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INTEGRATED VEHICLE CHASSIS CONTROL WITH A MAIN/SERVO-LOOP STRUCTURE
Li, D.,Shen, X.,Yu, F. The Korean Society of Automotive Engineers 2006 International journal of automotive technology Vol.7 No.7
In order to reduce the negative effects of dynamic coupling among vehicle subsystems and improve the handling performance of vehicle under severe driving conditions, a vehicle chassis control integration approach based on a main-loop and servo-loop structure is proposed. In the main-loop, in order to achieve satisfactory longitudinal, lateral and yaw response, a sliding mode controller is used to calculate the desired longitudinal, lateral forces and yaw moment of the vehicle; and in the servo-loop, a nonlinear optimizing method is adopted to compute the optimal control inputs, i.e. wheel control torques and active steering angles, and thus distributes the forces and moment to four tire/road contact patches. Simulation results indicate that significant improvement in vehicle handling and stability can be expected from the proposed chassis control integration.
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Activity Participation and wellbeing during the covid-19 lockdown in Spain
Rosa Arroyo,Lidón Mars,Tomás Ruiz 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.3
On March 14, 2020, the Spanish authorities declared a lockdown to bending the Covid-19 pandemic curve. People were asked to stay at home as much as possible, students were obliged to attend classes on-line, civil servants were also required to tele-work, and any work activity that could be carried out from home was recommended to do so as well. Non-essential activities like theatres, restaurants, gyms, etc., were closed. Only work that could not be carried out at home, grocery shopping, taking care of others, walking the dog, visiting the doctor, do banking, and a few more out-of-home activities were allowed. Out-of-home leisure and social activities were not permitted at all. Such limitations of out-of-home activities could influence the wellbeing of people. The present study aims to analyse the wellbeing of people considering the limitations of out-of-home activities during the lockdown. Data collected through a web-survey from 1,653 participants is studied in this paper. The information analysed is related to the satisfaction of the basic psychological needs (autonomy, competence and relatedness) and positive and negative affect. Activity-travel data and sociodemographic characteristics are also considered. Mann–Whitney U tests, Confirmatory Factor Analyses and Structural Equation models are used to find out differences in the wellbeing of people according to their out-of-home activity characteristics, and how these activity characteristics are associated to the psychological variables studied. Findings suggest that those who mostly spent their out-of-home time working felt slightly better. However, as time working increased, more negative affect and autonomy frustration appeared. On the other hand, more time doing grocery shopping was associated with positive feelings. In general, women felt somewhat worse, and older participants felt a bit better during the lockdown. Employed respondents felt better than their unemployed counterparts. Some lessons are learned to improve urban planning during a pandemic. On March 14, 2020, the Spanish authorities declared a lockdown to bending the Covid-19 pandemic curve. People were asked to stay at home as much as possible, students were obliged to attend classes on-line, civil servants were also required to tele-work, and any work activity that could be carried out from home was recommended to do so as well. Non-essential activities like theatres, restaurants, gyms, etc., were closed. Only work that could not be carried out at home, grocery shopping, taking care of others, walking the dog, visiting the doctor, do banking, and a few more out-of-home activities were allowed. Out-of-home leisure and social activities were not permitted at all. Such limitations of out-of-home activities could influence the wellbeing of people. The present study aims to analyse the wellbeing of people considering the limitations of out-of-home activities during the lockdown. Data collected through a web-survey from 1,653 participants is studied in this paper. The information analysed is related to the satisfaction of the basic psychological needs (autonomy, competence and relatedness) and positive and negative affect. Activity-travel data and sociodemographic characteristics are also considered. Mann–Whitney U tests, Confirmatory Factor Analyses and Structural Equation models are used to find out differences in the wellbeing of people according to their out-of-home activity characteristics, and how these activity characteristics are associated to the psychological variables studied. Findings suggest that those who mostly spent their out-of-home time working felt slightly better. However, as time working increased, more negative affect and autonomy frustration appeared. On the other hand, more time doing grocery shopping was associated with positive feelings. In general, women felt somewhat worse, and older participants felt a bit better during the lockdown. Employed respondents felt better than their unemployed counterparts. Some lessons are learned to improve urban planning during a pandemic.
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A SUCCESSIVE QUADRATIC PROGRAMMING ALGORITHM FOR SDP RELAXATION OF THE BINARY QUADRATIC PROGRAMMING
MU XUEWEN,LID SANYANG,ZHANG YALING Korean Mathematical Society 2005 대한수학회보 Vol.42 No.4
In this paper, we obtain a successive quadratic programming algorithm for solving the semidefinite programming (SDP) relaxation of the binary quadratic programming. Combining with a randomized method of Goemans and Williamson, it provides an efficient approximation for the binary quadratic programming. Furthermore, its convergence result is given. At last, We report some numerical examples to compare our method with the interior-point method on Maxcut problem.
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THE ENUMERATION OF ROOTED CUBIC C-NETS
CAI, JUNLIANG,HAO, RONGXIA,LID, YANPEI 한국전산응용수학회 2005 Journal of applied mathematics & informatics Vol.18 No.1
This paper is to establish a functional equation satisfied by the generating function for counting rooted cubic c-nets and then to determine the parametric expressions of the equation directly. Meanwhile, the explicit formulae for counting rooted cubic c-nets are derived immediately by employing Lagrangian inversion with one or two parameters. Both of them are summation-free and in which one is just an answer to the open problem (8.6.5) in [1].
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