ASIC-FRIENDLY SRV6-BASED SD-WAN SERVICE THEFT PREVENTION MECHANISM

Presented herein is a security mechanism that prevents service theft with software-defined networking in a wide area network (SD-WAN) services provided with Segment Routing over IPv6 dataplane (SRv6). The security mechanism described herein is valid in SRv6 deployments, but also provides line-rate security at PEs that do not have dedicated crypto-hardware

STRUCTURED FLOW LABEL

This proposal provides a technique to restructure a Flow Label into 4-bits of per‑flow flags and 16-bits of entropy within controlled domains. In various implementations, the flags may be used for performance information, Operations, Administration, and Maintenance (OAM), or the like. This proposal may allow providing a premium service on top of Internet Protocol version 6 (IPv6)

AN ADOPTIVE AND RESILIENT SEGMENT ROUTING VERSION 6 POLICY TO ADDRESS TIGHT SERVICE LEVEL AGREEMENT REQUIREMENTS IN 5G NETWORKS

There is ongoing work positioning Segment Routing version 6 (SRv6) as a replacement to General Packet Radio Service (GPRS) Tunneling Protocol User Plane (GTP-U). The main benefits of using SRv6 include coupling of the mobility overlay with the underlay (transport Traffic Engineering (TE)) and service chaining (GiLAN) and reusing high performance routers with SRv6 capabilities as User Plane Functions (UPFs). Techniques are described herein for enabling the creation of specific network slices where in the underlay a high resiliency is achieved with zero packet loss for tight Service Level Agreement (SLA) enterprise premium traffic. This same mechanism may be reused for path monitoring (e.g., latency, jitter, etc.) using in-band mechanisms for Ultra-Reliable Low Latency Communications (URLLC)

Segment Routing: a Comprehensive Survey of Research Activities, Standardization Efforts and Implementation Results

Fixed and mobile telecom operators, enterprise network operators and cloud providers strive to face the challenging demands coming from the evolution of IP networks (e.g. huge bandwidth requirements, integration of billions of devices and millions of services in the cloud). Proposed in the early 2010s, Segment Routing (SR) architecture helps face these challenging demands, and it is currently being adopted and deployed. SR architecture is based on the concept of source routing and has interesting scalability properties, as it dramatically reduces the amount of state information to be configured in the core nodes to support complex services. SR architecture was first implemented with the MPLS dataplane and then, quite recently, with the IPv6 dataplane (SRv6). IPv6 SR architecture (SRv6) has been extended from the simple steering of packets across nodes to a general network programming approach, making it very suitable for use cases such as Service Function Chaining and Network Function Virtualization. In this paper we present a tutorial and a comprehensive survey on SR technology, analyzing standardization efforts, patents, research activities and implementation results. We start with an introduction on the motivations for Segment Routing and an overview of its evolution and standardization. Then, we provide a tutorial on Segment Routing technology, with a focus on the novel SRv6 solution. We discuss the standardization efforts and the patents providing details on the most important documents and mentioning other ongoing activities. We then thoroughly analyze research activities according to a taxonomy. We have identified 8 main categories during our analysis of the current state of play: Monitoring, Traffic Engineering, Failure Recovery, Centrally Controlled Architectures, Path Encoding, Network Programming, Performance Evaluation and Miscellaneous...Comment: SUBMITTED TO IEEE COMMUNICATIONS SURVEYS & TUTORIAL

A task-based evaluation methodology for visual representation of dynamic networks

Current evaluation approaches for visualization strategies of dynamic networks are focused on maintaining the mental map ofthe network over the time or keeping a certain shape to make iteasy to navigate, however the available tools for analyzing temporal network have not been evaluated in terms of how easy to usethey are to perform exploratory data analysis tasks with dynamicnetworks. In this work we present an evaluation methodologythat guides the usability assessment of software tools used to analyze dynamic networks by using the standard ISO 9241-11. Thismethodology has been applied successfully with two popularopen source tools used to analyze temporal networks.ITESO, A.C

Estudio del efecto elastocalórico en aleaciones Ni-Mn-X (X=In, Ga)

"Se realizó un estudio del efecto elastocalórico en las aleaciones con memoria de forma Ni48.6Mn31.0In20.4 y Ni47.7Mn31.2Ga21.1. El estudio se realizó durante la transformación martensítica aplicando esfuerzo en compresión. La aleación Ni48.6Mn31.0In20.4 fue sintetizada mediante horno de arco y tratada térmicamente para homogeneización y ordenamiento químico. En ambas aleaciones se observó una dependencia en el cambio de entropía máxima alcanzada y capacidad refrigerativa en función del esfuerzo aplicado. La aleación Ni47.7Mn31.2Ga21.1 muestra una transformación intermartensítica, la cual contribuye notablemente en el cambio de entropía y capacidad refrigerativa respecto a la transformación únicamente martensítica. Se encontró que la aplicación de esfuerzo en compresión modifica la capacidad refrigerativa (RCP) obtenida a través del efecto elastocalórico. Se determinaron valores de RCP de 26.9 J/kg a 52.4 MPa y 33.2 J/kg a 13.7MPa para las aleaciones con Indio y Galio respectivamente.""A study of the elastocaloric effect has been carried out on Ni48.6Mn31.0In20.4 and Ni47.7Mn31.2Ga21.1 memory shape alloys. Measurements were performed during the martensistic transformation applying compression stresses. Ni48.6Mn31.0In20.4 alloy was elaborated by arc melting and was heat treated for homogenization and for chemical ordering. Both alloys have shown dependence between the maximum entropy change achieved and the relative cooling power with applied stress. The Ni47.7Mn31.2Ga21.1 alloy exhibits an intermartensitic transformation, which modifies significantly the entropy change and relative cooling power compared to the martensitic transformation only. It was found that the application of a compression stress modifies the relative cooling power (RCP) due the elastocaloric effect. Values of RCP were calculated for Ni48.6Mn31.0In20.4 and Ni47.7Mn31.2Ga21.1 as 26.9 J/kg at 52.4 MPa and 33.2 J/kg at 13.7MPa respectively.

ALC1/eIF4A1-mediated regulation of CtIP mRNA stability controls DNA end resection

During repair of DNA double-strand breaks, resection of DNA ends influences how these lesions will be repaired. If resection is activated, the break will be channeled through homologous recombination; if not, it will be simply ligated using the non-homologous end-joining machinery. Regulation of resection relies greatly on modulating CtIP, which can be done by modifying: i) its interaction partners, ii) its post-translational modifications, or iii) its cellular levels, by regulating transcription, splicing and/or protein stability/degradation. Here, we have analyzed the role of ALC1, a chromatin remodeler previously described as an integral part of the DNA damage response, in resection. Strikingly, we found that ALC1 affects resection independently of chromatin remodeling activity or its ability to bind damaged chromatin. In fact, it cooperates with the RNA-helicase eIF4A1 to help stabilize the most abundant splicing form of CtIP mRNA. This function relies on the presence of a specific RNA sequence in the 5' UTR of CtIP. Therefore, we describe an additional layer of regulation of CtIP-at the level of mRNA stability through ALC1 and eIF4A1

The Helicase PIF1 Facilitates Resection over Sequences Prone to Forming G4 Structures

DNA breaks are complex lesions that can be repaired either by non-homologous end joining (NHEJ) or by homologous recombination (HR). The decision between these two routes of DNA repair is a key point of the DNA damage response (DDR) that is controlled by DNA resection. The core machinery catalyzing the resection process is well established. However, little is known about the additional requirements of DNA resection over DNA structures with high complexity. Here, we found evidence that the human helicase PIF1 has a role in DNA resection, specifically for defined DNA regions, such as those prone to form G-quadruplexes. Indeed, PIF1 is recruited to the site of DNA damage and physically interacts with proteins involved in DNA resection, and its depletion causes DNA damage sensitivity and a reduction of HR efficiency. Moreover, G4 stabilization by itself hampers DNA resection, a phenomenon suppressed by PIF1 overexpressio

Recovery of heavy metals by means of ultrafiltration with water-soluble polymers: Calculation of design parameters

A process for recovery heavy metals — Cu(II), Ni(II), Pb(II) and Cd(II) — from industrial wastewaters has been studied. This process is called PSU (Polymer Supported Ultrafiltration), and includes complexation of metallic ions with polymers (polyethyleneimine — PEI, or poly(acrylic) acid — PAA), in order to make this solution flow through an ultrafiltration ceramic membrane and to obtain two different streams: permeate (nearly free of metal) and retentate (with high complex concentration). In a previous stage, complex stoichiometries and stabilities have been exhaustively studied by UV/visible absorbance spectrophotometry and potentiometric measures. Next, optimum operating conditions and best pH values affecting to permeate flux, complex formation, further polymer regeneration and polymer capacities have been achieved by means of ultrafiltration experiments. Flux and concentration values measured with these processes have been modeled with concentration polarization model, and mass transfer coefficients (k) and polarization concentrations (cm) have been obtained for different operation conditions. These data are not commonly reported in previous literature, although they are important for scale-up to an industrial process.Peer reviewe