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What is the formula for process capability when only LSL is given?
Wiki User
∙ 13y ago
process capability = std deviation - lsl / 6 sigma
Wiki User
∙ 13y ago
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What is the definition of Cp and Cpk in Statistical process control?
Cp is the capability of a process and Cpk is the actual capability of a part running in the process. The only way Cp = Cpk is if the process mean is exactly centered which is seldom the case in manufacturing. Therefore, Cp > or = to Cpk.
What is difference between capabilities list and access list?
1. Access Control ListsAn ACL system has at least five namespaces whose relationships need to be considered:The namespace of file names: /tmp/fooThe namespace of unique object identifiers: (dev 22, inode 36, type file)The namespace of user identities (uid 52476)For each object type (file, disk, terminal, ...), the namespace of operations that object can perform.The namespace of process identifiers (process 719)In an access list system, it is assumed that there are two global mappings:principal: process identity -> user identityfs_lookup: file name -> object identity That is, every process has an assigned user identity and every file name can be translated into a unique object identifier. Hanging off of every unique object is a further mapping:acl: (object identity, user identity) -> operation(s) Given a process proc that wishes to perform an operation op on an object object, the protection mechanism in an access list system is to test the following predicate:op in acl(object, principal(p)) In the special case of the "open" call, this test is modified to be:op in acl(fs_lookup(filename), principal(p)) 2. Capability SystemsA capability system has at least four namespaces whose relationships need to be considered:The namespace of unique object identifiers: (dev 22, inode 36, type file)For each object type (file, disk, terminal, ...), the namespace of operations that object can perform.The namespace of process identifiers (process 719)The namespace of capabilities (object 10, operation set S)In a capability system, it is assumed that there is one local mapping for each processcap: (process identity, index) -> capability That is, every process has a list of capabilities. Each capability names an object and also names a set of legal operations on that object.There are also two "accessor" functions:obj: capability -> object identityops: capability -> operations Given a process proc that wishes to perform an operation op on an object object, the process must first possess a capability naming that object. That is, it must possess a capability at some index i such thatobject == obj(caps(p,i)) To perform an operation, the process names the "index" iof that capability to be invoked from the per-process list. The protection mechanism in a capability system is to test the following predicate:op in ops(caps(p,i)) Capability systems typically do not have a distinguished "open" call.3. Some Differences This section is incomplete.Simply comparing the predicates shows that there is a significant difference between the two systems:ACL: op in acl(object, principal(p)) Capability: op in ops(caps(p,i)) An obvious difference is that the capability model makes no reference to any notion of "principal".Another obvious difference is that the capability model has a parameter "i". This allows the process to specify whichauthority it wants to exercise, which is why only the capability model can solve the confused deputy problem.
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