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Network virtualization is widely considered as a mainstay for overcoming the Internet’s ossification problem, and virtual network embedding (VNE) is a critical issue. Over recent years, growing energy costs and increased ecological awareness have stimulated the interest in reducing energy consumption by Internet service providers (ISP). Dependability is also an important requirement, as it involves...
Mobile devices have become quite popular, and they are responsible for a significant part of Internet traffic. In these devices, multimedia services, such as video streaming over HTTP, are commonly adopted, and TCP protocol is the standard to assure reliable data transmission. To deal with applications that require higher bandwidth, several modifications were made on TCP, and they are called extensions...
Network virtualization has been considered as a mainstay for the success of overcoming the Internet's ossification problem, as it provides many advantages including scalability, traffic isolation, infrastructure abstraction and the promise of efficient use of network resources. Over recent years, Internet Service Providers (ISPs) have been particularly interested in reducing energy consumption in...
Network virtualization has been pointed as a promising approach to solve Internet’s current ossification. A major challenge is the mapping of virtual networks (VNs) onto the substrate network due to its NP-hard nature, and, thus, several heuristics have been proposed aiming to achieve efficient allocations. However, the existing approaches only focus on performance, and dependability issues are usually...
Network virtualization has been pointed out as a promising technique to tackle Internet's current ossification and to mitigate sustainability issues related to energy consumption. A critical issue is the virtual network embedding (VNE), due to the NP-hard nature of the problem. Thus, several heuristics have been proposed aiming to achieve efficient allocations. In this paper, we extend the VNE problem...
Virtualized networks are a promising approach to deal with the current ossification problem of Internet. A major challenge is related to virtual network (VN) mapping, as it is a NP-hard problem. Thus, several heuristics have been proposed aiming to achieve efficient allocation, but they do not consider dependability issues, which directly impact quality of service. This paper proposes a Greedy Randomized...
Virtualized Networks (VN) has been pointed by the scientific community as a promising way to solve the current ossification problem of the Internet, since several heterogeneous VN can coexist on a shared physical infrastructure. An important issue for VN allocation algorithms is related to dependability, since components of the physical network are failure-prone (issue not considered by several techniques)...
The scientific community has devoted attention to virilization in hard real-time systems, motivating the development of many hierarchical scheduling techniques for dealing with stringent timing constraints for such systems. Most techniques are based on runtime scheduling methods and they provide important results concerning schedulability analysis. However, there are situations in which runtime methods...
One of the key characteristics of virtual networks (VN) is their intrinsic dynamical aspects. VNs allow network operators to have on-demand negotiation of a variety of services. Risks are inherent to virtualized infrastructures since the underlying physical network components are failure-prone. Therefore evaluation and analysis of risks in VNs, from assessment of dependability attributes, are of paramount...
Background Lung cancer is the leading cause of cancer-related deaths among males and the second among females. The importance of lung cancer is a major public health problem and there is a need to find effective therapies for its management. Erlotinib has been approved to treat non-small-cell lung cancer. The author's experience in the use of erlonitib in lung cancer patients in Mexico City is described...
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