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High-Performance Switch/Routers
Published in James Aweya, Designing Switch/Routers, 2023
By defining MIB views, an SNMP agent can have better control over which SNMP entities can access specific branches and objects within its MIB tree. Each OID represents a subtree of an MIB object hierarchy. So, each object of an MIB view has a common OID prefix. As well as having a unique name, an MIB view consists of a collection of SNMP OIDs, which are either explicitly included (in the MIB view) or excluded. Once created, the MIB view is assigned to an SNMPv3 group (of data users) or SNMPv1/v2c community (or multiple SNMPv1/v2c communities), and automatically masking which parts of the MIB tree belonging to the SNMP agent, the group or community members can (or cannot) access. A group identifies a collection of SNMPv3 or SNMPv1/v2c data users that share the same VACM access privileges or policy.
Object-Oriented Programming in LabVIEW
Published in Rick Bitter, Taqi Mohiuddin, Matt Nawrocki, LabVIEW™ Advanced Programming Techniques, 2017
Rick Bitter, Taqi Mohiuddin, Matt Nawrocki
The object analysis presented in Section 10.3 works very well in object-oriented languages. Our implementation does have some problems with inheritance, and we will have to simplify the design to make implementation easier. Abstract classes for the analyzers and generators have a single property and a handful of pure virtual methods. As virtual methods are not usable in our implementation, we will remove them. We will still make use of the IEEE 488.2 class and the GPIB Instrument class. The object hierarchy is greatly simplified. The communications analyzer descends from IEEE 488.2 Instrument, which is a natural choice. The generators, RF and AF, appear on the left side of the communications analyzer. This is an arbitrary choice as there is no special significance to this location. The analyzers appear on the right. The arrow connecting the communications analyzer to the component objects denotes aggregation. Recall that aggregated classes are properties of the owning class; they do not exist without the owning class. This is a natural extension of the object model; this model reflects the real configuration of the instrument. At this point we can claim a milestone in the development: the object analysis is now complete.
Multiscale Habitat Mapping and Monitoring Using Satellite Data and Advanced Image Analysis Techniques
Published in Prasad S. Thenkabail, Land Resources Monitoring, Modeling, and Mapping with Remote Sensing, 2015
Stefan Lang, Christina Corbane, Palma Blonda, Kyle Pipkins, Michael Förster
One strategy to tackle this variability is the use of object-based image analysis (OBIA) (Lang 2008). is is typically done through the combination of spectral behavior and spatial variability, either from the details available through high-spatial-resolution imagery (Johansen et al. 2007, Strasser and Lang 2014b) or through the inclusion of data from active sensors such as LiDAR (Mücher et al. 2014). Object-based class modeling allows for mapping complex, hierarchical habitat systems, such as forest habitats. Forest composition including intermixture of nonnative tree species was modeled in a six-level hierarchical representation in a riparian seminatural forest by Strasser and Lang (2014b). VHRI from WorldView-2 provided the required spatial and spectral details for a multiscale image segmentation and rule-based composition. An image object hierarchy was established to delineate forest stands, stands of homogenous tree species and single trees represented by sunlit tree crowns.
Using Ontologies to Share Access Control Information in Rural Business Process Outsourcing
Published in IETE Journal of Research, 2021
Apart from these core relations, NA-DOBAM has two more relations to ease the administration of roles and objecttype. Role Hierarchy, adopted from the RBAC model represents a hierarchy between two roles, as it happens in real-world scenarios, where some roles are juniors to other senior ones. In this case, senior roles inherit permissions of the junior roles and need not be explicitly specified. Another hierarchical relationship between object types (for example, dob and doblet) is depicted using the concept of Object Hierarchy. They are formally defined as: Role Hierarchy RH ⊆R ×R, a partial order between roles.Object Hierarchy OH ⊆OT ×OT, a partial order between object types.
Reliability assessment of ageing infrastructures: an interdisciplinary methodology
Published in Structure and Infrastructure Engineering, 2020
Andreas Panenka, François Marie Nyobeu Fangue, Rolf Rabe, Heike Schmidt-Bäumler, Julia Sorgatz
Using the object hierarchy available in WSVPruf, the functional units, their requirements and related cause–effect chains are determined. The object hierarchy makes a distinction between four major structural components of a HSS: steel structure, supports, actuators and sealing system. Assuming the steel structure to be the load-bearing component, its specific requirements define the load-bearing capacity (LBC), the service life or durability (Tservice) and service limit states (SLS). The assignment of the available damage data sets to the cause–effect chains corresponding to the requirements works as filter sorting the data sets according to the affected requirement (Figure 15). The filtered data sets enable the existing assessment algorithm of WSVPruf to consider only the damages directly affecting a certain requirement and to generate the corresponding specific condition grades (e.g. ; Figure 16).
Innovative and sustainable operation and maintenance of bridges
Published in Structure and Infrastructure Engineering, 2020
The principle of Building Information Modelling (BIM) is used in modern asset management systems in all stages of new infrastructure projects, i.e. design, construction and operation (Jackson, 2018). Many bridge owners would like to use this technology for existing bridges as well. The first step would be to establish a 3D model of the geometry. A combination of scanning and imagery has proved successful for the establishment of a 3D model. In this way owners move from ‘dead’ data in paper records to ‘live’ digital data based on the principle of BIM, which can be used in asset management. This model shall act as a link between the object hierarchy and the information related to each object. For an existing structure, a basic BIM system would contain the following information:Object Identification Number (OIN), which would be part of an Object Information System (OIS).Basic structural information, e.g. material data, production information (supplier, date of manufacture, etc.), design load, virgin safety and serviceability (COST TU1406).O&M-related documents, e.g. manuals, inspection plans, inspection reports, monitoring data, reassessments, etc.As-built documentation, particularly drawings.