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# Topic: Finite state machine

###### In the News (Thu 18 Apr 19)

 AutoFSM - Automated Finite State Machine Finite state machines can be constructed in a variety of ways. Here is the list of attributes that various flavors of software finite state machines may have. The finite state machine may be either the master, driving the other parts of the program, or act as a subroutine keeping track of state between calls. autogen.sourceforge.net /autofsm.html   (573 words)

 Finite state machine Finite state machines are studied in automata theory, a subfield of theoretical computer science. Finite automata may operate on languages of finite words (the standard case), infinite words (Rabin automata, Büchi automata[?]), or various types of trees (tree automata), to name the most important cases. Apart from theory, finite state machines occur also in hardware circuits, where the input, the state and the output are bit vectors of fixed size (Moore and Mealy machines). www.ebroadcast.com.au /lookup/encyclopedia/fs/FSM.html   (830 words)

 Finite State Machine Minimization Finite state machines are best thought of as pattern recognizers, and minimum-size machines correspond to recognizers that require less time and space. Finite state machines are best thought of as edge-labeled directed graphs, where each vertex represents one of n states and each edge a transition from one state to the other on receipt of the alphabet symbol that labels the edge. Finite state machines are often used to specify search patterns in the guise of regular expressions, which are patterns formed by and-ing, or-ing, and looping over smaller regular expressions. www2.toki.or.id /book/AlgDesignManual/BOOK/BOOK5/NODE207.HTM   (1255 words)

 finite state machine - a definition from Whatis.com   (Site not responding. Last check: ) In general, a state machine is any device that stores the status of something at a given time and can operate on input to change the status and/or cause an action or output to take place for any given change. A computer is basically a state machine and each machine instruction is input that changes one or more states and may cause other actions to take place. The operating system is itself a state and each application that runs begins with some initial state that may change as it begins to handle input. whatis.techtarget.com /definition/0,,sid9_gci213052,00.html   (379 words)

 Finite state machine States are indicated by bubbles; transitions between states by arrows. Entries in the table indicate the next state that is reached when the event indicated by the column heading occurs during the state indicated by the row heading. State transition tables are often very sparse: most of the entries are empty "nothing changes" cells that make the tables large and difficult to read. staff.washington.edu /~jon/z/fsm.html   (623 words)

 ASPN : Python Cookbook : Finite State Machine (FSM)   (Site not responding. Last check: ) FSMs are the foundation of scanners, parsers, and regular expressions. FSMs are used to model real world systems such as network protocols, synchronous machines such as a Mr. This FSM may not be the most efficient, but it's fine for small parsing and finite state machine jobs. aspn.activestate.com /ASPN/Cookbook/Python/Recipe/146262   (1693 words)

 Finite State Machine Class   (Site not responding. Last check: ) It takes in a file which defines a state machine for a digital door lock, and then if the file is valid it simulates the doorlock. The machine starts in state 0 and continues reading input until it passes into state 9 at which point it will terminate with the message door opens. where tabfile is the name of your state machine table file, and the -V option causes the program to run in verbose mode, printing out the state transition table and identifying each transition made as it runs. www.dcs.gla.ac.uk /~wpc/Pldi3/fsm/fsm.htm   (314 words)

 Finite State Machine Specification   (Site not responding. Last check: ) Following operations are supported: store to file, load from file, add state, remove state, add transition, remove transition, add event to input alphabet, remove event from input alphabet, add event to output alphabet, remove event from output alphabet, set the current state. State represents a state in the Mealy machine. The abstract state space of consists of the source state and the destination state and the input and output letters. www.cs.virginia.edu /~drl7x/se2/statespec.html   (337 words)

 Gamasutra - Features - "Visual Finite State Machine AI Systems" A visual state machine system is a solution to designer-created AI problems that I've had in the past. The FSM stencil is a document maintained by the programmer and created to define the shapes which designers will be using in their diagrams. The table should be a 2D array that is an equivalent model of the state machine and is suitable for processing in code. www.gamasutra.com /features/20041118/gill_01.shtml   (2150 words)

 perl.com: Building a Finite State Machine Using DFA::Simple A finite state machine is a set of states, one of which is the starting state. It is a finite state machine attached to a tape with potentially infinite capacity. The machine tests the transitions of the current state in sequence until a condition returns true or is undefined. www.perl.com /pub/a/2004/09/23/fsms.html   (1932 words)

 Finite State Machine Finite state machines find practical application in lexical analyzers and parsers, where they may have tens or even hundreds of states. FSMs cannot handle context-free grammars; virtually all high-level languages have a grammar which (ignoring semantic actions) is context-free. In theory, a computer is a finite state machine where the state space is the total possible configurations of memory. c2.com /cgi/wiki?FiniteStateMachine   (535 words)

 generation5 - Finite State Machine Tutorial The state table is left incomplete as the number of events and actions are quite large, but there should be enough presented to illustrate the idea. Its sole purpose is to function as a controller between states and execute the necessary state actions based on the events passed to it. Finite State Machines are widely used in video games to supplement AI given its easy structure and maintenance. www.generation5.org /content/2003/FSM_Tutorial.asp   (1785 words)

 Finite state machine - Wikipedia If, when it has finished readin, it is in an accepting state, it is said to accept the string, otherwise it is said to reject the string. FSMs can only recognize regular languages, and hence they are less computationally powerful than Turing machines - there are decideable problems that are not computable using a FSM. A finite state machine can be implemented in software with a state transition matrix (in some cases a sparse matrix implemented with linkedd lists or a huge switch-statement for detecting the internal state and then individual switch statements for decoding the input symbol. condor.depaul.edu /~ichu/csc415/notes/notes10/fsa.htm   (696 words)

 Finite State Machines (FSM) Finite state machine is a technique I have been hearing about for some time, probably since I first got interested in first person shooter (FPS) computer games. Finite state machines are said to have been "so widely used" and "so simple", yet they have not been covered in my course so far in programming or artificial intelligence subjects. This essay is the product of my research on the topic of finite state machines in the context of artificial intelligence as a control technique, and through that research my goal was to learn something and through writing this essay hopefully be able to teach something. ai-depot.com /FiniteStateMachines   (449 words)

 Finite state machine - Wikipedia, the free encyclopedia A finite state machine (FSM) or finite state automaton (plural: automata) is a model of behavior composed of states, transitions and actions. In addition to their use in modeling reactive systems presented here, finite state automata are significant in many different areas, including electrical engineering, linguistics, computer science, philosophy, biology, mathematics, and logic. Finite state machines are a class of automata studied in automata theory and the theory of computation. en.wikipedia.org /wiki/Finite_state_machine   (2011 words)

 Finite State Technology A finite-state machine (fsm) consists of a finite number of states and a function that determines transitions from one state to another as symbols are read from an input tape. An fsm is often depicted in a state-transition diagram where circles representing the states are connected by arcs that denote the transitions. When it reaches a final state and the end of the input, the string produced on the second tape is taken to be the output that the input string is mapped to. cslu.cse.ogi.edu /HLTsurvey/ch11node8.html   (1512 words)

 STAGES OF FINITE STATE MACHINE DESIGN. When the machine is already available as a table or a set of 4-tuples (3-tuples for Moore machines), the systems apply one of two approaches, a simple one or the advanced one. State symbols are replaced with codes of states and the state table is rewritten to the truth table format for D type flip-flops. Many other FSM analysis methods have been theoretically investigated [114], and some of them were implemented in the academic environment, but industrial systems do not yet incorporate these methods. web.cecs.pdx.edu /~mperkows/=FSM/finite-sm/node3.html   (641 words)

 Finite State Machine In this case 1 is the starting state, a is the transition element and 2 is the ending state. The accepting states are stored in a linked list to allow for any number of states, and for optimal memory usage. The number and name of states are implicitly defined by the rules that the user enters, and are not asked to be defined separately by the user. www.omlettesoft.com /document.php3?did=113   (286 words)

 Liemur - Article - Finite State Machine Upon receipt of a valid set of bytes the state changes to a parse state, where bytes of the packet are processed and stored into a holding buffer until the end of the packet is received. The current state need to be able to determine if the conditions have been met to the transition to the next state. Also states have optional entry and exit action objects that would be called when transitioning to or from the state. www.liemur.com /Articles/FiniteStateMachine.html   (936 words)

 Example of a Mealy Machine: string recognizer   (Site not responding. Last check: ) When the machine is in the state S3 the output will go high after the arrival of a "1" at the input. Thus the output is associated with the transitions as indicated on the state diagram. Comparing this output with the one obtained for a Moore machine of the same sequence detector may let a casual observer think that there is a timing problem as the output seems to asserts already after the "101" input sequence. www.seas.upenn.edu /ese/rca/software/abel/abel.ex1.html   (613 words)

 Finite State Machine The same facilities for creating or modifying machines are available as in other web pages of this set, so it is possible to modify the samples as you feel appropriate. A FSM in which the language recognized is composed of strings that start and finish with O and may contain any string formed from the set {0,1} between. A machine in which the language recognized is composed of binary strings of length 4. courses.cs.vt.edu /~cs1104/FSM/FSM.Samples.html   (185 words)

 Finite State Machine Patterns   (Site not responding. Last check: ) Finite state machines (FSM) are widely used in many reactive systems to describe the dynamic behavior of an object based on its state. A basic design pattern for finite state machines is presented, its design evolves from the general understanding of state machines functionality. Since finite state machines are frequently applicable to areas of concurrent and real-time software, thus it is useful for the system designer to search a catalog of classified state machine patterns. www.csee.wvu.edu /~ammar/EuroPLoP98.htm   (169 words)

 Managing the MIDlet Life-Cycle with a Finite State Machine A state is a condition of the state machine at a certain time. The state machine begins in the start state, and the transition function moves it from one state to the next based on two factors: the current state of the FSM and an input symbol to the transition function: The FSM enables the MIDlet to handle the paused state properly, such as when incoming calls are received, or the destroyed state, such as when the user has exited the application inadvertently. developers.sun.com /techtopics/mobility/midp/articles/fsm/index.html   (2172 words)

 Finite State Machine (Moore) example: string detector   (Site not responding. Last check: ) The machine will keep checking for the proper bit sequence and does not reset to the initial state after it has recognized the string. Figure 1: State diagram, describing the sequence detector implemented as a Moore machine. The number in italics underneath the states indicate which part of the sequence the state remembers. www.seas.upenn.edu /ese/rca/software/abel/abel.ex2.html   (236 words)

 12.7 Finite-State Machine Synthesis   (Site not responding. Last check: ) Omit any special synthesis directives and let the logic synthesizer operate on the state machine as though it were random logic. The FSM output (renamed from yOut to yout_smo by the software) is taken from the output of the three-input NAND gate that decodes the outputs from the flip-flops in the state register. This is useful for FSMs that are required to produce outputs as soon as possible after the active clock edge (in PCI bus controllers, for example). www-ee.eng.hawaii.edu /~msmith/ASICs/HTML/Book2/CH12/CH12.7.htm   (1305 words)

 StateWORKS -> Publications -> Technical Notes A Flowchart is not a State Machine - a concept of a finite state machines is the strongest idea in the design of a software control flow a parser is a specific type of a finite state machine www.stateworks.com /active/content/en/technology/technical_notes.php   (344 words)

 FSM simulator The states are distributed at random on the screen and you can drag them with the mouse to any location in the fl area, Figure 5. The FSM simulator also allows you to introduce a "New Input," which is selected under "Options" on the menu bar, and to "Restart" the machine with the same input, which is selected under "Machine" on the menu bar. The states of this DFA are subsets of states of the NFA. www.cs.binghamton.edu /~software/fsm/fsmdoc.html   (2047 words)

 Finite State Machine Optimization   (Site not responding. Last check: ) State reduction identifies and combines states that have equivalent "behavior." Two states have equivalent behavior if, for all input combinations, their outputs are the same and they change to the same or equivalent next states. Because this finite state machine recognizes finite length strings, we can place an upper bound on the number of states needed to recognize any particular binary string of length four. The implication chart for the state transition table of Figure 9.8 is given in Figure 9.18. www.mathsociety.com /cld/chapter9/chapter09.doc2.html   (2076 words)

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