Results 51 to 60 of about 3,097,030 (293)

Fault-tolerant relative navigation based on Kullback–Leibler divergence

International Journal of Advanced Robotic Systems, 2020
A fault-detection method for relative navigation based on Kullback–Leibler divergence (KLD) is proposed. Different from the traditional χ 2 -based approaches, the KLD for a filter is following a hybrid distribution that combines χ 2 distribution and F ...
Jun Xiong, Joon Wayn Cheong, Zhi Xiong, Andrew G Dempster, Shiwei Tian, Rong Wang, Jianye Liu   +6 more
doaj   +1 more source

The Four Key Challenges of Advanced Multisensor Navigation and Positioning [PDF]

, 2014
The next generation of navigation and positioning systems must provide greater accuracy and reliability in a range of challenging environments to meet the needs of a variety of mission-critical applications.
Martin, H, Jiang, Z, Henry Martin, Groves, PD, Wang, L, Lei Wang, Ziyi Jiang, Walter, D, Voutsis, K, Kimon Voutsis, Debbie Walter, Paul D Groves   +11 more
core   +1 more source

The ubiquitin system in normal and infected germinal center B cells

FEBS Letters, EarlyView.
The ubiquitin system plays a central role in germinal center (GC) B cells, influencing differentiation to long‐lived memory B cells. Oncogenic gammaherpesviruses gain access to memory B cells by establishing latency in GC B cells. Mapping ubiquitin mechanisms in normal and infected GC B cells will define specific molecular circuits in B cells germane ...
Destiny Davis, Lesly Mejia, Emily K Moser   +2 more
wiley   +1 more source

Vision-Based Relative Attitude and Position Estimation for Small Satellites with Robust Filtering Technique

Engineering Proceedings
Relative satellite navigation is critical for formation flying, rendezvous, and docking. This study augments a vision-based relative navigation framework with a robust multiplicative extended Kalman filter (RMEKF) that adaptively scales the measurement ...
Elif Koc, Halil Ersin Soken
doaj   +1 more source

Metastasis on pause: How dormant tumor cells stay hidden within the tumor microenvironment and evade immune surveillance

Molecular Oncology, EarlyView.
Dormant cancer cells can hide in distant organs for years, evading treatment and the immune system. This review highlights how signals from the surrounding tissue and immune environment keep these cells inactive or trigger their reawakening. Understanding these mechanisms may help develop therapies to eliminate or control dormant cells and prevent ...
Kanishka Tiwary, Jose Javier Bravo‐Cordero   +1 more
wiley   +1 more source

A Dual Grid Collaborative Navigation Method and Computer Simulation Based on Data Link [PDF]

Hangkong bingqi
In response to the demand for relative/absolute navigation positioning in combat formation cooperative operations under GNSS-denied environment, a dual grid collaborative navigation method based on data link is proposed.
Li Yongfeng, Hao Xiuqiang, Wu Zhenguo, Wu Gang, Guo Chubing
doaj   +1 more source

Circulating microRNA signatures of cachexia and cancer in Canis familiaris as a comparative oncology model for human disease

Molecular Oncology, EarlyView.
Circulating microRNAs as biomarkers of cachexia and sex‐specific cancer in senior dogs. In 25 client‐owned dogs, four circulating miRNAs (miR‐15a, miR‐15b, miR‐16, miR‐140) were downregulated in cachexia, with miR‐16 the strongest individual biomarker (AUC = 0.899).
Soon‐Seok Park, Kyongman An, Gyeonghwa Kim, Soo‐Nyun Choi, Hong‐Ki Lee, Keun Hur, Kyu‐Shik Jeong   +6 more
wiley   +1 more source

Observability Analysis and Navigation Filter Optimization of High-Orbit Satellite Navigation System Based on GNSS

Applied Sciences, 2020
Global Navigation Satellite System (GNSS) can be applied for the navigation of the high-orbit satellites. The system observability will change due to the changes in the visible satellite numbers and the spatial geometry between the navigation satellites ...
Yaqi Xiao, Xuanying Zhou, Jiongqi Wang, Zhangming He, Haiyin Zhou   +4 more
doaj   +1 more source

Relative navigation approach for vision-based aerial GPS-denied navigation

2013 International Conference on Unmanned Aircraft Systems (ICUAS), 2013
GPS-denied aerial flight is a popular research topic. The problem is challenging and requires knowledge of complex elements from many distinct disciplines. Additionally, aerial vehicles can present challenging constraints such as stringent payload limitations and fast vehicle dynamics. In this paper we propose a new architecture to simplify some of the
Robert C. Leishman, Timothy W. McLain, Randal W. Beard   +2 more
openaire   +3 more sources

Visual Navigation For On-Orbit Servicing Missions [PDF]

, 2013
Increasing complexity and costs of satellite missions promote the idea of looking for opportunities to extend the operational lifetime or to improve the performance of a satellite instead of simply replacing it by a new one.
Tzschichholz, Tristan, Boge, Toralf, Benninghoff, Heike   +2 more
core