The regression of instruction to life raises as a developmental tendency of course reform among the world. Emphasis on the connection between instruction and students' lives has become an important aspect of curri...The regression of instruction to life raises as a developmental tendency of course reform among the world. Emphasis on the connection between instruction and students' lives has become an important aspect of curriculum reform. The student learner's role and the development of students' potentials in their lives also have been emphasized; all these conceptions provide broad space for the implementation of life-orientation of instruction. Situational teaching emphasizes that students should be regarded as the nucleus of the class. Through acquiring knowledge by themselves, they can bear the knowledge in their mind and improve their communicating ability. The teaching activity should always obey the rule of students centered and teacher aided and make sure that the teaching atmosphere can be kept in an authentic situation. And the most important thing that will be talked about is how to apply situational teaching in Junior Middle English Class.展开更多
To reduce network redundancy,innetwork caching is considered in many future Internet architectures,such as Information Centric Networking.In in-network caching system,the item sojourn time of LRU(Least Recently Used) ...To reduce network redundancy,innetwork caching is considered in many future Internet architectures,such as Information Centric Networking.In in-network caching system,the item sojourn time of LRU(Least Recently Used) replacement policy is an important issue for two reasons:firstly,LRU is one of the most common used cache policy;secondly,item sojourn time is positively correlated to the hit probability,so this metric parameter could be useful to design the caching system.However,to the best of our knowledge,the sojourn time hasn't been studied theoretically so far.In this paper,we first model the LRU cache policy by Markov chain.Then an approximate closedform expression of the item expectation sojourn time is provided through the theory of stochastic service system,which is a function of the item request rates and cache size.Finally,extensive simulation results are illustrated to show that the expression is a good approximation of the item sojourn time.展开更多
The Distributed Queue Dual Bus(DQDB) Metropolitan Area Network(MAN) is a promising solution for the evolution from current networks to B-ISDN. The performance of the DQDB MAN for Local Area Networks(LANs) interconnect...The Distributed Queue Dual Bus(DQDB) Metropolitan Area Network(MAN) is a promising solution for the evolution from current networks to B-ISDN. The performance of the DQDB MAN for Local Area Networks(LANs) interconnection is analyzed. The effects of message length, traffic load of upstream and downstream nodes and the parameters of bandwidth balancing mechanism and network counters on the sojourn time of message in the buffer are investigated, which present a valuable reference for the implementation of the DQDB MAN.展开更多
In this paper we devote ourselves to extending Berman’s sojourn time method,which is thoroughly described in[1-3],to investigate the tail asymptotics of the extrema of a Gaussian random field over[0,T]^(d) with T∈(0...In this paper we devote ourselves to extending Berman’s sojourn time method,which is thoroughly described in[1-3],to investigate the tail asymptotics of the extrema of a Gaussian random field over[0,T]^(d) with T∈(0,∞).展开更多
As two of the main challenges for students studying abroad,ethnocentrism and language barrier are the most common issues they will probably encounter.The essay will illustrate these two aspects separately.
文摘The regression of instruction to life raises as a developmental tendency of course reform among the world. Emphasis on the connection between instruction and students' lives has become an important aspect of curriculum reform. The student learner's role and the development of students' potentials in their lives also have been emphasized; all these conceptions provide broad space for the implementation of life-orientation of instruction. Situational teaching emphasizes that students should be regarded as the nucleus of the class. Through acquiring knowledge by themselves, they can bear the knowledge in their mind and improve their communicating ability. The teaching activity should always obey the rule of students centered and teacher aided and make sure that the teaching atmosphere can be kept in an authentic situation. And the most important thing that will be talked about is how to apply situational teaching in Junior Middle English Class.
文摘To reduce network redundancy,innetwork caching is considered in many future Internet architectures,such as Information Centric Networking.In in-network caching system,the item sojourn time of LRU(Least Recently Used) replacement policy is an important issue for two reasons:firstly,LRU is one of the most common used cache policy;secondly,item sojourn time is positively correlated to the hit probability,so this metric parameter could be useful to design the caching system.However,to the best of our knowledge,the sojourn time hasn't been studied theoretically so far.In this paper,we first model the LRU cache policy by Markov chain.Then an approximate closedform expression of the item expectation sojourn time is provided through the theory of stochastic service system,which is a function of the item request rates and cache size.Finally,extensive simulation results are illustrated to show that the expression is a good approximation of the item sojourn time.
基金Supported by the National Natural Science Foundation of Chinathe Foundation of the Institute of Electronic Science of China
文摘The Distributed Queue Dual Bus(DQDB) Metropolitan Area Network(MAN) is a promising solution for the evolution from current networks to B-ISDN. The performance of the DQDB MAN for Local Area Networks(LANs) interconnection is analyzed. The effects of message length, traffic load of upstream and downstream nodes and the parameters of bandwidth balancing mechanism and network counters on the sojourn time of message in the buffer are investigated, which present a valuable reference for the implementation of the DQDB MAN.
基金partially supported by National Natural Science Foundation of China(11701070,71871046)Ronglian Scholarship Fund.
文摘In this paper we devote ourselves to extending Berman’s sojourn time method,which is thoroughly described in[1-3],to investigate the tail asymptotics of the extrema of a Gaussian random field over[0,T]^(d) with T∈(0,∞).
文摘As two of the main challenges for students studying abroad,ethnocentrism and language barrier are the most common issues they will probably encounter.The essay will illustrate these two aspects separately.
