Results 21 to 30 of about 6,880,919 (266)

Satellite Detection in Unresolved Space Imagery for Space Domain Awareness Using Neural Networks

CoRR, 2022
This work utilizes a MobileNetV2 Convolutional Neural Network (CNN) for fast, mobile detection of satellites, and rejection of stars, in cluttered unresolved space imagery. First, a custom database is created using imagery from a synthetic satellite image program and labeled with bounding boxes over satellites for "satellite-positive" images.
Jarred Jordan, Daniel Posada, David Zuehlke, Angelica Radulovic, Aryslan Malik, Troy Henderson   +5 more
openaire   +3 more sources

Influence of Indirect Solar Irradiance on Satellite Observation

IEEE Access, 2021
With the development of Space Domain Awareness (SDA), satellites’ optical characteristics are becoming attention-grabbing. Sunlight was usually considered the only light source for the satellite observation.
Xia Wang, Can Xu, Yurong Huo, Ying Wan, Yang Liu, Jingyu Fu   +5 more
doaj   +1 more source

Activities of PMO optical space debris survey [PDF]

Anais da Academia Brasileira de Ciências
Space debris division of PMO is devoted to play an important role in the research of orbital mechanics and the development of space debris observation techniques in China.
ZHANG CHEN, ZHAO CHANGYIN
doaj   +2 more sources

CDSTAEP: Cross-Domain Spatial-Temporal Association Learning for Abnormal Events Prediction

Applied Sciences, 2023
Predicting network abnormal events and behavior can enhance security situation awareness and the ability to infer attack intentions. Most of the existing abnormal event prediction methods usually rely on the temporal relationship features between events ...
Mingcheng Gao, Ruiheng Wang, Hongliang Zhu, Yang Xin   +3 more
doaj   +1 more source

On the Role of Communications for Space Domain Awareness

Journal of Aerospace Information Systems
Space domain awareness (SDA) has become increasingly important due to the rapid growth of commercial space activities and the expansion of New Space. This paper examines the need for transitioning from centralized to distributed SDA architectures, highlighting the limitations of traditional centralized systems in scaling with increasing satellite nodes.
Nathaniel G. Gordon, Nesrine Benchoubane, Gunes Karabulut Kurt, Gregory Falco   +3 more
openaire   +4 more sources

Discrete Space-Target Trajectory Detection with a Linearity-Enhanced Network on Stacked Optical Images

Remote Sensing
Detecting discrete space-target trajectories from optical image sequences is important for ground-based space situational awareness, but direct sequence processing can be computationally expensive and sensitive to weak target responses.
Donghe Wang, Tongsu Zhang, Guoyi Zhang, Xiaohu Zhang, James A. Blake, Han Wang   +5 more
doaj   +1 more source

Behavior-oriented inside network security situation modeling and analysis

网络与信息安全学报, 2016
According to the situation awareness theory as well as the characteristics of the inside network security,a PMDV model for behavior-oriented inside network security situation modeling by dividing the inside network space into physical domain,information ...
Cheng ZHU, Jia-jia MIAO, Han-dong MAO
doaj   +3 more sources

EAA: Adapting the Segment Anything Model for Perception-driven Astronomical Source Extraction

The Astrophysical Journal Supplement Series
Source extraction is a fundamental task in astronomical data analysis, yet existing methods are often specialized to specific instruments, spectral bands, or imaging conditions, which limits their generalizability.
Han Wang, Tongsu Zhang, Siyang Chen, Guoyi Zhang, Zhihua Shen, Xia Yang, Peter J. Wheatley, Jorge Fernández Fernández, Ioannis Apergis, Matthew R. Burleigh, Don Pollacco, Bin Lin, James A. Blake, Xiaohu Zhang   +13 more
doaj   +1 more source

Epigenetic reprogramming of lineage switching in cancer

FEBS Letters, EarlyView.
Cancer cells rarely commit to a single identity. Epigenetic mechanisms and tumor microenvironment cues push epithelial cells toward flexible, hybrid states that can shift into mesenchymal, neuroendocrine, or stem‐like fates, driving metastasis, drug resistance, and tumor heterogeneity. Targeting the epigenetic regulators behind these transitions, using
Ezgi Boyvatlı, Burcu Akman, Ezgi Bağırsakçı, Nese Atabey, Serap Erkek‐Ozhan   +4 more
wiley   +1 more source

Metastatic niche shaped by host factors influences disseminated cancer cell fate

FEBS Letters, EarlyView.
Metastasis is shaped not only by cancer cells but also by the environments they encounter. This review explores how factors such as aging, diet, the microbiome, lifestyle, and environmental exposures remodel organ‐specific niches in the lung, liver, bone, and brain, influencing where metastatic cells survive, remain dormant, or grow, and ultimately ...
Gwennan Delyth Ward, Álvaro Ruiz‐Tabas, Patricia Altea‐Manzano   +2 more
wiley   +1 more source