期刊：
PROCEEDINGS OF THE 26TH INTERNATIONAL CONFERENCE ON NUCLEAR ENGINEERING, 2018, VOL 1,2018年1
通讯作者：
Liu, Hua
作者机构：
[Liu, Hua; Li, Meng; Liu, Zhao-hui; Yang, Xiao-Hua] Univ South China, CNNC Key Lab High Trusted Comp, Hengyang, Peoples R China.;[Chen, Zhi] Nucl Power Inst CHINA, Chengdu, Sichuan, Peoples R China.;[Zhao, Qing; Feng, Zhigang] Univ South China, Sch Elect Engn, Heng Yang City, Hunan, Peoples R China.
通讯机构：
[Liu, Hua] U;Univ South China, CNNC Key Lab High Trusted Comp, Hengyang, Peoples R China.
会议名称：
26th International Conference on Nuclear Engineering (ICONE-26)
会议时间：
JUL 22-26, 2018
会议地点：
London, ENGLAND
会议主办单位：
[Liu, Hua;Yang, Xiao-Hua;Liu, Zhao-hui;Li, Meng] Univ South China, CNNC Key Lab High Trusted Comp, Hengyang, Peoples R China.^[Chen, Zhi] Nucl Power Inst CHINA, Chengdu, Sichuan, Peoples R China.^[Feng, Zhigang;Zhao, Qing] Univ South China, Sch Elect Engn, Heng Yang City, Hunan, Peoples R China.
关键词：
Digital instrument control platform;Information security;Vulnerability analysis;Security loophole
摘要：
Dynamically measuring rail profile using the structured-light vision suffers from random vibrations on the line laser projector, which would cause distorted rail profiles. This paper presents a simple and effective distortion rectifying method to address this issue. The distorted rail profile is rectified by easily projecting it onto an auxiliary plane which is parallel to the cross section of rail. In order to establish the auxiliary plane, three profiles formed by radiating multiline structured light on rail are used to fit the rail longitudinal axis. More importantly, only one of the light planes is required to be calibrated beforehand. The others are calibrated online with the proposed self-calibration method, which is based on collinearity and parallelity constraints on the scene points of different rail profiles and requires only one image of the scene. Apart from evaluating the implementation with comprehensive experiments, we compare our method against other published works. The results exhibit its effectiveness and superiority in terms of the dynamic measurement of the rail profile.
摘要：
Structured-light vision (SLV) is a standard approach for inspecting rail wear. However, it is incompetent for dynamic inspection due to the random vibrations in the line laser projector. In this paper, a three-step distortion rectifying method is introduced to address this issue. Given an image with two rail profile stripes, the first step involves parallelity constraint-based establishment of an auxiliary plane whose normal vector is parallel with the rail longitudinal axis. The establishment is only dependent on the intrinsic camera parameters, which improves the robustness of the auxiliary plane to the random vibrations in the line laser projector. In step two, this auxiliary plane is utilized for the autonomous calibration of the line structured lights. The proposed self-calibration is achieved by minimizing the point set mapping errors on triple matching primitives such as rail jaw, railhead inner, and rail foot and requires only two laser stripes. After these two steps, two rail profiles are reconstructed from the double-line SLV without known poses, and the distorted one is projected onto the auxiliary plane for distortion rectifying. It is able to deliver more precise rectifying than the parallel-line SLV and cross-line SLV, even if the inspecting task is performed dynamically. With the comprehensive experiments, we test our scheme and compare it with the related methods. The experimental results verify that the proposed method outperforms the previous works in terms of the accuracy and robustness for the dynamic wear inspection.
作者机构：
[刘华] School of Electrical Engineering, University of South China, Hengyang;Hunan;421001, China;[韩文兴; 陈智] Nuclear Power Institute of CHINA, Chengdu;610041, China
作者机构：
[Liu, Hua] Univ South China, Sch Elect Engn, Heng Yang City, Hunan, Peoples R China.;[Yan, Shiyu; Liu, Zhaohui; Yang, Xiaohua] Univ South China, CNNC Key Lab High Trusted Comp, Heng Yang City, Hunan, Peoples R China.;[Chen, Zhi] Nucl Power Inst CHINA, Chengdu, Sichuan, Peoples R China.
会议名称：
26th International Conference on Nuclear Engineering (ICONE-26)
会议时间：
JUL 22-26, 2018
会议地点：
London, ENGLAND
会议主办单位：
[Liu, Hua] Univ South China, Sch Elect Engn, Heng Yang City, Hunan, Peoples R China.^[Liu, Zhaohui;Yang, Xiaohua;Yan, Shiyu] Univ South China, CNNC Key Lab High Trusted Comp, Heng Yang City, Hunan, Peoples R China.^[Chen, Zhi] Nucl Power Inst CHINA, Chengdu, Sichuan, Peoples R China.
会议论文集名称：
Proceedings of the 2018 26th International Conference on Nuclear Engineering
摘要：
In the design phase of digital instrument control system, the reactor scram subsystem is a complex system that is constructed by hardware, software, system interaction and communication. So the single analysis method such as FMEA and FTA are all have limitations. FMEA and FTA are all based in the accident model with event chain. FTA is not suitable for the discovery of software and communication failures and other problems with high coupling degree, time series association, constraints of control. Three independent basic analysis methods, FMEA, FTA and STPA, are combined to form the statistical table of failure and failure coverage. For FMEA and FTA, the design safety problem detection rate is only 74.1% and 64% respectively for reactor scram subsystem. The detection rate of STPA for reactor SCRAM subsystem is up to 95.1%. Meanwhile, multiple method fusion can cover all the safety issues triggered by hardware, software, system interaction, and communication failure and defect. The analysis of this paper shows that multiple method fusion is better than single method. STPA method is superior to other single security analysis methods. STPA method can effectively make up for the inadequacy of FMEA and FTA method.
摘要：
Finite-difference time-domain (FDTD) method is employed to study the optical properties of a novel kind of periodic subwavelength hole arrays composed of Tai-chi-shaped holes in silver film, and the optical transmission properties of femtosecond optical pulse excitation is numerically calculated. We find that this Tai-chi-shaped device has better optical band-pass filtering properties, such as narrower pass band and higher transmissivity in visible wavelengths range, than other devices under consideration. Based on the generation of surface plasmons resonance mode in the dielectric-metal interface, the center wavelength of transmission can be tuned by changing the array periodicities. We observe that the tune ability mainly depends on the space period along the direction parallel to that of the incident pulse polarization. It is also found that both the strength and the wavelength of the transmission peaks of rectangularly distributed metal hole arrays are determined by the polarization of incident light. Additionally, we demonstrate the typical band-pass filtering properties of this Tai-Chi-shaped holes structure. The full-width at half-maximum (FWHM) of the narrow pass band is about 20 nm in visible wavelengths range. (C) 2014 Elsevier B.V. All rights reserved.
