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Topic: A star search algorithm

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	A* search algorithm - Wikipedia, the free encyclopedia
		The A* search algorithm (pronounced "A star") is a graph search algorithm that finds a path from a given initial node to a given goal node (or one passing a given goal test).
		The A* algorithm is therefore an example of best-first search.
		Algorithm A cannot rule out the possibility, based on the heuristic information it has, that a path through that node might have a lower cost.
	en.wikipedia.org /wiki/A-star_search_algorithm (1305 words)

	A* search algorithm -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		The A* search algorithm (pronounced "A star") is a (Click link for more info and facts about graph search algorithm) graph search algorithm that finds a path from a given initial ((astronomy) a point where an orbit crosses a plane) node to a given goal node (or one passing a given goal test).
		The A* algorithm is therefore an example of (Click link for more info and facts about best-first search) best-first search.
		If A* uses a (A commonsense rule (or set of rules) intended to increase the probability of solving some problem) heuristic that never overestimates the distance (or in general, the cost) to the goal, A* can be proven to be admissible.
	www.absoluteastronomy.com /encyclopedia/A/A/A_search_algorithm.htm (1294 words)

	Doctor Search -- Recommendations and Resources (Site not responding. Last check: 2007-10-20)
		Other authors have used best-first search to refer specifically to a search with a heuristic that attempts to predict how close the end of a path is to a solution, so that paths which are judged to be closer to a solution are extended first.
		One may search for an item that is known to exist, with the intent to locate it, and one may search for an item whose existence is uncertain, in order to ascertain whether it exists or not.
		Searching can also be a metaphorical act, most frequently in reference to intangibles such as memories and emotions.
	www.becomingapediatrician.com /health/43/doctor-search.html (854 words)

	Search algorithm - Enpsychlopedia (Site not responding. Last check: 2007-10-20)
		In computer science, a search algorithm, broadly speaking, is an algorithm that takes a problem as input and returns a solution to the problem, usually after evaluating a number of possible solutions.
		Brute-force search or "naïve"/uninformed search algorithms use the simplest, most intuitive method of searching through the search space, whereas informed search algorithms use heuristics to apply knowledge about the structure of the search space to try to reduce the amount of time spent searching.
		This is a type of search which solves constraint satisfaction problems where, rather than looking for a path, the solution is simply a set of values assigned to a set of variables.
	www.grohol.com /psypsych/Search_algorithm (1009 words)

	N-puzzle - Wikipedia, the free encyclopedia
		The goal of the puzzle is to un-jumble the squares by only making moves which slide squares into the empty space, in turn revealing another empty space in the position of the moved piece.
		The n-puzzle is a classical problem for modelling algorithms involving heuristics.
		Note that both are admissible, i.e., they never overestimate the number of moves left, which ensures optimality for certain search algorithms such as A*.
	en.wikipedia.org /wiki/Fifteen_puzzle (576 words)

	A-star search algorithm : A Star Search Algorithm (Site not responding. Last check: 2007-10-20)
		The A* search algorithm (pronounced "Ay-star") is a tree search algorithm that finds a path from a given initial node to a given goal node.
		The algorithm then searches a closed node list (nodes whose adjoining nodes have been checked) for the same node.
		It uses material from the wikipedia article A-star search algorithm : A Star Search Algorithm.
	www.eurofreehost.com /a_/A_Star_Search_Algorithm.html (547 words)

	Sequence-specific resonance assignment using Tree Search Algorithm (TSA) (Site not responding. Last check: 2007-10-20)
		The Tree Search Algorithm (TSA)[38] was designed to obtain the sequential assignment of protein NMR data based on the spin systems extracted by CPA.
		TSA relies on exhaustive searches over all possible sequential assignments which are satisfied with the protein primary sequence and the "spin-system to amino-acids" table.
		Recalling that the pattern recognition algorithm determines all the possible amino acid candidates of the observed spin systems, a mathematical similarity is calculated for each pair of the mapping between a spin system and an amino acid.
	web.bii.a-star.edu.sg /~kuobin/thesis/html/chapter2/node36.html (1861 words)

	Search (a mode of reasoning)
		Search lecture slides and accompanying transcripts from Professors Tomás Lozano-Pérez and Leslie Kaelbling's Spring 2003 course, Artificial Intelligence.
		Search methods can be divided into systematic and nonsystematic algorithms." From CIRL (The Computational Intelligence Research Laboratory of the University of Oregon).
		Searching for Optimal Solutions: the A* Algorithm, IDA* (A Memory-Efficient Variation of A), and an applet illustrating IDA with sliding-tile puzzles.
	www.aaai.org /AITopics/html/seachreason.html (1191 words)

	Common Text Transformation Library: grammar evaluation
		initiates repeatable search for the leftmost terminal symbol L of the grammar expression R as follows: if L is found, the rest of the components of rule R are matched against the input by the match-evaluation.
		And second, the remaining non-terminal constructs, such as unary operators, adaptors, and quotes, maintain their search transitivity by delegating the search requests to the underlying sub-expressions.
		Search and repeatable search methods of grammar evaluation could use a small subset of grammar to describe particular patterns of search subjects.
	cttl.sourceforge.net /parsing.html (5027 words)

	CIRL Overview -- A* Search (Site not responding. Last check: 2007-10-20)
		A* (pronounced "A star") is a well known and well studied best-first search algorithm.
		A* typically searches outward from the starting node until it reaches the goal node, always expanding the current fringe node that looks like it is along the best path from the start node to the goal node.
		Most A* work has assumed that the cost of evaluating an edge in the search graph is negligible, and that the primary goal is to expand as few nodes as possible.
	www.cirl.uoregon.edu /research/mpastar.html (573 words)

	Navigation (Henry Spencer; Mary Shafer)
		Of course which stars it sees varies, but the aircrew has told me that three is usual on the ground.
		The star map has 61 stars in it and needs to be updated every fifteen months for maximum accuracy.
		With good tracking and a current map, the probably radial error for the star tracker is 0.3 nmi using rapid alignment as part of the preflight checklist and 1.25 nmi after two fixpoints (about 1 hr) following airstart alignment as part of a scramble takeoff.
	yarchive.net /space/spacecraft/navigation.html (1231 words)

	A Star Search Algorithm
		Someone moved this from A Star Search algorithm, but it should be located at A Star search algorithm since "Star" is part of the title.
		A-Star The (pronounced ``ay star'') search algorithm is a variant of dynamic programming that tries to reduce the not provide any helpful information to the algorithm.
		STAR - an algorithm to Search for Tandem Approximate Repeats Please cite this paper if you use the STAR software in your own publications.
	www.education-411.com /find/a-star-search-algorithm.html (472 words)

	Justin Heyes-Jones personal web pages - A* Tutorial
		State space search, then, is solving a problem by beginning with the start state, and then for each node we expand all the nodes beneath it in the graph by applying all the possible moves that can be made at each point.
		When the algorithm begins the start state is placed on the open list, it is the only state we know about and we have not expanded it.
		Any graph search algorithm is said to be admissible if it always returns an optimal soution, that is the one with the lowest cost, if a solution exists at all.
	www.geocities.com /jheyesjones/astar.html (3510 words)

	Best-first search -- Facts, Info, and Encyclopedia article (Site not responding. Last check: 2007-10-20)
		Best-first search is a (Click link for more info and facts about search algorithm) search algorithm which optimises (Click link for more info and facts about depth-first search) depth-first search by expanding the most promising node chosen according to some rule.
		Examples of best-first search algorithms include (Click link for more info and facts about Dijkstra's algorithm) Dijkstra's algorithm and the (Click link for more info and facts about A-star search algorithm) A-star search algorithm.
		Best-first algorithms are often used for pathfinding in (Click link for more info and facts about combinatorial search) combinatorial search.
	www.absoluteastronomy.com /encyclopedia/b/be/best-first_search.htm (216 words)

	ht://Dig: Configuration file attributes
		When stars are used to display the score of a match, this value determines the maximum number of stars that can be displayed.
		This specifies the URL to use to display a blank of the same size as the star defined in the star_image attribute or in the star_patterns attribute.
		The display of stars can be turned on or off with the use_star_image attribute and the maximum number of stars that can be displayed is determined by the max_stars attribute.
	www.htdig.org /attrs.html (8982 words)

	A-star Search Algorithm Encyclopedia Article, Definition, History, Biography (Site not responding. Last check: 2007-10-20)
		Looking For a star search algorithm - Find a star search algorithm and more at Lycos Search.
		Find a star search algorithm - Your relevant result is a click away!
		Look for a star search algorithm - Find a star search algorithm at one of the best sites the Internet has to offer!
	www.karr.net /search/encyclopedia/A-star_search_algorithm (1508 words)

	Puzzle8 - Artificial Intelligence Test
		It means that an exact description of the problems are possible, and all the factors that affects the problem are known (there is no need to worry about unpredictable factors such as weather or terrain).
		The 8-puzzle, along with chess, tic-tac-toe, and backgammon, has been used to study new search algorithms, neural-network, and path-finding.
		It's usually one of the first instrument that computer-scientists use to test a new search algorithm.
	www.permadi.com /java/puzzle8 (275 words)

	A-star search algorithm
		The A* search algorithm\ (pronounced "ay star") is a graph search algorithm that finds a path from a given initial node to a given goal node (or one passing a given goal test).
		It employs a "heuristic estimate" which ranks each node by an estimate of the best route that goes through that node.
		Note that if this estimate simply always returns zero, then A* will effectively perform Dijkstra's algorithm and still find an optimal solution, albeit not as quickly.
	www.brainyencyclopedia.com /encyclopedia/a/a_/a_star_search_algorithm.html (569 words)

	Bill Byrne's Publications: Articles followed by conference papers
		The resulting algorithm is shown to be closely related to gradient descent Boltzmann machine learning rules, and the close relationship of both to the EM algorithm is described.
		The search speed is comparable to the N-best list rescoring procedure which is much more restrictive in the amount of hypotheses considered for search and produces slightly inferior results (0.5-0.6% absolute improvement).
		An algorithm to alleviate this problem is derived within the information geometric framework of Csiszár and Tusnády, and is used to improve MLLR adaptation on NAB and Switchboard adaptation tasks.
	www.clsp.jhu.edu /people/byrne/byrne.html (8378 words)

	Common Text Transformation Library: Templatextl_opunarplus class Reference
		Implements grammar evaluation method for Kleene star match algorithm, starting at the upper boundary of the parseable universe.
		Implements grammar evaluation method for Kleene star search algorithm, starting at the upper boundary of the parseable universe.
		Implements grammar evaluation method for Kleene star repeatable search algorithm, starting at the upper boundary of the parseable universe.
	cttl.sourceforge.net /classcttl__impl_1_1xtl__opunarplus.html (410 words)

	A-Star Algorithm (Site not responding. Last check: 2007-10-20)
		From my own experience, I would absolutely say the algorithm to try is the A* (pronounced "A-star") algorithm.
		If your heuristic estimate function is on the average not very close to the true remaining cost of the path, then A* ends up being close to a full breadth-first search.
		The Encyclopedia mentioned above discusses the beam search and IDA; Sedgewick's Algorithms* in C++ has a good discussion of various data structures for representing priority queues, and their tradeoffs.
	www-cs-students.stanford.edu /~amitp/Articles/AStar1.html (292 words)

	[No title] (Site not responding. Last check: 2007-10-20)
		CSW 4701- Artificial Intelligence A* Search ALGORITHM The A* (Ordered-) SEARCH seen today in class searches for the MINIMAL COST PATH from the initial node to the goal node(s) using BOTH the ghat value and the hhat value.
		Since we are searching for the minimum cost solution path ;over all possible solution paths, someone has to provide us with the COST function as part of the problem definition.
		Remember that we needed 4.2 in the uniform cost search algorithm in the case we find a better way to get to a node that has not yet been expanded.
	www.cs.columbia.edu /~sal/notes/search-A-star.txt (629 words)

	Google Changes to Search Algorithm Having a Ripple Effect
		MSN previewed its proprietary search algorithm in July 2004, and is expected to roll it out soon.
		Using jux2, theylearned that search engines are more different than people think, typically sharing fewer than 3.5 of their top 10 results (see the other statistical data).
		Their hope is that the community of advanced search users finds jux2 an interesting and useful tool.
	www.stargeek.com /item/35369.html (2351 words)

	Amit's A* Pages (Site not responding. Last check: 2007-10-20)
		At one extreme, a sophisticated pathfinder coupled with a trivial movement algorithm would find a path when the object begins to move and the object would follow that path, oblivious to everything else.
		At the other extreme, a movement-only system would not look ahead to find a path (instead, the initial "path" would be a straight line), but instead take one step at a time, considering the local environment at every point.
		Best results are achieved by using both pathfinding and movement algorithms.
	theory.stanford.edu /~amitp/GameProgramming (161 words)

	Google counters search-fix lawsuit \| Tech News on ZDNet (Site not responding. Last check: 2007-10-20)
		Search King filed a lawsuit against Google in late October, alleging it unfairly removed its Web addresses from top search rankings, causing financial losses.
		Search King sought a preliminary injunction against Google, one of the most popular sites in the world, asking to be restored to its previous ranking and to be awarded $75,000 in damages.
		PageRank is a factor that bases a site's importance in search results on the popularity the site has in the Web community.
	news.zdnet.com /2100-1009_22-980215.html (696 words)

	Energy Citations Database (ECD) - Energy and Energy-Related Bibliographic Citations (Site not responding. Last check: 2007-10-20)
		A flat search is implemented by constructing a single discrete grid of densely populated template waveforms spanning the dynamical parameters--masses, spins--which are correlated with the interferometer data.
		Mohanty and Dhurandhar showed that a significant reduction in computational resources can be accomplished by using a hierarchy of such template banks where candidate events triggered by a sparsely populated grid are followed up by the regular, dense flat-search grid.
		In this paper we report an improved implementation of the hierarchical search, wherein we extend the domain of hierarchy to an extra dimension--namely, the time of arrival of the signal in the bandwidth of the interferometer.
	www.osti.gov /energycitations/product.biblio.jsp?osti_id=20509915 (482 words)

	SOS - Cannon Fodder clone (Site not responding. Last check: 2007-10-20)
		A* [A star] algortim - uses a priority queue
		Most notably it features an implementation of the A* [A star] algorithm using a priority queue.
		Each tile is assigned a cost value which is used when the A* algorithm is run.
	www.3dcoder.com /SOS.htm (64 words)

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