Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Availability
Note in Lippert/Cloutier:
en: The simplest representation of availability is as a ratio of the expected value (E) of the uptime of a system to the aggregate of the expected values of up and down time:
A = E_{uptime}/(E_{uptime} + E_{downtime}) (1)
Classification of availability is based on the span of time to which the availability refers and to the type of downtime used.
Common classifications include instantaneous, mean, steady state, inherent, achieved, and operational.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Capacity
Note in Lippert/Cloutier:
en: The highest rate at which information can be reliably transmitted over a communication channel is a measure of its capacity.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Complexity of control
Note in Lippert/Cloutier:
en: Complexity is determined by the number of integrated factors being dealt with simultaneously.
When applied to the control of a system, it is the number and interrelations of the functions of a system that adjusts its operations as required.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Data rate
Note in Lippert/Cloutier:
en: The speed with which data can be transmitted from one device to another.
Data rates are often measured in megabits (million bits) or megabytes (million bytes) per second.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Digital size
Note in Lippert/Cloutier:
en: The size of a digital system can be measured in several ways but is often expressed as a measure of how much storage it consumes.
Typically, storage size is expressed in units of measurement based on the byte.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Ecological impact
Note in Lippert/Cloutier:
en: Ecological impact is the effect of system activities on living organisms and their nonliving environment.
Digital systems have ecological impact through their power and cooling needs, as well as their component production and disposal.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Efficiency
Note in Lippert/Cloutier:
en: Efficiency is a measurable concept, quantitatively determined by the ratio of useful output to total input. It indicates the system’s ability to avoid waste of materials, energy, and time in operation.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Elegance
Note in Lippert/Cloutier:
en: In general, elegance is unusual effectiveness, simplicity, and consistency of design.
In engineering, a solution may be considered elegant if it uses a nonobvious method to produce a solution which is highly effective and simple.
An elegant solution may solve multiple problems at once, especially problems not thought to be inter-related.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Fidelity of data
Note in Lippert/Cloutier:
en: Fidelity refers to the degree to which a model or simulation reproduces the state and behavior of a real-world object, feature or condition.
Fidelity is therefore a measure of the realism of a model or simulation, outputs of digital systems.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Latency
Note in Lippert/Cloutier:
en: The time delay experienced by a system during data communication is its latency.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Mean time between failure
Note in Lippert/Cloutier:
en: Mean time between failures (MTBF) is the predicted elapsed time between inherent failures of a mechanical or electronic system during normal system operation.
MTBF can be calculated as the average time between failures of a system.
The term is used for repairable systems, while mean time to failure (MTTF) denotes the expected time to failure for a nonrepairable system.
The definition of MTBF depends on the definition of what is considered a failure for the system.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Mean time to repair
Note in Lippert/Cloutier:
en: Mean time to repair (MTTR) is a basic measure of the maintainability of repairable items.
It represents the average time required to repair a failed component or device.
Expressed mathematically, the MTTR formula is the total maintenance time divided by the total number of maintenance actions over a specific period.
MTTR = total maintenance time/number of repairs (2)
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Memory capacity
Note in Lippert/Cloutier:
en: The memory capacity is the maximum or minimum amount of memory a computer or hardware device can have, or the required amount of memory required to run a process or program.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Memory efficiency
Note in Lippert/Cloutier:
en: This metric represents how efficiently the memory subsystem is used by the digital system.
It is a component of algorithmic efficiency which can be thought of as analogous to engineering productivity for a repeating or continuous process.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Number of dependencies
Note in Lippert/Cloutier:
en: In software engineering, coupling is the degree of interdependence between software modules.
It is a measure of how closely connected two routines or modules are and indicates the strength of the relationships between modules.
In digital systems, the number of dependencies can be measured as physical interdependence or as coupling.
Low coupling is often a sign of a well-structured computer system and a good design.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Precision of operation
Note in Lippert/Cloutier:
en: Precision in operations is a measure of reproducibility.
Variance can be introduced into systems through random numbers, varying levels of precision of calculations, and precision of inputs.
Types
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
http://www.w3.org/2004/02/skos/core#Concept
Preferred Label
en: Precision of output
Note in Lippert/Cloutier:
en: Precision of output in a digital system is a measure of the numerical precision required, as higher precision requires more capacity in communication, storage, and display.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Resource consumption
Note in Lippert/Cloutier:
en: Resource intensity is a measure of the quantity of resources (e.g., time, energy, materials) needed for the completion of a process or activity.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Scalability
Note in Lippert/Cloutier:
en: Scalability a measure of the capability of a system, network, or process to handle a growing amount of work, or its potential to be enlarged to accommodate that growth.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Security
Note in Lippert/Cloutier:
en: Security is freedom from, or resilience against, potential harm (or other unwanted coercive change) from external forces. It refers to protection from hostile forces, but it has a wide range of application.
Security also includes secrecy and containment of information when applied to digital system.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Throughput
Note in Lippert/Cloutier:
en: In a digital system, the throughput is the maximum rate at which data can be processed.
Types
http://www.w3.org/2004/02/skos/core#Concept
http://opendiscovery.org/rdf/Model#LippertGlossaryEntry
Preferred Label
en: Useful life
Note in Lippert/Cloutier:
en: Useful life is the estimated lifespan of any component of a digital system.
Useful life may be impacted by dependencies between system components.