bearing capability - ορισμός. Τι είναι το bearing capability
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Τι (ποιος) είναι bearing capability - ορισμός

COMPUTER SECURITY MODEL
Object-capability; Object capability; Object capability model; Object-capability language

Plain bearing         
  • Split bi-material bushings: a metal exterior with an inner plastic coating
  • A graphite-filled groove bushing
  • A schematic of a journal bearing under a hydrodynamic lubrication state showing how the journal centerline shifts from the bearing centerline.
  • An early [[pillow block bearing]] with a [[whitemetal]] plain bearing
SIMPLEST TYPE OF BEARING, COMPRISING JUST A BEARING SURFACE AND NO ROLLING ELEMENTS
Journal (mechanical device); Journal bearing; Plastic bearing; Journal (mechanics); Plastic bearings; Journal bearings; Sleeve bearing; Slide bearing; Sliding bearing; Friction bearing; Bushing (bearing); Plane bearing; Plain bearings; Thrust washer; Shell (machinery); Shell (mechanism); Class III plain bearing; Simple bearing; Bearing journal; Journal (mechanical engineering)
A plain bearing, or more commonly sliding contact bearing and slide bearing (in railroading sometimes called a solid bearing, journal bearing, or friction bearing), is the simplest type of bearing, comprising just a bearing surface and no rolling elements. Therefore, the [(i.
Rolling-element bearing         
  • A cylindrical roller bearing
  • A prematurely failed rear bearing cone from a [[mountain bicycle]], caused by a combination of [[pitting]] due to wet conditions, improper lubrication, improper pre-load adjustment, and fatigue from frequent shock loading.
  • A gear bearing
  • 256x256px
  • A needle roller bearing
  • A spherical roller bearing
  • A tapered roller bearing
  • A thrust roller bearing
  • 142x142px
BEARING CARRYING A LOAD USING ROLLING ELEMENTS
Roller bearing; Roller Bearing; Rolling element bearing; Roller bearings; Cage (bearing); Rolling-element bearings; Rolling bearing; Roller-bearing
In mechanical engineering, a rolling-element bearing, also known as a rolling bearing,ISO 15 is a bearing which carries a load by placing rolling elements (such as balls or rollers) between two concentric, grooved rings called races. The relative motion of the races causes the rolling elements to roll with very little rolling resistance and with little sliding.
Roller bearing         
  • A cylindrical roller bearing
  • A prematurely failed rear bearing cone from a [[mountain bicycle]], caused by a combination of [[pitting]] due to wet conditions, improper lubrication, improper pre-load adjustment, and fatigue from frequent shock loading.
  • A gear bearing
  • 256x256px
  • A needle roller bearing
  • A spherical roller bearing
  • A tapered roller bearing
  • A thrust roller bearing
  • 142x142px
BEARING CARRYING A LOAD USING ROLLING ELEMENTS
Roller bearing; Roller Bearing; Rolling element bearing; Roller bearings; Cage (bearing); Rolling-element bearings; Rolling bearing; Roller-bearing
·add. ·- A bearing containing friction rollers.

Βικιπαίδεια

Object-capability model

The object-capability model is a computer security model. A capability describes a transferable right to perform one (or more) operations on a given object. It can be obtained by the following combination:

  • An unforgeable reference (in the sense of object references or protected pointers) that can be sent in messages.
  • A message that specifies the operation to be performed.

The security model relies on not being able to forge references.

  • Objects can interact only by sending messages on references.
  • A reference can be obtained by:
  1. Initial conditions: In the initial state of the computational world being described, object A may already have a reference to object B.
  2. Parenthood: If A creates B, at that moment A obtains the only reference to the newly created B.
  3. Endowment: If A creates B, B is born with that subset of A's references with which A chose to endow it.
  4. Introduction: If A has references to both B and C, A can send to B a message containing a reference to C. B can retain that reference for subsequent use.

In the object-capability model, all computation is performed following the above rules.

Advantages that motivate object-oriented programming, such as encapsulation or information hiding, modularity, and separation of concerns, correspond to security goals such as least privilege and privilege separation in capability-based programming.

The object-capability model was first proposed by Jack Dennis and Earl C. Van Horn in 1966.