http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 저자 : 김영기(Kim, Young Gi) (검색결과 1,011 건)
- 무료
- 기관 내 무료
- 유료
-
초음파 tomography를 응용한 콘크리트 구조물의 비파괴 시험에 관한 연구
김영기,윤영득,윤종열,김정수,김운경,송문호,Kim, Young-Ki,Yoon, Young-Deuk,Yoon, Chong-Yul,Kim, Jung-Soo,Kim, Woon-Kyung,Song, Moon-Ho 대한전자공학회 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.1
As a potential approach for non-destructive testing of concrete structures, we evaluate the time-of-flight (TOF) ultrasound tomography technique In conventional X ray tomography, the reconstructed Image corresponds to the internal attenuation coefficient However, in TOF ultrasound tomography, the reconstructed Image is proportional to the retractive index of the medium Because refractive effects are minimal for X-rays, conventional reconstruction techniques are applied to reconstruct the Image in X-ray tomography However, since ultrasound travels in curved path, due to the spatial variations in the refractive index of the medium, the path must be known to correctly reconstruct the Image. Algorithm for determining the ultrasound path is developed from a Geometrical Optics point view and the image reconstruction algorithm, since the paths are curved It requires the algebraic approach, namely the ART or the SIRT Here, the difference between the computed and the measured TOP data is used as a basis, for the iteration process First the initial image is reconstructed assuming straight paths. It then updates the path based on the recently reconstructed image This process of reconstruction and path determination repeats until convergence The proposed algorithm is evaluated by computer simulations, and in addition is applied to a real concrete structure. 본 연구에서는 초음파와 tomography 기법을 기반으로 콘크리트 구조물의 비파괴 시험에 대한 방법론을 정립하고 검증하였다 일반적인 X-ray tomography에서는 물체를 통과하는 파동의 감쇠(attenuation) 데이터에 기초를 두고있는 반면에, 본 연구에서는 time-of-flight(TOF) 데이터를 사용하여 매질의 굴절률(refractive index)을 포괄적으로 표현하는 단층영상을 복원한다 X-ray tomography에서는 측정된 감쇠 데이터를 영상복원(Image reconstruction) 알고리즘에 의해서 처리하며, 파동의 굴절은 고려할 필요가 없다 그러나 초음파는 매질(medium)의 굴절률(refractive index)에 따라 초음파의 경보가 변경되므로 초음파 tomography에서는 초음파 경로의 연산이 선행되어야만 단층영상을 복원할 수 있게 된다 초음파 정보의 연산은 가하광학(Geometrical Optic)에서 사용되는 굴절률과 경로의 관계에 기초를 둔다 영상 복원은 대수학적 접근 방법인 ART (algebraic reconstruction technique) 또는 SIRT(simultaneous iterative reconstruction technique)를 기초로 연산된 초음파의 경로를 따라 선적분한 TOF 값과 측정된 TOF 값의 차이를 기반으로 수행된다 실제 구현에서는 초음파가 직진한다는 가정하에 영상을 복원하고, 이를 기반으로 초음파의 경로를 연산하였다 본 논문에서는 이들 두 과정(경로연산 및 영상복원)의 반복연산을 통하여 영상을 복원하였다. 세안하는 알고리즘을 모의실험으로 평가하였고, 실제 콘크리트 구조물에 적용하여 본 방법론의 무한한 가능성을 입증하였다.
-
-
-
Immuno-strip biosensor system to detect enrofloxacin residues
김영기,Hajin Kim 한국공업화학회 2009 Journal of Industrial and Engineering Chemistry Vol.15 No.2
The immuno-strip biosensor was developed by combination of immuno-chromatography assay and sandwich enzyme linked immunosorbent assay (ELISA) techniques to detect enrofloxacin, a widely used broad-spectrum antibiotic. A proposed analytical system, consisted of immuno-reaction step and enzyme reaction step, has several advantages such as a very cheap manufacturing cost, a short analysis time (approximately 20 min), an easy-to-use, a high sensitivity, and a qualitatively confirmation by bare eyes. Enzyme reaction step in a proposed analytical tool could enhance the signal of immunosensor, resulting in the high sensitivity. A proposed system was successfully applied to detect enrofloxacin in a range of 100–10000 ppb. The lower detection limit was 100 ppb, which is themaximum residue limit of enrofloxacin in animal product. 2009 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
-
고속 입자 충격을 도입한 AC PDP의 MgO 보호층 형성에 관한 연구
김영기,박정태,고광식,김규섭,조정수,박정후,Kim, Young-Kee,Park, Jung-Tae,Ko, Kwang-Sik,Kim, Gyu-Seob,Cho, Jung-Soo,Park, Chong-Hoo 대한전기학회 2000 전기학회논문지C Vol.52 No.10
The performance of ac plasma display panels (PDP) is influenced strongly by the surface glow discharge characteristics on the MgO thin films. This paper deals with the surface glow discharge characteristics and some physical properties of MgO thin films prepared by reactive RF planar unbalanced magnetron sputtering in connection with ac PDP. The samples prepared with dc bias voltage of -10V showed lower discharge voltage and lower erosion rate byion bombardment than those samples prepared by conventional magnetron sputtering or E-beam evaporation. The main factor that improves the discharge characteristics by bias voltage is considered to be due to the morphology changes or crystal structure of the MgO thin film by ion bombardement during deposition process.
-
김영기,박성택,이승준,Kim, Young-Ki,Park, Seong-Taek,Lee, Seung-Jun 한국디지털정책학회 2008 디지털융복합연구 Vol.6 No.2
The remarkable growth of the Internet since mid-l990s has expanded the e-learning market and brought the transformation of educational environments and methodology. It can be said that the e-learning has changed the educational paradigm. Korean government is firmly determined to support the diffusion of e-learning because of the benefits of e-learning. People seem to accept the e-learning when its contents have high quality. A lot of research have been conducted on e-learning, however, it was mostly about user's usage intention, satisfaction and educational effect. It can't seem that sufficient research efforts have been put into figuring out the role of e-learning contents quality in the expansion of e-learning. In this paper, we present the empirical study on the influence of e-learning contents quality on user's satisfaction and educational effect. We conducted an questionnaire survey on college students to collect data and found that the quality of e-learning contents has significant influence on the users' satisfaction.
-
-
-
김영기,Kim, Yeong-Gi 한국화재보험협회 1991 防災와 保險 Vol.51 No.-
특수재료 가스의 화재와 일반 가스의 화재 성상을 비교할 때 전자는 자연발화성 가스 또는 독성 가스가 많은 것이 특징이다. 이러한 가스의 화재를 예방하기 위해서는 우선 누설 및 화재의 방지대택을 연구 검토하여야 하며 특히 수송이나 저장시 각별한 주의를 기울이지 않으면 안된다.
-
Patent Valuation for Fair Royalty Distribution in Patent Pool
김영기,박성택,이승준,Kim, Young-Ki,Park, Seong-Taek,Lee, Seung-Jun The Society of Digital Policy and Management 2010 디지털융복합연구 Vol.8 No.1
In this paper, we discuss patent pool and a patent valuation scheme for fair royalty distribution among the patents in a pool. In the knowledge-based economy, intellectual capital-the accumulation of technology and know-how-is recognized as the most important source of company's competitive advantage and economic growth. By providing exclusive rights to patent holders, the patent system aims to encourage innovation-invention & commercialization of new technologies-in order to raise the standard of living. However, drawbacks of patent system, which occur as the number of patents issued increases rapidly and patent ownership is fragmented, may slow down the innovation efforts seriously. A promising solution is the patent pool approach, which was for instance employed by the U.S. congress during World War I to free the airplane manufacturers from the patent tangle by letting them license all the patents for a fee. It is necessary to figure out relative technological contribution of patent for fair distribution of royalty revenues among patent holders. The Rating/Ranking Method seems to fit to that valuation purpose. We examined technology valuation models from various organizations and selected a set of more influential valuation factors which can be incorporated as scoring criteria in the Rating/Ranking Method.
eArticle연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
