Results 31 to 40 of about 3,080,528 (152)

Positioning performance analysis on combined GPS/BDS precise point positioning

Geodesy and Geodynamics, 2020
Combining the observation data from five Multi-GNSS Experiment (MGEX) stations with the precise orbit and clock products from Global Positioning System (GPS) and BeiDou Navigation Satellite System (BDS), we studied the model of combined GPS/BDS precise ...
Jing Xiong, Fei Han
doaj   +1 more source

Geometric Positioning Verification of Spaceborne Photon-Counting Lidar Data Based on Terrain Feature Identification

IEEE Journal of Selected Topics in Applied Earth Observations and Remote Sensing
The horizontal positioning error in spaceborne photon point clouds seriously constrains their elevation accuracy. To improve data quality for enhanced performance in scientific applications, this study proposes a photon correction method based on terrain
Cheng Wu, Qifan Yu, Shaoning Li, Anmin Fu, Mengguang Liao, Lelin Li   +5 more
doaj   +1 more source

A Comparative Study on Accuracy and Reproducibility of Alginate and Addition Reaction Silicone as an Impression Materials.

Update Dental College Journal, 2014
Background: To achieve accuracy and exact reproduction of prosthesis, choosing a perfect impression material is essential. Especially to make the prosthesis as accurately as possible, impression material should possess some essential properties, like ...
Shakila Fatema, Sheikh Md Shahriar Quader, Mohammad Shamsuzzaman, Mirza Md Arifur Rahman, Nasima Khan   +4 more
doaj   +1 more source

Accuracy of static computer-assisted implant placement in anterior and posterior sites by clinicians new to implant dentistry: in vitro comparison of fully guided, pilot-guided, and freehand protocols

International Journal of Implant Dentistry, 2020
Background One of the challenges encountered by clinicians new to implant dentistry is the determination and controlling of implant location. This study compared the accuracy of fully guided (FG) and pilot-guided (PG) static computer-assisted implant ...
Jaafar Abduo, Douglas Lau
doaj   +1 more source

Study of a dynamic downscaling scheme for quantitative precipitation forecasting [PDF]

Proceedings of the International Association of Hydrological Sciences, 2015
Dynamic downscaling is the best way to get high resolution quantitative precipitation forecasts. The Weather Research and Forecasting Model (WRF) was utilized as a dynamic downscaling tool in this study.
Y. Li, G. H. Lu, Z. Y. Wu, J. Shi
doaj   +1 more source

Smartphone GPS accuracy study in an urban environment.

PLoS ONE, 2019
An iPhone 6 using the Avenza software for capturing horizontal positions was employed to understand relative positional accuracy in an urban environment, during two seasons of the year, two times of day, and two perceived WiFi usage periods.
Krista Merry, Pete Bettinger
doaj   +1 more source

Role of barium enema examination for the diagnosis of submucosal invasion depth in T1 colorectal cancers

Cancer Imaging, 2021
Background The indication for endoscopic resection for submucosally invasive colorectal cancer (T1-CRC) depends on the preoperative diagnosis of invasion depth.
Keisuke Kawasaki, Takehiro Torisu, Takahisa Nagahata, Motohiro Esaki, Koichi Kurahara, Makoto Eizuka, Yoshihito Tanaka, Minako Fujiwara, Shinichiro Kawatoko, Yumi Oshiro, Shun Yamada, Koji Ikegami, Shin Fujioka, Yuta Fuyuno, Yuichi Matsuno, Junji Umeno, Tomohiko Moriyama, Takanari Kitazono, Tamotsu Sugai, Takayuki Matsumoto   +19 more
doaj   +1 more source

A Horizontal Accuracy Metric for Magnetic Navigation

Navigation
This paper develops a navigation accuracy metric for magnetic navigation when adapted to civil aviation. Metrics that are currently used may not directly apply to magnetic navigation because the assumptions behind these metrics are based on the ...
Prasenjit Sengupta
doaj   +1 more source

Accuracy Comparison between GPS Real Time Kinematic (RTK) Method and Total Station to Determine The Coordinate of An Area

Jurnal Teknik Sipil dan Perencanaan, 2018
. Survey with GPS Real Time Kinematic (RTK) has the advantage of being faster and easier than the total station, but on the other hand the accuracy of GPS Real Time Kinematic (RTK) is considered lacking.
Ispen Safrel, Eko Nugroho Julianto, Nur Qudus Usman   +2 more
doaj   +1 more source

Interpersonal welfare comparisons, redistributive effects, and horizontal inequieties in the income tax system [PDF]

, 1995
Vertical and horizontal equity principies occupy the core of income tax systems evaluation. Vertical inequality is measured in terms of relative or absolute income inequality indices, as in the analysis of the redistributive effects (RE) of progressive ...
Ruiz-Castillo, Javier
core   +1 more source