Scientific Research Publishing

Read  full  paper  at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=54093#.VO14CSzQrzE Author(s)  Maria Catarina Taful 1 , João Pires 1,2   Affiliation(s) 1 Department of Electrical and Computer Engineering, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal . 2 Institute of Telecommunications, Instituto Superior Técnico, University of Lisbon, Lisbon, Portugal . ABSTRACT A dynamic Optical Transport Network (OTN) has the advantage of being able to adjust the connection capacity on demand in order to respond to variations on traffic patterns or to network failures. This feature has the potential to reduce operational costs and at the same time to optimize networks resources. Virtual Concatenation (VCAT) and Link Capacity Adjustment Scheme (LCAS) are two techniques that when properly combined can be used to provide improved dynamism in OTN networks. These techniques have been previously standardized in the ...

Read full paper at: http://www.scirp.org/journal/PaperInformation.aspx?PaperID=50913#.VFB-HlfHRK0 Author(s) Huahua Cao , Shujing Gao , Xiangyu Zhang , Youquan Luo Affiliation(s) College of Mathematics and Computer Science, Gannan Normal University, Ganzhou, China . ABSTRACT From the lifecycle of schistosome, the phenomenon of time delay is widespread. In this paper, a two-dimensional system is studied that incorporates two time delays which are the incubation period of human and snail, respectively. Our purpose is to demonstrate that the time delays are harmless for stability of equilibria of the system. Further, sufficient conditions of stability of equilibria are obtained. ...