This paper intends to promote a college English autonomous teaching and learning approach by introducing the whole process of its implementation and feedback from the learners. The theoretical and practical framework ...This paper intends to promote a college English autonomous teaching and learning approach by introducing the whole process of its implementation and feedback from the learners. The theoretical and practical framework of this approach is: with multiple autonomous learning research and practice models as its core, with process syllabus as its guidance, with task-based teaching as its essential principle, with group cooperation and reciprocal learning as its means, with extracurricular activities, online learning and self-access center as its learning environment, with formative assessment system as its guarantee and with cultivation of learners' comprehensive English practical skills and autonomy as its goal. Through this approach, we provide the learners with a favorable learning environment where they can learn by themselves and learn by reflection and practice so that they can learn how to learn and how to behave and how to survive.展开更多
Aim To investigate the model free multi step average reward reinforcement learning algorithm. Methods By combining the R learning algorithms with the temporal difference learning (TD( λ ) learning) algorithm...Aim To investigate the model free multi step average reward reinforcement learning algorithm. Methods By combining the R learning algorithms with the temporal difference learning (TD( λ ) learning) algorithms for average reward problems, a novel incremental algorithm, called R( λ ) learning, was proposed. Results and Conclusion The proposed algorithm is a natural extension of the Q( λ) learning, the multi step discounted reward reinforcement learning algorithm, to the average reward cases. Simulation results show that the R( λ ) learning with intermediate λ values makes significant performance improvement over the simple R learning.展开更多
The new curriculum standard points out that affection is one of the most important goals of fundamental education. The non-target language environment is easier to cause the affective change of middle school students ...The new curriculum standard points out that affection is one of the most important goals of fundamental education. The non-target language environment is easier to cause the affective change of middle school students who are changeable in their affective state. Based on the affective filter hypothesis, this paper deals with the adjustment to affective factors in English learning by using Internet English Curriculum Resource, such as attitude and motivation, anxiety and inhibition, self-esteem and self-confidence. At last, some suggestions are offered to judge Internet English Curriculum Resource.展开更多
This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background k...This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background knowledge plays an important role in enhancing the ability of a learning system. An explanation based learning system with domain theory in primary knowledge base and background knowledge in secondary knowledge base is introduced as an example. It shows how background knowledge can be used to solve some of the problems caused by incomplete domain theory in an explanation based learning system. The system can accomplish knowledge level learning through purely deductive approach. At last the acquisition of background knowledge is briefly discussed.展开更多
Endoscopic submucosal dissection(ESD) is becoming a popular procedure for the diagnosis and treatment of superficial mucosal lesions,and has the advantage of en bloc resection which yields a higher complete resection ...Endoscopic submucosal dissection(ESD) is becoming a popular procedure for the diagnosis and treatment of superficial mucosal lesions,and has the advantage of en bloc resection which yields a higher complete resection and remission rate compared to endoscopic mucosal resection(EMR).However,the learning process of this advanced endoscopic procedure requires a lengthy training period and considerable experience to be proficient.A well framed training protocol which is safe,effective,easily reproducible and cost-effective is desirable to teach ESD.In addition,the training course may need to be tailored around settings such as ethnicity,culture,workload,and disease incidence.In Asian countries with a large volume of early gastric lesions which need endoscopic treatment,endoscopists would be able to learn ESD expanding their skills from EMR to ESD under the supervision of experts.Whereas,in Western countries due to the low incidence of superficial gastric tumors,trials have utilized simulator models to improve learning.In Korea,the Korean Society of Gastrointestinal Endoscopy(KSGE) is playing an important role in training many gastroenterologists who have shown an interest in performing ESD by providing an annual live demonstration and a nationwide tutoring program.The purpose of this article is to introduce our ESD tutoring experience,review the published papers related to this topic,and propose several suggestions for future directions in teaching and learning ESD.展开更多
Purpose:This study aimed to explore whether the attitudes of nursing students toward the use of mobile learning are positive or negative and to identify the factors influencing their attitudes by reviewing the literat...Purpose:This study aimed to explore whether the attitudes of nursing students toward the use of mobile learning are positive or negative and to identify the factors influencing their attitudes by reviewing the literature.Methods:Electronic search of six databases,including PubMed,the Cumulative Index of Nursing and Allied Health Literature,ProQuest,Web of Science,EMBASE,and Cochrane Library,was conducted,and relevant references within articles were manually searched.Retrieval time was from inception to October 21,2020.The literature review was conducted in accordance with the PRISMA guidelines and the integrative review method.The Mixed Method Appraisal Tool(MMAT)was used for quality assessment.Results:A total of 316 articles were identified,and 18 English-language studies were finally included by reviewing titles,abstracts,and full text.Six quantitative,five qualitative,and seven mixed-method articles related to nursing students’attitudes toward the use of mobile learning were identified.The results showed that most nursing students had positive attitudes toward mobile learning.Although students expressed strong intentions for mobile learning,the actual usage rate in practical settings was low.Several advantageous factors included usefulness,convenience,and ease of use,whereas disadvantageous factors included hardware facility,updated content,and software stability.Conclusion:Most nursing students have positive attitudes and willingness to mobile learning,but the actual use rate remains low.Advantageous and disadvantageous factors coexist.Further studies are needed to assess how mobile learning improves nursing students’clinical knowledge and improves patient care.展开更多
The presentation of the findings of this article is based on an action research focused on the supportive role of the school in adolescents' lives, whereby Religious Education's contribution to the social and emotio...The presentation of the findings of this article is based on an action research focused on the supportive role of the school in adolescents' lives, whereby Religious Education's contribution to the social and emotional development of adolescents (11-15) is combined with the evaluation of the potential offered by a constructivist approach to the learning process. The research commenced in 2012 and is now in its third "year. The project is based on an intervention at a high school in an impoverished suburb of Athens and researches educational practices through interpretative-ethnographic methods. The researcher has attempted to answer the question of whether the design of the learning environments is effective not only in the learning process, but also on inter-communication and "connectedness" between the members of the learning community. The findings so far indicate a correlation between adolescents' emotional and social wellbeing and the school's approach to knowledge and learning methods, specifically in Religious Education classes. It is fair to say, however, that there exist ethnic, social and family components that are negatively related to a sense of"connectedness" within the school although at the same time Religious Education as a subject is, however, found to be positively related to learning community atmosphere.展开更多
This presentation discusses the requests of modern pedagogy, and a possible bridging between the traditional teaching strategies drawn by the Ratio Studiorum of a unique and rare structure, and today's learning proce...This presentation discusses the requests of modern pedagogy, and a possible bridging between the traditional teaching strategies drawn by the Ratio Studiorum of a unique and rare structure, and today's learning process. It will argue the practical application and philosophy of education widely accepted and recognized as a part of curricular activities within the learning environments, though with no recognition of its origin. This paper aims to examine the indisputable contributions of the educational methods of the Jesuits in our time, although, the discipline has developed new fundamental, and new concepts such as self-esteem, self-awareness, and self-determination among others,展开更多
Aim To find a more efficient learning method based on temporal difference learning for delayed reinforcement learning tasks. Methods A kind of Q learning algorithm based on truncated TD( λ ) with adaptive scheme...Aim To find a more efficient learning method based on temporal difference learning for delayed reinforcement learning tasks. Methods A kind of Q learning algorithm based on truncated TD( λ ) with adaptive schemes of λ value selection addressed to absorbing Markov decision processes was presented and implemented on computers. Results and Conclusion Simulations on the shortest path searching problems show that using adaptive λ in the Q learning based on TTD( λ ) can speed up its convergence.展开更多
The purpose of the paper is to demonstrate the effectiveness of using project method in teaching professional English in non-linguistic colleges. The main principles of project teaching, the technology of its adoption...The purpose of the paper is to demonstrate the effectiveness of using project method in teaching professional English in non-linguistic colleges. The main principles of project teaching, the technology of its adoption in teaching process, and some kinds of projects used in studying are reviewed. During the research the following methods were used: theoretical analysis, empirical, and statistical. While studying the course "Professional foreign language", the monitoring of effectiveness of project method use in teaching a foreign language was made. Monitoring was conducted under the following criteria: percent of progress, percent of quality of knowledge, and the level of motivation in studying English. The experience showed that in the process of project work learners' general educational abilities, special abilities, and communication abilities are developed.展开更多
Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This st...Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This study took the Wudong coal mine in Xinjiang province of China as a typical case. The gas occurrence of the coal seam and the pressure-relief range of the surrounding rock(coal) were studied by experiments and numerical simulations. Then, a new method to calculate the gas emission quantity for this special geological condition was provided. Based on the calculated quantity, a further gas drainage plan, as well as the evaluation of it with field drainage data, was finally given. The results are important for engineers to reasonably plan the gas drainage boreholes of steeply inclined and extremely thick coal seams.展开更多
Optimization under uncertainty is a challenging topic of practical importance in the Process Systems Engineering.Since the solution of an optimization problem generally exhibits high sensitivity to the parameter varia...Optimization under uncertainty is a challenging topic of practical importance in the Process Systems Engineering.Since the solution of an optimization problem generally exhibits high sensitivity to the parameter variations, the deterministic model which neglects the parametric uncertainties is not suitable for practical applications. This paper provides an overview of the key contributions and recent advances in the field of process optimization under uncertainty over the past ten years and discusses their advantages and limitations thoroughly. The discussion is focused on three specific research areas, namely robust optimization, stochastic programming and chance constrained programming, based on which a systematic analysis of their applications, developments and future directions are presented. It shows that the more recent trend has been to integrate different optimization methods to leverage their respective superiority and compensate for their drawbacks. Moreover, data-driven optimization, which combines mathematical programming methods and machine learning algorithms, has become an emerging and competitive tool to handle optimization problems in the presence of uncertainty based on massive historical data.展开更多
The rise of big data has led to new demands for machine learning (ML) systems to learn complex mod- els, with millions to billions of parameters, that promise adequate capacity to digest massive datasets and offer p...The rise of big data has led to new demands for machine learning (ML) systems to learn complex mod- els, with millions to billions of parameters, that promise adequate capacity to digest massive datasets and offer powerful predictive analytics (such as high-dimensional latent features, intermediate repre- sentations, and decision functions) thereupon. In order to run ML algorithms at such scales, on a distrib- uted cluster with tens to thousands of machines, it is often the case that significant engineering efforts are required-and one might fairly ask whether such engineering truly falls within the domain of ML research. Taking the view that "big" ML systems can benefit greatly from ML-rooted statistical and algo- rithmic insights-and that ML researchers should therefore not shy away from such systems design-we discuss a series of principles and strategies distilled from our recent efforts on industrial-scale ML solu- tions. These principles and strategies span a continuum from application, to engineering, and to theo- retical research and development of big ML systems and architectures, with the goal of understanding how to make them efficient, generally applicable, and supported with convergence and scaling guaran- tees. They concern four key questions that traditionally receive little attention in ML research: How can an ML program be distributed over a cluster? How can ML computation be bridged with inter-machine communication? How can such communication be performed? What should be communicated between machines? By exposing underlying statistical and algorithmic characteristics unique to ML programs but not typically seen in traditional computer programs, and by dissecting successful cases to reveal how we have harnessed these principles to design and develop both high-performance distributed ML software as well as general-purpose ML frameworks, we present opportunities for ML researchers and practitioners to further shape and enlarge the area that lies between ML and systems..展开更多
A novel model named Multi-scale Gaussian Processes (MGP) is proposed. Motivated by the ideas of multi-scale representations in the wavelet theory, in the new model, a Gaussian process is represented at a scale by a li...A novel model named Multi-scale Gaussian Processes (MGP) is proposed. Motivated by the ideas of multi-scale representations in the wavelet theory, in the new model, a Gaussian process is represented at a scale by a linear basis that is composed of a scale function and its different translations. Finally the distribution of the targets of the given samples can be obtained at different scales. Compared with the standard Gaussian Processes (GP) model, the MGP model can control its complexity conveniently just by adjusting the scale pa-rameter. So it can trade-off the generalization ability and the empirical risk rapidly. Experiments verify the fea-sibility of the MGP model, and exhibit that its performance is superior to the GP model if appropriate scales are chosen.展开更多
"Using technology to support learning" gradually becomes the main trend of technology application and technology-curriculum integration at home and abroad. The empirical research based on newly-established universit..."Using technology to support learning" gradually becomes the main trend of technology application and technology-curriculum integration at home and abroad. The empirical research based on newly-established universities shows that college students' usage intention on network course and study behavior is not real. Study behavior of network course is passive and outside stimulation. They are more concerned about the usefulness and relative advantages of the learning mode in the network course learning; however, learning environment of the network course at present still is given on material and tool level. The institutions should, in compliance with the trend of higher education development in the world, actively build learning environment to meet the learning needs of students in the information age, deepen the reform of information technology application and curriculum based on the learner-centered concept, focus on the training of initiative learning of college students, put community impact into full play to promote the integration of the superiority of the material platform and initiative, and finally improve the efficiency and quality of teaching and education.展开更多
Hard Ball by Chris Matthews is a great book offering fascinating anecdotes of various people seeking political power: their ambitions, the brutality of politics and their skillful maneuverings of political schemes. T...Hard Ball by Chris Matthews is a great book offering fascinating anecdotes of various people seeking political power: their ambitions, the brutality of politics and their skillful maneuverings of political schemes. This essay utilizes a hypothetical scenario, how to get ele,:ted to local school boards, to illustrate how politics is played at the local level. I chose this scenario is because all politics are local and school board can influence schools, teachers and students on a daily basis.展开更多
This study explored the distribution of three types of English formulaic language, which involves four categories in L1 Chinese L2 English learners’ speaking performance. In addition, it investigated the relationship...This study explored the distribution of three types of English formulaic language, which involves four categories in L1 Chinese L2 English learners’ speaking performance. In addition, it investigated the relationship between the English learners’ use of formulaic language and their spoken English fluency. A CCA(canonical correlation analysis) was conducted to examine the correlations between two sets of fluency variables(dependent variables) and linguistic variables of English formulaic language use(independent variables). The fluency variable set consists of:(1)temporal indices such as SR(speech rate), AR(articulation rate), MLR(mean length of run), and PTR(phonation time ratio);(2) linguistic variables of English formulaic language like F2 R(twoword formulaic sequences/run ratio, B3 R(three-word lexical bundles/run ratio), and B4 R(fourword lexical bundles/run ratio). These are calculated according to the frequency of the English formulaic language in the speech samples of the participants(n = 86) across three academic levels.The results indicate that the learners’ spoken English fluency is highly related to their use of English formulaic language. Its limitations and future research directions are also discussed.展开更多
The teaching-learning process may have several obstacles; one of those would be a cultural situation of students. When the author refers to cultural situation, the author means the language or dialect that they speak....The teaching-learning process may have several obstacles; one of those would be a cultural situation of students. When the author refers to cultural situation, the author means the language or dialect that they speak. In the state of Puebla, Mexico, there are primary schools where the courses are taught to students who do not speak Spanish and they only speak their own dialect. On the other hand, the use of information and communication technologies in primary schools in Puebla is a fact but a main concern in schools is that the languages in which they are operated are Spanish. To analyze this situation, the author finds that turns out to be very important and with a negative effect on both the implementation and acceptance of a multimedia program in these schools, generating a technological gap between students. The government efforts are decimated because of this cultural divide prevalent in many communities in the state of Puebla and the increase of this situation when considering the illiterate population.展开更多
Teachers can motivate their pupils by fostering autonomous learning or---especially if they feel under pressure themselves--teachers can hamper the motivation of their students by being controlling. The purpose of thi...Teachers can motivate their pupils by fostering autonomous learning or---especially if they feel under pressure themselves--teachers can hamper the motivation of their students by being controlling. The purpose of this study with 488 secondary school teachers from Austria was to examine the satisfaction of teachers' needs for autonomy, competence and relatedness and meaningful relations to perceived job-related pressure and self-efficacy, to gain an increased insight in autonomy supportive contexts. The results point out that there are various sources for pressure in the teaching profession and structural equation modeling revealing a reciprocal relation between the satisfaction of the need for autonomy and pressure in teaching, as well as between the satisfaction of the need for competence and self-efficacy. In addition perceived pressure had a negative impact on teachers' self-efficacy and self-efficacy in turn influenced the satisfaction of the need for autonomy. In summary, considering basic psychological needs satisfaction of teachers seems relevant to create autonomy supportive environments for pupils and teachers in schools.展开更多
文摘This paper intends to promote a college English autonomous teaching and learning approach by introducing the whole process of its implementation and feedback from the learners. The theoretical and practical framework of this approach is: with multiple autonomous learning research and practice models as its core, with process syllabus as its guidance, with task-based teaching as its essential principle, with group cooperation and reciprocal learning as its means, with extracurricular activities, online learning and self-access center as its learning environment, with formative assessment system as its guarantee and with cultivation of learners' comprehensive English practical skills and autonomy as its goal. Through this approach, we provide the learners with a favorable learning environment where they can learn by themselves and learn by reflection and practice so that they can learn how to learn and how to behave and how to survive.
文摘Aim To investigate the model free multi step average reward reinforcement learning algorithm. Methods By combining the R learning algorithms with the temporal difference learning (TD( λ ) learning) algorithms for average reward problems, a novel incremental algorithm, called R( λ ) learning, was proposed. Results and Conclusion The proposed algorithm is a natural extension of the Q( λ) learning, the multi step discounted reward reinforcement learning algorithm, to the average reward cases. Simulation results show that the R( λ ) learning with intermediate λ values makes significant performance improvement over the simple R learning.
文摘The new curriculum standard points out that affection is one of the most important goals of fundamental education. The non-target language environment is easier to cause the affective change of middle school students who are changeable in their affective state. Based on the affective filter hypothesis, this paper deals with the adjustment to affective factors in English learning by using Internet English Curriculum Resource, such as attitude and motivation, anxiety and inhibition, self-esteem and self-confidence. At last, some suggestions are offered to judge Internet English Curriculum Resource.
文摘This paper presents the differences and relations between background knowledge and domain theories in learning systems. The roles they play during learning procedures are discussed. It is emphasized that background knowledge plays an important role in enhancing the ability of a learning system. An explanation based learning system with domain theory in primary knowledge base and background knowledge in secondary knowledge base is introduced as an example. It shows how background knowledge can be used to solve some of the problems caused by incomplete domain theory in an explanation based learning system. The system can accomplish knowledge level learning through purely deductive approach. At last the acquisition of background knowledge is briefly discussed.
文摘Endoscopic submucosal dissection(ESD) is becoming a popular procedure for the diagnosis and treatment of superficial mucosal lesions,and has the advantage of en bloc resection which yields a higher complete resection and remission rate compared to endoscopic mucosal resection(EMR).However,the learning process of this advanced endoscopic procedure requires a lengthy training period and considerable experience to be proficient.A well framed training protocol which is safe,effective,easily reproducible and cost-effective is desirable to teach ESD.In addition,the training course may need to be tailored around settings such as ethnicity,culture,workload,and disease incidence.In Asian countries with a large volume of early gastric lesions which need endoscopic treatment,endoscopists would be able to learn ESD expanding their skills from EMR to ESD under the supervision of experts.Whereas,in Western countries due to the low incidence of superficial gastric tumors,trials have utilized simulator models to improve learning.In Korea,the Korean Society of Gastrointestinal Endoscopy(KSGE) is playing an important role in training many gastroenterologists who have shown an interest in performing ESD by providing an annual live demonstration and a nationwide tutoring program.The purpose of this article is to introduce our ESD tutoring experience,review the published papers related to this topic,and propose several suggestions for future directions in teaching and learning ESD.
文摘Purpose:This study aimed to explore whether the attitudes of nursing students toward the use of mobile learning are positive or negative and to identify the factors influencing their attitudes by reviewing the literature.Methods:Electronic search of six databases,including PubMed,the Cumulative Index of Nursing and Allied Health Literature,ProQuest,Web of Science,EMBASE,and Cochrane Library,was conducted,and relevant references within articles were manually searched.Retrieval time was from inception to October 21,2020.The literature review was conducted in accordance with the PRISMA guidelines and the integrative review method.The Mixed Method Appraisal Tool(MMAT)was used for quality assessment.Results:A total of 316 articles were identified,and 18 English-language studies were finally included by reviewing titles,abstracts,and full text.Six quantitative,five qualitative,and seven mixed-method articles related to nursing students’attitudes toward the use of mobile learning were identified.The results showed that most nursing students had positive attitudes toward mobile learning.Although students expressed strong intentions for mobile learning,the actual usage rate in practical settings was low.Several advantageous factors included usefulness,convenience,and ease of use,whereas disadvantageous factors included hardware facility,updated content,and software stability.Conclusion:Most nursing students have positive attitudes and willingness to mobile learning,but the actual use rate remains low.Advantageous and disadvantageous factors coexist.Further studies are needed to assess how mobile learning improves nursing students’clinical knowledge and improves patient care.
文摘The presentation of the findings of this article is based on an action research focused on the supportive role of the school in adolescents' lives, whereby Religious Education's contribution to the social and emotional development of adolescents (11-15) is combined with the evaluation of the potential offered by a constructivist approach to the learning process. The research commenced in 2012 and is now in its third "year. The project is based on an intervention at a high school in an impoverished suburb of Athens and researches educational practices through interpretative-ethnographic methods. The researcher has attempted to answer the question of whether the design of the learning environments is effective not only in the learning process, but also on inter-communication and "connectedness" between the members of the learning community. The findings so far indicate a correlation between adolescents' emotional and social wellbeing and the school's approach to knowledge and learning methods, specifically in Religious Education classes. It is fair to say, however, that there exist ethnic, social and family components that are negatively related to a sense of"connectedness" within the school although at the same time Religious Education as a subject is, however, found to be positively related to learning community atmosphere.
文摘This presentation discusses the requests of modern pedagogy, and a possible bridging between the traditional teaching strategies drawn by the Ratio Studiorum of a unique and rare structure, and today's learning process. It will argue the practical application and philosophy of education widely accepted and recognized as a part of curricular activities within the learning environments, though with no recognition of its origin. This paper aims to examine the indisputable contributions of the educational methods of the Jesuits in our time, although, the discipline has developed new fundamental, and new concepts such as self-esteem, self-awareness, and self-determination among others,
文摘Aim To find a more efficient learning method based on temporal difference learning for delayed reinforcement learning tasks. Methods A kind of Q learning algorithm based on truncated TD( λ ) with adaptive schemes of λ value selection addressed to absorbing Markov decision processes was presented and implemented on computers. Results and Conclusion Simulations on the shortest path searching problems show that using adaptive λ in the Q learning based on TTD( λ ) can speed up its convergence.
文摘The purpose of the paper is to demonstrate the effectiveness of using project method in teaching professional English in non-linguistic colleges. The main principles of project teaching, the technology of its adoption in teaching process, and some kinds of projects used in studying are reviewed. During the research the following methods were used: theoretical analysis, empirical, and statistical. While studying the course "Professional foreign language", the monitoring of effectiveness of project method use in teaching a foreign language was made. Monitoring was conducted under the following criteria: percent of progress, percent of quality of knowledge, and the level of motivation in studying English. The experience showed that in the process of project work learners' general educational abilities, special abilities, and communication abilities are developed.
基金provided by the National Science and Technology Major Project (No. 2016ZX05043-005)
文摘Gas emissions of workfaces in steeply inclined and extremely thick coal seams differ from those under normal geological conditions, which usually feature a high gas concentration and a large emission quantity. This study took the Wudong coal mine in Xinjiang province of China as a typical case. The gas occurrence of the coal seam and the pressure-relief range of the surrounding rock(coal) were studied by experiments and numerical simulations. Then, a new method to calculate the gas emission quantity for this special geological condition was provided. Based on the calculated quantity, a further gas drainage plan, as well as the evaluation of it with field drainage data, was finally given. The results are important for engineers to reasonably plan the gas drainage boreholes of steeply inclined and extremely thick coal seams.
文摘Optimization under uncertainty is a challenging topic of practical importance in the Process Systems Engineering.Since the solution of an optimization problem generally exhibits high sensitivity to the parameter variations, the deterministic model which neglects the parametric uncertainties is not suitable for practical applications. This paper provides an overview of the key contributions and recent advances in the field of process optimization under uncertainty over the past ten years and discusses their advantages and limitations thoroughly. The discussion is focused on three specific research areas, namely robust optimization, stochastic programming and chance constrained programming, based on which a systematic analysis of their applications, developments and future directions are presented. It shows that the more recent trend has been to integrate different optimization methods to leverage their respective superiority and compensate for their drawbacks. Moreover, data-driven optimization, which combines mathematical programming methods and machine learning algorithms, has become an emerging and competitive tool to handle optimization problems in the presence of uncertainty based on massive historical data.
文摘The rise of big data has led to new demands for machine learning (ML) systems to learn complex mod- els, with millions to billions of parameters, that promise adequate capacity to digest massive datasets and offer powerful predictive analytics (such as high-dimensional latent features, intermediate repre- sentations, and decision functions) thereupon. In order to run ML algorithms at such scales, on a distrib- uted cluster with tens to thousands of machines, it is often the case that significant engineering efforts are required-and one might fairly ask whether such engineering truly falls within the domain of ML research. Taking the view that "big" ML systems can benefit greatly from ML-rooted statistical and algo- rithmic insights-and that ML researchers should therefore not shy away from such systems design-we discuss a series of principles and strategies distilled from our recent efforts on industrial-scale ML solu- tions. These principles and strategies span a continuum from application, to engineering, and to theo- retical research and development of big ML systems and architectures, with the goal of understanding how to make them efficient, generally applicable, and supported with convergence and scaling guaran- tees. They concern four key questions that traditionally receive little attention in ML research: How can an ML program be distributed over a cluster? How can ML computation be bridged with inter-machine communication? How can such communication be performed? What should be communicated between machines? By exposing underlying statistical and algorithmic characteristics unique to ML programs but not typically seen in traditional computer programs, and by dissecting successful cases to reveal how we have harnessed these principles to design and develop both high-performance distributed ML software as well as general-purpose ML frameworks, we present opportunities for ML researchers and practitioners to further shape and enlarge the area that lies between ML and systems..
文摘A novel model named Multi-scale Gaussian Processes (MGP) is proposed. Motivated by the ideas of multi-scale representations in the wavelet theory, in the new model, a Gaussian process is represented at a scale by a linear basis that is composed of a scale function and its different translations. Finally the distribution of the targets of the given samples can be obtained at different scales. Compared with the standard Gaussian Processes (GP) model, the MGP model can control its complexity conveniently just by adjusting the scale pa-rameter. So it can trade-off the generalization ability and the empirical risk rapidly. Experiments verify the fea-sibility of the MGP model, and exhibit that its performance is superior to the GP model if appropriate scales are chosen.
文摘"Using technology to support learning" gradually becomes the main trend of technology application and technology-curriculum integration at home and abroad. The empirical research based on newly-established universities shows that college students' usage intention on network course and study behavior is not real. Study behavior of network course is passive and outside stimulation. They are more concerned about the usefulness and relative advantages of the learning mode in the network course learning; however, learning environment of the network course at present still is given on material and tool level. The institutions should, in compliance with the trend of higher education development in the world, actively build learning environment to meet the learning needs of students in the information age, deepen the reform of information technology application and curriculum based on the learner-centered concept, focus on the training of initiative learning of college students, put community impact into full play to promote the integration of the superiority of the material platform and initiative, and finally improve the efficiency and quality of teaching and education.
文摘Hard Ball by Chris Matthews is a great book offering fascinating anecdotes of various people seeking political power: their ambitions, the brutality of politics and their skillful maneuverings of political schemes. This essay utilizes a hypothetical scenario, how to get ele,:ted to local school boards, to illustrate how politics is played at the local level. I chose this scenario is because all politics are local and school board can influence schools, teachers and students on a daily basis.
文摘This study explored the distribution of three types of English formulaic language, which involves four categories in L1 Chinese L2 English learners’ speaking performance. In addition, it investigated the relationship between the English learners’ use of formulaic language and their spoken English fluency. A CCA(canonical correlation analysis) was conducted to examine the correlations between two sets of fluency variables(dependent variables) and linguistic variables of English formulaic language use(independent variables). The fluency variable set consists of:(1)temporal indices such as SR(speech rate), AR(articulation rate), MLR(mean length of run), and PTR(phonation time ratio);(2) linguistic variables of English formulaic language like F2 R(twoword formulaic sequences/run ratio, B3 R(three-word lexical bundles/run ratio), and B4 R(fourword lexical bundles/run ratio). These are calculated according to the frequency of the English formulaic language in the speech samples of the participants(n = 86) across three academic levels.The results indicate that the learners’ spoken English fluency is highly related to their use of English formulaic language. Its limitations and future research directions are also discussed.
文摘The teaching-learning process may have several obstacles; one of those would be a cultural situation of students. When the author refers to cultural situation, the author means the language or dialect that they speak. In the state of Puebla, Mexico, there are primary schools where the courses are taught to students who do not speak Spanish and they only speak their own dialect. On the other hand, the use of information and communication technologies in primary schools in Puebla is a fact but a main concern in schools is that the languages in which they are operated are Spanish. To analyze this situation, the author finds that turns out to be very important and with a negative effect on both the implementation and acceptance of a multimedia program in these schools, generating a technological gap between students. The government efforts are decimated because of this cultural divide prevalent in many communities in the state of Puebla and the increase of this situation when considering the illiterate population.
文摘Teachers can motivate their pupils by fostering autonomous learning or---especially if they feel under pressure themselves--teachers can hamper the motivation of their students by being controlling. The purpose of this study with 488 secondary school teachers from Austria was to examine the satisfaction of teachers' needs for autonomy, competence and relatedness and meaningful relations to perceived job-related pressure and self-efficacy, to gain an increased insight in autonomy supportive contexts. The results point out that there are various sources for pressure in the teaching profession and structural equation modeling revealing a reciprocal relation between the satisfaction of the need for autonomy and pressure in teaching, as well as between the satisfaction of the need for competence and self-efficacy. In addition perceived pressure had a negative impact on teachers' self-efficacy and self-efficacy in turn influenced the satisfaction of the need for autonomy. In summary, considering basic psychological needs satisfaction of teachers seems relevant to create autonomy supportive environments for pupils and teachers in schools.