My mother is a worker in a factory and she is very busy every day.After got1up at six o'clock,she brushes her teeth and washes her face.Then she does breakfast2for us.She often has breakfast at half past six and s...My mother is a worker in a factory and she is very busy every day.After got1up at six o'clock,she brushes her teeth and washes her face.Then she does breakfast2for us.She often has breakfast at half past six and she goes to work at seven.She works for eight hours every day.She often gets home at six thirty in the evening.Then she cooks dinner for us.After dinner,she watches TV or reads books for a while.Sometimes she helps me with my homework.She usually goes to bed about3twenty to eleven.展开更多
Recently, integrating Softwaredefined networking(SDN) and network functions virtualization(NFV) are proposed to address the issue that difficulty and cost of hardwarebased and proprietary middleboxes management. Howev...Recently, integrating Softwaredefined networking(SDN) and network functions virtualization(NFV) are proposed to address the issue that difficulty and cost of hardwarebased and proprietary middleboxes management. However, it lacks of a framework that orchestrates network functions to service chain in the network cooperatively. In this paper, we propose a function combination framework that can dynamically adapt the network based on the integration NFV and SDN. There are two main contributions in this paper. First, the function combination framework based on the integration of SDN and NFV is proposed to address the function combination issue, including the architecture of Service Deliver Network, the port types representing traffic directions and the explanation of terms. Second, we formulate the issue of load balance of function combination as the model minimizing the standard deviations of all servers' loads and satisfying the demand of performance and limit of resource. The least busy placement algorithm is introduced to approach optimal solution of the problem. Finally, experimental results demonstrate that the proposed method can combine functions in an efficient and scalable way and ensure the load balance of the network.展开更多
This paper considers an M/G/1 queue with Poisson rate lambda > 0 and service time distribution G(t) which is supposed to have finite mean 1/mu. The following questions are first studied: (a) The closed bounds of th...This paper considers an M/G/1 queue with Poisson rate lambda > 0 and service time distribution G(t) which is supposed to have finite mean 1/mu. The following questions are first studied: (a) The closed bounds of the probability that waiting time is more than a fixed value; (b)The total busy time of the server, which including the distribution, probability that are more than a fixed value during a given time interval (0, t], and the expected value. Some new and important results are obtained by theories of the classes of life distributions and renewal process.展开更多
Sector capacity estimation plays an important role in applied research of airspace management.Previous researches manifest that sector capacity should be influenced by its standard flow,or routes in that sector.Howeve...Sector capacity estimation plays an important role in applied research of airspace management.Previous researches manifest that sector capacity should be influenced by its standard flow,or routes in that sector.However,if air traffic controller(ATCO)workload busy levels(level of proactivity of an ATCO)are ignored,the estimated sector capacity may not be accurate.There is a need to compare the estimated sector capacity with and without busy levels consideration,both with differentiated routes consideration.This paper proposes a method for sector capacity estimation based on ATCO workload considering differentiated routes and busy levels.Firstly,the main routes in the sector are identified,and for each route,the ATCO workload per flight is determined.Secondly,the workload for each route at three busy levels is determined.Regression analysis is then applied to determine the relationship between workload and the number of flights(with and without considering busy levels)in 15 min and 1h time slices.Sector capacity is then determined on the basis of a specified workload threshold,for the two cases with and without considering busy levels.Comparing the two scenarios and following validation by ATCO survey,it is found that capacity estimation considering busy levels is a more realistic and accurate approach.The validated capacity values for the Zhengzhou approach(ZHCC AP)airspace sector accounting for the busy levels were determined accurately as 10 and 33 flights for the 15 min and 1h slices,respectively.The corresponding results without considering busy levels were 12 and 41 flights for the 15 min and 1h time slices,respectively.展开更多
I’m a middle school student.I’m 13 years old.I’m very busy every day.I must get up at half past five in the morning.I have breakfast at six and go to school at half past six.School starts at six forty-five.I have f...I’m a middle school student.I’m 13 years old.I’m very busy every day.I must get up at half past five in the morning.I have breakfast at six and go to school at half past six.School starts at six forty-five.I have four classes in the morning.I have lunch at展开更多
This project adopts double-slide prestressed concrete beam pushing technology, which is continuous, controllable, efficient and safe to realize single-span large-span gantry pier hat beam pushing construction, which c...This project adopts double-slide prestressed concrete beam pushing technology, which is continuous, controllable, efficient and safe to realize single-span large-span gantry pier hat beam pushing construction, which can be used for reference to the existing railway similar projects. During construction, the concrete cap beam is hung externally on the slide beam through the embedded leg, and the concrete beam does not directly contact with the slide beam. A self-propelled jacking device is used to carry out two-point jacking. In the process of jacking, the concrete cap beam is always in the form of simple support to ensure the safety of jacking construction.展开更多
Setting off from Lhasa we followed Lhasa River,passing through Chushur County,then,driving along the banks of the Yarlung Tsangpo River,we finally arrived at Nyemo Bridge.Next we headed northward and into a long valle...Setting off from Lhasa we followed Lhasa River,passing through Chushur County,then,driving along the banks of the Yarlung Tsangpo River,we finally arrived at Nyemo Bridge.Next we headed northward and into a long valley.Finally,we reached Nyemo County.Although it was not a big county,it looked much more prosperous than Palgon County.A large government office building greeted us in a main street offering shops,both big and small,as well as restaurants-which also caught our eye.Nevertheless,the wandering la...展开更多
Anewly married sailor was informed by theNavy that he was going to be stationed along way from home on a remote island inthe Pacific for a year.A few weeks After he gotthere he began to miss his new wife,so he wrotehe...Anewly married sailor was informed by theNavy that he was going to be stationed along way from home on a remote island inthe Pacific for a year.A few weeks After he gotthere he began to miss his new wife,so he wroteher a letter.“My love,”he wrote,“we are going to he apartfor a very long time.Already I m starting to missyou and there s really not much to do here in展开更多
In the Kigongo area of Mwanza Region,northwest Tanzania,fishmonger Neema Aisha remembers how the morning’s fresh catch would sour while she queued for the ferry,putting her business at risk.
A booming economy and an ever-expanding foreign trade have boosted China's total volume of air cargo eightfold in the past decade with an annual growth of 17 percent
Since uprooting myself from a sentimental hutong inside the Second Ring Road to the outlying outer east Fifth Ring Road about a month ago,I am still in the process of acquainting myself with the new surroundings.To th...Since uprooting myself from a sentimental hutong inside the Second Ring Road to the outlying outer east Fifth Ring Road about a month ago,I am still in the process of acquainting myself with the new surroundings.To the locals,life has gone on unchanged.But for a foreigner,everything seems to be refreshingly new.展开更多
Stellaand Jim trytoget toa New Year Party on time.Will they be late?Stella and Jim are going to buy something for their friend Sofie's New Year Party."The party starts at nine o'clock.We have three hours ...Stellaand Jim trytoget toa New Year Party on time.Will they be late?Stella and Jim are going to buy something for their friend Sofie's New Year Party."The party starts at nine o'clock.We have three hours to go,"Jim says.展开更多
文摘My mother is a worker in a factory and she is very busy every day.After got1up at six o'clock,she brushes her teeth and washes her face.Then she does breakfast2for us.She often has breakfast at half past six and she goes to work at seven.She works for eight hours every day.She often gets home at six thirty in the evening.Then she cooks dinner for us.After dinner,she watches TV or reads books for a while.Sometimes she helps me with my homework.She usually goes to bed about3twenty to eleven.
基金supported by the Foundation for Innovative Research Groups of the National Science Foundation of China (Grant No.61521003)The National Basic Research Program of China(973)(Grant No.2012CB315901,2013CB329104)+1 种基金The National Natural Science Foundation of China(Grant No.61372121,61309019,61309020)The National High Technology Research and Development Program of China(863)(Grant No.2015AA016102,2013AA013505)
文摘Recently, integrating Softwaredefined networking(SDN) and network functions virtualization(NFV) are proposed to address the issue that difficulty and cost of hardwarebased and proprietary middleboxes management. However, it lacks of a framework that orchestrates network functions to service chain in the network cooperatively. In this paper, we propose a function combination framework that can dynamically adapt the network based on the integration NFV and SDN. There are two main contributions in this paper. First, the function combination framework based on the integration of SDN and NFV is proposed to address the function combination issue, including the architecture of Service Deliver Network, the port types representing traffic directions and the explanation of terms. Second, we formulate the issue of load balance of function combination as the model minimizing the standard deviations of all servers' loads and satisfying the demand of performance and limit of resource. The least busy placement algorithm is introduced to approach optimal solution of the problem. Finally, experimental results demonstrate that the proposed method can combine functions in an efficient and scalable way and ensure the load balance of the network.
基金This work was suPPorted by the Natiotal Out-standing YOuth Sdence FOundstion (79725tX)2) the suPporting program of the Nat
文摘This paper considers an M/G/1 queue with Poisson rate lambda > 0 and service time distribution G(t) which is supposed to have finite mean 1/mu. The following questions are first studied: (a) The closed bounds of the probability that waiting time is more than a fixed value; (b)The total busy time of the server, which including the distribution, probability that are more than a fixed value during a given time interval (0, t], and the expected value. Some new and important results are obtained by theories of the classes of life distributions and renewal process.
基金partially supported by the National Natural Science Foundation of China(No.61304190)the Fundamental Research Funds for the Central Universities(No.NJ20140018)
文摘Sector capacity estimation plays an important role in applied research of airspace management.Previous researches manifest that sector capacity should be influenced by its standard flow,or routes in that sector.However,if air traffic controller(ATCO)workload busy levels(level of proactivity of an ATCO)are ignored,the estimated sector capacity may not be accurate.There is a need to compare the estimated sector capacity with and without busy levels consideration,both with differentiated routes consideration.This paper proposes a method for sector capacity estimation based on ATCO workload considering differentiated routes and busy levels.Firstly,the main routes in the sector are identified,and for each route,the ATCO workload per flight is determined.Secondly,the workload for each route at three busy levels is determined.Regression analysis is then applied to determine the relationship between workload and the number of flights(with and without considering busy levels)in 15 min and 1h time slices.Sector capacity is then determined on the basis of a specified workload threshold,for the two cases with and without considering busy levels.Comparing the two scenarios and following validation by ATCO survey,it is found that capacity estimation considering busy levels is a more realistic and accurate approach.The validated capacity values for the Zhengzhou approach(ZHCC AP)airspace sector accounting for the busy levels were determined accurately as 10 and 33 flights for the 15 min and 1h slices,respectively.The corresponding results without considering busy levels were 12 and 41 flights for the 15 min and 1h time slices,respectively.
文摘I’m a middle school student.I’m 13 years old.I’m very busy every day.I must get up at half past five in the morning.I have breakfast at six and go to school at half past six.School starts at six forty-five.I have four classes in the morning.I have lunch at
文摘This project adopts double-slide prestressed concrete beam pushing technology, which is continuous, controllable, efficient and safe to realize single-span large-span gantry pier hat beam pushing construction, which can be used for reference to the existing railway similar projects. During construction, the concrete cap beam is hung externally on the slide beam through the embedded leg, and the concrete beam does not directly contact with the slide beam. A self-propelled jacking device is used to carry out two-point jacking. In the process of jacking, the concrete cap beam is always in the form of simple support to ensure the safety of jacking construction.
文摘Setting off from Lhasa we followed Lhasa River,passing through Chushur County,then,driving along the banks of the Yarlung Tsangpo River,we finally arrived at Nyemo Bridge.Next we headed northward and into a long valley.Finally,we reached Nyemo County.Although it was not a big county,it looked much more prosperous than Palgon County.A large government office building greeted us in a main street offering shops,both big and small,as well as restaurants-which also caught our eye.Nevertheless,the wandering la...
文摘Anewly married sailor was informed by theNavy that he was going to be stationed along way from home on a remote island inthe Pacific for a year.A few weeks After he gotthere he began to miss his new wife,so he wroteher a letter.“My love,”he wrote,“we are going to he apartfor a very long time.Already I m starting to missyou and there s really not much to do here in
文摘In the Kigongo area of Mwanza Region,northwest Tanzania,fishmonger Neema Aisha remembers how the morning’s fresh catch would sour while she queued for the ferry,putting her business at risk.
文摘A booming economy and an ever-expanding foreign trade have boosted China's total volume of air cargo eightfold in the past decade with an annual growth of 17 percent
文摘Since uprooting myself from a sentimental hutong inside the Second Ring Road to the outlying outer east Fifth Ring Road about a month ago,I am still in the process of acquainting myself with the new surroundings.To the locals,life has gone on unchanged.But for a foreigner,everything seems to be refreshingly new.
文摘Stellaand Jim trytoget toa New Year Party on time.Will they be late?Stella and Jim are going to buy something for their friend Sofie's New Year Party."The party starts at nine o'clock.We have three hours to go,"Jim says.
