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Letteratura scientifica selezionata sul tema "Post-processing techniques"

Autore: Grafiati

Pubblicato: 3 maggio 2025

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Articoli di riviste sul tema "Post-processing techniques"

Jiru, Filip. "Introduction to post-processing techniques". European Journal of Radiology 67, n. 2 (agosto 2008): 202–17. http://dx.doi.org/10.1016/j.ejrad.2008.03.005.

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Van Schaeybroeck, B., e S. Vannitsem. "Post-processing through linear regression". Nonlinear Processes in Geophysics 18, n. 2 (7 marzo 2011): 147–60. http://dx.doi.org/10.5194/npg-18-147-2011.

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Abstract. Various post-processing techniques are compared for both deterministic and ensemble forecasts, all based on linear regression between forecast data and observations. In order to evaluate the quality of the regression methods, three criteria are proposed, related to the effective correction of forecast error, the optimal variability of the corrected forecast and multicollinearity. The regression schemes under consideration include the ordinary least-square (OLS) method, a new time-dependent Tikhonov regularization (TDTR) method, the total least-square method, a new geometric-mean regression (GM), a recently introduced error-in-variables (EVMOS) method and, finally, a "best member" OLS method. The advantages and drawbacks of each method are clarified. These techniques are applied in the context of the 63 Lorenz system, whose model version is affected by both initial condition and model errors. For short forecast lead times, the number and choice of predictors plays an important role. Contrarily to the other techniques, GM degrades when the number of predictors increases. At intermediate lead times, linear regression is unable to provide corrections to the forecast and can sometimes degrade the performance (GM and the best member OLS with noise). At long lead times the regression schemes (EVMOS, TDTR) which yield the correct variability and the largest correlation between ensemble error and spread, should be preferred.

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Ulbin, M., e T. K. Hellen. "Post‐processing techniques for assessing element distortion errors". Engineering Computations 6, n. 1 (gennaio 1989): 35–43. http://dx.doi.org/10.1108/eb023757.

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Kaur, Amanpreet, Jagroop Singh Sidhu e Jaskarn Singh Bhullar. "Analysis of Post-processing Techniques for Compressed Images". International Journal of Applied Research on Information Technology and Computing 8, n. 3 (2017): 270. http://dx.doi.org/10.5958/0975-8089.2017.00023.9.

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Chen, Hongmei, Lanyu Wang, Jian Wang, Jiashen Li, Honghui Deng, Xu Meng e Yongsheng Yin. "Digital Post-processing Techniques for Time-interleaved ADCs". IEIE Transactions on Smart Processing & Computing 11, n. 6 (31 dicembre 2022): 462–73. http://dx.doi.org/10.5573/ieiespc.2022.11.6.462.

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Wang, Hao, e Jerry Ying Hsi Fuh. "Metal Additive Manufacturing and Its Post-Processing Techniques". Journal of Manufacturing and Materials Processing 7, n. 1 (10 febbraio 2023): 47. http://dx.doi.org/10.3390/jmmp7010047.

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Karakurt, Ilbey, e Liwei Lin. "3D printing technologies: techniques, materials, and post-processing". Current Opinion in Chemical Engineering 28 (giugno 2020): 134–43. http://dx.doi.org/10.1016/j.coche.2020.04.001.

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Tomar, Divya, e Sonali Agarwal. "A Survey on Pre-processing and Post-processing Techniques in Data Mining". International Journal of Database Theory and Application 7, n. 4 (31 agosto 2014): 99–128. http://dx.doi.org/10.14257/ijdta.2014.7.4.09.

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Nguyen, Thi Tuyet Hai, Adam Jatowt, Mickael Coustaty e Antoine Doucet. "Survey of Post-OCR Processing Approaches". ACM Computing Surveys 54, n. 6 (luglio 2021): 1–37. http://dx.doi.org/10.1145/3453476.

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Optical character recognition (OCR) is one of the most popular techniques used for converting printed documents into machine-readable ones. While OCR engines can do well with modern text, their performance is unfortunately significantly reduced on historical materials. Additionally, many texts have already been processed by various out-of-date digitisation techniques. As a consequence, digitised texts are noisy and need to be post-corrected. This article clarifies the importance of enhancing quality of OCR results by studying their effects on information retrieval and natural language processing applications. We then define the post-OCR processing problem, illustrate its typical pipeline, and review the state-of-the-art post-OCR processing approaches. Evaluation metrics, accessible datasets, language resources, and useful toolkits are also reported. Furthermore, the work identifies the current trend and outlines some research directions of this field.

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Yu, Ji Young, Piyanan Chuesiang, Gye Hwa Shin e Hyun Jin Park. "Post-Processing Techniques for the Improvement of Liposome Stability". Pharmaceutics 13, n. 7 (5 luglio 2021): 1023. http://dx.doi.org/10.3390/pharmaceutics13071023.

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Liposomes have been utilized as a drug delivery system to increase the bioavailability of drugs and to control the rate of drug release at the target site of action. However, the occurrence of self-aggregation, coalescence, flocculation and the precipitation of aqueous liposomes during formulation or storage can cause degradation of the vesicle structure, leading to the decomposition of liposomes. To increase the stability of liposomes, post-processing techniques have been applied as an additional process to liposomes after formulation to remove water and generate dry liposome particles with a higher stability and greater accessibility for drug administration in comparison with aqueous liposomes. This review covers the effect of these techniques including freeze drying, spray drying and spray freeze drying on the stability, physicochemical properties and drug encapsulation efficiency of dry liposomes. The parameters affecting the properties of liposomes during the drying process are also highlighted in this review. In addition, the impact of using a protective agent to overcome such limitations of each process is thoroughly discussed through various studies.

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Tesi sul tema "Post-processing techniques"

Lönroth, Per, e Mattias Unger. "Advanced Real-time Post-Processing using GPGPU techniques". Thesis, Linköping University, Department of Science and Technology, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-14962.

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Post-processing techniques are used to change a rendered image as a last step before presentation and include, but is not limited to, operations such as change of saturation or contrast, and also more advanced effects like depth-of-field and tone mapping.

Depth-of-field effects are created by changing the focus in an image; the parts close to the focus point are perfectly sharp while the rest of the image has a variable amount of blurriness. The effect is widely used in photography and movies as a depth cue but has in the latest years also been introduced into computer games.

Today’s graphics hardware gives new possibilities when it comes to computation capacity. Shaders and GPGPU languages can be used to do massive parallel operations on graphics hardware and are well suited for game developers.

This thesis presents the theoretical background of some of the recent and most valuable depth-of-field algorithms and describes the implementation of various solutions in the shader domain but also using GPGPU techniques. The main objective is to analyze various depth-of-field approaches and look at their visual quality and how the methods scale performance wise when using different techniques.

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Farsi, Hassan. "Advanced pre-and-post processing techniques for speech coding". Thesis, University of Surrey, 2003. http://epubs.surrey.ac.uk/844491/.

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Advances in digital technology in the last decade have motivated the development of very efficient and high quality speech compression algorithms. While in the early low bit rate coding systems, the main target was the production of intelligible speech at low bit rates, expansion of new applications such as mobile satellite systems increased the demand for reducing the transmission bandwidth and achieving higher speech quality. This resulted in the development of efficient parametric models for speech production system. These models were the basis of powerful speech compression algorithms such as CELP, MBE, MELP and WI. The performance of a speech coder not only depends on the speech production model employed but also on the accurate estimation of speech parameters. Periodicity, also known as pitch, is one of the speech parameters that greatly affect the synthesised speech quality. Thus, the subject of pitch determination has attracted much research in the area of low bit rate coding. In these studies it is assumed that for a short segment of speech, called frame, the pitch is fixed or smoothly evolving. The pitch estimation algorithms generally fail to determine irregular variations, which can occur at onset and offset speech segments. In order to overcome this problem, a novel preprocessing method, which detects irregular pitch variations and modifies the speech signal such as to improve the accuracy of the pitch estimation, is proposed. This method results in more regular speech while maintaining perceptual speech quality. The perceptual quality of the synthesised speech may also be improved using postfiltering techniques. Conventional postfiltering methods generally consider the enhancement of the whole speech spectrum. This may result in the broadening of the first formant, which leads to the increase of quantisation noise for this formant. A new postfiltering technique, which is based on factorising the linear prediction synthesis filter, is proposed. This provides more control over the formant bandwidth and attenuation of spectral speech valleys. Key words: Pitch smoothing, speech pre-processor, postfiltering.

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Goldfarb, Daniel Scott. "An Evaluation of Assignment Algorithms and Post-Processing Techniques for Travel Demand Forecast Models". Thesis, Virginia Tech, 2003. http://hdl.handle.net/10919/31631.

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The purpose of this research project was to evaluate the techniques outlined in the National Cooperative Highway Research Program Technical Report 255 Highway Traffic Data for Urbanized Area Project Planning and Design (NCHRP-255), published in 1982 by the Transportation Research Board. This evaluation was accomplished by using a regional travel demand forecast model calibrated and validated for the year 1990 and developing a highway forecast for the year 2000. The forecasted volumes along the Capital Beltway (I-495/I-95) portion located in the State of Maryland were compared to observed count data for that same year. A series of statistical measures were used to quantitatively evaluate the benefits of the techniques documented in NCHRP-255. The primary research objectives were: Â·To critically evaluate the ability of a regional travel demand forecast model to accurately forecast freeway corridor volumes by comparing link forecast volumes to the actual count data. Â·To evaluate and determine the significance of post-processing techniques as outlined in NCHRP-255. The most important lesson learned from this research is that although it was originally written in 1982, NCHRP-255 is still a very valuable resources for supplementing travel demand forecast model output. The â rawâ model output is not reliable enough to be used directly for highway design, operational analysis, nor alternative or economic evaluations. The travel demand forecast model is a tool that is just part of the forecasting process. It is not a turn-key operation, and travel demand forecasts cannot be done without the application of engineering judgment.
Master of Science

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Ni, Karl S. "Pattern recognition techniques for image and video post-processing specific application to image interpolation /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 2008. http://wwwlib.umi.com/cr/ucsd/fullcit?p3307557.

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Thesis (Ph. D.)--University of California, San Diego, 2008.
Title from first page of PDF file (viewed July 15, 2008). Available via ProQuest Digital Dissertations. Vita. Includes bibliographical references (p. 142-151).

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McLeish, Kate. "Combining data acquisition and post-processing techniques for magnetic resonance imaging of moving objects". Thesis, King's College London (University of London), 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406105.

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Weis, Christian [Verfasser], e Ben [Gutachter] Fabry. "Monitoring of cell dynamics - Imaging techniques and post-processing / Christian Weis ; Gutachter: Ben Fabry". Erlangen : Friedrich-Alexander-Universität Erlangen-Nürnberg (FAU), 2016. http://d-nb.info/1123284385/34.

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Hendriks, Lukas Anton. "Image processing techniques for sector scan sonar". Thesis, Stellenbosch : University of Stellenbosch, 2009. http://hdl.handle.net/10019.1/2487.

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Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2009.
ENGLISH ABSTRACT: Sonars are used extensively for underwater sensing and recent advances in forward-looking imaging sonar have made this type of sonar an appropriate choice for use on Autonomous Underwater Vehicles. The images received from these sonar do however, tend to be noisy and when used in shallow water contain strong bottom reflections that obscure returns from actual targets. The focus of this work was the investigation and development of post-processing techniques to enable the successful use of the sonar images for automated navigation. The use of standard image processing techniques for noise reduction and background estimation, were evaluated on sonar images with varying amounts of noise, as well as on a set of images taken from an AUV in a harbour. The use of multiple background removal and noise reduction techniques on a single image was also investigated. To this end a performance measure was developed, based on the dynamic range found in the image and the uniformity of returned targets. This provided a means to quantitatively compare sets of post-processing techniques and identify the “optimal” processing. The resultant images showed great improvement in the visibility of target areas and the proposed techniques can significantly improve the chances of correct target extraction.
AFRIKAANSE OPSOMMING: Sonars word algemeen gebruik as onderwater sensors. Onlangse ontwikkelings in vooruit-kykende sonars, maak hierdie tipe sonar ’n goeie keuse vir die gebruik op ’n Outomatiese Onderwater Voertuig. Die beelde wat ontvang word vanaf hierdie sonar neig om egter raserig te wees, en wanneer dit in vlak water gebruik word toon dit sterk bodemrefleksies, wat die weerkaatsings van regte teikens verduister. Die fokus van die werk was die ondersoek en ontwikkeling van naverwerkings tegnieke, wat die sonar beelde bruikbaar maak vir outomatiese navigasie. Die gebruik van standaard beeldverwerkingstegnieke vir ruis-onderdrukking en agtergrond beraming, is geëvalueer aan die hand van sonar beelde met verskillende hoeveelhede ruis, asook aan die hand van ’n stel beelde wat in ’n hawe geneem is. Verdere ondersoek is ingestel na die gebruik van meer as een agtergrond beramings en ruis onderdrukking tegniek op ’n enkele beeld. Hierdie het gelei tot die ontwikkeling van ’n maatstaf vir werkverrigting van toegepaste tegnieke. Hierdie maatstaf gee ’n kwantitatiewe waardering van die verbetering op die oorspronklike beeld, en is gebaseer op die verbetering in dinamiese bereik in die beeld en die uniformiteit van die teiken se weerkaatsing. Hierdie maatstaf is gebruik vir die vergelyking van verskeie tegnieke, en identifisering van die “optimale” verwerking. Die verwerkte beelde het ’n groot verbetering getoon in die sigbaarheid van teikens, en die voorgestelde tegnieke kan ’n betekenisvolle bedrae lewer tot die suksesvolle identifisering van obstruksies.

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Paolani, Giulia. "Brain perfusion imaging techniques". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2019.

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In questo lavoro si sono analizzate due diverse tecniche di imaging di perfusione implementate in Risonanza Magnetica e Tomografia Assiale Computerizzata (TAC). La prima analisi proposta riguarda la tecnica di Arterial Spin Labeling che permette di ottenere informazioni di perfusione senza la somministrazione di un mezzo di contrasto. In questo lavoro si è sviluppata e testata una pipeline completa, attraverso lo sviluppo sia di un protocollo di acquisizione che di post-processing. In particolare, sono stati definiti parametri di acquisizione standard, che permettono di ottenere una buona qualità dei dati, successivamente elaborati attraverso un protocollo di post processing che, a partire dall'acquisizione di un esperimento di ASL, permette il calcolo di una mappa quantitativa di cerebral blood flow (CBF). Nel corso del lavoro, si è notata una asimmetria nella valutazione della perfusione, non giustificata dai dati e probabilmente dovuta ad una configurazione hardware non ottimale. Risolta questa difficoltà tecnica, la pipeline sviluppata sarà utilizzata come standard per l’acquisizione e il post-processing di dati ASL. La seconda analisi riguarda dati acquisiti attraverso esperimenti di perfusione TAC. Si è presa in considerazione la sua applicazione a casi di infarti cerebrali in cui le tecniche di trombectomia sono risultate inefficaci. L'obiettivo di questo lavoro è stata la definizione di una pipeline che permetta il calcolo autonomo delle mappe di perfusione e la standardizzazione della trattazione dei dati. In particolare, la pipeline permette l’analisi di dati di perfusione attraverso l’utilizzo di soli software open-source, contrapponendosi alla metodologia operativa comunemente utilizzata in clinica e rendendo le analisi riproducibili. Il lavoro proposto è inserito in un progetto più ampio, che include future analisi longitudinali con coorti di pazienti più ampie per definire e validare parametri predittivi degli outcome dei pazienti.

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Georgantzoglou, Antonios. "Development of near real-time image processing techniques for cell detection, microbeam targeting and tracking post-irradiation". Thesis, University of Cambridge, 2016. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.709522.

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Rao, Anita. "High resolution magnetic resonance angiography (mra) of the renal vasculature : development of improved acquisition and post- processing techniques /". The Ohio State University, 1996. http://rave.ohiolink.edu/etdc/view?acc_num=osu1487940308432037.

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Libri sul tema "Post-processing techniques"

Alam, Zafar, Faiz Iqbal e Dilshad Ahmad Khan. Post-processing Techniques for Additive Manufacturing. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003288619.

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Angela, Geary, a cura di. Post-digital printmaking: CNC, traditional and hybrid techniques. London: A. & C. Black, 2012.

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Max, Ferguson. Max Ferguson's digital darkroom masterclass: An illustrated guide to photographic post production. Oxford: Focal Press, 2000.

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J, Mitchell William. The reconfigured eye: Visual truth in the post-photographic era. Cambridge, Mass: MIT Press, 1992.

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Castañer, Manuel Sierra, e Lars J. Foged. Post-Processing Techniques in Antenna Measurement. SciTech Publishing, Incorporated, 2019.

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Sierra Castaner, Manuel, e Lars J. Foged, a cura di. Post-processing Techniques in Antenna Measurement. Institution of Engineering and Technology, 2019. http://dx.doi.org/10.1049/sbew529e.

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Post-processing techniques for integrated MEMS. Boston: Artech House, 2006.

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Sedky, Sherif. Post-Processing Techniques for Integrated MEMS. Artech House Publishers, 2005.

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Post- Processing Techniques for Additive Manufacturing. CRC Press LLC, 2023.

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Post-Processing Techniques in Antenna Measurement. SciTech Publishing, Incorporated, 2019.

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Capitoli di libri sul tema "Post-processing techniques"

Wang, Hao, Yan Jin Lee, Yuchao Bai e Jiong Zhang. "Future of Post-Processing". In Post-Processing Techniques for Metal-Based Additive Manufacturing, 257–72. New York: CRC Press, 2023. http://dx.doi.org/10.1201/9781003272601-11.

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Iqbal, Faiz, Zafar Alam e Dilshad Ahmad Khan. "Additive manufacturing and post-processing". In Post-processing Techniques for Additive Manufacturing, 1–19. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003288619-1.

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Singh, Jasvinder, Ravinder Pal Singh e Pulak Mohan Pandey. "Additive Manufacturing Techniques". In Handbook of Post-Processing in Additive Manufacturing, 1–34. New York: CRC Press, 2023. http://dx.doi.org/10.1201/9781003276111-1.

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Carey, G. F., e R. J. MacKinnon. "Superconvergence and Finite Element Post Processing". In Numerical Techniques for Engineering Analysis and Design, 705–13. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3653-9_77.

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Wang, Hao, Yan Jin Lee, Yuchao Bai e Jiong Zhang. "Theoretical Modeling Considerations for Post-Processing". In Post-Processing Techniques for Metal-Based Additive Manufacturing, 165–201. New York: CRC Press, 2023. http://dx.doi.org/10.1201/9781003272601-8.

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Youssef, Helmi, Hassan El-Hofy e Mahmoud Ahmed. "Post-Processing Techniques in Additive Manufacturing Processes". In Fundamentals of Additive Manufacturing, 226–55. Boca Raton: CRC Press, 2024. http://dx.doi.org/10.1201/9781003451440-8.

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Mahmood, Muhammad Arif, Abid Ullah, Mussadiq Shah, Asif Ur Rehman, Metin Uymaz Salamci e Marwan Khraisheh. "Thermal Post-Processing Techniques for Additive Manufacturing". In Handbook of Post-Processing in Additive Manufacturing, 87–110. New York: CRC Press, 2023. http://dx.doi.org/10.1201/9781003276111-5.

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Valerga, Ana Pilar, Mir Irfan Ul Haq e Severo R. Fernandez-Vidal. "Chemical post-processing for fused deposition modelling". In Post-processing Techniques for Additive Manufacturing, 129–53. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003288619-6.

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Vasuthaven, Arvind Ganesh a/l, Zarirah Karrim Wani, Ahmad Baharuddin Abdullah e Zuhailawati Hussain. "Post welding cold forging and effect on mechanical properties of low-carbon mild steel wire arc additive manufacturing". In Post-processing Techniques for Additive Manufacturing, 155–73. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003288619-7.

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Gavcar, Beyza, e Binnur Sagbas. "Mechanical post-processing techniques for metal additive manufacturing". In Post-processing Techniques for Additive Manufacturing, 21–44. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003288619-2.

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Atti di convegni sul tema "Post-processing techniques"

M, Suganthy, SurivaK, Prabhu V, V. Senthulkumar, PrabhukumarS e Vijayakumar Peroumal. "Bacterial Contamination Monitoringand Prevention in Chambers Using Post Processing Techniques". In 2024 International Conference on Brain Computer Interface & Healthcare Technologies (iCon-BCIHT), 89–94. IEEE, 2024. https://doi.org/10.1109/icon-bciht63907.2024.10882306.

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Ren, Wenze, Kuo-Hsuan Hung, Rong Chao, YouJin Li, Hsin-Min Wang e Yu Tsao. "Robust Audio-Visual Speech Enhancement: Correcting Misassignments in Complex Environments With Advanced Post-Processing". In 2024 27th Conference of the Oriental COCOSDA International Committee for the Co-ordination and Standardisation of Speech Databases and Assessment Techniques (O-COCOSDA), 1–6. IEEE, 2024. https://doi.org/10.1109/o-cocosda64382.2024.10800033.

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Siegenthaler, Stefan, Marco Canavero e Axel Murk. "Post-processing techniques for radiometric images". In IGARSS 2012 - 2012 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2012. http://dx.doi.org/10.1109/igarss.2012.6351031.

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Ramakrishnan, Vyass, Karthik Shetty, Kumar G. Pawan e Chandra Sekhar Seelamantula. "Efficient post-processing techniques for speech enhancement". In 2011 National Conference on Communications (NCC). IEEE, 2011. http://dx.doi.org/10.1109/ncc.2011.5734780.

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Jian Hua Liu, Yong Sun, Zhi Chen Kang, Xin Hua Tian, Xin Li, Qing Hai Yuan e Yan Zhang. "Post-processing techniques for aortic computed tomography angiography". In 2011 International Conference on Computer Science and Network Technology (ICCSNT). IEEE, 2011. http://dx.doi.org/10.1109/iccsnt.2011.6182171.

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Debes, John H., Laurent Pueyo, Marshall D. Perrin, Élodie Choquet e Bin Ren. "Post-processing of the HST STIS coronagraphic observations". In Techniques and Instrumentation for Detection of Exoplanets VIII, a cura di Stuart Shaklan. SPIE, 2017. http://dx.doi.org/10.1117/12.2274163.

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Feygina, Anastasia, Dmitry I. Ignatov e Ilya Makarov. "Realistic post-processing of rendered 3D scenes". In SIGGRAPH '18: Special Interest Group on Computer Graphics and Interactive Techniques Conference. New York, NY, USA: ACM, 2018. http://dx.doi.org/10.1145/3230744.3230764.

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Dvorak, David, Jeremiah Neubert, William Semke, Jesse Sorum, Kyle Andreson e Richard Schultz. "Optimizing UAS Multispectral Data Collection and Post Processing Techniques". In AIAA Infotech@Aerospace Conference. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2009. http://dx.doi.org/10.2514/6.2009-1979.

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Mohapatra, B. B., Vishal Mahajan e V. A. Abid Hussain. "Post processing techniques for inverse synthetic aperture radar imaging". In 2016 IEEE International Conference on Computational Intelligence and Computing Research (ICCIC). IEEE, 2016. http://dx.doi.org/10.1109/iccic.2016.7919645.

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Duque, Earl, Steve Legensky, Christopher Stone e Russell Carter. "Post-Processing Techniques for Large-Scale Unsteady CFD Datasets". In 45th AIAA Aerospace Sciences Meeting and Exhibit. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2007. http://dx.doi.org/10.2514/6.2007-972.

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Rapporti di organizzazioni sul tema "Post-processing techniques"

Peeta, Srinivas, Amit Kumar e Sushant Sharma. Post-Processing Techniques to Enhance Reliability of Assignment Algorithm Based Performance Measures. Purdue University, 2011. http://dx.doi.org/10.5703/1288284314643.

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Ovalle, Samuel, E. Viamontes e Tony Thomas. Optimization of DLP 3D Printed Ceramic Parts. Florida International University, ottobre 2021. http://dx.doi.org/10.25148/mmeurs.009776.

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Abstract (sommario):

Digital Light Processing (DLP) 3D printing allows for the creation of parts with advanced engineering materials and geometries difficult to produce through conventional manufacturing techniques. Photosensitive resin monomers are activated with a UV-producing LCD screen to polymerize, layer by layer, forming the desired part. With the right mixture of photosensitive resin and advanced engineering powder material, useful engineering-grade parts can be produced. The Bison 1000 is a research-grade DLP printer that permits the user to change many parameters, in order to discover an optimal method for producing 3D parts of any material of interest. In this presentation, the process parameter optimization and their influence on the 3D printed parts through DLP technique will be discussed. The presentation is focused on developing 3D printable slurry, printing of complex ceramic lattice structures, as well as post heat treatment of these DLP-produced parts.

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Cook, Samantha, Marissa Torres, Nathan Lamie, Lee Perren, Scott Slone e Bonnie Jones. Automated ground-penetrating-radar post-processing software in R programming. Engineer Research and Development Center (U.S.), settembre 2022. http://dx.doi.org/10.21079/11681/45621.

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Ground-penetrating radar (GPR) is a nondestructive geophysical technique used to create images of the subsurface. A major limitation of GPR is that a subject matter expert (SME) needs to post-process and interpret the data, limiting the technique’s use. Post-processing is time-intensive and, for detailed processing, requires proprietary software. The goal of this study is to develop automated GPR post-processing software, compatible with Geophysical Survey Systems, Inc. (GSSI) data, in open-source R programming. This would eliminate the need for an SME to process GPR data, remove proprietary software dependencies, and render GPR more accessible. This study collected GPR profiles by using a GSSI SIR4000 control unit, a 100 MHz antenna, and a Trimble GPS. A standardized method for post-processing data was then established, which includes static data removal, time-zero correction, distance normalization, data filtering, and stacking. These steps were scripted and automated in R programming, excluding data filtering, which was used from an existing package, RGPR. The study compared profiles processed using GSSI software to profiles processed using the R script developed here to ensure comparable functionality and output. While an SME is currently still necessary for interpretations, this script eliminates the need for one to post-process GSSI GPR data.

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Tanny, Josef, Gabriel Katul, Shabtai Cohen e Meir Teitel. Micrometeorological methods for inferring whole canopy evapotranspiration in large agricultural structures: measurements and modeling. United States Department of Agriculture, ottobre 2015. http://dx.doi.org/10.32747/2015.7594402.bard.

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Original objectives and revisions The original objectives as stated in the approved proposal were: (1) To establish guidelines for the use of micrometeorological techniques as accurate, reliable and low-cost tools for continuous monitoring of whole canopy ET of common crops grown in large agricultural structures. (2) To adapt existing methods for protected cultivation environments. (3) To combine previously derived theoretical models of air flow and scalar fluxes in large agricultural structures (an outcome of our previous BARD project) with ET data derived from application of turbulent transport techniques for different crops and structure types. All the objectives have been successfully addressed. The study was focused on both screenhouses and naturally ventilated greenhouses, and all proposed methods were examined. Background to the topic Our previous BARD project established that the eddy covariance (EC) technique is suitable for whole canopy evapotranspiration measurements in large agricultural screenhouses. Nevertheless, the eddy covariance technique remains difficult to apply in the farm due to costs, operational complexity, and post-processing of data – thereby inviting alternative techniques to be developed. The subject of this project was: 1) the evaluation of four turbulent transport (TT) techniques, namely, Surface Renewal (SR), Flux-Variance (FV), Half-order Time Derivative (HTD) and Bowen Ratio (BR), whose instrumentation needs and operational demands are not as elaborate as the EC, to estimate evapotranspiration within large agricultural structures; and 2) the development of mathematical models able to predict water savings and account for the external environmental conditions, physiological properties of the plant, and structure properties as well as to evaluate the necessary micrometeorological conditions for utilizing the above turbulent transfer methods in such protected environments. Major conclusions and achievements The major conclusions are: (i) the SR and FV techniques were suitable for reliable estimates of ET in shading and insect-proof screenhouses; (ii) The BR technique was reliable in shading screenhouses; (iii) HTD provided reasonable results in the shading and insect proof screenhouses; (iv) Quality control analysis of the EC method showed that conditions in the shading and insect proof screenhouses were reasonable for flux measurements. However, in the plastic covered greenhouse energy balance closure was poor. Therefore, the alternative methods could not be analyzed in the greenhouse; (v) A multi-layered flux footprint model was developed for a ‘generic’ crop canopy situated within a protected environment such as a large screenhouse. The new model accounts for the vertically distributed sources and sinks within the canopy volume as well as for modifications introduced by the screen on the flow field and microenvironment. The effect of the screen on fetch as a function of its relative height above the canopy is then studied for the first time and compared to the case where the screen is absent. The model calculations agreed with field experiments based on EC measurements from two screenhouse experiments. Implications, both scientific and agricultural The study established for the first time, both experimentally and theoretically, the use of four simple TT techniques for ET estimates within large agricultural screenhouses. Such measurements, along with reliable theoretical models, will enable the future development of lowcost ET monitoring system which will be attainable for day-to-day use by growers in improving irrigation management.

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Bauer, Andrew, Jennifer Abras e Nathan Hariharan. In situ and post-processing volume rendering with with Cinema. Engineer Research and Development Center (U.S.), maggio 2021. http://dx.doi.org/10.21079/11681/40502.

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We present a new batch volume rendering technique which alleviates the time and expertise needed by the domain scientist in order to produce quality volume rendered results. This process can be done both in situ and as a post-processing step. The advantage of performing this as an in situ process is that the user is not required to have a priori knowledge of the exact physics and how best to create a transfer function to volume render that physics during the in situ run. For the post-processing use case, the user has the ability to easily examine a wide variety of transfer functions without the tedious work of manually generating each one.

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Stern, David B., e Gadi Schuster. Manipulation of Gene Expression in the Chloroplast: Control of mRNA Stability and Transcription Termination. United States Department of Agriculture, dicembre 1993. http://dx.doi.org/10.32747/1993.7568750.bard.

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Chloroplasts are the site of photosynthesis and of other essential biosynthetic activities in plant cells. Chloroplasts are semi-autonomous organelles, since they contain their own genomes and protein biosynthetic machinery, but depend on the coordinate expression of nuclear genes to assemble macromolecular complexes. The bioeingineering of plants requires manipulation of chloroplast gene expression, and thus a knowledge of the molecular mechanisms that modulate mRNA and protein production. In this proposal the heterotrophic green alga Chlamydomonas reinhardtii has been used as a model system to understand the control and interrelationships between transcription termination, mRNA 3' end processing and mRNA stability in chloroplasts. Chlamydomonas is a unique and ideal system in which to address these issues, because the chloroplast can be easily manipulated by genetic transformation techniques. This research uncovered new and important information on chloroplast mRNA 3' end formation and mRNA stability. In particular, the 3' untranslated regions of chloroplast mRNAs were shown not to be efficient transcription terminators. The endonucleolytic site in the 3' untranslated region was characterized by site directed mutagensis and the role of several 3' untranslated regions in modulating RNA stability and translation has been studied. This information will allow us to experimentally manipulate the expression of chloroplast genes in vivo by post-transcriptional mechanisms, and should be widely applicable to other higher plant systems.

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Atherosclerosis Biomarkers by Computed Tomography Angiography (CTA). Chair Andrew Buckler, Luca Saba e Uwe Joseph Schoepf. Radiological Society of North America (RSNA) / Quantitative Imaging Biomarkers Alliance (QIBA), marzo 2023. http://dx.doi.org/10.1148/qiba/20230328.

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The clinical application of Computed Tomography Angiography (CTA) is widely available as a technique to optimize the therapeutic approach to treating vascular disease. Evaluation of atherosclerotic arterial plaque characteristics is currently based on qualitative biomarkers. However, the reproducibility of such findings has historically been limited even among experts (1). Quantitative imaging biomarkers have been shown to have additive value above traditional qualitative imaging metrics and clinical risk scores regarding patient outcomes (2). However, many definitions and cut-offs are present in the current literature; therefore, standardization of quantitative evaluation of CTA datasets is needed before becoming a valuable tool in daily clinical practice. To establish these biomarkers in clinical practice, techniques are required to standardize quantitative imaging across different manufacturers with cross-calibration. Moreover, the post-processing of atherosclerotic plaque segmentation needs to be optimized and standardized. The goal of a Quantitative Imaging Biomarker Alliance (QIBA) Profile is to provide an implementation guide to generate a biomarker with an effective level of performance, mostly by reducing variability and bias in the measurement. The performance claims represent expert consensus and will be empirically demonstrated at a subsequent stage. Users of this Profile are encouraged to refer to the following site to understand the document’s context: http://qibawiki.rsna.org/index.php/QIBA_Profile_Stages. All statistical performance assessments are stated in carefully considered metrics and according to strict definitions as given in (3-8), which also includes detailed, peer-reviewed rationale on the importance of adhering to such standards. The expected performance is expressed as Claims (Section 1.2). To achieve those claims, Actors (Scanners, Reconstruction Software, Image Analysis Tools, Imaging Physicians, Physicists, and Technologists) must meet the Checklist Requirements (Section 3) covering Subject Handling, Image Data Acquisition, Image Data Reconstruction, Image QA, and Image Analysis. This Profile is at the Clinically Feasible stage (qibawiki.rsna.org/index.php/QIBA_Profile_Stages) which indicate that multiple sites have performed the Profile and found it to be practical and expect it to achieve the claimed performance. QIBA Profiles for other CT, MRI, PET, and Ultrasound biomarkers can be found at qibawiki.rsna.org

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Saba, Luca, e Uwe Joseph Schoepf. Atherosclerosis Biomarkers by Computed Tomography Angiography (CTA) - Maintenance version June 2024. Chair Andrew Buckler. Radiological Society of North America (RSNA) / Quantitative Imaging Biomarkers Alliance (QIBA), giugno 2024. http://dx.doi.org/10.1148/qiba/202406.

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Abstract (sommario):

The clinical application of Computed Tomography Angiography (CTA) is widely available as a technique to optimize the therapeutic approach to treating vascular disease. Evaluation of atherosclerotic arterial plaque characteristics is currently based on qualitative biomarkers. However, the reproducibility of such findings has historically been limited even among experts. Quantitative imaging biomarkers have been shown to have additive value above traditional qualitative imaging metrics and clinical risk scores regarding patient outcomes. However, many definitions and cut-offs are present in the current literature; therefore, standardization of quantitative evaluation of CTA datasets is needed before becoming a valuable tool in daily clinical practice. To establish these biomarkers in clinical practice, techniques are required to standardize quantitative imaging across different manufacturers with cross-calibration. Moreover, the post-processing of atherosclerotic plaque segmentation needs to be optimized and standardized. The goal of a Quantitative Imaging Biomarker Alliance (QIBA) Profile is to provide an implementation guide to generate a biomarker with an effective level of performance, mostly by reducing variability and bias in the measurement. The performance claims represent expert consensus and will be empirically demonstrated at a subsequent stage. Users of this Profile are encouraged to refer to the following site to understand the document’s context: http://qibawiki.rsna.org/index.php/QIBA_Profile_Stages. All statistical performance assessments are stated in carefully considered metrics and according to strict definitions as given in (3-8), which also includes detailed, peer-reviewed rationale on the importance of adhering to such standards. The expected performance is expressed as Claims (Section 1.2). To achieve those claims, Actors (Scanners, Reconstruction Software, Image Analysis Tools, Imaging Physicians, Physicists, and Technologists) must meet the Checklist Requirements (Section 3) covering Subject Handling, Image Data Acquisition, Image Data Reconstruction, Image QA, and Image Analysis. This Profile is at the Clinically Feasible stage (qibawiki.rsna.org/index.php/QIBA_Profile_Stages) which indicate that multiple sites have performed the Profile and found it to be practical and expect it to achieve the claimed performance. QIBA Profiles for other CT, MRI, PET, and Ultrasound biomarkers can be found at qibawiki.rsna.org.

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Groeneveld. L51690 Evaluation of Modern X-70 HFER Line Pipe. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), maggio 1992. http://dx.doi.org/10.55274/r0010316.

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In recent years, several pipe mills have produced heavy-wall, large diameter pipe from plates of microalloyed steels that were controlled-rolled to develop properties to meet the API 5LX Grade 70 or Grade 80 requirements and that were electric resistance welded (ERW) using advanced techniques. The use of advanced electric seam-welding practices on the steels produced using advanced steel making and processing methods offers the possibility of obtaining high strength line pipe at a lower cost than pipes produced from similar steels but with double submerged arc seam welds. The present study was undertaken to evaluate the properties of the pipe body and the ERW seam-weld region of a recently produced heavy-wall X70 line pipe. This report describes the evaluation of that pipe. The mechanical properties of the weld zone from this pipe were evaluated and reported under Task 18-89. Those data are included in this report. A high-frequency electric resistance welded (HFERW) X70 line pipe was evaluated to assess the strength properties, fracture behavior, thermal stability, and susceptibility to environmentally induced degradation that may affect its behavior in gas transmission service. A 20-inch-(508 mm)-diameter by 0.500-inch-(12.7 mm)-wall high-frequency, electric-resistance-welded (HFERW) X70 line pipe was evaluated to assess the strength properties, fracture behavior, thermal stability, and susceptibility to environmentally induced degradation that may affect its behavior in gas transmission service. The steel from which the pipe was produced was processed using advanced steel-making practices that resulted in a low sulfur content and was microalloyed with Cb, V, and Ti. The steel was controlled rolled with 75 percent of the rolling reduction being accomplished at temperatures below 1418 F (770 C); the finishing temperature was 1328 F (720 C) and the steel was hot coiled after finishing. The seam weld was produced by high frequency electric resistance welding and the seam weld region was post-weld normalized.

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KHAIRALLAH, Sara, e EL HARROUDI Tijani. Delayed coloanal anastomosis technique in the management of low-lying rectal cancer: systematic review and meta-analysis. INPLASY - International Platform of Registered Systematic Review and Meta-analysis Protocols, febbraio 2022. http://dx.doi.org/10.37766/inplasy2022.2.0002.

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Review question / Objective: Is there a difference in terms of post-operative events between delayed and immediate coloanal anastomoses in the management of rectum carcinoma? Condition being studied: Rectal carcinoma. Eligibility criteria: We defined the lower rectum as any rectal tumor located within 6cm of the anal margin or within 2cm of the upper edge of the sphincter ring.- All scientific articles published or not published between 01/1985 and 09/2021 that aim to demonstrate the postoperative, oncological and functional results of ACAD in the curative treatment of adenocarcinoma of the lower rectum or rectal cancer including the lower rectum.- Scientific articles that discuss case series treated with ACAD in different benign or malignant pathologies, but where patient data and results of this procedure are well individualized in patients operated on rectal adenocarcinoma. - Abstracts of conference sessions, theses or unpublished articles (grey literature) with complete data, allowing their extraction and processing in our review.Translated with http://www.DeepL.com/Translator (free version).

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