4-node system ... 10-node system ... 16-node system ...
Brendan Duffy, Swee Balachandran, María Consiglio, Louis Glaab, César Muñoz, Kyle Smalling, Nicholas Rymer, David Bradley, David Hare, Richard Grube, Matthew Coldsnow, Scott Sims, Jeffrey Hill, and Mahyar Malekpour: Sense and Avoid Characterization of the ICAROUS Architecture,
Technical Memorandum, NASA/TM-2020-220591, May 2020.
Correction: "The OM algorithm has been proven to reach agreement ... and does not require initial synchrony among the good nodes."
Should read: "... and does require initial synchrony among the good nodes."
Sometimes you miss the forest for the trees. In my recent reports on the digraph protocol I emphasize that one of the assumptions is the absence of faults.
It turns out that's not quite accurate and the protocol handles more than just the no-fault scenarios. I had made a point of it in the previous two reports on the protocol.
After going through the analysis and writing a report on a deductive proof of the correctness of the protocol (currently under internal review), I verified that the protocol in fact handles link and node failures in a static and/or dynamic digraph.
Recently, I gave a talk on the topic where a colleague pointed out that this protocol is in fact fault-tolerant. I'd like to be clear about this; it is not Byzantine fault-tolerant, but
still fault-tolerant. It handles cases 1, 2, and 4 of the OTH fault classification.
I have had simulated link and node failures in dynamic digraphs back in 2010 but have not had the chance to model checking them.
In retrospect, the words fault-tolerant should have been in the title of these reports.
There are a number of typos in this report that I plan to list them here. Most of the typos are
corrected for the SSS 2006 conference paper listed above. Visit again for updates.
Amy M. Yates, Wilfredo Torres-Pomales, and Mahyar R. Malekpour, Oscar R. González, and W. Steven Gray:
"High-Intensity Radiated Field Fault-Injection Experiment For a Fault-Tolerant Distributed Communication System", DASC 2010 , pp. 15.
This section is about Henywell's Recoverable Computer System (RCS).
Richard Hess, Mahyar R. Malekpour: "Rapid Soft Fault Recovery", Society of Automotive Engineers (SAE) 2001 Transaction, volume 110, Journal of Aerospace, Document Number: 2001-01-2937, Section 1, pp 474-480, published in 2002.
Richard Hess, Mahyar R. Malekpour: "Rapid Soft Fault Recovery", 2001 International Conference on Lightning and Static Electricity, September 2001.
These are some of my extracurricular activities, a.k.a., artistic creativities.
All material contained and referenced within this section are copyright Mahyar R. Malekpour.
Inspired by the historical references to its name sake, Daedalus son Icarus, like its predecessor project DIADALUS. This logo's color reflects the burning, red, hot, desert sun.
We at NASA LaRC are good at many things, among them is coming up with acronyms that are easy to read, relate to, and pronounce. The name "spider" and its 8 legs were the inspirations for the distributed system under the study which consisted of a 4x4 bi-partite graph.
What better way to capture flight!
In 1999, the Digital Avionics Technical Committee (DATC) needed a logo for their newsletter and announced for a design competition.
My design was selected and helped with their goals. In 2022 a redesigned logo has been adopted.
The tag identifies links that are outside
the NASA domain
![[External Site Icon]](/images/exlink.gif "External Site Icon"){kind=small}
is an autonomous distributed fault-tolerant local positioning system
ICAROUS ...
Inspired by the historical references to its name sake, Daedalus son Icarus, like its predecessor project DIADALUS. This logo's color reflects the burning, red, hot, desert sun.
Kodiak ...
Inspired by its name sake, the bear Kodiak, which roams the lush greens and wooded mountains of Alaska.
Detect and AvoID Alerting Logic for Unmanned Systems (DAIDALUS) ...
Inspired by the historical references to its name sake, Daedalus.
Airborne Coordinated Conflict Resolution and Detection (ACCoRD) ...
Since KB3D has evolved, the logo was updated to more accurately reflect the intended objective of the project.
The SPIDER Logo/Poster ...
We at NASA LaRC are good at many things, among them is coming up with acronyms that are easy to read, relate to, and pronounce. The name "spider" and its 8 legs were the inspirations for the distributed system under the study which consisted of a 4x4 bi-partite graph.
Danger! Spider X-ing ...
Having fun with Spider.
KB3D ...
Never turned down a creative design challenge. For their work on KB3D, Cesar Munoz asked for a logo and here is what we came up with.
DATC ...
The SPIDER Logo/Poster ... 
Danger! Spider X-ing ...
