• Title/Summary/Keyword: Technology-Engineering

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Image Mosaicing Generation System for Automated Inspection of Bridge Structures (교량 구조물 안전점검 자동화를 위한 정합 이미지 생성 시스템)

  • Kim, SeokJin;Lee, SungWon;Jeon, Mingeon;Kim, Sujong;Seo, Dongmahn
    • Proceedings of the Korea Information Processing Society Conference
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    • pp.1105-1106
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    • 2019
  • 고도성장 당시 건축되었던 사회기반시설들은 노후화로 인한 안전사고의 위험성이 부각되고 있다. 사회기반시설 중 교량의 경우 건축방식, 기후에 따른 안전점검 간 제약사항이 생긴다. 본 논문에서는 드론을 통해 점검이 필요한 교량을 촬영한다. 교량의 촬영 데이터를 정합 이미지로 생성하여 교량 내 유지보수를 위한 교량 모니터링 시스템을 제안한다.

The Study on Current Limiting Characteristic Analysis of Magnetic Shielding Type Fault Current Limiter

  • Lee, Jae;Lim, Sung-Hun;Kang, Hyeon-Gon;Ko, Seok-Cheol;Han, Byoung-Sung
    • Progress in Superconductivity
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    • v.3 no.2
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    • pp.235-240
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    • 2002
  • In this paper, we investigated the current limiting characteristic in the magnetic shielding type fault current limiter(MSFCL). The circuit analysis was executed by using finite differential method(FDM). This paper suggests that the current limiting performance can be achieved in two ways (resistive and inductive one), according to design parameter. By comparing current limiting characteristics in two ways and surveying the important parameters which determine the operational way after fault occurs in the design of MSFCL, it is shown that the magnetic shielding type fault current limiter can be operated in either resistive or inductive way.

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Characteristics of DGS Transmission Line and Influence of Lumped Elements on DGS (Defected Ground Structure를 갖는 전송선로의 특성과 집중소자에 의한 특성)

  • Kim, Chul-Soo;Sung, Jung-Hyun;Kil, Joon-Bum;Kim, Sang-Hyeok;kim, Ho-Sub;Park, Jun-Seok;Ahn, Dal
    • The Journal of Korean Institute of Electromagnetic Engineering and Science
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    • v.11 no.6
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    • pp.946-951
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    • 2000
  • In this paper, we showed the characteristic of transmission line with DCS (Defected Ground Structure), which is etched on the metallic ground plane. And we extracted the equivalent element value of DGS section. Effects of a lumped element placed on DGS section were investigated by employing DGS of dumbbell shape and parallel resonator with DGS. Chip type resistor, inductor, and capacitor were chosen as lumped elements for experiments. Experimental results show that the Q-factor and resonant frequency of the proposed DGS section can be controlled directly by using the external lumped element.

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Simultaneous Equation Estimation in Finance and Corporate Financial Decision: Empirical Evidence from Pakistan Stock Exchange

  • AHMED, Wahab;KHAN, Hadi Hassan;RAUF, Abdul;ULHAQ, SM Nabeel;BANO, Safia;SARWAR, Bilal;HUDA, Shams ul;KHAN, Mirwaise;WALI, Ahmed;DURRANI, Maryam Najeeb
    • The Journal of Asian Finance, Economics and Business
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    • v.8 no.3
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    • pp.11-21
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    • 2021
  • In the last few years, there is growing interest in the field of simultaneous equation estimation in finance due to the endogeneity problem caused by measurement errors, simultaneity, or omitted variables. This study aims to discuss the endogeneity problem in corporate financing decisions and investigate the interrelationship of financial decision-making such as investment decision, dividend decision, and external financing decision in Pakistan Stock Exchange (PSX) using two-stage least squares (2SLS) and generalized method of moment (GMM) estimation. The Bruech-Pagan test shows that the data has no heteroskedasticity issue and 2SLS is a better approach in the context of this study as compared to the GMM approach, and internal instruments are also sufficiently strong and valid. The three financial decision-making attributes are not jointly determined, and the dividend is influenced by one-sided investment. In the emerging stock market context, external financing and investment are not inter-related and did not affect each other. The question of whether the simultaneous equation estimation can be useful in the context of the emerging stock markets and newly-growing firms remains unanswered. The inclusive evidence shows that the theoretical link in the emerging stock market is difficult to prove like in developed stock markets.

A Estimation of Emotional Sensibility by that Music and Vibration Stimulation of the Cellular Phone (휴대폰을 통한 음향 및 진동자극이 인체의 감성에 미치는 영향 평가)

  • Kim M. H.;Kim K. B.;Kim S, W.;Oh D. I.;Kim D. W.
    • Proceedings of the KAIS Fall Conference
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    • pp.111-114
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    • 2005
  • 현재 휴대폰은 대중화되고 있으며, 로봇기술 또한 각광 받고 있다. 그래서 우리는 로봇기술과 휴대폰 기술을 접목한 RCP(Robotic Cellular Phone)를 구현하려 한다. RCP를 구성하기 위해서 휴대폰의 움직임을 구현, 외부환경 및 RCP 자신의 상태인식 기능 그리고 사용자의 감성을 유발할 수 있는 감성유발엔진 및 감성평가모델의 군축이 필요하다. 본 연구에서는 감성평가모델의 개발을 위하여 음악과 진동 자극을 주어 생체신호 HRV와 GSR을 측정하여 정량적인 데이터를 수집, 특정감성을 평가하였다. 감성을 평가함에 있어서 개인의 차이가 발생하기 때문에 개개인의 표준화 (Normalize)가 필요하게 되었다. 표준화를 위하여 IAPS영상을 활용한 결과 우리가 얻고자 하는 감성의 변화에 대한 판단을 할 수 있음으로 감성의 신호 모델을 유추할 수 있었다.

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Study on the Structure of Wireless Network Using LDPC code (LOPC Code를 이용한 차세대 무선망 구성에 관한 연구)

  • Cho Kyung-Chul;Kim Hyung-Suck;Kim Sun-Hyung
    • 한국정보통신설비학회:학술대회논문집
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    • pp.189-192
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    • 2002
  • 최근 인터넷과 노트북, 그리고 휴대용 이동 통신 기기들이 급속히 보급되면서 사용자들은 일반 컴퓨팅 환경보다 편리한 이동성과 대용량의 데이터 전송을 요구하고 있다. 따라서, 본 논문에서는 이러한 요구에 부응하기 위하여 LDPC coding 기술 및 등화기술을 OFDM 방식에 적용한 차세대 무선 시스템을 제안한다.

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A Tight Coupling Microstrip Directional Coupler with High Directivity Performance using FE Calculations

  • Kim, Young-Tae;Kim, Sang-Hyuk;Kim, Hyeong-Seok;Park, Jun-Seok;Song, Seung-Hoon;Lim, Jae-Bong
    • KIEE International Transactions on Electrophysics and Applications
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    • v.11C no.4
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    • pp.150-154
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    • 2001
  • In this paper, we presented a novel structure of microstrip directional coupler for realizing the high directivity characteristic and tight coupling. The achievement of the high directivity with microstrip configuration was carried out by matching the even and odd mode effective phase velocities. By using 2-dimensional finite element (FE) calculations, the phase velocity for each mode and design parameters were extracted for given dimensions. Based on the extracted design parameter with phase-matched condition, we designed and fabricated 3dB and 4.7dB directional coupler at 2.0GHz. Experimental results of microstrip coupler show good performance with excellent isolation characteristics.

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