Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00017
Marino Matsuba, M. Hashimoto, Kazuhiko Takahashi
People detection and tracking are crucial issues in various fields, such as surveillance, security, and intelligent transportation systems. This paper presents a people detection and tracking method using light detection and ranging (LiDAR) set in an environment. People detection is achieved using a one-dimensional convolutional neural network (1D-CNN) together with the background subtraction method. Regions of interest are detected based on the background subtraction method, and people are detected in those regions using 1D-CNN. The detected people are tracked using the interacting multimodel estimator; people positions, velocities, and behaviors, such as stopping, walking, and suddenly rushing out, are estimated. Simulation and real-world experiments are conducted using a Velodyne 32-layer LiDAR. The experimental results show that the people tracker conjunction with people detection using both the 1D-CNN and background subtraction method enables accurate multipeople tracking.
{"title":"People Detection and Tracking Using Ground LiDAR","authors":"Marino Matsuba, M. Hashimoto, Kazuhiko Takahashi","doi":"10.1109/ASSP57481.2022.00017","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00017","url":null,"abstract":"People detection and tracking are crucial issues in various fields, such as surveillance, security, and intelligent transportation systems. This paper presents a people detection and tracking method using light detection and ranging (LiDAR) set in an environment. People detection is achieved using a one-dimensional convolutional neural network (1D-CNN) together with the background subtraction method. Regions of interest are detected based on the background subtraction method, and people are detected in those regions using 1D-CNN. The detected people are tracked using the interacting multimodel estimator; people positions, velocities, and behaviors, such as stopping, walking, and suddenly rushing out, are estimated. Simulation and real-world experiments are conducted using a Velodyne 32-layer LiDAR. The experimental results show that the people tracker conjunction with people detection using both the 1D-CNN and background subtraction method enables accurate multipeople tracking.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130657235","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00015
Xiangpan Zheng, Hui Huang, S. Chen, Wenxiang Wang
Brake is an important safety device for traction elevators, and its safety and reliability ensure the safe operation of elevators. The work, analyzing the standardized original parameters of elevators, designed a new brake device based on magnetorheological effect. The mathematical physics method was used to establish the multiphysics mathematical model of magnetic field, flow field and rotor dynamic equation of device in finite element software. The model considered the influences of the uneven distribution of magnetic field as well as the changes of rotational speed, volumetric force and temperature change on magnetorheological fluid. Thus, the simulation was close to the actual device. The model was used for the dynamic simulation, which revealed the variation of braking torque, braking time and temperature of magnetorheological braking device under different currents and speeds. The simulation results are consistent with the experimental results, and the magnetorheological brake has the advantages of small impact, low noise, fast response and easy control when used in elevator. Research achievements of the work provide new thought for new brake device of traction elevator in engineering field.
{"title":"Multi-physical Field Numerical Analysis and Experiment on Magnetorheological Brake of Traction Elevator","authors":"Xiangpan Zheng, Hui Huang, S. Chen, Wenxiang Wang","doi":"10.1109/ASSP57481.2022.00015","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00015","url":null,"abstract":"Brake is an important safety device for traction elevators, and its safety and reliability ensure the safe operation of elevators. The work, analyzing the standardized original parameters of elevators, designed a new brake device based on magnetorheological effect. The mathematical physics method was used to establish the multiphysics mathematical model of magnetic field, flow field and rotor dynamic equation of device in finite element software. The model considered the influences of the uneven distribution of magnetic field as well as the changes of rotational speed, volumetric force and temperature change on magnetorheological fluid. Thus, the simulation was close to the actual device. The model was used for the dynamic simulation, which revealed the variation of braking torque, braking time and temperature of magnetorheological braking device under different currents and speeds. The simulation results are consistent with the experimental results, and the magnetorheological brake has the advantages of small impact, low noise, fast response and easy control when used in elevator. Research achievements of the work provide new thought for new brake device of traction elevator in engineering field.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"55 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127062972","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00010
Xueyang Zhao, Xuhu Ren, Zhidan Yan, Hanlin Wang
The surface mud pressure pulse signal based on the Measurement While Drilling (MWD) system is interfered with by pump noise and random noise. Even the pump noise not only completely covers the useful pulse signal in the time domain but also exists band aliasing with the useful pulse signal in the frequency domain. To solve this problem, this paper presents a combined denoising method for the mud pulse signal of the single sensor MWD. Based on the characteristics of solid pump noise, a state space model of pump noise (linear time-invariant model) is established. The Kalman filter based on the adaptive coefficient is used to reconstruct and filter the pump noise. And the residual random noise after pump noise is filtered by the stochastic resonance principle. At the same time, the positive pulse signals of several different SNR muds containing noise under an unsteady pump noise state are simulated, and the noise suppression ability of the scheme is analyzed and evaluated. The results show that the proposed scheme can suppress or even remove the unsteady pump noise in the original signal, and the signal-to-noise ratio can be increased by about 5-24 dB.
{"title":"Research on Denoising Method of Mud Pulse Signal Based On Adaptive Coefficient Kalman","authors":"Xueyang Zhao, Xuhu Ren, Zhidan Yan, Hanlin Wang","doi":"10.1109/ASSP57481.2022.00010","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00010","url":null,"abstract":"The surface mud pressure pulse signal based on the Measurement While Drilling (MWD) system is interfered with by pump noise and random noise. Even the pump noise not only completely covers the useful pulse signal in the time domain but also exists band aliasing with the useful pulse signal in the frequency domain. To solve this problem, this paper presents a combined denoising method for the mud pulse signal of the single sensor MWD. Based on the characteristics of solid pump noise, a state space model of pump noise (linear time-invariant model) is established. The Kalman filter based on the adaptive coefficient is used to reconstruct and filter the pump noise. And the residual random noise after pump noise is filtered by the stochastic resonance principle. At the same time, the positive pulse signals of several different SNR muds containing noise under an unsteady pump noise state are simulated, and the noise suppression ability of the scheme is analyzed and evaluated. The results show that the proposed scheme can suppress or even remove the unsteady pump noise in the original signal, and the signal-to-noise ratio can be increased by about 5-24 dB.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129564436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00022
Kanlun Wang, Zhe Fu, Lina Zhou, Yunqin Zhu
Social media emerge as common platforms for knowledge sharing/exchange in online communities. Meanwhile, they also become a hotbed for the diffusion of misinformation. Content moderation is one of the measures for preventing the distribution of misinformation. Despite the increasing research attention to content moderation, the role of user engagement in content moderation remains significantly understudied. It is unclear how different characteristics and degrees of user engagement in social media might impact the performance of content moderation. In addition, the efficiency of content moderation has not been addressed by prior studies. This study aims to fill these research gaps by investigating the characteristics of user engagement behavior in social media and developing automated models to support content moderation that leverage a state-of-the-art pre-trained model for text analysis. The evaluation results with Reddit data suggest that the directivity and temporal characteristics of user engagement have significant effects on the effectiveness of content moderation. Additionally, leveraging the entire history of user engagement tends to be inefficient or even impractical, yet our findings provide evidence and a guide for improving the efficiency of content moderation using user engagement data without compromising model effectiveness. Our findings have research and practical implications for the moderation and deterrence of misinformation in social media.
{"title":"Content Moderation in Social Media: The Characteristics, Degree, and Efficiency of User Engagement","authors":"Kanlun Wang, Zhe Fu, Lina Zhou, Yunqin Zhu","doi":"10.1109/ASSP57481.2022.00022","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00022","url":null,"abstract":"Social media emerge as common platforms for knowledge sharing/exchange in online communities. Meanwhile, they also become a hotbed for the diffusion of misinformation. Content moderation is one of the measures for preventing the distribution of misinformation. Despite the increasing research attention to content moderation, the role of user engagement in content moderation remains significantly understudied. It is unclear how different characteristics and degrees of user engagement in social media might impact the performance of content moderation. In addition, the efficiency of content moderation has not been addressed by prior studies. This study aims to fill these research gaps by investigating the characteristics of user engagement behavior in social media and developing automated models to support content moderation that leverage a state-of-the-art pre-trained model for text analysis. The evaluation results with Reddit data suggest that the directivity and temporal characteristics of user engagement have significant effects on the effectiveness of content moderation. Additionally, leveraging the entire history of user engagement tends to be inefficient or even impractical, yet our findings provide evidence and a guide for improving the efficiency of content moderation using user engagement data without compromising model effectiveness. Our findings have research and practical implications for the moderation and deterrence of misinformation in social media.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"329 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122739158","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00013
Zhen-xin Yu
With the development of science and technology, the digital drive signal generated by the CNC oscillator is turned into an analogue signal to drive the magnetic sensor through a digital to analogue converter, and the output signal from the CNC oscillator to a digital phase amplifier. This process allows the digital demodulation technique to be deeply optimised. Caesium light pump magnetometer is a high precision, high sensitivity weak magnetic field measurement instrument based on the Saiman effect of Caesium atoms in a magnetic field, then combined with light pumping action and magnetic resonance technology. Currently, the digitalisation of the signal detection system of the domestic cesium light pump magnetometer is low and there is a considerable gap with foreign products. This paper discusses the application of the model in the digital demodulation of the all-optical cesium light pump magnetometer based on the all-optical cesium light cluster demodulation technology. The output of the CNC oscillator, the amplitude-frequency response of the low-pass filter circuit and the frequency accuracy of the driving signal in the digital signal generator are tested experimentally, and the waveforms of the collected signals in the digital lock-in amplifier and the accuracy of the phase measurement and amplitude measurement are tested for the readers' reference.
{"title":"Study on Digital Demodulation Technology of All-Optical Cesium Optically Pumped Magnetometer","authors":"Zhen-xin Yu","doi":"10.1109/ASSP57481.2022.00013","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00013","url":null,"abstract":"With the development of science and technology, the digital drive signal generated by the CNC oscillator is turned into an analogue signal to drive the magnetic sensor through a digital to analogue converter, and the output signal from the CNC oscillator to a digital phase amplifier. This process allows the digital demodulation technique to be deeply optimised. Caesium light pump magnetometer is a high precision, high sensitivity weak magnetic field measurement instrument based on the Saiman effect of Caesium atoms in a magnetic field, then combined with light pumping action and magnetic resonance technology. Currently, the digitalisation of the signal detection system of the domestic cesium light pump magnetometer is low and there is a considerable gap with foreign products. This paper discusses the application of the model in the digital demodulation of the all-optical cesium light pump magnetometer based on the all-optical cesium light cluster demodulation technology. The output of the CNC oscillator, the amplitude-frequency response of the low-pass filter circuit and the frequency accuracy of the driving signal in the digital signal generator are tested experimentally, and the waveforms of the collected signals in the digital lock-in amplifier and the accuracy of the phase measurement and amplitude measurement are tested for the readers' reference.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"96 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122790090","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2022-12-01DOI: 10.1109/ASSP57481.2022.00016
Wentian Fan, Yingmei Chen, Haojie Cui, Chao Guo, En Zhu, Zhengfei Hu
This paper presents a 4-level pulse amplitude modulation (PAM-4) linear driver for Mach-Zehnder Modulators (MZM) in 90-nm SiGe BiCMOS technology. The transmission line was employed in the input and output wiring to reduce the transmission loss of the high-speed signal. In addition, by adopting coupled inductor peaking technology and continuous time linear equalizer (CLTE), the bandwidth of system reaches 42.1 GHz. The drive output stage of the system uses single emitter follower push pull (SEFPP) structure to achieve large output swing. Post-simulation results show that the MZM-driver can deliver a differential output signal of 3.6 Vpp when inputting 56Gbaud PAM-4 signal of 300-900 mVppd, and the total harmonic distortion (THD) is 2.7%. The driver works under a 5 V supply with a power consumption equal to 905 mW. The physical layout occupies an area of 0.96×1.1 mm2.
{"title":"A 56Gbaud PAM-4 Linear Driver for Mach-Zehnder Modulators in 90-nm SiGe BICMOS Technology","authors":"Wentian Fan, Yingmei Chen, Haojie Cui, Chao Guo, En Zhu, Zhengfei Hu","doi":"10.1109/ASSP57481.2022.00016","DOIUrl":"https://doi.org/10.1109/ASSP57481.2022.00016","url":null,"abstract":"This paper presents a 4-level pulse amplitude modulation (PAM-4) linear driver for Mach-Zehnder Modulators (MZM) in 90-nm SiGe BiCMOS technology. The transmission line was employed in the input and output wiring to reduce the transmission loss of the high-speed signal. In addition, by adopting coupled inductor peaking technology and continuous time linear equalizer (CLTE), the bandwidth of system reaches 42.1 GHz. The drive output stage of the system uses single emitter follower push pull (SEFPP) structure to achieve large output swing. Post-simulation results show that the MZM-driver can deliver a differential output signal of 3.6 Vpp when inputting 56Gbaud PAM-4 signal of 300-900 mVppd, and the total harmonic distortion (THD) is 2.7%. The driver works under a 5 V supply with a power consumption equal to 905 mW. The physical layout occupies an area of 0.96×1.1 mm2.","PeriodicalId":177232,"journal":{"name":"2022 3rd Asia Symposium on Signal Processing (ASSP)","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127653627","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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