Engineering topics
Publications and source records attributed to Hsu, E..
This paper summarizes the phase-2 of Trans-Pacific series of experiments and demonstrations by an international team in Canada, Japan, and the United States.
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This paper describes the technologies and services used in the experiments and demonstrations using the Trans-Pacific high data rate satellite communications infrastructure, and how the environment tasked protocol adaptability, scalability, efficiency, interoperability, and robustness.
In 1993, a proposal at the Japan-U.S. Cooperation in Space Program Workshop lead to a subsequent series of satellite communications experiments and demonstrations, under the title of Trans-Pacific High Data Rate Satellite Communications Experiments.
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This paper describes the experimental network configuration, application demonstration, and performance evaluation plan of the second phase experiment.
The emerging global information infrastructure involving a combination of satellite and terrestrial networks brings with it the increasing need in studying protocol performance within such an environment.
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A prototype digital optical module has been constructed for use in conjuction with the AMANDA neutrino detector at the South Pole.
Ths paper describes a future Transmission Control Protocol (TCP) test which was planned as a part of the Trans-Pacific High Definition Video Satellite Communications Experiment. The TCP test portion of the Trans-Pacific High Definition Video Satellite Communications Experiment intends to examine the correlation between the underlying assumptions of come TCP algorithms and the performance shortfalls observed when the algorithms are used in a stellite-based environment, and to make experimental changes to existing TCP variants to study the effects of the modifications.
Flight operations at the Jet Propulsion Laboratory (JPL) are now performed by teams of specialists, each team dedicated to a particular spacecraft. Certain members of each team are responsible for monitoring the performances of their respective spacecraft subsystems. Ground operations, which are very complex, are manual, labor-intensive, slow, and tedious, and therefore costly and inefficient. The challenge of the new decade is to operate a large number of spacecraft simultaneously while sharing limited human and computer resources, without compromising overall reliability. The Engineering Analysis Subsystem Environment (EASE) is an architecture that enables fewer controllers to monitor and control spacecraft engineering subsystems. A prototype of EASE has been installed in the JPL Space Flight Operations Facility for on-line testing. This article describes the underlying concept, development, testing, and benefits of the EASE prototype.
The Accuracy Assessment System (AAS) of the Large Area Crop Inventory Experiment (LACIE) was responsible for determining the accuracy and reliability of LACIE estimates of wheat production, area, and yield, made at regular intervals throughout the crop season, and for investigating the various LACIE error sources, quantifying these errors, and relating them to their causes. Some results of using the AAS during the three years of LACIE are reviewed. As the program culminated, AAS was able not only to meet the goal of obtaining accurate statistical estimates of sampling and classification accuracy, but also the goal of evaluating component labeling errors. Furthermore, the ground-truth data processing matured from collecting data for one crop (small grains) to collecting, quality-checking, and archiving data for all crops in a LACIE small segment.