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mobile technology:Usage and perspective of patients and caregivers presenting to a tertiary care emergency department

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World Journal of Emergency Medicine 2020年第1期11卷 5-11页

作者： Zhenghong Liu Mingwei Ng Dinesh V.Gunasekeran Huihua Li Kishanti Ponampalam R Ponampalam SingHealth Emergency Medicine Residency Programme Singapore Health ServicesSingapore Ministry of Health Holdings Singapore Health Services Research Unit Singapore General HospitalSingapore University of Newcastle Australia Department of Emergency Medicine Singapore General HospitalSingapore

BACKGROUND:Developments in information technology(IT)have driven a push in healthcare innovation in the emergency department(ED).Many of these applications rely on mobile technology(MT)such as smartphones but not everyone is comfortable with MT usage.Our study aims to characterize the technology usage behavior of users in the ED so as to guide the implementation of IT interventions in the ED.METHODS:A cross-sectional survey was conducted in the emergency department of a tertiary hospital.Patients and their caregivers aged 21 and above were recruited.The survey collected demographic information,technology usage patterns,and participant reported comfort level in the usage of MT.We performed descriptive statistics and multivariate logistic regression to identify factors differentially associated with comfort in usage of MT.RESULTS:A total of 498 participants were recruited,and 299(60%)were patients.English was the most commonly written and read language(66.9%)and 64.2%reported a comfort level of 3/5 or more in using MT.Factors that were associated with being comfortable in using MT include having a tertiary education,being able to read and write English,as well as being a frequent user of IT.Caregivers were more likely to display these characteristics.CONCLUSION:A large proportion of ED patients are not comfortable in the usage of MT.Factors that predicted comfort level in the usage of MT were common amongst caregivers.Future interventions should take this into consideration in the design of MT interventions.

关键词： mobile health technology Information technology Emergency department

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mobile Web Augmented Reality in 5G and Beyond:Challenges, Opportunities, and Future Directions

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China Communications 2019年第9期16卷 141-154页

作者： Xiuquan Qiao Pei Ren Guoshun Nan Ling Liu Schahram Dustdar Junliang Chen State Key Laboratory of Networking and Switching Technology Beijing University of Posts and TelecommunicationsBeijing 100876China College of Computing Georgia Institute of TechnologyAtlantaGA 30332USA Distributed Systems Group TU Wien1040 ViennaAustria

The popularity of wearable devices and smartphones has fueled the development of mobile Augmented Reality(MAR),which provides immersive experiences over the real world using techniques,such as computer vision and deep learning.However,the hardware-specific MAR is costly and heavy,and the App-based MAR requires an additional download and installation and it also lacks cross-platform ability.These limitations hamper the pervasive promotion of MAR.This paper argues that mobile Web AR(MWAR)holds the potential to become a practical and pervasive solution that can effectively scale to millions of end-users because MWAR can be developed as a lightweight,cross-platform,and low-cost solution for end-to-end delivery of MAR.The main challenges for making MWAR a reality lie in the low efficiency for dense computing in Web browsers,a large delay for real-time interactions over mobile networks,and the lack of standardization.The good news is that the newly emerging 5G and Beyond 5G(B5G)cellular networks can mitigate these issues to some extent via techniques such as network slicing,device-to-device communication,and mobile edge computing.In this paper,we first give an overview of the challenges and opportunities of MWAR in the 5G era.Then we describe our design and development of a generic service-oriented framework(called MWAR5)to provide a scalable,flexible,and easy to deploy MWAR solution.We evaluate the performance of our MWAR5 system in an actually deployed 5G trial network under the collaborative configurations,which shows encouraging results.Moreover,we also share the experiences and insights from our development and deployment,including some exciting future directions of MWAR over 5G and B5G networks.

关键词： 5G edge computing augmentedreality mobile augmented reality Web augmentedreality

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A Real Time Self-Tuning Motion Controller for mobile Robot Systems

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IEEE/CAA Journal of Automatica Sinica 2019年第1期6卷 84-96页

作者： Mohamed Boukens Abdelkrim Boukabou Mohammed Chadli the Department of Electronics University of Laghouat IEEE the Department of Electronics University of MSB Jijel University of Picardie Jules Verne

This paper proposes an intelligent controller for motion control of robotic systems to obtain high precision tracking without the need for a real-time trial and error method.In addition, a new self-tuning algorithm has been developed based on both the ant colony algorithm and a fuzzy system for real-time tuning of controller parameters. Simulations and experiments using a real robot have been addressed to demonstrate the success of the proposed controller and validate the theoretical analysis. Obtained results confirm that the proposed controller ensures robust performance in the presence of disturbances and parametric uncertainties without the need for adjustment of control law parameters by a trial and error method.

关键词： Learning and adaptive systems motion control metaheuristic robust control real-time tuning self-tuning wheeled mobile robot

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mobile Payment and Informal Business:Evidence from China’s Household Panel Data

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China & World Economy 2020年第3期28卷 90-115页

作者： Xue Wang National School of Development and Institute of Digital Finance Peking University

This paper uses household panel data to explore the impact of mobile payments on China's household business activity.Using a difference-in-difference fixed effect specification,Ifind that mobile payment users are more likely to operate small-scale and self-employed informal businesses.The impact of"using mobile payment primarily derives from the transition of agricultural families to business owners and the development of informal businesses.The paper illustrates an associated increase in employment and income,for family members,with more pronounced effects on low-income and rural households.It also provides prima facie evidence of the increase in fund transfers,which is important for risk sharing that informnal businesses may encounter.

关键词： entrepreneurial activity financial inclusion mobile payment small and micro-business

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Observer-based multivariable fixed-time formation control of mobile robots

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Journal of Systems Engineering and Electronics 2020年第2期31卷 403-414页

作者： LI Yandong ZHU Ling and GUO Yuan College of Computer and Control Engineering Qiqihar UniversityQiqihar 161006China School of Mechanical and Electronic Engineering Qiqihar UniversityQiqihar 161006China

This paper proposes a multivariable fixed-time leaderfollower formation control method for a group of nonholonomic mobile robots, which has the ability to estimate multiple uncertainties. Firstly, based on the state space model of the leader-follower formation, a multivariable fixed-time formation kinematics controller is designed. Secondly, to overcome uncertainties existing in the nonholonomic mobile robot system, such as load change,friction, external disturbance, a multivariable fixed-time torque controller based on the fixed-time disturbance observer at the dynamic level is designed. The designed torque controller is cascaded with the formation controller and finally realizes accurate estimation of the uncertain part of the system, the follower tracking of reference velocity and the desired formation of the leader and the follower in a fixed-time. The fixed-time upper bound is completely determined by the controller parameters, which is independent of the initial state of the system. The multivariable fixed-time control theory and the Lyapunov method are adopted to ensure the system stability.Finally, the effectiveness of the proposed algorithm is verified by the experimental simulation.

关键词： multivariable fixed-time control formation control uncertainty fixed time observer nonholonomic mobile robot

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On Cost Aware Cloudlet Placement for mobile Edge Computing

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IEEE/CAA Journal of Automatica Sinica 2019年第4期6卷 926-937页

作者： Qiang Fan Nirwan Ansari IEEE Advanced Networking Lab Department of Electrical and Computer EngineeringNew Jersey Institute of TechnologyNewarkUSA

As accessing computing resources from the remote cloud inherently incurs high end-to-end(E2E)delay for mobile users,cloudlets,which are deployed at the edge of a network,can potentially mitigate this problem.Although some research works focus on allocating workloads among cloudlets,the cloudlet placement aiming to minimize the deployment cost(i.e.,consisting of both the cloudlet cost and average E2E delay cost)has not been addressed effectively so far.The locations and number of cloudlets have a crucial impact on both the cloudlet cost in the network and average E2E delay of users.Therefore,in this paper,we propose the Cost Aware cloudlet PlAcement in mobile Edge computing(CAPABLE)strategy,where both the cloudlet cost and average E2E delay are considered in the cloudlet placement.To solve this problem,a Lagrangian heuristic algorithm is developed to achieve the suboptimal solution.After cloudlets are placed in the network,we also design a workload allocation scheme to minimize the E2E delay between users and their cloudlets by considering the user mobility.The performance of CAPABLE has been validated by extensive simulations.

关键词： Cloudlet placement mobile cloud computing mobile edge computing

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Coverage-optimization based guidance of mobile agents for improved control of distributed parameter systems

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Journal of Systems Engineering and Electronics 2019年第3期30卷 601-612页

作者： ZHUANG Bo CUI Baotong WU Wei JIANG Zhengxian School of Internet of Things Engineering Jiangnan University Wuxi 214122 China Key Laboratory of Advanced Process Control for Light Industry (Ministry of Education) Wuxi 214122 China

The control problem of a class of parabolic distributed parameter systems (DPSs) is investigated by using mobile agents with capabilities of sensing and actuating. The guidance strategies of mobile agents based on coverage optimization methods are proposed to improve the control performance of the system and make the state norm of the system converge to zero faster. The coverage optimization problems are constructed based on the measurement of each agent. By solving the coverage optimization problems, the local optimal moving direction of each agent can be obtained. Then the gradient-based agent motion control laws are established. With the indicator function and the surface delta function, this method is generalized to n-dimensional space, and suitable for any sensing region with piecewise smooth boundaries. The stability and control performance of the system are analyzed. Numerical simulations show the effectiveness of the proposed methods.

关键词： distributed parameter systems (DPSs) mobile agents coverage optimization indicator function

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mobile device-based Reporting System for Sichuan Earthquake-affected Areas Infectious Disease Reporting in China

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Biomedical and Environmental Sciences 2012年第6期25卷 724-729页

作者： GUO Yan SU Xue Mei National Center for Public Health Surveillance and Information Service Chinese Center for Disease Control andPrevention Beijing 102206 China

Objective To describe the experience of the China CDC in rebuilding reporting capacity and response to the Sichuan earthquake through use of mobile phones. Methods Software engineering and business modeling are used to design and develop a cell phone-based reporting system. The PDA-based system used by the Field Adapted Survey Toolkit （FAST） was deployed Results Approximately one week after deployment of the mobile phone-based reporting system, the cumulative reporting rate reached the same level （81%） as the same period in 2007. In the Sichuan provincial pilot investigation for infectious disease, 1339 records were collected using PDAs developed and deployed by FAST. Conclusion The mobile-based system is recognized as a quick and effective response solution to this public health challenge. Our experience suggests that mobile-based data collection tools provide faster, cleaner, standardized, and shareable data for critical decision making. This system could be adapted as complementary to national infectious disease reporting systems after natural disaster occurrences.

关键词： mobile Earthquake Surveillances

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A review:On path planning strategies for navigation of mobile robot

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Defence Technology（防务技术） 2019年第4期15卷 582-606页

作者： B.K. Patle Ganesh Babu L Anish Pandey D.R.K. Parhi A. Jagadeesh Department of Mechanical Engineering CVR College of Engineering Hyderabad India Department of Mechatronics Engineering Tishik International University Erbil Iraq Department of Mechanical Engineering KITS University Bhubaneshwar India Department of Mechanical Engineering NIT Rourkela India Department of Mechanical Engineering KL University Guntur India

This paper presents the rigorous study of mobile robot navigation techniques used so far.The step by step investigations of classical and reactive approaches are made here to understand the development of path planning strategies in various environmental conditions and to identify research gap.The classical approaches such as cell decomposition(CD),roadmap approach(RA),artificial potential field(APF);reactive approaches such as genetic algorithm(GA),fuzzy logic(FL),neural network(NN),firefly algorithm(FA),particle swarm optimization(PSO),ant colony optimization(ACO),bacterial foraging optimization(BFO),artificial bee colony(ABC),cuckoo search(CS),shuffled frog leaping algorithm(SFLA)and other miscellaneous algorithms(OMA)are considered for study.The navigation over static and dynamic condition is analyzed(for single and multiple robot systems)and it has been observed that the reactive approaches are more robust and perform well in all terrain when compared to classical approaches.It is also observed that the reactive approaches are used to improve the performance of the classical approaches as a hybrid algorithm.Hence,reactive approaches are more popular and widely used for path planning of mobile robot.The paper concludes with tabular data and charts comparing the frequency of individual navigational strategies which can be used for specific application in robotics.

关键词： mobile robot navigation Path planning Classical approaches Reactive approaches Artificial intelligence

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Adaptive network fuzzy inference system based navigation controller for mobile robotAdaptive network fuzzy inference system based navigation controller for mobile robot

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Frontiers of Information Technology & Electronic Engineering 2019年第2期20卷 141-151页

作者： Panati SUBBASH Kil To CHONG Department of Electronics and Information Engineering Chonbuk National University Advanced Electronics and Information Research Center Chonbuk National University

Autonomous navigation of a mobile robot in an unknown environment with highly cluttered obstacles is a fundamental issue in mobile robotics research. We propose an adaptive network fuzzy inference system(ANFIS) based navigation controller for a differential drive mobile robot in an unknown environment with cluttered obstacles. Ultrasonic sensors are used to capture the environmental information around the mobile robot. A training data set required to train the ANFIS controller has been obtained by designing a fuzzy logic based navigation controller. Additive white Gaussian noise has been added to the sensor readings and fed to the trained ANFIS controller during mobile robot navigation, to account for the effect of environmental noise on sensor readings. The robustness of the proposed navigation controller has been evaluated by navigating the mobile robot in three different environments. The performance of the proposed controller has been verified by comparing the travelled path length/efficiency and bending energy obtained by the proposed method with reference mobile robot navigation controllers, such as neural network, fuzzy logic, and ANFIS. Simulation results presented in this paper show that the proposed controller has better performance compared with reference controllers and can successfully navigate in different environments without any collision with obstacles.

关键词： Adaptive network fuzzy inference system Additive white Gaussian noise Autonomous navigation mobile robot

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