crocal

14 ms·

91.
by crocal 7y ago
Anyone else would like to join a trek from Balrog to Cthulhu on a frosty Plutonian summer day?
92.
by crocal 7y ago
Sigh. The Lyon metro is only fully automated on line D. There is an ongoing project to automate line A and B. Lyon metro line D is relatively famous in mass transit signalling because it is one of the very first driverless metro and it feat
93.
by crocal 7y ago
As far as I can judge, the problem of untidy streets and insecurity in Paris have nothing to do with "uncontrolled immigration". Do you have some evidence supporting your statement?
94.
by crocal 7y ago
The article misses an important point. It’s not only a problem of technology, it’s also a problem of risk acceptance. While we accept to be killed by our own mistakes at the wheel, society (we) will not accept that a machine makes the same,
95.
by crocal 7y ago
This is all fine and good, but IMHO LA metro map says it all [1]. 6 lines. What a joke. This mega city should have light or heavy rail metro pretty much everywhere. It's even better if there are parking lots in abundance. Park & Ri
96.
by crocal 7y ago
As a side note, falling leaves is one of the most dreaded problem in rail transportation. Not only does it obstruct things very efficiently, including the passage of light, but it also makes the rail surface very slippery, making it sometim
97.
by crocal 7y ago
What is written here is sometimes wrong, sometimes over-simplifies what is needed to build robust systems. If look at the list: 7/ You absolutely must remove people who demonstrate they are not skilled for the role assigned to them in
98.
by crocal 7y ago
> .. and yet, it still crashed trains. Do you have evidence for that claim?
99.
by crocal 7y ago
You can design your platform in a number of ways to be relatively independant of the underlying CPU model, thereby mitigating the risk of supplier lock-in. All suppliers will try to find a way to achieve such target. It’s a different thing
100.
by crocal 7y ago
Design obsolescence is absolutely built-in for railway systems (safety related or not). It’s part of the fun of the profession to deal with bizarre voltages that are inherited from the 1930s. For sure it’s not something consumer electronics
101.
by crocal 7y ago
Whoops. Wrong article. Apologies. Blame my big fingers on this phone. The article is: « Analysis of Faults in an N-Version Software Experiment." Susan S. Brilliant, John C. Knight, Nancy G. Leveson (1990) And I found a PDF version her
102.
by crocal 7y ago
Tried already! It’s a disaster. Nancy Leveson & friends wrote articles about this. Yet, there are still people today convinced diverse programming is a good idea... Sigh. https://dblp.org/rec/conf/icse/Jaf
103.
by crocal 7y ago
Wires are also redundant ;). Then the actuator is usually a fail safe device such as relays.
104.
by crocal 7y ago
Statistics are used all the time in safety critical designs. But, this is key, they are then balanced with the outcome expected due to each statistical failure. The more serious the outcome, the less the tolerated statistical failure. In th
105.
by crocal 7y ago
(Same disclaimer) > What's changing now, is that those 3 computers are now no longer the same architecture I think / hope this idea will die a well deserved death. Rail systems must face 25 years lifetime and with such design o
106.
by crocal 7y ago
Voters are redundant too. Actuators receive safety release authorizations from all of them and will activate as long as one valid authorization is received.
107.
by crocal 7y ago
Because at a certain level of complexity and scale, it is possible to have managers in charge who no longer understand cause and consequences, especially if the time between the two is in years. Sometimes they don’t even want to understand
108.
by crocal 7y ago
I don’t have evidence, but most likely, it is to avoid the related costs and risks of certification of this « new » CPU for its intended usage. Not only the CPU but all the software stack needs to be re-proven safe, including compilers and
109.
NASA will send drone to explore Titan(nasa.gov)
2 points by crocal 7y ago|0 comments
110.
by crocal 7y ago
I don’t think so. Politicians use this trick but that does not mean it is « what held together civilizations ». Intelligent leadership, rule of the law, public wealth and opportunity for growth beat barbarians any time.
111.
by crocal 7y ago
If they can do this for 49MUSD then it’s a revolution. It’s a ridiculous amount of money for something like this. Just the management overhead of a project like this would cost millions, and the fact that it is short does not make it any ea
112.
by crocal 7y ago
How about making him the new chief of the FAA?
113.
by crocal 7y ago
> A good software assurance program in a flight environment should also be ensuring simulators are of high enough fidelity for testing and training. Actually, "must" not "should". Aeronautics certification standards r
114.
by crocal 7y ago
Your question is « how to think about it », not about receiving a pre-cooked answer. My suggestion is to think about it strategically. Make a diagnostic (what is wrong and why), derive principles (what are the truly important rules to obser
115.
by crocal 7y ago
Boeing’s leadership does not seem to lack engineering qualifications (reading their bio on the company website). What is the basis for your statement?
116.
Playing hard: a Netflix documentary about the “For Honor” video game development(playinghardthemovie.com)
2 points by crocal 8y ago|0 comments
117.
by crocal 8y ago
Thanks for the tip. Did you have a chance to compare with gamemaker?
118.
by crocal 8y ago
My God, it's full of stars!
119.
Ask HN: Who is working on repairing nerves?
1 points by crocal 8y ago|1 comments
120.
by crocal 8y ago
Implementor of similar systems here. 1. It's possible, but you have to understand that a pilot, however bright he may be, cannot be overloaded with too many modes of operations. You can't always have Neil Armstrong driving... 2. W

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