison results of seam tracking for real time root pass on gas metal arc welding. It can be concluded better segment splitting method than iterative averaging technique in the performance results of seam tracking.

The Multipass Joint Tracking System by Vision Sensor (비전센서를 이용한 다층 용접선 추적 시스템)

  • Lee, Jeong-Ick;Koh, Byung-Kab
    • Transactions of the Korean Society of Machine Tool Engineers
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    • v.16 no.5
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    • pp.14-23
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    • 2007
  • Welding fabrication invariantly involves three district sequential steps: preparation, actual process execution and post-weld inspection. One of the major problems in automating these steps and developing autonomous welding system is the lack of proper sensing strategies. Conventionally, machine vision is used in robotic arc welding only for the correction of pre-taught welding paths in single pass. However, in this paper, multipass tracking more than single pass tracking is performed by conventional seam tracking algorithm and developed one. And tracking performances of two algorithm are compared in multipass tracking. As the result, tracking performance in multi-pass welding shows superior conventional seam tracking algorithm to developed one.

Rational high-speed railway plan for passing through metropolis (고속철도의 합리적인 광역도시 통과방안)

  • Ahn Yong-Mo;Kim Hong-Yeoun
    • Proceedings of the KSR Conference
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    • 2005.05a
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    • pp.144-150
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    • 2005
  • After the historic opening of the first section of KTX(Korea Train eXpress), it has been made changes three times in a plan to pass through cities of Daejeon, Daegu in the construction of the high speed train's second section(underground${\to}$ on ground${\to}$ under ground${\to}$ on ground). Thereafter, it has been repeatedly argued that the plan to pass through underground caused many problems such as prevention of an accident in tunnel, the difficulty of maintainence, the disadvantage of passengers' moving line. Thus construction on ground plan is coming up again with relation to the interest among local people. There have been lots of national budget loss, construction period delay in this project and people hardly trust policies about national project and nor do engineers. It will be presented that the railway line which is accorded with the characteristics of region, an agreement with local communities about national project, the reasonable procedure to determine how to pass through cities, resolve the conflict among neighborhood, and the role of engineers.

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An Optimal Method to Improve the Visual Quality of Medical Images

  • Shin, Choong-ho;Jung, Chai-yeoung
    • Journal of Integrative Natural Science
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    • v.8 no.2
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    • pp.141-144
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    • 2015
  • As the visual quality of X-ray images is a critical reference for the accuracy of the clinical diagnosis, the methods to improve the quality of X-ray images have been investigated. Among many existing methods, using frequency domain filter is a very powerful method to improve the visual quality of images. In this paper, the inherent noises of the input images are suppressed by adding the Laplacian image to the subjected image. The medical X-ray images using the optimal high pass filter has shown improved edges. Further, the optimal high frequency emphasis filter has shown the improved contrast of flat areas by using the result image from the optimal high pass filter. Also the resulting images of the global contrast have improved by the histogram equalization. As a result, the proposed methods have shown enhanced contrast and edges of the images with noise canceling effect.

Multi-path LR parsing for nonsegmental words using one-pass strategy (원-패스 전략을 사용하는 미분절어를 위한 다중-경로 LR 파싱)

  • Lee, Gi-O;Lee, Yong-Seok
    • Annual Conference on Human and Language Technology
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    • 1994.11a
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    • pp.146-154
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    • 1994
  • 한국어는 단어들 사이에 공백이 없는 미분절어이기 때문에, 한국어를 분석하기 위해서는 단어의 경계를 식별하는 분절이 선행되어야 한다. 분절은 쉽지 않은 과정이고 잘못된 분절은 구문분석, 의미 분석 단계에서 심각한 오류를 유발하기 때문에 형태소 분석의 중요한 작업중의 하나가 되어왔다. 기존의 한국어 분석 시스템들은 분절의 어려움으로 인하여 입력 문자열의 끝까지 읽은 후, 우에서 좌로 분석하는 two-pass 전략이나 단어들 사이에 공백을 삽입하여 처리하는 방법을 사용하였다. 또한 이 시스템들은 형태소 분석이 완결된 후, 파서에게 결과를 전달하는 순차적인 전략을 사용하였다. 본 논문은 영어의 분석과 같이 형태소 분석 동안에 파싱을 할 수 있는 one-pass 전략을 사용하여 한국어를 효율적으로 처리하는 모델을 제안한다. 이를 위해 형태소 분석 방법으로써 확장된 최장일치법을 제시하며, 위 방법에서 생성되는 문제점인 다중-범주 구를 처리하기 위하여 다중-경로 LR 파싱을 제시한다.

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Crop Control by Using Neural Network in Edger Mill (신경망을 이용한 Edger압연 크롭저감 연구)

  • 천명식;장대섭;이준정
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • 1999.08a
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    • pp.438-446
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    • 1999
  • Crop minimization of the top and bottom ends of hot rolled plate, in a plate, in a plate mill, has been investigated. The existing model to determine the edging pattern at the finishing rolling pass was not reasonable to get high width accuracy and rolling yields. New models including width prediction have been formulated by using neural network model of back propagation learning algorithm and statistical analysis based on the actual production rolling data to give the optimal pattern for minimizing trimming loss. Using these models, at a given rolling condition of broadside pass and finishing pass and the permissible condition of width variation, it was possible to minimize crip at the top and bottom ends according to optimum procedure in plate mill. An application to improve the plan view pattern reduced width variation by 23% and crop length by 30% on average with an effective fishtail crop shape.

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