the routing protocol for low-power and lossy networks(RPL) has been used in advanced metering infrastructure(AMI)which could provide two-way communication between smart meters and city utilities.To improve the network...the routing protocol for low-power and lossy networks(RPL) has been used in advanced metering infrastructure(AMI)which could provide two-way communication between smart meters and city utilities.To improve the network performance of AMI networks, this paper proposed an improved algorithm of RPL based on triangle module operator(IAR-TMO). IAR-TMO proposes membership functions of the following five typical routing metrics: end-to-end delay, number of hops, expected transmission count(ETX),node remaining energy, and child node count.Moreover, IAR-TMO uses triangle module operator to fuse membership functions of these routing metrics. Then, IAR-TMO selects preferred parents(the next hop) based on the triangle module operator. Theoretical analysis and simulation results show that IAR-TMO has a great improvement when compared with two recent representative algorithms: ETXOF(ETX Objective Function) and OF-FL(Objective Function based on Fuzzy Logic), in terms of network lifetime, average end-to-end delay,etc. Consequently, the network performances of AMI networks can be improved effectively.展开更多
Learning challenges are more common in the 21 st century than many people believe; however, there are more efficient and better methods to develop academic learning skills for students. Identifying learning problems c...Learning challenges are more common in the 21 st century than many people believe; however, there are more efficient and better methods to develop academic learning skills for students. Identifying learning problems can help both students and lecturers to apply specific learning techniques and work together to be more productive in the process of teaching and learning. This study investigates the collaboration of science foundation lecturers in addressing the students＇ academic performance and challenges in their foundation modules at the University of Venda. The study is also aimed at finding out whether students can be able to apply their information technology （IT） skills in other modules and they make use of group work in projects into different foundation modules to enhance performance and develop academic learning skills. In this study, students were given projects in their respective modules （Foundation Biology and Foundation IT） and it was required to them to make use of their IT skills during the research report and also during the presentation of their project. These projects were done in groups wherein students undertook some mini researches. Their findings were then reported in writing and presentations were held. The Foundation English lecturer helped in assessing the use of the academic language used in writing and during oral presentations. The findings from these projects were that students＇ academic performance and skills improved and their specific knowledge in those modules also improved radically. It was found that group work plays a very imperative role in enhancing the students＇ performance and collaboration in various foundation modules.展开更多
Maximum likelihood(ML) noncoherent block detection techniques are investigated for block-coded MPSK modulation in cooperative decode-and-forward relay systems over slow fading channels.A decision-directed iterative Vi...Maximum likelihood(ML) noncoherent block detection techniques are investigated for block-coded MPSK modulation in cooperative decode-and-forward relay systems over slow fading channels.A decision-directed iterative Viterbi algorithm(IVA) is derived for a suboptimal ML noncoherent detection.Simulation results show that the IVA can approach the error performances of the exhaustive detection method but at a lower complexity.展开更多
基金supported by the Beijing Laboratory of Advanced Information Networks
文摘the routing protocol for low-power and lossy networks(RPL) has been used in advanced metering infrastructure(AMI)which could provide two-way communication between smart meters and city utilities.To improve the network performance of AMI networks, this paper proposed an improved algorithm of RPL based on triangle module operator(IAR-TMO). IAR-TMO proposes membership functions of the following five typical routing metrics: end-to-end delay, number of hops, expected transmission count(ETX),node remaining energy, and child node count.Moreover, IAR-TMO uses triangle module operator to fuse membership functions of these routing metrics. Then, IAR-TMO selects preferred parents(the next hop) based on the triangle module operator. Theoretical analysis and simulation results show that IAR-TMO has a great improvement when compared with two recent representative algorithms: ETXOF(ETX Objective Function) and OF-FL(Objective Function based on Fuzzy Logic), in terms of network lifetime, average end-to-end delay,etc. Consequently, the network performances of AMI networks can be improved effectively.
文摘Learning challenges are more common in the 21 st century than many people believe; however, there are more efficient and better methods to develop academic learning skills for students. Identifying learning problems can help both students and lecturers to apply specific learning techniques and work together to be more productive in the process of teaching and learning. This study investigates the collaboration of science foundation lecturers in addressing the students＇ academic performance and challenges in their foundation modules at the University of Venda. The study is also aimed at finding out whether students can be able to apply their information technology （IT） skills in other modules and they make use of group work in projects into different foundation modules to enhance performance and develop academic learning skills. In this study, students were given projects in their respective modules （Foundation Biology and Foundation IT） and it was required to them to make use of their IT skills during the research report and also during the presentation of their project. These projects were done in groups wherein students undertook some mini researches. Their findings were then reported in writing and presentations were held. The Foundation English lecturer helped in assessing the use of the academic language used in writing and during oral presentations. The findings from these projects were that students＇ academic performance and skills improved and their specific knowledge in those modules also improved radically. It was found that group work plays a very imperative role in enhancing the students＇ performance and collaboration in various foundation modules.
基金supported by the National Natural Science Foundation of China(61302095,61401165)the Natural Science Foundation of Fujian Province of China(2014J01243,2014J05076,2015J01262)the Huaqiao University Science Foundation(13Y0384)
文摘Maximum likelihood(ML) noncoherent block detection techniques are investigated for block-coded MPSK modulation in cooperative decode-and-forward relay systems over slow fading channels.A decision-directed iterative Viterbi algorithm(IVA) is derived for a suboptimal ML noncoherent detection.Simulation results show that the IVA can approach the error performances of the exhaustive detection method but at a lower complexity.
