10,586 research outputs found
Unveiling the Power of Deep Tracking
In the field of generic object tracking numerous attempts have been made to
exploit deep features. Despite all expectations, deep trackers are yet to reach
an outstanding level of performance compared to methods solely based on
handcrafted features. In this paper, we investigate this key issue and propose
an approach to unlock the true potential of deep features for tracking. We
systematically study the characteristics of both deep and shallow features, and
their relation to tracking accuracy and robustness. We identify the limited
data and low spatial resolution as the main challenges, and propose strategies
to counter these issues when integrating deep features for tracking.
Furthermore, we propose a novel adaptive fusion approach that leverages the
complementary properties of deep and shallow features to improve both
robustness and accuracy. Extensive experiments are performed on four
challenging datasets. On VOT2017, our approach significantly outperforms the
top performing tracker from the challenge with a relative gain of 17% in EAO
A protocol of potential advantage in the low frequency range to gravitational wave detection with space based optical atomic clocks
A recent proposal describes space based gravitational wave (GW) detection
with optical lattice atomic clocks [Kolkowitz et. al., Phys. Rev. D 94, 124043
(2016)] [1]. Based on their setup, we propose a new measurement method for
gravitational wave detection in low frequency with optical lattice atomic
clocks. In our method, n successive Doppler signals are collected and the
summation for all these signals is made to improve the sensitivity of the
low-frequency GW detection. In particular, the improvement is adjustable by the
number of Doppler signals, which is equivalent to that the length between two
atomic clocks is increased. Thus, the same sensitivity can be reached but with
shorter distance, even though the acceleration noises lead to failing to
achieve the anticipated improvement below the inflection point of frequency
which is determined by the quantum projection noise. Our result is timely for
the ongoing development of space-born observatories aimed at studying physical
and astrophysical effects associated with low-frequency GW
NASAs Human Landing System: The Strategy for the 2024 Mission and Future Sustainability
In response to the 2018 White House Space Policy Directive- sustainable lunar exploration, and to the Vice Presidents March 2019 direction to do so by 2024, NASA is working to establish humanity's presence on and around the Moon by: 1) sending payloads to its surface, 2) assembling the Gateway outpost in orbit and 3) demonstrating the first human lunar landings since 1972. NASAs Artemis program is implementing a multi-faceted and coordinated agency-wide approach with a focus on the lunar South Pole. The Artemis missions will demonstrate new technologies, capabilities and business approaches needed for future exploration, including Mars. Assessing options to accelerate development of required systems, NASA is utilizing public-private engagements through the Human Exploration and Operations (HEO) Mission Directorates NextSTEP Broad Agency Announcements. The design, development and demonstration of the Human Landing System (HLS) is expected to be led by commercial partners. Utilizing efforts across mission directorates, the Artemis effort will benefit from programs from the Science Mission Directorate (SMD) and Space Technology Mission Directorate (STMD). SMDs Commercial Lunar Payload Services (CLPS) initiative will procure commercial robotic lunar delivery services and the development of science instruments and technology demonstration payloads. The Space Technology Mission Directorate (STMD) portfolio of technology advancements relative to HLS include lunar lander components and technologies for pointing, navigation and tracking, fuel storage and transfer, autonomy and mobility, communications, propulsion and power. In addition to describing the objectives and requirements of the 2024 Artemis mission, this paper will present NASAs approach to accessing the lunar surface with an affordable human-rated landing system, current status and the role o a sustainable lunar presence
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