Relevant bibliographies by topics / Quadratic trend

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

Academic literature on the topic 'Quadratic trend'

Author: Grafiati
Published: 4 June 2021
Last updated: 1 February 2022

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Journal articles on the topic "Quadratic trend"

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Hohoff, Eva, Ines Perrar, Nicole Jancovic, and Ute Alexy. "Age and time trends of dairy intake among children and adolescents of the DONALD study." European Journal of Nutrition 60, no. 7 (April 21, 2021): 3861–72. http://dx.doi.org/10.1007/s00394-021-02555-7.

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Abstract Purpose To describe age and time trends in dietary intake of Total Dairy (TD) (g/1000 kcal Total Energy Intake) and types of dairy (weight percent of total dairy intake, w%TD) represented as Low Fat Dairy (LFD), High Sugar Dairy (HSD), Fermented Dairy (FD) and Liquid Dairy (LD) among children and adolescents in Germany. Methods Overall, 10,333 3-day dietary records kept between 1985 and 2019 by 1275 DONALD participants (3.5–18.5 years; boys: 50.8%) were analyzed using polynomial mixed-effects regression models. Results TD intake decreased with age (♂: linear trend p < 0.0001; ♀: linear and quadratic trend p < 0.0001), whereas FD (♀: linear, quadratic, cubic trend p ≤ 0.02) increased slightly in girls. HSD (♂: linear, quadratic, cubic trend p ≤ 0.004; ♀: linear, quadratic, cubic trend p ≤ 0.005) and LD (linear, quadratic trend p ≤ 0.0002) decreased with age. In terms of time trends, TD intake decreased in the last three decades, especially since 1995 (quadratic trend for ♂ 0.0007 and ♀ p = 0.004). LFD intake increased until 2010 and decreased thereafter (linear, quadratic, cubic trend p < 0.0001). HSD decreased until 1995, then increased until 2010 and decreased again afterwards (♂: linear, quadratic, cubic trend p ≤ 0.001; ♀: linear, quadratic, cubic trend p ≤ 0.003). While FD intake increased linear (in both ♂ and ♀: p < 0.0001), LD intake decreased (linear, quadratic trend p ≤ 0.03). Conclusion Our results showed changes in dairy consumption patterns among children and adolescents over the past three decades, demonstrating a decrease in TD intake with age and time, and a shift from liquid to solid dairy products with a simultaneous increase in fermented dairy products, while LFD and HSD fluctuated over time. Further evaluations will examine the health significance of these consumption patterns.
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Harvey, Andrew. "The local quadratic trend model." Journal of Forecasting 29, no. 1-2 (January 2010): 94–108. http://dx.doi.org/10.1002/for.1144.

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Annan, Francis. "A Regional Analysis of Corn Yield Models: Comparing Quadratic versus Cubic Trends." Journal of Economics and Behavioral Studies 3, no. 6 (December 15, 2011): 395–401. http://dx.doi.org/10.22610/jebs.v3i6.296.

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This study investigates county-level corn yield trend models using quadratic and cubic trend estimations. The study empirically revealed that the cubic trend is more appropriate for yield data from the West, Midwest and South regions. The linear and the quadratic trend models were respectively found to be more appropriate for yield data from the Plains and Atlantic regions. Results suggest that the data should be allowed to determine the appropriate trend relationships to avoid trend misspecification. Additionally, the yield trends are found to be inconsistent across all the regions. Different locations tend to exhibit different yield trends. It is therefore recommended that differences between regions be recognized when we conduct yield trend tests and not to generalize our results to other regions.
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Wiens, Stefan, and Stephen N. Palmer. "Quadratic trend analysis and heartbeat detection." Biological Psychology 58, no. 2 (November 2001): 159–75. http://dx.doi.org/10.1016/s0301-0511(01)00110-7.

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El-Geziry, Tarek M., Ibrahim A. Maiyza, and Mohamed S. Kamel. "Behaviour of Temperature Variations in Subsurface Layers in the South-Eastern Mediterranean Sea." ATHENS JOURNAL OF SCIENCES 8, no. 1 (January 20, 2020): 9–22. http://dx.doi.org/10.30958/ajs.8-1-1.

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The present work is a qualitative research, which aims at drawing the general behaviour of variations in the subsurface seawater temperatures within three distinctive subsurface layers in the south-eastern Mediterranean region. The work is based on hydrographic data collected over 65 years (1948–2012). The investigated layers are the subsurface, the intermediate and the deep water layers. The general trend of the mean annual temperature anomaly (MATA) was examined using the linear and quadratic regressions. Results revealed that the MATA over the water column in the south-eastern Mediterranean has the same trend, regardless of the place (layer) of investigation. Linearly, all MATA have increasing trends with different rates, with the exception of the 75 m level, which has a decreasing trend following that previously concluded for the surface water in the region. Also, the quadratic approach reflects the same trend of MATA over the water column, with different years of minimum occurrence. These same trends from the surface to deep can be attributed to the vertical convection processes in this region, and to the expanded impact of solar radiation which may reach more than 30 m depth. Keywords: South-eastern Mediterranean Sea, seawater temperature, linear regression, quadratic regression, cyclic trend
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Rukmini, Rukmini. "Forecasting Sales Cotton and Polyester Yarn at PT. Agung Sejahtera Sukaraharja Karanganyar." JMK (Jurnal Manajemen dan Kewirausahaan) 4, no. 1 (January 18, 2019): 17. http://dx.doi.org/10.32503/jmk.v4i1.357.

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This study aims to determine the sales forecasting and polyester cotton yarn in January 2015 by using the Least Square Method and Method of Quadratic Trend. As well as to determine the most efficient methods of forecasting to predict sales of cotton yarn and polyester products at PT Agung Sejahtera. From the results of analysis based on the calculation of sales forecasts yarn products with sales data from January to December 2014 using the least squares method and quadratic trend method, in which the quadratic trend method is more suitable because it has a value of SKP lows while the predictive value of product sales yarn using trend quadratic result of cotton yarn 40 weaving of 1,538 ball, cotton yarn 40 amounted to 597.504 ball spandex, polyster yarn weaving amounted 411.348 40 ball, 30 Weaving Polyester yarn ball at 336.588.
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Perrar, Ines, Alena M. Schadow, Sarah Schmitting, Anette E. Buyken, and Ute Alexy. "Time and Age Trends in Free Sugar Intake from Food Groups among Children and Adolescents between 1985 and 2016." Nutrients 12, no. 1 (December 20, 2019): 20. http://dx.doi.org/10.3390/nu12010020.

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Trend analyses suggest that free sugar (FS) intake—while still exceeding 10%E—has decreased among German children and adolescents since 2005, yet that intakes may shift from sugars naturally occurring in foods to added sugars as children age. Thus, we analysed time and age trends in FS intake (%E) from food groups among 3–18 year-olds (1985–2016) using 10,761 3-day dietary records from 1312 DONALD participants (660 boys, 652 girls) by use of polynomial mixed-effects regression models. Among girls, FS from sugar & sweets decreased from 1985 to 2016 (linear trend p < 0.0001), but not among boys (p > 0.05). In the total sample, FS intake from juices increased until 2000 and decreased since 2005 (linear, quadratic trend p < 0.0001). FS from sugar sweetened beverages (SSB) decreased non-linearly from 1985 to 2016 (girls: linear, quadratic, cubic trend p < 0.0001; boys: linear, quadratic, cubic trend p < 0.02). Younger children consumed more FS from juices than older ones, who had a higher FS intake from SSB. FS intake from sugar & sweets increased until early adolescence and decreased afterwards. Since sugar & sweets represent the main source of FS intake and the source with the least pronounced decline in intake, public health measures should focus on these products.
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Kojić, Vedran, and Tihana Škrinjarić. "A note on the turning point for the quadratic trend." Croatian Review of Economic, Business and Social Statistics 5, no. 2 (December 1, 2019): 39–48. http://dx.doi.org/10.2478/crebss-2019-0010.

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AbstractThe quadratic trend is a statistical model described by the quadratic function. Finding its extremum (also called the vertex or the turning point) using differential calculus or completing the square method is very well known in the literature. In this paper, a new method for finding the extremum of the quadratic function, based on a simple mathematical inequality is proposed. In comparison with the other two known methods, our method does not require the differentiability assumption and it takes fewer steps than completing the square method. Also, it is shown how the turning point for the quadratic trend can be applied in forecasting the unemployment rate in Croatia in the first quarter of 2019. The obtained conclusions are equal to the conclusions obtained in the usual way by using forecasting software.
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Fu, You, Ryan D. Burns, Emma Gomes, Amy Savignac, and Nora Constantino. "Trends in Sedentary Behavior, Physical Activity, and Motivation during a Classroom-Based Active Video Game Program." International Journal of Environmental Research and Public Health 16, no. 16 (August 7, 2019): 2821. http://dx.doi.org/10.3390/ijerph16162821.

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The purpose of this preliminary study was to investigate trends in children’s sedentary behavior (SB), physical activity (PA), and motivation during a 12 week classroom-based Active Video Game (AVG) program. A sample of 16 children, recruited from an elementary school, participated in AVG for 30 minutes per school day for 12 consecutive weeks. School day time in SB and PA, in addition to step counts, were assessed across 12 weeks using accelerometers and motivation was assessed via questionnaires. Mixed effects models with a quadratic time parameter were employed to examine time trends. A significant negative trend was observed for SB, while light and vigorous PA and step counts yielded positive trends until approximately 8–9 weeks where a quadratic inflection point was observed (p < 0.001). Regarding motivational variables, enjoyment and social support from teachers significantly increased across 12 weeks (p < 0.05). A 12 week classroom AVG program yielded a positive trend in school day light and vigorous PA and step counts, and a negative trend in SB until 8–9 weeks into the program. This study supports the use of low-cost classroom-based AVG programs to improve children’s physical and mental health, but favorable PA trends were attenuated past 8–9 weeks.
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Van Deusen, Paul C. "Comparison of some annual forest inventory estimators." Canadian Journal of Forest Research 32, no. 11 (November 1, 2002): 1992–95. http://dx.doi.org/10.1139/x02-115.

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Three estimators of current status and trend are compared for an annual interpenetrating panel design. The five-panel annual inventory design is simulated over a 10-year period with flat, increasing, and quadratic growth trends. The simulated comparisons show that the mixed estimator performs well relative to the 5-year moving average in terms of bias and mean squared error in all cases. The one-panel mean can have less bias than the moving average when there is a trend, but it is more variable. The moving average tends to lag evolving trends, which can result in very large bias.
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Dissertations / Theses on the topic "Quadratic trend"

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Correia, Joana Matias. "Simple and robust tests of the quadratic break trend hypoteshis for 𝐼(0), 𝐼(1) and 𝐼(2) time series." Master's thesis, Instituto Superior de Economia e Gestão, 2016. http://hdl.handle.net/10400.5/13036.

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Mestrado em Finanças
Esta tese teve como objetivo a construção de uma estatística de teste para a hipótese nula da não existência de quebra na tendência de uma série temporal unidimensional. A sua principal inovação foi o desenvolvimento de um teste robusto não só para a presença de erros I(0) e I(1) mas também para erros I(2). Para isso, construiu-se um modelo quadrático que incluiu uma variável auxiliar, com a mesma ordem, e foram propostos dois testes distintos, um para uma data de quebra conhecida e o outro para uma data de quebra desconhecida. O primeiro é uma média ponderada pelas estatísticas de teste apropriadas para o caso em que os erros são I(0), I(1) ou I(2). Esta estatística de teste tem uma distribuição normal padrão. O segundo é uma média ponderada que se obtém depois de encontrado o supremo sobre todas as possíveis datas de quebra, sujeitas a um parâmetro delimitador da amostra. Neste caso, os valores críticos foram calculados através de simulação de Monte Carlo. A metodologia de Harvey et al. (2009) foi seguida em ambos os cenários. Mais ainda, conceitos sobre convergência assintótica para processos com duas raízes unitárias foram revistos e algumas propriedades assintóticas de regressões, com uma ou duas raízes unitárias, foram derivadas. Os testes desenvolvidos têm aplicação no estudo de séries económicas e financeiras.
The aim of this thesis was the construction of a test statistic for the null hypothesis of no break in trend in an univariate time series. The breakthrough was to make the test robust not only for the presence of I(0) and I(1) shocks but also for the I(2) case scenario. For this reason, a quadratic trend break model and a quadratic dummy variable were designed. The assumption of known or unknown break date motivated the construction of two separate test statistics. The former is a weighted average of the appropriate t-statistics for the case of I(0), I(1) and I(2) shocks and it was shown to have standard normal limiting distribution. The latter is a weighted average of the statistics formed as the supremum over all possible break dates, subject to a trimming parameter. In addition, the critical values for this test statistic were computed through Monte Carlo simulation. The general framework of Harvey et al. (2009) was adopted to test for the presence of a break under a known or unknown break date. At the same time, asymptotic theory for I(2) processes was reviewed and simple asymptotic properties of second and first order auto-regressions were derived. The tests can be applied to the study of financial and economic time series.
info:eu-repo/semantics/publishedVersion
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Raclavský, Lukáš. "Statistická analýza rizikových finančních faktorů podniku." Master's thesis, Vysoké učení technické v Brně. Ústav soudního inženýrství, 2014. http://www.nusl.cz/ntk/nusl-232929.

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The master´s thesis contains a statistical analysis of a company financial risk. Within this analysis were determined the dominant economic and financial risk factors of a company and was made a description of selected inferential statistical methods adequate assessment of the state and time development of these indicators. On a PC was applied methodics developed for concrete data files with focusing on description of the expected risk development existence of a company. In conclusion were achievements evaluated and were determined another possible directions of solving similar problems.
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Kitchen, Ryan L. "Improving Steering Module Efficiency for Incremental Loading Finite Element Numeric Models." Diss., CLICK HERE for online access, 2006. http://contentdm.lib.byu.edu/ETD/image/etd1248.pdf.

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O, Pai-Kuei, and 歐百貴. "Formulate Searching for Trend-Free Block Designs as a Quadratic Binary Optimization Problem." Thesis, 2002. http://ndltd.ncl.edu.tw/handle/v2nc3a.

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JIANG, YU-CHI, and 江育綺. "Portfolio Optimization Considering Diversified Investment Methods Using ANGEL-QTS and Trend Ratio on Quadratic Regression." Thesis, 2019. http://ndltd.ncl.edu.tw/handle/hvs23t.

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碩士
國立暨南國際大學
資訊工程學系
107
In the stock selection problem, the Sharpe ratio is one of the commonly used indicators, but it tends to identify the portfolio with a flat trend as the best one. This paper uses the linear trend ratio to access the portfolio with a stable upward trend. The trend ratio uses the trend line to assess the portfolio return and risk. However, the trend ratio with linear regression only roughly depict the portfolio trend. This paper proposes the quadratic trend ratio, utilizing the quadratic regression to find the portfolio trend curve. Therefore, the quadratic trend ratio can assess the portfolio return and risk more accurately. In addition to the access indicator, this paper provides diversified investments such as time deposit, buying round lots or buying odd lots. Different situation suits different investment method. Thus, this paper applies the 2-phase investment sliding windows to avoid the overfitting problem and chooses the best investment method by multiple training using Entanglement Local Search on Adaptive Global-best Guided Quantum-inspired Tabu Search with Not Gate (ANGEL-QTS) to find the best portfolio effectively and efficiently. Furthermore, the experimental results show that the proposed method can find the well-performing portfolio with higher return and lower risk in both the training and testing periods.
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Lai, Yi-Sheng, and 賴意昇. "An Evolutionary Algorithm on Finding Nearly A-Optimal One-way Layout in the Presence of a Quadratic Trend." Thesis, 2005. http://ndltd.ncl.edu.tw/handle/70625886083289995088.

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碩士
逢甲大學
統計與精算所
93
In one-way experimental design, the response variable may be influenced by a quadratic trend. In order to estimate the treatment differences as accurately as possible, we should minimize the average of variance of treatment comparison, which is the idea of A-optimal design, through applying proper allocation of treatments to the experiment units. In this thesis,the evolutionary algorithm is considered to find nearly A-optimal one-way layout in the presence of a quadratic trend. Evolutionary algorithms have been successfully applied to optimal problems in literature. Choosing the right parameters of evolutionary algorithms, however, is a time-consuming task. Therefore, we adopt parameters which are suggested by literature. We test the evolutionary algorithm by 15 one-way layout plans. The A-efficiency of designs found by the evolutionary algorithm is exceeded 99%. It means that the evolutionary algorithm performed very well on finding nearly A-optimal one-way designs.
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Book chapters on the topic "Quadratic trend"

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Jelassi, Mohamed Nader. "A Quadratic Approach for Trend Detection in Folksonomies." In Web Reasoning and Rule Systems, 278–83. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-33203-6_32.

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Nguyen, Hop D., and Thanh Vu. "Regularity of Products over Quadratic Hypersurfaces." In Trends in Mathematics, 129–32. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45441-2_22.

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Yakubovich, V. A. "Universal Regulators in Linear-Quadratic Optimization Problems." In Trends in Control, 53–68. London: Springer London, 1995. http://dx.doi.org/10.1007/978-1-4471-3061-1_3.

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Chakraborty, Kalyan, and Azizul Hoque. "Quadratic Reciprocity and Some “Non-differentiable” Functions." In Trends in Mathematics, 145–81. Singapore: Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-4337-6_8.

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Levajković, Tijana, and Hermann Mena. "On Deterministic and Stochastic Linear Quadratic Control Problems." In Trends in Mathematics, 315–22. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-12577-0_37.

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Rolen, Larry, and Karen Taylor. "Richaud–Degert Real Quadratic Fields and Maass Waveforms." In Trends in Mathematics, 655–72. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-57050-7_35.

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Chakraborty, Kalyan, Azizul Hoque, and Richa Sharma. "Divisibility of Class Numbers of Quadratic Fields: Qualitative Aspects." In Trends in Mathematics, 247–64. Singapore: Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-13-3013-1_12.

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Horozov, Ivan. "Periods of Mixed Tate Motives over Real Quadratic Number Rings." In Trends in Mathematics, 189–98. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-63594-1_19.

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Bruce, J. W., V. V. Goryunov, and V. M. Zakalyukin. "Sectional Singularities and Geometry of Families of Planar Quadratic Forms." In Trends in Singularities, 83–97. Basel: Birkhäuser Basel, 2002. http://dx.doi.org/10.1007/978-3-0348-8161-6_3.

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Ren, Guangbin, Xieping Wang, and Zhenghua Xu. "Slice Regular Functions on Regular Quadratic Cones of Real Alternative Algebras." In Trends in Mathematics, 227–45. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42529-0_13.

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Conference papers on the topic "Quadratic trend"

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Kuo, Shu-Yu, Xin Jie Cheam, Yu-Chi Jiang, Yun-Ting Lai, Keh-Ning Chang, and Yao-Hsin Chou. "Portfolio optimization Model using ANQTS with Trend Ratio on Quadratic Regression." In 2019 IEEE International Conference on Systems, Man and Cybernetics (SMC). IEEE, 2019. http://dx.doi.org/10.1109/smc.2019.8914008.

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Xu, Ming Cai, Zi Xuan Zhang, Xiao Qiang Zhang, Jin Pan, and Yi Fei Huang. "Numerical Study on the Dynamical Characteristic and Impact Force Between Vessel With Rake Bow and Bridge Pier." In ASME 2019 38th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/omae2019-95602.

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Abstract The possibility of collisions between vessels and bridges has an unavoidable increase, which may cause significant economic losses and sometimes even casualties. The finite element method is used to simulate the impact process between the vessel with raked bow and bridge pier. The influence of parameter on the structural response and impact force is discussed, including the impact velocity, angle, mass of vessel, and the shape of bridge. The relationship of collision force and energy of impact vessel is investigated. It is found that the collision energy shows a quadratic growth trend with the increase of vessel velocity.
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Alijani, F., and M. Amabili. "Large Amplitude Vibrations of Completely Free Rectangular Plates." In ASME 2012 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2012. http://dx.doi.org/10.1115/imece2012-89724.

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Nonlinear forced vibrations of completely free rectangular plates are studied using multi-modal Lagrangian approach. Nonlinear higher-order shear deformation theory is used and the nonlinear response to transverse harmonic excitation in the frequency neighborhood of the fundamental mode is investigated. Geometric imperfections are taken into account. The analysis is carried out in two steps. First, the plate displacements and rotations are expanded in terms of Chebyshev polynomials and a linear analysis is conducted to obtain the natural frequencies and mode shapes. Then, the energy functional is discretized by using the natural modes of vibration and a system of nonlinear ordinary differential equations with cubic and quadratic nonlinear terms is obtained. A pseudo arc-length continuation and collocation scheme is employed to carry out a bifurcation analysis. The effect of number of modes retained in the approximation, thickness ratio and geometric imperfections on the trend of nonlinearity is discussed.
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Yang, F., R. Sedaghati, and Ebrahim Esmailzadeh. "Random Vibration Suppression of Non-Uniform Curved Beams Using Optimal Tuned Mass Damper." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35830.

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Beam type structures have many applications in mechanical, aerospace and civil engineering fields. Due to low damping and recent trend for light weight design (especially for aerospace vehicles and transportation systems), these structures may easily vibrate in their low natural frequencies which may subsequently lead to failure of structure. Thus vibration control of these structures is a very important task which should be considered in preliminary structural design optimization. One of the engineering concerns is to design non-uniform beam type structures with changing geometry. In this study, the structural vibration analysis and design of a curved beam with attached tuned mass dampers under random excitations are presented. The finite element formulation of the curved beam with attached tuned mass dampers has been derived and combined with Sequential Quadratic Programming optimization algorithm to find optimal design variables in tuned mass dampers to minimize the vibration. Illustrative examples are provided to demonstrate the methodology.
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Valero Solis, Susana, Roser Granero Perez, Susana Jimenez Murcia, and Fernando Fernandez Aranda. "Association of the patients’ age with cognitive bias and impulsivity in gambling disorder." In 22° Congreso de la Sociedad Española de Patología Dual (SEPD) 2020. SEPD, 2020. http://dx.doi.org/10.17579/sepd2020o004.

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Background and aims. Typical cognitive biases (irrational beliefs, cognitive distortions and erroneous perceptions) and high levels of impulsivity have been systematically reported among individuals with problem gambling. The objective of this study is to examine the role of the chronological age into the relationships between cognitive biases and impulsivity with the gambling disorder (GD) profile during adulthood. Methods. The sample analysed in this study included n=209 patients into the range age 18-77 yrs-old, recruited at the Pathological Gambling Outpatients Unit of the Bellvitge University Hospital (Barcelona). Results. Path-analysis showed a mediational link between chronological age, the presence of a comorbid depression or anxiety disorder, and the level of GD symptoms. Orthogonal polynomial contrasts showed a positive quadratic trend between the individuals’ age and cognitive distortions severity (higher impairing irrational beliefs obtained among younger and older patients, compared to middle-age patients). The sensation-seeking level showed a negative linear trend with the age: the older the patient’s age, the lower the score in this impulsivity domain. Among younger age patients gambling severity correlated only with cognitive bias levels, while during middle age patients gambling severity correlated with both cognitive bias and impulsivity levels. Within older age group fewer and poorer associations were found between cognitive bias and impulsivity with the accumulated debts due to the gambling activity, and the bets per gambling-episode. Conclusion. The results of this study could help in the development of reliable/valid assessment tools for GD, as well as for the design of precise/effective intervention plans and guidelines. These should include the patients’ age, the cognitive style, and the impulsivity levels, with the aim of providing precise and accurate tools to manage gambling problems.
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Nicolas, Jean, Noureddine Atalla, Olivier Foin, and Alain Berry. "Structural Acoustic Design." In ASME 1995 Design Engineering Technical Conferences collocated with the ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/detc1995-0451.

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Abstract Nowadays, acoustic quietening of manufactured products is gaining importance. Due to cost, severe weight and operational constraints, classical noise control techniques, although still usable, are becoming less attractive. Nowadays, engineers follow essentially two major approaches (i) reduce noise by passive means, design modifications of structures and systems (ii) reduce noise by active sound and vibration control. This paper is devoted to the structural acoustic design approach for which there are either some simple rules of thumb either huge numerical codes. The main objective of this paper is to bridge the gap between these two extremes. For the vibration response, the approach is based on a variational method. The basic structure is a plate with several degrees of complexity: added local or distributed masses, added local or distributed stiffeners, added stiffeners, added damping and constrained layer damping, force and moment type of excitations. The general trend has been to model an equivalent plate with two objectives in mind: (i) numerical calculations may be performed on a P.C., (ii) results are as close as possible to the exact solution. For the acoustic radiation, a novel approach has been used based on Berry’s idea (Berry, 1994) to develop the Green function in terms of a Taylor expansion. Analytical impedance functions may then be calculated for various aspect ratios and then extracted directly from files which allow considerable atime gains over any other rigorous approaches. The A.D.N.R. (Acoustic Design Noise Reduction) code has been validated through several experimental steps and agreement is revealed to be quite good. Not only is A.D.N.R. precise, but it also covers a wide frequency range (low, medium and high frequencies) which is really an advantage. The output data are diversified and among them we may cite: modal shape, operating deflection shape, quadratic velocity, radiation factor and overall sound power. In practice, A.D.N.R. revealed itself to be a great tool at the pre-design stage, when clear and quick trends are needed.
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Yadlapalli, Ravindranath Tagore, and Anuradha Kotapati. "Efficieny analysis of Quadratic buck converter for LED lamp driver applications." In 2017 International Conference on Trends in Electronics and Informatics (ICOEI). IEEE, 2017. http://dx.doi.org/10.1109/icoei.2017.8300917.

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Baby, Binil, and Thanuja Mary Abraham. "Bidirectional Buck-Boost Quadratic Converter Using Fuzzy Controller for Distributed Generation Systems." In 2018 International Conference on Current Trends towards Converging Technologies (ICCTCT). IEEE, 2018. http://dx.doi.org/10.1109/icctct.2018.8551025.

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Khudher, Dhayaa, and Roger Powell. "Quadratic programming for inverse kinematics control of a hexapod robot with inequality constraints." In 2016 International Conference on Robotics: Current Trends and Future Challenges (RCTFC). IEEE, 2016. http://dx.doi.org/10.1109/rctfc.2016.7893402.

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Moni, Bindu S., and G. Raju. "Modified quadratic classifier for Handwritten Malayalam Character recognition using Run Length Count." In 2011 International Conference on Emerging Trends in Electrical and Computer Technology (ICETECT 2011). IEEE, 2011. http://dx.doi.org/10.1109/icetect.2011.5760188.

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