By analyzing the difference of protocol construction angle and equipment processing angle between VPLS whose core is MPLS and VPLS two-layer networking model whose core network in IP network, this paper has proposed t...
详细信息
ISBN:
(纸本)9781479942732
By analyzing the difference of protocol construction angle and equipment processing angle between VPLS whose core is MPLS and VPLS two-layer networking model whose core network in IP network, this paper has proposed that PE equipment performance is easy to overload because VPLS two-layer networking model based on IP costs a large number of resource when constructing GRE or GREoIP sec. It has gathered and analyzed the core equipment performance under different architectures in GNS3 simulation environment. Comparing with the consumption situation of the present popular core equipment performance under different architectures, this paper has proposed the present optimal two-layer interconnection model which has combined VPLS, network virtualization technology and link aggregation technology.
Colored Dissolved Organic Matter (CDOM, or yellow substance) exists in all natural waters. It can be used as evaluation indexes for inland water pollution condition. Remote sensing data used for CDOM inversion has its...
详细信息
ISBN:
(纸本)9781628413281
Colored Dissolved Organic Matter (CDOM, or yellow substance) exists in all natural waters. It can be used as evaluation indexes for inland water pollution condition. Remote sensing data used for CDOM inversion has its significant advantages, but the inversion method usually has obvious regional limitations. At present, there is little CDOM studies have been carried out to the waters in north China. Yuqiao Reservoir, which is in northern Tianjin, was chosen as the study area, and CDOM was inverted through empirical method for the first time. The data used in this paper was the spectral reflectance data collected on September 24 and 25, 2013 over the 23 sampling points in Yuqiao Reservoir and CDOM concentrations (which is represented by the absorption coeffiecnet of CDOM at 440nm, a(CDOM)(440)) of each sampling points. Among the 23 sampling points, 16 points were selected randomly as training samples, and the remaining 7 points were for accuracy test. Four ratios, as R-rs(412)/R-rs(551), R-rs(443)/R-rs(551), R-rs(490)/R-rs(551) and R-rs(531)/R-rs(551) were used to carry out linear regression with a(CDOM)(440). At the same time, the linear regression was also taken between the logs base 10 of the four ratios and log(a(CDOM)(440)). Then 8 inversion models were built. The performance of the model based on log(R-rs(490)/R-rs(551)) and log(a(CDOM)(440)) was the best. The correlation coefficient R was 0.65. The Root Mean Square Error (RMSE) was 0.088 and the average relative error (sigma) was 11.9%. It showed that the precision of using the ratio of the Remote sensing reflectance of the blue and green band to build inversion models for Yuqiao Reservoir was good, and the method was worth popularization and utilization.
An improved 4H-SiC MESFETs with varied p-buffer layer thickness is proposed, and the static and dynamic electrical performances are analyzed in this paper. The variation in p-buffer layer depth leads to the change in ...
详细信息
With the popularity of the Internet, virtual brand community has become an important platform for enterprises to communicate with customers. This paper constructs a customer loyalty measurement model including four di...
详细信息
Oxygen is crucial for normal tissue function and repair. We have developed a toolkit of optical oxygen sensors that can be made into a wide range of materials and form factors for biomedical sensing applications. ...
详细信息
This paper defines conditions for ensuring recursive feasibility and asymptotic stability of Model Predictive Control (MPC) for nonlinear systems subject to time-varying state constraints. Such constraints may arise f...
详细信息
ISBN:
(纸本)9783907144008
This paper defines conditions for ensuring recursive feasibility and asymptotic stability of Model Predictive Control (MPC) for nonlinear systems subject to time-varying state constraints. Such constraints may arise from interaction with a dynamically evolving environment. For the cases that the change of the constraints is known to be bounded, or that a prediction model for the change of the constraints is available, we provide conditions under which recursive feasibility and asymptotic stability is guaranteed.
In this paper, a NURBS approach based on MPEG-4 standard for facial modeling is presented. In this method, human face is simulated by using a piece of NURBS surface, and the model points of NURBS surface are affected ...
详细信息
Accompanying the arrival of the ISDN there are some technological factors which, present us with new opportunities. Among these are numbered the ease of provision of Centrex and Virtual Private Networking (VPN) with t...
详细信息
Accompanying the arrival of the ISDN there are some technological factors which, present us with new opportunities. Among these are numbered the ease of provision of Centrex and Virtual Private Networking (VPN) with the ISDN in place, the need to reconsider national and international numbering and the need to re-examine the ways in which the local network should be provided. All these factors are discussed at some length. This paper takes them a stage further and examines how the telecommunications community, users, network providers, manufacturers and standards authorities, ought to react to these changes by J. Ronayne (1990). The discussion starts with a look at the technological and organisational factors which constitute the 'credit balance' for telecommunications in the 1990s and attempts to show how our telecommunications strategies should be changed as a result of their existence.
暂无评论