Relevant bibliographies by topics / Processus d' acquisition

Contents

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

Academic literature on the topic 'Processus d' acquisition'

Author: Grafiati
Published: 4 June 2021
Last updated: 5 February 2022

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Journal articles on the topic "Processus d' acquisition"

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Karas, I., and R. Gálik. "Contact and non-contact thermometry in the milk acquisition process." Czech Journal of Animal Science 49, No. 1 (December 11, 2011): 1–7. http://dx.doi.org/10.17221/4264-cjas.

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Temperatures of the northern wall, ceiling and floor of a 2 &times; 12 milking house as well as of a waiting area in front of the milking house were measured for 24 hours a&nbsp;day in the winter season with an average external daily temperature of &ndash;8.6&deg;C. The influence of low external temperatures on the temperatures of cows&rsquo; mammary glands was measured with a&nbsp;non-contact thermometer RAYNGER ST 6 equipped with laser. The analysis showed that the low external temperatures and insufficiently warmed external walls [average 24-hour temperatures: (t<sub>st</sub>&nbsp;=&nbsp;+1.32&deg;C), ceiling (t<sub>s</sub> = +2.65&deg;C), floor (t<sub>p</sub> = +3.29&deg;C)] as well as the waiting area in front of the milking house (t<sub>d</sub>&nbsp;= +1.9&deg;C) produced unsuitable temperature conditions despite of the use of heaters in the milking house, resulting in the undercooling of mammary glands and the traumatising of dairy cows. The temperatures of mammary glands of tested dairy cows were evaluated by a multifactor analysis of variance. The time and place of measuring were statistically significant on the significance level 0.05. The F -test value for the factor of time was 12.342, with probability 0.0007. The F -test value for the place of temperature measuring was 1061.979, probability 0.0000. Among the equations of curves of the dependences of teat end temperature on the milking time, the closest seemed to be the logarithmic function with determination index R<sup>2</sup> = 0.7404. &nbsp;
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Solon, Megan, Bret Linford, and Kimberly L. Geeslin. "Acquisition of sociophonetic variation." Revista Española de Lingüística Aplicada/Spanish Journal of Applied Linguistics 31, no. 1 (August 27, 2018): 309–44. http://dx.doi.org/10.1075/resla.16028.sol.

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Abstract This study investigates the acquisition of nativelike variation in the production of Spanish /d/ by English-speaking learners. Specifically, we examine the production of /d/ in word-internal intervocalic position in the speech of 13 highly advanced nonnative speakers (NNSs) and 13 native speakers (NSs) of Spanish in digitally-recorded sociolinguistic interviews. The analysis includes a discrete categorization of /d/ realization based on spectrographic examination (stop vs. spirant vs. deleted) and a continuous intensity difference measure. Tokens were coded for grammatical category, surrounding segments, stress, number of syllables, and lexical frequency. Results indicate that both NNSs and NSs exhibit /d/ spirantization and deletion, but these two processes are affected by different factors both between and across groups: NNS deletion patterns are predicted most significantly by lexical frequency, whereas degree of spirantization is influenced by articulatory/contextual factors of phonetic context and stress. NS patterns for both processes are influenced by most factors in a similar manner.
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Reychav, Iris, and Miguel Ignacio Aguirre-Urreta. "Adoption of the Internet for knowledge acquisition in R&D processes." Behaviour & Information Technology 33, no. 5 (March 12, 2013): 452–69. http://dx.doi.org/10.1080/0144929x.2013.765035.

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Marfurt, Kurt J., Ronald M. Scheet, John A. Sharp, and Mark G. Harper. "Suppression of the acquisition footprint for seismic sequence attribute mapping." GEOPHYSICS 63, no. 3 (May 1998): 1024–35. http://dx.doi.org/10.1190/1.1444380.

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Seismic coherency has proven to be very effective in delineating geologic faults as well as considerably more subtle stratigraphic features, including channels, canyons, slumps, levees, glacial gouges, dewatering patterns and pinnacle reefs. Unfortunately, seismic coherency estimates, which quantitatively measure the similarity or dissimilarity of adjacent traces in 3-D, are particularly sensitive to coherent noise that passes through the acquisition and processing flow. They are also sensitive to dissimilarities in fold, offset, and azimuth distribution introduced through the 3-D acquisition and binning processes. Edge enhancement algorithms further exacerbate these linear artifacts. We define the acquisition footprint to be any pattern of noise that is highly correlated to the geometric distribution of sources and receivers on the earth’s surface. While the strong acquisition footprints such as those caused by normal moveout (NMO) stretch on vintage single‐fold data have been largely ameliorated by modern 2-D multifold recording, we see acquisition 3-D footprint in the low‐fold shallow section and throughout the entire section when recording sparse 3-D land surveys that often result in only six- to sevenfold data. One may partially suppress the acquisition footprint on the seismic coherency time or depth slices using conventional 2-D image processing. Unfortunately, such filtering is inappropriate for dip/azimuth maps, cluster analysis maps, and other maps that may not be continuous real variables or with maps that have cyclic values, such as the wavelet phase. We show that simple 3-D true‐amplitude dip filtering of the input 3-D (t, x, y) time- or depth‐migrated seismic data volume can be quite effective in minimizing the detrimental effect of the acquisition footprint on conventional 3-D seismic attributes for both marine and land data acquisition geometries. However, 3-D dip filtering of migrated data will often eliminate the fault‐plane reflections necessary for sharp coherency images. We therefore recommend that, whenever possible, suppression of acquisition footprint be performed before 3-D migration on the stacked data volume, where sharp fault truncations in depth are represented by smoothly varying diffractions in time.
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Dobson, Katherine J., Sophia B. Coban, Samuel A. McDonald, Joanna N. Walsh, Robert C. Atwood, and Philip J. Withers. "4-D imaging of sub-second dynamics in pore-scale processes using real-time synchrotron X-ray tomography." Solid Earth 7, no. 4 (July 15, 2016): 1059–73. http://dx.doi.org/10.5194/se-7-1059-2016.

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Abstract. A variable volume flow cell has been integrated with state-of-the-art ultra-high-speed synchrotron X-ray tomography imaging. The combination allows the first real-time (sub-second) capture of dynamic pore (micron)-scale fluid transport processes in 4-D (3-D + time). With 3-D data volumes acquired at up to 20 Hz, we perform in situ experiments that capture high-frequency pore-scale dynamics in 5–25 mm diameter samples with voxel (3-D equivalent of a pixel) resolutions of 2.5 to 3.8 µm. The data are free from motion artefacts and can be spatially registered or collected in the same orientation, making them suitable for detailed quantitative analysis of the dynamic fluid distribution pathways and processes. The methods presented here are capable of capturing a wide range of high-frequency nonequilibrium pore-scale processes including wetting, dilution, mixing, and reaction phenomena, without sacrificing significant spatial resolution. As well as fast streaming (continuous acquisition) at 20 Hz, they also allow larger-scale and longer-term experimental runs to be sampled intermittently at lower frequency (time-lapse imaging), benefiting from fast image acquisition rates to prevent motion blur in highly dynamic systems. This marks a major technical breakthrough for quantification of high-frequency pore-scale processes: processes that are critical for developing and validating more accurate multiscale flow models through spatially and temporally heterogeneous pore networks.
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Wang, Bing, and Xiao Li Wang. "Simulation of A/D Conversion with LabView." Advanced Materials Research 706-708 (June 2013): 1907–10. http://dx.doi.org/10.4028/www.scientific.net/amr.706-708.1907.

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Simulation technology was a very important technology in the parallel signal processing research. A type of antomatic controlling simulation system was introduced, which was built by taking LabVIEW as the software platform, using LabVIEW user interface interacting with the Simulink model. Simulation of processing often requires algorithm and performance evaluation of parallel environment. Signal processing often requires simultaneous acquisition of multi-channel analog signals. Taking dual-channel A/D conversion processes as an example, using LabVIEW with VC, it achieves a simulation of parallel signal process of A/D conversion process.
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Zhang, Yun Hu, and Chao Zhang. "16-Bit A/D CAN Interface Steering Wheel Angle and Torque Acquisition System." Advanced Materials Research 846-847 (November 2013): 144–47. http://dx.doi.org/10.4028/www.scientific.net/amr.846-847.144.

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In this paper, a steering wheel angle and torque acquisition program consisted of a steering wheel angle and torque sensor, 16-bit Σ-A/D converter, SCM and CAN bus chip is described. It describes the A / D conversion, angle and torque values calculation , CAN Communication and host computer acquisition software implementation and other important processes for the method. On this basis, the steering wheel angle and torque data collection realization is finished,and it has operated in the actual vehicle environments. The results show that the system is of high precision, good stability, and it is suitable for driving behavior tests and vehicle handling and stability test.
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Liu, Bin, Yonghao Pang, Deqiang Mao, Jing Wang, Zhengyu Liu, Ning Wang, Shenhua Liu, and Xinxin Zhang. "A rapid four-dimensional resistivity data inversion method using temporal segmentation." Geophysical Journal International 221, no. 1 (January 10, 2020): 586–602. http://dx.doi.org/10.1093/gji/ggaa019.

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SUMMARY 4-D electrical resistivity tomography (ERT), an important geophysical method, is widely used to observe dynamic processes within static subsurface structures. However, because data acquisition and inversion consume large amounts of time, rapid changes that occur in the medium during a single acquisition cycle are difficult to detect in a timely manner via 4-D inversion. To address this issue, a scheme is proposed in this paper for restructuring continuously measured data sets and performing GPU-parallelized inversion. In this scheme, multiple reference time points are selected in an acquisition cycle, which allows all of the acquired data to be sequentially utilized in a 4-D inversion. In addition, the response of the 4-D inversion to changes in the medium has been enhanced by increasing the weight of new data being added dynamically to the inversion process. To improve the reliability of the inversion, our scheme uses actively varied time-regularization coefficients, which are adjusted according to the range of the changes in model resistivity; this range is predicted by taking the ratio between the independent inversion of the current data set and historical 4-D inversion model. Numerical simulations and experiments show that this new 4-D inversion method is able to locate and depict rapid changes in medium resistivity with a high level of accuracy.
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Allen, Rebecca, Alex Nakonechnyi, and Mary Sovik Benedetti. "Anna's Story: How a Ukrainian Orphan's Acquisition of English as a Second Language Transformed Her Life." Journal of Cognitive Education and Psychology 19, no. 2 (October 1, 2020): 107–19. http://dx.doi.org/10.1891/jcep-d-19-00044.

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This article presents a case study of an adult Ukrainian orphan, Anna, who acquired English as a second and accessed U.S. higher education despite the fact that adopted children or aged out orphans face a unique constellation of educational and psychological challenges in language learning. This article presents Anna's story in her own voice and advocates for the specialized needs of the underserved, often voiceless thousands of older orphans in war-stricken Ukraine. This article suggests that access to institutional agents and social capital played a key role in Anna's success. Of interest to researchers, the article postulates common, current language learning theory perhaps may not fully explain the distinct processes of language acquisition by institutionalized, language-delayed children. The article also offers tangible lessons for educators of victims of trauma, and would thus be of interest to practitioners as well as researchers in the areas of language acquisition and educational psychology.
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Eltner, Anette, Andreas Kaiser, Carlos Castillo, Gilles Rock, Fabian Neugirg, and Antonio Abellán. "Image-based surface reconstruction in geomorphometry – merits, limits and developments." Earth Surface Dynamics 4, no. 2 (May 19, 2016): 359–89. http://dx.doi.org/10.5194/esurf-4-359-2016.

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Abstract. Photogrammetry and geosciences have been closely linked since the late 19th century due to the acquisition of high-quality 3-D data sets of the environment, but it has so far been restricted to a limited range of remote sensing specialists because of the considerable cost of metric systems for the acquisition and treatment of airborne imagery. Today, a wide range of commercial and open-source software tools enable the generation of 3-D and 4-D models of complex geomorphological features by geoscientists and other non-experts users. In addition, very recent rapid developments in unmanned aerial vehicle (UAV) technology allow for the flexible generation of high-quality aerial surveying and ortho-photography at a relatively low cost.The increasing computing capabilities during the last decade, together with the development of high-performance digital sensors and the important software innovations developed by computer-based vision and visual perception research fields, have extended the rigorous processing of stereoscopic image data to a 3-D point cloud generation from a series of non-calibrated images. Structure-from-motion (SfM) workflows are based upon algorithms for efficient and automatic orientation of large image sets without further data acquisition information, examples including robust feature detectors like the scale-invariant feature transform for 2-D imagery. Nevertheless, the importance of carrying out well-established fieldwork strategies, using proper camera settings, ground control points and ground truth for understanding the different sources of errors, still needs to be adapted in the common scientific practice.This review intends not only to summarise the current state of the art on using SfM workflows in geomorphometry but also to give an overview of terms and fields of application. Furthermore, this article aims to quantify already achieved accuracies and used scales, using different strategies in order to evaluate possible stagnations of current developments and to identify key future challenges. It is our belief that some lessons learned from former articles, scientific reports and book chapters concerning the identification of common errors or "bad practices" and some other valuable information may help in guiding the future use of SfM photogrammetry in geosciences.
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Dissertations / Theses on the topic "Processus d' acquisition"

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Lagrange, Jean-Baptiste. "Des situations connues aux traitements sur des données codifiées : représentations mentales et processus d'acquisition dans les premiers apprentissages en informatique." Paris 7, 1991. http://jb.lagrange.free.fr/Preprints/TheseLagrange.pdf.

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Stumpf, Christian [Verfasser], and Matthias [Akademischer Betreuer] Baum. "Consistency Issues in Funding, Recruitment and Customer Acquisition Processes in Entrepreneurial Firms / Christian Stumpf ; Betreuer: Matthias Baum." Kaiserslautern : Technische Universität Kaiserslautern, 2018. http://d-nb.info/1171213832/34.

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Nolte, Kerstin [Verfasser], Jann [Akademischer Betreuer] Lay, Stephan [Akademischer Betreuer] Klasen, and Matin [Akademischer Betreuer] Qaim. "Large–scale land acquisitions in sub–Saharan Africa : Determinants, processes and actors / Kerstin Nolte. Gutachter: Jann Lay ; Stephan Klasen ; Matin Qaim. Betreuer: Jann Lay." Göttingen : Niedersächsische Staats- und Universitätsbibliothek Göttingen, 2015. http://d-nb.info/1068361972/34.

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Mortehan, Olivier. "Etude des aspects stratégiques du processus de formation d'accords de collaboration chez les grands constructeurs informatiques." Doctoral thesis, Universite Libre de Bruxelles, 2003. http://hdl.handle.net/2013/ULB-DIPOT:oai:dipot.ulb.ac.be:2013/211301.

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Cette recherche a eu pour but principal de montrer, à travers l’exemple de l’industrie informatique dans les années 90, que la stratégie de partenariat est aujourd’hui devenue un outil essentiel pour permettre aux entreprises à la tête d’une industrie à forte innovation technologique, confrontée à des changements structurels importants, et en particulier à la désintégration menant au leadership technologique partagé, de maintenir leur position dominante.

Les quatre parties du travail constituent une suite logique d’étapes contribuant chacune à valider la thèse: la partie I porte sur la synthèse des principaux courants de la littérature scientifique sur les accords de collaboration et leur relation avec l’évolution des industries. Le but poursuivi dans la partie II est de décrire les changements intervenus dans l’industrie informatique au cours des années 90 et de formuler l’hypothèse d’une relation entre ces changements et la stratégie des firmes dans le domaine des accords de collaboration. Cette hypothèse est vérifiée empiriquement dans les parties III et IV à l’aide d’une banque de données sur les accords de collaboration. La partie III du travail présente les résultats descriptifs et la partie IV les résultats analytiques permettant de valider l’hypothèse.


Doctorat en sciences de gestion
info:eu-repo/semantics/nonPublished

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Heesemann, Martin [Verfasser]. "Advances in the acquisition and processing of subseafloor temperature and pressure data and their interpretation in the context of convergent margin processes / vorgelegt von Martin Heesemann." 2008. http://d-nb.info/990936651/34.

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Book chapters on the topic "Processus d' acquisition"

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Ozkul, Tarik. "D/A and A/D Converters." In Data Acquisition and Process Control Using Personal Computers, 55–90. Routledge, 2017. http://dx.doi.org/10.1201/9781315140766-3.

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"Appendix D: Standard Approval Process Example." In Mergers and Acquisitions Basics, 303. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2017. http://dx.doi.org/10.1002/9781119380726.app4.

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Zemcik, Pavel, Michal Spanel, Premysl Krsek, and Miloslav Richter. "Methods of 3D Object Shape Acquisition." In 3-D Surface Geometry and Reconstruction, 1–27. IGI Global, 2012. http://dx.doi.org/10.4018/978-1-4666-0113-0.ch001.

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This chapter contains an overview of methods for a 3D object shape from both the surface and the internal structure of the objects. The acquisition methods of interest are optical methods based on objects surface image processing and CT/NMR sensors that explore the object volume structure. The chapter also describes some methods for 3D shape processing. The focus is on 3D surface shape acquisition methods based on multiple views, methods using single view video sequences, and methods that use a single view with a controlled light source. In addition, the volume methods represented by CT/NMR are covered as well. A set of algorithms suitable for the acquired 3D data processing and simplification are shown to demonstrate how the models data can be processed. Finally, the chapter discusses future directions and then draws conclusions.
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Torii, Ippei, Yousuke Okada, Manabu Onogi, and Naohiro Ishii. "Inexpensive, Simple and Quick Photorealistic 3DCG Modeling." In E-Activity and Intelligent Web Construction, 1–12. IGI Global, 2011. http://dx.doi.org/10.4018/978-1-61520-871-5.ch001.

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The process of creating photorealistic 3-dimensional computer graphic (3DCG) images is divided into two stages: modeling and rendering. Automatic rendering has gained popularity, and photorealistic rendering is generally used to render different types of images. However, professional artists still model characters manually. Moreover, not much progress has been achieved with regard to 3-D shape data acquisition techniques that can be applied to facial modeling. This is an important problem hampering the progress of 3DCG. Generally, a laser and a highly accurate camera are used to acquire 3-D shape data. This technique is time-consuming and expensive. The eyes may be damaged during measurements by this method. In order to solve these problems, this chapter proposes a simple method for 3-D shape data acquisition using a projector and Web cameras. This method is economical, simple, and less time-consuming than conventional techniques. This chapter describes the setup of the projector and Web cameras, shape data acquisition process, image processing, and generation of a photorealistic image. As an example, the authors take a reconstructed photorealistic 3DCG image of Japanese vegetable “bitter melon,” whose surface is extremely bumpy. The authors evaluate the error margin of this technique. They also verify the accuracy of this method by comparing the photograph of a face with its rendered image.
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Lee, Keun. "The Origin of Absorptive Capacity in Korea." In How Nations Learn, 125–48. Oxford University Press, 2019. http://dx.doi.org/10.1093/oso/9780198841760.003.0007.

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Absorptive capacity (AC), defined by Cohen and Levinthal (1989, 1990) as a firm’s ability to identify, value, assimilate, and exploit knowledge from the environment, is a binding constraint for latecomer economies. Its origin is particularly relevant for latecomer countries where firms rely on imported technology. This chapter investigates how latecomer firms in Korea built absorptive capacity before being able to conduct in-house R&D, and generate innovation outcomes. Three forms of foreign technology acquisition are distinguished: know-how-only licensing, know-how-and-patent licensing, and patent-only licensing. Korean firms tend to use know-how licensing before starting in-house R&D, whereas patent licensing is not significantly linked to R&D. It seems that that the origin of AC in Korea is the learning process that follows licenced import of foreign technology, especially tacit knowledge in the form of know-how. A specific policy implication is that technology licensing contracts for a latecomer firm should include know-how transfer, and the potential substituting effect of foreign patent licensing must be considered because it may interfere with formation of in-house AC.
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Minati, Gianfranco. "The Dynamic Usage of Models (DYSAM) as a Theoretically-Based Phenomenological Tool for Managing Complexity and as a Research Framework." In Cybernetics and Systems Theory in Management, 176–90. IGI Global, 2010. http://dx.doi.org/10.4018/978-1-61520-668-1.ch010.

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In this paper, after recalling some fundamental concepts used in the science of complexity, we focus on theoretical and applicative cases of interest for the science of management of complex systems, where processes of emergence occur with the acquisition of new properties. The tool proposed is the DYnamical uSAge of Models (DYSAM). Within this framework we then focus upon a) the theoretical difference between growth and development; b) the sustainability of development rather than of growth as originally introduced in the literature; c) the concept of long tail (when, after initial large volume sales, low-revenue and infrequent buying may become a very important percentage of the entire business) as in telecommunications and management of long-tailed systems; d) non-reductionist management of complexity not reduced to solutions, and e) a future line of research to model processes of emergence.
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"Soft Systems Methodology in Technology Management Practices." In Applications of Soft Systems Methodology for Organizational Change, 129–49. IGI Global, 2021. http://dx.doi.org/10.4018/978-1-7998-4504-1.ch006.

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Technology management (TM) is a series of management disciplines designed to manage the technological fundamentals of the organizations for creation of competitive benefits. A successful technological development and commercialization can be rarely accomplished through diffused and undirected efforts. In such a complex situation, modeling can play a decisive role in the analysis of complexities and management of the dynamics of technology-based companies. In this context, the chapter describes five processes of TM, namely identification, selection, acquisition, protection, and exploitation. Soft systems methodology (SSM) is one of the soft operations research (OR) tools and techniques that can be implemented in TM phases as a hard OR. Furthermore, two case studies that addressed the use of SSM in policymaking to commercialize the new technologies and technology scenario planning in a research and development (R&D) organization will be also reviewed.
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Swierzowicz, Janusz. "Multimedia Data Mining Concept." In Data Warehousing and Mining, 3611–20. IGI Global, 2008. http://dx.doi.org/10.4018/978-1-59904-951-9.ch225.

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The development of information technology is particularly noticeable in the methods and techniques of data acquisition, high-performance computing, and bandwidth frequency. According to a newly observed phenomenon, called a storage low (Fayyad & Uthurusamy, 2002), the capacity of digital data storage is doubled every 9 months with respect to the price. Data can be stored in many forms of digital media, for example, still images taken by a digital camera, MP3 songs, or MPEG videos from desktops, cell phones, or video cameras. Such data exceeds the total cumulative handwriting and printing during all of recorded human history (Fayyad, 2001). According to current analysis carried out by IBM Almaden Research (Swierzowicz, 2002), data volumes are growing at different speeds. The fastest one is Internet-resource growth: It will achieve the digital online threshold of exabytes within a few years (Liautaud, 2001). In these fast-growing volumes of data environments, restrictions are connected with a human’s low data-complexity and dimensionality analysis. Investigations on combining different media data, multimedia, into one application have begun as early as the 1960s, when text and images were combined in a document. During the research and development process, audio, video, and animation were synchronized using a time line to specify when they should be played (Rowe & Jain, 2004). Since the middle 1990s, the problems of multimedia data capture, storage, transmission, and presentation have extensively been investigated. Over the past few years, research on multimedia standards (e.g., MPEG-4, X3D, MPEG-7) has continued to grow. These standards are adapted to represent very complex multimedia data sets; can transparently handle sound, images, videos, and 3-D (three-dimensional) objects combined with events, synchronization, and scripting languages; and can describe the content of any multimedia object. Different algorithms need to be used in multimedia distribution and multimedia database applications. An example is an image database that stores pictures of birds and a sound database that stores recordings of birds (Kossmann, 2000). The distributed query that asks for “top ten different kinds of birds that have black feathers and a high voice” is described there by Kossmann (2000, p.436).
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Conference papers on the topic "Processus d' acquisition"

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Yu, Paul C., and Hae-Seung Lee. "A CMOS Resistive-fuse Processor for 2-D Image Acquisition, Smoothing, and Segmentation." In Eighteenth European Solid-State Circuits Conference (ESSCIRC '92). IEEE, 1992. http://dx.doi.org/10.1109/esscirc.1992.5468379.

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Bellan, Diego. "Amplitude estimation of a sine wave with unknown offset in A/D conversion processes." In 2009 IEEE International Workshop on Intelligent Data Acquisition and Advanced Computing Systems: Technology and Applications (IDAACS). IEEE, 2009. http://dx.doi.org/10.1109/idaacs.2009.5342935.

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Holzmuller-Laue, S., K. Rimane, S. Neubert, S. Kreuzfeld, D. Arndt, B. Gode, K. Thurow, and R. Stoll. "Flexible R&D integration platform of process informatics for automated medical applications and mobile data acquisition." In 2008 IEEE International Conference on Automation Science and Engineering (CASE 2008). IEEE, 2008. http://dx.doi.org/10.1109/coase.2008.4626456.

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Sturges, Robert H., and David O. Hunt. "Detection and Evaluation of Planes of Partial Symmetry in CAD Models." In ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0087.

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Abstract Components with subtle asymmetry require more handling time in manual and automatic assembly. Models of assembly processes predict that almost half of the acquisition effort derives from the recognition of feature subtlety and the symmetries of the part. An algorithm is presented which detects and evaluates the axes of symmetry and partial symmetry for a wide variety of asymmetries, features, and aspect ratios. The orientations of the partial symmetry axes are then used to calculate the effect on assembly time. The ability to locate axes in an object that are not orthogonal is demonstrated. Currently the algorithm can only examine 2-D shapes, and an approach to fully automated evaluation of a 3-D object is presented.
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Tani, Giovanni, Leonardo Orazi, and Gabriele Cuccolini. "An Automated Procedure for the Geometrical Characterization of Root Canals." In ASME 2008 9th Biennial Conference on Engineering Systems Design and Analysis. ASMEDC, 2008. http://dx.doi.org/10.1115/esda2008-59337.

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In this work an original system for the geometrical characterization of root canals for dental implants was developed and tested. The aim of this work is to determine the shape and the size of the posts that best fit a statistical population of root canals with a defined maximum amount of removed tissue. The task is performed by an accurate acquisition of the shape of a statistically significant batches of root impressions: the geometry are then processed to obtain the post geometry. The acquisition is carried out using a conoscopic laser scanning device mounted on a 4 axis controlled CNC measurement system. The shape of the root canals were measured for each type of tooth, obtaining an average 3-D computer design of the canal profiles. Several comparisons between the acquired geometry and the representative forms of commercial posts are finally presented.
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Denizhan, Onur, and Meng-Sang Chew. "Incorporating 3D Printing to Bridge Two Introductory Courses in Mechanical Engineering." In ASME 2020 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/imece2020-23338.

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Abstract A course in Computer Graphics using SolidWorks™ is one of the very first courses that a Mechanical Engineering major would take within the department at Lehigh University. In this course, students learn the basics of engineering graphics with a view towards engineering design. Such a course gives students an overall view of not just the mechanics of creating engineering drawings using SolidWorks, but also one of understanding the consequences of their drawings as they affect tolerances, material selection, fabrication processes as well as the viability of their designs. The very next introductory mechanical engineering course is a laboratory dealing with engineering measurements, data acquisition and testing. This article reports on the use of a 3-D printing exercise to bridge these two somewhat very different courses with different objectives, thereby giving students an early start into understanding the process of design; from a concept to its design and fabrication, and finally, testing and analysis of data. Moreover, it gives a fundamental understanding of the use of 3-D printing that many students would end up using for their Senior Design course in their senior year.
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7

Peng, Tao, and Satyandra K. Gupta. "Algorithms for Generating Adaptive Projection Patterns for 3-D Shape Measurement." In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35452.

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Point cloud acquisition using digital fringe projection (PCCDFP) is a non-contact technique for acquiring dense point clouds to represent the 3-D shapes of objects. Most existing PCCDFP systems use projection patterns consisting of straight fringes with fixed fringe pitches. In certain situations, such patterns do not give the best results. In our earlier work, we have shown that in some situations, patterns that use curved fringes with spatial pitch variation can significantly improve the process of constructing point clouds. This paper describes algorithms for automatically generating adaptive projection patterns that use curved fringes with spatial pitch variation to provide improved results for an object being measured. In addition, we also describe the supporting algorithms that are needed for utilizing adaptive projection patterns. Both simulation and physical experiments show that, adaptive patterns are able to achieve improved performance, in terms of measurement accuracy and coverage, than fixed-pitch straight fringe patterns.
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Klepper, Jason B., A. Greg Denny, Robert H. Nichols, and Jerome C. Jenkins. "Overview of A-10 Propulsion Analysis Using the HPCMP Create™-AV Kestrel Product With Firebolt Propulsion Component." In ASME Turbo Expo 2015: Turbine Technical Conference and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/gt2015-44158.

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The High Performance Computing Modernization Program (HPCMP) is developing high-fidelity simulation tools through the Computational Research and Engineering Acquisition Tools and Environments (CREATE™) program. CREATE-AV is the component of the CREATE program focused on air vehicles. Kestrel is the simulation product for fixed-wing aircraft in the CREATE-AV program. To investigate engine/inlet system performance and operability issues, the Kestrel product includes the capability to model propulsion components in aircraft simulations through the Firebolt propulsion component. Firebolt Capability 1 accounts for propulsion system effects by integrating a 0-D engine model directly into the computational fluid dynamics (CFD) process. Firebolt Capability 2 extends the capability by enabling the user to couple full-annulus 3-D rotating turbomachinery into the aircraft CFD simulation. This paper gives an overview of the Kestrel product including the Firebolt propulsion capability. In addition, this paper will demonstrate Firebolt Capability 1 and 2 by applying a 0-D TF34-GE-100A engine model and a TF34 3-D full annulus rotating turbomachinery fan in an A-10 aircraft CFD simulation. Finally, the inlet performance for the nacelles with both the 0-D engine model and full-annulus turbomachinery fan will be compared to subscale wind tunnel inlet test data.
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Matheus, Justo, Maja Ignova, and Darwin Amaya. "A Medical-Inspired Framework to Classify Downhole Shocks Waveforms While Drilling." In SPE/IADC International Drilling Conference and Exhibition. SPE, 2021. http://dx.doi.org/10.2118/204098-ms.

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Abstract This paper presents a medical approach to classify shock waveforms acquired at 31,250 hertz downhole. The shock signals are treated as drilling electrocardiogram (D-ECG). The D-ECGs are processed using clustering algorithms and merged with drilling incidents to identify an arrhythmic signature pattern that can lead to catastrophic failures. In medicine, the analysis of heartbeat cycles in an electrocardiogram signal is very important for monitoring heart patients. In the drilling industry, downhole shocks are present most of the time. They are present so often that the authors introduce the concept of drilling electrocardiogram (D-ECG) based on shock waveforms acquired at high frequency. The shock module was implemented in hardware using a field programmable gate array (FPGA) and run inside the control unit of an RSS to complement the navigation systems composed. The shock acquisition and processing are performed at 31,250 Hz, providing enough bandwidth to fully reconstruct high-frequency events. A novel methodology combining field incidents with machine learning clustering algorithms is proposed to identify arrhythmic shocks signatures and whirl and bit bounce in real time, preventing failures to the BHA.
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Pop, Petru A., Patricia A. Ungur, Liviu Lazar, and Florin M. Marcu. "Practical Methods Used for Determination of Elastic Characteristics of Gypsum Materials." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34167.

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The paper is presented a dynamic installation used for determination the elastic characteristics of gypsum materials, such as elasticity modulus-E, rigidity modulus-G, etc. This dynamic installation is composed from: mechanical device for application of axial force, cylindrical gypsum samples on which are fixed 2 strain gages, 2 bridges circuit type “Switch & Balance Unite SB-10 with digital Strain Indicator-P3500, A/D board and PC. As the samples are used two cylinders with differently gypsum compositions: gypsum of dressing and light orthopedic corsets, and from gypsum with sonic absorbent and thermal isolator properties. The acquisition and the interpretation of data with MATLAB program is realized, by used two original programs: “Daquest-2m” for acquisition data, and “Evaluation-1m” for calculation and plot diagram of shock wave time. By determination of shock propagation time passing through the gypsum sample can be calculated the wave velocity and the elasticity modulus of gypsum tested. For building materials on base of gypsum with special applications in medicine, and panels with sonic absorbent and thermal isolator properties are demand to determine the elastic characteristics to enhance the manufacturing process and usefully.
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