检索结果-内蒙古大学图书馆

Maintenance modelling of human behaviour on epidemic transmission

AIP conference Proceedings 2018年第1期1974卷

作者： Siti Nurleena Abu Mansor Adam Baharum Zalila Ali 1School of Mathematical Sciences Universiti Sains Malaysia 11800 USM Penang Malaysia 2Faculty of Computer and Mathematical Sciences Universiti Teknologi MARA Cawangan Pulau Pinang 13500 Permatang Pauh Pulau Pinang Malaysia

Various studies in epidemiology have shown interesting developments in recent years. Models with different approached have successfully described the nature of epidemic transmission and the one of it is the role of human behaviour. Essential to note that changes in behaviour can lead to health condition status of an individual, therefore, maintenance of individual health (eating habits, daily activities, lifestyle, etc.) and environment’s condition are important. This paper presented on the development of maintenance modelling in human behaviour on the epidemic transmission. New developing areas in maintenance modelling such as inspection maintenance and condition based maintenance are systematically modelled and discussed according to the disease dynamic and human behaviour. This effort is hoped to give insight and understanding for future studies in epidemic transmission.

关键词：

来源：评论

学校读者我要写书评

暂无评论

modelling the geographical spread of HIV among MSM in Guangdong, China: a metapopulation model considering the impact of pre-exposure prophylaxis

引用

PHILOSOPHICAL TRANSACTIONS OF THE ROYAL SOCIETY A-mathematical PHYSICAL AND engineering SCIENCES 2022年第2214期380卷 20210126-20210126页

作者： Jing, Fengshi Ye, Yang Zhou, Yi Zhou, Hanchu Xu, Zhongzhi Lu, Ying Tao, Xiaoyu Yang, Shujuan Cheng, Weibin Tian, Junzhang Tang, Weiming Wu, Dan Guangdong Second Prov Gen Hosp Inst Healthcare Artificial Intelligence Guangzhou 510317 Peoples R China Univ North Carolina Project China Guangzhou 510085 Peoples R China City Univ Hong Kong Sch Data Sci Hong Kong Peoples R China Macau Univ Sci & Technol Fac Med Macau Peoples R China Zhuhai Ctr Dis Control & Prevent Zhuhai 519060 Peoples R China Cent South Univ Sch Traff & Transportat Engn Changsha 410075 Peoples R China Univ Hong Kong Hong Kong Jockey Club Ctr Suicide Res & Prevent Hong Kong Peoples R China Sichuan Univ West China Sch Publ Hlth Chengdu 610041 Peoples R China London Sch Hyg & Trop Med Dept Clin Res London WC1E 7HT England

Men who have sex with men (MSM) make up the majority of new human immunodeficiency virus (HIV) diagnoses among young people in China. Understanding HIV transmission dynamics among the MSM population is, therefore, crucial for the control and prevention of HIV infections, especially for some newly reported genotypes of HIV. This study presents a metapopulation model considering the impact of pre-exposure prophylaxis (PrEP) to investigate the geographical spread of a hypothetically new genotype of HIV among MSM in Guangdong, China. We use multiple data sources to construct this model to characterize the behavioural dynamics underlying the spread of HIV within and between 21 prefecture-level cities (i.e. Guangzhou, Shenzhen, Foshan, etc.) in Guangdong province: the online social network via a gay social networking app, the offline human mobility network via the Baidu mobility website, and self-reported sexual behaviours among MSM. Results show that PrEP initiation exponentially delays the occurrence of the virus for the rest of the cities transmitted from the initial outbreak city;hubs on the movement network, such as Guangzhou, Shenzhen, and Foshan are at a higher risk of 'earliest' exposure to the new HIV genotype;most cities acquire the virus directly from the initial outbreak city while others acquire the virus from cities that are not initial outbreak locations and have relatively high betweenness centralities, such as Guangzhou, Shenzhen and Shantou. This study provides insights in predicting the geographical spread of a new genotype of HIV among an MSM population from different regions and assessing the importance of prefecture-level cities in the control and prevention of HIV in Guangdong province. This article is part of the theme issue 'Data science approach to infectious disease surveillance'.

关键词： HIV transmission human mobility data social media data sexual behaviour data MSM

来源：评论

学校读者我要写书评

暂无评论

modelling and Analysis of a Low Cost Brushless DC Motor Drive

Modelling and Analysis of a Low Cost Brushless DC Motor Driv...

引用

IEEE International conference on Industrial Technology

作者： H. K. Samitha Ransara Udaya K. Madawala Department of Electrical and Computer Engineering The University of Auckland Auckland New Zealand

ISBN: (纸本)9781467345675

This paper presents a buck converter based modelling technique for Brushless DC (BLDC) motor drives. The proposed technique is a better alternative to model BLDC motor drives due to its reduced computational complexity in contrast to the conventional phase-variable model. Using the model, constant speed operation of a BLDC motor drive operated without a DC link capacitor is analysed. Theoretical behaviour of the motor drive, predicted from the model, is compared with Matlab/Simulink based simulations to demonstrate the validity of the model. mathematical expressions are derived from the model to evaluate the steady state performance of the BLDC motor drive, which is presented, in comparison to a similar sized conventional BLDC motor drive. The proposed model and mathematical expressions are expected to be useful at the design stage of the low cost motor drive to achieve comparable performance.

关键词： motor drives brushless direct current motor Automobile driving DRIVES dc-link capacitor mathematical Formulas step-down converter Modeling steady-state performance motivation complexity classes

来源：评论

学校读者我要写书评

暂无评论

Assessing Control of Fixed-Support Balance Recovery in Wearable Lower-Limb Exoskeletons Using Multibody Dynamic modelling

Assessing Control of Fixed-Support Balance Recovery in Weara...

引用

IEEE/RAS-EMBS International conference on Biomedical Robotics and Biomechatronics (BioRob)

作者： Keaton A. Inkol John McPhee Department of Systems Design Engineering University of Waterloo 200 University Ave W Canada

ISBN: (数字)9781728159072

ISBN: (纸本)9781728159089

Despite many lower-limb exoskeletons requiring the use of crutches to maintain upright postures, limited research has assessed control of standing balance recovery in these systems. Using a model-based approach, the current simulation study investigated the performance of impedance controllers designed to assist with standing fixed-support balance recovery. A novel multibody dynamic model of the integrated humanexoskeleton system was designed to move in the sagittal plane. Development of the exoskeleton model (Technaid Exo-H3) was accompanied by parameter identification. The balancing torques produced by the human in the model were derived from offline linear control methods and saturated to approximate the torque-production of a young individual either with or without incomplete spinal cord injury. Without intervention, the injured user was not able to recover upright posture following a forward push of specific magnitude. Thus, three feedback control laws, inspired by robotics research (exoskeletons and humanoids), were implemented in the simulated exoskeleton. Each law assisted with balance recovery via reference tracking within the joint and/or whole-body center of mass space. Following optimization of control parameters, all proposed exoskeleton control laws were successful in assisting the injured user return to an upright posture. Joint space control yielded the best jointlevel reference tracking during recovery, while center of mass control better reduced forward center of mass excursions - albeit at the cost of joint-level tracking accuracy.

关键词： Exoskeletons mathematical model Knee Torque Hip Batteries Biological system modeling

来源：评论

学校读者我要写书评

暂无评论

Affective e-learning model for recognising learner emotions in online learning environment

Affective e-learning model for recognising learner emotions ...

引用

International conference on Advances in ICT for Emerging Regions

作者： T. C. Sandanayake A. P. Madurapperuma Faculty of Information Technology University of Moratuwa Katubadda Sri Lanka Department of Electrical and Computer Engineering Open University of Sri Lanka Nawala Sri Lanka

Today online learning provides wider coverage many different approaches such as distance learning, classroom-based electronic learning and self-access learning. Online learning has been recognized as a support tool for educators and researchers simply it gives is luxury of using at anytime, anywhere. Like any learning process, online learning depends on effective communication of human knowledge, whether this occurs in a face-to-face classroom or across the Internet. Emotions can have enormous affects on learning and play a vital role in decision making, managing learning activities, timing, and reflecting on the studies. Emotions are also important in teaching and learning and often find expression in particular ways, such as interactions with others and motivation in learning. The aim of the research is to develop a computational model for recognizing leaner emotions in online learning environment. The research study was focused on developing a tool to recognise the online learner's emotions. Therefore, the study has developed Online Achievement Emotion Questionnaire (AEQ) based on the AEQ which is suited for the online learning environment. Also the study has identified a methodology for recognising learner performances during learning. That has being measured through six parameters which represent the learner's level of learning during the learning experience. These parameters are analysed using multiple regression analysis and a model equation was developed to compute the online learner's level of learning. Finally the study has analysed and evaluated the correlation between the learner emotions and the observed behaviour. This research study therefore developed a novel model of affective online learning which can be use as a tool to recognise online learner's emotions with regard to the performance in learning.

关键词： Electronic learning mathematical model Computational modeling Emotion recognition Reliability Analytical models

来源：评论

学校读者我要写书评

暂无评论

On some new results on mathematical modelling of the human body: A short review

引用

AIP conference Proceedings 2022年第1期2522卷

作者： G. S. Nikolova D. M. Dantchev Institute of Mechanics Bulgarian Academy of Sciences Acad. G. Bonchev str. Bl. 4 1113 Sofia Bulgaria

mathematical modelling is one of the methods for determination of the mass-inertial parameters of different segments of the body, as well as of the whole body. The current article presents a review of some new results obtained via recently suggested 20-segmental 3D mathematical model of the human body. In order to automatize the calculation of the mass inertial parameters of the body in any of its usual positions, and not only for separate segments – which can be analytically performed --- the model has been also generated in a proper computer environment. We report some new data obtained via utilization of the model pertinent to the segments of the body. In addition, we also present a short review of our recent results related to i) a new type of mathematical modelling of the thigh of the human body; ii) investigation of the mass – inertial characteristics in basic body position as selected by NASA; iii) study of mass-inertial parameters during the eight phases of the human gait cycle; iv) a new approach for generation of the upper limb of the human body. The proposed model shall be helpful in engineering, when designing devices aimed to help disabled people. Finally, we outline some additional improvements and future developments of the model. Let us note that the proposed model and its considered modifications are oriented towards applications in medicine (orthopedics and traumatology), rehabilitation robotics, computer simulations, sports, as well as in areas such as ergonomics, simulation of human behaviour in space, forensics (body fall, body impact) and more.

关键词：

来源：评论

学校读者我要写书评

暂无评论

Demand side management and distributed on site actions benefits

Demand side management and distributed on site actions benef...

引用

International conference on Renewable Energy Research and Applications (ICRERA)

作者： L. Dusonchet G. Cipriani C.G. Giaconia D. La Cascia F. Lo Bue F. Massaro R. Miceli Department of Energy Information engineering and Mathematical models (DEIM) University of Palermo Palermo Italy

ISBN: (纸本)9781479914630

Global warming and energy demand are nowadays becoming one of the major issues of the third millennium, mainly because human activities seem to have a clear impact on the raise of CO 2 emissions as never it has been experienced in the past. Among the different factors affecting CO 2 emissions, energy demand from buildings constitutes one of the most important actors. Energy Management (EM) actions can reduce the energy consumption of the system and minimize peaks-level, by using a distributed control over every house. These local actions can greatly contribute to reduce the impact on the global CO 2 emissions. An evaluation of the potential energy saving and CO 2 emissions reduction on buildings and neighbours has been carried out, when a renewable energy system is locally installed. The exploitation of a combined solar and photovoltaic system and the integration of suitable energy management actions were deeply investigated. Savings up to 10% on grid losses in the Medium-Voltage (MV) and Low-Voltage (LV) electrical system is obtainable. A wide-spread application of EM (Energy Management) in houses and buildings could permit benefits for the transmission system and a considerable reduction of CO 2 emission. The results here pointed out suggest the possibility of postponing the development and strengthening of electrical system. The consequent economic relevant benefit could persuade economic lobbies about the importance of EM through connected household appliances. In the paper a grid simulator has been defined with the specific inputs and parameters for modelling the distribution system, both for MV and LV. Results at neighbour and country level are very suitable and verify the relevant role of the CPS (Combined Photovoltaic Solar system) in the whole electric grid.

关键词： Energy consumption Home appliances Photovoltaic systems Load modeling Buildings Renewable energy sources

来源：评论

学校读者我要写书评

暂无评论

Review on Controlling Flexible Robotic Arm - System Identification of Intelligent Evolutionary Algorithm and Dynamic modelling of Mechanical and Hydraulic Manipulator

Review on Controlling Flexible Robotic Arm - System Identifi...

引用

Measurement, Instrumentation, Control and Automation (ICMICA), 2020 First IEEE International conference on

作者： Dhananjay Mishra Jyoti Ohri Electrical Engineering Department National Institute of Technology Kurukshetra Haryana

ISBN: (数字)9798350355048

ISBN: (纸本)9798350355055

Robotics is one of the significant technologies related to "Industrial Revolution 4.0." Robotic arm has got a lot of demand in several industries like manufacturing. It is very important to improve production, output, Return on Investment (ROI), and profitability, and reduce human error. The existing robotic arm used in industries is not just expensive and needs experts for maintenance, it is also very bulky and hard to shift. This is why robotic solution is still out of budget for a lot of small and medium enterprises in emerging economies. Irrespective of those problems, robotics solution is still needed to solve the existing issues related to output quality and *** this day and age, a reliable and versatile robot is needed in manufacturing industry. Robots must be easier to operate with less learning curve. Their user interface should be intuitive and friendly. There is a rise in demand for using stronger, lightweight, and more flexible robotic arm in different areas. However, unwanted vibrations can easily affect light robotic arm which may cause problems like instability, fatigue, and performance issues. Eventually, these problems affect highly stressed environment. This study is based on the development of "intelligent evolutionary algorithm to control flexible robotic arm." This algorithm is designed for "vibration cancellation" and "trajectory planning control" with "intelligent evolutionary algorithms" like "Artificial Bees Colony" and "Particle Swarm Algorithm." These evolutionary algorithms have been tested, implemented, and verified with "robotic arm manipulator experimental rig." These smart controllers were found to perform much better than traditional approaches in terms of trajectory control, input tracking, and vibration cancellation.

关键词： Vibrations Service robots Heuristic algorithms Dynamics Vibration measurement User interfaces mathematical models Velocity measurement Manipulator dynamics Tuning

来源：评论

学校读者我要写书评

暂无评论

The origin and primary areas of application of natural language processing

The origin and primary areas of application of natural langu...

引用

International Symposium on Computational Intelligence and Informatics

作者： Zsolt Krutilla Attila Kovari Doctoral School of Applied Informatics and Applied Mathematics Óbuda University Budapest Hungary Institute of Engineering Alba Regia Technical Faculty Óbuda University Budapest Hungary

ISBN: (纸本)9798350398830

Natural language processing with computers, i.e. NLP, is increasingly gaining ground in today's IT. The purpose of this study is to analyze the articles published in the NLP topic and to summarize it from several aspects, especially with regards to the development and practical application of the technology. The idea of NLP as a technology was not formulated in the 21st century, but already in the 1950s, relevant research was carried out and theories were created regarding how a machine can become capable of interpreting human speech. Technology has come a long way from simple algorithms to Deep Learning, but it has not yet solved the problem of machine processing of natural language. The research has confirmed the idea that mathematical modelling and models based on statistical probability dominated the field in the early days of the discipline and before the advent of computers. However, despite technological progress, no solution has yet been found to the comprehensive and all-encompassing problem of natural language processing with computers. To determine the future research area of NLP, we need to take into account the text files on which the technology is based. From this perspective, we can focus on the insurance and banking sectors, where a series of administrative processes take place where centralized paper processing is the incoming data set of the process and a database going back several years may be available.

关键词： Computers Deep learning Law Computational modeling Decision making Insurance Banking

来源：评论

学校读者我要写书评

暂无评论

Genetic programming approach on evaporation losses and its effect on climate change for Vaipar Basin

引用

International Journal of Computer Science Issues 2011年第5 5-2期8卷 269-274页

作者： Kasiviswanathan, K.S. Pandian, R.Soundhara Raja Saravanan, S. Agarwal, Avinash WRDM IIT Roorkee India IC and SR IIT Madras India Civil Engineering NIT Trichy India Surface water division NIH Roorkee India

Climate change is the major problem that every human being is facing over the world. The rise in fossil fuel usage increases the emission of 'greenhouse' gases, particularly carbon dioxide continuously into the earth's atmosphere. This causes a rise in the amount of heat from the sun withheld in the earth's atmosphere that would normally radiated back into space. This increase in heat has led to the greenhouse effect, resulting in climate change and rise in temperature along with other climatological parameters directly affects evaporation losses. Accurate modelling and forecasting of these evaporation losses are important for preventing further effects due to climate change. Evaporation is purely non-linear and varying both spatially and temporally. This needs suitable data driven approach to model and should have the ability to take care of all these non-linear behaviour of the system. As such, though there are many empirical and analytical models suggested in the literature for the estimation of evaporation losses, such models should be used with care and caution. Further, difficulties arise in obtaining all the climatological data used in a given analytical or empirical model. Genetic programming (GP) is one such technique applied where the non-linearity exist. GP has the flexible mathematical structure which is capable of identifying the non-linear relationship between input and output data sets. Thus, it is easy to construct 'local' models for estimating evaporation losses. The performance of GP model is compared with Thornthwaite method, and results from the study indicate that the GP model performed better than the Thornthwaite method. Forecasting of meteorological parameters such as temperature, relative humidity and wind velocity has been performed using Markovian chain series analysis subsequently it is used to estimate the future evaporation losses using developed GP model. Finally the effect of possible future climate change on evaporation losses in Pil

关键词： Greenhouse effect

来源：评论

学校读者我要写书评

暂无评论

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案：

请选择收藏分类：

通借通还

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：