The Experts below are selected from a list of 62997 Experts worldwide ranked by ideXlab platform
Michael A Erdmann - One of the best experts on this subject based on the ideXlab platform.
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Multiple impacts: A state Transition Diagram approach
The International Journal of Robotics Research, 2012Co-Authors: Yanbin Jia, Matthew T Mason, Michael A ErdmannAbstract:Impact happens when two or more bodies collide, generating very large impulsive forces in a very short period of time during which kinetic energy is first absorbed and then released after some loss. This paper introduces a state Transition Diagram to model a frictionless multibody collision. Each state describes a different topology of the collision characterized by the set of instantaneously active contacts. A change of state happens when a contact disappears at the end of restitution, or when a disappeared contact reappears as the relative motion of two bodies goes from separation into penetration. Within a state, (normal) impulses are coupled differentially subject to relative stiffnesses at the active contact points and the strain energies stored there. Such coupling may cause restart of compression from restitution during a single impact. Impulses grow along a bounded curve with first-order continuity, and converge during the state Transitions. To solve a multibody collision problem with friction and tangential compliance, the above impact model is integrated with a compliant impact model. The paper compares model predictions to a physical experiment for the masse shot, which is a difficult trick in billiards, with a good result.
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a state Transition Diagram for simultaneous collisions with application in billiard shooting
WAFR, 2009Co-Authors: Yanbin Jia, Matthew T Mason, Michael A ErdmannAbstract:This paper models a multibody collision in the impulse space as a state Transition Diagram, where each state represents a phase during which impacts are “active” at only a subset of the contact points. A state Transition happens whenever an active impact finishes restitution, or an inactive impact gets reactivated, depending on whether the two involved bodies are instantaneously penetrating into each other or not. The elastic energy due to an impact is not only affected by the impulse at the corresponding contact point, but also by other impulses exerted on the two involved bodies during the impact. Consequently, Poisson’s impulse-based law of restitution could result in negative energy. A new law governing the loss of elastic energy during restitution is introduced. Convergence of the impulse sequence generated by the state Transition Diagram is established. The collision outcome depends on the ratios of the contact stiffnesses rather than on their individual values. The collision model is then applied in an analysis of billiard shooting in which the cue stick impacts the cue ball, which in turn impacts the pool table. The system is driven by the normal impulses at the two contacts with the tangential impulses determined via a contact mode analysis.
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WAFR - A State Transition Diagram for Simultaneous Collisions with Application in Billiard Shooting
Springer Tracts in Advanced Robotics, 2009Co-Authors: Yanbin Jia, Matthew T Mason, Michael A ErdmannAbstract:This paper models a multibody collision in the impulse space as a state Transition Diagram, where each state represents a phase during which impacts are “active” at only a subset of the contact points. A state Transition happens whenever an active impact finishes restitution, or an inactive impact gets reactivated, depending on whether the two involved bodies are instantaneously penetrating into each other or not. The elastic energy due to an impact is not only affected by the impulse at the corresponding contact point, but also by other impulses exerted on the two involved bodies during the impact. Consequently, Poisson’s impulse-based law of restitution could result in negative energy. A new law governing the loss of elastic energy during restitution is introduced. Convergence of the impulse sequence generated by the state Transition Diagram is established. The collision outcome depends on the ratios of the contact stiffnesses rather than on their individual values. The collision model is then applied in an analysis of billiard shooting in which the cue stick impacts the cue ball, which in turn impacts the pool table. The system is driven by the normal impulses at the two contacts with the tangential impulses determined via a contact mode analysis.
Satoru Miyano - One of the best experts on this subject based on the ideXlab platform.
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time dependent structural transformation analysis to high level petri net model with active state Transition Diagram
BMC Systems Biology, 2010Co-Authors: Chen Li, Masao Nagasaki, Ayumu Saito, Satoru MiyanoAbstract:Background With an accumulation of in silico data obtained by simulating large-scale biological networks, a new interest of research is emerging for elucidating how living organism functions over time in cells. Investigating the dynamic features of current computational models promises a deeper understanding of complex cellular processes. This leads us to develop a method that utilizes structural properties of the model over all simulation time steps. Further, user-friendly overviews of dynamic behaviors can be considered to provide a great help in understanding the variations of system mechanisms.
Sorabh Gupta - One of the best experts on this subject based on the ideXlab platform.
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Stochastic modelling and availability analysis of a critical engineering system
International Journal of Quality & Reliability Management, 2019Co-Authors: Sorabh GuptaAbstract:The purpose of this paper is to present the technique for evaluating the performance of a condensate system of a coal-based thermal power plant situated in the northern part of India. The data which used for system availability evaluation are not precise and are uncertain and, further, collected from concerned power plant history sheets and from discussion through plant personnel.,In the proposed model, traditional Markov birth-death process using a probabilistic approach is used to analyze the performance of a complex repairable condensate system of power plant up to a desired degree of accuracy. This approach has been demonstrated by breaking the condensate system into six subsystems arranged in series with two feasible states, namely, working and failed, labeled in a Transition Diagram and modeled as a Markov process, using Chapman–Kolmogorov equations, which are used for development of a probabilistic stochastic model for availability analysis in a more effecting manner, considering some suitable assumptions.,This study of analysis of reliability and availability can help in increasing the plant production and performance. The analysis is done with the help of availability matrices, which are developed using different combinations of failures and repair rates of all subsystems. To achieve the goal of maximum power generation, it is required to run the various subsystem of the concerned system of plant, failure free for a long duration. Therefore, the present approach may be a more powerful analysis tool to access the performance of all subsystems of a condensate system in terms of availability level achieved in availability matrices. The results of present study are found to be highly beneficial to the plant management for making maintenance decisions.,The present paper suggests a suitable technique for stochastic modeling and availability evaluation of an industrial system using Markovian approach and drawing a Transition Diagram to represent the operational behavior of the system. The present methodology includes the advantage of the ability to model and develop a more complex industrial system and helps in improving the performance and handling the uncertainties and possibilities of an industrial system.
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Simulation Model for Stochastic Analysis and Performance Evaluation of Condensate System of a Thermal Power Plant
Bangladesh Journal of Scientific and Industrial Research, 2010Co-Authors: Sorabh Gupta, P.c. TewariAbstract:This paper discusses the stochastic analysis and performance evaluation of condensate system of a thermal plant. These opportunities will be identified by evaluation of a simulation model to be built for the condensate system. The present system under study consists of six subsystems A, B, C, D, E, and F arranged in series with two feasible states: working and failed. After drawing Transition Diagram, differential equations are generated and then a probabilistic simulated simulation model using Markov approach has been developed considering some assumptions. Performance matrix for each subsystem is also developed, which provide various availability levels. On the basis of this study, performance of each subsystem of condensate system is evaluated and then maintenance decisions are made for subsystems. Key words : Transition Diagram; Markov approach; Performance matrix; Maintenance decisions. DOI: 10.3329/bjsir.v44i4.4587 Bangladesh J. Sci. Ind. Res. 44(4) , 387-398, 2009
Shusuke Okamoto - One of the best experts on this subject based on the ideXlab platform.
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NBiS - Development of IslayPub3.0 - Educational Programming Environment Based on State-Transition Diagrams
2015 18th International Conference on Network-Based Information Systems, 2015Co-Authors: Kazuomi Suzuki, Michitoshi Niibori, Shusuke Okamoto, Adnan Saleh Rashed, Masaru KamadaAbstract:An enhanced version of IslayPub is developed in this study. IslayPub is an educational programming environment available on any browsers capable of HTML5 and JavaScript. Its unique feature is to describe the behavior of automatic characters in terms of state-Transition Diagram visually easy to understand even for children. The former version did not offer the functions of publishing what they created and receiving likes and comments from others. In this paper, we enhance IslayPub to include those two functions which will give more fun and motivation to the children.
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NBiS - IslayTouch: An Educational Visual Programming Environment Based on State-Transition Diagrams that Runs on Android Devices
2015 18th International Conference on Network-Based Information Systems, 2015Co-Authors: Erjing Zhou, Shusuke Okamoto, Masaru Kamada, Michitoshi Niibori, Tatsuhiro YonekuraAbstract:Educational programming languages are programming languages that have been designed for beginners, with the purpose of teaching them the skill of logical thinking or as an introduction to regular programming languages. Although these languages are relatively easier for beginners, difficult concepts of regular programming languages are still being introduced into some of them. As a new approach to this problem, an educational visual programming environment called Islay has been developed. Due to the adoption of the simple concept of state-Transition Diagram, Islay becomes even easier for beginners than some other educational programming languages. In this research, a new version of Islay is developed as an Android application, with more features being added and a new user interface that is suitable for tablet devices.
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NBiS - Interactive Animation Authoring Platform Based on State-Transition Diagrams that Runs on Android Devices
2014 17th International Conference on Network-Based Information Systems, 2014Co-Authors: Erjing Zhou, Shusuke Okamoto, Masaru Kamada, Michitoshi Niibori, Tatsuhiro YonekuraAbstract:An interactive animation is a presentation of moving pictures that behave dynamically according to the input from users. It can be composed of animation characters modeled as finite-state machines. Based on the fact that the behavior of a finite-state machine can be defined by a state-Transition Diagram, an interactive animation authoring tool called Islay has been developed. Islay allows users to create interactive animation simply by drawing state-Transition Diagrams on a GUI-based editor. Up to now Islay mainly runs on the PCs. But we cannot use it on the portable devices that have become popular recently. In this research, a new version of Islay that runs on Android devices is developed with its user interface adapted to the touch screen interface.
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Islay3D—A Programming Environment for Authoring Interactive 3D Animations in Terms of State-Transition Diagram
Journal of Software Engineering and Applications, 2014Co-Authors: Dandy Ling Kwong, Shusuke Okamoto, Masaru Kamada, Michitoshi Niibori, Tatsuhiro YonekuraAbstract:An educational programming language is a programming language that is designed primarily as a learning instrument and not so much as a tool for writing programs for production. Three-dimensional (3D) interactive animations provide an effective means to engage the attention of the audience to learn programming language. Traditionally, creating 3D games had been difficult as it requires specialized programming skills. However, it had been proven that the state-Transition Diagram, which is the most fundamental principle for automata, is intuitively so comprehensive that even children can create programs for interactive animations and video games in the two-dimensional world. Islay3D is a programming environment for authoring interactive 3D animations based on this concept. In this paper, the Islay3D animation language is introduced, where a character is modeled as an object, and its behavior is defined in term of a set of state-Transition Diagrams. The interpretation of the state-Transition Diagrams to JavaScript is also presented. Finally, the web-based programming environment is introduced. With the web-based platform, the public will be able express their creativity in creating interactive 3D animations and video games easily from within their browser.
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islay3d a programming environment for authoring interactive 3d animations in terms of state Transition Diagram
Journal of Software Engineering and Applications, 2014Co-Authors: Dandy Ling Kwong, Shusuke Okamoto, Masaru Kamada, Michitoshi Niibori, Tatsuhiro YonekuraAbstract:An educational programming language is a programming language that is designed primarily as a learning instrument and not so much as a tool for writing programs for production. Three-dimensional (3D) interactive animations provide an effective means to engage the attention of the audience to learn programming language. Traditionally, creating 3D games had been difficult as it requires specialized programming skills. However, it had been proven that the state-Transition Diagram, which is the most fundamental principle for automata, is intuitively so comprehensive that even children can create programs for interactive animations and video games in the two-dimensional world. Islay3D is a programming environment for authoring interactive 3D animations based on this concept. In this paper, the Islay3D animation language is introduced, where a character is modeled as an object, and its behavior is defined in term of a set of state-Transition Diagrams. The interpretation of the state-Transition Diagrams to JavaScript is also presented. Finally, the web-based programming environment is introduced. With the web-based platform, the public will be able express their creativity in creating interactive 3D animations and video games easily from within their browser.
Said Jahanmir - One of the best experts on this subject based on the ideXlab platform.
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Wear Transition Diagram for silicon carbide
Tribology International, 1995Co-Authors: X. Dong, Said Jahanmir, L.k. IvesAbstract:Abstract To obtain information on the tribological behaviour of silicon carbide at elevated temperatures, unlubricated ball-on-flat wear tests were conducted on sintered silicon carbide in self-mated sliding in air. The contact load was varied from 3.2 to 98.0 N, and a temperature range of 23°C to 1000°C was used. Scanning electron microscopy, Fourier transform infrared spectroscopy and energy-dispersive spectroscopy were used to elucidate the wear mechanisms. The results of the tests and observations were employed to construct a wear Transition Diagram, which provides a summary of tribological information including friction coefficient, wear coefficient and wear mechanisms as a function of temperature and load. The wear Transition Diagram for the sintered silicon carbide studied is divided into four regions plus one Transition zone. At room temperature, under high loads and high environmental humidity, the tribological behaviour is controlled by tribochemical reactions between the silicon carbide surface and water vapour in the environment. Under low loads and at temperatures below 250°C, wear occurs by ploughing and polishing. At temperatures about 250°C and under low loads, tribooxidation and formation of cylindrical wear particles control the tribological behaviour. Wear occurs by microfracture when the load is increased above a critical value; and both the friction coefficient and the wear coefficient increase.
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Wear Transition Diagram for silicon nitride
Wear, 1993Co-Authors: X. Dong, Said JahanmirAbstract:Abstract Utilization of silicon nitride ceramics in applications involving contact between two sliding surfaces requires information on the effect of contact conditions and materials microstructure on tribological performance. In the present study, unlubricated wear tests were conducted on a hot isostatically-pressed silicon nitride under various test conditions in self-mated sliding tests in air. Following the tests, scanning electron microscopy (SEM) was used to elucidate the wear mechanisms and particularly to delineate the effects of load and temperature on wear. The results of the tests and observations were used to construct a wear Transition Diagram, with load and temperature as the two axes. This Diagram is divided into five regions plus one Transition zone. The controlling mechanism and tribological data, i.e. friction coefficient and wear coefficient, in each region are unique. At low loads and relatively low temperatures, the tribological behavior is controlled by tribochemical reactions between silicon nitride surface and water vapor in the environment. In the temperature range 400–700°C at low loads, selective oxidation of WC inclusions controls the wear behavior. Formation of crystalline precipitates from the amorphous magnesium silicate grain boundary phase controls the wear process from 700 to 900°C at low loads. At higher temperatures, oxidation of silicon nitride dominates the wear process. A Transition to severe wear by micro-fracture is observed as the contact load is increased above a particular value. Detailed understanding of the fundamental mechanisms can provide guidelines for microstructural modifications to avoid severe wear under operating conditions.
