Finite Control Set Model Predictive Control with Feedback Correction for Power Converters

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.

Teachers' Oral Corrective Feedback and Its Influence on Learner Uptake in the Classes of Teaching English as a Foreign Language for Minority Students in Xinjiang Junior High Schools

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.

The Role of Non-verbal Behavior of Teachers in Providing Students Corrective Feedback and Their Consequences

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.

Effects of Written Corrective Feedback on College EFL Students’Writing Accuracy and Linguistic Knowledge Acquisition

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.

Macao Secondary School EFL Teachers' Perspectives on Written Corrective Feedback: Rationales and Constraints

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.

Achieving Self-Imitation for English Intonation Learning:The Role of Corrective Feedback

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.

Error Correction and Feedback in Second Language Acquisition

This paper is aimed at investigating the different ways of English teachers correcting errors in second language acquisition in classroom and offering constructive pedagogical proposal on error correction in oral English class. Transcripts totaling450 minutes of classroom interaction taken from 5 non-native English classes of different types(reading, writing, speaking, and integrated English learning) were analyzed on error correction and feedback in second language acquisition. Results include the frequency and distribution of the six different feedback types used by five teachers. The findings here illustrate an overwhelming tendency for teachers to use recasts in class. Four other feedback types-elicitation, metalinguistic feedback, clarification request,and repetition—lead to student-generated repair more successfully and are thus able to initiate what the authors characterize as the negotiation of form.

Is Recast the Most Effective Type of Corrective Feedback？ --Under Cognitive and Sociolinguistic Approach

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.

The Effect of Different Types of Corrective Feedback on L2 Writing Accuracy of college students

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.

The Application of Corrective Feedback Theory in Integrated English Course

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.

Evaluating Chinese College Students' English Compositions:Different Writing Corrective Feedbacks between a Chinese Teacher and a Foreign Teacher & the Attitudes of College Students

The study aims to uncover the differences between a Chinese writing teacher and a foreign writing teacher in evaluating Chinese college students' English compositions and find out students' attitudes towards different kinds of feedbacks. The data collection method, sample analysis and questionnaire have been implemented to probe for the results. The results are supposed to give some suggestions to the English writing class in Chinese universities.

Research on Corrective Feedback in Foreign Language Teaching

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.

Discussion about the Side Effect of Error Corrective Feedback and Possible Alternatives to Error Correction

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.

The Effects of Learner’s Individual Differences on the Written Corrective Feedback

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.

Effectiveness of Corrective Feedback on Writing

This study aims to find out the effectiveness of corrective feedback on ESL writing.By reviewing and analyzing the previous six research studies,the author tries to reveal the most effective way to provide corrective feedback for L2 students and the factors that impact the processing of error feedback.Findings indicated that corrective feedback is helpful for students to improve ESL writing on both accuracy and fluency.Furthermore,correction and direct corrective feedbacks as well as the oral and written meta-linguistic explanation are the most effective ways to help students improving their writing.However,in dividual learner's difference has influence on processing corrective feedback.At last,limitation of present study and suggestion for future research were made.

Analysis of the Role and Technique of Feedback in the Development of Students’ Writing Skills

Feedback on writing can be defined as comments, corrections, questions and suggestions, that a reader gives to a writer with the aim to steer him through the process of writing on to the product, according to Keh (1990:294). This paper discusses the role of feedback in a process-focused approach to writing. The use of both peer feedback and teacher feedback could improve students'writing skills effectively in the long run. This paper also looks at the different techniques that a teacher can use in the writing classroom.

The Investigation on Peer Correction

Teacher correction, Peer correction and self-correction on student writing are three effective methods which have been advocated for the second language learners. Peer correction, which is widely used in student-centred class, gives students opportunities to propose feedback to their classmates. The investigation on Peer correction can give educators instructions on the use of writing feedback activities as a means of enhancing learner’s writing ability. Through conducting a study on a practical writing class of peer correction, the educators can develop learners’autonomy by transferring learning responsibility from teachers to stu? Dents and develop learners’writing proficiency.

同伴纠正性反馈效果研究综述

反馈(feedback)最早来源于控制论。在教育教学中,有效反馈可以促进学习者的学习与发展。反馈可分为正反馈和负反馈,其中纠正性反馈属于负反馈的重要分支。纠正性反馈根据不同来源可分为教师纠正性反馈、同伴纠正性反馈和自我纠正性反馈。文中聚焦同伴纠正性反馈,将自我效能感、社会文化和认知互动作为理论支撑,以学习者投入这一概念为切入点,回顾并总结同伴纠正性反馈对学习者情感、行为和认知投入三个维度的有效性:学习者因为对同伴纠正性反馈有兴趣,进而提高其学习自信、增强学习内在动机;反馈者和被反馈者均通过同伴纠正性反馈提升个人学习能力;学习者通过识别修正错误、监控学习过程,促进意义创建和知识构建,进而提升个人认知水平。最后概括并归纳同伴纠正性反馈的局限性,对未来的研究方向提供建议。

Effective Error Correction in Writing in An EFLclassroom

Error correction in writing is effective in an English as a foreign language (EFL) learning context, as error correction is an essential means of accuracy improvement in EFL writing. Studies of error correction show that error correction is benefitial for EFL writers not only in the short term but also in the long run.