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88-431: Motion simulators can be classified according to whether the occupant is controlling the vehicle(such as in a Flight Simulator for training pilots), or whether the occupant is a passive rider , such as in a simulator ride or motion theater. Motion platforms for aircraft simulators are at the high end, plus some of the more expensive amusement park rides that use a simulator-type motion base; arcade amusement devices are in

176-445: A frequent-flyer program mileage award are usually included. This term is used in the transportation industry, in particular in traffic measures such as revenue passenger kilometer (RPK) and revenue passenger mile (RPM). Revenue passenger kilometres (RPKs) and revenue passenger miles (RPMs) are measures of traffic for an airline flight, bus , or train calculated by multiplying the number of revenue-paying passengers aboard

264-563: A " hack ". It could also refer to an innovative fix or a simple work-around, a solution that bends the rules, or a resource that can be used in such a way. It is also often used to signify creativity: to make existing things work, or to create new things with meager resources. Rasquache is the English form of the Spanish term rascuache , originally with a negative connotation in Mexico it

352-471: A constant speed or velocity is reached. At constant speed, visual cues give cues of motion until another acceleration takes place and the body's motion sensors once more send signals to the brain. In simulator motion platforms, after an initial acceleration is produced, the platform is re-set to a neutral position at a rate below human motion threshold so that the subject does not detect the so-called "wash out" phase of simulator motion cueing. The motion system

440-639: A flight simulator for the Comet 4 aircraft used a three-degrees-of-freedom hydraulic system. Simulator motion platforms today use 6 jacks ("Hexapods") giving all six degrees-of-freedom, the three rotations pitch, roll and yaw, plus the three translational movements heave (up and down), sway (sideways) and surge (longitudinal). 6 Dof motions are powerful cues when combined with outside-world (OTW) imagery. Motion platforms together with OTW imagery are used in : flight simulation, driving simulation, amusement rides, and small home-based simulators. The motion platform

528-478: A fluid called the endolymph. In each canal, there is a section where the diameter is larger than the rest of the canal. This section is called the ampulla and is sealed by a flap called the cupula. Angular accelerations are detected as follows: an angular acceleration causes the fluid in the canals to move, deflecting the cupula. The nerves in the cupula report the motion to both the brain and oculomotor muscles, stabilizing eye movements. A transfer function model between

616-412: A human test subject. Values of 0.5 ∘ / sec 2 {\displaystyle 0.5^{\circ }/\sec ^{2}} have been reported for pitch and roll accelerations in a flight simulator. The above studies indicate that the pilot's vestibular system detects accelerations before the aircraft instruments displays them. This can be considered an inner control loop in which

704-424: A larger market of more generalized "craft-oriented" simulation, entertainment, and virtual reality systems. Motion platforms are commonly used in the field of engineering for analysis and verification of vehicle performance and design. The ability to link a computer-based dynamic model of a particular system to physical motion gives the user the ability to feel how the vehicle would respond to control inputs without

792-423: A motion platform (if fitted) works in synchronization to the external visual scene. As discussed above, in the real world motion cues are processed by the brain before visual changes, and this must be followed in a simulator or dizziness and even nausea can occur in some people, so called "simulator sickness". For example, if the occupant commands the vehicle to roll to the left, the visual displays must also roll by

880-484: A neuron receives such a signal, it sends it on to an adjacent neuron through a bridge called a synapse. A synapse "sparks" the impulse between neurons through electrical and chemical means. These sensory signals are processed by the brain in response to signals that travel along motor nerves. Motor neurons, with their special fibres, carry these signals to muscles, which are instructed to either contract or relax. These are all sensors of acceleration, and do not respond when

968-459: A number of applications, including flight simulators for training pilots. The middle of the spectrum includes motion platforms in arcade amusement games , rides, and other arrangements. These systems fall into a price range from $ 10,000 to US$ 99,000. Typically the space requirements for such a platform are modest requiring only a portion of an arcade room and a smaller range of motion is provided via similar, less expensive, control systems than

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1056-590: A price range from $ 1,000 to US$ 9,000. Within the 2000s (decade), several individuals and business entities have developed these smaller, more affordable motion systems. Most of these systems were developed mainly by flight simulation enthusiasts, were sold as do it yourself projects, and could be assembled in the home from common components for around one thousand US dollars ($ 1,000). Recently, there has been increased market interest in motion platforms for more personal, in-home, use. The application of these motion systems extends beyond just flight training simulation into

1144-624: A real flight control system in a laboratory, integrating the pilot with the electrical, mechanical, and hydraulic components that exist on the real aircraft, a complete system evaluation can be conducted prior to initial flight testing. This type of testing allows the simulation of "seeded faults" (i.e. an intentional hydraulic leak, software error, or computer shutdown) which serve to validate that an aircraft's redundant design features work as intended. A test pilot can also help identify system deficiencies such as inadequate or missing warning indicators, or even unintended control stick motion. This testing

1232-421: A role. Use of angle grinder is not preferred as large amounts of harmful sparks and fumes (and particulates ) are generated when compared with using reciprocating saw or band saw . Angle grinders produce sparks when cutting ferrous metals. They also produce shards cutting other materials. The blades themselves may also break. This is a great hazard to the face and eyes especially, as well as other parts of

1320-423: A simulation of flight or other motion. Some examples: Some driving and flying simulation games allow the use of specialized controllers such as steering wheels, foot pedals or joysticks. Certain game controllers designed in recent years have employed haptic technology to provide realtime, tactile feedback to the user in the form of vibration from the controller. A motion simulator takes the next step by providing

1408-570: A tiny focus area within the larger context, positioning DIY as a venue for holistic engagement. DIY ethic is the ethic of self-sufficiency through completing tasks without the aid of a paid expert . The DIY ethic promotes the idea that anyone is capable of performing a variety of tasks rather than relying on paid specialists. Italian archaeologists have unearthed the ruins of a 6th-century BC Greek structure in southern Italy. The ruins appeared to come with detailed assembly instructions and are being called an "ancient IKEA building". The structure

1496-526: A wide range of skill sets. DIY has been described as a "self-made-culture"; one of designing, creating, customizing and repairing items or things without any special training. DIY has grown to become a social concept with people sharing ideas, designs, techniques, methods and finished projects with one another either online or in person. DIY can be seen as a cultural reaction in modern technological society to increasing academic specialization and economic specialization which brings people into contact with only

1584-444: Is a function of the way our brain interprets signals from our various sensory systems, such as sight, sound, balance and touch. Special sensory pick-up units (or sensory "pads") called receptors translate stimuli into sensory signals. External receptors (exteroceptors) respond to stimuli that arise outside the body, such as the light that stimulates the eyes, sound pressure that stimulates the ear, pressure and temperature that stimulates

1672-444: Is a person who travels in a vehicle , but does not bear any responsibility for the tasks required for that vehicle to arrive at its destination or otherwise operate the vehicle, and is not a steward. The vehicles may be bicycles , buses , cars , passenger trains , airliners , ships , ferryboats , personal watercrafts , all terrain vehicles , snowmobiles , and other methods of transportation. Crew members (if any), as well as

1760-488: Is available. As a means of adaptation during the Cuban Special Period times of economic crisis, resolver ("to resolve") became an important part of Cuban culture. Resolver refers to a spirit of resourcefulness and do-it-yourself problem solving. Jugaad is a colloquial Hindi , Bengali , Marathi , Punjabi , Sindhi and Urdu word, which refers to a non-conventional, frugal innovation, often termed

1848-486: Is entirely in terms of abstractions. It trains you to be an insurance salesman or a bureaucrat, or some kind of cerebral character. In the 1970s, DIY spread through the North American population of college and recent-college-graduate age groups. In part, this movement involved the renovation of affordable, rundown older homes. But, it also related to various projects expressing the social and environmental vision of

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1936-454: Is lined with hairs connected to nerve endings and is partially filled with fluid. When the head experiences acceleration the fluid moves within the canals, causing the hair follicles to move from their initial orientation. In turn the nerve endings signal to the brain, which interprets them as acceleration in the three rotations pitch, roll, or yaw. The vestibular system generates reflexes to maintain perceptual and postural stability, compared to

2024-405: Is necessary to simulate extremely high risk events that cannot be conducted in flight but nonetheless must be demonstrated. While 6 degree-of-freedom motion is not necessary for this type of testing, the visual screen allows the pilot to "fly" the aircraft while the faults are simultaneously triggered. Motion simulators are sometimes used in theme parks or amusement parks to give the park guests

2112-501: Is the damping ratio, ω n {\displaystyle \omega _{n}} is the natural frequency of the cupula, and u ( t ) {\displaystyle u(t)} is the input angular acceleration. Values of ζ {\displaystyle \zeta } have been reported to be between 3.6 and 6.7 while values of ω n {\displaystyle \omega _{n}} have been reported to be between 0.75 and 1.9. Thus,

2200-773: Is the method of building, modifying , or repairing things by oneself without the direct aid of professionals or certified experts. Academic research has described DIY as behaviors where "individuals use raw and semi-raw materials and parts to produce, transform, or reconstruct material possessions, including those drawn from the natural environment (e.g., landscaping)". DIY behavior can be triggered by various motivations previously categorized as marketplace motivations (economic benefits, lack of product availability, lack of product quality, need for customization), and identity enhancement ( craftsmanship , empowerment, community seeking, uniqueness). The term "do-it-yourself" has been associated with consumers since at least 1912 primarily in

2288-514: Is then ready to make the next acceleration which will be detected by the subject, as in the real world. This so-called "acceleration onset cueing" is an important aspect in simulators with motion platforms and models the way humans feel motions in the real world. The vestibular system is the balance and equilibrium system of the body that includes the left and right vestibular organs of the "inner ear". It consists of three semicircular canals, or tubes, arranged at right angles to one another. Each canal

2376-595: Is used in military and commercial flight instruction training applications. Also in entertainment devices in theme parks, with users from single people to many, seated in rows in front of screens in which pictures are projected, synchronised with motions from the platform under the simulator cab. A typical high-end motion system is the Stewart platform , which provides full 6 degrees of freedom (3 translation and 3 rotation) and employs sophisticated algorithms to provide high-fidelity motions and accelerations. These are used in

2464-559: Is used to orient the gravity vector 'g' of the simulator platform: β = sin − 1 ⁡ ( f g ) {\displaystyle \beta =\sin ^{-1}({\frac {f}{g}})} Typically, to find position, the low-pass filter (in a continuous-time setting) is represented in the s-domain with the following transfer function : L P ( s ) = 1 1 + s T {\displaystyle LP(s)={\frac {1}{1+sT}}} Passenger A passenger

2552-571: The DIY Network cable television channel. Both were launched to appeal to the growing percentage of North Americans interested in DIY topics, from home improvement to knitting . Such channels have multiple shows revealing how to stretch one's budget to achieve professional-looking results ( Design Cents , Design on a Dime , etc.) while doing the work yourself. Toolbelt Diva specifically caters to female DIYers. Beyond magazines and television,

2640-603: The PBS television series This Old House , starring Bob Vila , premiered and spurred a DIY television revolution. The show was immensely popular, educating people on how to improve their living conditions (and the value of their house) without the expense of paying someone else to do (as much of) the work. In 1994, the HGTV Network cable television channel was launched in the United States and Canada, followed in 1999 by

2728-478: The underground punk scenes, and significantly altered the way fans interacted with musicians. Zines quickly branched off from being hand-made music magazines to become more personal; they quickly became one of the youth culture's gateways to DIY culture. This led to tutorial zines showing others how to make their own shirts, posters, zines, books, food, etc. The terms "DIY" and "do-it-yourself" are also used to describe: Much contemporary DIY music has its origins in

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2816-515: The " Houseboat Summit " panel discussion in a 1967 edition of the San Francisco Oracle ) reflected a growing sentiment: Our educational system, in its entirety, does nothing to give us any kind of material competence. In other words, we don't learn how to cook, how to make clothes, how to build houses, how to make love, or to do any of the absolutely fundamental things of life. The whole education that we get for our children in school

2904-751: The 1960s and early 1970s. The young visionary Stewart Brand , working with friends and family, and initially using the most basic of typesetting and page-layout tools, published the first edition of The Whole Earth Catalog (subtitled Access to Tools ) in late 1968. The first Catalog , and its successors, used a broad definition of the term "tools." There were informational tools, such as books (often technical in nature), professional journals, courses and classes. There were specialized, designed items, such as carpentry and stonemasonry tools, garden tools , welding equipment, chainsaws , fiberglass materials and so on – even early personal computers. The designer J. Baldwin served as technology editor and wrote many of

2992-572: The USSR. The same studies suggest that the threshold is not a linear acceleration but rather a jerk motion (third time derivative of position), and the reported threshold value is on the order of 0.1 ft/s. These findings are supported by early studies showing that human movement kinematics is represented by characteristics of jerk profiles. Angular accelerations are detected by semicircular canals. The three semicircular canals are mutually orthogonal (similar to three-axis accelerometer) and are filled with

3080-466: The angle of the cupula θ {\displaystyle \theta } is given by θ ¨ + 2 ζ ω n θ ˙ + ω n θ = u ( t ) {\displaystyle {\ddot {\theta }}+2\zeta \omega _{n}{\dot {\theta }}+\omega _{n}\theta =u(t)} where ζ {\displaystyle \zeta }

3168-433: The art and design community. The terms Hacktivist , Craftivist, or maker have been used to describe creatives working within a DIY framework (Busch). Otto von Busch describes 'Hacktivism' as "[including] the participant in the process of making, [to give] rise to new attitudes within the 'maker' or collaborator" (Busch 49). Busch suggests that by engaging in participatory forms of fashion, consumers are able to step away from

3256-664: The body. Modern power tools are mostly equipped with advanced dust control systems, including HEPA-certified dust extractors and integrated water delivery systems , to mitigate the release of harmful particulates. The Occupational Safety and Health Administration ( OSHA ) mandates the use of such control measures in environments with high dust levels. DIY is prevalent amongst the fashion community, with ideas being shared on social media, such as YouTube, about clothing, jewellery, makeup, and hairstyles. Techniques include distressing and bleaching jeans, redesigning old shirts, and studding denim. The concept of DIY has also emerged within

3344-728: The brain and oculomotor muscles. Studies indicate that the otoliths detect the tangential component of the applied forces. A transfer function model between the perceived force y ( s ) {\displaystyle y(s)} and the applied forces f ( s ) {\displaystyle f(s)} is given by: y ( s ) f ( s ) = 2.02 ( s + 0.1 ) s + 0.2 {\displaystyle {\frac {y(s)}{f(s)}}={\frac {2.02(s+0.1)}{s+0.2}}} Based on centrifuge experiments, threshold values of 0.0011 ft/s have been reported; values up to 0.4 ft/s have been reported based on airborne studies in

3432-407: The brain in proportion to accelerations to which the body is subject. An example of a "popular" proprioceptor mentioned by aircraft pilots, is the feeling in the "seat of the pants". Proprioceptors respond to stimuli generated by muscle movement and muscle tension. Signals generated by exteroceptors and proprioceptors are carried by sensory neurons or nerves and are called electrochemical signals. When

3520-440: The car are blindfolded. If the driver were to step on the gas, the car would accelerate forward thus pressing each passenger back into their seat. In this situation, each passenger would perceive the increase in speed by sensing the additional pressure from the seat cushion. Washout filters are an important aspect of the implementation of motion platforms as they allow motion systems, with their limited range of motion, to simulate

3608-460: The carrier act with a certain standard of care. The number of passengers that a vehicle or vessel may legally carry is defined as its seating capacity . A revenue passenger is someone who has paid a transport operator for her or his trip. That excludes non-paying passengers such as airline employees flying on free or nearly-free passes , babies and children who do not have a seat of their own, etc. However, passengers who paid for their trip with

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3696-433: The core values of the DIY punk ethic by leveraging creative ways of communication through zines and other projects. Adherents of the DIY punk ethic also work collectively. For example, punk impresario David Ferguson 's CD Presents was a DIY concert production , recording studio , and record label network. A form of independent filmmaking characterized by low budgets, skeleton crews, and simple props using whatever

3784-405: The cues the brain receives by each of the body's sensory inputs must agree. It is physically impossible with most existing systems to correctly simulate large-scale motion in the limited space available in a simulator. The standard approach is to simulate cues of initial acceleration as closely as possible. In principle, velocity cannot be directly perceived by relative cues alone, like those from

3872-450: The dark aesthetics and nihilist discourse in punk fanzines in the 1970s and onwards in the shadow of rising unemployment and social tensions. In the 1960s and 1970s, books and TV shows about the DIY movement and techniques on building and home decoration began appearing. By the 1990s, the DIY movement felt the impact of the digital age with the rise of the internet. With computers and the internet becoming mainstream, increased accessibility to

3960-610: The decoration. The building was built by Greek artisans coming from the Spartan colony of Taranto in Apulia. In North America, there was a DIY magazine publishing niche in the first half of the twentieth century. Magazines such as Popular Mechanics (founded in 1902) and Mechanix Illustrated (founded in 1928) offered a way for readers to keep current on useful practical skills, techniques, tools, and materials. As many readers lived in rural or semi-rural regions, initially much of

4048-419: The domain of home improvement and maintenance activities. The phrase "do it yourself" had come into common usage (in standard English) by the 1950s, in reference to the emergence of a trend of people undertaking home improvement and various other small craft and construction projects as both a creative-recreational and cost-saving activity. Subsequently, the term DIY has taken on a broader meaning that covers

4136-406: The driver or pilot of the vehicle, are usually not considered to be passengers. For example, a flight attendant on an airline would not be considered a passenger while on duty and the same with those working in the kitchen or restaurant on board a ship as well as cleaning staff, but an employee riding in a company car being driven by another person would be considered a passenger, even if the car

4224-482: The driver other than the benefit of his or her company or the mere sharing of expenses". In other situations, however, guest statutes may limit the ability of passengers to sue the driver of the vehicle over an accident. Many places require cars to be outfitted with measures specifically for the protection of passengers, such as passenger-side air bags . With respect to passengers on commercial vehicles or vessels, both national laws and international treaties require that

4312-487: The earliest example of this attitude was the punk music scene of the 1970s. More recently, the orthodox understanding that DIY originates in 1970s punk, with its clearest practices being in the self-produced 7" single and self-published fanzines, has been challenged. As George McKay asks in the title of his 2023 article: 'Was punk DIY? Is DIY punk?' McKay argues instead for what he terms a 'depunking' of DIY. Riot grrrl , associated with third-wave feminism , also adopted

4400-403: The filter is split into translation and rotational signals. High-pass filters are used for simulating transient translational and rotational accelerations, while the low-pass filters are used to simulate sustaining accelerations. The adaptive washout filter uses the classical washout filter scheme, but utilizes a self-tuning mechanism that is not featured with the classical washout filter. Finally,

4488-474: The following: Examples of high dust level tasks include: Some power tools are equipped with dust collection system (e.g. HEPA vacuum cleaner) or integrated water delivery system which extract the dust after emission. While the type of material used will determine the composition of the dust generated, the size and amount of particulates produced are mainly determined by the type of tool used. Implementation of effective dust control measures may also play

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4576-463: The high-end platforms. In the 1980s, it became a trend for arcade video games to use hydraulic motion simulator arcade cabinets . The trend was sparked by Sega 's "taikan" games, with "taikan" meaning "body sensation" in Japanese. Sega's first game to use a motion simulator cabinet was Space Tactics (1981), a space combat simulator that had a cockpit cabinet where the screen moved in sync with

4664-613: The idea of "mass-homogenized 'Mc-Fashion ' " (Lee 2003)" , as fashion Hacktivism allows consumers to play a more active role in engaging with the clothes they wear (Busch 32). DIY as a subculture was brought forward by the punk movement of the 1970s. Instead of traditional means of bands reaching their audiences through large music labels, bands began recording, manufacturing albums and merchandise, booking their own tours, and creating opportunities for smaller bands to get wider recognition through repetitive low-cost DIY touring. The burgeoning zine movement took up coverage of and promotion of

4752-424: The inputs are expressed in the vehicle-body-fixed frame. Since low-frequency force is dominant in driving the motion base, force is high-pass filtered, and yields the simulator translations. Much the same operation is done for angular rate. To identify the tilt of the motion platform, the tilt mechanism first supplies the low-frequency component of force for rotation calculation. Then, the high-frequency component 'f'

4840-542: The internet has led to more households undertaking DIY methods. Platforms, such as YouTube or Instagram, provide people the opportunity to share their creations and instruct others on how to replicate DIY techniques in their own home. The DIY movement is a re-introduction (often to urban and suburban dwellers) of the old pattern of personal involvement and use of skills in the upkeep of a house or apartment, making clothes; maintenance of cars, computers, websites; or any material aspect of living. The philosopher Alan Watts (from

4928-499: The late 1970s punk rock subculture. It developed as a way to circumnavigate the corporate mainstream music industry . By controlling the entire production and distribution chain, DIY bands attempt to develop a closer relationship between artists and fans. The DIY ethic gives total control over the final product without need to compromise with record major labels. According to the punk aesthetic, one can express oneself and produce moving and serious works with limited means. Arguably,

5016-432: The limited space of a laboratory. The standard approach to simulating motion (so called motion cueing) is to simulate the “relevant” cues as closely as possible which trigger motion perception . These cues can be visual, auditory, or somatosensory in nature. Visual and auditory cues enable humans to perceive their location in space on an absolute scale, whereas somatosensory cues (mainly proprioception and other signals from

5104-446: The material related to their needs on the farm or in a small town. By the 1950s, DIY became common usage with the emergence of people undertaking home improvement projects, construction projects and smaller crafts. Artists began to fight against mass production and mass culture by claiming to be self-made. However, DIY practices also responded to geopolitical tensions, such as in the form of home-made Cold War nuclear fallout shelters, and

5192-533: The mid-1990s, DIY home-improvement content began to find its way onto the World Wide Web . HouseNet was the earliest bulletin-board style site where users could share information. Since the late 1990s, DIY has exploded on the Web through thousands of sites. In the 1970s, when home video ( VCRs ) came along, DIY instructors quickly grasped its potential for demonstrating processes by audio-visual means. In 1979,

5280-499: The middle, and motion platforms for home use are low-cost but not as capable of the higher-level devices. Many motion platforms are used in flight simulators used to train pilots. One of the first motion platforms, the Sanders Teacher, was created in 1910. This was a model aircraft connected to the ground by a universal joint. When wind was present, the pilot in training was able to use the aircraft's control surfaces to move

5368-476: The model in the three rotational degrees of freedom pitch, roll and yaw. In 1929 a significant advance in motion platform technology was made with the patent by Edwin Link for what became known as the "Link Trainer". This used the pilot's control stick and rudder controls to control organ-type bellows under the simulator cockpit. The bellows could inflate or deflate, giving movement in pitch, roll, and yaw. In 1958

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5456-524: The most harmful form (other than ultra-fines ) of air pollution . Exposure to particulate matter, especially PM2.5 and ultrafine particles (PM0.1), has serious health implications. According to the World Health Organization, there is no safe level of particulate exposure, with these emissions linked to increased risks of respiratory and cardiovascular diseases. Many tasks create dust . With high dust levels are caused by one of more

5544-449: The most sophisticated motion simulator cabinets in arcades was Sega's R360 (1990), which simulated the full 360-degree rotation of an aircraft. Sega have since continued to manufacture motion simulator cabinets for arcade games through to the 2010s. The lower-cost systems include home-based motion platforms, which have recently become a more common device used to enhance video games, simulation, and virtual reality. These systems fall into

5632-439: The need to construct expensive prototypes. For example, an engineer designing an external fuel tank for an aircraft could have a pilot determine the effect on flying qualities or a mechanical engineer could feel the effects of a new brake system without building any hardware, saving time and money. Flight simulators are also used by aircraft manufacturers to test new hardware. By connecting a simulated cockpit with visual screen to

5720-445: The next acceleration to be produced by the motion platform and sensed by the subject of the simulator. The human eye is an important source of information in motion simulation where a high resolution picture is available such as by day in good visibility. The eye relays information to the brain about the craft's position, velocity, and attitude relative to the ground. As a result, it is essential for realistic simulation that cues from

5808-646: The non-commute leg of a commuter bus service. In such cases, the main display signs on the front and curbside of the bus typically display a message such as “no pax” or “out of service” (sometimes abbreviated as “O/S”). In British railway parlance, passenger, as well as being the end user of a service, is also a categorisation of the type of rolling stock used. In the British case, there are several categories of passenger train , which include: [REDACTED] Media related to Passengers at Wikimedia Commons Do it yourself " Do it yourself " (" DIY ")

5896-543: The on-screen action. The "taikan" trend later began when Yu Suzuki 's team at Sega (later known as Sega AM2 ) developed Hang-On (1985), a racing video game where the player sits on and moves a motorbike replica to control the in-game actions. Suzuki's team at Sega followed it with hydraulic motion simulator cockpit cabinets for rail shooters such as Space Harrier (1985), racing games such as Out Run (1986), and arcade combat flight simulators such as After Burner (1987) and G-LOC: Air Battle (1990). One of

5984-402: The optimal washout filter takes into account models for vestibular system. The classical washout filter is simply a combination of high-pass and low-pass filters ; thus, the implementation of the filter is compatibly easy. However, the parameters of these filters have to be empirically determined. The inputs to the classical washout filter are vehicle-specific forces and angular rate. Both of

6072-479: The order of 10 – 20 seconds, the hair follicles return to the “zero” or vertical position and the brain interprets this as the acceleration ceasing. Additionally, there is a lower acceleration threshold of about 2 degrees per second that the brain cannot perceive. In other words, slow motion below the threshold will not generate vestibular cues. As discussed in the preceding “Proprioceptors” section, this allows simulator motion to be "washed out" below threshold, ready for

6160-430: The other senses of vision, touch and sound, the vestibular input is registered quickly by the brain, whereas visual changes such as perspective and horizon movement, follow shortly after. Therefore, in a simulator it is essential that visual cues are not perceived before motion cues, the reverse of the real-world situation, or so-called "simulator sickness" can occur. Second, if the head experiences sustained accelerations on

6248-401: The overall passenger load factor . These measurements can further be used to measure unit revenues and unit costs. In transportation, a "no pax" trip is a trip without passengers. For example, no-pax flights are Air cargo , ferry and positioning flights. Similarly, with a public transit bus it can be used at the beginning and end of a driver’s work shift to/from the bus terminal, or in

6336-543: The perceived angular displacement y ( s ) {\displaystyle y(s)} and the actual angular displacement p h i ( s ) {\displaystyle phi(s)} is: y ( s ) p h i ( s ) = 0.07 s 3 ( s + 50 ) ( s + 0.05 ) ( s + 0.03 ) {\displaystyle {\frac {y(s)}{phi(s)}}={\frac {0.07s^{3}(s+50)}{(s+0.05)(s+0.03)}}} A second-order model of

6424-405: The pilots responds to accelerations that occur in full-motion simulators and aircraft, but not in fixed simulators. This effect shows that there is a potential negative training transfer when transitioning from a fixed-based simulator to an aircraft and indicates the need for motion systems for full-fidelity pilot training. It is physically impossible to precisely simulate large scale real motion in

6512-404: The player full-body tactile feedback. Motion gaming chairs can roll to the left and right and pitch forward and backward to simulate turning corners, accelerations and decelerations. Motion platforms permit a more stimulative and potentially realistic gaming experience, and allow for even greater physical correlation to sight and sound in game play. The way we perceive our body and our surroundings

6600-451: The range of vehicle dynamics being simulated. Since the human vestibular system automatically re-centers itself during steady motions, washout filters are used to suppress unnecessary low-frequency signals while returning the simulator back to a neutral position at accelerations below the threshold of human perception. For example, a pilot in a motion simulator may execute a steady, level turn for an extended period of time which would require

6688-902: The reviews of fabrication tools, tools for working soil, etc. The Catalog 's publication both emerged from and spurred the great wave of experimentalism, convention-breaking, and do-it-yourself attitude of the late 1960s. Often copied, the Catalog appealed to a wide cross-section of people in North America and had a broad influence. DIY home improvement books burgeoned in the 1970s, first created as collections of magazine articles. An early, extensive line of DIY how-to books were created by Sunset Books , based upon previously published articles from their magazine, Sunset , based in California. Time-Life , Better Homes and Gardens , Balcony Garden Web and other publishers soon followed suit. In

6776-404: The same magnitude and at the same rate. Simultaneously, the cab tilts the occupant to imitate the motion. The occupant's proprioceptors and vestibular system sense this motion. The motion and change in the visual inputs must align well enough such that any discrepancy is below the occupant's threshold to detect the differences in motion. In order to be an effective training or entertainment device,

6864-671: The scope of home improvement DIY continues to grow online where most mainstream media outlets now have extensive DIY-focused informational websites such as This Old House , Martha Stewart , Hometalk , and the DIY Network . These are often extensions of their magazine or television brand. The growth of independent online DIY resources is also spiking. The number of homeowners who blog about their experiences continues to grow, along with DIY websites from smaller organizations. Use of power tools can cause adverse effects on people living nearby. Power tools can produce large amounts of particulates including, ultrafine particles . Particulates are

6952-481: The skin and chemical substances that stimulate the nose and mouth. Internal receptors (enteroceptors) respond to stimuli that arise from within blood vessels. Postural stability is maintained through the vestibular reflexes acting on the neck and limbs. These reflexes, which are key to successful motion synchronization, are under the control of three classes of sensory input: Proprioceptors are receptors located in muscles, tendons, joints and gut, which send signals to

7040-610: The subject backwards and use the gravity vector as a replacement for correct resulting force from gravity and forward acceleration. In this case, leaning a simulator backwards and rotating the visual picture by the same angle gives the subject a force on the back that is perceived as forward acceleration. Linear accelerations are detected by otoliths. The otolith structure is simpler than the three-axis semicircular canals that detect angular accelerations. The otoliths contain calcium carbonate particles that lag behind head movement, deflecting hair cells. These cells transmit motion information to

7128-406: The system is overdamped with distinct, real roots. The shorter time constant is 0.1 seconds, while the longer time constant depends on the axis about which the test subject is accelerating (roll, pitch, or yaw). These time constants are one to two orders of magnitude greater than the shorter time constant. Experiments have shown that angular accelerations below a certain level cannot be detected by

7216-547: The system stay at the associated bank angle, but a washout filter allows the system to slowly move back to an equilibrium position at a rate below the threshold which the pilot can detect. This allows the higher level dynamics of the computed vehicle to provide realistic cues for human perception, while remaining within the limitations of the simulator. Three common types of washout filters include classical, adaptive and optimal washout filters. The classical washout filter comprises linear low-pass and high-pass filters. The signal into

7304-435: The time. It looks as if someone was instructing others how to mass-produce components and put them together in this way." Much like our modern instruction booklets, various sections of the luxury building were inscribed with coded symbols showing how the pieces slotted together. The characteristics of these inscriptions indicate they date back to around the 6th century BC, which tallies with the architectural evidence suggested by

7392-458: The vehicle by the distance traveled . On long-distance buses and trains (and some planes), passengers may board and disembark at intermediate stops, in which case RPMs/RPKs have to be calculated for each segment if a careful total is needed. Revenue passenger miles can be considered the basic amount of "production" that an airline creates. The revenue passenger miles can be compared to the available seat miles over an airline's system to determine

7480-440: The vestibular system) provide only feedback of accelerations. For example, consider riding in a car traveling at some arbitrary constant speed. In this situation, our sense of sight and sound provide the only cues (excluding engine vibration) that the car is moving; no other forces act on the passengers of the car except for gravity. Next, consider the same example of a car moving at constant speed except this time, all passengers of

7568-407: The vestibular system. For such a system, flying in space with some constant velocity is not different from sitting in a chair. However, changing the velocity is perceived as acceleration, or force acting on the human body. For the case of constant linear acceleration, a substitute for the real situation is simple. Since the amplitude of the acceleration is not very well perceived by humans, one can tilt

7656-623: Was a temple-like building discovered at Torre Satriano , near the southern city of Potenza , in Basilicata . This region was recognized as a place where local people mingled with Greeks who had settled along the southern coast known as Magna Graecia and in Sicily from the 8th century BC onwards. Christopher Smith, director of the British School at Rome , said that the discovery was, "the clearest example yet found of mason's marks of

7744-425: Was being driven on company business. In most jurisdictions, laws have been enacted that dictate the legal obligations of the owner of a vehicle or vessel, or of the driver or pilot of the same, towards the passengers. With respect to passengers riding in cars and vans, the driver may owe a duty of care to passengers, particularly where the passenger's presence in the vehicle can be seen to "confer some benefit on

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