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Articles de revues sur le sujet « Systematic deviations »

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Auteur : Grafiati
Publié le 11 mars 2023

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1

Jadayel, Moustapha, et Farbod Khameneifar. « Improving Geometric Accuracy of 3D Printed Parts Using 3D Metrology Feedback and Mesh Morphing ». Journal of Manufacturing and Materials Processing 4, no 4 (29 novembre 2020) : 112. http://dx.doi.org/10.3390/jmmp4040112.

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Additive manufacturing (AM), also known as 3D printing, has gained significant interest due to the freedom it offers in creating complex-shaped and highly customized parts with little lead time. However, a current challenge of AM is the lack of geometric accuracy of fabricated parts. To improve the geometric accuracy of 3D printed parts, this paper presents a three-dimensional geometric compensation method that allows for eliminating systematic deviations by morphing the original surface mesh model of the part by the inverse of the systematic deviations. These systematic deviations are measured by 3D scanning multiple sacrificial printed parts and computing an average deviation vector field throughout the model. We demonstrate the necessity to filter out the random deviations from the measurement data used for compensation. Case studies demonstrate that printing the compensated mesh model based on the average deviation of five sacrificial parts produces a part with deviations about three times smaller than measured on the uncompensated parts. The deviation values of this compensated part based on the average deviation vector field are less than half of the deviation values of the compensated part based on only one sacrificial part.
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Cuijpers, Raymond H., Astrid M. L. Kappers et Jan J. Koenderink. « Large Systematic Deviations in Visual Parallelism ». Perception 29, no 12 (décembre 2000) : 1467–82. http://dx.doi.org/10.1068/p3041.

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Teixeira, Jeffrey, Victor Certal, Edward T. Chang et Macario Camacho. « Nasal Septal Deviations : A Systematic Review of Classification Systems ». Plastic Surgery International 2016 (11 janvier 2016) : 1–8. http://dx.doi.org/10.1155/2016/7089123.

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Objective. To systematically review the international literature for internal nasal septal deviation classification systems and summarize them for clinical and research purposes. Data Sources. Four databases (including PubMed/MEDLINE) were systematically searched through December 16, 2015. Methods. Systematic review, adhering to PRISMA. Results. After removal of duplicates, this study screened 952 articles for relevance. A final comprehensive review of 50 articles identified that 15 of these articles met the eligibility criteria. The classification systems defined in these articles included C-shaped, S-shaped, reverse C-shaped, and reverse S-shaped descriptions of the septal deviation in both the cephalocaudal and anteroposterior dimensions. Additional studies reported use of computed tomography and categorized deviation based on predefined locations. Three studies graded the severity of septal deviations based on the amount of deflection. The systems defined in the literature also included an evaluation of nasal septal spurs and perforations. Conclusion. This systematic review ascertained that the majority of the currently published classification systems for internal nasal septal deviations can be summarized by C-shaped or reverse C-shaped, as well as S-shaped or reverse S-shaped deviations in the anteroposterior and cephalocaudal dimensions. For imaging studies, predefined points have been defined along the septum. Common terminology can facilitate future research.
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Speakman, Skyler, Girmaw Abebe Tadesse, Celia Cintas, William Ogallo, Tanya Akumu et Adebayo Oshingbesan. « Detecting Systematic Deviations in Data and Models ». Computer 56, no 2 (février 2023) : 82–92. http://dx.doi.org/10.1109/mc.2022.3213209.

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Stefanie, H., N. Ajtai, A. Radovici, D. Ene et L. Belegante. « Assessing the Long Term Stability of the Depolarization Constant for the Cluj Station ». EPJ Web of Conferences 237 (2020) : 08006. http://dx.doi.org/10.1051/epjconf/202023708006.

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The study aims to assess the additional systematic error caused by the assessment of the depolarization constant. Based on the long time assessment of this constant, a mean value and a standard deviation can be retrieved. A sensitivity study could assess the deviation of the depolarization value in high and low depolarizing atmospheric layers. Based on these deviations, the systematic error of the calibration is retrieved and included in the final depolarization products.
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Kappers, Astrid M. L. « Large systematic deviations in the haptic perception of parallelity ». Perception 28, no 8 (1999) : 1001–12. http://dx.doi.org/10.1068/p2802.

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Kappers, Astrid M. L. « Large Systematic Deviations in the Haptic Perception of Parallelity ». Perception 28, no 8 (août 1999) : 1001–12. http://dx.doi.org/10.1068/p281001.

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Timofeyev, I. « Systematic deviations from Gaussianity in models of quasigeostrophic turbulence ». Physics of Fluids 19, no 11 (novembre 2007) : 116603. http://dx.doi.org/10.1063/1.2815728.

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Pechenin, Vadim Andreevich, Michael Alexandrovich Bolotov et N. V. Ruzanov. « Technique of Decomposition of Form Deviation for Freeform Surfaces ». Key Engineering Materials 685 (février 2016) : 334–39. http://dx.doi.org/10.4028/www.scientific.net/kem.685.334.

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This paper presents the technique of decomposition of form deviation based on the use of wavelet filter and Fourier transform. The method allows decomposing the total deviation into systematic, random systematic (waviness) and random components. The method testing was carried out for the statistics of the deviation of the suction side of the turbine engine compressor blade. The accuracy check of the estimates of form deviations generated by the method in a series of simulated surfaces with pre-laid characteristics was carried out. The results showed that the method of decomposition allows one to estimate exactly the components of the form deviation of the simulated surfaces in their series.
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10

Wolfe, Christopher J., Elaine G. Mauldin et Michelle Chandler Diaz. « Concede or Deny : Do Management Persuasion Tactics Affect Auditor Evaluation of Internal Control Deviations ? » Accounting Review 84, no 6 (1 novembre 2009) : 2013–37. http://dx.doi.org/10.2308/accr.2009.84.6.2013.

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ABSTRACT: In an internal control audit, the consequences and assessment subjectivity of control problems motivate managers to try to persuade auditors to lower the assessed severity of an observed control deviation. We report an experiment in which 106 audit seniors evaluate either information technology (IT) or manual control deviations that are potentially indicative of significant deficiencies, after exposure to persuasion tactics based in either concession or denial. For IT control deviations, we find that auditors assess the significance of deficiency lower and the perceived adequacy of management's explanation higher for concessions than for denials. For manual control deviations, we find no differences between concessions and denials. Our results provide evidence of a systematic bias in auditor judgment and indicate a rationale for the ubiquity of management persuasion attempts around control deviations—sometimes they work.
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Dyakonov, J., K. Mishchenko, A. Hering, G. Unger, J. Korecký, K. Melka, J. Zoubková et al. « Interlaboratory Tests of X-Ray Quantitative Phase Analysis ». Powder Diffraction 7, no 3 (septembre 1992) : 137–41. http://dx.doi.org/10.1017/s0885715600018480.

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AbstractThe results of an international project involving five countries and seven laboratories performing over 400 analyses for testing the interlaboratory reproducibility and accuracy using quantitative powder diffraction are presented in this report. Four natural and four artificial mineral mixtures were examined. The RIR (reference intensity ratio) values for all mineral components were either measured or calculated. The relative standard deviation of the interlaboratory determinations range from 5 to 20 percent (for low concentrations, the relative standard deviations can attain 60% percent). Due to systematic errors, the relative standard deviations of the interlaboratory determinations generally exceed the standard deviations determined by individual laboratories. The best results were obtained when the RIR values were measured independendy in each laboratory.
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Hartmann, Christoph, Philipp Lechner, Benjamin Himmel, Yannick Krieger, Tim C. Lueth et Wolfram Volk. « Compensation for Geometrical Deviations in Additive Manufacturing ». Technologies 7, no 4 (2 décembre 2019) : 83. http://dx.doi.org/10.3390/technologies7040083.

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The design of additive manufacturing processes, especially for batch production in industrial practice, is of high importance for the propagation of new additive manufacturing technology. Manual redesign procedures of the additive manufactured parts based on discrete measurement data or numerical meshes are error prone and hardly automatable. To achieve the required final accuracy of the parts, often, various iterations are necessary. To address these issues, a data-driven geometrical compensation approach is proposed that adapts concepts from forming technology. The measurement information of a first calibration cycle of manufactured parts is the basis of the approach. Through non-rigid transformations of the part geometry, a new shape for the subsequent additive manufacturing process was derived in a systematic way. Based on a purely geometrical approach, the systematic portion of part deviations can be compensated. The proposed concept is presented first and was applied to a sample fin-shaped part. The deviation data of three manufacturing cycles was utilised for validation and verification.
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Bruno, Nicola, Valentina Gabriele, Tiziana Tasso et Marco Bertamini. « ‘Selfies’ Reveal Systematic Deviations from Known Principles of Photographic Composition ». Art & ; Perception 2, no 1-2 (2014) : 45–58. http://dx.doi.org/10.1163/22134913-00002027.

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We used ‘selfies’, self-portraits taken with a hand-held smartphone camera, to test three known principles of photographic composition: The rule of thirds, the golden ratio rule, and the eye centering principle. Although they are often taught and discussed, the origin of these principles remains unclear. It is possible that they stem from constraints on human perceptual processes. Alternatively, these principles might serve more practical purposes, such as forcing photographers to explore all quadrants of the image. Selfies provide an ideal test bed for these questions due to the control they give self-photographers when they compose the photograph. We used a database of images created by non-professional photographers (). After analysis, we conclude that there little support for any of the three principles, suggesting that none is strongly rooted in spontaneous perceptual preferences.
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Horvath, H. « Systematic deviations of light absorption measurements by filter transmission methods ». Journal of Aerosol Science 28 (septembre 1997) : S55—S56. http://dx.doi.org/10.1016/s0021-8502(97)85028-8.

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Wyers, Lore, Patricia Van de Walle, Aurélie Hoornweg, Ionela Tepes Bobescu, Karen Verheyen, Berten Ceulemans, An-Sofie Schoonjans, Kaat Desloovere et Ann Hallemans. « Gait deviations in patients with dravet syndrome : A systematic review ». European Journal of Paediatric Neurology 23, no 3 (mai 2019) : 357–67. http://dx.doi.org/10.1016/j.ejpn.2019.03.003.

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Phillips, Adam, et Shane McClinton. « Gait deviations associated with plantar heel pain : A systematic review ». Clinical Biomechanics 42 (février 2017) : 55–64. http://dx.doi.org/10.1016/j.clinbiomech.2016.12.012.

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Markov, N. N., et N. B. Gipp. « Systematic error in measuring deviations from rectilinearity in an axis ». Measurement Techniques 30, no 6 (juin 1987) : 515–18. http://dx.doi.org/10.1007/bf00866836.

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Araujo-Corchado, Elena, et Beatriz Pardal-Peláez. « Computer-Guided Surgery for Dental Implant Placement : A Systematic Review ». Prosthesis 4, no 4 (26 septembre 2022) : 540–53. http://dx.doi.org/10.3390/prosthesis4040044.

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Implant therapy is currently the treatment of choice for the replacement of missing teeth. Correct implant positioning is of vital importance. To this end, radiographic techniques providing 3D information and guided surgery techniques, both static and dynamic, have been developed. The primary objective of this work is to study whether placing dental implants in partially edentulous patients with guided surgery techniques results in less, equal or greater precision than placing them freehand. The secondary objectives are to gain an understanding of the advantages and disadvantages, indications, limitations, and complications of this type of surgery. A literature search was performed in Pubmed and BVS, and six randomized clinical trials meeting the marked inclusion criteria were included. The different guided surgery techniques were compared with each other and with the traditional method. Freehand surgery was found to be the least accurate, as the implants placed with this technique showed the largest deviations between the planned position and the final position, both when calculating the global (3D) deviation and when measuring the deviation in each of the axes (vertical, mesio-distal, bucco-lingual and lateral), and the angular deviation and voxel overlap. In contrast, the most accurate surgeries were fully guided and half-guided, with the smallest deviations between the planned and final implant position. With any guided surgery technique, more precise implant positioning is achieved than with freehand placement. Advantages include reduced trauma and surgery time; disadvantages include reduced primary implant stability and higher cost. This type of surgery is more indicated in cases of critical anatomy, but may encounter limitations in terms of cost, degree of buccal opening, visibility and adjustment of the guides and the need for prior familiarization with the procedure. Nevertheless, this surgical technique reduces the complication rate.
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Jacobsen, F., et H. Ding. « Observations on the Systematic Deviations between Two Methods of Measuring Sound Transmission Loss ». Building Acoustics 3, no 1 (mars 1996) : 1–11. http://dx.doi.org/10.1177/1351010x9600300101.

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The paper examines and discusses possible explanations of the systematic deviations between conventional and intensity-based sound transmission loss measurements frequently reported in the literature. Both the conventional diffuse-field method and the method based on the sound intensity technique are subject to several systematic errors of comparable size. The sources of error include non-linear decay functions, the absorption of the partition itself, and intensity measurement errors, which are aggravated by the fact that the sound field conditions are usually fairly difficult. It is concluded that with very careful measurement procedures there are no systematic deviations.
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Carosi, Paolo, Claudia Lorenzi, Fabrizio Lio, Pierluigi Cardelli, Alessandro Pinto, Andrea Laureti et Alessandro Pozzi. « Accuracy of Computer-Assisted Flapless Implant Placement by Means of Mucosa-Supported Templates in Complete-Arch Restorations : A Systematic Review ». Materials 15, no 4 (16 février 2022) : 1462. http://dx.doi.org/10.3390/ma15041462.

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The aim of this study was to systematically review the current scientific literature regarding the accuracy of fully guided flapless implant positioning for complete-arch rehabilitations in edentulous patients and to assess if there was any statistically significant correlation between linear deviation at shoulder point, at apex point and angular deviation. The electronic and manual literature search of clinical studies was carried out using specified indexing terms. A total of 13 studies were eligible for qualitative analysis and 277 edentulous patients were rehabilitated with 1556 implants patients by means of fully guided mucosa-supported template-assisted flapless surgery. Angular deviation was 3.42° (95% CI 2.82–4.03), linear deviation at shoulder point 1.23 mm (95% CI 0.97–1.49) and linear deviation at apex point 1.46 mm (95% CI 1.17–1.74). No statistically significant correlations were found between the linear and angular deviations. A statistically significant correlation was found between the two linear deviations (correlation coefficient 0.91) that can be summarized by the regression equation y = 0.03080 + 0.8254x. Computer-assisted flapless implant placement by means of mucosa-supported templates in complete arch restorations can be considered a reliable and predictable treatment choice despite the potential effects that flapless approach could bring to the overall treatment.
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FIELD, J. H., et D. SCIARRINO. « A STUDY OF THE LEP AND SLD MEASUREMENTS OF Ab ». Modern Physics Letters A 15, no 11n12 (20 avril 2000) : 761–74. http://dx.doi.org/10.1142/s0217732300000748.

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A systematic study is made of the data dependence of the parameter A b , that, since 1995, has shown a deviation from the Standard Model prediction of between 2.4 and 3.1 standard deviations. Issues addressed include: The effect of particular measurements, values found by individual experiments, LEP/SLD comparison, and the treatment of systematic errors. The effect, currently at the 2.4σ level, is found to vary in the range from 1.7σ to 2.9σ by excluding marginal or particularly sensitive data. Since essentially the full LEP and SLD Z-decay data sets are now analyzed the meaning of the deviation, (new physics or marginal statistical fluctuation) is unlikely to be given by the present generation of colliders.
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Davies, Matthew, Guy Madison, Pedro Silva et Fabien Gouyon. « The Effect of Microtiming Deviations on the Perception of Groove in Short Rhythms ». Music Perception 30, no 5 (décembre 2012) : 497–510. http://dx.doi.org/10.1525/mp.2013.30.5.497.

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Groove is a sensation of movement or wanting to move when we listen to certain types of music; it is central to the appreciation of many styles such as Jazz, Funk, Latin, and many more. To better understand the mechanisms that lead to the sensation of groove, we explore the relationship between groove and systematic microtiming deviations. Manifested as small, intentional deviations in timing, systematic microtiming is widely considered within the music community to be a critical component of music performances that groove. To investigate the effect of microtiming on the perception of groove we synthesized typical rhythm patterns for Jazz, Funk, and Samba with idiomatic microtiming deviation patterns for each style. The magnitude of the deviations was parametrically varied from nil to about double the natural level. In two experiments, untrained listeners and experts listened to all combinations of same and different music and microtiming style and magnitude combinations, and rated liking, groove, naturalness, and speed. Contrary to a common and frequently expressed belief in the literature, systematic microtiming led to decreased groove ratings, as well as liking and naturalness, with the exception of the simple short-long shuffle Jazz pattern. A comparison of the ratings between the two listener groups revealed this effect to be stronger for the expert listener group than for the untrained listeners, suggesting that musical expertise plays an important role in the perception and appreciation of microtiming in rhythmic patterns.
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Goudriaan, Marije, Marleen Van den Hauwe, Joyce Dekeerle, Louise Verhelst, Guy Molenaers, Nathalie Goemans et Kaat Desloovere. « Gait deviations in Duchenne muscular dystrophy—Part 1. A systematic review ». Gait & ; Posture 62 (mai 2018) : 247–61. http://dx.doi.org/10.1016/j.gaitpost.2018.03.020.

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Woeger, Wolfgang. « Probability assignment to systematic deviations by the Principle of Maximum Entropy ». IEEE Transactions on Instrumentation and Measurement IM-36, no 2 (juin 1987) : 655–58. http://dx.doi.org/10.1109/tim.1987.6312762.

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Berger, H., P. Möck et B. Rosner. « Description and Interpretation of Systematic Deviations from Epitaxial Laws of Overgrowth ». Acta Physica Polonica A 84, no 2 (août 1993) : 279–86. http://dx.doi.org/10.12693/aphyspola.84.279.

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Powell, K. Skylar. « Understanding ‘Misfits’ : Aspirations and Systematic Deviations from Firm-Specific Optimal Multinationality ». Management International Review 57, no 4 (24 janvier 2017) : 529–44. http://dx.doi.org/10.1007/s11575-017-0310-6.

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Sreeram Reddy, G., V. V. Satyanarayana, M. Manzoor Hussian et J. Jagadesh Kumar. « Response prediction of reverse engineered free form surface by design of experiments ». Journal of Mechanical Engineering and Sciences 12, no 4 (27 décembre 2018) : 4231–42. http://dx.doi.org/10.15282/jmes.12.4.2018.18.0364.

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Reverse engineering is a new technique employed in product design wherein original drawings or pertinent technical data are not available. Reverse engineering technology acquires the conceptual designs from the existing products and consequently creates digital product models. In the product design these digital products are employed with optimization principles. The investigation in this paper encompasses 3-D reconstruction of products by the reverse engineering technique and consequently identifying the deviations between the original product and the reverse engineered model. Design of experiments is a systematic study in the consideration of the governing parameters and there by arriving at the optimization stage. In this investigation response surface methodology method is employed by taking the input parameters viz noise level, smoothing level and triangle count %; and there by identified the responses namely deviation and curvature deviation occurred from the existing physical model. The deviations and curvature deviations are in the range 0.0266 to 0.0621 mm and 0.543 (54.3%) to 0.645 (64.5%) respectively which indicate that the reverse engineered freeform surface is not exhibiting significant difference when compared to the original CAD model. Response surface contours are constructed for determining the optimum process conditions.
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Ballach, Katharina, Ralf Christoph et Robert H. Schmitt. « Rückführung von Messergebnissen in den Konstruktionsprozess/Partially automated mould correction for plastic injection moulding – Feedback of measurement results into the design process ». wt Werkstattstechnik online 111, no 11-12 (2021) : 776–80. http://dx.doi.org/10.37544/1436-4980-2021-11-12-6.

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Die Geometrie von Kunststoffspritzgußwerkstücken wird durch Abkühlung der Schmelze bei der Fertigung beeinflusst. Die hieraus resultierende Geometrieabweichung wird mittels Simulation abgeschätzt und bei der Konstruktion berücksichtigt. Trotz der eingesetzten Verfahren sind Abweichungen zwischen Soll- und Ist-Geometrie häufig zu groß. Durch Rückführung von Messergebnissen in den Konstruktionsprozess werden systematische Abweichungen reduziert. Aufwendige manuelle Verfahren können so entfallen.   The geometry of plastic injection molded workpieces is influenced by cooling of the melt during production. The resulting geometry deviation is estimated by means of simulation and taken into account in the design. Despite the methods used, deviations between nominal and actual geometry are often too high. Systematic deviations are reduced by feeding measurement results back into the design process. Time-consuming manual procedures can thus be eliminated.
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Wu, Xinxing, Xiong Wang et Guanrong Chen. « On the Large Deviations Theorem of Weaker Types ». International Journal of Bifurcation and Chaos 27, no 08 (juillet 2017) : 1750127. http://dx.doi.org/10.1142/s0218127417501279.

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In this paper, we introduce the concepts of the large deviations theorem of weaker types, i.e. type I, type I[Formula: see text], type II, type II[Formula: see text], type III, and type III[Formula: see text], and present a systematic study of the ergodic and chaotic properties of dynamical systems satisfying the large deviations theorem of various types. Some characteristics of the ergodic measure are obtained and then applied to prove that every dynamical system satisfying the large deviations theorem of type I[Formula: see text] is ergodic, which is equivalent to the large deviations theorem of type II[Formula: see text] in this regard, and that every uniquely ergodic dynamical system restricted on its support satisfies the large deviations theorem. Moreover, we prove that every dynamical system satisfying the large deviations theorem of type III is an [Formula: see text]-system.
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Appleyard, R., K. Ball, F. E. Hughes, W. Kilby, S. Lassen, R. Nicholls, V. Rabett, J. Sage, M. Smith et E. Thomson. « Systematic in vivo dosimetry for quality assurance using diodes. Part 1 : Experiences and results of the implementation of entrance dose measurements ». Journal of Radiotherapy in Practice 3, no 4 (mars 2003) : 185–96. http://dx.doi.org/10.1017/s1460396903000542.

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Purpose: This paper describes our experiences of implementing systematic in vivo dosimetry at the Norfolk and Norwich Hospital and reviews the results of 2,254 entrance dose measurements made over a 17-month period.Methods and materials: Entrance dose measurements using p-type diodes were performed on all new planned patients. The calibration procedure and correction factors applied are described. A 4% tolerance was applied.Results: The results of all measurements indicated a small mean deviation from expected entrance dose of 10.77% and a standard deviation of 2.85%. 16.7% of all measurements exceeded the 4% tolerance with 9.2% exceeding a 5% level. The estimated overall errors for 578 treatments were calculated using the weighted averages of all beams. A narrower SD of 1.96% combined with only 4.8% of all treatments exceeding a 4% tolerance show that large deviations from a single field do not always translate into significant overall errors.Conclusions: Global dosimetric accuracy was within clinically acceptable limits and variations between measured and expected doses were mainly attributable to factors affecting diode reading. A number of errors in calculating deviations and the inconsistent application of the protocol suggest the need for interfacing the diode system with software control.
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NAMAKI, A., R. RAEI et G. R. JAFARI. « COMPARING TEHRAN STOCK EXCHANGE AS AN EMERGING MARKET WITH A MATURE MARKET BY RANDOM MATRIX APPROACH ». International Journal of Modern Physics C 22, no 04 (avril 2011) : 371–83. http://dx.doi.org/10.1142/s0129183111016300.

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We analyze cross-correlation between return fluctuations of stocks of an emerging market by using random matrix theory (RMT). We test the statistics of eigenvalues of cross-correlation (C) between stocks of the Tehran Price Index (TEPIX) as an emerging market and compare these with a mature market (US market). According to the "null hypothesis," a random correlation matrix constructed from mutually uncorrelated time series, the deviation from the Gaussian orthogonal ensemble of RTM is a good criterion. We find that a majority of the eigenvalues of C fall within the bulk (RMT bounds between λ+and λ-) for the eigenvalues of the random correlation matrices. Further, we find that the distribution of eigenvector components for the eigenvectors corresponding to the largest deviating eigenvalues, display systematic deviations from the RMT prediction. Analyzing the components of the deviating eigenvectors by Inverse Participation Ratio, leads us to know that the largest eigenvalue corresponds to an influence common to the whole market. Our analysis of the other deviating eigenvectors shows distinct industries, whose identities corresponds to the structure of the Iran business environment.
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Lakshminarayan, Arul, Nicholas R. Cerruti et Steven Tomsovic. « Classical diffusion and quantum level velocities : Systematic deviations from random matrix theory ». Physical Review E 60, no 4 (1 octobre 1999) : 3992–99. http://dx.doi.org/10.1103/physreve.60.3992.

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Polo, J., L. Martín et J. M. Vindel. « Correcting satellite derived DNI with systematic and seasonal deviations : Application to India ». Renewable Energy 80 (août 2015) : 238–43. http://dx.doi.org/10.1016/j.renene.2015.02.031.

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LoVerde, John, et Wayland Dong. « A proposal for systematic investigation of reproducibility deviations in Laboratory Acoustical Measurements. » Journal of the Acoustical Society of America 126, no 4 (2009) : 2171. http://dx.doi.org/10.1121/1.3248450.

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Tsutsumi, M., et A. Saito. « Identification and compensation of systematic deviations particular to 5-axis machining centers ». International Journal of Machine Tools and Manufacture 43, no 8 (juin 2003) : 771–80. http://dx.doi.org/10.1016/s0890-6955(03)00053-1.

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Rodda, Jill. « Commentary on gait deviations in patients with Dravet syndrome : A systematic review ». European Journal of Paediatric Neurology 23, no 3 (mai 2019) : 341. http://dx.doi.org/10.1016/j.ejpn.2019.05.004.

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Lin Zhou, Kathleen Vunckx et Johan Nuyts. « Multi-Pinhole SPECT Calibration : Influence of Data Noise and Systematic Orbit Deviations ». IEEE Transactions on Medical Imaging 30, no 10 (octobre 2011) : 1795–807. http://dx.doi.org/10.1109/tmi.2011.2148123.

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Kvíčalová, Magdalena, Vratislav Blechta, Krzysztof Kobylczyk, Ryszard Piekos et Jan Schraml. « Silicon-29 NMR Spectra of tert-Butyldimethylsilyl and Trimethylsilyl Derivatives of Some Non-Rigid Diols ». Collection of Czechoslovak Chemical Communications 62, no 5 (1997) : 761–68. http://dx.doi.org/10.1135/cccc19970761.

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29Si NMR spectra of trimethylsilyl (TMS) and tert-butyldimethylsilyl (TBDMS) derivatives of selected diols were measured under standardized conditions (i.e., in diluted CDCl3 solutions). Application of the recently reported correlation between the chemical shifts in TMS and TBDMS derivatives revealed considerable and systematic deviations which exceeded experimental errors and error estimates from the correlation. Two possible explanations of the deviations are considered: interaction between the two bulky substituent groups and invalidity of the reported correlation for simple hydroxy derivatives. An independent study of analogous derivatives of monohydroxy compounds has shown that the linear correlation holds but the slope and intercept are significantly different from those reported previously on the basis of a study of amino acid derivatives. The data obtained for the diol derivatives fit the new correlation very well and no indication of an interaction between the bulky TBDMS groups was noticed. However, deviations do occur in branched diol derivatives in which branching reduces accessibility of the oxygen atoms surface to associate with proton donors. The largest deviation was found when intramolecular hydrogen bond was formed.
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Kasten, Ana Paula, Bruna Nichele da Rosa, Emanuelle Francine Detogni Schmit, Matias Noll et Claudia Tarragô Candotti. « Prevalence of postural deviations in the spine in schoolchildren : a systematic review with meta-analysis ». Journal of Human Growth and Development 27, no 1 (13 avril 2017) : 99. http://dx.doi.org/10.7322/jhgd.127684.

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Objective: To estimate the prevalence of spine postural deviations in Brazilian schoolchildren. Method: Searches were conducted in databases EMBASE, LILACS, PubMed, SCOPUS, SciELO, Science Direct, and Web of Science, as well as manual searches to identify studies that evaluated the prevalence of spine postural deviations in Brazilian schoolchildren. Two independent reviewers realized the study selection, evaluated the methodological quality and the risk of bias and extracted data. The homogeneity between the studies was evaluated and the quality of evidence level using the GRADE system. Results: 29 studies were included, of which extracted the frequency of positive events to changes in cervical, thoracic and lumbar spine, as well as the frequency of scoliosis between schoolchildren. Even performing the meta-analysis separated by subgroups according to the spine region, the heterogeneity level it was up to 90%, it is not possible to perform the meta-analysis to estimate the prevalence of spine postural deviations in Brazilian schoolchildren. Conclusion: There is low strength of evidence to establish a consensus about the values of the prevalence of spine postural deviations in Brazilian schoolchildren.
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Wei, Jinde, Ying Li, Kefei Zhang, Mi Liao, Weihua Bai, Congliang Liu, Yan Liu et Xiaoming Wang. « An Evaluation of Fengyun-3C Radio Occultation Atmospheric Profiles Over 2015–2018 ». Remote Sensing 12, no 13 (1 juillet 2020) : 2116. http://dx.doi.org/10.3390/rs12132116.

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Fengyun-3C (FY-3C) is the first Chinese satellite that is capable of using the Radio Occultation (RO) technique to retrieve atmospheric profiles. This research evaluates the quality of FY-3C RO profiles including refractivity, temperature, and specific humidity by comparing with corresponding information from the European Centre for Medium-Range Weather Forecasts (ECMWF) Interim Reanalysis (ERA-Interim) data over the period of 2015–2018. The evaluation is carried out by calculating and analyzing mean systematic differences between FY-3C and ERA-Interim profiles and corresponding standard deviations over a selected spatial and temporal domain. Results show that the FY-3C RO profiles are overall with good agreements with the ERA-Interim data. Global mean refractivity systematic differences are within ±0.2% from 5 to 30 km altitude range with relative standard deviations of less than 2%. Global temperature mean systematic differences vary within ±0.2 K from a 10- to 20-km altitude range with standard deviations of less than 2 K. Global mean specific humidity differences are found to be within ±0.2 g/kg from 2 to 20 km with standard deviations of less than 1 g/kg. FY-3C profiles show visible latitudinal and altitudinal variations, while the seasonal variations are minor. Sampling errors of refractivity and temperature are also found to be larger at higher latitudinal regions due to RO events being less sampled in the polar region.
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Abraha, Iosief, Francesco Cozzolino, Massimiliano Orso, Mauro Marchesi, Antonella Germani, Guido Lombardo, Paolo Eusebi et al. « A systematic review found that deviations from intention-to-treat are common in randomized trials and systematic reviews ». Journal of Clinical Epidemiology 84 (avril 2017) : 37–46. http://dx.doi.org/10.1016/j.jclinepi.2016.11.012.

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Bonsu, Emmanuel. « A CRITICAL EVALUATION OF THE PERCEPTIONS OF ERRORS IN THE LITERATURE ON SECOND LANGUAGE ACQUISITION (SLA) RESEARCH AND HOW APPLIED LINGUISTS AND TEACHERS NEED TO RESPOND TO ERRORS OF SECOND LANGUAGE LEARNERS ». International Journal of Applied Research in Social Sciences 3, no 3 (11 juillet 2021) : 26–32. http://dx.doi.org/10.51594/ijarss.v3i3.233.

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Second language learners, in acquiring English as a second language, make errors based on their cognition of concepts. The perception of linguists and teachers about errors inform their approach to language research and pedagogies. Linguists and teachers who have negative attitudes towards errors consider them as deviations that need to be prevented at all costs, while others perceive the errors as innovation. Indeed, while deviations could be innovative and contribute immensely to the development of new varieties of languages, some deviations are clearly deficits that could influence the acquisition process leading, and language teachers need to respond to these deviations appropriately. Through a systematic review of literature, the article presents an evaluation of errors (deviations or innovation) and their pedagogical purposes for applied linguists and teachers. Keywords: Second Language, Errors, Deviations, Innovations, Pedagogical Purposes
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Marlière, Daniel Amaral Alves, Maurício Silva Demètrio, Leonardo Santos Picinini, Rodrigo Guerra De Oliveira et Henrique Duque De Miranda Chaves Netto. « Accuracy of computer-guided surgery for dental implant placement in fully edentulous patients : A systematic review ». European Journal of Dentistry 12, no 01 (janvier 2018) : 153–60. http://dx.doi.org/10.4103/ejd.ejd_249_17.

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ABSTRACTAssess clinical studies regarding accuracy between virtual planning of computer-guided surgery and actual outcomes of dental implant placements in total edentulous alveolar ridges. A PubMed search was performed to identify only clinical studies published between 2011 and 2016, searching the following combinations of keywords: “Accuracy AND Computer-Assisted Surgery AND Dental Implants.” Study designs were identified using the terms: Case Reports, Clinical study, Randomized Controlled Trial, Systematic Reviews, Meta-Analysis, humans. Level of agreement between the authors in the study selection process was substantial (k = 0.767), and the study eligibility was considered excellent (k = 0.863). Seven articles were included in this review. They describe the use of bone and muco-supported guides, demonstrating angular deviations cervically and apically ranging from (minimum and maximum means), respectively, 1.85-8.4 (°), 0.17-2.17 (mm), and 0.77-2.86 (mm). Angular deviations obtained most inaccuracy in maxila. For cervical and apical deviations, accuracy was preponderantly lower in maxilla. Despite the similar deviations measurement approaches described, clinical relevance of this study may be useful to warn the surgeon that safety margins in clinical situations.
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Dissanayake, Manjula, et Aminah Robinson Fayek. « Soft computing approach to construction performance prediction and diagnosis ». Canadian Journal of Civil Engineering 35, no 8 (août 2008) : 764–76. http://dx.doi.org/10.1139/l08-023.

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Increasing project complexity and greater levels of fast-tracking on construction projects make the need for quickly detecting and diagnosing a deviation in a construction performance measure from its planned value a challenging task. In such a rapidly changing environment, timely detection of deviations is critical so that the most effective corrective actions can be taken. This paper presents an integrated model that is capable of predicting and diagnosing construction performance deviations based on a combination of field measurements and subjective assessments of performance-related factors. The proposed system is based on the synergistic integration of the soft computing approaches of fuzzy set theory, neural networks, and genetic algorithms. A systematic methodology to elicit and represent qualitative construction performance knowledge from a group of experts is presented. The essential features of the model are described in detail and are implemented in a computer system called XCOPE (explaining construction performance).
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Hähnel, Angelika, Manfred Reiche, Oussama Moutanabbir, Horst Blumtritt, Holm Geisler, Jan Höntschel et Hans-Jürgen Engelmann. « Improving Accuracy and Precision of Strain Analysis by Energy-Filtered Nanobeam Electron Diffraction ». Microscopy and Microanalysis 18, no 1 (18 janvier 2012) : 229–40. http://dx.doi.org/10.1017/s1431927611012657.

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AbstractThis article deals with uncertainty in the analysis of strain in silicon nanoscale structures and devices using nanobeam electron diffraction (NBED). Specimen and instrument related errors and instabilities and their effects on NBED analysis are addressed using a nanopatterned ultrathin strained silicon layer directly on oxide as a model system. We demonstrate that zero-loss filtering significantly improves the NBED precision by decreasing the diffuse background in the diffraction patterns. To minimize the systematic deviations the acquired data were verified through a reliability test and then calibrated. Furthermore, the effect of strain relaxation by specimen preparation using a FIB is estimated by comparing profiles, which were acquired by analyzing slices of strained structures in a 220-nm-thick region of the sample (invasive preparation) and the entire strained nanostructures, which are embedded in a thicker region of the same sample (noninvasive preparation). Together with the random deviation, the corresponding systematic shift results in a total deviation of ∼1 × 10−3 for NBED analyses, which is employed to estimate the measurement uncertainty in the thinner sample region. In contrast, the strain in the thick sample region is not affected by the preparation; the systematic shift reduces to a minimum, which improves the total deviation by ∼50%.
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Kononov, Yuri, Evgenii Zelenskii, Olga Rybasova, Dmitrii Kostyukov et Ekaterina Bakaushina. « Estimation of 500 kV power transmission line parameters with PMU ». E3S Web of Conferences 279 (2021) : 01014. http://dx.doi.org/10.1051/e3sconf/202127901014.

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This work is devoted to the research of the real-time estimation of 500 kV power transmission lines parameters with PMU based on the solution of the optimization problem of minimizing the root-mean-square deviations of the specific line parameters or the sum of the modules of the correlation coefficients between the specific parameters and the sum of the squares of the voltages or currents measured at the ends of the line. Independent optimization variables are the correction factors of the measuring systems of currents and voltages. Based on an artificially simulated PMU dataset with specified Gaussian noise and systematic errors, it is shown that the use of correlation coefficients in the objective function is more effective than standard deviations. All 5 estimated coefficients turned out to be closer to the reference values. The results of calculations are obtained from the data of real PMUs for an operating 500 kV line with a length of 504.6 km. The deviation of the specific capacitive conductivity from the nominal value is 0.13%, compared with - 0.29% when using the sum of squares of deviations as an objective function.
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Poniatowska, Małgorzata, et Andrzej Werner. « Fitting Spatial Models of Geometric Deviations of Free-Form Surfaces Determined in Coordinate Measurements ». Metrology and Measurement Systems 17, no 4 (1 janvier 2010) : 599–610. http://dx.doi.org/10.2478/v10178-010-0049-x.

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Fitting Spatial Models of Geometric Deviations of Free-Form Surfaces Determined in Coordinate MeasurementsLocal geometric deviations of free-form surfaces are determined as normal deviations of measurement points from the nominal surface. Different sources of errors in the manufacturing process result in deviations of different character, deterministic and random. The different nature of geometric deviations may be the basis for decomposing the random and deterministic components in order to compute deterministic geometric deviations and further to introduce corrections to the processing program. Local geometric deviations constitute a spatial process. The article suggests applying the methods of spatial statistics to research on geometric deviations of free-form surfaces in order to test the existence of spatial autocorrelation. Identifying spatial correlation of measurement data proves the existence of a systematic, repetitive processing error. In such a case, the spatial modelling methods may be applied to fitting a surface regression model representing the deterministic deviations. The first step in model diagnosing is to examine the model residuals for the probability distribution and then the existence of spatial autocorrelation.
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Lopez, Carlos G., Ferenc Horkay, Matan Mussel, Ronald L. Jones et Walter Richtering. « Screening lengths and osmotic compressibility of flexible polyelectrolytes in excess salt solutions ». Soft Matter 16, no 31 (2020) : 7289–98. http://dx.doi.org/10.1039/d0sm00464b.

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Korf, Nathalie, Paul Martin Mählitz et Vera Susanne Rotter. « Round robin tests of secondary raw materials : A systematic review of performance parameters ». Reviews in Analytical Chemistry 41, no 1 (1 janvier 2022) : 98–111. http://dx.doi.org/10.1515/revac-2022-0033.

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Abstract An improved management of secondary raw materials (SRM) is a crucial contribution for a circular economy and necessitates knowledge about the composition of wastes and SRM. However, this information is scarce and has to be determined with chemical analysis (CA). CA of SRM faces challenges, which can be approached by using round robin tests (RRT) to identify deviations from the “true value” of an element/molecule content. An RRT is a testing approach, which involves multiple labs to analyze one or more samples and evaluates the lab results with regard to the goal of the RRT. This article presents a systematic literature review and investigates which purposes and which performance parameters (PP) are commonly applied in RRT of SRM. The examined literature shows that the two main purposes applied are assessment of method performance and assessment of lab performance. PP can be categorized into trueness performance parameters (TPP; assessing the deviation of a value from a reference value) and precision performance parameters (PPP; describing the variability of a data set). The main TPP identified are z score and relative deviation, the main PPP identified are standard deviation and relative standard deviation. These results offer the conclusions that RRT can be used as a bespoke method to deal with analytical effects and that the selection of PP for an RRT could be based on simplicity.
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Weir, Christopher J., Valentina Assi, Lumine Na, Stephanie C. Lewis, Gordon D. Murray, Peter Langhorne et Marian C. Brady. « Unreported Summary Statistics in Trial Publications and Risk of Bias in Stroke Rehabilitation Systematic Reviews : An International Survey of Review Authors and Examination of Practical Solutions ». Journal of Stroke Medicine 2, no 2 (30 octobre 2019) : 136–42. http://dx.doi.org/10.1177/2516608519873476.

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Objective: Continuous outcome measures are essential in rehabilitation research. Incomplete reporting of their mean and standard deviation, required for meta-analysis, potentially introduces bias and imprecision if it prevents studies being included. We aimed to determine how often systematic reviewers encounter missing mean or standard deviation values and to recommend practical statistical solutions. Design: 1. Cross-sectional survey of systematic review authors. 2. Reanalysis of Cochrane review data to evaluate how accurately statistical methods for recovering missing mean or standard deviation values estimate the true meta-analysis treatment effect. Setting: Rehabilitation intervention systematic reviews. Participants: Cochrane stroke rehabilitation review authors; stroke patients. Interventions: Reanalysis of a Cochrane review of early supported discharge services. Main measures: Hospital length of stay. Results: Survey responses covered 53 of 70 Cochrane reviews. Almost all studied continuous outcome measures, 68% encountering missing summary statistics. Various solutions were attempted but 76% of meta-analyses omitted at least one study due to missing information. In the review reanalysis ( N = 1055), a method based on the minimum and maximum performed best in recovering missing standard deviations; a method based on the median, lower and upper quartiles successfully estimated a missing mean. Conclusion: Practical statistical methods help reduce risk of bias, maximise the evidence included in rehabilitation meta-analyses and offer a clear hierarchy of solutions to handling unreported mean and standard deviation values.
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