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Chakraborty S.,University of Southern Queensland | Mengersen K.,Queensland University of Technology | Fidge C.,Queensland University of Technology | Ma L.,Queensland University of Technology | Lassen D.,Queensland Rail
PLoS ONE | Year: 2015

We formalise and present a new generic multifaceted complex system approach for modelling complex business enterprises. Our method has a strong focus on integrating the various data types available in an enterprise which represent the diverse perspectives of various stakeholders. We explain the challenges faced and define a novel approach to converting diverse data types into usable Bayesian probability forms. The data types that can be integrated include historic data, survey data, and management planning data, expert knowledge and incomplete data. The structural complexities of the complex system modelling process, based on various decision contexts, are also explained along with a solution. This new application of complex system models as a management tool for decision making is demonstrated using a railway transport case study. The case study demonstrates how the new approach can be utilised to develop a customised decision support model for a specific enterprise. Various decision scenarios are also provided to illustrate the versatility of the decision model at different phases of enterprise operations such as planning and control. Copyright: © 2015 Chakraborty et al. This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


PubMed | University of Southern Queensland, Queensland Rail and Queensland University of Technology
Type: Journal Article | Journal: PloS one | Year: 2015

We formalise and present a new generic multifaceted complex system approach for modelling complex business enterprises. Our method has a strong focus on integrating the various data types available in an enterprise which represent the diverse perspectives of various stakeholders. We explain the challenges faced and define a novel approach to converting diverse data types into usable Bayesian probability forms. The data types that can be integrated include historic data, survey data, and management planning data, expert knowledge and incomplete data. The structural complexities of the complex system modelling process, based on various decision contexts, are also explained along with a solution. This new application of complex system models as a management tool for decision making is demonstrated using a railway transport case study. The case study demonstrates how the new approach can be utilised to develop a customised decision support model for a specific enterprise. Various decision scenarios are also provided to illustrate the versatility of the decision model at different phases of enterprise operations such as planning and control.


News Article | December 28, 2015
Site: www.reuters.com

Neighbors prepare to check out the damage after floods waters entered their business in Elba, Alabama, December 26, 2015. Damage caused by a tornado is seen in a neighborhood in Birmingham, Alabama, December 26, 2015. Law enforcement has the bridge closed while city workers place sand bags on the bridge to stop seepage in Elba, Alabama, December 26, 2015. Neighbours console each other after floods waters entered their business in Elba, Alabama, December 26, 2015. City crews clean up the damage caused by a tornado in a neighborhood in Birmingham, Alabama, December 26, 2015. A house is under water on the banks of the Pea River in Elba, Alabama, December 26, 2015. Traffic goes across the bridge on Alabama hwy 87 at the Pea River in Elba, Alabama, December 26, 2015. Damage caused by a tornado is seen in a neighborhood in Birmingham, Alabama, December 26, 2015. More than 40 people were killed by tornadoes and floods during the holiday season in the United States, where rare winter tornado warnings were issued in Alabama on Monday. Alabama, Mississippi and the Florida panhandle were expected to bear the brunt of the of the day's strongest storms, said AccuWeather senior meteorologist Michael Leseney. As of 5 p.m. EST (2200 GMT), more than 2,400 U.S. flights had been canceled on Monday, according to FlightAware.com, while another 3,700 delays were reported. Chicago-area airports were worst hit with hundreds of flights canceled as the city was swept by sleet and hail. More than a foot (30 cm) of snow was forecast for southwestern Wisconsin and southeastern Minnesota, and snow was also falling in Iowa, Nebraska and Missouri. A flash flood warning was in effect in eastern Missouri and Southern Illinois, the National Weather Service said. Thirteen people died in flash floods in those two states during the weekend. The U.S. storms came as other countries struggled with extreme weather and stressed holiday infrastructure. In Britain, hundreds of troops were deployed and a government agency said a "complete rethink" of flood defenses was needed after swathes of northern England were inundated by rivers that burst their banks. Severe weather also hit parts of Australia, where more than 100 homes were lost in Christmas Day brushfires. Then on Sunday a freight train carrying sulphuric acid derailed in the Outback, and a Queensland Rail spokeswoman told local media that floods had stopped crews reaching the scene. (video: reut.rs/1R3QYwT) The bad U.S. weather caused two candidates for the Republican presidential nomination, New Jersey Governor Chris Christie and U.S. Senator Marco Rubio, to cancel campaign events in Iowa. In Arkansas, a 31-year-old man drowned in a flood-swollen creek about 65 miles northwest of Little Rock, authorities said on Monday. Six tornadoes were reported on Sunday - three in Arkansas, one in Texas, and two in Mississippi. U.S. President Barack Obama, on vacation in Hawaii, called Texas Governor Gregg Abbott on Monday to receive an update and to offer his administration's continued support after weekend tornadoes that killed at least 11 people in the Dallas area and damaged about 1,600 structures and homes. "The President relayed heartfelt condolences on behalf of himself and the First Lady for those who lost their lives and for the many people who lost their homes," Obama's office said in a statement. One twister in the city of Garland, Texas, had winds of up to 200 miles per hour (322 km per hour) and killed eight people, including a 30-year-old woman and her year-old son. "We are very blessed that we didn't have more injuries and more fatalities," Garland's Mayor Douglas Athas told CNN. In the Dallas suburbs of Garland and Rowlett, which were devastated by tornadoes on Saturday, many residents turned to social media to tell stories of survival and to ask for help finding lost pets. Briana Landrum posted a photo of her living room couch surrounded by wreckage where her house once stood in Rowlett. Her two cats are missing, she wrote, and the freezing rain has made searching for her "sweet babies" difficult. "The roof fell on us one second and the next, it was gone," she wrote. "The tornado ripped our world apart."Ten deaths and 58 injuries were reported in Mississippi, and hundreds of homes were damaged, authorities said. One man recounted how a tornado swept his adult son through treetops before dropping him hundreds of feet away. In flooded southern Missouri, dozens of adults and children forced from their homes took refuge at Red Cross shelters. Red Cross spokeswoman Julie Stolting said there was no telling when they might be able to return home. "But we're feeding them, we're sheltering them, we're providing health services," she said. In Oklahoma, Governor Mary Fallin extended a state of emergency for all 77 counties on Monday after freezing rain, ice and sleet left nearly 200,000 homes without power.


News Article | December 29, 2015
Site: www.reuters.com

Neighbors prepare to check out the damage after floods waters entered their business in Elba, Alabama, December 26, 2015. Damage caused by a tornado is seen in a neighborhood in Birmingham, Alabama, December 26, 2015. Law enforcement has the bridge closed while city workers place sand bags on the bridge to stop seepage in Elba, Alabama, December 26, 2015. Neighbours console each other after floods waters entered their business in Elba, Alabama, December 26, 2015. City crews clean up the damage caused by a tornado in a neighborhood in Birmingham, Alabama, December 26, 2015. A house is under water on the banks of the Pea River in Elba, Alabama, December 26, 2015. Traffic goes across the bridge on Alabama hwy 87 at the Pea River in Elba, Alabama, December 26, 2015. Damage caused by a tornado is seen in a neighborhood in Birmingham, Alabama, December 26, 2015. A Sun Country Airlines plane's wing is de-iced as a United Airlines plane waits at the de-icing station during a snowstorm at Logan International Airport in Boston, Massachusetts, United States December 29, 2015. More than 40 people were killed by tornadoes and floods in the United States during the holiday season, where rare winter tornado warnings were issued in Alabama on Monday. Alabama, Mississippi and the Florida panhandle were expected to bear the brunt of the of the day's strongest storms, AccuWeather senior meteorologist Michael Leseney said. About 2,900 flights had been canceled at U.S. airports by 11 p.m. EST on Monday, according to FlightAware.com, while another 4,800 delays were reported. Chicago-area airports were worst hit with hundreds of flights canceled as the city was swept by sleet and hail and United Airlines granted exemptions from fees for some travelers impacted by the storms. More than a foot (30 cm) of snow was forecast for southwestern Wisconsin and southeastern Minnesota, and snow was also falling in Iowa, Nebraska and Missouri. A flash flood warning was in effect in eastern Missouri and Southern Illinois, the National Weather Service said. Thirteen people died in flash floods in those two states during the weekend, including four international soldiers training at a military base in Missouri, the Army said. The storms came as other countries struggled with extreme weather and stressed holiday infrastructure. In Britain, hundreds of troops were deployed and a government agency said a "complete rethink" of flood defenses was needed after swathes of northern England were inundated by rivers that burst their banks. Severe weather also hit parts of Australia, where more than 100 homes were lost in Christmas Day brushfires. Then on Sunday a freight train carrying sulphuric acid derailed in the Outback, and a Queensland Rail spokeswoman told local media that floods had stopped crews reaching the scene. (video: reut.rs/1R3QYwT) The bad weather caused two candidates for the Republican presidential nomination, New Jersey Governor Chris Christie and U.S. Senator Marco Rubio, to cancel campaign events in Iowa. In Arkansas, a 31-year-old man drowned in a flood-swollen creek about 65 miles northwest of Little Rock, authorities said on Monday. Six tornadoes were reported on Sunday - three in Arkansas, one in Texas, and two in Mississippi. U.S. President Barack Obama, on vacation in Hawaii, called Texas Governor Gregg Abbott on Monday to receive an update and to offer his administration's continued support after weekend tornadoes that killed at least 11 people in the Dallas area and damaged about 1,600 structures and homes. One twister in the city of Garland, Texas, had winds of up to 200 miles per hour (322 km per hour) and killed eight people, including a 30-year-old woman and her year-old son. "We are very blessed that we didn't have more injuries and more fatalities," Garland's Mayor Douglas Athas told CNN. In the Dallas suburbs of Garland and Rowlett, which were devastated by tornadoes on Saturday, many residents turned to social media to tell stories of survival and to ask for help finding lost pets. Briana Landrum posted a photo of her living room couch surrounded by wreckage where her house once stood in Rowlett. Her two cats are missing, she wrote, and the freezing rain has made searching for her "sweet babies" difficult. "The roof fell on us one second and the next, it was gone," she wrote. "The tornado ripped our world apart."Ten deaths and 58 injuries were reported in Mississippi, and hundreds of homes were damaged, authorities said. One man recounted how a tornado swept his adult son through treetops before dropping him hundreds of feet away. In flooded southern Missouri, dozens of adults and children forced from their homes took refuge at Red Cross shelters. Four international soldiers receiving training at the Fort Leonard Wood military base drowned when their vehicle was swept into flood waters on Sunday, the Army said in a statement. Their identities and home countries have not yet been released. Red Cross spokeswoman Julie Stolting said there was no telling when displaced people might be able to return home. "But we're feeding them, we're sheltering them, we're providing health services," she said. In Oklahoma, Governor Mary Fallin extended a state of emergency for all 77 counties on Monday after freezing rain, ice and sleet left nearly 200,000 homes without power.


Bagnall T.,Queensland Rail | Imrie I.,Plateway Ltd | Jacob M.,IFB GmbH
eb - Elektrische Bahnen | Year: 2012

Queensland Rail is the Brisbane City network operator and conducted a prove of concept for the railway power supply simulation tool OpenPowerNet. OpenPowerNet runs in co-simulation with the railway operation simulator OpenTrack. The average total energy consumption deviation was with 6.1 % well in the accepted range and made Queensland Rail confi dent to order multiple licenses of the simulation tools.


Pal S.,Cooperative Research Center for Rail Innovation | Pal S.,University of Queensland | Daniel W.J.T.,Cooperative Research Center for Rail Innovation | Daniel W.J.T.,University of Queensland | And 4 more authors.
Engineering Failure Analysis | Year: 2012

A metallurgical investigation was carried out of new AS60 rail samples, subjected to severe wheel slip, which caused skid marks on the rail crown, 10-18. mm wide. Sections, studied using optical and scanning electron microscopy revealed that the surface damage was a white etching layer (WEL). The WEL had a high hardness of 884. HV consistent with martensite. The microstructure was consistent with wheel slip causing severe plastic deformation of the rail surface, and the heat generated caused a transformation to austenite, which was quenched to martensite by the steel of the cold bulk rail extracting heat from the hot surface. The WEL depths in two samples were measured to be between ~230 and 310. μm. This is indicative that there was more heat available in one sample to produce a thicker martensite layer. This is attributed to more intense wheel slip in that rail. © 2012 Elsevier Ltd.


Ahmad S.S.,Central Queensland University | Ahmad S.S.,Center for Railway Engineering | Ahmad S.S.,Cooperative Research Center for Rail Innovation | Mandal N.K.,Central Queensland University | And 6 more authors.
Proceedings of the Institution of Mechanical Engineers, Part F: Journal of Rail and Rapid Transit | Year: 2013

Track buckling is a serious problem for railways. High longitudinal rail stresses contribute to problems such as track buckling, rail joint failure, rail breakage and failure of turnouts. The direct and indirect costs of track buckling problems are very high. The influences of rail temperature, stress-free temperature (SFT) and lateral misalignment of track on track buckling need comprehensive investigation. In this paper, an experimental design comprising strain gauges, thermocouples and rail stress sensors has been implemented on the Queensland Rail heavy haul 60 kg/m rail network. A new creep measurement technique using internal rail stress has been developed. The changes in rail neutral temperature due to the variation of actual rail temperature and the occurrence of rail creep in straight and curved track is quantified. Modes of differences of SFT in the two rails at a location, and of SFT in straight track and in curved track are discussed. The relationship of SFT to rail temperature is also presented. Daily variation in rail temperature due to ambient air temperature is presented. Field trials showed that SFT can vary by 2-3 °C during the day. Based on this finding and the derivation of an equation for change of SFT, an improvement in utilising rail creep measurements for assessing track condition has resulted. This finding suggests that it is possible to determine the SFT throughout a day rather than just a single SFT value. This paper also presents a simple track stability management tool that is based on two major parameters, namely rail stress and track resistance. Each parameter in the tool has been given three levels of value to determine the required preventive measures. Overall, the tool decides the need for speed restriction during hot weather based on the quantified parameters from the field trials and rail standards. © IMechE 2013 Reprints and permissions: sagepub.co.uk/journalsPermissions.nav.


Hallam G.,Queensland Rail
Memoirs of the Queensland Museum: Cultural Heritage Series | Year: 2011

From its beginning in 1864, the area of North Ipswich has had a link with the operation of the railway industry in Queensland. Incorporated into the original workshop location was the first locomotive servicing area for Queensland Railways. In Queensland, major steam locomotive depots tended to be of two designs: a 'through shed' arrangement (similar to the Mayne Depot); and a round turntable, with tracks radiating from a central point, such as the roundhouse found in Rockhampton and at the Ipswich Railway Workshops. The Roundhouse and its running staff at Ipswich were separate from the Workshops, and maintained its own separate identity.


Pal S.,University of Queensland | Valente C.,Queensland Rail | Daniel W.,University of Queensland | Farjoo M.,University of Queensland
Wear | Year: 2012

This paper describes the initiation and propagation behaviour of squat-type cracks in rail steel using mechanical and metallurgical analysis simultaneously. Rails with squat defects were removed from the site and inspected visually, ultrasonically, optically and by using electron microscopy. The contact stresses on a rail from a wheel are critically evaluated and rolling contact fatigue crack direction, initiation and propagation have been evaluated using stress theory and validated with metallurgical observations. The hardness of the rail surface was much higher than that of the adjacent rail matrix and this was comparable with that of a white etching layer. Squats were observed near the white etching layer. The squats formed an angle of 20-30° with the horizontal surface. Ultrasonic testing predicted the actual shape of the squat under the surface. Scanning electron microscopic observation revealed differences in the rolling contact behaviour between the direction of train travel and the opposite direction. Based on metallurgical research, a mechanism for squat initiation and propagation has been proposed in this paper. © 2012 Elsevier B.V. All rights reserved.


Leach S.,Queensland Rail
Australian Journal of Electrical and Electronics Engineering | Year: 2011

This paper proposes a procedure for the testing of in service medium voltage crosslinked polyethylene insulated cables to allow an estimate to be made of their time to failure. © 2011 Institution of Engineers Australia.

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