Digital Commons Network^™

Applying Machine Learning To Equatorial Plasma Bubble Now Casting On Cubesats, Benjamin Lewis, Shawn Jones, Charles Swenson, Kevin Moon, Mario Harper

Small Satellite Conference

Equatorial plasma bubbles are a space weather phenomenon that occur at low latitudes within the Earth’s ionosphere. These bubbles are regions of low-density plasma that form at the base of the ionosphere and expand upward through the peak and into the topside. They form in the early evening and persist through the nighttime, stretching north and south along magnetic field lines and effecting a sector of longitudes a few degrees wide. These bubbles cause scintillations on radio signals that pass through them, disrupting the performance of systems, such as GPS, throughout the night in regions around the Earth. Due to …

Advancing Extraterrestrial Exploration Through Automated Ground Vehicles, Luisa Eusebia Gonzalez, Jackson Cordova, David Tuck Forbes, Grant Cardin, Alexander Debartolo, Allen Mitchell Malfavon, Harvey Perkins, Stephen Thiam-Choy Kwok-Choon

Small Satellite Conference

The project focuses on the development and fabrication of two multi-terrain rovers with autonomous tracking, navigation, and recovery capabilities. Driven by mission requirements for autonomous terrain maneuverability and flexible payload hosting, this team proposes a design that addresses the diverse needs of extraterrestrial exploration. The project features: a rocker-bogie chassis, with six-wheel drive capabilities, that will be providing the necessary stability and mobility across challenging terrains. A mounting place with universal spacing allows for the attachment of multiple payload types, ensuring adaptability for various scientific missions. The integration of micro controllers facilitates communication between the rovers and operators. Two distinct …

Arcticsat: A Cubesat For Canada’S North, With Canada’S North, Andrew Bowman, David Kattegatsiak, Spencer Ryznar, Layne Ransom, Shakiba Mir Ahmadi, Aref Asgari, Riley Sweeney, Ricky Gill, Vishnu Nadan, Bashar Esmail, Fatiah Balogun, Dustin Isleifson, Kiledar Singh Tomar, John Yackel, Philip Ferguson

Small Satellite Conference

Canada’s northern Inuit and Indigenous communities are experiencing climate change four times faster than the rest of the planet, impacting their traditional means of travel, hunting, and fishing. As temperatures rise, the sea ice forms later and melts earlier, allowing less time to perform these activities safely. While current satellite radiometry data can provide insight into the safety of the ice, Inuit communities require more timely and open access to this data. ArcticSat is a 3U CubeSat being co-developed with the Hamlet of Chesterfield Inlet, Nunavut, Canada, made to accomplish these goals. Community co-development ensures that community members lead the …

Microgravity Experiment To Measure The Speed Of Sound Inside Simulated Asteroid Regolith In The Iss Environment, Sebastian J. Medina Maysonet, Amilcar Rincon-Charris

Small Satellite Conference

In impact threat assessments of planetary defense options, the aim is to understand how seismic waves travel through the debris, either modifying its shape or its surface. Seismic disturbances can destabilize loose material resting on the slope, causing downward flows. With the Microgravity Experiment for Asteroid Regolith Sound Velocity (MESSAR), it is proposed to measure the sound velocity within the simulated asteroid regolith in the microgravity environment of the International Space Station (ISS). The payload contains several granular samples of simulated asteroid regolith that will be used to measure the influence of grain size and confining pressure on the wave …

Putting The “Space” In Hyperspace: Investigating Hyperdimensional Computing For Space Applications, Ian R. Peitzsch, Evan W. Gretok, Alan D. George

Small Satellite Conference

Earth observation (EO) is currently a major application area of satellite operations. As more powerful imagers become more accessible and see increased use, these EO images will increase in size, which also increases the computational complexity of classifying them. Using neural networks for this task has limitations due to the small memory and compute capability possessed by embedded platforms. Instead, this research investigates a shift in machine-learning paradigms from neural networks to hyperdimensional computing (HDC). HDC uses very large vectors to represent and draw relations from data. HDC often has a lower latency, power usage, and memory footprint than neural …

Advancing Autonomy In Distributed Space Systems: Results From The Distributed Spacecraft Autonomy Experiment On Starling 1.0, Caleb Adams, Michael Iatauro, Brian Kempa, Richard Levinson, Jeremy Frank, Sergei Gridnev, Caroline Lassiter

Small Satellite Conference

The Distributed Spacecraft Autonomy (DSA) team at NASA’s Ames Research Center presents results of the DSA experiment onboard the Starling 1.0 mission. The DSA system showcases collaborative resource allocation for multi-point science data collection with four small spacecraft, highlighting autonomy in decision-making as a crucial factor for multi-spacecraft missions. Central to DSA’s operations is an autonomous GPS channel selection process used to optimize channel selection across the spacecraft swarm; the goal is to demonstrate fast, autonomous reactions to relevant scientific data. This is showcased by demonstrating the ability to capture ionospheric phenomena such as the Equatorial Ionization Anomaly and Polar …

Modelling Climate Effects On Site Productivity And Developing Site Index Conversion Equations For Jack Pine And Trembling Aspen Mixed Stands, Mahadev Sharma

Aspen Bibliography

Forest site productivity estimates are crucial for making informed forest resource management decisions.These estimates are valuable both for the tree species currently growing in the stands and for those being considered for future stands. Current models are generally designed for pure stands and do not account for the influence of climate on tree growth. Consequently, site index (SI) conversion equations were developed specifically for jack pine (Pinus banksiana Lamb.) and trembling aspen (Populus tremuloides Michx.) trees grown in naturally originated mixed stands. This work involved sampling 186 trees (93 of each species) from 31 even-aged mixed stands (3 …

[Mev Gamma-Ray Detector On The 50-Kg Class Satellite], K. S. Tanaka, J. Katasoka, R. Iwashita, R. Mori, T. Suga, S. Ogasawara, M. Tao, Y. Yatsu, C. Toshihiro, S. Takeda, M. Onishi

Small Satellite Conference

We are planning to launch a 50kg-class satellite named GRAPHIUM, equipped with a small, high-performance Hybrid Compton Camera (INSPIRE) for MeV gamma-ray astronomy. Since the launch of the COMPTEL satellite in 1991, there have been limited observations in the MeV gamma-ray band. However, this energy range is crucial for studying nucleosynthesis processes. GRAPHIUM aims to conduct a wide-area survey of nuclear gamma rays from the galactic plane and includes gamma-ray observaitons of solar flares as one of its objectives. Equipped with a hybrid Compton camera system, GRAPHIUM can perform simultaneous X-ray and gamma-ray imaging. This is achieved by integrating the …

Binar Space Program: Mission 2 Update, Kyle Mcmullan, Fergus Downey, Jacob Cook, Nic Rogers, Chelsea Tay, Hans Benz, Tristan Ward, Daniel Turner, Stuart Buchan, Daniel Busan, Benjamin Hartig, Martin Towner, Robert Howie, Phil Bland, Jonathan Paxman

Small Satellite Conference

The Binar Space Program's (BSP) second mission consists of three 1U CubeSats scheduled for launch in August of 2024. Following the partial success of the BSP's first mission, Binar-1, many technological improvements have been made to the Binar 1U platform. These improvements enable Binar 2, 3, and 4 to carry 0.5U of payload, which is being used by the Australian Commonwealth Scientific and Industry Research Organization (CSIRO) to test two new radiation shielding materials developed in Australia. In addition to the primary payload, each CubeSat will fly three different communication systems, new deployable solar arrays and carry operating software that …

Design And Development Of 2u Spirone Cubesat For Verification Of Navigation Signal Generator In Leo Environment And Marine Plastic Observation, Sunhwan Gwon, Pilkyo Jeong, Hyewon Park, Ah-Yeon Park, Minji Kim, Kihyun Kim, Hyewon Jo, Hyung-Goo Lim, Ina Jeong, Ahn Doeun, Hyunjung Kim, Lee Hoonseok, O-Jong Kim

Small Satellite Conference

This study aims to undertake the development of the SPIRONE Cube-satellite. The technical mission involves the development and validation of an S-band navigation signal generator for Low Earth Orbit (LEO), and the scientific mission is to observe marine plastics using Long-Wave Infrared (LWIR) and Short-Wave Infrared (SWIR) cameras. Traditional satellite navigation systems operate at medium Earth orbits around 20,000 km, where signals can weaken and become vulnerable to interference, impacting air navigation, shipping, and autonomous vehicles, potentially causing severe accidents. To address this, the project aims to explore LEO-based navigation by operating CubeSats in LEO to collect experimental data and …

Otter: A Small Satellite For Responsive Space, David Freiknecht, Marc Hafemeister

Small Satellite Conference

The dependence on space-based infrastructure for navigation and communication at sea and on land is greater than ever and provides a significant example of how the failure of a satellite can have far-reaching consequences for civilian and military end users depending on these capabilities. As the likelihood of a collision, technical failure or even an attack on the space architecture increases, the protection of this critical infrastructure in space becomes an even higher priority. This is where the Responsive Space Capabilities come into play which aim at recovering the missing capability in a quick manner. This can be achieved through …

Mission Sealion Integrated Cubesat Design Approach To Accommodate Mission Critical Payloads In A Low Earth Orbit, Sharanabasaweshwara Asundi, Christopher Schappi, Jimesh Bhagatji, Joshua Warren, Jeries Abedrabbo

Small Satellite Conference

In the dynamic landscape of space applications, CubeSats have emerged as pivotal platforms for scientific research, technological innovation, and educational endeavors. As the demand for small form factor satellites continues to rise, there is an increasingly critical need for a holistic and rapid development approach in the design of CubeSat structures and payloads. This research focuses on Old Dominion University’s (ODU) integrated design approach of accommodating mission critical payloads in its second space mission, nicknamed Mission SeaLion. The 3U CubeSat class satellite mission is a partnership between ODU, the U.S. Coast Guard Academy (USCGA), and the U.S. Air Force Institute …

Vertecs: 6u Cubesat Mission To Study Star-Formation History By Observation Of Visible Extragalactic Background Light, Kei Sano, Rodrigo Cordova, Victor Hugo Schulz, Pooja Lepcha, Necmi Cihan Örger, Daisuke Nakayama, Joseph Ofosu, Reynel Josué Galindo Rosales, Pema Zangmo, Ezra Fielding, Keenan Chatar, Yukihisa Otani, Hisataka Kawasaki, Bastien Morelle, John Paul Almonte, Shunsuke Nakagawa, Yuto Tome, Shohei Karaki, Chinathip Narongphun, Hari Ram Shrestha, Marco Rosa, David Dai, Wenceslao Bejarano, Akihiro Ikeda, Rin Sato, Yusuke Iwaki, Kentaro Hayashida, Hiroki Miyagawa, Masahiro Nishioka, Kana Kurosaki, Isami Kato, Mengu Cho, Hirokazu Masui, Tetsuhito Fuse, Eyoas Areda, Kentaro Kitamura, Mariko Teramoto, Takashi Yamauchi, Ryo Hashimoto, Emino Fukumoto, Zamba Leonel, Arisa Oho, Shoki Yabumoto, Hayato Masuno, Chisato Arakawa, Kouta Miyamoto, Takao Nakagawa, Kohji Takimoto, Aoi Takahashi, Hideo Matsuhara, Umi Enokidani, Hayato Tanaka, Naoki Isobe, Yasuyuki Miyazaki, Ryu Funase, Hajime Kawahara, Keiichi Hirako, Shuji Matsuura, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Yuki Ohara, Satoshi Ikari, Kohji Tsumura, Ichiro Jikuya, Takehiko Wada, Yoichi Yatsu, Yoshihide Aoyanagi

Small Satellite Conference

We describe an astronomical 6U CubeSat mission VERTECS (Visible Extragalactic background RadiaTion Exploration by CubeSat). The scientific purpose of VERTECS is to reveal star-formation history of the universe by observation of the extragalactic background light (EBL) in visible wavelengths. Earlier observations by sounding rockets and infrared astronomical satellites have shown that the near-infrared EBL is several times brighter than the integrated light of known galaxies. As candidates for the excess light, first-generation stars in the early universe or low-redshift intra-halo light have been proposed, but it has not been concluded. Since these objects are expected to show different emission spectra …

Design, Characterization, And Testing Of Hert, A Miniaturized High-Energy-Resolution Relativistic Electron Telescope For Cubesats, Hong Zhao, Will Teague, Lauren Blum, Xinlin Li, Jared Cantilina, Will Edgar, Tyler Bishop, Patricio Ramos, Skyler Krantz

Small Satellite Conference

Earth's outer radiation belt is filled with relativistic electrons in the MeV energy range and above. These highly energetic electrons pose significant threats to avionics and humans in space, and understanding their dynamics has been an urgent need. As CubeSats increasingly play a more prominent role by executing missions at a far lower cost, they become ideal vehicles for conducting such scientific investigations. The miniaturized High-Energy-Resolution relativistic electron Telescope (HERT) is a compact telescope designed for a 6U CubeSat mission in a geosynchronous transfer orbit (GTO). HERT aims to provide high-energy-resolution (dE/E < 12%) measurements of 1 - 7 MeV electrons at GTO. These measurements will enable a novel method to differentiate the two main acceleration mechanisms, inward radial transport and local acceleration, and solve the longstanding question of how electrons in the Earth's radiation belts are accelerated to relativistic energies. Building upon the heritage of the Relativistic Electron Proton Telescope (REPT) instrument on the Van Allen Probes and the REPTile-2 instrument on CIRBE, HERT iS comprised of a stack of nine solid-state silicon detectors in a telescope configuration with a beryllium window to block lower energy electrons and a tantalum collimator to enforce the required FOV (33°). The instrument responses were investigated using Geant4 simulations, and the results project HERT to have a nominal energy resolution of ~5% for 1.5 - 3 Me V electrons and < ~12% for other core energy channels. Radiation testing has been conducted with a Cobalt-60 source, and the results suggest that HERT electronics can sustain a total ionizing dose of ~65 krad, meeting the instrument performance requirement in a GTO. Random vibration simulations have also been conducted, which suggest that HERT's reaction stresses and displacements are within a significant safety factor relative to yield strength from each component. Bench testing with muons and an SR-90/Y-90 radioactive source is ongoing to test HERT's performance. With a high energy resolution and a miniaturized design, HERT will greatly advance the quantitative understanding of relativistic electron acceleration in the outer radiation belt.

Development Of A Compact Wide-Field Telescope To Be Mounted On Vertecs, Kohji Takimoto, Takao Nakagawa, Aoi Takahashi, Kei Sano, Yuto Tome, Hisataka Kawasaki, Shunsuke Nakagawa, Rin Sato, Shuji Matsuura, Yuki Hirose, Akimasa Ojika, Akane Tsumoto, Taiko Iwaki, Kohji Tsumura

Small Satellite Conference

In recent years, CubeSat projects have initiated plans to conduct astronomical observations by deploying mission payloads. CubeSats present a promising solution for swiftly addressing critical challenges in astrophysics with flexibility. Within Cubeats, where both the bus system and mission payload occupy about half of the volume, there is a necessity to miniaturize mission equipment. The critical factor in astronomical observations, light-gathering ability, is determined not only by the aperture size but, more importantly for diffuse emission, by the optical throughput, i.e., the product of the aperture area and the observing solid angle. Consequently, even with a compact optical system, specializing …

Minicor: Miniature Coronagraph For Heliophysics Research, Angelos Vourlidas, Aaron Magner, James Mason, Luc Gilles, Joe Centurelli, Arnaud Thernisien, Clarence Korendyke, Gabriel Gutierrez, Giogia Casadei, Miguel Pereira

Small Satellite Conference

Coronagraphs are the only instruments that can capture the development of coronal mass ejections (CMEs) throughout the near-Sun space. Thus, they provide critical information for the physics of CME evolution and propagation and consequently for space weather forecasting. It makes strategic sense to lower the technological and logistical barriers for maintaining space-based coronagraphic observations. MiniCOR is an ambitious coronagraph design to address these challenges. The technical goal of MiniCOR is to demonstrate that a low-cost miniaturized 3U coronagraph, can return data with higher cadence and equal or better sensitivity than currently operating full-size coronagraphs. MiniCOR is a funded project under …

Big Red Sat-1: Mission Overview And Future Opportunities For Perovskites In Low Earth Orbit, Walker S. Arce, Vince Orsi, Nick Wayman, Joel Murch-Shafer, Karen Stelling, Robert Schmidt, Kelly Schutt, Joseph M. Luther, Hadi Afshari, Ian Sellers

Small Satellite Conference

Perovskite solar cells are an emerging technology that holds the promise of reducing the size and weight of solar panels on satellites. While many research laboratories have produced perovskite solar cells and characterized their performance in laboratory conditions, few have endeavored to launch them into space. The Big Red Sat-1 (BRS-1) is one such satellite, designed to incorporate three different perovskite solar cell architectures along with custom curve tracing instrumentation for launch into low earth orbit through NASA's CubeSat Launch Initiative. The curve tracer is realized using a precision resistor ladder with high quality current and voltage measurements. Perovskite solar …

Statistical Anomaly Analysis Of Small Satellite Missions Focusing On Payloads, Alexander Schmidt, Nico Gerster, Johannes Bachmann, Alexander Groß, Roger Förstner

Small Satellite Conference

With the rapid development of space technology, the number of new satellites has expanded rapidly in recent years, and the applications of satellites have gradually expanded into other industries and deeper into academia. While the small satellite category is experiencing significant growth, the behavior of small satellites still requires more in-depth study. A growing number of academic and industrial customers are looking to use satellites to achieve their scientific or business goals without having to develop a full satellite mission, including a satellite platform. Hosting payloads on other satellites or procuring pre-qualified platforms enables new mission flexibility while minimizing the …

University Nanosatellite Program: Assessment Of Impacts From 25 Years Of Education, Discussion Of On-Going And Future Efforts, Sarah Fox, Lee Jasper, Beth Hemmerich, Emilia Colman, Seth Sisneros

Small Satellite Conference

The University Nanosatellite Program (UNP) was founded in 1999 as the first government funded program to mentor university students in the design, integration, and operations of small satellites. This program provides a platform for university programs to develop DoD-relevant small satellite technologies while training the next generation in the principles and practices of systems engineering. UNP has assisted in the development of over 100 missions from over 53 universities across the country and has over 11,000 alumni.

This paper presents several aspects of UNP: a reflection on historical outcomes and impacts, educational impact on UNP participants, its current efforts, and …

Printed Circuit Board Reaction Wheels For Small Satellites, Saral Tayal, Paulo Fisch, Zachary Manchester

Small Satellite Conference

Reaction wheels are critical for spacecraft attitude control, enabling precise pointing. However, conventional designs are bulky and expensive, limiting their application in CubeSats and PocketQubes. This paper introduces a novel PCB motor architecture specifically designed for reaction wheels in small satellites. Our design integrates motor windings as traces on the PCB and utilizes a dual-purpose rotor-flywheel combination, resulting in a volumetrically efficient configuration. Additionally, the reaction wheel’s PCB casing enables multifunctional capabilities, such as serving as the satellite’s structural elements or solar panels. The accessibility of PCB manufacturing offers a simplified and cost-effective production process, with each reaction wheel costing …

Development Of The Moci Adcs-01 Verification Test, Rinisha Ramprakash, Wali Mian, Deepak R. Mishra

Small Satellite Conference

The members of the Guidance and Navigation Control team (GNC), whose primary goal is to calculate the commands needed to steer the Cubesat where it is desired to be, determine the CubeSat's orbital parameters such as the positions, and adjust the path of the CubeSat to meet mission requirements, will be conducting research at the University of Georgia Small Satellite Research Laboratory (SSRL). This research will be focused on helping test the Attitude Determination Control System (ADCS) of the Multiview Computational Onmoard Imager (MOCI) CubeSat, which is a system that is responsible for determining and maintaining the orientation of the …

Preliminary Design Of A 3d Printing System For Creating Infinitely Large Structures In Space, Stephen Timperley, Grant Stec, Daniel Miller

Small Satellite Conference

As interest in the space environment grows, the demand for larger and more capable space systems will follow. A possible solution to fill this demand is additive manufacturing in the form of 3D printing. This paper showcases a working preliminary system to 3D print large structures in space from a small satellite. This is achieved by replacing the normal Z axis control of a conventional CoreXY fused deposition modeling (FDM) 3D printer with a system to move along an infinitely extendable printed track. Having the ability to print and then move along this track creates a cycle of printing and …

Commissioning Plans For The Pandora Smallsat: A Mission To Quantify Stellar Contamination Of Exoplanet Transmission Spectra, Lindsey Wiser, Jessie Dotson, Thomas Greene, Thomas Barclay, Knicole Colon, Christina Hedges, Ben Hord, Aishwarya Iyer, Elisa Quintana, Rae Holcomb, Trevor Foote, Jordan Karburn

Small Satellite Conference

Pandora is a SmallSat mission designed to observe exoplanet atmospheres and stellar activity. Funded by the NASA Science Mission Directorate (SMD) Astrophysics Division through the Pioneers program, Pandora is a collaboration between NASA centers Goddard and Ames, the Lawrence Livermore National Laboratory, the University of Arizona, and other scientific institutions. Pandora will survey at least 20 transiting exoplanets during one year of science operations, obtaining a long baseline of simultaneous visible-light photometric and near-IR spectroscopic observations. These observations will be used to quantify and correct for stellar contamination of exoplanet transmission spectra due to spots and faculae on host stars. …

The Cosmic X-Ray Background Nanosatellite 3 (Cxbn-3): Toward An Improved Understanding Of Diffuse Emission Produced By High-Redshift Active Galactic Nuclei, Breno Mascarenhas Pontes, Brannon Jones, Thomas Pannuti, Jaden Yates, Benjamin Malphrus

Small Satellite Conference

The Cosmic X-ray Background (CXB) is the diffuse emission of hard X-rays (3-300 keV) that is observed across the whole sky. The general consensus for the sources of the CXB (particularly at higher energies) are heavily obscured active galactic nuclei (AGN) located at a moderate redshift (z ≈ 1). To explore the properties of the CXB further (such as whether flux variations are present at different angular scales), the Space Science Center (SSC) at Morehead State University (MSU) is developing CXBN-3 (Cosmic X-ray Background Nanosatellite 3), a nanosatellite designed to measure the intensity of the CXB within the energy …

Aerodynamic Satellite Attitude Control In Very Low Earth Orbit, Cheng Chang, Robert Breidenthal, Bo-Chuan Lin, Ya-Xun Yang

Small Satellite Conference

Simulation of a 3U-sized standard platform with four control panels attached to the rear part of the satellite at an altitude of 300 km was performed in Simulink to verify the feasibility of the aerodynamic control. The entire controller is composed of three loops: one outer loop and two inner loops. The outer loop is based on the robust and tested quaternion error feedback regulator to provide the target torque input for the two inner loops. The inner loops are responsible for actuating the control panels, using the square-root-based PI controller and a dedicated designed Panel Selecting Method (PSM) to …

Development Of A Reaction Wheel Testbed With Object Tracking, Abigail Jocelyn Romero, Harvey Mallard Perkins, Stephen Thiam-Choy Kwok-Choon

Small Satellite Conference

This paper discusses the design, fabrication, and testing of a single axis reaction wheel testbed with optical object tracking. Reaction wheels enable satellites to control their attitude. This system can autonomously correct its attitude about a single axis and track an external object using an on-board camera. Tests were performed to calibrate the system and drive further iteration in the design. This system is intended for research and educational applications, including exploring satellite attitude control with aspects of hardware and software integration. Future work includes refinement of the object tracking algorithm and state estimation system to provide for more robust …

Engineering Model Development Of Lunacube: 6u Dual-Satellite Lunar Navigation And Communication System, Hirotaka Sekine, Kazuki Toma, Takeshi Matsumoto, Shinichi Nakasuka, Toshiki Tanaka, Takuji Ebinuma, Rion Sobukawa, Yoshihide Aoyanagi

Small Satellite Conference

Lunar navigation and communication satellite systems are now recognized as important infrastructure for more efficient lunar exploration. While establishing a full constellation system will take several more years, lunar surface explorations are already becoming more active. To address the immediate demand for positioning and communication relay, especially in the South Pole region, a nimble technology demonstration mission named Lunar Navigation CubeSat (LunaCube) has been proposed. Following the completion of preliminary design in 2021 and detailed design in 2022, the engineering model was developed in 2023. This paper presents updated orbit analysis that considers trade-off between orbit maintenance costs and positioning …

Performance Analysis Of A Pointing, Acquisition, And Tracking System For The Vision Laser Crosslink Mission, Yeji Kim, Pureum Kim, Han-Gyeol Ryu, Sang-Young Park

Small Satellite Conference

As the volume of space-borne data increases, laser communication techniques are being considered to achieve a fast transmission rate and high link security or privacy. The very-high-speed intersatellite link system using an infrared optical terminal and nanosatellite (VISION) mission comprises two 6U formation-flying nanosatellites, and its main objective is to achieve a Gbps-level inter-satellite data-transfer capacity by applying laser communication technology in free space. A pointing, acquisition, and tracking (PAT) system is required to establish and maintain a stable laser crosslink. In the CubeSat platform, the PAT system relies on a satellite attitude determination and control system (ADCS) for body …

A Systematic Review Of The Prevalence Of Late Identified Hearing Loss In Childhood, Karen Muñoz, Dylan Chan, Donald Goldberg, Diana Ortiz, Valerie James Abbott, Karl White

Communicative Disorders and Deaf Education Faculty Publications

Objectives

The objective of this systematic review was to assess the evidence about the prevalence of permanent hearing loss for children not identified from newborn hearing screening (NHS).

Design

Articles were grouped into three categories based on the methodological approach: (1) all participants received diagnostic testing, (2) otoacoustic emission (OAE) or pure tone screening was completed and those not passing were referred for a diagnostic test, and (3) data were retrieved from archival records. Study characteristics, prevalence, and contextual factors were synthesised and narratively described.

Study Sample

30 peer-reviewed articles.

Results

Prevalence of permanent hearing loss per 1,000 children ranged …

In Pursuit Of Eye Tracking For Visual Landscape Assessments, David Evans, Brent Chamberlain

Landscape Architecture and Environmental Planning Faculty Publications

Visual quality and impact assessments have historically relied on experts to formally evaluate the visual properties of a landscape. In contrast, environmental psychologists have studied subjective landscape preferences using ratings and surveys. These two approaches represent, respectively, the “objectivist” and “subjectivist” paradigms within visual landscape research. A gap, however, exists between these approaches: actual observation behaviors. In this paper, we argue for the inclusion of eye-tracking research in visual landscape assessments as a critical bridge between objective landscape qualities and subjective visual experiences. We describe the basics of eye-tracking methods and data types to introduce the role of eye movements …