This book is greatly appreciated for its collection of various innovative activities which could be applied in different levels of technology-savvy classrooms.It is regarded as guidance to show paths for language educ...This book is greatly appreciated for its collection of various innovative activities which could be applied in different levels of technology-savvy classrooms.It is regarded as guidance to show paths for language educators to teach in digital age,although most of the teachers today are digital immigrants who "have become fascinated by and adopted many,or most aspects of the new technology are,and always will be compared to them"(Prensky,2001).They have to attempt to equip themselves with the knowledge of new media,which aims to provide the current students with their needs to become fully literate in this digital age.However,when the Internet began to arrive in schools,it was embraced by educators already seasoned in the challenges of change.展开更多
Chapter 1 History and foundation by Alagan Anpalagan. This book chapter deals with history and foundation of cognitive radio. In recent years wireless communications have experienced an unprecedented success for the r...Chapter 1 History and foundation by Alagan Anpalagan. This book chapter deals with history and foundation of cognitive radio. In recent years wireless communications have experienced an unprecedented success for the rapidity of their diffusion and for their impact in the life of human society. The technologies used in wireless communications are far from being mature and many changes induced by their progress are still to come. Cognitive radio is one of these technologies and is regarded as a key technology to increase efficiency in wireless communications. In many circumstances the spectrum assigned to wireless communications is not fully used. The main goal of cognitive radio is to improve the exploitation of the spectrum. The idea is to let the unlicensed users to access the spectrum left unused by the licensed users. In this chapter the main steps of the brief history of cognitive radio are presented including issues related to policy regulations that have influenced the technology and alternative technical solutions as software defined radio. The chapter ends with a brief discussion of future applications in wireless communications and of the challenges that they pose to cognitive radio. This is a well written and informative chapter that deals with an important technology. I suggest to read it. Chapter 6 MIMO systems and cooperative networks performances by Kosai Raoof, Maha Ben Zid. This chapter deals with MIMO (Multiple Input Multiple Output) systems. This is a technology used to in wireless communications to improve transmission robustness and to increase spectral efficiency. The relation between MIMO systems and wireless sensor networks is investigated. Spatially distributed wireless sensor networks are deployed for many different purposes, let us mention, for example, environment monitoring missions or surveillance missions. Cooperative networks with virtual MIMO channels are studied, in particular networks aware of their environment are considered. These are cognitive networks that operate in wireless form. This last feature is the bridge that links them to cognitive radio. In fact the cognitive radio technology is used to allocate spectrum to the users of the cognitive network in an adaptive way. This book chapter deals with a specific application, however, this is a very important application and this work is written in a way that makes it readable by a wide audience technically oriented readers. I suggest to read it.展开更多
5G is the hottest topic in telecommunication area in recent years.ITU has defined 5G as IMT-2020,and presented the scenarios of IMT-2020.These scenarios for IMT-2020 can be concluded as follows：-Enhanced Mobile Broad...5G is the hottest topic in telecommunication area in recent years.ITU has defined 5G as IMT-2020,and presented the scenarios of IMT-2020.These scenarios for IMT-2020 can be concluded as follows：-Enhanced Mobile Broadband：Mobile Broadband addresses the human-centric use cases for access to multi-media content,services and data.The demand for mobile展开更多
Altmetrics自提出以来发展迅速,极大地拓宽了文献计量学评价学术成果的研究范围。目前绝大多数的Altmetrics研究集中在对论文学术成果的评价上,学术专著或其他类型学术成果的评价似乎不够受重视。然而,专著是社会科学和人文学科学术成...Altmetrics自提出以来发展迅速,极大地拓宽了文献计量学评价学术成果的研究范围。目前绝大多数的Altmetrics研究集中在对论文学术成果的评价上,学术专著或其他类型学术成果的评价似乎不够受重视。然而,专著是社会科学和人文学科学术成果的重要形式,本研究将着重研究专著学术成果的评价。本文通过对出版时间标准化构建学术专著在数据库中的日均被引次数(daily average times cited,DATC)指标。此外,本文使用递归神经网络(recurrent neural network,RNN)的方法对专著的在线评论进行情感分类,并使用情感词典对评论文本进行细粒度情感分析,得到情感分析值指标。研究结果发现,部分学术图书在BkCI数据库中的被引次数较少,但其DATC指标较高,原因是这些学术专著的出版时间较晚,还没有足够的时间积累引文。这说明专著的被引次数少并不意味着它们的学术影响力一定低,仅利用引文索引数据库中的被引次数来评价学术专著的学术影响力是有缺陷的。另一个结果表明,学术专著在在线评论方面的Altmetric指标与引文相关性很小,特别是在情感分析均值指标和引文指标之间。低相关性意味着在线评论方面的Altmetric指标在评价学术专著学术影响力方面几乎没有可行性,只能用于评价学术专著的社会影响力。展开更多
文摘This book is greatly appreciated for its collection of various innovative activities which could be applied in different levels of technology-savvy classrooms.It is regarded as guidance to show paths for language educators to teach in digital age,although most of the teachers today are digital immigrants who "have become fascinated by and adopted many,or most aspects of the new technology are,and always will be compared to them"(Prensky,2001).They have to attempt to equip themselves with the knowledge of new media,which aims to provide the current students with their needs to become fully literate in this digital age.However,when the Internet began to arrive in schools,it was embraced by educators already seasoned in the challenges of change.
文摘Chapter 1 History and foundation by Alagan Anpalagan. This book chapter deals with history and foundation of cognitive radio. In recent years wireless communications have experienced an unprecedented success for the rapidity of their diffusion and for their impact in the life of human society. The technologies used in wireless communications are far from being mature and many changes induced by their progress are still to come. Cognitive radio is one of these technologies and is regarded as a key technology to increase efficiency in wireless communications. In many circumstances the spectrum assigned to wireless communications is not fully used. The main goal of cognitive radio is to improve the exploitation of the spectrum. The idea is to let the unlicensed users to access the spectrum left unused by the licensed users. In this chapter the main steps of the brief history of cognitive radio are presented including issues related to policy regulations that have influenced the technology and alternative technical solutions as software defined radio. The chapter ends with a brief discussion of future applications in wireless communications and of the challenges that they pose to cognitive radio. This is a well written and informative chapter that deals with an important technology. I suggest to read it. Chapter 6 MIMO systems and cooperative networks performances by Kosai Raoof, Maha Ben Zid. This chapter deals with MIMO (Multiple Input Multiple Output) systems. This is a technology used to in wireless communications to improve transmission robustness and to increase spectral efficiency. The relation between MIMO systems and wireless sensor networks is investigated. Spatially distributed wireless sensor networks are deployed for many different purposes, let us mention, for example, environment monitoring missions or surveillance missions. Cooperative networks with virtual MIMO channels are studied, in particular networks aware of their environment are considered. These are cognitive networks that operate in wireless form. This last feature is the bridge that links them to cognitive radio. In fact the cognitive radio technology is used to allocate spectrum to the users of the cognitive network in an adaptive way. This book chapter deals with a specific application, however, this is a very important application and this work is written in a way that makes it readable by a wide audience technically oriented readers. I suggest to read it.
文摘5G is the hottest topic in telecommunication area in recent years.ITU has defined 5G as IMT-2020,and presented the scenarios of IMT-2020.These scenarios for IMT-2020 can be concluded as follows：-Enhanced Mobile Broadband：Mobile Broadband addresses the human-centric use cases for access to multi-media content,services and data.The demand for mobile
文摘Altmetrics自提出以来发展迅速,极大地拓宽了文献计量学评价学术成果的研究范围。目前绝大多数的Altmetrics研究集中在对论文学术成果的评价上,学术专著或其他类型学术成果的评价似乎不够受重视。然而,专著是社会科学和人文学科学术成果的重要形式,本研究将着重研究专著学术成果的评价。本文通过对出版时间标准化构建学术专著在数据库中的日均被引次数(daily average times cited,DATC)指标。此外,本文使用递归神经网络(recurrent neural network,RNN)的方法对专著的在线评论进行情感分类,并使用情感词典对评论文本进行细粒度情感分析,得到情感分析值指标。研究结果发现,部分学术图书在BkCI数据库中的被引次数较少,但其DATC指标较高,原因是这些学术专著的出版时间较晚,还没有足够的时间积累引文。这说明专著的被引次数少并不意味着它们的学术影响力一定低,仅利用引文索引数据库中的被引次数来评价学术专著的学术影响力是有缺陷的。另一个结果表明,学术专著在在线评论方面的Altmetric指标与引文相关性很小,特别是在情感分析均值指标和引文指标之间。低相关性意味着在线评论方面的Altmetric指标在评价学术专著学术影响力方面几乎没有可行性,只能用于评价学术专著的社会影响力。
