To see the other types of publications on this topic, follow the link: 3-D digital model.
Journal articles on the topic '3-D digital model'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the top 50 journal articles for your research on the topic '3-D digital model.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.
1
Sullivan, Elaine A., and Lisa M. Snyder. "Digital Karnak:." Journal of the Society of Architectural Historians 76, no. 4 (December 1, 2017): 464–82. http://dx.doi.org/10.1525/jsah.2017.76.4.464.
Full textAbstract:
Archaeologists, historians, and art historians are increasingly turning to three-dimensional computer modeling to create dynamic visualizations of ancient monuments and urban spaces, but the resulting 3-D content is not always accepted as scholarship and integrated into discipline-specific dialogue. In Digital Karnak: An Experiment in Publication and Peer Review of Interactive, Three-Dimensional Content, Elaine A. Sullivan and Lisa M. Snyder propose a reconceptualization of computer modeling as a new means and form of knowledge production, offer a framework for peer review and publication of 3-D content, and describe an experiment to develop an innovative publication with an interactive computer model at its core. The Digital Karnak model, a geotemporal model of an ancient Egyptian temple, is their case study, a 3-D publication package of which they posted for peer review. This article describes the model's creation, the software interface used for the publication prototype (VSim), and the ways in which this project addresses the challenges of publishing 3-D scholarly content.
2
Riquelme, Adrián, Roberto Tomás, Miguel Cano, José Luis Pastor, Brian Gootee, and Joseph P. Cook. "Reconstruction of earth fissures 3-D from videos." Proceedings of the International Association of Hydrological Sciences 382 (April 22, 2020): 677–81. http://dx.doi.org/10.5194/piahs-382-677-2020.
Full textAbstract:
Abstract. Earth fissures are pervasive cracks that develop on valley floors as a consequence of land subsidence associated with extensive groundwater withdrawal. To capture geometrical, geological and geotechnical information of ground fissures is of paramount importance for their characterization. Recent advances in remote sensing techniques and the accessibility to remotely piloted aircraft systems (RPAS) as well as the evolution of onboard digital cameras enable the capture of digital photos and videos. Using digital photos along with the Structure from Motion (SfM) technique and following certain strategies, we can reconstruct a 3-D model of the earth fissures under study. This technique requires digital photos, but when a digital video is available, we can convert it into a set of frames and equally apply the procedure. Besides, the extraction of frames from a video assures a key condition for the SfM technique: the overlap between photos. The resulting 3-D model should be scaled and oriented using a rigid transformation matrix or even better including ground control points (GCP) into the captured photos or frames. The latter enables the geo-referencing of the point cloud and the correction of linear and non-linear deformations. In this work, the proposed methodology is illustrated through the application of SfM technique to a high-resolution video downloaded from YouTube (i.e. https://youtu.be/9xdAnftBKvY, last access: 20 February 2020). The video shows a mile-long earth fissure that appeared sometime between March 2014 and December 2014 near the Tator Hills (Arizona, USA) over Quaternary sediments. The Arizona Geological Survey captured these videos using an RPAS. The frames of the video were downloaded and extracted using a simple Matlab code. Then, we sub-sampled the frames and processed them using the software Agisoft Metashape Professional. Finally, we got metric data from Google Earth and generated a 3-D model. The quality of the 3-D model strongly depends on the quality of the photos and the GCP. However, this study shows the potential of this technique, instrumentation and data available on Internet for the development of 3-D point clouds and 3-D models for the detailed analysis of earth fissures.
3
Kumazaki, Tatsuo. "Rotational stereo-digital radiography. Theoretical model of new 3-D angiography display." Journal of Nippon Medical School 59, no. 6 (1992): 441–49. http://dx.doi.org/10.1272/jnms1923.59.441.
Full text
4
OOSAWA, Norihito, and Yusuke FUKUSHIMA. "A 2-D model of powder snow avalanches with variable width using 3-D digital map." Journal of the Japanese Society of Snow and Ice 66, no. 4 (2004): 473–83. http://dx.doi.org/10.5331/seppyo.66.473.
Full text
5
Hansman, Reuben J., and Uwe Ring. "Workflow: From photo-based 3-D reconstruction of remotely piloted aircraft images to a 3-D geological model." Geosphere 15, no. 4 (May 8, 2019): 1393–408. http://dx.doi.org/10.1130/ges02031.1.
Full textAbstract:
AbstractGeological field mapping is a vital first step in understanding geological processes. During the 20th century, mapping was revolutionized through advances in remote sensing technology. With the recent availability of low-cost remotely piloted aircraft (RPA), field geologists now routinely carry out aerial imaging without the need to use satellite, helicopter, or airplane systems. RPA photographs are processed by photo-based three-dimensional (3-D) reconstruction software, which uses structure-from-motion and multi-view stereo algorithms to create an ultra-high-resolution, 3-D point cloud of a region or target outcrop. These point clouds are analyzed to extract the orientation of geological structures and strata, and are also used to create digital elevation models and photorealistic 3-D models. However, this technique has only recently been used for structural mapping. Here, we outline a workflow starting with RPA data acquisition, followed by photo-based 3-D reconstruction, and ending with a 3-D geological model. The Jabal Hafit anticline in the United Arab Emirates was selected to demonstrate this workflow. At this anticline, outcrop exposure is excellent and the terrain is challenging to navigate due to areas of high relief. This makes for an ideal RPA mapping site and provides a good indication of how practical this method may be for the field geologist. Results confirm that RPA photo-based 3-D reconstruction mapping is an accurate and cost-efficient remote sensing method for geological mapping.
6
Liang, Ge. "The Search of Modularized Digital Modeling and Structural Parameter Design Based on 3-D Product Model." Advanced Materials Research 466-467 (February 2012): 626–30. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.626.
Full textAbstract:
The full 3-D digital model is taken as the basis, and the complex missiles are chosen for the research object. The product structure is studied. The digital modeling of the product and structural parameters technology with the modular design techniques and the key technology will be discussed as well.
7
Shelburne, Edward. "Producing High-Quality 3-D Models for Specimen Research with the Creaform 3-D Scanner at the Sternberg Museum of Natural History." Biodiversity Information Science and Standards 2 (June 15, 2018): e25908. http://dx.doi.org/10.3897/biss.2.25908.
Full textAbstract:
Digitization of natural history collections for specimen accessibility, research, and posterity has been a major push in museums over the past decade. One increasingly common form of specimen digitization is three-dimensional (3-D) surface scanning. There are numerous 3-D scanners on the market, including visible light and laser surface scanners. However, mobility of the scanning device, mesh resolution, and texture fidelity are among the most prominent issues facing regular implementation of 3-D scanning procedures for research purposes. Morphometrics research involving the digitization of Xiphactinus at the Sternberg Museum of Natural History (FHSM) using a Creaform Go!SCAN 50 visible light 3-D surface scanner has necessitated the development of a workflow using this 3-D scanner and the associated VXelements software. This workflow maximizes model quality with minimal loss of speed or efficiency when scanning numerous specimens. Major components of this workflow include proper use of positioning targets, appropriate merging of multiple specimen scans, and how to perform post-processing on models without sacrificing model resolution or texture. The primary benefit of the Creaform 3-D scanner is hardware mobility, allowing for use on large exhibited specimens or digitizing specimens during research trips. Shortcomings include relatively low mesh resolution, (bottoming out at 0.5 mm), difficulty scanning highly complex structures, and low texture fidelity of scanned models. However, texture fidelity can be improved through use of the free software, Meshlab, by overlaying high-quality stacked photographs onto the 3-D mesh. Incorporating Meshlab texture overlays into the workflow allows for the production of digital models with improved color and textural data – ideal for accurate visualization of specimens in 3-D viewers for educational outreach and online databases. While not perfect for all applications, the Creaform 3-D scanner allows for rapid digitization of specimens in an increasingly digital collections environment, and is sufficient for some research applications. The workflow established at the FHSM can serve as a framework for other institutions to use the Creaform 3-D scanner to best suit their digitization needs.
8
Walker, Stewart, and Arleta Pietrzak. "Remote measurement methods for 3-D modeling purposes using BAE Systems’ Software." Geodesy and Cartography 64, no. 1 (June 1, 2015): 113–24. http://dx.doi.org/10.1515/geocart-2015-0009.
Full textAbstract:
Abstract Efficient, accurate data collection from imagery is the key to an economical generation of useful geospatial products. Incremental developments of traditional geospatial data collection and the arrival of new image data sources cause new software packages to be created and existing ones to be adjusted to enable such data to be processed. In the past, BAE Systems’ digital photogrammetric workstation, SOCET SET®, met fin de siècle expectations in data processing and feature extraction. Its successor, SOCET GXP®, addresses today’s photogrammetric requirements and new data sources. SOCET GXP is an advanced workstation for mapping and photogrammetric tasks, with automated functionality for triangulation, Digital Elevation Model (DEM) extraction, orthorectification and mosaicking, feature extraction and creation of 3-D models with texturing. BAE Systems continues to add sensor models to accommodate new image sources, in response to customer demand. New capabilities added in the latest version of SOCET GXP facilitate modeling, visualization and analysis of 3-D features.
9
Chaabouni-Chouayakh, Houda, Isabel Rodes Arnau, and Peter Reinartz. "Towards automatic 3-D change detection through multi-spectral and digital elevation model information fusion." International Journal of Image and Data Fusion 4, no. 1 (March 2013): 89–101. http://dx.doi.org/10.1080/19479832.2012.739577.
Full text
10
Tu, Kuo-Yang, Huan-Yu Lin, and Tsu-Tian Lee. "Rapidly constructing a simple 3-D graphic model using a consumer-user digital still camera." IEEE Transactions on Consumer Electronics 52, no. 3 (August 2006): 819–24. http://dx.doi.org/10.1109/tce.2006.1706475.
Full text
11
Kakizaki, Takao, Jiro Urii, Mitsuru Endo, and Keisuke Shimatsu. "316 Experimental Investigation for Aircraft Disaster Evacuation Simulation Using 3-D Kinematic Digital Human Model." Proceedings of Manufacturing Systems Division Conference 2014 (2014): 109–10. http://dx.doi.org/10.1299/jsmemsd.2014.109.
Full text
12
Liu, H., M. Hou, and Y. Hu. "A REVIEW OF DIGITAL WATERMARKING AND COPYRIGHT CONTROL TECHNOLOGY FOR CULTURAL RELICS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLII-3 (April 30, 2018): 1055–59. http://dx.doi.org/10.5194/isprs-archives-xlii-3-1055-2018.
Full textAbstract:
With the rapid growth of the application and sharing of the 3-D model data in the protection of cultural relics, the problem of Shared security and copyright control of the three-dimensional model of cultural relics is becoming increasingly prominent. Followed by a digital watermarking copyright control has become the frontier technology of 3-D model security protection of cultural relics and effective means, related technology research and application in recent years also got further development. 3-D model based on cultural relics digital watermarking and copyright control technology, introduces the research background and demand, its unique characteristics were described, and its development and application of the algorithm are discussed, and the prospects of the future development trend and some problems and the solution.
13
Partovi, Fraundorfer, Bahmanyar, Huang, and Reinartz. "Automatic 3-D Building Model Reconstruction from Very High Resolution Stereo Satellite Imagery." Remote Sensing 11, no. 14 (July 11, 2019): 1660. http://dx.doi.org/10.3390/rs11141660.
Full textAbstract:
Recent advances in the availability of very high-resolution (VHR) satellite data together withefficient data acquisition and large area coverage have led to an upward trend in their applicationsfor automatic 3-D building model reconstruction which require large-scale and frequent updates,such as disaster monitoring and urban management. Digital Surface Models (DSMs) generatedfrom stereo satellite imagery suffer from mismatches, missing values, or blunders, resulting inrough building shape representations. To handle 3-D building model reconstruction using suchlow-quality DSMs, we propose a novel automatic multistage hybrid method using DSMs togetherwith orthorectified panchromatic (PAN) and pansharpened data (PS) of multispectral (MS) satelliteimagery. The algorithm consists of multiple steps including building boundary extraction anddecomposition, image-based roof type classification, and initial roof parameter computation whichare prior knowledge for the 3-D model fitting step. To fit 3-D models to the normalized DSM(nDSM) and to select the best one, a parameter optimization method based on exhaustive searchis used sequentially in 2-D and 3-D. Finally, the neighboring building models in a building blockare intersected to reconstruct the 3-D model of connecting roofs. All corresponding experimentsare conducted on a dataset including four different areas of Munich city containing 208 buildingswith different degrees of complexity. The results are evaluated both qualitatively and quantitatively.According to the results, the proposed approach can reliably reconstruct 3-D building models, eventhe complex ones with several inner yards and multiple orientations. Furthermore, the proposedapproach provides a high level of automation by limiting the number of primitive roof types and byperforming automatic parameter initialization.
14
Triantafyllou, A., A. Watlet, S. Le Mouélic, T. Camelbeeck, F. Civet, O. Kaufmann, Y. Quinif, and S. Vandycke. "3-D digital outcrop model for analysis of brittle deformation and lithological mapping (Lorette cave, Belgium)." Journal of Structural Geology 120 (March 2019): 55–66. http://dx.doi.org/10.1016/j.jsg.2019.01.001.
Full text
15
Yetti, Wirda, and Ahyanuardi Ahyanuardi. "Pengembangan Modul E-Learning Berbasis LMS Sebagai Media Interaktif Pada Pelajaran Simulasi Dan Komukasi Digital." INVOTEK: Jurnal Inovasi Vokasional dan Teknologi 20, no. 3 (October 30, 2020): 81–88. http://dx.doi.org/10.24036/invotek.v20i3.839.
Full textAbstract:
Penggunaan media yang tepat dapat menjadi salah satu solusi dalam melengkapi strategi pembelajaran yang tepat, salah satu media yang cocok dalam era digitalisasi saat ini adalah modul e-learning, modul E-learning yang merupakan sumber belajar yang kekinian sesuai dengan perkembangan teknologi. Oleh karena itu, tujuan dari penelitian adalah untuk mengembangkan modul e-learning berbasis LMS sebagai media interaktif pada mata pelajaran simulasi dan komunikasi digital. Model pengembangan yang digunakan adalah pengembangan model 4-D (Four D Models), yang terdiri dari define, design, development dan disseminate. Sampel penelitian ini adalah 3 orang validator desain dan 3 orang validator materi. Sedangkan uji praktikalitas yaitu 3 orang guru dan 30 orang siswa SMKN 1 Lubuksikaping pada mata diklat Simulasi dan Komunikasi Digital Kelas X DPIB dan Untuk uji validitas dan praktikalitas menggunakan angket. Berdasarkan hasil penelitian didapatkan bahwa uji modul e-learning terbukti valid dan praktis untuk digunakan pada pembelajaran simulasi dan komunikasi digital, sehingga dapat. Disimpulkan bahwa modul e-learning ini dapat digunakan sebagai media pembelajaran pada pembelajaran simulasi dan komunikasi digital.
16
Carpenter, Chris. "Digital Transformation Enables Automated Real-Time Torque-and-Drag Modeling." Journal of Petroleum Technology 73, no. 01 (January 1, 2021): 69–70. http://dx.doi.org/10.2118/0121-0069-jpt.
Full textAbstract:
This article, written by JPT Technology Editor Chris Carpenter, contains highlights of paper SPE 199670, “Digital Transformation Strategy Enables Automated Real-Time Torque-and-Drag Modeling,” by Dingzhou Cao, Occidental Petroleum; Don Hender, SPE, IPCOS; and Sam Ariabod, Apex Systems, et al., prepared for the 2020 IADC/SPE International Drilling Conference, Galveston, Texas, 3-5 March. The paper has not been peer reviewed. Automated real-time torque-and-drag (RT-T&D) analysis compares real-time measurements with evergreen models to monitor and manage downhole wellbore friction, improving drilling performance and safety. Enabling RT-T&D modeling with contextual well data, rig-state detection, and RT-interval event filters poses significant challenges. The complete paper presents a solution that integrates a physics-based T&D stiff/soft string model with a real-time drilling (RTD) analytics system using a custom-built extract, transform, and load (ETL) translator and digital-transformation applications to automate the T&D modeling work flow. Methodology A T&D representational state transfer (REST) application program interface (API) was integrated with an RTD analytics system capable of receiving and processing both real-time (hookload, torque, and rig-state) and digitized (drillstring and casing components, trajectory profiles, and mud-property) well data across multiple platforms. This strategy consists of four parts: Digital transformation apps, ETL, and translator Physics-based stiff/soft string T&D model API Pre-existing data infrastructure RTD analytics system The data-flow architecture reveals a flexible design in the sense that it can accommodate different types of T&D models or any other physics-based REST API models (e.g., drillstring buckling or drilling hydraulics) and can be accessed offline for prejob/post-job planning. Drilling engineers can also leverage the RTD systems’ historical database to perform recalculations, comparative analysis, and friction calibrations. The RT-T&D model also can be deployed in a cloud environment to ensure that horizontal scalability is achieved.
17
Padarian, José, Budiman Minasny, and Alex B. McBratney. "Using deep learning for digital soil mapping." SOIL 5, no. 1 (February 26, 2019): 79–89. http://dx.doi.org/10.5194/soil-5-79-2019.
Full textAbstract:
Abstract. Digital soil mapping (DSM) has been widely used as a cost-effective method for generating soil maps. However, current DSM data representation rarely incorporates contextual information of the landscape. DSM models are usually calibrated using point observations intersected with spatially corresponding point covariates. Here, we demonstrate the use of the convolutional neural network (CNN) model that incorporates contextual information surrounding an observation to significantly improve the prediction accuracy over conventional DSM models. We describe a CNN model that takes inputs as images of covariates and explores spatial contextual information by finding non-linear local spatial relationships of neighbouring pixels. Unique features of the proposed model include input represented as a 3-D stack of images, data augmentation to reduce overfitting, and the simultaneous prediction of multiple outputs. Using a soil mapping example in Chile, the CNN model was trained to simultaneously predict soil organic carbon at multiples depths across the country. The results showed that, in this study, the CNN model reduced the error by 30 % compared with conventional techniques that only used point information of covariates. In the example of country-wide mapping at 100 m resolution, the neighbourhood size from 3 to 9 pixels is more effective than at a point location and larger neighbourhood sizes. In addition, the CNN model produces less prediction uncertainty and it is able to predict soil carbon at deeper soil layers more accurately. Because the CNN model takes the covariate represented as images, it offers a simple and effective framework for future DSM models.
18
YAMASAKI, Motoya, Toshio TERAO, Keiichi YASUDA, and Norio TASHIRO. "A 3-D MODEL FOR OPTIMAL ALIGNMENT SEARCH SYSTEM OF HIGHWAY DESIGN BY EXTENDED DIGITAL MAPPING DATA." Doboku Gakkai Ronbunshuu D 64, no. 4 (2008): 580–85. http://dx.doi.org/10.2208/jscejd.64.580.
Full text
19
Lebrun, Renaud, and Maëva J. Orliac. "MORPHOMUSEUM: AN ONLINE PLATFORM FOR PUBLICATION AND STORAGE OF VIRTUAL SPECIMENS." Paleontological Society Papers 22 (September 2016): 183–95. http://dx.doi.org/10.1017/scs.2017.14.
Full textAbstract:
AbstractSince the early 1990s, methods for the acquisition of three-dimensional (3-D) data and computer-assisted techniques for the visualization of such data have grown increasingly popular among biologists, paleontologists, and paleoanthropologists. However, thus far no standardized repository for complex virtual models based on 3-D digital data of specimens has emerged, whereas the need for researchers to provide access to 3-D models of specimens as well as the pressure imposed on authors by scientific journals to make original 3-D morphological data publicly available have increased. MorphoMuseuM (M3) aims to fill this gap. M3 is both a peer-reviewed scientific journal (M3 Journal) and a virtual specimen repository (M3 Repository). All scientific articles and their associated 3-D models deposited in M3 go through a formal review process. Each published model is given a DOI and a unique identifier code, which should be cited by researchers using this model in their scientific publications. In this paper, we describe the place of M3 among other online repositories for 3-D data, and explain how the growing community of biologists working with 3-D data can benefit from using M3.
20
Zhou, Jian Jun, and Zhen Xing Yang. "3-D Geological Modeling of Complicated Underground Engineering by B-Rep and NURBS." Advanced Materials Research 1065-1069 (December 2014): 442–45. http://dx.doi.org/10.4028/www.scientific.net/amr.1065-1069.442.
Full textAbstract:
In order to obtain 3-D geological modeling and visualization of complicated underground engineering, a 3-D geological visualization modeling based on data structures of B-Rep and NURBS is proposed. Through comprehensive analysis of common data structure for describing the space topology in the field of computer graphics, rapid establishment of accurate topological relation of 3-D geological models for underground engineering in complicated geological conditions and cavern groups is achieved. And the high-quality geometrical data and topological relation information for the geological visualization of slope engineering are provided. By taking a large coal mine as an example, the 3-D visualization model with many functional applications based on geological information is given, which provides a basic platform for the realization of 3-D digital management.
21
Jiang, Hong, Wen Lei Sun, Yong Fang Shi, and Yan Hua Huang. "Research of Three-Dimensional Geometrical Modeling Based on the Reverse Engineering." Advanced Materials Research 211-212 (February 2011): 1100–1104. http://dx.doi.org/10.4028/www.scientific.net/amr.211-212.1100.
Full textAbstract:
This paper introduces the basic conception of the reverse engineering, process of digital measurement and 3-D modeling method based RE technology: one is based on point-curve-curved surface reconstruction, and the other is based on point-curved surface fitting directly. According to the first method, the processes of data gathering, cloud data processing and 3-D model rebuilding are introduced through reconstructing the 3-D models of the gauge board and left board in Imageware and UGNX. Using the reverse engineering technology in product design will shorten the period of developing a new product and accelerate it’s response to the market.
22
Chen, Liang Chia, Ching Wen Liang, Huan Yu Tseng, and Shyh Tsong Lin. "Accurate 3-D Surface Profilometry Using Novel Boundary Edge Detection on Digital Image Correlation." Applied Mechanics and Materials 870 (September 2017): 295–302. http://dx.doi.org/10.4028/www.scientific.net/amm.870.295.
Full textAbstract:
A novel 3-D edge detection methodology is developed to resolve the edge ambiguity problem encountered in 3-D optical surface profilometry employing digital image correlation (DIC). DIC has been surged as a full-field measurement technique for in-plane and out-of-plane dynamic mechanical structure analyses. However, up to date, one of the key issues in DIC is still remained in boundary edge detection since a surface edge is not detectable between two discrete neighboring height jumps due to optical diffraction. Generally, it is common to observe undesirable noisy measured data along surface edges in traditional DIC-based surface 3-D profilometry. To resolve this, a novel random speckle images processing method is established by proposing a new algorithm by employing the multiple symmetric partial template model to determine best edge location with accurate height reconstruction. A theoretical simulation on a pre-calibrated circle target was performed to verify the feasibility of the methodology. Some experiments on real industrial objects having various surface reflective characteristics were implemented to verify its capability on accurate detection of industrial objects having discrete surface edges. From its preliminary evaluation on measurement accuracy, it is found that the maximum measured error on critical dimension can be controlled within less than 6.0% of the overall measuring range while one standard deviation can be kept within less than 1.2%.
23
Mergili, M., I. Marchesini, M. Alvioli, M. Metz, B. Schneider-Muntau, M. Rossi, and F. Guzzetti. "A strategy for GIS-based 3-D slope stability modelling over large areas." Geoscientific Model Development 7, no. 6 (December 15, 2014): 2969–82. http://dx.doi.org/10.5194/gmd-7-2969-2014.
Full textAbstract:
Abstract. GIS-based deterministic models may be used for landslide susceptibility mapping over large areas. However, such efforts require specific strategies to (i) keep computing time at an acceptable level, and (ii) parameterize the geotechnical data. We test and optimize the performance of the GIS-based, 3-D slope stability model r.slope.stability in terms of computing time and model results. The model was developed as a C- and Python-based raster module of the open source software GRASS GIS and considers the 3-D geometry of the sliding surface. It calculates the factor of safety (FoS) and the probability of slope failure (Pf) for a number of randomly selected potential slip surfaces, ellipsoidal or truncated in shape. Model input consists of a digital elevation model (DEM), ranges of geotechnical parameter values derived from laboratory tests, and a range of possible soil depths estimated in the field. Probability density functions are exploited to assign Pf to each ellipsoid. The model calculates for each pixel multiple values of FoS and Pf corresponding to different sliding surfaces. The minimum value of FoS and the maximum value of Pf for each pixel give an estimate of the landslide susceptibility in the study area. Optionally, r.slope.stability is able to split the study area into a defined number of tiles, allowing parallel processing of the model on the given area. Focusing on shallow landslides, we show how multi-core processing makes it possible to reduce computing times by a factor larger than 20 in the study area. We further demonstrate how the number of random slip surfaces and the sampling of parameters influence the average value of Pf and the capacity of r.slope.stability to predict the observed patterns of shallow landslides in the 89.5 km2 Collazzone area in Umbria, central Italy.
24
Strzecki, Adrian, Sławomir Miechowicz, and Elżbieta Pawłowska. "Analysis of dental and skeletal changes after Rapid Maxillary Expansion – CBCT and 3-D digital model – case report." Journal of Stomatology (Czasopismo Stomatologiczne) 67, no. 1 (January 1, 2014): 99–113. http://dx.doi.org/10.5604/00114553.1083346.
Full text
25
Kojima, Hiroyuki, Kenji Machida, and Zu Guang Zhang. "Three-Dimensional Stress Analysis by a Digital Image Correlation Method and the Three-Dimensional Local Hybrid Method." Key Engineering Materials 462-463 (January 2011): 106–11. http://dx.doi.org/10.4028/www.scientific.net/kem.462-463.106.
Full textAbstract:
Most measurement by experiment is about a structure surface and it is dramatically difficult to measure the stress state inside a structure. Although the stress analysis of a big structure is possible by the 3-D finite element method, great time, labor, and expense are needed for modeling and calculation. Then, we developed the 3-D local hybrid method which analyzes only the local model of a structure and can evaluate the stress field inside it from surface data obtained by easy measurement. In previous studies, the good result was obtained with the surface cracked specimen subjected to uniform tension and a cantilever subjected to bending. However, with an actual structure, it is not thought that simple bending deformation which is produced under an experiment environment arises. In this study we examined whether the 3-D local hybrid method would be able to apply to the structure subjected to bending and torsion by using the displacement on front surface and the displacement of upper and lower sides of a local model. It was clarified that the 3-D local hybrid method is very useful to the 3-D stress analysis of the structure subjected to the complicated loading (uniform, bending and torsion, etc.).
26
Bianchi, Maria Giovanna, Giuseppe Casula, Francesco Cuccuru, Silvana Fais, Paola Ligas, and Concetta Ferrara. "Three-dimensional imaging from laser scanner, photogrammetric and acoustic non-destructive techniques in the characterization of stone building materials." Advances in Geosciences 45 (July 27, 2018): 57–62. http://dx.doi.org/10.5194/adgeo-45-57-2018.
Full textAbstract:
Abstract. When combined, the three-dimensional imaging of different physical properties of architectural monumental structures acquired through different methodologies can highlight with efficiency the characteristics of the stone building materials. In this work, we compound high resolution Digital Color Images (DCI) and Terrestrial Laser Scanner (TLS) data for a dense 3-D reconstruction of an ancient pillar in a nineteenth century building in the town of Cagliari, Italy. The TLS technique was supported by a digital photogrammetry survey in order to obtain a natural color texturized 3-D model of the studied pillar. Geometrical anomaly maps showing interesting analogies were computed both from the 3-D model derived from the TLS application and from the high resolution 3-D model detected with the photogrammetry. Starting from the 3-D reconstruction from previous techniques, an acoustic tomography in a sector of prior interest of the investigated architectural element was planned and carried out. The ultrasonic tomography proved to be an effective tool for detecting internal decay or defects, locating the position of the anomalies and estimating their sizes, shapes, and characteristics in terms of elastic-mechanical properties. Finally, the combination of geophysical and petrographical data sets represents a powerful method for understanding the quality of the building stone materials in the shallow and inner parts of the investigated architectural structures.
27
Jaganathan, Sudhakar, Hooman V. Tafreshi, and Behnam Pourdeyhimi. "Two-Scale Modeling Approach to Predict Permeability of Fibrous Media." Journal of Engineered Fibers and Fabrics 3, no. 2 (June 2008): 155892500800300. http://dx.doi.org/10.1177/155892500800300208.
Full textAbstract:
We previously demonstrated how one can develop a 3–D geometry to model the fibrous microstructure of a nonwoven fiberweb and use it to simulate its permeability at fiber level [1–6]. Developing 3–D models of most nonwoven fabrics (bonded fiberwebs), however, is cumbersome, as in the case of hydroentangled fabrics, for instance. In such cases, microscopic techniques are often used to generate 3–D images of the media's microstructures. Nevertheless, whether the microstructure is modeled or obtained from 3–D imaging, extensive computational resources are required to use them in fluid flow simulations [7]. To circumvent this problem, a two-scale modeling approach is proposed here that allows us to simulate the entire thickness of a commercial fabric/filter on a personal computer. In particular, the microscale permeability of a hydroentangled nonwoven is computed using 3–D reconstructed microstructures obtained from Digital Volumetric Imaging (DVI). The resulting microstructural permeability tensors are then used in a macroscale porous model to simulate the flow through the material's thickness and the calculation of its overall permeability.
28
Furumura, Takashi, B. L. N. Kennett, and Hiroshi Takenaka. "Parallel 3-D pseudospectral simulation of seismic wave propagation." GEOPHYSICS 63, no. 1 (January 1998): 279–88. http://dx.doi.org/10.1190/1.1444322.
Full textAbstract:
Three‐dimensional pseudospectral modeling for a realistic scale problem is still computationally very intensive, even when using current powerful computers. To overcome this, we have developed a parallel pseudospectral code for calculating the 3-D wavefield by concurrent use of a number of processors. The parallel algorithm is based on a partition of the computational domain, where the field quantities are distributed over a number of processors and the calculation is concurrently done in each subdomain with interprocessor communications. Experimental performance tests using three different styles of parallel computers achieved a fairly good speed up compared with conventional computation on a single processor: maximum speed‐up rate of 26 using 32 processors of a Thinking Machine CM-5 parallel computer, 1.6 using a Digital Equipment DEC‐Alpha two‐CPU workstation, and 4.6 using a cluster of eight Sun Microsystems SPARC-Station 10 (SPARC-10) workstations connected by an Ethernet. The result of this test agrees well with the performance theoretically predicted for each system. To demonstrate the feasibility of our parallel algorithm, we show three examples: 3-D acoustic and elastic modeling of fault‐zone trapped waves and the calculation of elastic wave propagation in a 3-D syncline model.
29
Wirawan, Arif Wahyu, C. Dyah Sulistyaningrum Indrawati, and Andre Novie Rahmanto. "Pengembangan media pembelajaran kearsipan digital untuk meningkatkan hasil belajar siswa SMK Negeri 3 Surakarta." Jurnal Pendidikan Vokasi 7, no. 1 (February 28, 2017): 78. http://dx.doi.org/10.21831/jpv.v7i1.12879.
Full textAbstract:
Penelitian ini bertujuan untuk mengetahui kefektifan media pembelajaran kearsipan digital dalam meningkatkan hasil belajar siswa SMK Negeri 3 Surakarta. Penelitian ini merupakan penelitian dan pengembangan (R & D). Model pengembangan media ini menggunakan model Hannafin dan Peck. Subyek pengujian dilakukan di dua kelas, yaitu kelas X AP 1 (kelas eksperimen) dan X AP 2 (kelas kontrol) di SMK Negeri 3 Surakarta. Uji prasyarat analisis meliputi uji normalitas, uji homogenitas dan menggunakan uji-t. Teknik analisis yang digunakan deskriptif kualitatif dan kuantitatif. Hasil penelitian menunjukkan bahwa keefektifan dari media pembelajaran kearsipan digital bahwa thitung> ttabel = (3,26> 2,00), maka H0 ditolak, itu berarti bahwa kedua kelompok memiliki skor prestasi belajar yang berbeda. Hasil posttest antara kelas eksperimen (menggunakan media yang dikembangkan) dengan kelas kontrol (tidak menggunakan media yang dikembangkan) menunjukkan bahwa nilai rata-rata yang diperoleh kelas eksperimen adalah 80,59, nilai rata-rata lebih tinggi dari kelas kontrol 77, 97. Kesimpulan dari penelitian ini adalah pengembangan media pembelajaran kearsipan digital dianggap efektif dalam meningkatkan hasil belajar siswa SMK Negeri 3 Surakarta.Kata kunci: kearsipan, media pembelajaran, microsoft access THE DEVELOPMENT OF LEARNING MEDIA ARCHIVES TO IMPROVE STUDENT LEARNING OUTCOMES SMK NEGERI 3 SURAKARTAAbstractThis study aims to determine the effectiveness of instructional media digital archives in improving student learning outcomes SMK Negeri 3 Surakarta. This study is a research and development (R & D). Models using the model of media development Hannafin and Peck. Subjects testing was conducted in two classes, X AP 1 (experimental class) and X AP 2 (control group) at SMK Negeri 3 Surakarta. Prerequisite test analysis covering the normality test, homogeneity and using t-test. The analysis technique used descriptive qualitative and quantitative. The results showed that the effectiveness of digital archival media learning that tcount> ttable = (3.26> 2.00), then H0 is rejected, it means that the two groups had different learning achievement scores. Results posttest between the experimental class (using the media developed) with a control class (do not use the media developed) shows that the average value obtained experimental class is 80.59, the average value is higher than the control class 77, 97. Conclusion this research is the development of instructional media digital archives are considered effective in improving student learning outcomes SMK Negeri 3 Surakarta.Keywords: archives, learning media, microsoft access
30
Ye, Yong, and Liang Kang. "Discrete Element Numerical Analysis and Experimental Study of Forces in Grinding of Granite." Applied Mechanics and Materials 437 (October 2013): 241–44. http://dx.doi.org/10.4028/www.scientific.net/amm.437.241.
Full textAbstract:
Grinding test was carried out to study the grinding of granite with single diamond grain. Forces were measured to investigate the mean normal and tangential forces acted on the diamond grain. The relationship between the forces and either spindle speed or the maximum thickness of the undeformed chip produced by a diamond grain was discussed. The digital models of granite were constructed by discrete element method. Based on the model, two-dimensional and 3-D analysis was carried out to simulate the grinding process with the single diamond grain. The simulation results were compared with experimental data, and some useful conclusions were obtained: the 3-D results agree well with the experiment data at the sameand largeas well as the sameand large; the 3-D and 2-D results are comparable to the experiment data at other machining parameters..
31
Lian, X., W. Yuan, Z. Guo, Z. Cai, X. Song, and R. Shibasaki. "END-TO-END BUILDING CHANGE DETECTION MODEL IN AERIAL IMAGERY AND DIGITAL SURFACE MODEL BASED ON NEURAL NETWORKS." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B2-2020 (August 14, 2020): 1239–46. http://dx.doi.org/10.5194/isprs-archives-xliii-b2-2020-1239-2020.
Full textAbstract:
Abstract. Multi-temporal building change detection is one of the most essential major issues of photogrammetry and remote sensing at current stage, which is of great significance for wide applications as offering real estate indicators as well as monitoring urban environment. Although current photogrammetry methodologies could be applicated to 2-D remote sensing imagery for rectification with sensor parameters, multi-temporal aerial or satellite imagery is not adequate to offer spectral and textual features for building change detection. Alongside recent development of Dense Image Matching (DIM) technology, the acquisition of 3-D point cloud and Digital Surface Model (DSM) has been generally realized, which could be combined with imagery, making building change detection more effective with greater spatial structure and texture information. Over the past years, scholars have put forward vast change detection techniques including traditional and model-based solutions. Nevertheless, existing appropriate methodology combined with Neural Networks (NN) for accurate building change detection with multi-temporal imagery and DSM remains to be of great research focus currently due to the inevitable limitations and omissions of existing NN-based methods, which is of great research prospect. This study proposed a novel end-to-end model framework based on deep learning for pixel-level building change detection from high-spatial resolution aerial ortho imagery and corresponding DSM sharing same resolution, which is from the dataset of Tokyo whole area.
32
Guan, H., Y. Yu, D. Li, and J. Li. "AUTOMATIC TRAFFIC SIGN DETECTION AND RECOGNITION USING MOBILE LIDAR DATA WITH DIGITAL IMAGES." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLIII-B3-2020 (August 21, 2020): 599–603. http://dx.doi.org/10.5194/isprs-archives-xliii-b3-2020-599-2020.
Full textAbstract:
Abstract. This paper presents a traffic sign detection and recognition method from mobile LiDAR data and digital images for intelligent transportation-related applications. The traffic sign detection and recognition method includes two steps: traffic sign interest regions are first extracted from mobile LiDRA data. Next, traffic signs are identified from digital images simultaneously collected from the multi-sensor mobile LiDAR systems via a convolutional capsule network model. The experimental results demonstrate that the proposed method obtains a promising, reliable, and high performance in both detecting traffic signs in 3-D point clouds and recognizing traffic signs on 2-D images.
33
Passalacqua, Olivier, Olivier Gagliardini, Frédéric Parrenin, Joe Todd, Fabien Gillet-Chaulet, and Catherine Ritz. "Performance and applicability of a 2.5-D ice-flow model in the vicinity of a dome." Geoscientific Model Development 9, no. 7 (July 6, 2016): 2301–13. http://dx.doi.org/10.5194/gmd-9-2301-2016.
Full textAbstract:
Abstract. Three-dimensional ice flow modelling requires a large number of computing resources and observation data, such that 2-D simulations are often preferable. However, when there is significant lateral divergence, this must be accounted for (2.5-D models), and a flow tube is considered (volume between two horizontal flowlines). In the absence of velocity observations, this flow tube can be derived assuming that the flowlines follow the steepest slope of the surface, under a few flow assumptions. This method typically consists of scanning a digital elevation model (DEM) with a moving window and computing the curvature at the centre of this window. The ability of the 2.5-D models to account properly for a 3-D state of strain and stress has not clearly been established, nor their sensitivity to the size of the scanning window and to the geometry of the ice surface, for example in the cases of sharp ridges. Here, we study the applicability of a 2.5-D ice flow model around a dome, typical of the East Antarctic plateau conditions. A twin experiment is carried out, comparing 3-D and 2.5-D computed velocities, on three dome geometries, for several scanning windows and thermal conditions. The chosen scanning window used to evaluate the ice surface curvature should be comparable to the typical radius of this curvature. For isothermal ice, the error made by the 2.5-D model is in the range 0–10 % for weakly diverging flows, but is 2 or 3 times higher for highly diverging flows and could lead to a non-physical ice surface at the dome. For non-isothermal ice, assuming a linear temperature profile, the presence of a sharp ridge makes the 2.5-D velocity field unrealistic. In such cases, the basal ice is warmer and more easily laterally strained than the upper one, the walls of the flow tube are not vertical, and the assumptions of the 2.5-D model are no longer valid.
34
Benvenuti, Lucia, Salvatore Chibbaro, Stefano Carnesecchi, Flavio Pulerà, and Rolando Gagliardi. "Automated Three-dimensional Volume Rendering of Helical Computed Tomographic Angiography for Aneurysms: An Advanced Application of Neuronavigation Technology." Operative Neurosurgery 57, suppl_1 (July 1, 2005): 69–77. http://dx.doi.org/10.1227/01.neu.0000163485.56639.7e.
Full textAbstract:
Abstract OBJECTIVE: To introduce the possibility of volume-rendered helical computed tomographic (CT) angiographic data sets by use of Medtronic StealthStation Treon surgical navigation technology (Medtronic Surgical Navigation Technologies, Louisville, CO) and to evaluate the clinical usefulness of the method in planning and performing surgical treatment of intracranial aneurysms. METHODS: Between November 2002 and July 2003, we studied 15 patients with suspected intracranial aneurysms. All patients but two received conventional digital subtraction angiography, which failed to provide the requested information. Helical CT angiography was performed in all patients, and data sets were transferred to the StealthStation system across an electronic network to be automatically postprocessed by use of three-dimensional (3-D) volume rendering. The 3-D volume-rendered images were accurately analyzed to obtain more complete information about the aneurysm and to provide accurate treatment planning. In all patients, the 3-D volume-rendered model was displayed on the screen of the StealthStation system for the duration of the surgical procedure and compared with the intraoperative image. RESULTS: Data sets from CT angiography were automatically postprocessed by the StealthStation in seconds with excellent results, providing us, before and during surgery, with additional information not always available on traditional digital subtraction angiographic investigation. Because of the very short time necessary to complete this process (<5 min to obtain 3-D volume-rendered images), it was possible to perform emergency clipping of the aneurysms in two patients who had been admitted in very compromised neurological conditions. In 12 patients, integrated digital subtraction angiography and automated 3-D volume-rendered images allowed an accurate presurgical evaluation. Furthermore, in all patients on whom surgery was performed, aneurysms were found in the exact location and with the same anatomic features as depicted by the 3-D volume-rendered models. CONCLUSION: Reports in the literature indicate that information gathered by CT angiography with volume rendering shows a significant impact on aneurysm management. The StealthStation system upgraded with the adequate algorithm seems to provide a time- and cost-effective method of performing automated 3-D volume rendering of CT angiography and provides an interesting alternative to the available investigation modalities in case of emergency.
35
Protic, Dragutin, Milan Kilibarda, Marina Nenkovic-Riznic, and Ivan Nestorov. "Three-dimensional urban solar potential maps: Case study of the i-Scope Project." Thermal Science 22, no. 1 Part B (2018): 663–73. http://dx.doi.org/10.2298/tsci170715213p.
Full textAbstract:
Solar maps as web cartographic products that provide information on solar potential of surfaces on the Earth have been exploited in decision making, awareness raising, and promoting the use of solar energy. Web based solar maps of cities have become popular services as the use of solar energy is especially attractive in urban environments. The article discusses the concept and aspects of urban solar potential maps on the example of the i-Scope project as a case study. The i-Scope roof solar potential service built on 3-D urban information models was piloted in eight European cities. To obtain precise data on solar irradiation, a good quality digital surface model is required. A cost efficient innovative method for generation of digital surface model from stereophotogrammetry for urban areas where no advanced source data (e. g. LiDAR) exist is developed. The method works for flat, shed and gable roofs and provides sufficient accuracy of digital surface model .
36
Sturzenegger, M., and D. Stead. "Quantifying discontinuity orientation and persistence on high mountain rock slopes and large landslides using terrestrial remote sensing techniques." Natural Hazards and Earth System Sciences 9, no. 2 (March 3, 2009): 267–87. http://dx.doi.org/10.5194/nhess-9-267-2009.
Full textAbstract:
Abstract. This paper describes experience gained in the application of terrestrial digital photogrammetry and terrestrial laser scanning for the characterization of the structure of high mountain rock slopes and large landslides. A methodology allowing the creation and registration of 3-D models with limited access to high mountain rock slopes is developed and its accuracy verified. The importance of occlusion, ground resolution, scale and reflectivity are discussed. Special emphasis is given to the concept of observation scale and resulting scale bias and its influence on discontinuity characterization. The step-path geometry of persistent composite surfaces and its role in remote sensing measurements are described. An example of combined terrestrial digital photogrammetry and terrestrial laser scanning applied in the generation of a 3-D model of the South Peak of Turtle Mountain, the location of the Frank Slide, is presented. The advantages gained from the combined use of these techniques and the potential offered through long-range terrestrial digital photogrammetry, using high focal length lenses up to 400 mm is illustrated. Special emphasis is given to the potential of this specific technique, which has to the authors knowledge rarely been documented in the geotechnical literature.
37
Muhsin, Israa Jameel. "High spatial resolution digital elevation model (DEM) production using different interpolations techniques." Iraqi Journal of Physics (IJP) 11, no. 21 (February 24, 2019): 116–26. http://dx.doi.org/10.30723/ijp.v11i21.375.
Full textAbstract:
DEMs, thus, simply regular grids of elevation measurements over the land surface.The aim of the present work is to produce high resolution DEM for certain investigated region (i.e. Baghdad University Campus\ college of science). The easting and northing of 90 locations, including the ground-base and buildings of the studied area, have been obtained by field survey using global positioning system (GPS). The image of the investigated area has been extracted from Quick-Bird satellite sensor (with spatial resolution of 0.6 m). It has been geo-referenced and rectified using 1st order polynomial transformation. many interpolation methods have been used to estimate the elevation such as ordinary Kriging, inverse distance weighted (IDW) and natural neighbor methods. The mosaic algorithm has then been applied between the base and building layers of studied area in order to perform the final DEM. The accuracy assessments of the interpolation methods have been calculated using the root-mean-square-error (RMSE) criterion. Finally, the estimated DEMs have been used to constructing 3-D views of the original image.
38
Styliadis, Athanasios D., Debbie G. Konstantinidou, and Kyriaki A. Tyxola. "eCAD System Design - Applications in Architecture." International Journal of Computers Communications & Control 3, no. 2 (January 1, 2008): 204. http://dx.doi.org/10.15837/ijccc.2008.2.2388.
Full textAbstract:
The rapid advances in learning technologies, computer modeling, multimedia and spatial sciences, as well as the availability of many powerful graphics PCs and workstations, make 3-D modeling-based methods for personalized e-learning with eCAD (modeling) functionality feasible. Personalized eCAD learning is a new term in engineering, environment and architecture education, related to the development of learning educational units (3-D learning objects) with re-usable digital architecture functionality, and introduced to literature for the first time within this paper. In particular, for university education courses in eCAD, digital architecture, design computing and CAAD (reagarding spatial information systems, architectures, monuments, cultural heritage sites, etc.), such a e-learning methodolgy must be able to derive spatial, pictorial, geometric, spatial, topological, learning and semantic information from the target object (a 3-D model) or scene (a 3-D landscape environment) or procedure (a 3-D simulation approach to a phenomenon), in such a way that it can be directly used for e-learning purposes regarding the spatial topology, the history, the architecture, the structure and the temporal (time-based) 3-D geometry of the projected object, scene or procedure. This paper is about the system design of such a e-learning method. For this purpose, the requirements, objectives and pedagogical extensions are presented and discussed. Finaly, a practical project is used to demonstrate the functionality and the performance of the proposed methodology in architecture
39
Zhu, W. S., Q. B. Zhang, H. H. Zhu, Y. Li, J. H. Yin, S. C. Li, L. F. Sun, and L. Zhang. "Large-scale geomechanical model testing of an underground cavern group in a true three-dimensional (3-D) stress state." Canadian Geotechnical Journal 47, no. 9 (September 2010): 935–46. http://dx.doi.org/10.1139/t10-006.
Full textAbstract:
The stability of a large cavern group at great depth is discussed on the basis of large-scale three-dimensional (3-D) geomechanical model tests and numerical simulations. The model tests are described in detail. Improvements in the tests were made in terms of experimental techniques and advanced measurement methods. The model tests utilized active loading on six sides of a rock mass in a true 3-D stress state. During the model construction, precast blocks were fabricated and monitoring holes were defined prior to test initiation. Newly developed combination ball-sliding walls were installed on each of the major loading surfaces to reduce the friction induced by model deformation. A unique grouting and installation technique employing prestressed cables was adopted in the tests. A digital photogrammetric technique, displacement sensing bars using fiber Bragg grating (FBG) technology, and mini multipoint extensometers were developed for measuring deformation. Overloading tests were then conducted for different overburden depths, and 3-D numerical analyses were performed to simulate the testing procedures. Conclusions regarding the stability of the cavern group were developed based on a comparison between the experimental and numerical results.
40
Wang, Tao, Yi Liu Liu, Li Wen Wang, Hao Wang, and Jie Tang. "Digitally Reverse Modeling for the Repair of Blades in Aero-Engines." Applied Mechanics and Materials 141 (November 2011): 258–63. http://dx.doi.org/10.4028/www.scientific.net/amm.141.258.
Full textAbstract:
Blades are key components in aircraft engines, and flight safety is directly impacted by the repair quality of blades. Digital modeling for the surfaces of high pressure blades is conducted in this study based on the cloud data collected with scan. Boundary points of blades are obtained with the method of varied step lengths according to curvature, and then the envelope curves are plotted from the approximation of these boundary points with a third power B spline. 3-D digital models of blades in aero-engines are established with the envelope curves and the condensed data cloud. Results illustrate the smoothness and accuracy of the proposed engine blade repair model.
41
Hernández-Montes, Maria del Socorro, Carlos Pérez-López, and Fernando Mendoza Santoyo. "Finding the position of tumor inhomogeneities in a gel-like model of a human breast using 3-D pulsed digital holography." Journal of Biomedical Optics 12, no. 2 (2007): 024027. http://dx.doi.org/10.1117/1.2717515.
Full text
42
Sarango-Lapo, Celia Paola, Juanjo Mena, and María Soledad Ramírez-Montoya. "Evidence-Based Educational Innovation Model Linked to Digital Information Competence in the Framework of Education 4.0." Sustainability 13, no. 18 (September 8, 2021): 10034. http://dx.doi.org/10.3390/su131810034.
Full textAbstract:
Education 4.0 promotes visualizing how teachers’ traditional digital competencies adopt innovative practices. The present research analyzes the relationship between the perceived digital information competencies (DICs) of university teachers and the implementation of evidence-based, innovative actions (EBEI) in a model that supports innovative practices. The research method applied was the mixed method. In the quantitative phase, the final sample consisted of 271 teachers. The ad hoc digital competency-open educational resource scale (DC-OER) was applied to measure their perception of DIC. In the qualitative phase, 15 teachers were interviewed. The results showed (a) a close relationship between the fulfillment of EBEI and the support of DIC; (b) in quantitative results, in most cases, the means are close to the central value 3, and the standard deviation is close to 1, which indicates higher DIC; (c) the qualitative results indicate that teachers search, select, evaluate information, and produce new knowledge; and (d) the theoretical model of EBEI links DIC to the formation of digital citizenship. The data can be of value to the academic community in relevant environments within the framework of Education 4.0. As a future line of research, we envision analyzing the perceived digital competencies of teachers versus their effective behavior.
43
Usmani, Abdul Rahman Ahsan, Abdalrahman Elshafey, Masoud Gheisari, Changsaar Chai, Eeydzah Binti Aminudin, and Cher Siang Tan. "A scan to as-built building information modeling workflow: a case study in Malaysia." Journal of Engineering, Design and Technology 18, no. 4 (December 5, 2019): 923–40. http://dx.doi.org/10.1108/jedt-07-2019-0182.
Full textAbstract:
Purpose Three dimensional (3 D) laser scanner surveying is widely used in many fields, such as agriculture, mining and heritage documentation and can be of great benefit for as-built documentation in construction and facility management domains. However, there is lack of applied research and use cases integrating 3 D laser scanner surveying with building information modeling (BIM) for existing facilities in Malaysia. This study aims to develop a scan to as-built BIM workflow to use 3 D laser scanner surveying and create as-built building information models of an existing complex facility in Malaysia. Design/methodology/approach A case study approach was followed to develop a scan to as-built BIM workflow through four main steps: 3 D laser scanning, data preprocessing, data registration and building information modeling. Findings This case study proposes a comprehensive scan to as-built BIM workflow which illustrates all the required steps to create a precise 3 D as-built building information model from scans. This workflow was successfully implemented to the Eco-Home facility at the Universiti Teknologi Malaysia. Originality/value Scan to as-built BIM is a digital alternative to manual and tedious process of documentation of as-built condition of a facility and provides a detail process using laser scans to create as-built building information models of facilities.
44
Chen, Xin, and Jun Long Zhou. "Research on Aerodynamic Noise of Base Styling Characteristics of Car Rearview Cover." Advanced Materials Research 490-495 (March 2012): 2987–91. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.2987.
Full textAbstract:
The 3-D digital models are established for two kinds of base styling of rearview cover. The compare analysis using Fluent model is based on the acoustic theory of computation. The results show that the average sound pressure level of up-raised rearview cover model is about 5 dB lower than that down-raised rearview cover model, and in all of the frequency range were apparently different. At the same time, the vortex of down-raised happened at the back location, which is more closer to the passenger’s ear, and affect the car interior noise. The results of analysis will conduct the design of rearview styling effectively.
45
Sefriani, Rini, and Jhon Veri. "Pengembangan Mobile Learning Berbasis Client Server Pada Mata Pelajaran Simulasi Digital." KomtekInfo 5, no. 3 (April 8, 2019): 61–71. http://dx.doi.org/10.29165/komtekinfo.v5i3.194.
Full textAbstract:
Penelitian ini bertujuan untuk mengetahui tingkat Validitas, Praktikalitas dan Efektifitas media pembelajaran Mobile Learning berbasis Client Server di SMK Negeri 9 Padang. Karena masih terbatasnya sumber belajar dan media pembelajaran dalam bentuk multimedia interaktif dengan kemasan mobile learning di SMKN 9 Padang . Penelitian menggunakan model pengembangan (Four-D model). Langkah-langkah pengembangannya adalah (1) Define, (2) Design, (3) Development, dan (4) Disseminate. Instrumen uji coba dilakukan pada 31 siswa di SMK N 9 Padang. Sampel dalaam penelitian in sebanyak 31 orang siswa. Hasil penelitian menunjukkan tingkat validitas diperoleh sebesar 82,17 % dengan interpretasi valid, tingkat praktikalitas sebesar 82,29 % yang berarti praktis digunakan dan untuk tingkat uji efektifitas sebesar 90,03 yang berarti sangat efektif digunakan media pembelajaran Mobile Learning Berbasis Client Server Pada Mata Pelajaran Simulasi Digital di SMKN 9 Padang.
46
Burschil, T., W. Scheer, R. Kirsch, and H. Wiederhold. "Compiling geophysical and geological information into a 3-D model of the glacially-affected island of Föhr." Hydrology and Earth System Sciences 16, no. 10 (October 1, 2012): 3485–98. http://dx.doi.org/10.5194/hess-16-3485-2012.
Full textAbstract:
Abstract. Within the scope of climatic change and associated sea level rise, coastal aquifers are endangered and are becoming more a focus of research to ensure the future water supply in coastal areas. For groundwater modelling a good understanding of the geological/hydrogeological situation and the aquifer behavior is necessary. In preparation of groundwater modelling and assessment of climate change impacts on coastal water resources, we setup a geological/hydrogeological model for the North Sea Island of Föhr. Data from different geophysical methods applied from the air, the surface and in boreholes contribute to the 3-D model, e.g. airborne electromagnetics (SkyTEM) for spatial mapping the resistivity of the entire island, seismic reflections for detailed cross-sections in the groundwater catchment area, and geophysical borehole logging for calibration of these measurements. An iterative and integrated evaluation of the results from the different geophysical methods contributes to reliable data as input for the 3-D model covering the whole island and not just the well fields. The complex subsurface structure of the island is revealed. The local waterworks use a freshwater body embedded in saline groundwater. Several glaciations reordered the youngest Tertiary and Quaternary sediments by glaciotectonic thrust faulting, as well as incision and refill of glacial valleys. Both subsurface structures have a strong impact on the distribution of freshwater-bearing aquifers. A digital geological 3-D model reproduces the hydrogeological structure of the island as a base for a groundwater model. In the course of the data interpretation, we deliver a basis for rock identification. We demonstrate that geophysical investigation provide petrophysical parameters and improve the understanding of the subsurface and the groundwater system. The main benefit of our work is that the successful combination of electromagnetic, seismic and borehole data reveals the complex geology of a glacially-affected island. A sound understanding of the subsurface structure and the compilation of a 3-D model is imperative and the basis for a groundwater flow model to predict climate change effects on future water resources.
47
Shi, Jian Ming, Dong Zhou, Jie Geng, and Chuan Lv. "Research on Flexible Cables Simulation Based on CATIA/DELMIA." Applied Mechanics and Materials 26-28 (June 2010): 800–804. http://dx.doi.org/10.4028/www.scientific.net/amm.26-28.800.
Full textAbstract:
Digital design and assembly of cables is a most important and difficult problem in mechanical industry. The paper solved the problem through the CAD/CAE software. Firstly, 3-D model of electrical bundle was built in the digital mock-up. The model reflected the parameters of the bundle exactly. After the design of cables, the simulation of cable moving was developed. The flexible feature of cable was displayed in the animation. It was an exciting achievement of this article, which can be used in the virtual assembly of cables to detect design problems. Besides the maintenance process containing cable plug and pull was simulated. The ergonomics was then tested in the form of virtual maintenance.
48
Klin, Peter, Giovanna Laurenzano, Maria Adelaide Romano, Enrico Priolo, and Luca Martelli. "ER3D: a structural and geophysical 3-D model of central Emilia-Romagna (northern Italy) for numerical simulation of earthquake ground motion." Solid Earth 10, no. 3 (June 25, 2019): 931–49. http://dx.doi.org/10.5194/se-10-931-2019.
Full textAbstract:
Abstract. During the 2012 seismic sequence of the Emilia region (northern Italy), the earthquake ground motion in the epicentral area featured longer duration and higher velocity than those estimated by empirical-based prediction equations typically adopted in Italy. In order to explain these anomalies, we (1) build up a structural and geophysical 3-D digital model of the crustal sector involved in the sequence, (2) reproduce the earthquake ground motion at some seismological stations through physics-based numerical simulations and (3) compare the observed recordings with the simulated ones. In this way, we investigate how the earthquake ground motion in the epicentral area is influenced by local stratigraphy and geological structure buried under the Po Plain alluvium. Our study area covers approximately 5000 km2 and extends from the right Po River bank to the Northern Apennine morphological margin in the N–S direction, and between the two chief towns of Reggio Emilia and Ferrara in the W–E direction, involving a crustal volume of 20 km thickness. We set up the 3-D model by using already-published geological and geophysical data, with details corresponding to a map at scale of 1:250 000. The model depicts the stratigraphic and tectonic relationships of the main geological formations, the known faults and the spatial pattern of the seismic properties. Being a digital vector structure, the 3-D model can be easily modified or refined locally for future improvements or applications. We exploit high-performance computing to perform numerical simulations of the seismic wave propagation in the frequency range up to 2 Hz. In order to get rid of the finite source effects and validate the model response, we choose to reproduce the ground motion related to two moderate-size aftershocks of the 2012 Emilia sequence that were recorded by a large number of stations. The obtained solutions compare very well to the recordings available at about 30 stations in terms of peak ground velocity and signal duration. Snapshots of the simulated wavefield allow us to attribute the exceptional length of the observed ground motion to surface wave overtones that are excited in the alluvial basin by the buried ridge of the Mirandola anticline. Physics-based simulations using realistic 3-D geomodels show eventually to be effective for assessing the local seismic response and the seismic hazard in geologically complex areas.
49
D’Affonseca, Fernando M., Michael Finkel, and Olaf A. Cirpka. "Combining implicit geological modeling, field surveys, and hydrogeological modeling to describe groundwater flow in a karst aquifer." Hydrogeology Journal 28, no. 8 (September 15, 2020): 2779–802. http://dx.doi.org/10.1007/s10040-020-02220-z.
Full textAbstract:
AbstractIn three-dimensional (3-D) implicit geological modeling, the bounding surfaces between geological units are automatically constructed from lithological contact data (position and orientation) and the location and orientation of potential faults. This approach was applied to conceptualize a karst aquifer in the Middle Triassic Muschelkalk Formation in southwest Germany, using digital elevation data, geological maps, borehole logs, and geological interpretation. Dip and strike measurements as well as soil-gas surveys of mantel-borne CO2 were conducted to verify the existence of an unmapped fault. Implicit geological modeling allowed the straightforward assessment of the geological framework and rapid updates with incoming data. Simultaneous 3-D visualizations of the sedimentary units, tectonic features, hydraulic heads, and tracer tests provided insights into the karst-system hydraulics and helped guide the formulation of the conceptual hydrogeological model. The 3-D geological model was automatically translated into a numerical single-continuum steady-state groundwater model that was calibrated to match measured hydraulic heads, spring discharge rates, and flow directions observed in tracer tests. This was possible only by introducing discrete karst conduits, which were implemented as high-conductivity features in the numerical model. The numerical groundwater flow model was applied to initially assess the risk from limestone quarrying to local water supply wells with the help of particle tracking.
50
Zhang, Y. K., L. J. Xiao, Pei Si Zhong, and W. Li. "Research on Design of Hydraulic Support Based on Virtual Prototype Technology." Materials Science Forum 697-698 (September 2011): 508–12. http://dx.doi.org/10.4028/www.scientific.net/msf.697-698.508.
Full textAbstract:
According to the design theory and method of complex product based on virtual prototype technology, with design characteristics of the hydraulic support, the system framework of the hydraulic support is established. The three-dimension (3-D) digital model of the hydraulic support virtual prototype conformed to the actual requirement is built. The static and dynamic analyses and simulation to the model are carried out. The research results show that the designed hydraulic support meets its actual work requirements.