• Title/Summary/Keyword: Advanced processing

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High-Speed Femtosecond Laser Micromachining with a Scanner (스캐너를 이용한 고속 펨토초 레이저 가공 기술)

  • Sohn, Ik-Bu;Choi, Sung-Chul;Noh, Young-Chul;Ko, Do-Kyeong;Lee, Jong-Min
    • Laser Solutions
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    • v.9 no.2
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    • pp.11-15
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    • 2006
  • We report experimental results on the high-speed micromachining using a femtosecond laser (800 nm, 130 fs, 1kHz) and galvanometer scanner system (Raylase, Germany). Periodic hole drilling of silicon and glass with the scan speed of 1-20 mm/s is demonstrated. Finally, we demonstrate the utility of the femtosecond laser application to ITO patterning by using a high-speed femtosecond laser scanner system.

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Development of STI Service Strategies for Supporting R&D Knowledge Activities (지식활동 지원을 위한 학술정보서비스 개발 전략)

  • Shim, Hyoung-Seop;Choi, Hee-Seok;Park, Ji-Young;Youn, Hyo-Hun;You, Beom-Jong
    • Annual Conference of KIPS
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    • 2015.10a
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    • pp.1642-1643
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    • 2015
  • 기존의 학술정보서비스는 서지정보에 대한 메타데이터, 원문 제공에 초점을 맞추고 구축, 서비스하고 있다. 그러나 현재 학술정보서비스는 수집된 데이터를 분석하여 연구자들의 연구활동에 필요로 하는 정보를 콘텐츠 제공이 필요하다. 본 연구는 국내 학술정보서비스 현황을 살펴보고, Big Data, IoT 등 최신 정보기술을 활용한 학술정보서비스 전략에 대해 연구하였다.

Advanced Medical Information Visualization Service for PACS-Grid with medical collaboration (PACS-Grid 를 위한 의료협업 기반 고도화된 의료정보 가시화 서비스)

  • Kim, Younghun;Park, Sangsu;Kim, Byoung-jin;Youn, Chan-hyun
    • Annual Conference of KIPS
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    • 2009.04a
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    • pp.957-960
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    • 2009
  • 의료영상기기의 발달과 등장으로 진단과 치료목적으로 생성된 의료영상은 기하급수적으로 증가하고 있다. 게다가 의료 환경이 보다 전문화, 집중화 되면서 의료기관 간의 협업의 중요성이 강조되고 있다. 의료기관간의 효과적인 의료협업을 위해서는 의료정보의 원활한 가시화와 이를 지원하기 위한 정보 처리는 필수적이다. 의료기관간의 의료정보를 가시화하기 위해서는 안정적이고 다양한 의료정보를 표현하기 위한 플랫폼이 필요하다. 본 연구에서는 다양한 의료정보 협업을 지원하는 의료협업 플랫폼을 제안하고 기존의 PACS-Grid 와 서비스 기반의 의료정보 협업 가시화 서비스를 설명하고자 한다.

A Design of User Profile Agent Model for Intelligent Tutoring System (지능형 튜터링 시스템을 위한 사용자 프로파일 에이전트 모델 설계)

  • Jang, Jin-Cheul;Hong, Sung-Ho;Hong, Seong-Yong;Yi, Mun-Yong;Yoon, Wan-Chul
    • Annual Conference of KIPS
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    • 2011.04a
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    • pp.1222-1225
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    • 2011
  • 개인화된 IT 서비스의 트렌드는 학습자를 위한 튜터링 시스템에도 학습자의 능력과 수요를 고려한 개인화된 서비스를 요구하고 있다. 본 연구에서는 지능형 튜터링 시스템을 위해 사용자 프로파일 에이전트(UPA, User Profile Agent) 모델을 제안한다. UPA는 프로세스, 메타데이터, 사용자 인터페이스로 구성되어 있으며, 사용자의 기본 정보와 학력 및 경력 정보, 학습 영역 지식, 개인 능력 측정 정보를 메타데이터에 기반으로 저장한다. 저장된 사용자 프로파일 정보는 에이전트의 프로세스에 의해 가공되어 학습자에게 유용한 정보를 제공할 수 있도록 기여할 수 있다. 향후 본 논문의 모형 설계를 기반으로 이러닝 기술 환경의 변화를 반영한 지능화된 지능형 튜터링 시스템 개발에 기여할 수 있도록 연구 발전시키는 것을 목표로 한다.

Fabrication and characterization of solution processable organosilane-modified colloidal titania nanoparticles and silica-titania hybrid films

  • Kang, Dong Jun;Park, Go Un;Lee, Hyeon Hwa;Ahn, Myeong Sang;Park, Hyo Yeol
    • Journal of Ceramic Processing Research
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    • v.13 no.spc1
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    • pp.78-81
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    • 2012
  • Colloidal titania nanoparticles were synthesized by a simple sol-gel process. The obtained nanoparticles showed high crystallinity and were of the anatase type. These crystalline colloidal titania nanoparticles were organically modified using methyl- and glycidyl-grafted silanes in order to enhance their stability and solution processability. The stabilized colloidal titania nanoparticles could be dispersed homogeneously without aggregation and converted into silica-titania hybrid films with the heterogeneous Si-O-Ti bonds by a low-temperature solution process. The fabricated silica-titania hybrid films showed high transparency (~ 90%) in the visible range, and low RMS roughness (<1 nm). Therefore, the organosilane-modified crystalline colloidal titania nanoparticles can be used in solution-processable functional coatings for electro-optical devices.

A Routing Protocol for Enhancing the QoS in V2X Environment (V2X 환경에서 QoS 향상을 위한 라우팅 프로토콜)

  • Hyeon-Jun Park;Hyo-Bin Lee;Hyeon-Su Lim;Yeong-Cheol Lee;Ja-Wan Kim
    • Annual Conference of KIPS
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    • 2024.05a
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    • pp.149-150
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    • 2024
  • 차량 애드 혹 네트워크(VANET)는 운전자에게 안전하고 편안한 운전을 위한 다양한 서비스를 제공한다. VANET 은 차량의 이동으로 인해 토폴로지 변화가 빠르게 발생하기 때문에 무선 링크 품질과 링크 안정성의 변화가 극심하다는 문제가 있다. 본 논문에서는 VANET 을 위한 새로운 라우팅 프로토콜을 제안한다. 제안하는 프로토콜은 링크 품질과 링크 안정성을 사용하여 최적의 라우팅 경로를 제공하며, 네트워크 QoS 를 제공할 수 있다. 시뮬레이션 결과는 처리량, 패킷 손실률, 그리고 종단 간 지연 측면에서 상당한 성능 개선을 보여준다.

A Comparison study on cross and coaxial nozzle characteristic by using CW Nd:YAG Laser (연속파형 Nd:YAG 레이저 용접에서 크로스노즐과 동축노즐 특성 비교)

  • Lee, Ka Ram;Hwang, Chan Youn;Park, Eun Kyeong;Yoo, Young Tae
    • Laser Solutions
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    • v.16 no.3
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    • pp.11-21
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    • 2013
  • As parts are becoming more complex and smaller with the development of new materials, high-quality laser precision processing is getting the limelight. Laser enables quick processing and less deformation of materials. It also enables welding with diverse materials. In this study, the pole rod and tap for the secondary battery were laser-welded using cross and coaxial nozzles. The results of the comparative analysis of cross and coaxial nozzles according to the processing parameters showed that the coaxial nozzle had more sensitive welding characteristic to the nozzle position or pressure than the cross nozzle. This indicated that the processing parameters should be carefully determined for the welding with the coaxial nozzle. The pole rod and tap were welded together in a form of T joint to improve the output of the secondary battery, and the cross nozzle had a better welding characteristic than the coaxial nozzle.

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A Study on the Fluid Leakage Evaluation for Power Plant Valve Using Acoustic Imaging Technique (음향 영상화기법을 이용한 발전용 밸브 유체누설평가 연구)

  • Lee, S G.;Lee, S.K.;Kim, D.W.
    • Journal of Power System Engineering
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    • v.15 no.1
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    • pp.18-23
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    • 2011
  • Image processing has provided powerful techniques to extract from the acoustic signals the desired information on evaluation for leakage existence, leakage rate, and searching for leakage location, etc. The imagery NDE data available can add additional and significant dimension in nondestructive evaluation(NDE) information and thus for exploiting in applications. To extract such information the use of advanced image processing techniques is much needed. In recent years, there has been much increased use of acoustic signal image processing techniques in acoustic NDE. This approach will increase the efficiency of inspection procedures and reduce inspection time. In this paper we are concerned only with This paper is concerned mainly with the use of advanced image processing techniques in valve leakage detection and advanced image restoration and enhancement methods, which attempt to evaluate promptly by a visualization method the acoustic sources while detecting the valve leakage.

Advanced signal processing for enhanced damage detection with piezoelectric wafer active sensors

  • Yu, Lingyu;Giurgiutiu, Victor
    • Smart Structures and Systems
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    • v.1 no.2
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    • pp.185-215
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    • 2005
  • Advanced signal processing techniques have been long introduced and widely used in structural health monitoring (SHM) and nondestructive evaluation (NDE). In our research, we applied several signal processing approaches for our embedded ultrasonic structural radar (EUSR) system to obtain improved damage detection results. The EUSR algorithm was developed to detect defects within a large area of a thin-plate specimen using a piezoelectric wafer active sensor (PWAS) array. In the EUSR, the discrete wavelet transform (DWT) was first applied for signal de-noising. Secondly, after constructing the EUSR data, the short-time Fourier transform (STFT) and continuous wavelet transform (CWT) were used for the time-frequency analysis. Then the results were compared thereafter. We eventually chose continuous wavelet transform to filter out from the original signal the component with the excitation signal's frequency. Third, cross correlation method and Hilbert transform were applied to A-scan signals to extract the time of flight (TOF) of the wave packets from the crack. Finally, the Hilbert transform was again applied to the EUSR data to extract the envelopes for final inspection result visualization. The EUSR system was implemented in LabVIEW. Several laboratory experiments have been conducted and have verified that, with the advanced signal processing approaches, the EUSR has enhanced damage detection ability.