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    Wyświetlanie 1-8 z 8
    Tytuł:
    Analysis of the influence of warning sounds in expressway tunnels on the mental state and attention of the driver
    Autorzy:
    Xiao, Yao
    Liang, Bo
    Wang, Tao
    Niu, Jiaan
    He, Shiyong
    Powiązania:
    https://bibliotekanauki.pl/articles/27312133.pdf
    Data publikacji:
    2023
    Wydawca:
    Polska Akademia Nauk. Czasopisma i Monografie PAN
    Tematy:
    dźwięk ostrzegawczy
    tunel
    droga ekspresowa
    kierowca
    stan psychiczny
    charakterystyka wizualna
    warning sound
    expressway
    tunnel
    driver
    mental state
    visual characteristic
    Opis:
    In recent years, some expressway tunnels have started broadcasting warning sounds, such as fire alarms, to improve driver attention and traffic safety. However, there is few research on it, and in contrast to previous studies, we have considered different evaluation indices and through field measurement to determine the effectiveness of this practice. The characteristics of three warning sound signals, i.e., fire alarm, dynamic music, and voice command, in a tunnel were analyzed using MATLAB. Considering pupil diameter and blink duration as evaluation indexes, the change in the mental state of the driver after hearing a warning sound was analyzed. Based on Markov chain theory, the change in the gaze region and gaze shift of the driver under the condition of a warning sound was analyzed. Results shows fire alarms and voice commands can increase the mental load of drivers, but the degree of impact was not determined. Dynamic music does not affect the mental load of the driver. The fire alarm and dynamic music attracted the attention of the driver; conversely, as the voice command warns the driver to focus on safety, it did not impact the attention of the driver. The research results provide a scientific reference for the selection of warning sounds in expressway tunnels and new research ideas for the prevention of traffic injuries in expressway tunnels.
    Źródło:
    Archives of Civil Engineering; 2023, 69, 2; 623--636
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Application of fractional calculus in iterative sliding mode synchronization control
    Autorzy:
    Zhang, Xin
    Wen-Ru, Lu
    Zhang, Liang
    Xu, Wen-Bo
    Powiązania:
    https://bibliotekanauki.pl/articles/141629.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    cross-coupling control
    fractional calculus
    iterative learning control
    PD control
    robot arm
    sliding mode control
    Opis:
    In order to control joints of manipulators with high precision, a position tracking control strategy combining fractional calculus with iterative learning control and sliding mode control is proposed for the control of a single joint of manipulators. Considering the coupling between joints of manipulators, a fractional-order iterative sliding mode crosscoupling control strategy is proposed and the theoretical proof of its progressive stability is given. The paper takes a two-joint manipulator as the research object to verify the control strategy of a single-joint manipulator. The results show that the control strategy proposed in this paper makes the two-joint mechanical arm chatter less and the tracking more accurate. The synchronous control of the manipulator is verified by a three-joint manipulator. The results show that the angular displacement adjustment times of the threejoint manipulator are 0.11 s, 0.31 s and 0.24 s, respectively. 3.25 s > 5 s, 3.15 s of a PD cross-coupling control strategy; 2.85 s, 2.32 s, 4.22 s of a PD iterative cross-coupling control strategy; 0.14 s, 0.33 s, 0.28 s of a fractional-order sliding mode cross-coupling control strategy. The root mean square error of the position error of the designed control strategy is 6.47 × 10−6 rad, 3.69 × 10−4 rad, 6.91 × 10−3 rad, respectively. The root mean square error of the synchronization error is 3.96×10−4 rad, 1.36×10−3 rad, 7.81×10−3 rad, superior to the other three control strategies. The results illustrate the effectiveness of the proposed control method.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 499-519
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Calculation model and analysis for lay-by spacing in highway tunnel
    Autorzy:
    Liang, Bo
    Xiao, Yao
    Powiązania:
    https://bibliotekanauki.pl/articles/2174089.pdf
    Data publikacji:
    2022
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Opis:
    Tunnel lay-by spacing is directly related to traffic safety and engineering investment. Nevertheless, its mechanism is not clear, and the rationality of the exiting norms with respect to tunnel lay-by spacing needs to demonstrate. A calculation model for tunnel lay-by spacing was derived by considering the headway and the physical kinematics of the two vehicles chasing and encountering. With it, the influence of various parameters on lay-by spacing were analysed and the rationality of the model were discussed through comparing with existing norms. Results shows longitudinal gradient rate, daily average traffic flow, rolling resistance coefficient, posted speed limit are significant to determine the lay-by spacing, and the most important parameter is longitudinal gradient rate. Existing tunnel lay-by spacing norm values are not reasonable enough, either too strict or too loose. These findings provide scientific support for how to select tunnel lay-by spacing value, which can improve tunnel traffic safety and make engineering investment reasonable.
    Źródło:
    Archives of Civil Engineering; 2022, 68, 4; 347--357
    1230-2945
    Pojawia się w:
    Archives of Civil Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Cooperative adaptive driving for platooning autonomous self driving based on edge computing
    Autorzy:
    Chang, Ben-Jye
    Hwang, Ren-Hung
    Tsai, Yueh-Lin
    Yu, Bo-Han
    Liang, Ying-Hsin
    Powiązania:
    https://bibliotekanauki.pl/articles/330778.pdf
    Data publikacji:
    2019
    Wydawca:
    Uniwersytet Zielonogórski. Oficyna Wydawnicza
    Tematy:
    mobile edge computing
    active safe driving
    cooperative platoon driving
    cooperative adaptive cruise control
    przetwarzanie mobilne
    bezpieczna jazda
    tempomat adaptacyjny
    Opis:
    Cooperative adaptive cruise control (CACC) for human and autonomous self-driving aims to achieve active safe driving that avoids vehicle accidents or traffic jam by exchanging the road traffic information (e.g., traffic flow, traffic density, velocity variation, etc.) among neighbor vehicles. However, in CACC, the butterfly effect is encountered while exhibiting asynchronous brakes that easily lead to backward shock-waves and are difficult to remove. Several critical issues should be addressed in CACC, including (i) difficulties with adaptive steering of the inter-vehicle distances among neighbor vehicles and the vehicle speed, (ii) the butterfly effect, (iii) unstable vehicle traffic flow, etc. To address the above issues in CACC, this paper proposes the mobile edge computing-based vehicular cloud of the cooperative adaptive driving (CAD) approach to avoid shock-waves efficiently in platoon driving. Numerical results demonstrate that the CAD approach outperforms the compared techniques in the number of shock-waves, average vehicle velocity, average travel time and time to collision (TTC). Additionally, the adaptive platoon length is determined according to the traffic information gathered from the global and local clouds.
    Źródło:
    International Journal of Applied Mathematics and Computer Science; 2019, 29, 2; 213-225
    1641-876X
    2083-8492
    Pojawia się w:
    International Journal of Applied Mathematics and Computer Science
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Diffraction mechanism of five-port transmission gratings
    Autorzy:
    Gao, Chenhao
    Wang, Bo
    Wen, Kunhua
    Meng, Ziming
    Wang, Qu
    Nie, Zhaogang
    Xing, Xiangjun
    Chen, Li
    Lei, Liang
    Zhou, Jinyun
    Powiązania:
    https://bibliotekanauki.pl/articles/1835817.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    1 × 5 splitting
    single-groove grating
    normal incidence
    Opis:
    This paper designs a five-port transmission grating under normal incidence. Rigorous coupled-wave approach is used to optimize the grating parameters. The energy of the grating is mainly dispersed to the 0th, ±1st and ±2nd orders. The efficiency of each diffraction order under both polarizations is close to 20%. The modal method is used to describe the propagation mechanism of the two polarized lights in the grating, and the diffraction behavior of the grating is analyzed. In addition, the grating has a wide range of incident characteristics and a large process tolerance. Therefore, this five-port beam splitter with a connecting layer will be a good polarization-independent beam splitting device.
    Źródło:
    Optica Applicata; 2020, 50, 4; 609-618
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Generation of three-port splitter by double-layer grating in second-order Littrow configuration
    Autorzy:
    Gao, Chenhao
    Wang, Bo
    Fu, Chen
    Fang, Jimin
    Wen, Kunhua
    Meng, Ziming
    Nie, Zhaogang
    Xing, Xiangjun
    Chen, Li
    Lei, Liang
    Zhou, Jinyun
    Powiązania:
    https://bibliotekanauki.pl/articles/174662.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    three-port splitter
    second-order Littrow
    double-layer grating
    Opis:
    In this paper, a novel double-layer three-port grating is described. The incident grating structure is in the second-order Littrow configuration. The grating region is composed of fused silica and Ta2O5.The designed grating beam splitter has high efficiency under TE polarization and TM polarization, respectively. The efficiency of two polarizations is more than 90%. In addition, compared with a single-layer three-port grating, this new beam splitter has good fabrication tolerance and incident bandwidth. Therefore, the optimized structure has a good application value.
    Źródło:
    Optica Applicata; 2020, 50, 2; 271-280
    0078-5466
    1899-7015
    Pojawia się w:
    Optica Applicata
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Preliminary study to explore gene-$\text{PM}_\text{2.5}$ interactive effects on respiratory system in traffic policemen
    Autorzy:
    Zhao, Jinzhuo
    Bo, Liang
    Gong, Changyi
    Cheng, Peng
    Kan, Haidong
    Xie, Yuquan
    Song, Weimin
    Powiązania:
    https://bibliotekanauki.pl/articles/2177102.pdf
    Data publikacji:
    2015-08-07
    Wydawca:
    Instytut Medycyny Pracy im. prof. dra Jerzego Nofera w Łodzi
    Tematy:
    inflammation
    Fine Particles
    traffic workers
    respiratory system
    single nucleotide polymorphism
    SNP
    Opis:
    Objectives Traffic-related particulate matter (PM) is one of the major sources of air pollution in metropolitan areas. This study is to observe the interactive effects of gene and fine particles (particles smaller than 2.5 μm – $\text{PM}_\text{2.5}$) on the respiratory system and explore the mechanisms linking $\text{PM}_\text{2.5}$ and pulmonary injury. Material and Methods The participants include 110 traffic policemen and 101 common populations in Shanghai, China. Continuous 24 h individual-level $\text{PM}_\text{2.5}$ is detected and the pulmonary function, high-sensitivity C-reactive protein (hs-CRP), Clara cell protein 16 (CC16) and the polymorphism in CXCL3, NME7 and C5 genes are determined. The multiple linear regression method is used to analyze the association between $\text{PM}_\text{2.5}$ and health effects. Meanwhile, the interactive effects of gene and $\text{PM}_\text{2.5}$ on lung function are analyzed. Results The individual $\text{PM}_\text{2.5}$ exposure for traffic policemen was higher than that in the common population whereas the forced expiratory volume in 1 s (FEV₁), the ratio of FEV₁ to forced vital capacity (FEV₁/FVC) and lymphocytes are lower. In contrast, the hs-CRP level is higher. In the adjusted analysis, $\text{PM}_\text{2.5}$ exposure was associated with the decrease in lymphocytes and the increase in hs-CRP. The allele frequencies for NME7 and C5 have significant differences between FEV₁/FVC ≤ 70% and FEV₁/FVC > 70% participants. The results didn’t find the interaction effects of gene and $\text{PM}_\text{2.5}$ on FEV₁/FVC in all the 3 genes. Conclusions The results indicated that traffic exposure to high levels of $\text{PM}_\text{2.5}$ was associated with systemic inflammatory response and respiratory injury. Traffic policemen represent a high risk group suffering from the respiratory injury.
    Źródło:
    International Journal of Occupational Medicine and Environmental Health; 2015, 28, 6; 971-983
    1232-1087
    1896-494X
    Pojawia się w:
    International Journal of Occupational Medicine and Environmental Health
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tubular biofilter treatment of isobutanol emissions under various organic loading rates
    Autorzy:
    Chen, Hong
    Peng, Liang
    Wei, Yanxiao
    Yu, Lie
    Jiang, Bo
    Wang, Hong
    Yu, Guanlong
    Zhang, Guijin
    Powiązania:
    https://bibliotekanauki.pl/articles/207774.pdf
    Data publikacji:
    2020
    Wydawca:
    Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
    Tematy:
    biofiltration
    pollutants removal
    volatile compounds
    biofiltracja
    usuwanie zanieczyszczeń
    związki lotne
    Opis:
    Isobutanol in waste gas streams was treated by a tubular biofilter (TBF) which continuously operated for 364 days under various organic loading rate (OLR) from 11 g·m–3·h–1 to 66 g·m–3·h–1. Results show that within 60 days, the TBF successfully started up even after changing the OLR from 31.3 to 15.6 g·m–3·h–1. The average removal efficiencies (REs) were totally higher than 90% when OLRs ranged from 12.14 to 66.45 g·m–3·h–1. Two distinct performance deterioration periods were observed at days 186–253 and days 280–334, both of which recovered without additional measurement. During these periods, the larvae and adult moth flies, been identified as Psychodinae infested the TBF, greatly affected the TBF performance. When the number of adult Psychodinae decreased, TBF performance recovered. The elimination capacity (EC) was 60.42 g·m–3·h–1 at the inlet OLR of 66.45 g·m–3·h–1, with the critical EC being around 50 g·m–3·h–1. Even under a low gas empty bed residence time of 15 s, the preferable REs and ECs under middle or low OLRs were still obtained by the TBF.
    Źródło:
    Environment Protection Engineering; 2020, 46, 1; 15-29
    0324-8828
    Pojawia się w:
    Environment Protection Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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