| Look up reduction in Wiktionary, the free dictionary. |
Reduction, reduced, or reduce may refer to:
Contents |
Science
Chemistry
- Reduction – part of a reduction-oxidation (redox) reaction in which atoms have their oxidation number (oxidation state) changed.
- Reduced gas – a gas with a low oxidation number
- Ore reduction: see smelting
Computing and algorithms
- Reduction (complexity) – a transformation of one problem into another problem.
- Graph reduction – an efficient version of non-strict evaluation
- Strength reduction – a compiler optimization where a function of some systematically changing variable is calculated more efficiently by using previous values of the function
- Reduction (recursion theory) – given sets A and B of natural numbers, is it possible to effectively convert a method for deciding membership in B into a method for deciding membership in A?
- L-reduction – a transformation of optimization problems which keeps the approximability features
- Variance reduction – a procedure used to increase the precision of the estimates that can be obtained for a given number of iterations
- Partial order reduction – a technique for reducing the size of the state-space to be searched by a model checking algorithm
- Bit Rate Reduction – an audio compression method
- Reduce (computer algebra system) – a general-purpose computer algebra system geared towards applications in physics
- Reduce (higher-order function) – in functional programming, a family of higher-order functions that process a data structure in some order and build up a return value
- Reduced instruction set computer – a CPU design philosophy that favors an instruction set reduced both in size and complexity of addressing modes, in order to enable easier implementation, greater instruction level parallelism, and more efficient compilers
Pure mathematics and statistics
- Reduction (mathematics) – the rewriting of an expression into a simpler form
- Beta reduction – the rewriting of an expression from lambda calculus into a simpler form
- Dimension reduction – the process of reducing the number of random variables under consideration
- Lattice reduction – given an integer lattice basis as input, to find a basis with short, nearly orthogonal vectors
- Reduction of order – a technique for solving second-order ordinary differential equations
- Relation reduction – the extent to which a given relation is determined by an indexed family or a sequence of other relations, called the relation dataset
- Reduction of the structure group – for a G-bundle B and a map an H-bundle BH such that the pushout is isomorphic to B
- Reduction system, reduction strategy, the application of rewriting systems to eliminate reducible expressions.
- Reduced form – in statistics, an equation which relates the endogenous variable X to all the available exogenous variables, both those included in the regression of interest (W) and the instruments (Z)
- Reduced ring – a ring with no non-zero nilpotent elements
- Reduced residue system – a set of φ(n) integers such that each integer is relatively prime to n and no two are congruent modulo n
- Reduced product – a construction that generalizes both direct product and ultraproduct
- Reduced word – in a free group, a word with no adjacent generator-inverse pairs
- Reduced homology – a minor modification made to homology theory in algebraic topology, designed to make a point have all its homology groups zero
- Reduced row echelon form – a certain reduced row echelon form of a matrix which completely and uniquely determines its row space
Physics
- Dimensional reduction – the limit of a compactified theory where the size of the compact dimension goes to zero
- Reduction criterion – in quantum information theory, a necessary condtion a mixed state must satisfy in order for it to be separable
- Reduced temperature – of a fluid means the actual temperature, divided by its critical temperature
- Reduced mass – the "effective" inertial mass appearing in the two-body problem of Newtonian mechanics
Technology
- Noise reduction – acoustic or signal processing
- Reduction drive – a mechanical device to shift rotational speed
Philosophy
- Reduction (philosophy) – the process by which one object, property, concept, theory, etc., is shown to be entirely dispensable in favor of another
- Intertheoretic reduction – in philosophy of science, one theory makes predictions that perfectly or almost perfectly match the predictions of a second theory
- Eidetic reduction – a technique in the study of essences in phenomenology whose goal is to identify the basic components of phenomena
Medicine
- Weight loss
- Selective reduction – (or fetal reduction), the practice of reducing the number of fetuses in a multifetal pregnancy
- Reduction (orthopedic surgery) – a medical procedure to restore a fracture or dislocation to the correct alignment.
- Ventricular reduction – a type of operation in cardiac surgery
- Urea reduction ratio – (URR), a dimensionless number used to quantify hemodialysis treatment adequacy
Cosmetic surgery
Epidemiology
- Relative risk reduction – the absolute risk reduction by the control event rate
- Absolute risk reduction – the decrease in risk of a given activity or treatment in relation to a control activity or treatment.
Linguistics
- Accent reduction – modifying one's foreign accent towards that of a native speaker
- Vowel reduction – any change in vowel quality perceived as "weakening"
- Relaxed pronunciation – slurring of syllables of common words
- Definite article reduction – use of vowel-less forms of the English definite article in Northern England
Politics and social policy
- Harm reduction – a philosophy of public health, intended to be a progressive alternative to the prohibition of certain potentially dangerous lifestyle choices
- Immigration reduction
- Paperwork reduction – reducing red tape
- Poverty reduction
- Risk reduction – risk management by reducing the severity of an eventuated risk
- Waste minimisation
History
- Lithic reduction – in Stone Age toolmaking, to detach lithic flakes from a lump of tool stone
- Reduction (Sweden) – return to the Crown of fiefs that had been granted to the Swedish nobility
- Indian Reductions – settlements in Spanish America intended to assimilate Indians
Other
- Reduction (cooking) – the process of thickening or intensifying the flavor of a liquid mixture such as a soup, sauce, wine, or juice by evaporation
- Reduction to practice – in United States patent law, the embodiment of the concept of an invention
- Reduction in rank – military law
- Piano reduction – sheet music for the piano that was once music for other instruments that was reduced to its most basic components within a two line staff for piano
- Ego reduction – predicated on the use of Sigmund Freud's concept of the ego
See also
| This disambiguation page lists articles associated with the same title. If an internal link led you here, you may wish to change the link to point directly to the intended article. |
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Is the file quality reduced due to compression and decompression?
Q. Sometimes we need to compress file size for audio/video files (which are generally huge in size) to save space. Is the audio or video quality reduced due to this? How do we know which of the many programs available are good/bad in this respect? Please suggest which compressing programs are good for audio/video/text file like pdf/ps?
Asked by A. R. - Sat Sep 6 10:09:31 2008 - - 3 Answers - 0 Comments
A. Yes, quality is generally reduced by greater compression. If it were not then things would probably always be compressed as much as possible. Although mpeg is the most popular compression for audio and video, Ogg is actually much better. Ogg Vorbis for audio and, I think, Ogg Theora for video. Their compression to quality ratio is much better than mpeg (mp3 is an mpeg standard) and, curiously, Ogg is open, while mpeg is proprietary. I'm not so familiar with text file compression. I wouldn't consider pdf so much of a compression format, however, as its purpose is more one of portability and impermeability. PDF is not intended to be edited.
Answered by Solar Granulation - Sat Sep 6 10:21:08 2008
Q. Sometimes we need to compress file size for audio/video files (which are generally huge in size) to save space. Is the audio or video quality reduced due to this? How do we know which of the many programs available are good/bad in this respect? Please suggest which compressing programs are good for audio/video/text file like pdf/ps?
Asked by A. R. - Sat Sep 6 10:09:31 2008 - - 3 Answers - 0 Comments
A. Yes, quality is generally reduced by greater compression. If it were not then things would probably always be compressed as much as possible. Although mpeg is the most popular compression for audio and video, Ogg is actually much better. Ogg Vorbis for audio and, I think, Ogg Theora for video. Their compression to quality ratio is much better than mpeg (mp3 is an mpeg standard) and, curiously, Ogg is open, while mpeg is proprietary. I'm not so familiar with text file compression. I wouldn't consider pdf so much of a compression format, however, as its purpose is more one of portability and impermeability. PDF is not intended to be edited.
Answered by Solar Granulation - Sat Sep 6 10:21:08 2008
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