Relevant bibliographies by topics / Diving- Computer simulation

Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers

Academic literature on the topic 'Diving- Computer simulation'

Author: Grafiati
Published: 19 February 2023

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Journal articles on the topic "Diving- Computer simulation"

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Tomlinson, S. P., J. K. W. Lo, and D. G. Tilley. "Computer Simulation of Human Interaction with Underwater Breathing Equipment." Proceedings of the Institution of Mechanical Engineers, Part H: Journal of Engineering in Medicine 208, no. 4 (December 1994): 249–61. http://dx.doi.org/10.1243/pime_proc_1994_208_295_02.

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A mathematical model of the human respiratory system is being developed in order to simulate manned diving operations using various types of breathing equipment. A simulation study is presented of a human diving to a depth of 50 m, using a semi-closed re-breathing system with two different oxygen flow settings. A gas supply with 32.5 per cent oxygen concentration results in a safe dive whereas a 60 per cent setting indicates a dangerous diving condition. Typical respiratory model input data are illustrated for the lung, together with dimensional details for the re-breathing counterlung. The simulation results show variations in alveolar and pleural pressures, gas concentrations and partial pressures in the equipment and in the human respiratory system.
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Fitz-Clarke, John R. "Computer simulation of human breath-hold diving: cardiovascular adjustments." European Journal of Applied Physiology 100, no. 2 (February 24, 2007): 207–24. http://dx.doi.org/10.1007/s00421-007-0421-z.

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Hou, Zhi Hong. "Explore the Process of Computer Sports Simulation." Applied Mechanics and Materials 687-691 (November 2014): 1178–81. http://dx.doi.org/10.4028/www.scientific.net/amm.687-691.1178.

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Computer simulation in sport sports field has broad application prospects in recent years, has been successfully applied such as diving, gymnastics, trampoline, weightlifting and other sports items. This paper summarizes the research status by computer modeling, analysis of the characteristics and scope of several major modeling methods, to further explore the process of establishing sports computer simulation system.
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Yeadon, Maurice R., Pui W. Kong, and Mark A. King. "Parameter Determination for a Computer Simulation Model of a Diver and a Springboard." Journal of Applied Biomechanics 22, no. 3 (August 2006): 167–76. http://dx.doi.org/10.1123/jab.22.3.167.

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This study used kinematic data on springboard diving performances to estimate viscoelastic parameters of a planar model of a springboard and diver with wobbling masses in the trunk, thigh, and calf segments and spring dampers acting at the heel, ball, and toe of the foot segment. A subject-specific angle-driven eight-segment model was used with an optimization algorithm to determine viscoelastic parameter values by matching simulations to four diving performances. Using the parameters determined from the matching of a single dive in a simulation of another dive resulted in up to 31% difference between simulation and performance, indicating the danger of using too small a set of kinematic data. However, using four dives in a combined matching process to obtain a common set of parameters resulted in a mean difference of 8.6%. Because these four dives included very different rotational requirements, it is anticipated that the combined parameter set can be used with other dives from these two groups.
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Hou, Donglei. "Research on the Diving Simulation System on Three Dimensional Computer Animation." International Journal of Signal Processing, Image Processing and Pattern Recognition 9, no. 12 (December 31, 2016): 271–80. http://dx.doi.org/10.14257/ijsip.2016.9.12.26.

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Cai, Zheng Jie. "Review on Application of Virtual Reality in the Physical Simulation." Applied Mechanics and Materials 644-650 (September 2014): 3390–93. http://dx.doi.org/10.4028/www.scientific.net/amm.644-650.3390.

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VRT (Virtual Reality Technology) can simulate the real world dynamically by computer hardware and software to construct and experience artificia1 world.It can produce the dynamic environment to answer synchronically the gestures and language orders of users and make users and artificia1 world construct the synchrona1 and interactive relationship.In recent years,VRT has been used widely in the field of sports such as diving,gymnastics,trampoline,weightlifting,golf,basketball and skiing,especially at diving and trampoline.1. VRT (Virtual Reality Technology)
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Langbeheim, Elon, and Sharona T. Levy. "Diving into the particle model: Examining the affordances of a single user participatory simulation." Computers & Education 139 (October 2019): 65–80. http://dx.doi.org/10.1016/j.compedu.2019.05.006.

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Wells, Richard P., Patrick J. Bishop, and Malcolm Stephens. "Neck Loads during Head-First Collisions in Ice Hockey: Experimental and Simulation Results." International Journal of Sport Biomechanics 3, no. 4 (November 1987): 432–42. http://dx.doi.org/10.1123/ijsb.3.4.432.

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Spinal cord trauma due to head-first collisions is not uncommon in vehicle accidents, shallow water diving, football, or ice hockey. Two approaches to evaluating potential protective devices for ice hockey are described: an evaluative tool based upon an anthropometric test dummy, and a computer simulation of axial head-first collisions. Helmets reduced the peak cervical spine loads during low velocity head-first collisions by up to 8%. It is shown that large thicknesses of appropriate padding are necessary to hold the cervical spine loads to noninjurious levels. A head-first impact of 3.0 m • sec−1required padding deformations on the order of 94 mm to hold cervical spine loads below 2,000 N.
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Hou, Jiao Yi, Wei Feng Zou, Da Yong Ning, and Yong Jun Gong. "Numerical Simulation and Experimental Verification of Phase Change Buoyancy Control System." Applied Mechanics and Materials 906 (April 29, 2022): 59–66. http://dx.doi.org/10.4028/p-c90z80.

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Phase change buoyancy control systems (PBCS) driven by phase change materials have unique advantages over conventional hydraulically actuated buoyancy control systems, especially in their high adaptability for deep-sea exploration and seamless interaction with humans. Studying the heat transfer process and working mechanism of PBCS is helpful to research the precise control mode of the phase change buoyancy regulation system. In this study, we chose paraffin wax as the phase change material for PBCS. A buoyancy generator for phase change buoyancy regulation is designed and manufactured. By studying the relation between its expansion volume and heating time and heat input, the mathematical model of the volume change of PBCS is established. We obtain the calculation results of the PBCS working process by using the computer-aided software MATLAB. Experimental results show that the theoretical volume expansion velocity and volume expansion rate of paraffin are almost consistent with the experimental results. The mathematical calculation model is available and has a significant reference value for further research on the theoretical basis of the diving depth control of PBCS.
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Krasnodubets, L. A. "Multi-purpose information-measuring system for vertical profiling of the ocean environment." Monitoring systems of environment, no. 1 (March 25, 2021): 54–60. http://dx.doi.org/10.33075/2220-5861-2021-1-54-60.

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On the basis of a mathematical description of the processes of measuring the vertical profile of the density of the oceanic environment using a diving offshore autonomous probe – a profiler equipped with an onboard navigation system, a structure and a computer model of a multipurpose information-measuring system is proposed, which is intended for use in operational oceanology. The proposed system forms arrays of measurements of vertical profiles in situ of the density of seawater and its increment, as well as the speed of sound as functions of hydrostatic pressure, obtained during one sounding. At the same time, arrays of complete and thermohaline vertical stability of water layers, as well as the corresponding vertical distributions of the Väisälä-Brunt frequency of thermohaline oscillations in the stratified ocean environment, are formed almost in parallel. In the course of the simulation, an original model of the immersion of an autonomous marine probe in stratified sea water was used, as well as a dynamic model for measuring the trajectory parameters of its movement, taking into account the inertial properties of the acceleration and pressure sensors used. As an object of measurements, we used a simulation model of the ocean environment with vertical density stratification and the corresponding speed of sound in seawater, developed on the basis of real data of profile measurements obtained from specific hydrological stations. The verification of the models of the dynamic measurement processes was carried out by the method of computer simulation in the MATLAB & Simulink environment based on the comparison between the simulation results and available results from the hydrological stations. The illustrations of the results of computer simulation are presented.
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Dissertations / Theses on the topic "Diving- Computer simulation"

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Kong, Pui W. "Computer simulation of the takeoff in springboard diving." Thesis, Loughborough University, 2005. https://dspace.lboro.ac.uk/2134/9051.

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A computer simulation model of a springboard and a diver was developed to investigate diving takeoff techniques in the forward and the reverse groups. The springboard model incorporated vertical, horizontal and rotational movements based on experimental data. The diver was modelled as an eight-segment link system with torque generators acting at the metatarsal-phalangeal, ankle, knee, hip and shoulder joints. Wobbling masses were included within the trunk, thigh and shank segments to allow for soft tissue movement. The foot-springboard interface was represented by spring-dampers acting at the heel, ball and toes of the foot. The model was personalised to an elite diver so that simulation output could be compared with the diver's own performance. Kinematic data of diving performances from a one-metre springboard were obtained using high speed video and personalised inertia parameters were determined from anthropometric measurements. Joint torque was calculated using a torque / angle / angular velocity relationship based on the maximum voluntary torque measured using an isovelocity dynamometer. Visco-elastic parameters were determined using a subject-specific angledriven model which matched the simulation to the performance in an optimisation process. Four dives with minimum and maximum angular momentum in the two dive groups were chosen to obtain a common set of parameters for use in the torque-driven model. In the evaluation of the torque-driven model, there was good agreement between the simulation and performance for all four dives with a mean difference of 6.3%. The model was applied to optimise for maximum dive height for each of the four dives and to optimise for maximum rotational potential in each of the two dive groups. Optimisation results suggest that changing techniques can increase the dive height by up to 2.0 cm. It was also predicted that the diver could generate rotation almost sufficient to perform a forward three and one-half somersault tuck and a reverse two and one-half somersault tuck.
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Preston, Shane. "Dynamic modelling and optimisation aspects of take-off mechanics in aquatic sports." Thesis, Federation University Australia, 1997. http://researchonline.federation.edu.au/vital/access/HandleResolver/1959.17/164941.

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Sayyah, Mohsen. "Variability and control in springboard diving." Thesis, Loughborough University, 2017. https://dspace.lboro.ac.uk/2134/33552.

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Elite springboard divers typically make very precise and reproducible movements when they perform the same dive many times. However, variability is always present in both technique and outcome. While it is desirable to have low outcome variability this may necessitate real-time adjustments which result in increased technique variability from trial to trial. The aim of the present research was to determine whether feedback control adjustment is used during (a) the hurdle takeoff, (b) the dive takeoff, and (c) the dive flight phase. 15 forward pike dives and 15 forward 21⁄2 somersault pike dives, performed by an international diver, were video recorded at 250 Hz and manually digitised followed by DLT reconstruction of joint centre locations. Orientation angle and joint angles were calculated and fitted with quintic splines to give angular velocities. Foot placements, mass centre location and velocity were determined along with angular momentum about the mass centre. In the hurdle takeoff no adjustment was made to reduce the variability in the foot location at hurdle landing. In the dive takeoff phase an angle-driven simulation model was used to determine the expected variation in mass centre velocity and angular momentum at the instant of takeoff arising from the variation in velocity and angular momentum at touchdown. The simulated variation at the instant of takeoff was greater than the variation in the recorded performances indicating that some adjustment had been made during the takeoff phase. In the flight phase an angle-driven simulation model was used to determine the expected variation in orientation angle at water entry arising from the variation in velocity and angular momentum at takeoff. The variation in the orientation angle at entry obtained from the simulations was greater than the variability in the actual performances, indicating that the diver had used feedback control adjustments in the flight phase to reduce his performance outcome variability. The variation in the angular momentum at takeoff was reflected in the average hip angle in flight, indicating that the hip angle was adjusted to be larger to compensate when the initial angular momentum was greater. The use of feedback control adjustments found in this study demonstrated that variability has a functional role in human movement.
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Erickson, R. Scott, and University of Lethbridge Faculty of Education. "Effects of a hypertext-based simulation in high school scuba instruction." Thesis, Lethbridge, Alta. : University of Lethbridge, Faculty of Education, 1993, 1993. http://hdl.handle.net/10133/58.

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A study was conducted to investigate the effects of a hypertext - based computer simulation on the knowledge, skills and attitudes of students participating in a high school scuba program in Edmonton, Alberta. The study compared two groups of students: one which used the simulation as a supplementary (laboratory-type) activity, and another which was taught using traditional methods. The two groups received an equal amount of instrutional time. The simulation and non-simulation groups were found to be equilvalent at the beginning of the study with respect to age, gender, previous diving experience, previous computer experience, attitude toward computers and attitude toward diving. After instruction, the simulation and non-simulation groups were examined for differences with respect to knowledge, attitudes and behaviour, using the following measurement instruments: Knowledge: Marks from students' certification examinations were used as a measure of general diving knowledge. Attitudes: Students were post-surveyed for attitudes toward diving using a locally developed attitude scale. Behavior: Students were evaluated using a locally developed skills assessment to determine their degree of proficiency at out-of-air emergency skills. Reliability estimates for the locally developed instruments were .86, .88 and .93 for the diving attitude, computer attitude and out-of-air skills instruments, respectively. A series of t-test comparisons revealed no significant differences (p<.05) between simulation and non-simulation groups with respect to knowledge, skills and attitudes. The relationships between knowledge, skills and attitudes were examined using Pearson's correlation coefficient, and a significant (p<.01) positive correlation was found between the knowledge and skill measures, with r=0.69. A "diversion index" (DI=# of non-ideal cards in attempt/total # of cards in attempt) was calculated for each attempt made by each student on each of the scenarios. A pattern in diversion indices was revealed, and generalized into a model consisting of four stages: discovery, refinement, solution and exploration. This model is suggested as one way students may approach simulation learning. Six volunteers were interviewed to determine students' opinions regarding the effects of the simulation. Students stated that the simulation helped with the development of in-depth knowledge about out-of-air emergencies, but not with the development of out-of-air emergency skills. Students said that they liked the simulation and enjoyed using it. Implications of the study are discussed with emphasis on research methodology, diver education, and environmental education, and a number of suggestions for future research are offered.
xi, 142 leaves : ill. ; 29 cm.
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Lowe, Graham. "Computer simulation in initial teacher education : a bridge across the faculty/practice divide or simply a better viewing platform?" Thesis, University of Nottingham, 2011. http://eprints.nottingham.ac.uk/12101/.

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This thesis reports on a mixed methods research project into the emerging area of computer simulation in Initial Teacher Education (ITE). Some areas where simulation has become a staple of initial or ongoing education and training, i.e. in health care and military applications, are examined to provide a context. The research explores the attitudes of a group of ITE students towards the use of a recently developed simulation tool and in particular considers the question of whether they view computer simulation as a ‘third place’ between faculty based ‘theory’ elements and school based ‘practice’ elements of their training or whether they consider the simulation to be enhanced ‘theory’ learning. Data from pre-experience and post-experience questionnaires are compared. A series of indicative case studies, representing positive and negative changes in attitude, are presented from data collected using semi-structured interviews. A range of themes emerge indicating that the students’ attitudes towards computer simulation are complex and not based on single factors such as the fidelity of the simulation presented. A major finding of the research is that students’ attitudes towards the computer simulation appear to reflect deep seated views of teaching and learning unrelated to simulation. Indications are that if future use of simulation is to be effective then designers must pay at least as much attention to emotional impact as cognitive development. Evaluation of the success of the study is included and suggestions for further study are made.
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Hu, Hai-Tao. "Diagramme de Voronoi généralisé pour un ensemble de polygones : algorithmes, réalisation et application en analyse de formes." Phd thesis, 1991. http://tel.archives-ouvertes.fr/tel-00339655.

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Books on the topic "Diving- Computer simulation"

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Kenis, William. OECD divine element 1: Accelerated dynamic pavement testing. McLean, Va: U.S. Dept. of Transportation, Federal Highway Administration, Research, Development, and Technology, Turner Fairbank Highway Research Center, 1998.

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Book chapters on the topic "Diving- Computer simulation"

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Kim, Donghyun, Jae-Ryul Shin, and Hwang-Hui Jeong. "A Study of FDS Computational Performance in Heterogeneous Hardware Architectures -Applied for grassland fires." In Advances in Forest Fire Research 2022, 494–97. Imprensa da Universidade de Coimbra, 2022. http://dx.doi.org/10.14195/978-989-26-2298-9_76.

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Fire Dynamic Simulator (FDS), a fire simulation program, applies Message Passing Interface (MPI) and Open Multi Processing (OpenMP) libraries for large-scale simulation. FDS can be executed by dividing simulation problems in a computing cluster using MPI. The main point is to divide the entire domain to be interpreted into several sub-domains and allow each sub-domain to be calculated by an individual computer with an individual processor. When performing parallel computation, FDS first decomposes each sub-domain, then supports two-step parallelization in which multi-threading is applied within each sub-domain, and uses the OpenMP library to implement multi-threading. In this study, OpenACC, a parallelization technique capable of using heterogeneous hardware architectures, was partially applied to FDS. As an application problem, the calculation performance is evaluated through CSIRO Grassland Fires, a verification case of FDS. The hardware for evaluation was a personal computer consisting of dual Xeon 2678-V3 and GeForce GTX 1070. The FDS source code applies OpenACC using PGI Fortran as a compiler in Linux environments. In calculation performance, calculations using CPU and GPU together show 1.89 times faster performance than calculations using a single CPU. In case of using 1 GPU and 16 CPUs (MPP + OpenACC), the analysis result is 21 times faster. In this regard, analysis of grassland fire of WFDS was performed.
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Lenhard, Johannes. "Introduction." In Calculated Surprises, 1–14. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780190873288.003.0001.

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The chapter provides a brief overview of the history of simulation modeling and of philosophical accounts dealing with simulation. Computer and simulation modeling, it is stated, do form a new exploratory and iterative type of mathematical modeling. Four aspects are introduced: experiment and artificiality, visualization, plasticity, and epistemic opacity. The key thesis is that the novelty of simulation modeling rests on how these aspects are combined into a combinatorial style of reasoning. The computer as an instrument does not only speed up calculations but also channels mathematical modeling. This is exerting transformational power on central concepts like solution, validation, and the real—instrumental divide.
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Flanagan, Patrick. "Digital Divide." In Advanced Methodologies and Technologies in Artificial Intelligence, Computer Simulation, and Human-Computer Interaction, 737–48. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7368-5.ch055.

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Since 1991, when the world wide web (WWW) was first made available to the public, it has revolutionized the way the global community engages each other economically, politically, and socially. Its impact has been historically unprecedented. While the availability of and access to the WWW appears to be ubiquitous, it is not. The expansion of this marvelous information communication technology (ICT) has not penetrated certain areas of the world resulting in a “digital divide.” This chapter discusses this digital divide. It first defines the term and then it moves to discuss the origins of the term. From there, the chapter moves to present concrete evidence of how the digital divide has negatively impacted the global community. Finally, it names and evaluates the efforts of different organizations and agencies to resolve the digital divide. It concludes with a prospectus on the future challenges of information communication technology vis-à-vis the digital divide.
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Vargas, Maria A., Gerit Niggemann, and Georg Fieg. "Dynamic Modeling and Simulation of Dividing-Wall Distillation Column Systems." In Computer Aided Chemical Engineering, 639–44. Elsevier, 2009. http://dx.doi.org/10.1016/s1570-7946(09)70327-x.

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Ferro, Enrico, Michele Osella, Yannis Charalabidis, and Euripides Loukis. "Policy Gadgets for Urban Governance in the Era of Social Computing." In Advances in Electronic Government, Digital Divide, and Regional Development, 303–18. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-4169-3.ch015.

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The chapter introduces the concept of policy gadgets that may be expressed as the combined use of computer simulations and social media in policymaking. Such a concept is exemplified by providing the description of an Italian campaign on telemedicine, launched by the regional government of Piedmont (IT) in the context of an international research project named PADGETS (www.padgets.eu). In addition, some preliminary results are presented, which are very encouraging. The use of such instruments in urban and regional policymaking may generate significant advantages in terms of conveying society’s inputs to policy makers, by providing them with a set of concise, fresh, and relevant data in a cost effective and easily understandable way.
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Vargas, Maria A., and Georg Fieg. "Simulation study of alternatives for the efficient start-up of dividing-wall distillation column sequences." In Computer Aided Chemical Engineering, 750–54. Elsevier, 2012. http://dx.doi.org/10.1016/b978-0-444-59507-2.50142-6.

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Cai, Tianxing. "Geospatial Technology-Based E-Government Design for Environmental Protection and Emergency Response." In Advances in Electronic Government, Digital Divide, and Regional Development, 157–84. IGI Global, 2014. http://dx.doi.org/10.4018/978-1-4666-4900-2.ch009.

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Fast development of geospatial technologies has made it possible to integrate existing user operational information and value-added services in a single harmonized infrastructure. This has made it possible to utilize geospatial technologies in the e-Government context. The emerging technologies have made it possible for natural disaster monitoring and mitigation for early warning in order for effective actions under emergency situation, such as natural disaster and chemical accident, to be taken. Natural disasters may include fires, explosions, leakages, or releases of toxic or hazardous materials that can cause people illness, injury, disability, or death. With emerging geospatial technology capabilities and applications such as Google Earth, GIS, and GPS, computer modeling and simulation can provide the inverse identification of emission profile and location. The modeling result can further present the forward prediction of the likely impact of any disaster event. Therefore, the community can acquire the situation in time to form spontaneous emergency response planning, which will also help the other stakeholders such as government and responsible community team. This modeling tool can form a virtual e-Government solution requisite for effective monitoring and mitigation. This chapter highlights the current research trends and future prospects with regards to integrating technologies for managing spatio-temporal information with e-Government conceptualization.
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Leal, João R., Andrey Romanenko, and Lino O. Santos. "Modeling and nonlinear MPC of a dividing-wall column for separation of Benzene-Toluene-p-Xylene: a simulation case study." In Computer Aided Chemical Engineering, 1615–20. Elsevier, 2017. http://dx.doi.org/10.1016/b978-0-444-63965-3.50271-3.

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Lopez-Saucedo, Edna Soraya, Juan Gabriel Segovia-Hernandez, Ignacio E. Grossmann, and Salvador Hernandez-Castro. "Rigorous Modeling, Simulation and Optimization of a Dividing Wall Batch Reactive Distillation Column: A comparative study." In 12th International Symposium on Process Systems Engineering and 25th European Symposium on Computer Aided Process Engineering, 653–58. Elsevier, 2015. http://dx.doi.org/10.1016/b978-0-444-63578-5.50104-3.

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Conference papers on the topic "Diving- Computer simulation"

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Zhonghua, Jia, Tao Yang, Wang Yunliang, Liu Wenlin, and Gao Yong. "The plane s diving maneuvering characteristics simulation in vertical surface." In International Conference on Logistics Engineering, Management and Computer Science (LEMCS 2014). Paris, France: Atlantis Press, 2014. http://dx.doi.org/10.2991/lemcs-14.2014.221.

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Ayral, Thomas, Francois-Marie Le Regent, Zain Saleem, Yuri Alexeev, and Martin Suchara. "Quantum Divide and Compute: Hardware Demonstrations and Noisy Simulations." In 2020 IEEE Computer Society Annual Symposium on VLSI (ISVLSI). IEEE, 2020. http://dx.doi.org/10.1109/isvlsi49217.2020.00034.

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Malczyk, Paweł, and Janusz Fra¸czek. "Parallel Efficiency of Lagrange Multipliers Based Divide and Conquer Algorithm for Dynamics of Multibody Systems." In ASME 2011 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/detc2011-47827.

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Efficient dynamics simulations of complex multibody systems are essential in many areas of computer aided engineering and design. As parallel computing resources has become more available, researchers began to reformulate existing algorithms or to create new parallel formulations. Recent works on dynamics simulation of multibody systems include sequential recursive algorithms as well as low order, exact or iterative parallel algorithms. The first part of the paper presents an optimal order parallel algorithm for dynamics simulation of open loop chain multibody systems. The proposed method adopts a Featherstone’s divide and conquer scheme by using Lagrange multipliers approach for constraint imposition and dependent set of coordinates for the system state description. In the second part of the paper we investigate parallel efficiency measures of the proposed formulation. The performance comparisons are made on the basis of theoretical floating-point operations count. The main part of the paper is concetrated on experimental investigation performed on parallel computer using OpenMP threads. Numerical experiments confirm good overall efficiency of the formulation in case of modest parallel computing resources available and demonstrate certain computational advantages over sequential versions.
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Yuhuan Cui, Jingguo Qu, Weili Chen, and Aimin Yang. "Divide and conquer algorithm for computer simulation and application in the matrix eigenvalue problem." In 2009 International Conference on Test and Measurement (ICTM). IEEE, 2009. http://dx.doi.org/10.1109/ictm.2009.5412930.

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Lemley, Evan C., Dimitrios V. Papavassiliou, and Henry J. Neeman. "Simulations to Determine Laminar Loss Coefficients in Arbitrary Planar Dividing Flow Geometries." In ASME/JSME 2007 5th Joint Fluids Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/fedsm2007-37268.

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The goal of this study is to determine laminar stagnation pressure loss coefficients for planar dividing flow. These losses are of clear interest in understanding flow in microfluidic devices, in porous media, or other complicated laminar pore networks. There is no published set of pressure loss coefficients for arbitrary bifurcation geometries that occur in these networks. Additionally, the small number of bifurcation geometries that have been studied are for turbulent flow often found in fluid supply and drain systems. The pressure loss coefficients determined in this study allow realistic simulation of existing laminar flow networks or the design of these networks. This study focuses on a single inlet duct with two outlet ducts, which were allowed to vary in diameter, flow fraction, and angle — all relative to the inlet duct. Laminar stagnation pressure loss coefficients have been determined by simulating incompressible flow through 600 different geometries. In all cases, the flow is laminar in the inlet and outlet ducts. Simulations of the dividing flow geometries were done using FLUENT and a custom written computer code, which automates the process of creating flow geometries, of creating FLUENT input files, and of parsing FLUENT output. The outputs, pressure and velocity distributions at the inlet and outlets, have been averaged and then used to calculate pressure loss coefficients for each of the geometries and flow fraction scenarios simulated. The results for loss coefficient for the geometries considered range from 0.15 to 49. The loss coefficient for any geometry increases significantly as the flow fraction increases and as the duct size of an outlet duct relative to the inlet duct decreases. Less significant variation of the loss coefficient has been observed as a function of the angles of the exit ducts.
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Khan, Imad M., and Kurt S. Anderson. "Divide-and-Conquer-Based Large Deformation Formulations for Multi-Flexible Body Systems." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12218.

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In the dynamic modeling and simulation of multi-flexible-body systems, large deformations and rotations has been a focus of keen interest. The reason is a wide variety of application area where highly elastic components play important role. Model complexity and high computational cost of simulations are the factors that contribute to the difficulty associated with these systems. As such, an efficient algorithm for modeling and simulation of systems undergoing large rotations and large deflections may be of great importance. We investigate the use of absolute nodal coordinate formulation (ANCF) for modeling articulated flexible bodies in a divide-and-conquer (DCA) framework. It is demonstrated that the equations of motion for individual finite elements or elastic bodies, as obtained by the ANCF, may be assembled and solved using a DCA type method. The current discussion is limited to planar problems but may easily be extended to spatial applications. Using numerical examples, we show that the present algorithm provides an efficient and robust method to model multibody systems employing highly elastic bodies.
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Khan, Imad M., Woojin Ahn, Kurt Anderson, and Suvranu De. "Multi-Flexible-Body Simulations Using Interpolating Splines in a Divide-and-Conquer Scheme." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-12217.

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A new method for modeling multi-flexible-body systems is presented that incorporates interpolating splines in a divide-and-conquer scheme. This algorithm uses the floating frame of reference formulation and piece-wise interpolation spline functions to construct and solve the non-linear equations of motion of the multi-flexible-body systems undergoing large rotations and translations. We compare the new algorithm with the flexible divide-and-conquer algorithm (FDCA) that uses the assumed modes method and may resort to sub-structuring in many cases [1]. We demonstrate, through numerical examples, that in such cases the interpolating spline-based approach is comparable in accuracy and superior in efficiency to the FDCA. The algorithm retains the theoretical logarithmic complexity inherent to the divide-and-conquer algorithm when implemented in parallel.
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Khan, Imad M., Mohammad Poursina, Jeremy Laflin, and Kurt Anderson. "A Framework for Adaptive Multibody Modeling of Biopolymers." In ASME 2013 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/detc2013-13085.

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Due to the challenges involved with modeling complex molecular systems, it is essential that computationally intelligent schemes be produced that put the computational effort where and when it is needed to capture important phenomena, and maintain needed accuracy at minimum costs. In this work, we investigate and propose some key issues for the adaptive modeling and simulation of the dynamic behavior of highly complex multiscale processes. This is accomplished through the appropriate use of an adaptive hybridization of existing, newly developed, and proposed advanced multibody dynamics algorithms and modeling strategies for forward dynamic simulation. The adaptive multiscale simulation technique discussed here benefits from the highly parallelizable structure of the divide and conquer (DCA) framework for modeling multibody systems. These algorithms include Flexible Divide and Conquer Algorithm (FDCA), Orthogonal Complement Divide-and-Conquer Algorithm (ODCA) and generalized momentum approaches for modeling discontinuous changes in the system. These algorithms permits a large complex molecule (or systems of molecules) to be seamlessly treated using a hierarchy of reduced order models ranging from atomistic to the continuum scale.
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Khan, Imad M., and Kurt S. Anderson. "Efficient Large Deformation Simulations of Multi-Flexible-Body Systems Using Absolute Nodal Coordinate Beam and Plate Elements." In ASME 2014 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/detc2014-34974.

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In this paper, we investigate the absolute nodal coordinate finite element (FE) formulations for modeling multi-flexible-body systems in a divide-and-conquer framework. Large elastic deformations in the individual components (beams and plates) are modeled using the absolute nodal coordinate formulation (ANCF). The divide-and-conquer algorithm (DCA) is utilized to model the constraints arising due to kinematic joints between the flexible components. We develop necessary equations of the new algorithm and present numerical examples to test and validate the method.
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Bish, Jack, Terence Honikman, Jason Sigel, Carl Nash, and Donald Friedman. "Human Response to Dynamic Rollover Conditions." In ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43071.

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To date, human responses in motor vehicle rollover accidents have been studied through the use of Hybrid III dummies in dolly vehicle rollover tests, quasi-static spit tests where the vehicle and occupant are rotated slowly about the rotation axis of the spit fixture, computer simulations and vehicle drop tests. To demonstrate human responses to dynamic rollover conditions more accurately we designed and built a fixture to accommodate a passenger compartment in a hoop structure that rotates as it translates. The rotational axis of the hoop structure is offset from the rotational axis of the passenger compartment to replicate vehicle center of gravity motion seen in dolly rollover tests. Testing showed the difference in restraint behavior depending upon whether the occupant was seated on the near (initially leading) or far side. It demonstrated that human and Hybrid III dummy neck response is very different. The human test subject received no injuries from diving into the roof of the passenger compartment even though this is the predicted injury mechanism reported in several technical papers.
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