As an open-loop model predictive control algorithm,finite control set model predictive control(FCS-MPC)scheme in power converter system is based on assumption that responses of optimal control implemented on predictio...As an open-loop model predictive control algorithm,finite control set model predictive control(FCS-MPC)scheme in power converter system is based on assumption that responses of optimal control implemented on prediction model agree well with actual system.The influence of model parameter mismatches and environment disturbance on control performance of scheme is neglected.Then,based on feedback correction strategy in traditional model predictive control algorithm,we derive a finite control set model predictive control with feedback correction scheme(FCS-MPCFC)that allows us to adjust prediction model output at current instant by model prediction error at previous instant,and the closed-loop correction of prediction model output is achieved.Simulations comparison analyses on a two-level three-phase inverter with multi-type model parameter mismatches controlled by traditional and improved FCS-MPC scheme are presented.Experiments are carried out on DSP controller platform.展开更多
Although substantial research shows the effectiveness of written corrective feedback(WCF)in treating simple grammar structures,more research is still needed to refute Truscott’s claim that WCF may not work on complex...Although substantial research shows the effectiveness of written corrective feedback(WCF)in treating simple grammar structures,more research is still needed to refute Truscott’s claim that WCF may not work on complex grammar structures.Similarly,a previous body of research has shown that the degree of explicitness of feedback moderates the efficacy of WCF.However,most WCF studies have systematically manipulated only direct corrective feedback.The current study was therefore conducted to fill these gaps in the literature.To this end,five intact classes of Functional English were recruited and later randomly assigned to four treatment groups:DCF,DCF+ME,ICF,and ICF+ME,and one control group that received no feedback.All the groups took part in three WCF treatment sessions,during which they wrote two different pieces:a news report and a picture description.Later,only the treatment groups received the WCF.The WCF’s effectiveness was measured by writing tests and grammaticality judgment tasks(GJT).The results demonstrated that WCF helped L2 learners improve their grammatical accuracy of passive voice tenses.The study further showed that the group that received the most explicit type of WCF fared better than the ones that received the least explicit type of WCF.Important pedagogical implications for ESL/EFL teachers are discussed.展开更多
Written feedback in English writing classes serves as the primary mode of feedback.By comparing direct corrective feedback and indirect corrective feedback in addressing content and form,this paper argues that indirec...Written feedback in English writing classes serves as the primary mode of feedback.By comparing direct corrective feedback and indirect corrective feedback in addressing content and form,this paper argues that indirect corrective feedback better aligns with the needs of English majors.Multiple factors influence the choice of written feedback methods,and teachers should carefully select the most appropriate approach based on student characteristics to maximize the effectiveness of feedback.展开更多
The aim of the present study is to explore how native Chinese trainee teachers reflect on their usages of oral corrective feedback in class and what their actual teaching practices are in Chinese as a second language(...The aim of the present study is to explore how native Chinese trainee teachers reflect on their usages of oral corrective feedback in class and what their actual teaching practices are in Chinese as a second language(CSL)classroom.To this end,a mixed-methods approach was adopted in this study,including the questionnaire to explore teachers’perceptions as well as classroom observation to understand teachers’pedagogical practices during class.Fifteen trainee teachers from the same teacher training program in a university in China were identified and recruited to help complete the current research.The present study indicates that in the CSL context,teachers play an essential role in the language classroom and serve as the main resource of classroom feedback.When comparing trainee teachers’stated beliefs to their teaching practices,some similarities could be identified between them,however,clear divergence was also noticeable in the present study.Compared to the previous studies on oral corrective feedback in ESL and EFL contexts,most of the findings in the current study could correspond to those outcomes.The implication emphasizes the importance of offering more support to trainee teachers to help them deal with the complex classroom context such as through teacher training programs.Further investigations on students’perceptions of oral corrective feedback in class would also contribute to the understanding of oral corrective feedback in the CSL context.展开更多
Feedbacks given by teachers is possibly a common instruction in second language writing classes, to help students makeprogress in writing. At one time, feedback was almost entirely at a superficial level--identifying ...Feedbacks given by teachers is possibly a common instruction in second language writing classes, to help students makeprogress in writing. At one time, feedback was almost entirely at a superficial level--identifying the grammatical errors and givingthe correct form. However, recently, this type of feedback has begun to be challenged by some researchers(eg.,Krashen, 1984, Trus-cott, 1996),who argue that teachers should be more concerned with the content of essay instead of grammatical errors. This essaywill discuss some research surrounding feedback to students' writing and will try to find the answer to the question whether the er-ror corrective feedback should be abandoned. In order to find the answer, the essay will elaborate on two parts: some literary reviewabout the issue and some suggested solutions to the issue.展开更多
The present study explored the features and the effectiveness of teachers' oral CF in the classrooms of Teaching English as a Foreign Language(TEFL) for minority students in Xinjiang junior high schools. The analy...The present study explored the features and the effectiveness of teachers' oral CF in the classrooms of Teaching English as a Foreign Language(TEFL) for minority students in Xinjiang junior high schools. The analytical framework of this study consulted Lyster's(1998) coding scheme. 720 minutes of classroom observation were recorded and transcribed. The database was coded and the distribution of errors, CF and uptake was analyzed.展开更多
Considering the primary focus of corrective feedback literature on verbal-correction provided by teachers and lack of attention to the role of other forms of corrective feedback in FL （foreign language） classroom in...Considering the primary focus of corrective feedback literature on verbal-correction provided by teachers and lack of attention to the role of other forms of corrective feedback in FL （foreign language） classroom interaction, this paper demonstrates how essential teachers＇ non-verbal communication and stance display are in making students＇ errors noticeable for them by providing samples from videotaped data. The findings in this study provide insights into the use of non-verbal behavior in providing students with corrective feedback. This study shows that research dealing only with verbal corrections provided by FL teachers cannot fully define the classroom interaction in terms of teachers＇ use of error correction techniques and student notification and uptake.展开更多
Set at the interface between second language acquisition and second language writing,this study examines how different types of written corrective feedback(WCF)influence the writing accuracy of Chinese college student...Set at the interface between second language acquisition and second language writing,this study examines how different types of written corrective feedback(WCF)influence the writing accuracy of Chinese college students learning English as a Foreign Language(EFL)and whether WCF facilitates the students’grasp of the focused linguistic knowledge.The participants(n=60)were divided into direct correction group(n=20),indirect error-coding group(n=20)and metalinguistic explanation group(n=20).The three groups wrote four essays in two months and received WCF for the first three essays on the five targeted error types,namely tense errors,confusion of different forms of a word,word(articles,prepositions,etc.)missing,errors in subjectverb agreement and inappropriate verb-noun collocations.The results show that all three types of WCF improved students’writing accuracy but none of them had any statistical advantage,and the metalinguistic WCF was more effective than the other two forms in facilitating the acquisition of the targeted linguistic features.These results shed some light on teaching and consolidation of language points through writing in EFL contexts.展开更多
Corrective feedback on writing(WCF)has been one of the most controversial topics in ESL/EFL teaching.In the past decades,much has been disputed regarding the effectiveness and preferences of the quantity,focus,directn...Corrective feedback on writing(WCF)has been one of the most controversial topics in ESL/EFL teaching.In the past decades,much has been disputed regarding the effectiveness and preferences of the quantity,focus,directness and source of WCF.With so much uncertainty,the researcher set out to investigate how research-informed secondary school teachers in Macao reported their beliefs,rationales,practices and constraints of administering corrective feedback for EFL writing in Macao secondary schools.Twelve secondary school teachers were recruited at a TESOL conference to conduct focus-group discussions.Similar to previous findings,results suggest teachers had clear rationales as to their ways of practising WCF.However,many expressed difficulties in acting according to rationales and beliefs.Despite their experience and knowledge,practical constraints such as school policies and teacher workload made it unlikely for them to follow their thoughts with feedback on writing.This study identified six sources of constraints that could prohibit practices and potentially reshape ones’beliefs,which sheds light on future directions of WCF research.展开更多
Corrective feedback is crucial for pronunciation teaching.However,in current pronunciation teaching practice,the corrective feedback provided usually fails to locate pronunciation problems and inform learners of the d...Corrective feedback is crucial for pronunciation teaching.However,in current pronunciation teaching practice,the corrective feedback provided usually fails to locate pronunciation problems and inform learners of the differences between their mispronunciations and the correct form.Based on the motor theory,this study attempted to explore a new way of corrective feedback for pronunciation teaching.Specifically,the learners’ speech output was modified and then was played back to them as an input model for learning.In this way,the learners can imitate the pronunciation model of their own voices,achieving self-imitation.This study included two experiments.The first explored the viability of obtaining one’s self-perceived voice through delayed feedback paradigm.The second experiment examined the effectiveness of self-imitation for English intonation learning.Results showed that imitating the pronunciation model of one’s own voice can reduce the learners’ phonological memory load,assist critical listening and facilitate accurate phonetic realizations of the target intonation.展开更多
Currently, there are a variety of researches on corrective feedback, especially on recasts. Most of researches are experiment-based and depend on the certain context. This paper addresses the question of ＂Is recast t...Currently, there are a variety of researches on corrective feedback, especially on recasts. Most of researches are experiment-based and depend on the certain context. This paper addresses the question of ＂Is recast the most effective form of corrective feedback？＂ by two of Second Language Acquisition （SLA） approaches： cognitive approach and sociolinguistic approach. Empirical research will be used as complement. Theoretically speaking, SLA hypotheses in cognitive approach exist disagreements. Interaction hypothesis favors recast while both input hypothesis and output hypothesis doubt the effectiveness of it. Sociolinguistic approach underscores the significance of appropriate and timely corrective feedback and does not give more credit to certain strategy. Both approaches provide the pedagogical implications and elements to take into account for adopting recasts.展开更多
Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find wh...Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find whether the feedback can help L2 writers improve the accuracy of their writing. Similar to the previously discussed question, they have also reached rather controversial conclusions. Most often, these studies have categorized corrective feedback as either direct or indirect. To explore the effects of corrective feedback in L2 writing, the paper investigated the types of feedback given to 30 college students of Tianhe College in Guangdong province. The study improved that correction feedback can improve accuracy in student writing.展开更多
Integrated English Course in Chinese universities serves a group of non-English major students for the main educational training purpose of second language learning together with language learning skills development u...Integrated English Course in Chinese universities serves a group of non-English major students for the main educational training purpose of second language learning together with language learning skills development under different unit themes.In the process of learning another language,as language leaners,making mistakes is natural and inevitable.This procedure of making mistakes and correcting mistakes contribute to the gradual improvement from a starter to an advanced learner.Encountering mistakes made in various conditions in the classroom,teachers need to form proper awareness,and give appropriate feedback.展开更多
Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study...Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study aims to investigate corrective feedback and draw enlightening conclusions:1) Different corrective feedback types have different effects on second language acquisition; 2)The effect of corrective feedback is also influenced by the feedback timing, explicitness of the feedback and learners' individual differences; 3) Teachers should consider feedback types, feedback timing, and individual differences of students based on teaching contents when providing corrective feedback in foreign language teaching.展开更多
From the perspective of individual learner differences,this paper aims to show the readers an outline of the influence of individual learner differences on written corrective feedback.Based on 200 eighth and ninth gra...From the perspective of individual learner differences,this paper aims to show the readers an outline of the influence of individual learner differences on written corrective feedback.Based on 200 eighth and ninth grade junior high school students’thinking patterns and tests,60 students were selected as subjects in this study.Based on the comparative analysis and error analysis in second language acquisition as the main theoretical basis,this study analyzed the common types of errors in the use of nonpredicate verbs in junior high school students and their causes.There are three main questions in this study:how about the error frequency of the five forms(present participle,past participle,infinitive,gerund and independent nominative structure)in the nonpredicate verb learning of junior high school students?What kind of mistakes do junior high school students make in the process of learning non-predicate verbs?According to the conclusion of the investigation and research,the author puts forward some suggestions from the aspects of teachers and students in the last part of the article.展开更多
基金This work was supported in part by the Natural Science Foundation of Hunan Province,China under Grant 2015JJ6070。
文摘As an open-loop model predictive control algorithm,finite control set model predictive control(FCS-MPC)scheme in power converter system is based on assumption that responses of optimal control implemented on prediction model agree well with actual system.The influence of model parameter mismatches and environment disturbance on control performance of scheme is neglected.Then,based on feedback correction strategy in traditional model predictive control algorithm,we derive a finite control set model predictive control with feedback correction scheme(FCS-MPCFC)that allows us to adjust prediction model output at current instant by model prediction error at previous instant,and the closed-loop correction of prediction model output is achieved.Simulations comparison analyses on a two-level three-phase inverter with multi-type model parameter mismatches controlled by traditional and improved FCS-MPC scheme are presented.Experiments are carried out on DSP controller platform.
文摘Although substantial research shows the effectiveness of written corrective feedback(WCF)in treating simple grammar structures,more research is still needed to refute Truscott’s claim that WCF may not work on complex grammar structures.Similarly,a previous body of research has shown that the degree of explicitness of feedback moderates the efficacy of WCF.However,most WCF studies have systematically manipulated only direct corrective feedback.The current study was therefore conducted to fill these gaps in the literature.To this end,five intact classes of Functional English were recruited and later randomly assigned to four treatment groups:DCF,DCF+ME,ICF,and ICF+ME,and one control group that received no feedback.All the groups took part in three WCF treatment sessions,during which they wrote two different pieces:a news report and a picture description.Later,only the treatment groups received the WCF.The WCF’s effectiveness was measured by writing tests and grammaticality judgment tasks(GJT).The results demonstrated that WCF helped L2 learners improve their grammatical accuracy of passive voice tenses.The study further showed that the group that received the most explicit type of WCF fared better than the ones that received the least explicit type of WCF.Important pedagogical implications for ESL/EFL teachers are discussed.
文摘Written feedback in English writing classes serves as the primary mode of feedback.By comparing direct corrective feedback and indirect corrective feedback in addressing content and form,this paper argues that indirect corrective feedback better aligns with the needs of English majors.Multiple factors influence the choice of written feedback methods,and teachers should carefully select the most appropriate approach based on student characteristics to maximize the effectiveness of feedback.
文摘The aim of the present study is to explore how native Chinese trainee teachers reflect on their usages of oral corrective feedback in class and what their actual teaching practices are in Chinese as a second language(CSL)classroom.To this end,a mixed-methods approach was adopted in this study,including the questionnaire to explore teachers’perceptions as well as classroom observation to understand teachers’pedagogical practices during class.Fifteen trainee teachers from the same teacher training program in a university in China were identified and recruited to help complete the current research.The present study indicates that in the CSL context,teachers play an essential role in the language classroom and serve as the main resource of classroom feedback.When comparing trainee teachers’stated beliefs to their teaching practices,some similarities could be identified between them,however,clear divergence was also noticeable in the present study.Compared to the previous studies on oral corrective feedback in ESL and EFL contexts,most of the findings in the current study could correspond to those outcomes.The implication emphasizes the importance of offering more support to trainee teachers to help them deal with the complex classroom context such as through teacher training programs.Further investigations on students’perceptions of oral corrective feedback in class would also contribute to the understanding of oral corrective feedback in the CSL context.
文摘Feedbacks given by teachers is possibly a common instruction in second language writing classes, to help students makeprogress in writing. At one time, feedback was almost entirely at a superficial level--identifying the grammatical errors and givingthe correct form. However, recently, this type of feedback has begun to be challenged by some researchers(eg.,Krashen, 1984, Trus-cott, 1996),who argue that teachers should be more concerned with the content of essay instead of grammatical errors. This essaywill discuss some research surrounding feedback to students' writing and will try to find the answer to the question whether the er-ror corrective feedback should be abandoned. In order to find the answer, the essay will elaborate on two parts: some literary reviewabout the issue and some suggested solutions to the issue.
文摘The present study explored the features and the effectiveness of teachers' oral CF in the classrooms of Teaching English as a Foreign Language(TEFL) for minority students in Xinjiang junior high schools. The analytical framework of this study consulted Lyster's(1998) coding scheme. 720 minutes of classroom observation were recorded and transcribed. The database was coded and the distribution of errors, CF and uptake was analyzed.
文摘Considering the primary focus of corrective feedback literature on verbal-correction provided by teachers and lack of attention to the role of other forms of corrective feedback in FL （foreign language） classroom interaction, this paper demonstrates how essential teachers＇ non-verbal communication and stance display are in making students＇ errors noticeable for them by providing samples from videotaped data. The findings in this study provide insights into the use of non-verbal behavior in providing students with corrective feedback. This study shows that research dealing only with verbal corrections provided by FL teachers cannot fully define the classroom interaction in terms of teachers＇ use of error correction techniques and student notification and uptake.
文摘Set at the interface between second language acquisition and second language writing,this study examines how different types of written corrective feedback(WCF)influence the writing accuracy of Chinese college students learning English as a Foreign Language(EFL)and whether WCF facilitates the students’grasp of the focused linguistic knowledge.The participants(n=60)were divided into direct correction group(n=20),indirect error-coding group(n=20)and metalinguistic explanation group(n=20).The three groups wrote four essays in two months and received WCF for the first three essays on the five targeted error types,namely tense errors,confusion of different forms of a word,word(articles,prepositions,etc.)missing,errors in subjectverb agreement and inappropriate verb-noun collocations.The results show that all three types of WCF improved students’writing accuracy but none of them had any statistical advantage,and the metalinguistic WCF was more effective than the other two forms in facilitating the acquisition of the targeted linguistic features.These results shed some light on teaching and consolidation of language points through writing in EFL contexts.
文摘Corrective feedback on writing(WCF)has been one of the most controversial topics in ESL/EFL teaching.In the past decades,much has been disputed regarding the effectiveness and preferences of the quantity,focus,directness and source of WCF.With so much uncertainty,the researcher set out to investigate how research-informed secondary school teachers in Macao reported their beliefs,rationales,practices and constraints of administering corrective feedback for EFL writing in Macao secondary schools.Twelve secondary school teachers were recruited at a TESOL conference to conduct focus-group discussions.Similar to previous findings,results suggest teachers had clear rationales as to their ways of practising WCF.However,many expressed difficulties in acting according to rationales and beliefs.Despite their experience and knowledge,practical constraints such as school policies and teacher workload made it unlikely for them to follow their thoughts with feedback on writing.This study identified six sources of constraints that could prohibit practices and potentially reshape ones’beliefs,which sheds light on future directions of WCF research.
文摘Corrective feedback is crucial for pronunciation teaching.However,in current pronunciation teaching practice,the corrective feedback provided usually fails to locate pronunciation problems and inform learners of the differences between their mispronunciations and the correct form.Based on the motor theory,this study attempted to explore a new way of corrective feedback for pronunciation teaching.Specifically,the learners’ speech output was modified and then was played back to them as an input model for learning.In this way,the learners can imitate the pronunciation model of their own voices,achieving self-imitation.This study included two experiments.The first explored the viability of obtaining one’s self-perceived voice through delayed feedback paradigm.The second experiment examined the effectiveness of self-imitation for English intonation learning.Results showed that imitating the pronunciation model of one’s own voice can reduce the learners’ phonological memory load,assist critical listening and facilitate accurate phonetic realizations of the target intonation.
文摘Currently, there are a variety of researches on corrective feedback, especially on recasts. Most of researches are experiment-based and depend on the certain context. This paper addresses the question of ＂Is recast the most effective form of corrective feedback？＂ by two of Second Language Acquisition （SLA） approaches： cognitive approach and sociolinguistic approach. Empirical research will be used as complement. Theoretically speaking, SLA hypotheses in cognitive approach exist disagreements. Interaction hypothesis favors recast while both input hypothesis and output hypothesis doubt the effectiveness of it. Sociolinguistic approach underscores the significance of appropriate and timely corrective feedback and does not give more credit to certain strategy. Both approaches provide the pedagogical implications and elements to take into account for adopting recasts.
文摘Since the process writing was raised in the L2 writing in 1970s, the feedback has been an important part of teaching. A range of researchers have investigated the effect of different types of error feedback to find whether the feedback can help L2 writers improve the accuracy of their writing. Similar to the previously discussed question, they have also reached rather controversial conclusions. Most often, these studies have categorized corrective feedback as either direct or indirect. To explore the effects of corrective feedback in L2 writing, the paper investigated the types of feedback given to 30 college students of Tianhe College in Guangdong province. The study improved that correction feedback can improve accuracy in student writing.
文摘Integrated English Course in Chinese universities serves a group of non-English major students for the main educational training purpose of second language learning together with language learning skills development under different unit themes.In the process of learning another language,as language leaners,making mistakes is natural and inevitable.This procedure of making mistakes and correcting mistakes contribute to the gradual improvement from a starter to an advanced learner.Encountering mistakes made in various conditions in the classroom,teachers need to form proper awareness,and give appropriate feedback.
文摘Corrective feedback is an important part of second language acquisition, and many researches have showed that the corrective feedback in general have a positive effect on second language acquisition. The present study aims to investigate corrective feedback and draw enlightening conclusions:1) Different corrective feedback types have different effects on second language acquisition; 2)The effect of corrective feedback is also influenced by the feedback timing, explicitness of the feedback and learners' individual differences; 3) Teachers should consider feedback types, feedback timing, and individual differences of students based on teaching contents when providing corrective feedback in foreign language teaching.
文摘From the perspective of individual learner differences,this paper aims to show the readers an outline of the influence of individual learner differences on written corrective feedback.Based on 200 eighth and ninth grade junior high school students’thinking patterns and tests,60 students were selected as subjects in this study.Based on the comparative analysis and error analysis in second language acquisition as the main theoretical basis,this study analyzed the common types of errors in the use of nonpredicate verbs in junior high school students and their causes.There are three main questions in this study:how about the error frequency of the five forms(present participle,past participle,infinitive,gerund and independent nominative structure)in the nonpredicate verb learning of junior high school students?What kind of mistakes do junior high school students make in the process of learning non-predicate verbs?According to the conclusion of the investigation and research,the author puts forward some suggestions from the aspects of teachers and students in the last part of the article.
