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Integrated Vehicle Mass Estimation Using Longitudinal and Roll Dynamics
Daeil Kim,Seibum B. Choi,Jiwon Oh 제어로봇시스템학회 2012 제어로봇시스템학회 국제학술대회 논문집 Vol.2012 No.10
Information of vehicle mass is crucial for vehicle safety control. Vehicle mass value is treated as a constant value for ESP(Electronic Stability Program) and other vehicle safety controls, but it varies with the number of passengers or the weight of load vehicle carries. This paper suggests an integrated mass estimation algorithm based on a recursive least square method and parameter adaptation. First, using the longitudinal dynamics and recursive least square method, the mass estimation algorithm is designed. Second, two sorts of mass estimation algorithms are designed using the roll dynamics. The first algorithm is designed using adaptation law from roll angle observer and Lyapunov stability analysis and the second algorithm is designed using recursive least square method. Then, mass estimation algorithm is finally integrated with two algorithms to estimate vehicle mass for all sorts of situations. The simulation results through CarSim and Matlab/Simulink show the performance of the proposed vehicle mass estimation algorithm.
Effect of the Cu Bottom Layer on the Optical and Electrical Properties of In₂O₃/Cu Thin Films
Daeil Kim(김대일) 한국진공학회(ASCT) 2011 Applied Science and Convergence Technology Vol.20 No.5
유리 기판 위에 RF와 DC 마그네트론 스퍼터링 방법으로 100 ㎚ 두께의 In₂O₃ 단층 박막과 In₂O₃ 100 ㎚/Cu 3 ㎚의 두께를 갖는 적층박막을 증착하고, 구리 기저 층 증착에 따른 상부 In₂O₃ 박막의 광학적, 전기적 특성의 변화를 연구하였다. 상온에서 증착 된 In₂O₃ 박막의 가시광 투과도와 면 저항은 79%와 2,300 Ω/□이었다. 구리 기저 층의 광 흡수에 의하여, In₂O₃/Cu 적 층박막의 가시광 투과도는 71%로 감소하였으나, 면 저항은 110 Ω/□로 측정되어 상대적으로 우수한 전기적 특성을 구할 수 있었다. 본 연구에서 Figure of Merit 분석을 통하여 구리 기저 층이 상부 In₂O₃ 투명전극의 전기적, 광학적 특성을 개선 할 수 있음을 확인하였다. Indium oxide (In₂O₃) single layer and In₂O₃/copper (Cu) bi-layer films were prepared on glass substrates by RF and DC magnetron sputtering without intentional substrate heating. In order to determine the effect of the Cu bottom layer on the optical, electrical and structural properties of In₂O₃ films, 3-㎚-thick Cu film was deposited on the glass substrate prior to deposition of the In₂O₃ films. As-deposited In2O3 films had an optical transmittance of 79% in the visible wavelength region and a sheet resistance of 2,300 Ω/□, while the In₂O₃/Cu film had optical and electrical properties that were influenced by the Cu bottom layer. In₂O₃/Cu films had a lower sheet resistance of 110 Ω/□ and an optical transmittance of 71%. Based on the figure of merit, it can be concluded that the Cu bottom layer effectively increases the performance of In2O3 films for use as transparent conducting oxides in flexible display applications.
Webized 3D experience by HTML5 annotation in 3D Web
Daeil Seo(서대일),Byounghyun Yoo(유병현),Heedong Ko(고희동) (사)한국CDE학회 2015 한국 CAD/CAM 학회 학술발표회 논문집 Vol.2015 No.하계
With the development of 3D Web technologies, 3D objects are now handled as embedded objects without plug-ins on web pages. Although declarative 3D objects are physically integrated into web pages, 3D objects and HTML elements are still separated from the perspective of the 3D layout context, and an annotation method is lacking. Thus it is scarcely possible to add meaningful annotations related to target 3D objects using existing web resources. In addition, people often lose the relationship between the target and related annotation objects in a 3D context due to the separation of the content layouts in different 3D contexts. In this paper, we propose a webizing method for annotating user experiences with 3D objects in a 3D Web environment. The relationship between the 3D target object and the annotation object is declared by means of web annotations and these related objects are rendered with a common 3D layout context and a camera perspective. We present typical cases of 3D scenes with web annotations on the 3D Web using a prototype implementation system to verify the usefulness of our approach.