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Lookahead (other)
Lookahead or Look Ahead may refer to: * A parameter of some combinatorial search algorithms, describing how deeply the graph representing the problem is explored * A parameter of some parsing algorithms; the maximum number of tokens that a parser can use to decide which rule to use * In dynamic range compression, a signal processing design to avoid compromise between slow attack rates that produce smooth-sounding gain changes, and fast attack rates capable of catching transients * Look-ahead (backtracking), a subprocedure that attempts to predict the effects of choosing a branching variable to evaluate or one of its values * Lookahead carry unit, a logical unit in digital circuit design used to decrease calculation time in adder units * Look Ahead, a charitable housing association in London * In regular expressions, an assertion to match characters after the current position Education *''Look Ahead'', 1990s English as a foreign language multimedia classroom project by BBC Englis ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Combinatorial Search
{{no footnotes, date=January 2013 In computer science and artificial intelligence, combinatorial search studies search algorithms for solving instances of problems that are believed to be hard in general, by efficiently exploring the usually large solution space of these instances. Combinatorial search algorithms achieve this efficiency by reducing the effective size of the search space or employing heuristics. Some algorithms are guaranteed to find the optimal solution, while others may only return the best solution found in the part of the state space that was explored. Classic combinatorial search problems include solving the eight queens puzzle or evaluating moves in games with a large game tree, such as reversi or chess. A study of computational complexity theory helps to motivate combinatorial search. Combinatorial search algorithms are typically concerned with problems that are NP-hard. Such problems are not believed to be efficiently solvable in general. However, the vari ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Parsing
Parsing, syntax analysis, or syntactic analysis is the process of analyzing a string of symbols, either in natural language, computer languages or data structures, conforming to the rules of a formal grammar. The term ''parsing'' comes from Latin ''pars'' (''orationis''), meaning part (of speech). The term has slightly different meanings in different branches of linguistics and computer science. Traditional sentence parsing is often performed as a method of understanding the exact meaning of a sentence or word, sometimes with the aid of devices such as sentence diagrams. It usually emphasizes the importance of grammatical divisions such as subject and predicate. Within computational linguistics the term is used to refer to the formal analysis by a computer of a sentence or other string of words into its constituents, resulting in a parse tree showing their syntactic relation to each other, which may also contain semantic and other information (p-values). Some parsing algor ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Dynamic Range Compression
Dynamic range compression (DRC) or simply compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds, thus reducing or ''compressing'' an audio signal's dynamic range. Compression is commonly used in sound recording and reproduction, broadcasting, sound reinforcement system, live sound reinforcement and in some instrument amplifiers. A dedicated electronic hardware unit or audio software that applies compression is called a compressor. In the 2000s, compressors became available as software plugins that run in digital audio workstation software. In recorded and live music, compression parameters may be adjusted to change the way they affect sounds. Compression and limiting are identical in process but different in degree and perceived effect. A limiter is a compressor with a high #Ratio, ratio and, generally, a short #Attack and release, attack time. Types There are two types of compression, downward and upward. Bot ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Look-ahead (backtracking)
In backtracking algorithms, look ahead is the generic term for a subprocedure that attempts to foresee the effects of choosing a branching variable to evaluate one of its values. The two main aims of look-ahead are to choose a variable to evaluate next and the order of values to assign to it. Constraint satisfaction In a general constraint satisfaction problem, every variable can take a value in a domain. A backtracking algorithm therefore iteratively chooses a variable and tests each of its possible values; for each value the algorithm is recursively run. Look ahead is used to check the effects of choosing a given variable to evaluate or to decide the order of values to give to it. Look ahead techniques The simpler technique for evaluating the effect of a specific assignment to a variable is called forward checking. Given the current partial solution and a candidate assignment to evaluate, it checks whether another variable can take a consistent value. In other words, it first ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lookahead Carry Unit
A lookahead carry unit (LCU) is a logical unit in digital circuit design used to decrease calculation time in adder units and used in conjunction with carry look-ahead adder A carry-lookahead adder (CLA) or fast adder is a type of electronics adder used in digital logic. A carry-lookahead adder improves speed by reducing the amount of time required to determine carry bits. It can be contrasted with the simpler, b ...s (CLAs). 4-bit adder A single 4-bit CLA is shown below: 16-bit adder By combining four 4-bit CLAs, a 16-bit adder can be created but additional logic is needed in the form of an LCU. The LCU accepts the group propagate (P_G) and group generate (G_G) from each of the four CLAs. P_G and G_G have the following expressions for each CLA adder: :P_G = P_3 \cdot P_2 \cdot P_1 \cdot P_0 :G_G = G_3 + P_3 \cdot G_2 + P_3 \cdot P_2 \cdot G_1 + P_3 \cdot P_2 \cdot P_1 \cdot G_0 The LCU then generates the carry input for each CLA. Assume that P_i is P_G and G_i is G_G f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Look Ahead
Look Ahead is a charitable housing association based in East London which was established in 1973. It was involved in the Rough Sleepers Initiative in the 1990s and originally ran a number of large hostels. The last big hostel closed in 2012 and it now provides smaller more specialist services. In 2017 it had more than 1000 staff and was supporting more than 6500 people with mental health problems, learning disabilities, homelessness and young care leavers. It runs the Tabard Forensic Service, in Tower Hamlets, in partnership with East London NHS Foundation Trust East London NHS Foundation Trust is an NHS foundation trust which provides health services in East London and specialist services to a wider region. History The trust was established as the East London and The City Mental Health NHS Trust on 3 ... and the London Borough of Tower Hamlets, which provides residential step down support for secure forensic patients. Look Ahead invested £500,000 to refurbish and adapt ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Regular Expression
A regular expression (shortened as regex or regexp; sometimes referred to as rational expression) is a sequence of characters that specifies a search pattern in text. Usually such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation. Regular expression techniques are developed in theoretical computer science and formal language theory. The concept of regular expressions began in the 1950s, when the American mathematician Stephen Cole Kleene formalized the concept of a regular language. They came into common use with Unix text-processing utilities. Different syntaxes for writing regular expressions have existed since the 1980s, one being the POSIX standard and another, widely used, being the Perl syntax. Regular expressions are used in search engines, in search and replace dialogs of word processors and text editors, in text processing utilities such as sed and AWK, and in lexical analysis. Most gener ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Perl Compatible Regular Expressions
Perl Compatible Regular Expressions (PCRE) is a library written in C, which implements a regular expression engine, inspired by the capabilities of the Perl programming language. Philip Hazel started writing PCRE in summer 1997. PCRE's syntax is much more powerful and flexible than either of the POSIX regular expression flavors (BRE, ERE) and than that of many other regular-expression libraries. While PCRE originally aimed at feature-equivalence with Perl, the two implementations are not fully equivalent. During the PCRE 7.x and Perl 5.9.x phase, the two projects have coordinated development, with features being ported between them in both directions. In 2015 a fork of PCRE was released with a revised programming interface (API). The original software, now called PCRE1 (the 1.xx–8.xx series), has had bugs mended, but no further development. , it is considered obsolete, and the current 8.45 release is likely to be the last. The new PCRE2 code (the 10.xx series) has had a numb ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English As A Foreign Language
English as a second or foreign language is the use of English by speakers with different native languages. Language education for people learning English may be known as English as a second language (ESL), English as a foreign language (EFL), English as an additional language (EAL), English as a New Language (ENL), or English for speakers of other languages (ESOL). The aspect in which ESL is taught is referred to as teaching English as a foreign language (TEFL), teaching English as a second language (TESL) or teaching English to speakers of other languages (TESOL). Technically, TEFL refers to English language teaching in a country where English is not the official language, TESL refers to teaching English to non-native English speakers in a native English-speaking country and TESOL covers both. In practice, however, each of these terms tends to be used more generically across the full field. TEFL is more widely used in the UK and TESL or TESOL in the US. The term "ESL" has ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Look Ahead (Pat Boone Album)
''Look Ahead'' is a studio album by Pat Boone, released in 1968 on Dot Records Dot Records was an American record label founded by Randy Wood (record producer), Randy Wood and Gene Nobles that was active between 1950 and 1978. The original headquarters of Dot Records were in Gallatin, Tennessee. In 1956, the company moved .... It became his last album for the label. Track listing References {{Authority control 1968 albums Pat Boone albums Dot Records albums ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gerald Veasley
Gerald Veasley (born July 28, 1955) is an American jazz bass guitarist. Veasley was born and raised in Philadelphia, Pennsylvania, where he played in R&B groups as a teenager. He worked with Joe Zawinul from 1988 to 1995, and began releasing his own records in 1992. He has also done extensive work as a studio musician. His 2008 release ''Your Move'' hit No. 12 on the U.S. '' Billboard'' Top Contemporary Jazz Albums chart. Chart Positions Allmusic.com Veasley has also worked as a smooth jazz DJ on WJJZ in Philadelphia. Bass Bootcamp In 2002 Veasley founded his own Bass Bootcamp in Philadelphia with Roxanne Veasley and Lee Patterson. The camp has served over 700 bass players from all around world as well as other professionals like Marcus Miller, Stanley Clarke, Michael Manring, Victor Wooten, and many more. The camp lasts for 2 days and students are taught many important musical skills by the instructors such as:learning how to groove, creating bass lines, improving your e ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Danny Tenaglia
Daniel "Danny" Tenaglia (born March 7, 1961) is an American DJ and record producer. He is a Grammy nominee for the best remixed recording (44th Annual Grammy Award). He is also a three time International Dance Music Award winner, 3 time DJ Awards winner and 2 time Muzik Awards recipient. Biography Early life At the age of ten, Tenaglia started to collect records. In 1979, he began going to nightclub Paradise Garage, where DJ Larry Levan's genre-less blend of music appealed to him. This was the club model Tenaglia would one day emulate: Levan's bold style, the venue's plain décor, and the party's warmth and inclusiveness. Tenaglia left New York in 1985 and started DJing in Miami as a resident at Cheers nightclub, playing classic New York and Chicago house. He returned to New York five years later. At this time, he started to create some remixes, including Right Said Fred's "I'm Too Sexy" (1991), Jamiroquai's "Emergency on Planet Earth" (1993), and Madonna's "Human Nature" (1 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
