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Relevant bibliographies by topics / Accuracy of testing

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Academic literature on the topic 'Accuracy of testing'

Author: Grafiati

Published: 28 June 2021

Last updated: 10 February 2022

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Journal articles on the topic "Accuracy of testing"

1

Lenart, Andrzej S. "ARPA Accuracy Testing." Journal of Navigation 42, no. 1 (January 1989): 117–23. http://dx.doi.org/10.1017/s0373463300015137.

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In this paper, methods and formulas for testing ARPA (Automatic Radar Plotting Aid) equipment according to IMO requirements are developed. The International Maritime Organization (IMO) and International Electrotechnical Commission (IEC) requirements for tracking accuracy are also discussed.

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Koch, David D. "Testing Cholesterol Accuracy." JAMA 260, no. 17 (November 4, 1988): 2552. http://dx.doi.org/10.1001/jama.1988.03410170100043.

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Kruck, S. E. "Testing spreadsheet accuracy theory." Information and Software Technology 48, no. 3 (March 2006): 204–13. http://dx.doi.org/10.1016/j.infsof.2005.04.005.

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Nash, Murray, Michael Anstis, and Michael Bradbury. "Testing Corporate Model Prediction Accuracy." Australian Journal of Management 14, no. 2 (December 1989): 211–21. http://dx.doi.org/10.1177/031289628901400205.

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Kelly, Thomas A. "Accuracy Key to Testing Meters." Opflow 27, no. 8 (August 2001): 1–7. http://dx.doi.org/10.1002/j.1551-8701.2001.tb01608.x.

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Cooper, Michael A., and Andrew D. M. McLeod. "The Accuracy of Coagulation Testing." Anesthesia & Analgesia 94, no. 5 (May 2002): 1373–74. http://dx.doi.org/10.1097/00000539-200205000-00078.

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Horlocker, Terese T., and Gregory A. Nuttall. "The Accuracy of Coagulation Testing." Anesthesia & Analgesia 94, no. 5 (May 2002): 1374. http://dx.doi.org/10.1097/00000539-200205000-00079.

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Hwang, Jiunn Tzon, George Casella, Christian Robert, Martin T. Wells, and Roger H. Farrell. "Estimation of Accuracy in Testing." Annals of Statistics 20, no. 1 (March 1992): 490–509. http://dx.doi.org/10.1214/aos/1176348534.

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Hijano, Rafael, Joan Fuste, and Joan Fontane-Ventura. "Diagnostic Accuracy of Otoneurology Testing." Otolaryngology–Head and Neck Surgery 147, no. 2_suppl (August 2012): P204. http://dx.doi.org/10.1177/0194599812451426a250.

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W., M. D. "Electrophoresis Improves Accuracy of Raternity Testing." Analytical Chemistry 57, no. 4 (April 1985): 532A—534A. http://dx.doi.org/10.1021/ac00281a743.

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Dissertations / Theses on the topic "Accuracy of testing"

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Novela, George. "Testing maquiladora forecast accuracy." To access this resource online via ProQuest Dissertations and Theses @ UTEP, 2008. http://0-proquest.umi.com.lib.utep.edu/login?COPT=REJTPTU0YmImSU5UPTAmVkVSPTI=&clientId=2515.

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Ahmed, Anwar. "COST AND ACCURACY COMPARISONS IN MEDICAL TESTING USING SEQUENTIAL TESTING STRATEGIES." VCU Scholars Compass, 2010. http://scholarscompass.vcu.edu/etd/103.

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The practice of sequential testing is followed by the evaluation of accuracy, but often not by the evaluation of cost. This research described and compared three sequential testing strategies: believe the negative (BN), believe the positive (BP) and believe the extreme (BE), the latter being a less-examined strategy. All three strategies were used to combine results of two medical tests to diagnose a disease or medical condition. Descriptions of these strategies were provided in terms of accuracy (using the maximum receiver operating curve or MROC) and cost of testing (defined as the proportion of subjects who need 2 tests to diagnose disease), with the goal to minimize the number of tests needed for each subject while maintaining test accuracy. It was shown that the cost of the test sequence could be reduced without sacrificing accuracy beyond an acceptable range by setting an acceptable tolerance (q) on maximum test sensitivity. This research introduced a newly-developed ROC curve reflecting this reduced sensitivity and cost of testing called the Minimum Cost Maximum Receiver Operating Characteristic (MCMROC) curve. Within these strategies, four different parameters that could influence the performance of the combined tests were examined: the area under the curve (AUC) of each individual test, the ratio of standard deviations (b) from assumed underlying disease and non-disease populations, correlation (rho) between underlying disease populations, and disease prevalence. The following patterns were noted: Under all parameter settings, the MROC curve of the BE strategy never performed worse than the BN and BP strategies, and it most frequently had the lowest cost. The parameters tended to have less of an effect on the MROC and MCMROC curves than they had on the cost curves, which were affected greatly. The AUC values and the ratio of standard deviations both had a greater effect on cost curves, MROC curves, and MCMROC curves than prevalence and correlation. The use of BMI and plasma glucose concentration to diagnose diabetes in Pima Indians was presented as an example of a real-world application of these strategies. It was found that the BN and BE strategies were the most consistently accurate and least expensive choice.

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Ashton, Triss A. "Accuracy and Interpretability Testing of Text Mining Methods." Thesis, University of North Texas, 2013. https://digital.library.unt.edu/ark:/67531/metadc283791/.

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Extracting meaningful information from large collections of text data is problematic because of the sheer size of the database. However, automated analytic methods capable of processing such data have emerged. These methods, collectively called text mining first began to appear in 1988. A number of additional text mining methods quickly developed in independent research silos with each based on unique mathematical algorithms. How good each of these methods are at analyzing text is unclear. Method development typically evolves from some research silo centric requirement with the success of the method measured by a custom requirement-based metric. Results of the new method are then compared to another method that was similarly developed. The proposed research introduces an experimentally designed testing method to text mining that eliminates research silo bias and simultaneously evaluates methods from all of the major context-region text mining method families. The proposed research method follows a random block factorial design with two treatments consisting of three and five levels (RBF-35) with repeated measures. Contribution of the research is threefold. First, the users perceived a difference in the effectiveness of the various methods. Second, while still not clear, there are characteristics with in the text collection that affect the algorithms ability to extract meaningful results. Third, this research develops an experimental design process for testing the algorithms that is adaptable into other areas of software development and algorithm testing. This design eliminates the bias based practices historically employed by algorithm developers.

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Davison, Wayne. "Establishment of Accuracy Testing Facilities for Terrestrial Laser Scanners." Master's thesis, University of Cape Town, 2018. http://hdl.handle.net/11427/29572.

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Measurement instruments that are required for high precision and reliable work need to have regular checks to ensure they are always performing at the required level of accuracy. A Terrestrial Laser Scanner is one such instrument and with the vast amount of information that this machine is able to capture, it is especially important to run regular accuracy checks. This research is building on the work that has been done by previous researchers on the assessment of instrument accuracy and the establishment of facilities specialized for this assessment. Theoretical principles are investigated in the form of Least Squares Adjustments, similarities to panorama photography and photogrammetric accuracy. Terrestrial Laser Scanners are reviewed with respect to their scanning principles and data acquisition. The methodology incorporated in this research encompasses the positioning of targets, their survey to establish high accuracy coordinates through various methods of adjustment and thereafter the scanning of those targets. Comparisons were done using derived angles and distances between the targets to discover the point accuracy of the Laser Scanner. This was done for two facilities; a short range facility (1 to 15 meters) and a medium range facility (1 to 75 meters). The medium range facility also included a range testing baseline for distance accuracy assessments. The outcomes from the comparisons between the surveyed control data and the laser scanner observed data indicated that the laser scanner is performing below the accuracy of the surveyed data. The laser scanner was further compared against the manufacturer quoted performance specifications and revealed the laser scanner to be performing below the quoted values. The laser scanner in question showed stronger results in the horizontal measurements over the vertical measurements. All results suggested the laser scanner was delivering weak results in the vertical observations due to a mis-alignment of individual scan halves. This research was able to establish two accuracy assessment facilities specialized for Terrestrial Laser Scanners under these same conditions. Both facilities were used in conjunction, to analyze the Z+F Imager 5010C laser scanner and determine the point accuracy in terms of the observed angles and distances from this machine. The results are also able to identify errors in the performance of the laser scanner and whether or not it is performing within the manufacturer specifications by noticing any large values such as in the case of the vertical observations for this instrument.

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Wu, Chen. "Testing the predictive accuracy of possibly misspecified binary choice models /." Full text available from ProQuest UM Digital Dissertations, 2008. http://0-proquest.umi.com.umiss.lib.olemiss.edu/pqdweb?index=0&did=1850449331&SrchMode=1&sid=2&Fmt=2&VInst=PROD&VType=PQD&RQT=309&VName=PQD&TS=1279224700&clientId=22256.

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Thesis (Ph.D.)--University of Mississippi, 2008.
Typescript. Vita. "April 2008." Major professor: Walter Mayer Includes bibliographical references (leaves 68-71). Also available online via ProQuest to authorized users.

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Gillett, Simon D. "Accuracy in mechanistic pavement design consequent upon unbound material testing." Thesis, University of Nottingham, 2002. http://eprints.nottingham.ac.uk/12226/.

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As part of a European Union funded research study (the "SCIENCE" project) performed between 1990 and 1993, granular road construction material and subgrade soil specimens were tested in the four participating laboratories of the project: Laboratório Nacional de Engenharia Civil Portugal University of Nottingham United Kingdom Laboratoire Central des Ponts et Chaussées France Delft University of Technology The Netherlands The author was based the first of these and visited the other participating laboratories, performing the majority of the work described. Inaccuracies in repeated load triaxial testing based on the use of different apparatus and instrumentation are identified. A detailed instrumentation comparison is undertaken, which results in the magnitude of potential errors being quantified. The author has derived material parameters and model coefficients for the materials tested using a number of previously published material models. In order to establish these parameters a method for removing outliers from test data based on the difference between the modelled and experimental material parameters for each stress path applied was developed. The consequences of repeatability and reproducibility, variability and inaccuracies in the output of repeated load triaxial testing, on the parameters and, hence, on computed pavement design thicknesses or life is investigated using a number of material models and the South African mechanistic pavement design method. Overall, it is concluded that: • Instrumentation differences are not as critical as variations in results obtained from different specimens tested in a single repeated load triaxial apparatus. It was found that specimen manufacture difference yielded greater variation that instrumentation differences. • Variation in results has some effect on the upper granular layers, where higher stress levels are experienced, but even quite considerable variation in the results from materials used in the lower layers has little effect on pavement life. • Analytical methods to determine the stresses and strains vary considerably as do the predicted pavement thicknesses consequent on using these methods. The inaccuracies in testing (large discrepancies are found when the same material is tested in the same laboratory) and the limitations of the available material models severely limit the usefulness of advanced testing and non-linear modelling in routine pavement design. On the basis of this study it is recommended that a more simplistic pavement design approach be taken keeping in line with future developments of testing and modelling and field validation.

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Vasudev, R. Sashin, and Ashok Reddy Vanga. "Accuracy of Software Reliability Prediction from Different Approaches." Thesis, Blekinge Tekniska Högskola, Avdelningen för för interaktion och systemdesign, 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-1298.

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Many models have been proposed for software reliability prediction, but none of these models could capture a necessary amount of software characteristic. We have proposed a mixed approach using both analytical and data driven models for finding the accuracy in reliability prediction involving case study. This report includes qualitative research strategy. Data is collected from the case study conducted on three different companies. Based on the case study an analysis will be made on the approaches used by the companies and also by using some other data related to the organizations Software Quality Assurance (SQA) team. Out of the three organizations, the first two organizations used for the case study are working on reliability prediction and the third company is a growing company developing a product with less focus on quality. Data collection was by the means of interviewing an employee of the organization who leads a team and is in the managing position for at least last 2 years.
svra06@student.bth.se

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Almowanes, Abdullah. "GENERATING RANDOM SHAPES FOR MONTE CARLO ACCURACY TESTING OF PAIRWISE COMPARISONS." Thesis, Laurentian University of Sudbury, 2013. https://zone.biblio.laurentian.ca/dspace/handle/10219/2097.

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This thesis shows highly encouraging results as the gain of accuracy reached 18.4% when the pairwise comparisons method was used instead of the direct method for comparing random shapes. The thesis describes a heuristic for generating random but nice shapes, called placated shapes. Random, but visually nice shapes, are often needed for cognitive experiments and processes. These shapes are produced by applying the Gaussian blur to randomly generated polygons. Afterwards, the threshold is set to transform pixels to black and white from di erent shades of gray. This transformation produces placated shapes for easier estimation of areas. Randomly generated placated shapes are used to perform the Monte Carlo method to test the accuracy of cognitive processes by using pairwise comparisons. An on-line questionnaire has been implemented and participants were asked to estimate the areas of ve shapes using a provided unit of measure. They were also asked to compare the shapes in pairs. Such Monte Carlo experiment has never been conducted for 2D case. The received results are of considerable importance.

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Arnold, Theresa Faye. "TESTING THE ACCURACY OF LIDAR FOREST MEASUREMENT REPLICATIONS IN OPERATIONAL SETTINGS." MSSTATE, 2009. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232009-100909/.

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The repeatability of stand measurements derived from LiDAR data was tested in east-central Mississippi. Data collected from LiDAR missions and from ground plots were analyzed to estimate stand parameters. Two independent LiDAR missions were flown in approximate orthogonal directions. Field plots were generated where the missions overlapped, and tree data were taken in these plots. LiDAR data found 86-100% of mature pine trees, 64-81% of immature pine trees, and 63-72% of mature hardwood trees. Immature and mature pine tree heights measured from LiDAR were found to be significantly different (α= 0.05) than field measured heights. Individual tree volumes and plot volume for mature pines were precisely predicted in both flight directions. The results of this study showed that LiDAR repeatability in mature pines can be accurately achieved. But immature pine and hardwood plots were unable to match the repeatability of the mature pine plots.

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Ogawa, Hiroyuki. "Testing the accuracy of a three-dimensional acoustic coupled mode model." Thesis, Monterey, California. Naval Postgraduate School, 1991. http://hdl.handle.net/10945/26806.

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Books on the topic "Accuracy of testing"

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Vaughn, Harold R. Rifle accuracy facts: A distinguished scientist's lifelong pursuit of the secrets of "extreme rifle accuracy". Manchester, Conn: Precision Shooting, 2000.

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Jywe, W. A computer-aided accuracy testing device for machine tools. Manchester: UMIST, 1992.

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Rauscher, Harold M. The microcomputer scientific software series 4: Testing prediction accuracy. St. Paul, Minn: U.S. Dept. of Agriculture, Forest Service, North Central Forest Experiment Station, 1986.

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Ogawa, Hiroyuki. Testing the accuracy of a three-dimensional acoustic coupled mode model. Monterey, Calif: Naval Postgraduate School, 1991.

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New York (State). Legislature. Senate. Higher Education Committee. Public hearing: Re: truth in testing, investigation, and ensuring accuracy of standardized testing in New York State. New York]: Roy Allen & Associates, 2006.

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Alexander, A. Michel. Accuracy of estimating compressive strength of deteriorated concrete seawall by nondestructive evaluation (NDE). Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1998.

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New York (State). Legislature. Senate. Higher Education Committee. Public hearing on truth in testing: Investigating fairness and ensuring accuracy of standardized testing in New York State. Clifton Park, NY]: Candyco Transcription Service, 2006.

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Wolfe-Quintero, Kate. Second language development in writing: Measures of fluency, accuracy, & complexity. Honolulu, HI: Second Language Teaching & Curriculum Center, University of Hawaii at Manoa, 1998.

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Ebeling, Robert M. Accuracy of response of single-degree-of-freedom systems to ground motion. Vicksburg, Miss: U.S. Army Engineer Waterways Experiment Station, 1997.

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D'Auria, F. RELAP5/MOD3.2 post test analysis and accuracy quantification of Lobi test BL-44. Washington, DC: Office of Nuclear Regulatory Research, U.S. Nuclear Regulatory Commission, 1999.

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Book chapters on the topic "Accuracy of testing"

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Berner, Eta S. "Testing System Accuracy." In Health Informatics, 61–74. New York, NY: Springer New York, 1999. http://dx.doi.org/10.1007/978-1-4757-3903-9_3.

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Strug, Joanna. "Mutation Testing in Model Accuracy Assessment." In Advances in Intelligent Systems and Computing, 201–11. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-46586-9_16.

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Jin, Wei, and Alessandro Orso. "Improving Efficiency and Accuracy of Formula-Based Debugging." In Hardware and Software: Verification and Testing, 99–116. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-49052-6_7.

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Kessler, S., and C. Gehlen. "Accuracy of Potential Mapping Assessed Through Numerical Models." In Nondestructive Testing of Materials and Structures, 711–17. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-0723-8_101.

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Pallotti, Gabriele. "Measuring Complexity, Accuracy, and Fluency (CAF)." In The Routledge Handbook of Second Language Acquisition and Language Testing, 201–10. New York: Routledge, 2020. | Series: The Routledge handbooks in second language acquisition: Routledge, 2020. http://dx.doi.org/10.4324/9781351034784-23.

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Kempf, Arlo. "A Lack of Accountability: Teacher Perspectives on Equity, Accuracy, and Standardized Testing." In The Pedagogy of Standardized Testing, 129–59. New York: Palgrave Macmillan US, 2016. http://dx.doi.org/10.1057/9781137486653_7.

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Brown, Anna. "Item Response Theory Approaches to Test Scoring and Evaluating the Score Accuracy." In The Wiley Handbook of Psychometric Testing, 607–38. Chichester, UK: John Wiley & Sons, Ltd, 2018. http://dx.doi.org/10.1002/9781118489772.ch20.

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Shin, Jihye. "Completing the Triangle of Reading Fluency Assessment: Accuracy, Speed, and Prosody." In Challenges in Language Testing Around the World, 307–16. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-33-4232-3_22.

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Pavelka, Karel, and Jaroslav Šedina. "Creating of DSM Based on RPAS Measurement and Accuracy Testing." In Lecture Notes in Geoinformation and Cartography, 173–88. Cham: Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-18407-4_15.

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Khadem, Rasool, Michael R. Bax, Jeremy A. Johnson, Eric P. Wilkinson, and Ramin Shahidi. "Endoscope Calibration and Accuracy Testing for 3D/2D Image Registration." In Medical Image Computing and Computer-Assisted Intervention – MICCAI 2001, 1361–62. Berlin, Heidelberg: Springer Berlin Heidelberg, 2001. http://dx.doi.org/10.1007/3-540-45468-3_229.

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Conference papers on the topic "Accuracy of testing"

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Gurbiel, M., P. Komarnicki, Z. A. Styczynski, F. W. Gatzen, and C. Dzienis. "Merging unit accuracy testing." In Energy Society General Meeting (PES). IEEE, 2009. http://dx.doi.org/10.1109/pes.2009.5275894.

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Evans, Chris. "Clash of Cultures: Uncertainty vs. Accuracy." In Optical Fabrication and Testing. Washington, D.C.: OSA, 2010. http://dx.doi.org/10.1364/oft.2010.omb3.

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Nerreter, S., R. Grunwald, A. Barwolff, and J. W. Tomm. "High-accuracy reflectance mapping of microoptical components." In Optical Fabrication and Testing. Washington, D.C.: OSA, 2000. http://dx.doi.org/10.1364/oft.2000.pd2.

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McTrusty, T. J., and J. D. Dudinsky. "REMUS UUV navigation accuracy testing." In Oceans 2003. Celebrating the Past ... Teaming Toward the Future (IEEE Cat. No.03CH37492). IEEE, 2003. http://dx.doi.org/10.1109/oceans.2003.178070.

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Donkers, Adriane M., Jo W. Tombaugh, and Richard F. Dillon. "Observer accuracy in usability testing." In Posters and short talks of the 1992 SIGCHI conference. New York, New York, USA: ACM Press, 1992. http://dx.doi.org/10.1145/1125021.1125116.

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Cogan, Jonathan. "Tracker accuracy requirements and testing." In AeroSense '99, edited by Ronald J. Lewandowski, Loran A. Haworth, and Henry J. Girolamo. SPIE, 1999. http://dx.doi.org/10.1117/12.352821.

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Gemma, Takashi, Shigeru Nakayama, Yuichi Takigawa, Hajime Ichikawa, Takahiro Yamamoto, Yusuke Fukuda, Tetsuji Onuki, and Toshiro Umeda. "testing at 1nm accuracy for sub-mm asphericity." In Optical Fabrication and Testing. Washington, D.C.: OSA, 2002. http://dx.doi.org/10.1364/oft.2002.owd4.

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Tekell, Nicole. "Improvements High Accuracy Vibration Table Testing." In 2008 U.S. Air Force T&E Days. Reston, Virigina: American Institute of Aeronautics and Astronautics, 2008. http://dx.doi.org/10.2514/6.2008-1676.

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Gu, Zhongxian, Mohamed A. Soliman, and Florian M. Waas. "Testing the accuracy of query optimizers." In the Fifth International Workshop. New York, New York, USA: ACM Press, 2012. http://dx.doi.org/10.1145/2304510.2304525.

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Price, William O., and Kenneth W. Canaga. "Accuracy Estimation in Anechoic Chamber Testing." In 1985 IEEE International Symposium on Electromagnetic Compatibility. IEEE, 1985. http://dx.doi.org/10.1109/isemc.1985.7566935.

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Reports on the topic "Accuracy of testing"

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Rauscher, H. Michael. The microcomputer scientific software series 4: testing prediction accuracy. St. Paul, MN: U.S. Department of Agriculture, Forest Service, North Central Forest Experiment Station, 1986. http://dx.doi.org/10.2737/nc-gtr-107.

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McCracken, Michael W., and Todd E. Clark. Nested Forecast Model Comparisons: A New Approach to Testing Equal Accuracy. Federal Reserve Bank of St. Louis, 2009. http://dx.doi.org/10.20955/wp.2009.050.

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Chambers, Robert S., John M. Emery, Rajan Tandon, Bonnie R. Antoun, Mark E. Stavig, Clay S. Newton, Cory S. Gibson, and Denise N. Bencoe. Proposed Testing to Assess the Accuracy of Glass-To-Metal Seal Stress Analyses. Office of Scientific and Technical Information (OSTI), September 2014. http://dx.doi.org/10.2172/1158667.

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Schultz, Greg. Road to Future Testing Lies in Simulation: 'Flat Trac' Provides Accuracy, Control, Reduced Costs,. Fort Belvoir, VA: Defense Technical Information Center, March 1997. http://dx.doi.org/10.21236/ada323488.

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Miller, Ralph. Bystander Reporting: Effects of Early Testing and Accuracy Assessment for Critical Content: Supplemental materials. Https://orb.binghamton.edu/, September 2019. http://dx.doi.org/10.22191/orb/rrmiller/lab/1.

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Neymark, J., and D. Roberts. Deep in Data. Empirical Data Based Software Accuracy Testing Using the Building America Field Data Repository. Office of Scientific and Technical Information (OSTI), June 2013. http://dx.doi.org/10.2172/1220085.

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Bergen, Anthony, Peter Blattner, Armin Sperling, and Richard Young. CIE TN 009:2019 The Use of “Accuracy” and Related Terms in the Specifications of Testing and Measurement Equipment. International Commission on Illumination, 2019. http://dx.doi.org/10.25039/tn.009.2019.

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Zirkel-Hofer, Annie, Stephen Perry, Sven Fahr, Korbinian Kramer, Anna Heimsath, Stephan Scholl, and Werner Platzer. Improved in situ performance testing of line-concentrating solar collectors: Comprehensive uncertainty analysis for the selection of measurement instrumentation. IEA SHC Task 55, October 2016. http://dx.doi.org/10.18777/ieashc-task55-2016-0001.

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Accurate and complete performance evaluation is playing a major role in the further development of concentrating solar collectors. To ensure dependable test results, an appropriate testing and evaluation procedure is required. Moreover, the selection and installation of suitable measurement instrumentation are essential for obtaining reliable data for the performance evaluation. The quality of the measurement instrumentation greatly influences the representativeness of the test results. Details on the measurement instrumentation recommended for the testing of low-temperature solar collectors have already been provided in the testing standard EN ISO 9806:2013.

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Becker, Sarah, Megan Maloney, and Andrew Griffin. A multi-biome study of tree cover detection using the Forest Cover Index. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/42003.

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Tree cover maps derived from satellite and aerial imagery directly support civil and military operations. However, distinguishing tree cover from other vegetative land covers is an analytical challenge. While the commonly used Normalized Difference Vegetation Index (NDVI) can identify vegetative cover, it does not consistently distinguish between tree and low-stature vegetation. The Forest Cover Index (FCI) algorithm was developed to take the multiplicative product of the red and near infrared bands and apply a threshold to separate tree cover from non-tree cover in multispectral imagery (MSI). Previous testing focused on one study site using 2-m resolution commercial MSI from WorldView-2 and 30-m resolution imagery from Landsat-7. New testing in this work used 3-m imagery from PlanetScope and 10-m imagery from Sentinel-2 in imagery in sites across 12 biomes in South and Central America and North Korea. Overall accuracy ranged between 23% and 97% for Sentinel-2 imagery and between 51% and 98% for PlanetScope imagery. Future research will focus on automating the identification of the threshold that separates tree from other land covers, exploring use of the output for machine learning applications, and incorporating ancillary data such as digital surface models and existing tree cover maps.

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Sparks, Paul, Jesse Sherburn, William Heard, and Brett Williams. Penetration modeling of ultra‐high performance concrete using multiscale meshfree methods. Engineer Research and Development Center (U.S.), September 2021. http://dx.doi.org/10.21079/11681/41963.

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Abstract:

Terminal ballistics of concrete is of extreme importance to the military and civil communities. Over the past few decades, ultra‐high performance concrete (UHPC) has been developed for various applications in the design of protective structures because UHPC has an enhanced ballistic resistance over conventional strength concrete. Developing predictive numerical models of UHPC subjected to penetration is critical in understanding the material's enhanced performance. This study employs the advanced fundamental concrete (AFC) model, and it runs inside the reproducing kernel particle method (RKPM)‐based code known as the nonlinear meshfree analysis program (NMAP). NMAP is advantageous for modeling impact and penetration problems that exhibit extreme deformation and material fragmentation. A comprehensive experimental study was conducted to characterize the UHPC. The investigation consisted of fracture toughness testing, the utilization of nondestructive microcomputed tomography analysis, and projectile penetration shots on the UHPC targets. To improve the accuracy of the model, a new scaled damage evolution law (SDEL) is employed within the microcrack informed damage model. During the homogenized macroscopic calculation, the corresponding microscopic cell needs to be dimensionally equivalent to the mesh dimension when the partial differential equation becomes ill posed and strain softening ensues. Results of numerical investigations will be compared with results of penetration experiments.

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