• Title/Summary/Keyword: JIC

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Rheology properties of mortar using mineral admixture (광물질 혼화재를 혼합한 모르타르의 유변학적 특성)

  • Kim, Yong-Jic;Kim, Young-Jin;Choi, Yun-Wang
    • Proceedings of the Korea Concrete Institute Conference
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    • 2010.05a
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    • pp.341-342
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    • 2010
  • This paper presents rheology of mortar using mineral admixture(Ground granulated blast furnace slag and Fly ash). The measurement of the rheology of mortar, including viscosity and yield stress, as well as its compressive strength were also carried our.

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Joule-heating induced crystallization (JIC) of amorphous silicon films

  • Hong, Won-Eui;Lee, Joo-Yeol;Kim, Bo-Kyung;Ro, Jae-Sang
    • 한국정보디스플레이학회:학술대회논문집
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    • 2007.08a
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    • pp.459-462
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    • 2007
  • An electric field was applied to a conductive layer to induce Joule heating in order to carry out the crystallization of amorphous silicon. Polycrystalline silicon was produced through a solid state transformation within the range of a millisecond. Uniformly distributed grains were obtained due to enormously high heating rate.

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Utilizing Mobile Phones for m-Iearning (휴대폰을 이용한 m-learning 구현)

  • Lee, Kyunm-Jic;Ryu, Sang-Hoon
    • Annual Conference of KIPS
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    • 2006.11a
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    • pp.641-644
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    • 2006
  • e-learning에서 m-learning으로 진행함에 따라 기존에 사용하던 PDA, Notebook 이 아닌 일반 사용자들이 대부분 가지고 있는 휴대폰을 학습도구로 이용, 다양한 형식의 e-learning contents를 m-learning contents로 변환 활용하기 위하여 화면 capture 기법을 활용하고 무선통신망을 배제하고 유선통신망을 이용하여 서비스 할 수 있는 모델을 제시한다.

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Effect of Temperature on the Fracture Toughness of A516 Gr70 Steel

  • Seok, Chang-Sung
    • Journal of Mechanical Science and Technology
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    • v.14 no.1
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    • pp.11-18
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    • 2000
  • Fracture toughness JIC and KIC tests were performed on A516 Gr70 carbon steel plate at the temperature ranging from -$160^{\circ}C$ to $600^{\circ}C$, and test results were analyzed according to ASTM E 813 and ASTM E 399. Unloading compliance J-integral tests were performed on 1TCT specimens. The relation between the $J_{IC}$ value and the test temperature was obtained. It was concluded that the temperature ranging from $-15^{\circ}C$ to $600^{\circ}C$ is the upper shelf region of ductile-brittle transition temperature, and in this temperature range, fracture toughness $J_{IC}$ values decreased with increasing temperature. The ductile brittle transition temperature of the material may be around $-30^{\circ}C$. In the region near $-30^{\circ}C$, the tendency of $J_{IC}$ to decrease with decreasing temperature was significant.

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Analysis of pitch static attitude (열 보조 자기기록용 서스펜션의 PSA 에 대한 분석)

  • Park, Kyoung-Su;Kim, Ki-Hoon;Lee, Yong-Hyun;Kim, Seok-Wan;Lee, Sang-Jic;Park, No-Cheol;Park, Young-Pil
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2009.10a
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    • pp.519-523
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    • 2009
  • This paper presents the analysis of pitch static attitude (PSA) in thermally assisted magnetic recording (TAMR) suspension. The TAMR suspension using an optical fiber has high stiffness such as vertical, pitch and roll. Therefore, P-torque is greatly increased by the optical fiber. Also, flying height (FH) of the slider with TAMR suspension can be largely changed by PSA. In this paper, we focus on the FH by PSA of TAMR suspension. The FH is investigated using various PSA and proper PSA is proposed.

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Unit Under Tester Auto System using OCR(Optical Character Recognition) (Optical Character Recognition을 이용한 계측기기 자동 교정시스템구축기술)

  • Kang, Sang-Mu;Kim, Young-Jic;Cheon, Yong-Sik
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1772-1773
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    • 2011
  • 현대기술의 발전에 따라 계측기술 또한 다양하고 복잡하게 변모하였으며, 정밀측정기기의 교정 업무에서는 복잡하고 정확한, 반복적이며 계속적인 데이터 취득을 요구한다. 또한 여러 장비를 사용할 경우, 장시간 소요되는 데이터 취득과 정확한 계측기 사용법 및 고도의 관련기술을 필요로 한다. 그러므로 컴퓨터를 이용 한 계측장비 제어로 측정에 필요한 시간을 최대한 단축하고, 개인오차를 제거할 수 있는 동일한 결과와 쉽게 데이터를 취득할 수 있도록 측정자동화가 필요하다.

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A Case Study of the Improvement of the Acoustics of a Traditional Music Hall according to the Acoustical Guideline of the Traditional Music (국악공연장 음향설계기준에 따른 음향개선 사례연구)

  • Shin Jic-Su;Lee Wangu;Haan Chan-Hoon
    • Proceedings of the Acoustical Society of Korea Conference
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    • spring
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    • pp.245-250
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    • 2004
  • 본 연구는 국립국악원 우면당의 개보수공사에 있어서 새로이 변경되는 객석의 형태와 규모 및 목적에 맞는 최적의 실내음향설계를 제시하기 위하여 현재의 우면당 실내음향의 문제점을 파?하고 설계된 도면을 기초로 하여 과학적으로 분석, 평가함으로서 국악공연에 적합한 최적의 음향성능을 창출하고 이에 따른 실내마감 자재 및 설계, 시공방법 등을 제시하였다. 또한 시공후 음향성능에 대한 평가작업을 시행하여 시공전과 비교함으로서 그 개선의 결과를 검증하였다.

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