In daily communication between teachers and students,many Chinese teachers fail to use politeness principle tactfully or appropriately.This article analyzes some basic principles of politeness and their application in...In daily communication between teachers and students,many Chinese teachers fail to use politeness principle tactfully or appropriately.This article analyzes some basic principles of politeness and their application in teachers-students communication.展开更多
The harmony of a relationship between teachers and students is a powerful promotion to the students' mental health. A "shared" relationship between teachers and students is advocated now. In the construction of a h...The harmony of a relationship between teachers and students is a powerful promotion to the students' mental health. A "shared" relationship between teachers and students is advocated now. In the construction of a harmonious relationship between teachers and students, the positions of the teachers and students in teaching should be first made clear, and then an effective mental communication between teachers and students is necessarily available.展开更多
Predicting the displacement of landslide is of utmost practical importance as the landslide can pose serious threats to both human life and property.However,traditional methods have the limitation of random selection ...Predicting the displacement of landslide is of utmost practical importance as the landslide can pose serious threats to both human life and property.However,traditional methods have the limitation of random selection in sliding window selection and seldom incorporate weather forecast data for displacement prediction,while a single structural model cannot handle input sequences of different lengths at the same time.In order to solve these limitations,in this study,a new approach is proposed that utilizes weather forecast data and incorporates the maximum information coefficient(MIC),long short-term memory network(LSTM),and attention mechanism to establish a teacher-student coupling model with parallel structure for short-term landslide displacement prediction.Through MIC,a suitable input sequence length is selected for the LSTM model.To investigate the influence of rainfall on landslides during different seasons,a parallel teacher-student coupling model is developed that is able to learn sequential information from various time series of different lengths.The teacher model learns sequence information from rainfall intensity time series while incorporating reliable short-term weather forecast data from platforms such as China Meteorological Administration(CMA)and Reliable Prognosis(https://rp5.ru)to improve the model’s expression capability,and the student model learns sequence information from other time series.An attention module is then designed to integrate different sequence information to derive a context vector,representing seasonal temporal attention mode.Finally,the predicted displacement is obtained through a linear layer.The proposed method demonstrates superior prediction accuracies,surpassing those of the support vector machine(SVM),LSTM,recurrent neural network(RNN),temporal convolutional network(TCN),and LSTM-Attention models.It achieves a mean absolute error(MAE)of 0.072 mm,root mean square error(RMSE)of 0.096 mm,and pearson correlation coefficients(PCCS)of 0.85.Additionally,it exhibits enhanced prediction stability and interpretability,rendering it an indispensable tool for landslide disaster prevention and mitigation.展开更多
With the reform of experimental teaching in colleges and universities,the teaching mode of"experimental students as the main body,experimental teachers as the guide"needs to constantly explore new experiment...With the reform of experimental teaching in colleges and universities,the teaching mode of"experimental students as the main body,experimental teachers as the guide"needs to constantly explore new experimental teaching methods.In this paper,knowledge graph is integrated into the experiment of mechanical principle to guide undergraduates to use knowledge graph to analyze and summarize independently in experimental teaching activities,aiming at cultivating undergraduates interest in learning and innovative thinking,so as to improve the quality of experimental teaching.This study has a certain reference significance for experimental teaching in colleges and universities.展开更多
To become a qualified EFL (English as a Foreign Language) student teacher who can take an English teaching job in primary or high school after graduation, he or she must learn and use teacher knowledge inside and ou...To become a qualified EFL (English as a Foreign Language) student teacher who can take an English teaching job in primary or high school after graduation, he or she must learn and use teacher knowledge inside and outside the classroom. Adopting a narrative research, this paper discusses eight excellent EFL student teachers' perception of affordances for learning to teaching beyond the classroom based on the theories of affordance and niche. The results show that perceiving many affordances for learning to teach in their niches is of great significance for student teachers to improve their teaching competence. To make student teachers become qualified, we teacher trainers should not ignore the importance of leaming-to-teach beyond the classroom.展开更多
This paper discusses the effectiveness of action research by student teachers during their practicum. Following the review of literature and the presentation of the advantages of action research by student teachers, t...This paper discusses the effectiveness of action research by student teachers during their practicum. Following the review of literature and the presentation of the advantages of action research by student teachers, the paper suggests a three-phased action research process in student teachers' practicum. In China, initiating student teachers into an action research approach in teacher preparation programmes, which offers a way to narrow the theory-practice gap, a big problem to student teachers, can effectively integrate professional knowledge and classroom teaching practice and prepare them for the complex role they will face in today's world.展开更多
To learn English idioms well is not easy for native speakers, let alone ESL/EFL learners, which is because the meanings of idiomatic expressions cannot be determined through an analysis of their individual word meanin...To learn English idioms well is not easy for native speakers, let alone ESL/EFL learners, which is because the meanings of idiomatic expressions cannot be determined through an analysis of their individual word meanings. However, the frequency of figurative languages is very common in English world. So, it is necessary for us to have such knowledge of English idioms in English study. Based on literature review, few studies focused their attention on examining vocational colleges EFL problems in English idioms. Moreover, fewer studies provided quantitative data to demonstrate the problems. Understanding the original texts in one language is the key to accurate translation of another language. Translation may be a good way to examine whether students understand English idioms. Thus, the aim of the present study was to investigate vocational college students' understanding level of English idioms through their translation in order to find how difficult English idioms are for them. Participants were 36 sophomore students who study at Jiaxing Vocational and Technical College. Student's total errors of Chinese translations could be found through the coding as well as the total accurate number of Chinese translations. The findings suggest these students' understanding level of English idioms is not high. It is further supported by the fact that English idioms are difficult and not translated easily from one language to another language.展开更多
There is a popular notion of teachers that they judge a student according to their score. On this basis, teachers developed a systematical thinking method, perspective and way of act. Currently, teachers arrange seats...There is a popular notion of teachers that they judge a student according to their score. On this basis, teachers developed a systematical thinking method, perspective and way of act. Currently, teachers arrange seats and interact with students and do many other things according to their score sub-consciously. This phenomenon, however, has a long-standing basis on which the school evaluates teachers and teachers evaluate themselves.展开更多
The balance theory was supposed in 1950s,and it provides the theory basis for optimizing the classroom teaching.By applying this theory,we discuss how to keep balance among teacher,students and teaching material.This ...The balance theory was supposed in 1950s,and it provides the theory basis for optimizing the classroom teaching.By applying this theory,we discuss how to keep balance among teacher,students and teaching material.This paper aims to keep these three factors in an open,dynamic and balanced system so as to guarantee the successful classroom teaching.展开更多
Non-English majors' evaluation on teachers is a vital way to get feedback of English language classroom teaching and learning. This paper reports on a study which used a discourse-analytic approach to look into the e...Non-English majors' evaluation on teachers is a vital way to get feedback of English language classroom teaching and learning. This paper reports on a study which used a discourse-analytic approach to look into the existing problems in English classroom teaching at undergraduates' level. The ways of searching solutions for the problems are also discussed.展开更多
How could we have a effective teaching?We,as teachers,always think about this question and always hope to have better experiences to supple- ment us.The art of teaching lies in the teaching of the teacher and the stud...How could we have a effective teaching?We,as teachers,always think about this question and always hope to have better experiences to supple- ment us.The art of teaching lies in the teaching of the teacher and the studying of the students.During this course, a teacher's quality will be re- garded as an important factor in the art of teaching which we have to think over and discuss.Of course,the factors of students will be undoubtedly tak- en into consideration because of their significance.HereⅠwould like to sunmaarize the following points to improve our teaching effect.展开更多
The paper states the importance of affective factors by practice of affective teaching. Affective factors can not only promote students' cognitive development, potential exploration and moral cultivation but also ben...The paper states the importance of affective factors by practice of affective teaching. Affective factors can not only promote students' cognitive development, potential exploration and moral cultivation but also benefit students' development of socialization and aesthetic conceptions. So, earing for affeetive education in English teaching has a profound significance.展开更多
This article contributes to the widening of the international literature concerning the teacher-student relationship under different perspectives:cross-cultural,statistical,and applicative.This work strengthens the ps...This article contributes to the widening of the international literature concerning the teacher-student relationship under different perspectives:cross-cultural,statistical,and applicative.This work strengthens the psychometric basis of the Student-Teacher Relationship Scale by confirming the three-dimensional structure of the original instrument.Therefore,on the basis of the factor analysis,the instrument proves to apply also to the Vietnamese context.The Student-Teacher Relationship Scale,given its validity,can be a serviceable tool for studying such a construct,both as a monitoring scale of a given relationship and as a way to help teachers achieve a better level of awareness of their educational skills.展开更多
Teaching mathematics is complex.The changing role of the teacher and the increased demands and expectations placed upon mathematics teachers in the 21st century in South Africa significantly influence the types of kno...Teaching mathematics is complex.The changing role of the teacher and the increased demands and expectations placed upon mathematics teachers in the 21st century in South Africa significantly influence the types of knowledge and skills they require in their undergraduate education and professional development.Reflection,as an aspect of metacognitive awareness,enables teachers to think with what they know in learning about teaching and it is therefore an essential characteristic of professional development of mathematics student teachers.Adapted lesson study and literature regarding metacognitive awareness and reflection were implemented in a mathematics didactics course.In this qualitative interpretative case study,the levels of reflections(guided by reflective prompts)and metacognitive awareness in the reflections of one student teacher(Anne)in a mathematics didactics course were collected,analysed,and interpreted(as part of a bigger study).Anne gave evidence in her reflections of her personal insight on her task(teaching),the learners(person)in her classroom,and the teaching-learning strategies(strategies)she had to reflect on the planning,presenting,and evaluating her mathematics lessons.Using adapted lesson study and reflections seems to have facilitated Anne’s metacognitive awareness as well as her professional development as a mathematics teacher.展开更多
The article is commonly about the impact of globalization on participants of pedagogical process in the condition of communication. The globalization leaves its tracks in separate spheres of the educational system as ...The article is commonly about the impact of globalization on participants of pedagogical process in the condition of communication. The globalization leaves its tracks in separate spheres of the educational system as well as it impacts all spheres of modern life. The relation between a teacher and a student differs with its peculiarity in the contemporary life. A pupil or a student differs totally in classifying the information gained in his activity. A modem student demonstrates a special attitude to everyday events and gets an independent position. Such reality demands the teacher of the day to have a very high practice; the necessity of contemporary training in the process of training-education can be marked as the appearance of globalization. It occurs as a demand for globalization as well. All these items after being analyzed bring some conclusions.展开更多
Flipped classroom model led to the transformation of university teachers' teaching role. From the perspective of the sociology of knowledge, the teacher professional development is a process of transformation of the ...Flipped classroom model led to the transformation of university teachers' teaching role. From the perspective of the sociology of knowledge, the teacher professional development is a process of transformation of the role of teachers, and role transformation and the way of actors involved in the knowledge are associated. Participating in knowledge in different ways, role types are also different. Thus, changing the way ofparticipating in knowledge is the basic way to participate in the transformation of the role. Classification of roles is not the classification ofhumans.A social may might play many roles of many types in his life andmay have the function of a variety of roles at the same time. Meanwhile, it can be transferred between characters, especially in the case of depending on the same knowledge system.As long as the ways of involvement are different,the functions and types of roles are also different. University teachers are those who play a variety of roles of knowledge and society, some being the teaching teachers of organization and dissemination of knowledge, some being scientific and teaching teachers who focus on organizing and disseminating knowledge as well as knowledge creation, and knowledge creation and heavy teacher teaching and research, while others are knowledge creation based research teachers. In the field of the sociology of knowledge, university teachers should be scientific teaching roles depending on a deep knowledge and participating in knowledge in a variety of ways. From the perspective of the sociology of knowledge, according to Eph · Znaniecki' s role classification, university teachers participate in knowledge in three ways: teaching, learning and researching. Teaching, learning and researching are relative but different ways of participating in knowledge. State they are relative because itshows teaching can promote learning, learning can promote researching, researching can also promote learning and teaching. The homochromous interaction of teaching, leaming and researching, knowledge is in constant state of development and generation.展开更多
A teacher sitting alongside his/her students taking the same exam is something unheard of in high schools in China.However,in mid-January,over 8,000 high school teach- ers in northeast China’s Shenyang City took part...A teacher sitting alongside his/her students taking the same exam is something unheard of in high schools in China.However,in mid-January,over 8,000 high school teach- ers in northeast China’s Shenyang City took part in the final examination together with their students.This is a first for Shenyang’s education system and a move that is still new to most of China. The exam was organized after the Shenyang Education Bureau decided that monitoring the quality of local education would in future not only cover students but also the teachers.How the teachers do in the examination will be an important criterion in the teaching evaluation system.展开更多
本刊主编和美国教授Bill Hofmann有着频繁的email交流。他们除了共同编写一些书籍之外,还在email中进行日常的“交谈”。最近,在给毛主编的email中,Bill谈到了E-Books。此信息也许对人类的未来具有不可小视的预示性。此email在编辑部传...本刊主编和美国教授Bill Hofmann有着频繁的email交流。他们除了共同编写一些书籍之外,还在email中进行日常的“交谈”。最近,在给毛主编的email中,Bill谈到了E-Books。此信息也许对人类的未来具有不可小视的预示性。此email在编辑部传阅。有人戏言,若干年后,人们读今日之图书,是否会如今人读出土的“竹简”?今日遍布世界各地的图书馆,届时是否会变成“博物馆”?本刊决定刊登Bill教授的这封email。对此,Bill教授又及时发来了email。他称:You may use the message in ESTL.I have added a title and added a fewsentences to the original text.展开更多
This paper offers college teachers practical advice on how to encourage their students to develop effective study skills through previewing their reading texts before class. The advantages and disadvantages of such an...This paper offers college teachers practical advice on how to encourage their students to develop effective study skills through previewing their reading texts before class. The advantages and disadvantages of such an approach are also discussed.展开更多
文摘In daily communication between teachers and students,many Chinese teachers fail to use politeness principle tactfully or appropriately.This article analyzes some basic principles of politeness and their application in teachers-students communication.
文摘The harmony of a relationship between teachers and students is a powerful promotion to the students' mental health. A "shared" relationship between teachers and students is advocated now. In the construction of a harmonious relationship between teachers and students, the positions of the teachers and students in teaching should be first made clear, and then an effective mental communication between teachers and students is necessarily available.
基金This research work is supported by Sichuan Science and Technology Program(Grant No.2022YFS0586)the National Key R&D Program of China(Grant No.2019YFC1509301)the National Natural Science Foundation of China(Grant No.61976046).
文摘Predicting the displacement of landslide is of utmost practical importance as the landslide can pose serious threats to both human life and property.However,traditional methods have the limitation of random selection in sliding window selection and seldom incorporate weather forecast data for displacement prediction,while a single structural model cannot handle input sequences of different lengths at the same time.In order to solve these limitations,in this study,a new approach is proposed that utilizes weather forecast data and incorporates the maximum information coefficient(MIC),long short-term memory network(LSTM),and attention mechanism to establish a teacher-student coupling model with parallel structure for short-term landslide displacement prediction.Through MIC,a suitable input sequence length is selected for the LSTM model.To investigate the influence of rainfall on landslides during different seasons,a parallel teacher-student coupling model is developed that is able to learn sequential information from various time series of different lengths.The teacher model learns sequence information from rainfall intensity time series while incorporating reliable short-term weather forecast data from platforms such as China Meteorological Administration(CMA)and Reliable Prognosis(https://rp5.ru)to improve the model’s expression capability,and the student model learns sequence information from other time series.An attention module is then designed to integrate different sequence information to derive a context vector,representing seasonal temporal attention mode.Finally,the predicted displacement is obtained through a linear layer.The proposed method demonstrates superior prediction accuracies,surpassing those of the support vector machine(SVM),LSTM,recurrent neural network(RNN),temporal convolutional network(TCN),and LSTM-Attention models.It achieves a mean absolute error(MAE)of 0.072 mm,root mean square error(RMSE)of 0.096 mm,and pearson correlation coefficients(PCCS)of 0.85.Additionally,it exhibits enhanced prediction stability and interpretability,rendering it an indispensable tool for landslide disaster prevention and mitigation.
基金Supported by Undergraduate Teaching Research and Reform Project of University of Shanghai for Science and Technology in 2024(JGXM24281&JGXM24263)First-class Undergraduate Course Construction Project of University of Shanghai for Science and Technology in 2024(YLKC202424394).
文摘With the reform of experimental teaching in colleges and universities,the teaching mode of"experimental students as the main body,experimental teachers as the guide"needs to constantly explore new experimental teaching methods.In this paper,knowledge graph is integrated into the experiment of mechanical principle to guide undergraduates to use knowledge graph to analyze and summarize independently in experimental teaching activities,aiming at cultivating undergraduates interest in learning and innovative thinking,so as to improve the quality of experimental teaching.This study has a certain reference significance for experimental teaching in colleges and universities.
文摘To become a qualified EFL (English as a Foreign Language) student teacher who can take an English teaching job in primary or high school after graduation, he or she must learn and use teacher knowledge inside and outside the classroom. Adopting a narrative research, this paper discusses eight excellent EFL student teachers' perception of affordances for learning to teaching beyond the classroom based on the theories of affordance and niche. The results show that perceiving many affordances for learning to teach in their niches is of great significance for student teachers to improve their teaching competence. To make student teachers become qualified, we teacher trainers should not ignore the importance of leaming-to-teach beyond the classroom.
文摘This paper discusses the effectiveness of action research by student teachers during their practicum. Following the review of literature and the presentation of the advantages of action research by student teachers, the paper suggests a three-phased action research process in student teachers' practicum. In China, initiating student teachers into an action research approach in teacher preparation programmes, which offers a way to narrow the theory-practice gap, a big problem to student teachers, can effectively integrate professional knowledge and classroom teaching practice and prepare them for the complex role they will face in today's world.
文摘To learn English idioms well is not easy for native speakers, let alone ESL/EFL learners, which is because the meanings of idiomatic expressions cannot be determined through an analysis of their individual word meanings. However, the frequency of figurative languages is very common in English world. So, it is necessary for us to have such knowledge of English idioms in English study. Based on literature review, few studies focused their attention on examining vocational colleges EFL problems in English idioms. Moreover, fewer studies provided quantitative data to demonstrate the problems. Understanding the original texts in one language is the key to accurate translation of another language. Translation may be a good way to examine whether students understand English idioms. Thus, the aim of the present study was to investigate vocational college students' understanding level of English idioms through their translation in order to find how difficult English idioms are for them. Participants were 36 sophomore students who study at Jiaxing Vocational and Technical College. Student's total errors of Chinese translations could be found through the coding as well as the total accurate number of Chinese translations. The findings suggest these students' understanding level of English idioms is not high. It is further supported by the fact that English idioms are difficult and not translated easily from one language to another language.
文摘There is a popular notion of teachers that they judge a student according to their score. On this basis, teachers developed a systematical thinking method, perspective and way of act. Currently, teachers arrange seats and interact with students and do many other things according to their score sub-consciously. This phenomenon, however, has a long-standing basis on which the school evaluates teachers and teachers evaluate themselves.
文摘The balance theory was supposed in 1950s,and it provides the theory basis for optimizing the classroom teaching.By applying this theory,we discuss how to keep balance among teacher,students and teaching material.This paper aims to keep these three factors in an open,dynamic and balanced system so as to guarantee the successful classroom teaching.
文摘Non-English majors' evaluation on teachers is a vital way to get feedback of English language classroom teaching and learning. This paper reports on a study which used a discourse-analytic approach to look into the existing problems in English classroom teaching at undergraduates' level. The ways of searching solutions for the problems are also discussed.
文摘How could we have a effective teaching?We,as teachers,always think about this question and always hope to have better experiences to supple- ment us.The art of teaching lies in the teaching of the teacher and the studying of the students.During this course, a teacher's quality will be re- garded as an important factor in the art of teaching which we have to think over and discuss.Of course,the factors of students will be undoubtedly tak- en into consideration because of their significance.HereⅠwould like to sunmaarize the following points to improve our teaching effect.
文摘The paper states the importance of affective factors by practice of affective teaching. Affective factors can not only promote students' cognitive development, potential exploration and moral cultivation but also benefit students' development of socialization and aesthetic conceptions. So, earing for affeetive education in English teaching has a profound significance.
文摘This article contributes to the widening of the international literature concerning the teacher-student relationship under different perspectives:cross-cultural,statistical,and applicative.This work strengthens the psychometric basis of the Student-Teacher Relationship Scale by confirming the three-dimensional structure of the original instrument.Therefore,on the basis of the factor analysis,the instrument proves to apply also to the Vietnamese context.The Student-Teacher Relationship Scale,given its validity,can be a serviceable tool for studying such a construct,both as a monitoring scale of a given relationship and as a way to help teachers achieve a better level of awareness of their educational skills.
文摘Teaching mathematics is complex.The changing role of the teacher and the increased demands and expectations placed upon mathematics teachers in the 21st century in South Africa significantly influence the types of knowledge and skills they require in their undergraduate education and professional development.Reflection,as an aspect of metacognitive awareness,enables teachers to think with what they know in learning about teaching and it is therefore an essential characteristic of professional development of mathematics student teachers.Adapted lesson study and literature regarding metacognitive awareness and reflection were implemented in a mathematics didactics course.In this qualitative interpretative case study,the levels of reflections(guided by reflective prompts)and metacognitive awareness in the reflections of one student teacher(Anne)in a mathematics didactics course were collected,analysed,and interpreted(as part of a bigger study).Anne gave evidence in her reflections of her personal insight on her task(teaching),the learners(person)in her classroom,and the teaching-learning strategies(strategies)she had to reflect on the planning,presenting,and evaluating her mathematics lessons.Using adapted lesson study and reflections seems to have facilitated Anne’s metacognitive awareness as well as her professional development as a mathematics teacher.
文摘The article is commonly about the impact of globalization on participants of pedagogical process in the condition of communication. The globalization leaves its tracks in separate spheres of the educational system as well as it impacts all spheres of modern life. The relation between a teacher and a student differs with its peculiarity in the contemporary life. A pupil or a student differs totally in classifying the information gained in his activity. A modem student demonstrates a special attitude to everyday events and gets an independent position. Such reality demands the teacher of the day to have a very high practice; the necessity of contemporary training in the process of training-education can be marked as the appearance of globalization. It occurs as a demand for globalization as well. All these items after being analyzed bring some conclusions.
文摘Flipped classroom model led to the transformation of university teachers' teaching role. From the perspective of the sociology of knowledge, the teacher professional development is a process of transformation of the role of teachers, and role transformation and the way of actors involved in the knowledge are associated. Participating in knowledge in different ways, role types are also different. Thus, changing the way ofparticipating in knowledge is the basic way to participate in the transformation of the role. Classification of roles is not the classification ofhumans.A social may might play many roles of many types in his life andmay have the function of a variety of roles at the same time. Meanwhile, it can be transferred between characters, especially in the case of depending on the same knowledge system.As long as the ways of involvement are different,the functions and types of roles are also different. University teachers are those who play a variety of roles of knowledge and society, some being the teaching teachers of organization and dissemination of knowledge, some being scientific and teaching teachers who focus on organizing and disseminating knowledge as well as knowledge creation, and knowledge creation and heavy teacher teaching and research, while others are knowledge creation based research teachers. In the field of the sociology of knowledge, university teachers should be scientific teaching roles depending on a deep knowledge and participating in knowledge in a variety of ways. From the perspective of the sociology of knowledge, according to Eph · Znaniecki' s role classification, university teachers participate in knowledge in three ways: teaching, learning and researching. Teaching, learning and researching are relative but different ways of participating in knowledge. State they are relative because itshows teaching can promote learning, learning can promote researching, researching can also promote learning and teaching. The homochromous interaction of teaching, leaming and researching, knowledge is in constant state of development and generation.
文摘A teacher sitting alongside his/her students taking the same exam is something unheard of in high schools in China.However,in mid-January,over 8,000 high school teach- ers in northeast China’s Shenyang City took part in the final examination together with their students.This is a first for Shenyang’s education system and a move that is still new to most of China. The exam was organized after the Shenyang Education Bureau decided that monitoring the quality of local education would in future not only cover students but also the teachers.How the teachers do in the examination will be an important criterion in the teaching evaluation system.
文摘本刊主编和美国教授Bill Hofmann有着频繁的email交流。他们除了共同编写一些书籍之外,还在email中进行日常的“交谈”。最近,在给毛主编的email中,Bill谈到了E-Books。此信息也许对人类的未来具有不可小视的预示性。此email在编辑部传阅。有人戏言,若干年后,人们读今日之图书,是否会如今人读出土的“竹简”?今日遍布世界各地的图书馆,届时是否会变成“博物馆”?本刊决定刊登Bill教授的这封email。对此,Bill教授又及时发来了email。他称:You may use the message in ESTL.I have added a title and added a fewsentences to the original text.
文摘This paper offers college teachers practical advice on how to encourage their students to develop effective study skills through previewing their reading texts before class. The advantages and disadvantages of such an approach are also discussed.