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43-538: Zhangjiajie Glass footpath is a skywalk bridge in Zhangjiajie , Hunan , above the Wulingyuan area. The bridge, built as an attraction for tourists, is glass-bottomed and is transparent. When it opened it was the longest and tallest glass bottomed bridge in the world. The bridge, opened to the public on August 20, 2016, measures 430 metres (1,410 ft) in total length and 6 metres (20 ft) in width, and

86-446: A BTS station and utilize space underneath the rail line and BTS pillar supports. These skywalks have connector ramps which connect stations to malls seamlessly and are paid for by the malls themselves, otherwise the city and BTS fund walkway development. A 50km long extension project was shelved in 2011 due to funding issues, nevertheless the system is growing organically. In Hong Kong , there are numerous foot bridge networks across

129-515: A shopping mall . Non-commercial areas with closely associated buildings, such as university campuses, can often have skyways and/or tunnels connecting buildings. The world's largest discontinuous skyway network – Calgary, Alberta, Canada's " +15 Walkway " system – has a total length of 16 km (9.9 mi). The Minneapolis Skyway System is the world's largest continuous system and spans 9.5 miles (15.3 km) connecting 80 blocks in downtown Minneapolis , Minnesota , United States . On

172-530: A desert-battle simulation of one force invading another involved the modeling of 66,239 tanks, trucks and other vehicles on simulated terrain around Kuwait , using multiple supercomputers in the DoD High Performance Computer Modernization Program. Other examples include a 1-billion-atom model of material deformation; a 2.64-million-atom model of the complex protein-producing organelle of all living organisms,

215-400: A different answer for each execution. Although this might seem obvious, this is a special point of attention in stochastic simulations , where random numbers should actually be semi-random numbers. An exception to reproducibility are human-in-the-loop simulations such as flight simulations and computer games . Here a human is part of the simulation and thus influences the outcome in a way that

258-470: A map that uses numeric coordinates and numeric timestamps of events. Similarly, CGI computer simulations of CAT scans can simulate how a tumor might shrink or change during an extended period of medical treatment, presenting the passage of time as a spinning view of the visible human head, as the tumor changes. Other applications of CGI computer simulations are being developed to graphically display large amounts of data, in motion, as changes occur during

301-497: A simulation run. Generic examples of types of computer simulations in science, which are derived from an underlying mathematical description: Specific examples of computer simulations include: Notable, and sometimes controversial, computer simulations used in science include: Donella Meadows ' World3 used in the Limits to Growth , James Lovelock's Daisyworld and Thomas Ray's Tierra . In social sciences, computer simulation

344-660: A simulation". Computer simulation developed hand-in-hand with the rapid growth of the computer, following its first large-scale deployment during the Manhattan Project in World War II to model the process of nuclear detonation . It was a simulation of 12 hard spheres using a Monte Carlo algorithm . Computer simulation is often used as an adjunct to, or substitute for, modeling systems for which simple closed form analytic solutions are not possible. There are many types of computer simulations; their common feature

387-413: A smaller scale, terminals of large airports are often connected by skywalk systems, as at Manchester Airport , United Kingdom; in many airports, retractable jet bridges provide a direct connection between airplanes and terminals. Some cities have the equivalent of a skyway underground, and there are also mixed subway–skyway systems; see underground city . Besides pedestrian safety and convenience,

430-420: A state in which the system is in equilibrium. Such models are often used in simulating physical systems, as a simpler modeling case before dynamic simulation is attempted. Formerly, the output data from a computer simulation was sometimes presented in a table or a matrix showing how data were affected by numerous changes in the simulation parameters . The use of the matrix format was related to traditional use of

473-631: A system is represented as the running of the system's model. It can be used to explore and gain new insights into new technology and to estimate the performance of systems too complex for analytical solutions . Computer simulations are realized by running computer programs that can be either small, running almost instantly on small devices, or large-scale programs that run for hours or days on network-based groups of computers. The scale of events being simulated by computer simulations has far exceeded anything possible (or perhaps even imaginable) using traditional paper-and-pencil mathematical modeling. In 1997,

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516-662: A time and expected to be visited by about 8,000 people per day, had reportedly attracted more than 80,000 visitors per day. The authorities said that the government decided to suspend operations due to the "urgency to improve and update" the attraction, including its car parks, ticket-booking system, and customer service. The bridge reopened on September 30, 2016. Skywalk In North America skyways are usually owned by businesses, and are therefore not public spaces (compare with sidewalk ). However, in Asia, such as Bangkok's and Hong Kong's skywalks, they are built and owned separately by

559-419: A wide variety of practical contexts, such as: The reliability and the trust people put in computer simulations depends on the validity of the simulation model , therefore verification and validation are of crucial importance in the development of computer simulations. Another important aspect of computer simulations is that of reproducibility of the results, meaning that a simulation model should not provide

602-470: Is a 1.3 km (0.8 mi) long skywalk connecting the suburban regions of Bandra and Kurla . Brussels , Belgium has a skyway between the two Belgacom Towers . London has skywalks on the Barbican Estate and London Wall . The City of London Pedway Scheme was devised as part of the post World War II reconstruction plans for London, it was put into effect mainly from the mid-1950s to

645-439: Is an integral component of the five angles of analysis fostered by the data percolation methodology, which also includes qualitative and quantitative methods, reviews of the literature (including scholarly), and interviews with experts, and which forms an extension of data triangulation. Of course, similar to any other scientific method, replication is an important part of computational modeling Computer simulations are used in

688-414: Is hard, if not impossible, to reproduce exactly. Vehicle manufacturers make use of computer simulation to test safety features in new designs. By building a copy of the car in a physics simulation environment, they can save the hundreds of thousands of dollars that would otherwise be required to build and test a unique prototype. Engineers can step through the simulation milliseconds at a time to determine

731-478: Is made of a metal frame with more than 120 glass panels. Each of these panels is three-layered and is a 5.1-centimetre-thick (2 in) slab of tempered glass . There are three long swings attached to the underside of the bridge. There is also a provision for making a 285-metre (935 ft) bungee jump , considered to be highest bungee jump in the world. According to the Management Committee of

774-450: Is much harder is knowing what the accuracy (compared to measurement resolution and precision ) of the values are. Often they are expressed as "error bars", a minimum and maximum deviation from the value range within which the true value (is expected to) lie. Because digital computer mathematics is not perfect, rounding and truncation errors multiply this error, so it is useful to perform an "error analysis" to confirm that values output by

817-507: Is suspended about 300 metres (980 ft) above the ground. The bridge spans the canyon between two mountain cliffs in Zhangjiajie National Forest Park in the northwest of Hunan province. It is designed to carry up to 800 visitors at a time. The bridge was designed by Israeli architect Haim Dotan. To build the bridge, engineers erected four support pillars on the edges of the walls of the canyon. The bridge

860-775: Is the Zhangjiajie Glass Bridge , which sits between mountain peaks in China. The highest cantilevered skybridge as construction element of building exist atop of Kingdom Centre in Riyadh , Saudi Arabia . The world's highest 2-story skybridge, 170 m above the ground and 58 m long, between the two towers on 41st and 42nd floors in Petronas Twin Towers dual skyscrapers in Kuala Lumpur , Malaysia, which also has an elevated, air-conditioned walkway from

903-503: Is the attempt to generate a sample of representative scenarios for a model in which a complete enumeration of all possible states of the model would be prohibitive or impossible. The external data requirements of simulations and models vary widely. For some, the input might be just a few numbers (for example, simulation of a waveform of AC electricity on a wire), while others might require terabytes of information (such as weather and climate models). Input sources also vary widely: Lastly,

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946-561: Is the longest outdoor covered escalator system in the world according to Guinness World Records . Other large systems exist in Tsuen Wan and Mong Kok . The Mumbai Skywalk Project , India is a discontinuous network of over 50 km of skywalks in Mumbai Metropolitan Region , India. The skyways connect Mumbai Suburban Railway stations to important junctions, each 1 to 2 km in length. The first of these

989-486: Is very important to perform a sensitivity analysis to ensure that the accuracy of the results is properly understood. For example, the probabilistic risk analysis of factors determining the success of an oilfield exploration program involves combining samples from a variety of statistical distributions using the Monte Carlo method . If, for instance, one of the key parameters (e.g., the net ratio of oil-bearing strata)

1032-537: The Highlight Towers in Munich, Germany are joined by two skyways made of glass and steel. The Promenade Plantée in the 12th arrondissement of Paris , France includes pedestrian bridges and a linear park on an aqueduct of a former railway. Computer simulation Computer simulation is the running of a mathematical model on a computer , the model being designed to represent the behaviour of, or

1075-599: The Kuala Lumpur Convention Centre to Bukit Bintang shopping district. Malaysia also has the mountainarian tourist pedestrian glass-bottom Langkawi Sky Bridge in Kedah , Langkawi . One of the most famous similar cantilevered skybridges, that looks like uppered ship from the bird's-eye and submarine from the ground, known in Singapore's Marina Bay Sands resort complex of skyscrapers. One of

1118-863: The US Midwest , such as Minneapolis , Saint Paul , Des Moines , Cedar Rapids , Rochester , and Duluth . Most networks in North America are privately owned. Notable exceptions are skyways in Saint Paul and in New York ( High Line ), which are publicly owned. map The highest cantilevered skybridge between separate buildings in the world is in the Raffles City Chongqing skyscrapers complex in Chongqing , China. The world's longest pedestrian hanging skywalk, at 430 meters,

1161-550: The ribosome , in 2005; a complete simulation of the life cycle of Mycoplasma genitalium in 2012; and the Blue Brain project at EPFL (Switzerland), begun in May 2005 to create the first computer simulation of the entire human brain, right down to the molecular level. Because of the computational cost of simulation, computer experiments are used to perform inference such as uncertainty quantification . A model consists of

1204-540: The Bridge, the bridge has set ten world records spanning its design and construction. The record as longest glass bridge has since passed to a glass bridge in the Hongyagu Scenic Area, Hebei . On September 2, 2016, just 13 days after the bridge was opened, the authorities put out a notice saying that they were closing the bridge due to overwhelming visitor traffic. The bridge, designed to hold 800 people at

1247-566: The bridges stopped the project being fully imagined and by the end of the year 2000 nearly all of bridges had been removed, though evidence of the scheme still exists in some places. Sheffield , South Yorkshire has a famous skyway between two blocks of flats in the Park Hill Estate housing block with the phrase "I Love You Will U Marry Me" graffitied onto it. It has since become the subject of songs by local singers and bands such as Arctic Monkeys and Yungblud . The twin towers of

1290-678: The buildup of queues in the simulation of humans evacuating a building. Furthermore, simulation results are often aggregated into static images using various ways of scientific visualization . In debugging, simulating a program execution under test (rather than executing natively) can detect far more errors than the hardware itself can detect and, at the same time, log useful debugging information such as instruction trace, memory alterations and instruction counts. This technique can also detect buffer overflow and similar "hard to detect" errors as well as produce performance information and tuning data. Although sometimes ignored in computer simulations, it

1333-448: The chief reasons assigned by urban planners for skywalk development are decrease of traffic congestion , reduction in vehicular air pollution and separation of people from vehicular noise . A number of cities (for example, Spokane, Washington) have given intricate analysis to skywalk systems employing computer models to optimize skywalk layout. There is debate about the negative impact on urban areas of skyways. Robertson (1988) noted

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1376-472: The city government, connecting between privately run rail stations or other transport with their own footbridges, and run many kilometers. Skyways usually connect on the first few floors above the ground-level floor, though they are sometimes much higher, as in Petronas Towers . The space in the buildings connected by skyways is often devoted to retail business, so areas around the skyway may operate as

1419-536: The city. Particularly large networks exists around elevated or at grade MTR stations and connections between malls and housing estates in new town centers. The largest network spans Admiralty , Central and parts of Sheung Wan districts in the CBD and consists of the Central Elevated and Central–Mid-Levels Walkway systems which link up over 40 major office buildings. The Central–Mid-Levels walkway system

1462-415: The equations used to capture the behavior of a system. By contrast, computer simulation is the actual running of the program that perform algorithms which solve those equations, often in an approximate manner. Simulation, therefore, is the process of running a model. Thus one would not "build a simulation"; instead, one would "build a model (or a simulator)", and then either "run the model" or equivalently "run

1505-428: The exact stresses being put upon each section of the prototype. Computer graphics can be used to display the results of a computer simulation. Animations can be used to experience a simulation in real-time, e.g., in training simulations . In some cases animations may also be useful in faster than real-time or even slower than real-time modes. For example, faster than real-time animations can be useful in visualizing

1548-452: The matrix concept in mathematical models . However, psychologists and others noted that humans could quickly perceive trends by looking at graphs or even moving-images or motion-pictures generated from the data, as displayed by computer-generated-imagery (CGI) animation. Although observers could not necessarily read out numbers or quote math formulas, from observing a moving weather chart they might be able to predict events (and "see that rain

1591-440: The mid-1960s and eventually abandoned by the 1980s. Shad Thames has picturesque skyways between former warehouses, used in part to roll barrels between them. Liverpool conceived a project of building skyways around the city centre during the 1960s. The project saw bridges linking key buildings around the city centre, such as James Street railway station , Moorfields railway station and New Hall Place . Crime and low usage of

1634-782: The most impressionable hanging pedestrian skybridges, supported by two giant hands, Golden Bridge now attracts tourists in Ba Na Hills near Da Nang , Vietnam. In Bangkok , Thailand there are more than 5.4 km of covered wide dedicated elevated skywalks with lighting. These were developed due to lack of proper sidewalks as well as street hawkers and local merchants taking advantage of any sidewalk space as makeshift commercial real estate . Common reasons skywalks were built include to avoid street pollution, dust, wetness from food vendors and/or rain, potholes, long queues, crowds, and uneven pavement, supporting urbanism but probably most importantly, tourism receipts. Most skywalks connect to

1677-469: The negative impacts to street activities, and reductions to the property value at ground level. Woo (2012) found that skywalk systems could be negatively associated with promoting consumerism. Cui (2015) called for more research into the impact of skyways in developing countries. The Cincinnati Skywalk in Ohio was dismantled because of these concerns. There are significant skyway networks in many cities in

1720-523: The outcome of, a real-world or physical system. The reliability of some mathematical models can be determined by comparing their results to the real-world outcomes they aim to predict. Computer simulations have become a useful tool for the mathematical modeling of many natural systems in physics ( computational physics ), astrophysics , climatology , chemistry , biology and manufacturing , as well as human systems in economics , psychology , social science , health care and engineering . Simulation of

1763-436: The simulation will still be usefully accurate. Models used for computer simulations can be classified according to several independent pairs of attributes, including: Another way of categorizing models is to look at the underlying data structures. For time-stepped simulations, there are two main classes: For steady-state simulations, equations define the relationships between elements of the modeled system and attempt to find

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1806-446: The time at which data is available varies: Because of this variety, and because diverse simulation systems have many common elements, there are a large number of specialized simulation languages . The best-known may be Simula . There are now many others. Systems that accept data from external sources must be very careful in knowing what they are receiving. While it is easy for computers to read in values from text or binary files, what

1849-402: Was headed their way") much faster than by scanning tables of rain-cloud coordinates . Such intense graphical displays, which transcended the world of numbers and formulae, sometimes also led to output that lacked a coordinate grid or omitted timestamps, as if straying too far from numeric data displays. Today, weather forecasting models tend to balance the view of moving rain/snow clouds against

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