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Loose Change | beats loose change featured music dj skooly dylan averys roommate dustin marshall along marshalls friends work josue guadalupe swae da ricanstrukta nick hernandez nick tha da.beats loose change also included vocals film.the loose change nd edition dvd release optional musiconly vocalsonly features film.beats loose change beats loose change featured music loose change final cut rare album release featured new music primary focus hiphop score.also full submitted rock rap tracks.another gapless album also noted beats loose change loose change rd edition soundtrack. |
Loose Change | album also included key quotes narration used film.track opinions also original beats loose change saw.also track hani hanjour may share title track beats loose change complete different melody.the loose change final cut dvd release also optional musiconly vocalsonly features film.loose change american coup—official soundtrack original music revision loose change american coup composed mic cartier.june official soundtrack movie released cd baby subsequently streaming websites. |
Pranayama | media film director david lynch interviewed dutch television loose change said film made look thought saw questions ... answers.in book american conspiracies specifically chapter really happened september former governor minnesota jesse ventura wrote urged everyone see documentary loose change.version ventura saw final cut wrote film amazed many firefighters eyewitnesses talked whole series explosions collapse buildings.in film writer director kevin smith stated loved loose change said compelling watch.smith said loose change gripping wellmade film excellent filmmaking said know true.see also truth movement press trutharchitects engineers truthworld trade center controlled demolition conspiracy theories references external links official websitesanskrit prana means vital life force yama means gain control.yoga breath associated prana thus pranayama means elevate prana shakti life energies.pranayama described hindu texts like bhagavad gita yoga sutras patanjali.later hatha yoga texts meant complete suspension breathing.etymology prāṇāyāma devanagari प्राणायाम prāṇāyāma sanskrit compound. |
Pranayama | defined variously different authors.macdonell gives etymology prana prāṇa breath āyāma defines suspension breath.monierwilliams defines compound prāṇāyāma three breathexercises performed saṃdhyā see pūrak rechak english retch throw kumbhak.technical definition refers particular system breath control three processes explained bhattacharyya pūrak take breath inside kumbhak retain rechak discharge it.processes prāṇāyāma besides threestep model.v.s. aptes definition āyāmaḥ derives ā yām provides several variant meanings used compounds.first three meanings length expansion extension stretching extending specific case use compound prāṇāyāma defines āyāmaḥ meaning restrain control stopping.ramamurti mishra gives definitionexpansion individual energy cosmic energy called prāṇāyāma prāṇa energy ayām expansion. |
Pranayama | hinduism bhagavad gītā pranayama mentioned verse .bhagavad gītā.yoga sutras patanjali pranayama fourth limb eight limbs ashtanga yoga mentioned verse .yoga sutras patanjali.patanjali hindu rishi discusses specific approach pranayama verses . |
Pranayama | .devotes verses ..explaining benefits practice.patanjali fully elucidate nature prana theory practice pranayama seem undergone significant development him. |
Pranayama | presents pranayama essentially exercise preliminary concentration.yoga teachers including b. k. s. iyengar advised pranayama part overall practice includes limbs patanjalis raja yoga teachings especially yama niyama asana.hatha yoga indian tradition hatha yoga makes use various pranayama techniques.th century hatha yoga pradipika key text tradition includes various forms pranayama kumbhaka breath retention various body locks bandha.forms pranayama breathing include ujjayi breath victorious breath bhastrika bellows breath kapalabhati skullshining breath shatkarma purification surya bhedana sunpiercing breath soothing bhramari buzzing like bee.b.k. s. iyengar cautions pranayama undertaken one firmly established yoga practice guidance experienced guru.according scholarpractitioner yoga theos bernard ultimate aim pranayama suspension breathing kevala kumbhaka causing mind swoon. |
Pranayama | paramahansa yogananda writes real meaning pranayama according patanjali founder yoga philosophy gradual cessation breathing discontinuance inhalation exhalation.yoga exercise yoga scholar andrea jain states pranayama marginal widely cited sources th century breathing practices dramatically unlike modern ones writes pranayama modern yoga exercise consists synchronising breath movements asanas texts like bhagavad gita yoga sutras patanjali pranayama meant complete cessation breathing cites bronkhorst .buddhism according pali buddhist canon buddha prior enlightenment practiced meditative technique involved pressing palate tongue forcibly attempting restrain breath.described extremely painful conducive enlightenment.buddhist teachings metaphors breathing said stop fourth jhana though sideeffect technique come result purposeful effort.the buddha incorporate moderate modulation length breath part preliminary tetrad anapanasati sutta. |
Pranayama | use preparation concentration.according commentarial literature appropriate beginners.indotibetan tradition later indotibetan developments buddhist pranayama similar hindu forms seen early th century buddhist text titled amṛtasiddhi teaches three bandhas connection yogic breathing kumbakha.tibetan buddhist breathing exercises nine breathings purification ninefold expulsion stale vital energy rlung ro dgu shrugs form alternate nostril breathing commonly include visualizations.nyingma tradition dzogchen practices collected textual cycle known oral transmission vairotsana vai ro snyan brgyud.medical benefits pranayama practice controlled breathing found part many types yogas. |
Pranayama | practice believed help encourage relaxation improve breathing.although limited nature research studies small group subjects indicate pranayama positive impact lung function lung parameter adjunctive treatment.long term large scale studies would needed order validate research confirm effects pranayama reach global acceptance.effectiveness cochrane systematic review symptomatic relief mild moderate asthma breathing exercises stated limited evidence might bring improvement quality life hyperventilation symptoms lung function.study proves regular practice pranayama helps decrease stress also improve sleep quality simultaneously. |
Pranayama | risks although relatively safe hatha yoga risk free.beginners avoid advanced moves exercise within capabilities.functional limitations taken consideration.according least one study pranayama yoga practice leading injuries four injuries study practitioners.limited reports adverse effects including haematoma pneumothorax though connections always well established. |
Pranayama | see also pranahuti references sources bhattacharyya narendra nath .history tantric religion second ed.. delhi manohar publications.isbn .flood gavin d. .introduction hinduism.cambridge university press.macdonell arthur anthony . |
Pranayama | practical sanskrit dictionary.munshiram monoharlal publishers.isbn .mishra ramamurti.fundamentals yoga.baba bhagavandas publication trust.taimni i. k. . |
Pranayama | science yoga eighth reprint ed.. adyar india theosophical publishing house.isbn .zaccaro andrea et al..breathcontrol change life systematic review psychophysiological correlates slow breathing.frontiers human neuroscience. |
Numerical control | cnc machine processes piece material metal plastic wood ceramic composite meet specifications following coded programmed instructions without manual operator directly controlling machining operation.a cnc machine motorized maneuverable tool often motorized maneuverable platform controlled computer according specific input instructions.instructions delivered cnc machine form sequential program machine control instructions gcode mcode executed.program written person far often generated graphical computeraided design cad computeraided manufacturing cam software.case printers part printed sliced instructions program generated.printers also use gcode.cnc vast improvement noncomputerized machining must manually controlled e.g. |
Numerical control | using devices hand wheels levers mechanically controlled prefabricated pattern guides see pantograph mill.modern cnc systems design mechanical part manufacturing program highly automated.parts mechanical dimensions defined using cad software translated manufacturing directives computeraided manufacturing cam software.resulting directives transformed post processor software specific commands necessary particular machine produce component loaded cnc machine.since particular component might require use number different tools – drills saws etc.– modern machines often combine multiple tools single cell. |
Numerical control | installations number different machines used external controller human robotic operators move component machine machine.either case series steps needed produce part highly automated produces part closely matches original cad drawing.description motion controlling multiple axes normally least two x tool spindle moves z depth.position tool driven directdrive stepper motors servo motors order provide highly accurate movements older designs motors series stepdown gears.openloop control works long forces kept small enough speeds great. |
Numerical control | commercial metalworking machines closedloop controls standard required order provide accuracy speed repeatability demanded.parts description controller hardware evolved mills also evolved.one change enclose entire mechanism large box safety measure often additional safety interlocks ensure operator far enough working piece safe operation.new cnc systems built today electronically controlled.cnclike systems used process described movements operations.include laser cutting welding friction stir welding ultrasonic welding flame plasma cutting bending spinning holepunching pinning gluing fabric cutting sewing tape fiber placement routing picking placing sawing. |
Numerical control | history first nc machines built based existing tools modified motors moved tool part follow points fed system punched tape.early servomechanisms rapidly augmented analog digital computers creating modern cnc machine tools revolutionized machining processes.examples cnc machines cnc tools many tools cnc variants including tool machine crashing cnc crash occurs machine moves way harmful machine tools parts machined sometimes resulting bending breakage cutting tools accessory clamps vises fixtures causing damage machine bending guide rails breaking drive screws causing structural components crack deform strain.mild crash may damage machine tools may damage part machined must scrapped.many cnc tools inherent sense absolute position table tools turned on. |
Numerical control | must manually homed zeroed reference work limits figuring location part work really sort hard motion limit mechanism.often possible drive machine outside physical bounds drive mechanism resulting collision damage drive mechanism.many machines implement control parameters limiting axis motion past certain limit addition physical limit switches.however parameters often changed operator.many cnc tools also know anything working environment.machines may load sensing systems spindle axis drives not. |
Numerical control | blindly follow machining code provided operator detect crash either occurring occur operator manually abort active process.machines equipped load sensors stop axis spindle movement response overload condition prevent crash occurring.may limit damage resulting crash.crashes may ever overload axis spindle drives.if drive system weaker machines structural integrity drive system simply pushes obstruction drive motors slip place.machine tool may detect collision slipping example tool mm xaxis fact mm hit obstruction kept slipping. |
Numerical control | next tool motions −mm xaxis future motions invalid may result collisions clamps vises machine itself.common openloop stepper systems possible closedloop systems unless mechanical slippage motor drive mechanism occurred.instead closedloop system machine continue attempt move load either drive motor goes overload condition servo motor fails get desired position.collision detection avoidance possible use absolute position sensors optical encoder strips disks verify motion occurred torque sensors powerdraw sensors drive system detect abnormal strain machine moving cutting common component hobby cnc tools.instead hobby cnc tools simply rely assumed accuracy stepper motors rotate specific number degrees response magnetic field changes.often assumed stepper perfectly accurate never missteps tool position monitoring simply involves counting number pulses sent stepper time. |
Numerical control | alternate means stepper position monitoring usually available crash slip detection possible.commercial cnc metalworking machines use closedloop feedback controls axis movement.closedloop system controller monitors actual position axis absolute incremental encoder.proper control programming reduce possibility crash still operator programmer ensure machine operated safe manner.however software machining simulation maturing rapidly longer uncommon entire machine tool envelope including axes spindles chucks turrets tool holders tailstocks fixtures clamps stock modeled accurately solid models allows simulation software predict fairly accurately whether cycle involve crash.although simulation new accuracy market penetration changing considerably computing advancements. |
Numerical control | numerical precision equipment backlash within numerical systems cnc programming possible code generator assume controlled mechanism always perfectly accurate precision tolerances identical cutting movement directions.always true condition cnc tools.cnc tools large amount mechanical backlash still highly precise drive cutting mechanism driven apply cutting force one direction driving systems pressed tightly together one cutting direction.however cnc device high backlash dull cutting tool lead cutter chatter possible workpiece gouging.backlash also affects precision operations involving axis movement reversals cutting milling circle axis motion sinusoidal. |
Numerical control | however compensated amount backlash precisely known linear encoders manual measurement.the high backlash mechanism necessarily relied repeatedly precise cutting process reference object precision surface may used zero mechanism tightly applying pressure reference setting zero references following cncencoded motions.similar manual machine tool method clamping micrometer onto reference beam adjusting vernier dial zero using object reference.positioning control system numerical control systems position tool defined set instructions called part program.positioning control handled means either openloop closedloop system.openloop system communication takes place one direction controller motor. |
Numerical control | closedloop system feedback provided controller correct errors position velocity acceleration arise due variations load temperature.openloop systems generally cheaper less accurate.stepper motors used types systems servo motors used closed systems.cartesian coordinates g code positions based threedimensional cartesian coordinate system.system typical plane often seen mathematics graphing. |
Numerical control | system required map machine tool paths kind actions need happen specific coordinate.absolute coordinates generally used commonly machines represent point plane.point set stock material order give starting point home position starting actual machining.coding gcodes gcodes used command specific movements machine machine moves drilling functions.majority gcode programs start percent symbol first line followed numerical name program i.e. |
Numerical control | second line another percent symbol last line program.format gcode letter g followed two three digits example g. gcodes differ slightly mill lathe application exampleg rapid motion positioningg linear interpolation motiong circular interpolation motionclockwiseg circular interpolation motioncounter clockwiseg dwell group millg set offsets group millg circular pocketingclockwiseg circular pocketingcounter clockwise mcodes code miscellaneous functions mcode.mcodes miscellaneous machine commands command axis motion.format mcode letter followed two three digits examplem end programm start spindle clockwisem start spindle counter clockwisem stop spindlem tool changem coolant mist coolantm flood coolant onm coolant offm chuck openm chuck closem mm spindle clockwise rotation flood coolantm mm spindle counter clockwise rotation flood coolantm special tool callm spindle orientatem dnc mode program reset rewindm door openm door closem spindle gear middlem low gear selectm high gear selectm retract spindle raises tool spindle current position allow operator whatever would need dom hydraulic chuck closem hydraulic chuck openm tailstock advancingm tailstock reversing example correct speeds feeds program provides efficient smoother product run.incorrect speeds feeds cause damage tool machine spindle even product. |
Numerical control | quickest simplest way find numbers would use calculator found online.formula also used calculate proper speeds feeds material.values found online machinerys handbook.see also automatic tool changerbinary cutter locationcomputeraided technologiescomputeraided engineering caecoordinatemeasuring machine cmmdesign manufacturability cnc machiningdirect numerical control dnceia rseia rsgerber formathome automationmaslow cncmultiaxis machiningpart programroboticswireless dnc references reading brittain james alexanderson pioneer american electrical engineering johns hopkins university press isbn x.holland max machine stopped cautionary tale industrial america boston harvard business school press isbn oclc .noble david f. forces production social history industrial automation new york new york usa knopf isbn lccn .reintjes j. francis numerical control making new technology oxford university press isbn .weisberg david engineering design revolution pdf archived original pdf march .wildes karl l. lindgren nilo a. century electrical engineering computer science mit mit press isbn .herrin golden e. industry honors inventor nc modern machine shop january .siegel arnold.automatic programming numerically controlled machine tools control engineering volume issue october pp. |
Numerical control | –.smid peter cnc programming handbook rd ed.new york industrial press isbn lccn .christopher jun pagarigan vini edmnton alberta canada.cnc infomatic automotive design production.the evolution cnc machines .retrieved october engineering technology groupfitzpatrick michael machining cnc technology.external links media related computer numerical control wikimedia commons |
Mechanical pest control | includes also weeding change temperature control pests.many farmers moment trying find sustainable ways remove pests without harming ecosystem.methods handpicking use human hands remove harmful insects toxic material often common action gardeners.also classified direct quickest way remove clearly visible pests.however also equal disadvantages must performed damage plant done key development insects. |
Mechanical pest control | mechanical traps mechanical traps physical attractants used three main ways efficiently trap insects kill estimate many insects total landmass using sampling method.however traps expensive produce end benefiting insects rather harming them.differences integrated pest control integrated pest control refers use means control pests reach unacceptable levels.mechanical pest control minor part integrated pest control.means use physical means control pests. |
Control freak | see also biological pest controlkaolin spray references external list informationcontrol freak become distressed someone causes deviation way prefer things.control freak also describe person tries make others things way want even people prefer another way even initial person good reason interfering.control freak insinuation allegation someone likely insult damage reputation.implies person’s need control others weakness.this expression first appeared around s. characteristics control freaks tend psychological need charge things people even circumstances cannot controlled.need control extreme cases stem deeper psychological issues obsessive–compulsive disorder ocd anxiety disorders personality disorders.control freaks often perfectionists.may manipulate pressure others change avoid change themselves.control freaks sometimes similarities codependents sense latters fear abandonment leads attempts control dependent on.examples steve jobs steve jobs perfectionist favored closed system control aspects product start finish — termed integrated fragmented approach. |
Controllability | steve wozniak longterm collaborator occasional critic put apple gets playpen keeps there.queen victoria series three documentary programs bbc uk january called queen victorias children argued queen victoria pathological control freak way controlled welfare children.see also referencesexamples control operations incswayamcjjgjjiglude font change rewind transmitting endoftransmission eot control character.references article incorporates public domain material general services administration document federal standard c.exact definition varies slightly within framework type models applied.the following examples variations controllability notions introduced systems control literaturestate controllabilityoutput controllabilitycontrollability behavioural framework state controllability state deterministic system set values systems state variables variables characterized dynamic equations completely describes system given time.particular information past system needed help predicting future states present time known current future values control variables whose values chosen known.complete state controllability simply controllability context given describes ability external input vector control variables move internal state system initial state final state finite time interval.informally define controllability followsif initial state x displaystyle mathbf x final state x f displaystyle mathbf xf exists input sequence transfer system state x displaystyle mathbf x x f displaystyle mathbf xf finite time interval system modeled statespace representation controllable.simplest example continuous lti system row dimension state space expression x ˙ x b u displaystyle dot mathbf x mathbf mathbf x tmathbf b mathbf u determines interval row contributes vector state space system.enough vectors span state space x displaystyle mathbf x system cannot achieve controllability. |
Controllability | may necessary modify displaystyle mathbf b displaystyle mathbf b better approximate underlying differential relationships estimates achieve controllability.controllability mean reached state maintained merely state reached.controllability mean arbitrary paths made state space exists path within prescribed finite time interval.continuous linear systems consider continuous linear system x ˙ x b u displaystyle dot mathbf x tatmathbf x tbtmathbf u c x u .displaystyle mathbf tctmathbf x tdtmathbf u t. exists control u displaystyle u state x displaystyle x time displaystyle state x displaystyle x time displaystyle tt x − ϕ x displaystyle xphi ttx column space w ∫ ϕ b b ϕ displaystyle wttint ttphi ttbtbttphi tttdt ϕ displaystyle phi statetransition matrix w displaystyle wtt controllability gramian.in fact η displaystyle eta solution w η x − ϕ x displaystyle wtteta xphi ttx control given u − b ϕ η displaystyle utbttphi ttteta would make desired transfer.note matrix w displaystyle w defined following properties w displaystyle wtt symmetric w displaystyle wtt positive semidefinite ≥ displaystyle tgeq w displaystyle wtt satisfies linear matrix differential equation w w w − b b w displaystyle frac ddtwttatwttwttattbtbttwtt w displaystyle wtt satisfies equation w w ϕ w ϕ displaystyle wttwttphi ttwttphi ttt rank condition controllability controllability gramian involves integration statetransition matrix system.simpler condition controllability rank condition analogous kalman rank condition timeinvariant systems.consider continuoustime linear system σ displaystyle sigma smoothly varying interval displaystyle tt r displaystyle mathbb r x ˙ x b u displaystyle dot mathbf x tatmathbf x tbtmathbf u c x u . |
Controllability | displaystyle mathbf tctmathbf x tdtmathbf u t. statetransition matrix ϕ displaystyle phi also smooth.introduce n x matrixvalued function ϕ b displaystyle mtphi ttbt define k displaystyle mkt k k k ⩾ displaystyle frac mathrm dk mmathrm tktkgeqslant .consider matrix matrixvalued functions obtained listing columns displaystyle mi … k displaystyle ildots k k … k displaystyle mktleftmtldots mktright .if exists ¯ ∈ displaystyle bar tin tt nonnegative integer k rank k ¯ n displaystyle operatorname rank mkbar tn σ displaystyle sigma controllable.if σ displaystyle sigma also analytically varying interval displaystyle tt σ displaystyle sigma controllable every nontrivial subinterval displaystyle tt exists ¯ ∈ displaystyle bar tin tt nonnegative integer k rank k n displaystyle operatorname rank mktin .the methods still complex check since involves computation statetransition matrix ϕ displaystyle phi .another equivalent condition defined follow.let b b displaystyle btbt ≥ displaystyle igeq define b displaystyle bit b − b .displaystyle atbitfrac mathrm mathrm tbit. |
Controllability | case b displaystyle bi obtained directly data b .displaystyle atbt.system controllable exists ¯ ∈ displaystyle bar tin tt nonnegative integer k displaystyle k rank b ¯ b ¯ … b k ¯ n displaystyle textrm rankleftbbar tbbar tldots bkbar trightn .example consider system varying analytically − ∞ ∞ displaystyle infty infty matrices displaystyle atbeginbmatrixtttendbmatrix b .displaystyle btbeginbmatrixendbmatrix. |
Controllability | b b b b − displaystyle bbbbbeginbmatrixendbmatrix since matrix rank system controllable every nontrivial interval r displaystyle mathbb r .continuous linear timeinvariant lti systems consider continuous linear timeinvariant system x ˙ x b u displaystyle dot mathbf x tamathbf x tbmathbf u c x u displaystyle mathbf tcmathbf x tdmathbf u x displaystyle mathbf x n × displaystyle ntimes state vector displaystyle mathbf × displaystyle mtimes output vector u displaystyle mathbf u r × displaystyle rtimes input control vector displaystyle n × n displaystyle ntimes n state matrix b displaystyle b n × r displaystyle ntimes r input matrix c displaystyle c × n displaystyle mtimes n output matrix displaystyle × r displaystyle mtimes r feedthrough feedforward matrix.the n × n r displaystyle ntimes nr controllability matrix given r b b b ...n − b displaystyle rbeginbmatrixbabab...anbendbmatrix system controllable controllability matrix full row rank i.e. |
Controllability | rank r n displaystyle operatorname rank rn .discrete linear timeinvariant lti systems discretetime linear statespace system i.e.time variable k ∈ z displaystyle kin mathbb z state equation x k x k b u k displaystyle textbf xkatextbf xkbtextbf uk displaystyle n × n displaystyle ntimes n matrix b displaystyle b n × r displaystyle ntimes r matrix i.e.u displaystyle mathbf u r displaystyle r inputs collected r × displaystyle rtimes vector.test controllability n × n r displaystyle ntimes nr matrix c b b b ⋯ n − b displaystyle mathcal cbeginbmatrixbababcdots anbendbmatrix full row rank i.e. |
Controllability | rank c n displaystyle operatorname rank mathcal cn .system controllable c displaystyle mathcal c n displaystyle n columns linearly independent n displaystyle n columns c displaystyle mathcal c linearly independent n displaystyle n states reachable giving system proper inputs variable u k displaystyle uk .derivation given state x displaystyle textbf x initial time arbitrarily denoted k state equation gives x x b u displaystyle textbf xatextbf xbtextbf u x x b u x b u b u displaystyle textbf xatextbf xbtextbf uatextbf xabtextbf ubtextbf u repeated backsubstitutions state variable eventually yielding x n b u n − b u n − ⋯ n − b u n x displaystyle textbf xnbtextbf unabtextbf uncdots anbtextbf uantextbf x equivalently x n − n x b b ⋯ n − b u n − u n − ⋯ u .displaystyle textbf xnantextbf xbabcdots anbtextbf utntextbf utncdots textbf utt.imposing desired value state vector x n displaystyle textbf xn left side always solved stacked vector control vectors matrix matrices beginning right side full row rank. |
Controllability | example example consider case n displaystyle n r displaystyle r i.e.one control input.thus b displaystyle b b displaystyle ab × displaystyle times vectors.b b displaystyle beginbmatrixbabendbmatrix rank full rank b displaystyle b b displaystyle ab linearly independent span entire plane.rank b displaystyle b b displaystyle ab collinear span plane.assume initial state zero.at time k displaystyle k x x b u b u displaystyle xatextbf xbtextbf ubtextbf u time k displaystyle k x x b u b u b u displaystyle xatextbf xbtextbf uabtextbf ubtextbf u time k displaystyle k reachable states line formed vector b displaystyle b .at time k displaystyle k reachable states linear combinations b displaystyle ab b displaystyle b .if system controllable two vectors span entire plane done time k displaystyle k .the assumption made initial state zero merely convenience.clearly states reached origin state reached another state merely shift coordinates.this example holds positive n displaystyle n case n displaystyle n easier visualize. |
Controllability | analogy example n consider analogy previous example system.you sitting car infinite flat plane facing north.the goal reach point plane driving distance straight line come full stop turn driving another distance straight line.if car steering drive straight means drive line case northsouth line since started facing north.the lack steering case would analogous rank c displaystyle c two distances drove line.now car steering could easily drive point plane would analogous case rank c displaystyle c .if change example n displaystyle n analogy would flying space reach position space ignoring orientation aircraft.you allowed tofly straight lineturn left right amount yawdirect plane upwards downwards amount pitchalthough dimensional case harder visualize concept controllability still analogous.nonlinear systems nonlinear systems controlaffine form x ˙ f x ∑ g x u displaystyle dot mathbf x mathbf fx sum immathbf g imathbf x ui locally accessible x displaystyle x accessibility distribution r displaystyle r spans n displaystyle n space n displaystyle n equals rank x displaystyle x r given r g ⋯ g g k g j ⋯ f k g .displaystyle rbeginbmatrixmathbf g cdots mathbf g mmathrm ad mathbf g ikmathbf mathbf g j cdots mathrm ad mathbf f kmathbf mathbf g endbmatrix.f k g displaystyle mathrm ad mathbf f kmathbf mathbf g repeated lie bracket operation defined f k g f ⋯ j ⋯ f g .displaystyle mathrm ad mathbf f kmathbf mathbf g beginbmatrixmathbf f cdots jcdots mathbf mathbf f mathbf g endbmatrix. |
Controllability | controllability matrix linear systems previous section fact derived equation.null controllability discrete control system nullcontrollable means exists controllable u k displaystyle uk x k displaystyle xk initial state x x displaystyle xx .words equivalent condition exists matrix f displaystyle f b f displaystyle abf nilpotent.this easily shown controllableuncontrollable decomposition.output controllability output controllability related notion output system denoted previous equations output controllability describes ability external input move output initial condition final condition finite time interval.necessary relationship state controllability output controllability. |
Controllability | particulara controllable system necessarily output controllable.example matrix matrix c full row rank positions output masked limiting structure output matrix therefore unachievable.moreover even though system moved state finite time may outputs inaccessible states.trivial numerical example uses c matrix least one row zeros thus system able produce nonzero output along dimension.an output controllable system necessarily state controllable.example dimension state space greater dimension output set possible state configurations individual output. |
Controllability | system significant zero dynamics trajectories system observable output.consequently able drive output particular position finite time says nothing state configuration system.for linear continuoustime system like example described matrices displaystyle b displaystyle b c displaystyle c displaystyle × n r displaystyle mtimes nr output controllability matrix c b c b c b ⋯ c n − b displaystyle beginbmatrixcbcabcabcdots canbdendbmatrix full row rank i.e.rank displaystyle system output controllable.controllability input constraints systems limited control authority often longer possible move initial state final state inside controllable subspace.phenomenon caused constraints input could inherent system e.g. |
Controllability | due saturating actuator imposed system reasons e.g.due safetyrelated concerns.controllability systems input state constraints studied context reachability viability theory.controllability behavioral framework socalled behavioral system theoretic approach due willems see people systems control models considered directly define input–output structure.framework systems described admissible trajectories collection variables might interpreted inputs outputs.a system defined controllable setting past part behavior trajectory external variables concatenated future trajectory behavior way concatenation contained behavior i.e. |
Controllability | part admissible system behavior.stabilizability slightly weaker notion controllability stabilizability.system said stabilizable uncontrollable state variables made stable dynamics.thus even though state variables cannot controlled determined controllability test state variables still remain bounded systems behavior.reachable set let ∈ т x ∈ x x set possible states т interval time. |
Controllability | reachable set x time defined r x z ∈ x x → z displaystyle rtxleftzin xxoverset trightarrow zright xt→z denotes exists state transition x z time t.for autonomous systems reachable set given r b b ....n − b displaystyle mathrm im rmathrm im bmathrm im ab....mathrm im anb r controllability matrix.in terms reachable set system controllable r r n displaystyle imrmathbb r n . |
Controllability | proof following equalities r b b ....n − b displaystyle rb ab....anb r b b . |
Controllability | ...n − b displaystyle mathrm im rmathrm im b ab....anb r r n k r displaystyle mathrm dimim rmathrm rank r considering system controllable columns r linearly independent.r n displaystyle mathrm dimim rn r n k r n displaystyle mathrm rank rn r r n ◼ displaystyle mathrm im rmathbb r nquad blacksquare related set reachable set controllable set defined c x z ∈ x z → x displaystyle ctxleftzin xzoverset trightarrow xright .the relation reachability controllability presented sontaga ndimensional discrete linear system controllable r r k x displaystyle rrkx x set possible values states x k time step.b continuoustime linear system controllable r r e x displaystyle rrex e.if c c e x displaystyle ccex e. examplelet system n dimensional discretetimeinvariant system formulaφnw ∑ n − b w n − displaystyle sum limits inaibwn φfinal time initial time state variable restrictions defined transition matrix state variable x initial time final time n restrictions w.it follows future state r k displaystyle rk ⇔ image linear mapimrrab≜ im b b . |
Controllability | ...n − b displaystyle b ab....anb maps u n displaystyle un →xwhen u k displaystyle ukm x k n displaystyle xkn identify rab n nm matrix whose columns columns b b .. |
Controllability | ..n − b displaystyle b ab....anb order.system controllable rank b b .. |
Change management auditing | ..n − b displaystyle b ab....anb n. truth image linear map r x. based r r k x displaystyle rrkx xє r n displaystyle mathbb r n .see also observabilitystate observer notes references external links matlab function checking controllability systemmathematica function checking controllability systemcontrol procedure following features commonly part change management auditing procedurechange management procedures formally documented controlled.changes requested formal process.requests recorded stored reference.the effect requested change assessed.each change assessed based projected effect computer system business operations.assessment documented request.priority based urgency potential benefits ease changes corrected.controls imposed changes.changes limited automated manual controls.particular unauthorized changes periodically searched for.an emergency change process place.policies clearly define emergency changes.generally errors significantly impair system function business operations increase systems vulnerability both.emergency changes override controls. |
Internal control | instance proposed change might documented permitted without authorization.change documentation periodically updated.maintenance tasks changes recorded.controls applied new software releases.for security new software releases often require controls back ups version control secure implementation.software distribution assessed compliance.software distribution assessed compliance license agreements.noncompliance disastrous financial legal results.changes submitted approval.proposed changes submitted approval auditors reviewed required resources changes effect urgency systems stability.duties separatedresponsibility creation approval application assigned different personnel avoid undesired changes.changes reviewed.changes monitored assess efficacy change management policies.see also change managementinformation technology auditinformation technology audit operations references external links international organization standardization isoinformation systems audit control association isacabroad concept internal control involves everything controls risks organization.it means organizations resources directed monitored measured.plays important role detecting preventing fraud protecting organizations resources physical e.g.machinery property intangible e.g.reputation intellectual property trademarks.at organizational level internal control objectives relate reliability financial reporting timely feedback achievement operational strategic goals compliance laws regulations.specific transaction level internal controls refers actions taken achieve specific objective e.g. |
Internal control | ensure organizations payments third parties valid services rendered.internal control procedures reduce process variation leading predictable outcomes.internal control key element foreign corrupt practices act fcpa sarbanes–oxley act required improvements internal control united states public corporations.internal controls within business entities also referred operational controls.main controls place sometimes referred key financial controls kfcs. |
Internal control | internal control comprises plan organisations.early history internal control internal controls existed ancient times.hellenistic egypt dual administration one set bureaucrats charged collecting taxes another supervising them.republic china supervising authority 检察院 pinyin jiǎnchá yùan one five branches government investigatory agency monitors branches government.definitions many definitions internal control affects various constituencies stakeholders organization various ways different levels aggregation.under coso internal controlintegrated framework widely used framework united states around world internal control broadly defined process effected entitys board directors management personnel designed provide reasonable assurance regarding achievement objectives relating operations reporting compliance.coso defines internal control five componentscontrol environmentsets tone organization influencing control consciousness people. |
Internal control | foundation components internal control.risk assessmentthe identification analysis relevant risks achievement objectives forming basis risks managedinformation communicationsystems processes support identification capture exchange information form time frame enable people carry responsibilitiescontrol activitiesthe policies procedures help ensure management directives carried out.monitoringprocesses used assess quality internal control performance time.the coso definition relates aggregate control system organization composed many individual control procedures.discrete control procedures controls defined sec ...a specific set policies procedures activities designed meet objective.control may exist within designated function activity process.control’s impact ... may entitywide specific account balance class transactions application.controls unique characteristics – example automated manual reconciliations segregation duties review approval authorizations safeguarding accountability assets preventing detecting error fraud.controls within process may consist financial reporting controls operational controls designed achieve operational objectives. |
Internal control | context generally setting objectives budgets plans expectations establish criteria control.control exists keep performance state affairs within expected allowed accepted.control built within process internal nature.takes place combination interrelated components – social environment effecting behavior employees information necessary control policies procedures.internal control structure plan determining internal control consists elements.the concepts corporate governance also heavily rely necessity internal controls. |
Internal control | internal controls help ensure processes operate designed risk responses risk treatments risk management carried coso ii.addition needs place circumstances ensuring aforementioned procedures performed intended right attitudes integrity competence monitoring managers.roles responsibilities internal control according coso framework everyone organization responsibility internal control extent.virtually employees produce information used internal control system take actions needed affect control.also personnel responsible communicating upward problems operations noncompliance code conduct policy violations illegal actions. |
Internal control | major entity corporate governance particular role play management chief executive officer top manager organization overall responsibility designing implementing effective internal control.individual chief executive sets tone top affects integrity ethics factors positive control environment.large company chief executive fulfills duty providing leadership direction senior managers reviewing way theyre controlling business.senior managers turn assign responsibility establishment specific internal control policies procedures personnel responsible units functions.smaller entity influence chief executive often ownermanager usually direct. |
Internal control | event cascading responsibility manager effectively chief executive sphere responsibility.particular significance financial officers staffs whose control activities cut across well operating units enterprise.board directors management accountable board directors provides governance guidance oversight.effective board members objective capable inquisitive.also knowledge entitys activities environment commit time necessary fulfil board responsibilities. |
Internal control | management may position override controls ignore stifle communications subordinates enabling dishonest management intentionally misrepresents results cover tracks.strong active board particularly coupled effective upward communications channels capable financial legal internal audit functions often best able identify correct problem.audit roles responsibilities auditors internal auditors external auditors organization also measure effectiveness internal control efforts.assess whether controls properly designed implemented working effectively make recommendations improve internal control.may also review information technology controls relate systems organization. |
Internal control | provide reasonable assurance internal controls involved financial reporting process effective tested external auditor organizations public accountants required opine internal controls company reliability financial reporting.audit committee role responsibilities audit committee general terms discuss management internal external auditors major stakeholders quality adequacy organization’s internal controls system risk management process effectiveness outcomes meet regularly privately director internal audit b review discuss management external auditors approve audited financial statements organization make recommendation regarding inclusion financial statements public filing.also review management independent auditor effect regulatory accounting initiatives well offbalance sheet issues organization’s financial statements c review discuss management types information disclosed types presentations made respect companys earning press release financial information earnings guidance provided analysts rating agencies confirm scope audits performed external internal auditors monitor progress review results review fees expenses.review significant findings unsatisfactory internal audit reports audit problems difficulties encountered external independent auditor.monitor managements response audit findings e manage complaints concerning accounting internal accounting controls auditing matters f receive regular reports chief executive officer chief financial officer companys control committees regarding deficiencies design operation internal controls fraud involves management employees significant role internal controls g support management resolving conflicts interest. |
Internal control | monitor adequacy organization’s internal controls ensure fraud cases acted upon.personnel benefits committee role responsibilities personnel benefits general terms approve oversee administration companys executive compensation program b review approve specific compensation matters chief executive officer chief operating officer applicable chief financial officer general counsel senior human resources officer treasurer director corporate relations management company directors c review appropriate changes compensation matters officers listed board dreview monitor humanresource related performance compliance activities reports including performance management system.also ensure benefitrelated performance measures properly used management organization.operating staff staff members responsible reporting problems operations monitoring improving performance monitoring noncompliance corporate policies various professional codes violations policies standards practices procedures.particular responsibilities documented individual personnel files. |
Internal control | performance management activities take part compliance performance data collection processing activities part various organizational units may also responsible various compliance operationalrelated activities organization.staff junior managers may involved evaluating controls within organizational unit using control selfassessment.continuous controls monitoring advances technology data analysis led development numerous tools automatically evaluate effectiveness internal controls.used conjunction continuous auditing continuous controls monitoring provides assurance financial information flowing business processes.auditing standards laws regulations internal control related financial reporting number jurisdictions.u.s. regulations specifically established sections sarbanesoxley act. |
Internal control | guidance auditing controls specified inssae no.published american institute certified public accountants aicpaauditing standard no.published public company accounting oversight board pcaobsec guidance discussed sox topdown risk assessment.limitations internal control provide reasonable absolute assurance objectives organization met.concept reasonable assurance implies high degree assurance constrained costs benefits establishing incremental control procedures.effective internal control implies organization generates reliable financial reporting substantially complies laws regulations apply it. |
Internal control | however whether organization achieves operational strategic objectives may depend factors outside enterprise competition technological innovation.factors outside scope internal control therefore effective internal control provides timely information feedback progress towards achievement operational strategic objectives cannot guarantee achievement.describing internal controls internal controls may described terms ofa pertinent objective financial statement assertionb nature control activity itself.objective assertions categorization assertions representations management embodied financial statements.example financial statement shows balance worth fixed assets implies management asserts fixed assets actually exist date financial statements valuation worth exactly based historical cost fair value depending reporting framework standards entity complete rightobligation arising assets e.g. |
Internal control | leased must disclosed accordingly.fixed assets must disclosed represented correctly financial statement according financial reporting framework applicable company.controls may defined particular financial statement assertion relate.five assertions forming acronym percv pronounced perceivepresentation disclosure accounts disclosures properly described financial statements organization.existenceoccurrencevalidity valid authorized transactions processed.rights obligations assets rights organization liabilities obligations given date.completeness transactions processed be.valuation transactions valued accurately using proper methodology specified means computation formula.for example validity control objective might payments made authorized products services received.typical control procedure would payable system compares purchase order receiving record vendor invoice prior authorizing payment.management responsible implementing appropriate controls apply transactions areas responsibility. |
Internal control | activity categorization control activities may also explained type nature activity.include limited tosegregation duties – separating authorization custody record keeping roles prevent fraud error one person.authorization transactions – review particular transactions appropriate person.retention records – maintaining documentation substantiate transactions.supervision monitoring operations – observation review ongoing operational activity.physical safeguards – usage cameras locks physical barriers etc.protect property merchandise inventory.toplevel reviews – analysis actual results versus organizational goals plans periodic regular operational reviews metrics key performance indicators kpis.it general controls – controls related security ensure access systems data restricted authorized personnel usage passwords review access logs b change management ensure program code properly controlled separation production test environments system user testing changes prior acceptance controls migration code production.it application controls – controls information processing enforced applications edit checks validate data entry accounting transactions numerical sequences comparing file totals control accounts.control precision control precision describes alignment correlation particular control procedure given control objective risk.control direct impact achievement objective mitigation risk said precise one indirect impact objective risk. |
Internal control | precision distinct sufficiency multiple controls varying degrees precision may involved achieving control objective mitigating risk.precision important factor performing sox topdown risk assessment.identifying specific financial reporting material misstatement risks management external auditors required identify test controls mitigate risks.involves making judgments regarding precision sufficiency controls required mitigate risks.risks controls may entitylevel assertionlevel pcaob guidance.entitylevel controls identified address entitylevel risks.however combination entitylevel assertionlevel controls typically identified address assertionlevel risks.pcaob set forth threelevel hierarchy considering precision entitylevel controls. |
Internal control | later guidance pcaob regarding small public firms provided several factors consider assessing precision.types internal control policies internal control plays important role prevention detection fraud.sarbanesoxley act companies required perform fraud risk assessment assess related controls.typically involves identifying scenarios theft loss could occur determining existing control procedures effectively manage risk acceptable level.risk senior management might override important financial controls manipulate financial reporting also key area focus fraud risk assessment.the aicpa iia acfe also sponsored guide published includes framework helping organizations manage fraud risk. |
Internal control | internal controls process improvement controls evaluated improved make business operation run effectively efficiently.example automating controls manual nature save costs improve transaction processing.internal control system thought executives means preventing fraud complying laws regulations important opportunity may missed.internal controls also used systematically improve businesses particularly regard effectiveness efficiency.types internal control policies business answer send references external links organization supreme audit institutions intosaicommittee sponsoring organizations treadway commission internal control – integrated framework new york state internal control association nysicarafik ouanouki alain april . |
Internal control | process conformance measurement sarbanesoxley requirement pdf.proceedings iwsm mensura .broad concept internal control involves everything controls risks organization.it means organizations resources directed monitored measured.plays important role detecting preventing fraud protecting organizations resources physical e.g.machinery property intangible e.g.reputation intellectual property trademarks.at organizational level internal control objectives relate reliability financial reporting timely feedback achievement operational strategic goals compliance laws regulations.specific transaction level internal controls refers actions taken achieve specific objective e.g. |
Internal control | ensure organizations payments third parties valid services rendered.internal control procedures reduce process variation leading predictable outcomes.internal control key element foreign corrupt practices act fcpa sarbanes–oxley act required improvements internal control united states public corporations.internal controls within business entities also referred operational controls.main controls place sometimes referred key financial controls kfcs. |
Internal control | internal control comprises plan organisations.early history internal control internal controls existed ancient times.hellenistic egypt dual administration one set bureaucrats charged collecting taxes another supervising them.republic china supervising authority 检察院 pinyin jiǎnchá yùan one five branches government investigatory agency monitors branches government.definitions many definitions internal control affects various constituencies stakeholders organization various ways different levels aggregation.under coso internal controlintegrated framework widely used framework united states around world internal control broadly defined process effected entitys board directors management personnel designed provide reasonable assurance regarding achievement objectives relating operations reporting compliance.coso defines internal control five componentscontrol environmentsets tone organization influencing control consciousness people. |
Internal control | foundation components internal control.risk assessmentthe identification analysis relevant risks achievement objectives forming basis risks managedinformation communicationsystems processes support identification capture exchange information form time frame enable people carry responsibilitiescontrol activitiesthe policies procedures help ensure management directives carried out.monitoringprocesses used assess quality internal control performance time.the coso definition relates aggregate control system organization composed many individual control procedures.discrete control procedures controls defined sec ...a specific set policies procedures activities designed meet objective.control may exist within designated function activity process.control’s impact ... may entitywide specific account balance class transactions application.controls unique characteristics – example automated manual reconciliations segregation duties review approval authorizations safeguarding accountability assets preventing detecting error fraud.controls within process may consist financial reporting controls operational controls designed achieve operational objectives. |
Internal control | context generally setting objectives budgets plans expectations establish criteria control.control exists keep performance state affairs within expected allowed accepted.control built within process internal nature.takes place combination interrelated components – social environment effecting behavior employees information necessary control policies procedures.internal control structure plan determining internal control consists elements.the concepts corporate governance also heavily rely necessity internal controls. |
Internal control | internal controls help ensure processes operate designed risk responses risk treatments risk management carried coso ii.addition needs place circumstances ensuring aforementioned procedures performed intended right attitudes integrity competence monitoring managers.roles responsibilities internal control according coso framework everyone organization responsibility internal control extent.virtually employees produce information used internal control system take actions needed affect control.also personnel responsible communicating upward problems operations noncompliance code conduct policy violations illegal actions. |
Internal control | major entity corporate governance particular role play management chief executive officer top manager organization overall responsibility designing implementing effective internal control.individual chief executive sets tone top affects integrity ethics factors positive control environment.large company chief executive fulfills duty providing leadership direction senior managers reviewing way theyre controlling business.senior managers turn assign responsibility establishment specific internal control policies procedures personnel responsible units functions.smaller entity influence chief executive often ownermanager usually direct. |
Internal control | event cascading responsibility manager effectively chief executive sphere responsibility.particular significance financial officers staffs whose control activities cut across well operating units enterprise.board directors management accountable board directors provides governance guidance oversight.effective board members objective capable inquisitive.also knowledge entitys activities environment commit time necessary fulfil board responsibilities. |
Internal control | management may position override controls ignore stifle communications subordinates enabling dishonest management intentionally misrepresents results cover tracks.strong active board particularly coupled effective upward communications channels capable financial legal internal audit functions often best able identify correct problem.audit roles responsibilities auditors internal auditors external auditors organization also measure effectiveness internal control efforts.assess whether controls properly designed implemented working effectively make recommendations improve internal control.may also review information technology controls relate systems organization. |
Internal control | provide reasonable assurance internal controls involved financial reporting process effective tested external auditor organizations public accountants required opine internal controls company reliability financial reporting.audit committee role responsibilities audit committee general terms discuss management internal external auditors major stakeholders quality adequacy organization’s internal controls system risk management process effectiveness outcomes meet regularly privately director internal audit b review discuss management external auditors approve audited financial statements organization make recommendation regarding inclusion financial statements public filing.also review management independent auditor effect regulatory accounting initiatives well offbalance sheet issues organization’s financial statements c review discuss management types information disclosed types presentations made respect companys earning press release financial information earnings guidance provided analysts rating agencies confirm scope audits performed external internal auditors monitor progress review results review fees expenses.review significant findings unsatisfactory internal audit reports audit problems difficulties encountered external independent auditor.monitor managements response audit findings e manage complaints concerning accounting internal accounting controls auditing matters f receive regular reports chief executive officer chief financial officer companys control committees regarding deficiencies design operation internal controls fraud involves management employees significant role internal controls g support management resolving conflicts interest. |
Internal control | monitor adequacy organization’s internal controls ensure fraud cases acted upon.personnel benefits committee role responsibilities personnel benefits general terms approve oversee administration companys executive compensation program b review approve specific compensation matters chief executive officer chief operating officer applicable chief financial officer general counsel senior human resources officer treasurer director corporate relations management company directors c review appropriate changes compensation matters officers listed board dreview monitor humanresource related performance compliance activities reports including performance management system.also ensure benefitrelated performance measures properly used management organization.operating staff staff members responsible reporting problems operations monitoring improving performance monitoring noncompliance corporate policies various professional codes violations policies standards practices procedures.particular responsibilities documented individual personnel files. |
Internal control | performance management activities take part compliance performance data collection processing activities part various organizational units may also responsible various compliance operationalrelated activities organization.staff junior managers may involved evaluating controls within organizational unit using control selfassessment.continuous controls monitoring advances technology data analysis led development numerous tools automatically evaluate effectiveness internal controls.used conjunction continuous auditing continuous controls monitoring provides assurance financial information flowing business processes.auditing standards laws regulations internal control related financial reporting number jurisdictions.u.s. regulations specifically established sections sarbanesoxley act. |
Internal control | guidance auditing controls specified inssae no.published american institute certified public accountants aicpaauditing standard no.published public company accounting oversight board pcaobsec guidance discussed sox topdown risk assessment.limitations internal control provide reasonable absolute assurance objectives organization met.concept reasonable assurance implies high degree assurance constrained costs benefits establishing incremental control procedures.effective internal control implies organization generates reliable financial reporting substantially complies laws regulations apply it. |
Internal control | however whether organization achieves operational strategic objectives may depend factors outside enterprise competition technological innovation.factors outside scope internal control therefore effective internal control provides timely information feedback progress towards achievement operational strategic objectives cannot guarantee achievement.describing internal controls internal controls may described terms ofa pertinent objective financial statement assertionb nature control activity itself.objective assertions categorization assertions representations management embodied financial statements.example financial statement shows balance worth fixed assets implies management asserts fixed assets actually exist date financial statements valuation worth exactly based historical cost fair value depending reporting framework standards entity complete rightobligation arising assets e.g. |
Internal control | leased must disclosed accordingly.fixed assets must disclosed represented correctly financial statement according financial reporting framework applicable company.controls may defined particular financial statement assertion relate.five assertions forming acronym percv pronounced perceivepresentation disclosure accounts disclosures properly described financial statements organization.existenceoccurrencevalidity valid authorized transactions processed.rights obligations assets rights organization liabilities obligations given date.completeness transactions processed be.valuation transactions valued accurately using proper methodology specified means computation formula.for example validity control objective might payments made authorized products services received.typical control procedure would payable system compares purchase order receiving record vendor invoice prior authorizing payment.management responsible implementing appropriate controls apply transactions areas responsibility. |
Internal control | activity categorization control activities may also explained type nature activity.include limited tosegregation duties – separating authorization custody record keeping roles prevent fraud error one person.authorization transactions – review particular transactions appropriate person.retention records – maintaining documentation substantiate transactions.supervision monitoring operations – observation review ongoing operational activity.physical safeguards – usage cameras locks physical barriers etc.protect property merchandise inventory.toplevel reviews – analysis actual results versus organizational goals plans periodic regular operational reviews metrics key performance indicators kpis.it general controls – controls related security ensure access systems data restricted authorized personnel usage passwords review access logs b change management ensure program code properly controlled separation production test environments system user testing changes prior acceptance controls migration code production.it application controls – controls information processing enforced applications edit checks validate data entry accounting transactions numerical sequences comparing file totals control accounts.control precision control precision describes alignment correlation particular control procedure given control objective risk.control direct impact achievement objective mitigation risk said precise one indirect impact objective risk. |
Internal control | precision distinct sufficiency multiple controls varying degrees precision may involved achieving control objective mitigating risk.precision important factor performing sox topdown risk assessment.identifying specific financial reporting material misstatement risks management external auditors required identify test controls mitigate risks.involves making judgments regarding precision sufficiency controls required mitigate risks.risks controls may entitylevel assertionlevel pcaob guidance.entitylevel controls identified address entitylevel risks.however combination entitylevel assertionlevel controls typically identified address assertionlevel risks.pcaob set forth threelevel hierarchy considering precision entitylevel controls. |
Internal control | later guidance pcaob regarding small public firms provided several factors consider assessing precision.types internal control policies internal control plays important role prevention detection fraud.sarbanesoxley act companies required perform fraud risk assessment assess related controls.typically involves identifying scenarios theft loss could occur determining existing control procedures effectively manage risk acceptable level.risk senior management might override important financial controls manipulate financial reporting also key area focus fraud risk assessment.the aicpa iia acfe also sponsored guide published includes framework helping organizations manage fraud risk. |
Internal control | internal controls process improvement controls evaluated improved make business operation run effectively efficiently.example automating controls manual nature save costs improve transaction processing.internal control system thought executives means preventing fraud complying laws regulations important opportunity may missed.internal controls also used systematically improve businesses particularly regard effectiveness efficiency.types internal control policies business answer send references external links organization supreme audit institutions intosaicommittee sponsoring organizations treadway commission internal control – integrated framework new york state internal control association nysicarafik ouanouki alain april . |
Access control | process conformance measurement sarbanesoxley requirement pdf.proceedings iwsm mensura .act accessing may mean consuming entering using.permission access resource called authorization.locks login credentials two analogous mechanisms access control.physical security geographical access control may enforced personnel e.g.border guard bouncer ticket checker device turnstile.may fences avoid circumventing access control. |
Access control | alternative access control strict sense physically controlling access system checking authorized presence see e.g.ticket controller transportation.variant exit control e.g.shop checkout country.the term access control refers practice restricting entrance property building room authorized persons.physical access control achieved human guard bouncer receptionist mechanical means locks keys technological means access control systems like mantrap. |
Access control | within environments physical key management may also employed means managing monitoring access mechanically keyed areas access certain small assets.physical access control matter when.access control system determines allowed enter exit allowed exit enter allowed enter exit.historically partially accomplished keys locks.door locked someone key enter door depending lock configured.mechanical locks keys allow restriction key holder specific times dates. |
Access control | mechanical locks keys provide records key used specific door keys easily copied transferred unauthorized person.mechanical key lost key holder longer authorized use protected area locks must rekeyed.electronic access control electronic access control eac uses computers solve limitations mechanical locks keys.wide range credentials used replace mechanical keys.electronic access control system grants access based credential presented. |
Access control | access granted door unlocked predetermined time transaction recorded.access refused door remains locked attempted access recorded.system also monitor door alarm door forced open held open long unlocked.when credential presented reader reader sends credentials information usually number control panel highly reliable processor.control panel compares credentials number access control list grants denies presented request sends transaction log database.access denied based access control list door remains locked. |
Access control | match credential access control list control panel operates relay turn unlocks door.control panel also ignores door open signal prevent alarm.often reader provides feedback flashing red led access denied flashing green led access granted.the description illustrates single factor transaction.credentials passed around thus subverting access control list.example alice access rights server room bob not. |
Access control | alice either gives bob credential bob takes access server room.prevent twofactor authentication used.two factor transaction presented credential second factor needed access granted another factor pin second credential operator intervention biometric input.there three types factors authenticating informationsomething user knows e.g.password passphrase pinsomething user smart card key fobsomething user fingerprint verified biometric measurementpasswords common means verifying users identity access given information systems.addition fourth factor authentication recognized someone know whereby another person knows provide human element authentication situations systems set allow scenarios. |
Access control | example user may password forgotten smart card.scenario user known designated cohorts cohorts may provide smart card password combination extant factor user question thus provide two factors user missing credential giving three factors overall allow access.credential credential physicaltangible object piece knowledge facet persons physical enables individual access given physical facility computerbased information system.typically credentials something person knows number pin something access badge something biometric feature something measurable behavioural patterns combination items.known multifactor authentication. |
Access control | typical credential access card keyfob newer software also turn users smartphones access devices.there many card technologies including magnetic stripe bar code wiegand khz proximity bit cardswipe contact smart cards contactless smart cards.also available keyfobs compact id cards attach key ring.biometric technologies include fingerprint facial recognition iris recognition retinal scan voice hand geometry.builtin biometric technologies found newer smartphones also used credentials conjunction access software running mobile devices.addition older traditional card access technologies newer technologies near field communication nfc bluetooth low energy ultrawideband uwb also communicate user credentials readers system building access. |
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