Search

Your search keyword '"Luo, Kaiqing"' showing total 159 results
Start Over Author "Luo, Kaiqing"
159 results on '"Luo, Kaiqing"'

1. V2VSSC: A 3D Semantic Scene Completion Benchmark for Perception with Vehicle to Vehicle Communication

Author

Zhang, Yuanfang, Li, Junxuan, Luo, Kaiqing, Yang, Yiying, Han, Jiayi, Liu, Nian, Qin, Denghui, Han, Peng, and Xu, Chengpei

Subjects
Computer Science - Computer Vision and Pattern Recognition
Abstract

Semantic scene completion (SSC) has recently gained popularity because it can provide both semantic and geometric information that can be used directly for autonomous vehicle navigation. However, there are still challenges to overcome. SSC is often hampered by occlusion and short-range perception due to sensor limitations, which can pose safety risks. This paper proposes a fundamental solution to this problem by leveraging vehicle-to-vehicle (V2V) communication. We propose the first generalized collaborative SSC framework that allows autonomous vehicles to share sensing information from different sensor views to jointly perform SSC tasks. To validate the proposed framework, we further build V2VSSC, the first V2V SSC benchmark, on top of the large-scale V2V perception dataset OPV2V. Extensive experiments demonstrate that by leveraging V2V communication, the SSC performance can be increased by 8.3% on geometric metric IoU and 6.0% mIOU.

Published
2024

4. Inhibitory Control Involvement in Overcoming the Position-Velocity Indiscrimination Misconception among College Physics Majors

Author

Lin, Jiabei, Xing, Yuting, Hu, Yudi, Zhang, Jian, Bao, Lei, Luo, Kaiqing, Yu, Keke, and Xiao, Yang

Abstract

Students hold a variety of initial (mis)conceptions that are inconsistent with scientific knowledge and hinder their physics learning. The initial (mis)conceptions could coexist with the scientific ones, even after a conceptual change. Inhibitory control may help overcome initial (mis)conceptions. This study investigated if and how inhibitory control can overcome position-velocity indiscrimination (PVI), a common kinematics misconception. We designed a negative priming paradigm with various prime-probe item pairs. College physics majors had to judge if the items describing the instant that two locomotives have the same velocity were correct. When congruent probes (same position-same velocity) were followed by incongruent primes (same position-different velocity), participants performed worse than when neutral primes (i.e., not passing points) were presented beforehand. The result verified a typical negative priming effect, indicating that inhibitory control is involved in overcoming the PVI misconception. Congruent probes preceded by incongruent primes implicitly triggering the PVI misperception had a lower negative priming effect than explicitly activating it. The results indicated that inhibitory control was needed to overcome the PVI misconception, and the explicit activation of the misconception required more inhibitory control.

Published
2023
Full Text
View/download PDF

5. Robust Edge-Direct Visual Odometry based on CNN edge detection and Shi-Tomasi corner optimization

Author

Lu, Kengdong, Cheng, Jintao, Zhou, Yubin, Deng, Juncan, Fan, Rui, and Luo, Kaiqing

Subjects
Computer Science - Computer Vision and Pattern Recognition, Computer Science - Robotics
Abstract

In this paper, we propose a robust edge-direct visual odometry (VO) based on CNN edge detection and Shi-Tomasi corner optimization. Four layers of pyramids were extracted from the image in the proposed method to reduce the motion error between frames. This solution used CNN edge detection and Shi-Tomasi corner optimization to extract information from the image. Then, the pose estimation is performed using the Levenberg-Marquardt (LM) algorithm and updating the keyframes. Our method was compared with the dense direct method, the improved direct method of Canny edge detection, and ORB-SLAM2 system on the RGB-D TUM benchmark. The experimental results indicate that our method achieves better robustness and accuracy.

Published
2021

35. Microscopic Production Characteristics of Huff-n-Puff after CO2Flooding in Tight Oil Sandstone Reservoirs

Author

Xue, Junjie, Gao, Hui, Wen, Xiaoyong, Wang, Meiqiang, Cheng, Zhilin, Wang, Chen, Li, Teng, Han, Bo, Luo, Kaiqing, and Zhang, Nan

Abstract

This study aims to investigate the impact of CO2huff-n-puff after CO2flooding on recovery efficiency in tight sandstone reservoirs. The experimental methodology involved the selection of three representative cores with different permeability levels to emulate class I, II, and III reservoirs. To examine immiscible, nearly miscible, and miscible conditions for different reservoir samples, a physical simulation flow system integrated with nuclear magnetic resonance technology was employed. CO2flooding was performed followed by CO2huff-n-puff experiments at five pressures, enabling a quantitative analysis of oil production characteristics in various pores during the flooding and huff-n-puff processes. This study provides insights into the microscopic production characteristics and oil recovery influenced by huff-n-puff in tight sandstone reservoirs subsequent to CO2flooding. The experimental results highlight that recovery efficiency increases with higher permeability, with class I reservoir samples exhibiting the highest recovery rate at 76.47%, followed by class II reservoirs at 69.33%, and class III reservoirs at 44.43%. Huff-n-puff recovery for class I and class II reservoirs gradually declines with increasing pressure after flooding, whereas class III reservoirs display an opposite trend, with recovery gradually increasing. In addition, the microscopic oil distribution characteristics change after flooding. During the near-miscible phase, class I and class III reservoirs predominantly yield oil from medium and small pores, while class II reservoirs primarily produce oil from medium pores. Upon reaching miscibility, oil production in class I, II, and III reservoirs primarily occurs in small pores, with some contribution from medium pores. The research findings presented in this paper provide valuable theoretical support for future CO2flooding operations in tight sandstone reservoirs and the optimization of huff-n-puff experiments subsequent to flooding.

Published
2023
Full Text
View/download PDF

37. Effect of Directional Movement on Dynamic Light Scattering

Author

Qiu Jian, Peng Han, Bingquan Xu, Dongmei Liu, Luo Kaiqing, Guiqiong Huang, and Peng Li

Subjects
Physics, Sinc function, Optical autocorrelation, directional movement, QC350-467, Optics. Light, Atomic and Molecular Physics, and Optics, Light scattering, Computational physics, TA1501-1820, scattering wave vector, Dynamic light scattering, intensity autocorrelation function, Dispersion (optics), Range (statistics), Applied optics. Photonics, Electrical and Electronic Engineering, Constant (mathematics), Brownian motion
Abstract

Dynamic light scattering is a standard technique of nano-particle sizing in colloid systems. However, it is difficult to measure the particle size accurately in the flowing dispersion, which is inevitable in many applications, such as on-line measurement. In this paper, we present that the wave vector of the scattered light, which is averaged to a constant in traditional technique, varies with time when the particles undergoing not only the random motion but also the directional movement. This variation results in an additional term of sinc function to the traditional intensity autocorrelation function of the scattered light, thus affect the final particle size determination, especially for large velocity of the directional movement. The experimental results agree well with our derivation. We believe this will facilitate the extension of the technique of the dynamic light scattering to a wider range of application, especially of the on-line measurement in the flowing dispersion.

Published
2021

46. Monitoring of an Ethanol–Water Exchange Process to Produce Bulk Nanobubbles Based on Dynamic Light Scattering

Author

Dongmei Liu, Qiu Jian, Miao Chen, Peng Han, Luo Kaiqing, and Peng Li

Subjects
Materials science, Ethanol, 02 engineering and technology, Surfaces and Interfaces, Water exchange, 010402 general chemistry, 021001 nanoscience & nanotechnology, Condensed Matter Physics, 01 natural sciences, 0104 chemical sciences, chemistry.chemical_compound, Dynamic light scattering, chemistry, Chemical engineering, Scientific method, Electrochemistry, General Materials Science, 0210 nano-technology, Spectroscopy
Abstract

Nanobubbles have been reported to have many novel applications due to their unique physicochemical properties. Ethanol-water exchange is regarded as one of the most convenient methods for producing nanobubbles; however, it is still questioned whether this method can produce bulk nanobubbles or not. In this paper, we present a method to monitor the ethanol-water exchange process based on a setup that combines the equipment of the ethanol-water exchange with an apparatus for dynamic light scattering. In contrast to the previous works where the measurements were performed after the exchanges were completed, our method measures the intensity of the scattered light from the beginning of the process to the end. We found that three different stages of the exchange process can be easily distinguished and that the diameters of the particles produced decrease as the exchange time increases. Furthermore, the measured diameters agree very well with a theoretical model presented very recently for the stability of the bulk nanobubbles in the liquid. Based on these findings, we believe that the products of the ethanol-water exchange are bulk nanobubbles. In addition, since our experimental setup provides the details of the ethanol-water exchange process, it can be used to investigate how to control the parameters of the final nanobubbles, such as their size, concentration, etc., which might promote the potential applications of bulk nanobubbles.

Published
2020

Catalog

Books, media, physical & digital resources
See catalog results