Results 41 to 50 of about 3,280,097 (317)

Research on the navigation method of high speed differential rotation guided ammunition with ballistic assistance prediction under GNSS denial

Defence Technology
In complex environments such as high dynamics and weak signals, a satellite signal compensation method based on prefabricated trajectory assistance and an improved adaptive Kalman filter is proposed for a 155 mm differential rotating rear-body control ...
Ning Liu, Kejun Hu, Bin Hu, Haorui Li, Kai Shen, Wenhao Qi, Junfang Fan, Zhong Su   +7 more
doaj   +1 more source

Enhancing Crop Mapping Precision through Multi-Temporal Sentinel-2 Image and Spatial-Temporal Neural Networks in Northern Slopes of Tianshan Mountain

Agronomy, 2023
Northern Slopes of Tianshan Mountain (NSTM) in Xinjiang hold significance as a principal agricultural hub within the region’s arid zone. Accurate crop mapping across vast agricultural expanses is fundamental for intelligent crop monitoring and devising ...
Xiaoyong Zhang, Yonglin Guo, Xiangyu Tian, Yongqing Bai   +3 more
doaj   +1 more source

Generating dynamic higher-order Markov models in web usage mining [PDF]

, 2005
Markov models have been widely used for modelling users’ web navigation behaviour. In previous work we have presented a dynamic clustering-based Markov model that accurately represents second-order transition probabilities given by a collection of ...
Mark Levene, Levene, Mark, José Borges, Borges, J.   +3 more
core   +1 more source

Analysis of Drill String Whirling Characteristics Based on Near-Bit Measurement Data

Shiyou jixie
The displacement signal of drill string vibration is difficult to be obtained in the actual drilling process. To further understand the vibration characteristics of drill string when whirling motion occurs in wellbore during drilling process， first， the ...
Zhang Tao, Yang Zhenpeng, Li Jun, Wang Miaorui, Wang Mengfan, Guo Zixian   +5 more
doaj   +1 more source

“We Cannot Talk as a Family”: Complexities of Survivorship Communication Among Hispanic/Latino Young Adult Survivors of Childhood Cancer, Parents, and Clinicians

Pediatric Blood &Cancer, EarlyView.
ABSTRACT Background Young adult childhood cancer survivors (YA‐CCS) have an increased risk of treatment‐related health complications throughout their lives. Lifelong survivorship care is recommended, yet many YA‐CCS experience disruptions in care during pediatric‐to‐adult transitions and do not receive recommended survivorship care.
Kevin Shanchen Pu, Nicole Fernández‐Viña, Briana C. Martin‐Villa, Daniela Ramirez, Rebecca M. Lewinsohn, Mary Smith, Heidi Boynton, Lidia Schapira, Stephanie M. Smith   +8 more
wiley   +1 more source

Research on Low-Cost Attitude Estimation for MINS/Dual-Antenna GNSS Integrated Navigation Method

Micromachines, 2019
A high-precision navigation system is required for an unmanned vehicle, and the high-precision sensor is expensive. A low-cost, high-precision, dual-antenna Global Navigation Satellite System/Micro-electromechanical Systems-Inertial Navigation System ...
Hailu Wang, Ning Liu, Zhong Su, Qing Li
doaj   +1 more source

Application Research of an Array Distributed IMU Optimization Processing Method in Personal Positioning in Large Span Blind Environment

IEEE Access, 2020
Aiming at the long-term cumulative error inherent in pedestrian indoor inertial positioning filed, that error is mainly due to the low signal-to-noise ratio of the sensor output signal quality, the temperature drift of the gyro and the accuracy of error ...
Hengzhi Liu, Qing Li, Chao Li, Hui Zhao
doaj   +1 more source

Simulation on a new reverse circulation fishing tool: Design and evaluation of the salvage capacity and efficiency

Energy Science & Engineering, 2023
To solve the insufficient energy for reverse circulation fishing tools in complex structure wells, it is necessary to further optimize the design of the tools to improve the impurity salvage efficiency.
Yumei Li, Na Si, Tao Zhang, Ming Liu, Liwei Yu, Yiming Zheng   +5 more
doaj   +1 more source

Feasibility of fault exclusion related to advanced RAIM for GNSS spoofing detection

, 2017
This paper will present an exercise to verify the usefulness of statistical testing of measurement residuals of an overdetermined position solution followed by measurement subset selection for spoofing detection and mitigation for certain spoofing events,
Innac,A., Stefan S�derholm, Juan Blanch, Salomon Honkala, Sherman Lo, R. Eric Phelts, Heidi Kuusniemi, Anna Innac, Giorgia Ferrara, Per Enge, Sarang Thombre, M. Zahidul H. Bhuiyan, Yu-Hsuan Chen, Todd Walter   +13 more
core   +1 more source

Towards Safe Navigation by Formalizing Navigation Rules [PDF]

, 2013
One crucial aspect of safe navigation is to obey all navigation regulations applicable, in particular the collision regulations issued by the International Maritime Organization (IMO Colregs).
Kreutzmann, A, Kreutzmann, A., Wolter, D, Lee, JH, Dylla, F., Lee, J. H., Wolter, D., Dylla, F   +7 more
core   +2 more sources