2,331 research outputs found
Pose Estimation and Tracking for ASIST
Aircraft Ship Integrated Secure and Traverse (ASIST) is a system designed to
arrest helicopters safely and efficiently on ships. Originally, a precision
Helicopter Position Sensing Equipment (HPSE) tracked and monitored the position
of the helicopter relative to the Rapid Securing Device (RSD). However, using
the HPSE component was determined to be infeasible in the transition of the
ASIST system due to the hardware installation requirements. As a result,
sailors track the position of the helicopters with their eyes with no sensor or
artificially intelligent decision aid. Manually tracking the helicopter takes
additional time and makes recoveries more difficult, especially at high sea
states. Performing recoveries without the decision aid leads to higher
uncertainty and cognitive load. PETA (Pose Estimation and Tracking for ASIST)
is a research effort to create a helicopter tracking system prototype without
hardware installation requirements for ASIST system operators. Its overall goal
is to improve situational awareness and reduce operator uncertainty with
respect to the aircrafts position relative to the RSD, and consequently
increase the allowable landing area. The authors produced a prototype system
capable of tracking helicopters with respect to the RSD. The software included
a helicopter pose estimation component, camera pose estimation component, and a
user interface component. PETA demonstrated the potential for state-of-the-art
computer vision algorithms Faster R-CNN and HRNet (High-Resolution Network) to
be used to estimate the pose of helicopters in real-time, returning ASIST to
its originally intended capability. PETA also demonstrated that traditional
methods of encoder-decoders could be used to estimate the orientation of the
helicopter and could be used to confirm the output from HRNet.Comment: 7 pages, 8 figures. Published in the Proceedings of the ASNE 2023
Technology, Systems & Ships Symposium. Reproduced with permission from the
American Society of Naval Engineers. Distribution Statement A: Approved for
public release; distribution is unlimited, as submitted under NAVAIR Public
Release Authorization 2023-01
DISCORDANCE IN LOW-DENSITY LIPOPROTEIN PARTICLE NUMBER (LDL-P) AND APOLIPOPROTEIN B (APO B) LEVEL
An Analysis of Fundamental Waffle Mode in Early AEOS Adaptive Optics Images
Adaptive optics (AO) systems have significantly improved astronomical imaging
capabilities over the last decade, and are revolutionizing the kinds of science
possible with 4-5m class ground-based telescopes. A thorough understanding of
AO system performance at the telescope can enable new frontiers of science as
observations push AO systems to their performance limits. We look at recent
advances with wave front reconstruction (WFR) on the Advanced Electro-Optical
System (AEOS) 3.6 m telescope to show how progress made in improving WFR can be
measured directly in improved science images. We describe how a "waffle mode"
wave front error (which is not sensed by a Fried geometry Shack-Hartmann wave
front sensor) affects the AO point-spread function (PSF). We model details of
AEOS AO to simulate a PSF which matches the actual AO PSF in the I-band, and
show that while the older observed AEOS PSF contained several times more waffle
error than expected, improved WFR techniques noticeably improve AEOS AO
performance. We estimate the impact of these improved WFRs on H-band imaging at
AEOS, chosen based on the optimization of the Lyot Project near-infrared
coronagraph at this bandpass.Comment: 15 pages, 11 figures, 1 table; to appear in PASP, August 200
Image processing as state reconstruction in optics
The image reconstruction of partially coherent light is interpreted as the
quantum state reconstruction. The efficient method based on maximum-likelihood
estimation is proposed to acquire information from registered intensity
measurements affected by noise. The connection with totally incoherent image
restoration is pointed out. The feasibility of the method is demonstrated
numerically. Spatial and correlation details significantly smaller than the
diffraction limit are revealed in the reconstructed pattern.Comment: 10 pages, 5 figure
Model-based estimate of the heat budget in the East China Sea
Using a global ocean model with regionally focused high resolution (1/10°) in the East China Sea (ECS), we studied the oceanic heat budget in the ECS. The modeled sea surface height variability and eddy kinetic energy are consistent with those derived from satellite altimetry. Significant levels of eddy kinetic energy are found east of the Ryukyu Islands and east of Taiwan, where the short-term variability is spawned by active mesoscale eddies coalescing with the circulation. Furthermore, the simulated vertical cross-stream structure of the Kuroshio (along the Pollution Nagasaki line) and the volume transport through each channel in the ECS are in good agreement with the observational estimates. The time-averaged temperature fluxes across the Taiwan Strait (TWS), Tsushima Strait (TSS), and the 200 m isobath between Taiwan and Japan are 0.20 PW, 0.21 PW, and 0.05 PW, respectively. The residual heat flux of 0.04 PW into the ECS is balanced by the surface heat loss. The eddy temperature flux across the 200 m isobath is 0.005 PW, which accounts for 11.2% of the total temperature flux. The Kuroshio onshore temperature flux has two major sources: the Kuroshio intrusion northeast of Taiwan and southwest of Kyushu. The Ekman temperature flux induced by the wind stress in the ECS shows the same seasonal cycle and amplitude as the onshore temperature flux, with a maximum in autumn and a minimum in summer. We conclude that the Ekman temperature flux dominates the seasonal cycle of Kuroshio onshore flux
Strengthening Peer Mentoring Relationships for New Mothers: A Qualitative Analysis
(1) Background: The transition to motherhood can be challenging, especially for first-time mothers, and can accompany maternal distress. Social support—such as that offered by peers— can be important in assisting mothers to manage such distress. Although primiparous mothers often seek out and value peer support programs, few researchers have investigated factors that may influence the strength of relationships in non-professional maternal peer support programs. Insight into these factors can be key to enhancing the success of future peer support interventions.
(2) Methods: Reflexive thematic analysis was applied to data gathered from 36 semi-structured interviews conducted with 14 primiparous mothers and 17 peer mentors in a peer support program.
(3) Results: Four themes related to successful mentorship were identified: expectations of peer relationship, independence of peer mentor, contact, and similarities. (4) Conclusions: For primiparous mothers who are developing their support network, these factors appear important for promoting close and effective peer support relationships. Interventions that harness the dynamics between these factors may contribute to more successful peer support relationships and mental health outcomes for participants
Introductory programming: a systematic literature review
As computing becomes a mainstream discipline embedded in the school curriculum and acts as an enabler for an increasing range of academic disciplines in higher education, the literature on introductory programming is growing. Although there have been several reviews that focus on specific aspects of introductory programming, there has been no broad overview of the literature exploring recent trends across the breadth of introductory programming.
This paper is the report of an ITiCSE working group that conducted a systematic review in order to gain an overview of the introductory programming literature. Partitioning the literature into papers addressing the student, teaching, the curriculum, and assessment, we explore trends, highlight advances in knowledge over the past 15 years, and indicate possible directions for future research
- …