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1,085 results on '"Yan, Jingjing"'

7. Assessing simulated visible greenness in urban environments

Author

Yan, Jingjing and Huang, Xiao

Abstract

Urban greenness is critical in evaluating the urban environmentand living conditions, significantly affecting human well-being and house prices. Unfortunately, satellite imagery from a bird-eye view does not fully capture urban greenness from a human-centered perspective, while human-perceived greenness from street-view images heavily relies on road networks and vehicle accessibility. In recent years, scholars started to explore greenness measurements from a simulative perspective, among which the simulation of the Viewshed Greenness Visibility Index (VGVI) received wide attention. However, the simulated VGVI lacks a comprehensive assessment. To fill this gap, we designed a field experiment in Fayetteville, Arkansas, by collecting 360-degree panoramas in different local climate zones. Further, we segmented these panoramas via the state-of-the-art DeeplabV2 neural network to obtain the Panoramic Greenness Visibility Index (PGVI), which served as the ground-truthing human-perceived greenness. We assessed the performance of VGVI by comparing it with PGVI calculated from field-collected panoramas. The results showed that, despite the disparity of performance in different local climate zones, VGVI significantly correlates to the PGVI, indicating its great potential for various domains that favor urban human-perceived greenness exposure.

Published
2023

23. Mapping the landscape and roadmap of geospatial artificial intelligence (GeoAI) in quantitative human geography: An extensive systematic review

Author

Wang, Siqin, Huang, Xiao, Liu, Pengyuan, Zhang, Mengxi, Biljecki, Filip, Hu, Tao, Fu, Xiaokang, Liu, Lingbo, Liu, Xintao, Wang, Ruomei, Huang, Yuanyuan, Yan, Jingjing, Jiang, Jinghan, Chukwu, Michaelmary, Reza Naghedi, Seyed, Hemmati, Moein, Shao, Yaxiong, Jia, Nan, Xiao, Zhiyang, Tian, Tian, Hu, Yaxin, Yu, Lixiaona, Yap, Winston, Macatulad, Edgardo, Chen, Zhuo, Cui, Yunhe, Ito, Koichi, Ye, Mengbi, Fan, Zicheng, Lei, Binyu, and Bao, Shuming

Published
2024
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25. Preparation and performance of homogenous braids-reinforced poly (p-phenylene terephthamide) hollow fiber membranes

Author

Wang Chun, Yan Dinghe, Song Shubin, Yan Jingjing, Xue Haolong, and Xiao Changfa

Subjects
poly (p-phenylene terephthamide), braid-reinforced, high strength, pressure resistance, anti-fouling, Polymers and polymer manufacture, TP1080-1185
Abstract

A novel homogenous braid-reinforced (HBR) poly (p-phenylene terephthamide) (PPTA) hollow fiber membrane was prepared in this study. The effects of PPTA concentration on the morphologies and properties of the membranes were further investigated. The results showed that when the PPTA concentration was 2.0 wt%, the cross-sectional morphology of satisfactory interfacial bonding was achieved and the permeation was still maintained at about 200 (L·m−2·h−1) after ultrasonic vibration. In addition, the tensile force exceeded 600 N, which indicated that the homogeneous effect effectively improved the poor mechanical properties and interfacial bonding. In addition, the HBR PPTA hollow fiber membranes were applied to simulate the membrane bioreactor system to explore the control factors of membrane fouling. The results demonstrated that the average removal of total phosphorus and NH4 +–N was above 49% and 96%, respectively; meanwhile, the operating time was up to 120 days. Furthermore, it was easier to nearly remove the pollutants by chemical cleaning.

Published
2023
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35. Self-adaptive fire evacuation by using self-designed 3D indoor positioning system

Author

Yan, Jingjing

Subjects
006.2, TK Electrical engineering. Electronics Nuclear engineering
Abstract

The efficiency of indoor fire evacuation plays an important role for survival improvement and the development of smart fire evacuation system can help solve this problem. An ideal intelligent indoor fire evacuation system must consider users’ physical features and provide a customized evacuation route based on their positions. Meanwhile, it should be able to track the real-time environmental conditions in internal networks in indoor environments. In other words, this type of fire evacuation system should be able to react immediately to the environmental changes in indoor area and provide real-time and valid navigation at any time during movements, avoiding panic/stampede and congestions in exits. This kind of system will be of great importance in future application for human safety. It requires the guidance service to be able to provide current user locations and provide a nearest available exit based on this information, integrated with fire expansion information. It is highly possible under the quick development with the improvement of indoor positioning technologies. The research presented in this thesis has developed a novel 3D positioning system in order to provide solutions for user localization and navigation during fire evacuation and the effect with and without support of navigation will be assessed based on the results of simulation. This study will first provide a review of popular indoor positioning technologies and select possible techniques based on the demands of flexible localizations with satisfied accuracy and low cost with few infrastructures. Pedestrian Dead Reckoning (PDR) and visual tracking are then selected as promising candidates to be combined for 2D positioning and tracking. The applications of the corresponding algorithms for the selected positioning technologies have been chosen based on the comparison of the accuracy and the easiness of operations in the review as well. It will then provide a self-designed system with the integrations of the above selected techniques for horizontal positioning of each floor, within the testing environment located inside a four-floor building of University of Nottingham Ningbo China (UNNC). This 2D passive vision-aided PDR positioning system proposed by this study can achieve an average positioning accuracy of 0.08m on a single floor with less impact of occlusion, which is higher than the systems using similar sensors while using a simpler algorithm, fewer sensors and quicker computation. It has also been tested under the situation with severe occlusions in the selected building. Its accuracy (0.16m) is still comparable to the other studies with less occlusion, which has shown the reliability and stability of the performances for the algorithms while still keeping the advantages of fewer sensor requirement (low-cost) and better sensor accessibility (user-friendly). The system is then further developed into a 3D version with the ability for floor identification by using a smartphone-based barometer. It also achieved a comparable accuracy of height estimation (0.5m) to other studies using the barometers while using fewer sensor and simpler computation. The accuracy of the floor detection is around 98%. The above achieved accuracy in both horizontal and vertical directions are better than the required accuracy targeted by several emergency services, including the Federal Communications Commission (FCC). The above designed tracking system as well as the applied algorithms for sub-systems is the major theoretical contribution of this research. The system can also be applied for speed and inter-personal distance measurement, when tracking the movement of the pedestrians. These measured parameters can be applied into the simulation of the indoor fire evacuation process with the support from the smartphone-based navigation system by using a social-force based agent-based model, with the integration of a simplified fire expansion model. Moreover, the PDR based action recognition can also provide good support for posture recognition and localization reporting of people for later rescue. With the establishment of the simulation model, this study is able to discover the bottlenecks inside the selected building under normal conditions. Moreover, it is able to compare the efficiency of two evacuation strategies, i.e. nearest exits and random walking. These two strategies can represent the indoor evacuation with and without the support of the navigation system. According to the results, the evacuation with the support of navigation system (nearest exits) is more efficient with higher survival rate, shorter average evacuation time, and shorter average evacuation distance. With the above experiments and simulations, this study has achieved an initial success of developing an indoor evacuation navigation system, with promising results.

Published
2020

37. Emissive Azobenzenes Delivered on a Silver Coordination Polymer

Author

Yan, Jingjing, Wilbraham, Liam, Basa, Prem N., Shuettel, Mischa, MacDonald, John C., Ciofini, Ilaria, Coudert, François-Xavier, and Burdette, Shawn C.

Subjects
Condensed Matter - Materials Science
Abstract

Azobenzene has become a ubiquitous component of functional molecules and polymeric materials because of the light-induced trans-cis isomerization of the diazene group. In contrast, there are very few applications utilizing azobenzene luminescence, since the excitation energy typically dissipates via nonradiative pathways. Inspired by our earlier studies with 2,2'-bis[N,N'-(2-pyridyl)methyl]diaminoazobenzene (AzoAMoP) and related compounds, we investigated a series of five aminoazobenzene derivatives and their corresponding silver complexes. Four of the aminoazobenzene ligands, which exhibit no emission under ambient conditions, form silver coordination polymers that are luminescent at room temperature. AzoAEpP (2,2'-bis[N,N'-(4-pyridyl)ethyl]diaminoazobenzene) assembles into a three-dimensional coordination polymer (AgAAEpP) that undergoes a reversible loss of emission upon the addition of metal-coordinating analytes such as pyridine. The switching behavior is consistent with the disassembly and reassembly of the coordination polymer driven by displacement of the aminoazobenzene ligands by coordinating analytes.

Published
2019
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40. Genomic characterisation of de novo EGFR copy number gain and its impact on the efficacy of first-line EGFR-tyrosine kinase inhibitors for EGFR mutated non-small cell lung cancer

Author

Xu, Yiquan, Yan, Jingjing, Zhou, Chengzhi, Wu, Lin, Wang, Haibo, Zhao, Jun, Zhou, Maolin, Wang, Jingyi, Zheng, Xinlong, Zhang, Longfeng, Jiang, Kan, Zheng, Xiaobin, Miao, Qian, Wu, Shiwen, Zou, Zihua, lian, Rong, He, Yuange, Chen, Rongrong, Yang, Shanshan, Li, Yujing, Chen, Sihui, and Lin, Gen

Published
2023
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41. Research on evaporation and humidification characteristics of spray water curtain in heading face

Author

YAN Jingjing, WANG Fei, LI Yucheng, LIU Hongwei, GAO Yabin, and LI Ziwen

Subjects
spray water curtain, evaporation of droplet, humidification characteristics, relative humidity, moisture removal efficiency, Mining engineering. Metallurgy, TN1-997
Abstract

To study the effect of evaporation and humidification characteristics of spray water curtain on the relative humidity of the tunnel, the calculation model for relative humidity was established in the spray space. The effect of different control parameters on the humidity in the tunnel was explored based on numerical simulation. The results show that the mathematical model of spray droplet evaporation and humidification can effectively predict the relative humidity of roadway; the spray flow rate and atomization pressure, the air supply volume of the air duct, the ambient temperature, and humidity all contributed significantly to the relative humidity of the tunnel. By optimizing the parameters, it is possible to not only reduce the effective range of spray humidification on tunnel humidity but to also improve the moisture removal efficiency after spraying.

Published
2023
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45. Resilience Analysis of Military System of Systems Based on Granular Computing

Author

Yan, Jingjing, Bai, Liang, Zhang, Weiming, Fu, Chen, Chinese Institute of Command and Control, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Oneto, Luca, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, and Zhang, Junjie James, Series Editor

Published
2022
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46. Adaptive Optimization Control for VS CMG Control System with Single Degree of Freedom

Author

Shao, Fang, Guan, Rongqiang, Li, Mingyue, Yan, Jingjing, Angrisani, Leopoldo, Series Editor, Arteaga, Marco, Series Editor, Panigrahi, Bijaya Ketan, Series Editor, Chakraborty, Samarjit, Series Editor, Chen, Jiming, Series Editor, Chen, Shanben, Series Editor, Chen, Tan Kay, Series Editor, Dillmann, Rüdiger, Series Editor, Duan, Haibin, Series Editor, Ferrari, Gianluigi, Series Editor, Ferre, Manuel, Series Editor, Hirche, Sandra, Series Editor, Jabbari, Faryar, Series Editor, Jia, Limin, Series Editor, Kacprzyk, Janusz, Series Editor, Khamis, Alaa, Series Editor, Kroeger, Torsten, Series Editor, Li, Yong, Series Editor, Liang, Qilian, Series Editor, Martín, Ferran, Series Editor, Ming, Tan Cher, Series Editor, Minker, Wolfgang, Series Editor, Misra, Pradeep, Series Editor, Möller, Sebastian, Series Editor, Mukhopadhyay, Subhas, Series Editor, Ning, Cun-Zheng, Series Editor, Nishida, Toyoaki, Series Editor, Pascucci, Federica, Series Editor, Qin, Yong, Series Editor, Seng, Gan Woon, Series Editor, Speidel, Joachim, Series Editor, Veiga, Germano, Series Editor, Wu, Haitao, Series Editor, Zamboni, Walter, Series Editor, Zhang, Junjie James, Series Editor, Hung, Jason C., editor, Chang, Jia-Wei, editor, Pei, Yan, editor, and Wu, Wei-Chen, editor

Published
2022
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