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Subway rail transit monitoring by built-in sensor platform of smartphone Research Articles
Jian-li Cong, Ming-yuan Gao, Yuan Wang, Rong Chen, Ping Wang,jlcong2019@my.swjtu.edu.cn,gaomingyuan@swu.edu.cn,wangy39@sustech.edu.cn,chenrong@home.swjtu.edu.cn,wping@home.swjtu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 8, Pages 1119-1266 doi: 10.1631/FITEE.1900242
Keywords： 加速度数据；智能监测；内置传感器；智能手机；地铁
An Area Changeable Capacitive Micro-machined Accelerometer
Li Baoqing,Lu Deren,Wang Weiyuan
Strategic Study of CAE 2000, Volume 2, Issue 2, Pages 36-40
In this paper, a newly developed accelerometer based on the principle of area changeable capacitance is presented at the first time. The movable mass is designed as many bars connected together and suspended by elastic beams. Two comb-shaped fixed electrodes with their fingers side by side are alternately placed under the mass. The mass moves in the direction parallel with the substrate plane under the effect of acceleration. The movable mass and fixed electrodes compose a differential capacitor unit. It is concluded by theoretical analysis that the signal of the acceleration is only proportionally related to the area between movable mass and fixed electrodes but not related to the gap between them. The parasitic capacitance Cp between the mass and fixed electrodes and CB induced by boundary effect both lower the sensitivity of the accelerometer by about 20 % , and lead to a vertical effect on accelerometer that could be ignored if compared with the sensitivity. The quasi-LIGA technology with Ni as structure layer and Cu as sacrificial layer is used to fabricate the sensor chips. The fixed electrodes are fabricated on a glass substrate. A Cu sacrificial layer used to determine the gap between the mass and fixed electrodes is then electroplated with the fixed electrodes layer. Finally, the movable Ni mass is also electroplated with the Cu layer and is released after selective etch of the Cu layer. After packaging in IC ceramic die under atmosphere, the accelerometer is put on avibrator to be tested under a frequency of 25 Hz. The output signal is connected to the interface circuit with electric wires. The experimental results show that the accelerometer has typical sensitivity of 58.1 mV/ (m·s-2) and non-linearity of 4% FS in operating range of 20 m/s2. The obtained non-linearity is not ideal and the reason is discussed based on experimental conditions
Keywords： capacitance accelerometer area changeable
The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor
Zhang Fuxue
Strategic Study of CAE 2002, Volume 4, Issue 8, Pages 50-53
It is discovered that the natural convection gas has the pendulum characteristic, so the new concept of gas pendulum is presented. In this paper, the buoyancy lift of natural convection gas is analyzed in a hermetic chamber, and given the formula between the buoyancy lift and the change of temperature. The results of experiment have shown that gas pendulum can be utilized to measure the acceleration and tilt angle as same as solid pendulum and liquid pendulum.
Keywords： gas pendulum characteristic tilt sensor accelerometer
Gregory L. Damhorst,Carlos Duarte-Guevara,Weili Chen,Tanmay Ghonge,Brian T. Cunningham,Rashid Bashir
Engineering 2015, Volume 1, Issue 3, Pages 324-335 doi: 10.15302/J-ENG-2015072
Viral load measurements are an essential tool for the long-term clinical care of human immunodeficiency virus (HIV)-positive individuals. The gold standards in viral load instrumentation, however, are still too limited by their size, cost, and sophisticated operation for these measurements to be ubiquitous in remote settings with poor healthcare infrastructure, including parts of the world that are disproportionately affected by HIV infection. The challenge of developing a point-of-care platform capable of making viral load more accessible has been frequently approached but no solution has yet emerged that meets the practical requirements of low cost, portability, and ease-of-use. In this paper, we perform reverse-transcription loop-mediated isothermal amplification (RT-LAMP) on minimally processed HIV-spiked whole blood samples with a microfluidic and silicon microchip platform, and perform fluorescence measurements with a consumer smartphone. Our integrated assay shows amplification from as few as three viruses in a ~ 60 nL RT-LAMP droplet, corresponding to a whole blood concentration of 670 viruses per μL of whole blood. The technology contains greater power in a digital RT-LAMP approach that could be scaled up for the determination of viral load from a finger prick of blood in the clinical care of HIV-positive individuals. We demonstrate that all aspects of this viral load approach, from a drop of blood to imaging the RT-LAMP reaction, are compatible with lab-on-a-chip components and mobile instrumentation.
Keywords： human immunodeficiency virus (HIV) viral load loop-mediated isothermal amplification smartphone point-of-care
Yan-Ning Sun,Wei Qin,Jin-Hua Hu,Hong-Wei Xu,Poly Z.H. Sun
Engineering 2023, Volume 22, Issue 3, Pages 82-93 doi: 10.1016/j.eng.2022.06.019
The soft sensing of key performance indicators (KPIs) plays an essential role in the decision-making of complex industrial processes. Many researchers have developed data-driven soft sensors using cutting-edge machine learning (ML) or deep learning (DL) models. Moreover, feature selection is a crucial issue because a raw industrial dataset is usually high-dimensional, and not all features are conducive to the development of soft sensors. A perfect feature-selection method should not rely on hyperparameters and subsequent ML or DL models. Rather, it should be able to automatically select a subset of features for soft sensor modeling, in which each feature has a unique causal effect on industrial KPIs. Therefore, this study proposes a causal model-inspired automatic feature-selection method for the soft sensing of industrial KPIs. First, inspired by the post-nonlinear causal model, we integrate it with information theory to quantify the causal effect between each feature and the KPIs in the raw industrial dataset. After that, a novel feature-selection method is proposed to automatically select the feature with a non-zero causal effect to construct the subset of features. Finally, the constructed subset is used to develop soft sensors for the KPIs by means of an AdaBoost ensemble strategy. Experiments on two practical industrial applications confirm the effectiveness of the proposed method. In the future, this method can also be applied to other industrial processes to help develop more advanced data-driven soft sensors.
Keywords： Big data analytics Machine intelligence Quality prediction Soft sensors Intelligent manufacturing
Dai Juchuan,Wu Xinkai,Wen Li
Strategic Study of CAE 2009, Volume 11, Issue 4, Pages 91-95
In direct torque control system, the PID controller is often adopted to be the speed adjuster. When disturbances are thrown to the motor, a long time is taken to renew the motor to steady state. In this paper, new auto-disturbance-rejection controller (ADRC) is introduced into direct torque control system. Instead of PID speed adjuster, ADRC speed adjuster is designed. The speed observer is designed based on model reference adaptive system (MRAS), too. The performance difference is analyzed between PID controller and ADRC in speed sensorless direct torque control system. The simulation results show that the AC speed adjustable system has speedier response performance, stronger disturbance-rejection performance when ADRC is adopted. Moreover, according to simulation results, there is smaller warp between motor command speed and actual speed when motor parameters perturb.
Keywords： direct torque control active disturbances rejection control speed observer speed sensorless induction motor
Zero ground clearance dual antenna pair for metal-cased fifth-generation multiple input multiple output smartphone Correspondence
Le CHANG, Wenbao HE, Xiaomin CHEN, Xiaoxue TAN, Juan CHEN, Kai KANG, Yang YANG
Frontiers of Information Technology & Electronic Engineering 2022, Volume 23, Issue 10, Pages 1562-1567 doi: 10.1631/FITEE.2200119
The fifth-generation (5G) era has already arrived and many applications are prospering. The multiple input multiple output (MIMO) system is the key to enhancing channel capacity for both the fourthgeneration (4G) wireless communication and 5G systems. For a smartphone, the most challenging task for antenna engineers is to accommodate the numerous 4G and 5G multi-port antennas while avoiding mutual coupling problems (Li Y et al., 2009, 2012; Hong, 2017; Sharawi et al., 2017). Therefore, implementing multiple antennas within a small space is a worthwhile topic to study, especially for antennas operating at the same frequency.
Keywords： 天线对；第五代移动通信技术（5G）；Sub-6 GHz；极化正交；智能终端；智能手机；零净空；全金属外壳；多输入多输出（MIMO）
Big Data for Precision Medicine
Daniel Richard Leff, Guang-Zhong Yang
Engineering 2015, Volume 1, Issue 3, Pages 277-279 doi: 10.15302/J-ENG-2015075
This article focuses on the potential impact of big data analysis to improve health, prevent and detect disease at an earlier stage, and personalize interventions. The role that big data analytics may have in interrogating the patient electronic health record toward improved clinical decision support is discussed. We examine developments in pharmacogenetics that have increased our appreciation of the reasons why patients respond differently to chemotherapy. We also assess the expansion of online health communications and the way in which this data may be capitalized on in order to detect public health threats and control or contain epidemics. Finally, we describe how a new generation of wearable and implantable body sensors may improve wellbeing, streamline management of chronic diseases, and improve the quality of surgical implants.
Keywords： big data biosensors body-sensing networks implantable sensors clinical decision support systems pharmacogenetics mHealth
A high-isolation coupled-fed building block for metal-rimmed 5G smartphones Correspondence
Aidi REN, Chengwei YU, Lixia YANG, Wei CUI, Zhixiang HUANG, Ying LIU
Frontiers of Information Technology & Electronic Engineering 2023, Volume 24, Issue 11, Pages 1657-1664 doi: 10.1631/FITEE.2300203
An intelligent IEQ monitoring and feedback system: Development and applications Article
Yang Geng,Zhongchen Zhang,Juan Yu,Hongzhong Chen,Hao Zhou,Borong Lin,Weimin Zhuang
Engineering 2022, Volume 18, Issue 11, Pages 218-231 doi: 10.1016/j.eng.2021.09.017
Indoor environmental quality (IEQ) significantly affects human health and wellbeing. Therefore, continuous IEQ monitoring and feedback is of great concern in both the industrial and academic communities. However, most existing studies only focus on developing sensors that cost-effectively promote IEQ measurement while ignoring interactions between the human side and IEQ monitoring. In this study, an intelligent IEQ monitoring and feedback system (IBEM) is developed. Firstly, the IBEM hardware instrument integrates air temperature, relative humidity, CO2, particulate matter with an aerodynamic diameter no greater than 2.5 μm (PM2.5), and illuminance sensors within a small device. The accuracy of this integrated device was tested through a co-location experiment with reference sensors; the device exhibited a strong correlation with the reference sensors, with a slight deviation (R2 > 0.97 and slopes between 1.01 and 1.05). Secondly, a wireless data transmission module, a cloud storage module, and graphical user interfaces (i.e., a web platform and mobile interface) were built to establish a pathway for dataflow and interactive feedback with the occupants of the indoor environments. Thus, the IEQ parameters can be continuously monitored with a high spatiotemporal resolution, interactive feedback can be induced, and synchronous data collection on occupant satisfaction and objective environmental parameters can be realized. IBEM has been widely applied in 131 buildings in 18 cities in China, with 1188 sample locations. Among these applications, we report on the targeted IEQ diagnoses of two individual buildings and the exploration of relationships between subjective and objective IEQ data in detail here. This work demonstrates the great value of IBEM in both industrial and academic research.
Keywords： Indoor environmental quality (IEQ) Sensors Continuous monitoring Graphical user interface Interactive feedback
Inverse Analysis and Design of the Rational Acceleration of Mine Winder Rope System
Peng Youduo,Liu Deshun,Zhu Pingyu,Zhang Yongzhong,Guo Yingfu
Strategic Study of CAE 2002, Volume 4, Issue 4, Pages 64-68
The prompting acceleration of hoisting rope system determines the winderssitting comfort and the dynamic load in hoisting rope. The over dynamic load is the main factor which leads slipping or breaking out of hoisting rope. Based on the condition that the hoisting rope. Be regarded as the continuous flexible rod, and the equation of hoisting rope system, by the characteristic lines numerical value analyzing method and taking the ride comfort of hoisting cage and the little dynamic oscillation of hoisting rope as the aim, the rational acceleration curve of rope system is brought out in this paper, and it can provide reference for further study and design of mine winders.
Keywords： hoisting rope system prompting acceleration ride comfort ableness dynamic tensile force inverse design
Application of Hydraulic Pressure Sensore System on Riverb ed ErosionDepth for Real-time Monitoring
Chen Zhijian,Liu Dawei,Zhang Weiwen
Strategic Study of CAE 2007, Volume 9, Issue 5, Pages 17-21
The problem of groundsill eroding is general and important for deep-water foundation in tidal reach. Application, technical difficulty and its settlement scheme of hydraulic pressure sensors system are introduced based on expounding the essentiality of riverbed erosion for real-time monitoring within group piled foundation. Amendment of fluctuant water level is realized by setting a sensor to monitor the tide. The sensors are fixed on the side of the piles reliably and sensor signal is transmitted smoothly with single point setting method. This method shows the characteristics of real-time, continuity, long-term and high precision when applied to the Su-Tong Bridge Project. Based on the results of monitoring, the mechanism of local scour within group piled foundation is analyzed.
Keywords： hydraulic pressure sensor tidal reach group piled foundation local scour real-time monitoring
Design of structure health monitoring system of Taizhou Bridge
Tang Ke and Dai Pengfei
Strategic Study of CAE 2012, Volume 14, Issue 5, Pages 14-18
A systematic description of the design of health monitoring system for the structure of extra-large suspension bridge is presented based on Taizhou Bridge. The system consists of 3 sub-systems of sensors, data acquisition and transmission, and data processing and analysis. It merges the traditional wire acquisition method and the new wireless acquisition method, which is the first large-scale application in China as well as in the world.
Keywords： health monitoring system wireless sensor largescale bridge structure
Jin-wen Hu, Bo-yin Zheng, Ce Wang, Chun-hui Zhao, Xiao-lei Hou, Quan Pan, Zhao Xu,hujinwen@nwpu.edu.cn,zhengboyin@mail.nwpu.edu.cn
Frontiers of Information Technology & Electronic Engineering 2020, Volume 21, Issue 5, Pages 649-808 doi: 10.1631/FITEE.1900518
Keywords： Multi-sensor fusion Obstacle detection Off-road environment Intelligent vehicle Unmanned ground vehicle
利用对称结构和结合差分进化的文化算法检测阵列中的故障传感器 Article
Shafqat Ullah KHAN,Ijaz Mansoor QURESHI,Fawad ZAMAN,Wasim KHAN
Frontiers of Information Technology & Electronic Engineering 2017, Volume 18, Issue 2, Pages 235-245 doi: 10.1631/FITEE.1500315
Keywords： 文化算法；差分进化；线性对称传感器阵列
Title Author Date Type Operation
Subway rail transit monitoring by built-in sensor platform of smartphone
Jian-li Cong, Ming-yuan Gao, Yuan Wang, Rong Chen, Ping Wang,jlcong2019@my.swjtu.edu.cn,gaomingyuan@swu.edu.cn,wangy39@sustech.edu.cn,chenrong@home.swjtu.edu.cn,wping@home.swjtu.edu.cn
Journal Article
An Area Changeable Capacitive Micro-machined Accelerometer
Li Baoqing,Lu Deren,Wang Weiyuan
Journal Article
The Pendulum Characteristic of Natural Convection Gas and the Application for Sensor
Zhang Fuxue
Journal Article
Smartphone-Imaged HIV-1 Reverse-Transcription Loop-Mediated Isothermal Amplification (RT-LAMP) on a Chip from Whole Blood
Gregory L. Damhorst,Carlos Duarte-Guevara,Weili Chen,Tanmay Ghonge,Brian T. Cunningham,Rashid Bashir
Journal Article
A Causal Model-Inspired Automatic Feature-Selection Method for Developing Data-Driven Soft Sensors in Complex Industrial Processes
Yan-Ning Sun,Wei Qin,Jin-Hua Hu,Hong-Wei Xu,Poly Z.H. Sun
Journal Article
Study on auto-disturbances-rejection AC adjustable speed based on speed sensorless direct torque control
Dai Juchuan,Wu Xinkai,Wen Li
Journal Article
Zero ground clearance dual antenna pair for metal-cased fifth-generation multiple input multiple output smartphone
Le CHANG, Wenbao HE, Xiaomin CHEN, Xiaoxue TAN, Juan CHEN, Kai KANG, Yang YANG
Journal Article
A high-isolation coupled-fed building block for metal-rimmed 5G smartphones
Aidi REN, Chengwei YU, Lixia YANG, Wei CUI, Zhixiang HUANG, Ying LIU
Journal Article
An intelligent IEQ monitoring and feedback system: Development and applications
Yang Geng,Zhongchen Zhang,Juan Yu,Hongzhong Chen,Hao Zhou,Borong Lin,Weimin Zhuang
Journal Article
Inverse Analysis and Design of the Rational Acceleration of Mine Winder Rope System
Peng Youduo,Liu Deshun,Zhu Pingyu,Zhang Yongzhong,Guo Yingfu
Journal Article
Application of Hydraulic Pressure Sensore System on Riverb ed ErosionDepth for Real-time Monitoring
Chen Zhijian,Liu Dawei,Zhang Weiwen
Journal Article
Design of structure health monitoring system of Taizhou Bridge
Tang Ke and Dai Pengfei
Journal Article
A survey on multi-sensor fusion based obstacle detection for intelligent ground vehicles in off-road environments
Jin-wen Hu, Bo-yin Zheng, Ce Wang, Chun-hui Zhao, Xiao-lei Hou, Quan Pan, Zhao Xu,hujinwen@nwpu.edu.cn,zhengboyin@mail.nwpu.edu.cn
Journal Article
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