In the teaching of listening comprehension, teachers should be guided by a learner-centered philosophy. Decisions about what will be taught, how it will be taught, when it will be taught, and how it will be assessed w...In the teaching of listening comprehension, teachers should be guided by a learner-centered philosophy. Decisions about what will be taught, how it will be taught, when it will be taught, and how it will be assessed will be made with reference to the learner. With the assistance and guidance of the teacher, learners will develop the ability of learning and therefore enhance their listening comprehension.展开更多
Virtual time Ethemet is a multiple access protocol proposed to provide FCFS transmission service over the predominant Ethemet bus. It incorporates a novel message-rescheduling algorithm based on the virtual clock mech...Virtual time Ethemet is a multiple access protocol proposed to provide FCFS transmission service over the predominant Ethemet bus. It incorporates a novel message-rescheduling algorithm based on the virtual clock mechanism. By manipulating virtual clocks back up over a common virtual time axis and performing timely collision resolution, the algorithm guarantees the system＇s queuing strictness. The protocol is particularly modeled as a finite state machine and implemented using OPNET tools. Simulation studies prove its correctness and effectiveness.展开更多
文摘In the teaching of listening comprehension, teachers should be guided by a learner-centered philosophy. Decisions about what will be taught, how it will be taught, when it will be taught, and how it will be assessed will be made with reference to the learner. With the assistance and guidance of the teacher, learners will develop the ability of learning and therefore enhance their listening comprehension.
基金Supported by the National Natural Science Foundation of China （No. 69984003）, 863/CIMS High Technology Foundation （No. 511-845-008） and Science and Technology Phosphor Program of Shanghai （No. 990D14012）.
文摘Virtual time Ethemet is a multiple access protocol proposed to provide FCFS transmission service over the predominant Ethemet bus. It incorporates a novel message-rescheduling algorithm based on the virtual clock mechanism. By manipulating virtual clocks back up over a common virtual time axis and performing timely collision resolution, the algorithm guarantees the system＇s queuing strictness. The protocol is particularly modeled as a finite state machine and implemented using OPNET tools. Simulation studies prove its correctness and effectiveness.
