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RESEARCH ON MILLIMETER WAVE RADAR SIMULATION MODEL FOR INTELLIGENT VEHICLE
Xin Li,Weiwen Deng,Sumin Zhang,Yaxin Li,Shiping Song,Shanshan Wang,Guanyu Wang 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.2
Radar simulation models can effectively overcome the drawbacks of real vehicle experiment and speed up the development process of intelligent vehicle technologies based on millimeter wave radar via virtual testing. However, there are still many gaps between the radar model using in the virtual driving environment and the real radar. In this paper, a novel simulation model of intelligent vehicle millimeter wave radar is proposed. Based on the analysis of the real radar performance in typical application scenes, the radar model considers the mechanism and characteristics of the vehicle radar synthetically and a systematic radar modeling architecture with innovation is introduced. The highlights of this radar model include the design of the RCS simulation model for radar targets with both high accuracy and real-time performance, the establishment of the quantitative false alarm model, missed detection model and measurement error simulation model. Vast amounts of data collected by real vehicle radar are applied to fetch model parameters and verify the accuracy of the radar model. Simulation results show that the proposed model can reach both high reliability and computational efficiency.
Local stereo matching using combined matching cost and adaptive cost aggregation
( Shiping Zhu ),( Zheng Li ) 한국인터넷정보학회 2015 KSII Transactions on Internet and Information Syst Vol.9 No.1
Multiview plus depth (MVD) videos are widely used in free-viewpoint TV systems. The best-known technique to determine depth information is based on stereo vision. In this paper, we propose a novel local stereo matching algorithm which is radiometric invariant. The key idea is to use a combined matching cost of intensity and gradient based similarity measure. In addition, we realize an adaptive cost aggregation scheme by constructing an adaptive support window for each pixel, which can solve the boundary and low texture problems. In the disparity refinement process, we propose a four-step post-processing technique to handle outliers and occlusions. Moreover, we conduct stereo reconstruction tests to verify the performance of the algorithm more intuitively. Experimental results show that the proposed method is effective and robust against local radiometric distortion. It has an average error of 5.93% on the Middlebury benchmark and is compatible to the state-of-art local methods.
유춘리,( Li Shiping ) 한국공업화학회 2020 한국공업화학회 연구논문 초록집 Vol.2020 No.-
In this study, layered V<sub>2</sub>O<sub>5</sub>@layered-ZnV<sub>2</sub>O<sub>6</sub> nanostructures were synthesized using a hydrothermal method followed with heat treatment. The heat treatment temperature has been varied to optimize the composition and CO<sub>2</sub> reduction efficient. Characterization results demonstrate that an optimized CO generation rate of 6.15 μmolg<sup>-1</sup>h<sup>-1</sup> with an approximate stoichiometric O<sub>2</sub> evolution can be achieved from V<sub>2</sub>O<sub>5</sub>@ ZnV<sub>2</sub>O<sub>6</sub> under simulated solar light irradiation, as well as relatively good selectivity and stability. The performance of optimized V<sub>2</sub>O<sub>5</sub>@ZnV<sub>2</sub>O<sub>6</sub> for CO production was 3.53 folds higher than using pure ZnV<sub>2</sub>O<sub>6</sub> sample. This reveals that ZnV2O6 nanosheets not only allow the transfer of electrons towards CO<sub>2</sub> but also provide short pathways for electron transfer, which leads to the enhanced photoactivity. In addition, V<sub>2</sub>O<sub>5</sub> presents in the sample further contribute to enhance performance of ZnV<sub>2</sub>O<sub>6</sub> hierarchical nanosheets due to enabling efficient charge carrier separation.
Shichang Li,Shiping Yin,Yu Gao 한국콘크리트학회 2020 International Journal of Concrete Structures and M Vol.14 No.4
As a type of cement-based composite reinforcement material, textile reinforced concrete (TRC) has the advantages of corrosion resistance, high bearing capacity and good crack limit performance. Its bonding performance with the existing concrete interface is the key factor affecting the reinforcement effect. To study the interfacial adhesion between TRC and existing concrete, the sodium chloride concentration, the frequency and number of dry and wet cycles, the bonding length of the TRC reinforcement layer and the type of reinforcement were analysed by a double-sided shear test, XRD (X-ray diffraction) and SEM (scanning electron microscope) micro-test techniques. The influence of other factors on the interfacial bonding properties was further elaborated based on the theory of fracture energy. The results show that interface damage under chloride attack was mainly divided into three typical interface failure modes. By increasing the concentration of sodium chloride, reducing the frequency of dry and wet cycles and increasing the number of dry and wet cycles, the interface microstructure damage could be aggravated. Using cast-in-place reinforcement and increasing the bonding length could enhance the bonding performance of the interface.
NONDESTRUCTIVE MEASUREMENT SYSTEM FOR WELDING RESDIUAL STRESS BY ULTRASONIC METHOD
ZHANG Shiping,LI Ying,SUN Jinwei,FANG Hongyuan 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Residual stresses are one of the most important challenges to the safety of parts and structures. Considering the disadvantages of the traditional measurement of residual stress which are time-consuming, consumption, destruction, huge volume??Ultrasonic stress measurement installation is improved to meet the measurement of thin wall welded structure. The acoustical theory is introduced. Ultrasonic stress measurement experimental installation is designed. The longitudinal residual stress and transverse residual stress of twin wire welded plate are measured by the proposed system. The result of the ultrasonic method is verified by laser hologram interference hole-drilling method and finite element method. The measurement process by Ultrasonic method is not only nondestructive, but also real-time.
Real-Time Tracking Algorithm for Moving Target Based on Dynamic Monitoring Video
Chaoxiang Chen,Wenshu Li,Shiping Ye,Huafeng Chen 보안공학연구지원센터 2016 International Journal of Multimedia and Ubiquitous Vol.11 No.9
Target tracking algorithm is a key technical problem in the computer version field, and the existing algorithms are mainly based on the stationary camera platform. Therefore, a real-time tracking algorithm for moving target based on dynamic monitoring video is proposed in this article. Firstly, the feature points are screened according to the influence of the moving target on the light streams; secondly, the light stream method is adopted to estimate the global motion of the camera; finally, the motion equation of the particle filter is modified according to the global motion estimation result and meanwhile the color histogram is selected as the characteristic model of the target, thus to track the moving target. The experiment result shows that the particle filter algorithm can rapidly and accurately track the moving target during camera motion process to meet the real-time requirement, and has excellent robustness.
First principles calculation of boron diffusion in fcc-Fe
Xin Zhang,Xianglong Li,Ping Wu,Sen Chen,Shiping Zhang,Ning Chen,Xiulan Huai 한국물리학회 2018 Current Applied Physics Vol.18 No.10
The diffusion mechanism of boron in fcc-Fe was studied by first-principles calculations. The sites where B atoms tend to occupy and the diffusion behavior were calculated. Results indicated that the main mechanism of boron diffusion in fcc-Fe was the B–monovacancy complex mechanism instead of the interstitial mechanism. The diffusion coefficient D1 of the B–monovacancy complex mechanism was calculated without considering the backward jump of the B atoms. The calculated D1=1.26×10−4×exp(–2.01eV/kBT) m2·s−1 is consistent with the reported results from experiments.
유춘리,( Yuefa Jia ),( Shiping Li ),( Daryll J Dalayoan ) 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.1
NO have been a primary cause of air pollution, and it is important to find efficient and economical ways to remove NO from the atmosphere. (BiO)<sub>2</sub>CO<sub>3</sub> (BOC) and BiO<sub>2</sub>-x are both emerging Bi-based semiconductor photocatalysts. In this report, Z-scheme (BiO)<sub>2</sub>CO<sub>3</sub>-BiO<sub>2</sub>-xgraphene (BOC-BiO<sub>2</sub>-x-GR) composite photocatalyst was designed for NO removal under simulated solar light irradiation. Through the optimization of the BiO<sub>2</sub>-x content, we observed that the BOC-BiO<sub>2</sub>-x (35wt%)-GR composite exhibited superior photocatalytic activities in NO removal. Detailed microstructural observation showed that the BOC-BiO<sub>2</sub>-x heterojunction was formed between BOC (013) and BiO<sub>2</sub>-x (111) planes. Theoretical calculations confirmed that the BOC and BiO<sub>2</sub>-x heterojunction favors the transfer of photo-generated electrons, which can be further enhanced by highly conductive GR sheets. O<sub>2</sub>ㆍ- and HOㆍ were observed through the ESR measurements as the main active species.