• 제목/요약/키워드: Hwa-Byeong

검색결과 637건 처리시간 0.031초

부착식 PSC 텐던의 도입 긴장응력이 종진동 메카니즘에 미치는 영향 (Effect of Applied Tensile Stress of Bonded PSC Tendon on Longitudinal Vibration Mechanism)

  • 김병화;김수진;여금수;조승제
    • 한국전산구조공학회:학술대회논문집
    • /
    • 한국전산구조공학회 2011년도 정기 학술대회
    • /
    • pp.392-395
    • /
    • 2011
  • 본 논문은 부착식 PSC 텐던에 도입된 긴장응력이 종진동 메카니즘에 미치는 영향을 소개한다. 텐던의 종방향 변형과 비틀림 변형은 상호 연동하여 거동하고, 텐던에 도입된 긴장응력은 축강성과 비틀림 강성에 영향을 미친다. 따라서 텐던의 탄성파 속도는 도입된 긴장응력의 크기에 따라서 변한다. 실험적 검증을 위하여 도입 긴장응력이 다른 6개의 부착식 PSC 시험체에 대한 종진동 실험이 수행되었다. 실험결과로부터 도입 응력과 탄성파 속도와의 역학적 관계를 확인하였으며, 기존 문헌의 실험결과와 비교하였다.

  • PDF

Tumoral Calcinosis in a Beagle Dog with Renal Disease

  • Kim, Sung-Gu;Kim, Jong-Min;Park, Jin-Uk;Kim, Ji-Hye;Han, Tae-Sung;Ahn, Byeong-Woo;Na, Ki-Jeong;Choi, Seok-Hwa;Kim, Gon-Hyung
    • 한국임상수의학회:학술대회논문집
    • /
    • 한국임상수의학회 2009년도 추계학술대회
    • /
    • pp.217-217
    • /
    • 2009
  • PDF

단상 유도형 동기 전동기의 Cost 저감 설계 (Cost Reduction Design in Single-phase Line-start Permanent Magnet Motor)

  • 이병화;남혁;이정종;방량;홍정표;하승형
    • 전기학회논문지
    • /
    • 제57권12호
    • /
    • pp.2208-2212
    • /
    • 2008
  • This paper deals with the cost reduction design of a single-phase line-start permanent magnet(LSPM) motor. Due to high cost of the permanent magnet(PM), cost reduction can be effectively achieved by reducing PM volume. Therefore, motor characteristics according to the PM volume are calculated by using d-q axis equivalent circuit analysis, and the characteristic map is made. In the characteristic map, maximum torque and efficiency are shown according to motor parameters such as back electromotive force(back emf) and inductances; back emf represents the PM volume. Minimum back emf and inductances satisfying output performance are determined in the characteristic map. Then, motor geometry based on the prototype motor is optimized to get the determined parameters using response surface methodology(RSM) and finite element method(FEM). Through the presented cost reduction design, total PM volume is reduced to 32% of prototype model.

사물인터넷과 PPG기반의 사용자 인증 시스템 (A User Authentication System based on Internet of Things and PPG)

  • 정재화;주우경;김병만
    • 한국정보처리학회:학술대회논문집
    • /
    • 한국정보처리학회 2016년도 춘계학술발표대회
    • /
    • pp.660-662
    • /
    • 2016
  • 최근 생체 인식이 도입된 스마트폰, 태블릿, 웨어러블 디바이스들의 수요가 증가함에 따라 생체를 이용한 인식 등에 대한 연구가 활발히 진행되고 있다. 이에 본 논문에서는 사물인터넷과 PPG(광용적맥파)를 사용한 사용자의 인증 시스템을 제안하였다. 제안 시스템은 아두이노에 연결된 PPG센서를 통하여 PPG신호를 측정하여 측정한 신호를 서버로 보내게 된다. 서버에서는 이 신호로부터 특징점을 추출하여 기존에 학습된 정보를 바탕으로 K-NN 판별 알고리즘을 통하여 인증 절차를 거치게 된다. 실험결과, 제안 시스템은 평균 약 71.42%의 인식률을 보였다.

연속알고리듬을 이용한 연계선로의 송전운용한계 결정 (A Method of Determining the Maximum Interface Flow Limit Using Continuation Algorithm)

  • 김슬기;송화창;이병준;권세혁
    • 대한전기학회논문지:전력기술부문A
    • /
    • 제49권2호
    • /
    • pp.78-84
    • /
    • 2000
  • This paper introduces a method of determining the maximum real power transfer limit of interface lines, which connect two areas of a power system, using locally parameterized continuation algorithm. This method traces the path of power flow solutions as interface flow is gradually increased under a certain load demand condition and finds the steady state voltage stability limit, the interface flow limit. Voltage stability index is used to indicate how close the maximum limit is reached. Also, this study presents a procedure to determine the security-constrained interface flow limit using the above method. Contingency ranking index is proposed to identify the severity of contingencies. The case study is performed according to the suggested procedure.

  • PDF

Comparison of Vertical Magnification Ratio among Various Areas in Panoramic Radiographs

  • Song, Woong-Kyu;Seok, Hwa-Suk;Kim, Byeong-Rin;Choi, Seong-Ho
    • Journal of Korean Dental Science
    • /
    • 제10권2호
    • /
    • pp.53-59
    • /
    • 2017
  • Purpose: The objective of the present article is to determine whether there are differences in vertical enlargement ratio among various sites within both jaws in a panoramic radiograph. Materials and Methods: Two hundred and seventy-threeimplant sites in panoramic radiographs were evaluated by two observers. Magnification ratios at various sites in both jaws were calculated and compared with each other. Result: The average vertical enlargement ratio in the panoramic radiograph was 1.264 and this value was larger than original ratio 1.250. Although vertical magnification ratio of maxillary molar area was higher than that of mandibular molar area, every group showed similar magnification ratio in clinical respect. Conclusion: Vertical magnification ratio of the maxillary molar area is statistically higher than that of the mandibular molar area in the panoramic radiograph, but it is clinically negligible.