Research Methods of Computer-assisted Second Language Acquisition

In this paper, the author presents an overview of the history and trends of the Research Methods in Second Language Acquisition in recent years; and then, combining the present situation in China, indicates that the approach of Action Research will be the future trend in research on Computer Assisted Second Language Acquisition （CASLA）. To explain the author＇s viewpoint, this paper firstly sets out to describe the author＇s understanding of the Research Methods in Second Language Acquisition （SLA）, and then the comprehension of Action Research in CASLA.

Effect of action research-based exercise training guidance on exercise endurance and readmission rate in patients with stable angina pectoris due to coronary heart disease

Background Stable angina pectoris is a common subtype of coronary heart disease.Patients suffer from chest tightness,chest pain and crushing pain under the inducement of fatigue and emotional agitation.This study aims to investigate the effect of exercise training guidance based on action research on exercise endurance and readmission rate of patients with stable angina pectoris.Methods A retrospective study was conducted on 60 patients with stable angina pectoris due to coronary heart disease admitted to our hospital from February 2020 to November 2023.Patients were divided into a control group of 29 cases(receiving conventional exercise training guidance)and a guidance group of 31 cases(receiving action research-based exercise training guidance).Both groups received continuous training for one month.A comparison was made between the exercise endurance indicators[6-minute walk test distance(6MWT),peak oxygen consumption(peak VO2),anaerobic threshold(AT),exercise duration(ED)],quality of life,and readmission rate within 6 months after intervention in both groups.Results After 1 month of intervention,6MWT,peak VO2,AT and ED were increased in both groups,and those in the guidance group were higher than those in the conventional group(P<0.05).The score of quality of life(The 36-item shot-form health status survey,SF-36)in both groups was increased,and the guidance group scored higher than the conventional group(P<0.05).The readmission rate of patients in the guidance group was 6.45%,which was lower than that in the conventional group(27.59%)(P<0.05).Conclusions The application of action research-based exercise training guidance in patients with stable angina pectoris due to coronary heart disease has significant effects,improving exercise endurance,significantly improving quality of life,and reducing readmission rate,thus having practical value.[S Chin J Cardiol 2024;25(3):162-168]

An Improved Adaptive Minimum Action Method for the Calculation of Transition Path in Non-Gradient Systems

The minimum action method(MAM)is to calculate the most probable transition path in randomly perturbed stochastic dynamics,based on the idea of action minimization in the path space.The accuracy of the numerical path between different metastable states usually suffers from the“clustering problem”near fixed points.The adaptive minimum action method(aMAM)solves this problem by relocating image points equally along arc-length with the help of moving mesh strategy.However,when the time interval is large,the images on the path may still be locally trapped around the transition state in a tangle,due to the singularity of the relationship between arc-length and time at the transition state.Additionally,in most non-gradient dynamics,the tangent direction of the path is not continuous at the transition state so that a geometric corner forms,which brings extra challenges for the aMAM.In this note,we improve the aMAM by proposing a better monitor function that does not contain the numerical approximation of derivatives,and taking use of a generalized scheme of the Euler-Lagrange equation to solve the minimization problem,so that both the path-tangling problem and the non-smoothness in parametrizing the curve do not exist.To further improve the accuracy,we apply the Weighted Essentially nonoscillatory(WENO)method for the interpolation to achieve better performance.Numerical examples are presented to demonstrate the advantages of our new method.