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VERIFICATION
Verify or verification may refer to: General * Verification and validation, in engineering or quality management systems, is the act of reviewing, inspecting or testing, in order to establish and document that a product, service or system meets regulatory or technical standards ** Verification (spaceflight), in the space systems engineering area, covers the processes of qualification and acceptance * Verification theory, philosophical theory relating the meaning of a statement to how it is verified * Third-party verification, use of an independent organization to verify the identity of a customer * Authentication, confirming the truth of an attribute claimed by an entity, such as an identity * Forecast verification, verifying prognostic output from a numerical model * Verifiability (science), a scientific principle * Verification (audit), an auditing process Computing * Punched card verification, a data entry step performed after keypunching on a separate, keyboard-equipped machi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Verification (audit)
Verification means "proving the truth" or "confirmation". Verification is an auditing process in which auditor satisfy himself with the actual existence of assets and liabilities appearing in the Statement of Financial position.http://accountlearning.blogspot.com/2012/02/concept-of-verification-and-valuation.html Definition of Verification Verification is usually conducted through examination of existence, ownership, title, possession, proper valuation and presence of any charge of lien over assets. Thus, verification includes verifying: # The existence of the assets and liabilities. # Legal ownership and possession of the assets # Correct valuation, and # Ascertaining that the asset is free from any charge Verification in an audit process can be done offsite or onsite. Offsite verification means verification by checking documents, official records, photos and by questioning staff responsible or otherwise trusted to be a reliable source for the facility in verification. Onsi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Verification And Validation
Verification and validation (also abbreviated as V&V) are independent procedures that are used together for checking that a product, service, or system meets requirements and specifications and that it fulfills its intended purpose. These are critical components of a quality management system such as ISO 9000. The words "verification" and "validation" are sometimes preceded with "independent", indicating that the verification and validation is to be performed by a disinterested third party. "Independent verification and validation" can be abbreviated as "IV&V". In practice, as quality management terms, the definitions of verification and validation can be inconsistent. Sometimes they are even used interchangeably. However, the PMBOK guide, a standard adopted by the Institute of Electrical and Electronics Engineers (IEEE), defines them as follows in its 4th edition: * "Validation. The assurance that a product, service, or system meets the needs of the customer and other iden ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Formal Verification
In the context of hardware and software systems, formal verification is the act of proving or disproving the correctness of intended algorithms underlying a system with respect to a certain formal specification or property, using formal methods of mathematics. Formal verification can be helpful in proving the correctness of systems such as: cryptographic protocols, combinational circuits, digital circuits with internal memory, and software expressed as source code. The verification of these systems is done by providing a formal proof on an abstract mathematical model of the system, the correspondence between the mathematical model and the nature of the system being otherwise known by construction. Examples of mathematical objects often used to model systems are: finite-state machines, labelled transition systems, Petri nets, vector addition systems, timed automata, hybrid automata, process algebra, formal semantics of programming languages such as operational semantics, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Verification Bias
In statistics, verification bias is a type of measurement bias in which the results of a diagnostic test affect whether the gold standard procedure is used to verify the test result. This type of bias is also known as "work-up bias" or "referral bias". In clinical practice, verification bias is more likely to occur when a preliminary diagnostic test is negative. Because many gold standard tests can be invasive, expensive, and carry a higher risk (e.g. angiography, biopsy, surgery), patients and physicians may be more reluctant to undergo further work-up if a preliminary test is negative. In cohort studies A cohort study is a particular form of longitudinal study that samples a cohort (a group of people who share a defining characteristic, typically those who experienced a common event in a selected period, such as birth or graduation), performing ..., obtaining a gold standard test on every patient may not always be ethical, practical, or cost effective. These studies can thus b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Verifiable Computing
Verifiable computing (or verified computation or verified computing) enables a computer to offload the computation of some function, to other perhaps untrusted clients, while maintaining verifiable results. The other clients evaluate the function and return the result with a proof that the computation of the function was carried out correctly. The introduction of this notion came as a result of the increasingly common phenomenon of "outsourcing" computation to untrusted users in projects such as SETI@home and also to the growing desire of weak clients to outsource computational tasks to a more powerful computation service like in cloud computing. The concept dates back to work by Babai et al., and has been studied under various terms, including "checking computations" (Babai et al.), "delegating computations", "certified computation", and verifiable computing. The term ''verifiable computing'' itself was formalized by Rosario Gennaro, Craig Gentry, and Bryan Parno, and echoes Mic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Validation (other)
Validation may refer to: * Data validation, in computer science, ensuring that data inserted into an application satisfies defined formats and other input criteria * Forecast verification, validating and verifying prognostic output from a numerical model * Regression validation, in statistics, determining whether the outputs of a regression model are adequate * Social validation, compliance in a social activity to fit in and be part of the majority * Statistical model validation, determining whether the outputs of a statistical model are acceptable * Validation (drug manufacture), documenting that a process or system meets its predetermined specifications and quality attributes * Validation (gang membership), a formal process for designating a criminal as a member of a gang * Validation of foreign studies and degrees, processes for transferring educational credentials between countries * Validation therapy, a therapy developed by Naomi Feil for older people with cognitive impairment ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physical Verification
Physical verification is a process whereby an integrated circuit layout (IC layout) design is verified via EDA software tools to ensure correct electrical and logical functionality and manufacturability. Verification involves design rule check (DRC), layout versus schematic (LVS), XOR (exclusive OR), antenna checks and electrical rule check (ERC).A. Kahng, et al.: ''VLSI Physical Design: From Graph Partitioning to Timing Closure'', , , p. 10. Design Rule Check (DRC) DRC verifies that the layout meets all technology-imposed constraints. DRC also verifies layer density for chemical-mechanical polishing (CMP). Layout Versus Schematic (LVS) LVS verifies the functionality of the design. From the layout, a netlist is derived and compared with the original netlist produced from logic synthesis or circuit design. XOR check This check is typically run after a metal spin, where the original and modified database are compared. This is done to confirm that the desired modifications have ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analog Verification
Analog verification is a methodology for performing functional verification on analog, mixed-signal and RF integrated circuits and systems on chip.Henry Chang and Ken KundertVerification of Complex Analog and RF IC Designs ''Proceedings of the IEEE'', February 2007. Discussion of analog verification began in 2005 when it started to become recognized that the analog portion of large mixed-signal chips had become so complex that a significant and ever increasing number of these chips were being designed with functional errors in the analog portion that prevented them from operating correctly. Technical details Analog verification is built on the idea that transistor level simulation will always be too slow to provide adequate functional verification. Instead, it is necessary to build simple and efficient models of the blocks that make up the analog portion of the design and use those to verify the design. Those models are typically written in Verilog or Verilog-AMS, but could also ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Functional Verification
In electronic design automation, functional verification is the task of verifying that the logic design conforms to specification. Functional verification attempts to answer the question "Does this proposed design do what is intended?" This is a complex task, and takes the majority of time and effort in most large electronic system design projects. Functional verification is a part of more encompassing ''design verification'', which, besides functional verification, considers non-functional aspects like timing, layout and power. Functional verification is very difficult because of the sheer volume of possible test-cases that exist in even a simple design. Frequently there are more than 10^80 possible tests to comprehensively verify a design – a number that is impossible to achieve in a lifetime. This effort is equivalent to program verification, and is NP-hard or even worse – and no solution has been found that works well in all cases. However, it can be attacked by many meth ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hardware Verification
Electronic design automation (EDA), also referred to as electronic computer-aided design (ECAD), is a category of software tools for designing electronic systems such as integrated circuits and printed circuit boards. The tools work together in a design flow that chip designers use to design and analyze entire semiconductor chips. Since a modern semiconductor chip can have billions of components, EDA tools are essential for their design; this article in particular describes EDA specifically with respect to integrated circuits (ICs). History Early days Prior to the development of EDA, integrated circuits were designed by hand and manually laid out. Some advanced shops used geometric software to generate tapes for a Gerber photoplotter, responsible for generating a monochromatic exposure image, but even those copied digital recordings of mechanically drawn components. The process was fundamentally graphic, with the translation from electronics to graphics done manually; t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Software Verification
Software verification is a discipline of software engineering whose goal is to assure that software fully satisfies all the expected requirements. Broad scope and classification A broad definition of verification makes it equivalent to software testing. In that case, there are two fundamental approaches to verification: * ''Dynamic verification'', also known as experimentation, dynamic testing or, simply testing. - This is good for finding faults (software bugs). * ''Static verification'', also known as analysis or, static testing - This is useful for proving the correctness of a program. Although it may result in false positives when there are one or more conflicts between the process a software really does and what the static verification assumes it does. Dynamic verification (Test, experimentation) Dynamic verification is performed during the execution of software, and dynamically checks its behavior; it is commonly known as the Test phase. Verification is a Review Proce ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Runtime Verification
Runtime verification is a computing system analysis and execution approach based on extracting information from a running system and using it to detect and possibly react to observed behaviors satisfying or violating certain properties. Some very particular properties, such as datarace and deadlock freedom, are typically desired to be satisfied by all systems and may be best implemented algorithmically. Other properties can be more conveniently captured as formal specifications. Runtime verification specifications are typically expressed in trace predicate formalisms, such as finite state machines, regular expressions, context-free patterns, linear temporal logics, etc., or extensions of these. This allows for a less ad-hoc approach than normal testing. However, any mechanism for monitoring an executing system is considered runtime verification, including verifying against test oracles and reference implementations . When formal requirements specifications are provided, moni ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
