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Автор: Grafiati
Опубліковано: 11 вересня 2023

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Статті в журналах з теми "BACK-TESTING ANALYSIS"

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Kapranov, B. I., V. J. Maklashevsky, and V. N. Filinov. "ANALYSIS OF MULTIPLE SCATTERING CONTRIBUTION IN THE BACK-SCATTER X-RAY TESTING." Nondestructive Testing and Evaluation 12, no. 5 (January 1996): 305–13. http://dx.doi.org/10.1080/10589759608952854.

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2

Sladen, J. A., R. D. D'Hollander, J. Krahn, and D. E. Mitchell. "Back analysis of the Nerlerk berm liquefaction slides." Canadian Geotechnical Journal 22, no. 4 (November 1, 1985): 579–88. http://dx.doi.org/10.1139/t85-077.

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Анотація:
Five liquefaction slides occurred in 1983 during the construction of a hydraulically placed subsea sand berm designed to form part of a bottom-founded, offshore, hydrocarbon exploration platform at Nerlerk in the Canadian Beaufort Sea. These slides were triggered by simple static loading arising from the sand placement itself. Failures started at locally oversteepened side slopes and retrogressed to form bowl-shaped crests. The slide material came to rest beyond the berm at very flat slopes. Stability back analyses reveal that effective stress strength parameters consistent with limiting equilibrium are within the range of the collapse surface parameters determined from triaxial laboratory tests. This finding lends credibility to the collapse surface concepts introduced in another study. Back calculations show that the berm state prior to failure was much looser than the steady state, with the potential for a large strength loss. According to back calculations, the berm density was lower than that inferred from cone penetration tests. Key words: liquefaction, sand, hydraulic fill, slope stability, cone penetration testing.
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3

Glodež, Srečko, and Marko Šori. "Bending Fatigue Analysis of PM Gears." Key Engineering Materials 754 (September 2017): 299–302. http://dx.doi.org/10.4028/www.scientific.net/kem.754.299.

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The paper discusses the computational and experimental approach for determination of the PM gears service life concerning bending fatigue in a gear tooth root. A proposed computational model is based on the stress-life approach where the stress field in a gear tooth root is determined numerically using FEM. The experimental procedure was done on a custom made back-to-back gear testing rig. The comparison between computational and experimental results has shown that the proposed computational approach is appropriate calculation method for service life estimation of sintered gears regarding tooth root strength. Namely, it was shown that in the case of proper heat treatment of tested gears, the tooth breakage occurred inside the interval with 95 % probability of failure, which has been determined using proposed computational model.
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4

Hall, Hubert S., and Curtis Larsen. "Modal testing on a limited budget: Analysis of instrumented hammer alternatives for impact testing." Journal of the Acoustical Society of America 153, no. 3_supplement (March 1, 2023): A288. http://dx.doi.org/10.1121/10.0018872.

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In recent years, as the use of numerical modeling has increased, organizations have frequently scaled back their experimental capabilities. Often equipment and expertise are no longer available when modal correlation measurements are required. This presentation is part of a planned series examining a minimalist approach to modal testing. In this presentation, alternatives to a traditional instrumented hammer for impact testing are explored. Comparison testing between a dedicated instrumented hammer procured from a leading structural measurement company and commercial hammers acquired from a hardware store was performed. Two cases of commercial hammers were studied, one featuring a force gauge inserted into the impact hammer face and one with an accelerometer attached to the hammer body. A variety of hammer tips were explored for focused frequency content. Follow-on topics include rudimentary data acquisition options and methods of modal data analysis outside of expensive dedicated modal analysis software platforms.
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5

Chen, Zhi Ge. "The Measurement and Analysis of Clothing Pressure." Advanced Materials Research 332-334 (September 2011): 1176–79. http://dx.doi.org/10.4028/www.scientific.net/amr.332-334.1176.

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The clothing pressure was mainly occurred on the shoulder, arm, back, underarm, elbow. It was tested by using the AMI clothing physiological comfort testing system. Arm moved from 0º to 140º positions in experiment when the clothing pressure was tested. The changes of clothing pressure of loosely fitted clothing are analyzed and discussed in this paper. The largest clothing pressure was occurred on the arm. The experiment results could explain the feelings of pressure properly.
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6

Mu, Xiao Gang, and Jiao Yang Xia. "The Fitness Characteristics of Elite Female Skaters and Regression Analysis." Applied Mechanics and Materials 477-478 (December 2013): 341–44. http://dx.doi.org/10.4028/www.scientific.net/amm.477-478.341.

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With the method of ISOMED isokinetic testing system, INBODY 3.0 body composition analyzer and ADIPOMETER subcutaneous fat measuring instrument, this study tries to measure the fitness characteristics of female athletes and then apply mathematical statistics to complete a regression analysis with their results. The main conclusions are as follows: 1. 480°/s hip extensor480°/s knee extensor and 240°/s radios of knee flexor-extensor are highly negative correlated with 500m results, and the regression equation is y = 20.496 - 0.72x1 - 0.64x2 - 0.82x3. 2. Results of the body composition and subcutaneous fat are not highly correlated with 500m result. The hip flexor and extensor at three angular speeds are highly negative correlated with subcutaneous fat of abdomen, upper knee and back, but are highly positive correlated with weight, FFM, BMI and BMR. 3. According to the testing results of body composition, there is no significant difference between two groups, both up to the standard of Asia and world. The maximum value of subcutaneous fat is in abdomen and for another is in upper knees. The minimum value of subcutaneous fat is in outer thigh for long distance athletes and in back for short distance athletes, no significant difference.
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7

Yan, Shuai, Hong Wang, Yang Chen, and An Ye Liu. "Full Power Back-to-Back Test Platform for Large Scale Electrical-Excited Direct Driven Wind Turbine." Advanced Materials Research 860-863 (December 2013): 1733–37. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.1733.

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To solve the problem about prototype development of electrical-excited power conversion system of large-scale direct-driven wind turbine and the test challenges during mass-production, advance technology solutions by full power back-to-back testing, focusing on the electrical topology including the key technologies and the working modes. Finally, introduce the relevant standards and the test methods in pilot project, listing part of test results and their analysis.
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8

Mozumder, Sharif, Michael Dempsey, and M. Humayun Kabir. "Back-testing extreme value and Lévy value-at-risk models." Journal of Risk Finance 18, no. 1 (January 16, 2017): 88–118. http://dx.doi.org/10.1108/jrf-03-2016-0029.

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Purpose The purpose of the paper is to back-test value-at-risk (VaR) models for conditional distributions belonging to a Generalized Hyperbolic (GH) family of Lévy processes – Variance Gamma, Normal Inverse Gaussian, Hyperbolic distribution and GH – and compare their risk-management features with a traditional unconditional extreme value (EV) approach using data from future contracts return data of S&P500, FTSE100, DAX, HangSeng and Nikkei 225 indices. Design/methodology/approach The authors apply tail-based and Lévy-based calibration to estimate the parameters of the models as part of the initial data analysis. While the authors utilize the peaks-over-threshold approach for generalized Pareto distribution, the conditional maximum likelihood method is followed in case of Lévy models. As the Lévy models do not have closed form expressions for VaR, the authors follow a bootstrap method to determine the VaR and the confidence intervals. Finally, for back-testing, they use both static calibration (on the entire data) and dynamic calibration (on a four-year rolling window) to test the unconditional, independence and conditional coverage hypotheses implemented with 95 and 99 per cent VaRs. Findings Both EV and Lévy models provide the authors with a conservative proportion of violation for VaR forecasts. A model targeting tail or fitting the entire distribution has little effect on either VaR calculation or a VaR model’s back-testing performance. Originality/value To the best of the authors’ knowledge, this is the first study to explore the back-testing performance of Lévy-based VaR models. The authors conduct various calibration and bootstrap techniques to test the unconditional, independence and conditional coverage hypotheses for the VaRs.
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9

Khan, Md Hasinur Rahaman, and Tamanna Howlader. "Breaking the back of COVID-19: Is Bangladesh doing enough testing?" Journal of Biomedical Analytics 3, no. 2 (September 7, 2020): 25–35. http://dx.doi.org/10.30577/jba.v3i2.46.

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Following detection of the first 100 confirmed cases of COVID-19 in early April, Bangladesh stepped up its efforts to strengthen testing capacity in order to curb the spread of the disease across the country. This paper sheds light on the position of Bangladesh in relation to its South Asian neighbors India and Pakistan with respect to testing capacity and ability to detect cases with increased testing. It also analyzes recent data on case counts and testing numbers in Bangladesh, to provide an idea regarding the number of extra tests needed to detect a substantial number of cases within a short period of time. Findings indicate that compared to India and Pakistan, Bangladesh was able to detect more cases by increasing testing levels and expand its testing capacity by performing more per capita tests. In spite of these achievements, the rate of reported cases per 100 tests was consistently higher for Bangladesh compared to India, which suggests that in addition to increased testing, other factors, such as, effective enforcement of social distancing and efficient contact tracing are just as important in curbing the spread of the disease. The analysis reveals that current testing levels in Bangladesh are not adequate. Based on the findings, we recommend a 30-50\% growth of the current test rate in the next few days so that by detecting and isolating more cases, Bangladesh could, in effect, contain the spread of new infections. The challenge, however, is to mobilize resources necessary to expand geographical coverage and improve testing quality while enforcing social distancing and performing efficient contact tracing.
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10

Kim, Yun Jae, and Chang Gyun Oh. "Slip Line Field Analysis of Unequally Grooved Specimens in Bending and Its Implication to Constraint Toughness Testing." Key Engineering Materials 306-308 (March 2006): 25–30. http://dx.doi.org/10.4028/www.scientific.net/kem.306-308.25.

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This paper proposes slip line fields for bending of unequally grooved specimens that has a sharp crack in one side and a sharp V-notch in the other side. Depending on the back angle, two slip line fields are proposed, from which the limit moment and crack tip stress fields are obtained as a function of the back angle. Excellent agreements between slip line field solutions with those from detailed finite element limit analysis based on non-hardening plasticity provide confidence in the proposed slip line fields. Based on these results, possibility of designing a new toughness testing specimen with varying crack tip constraint is discussed.
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Дисертації з теми "BACK-TESTING ANALYSIS"

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Menke, James Michael. "Developing and Testing a Comparative Effectiveness Methodology for Alternative Treatments of Low Back Pain." Diss., The University of Arizona, 2010. http://hdl.handle.net/10150/145382.

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This paper describes and tests a largely ignored but important preliminary step for comparative effectiveness research: retrospective evidence syntheses to first establish a knowledge base of condition-based medical conditions. By aggregating and organizing what is already known about a treatment or system, gaps in knowledge can be identified and future research designed to meet those gaps.An information synthesis process may also discover that few knowledge gaps in the knowledge base yet exist, the gaps are negligible, and / or treatment effectiveness and study quality is stable across many years, but is simply not clinically important. A consistent finding of low effectiveness is evidence against more research, including exclusion of a treatment from future comparative effectiveness studies. Though proponents of weak treatments or systems may choose to proceed with further research, use of public funds or resources that eventually increase costs to the public are unwarranted.By first establishing a treatment or system knowledge base, at least three comparative effectiveness research decisions are conceivable: (1) treatment or system should be included in future comparative effectiveness trials to establish relative effectiveness for a given condition, (2) has promise but requires more research in a prospective CER trial, or (3) the treatment is less effective than others for a given condition, making future research unnecessary. Thus, a "retroactive comparative effectiveness research method," rCER, is proposed here to identify which treatments are worth including in future prospective trials and which are known to have small to modest effect sizes and are not worth the time and expense of a closer look.The rCER method herein showed that for non-surgical low back pain any treatments did not improve greatly upon the normal and natural pain trajectory for acute low back pain. Therefore, any advantage in pain reduction by any treatment of acute low back pain over back pain's normal course of resolution without care, is quite small, and as such, the incremental cost for the marginal improvement over no treatment becomes quite large. While the quality of non-surgical low back pain studies over the past 34 years has steadily increased, the effect size has not, leading to the conclusion that future research on non-surgical low back pain treatment is unwarranted.
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2

Gustafsson, Dan. "The Validity of Technical Analysis for the Swedish Stock Exchange : Evidence from random walk tests and back testing analysis." Thesis, Internationella Handelshögskolan, Högskolan i Jönköping, IHH, Economics, Finance and Statistics, 2012. http://urn.kb.se/resolve?urn=urn:nbn:se:hj:diva-18427.

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In this paper I examine the validity of technical analysis for the Swedish stock index OMXS30 between 2001-12-28 and 2011-12-30.  Results indicate that OMXS30 followed a non-random walk and that technical trading rules had predictive power over future price movements. Results also suggest that technical trading rules could be used to outperform a buy-and-hold strategy.
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Murphy, Nicholas John. "An online learning algorithm for technical trading." Master's thesis, Faculty of Science, 2019. http://hdl.handle.net/11427/31048.

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We use an adversarial expert based online learning algorithm to learn the optimal parameters required to maximise wealth trading zero-cost portfolio strategies. The learning algorithm is used to determine the relative population dynamics of technical trading strategies that can survive historical back-testing as well as form an overall aggregated portfolio trading strategy from the set of underlying trading strategies implemented on daily and intraday Johannesburg Stock Exchange data. The resulting population time-series are investigated using unsupervised learning for dimensionality reduction and visualisation. A key contribution is that the overall aggregated trading strategies are tested for statistical arbitrage using a novel hypothesis test proposed by Jarrow et al. [31] on both daily sampled and intraday time-scales. The (low frequency) daily sampled strategies fail the arbitrage tests after costs, while the (high frequency) intraday sampled strategies are not falsified as statistical arbitrages after costs. The estimates of trading strategy success, cost of trading and slippage are considered along with an offline benchmark portfolio algorithm for performance comparison. In addition, the algorithms generalisation error is analysed by recovering a probability of back-test overfitting estimate using a nonparametric procedure introduced by Bailey et al. [19]. The work aims to explore and better understand the interplay between different technical trading strategies from a data-informed perspective.
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4

Kratochvíl, Bohumír. "Technická analýza." Master's thesis, Vysoké učení technické v Brně. Fakulta podnikatelská, 2014. http://www.nusl.cz/ntk/nusl-224763.

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Анотація:
Master´s thesis goal that the author hopes to achieve is a design of an application aiding stock technical analysis based on identified needs. Based on analysis regarding modules for technical analysis of current trading platforms, I found out there is a certain space for improvement. Implemented trading rules and technical indicators of the application itself are further examined in terms of prognostic success rate on historical data. Selected chapters of technical analysis are fundamental base for this master´s thesis.
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5

"Loading rate effects on pile load-displacement behaviour derived from back-analysis of two load testing procedures." Université catholique de Louvain, 2004. http://edoc.bib.ucl.ac.be:81/ETD-db/collection/available/BelnUcetd-10262004-184727/.

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DANISH, MOHAMMAD. "OPTIMIZATION OF STOCK TRADING STRATEGY WITH REINFORCEMENT LEARNING." Thesis, 2023. http://dspace.dtu.ac.in:8080/jspui/handle/repository/19831.

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Анотація:
This project aims to optimize stock trading strategies by employing reinforcement learning (RL) techniques. The primary goal is to create a trading strategy capable of learning from historical data and executing profitable trades in real-time. The proposed method involves utilizing a deep neural network as a function approximator to learn a trading policy, which is subsequently fine-tuned using RL techniques. The neural network takes a set of technical indicators as input and generates buy, hold, or sell signals for each stock. To assess the performance of the RL-based trading strategy, a dataset comprising historical stock prices from the NIFTY and SENSEX indices is utilized. The performance of this approach is compared to several conventional trading strategies such as buy-and-hold and moving average crossover. The results indicate that the RL-based trading strategy surpasses these traditional strategies in terms of profitability and risk-adjusted returns. Additionally, sensitivity analysis is conducted to evaluate how different hyper-parameters impact the trading strategy's performance. Specifically, variations in the discount factor, learning rate, and exploration rate of the RL algorithm are examined, and their effects on the trading strategy's performance are analysed. The results demonstrate that the RL-based approach is robust against changes in hyper-parameters and consistently outperforms traditional strategies. Furthermore, a back-testing analysis is performed to assess the RL-based trading strategy's performance on out-of-sample data. A rolling window approach is implemented to simulate real-time trading, and the trading strategy's performance is evaluated over time. The results consistently show that the RL-based trading strategy outperforms traditional strategies and achieves higher risk-adjusted returns. Overall, the findings suggest that RL-based approaches have significant potential for enhancing the performance of stock trading strategies. The proposed method can be applied to various financial assets and can facilitate the development of automated trading systems capable of executing profitable trades in real-time.
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7

McCanna, David. "Development of Sensitive In Vitro Assays to Assess the Ocular Toxicity Potential of Chemicals and Ophthalmic Products." Thesis, 2009. http://hdl.handle.net/10012/4338.

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The utilization of in vitro tests with a tiered testing strategy for detection of mild ocular irritants can reduce the use of animals for testing, provide mechanistic data on toxic effects, and reduce the uncertainty associated with dose selection for clinical trials. The first section of this thesis describes how in vitro methods can be used to improve the prediction of the toxicity of chemicals and ophthalmic products. The proper utilization of in vitro methods can accurately predict toxic threshold levels and reduce animal use in product development. Sections two, three and four describe the development of new sensitive in vitro methods for predicting ocular toxicity. Maintaining the barrier function of the cornea is critical for the prevention of the penetration of infections microorganisms and irritating chemicals into the eye. Chapter 2 describes the development of a method for assessing the effects of chemicals on tight junctions using a human corneal epithelial and canine kidney epithelial cell line. In Chapter 3 a method that uses a primary organ culture for assessing single instillation and multiple instillation toxic effects is described. The ScanTox system was shown to be an ideal system to monitor the toxic effects over time as multiple readings can be taken of treated bovine lenses using the nondestructive method of assessing for the lens optical quality. Confirmations of toxic effects were made with the utilization of the viability dye alamarBlue. Chapter 4 describes the development of sensitive in vitro assays for detecting ocular toxicity by measuring the effects of chemicals on the mitochondrial integrity of bovine cornea, bovine lens epithelium and corneal epithelial cells, using fluorescent dyes. The goal of this research was to develop an in vitro test battery that can be used to accurately predict the ocular toxicity of new chemicals and ophthalmic formulations. By comparing the toxicity seen in vivo animals and humans with the toxicity response in these new in vitro methods, it was demonstrated that these in vitro methods can be utilized in a tiered testing strategy in the development of new chemicals and ophthalmic formulations.
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Книги з теми "BACK-TESTING ANALYSIS"

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United States. National Aeronautics and Space Administration. Scientific and Technical Information Branch., ed. Natural laminar flow flight experiments on a swept wing business jet: Boundary layer stability analyses. [Washington, D.C.]: National Aeronautics and Space Administration, Scientific and Technical Information Branch, 1986.

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Частини книг з теми "BACK-TESTING ANALYSIS"

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Aldughaim, Mohannad, Kaled M. Alshmrany, Mikhail R. Gadelha, Rosiane de Freitas, and Lucas C. Cordeiro. "FuSeBMC_IA: Interval Analysis and Methods for Test Case Generation." In Fundamental Approaches to Software Engineering, 324–29. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-30826-0_18.

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AbstractThe cooperative verification of Bounded Model Checking and Fuzzing has proved to be one of the most effective techniques when testing C programs. FuSeBMC is a test-generation tool that employs BMC and Fuzzing to produce test cases. In Test-Comp 2023, we present an interval approach to FuSeBMC_IA, improving the test generator to use interval methods and abstract interpretation (via Frama-C) to strengthen our instrumentation and fuzzing. Here, an abstract interpretation engine instruments the program as follows. It analyzes different program branches, combines the conditions of each branch, and produces a Constraint Satisfaction Problem (CSP), which is solved using Constraint Programming (CP) by interval manipulation techniques called Contractor Programming. This process has a set of invariants for each branch, which are introduced back into the program as constraints. Experimental results show improvements in reducing CPU time (37%) and memory (13%), while retaining a high score.
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2

Jan, Pruška. "Neural Networks in Back Analysis of Tunnels." In Durability of Critical Infrastructure, Monitoring and Testing, 27–34. Singapore: Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-3247-9_4.

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3

Lynn, Jordan. "Combining Back-End Telemetry Data with Established User Testing Protocols: A Love Story." In Game Analytics, 497–514. London: Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-4769-5_22.

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4

Miedema, Frank. "Science for, in and with Society: Pragmatism by Default." In Open Science: the Very Idea, 109–27. Dordrecht: Springer Netherlands, 2021. http://dx.doi.org/10.1007/978-94-024-2115-6_4.

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Анотація:
AbstractTo rethink the relation between science and society and its current problems authoritative scholars in the US and Europe, but also around the globe, have since 1980 implicitly and increasingly explicitly gone back to the ideas of American pragmatism. Pragmatism as conceived by its founders Peirce, James and Dewey is known for its distinct philosophy/sociology of science and political theory. They argued that philosophy should not focus on theoretical esoteric problems with hair-splitting abstract debates of no interest to scientists because unrelated to their practice and problems in the real world. In a realistic philosophy of science, they did not accept foundationalism, dismissed the myth of given eternal principles, the unique ‘scientific method’, absolute truths or let alone a unifying theory. They saw science as a plural, thoroughly social activity that has to be directed to real world problems and subsequent interventions and action. ‘Truth’ in their sense was related to the potential and possible impact of the proposition when turned in to action. Knowledge claims were regarded per definition a product of the community of inquirers, fallible and through continuous testing in action were to be improved. Until 1950, this was the most influential intellectual movement in the USA, but with very little impact in Europe. Because of the dominance of the analytic positivistic approach to the philosophy of science, after 1950 it lost it standing. After the demise of analytical philosophy, in the 1980s of the previous century, there was a resurgence of pragmatism led by several so-called new or neo-pragmatists. Influential philosophers like Hillary Putnam and Philip Kitcher coming from the tradition of analytic philosophy have written about their gradual conversion to pragmatism, for which in the early days they were frowned upon by their esteemed colleagues. This new pragmatist movement gained traction first in the US, in particular through works of Bernstein, Toulmin, Rorty, Putnam and Hacking, but also gained influence in Europe, early on though the works of Apel, Habermas and later Latour.
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"The Sample Analysis: The Proof is in the Back-Testing." In Candlestick and Pivot Point Trading Triggers, 279–306. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2015. http://dx.doi.org/10.1002/9781119202233.ch11.

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6

van der Zon, W., A. Bezuijen, and A. Talmon. "Laboratory testing of grout properties and their influence on back fill grouting." In Underground Space Use. Analysis of the Past and Lessons for the Future. Taylor & Francis, 2005. http://dx.doi.org/10.1201/noe0415374521.ch140.

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Isiker, Murat, Umut Ugurlu, and Oktay Tas. "Investigation of the Calendar Effect." In Recent Applications of Financial Risk Modelling and Portfolio Management, 47–67. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-5083-0.ch003.

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Анотація:
This chapter aims to examine calendar anomaly in selected sample countries by using second-order stochastic dominance (SSD) approach. Day-of-the-week and month-of-the-year effects are analysed for a group of 5 developed and 5 developing country indexes to estimate efficient (inefficient) weekdays and months for the period between 1988 and 2016. Then, back-testing procedure is applied for each sample country to compare performance of index returns for 2017-2019 with the strategy arisen by estimation results. Findings suggest that Monday and Friday returns are inefficient and efficient respectively in all developing countries where different results obtained for developed ones. In monthly analysis, December returns found efficient in 8 indexes including S&P 500. However, October is inefficient for all indexes. Positive January effect seems disappeared in most cases. Back-testing results indicate that in a bearish market condition SSD strategy outperforms index returns in general for daily and monthly comparison.
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Li, Xining, and Jiazao Lin. "Call U Back." In Modern Entrepreneurship and E-Business Innovations, 61–73. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2946-2.ch005.

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Mobile commerce (M-commerce) is an attractive research area due to its relative novelty, rapid growth, and great potential in business applications. Over the last decade, various M-commerce applications have been geared to target mobile users and achieved great success. However, most M-commerce applications are developed by different retailers for special purposes and thus lack fully automated business processes to integrate various existing services. This paper presents a novel infrastructure, Call U Back (CUB), for M-commerce applications. The proposed scheme integrates concepts of agent and context-aware workflow to implement automated trading tasks and compose services dynamically. The context awareness is based on ontology and logic models which derive from a set of descriptive contextual attributes for knowledge sharing and logical inference. Based upon the context-aware workflow analysis, the system will generate automated intelligent agents to conduct commerce transactions on behalf of mobile users. The middleware layer of the CUB server has been implemented. An experimental prototype of the system is under development and testing.
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Lala, Archana, Kunal Lala, and Vinod Kumar Singh. "Bandwidth Analysis of Dual-Feed Slotted Antenna Using Artificial Neural Networks." In Advances in Wireless Technologies and Telecommunication, 70–84. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-7611-3.ch006.

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In this chapter, artificial neural network is used for the estimation of bandwidth of a dual feed microstrip antenna. The MLPFFBP-ANN and RBF-ANN are used to implement the neural network model. The simulated values for training and testing the neural network are obtained by simulating the antenna on IE3D software. The results obtained by using ANNs and IE3D simulation are compared and are found quite acceptable, and also it is concluded that RBF network is more accurate and fast as compared to back propagation algorithm of MLPFFBP. The anticipated is applicable to operate in triple band from 2.208GHz-5.35GHz, 2.358GHz-2.736GHz, and 3.815GHz-5.143GHz. The antenna is also fabricated with FR-4 glass epoxy material. The experimental results, simulated results of IE3D, and simulated results of neural network are compared.
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Rashid, Tarik A., Mohammad K. Hassan, Mokhtar Mohammadi, and Kym Fraser. "Improvement of Variant Adaptable LSTM Trained With Metaheuristic Algorithms for Healthcare Analysis." In Advances in Medical Technologies and Clinical Practice, 111–31. IGI Global, 2019. http://dx.doi.org/10.4018/978-1-5225-7796-6.ch006.

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Recently, the population of the world has increased along with health problems. Diabetes mellitus disease as an example causes issues to the health of many patients globally. The task of this chapter is to develop a dynamic and intelligent decision support system for patients with different diseases, and it aims at examining machine-learning techniques supported by optimization techniques. Artificial neural networks have been used in healthcare for several decades. Most research works utilize multilayer layer perceptron (MLP) trained with back propagation (BP) learning algorithm to achieve diabetes mellitus classification. Nonetheless, MLP has some drawbacks, such as, convergence, which can be slow; local minima can affect the training process. It is hard to scale and cannot be used with time series data sets. To overcome these drawbacks, long short-term memory (LSTM) is suggested, which is a more advanced form of recurrent neural networks. In this chapter, adaptable LSTM trained with two optimizing algorithms instead of the back propagation learning algorithm is presented. The optimization algorithms are biogeography-based optimization (BBO) and genetic algorithm (GA). Dataset is collected locally and another benchmark dataset is used as well. Finally, the datasets fed into adaptable models; LSTM with BBO (LSTMBBO) and LSTM with GA (LSTMGA) for classification purposes. The experimental and testing results are compared and they are promising. This system helps physicians and doctors to provide proper health treatment for patients with diabetes mellitus. Details of source code and implementation of our system can be obtained in the following link “https://github.com/hamakamal/LSTM.”
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Тези доповідей конференцій з теми "BACK-TESTING ANALYSIS"

1

Pricop, M. V., M. G. Cojocaru, C. I. Stoica, M. L. Niculescu, A. M. Neculaescu, A. G. Persinaru, and M. Boscoianu. "Glide back booster wind tunnel model testing." In INTERNATIONAL CONFERENCE OF NUMERICAL ANALYSIS AND APPLIED MATHEMATICS (ICNAAM 2016). Author(s), 2017. http://dx.doi.org/10.1063/1.4992593.

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2

Wang, Jun, Yanhui Li, Xiang Huang, Lin Chen, Xiaofang Zhang, and Yuming Zhou. "Back Deduction Based Testing for Word Sense Disambiguation Ability of Machine Translation Systems." In ISSTA '23: 32nd ACM SIGSOFT International Symposium on Software Testing and Analysis. New York, NY, USA: ACM, 2023. http://dx.doi.org/10.1145/3597926.3598081.

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3

Changjing Fu and Liang Chen. "Researches on the back analysis of seepage field and temperature testing influenced by seepage field." In 2011 International Conference on Electric Technology and Civil Engineering (ICETCE). IEEE, 2011. http://dx.doi.org/10.1109/icetce.2011.5776505.

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4

Moffat, Ricardo, and Diego Rivera. "Back-analysis & in-situ shear testing studies to estimate shear strength parameters on an actual slope." In Geo-Congress 2013. Reston, VA: American Society of Civil Engineers, 2013. http://dx.doi.org/10.1061/9780784412787.017.

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5

Kennedy, C. E., K. Terwilliger, and G. J. Jorgensen. "Analysis of Accelerated Exposure Testing of Thin-Glass Mirror Matrix." In ASME 2005 International Solar Energy Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/isec2005-76040.

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Анотація:
Concentrating solar power (CSP) companies have deployed thin-glass mirrors produced by wet silver processes on ∼1-mm-thick, relatively lightweight glass. These mirrors have been bonded to metal substrates in commercial installations. Initial hemispherical reflectance is ∼93% to 96%, and the cost is ∼$16.1/m2 to $43.0/m2. These mirrors have the confidence of the CSP industry. However, corrosion was observed in mirror elements of operational solar systems deployed outdoors for 2 years. NREL’s advanced optical materials team was assigned to investigate the problem. First, it was noted that this corrosion is very similar to the corrosion bands and spots observed on small (45 mm × 67 mm) thin-glass mirrors laminated to metal substrates with several different types of adhesives and subjected to accelerated exposure testing (AET) at NREL. These samples exhibited corrosion at the unprotected edges and along cracks, and the choice of adhesive affected the performance of weathered thin-glass mirrors. Secondly, two significant changes in mirror manufacture have occurred in the wet-chemistry process because of environmental concerns. The first is the method of forming a copper-free reflective mirror, and the second is the use of lead-free paints. A test matrix of 84 combinations of sample constructions (mirror type / back protective paint / adhesive / substrate) was devised for AET as a designed experiment to identify the most promising mirrors, paints, and adhesives for use with concentrator designs. Two types of accelerated exposure were used: an Atlas Ci5000 WeatherOmeter (WOM) and a damp-heat chamber. Based on an analysis of variance (ANOVA), the various factors and interactions were modeled. These samples now have almost 24 months of accelerated exposure. Analysis of the thin-glass mirror matrix indicated that the Glaverbel mirror with a copperless formulation demonstrates slightly better performance compared to the Naugatuck standard copper-containing mirror and new copperless constructions although most results are within experimental uncertainty. Analysis of the thin-glass mirror matrix indicates commercial (non-mirror) back-protective paint applied after mirror manufacturing is not beneficial. Degradation of the samples exposed to date in the damp-heat chamber is similar, but at a rate 10 times faster than observed for samples in the WOM. We will discuss the results of the continued exposure testing of these mirror samples. Although glass mirrors with copper back-layers and heavily leaded paints have been considered robust for outdoor use, the new copperless back-layer and lead-free paint systems were designed for interior mirror applications and the outdoor durability must be determined.
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6

Herbst, Brian R., Chris C. Clarke, Steven E. Meyer, Arin A. Oliver, Davis A. Hock, Joshua D. Hayden, and Stephen M. Forrest. "Quasi-Static and Dynamic Testing as a Basis for Determining Seat Back Strength." In ASME 2008 International Mechanical Engineering Congress and Exposition. ASMEDC, 2008. http://dx.doi.org/10.1115/imece2008-66222.

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The performance of a vehicle’s seat back in rear impact accidents can significantly affect occupant kinematics and the associated injury potential. Efforts to establish seat back performance requirements have generated significant debate between stiff and yielding seats [1]. While this paper will not attempt to resolve that issue, the analysis contained herein will compare various test methods for determining the strength of seat backs. This paper presents two quasi-static test methodologies that can be used to evaluate seat back performance. The first method utilizes the test procedure outlined in Federal Motor Vehicle Safety Standard (FMVSS) 207, Seating Systems, by loading the seat through its upper cross member. The second method utilizes an Anthropometric Test Dummy (ATD) and applies the load to the seat back through the ATD’s lumbar spine; this method is referred to as the Quasistatic Seat Test (QST). Four seat designs were tested utilizing these two quasistatic test methods. The observations and data obtained from these tests are then compared to dynamic test data documented in FMVSS 301, Fuel System Integrity, type rear impact and sled testing.
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Jones, Merrick, Shan Huang, and Jinsong Huang. "A Simplified Method of Incorporating Testing Data and Monitored Behaviour for Predicting Surface Settlement Using Bayesian Back Analysis." In Geo-Risk 2023. Reston, VA: American Society of Civil Engineers, 2023. http://dx.doi.org/10.1061/9780784484975.039.

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8

Huang, Yeu-Jong, and Bai-Tang Lee. "Applying a Practical Method and an Out of Phase Technique to Estimate the Noise Level of Vibration Sensor." In ASME 7th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2004. http://dx.doi.org/10.1115/esda2004-58554.

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The experimental and practical evaluation methods and results for vibration sensor are described in this paper. Because the vibration sensor accelerometer has the feature of low-noise electronics, the testing is performed in the basement of National Measurement Laboratory (NML), in which environmental vibration amplitude is less than 3μm/sec. First we put the sensor on a spring isolator plate with 3 Hz natural frequency and a big concrete mass with 29 Hz peak value to get the high and low frequency noise level separately. Next we mount two same-type sensors back-to-back horizontally. The output signals of the two sensors are out of phase, so we can calculate their noise level easily. Finally we use an air-bearing shaker to generate a low frequency and low amplitude vibration to verify the sensor measurement ability. The noise level of the sensor can be determined by using the practical method and an out of phase technique.
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9

Grubac, Gabrijel, Radu Patrascu, and Laura Precupanu. "Fluid Cool Down vs. Heat Back - An Analysis of Bottomhole Gauge Temperature Responses to Optimize Stimulation Fluid Clean Up and Thereof Testing, Offshore Black Sea." In SPE Annual Technical Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/206313-ms.

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Abstract In an effort of maximizing the production from low permeability reservoirs in mature fields, operators often strive to implement innovative technologies and engineering approaches that can help achieve that goal. This paper presents an analysis of the temperature responses from bottom hole gauges of several horizontal wells that have been stimulated offshore Black Sea. The analysis covers the fluid cool down and heat back profile during stimulation and production. Ultimately, the analysis' goal being to better understand the rheological properties of the stimulation fluid and enhance well clean-up by avoiding miss-allocation of temperature ranges during fluid testing for when the well is brought on production. Based on available data from bottom hole gauges implemented in the horizontal wells stimulated in the Black Sea, an analysis of the temperature gauge responses has been performed. The analysis includes a workflow of temperature change validation per well, considering fluid pumped per port in stimulation phase and fluids produced per port in production phases. The fluid production allocation per port was done utilizing chemical tracer technology results. Stimulation treatments in the same reservoir offshore Black Sea, Romania have been analyzed in terms of bottom hole gauge readings of temperature during the stimulation fluid pumping and during the early production period of each well. A workflow was implemented on each well to correlate fluid per stimulation stage pumped to temperature changes during the treatments. Similar approach was used to correlate the temperature heat back profile during the shut in of wells in the initial 48 hours for proppant curing to the production phase clean-up of the wells. The observed cool down during pumping was of no surprise, but the heat back indicated a slower process of warm back that affects the stimulation fluid testing approach and the understanding of possible near wellbore pressure differentials caused by misallocation of temperature range testing of pre job rheology tests. A combination of temperature data with diagnostic tools and the pertaining analysis will provide a better description of wells' performance. In conclusion, misinterpretation of modelled cool down and reservoir heat back can lead to erroneous understanding of fluid clean up, ultimately affecting reservoir fluid inflow. Understanding the areal temperature response helped optimize fluid testing approach and plan for better clean up. The approach and the sensitivity analysis results are beneficial in understanding the temperature behavior during treatment pumping and production of stimulated wells. This process can enhance an engineer's approach in scrutinizing stimulation fluid testing for improved post stimulation clean up.
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10

Kennedy, C. E., K. Terwilliger, and G. J. Jorgensen. "Furthur Analysis of Accelerated Exposure Testing of Thin-Glass Mirror Matrix." In ASME 2007 Energy Sustainability Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/es2007-36182.

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Анотація:
Concentrating solar power (CSP) companies have deployed thin-glass mirrors produced by wet-silver processes on ∼1-mm-thick, relatively lightweight glass. These mirrors are bonded to metal substrates in commercial installations and have the confidence of the CSP industry. Initial hemispherical reflectance is ∼93%–96%, and the cost is ∼$16.1/m2–$43.0/m2. However, corrosion was observed in mirror elements of operational solar systems deployed outdoors for 2 years. National Renewable Energy Laboratory (NREL) Advanced Materials Team has been investigating this problem. First, it was noted that this corrosion is very similar to the corrosion bands and spots observed on small (45 mm × 67 mm) thin-glass mirrors laminated to metal substrates with several different types of adhesives and subjected to accelerated exposure testing (AET) at NREL. The corrosion appears as dark splotches in the center of the mirror, with a corresponding 5%–20% loss in reflectivity. Secondly, two significant changes in mirror manufacture have occurred in the wet-chemistry process because of environmental concerns. The first is the method of forming a copper-free reflective mirror, and the second is the use of lead-free paints. However, the copper-free process requires stringent quality control and the lead-free paints were developed for interior applications. A test matrix of 84 combinations of sample constructions (mirror type/back-protective paint/adhesive/substrate) was devised for AET as a designed experiment to identify the most-promising mirrors, paints, and adhesives for use with concentrator designs. Two types of accelerated exposure were used: an Atlas Ci5000 WeatherOmeter (CI5000) and a BlueM damp-heat chamber. Based on an analysis of variance (ANOVA), the various factors and interactions were modeled. These samples now have more than 36 months of accelerated exposure, and most samples have completed their test cycle. We will discuss the results of the final exposure testing of these mirror samples. Glass mirrors with copper back-layers and heavily leaded paints have been considered robust for outdoor use. However, the basic mirror composition of the new mirrors is radically different from that of historically durable solar mirrors, and the outdoor durability must be determined.
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Звіти організацій з теми "BACK-TESTING ANALYSIS"

1

Maupin, Julie, and Dr Michael Mamoun. DTPH56-06-T-0004 Plastic Pipe Failure, Risk, and Threat Analysis. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), March 2006. http://dx.doi.org/10.55274/r0012119.

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Reports, publications, papers, and databases were reviewed to better define risks and threats to plastic gas distribution piping. Failure modes were described for plastic PE piping with the most significant being slow crack growth (SCG). Short-term mechanical tests such as tensile, quick burst, melt index, and density tests did not show a correlation with a material's susceptibility to SCG failure. The bend-back test was able to visually identify 1971 low-ductile inner wall materials. PENT test failure times were reported for materials manufactured during the period1972-1985. The PENT test did not show correlations with the material's susceptibility to SCG failure for these materials. Life expectancy was determined to be a key measure of the susceptibility of PE gas pipe materials to SCG field failures. Long-term hydrostatic stress-rupture data combined with the Rate Process Method or with the Bi-Directional Shift Functions predicted the remaining life expectancy of several PE materials at 60�F average field temperature under varying loading conditions. Data showed rock impingement loads and pipe squeeze-offs can result in the greatest reduction in remaining life expectancy. Lower operating field temperatures and pressures significantly increased the predicted remaining life expectancy of PE materials. Fifty-five PE pipe samples that failed in field service were examined in the laboratory to identify the root cause of the failures. Eight of the samples underwent in-depth analysis, which included density and melts index tests and differential scanning calorimetry, infrared spectroscopy, and microscopic examination of the fracture surfaces. The samples were combined with another set of additional data resulting in 45 material, 36 procedural, 12 quality control, and 7 miscellaneous failures. A separate categorization method attributed a total of 321 failures to their respective pipe/component, with most occurring at joints. RCP in large diameter PE materials was investigated through laboratory testing. Critical pressure was determined for 6 pipe materials. The critical temperature was determined for 3 materials.
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