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Статті в журналах з теми "Flashing error"
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Hirsch, Peter Buell. "The flashing of fireflies." Journal of Business Strategy 37, no. 3 (May 16, 2016): 52–56. http://dx.doi.org/10.1108/jbs-03-2016-0023.
Повний текст джерелаАнотація:
Purpose This paper aims to identify the characteristics of enduring audience engagement through social media. Design/methodology/approach The approach is to examine recent examples of successful social media practices to identify common characteristics. Findings The most common characteristics of successful social media engagement include continuous beta, co-ownership, room for error and convenor-ship. Originality/value The author’s analogy of successful social media to the biophysical phenomenon of entrainment is an original insight into social engagement.
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Elias, E., and P. L. Chambre´. "Flashing Inception in Water During Rapid Decompression." Journal of Heat Transfer 115, no. 1 (February 1, 1993): 231–38. http://dx.doi.org/10.1115/1.2910654.
Повний текст джерелаАнотація:
A phenomenological model is presented for predicting the thermodynamic conditions at the onset of flashing in liquid undergoing a static or flow depressurization transient. It is shown that at extremely high rates of decompression (pulse expansion), a liquid may reach the homogeneous nucleation limit of superheat before appreciable phase transition occurs. A criterion for pulse expansion is derived by an asymptotic solution of the mass and energy equations in conjunction with the equation for spontaneous bubble nucleation and growth near the flashing inception point. The effect of impurities and dissolved gases is considered by an empirically defined heterogeneous nucleation coefficient. The model predicts the minimum pressure at the flashing point with a probable error of less than 11 percent, using 83 experimental data points.
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Luria, Saul M., and James S. Newacheck. "The Effect of Defocussing the Image on the Perception of the Temporal Order of Flashing Lights." Perception 21, no. 3 (June 1992): 359–63. http://dx.doi.org/10.1068/p210359.
Повний текст джерелаАнотація:
The temporal interval between flashing lights that is required to perceive nonsimultaneity decreases as the refractive error increases from 0 to +2 diopters. The interval then remains constant with further increases to 3 and 4 diopters. The results are discussed in terms of the relative increase of transient to sustained visual channels and of the increase in apparent movement.
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Drakopoulos, Aris, and Richard W. Lyles. "Driver Age as a Factor in Comprehension of Left-Turn Signals." Transportation Research Record: Journal of the Transportation Research Board 1573, no. 1 (January 1997): 76–85. http://dx.doi.org/10.3141/1573-13.
Повний текст джерелаАнотація:
An experiment to measure driver comprehension of left-turn signal and sign configurations was conducted as part of a study to investigate the performance of left-turn signals used in various signal strategies. The responses of 191 individuals to 81 stimuli simulating left-turn signal phases were analyzed for the effect of signal message on driver comprehension. Stimuli included 17 left-turn signal displays used for permitted, protected, and protected/permitted left-turn strategies as well as left turns during nighttime or emergency flashing signal operations. Comprehension in the original study was based on a correct versus incorrect dichotomy: if the subject’s response agreed with a predetermined subset of possible answers, the answer was correct; all other answers were considered incorrect. These data are reanalyzed with three principal variations: ( a) individuals’ answers are based on a three-level correctness concept whereby answers considered incorrect in the previous study were further categorized into minor errors and serious errors depending on whether subjects incorrectly chose to “give away” their right-of-way or to violate other drivers’ right-of-way, respectively; ( b) signal message is introduced in the analysis as an explanatory variable of driver comprehension; and ( c) emphasis is placed on older drivers. Youngest, oldest, and female subjects were found to drive fewer kilometers per year than middle-aged males. Comprehension was found to deteriorate with driver age in terms of both higher serious error rates and lower correct answer rates. Flashing signals were the least well understood, whereas change and red interval stimuli were understood best by all age groups.
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Zanocco, P., D. Delmastro, and M. Giménez. "Numerical Aspects on the Prediction of Stability Boundaries of Two-Phase Natural Circulation Circuits, Considering Flashing Evaluation." Journal of Applied Mechanics 73, no. 6 (December 29, 2005): 911–22. http://dx.doi.org/10.1115/1.2178835.
Повний текст джерелаАнотація:
In this work, the stability of a two-phase, natural circulation circuit is analyzed, using a specially developed model. This thermohydraulic model results in a set of coupled, nonlinear, first-order partial differential equations, which are solved by means of the up-wind finite difference method, using combinations of explicit and implicit methods for the numerical integration of the different balance equations. An adaptive nodalization scheme is implemented, minimizing the error of the propagation of small perturbations through the discretized volumes and especially the ones having two-phase flow regime. A linearization method is implemented by means of numerical perturbations. Frequency domain calculations are carried out, allowing a rapid visualization of the stability of the linearized system. Two cases are analyzed: a test case, where the code is compared in a wide range of qualities with an analytical model, and an application case, where the model is used to analyze the stability of an integral reactor cooled by natural circulation. The CAREM prototype is taken as a reference. In both cases, the numerical diffusion and integration errors are analyzed in the stability limit prediction by means of a convergence analysis using different nodalization and numerical integration criteria.
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De, Bishnu Prasad, Rajib Kar, Durbadal Mandal, and Sakti Prasad Ghoshal. "Design of Optimal CMOS Inverter for Symmetric Switching Characteristics Using Firefly Algorithm with Wavelet Mutation." International Journal of Swarm Intelligence Research 5, no. 2 (April 2014): 29–64. http://dx.doi.org/10.4018/ijsir.2014040103.
Повний текст джерелаАнотація:
In this article, a population based meta-heuristic search method called Firefly Algorithm with Wavelet Mutation (FAWM) is applied for the optimal switching characterization of CMOS inverter. In Firefly Algorithm (FA), behaviour of flashing firefly towards its competent mate is structured. In this algorithm attractiveness depends on brightness of light and brighter fireflies are considered as more attractive among the population. For the present minimization based optimization problem, brightness varies inversely proportional to the error fitness value, so the position of the brightest firefly gives the optimum result corresponding to the least error fitness in multidimensional search space. FAWM incorporates a new definition of swarm updating with the help of wavelet mutation based on wavelet theory. Wavelet mutation enhances the FA to explore the solution space more effectively compared with the other optimization methods. The performance of FAWM is compared with real coded genetic algorithm (RGA), and conventional PSO reported in the literature. FAWM based design results are also compared with the PSPICE results. The comparative simulation results establish the FAWM as a more competent optimization algorithm to other aforementioned evolutionary algorithms for the examples considered and can be efficiently used for CMOS inverter design.
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Zainal, S. A., W. R. Daud, M. I. Rosli, S. Harun, Zulfan Adi Putra, and M. R. Bilad. "Development of An Integrated Surface and Sub-Surface Simulation Model in A Single Simulation Platform." Indonesian Journal of Science and Technology 5, no. 1 (January 29, 2020): 109–24. http://dx.doi.org/10.17509/ijost.v5i1.17439.
Повний текст джерелаАнотація:
An integrated model between surface and sub-surface is typically done by interconnecting many process modelling platforms. PROSPER and GAP are the common steady state modelling platforms for sub-surface while VMGSim and HYSYS are typical steady state surface modelling platforms. A major issue of using multiple simulation platforms is the compatibility of thermodynamic physical properties calculations among the platforms. This situation makes the simulations difficult to converge to a consistent thermo physical properties values. This is due to different interaction parameters applied in each platform that impact flashing and the physical property values even though the same property package such as Peng Robinson is used. To overcome this convergence problem, a single simulation platform within iCON (PETRONAS’s standard process simulation software, co-developed with VMG-Schlumberger) has been developed. This allows the use of one thermodynamic package across the integrated model. PROSPER sub-surface pressure-flow relationship results were automatically correlated and connected to surface models within the iCON environment. This integrated model was validated with data from operations and yielded about 1.23% average error tolerance. Based on this validated model, an optimization envelope can be developed with all possible well lineup configurations. This envelope covers set points for the operations where CAPEX free optimization can readily be applied.
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Noyce, David A., and Daniel B. Fambro. "Enhanced Traffic Control Devices at Passive Highway-Railroad Grade Crossings." Transportation Research Record: Journal of the Transportation Research Board 1648, no. 1 (January 1998): 19–27. http://dx.doi.org/10.3141/1648-03.
Повний текст джерелаАнотація:
More than 2,000 crashes and 239 fatalities were reported at public passive highway-railroad grade crossings in 1994. Driver error, often due to a breakdown in communication between traffic control devices and the driver, is commonly cited as a factor in passive grade crossing crashes. The objective of this study was to evaluate an improved method for communicating with drivers in an effort to improve safety at passive grade crossings. Specifically, this study evaluated the effectiveness of a vehicle-activated strobe light and supplemental sign as enhancements to the railroad advance (W10-1) warning sign at a passive highway-railroad grade crossing near Temple, Texas. Three study methods were used to evaluate this enhanced sign system including a before and after speed study, a driver survey, and a driver observation study. The results indicated that average speeds on the approaches to the grade crossing were lower after the installation of the enhanced sign system. Drivers responded favorably to the enhanced sign system, and no adverse driver reactions were observed at the onset of the flashing strobe light. The strobe light was effective in directing drivers’ attention to the railroad advance warning and supplemental signs. The enhanced sign system appears to increase driver awareness of the passive grade crossing, cause some drivers to approach the grade crossing with additional caution, and reduce the average speed near the nonrecovery zone on both approaches.
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Kumar, Abhijeet, and Arpit Kumar. "Contactless temperature and distance measuring device: A low-cost, novel infrared ―based "Badge"-shaped structural model for measuring physical distance and body temperature." AIMS Electronics and Electrical Engineering 6, no. 1 (2022): 43–60. http://dx.doi.org/10.3934/electreng.2022004.
Повний текст джерелаАнотація:
<abstract> <p>This work eases the feasibility of infrared thermometer application and reliability to introduce a novel design with upgraded applications & functions. The custom-designed compact device "Badge" structured comprises the operative methods through the electronic packages of an optimal level. The physical and social distance measured by the ToF (Time of Flight) infrared laser sensor within 1 m from the subject and the measuring equipment (MLX90632 SMD QFN and VL530LX ToF). When the distance is not maintained, or the physical distance condition is not met, the flashing LED, or vibration should trigger an indication (warning for physical distancing and alteration for pyrexia warning, respectively). Statistical analysis and simulation-based studies criticized the accuracy of ±0.5°F and relational model of the independent and dependent variable for this device with significant R<sup>2</sup> = 0.99 and P < = 1; values with the lowest accuracy error of ±0.2°F and least residual sum of squares 0.01462 values. The portable, lightweight, and dynamic body temperature monitoring altered the application from static to continuous, complete structural design. This alternative provides the best technique to combine worn (personnel) medical devices with primary healthcare instruments to help body temperature measurements that are not contactable, fast, and accurate. It builds a way of processing through the protocol Covid-19.</p> </abstract>
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Mikulić, Areh, and Michael C. Dorris. "Temporal and Spatial Allocation of Motor Preparation During a Mixed-Strategy Game." Journal of Neurophysiology 100, no. 4 (October 2008): 2101–8. http://dx.doi.org/10.1152/jn.90703.2008.
Повний текст джерелаАнотація:
Adopting a mixed response strategy in competitive situations can prevent opponents from exploiting predictable play. What drives stochastic action selection is unclear given that choice patterns suggest that, on average, players are indifferent to available options during mixed-strategy equilibria. To gain insight into this stochastic selection process, we examined how motor preparation was allocated during a mixed-strategy game. If selection processes on each trial reflect a global indifference between options, then there should be no bias in motor preparation (unbiased preparation hypothesis). If, however, differences exist in the desirability of options on each trial then motor preparation should be biased toward the preferred option (biased preparation hypothesis). We tested between these alternatives by examining how saccade preparation was allocated as human subjects competed against an adaptive computer opponent in an oculomotor version of the game “matching pennies.” Subjects were free to choose between two visual targets using a saccadic eye movement. Saccade preparation was probed by occasionally flashing a visual distractor at a range of times preceding target presentation. The probability that a distractor would evoke a saccade error, and when it failed to do so, the probability of choosing each of the subsequent targets quantified the temporal and spatial evolution of saccade preparation, respectively. Our results show that saccade preparation became increasingly biased as the time of target presentation approached. Specifically, the spatial locus to which saccade preparation was directed varied from trial to trial, and its time course depended on task timing.
Дисертації з теми "Flashing error"
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Пилипенко, Володимир Олександрович. "Програмне забезпечення з аналізу результатів інтеграційних тестів". Bachelor's thesis, КПІ ім. Ігоря Сікорського, 2020. https://ela.kpi.ua/handle/123456789/40063.
Повний текст джерелаАнотація:
Пояснювальна записка дипломного проєкту складається з чотирьох розділів, містить 8 рисунків, 30 таблиць та 12 джерел – загалом 58 сторінок.
Об’єкт дослідження: програмне забезпечення аналізу помилок за результатами інтеграційних тестів.
Мета дипломного проєкту: підвищити швидкість розробки, поліпшити сприйняття звітності інтеграційного тестування для всіх користувачів, не залежно від ступеню знань в системі, надання менеджерам більш детальну інформацію для визначення або перевизначення пріоритету та терміновості нових і вже існуючих помилок, а також отримувати більш точних результатів тестів після внесення своїх змін до коду, навіть у випадках коли гілка являється нестабільною.
У першому розділі було проведено аналіз відомих технічних рішень та розроблені вимоги до програмного продукту.
У другому було розроблено архітектуру програмне забезпечення.
Побудовано структурну схему класів та BPMN діаграму.
У третьому розділі було проведено тестування програмне забезпечення аналізу помилок за результатами інтеграційних тестів за розробленим планом тестування.
У четвертому розділі було зроблено детальний опис розгортання та користування розробленим програмним забезпеченням.The explanatory note of the diploma project consists of four sections, 30 tables, 8 illustrations and 12 sources – totally 58 pages. The object of study: error analysis software based on the results of integration tests. The aim of the diploma project: increase the speed of development, improve the perception of integration testing reporting for all users, regardless of the level of knowledge in the system, provide managers with more detailed information to determine or redefine the priority and urgency of new and existing errors, and get more accurate test results after making changes in the code, even when the branch is unstable. In the first section analyzes the known technical solutions and develops requirements for the software product. In the second section the software architecture was described and developed. The block diagram of classes and the BPMN diagram are constructed. In the third section the software of error analysis based on the results of integration tests was tested according to the developed testing plan. In the fourth section provides a detailed description of the deployment and use of the developed software.
Тези доповідей конференцій з теми "Flashing error"
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Xu, Yifan, Minjun Peng, Genglei Xia, and Yanan Zhao. "Validation of RELAP5/MOD3.4 for Flashing-Induced Instabilities in a Natural Circulation Loop." In 2020 International Conference on Nuclear Engineering collocated with the ASME 2020 Power Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/icone2020-16296.
Повний текст джерелаАнотація:
Abstract This paper aims to validate the effectiveness of the widely used Relap5 code in simulating two-phase natural circulation, and its capability to predict flashing-induced instabilities. The RELAP5 code is validated against experimental data from the NMR test facility, which was designed to investigate the flow instability for a BWR-type novel modular reactor (NMR). The simulations by RELAP5/MOD3.4 code had been performed under various conditions by changing system pressure, core inlet subcooling, core inlet flow resistance, and core heat power etc. The flow stability for a certain operating condition could be determined from the time trace profile of the loop natural circulation flow rate. The results showed that the simulated mass flow rate increased with increasing core inlet temperature, reproducing the experimental trend. And the maximum error between the experimental data and the calculated results is within 10%. The predicted natural circulation dimensionless numbers, the phase change number and inlet subcooling number, also had a good agreement with the experimental data. In general, the RELAP5 code is able to simulate flashing-induced instability and density wave oscillations, which occurred in the natural circulation test facility at low pressures. However, flashing tends to be suppressed at a higher pressure (400kPa). And the enlargement of core inlet resistance coefficient can also have a positive impact on natural circulation system stability.
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Liao, Yixiang, Dirk Lucas, Eckhard Krepper, and Roland Rzehak. "CFD Simulation of Flashing Boiling Flow in the Containment Cooling Condensers (CCC) System of KERENA™ Reactor." In 2013 21st International Conference on Nuclear Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/icone21-16290.
Повний текст джерелаАнотація:
The flashing boiling phenomenon occurring inside the Containment Cooling Condensers (CCC) passive system of KERENA™ reactor was simulated by using the CFD (Computational Fluid Dynamics) code ANSYS CFX. The steam generation was assumed to be caused by thermal phase change, which is controlled by interphase heat transfer. In general, the model setup is able to capture the generation and disappearance of steam and the fluctuation of pressure and temperature observed during the flashing. However, since the nucleation and bubble growth process was neglected in the simulation, the initialization of evaporation was found to be a key issue, which depends on the prescribed bubble size sensitively. In order to get a satisfying agreement with the experimental data, a relatively large size has to be assumed for the selected test case (db>10 mm). The CFD results are qualitatively comparable to those obtained by using the system code ATHLET, except that the mass transfer rate is higher and the fluctuation frequency and altitude is lower. In addition, the assumption of constant bubble size might introduce significant error. The change of bubble size as well as the effect of nucleation and bubble growth should be investigated in the future work. For this purpose, however, further experimental data such as evaporation rate, phase and bubble size distribution, phase velocity are required.