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General / Akin's Laws of Spacecraft Design
« Last post by NxtChg on May 04, 2018, 10:45:24 pm »
1. Engineering is done with numbers. Analysis without numbers is only an opinion.

2. To design a spacecraft right takes an infinite amount of effort. This is why it's a good idea to design them to operate when some things are wrong .

3. Design is an iterative process. The necessary number of iterations is one more than the number you have currently done. This is true at any point in time.

4. Your best design efforts will inevitably wind up being useless in the final design. Learn to live with the disappointment.

5. (Miller's Law) Three points determine a curve.

6. (Mar's Law) Everything is linear if plotted log-log with a fat magic marker.

7. At the start of any design effort, the person who most wants to be team leader is least likely to be capable of it.

8. In nature, the optimum is almost always in the middle somewhere. Distrust assertions that the optimum is at an extreme point.

9. Not having all the information you need is never a satisfactory excuse for not starting the analysis.

10. When in doubt, estimate. In an emergency, guess. But be sure to go back and clean up the mess when the real numbers come along.

11. Sometimes, the fastest way to get to the end is to throw everything out and start over.

12. There is never a single right solution. There are always multiple wrong ones, though.

13. Design is based on requirements. There's no justification for designing something one bit "better" than the requirements dictate.

14. (Edison's Law) "Better" is the enemy of "good".

15. (Shea's Law) The ability to improve a design occurs primarily at the interfaces. This is also the prime location for screwing it up.

16. The previous people who did a similar analysis did not have a direct pipeline to the wisdom of the ages. There is therefore no reason to believe their analysis over yours. There is especially no reason to present their analysis as yours.

17. The fact that an analysis appears in print has no relationship to the likelihood of its being correct.

18. Past experience is excellent for providing a reality check. Too much reality can doom an otherwise worthwhile design, though.

19. The odds are greatly against you being immensely smarter than everyone else in the field. If your analysis says your terminal velocity is twice the speed of light, you may have invented warp drive, but the chances are a lot better that you've screwed up.

20. A bad design with a good presentation is doomed eventually. A good design with a bad presentation is doomed immediately.

21. (Larrabee's Law) Half of everything you hear in a classroom is crap. Education is figuring out which half is which.

22. When in doubt, document. (Documentation requirements will reach a maximum shortly after the termination of a program.)

23. The schedule you develop will seem like a complete work of fiction up until the time your customer fires you for not meeting it.

24. It's called a "Work Breakdown Structure" because the Work remaining will grow until you have a Breakdown, unless you enforce some Structure on it.

25. (Bowden's Law) Following a testing failure, it's always possible to refine the analysis to show that you really had negative margins all along.

26. (Montemerlo's Law) Don't do nuthin' dumb.

27. (Varsi's Law) Schedules only move in one direction.

28. (Ranger's Law) There ain't no such thing as a free launch.

29. (von Tiesenhausen's Law of Program Management) To get an accurate estimate of final program requirements, multiply the initial time estimates by pi, and slide the decimal point on the cost estimates one place to the right.

30. (von Tiesenhausen's Law of Engineering Design) If you want to have a maximum effect on the design of a new engineering system, learn to draw. Engineers always wind up designing the vehicle to look like the initial artist's concept.

31. (Mo's Law of Evolutionary Development) You can't get to the moon by climbing successively taller trees.

32. (Atkin's Law of Demonstrations) When the hardware is working perfectly, the really important visitors don't show up.

33. (Patton's Law of Program Planning) A good plan violently executed now is better than a perfect plan next week.

34. (Roosevelt's Law of Task Planning) Do what you can, where you are, with what you have.

35. (de Saint-Exupery's Law of Design) A designer knows that he has achieved perfection not when there is nothing left to add, but when there is nothing left to take away.

36. Any run-of-the-mill engineer can design something which is elegant. A good engineer designs systems to be efficient. A great engineer designs them to be effective.

37. (Henshaw's Law) One key to success in a mission is establishing clear lines of blame.

38. Capabilities drive requirements, regardless of what the systems engineering textbooks say.

39. Any exploration program which "just happens" to include a new launch vehicle is, de facto, a launch vehicle program.

39. (alternate formulation) The three keys to keeping a new human space program affordable and on schedule:
       1)  No new launch vehicles.
       2)  No new launch vehicles.
       3)  Whatever you do, don't develop any new launch vehicles.

40. (McBryan's Law) You can't make it better until you make it work.

41. There's never enough time to do it right, but somehow, there's always enough time to do it over.

42. Space is a completely unforgiving environment. If you screw up the engineering, somebody dies (and there's no partial credit because most of the analysis was right...)


Source: http://spacecraft.ssl.umd.edu/akins_laws.html
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General / Re: [ANN] Coinmix - the first Bitcoin Cash coin mixer
« Last post by NxtChg on April 28, 2018, 02:08:49 pm »
Coinmix will replace investors with paying dividends to anybody who holds at least 0.01 BCH in their Coinmix wallet.

If you login into your wallet, you should see earned amount (if not - clear the browser cache and refresh the page).

More info in the FAQ.
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Meta / Re: A new forum?
« Last post by wizzardTim on April 25, 2018, 07:26:49 pm »
I like the IOTA forum, I think it is open source, because I remember seeing it somewhere else too (https://forum.iota.org).

https://hellboundbloggers.com/free-open-source-forums/6892/ Maybe it's number 3?

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General / Re: [ANN][SIM] Simcoin - A Simple Coin
« Last post by vader on April 24, 2018, 06:11:38 pm »
hi guys, back again after a few years. did i miss something?  ;D

thank you nxtchg for helping with my old account.
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Meta / Re: A new forum?
« Last post by NxtChg on April 23, 2018, 04:39:58 pm »
Can't we just use Reddit..?

Reddit is not exactly a forum...

Forums been around for a few decades now and it still feels like there is a great room for improvement. Yet everyone keeps repeating the same design over and over again, so they all continue to suck.
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Meta / Re: A new forum?
« Last post by Titulaer on April 23, 2018, 03:19:35 pm »
It's nice that sites like reddit provide a platform for discussions, not sure if something like this is available for forums.

Can't we just use Reddit..?

It would also be nice to export all existing posts from here and move there. And also to have a federated protocol that allows moving data to another server easily or creating a mirror server for backup. Maybe some good open-source engine?

It's probably possible to write a simple program that parses the SMF data and posts it to Reddit using the Reddit API. Reddit data can also be exported.

Anyone knows something like this? Other ideas?

http://getaether.net looks interesting, but it seems it is "community moderated" and it is not web-based. I'm not sure if that's something you want.

Having both Reddit and Slack (or a clone) is probably enough.
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General / Re: [ANN][SIM] Simcoin - A Simple Coin
« Last post by NxtChg on April 23, 2018, 01:05:57 pm »
Who decides about the locking of accounts? Senators?

Initial accounts will be locked by me before release.

Anyone can lock their own accounts and also anyone will probably be able to assign a special status to their accounts, which will require senate vote to send txs from it.

Are you not afraid of sockpuppets and other forms of corruption? And don't you think people will disapprove the centralized aspect of using just a few people who can make decisions?

The whole point of PoS is to avoid Sybil attacks by using stake.

And I don't see any problem with representative democracy, indeed I think it's superior to popular vote.

If we had an unelected politburo, that would be a problem; instead you will be free to delegate your stake to whomever you think represents your interests best.

Does that mean SimToy will use the DPoS mechanism for consensus?

I am not yet sure about that. I was against DPoS before and am still mostly against it. Delegation solves the problem of limited stake in nodes, but on the other hand increases the risk and also allows people to monetize their power. So still thinking about this... For now power can only be delegated to senators.

Can non-senators submit proposals as well?

There are no proposals. The only power senators have is to send txs from Genesis accounts (and any other with the special status).

This allows them to spend Genesis money and to recall account statuses, for example revoke the NODE status in case a node is proven to be malicious. They can also change some system variables that are stored in the ledger.

Will you create a separate 'ANN' post for SimToy?

I view SimToy as v1.0 of Simcoin. It will eventually be improved to match the original Simcoin specs.
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General / Re: [ANN][SIM] Simcoin - A Simple Coin
« Last post by Titulaer on April 23, 2018, 12:42:14 pm »
I've got some questions:

So I've implemented time locks: now any account can be locked for a certain period of time with unspendable amount and a spending rate (max 42 M SIM / day).

Who decides about the locking of accounts? Senators?

In addition to that, txs from Genesis will require approval of one or more "senators" - elected accounts with delegated stake. They will decide when to spend, how much and which account to forward the money to. To approve Genesis tx a certain quorum of senators must co-sign it.

Are you not afraid of sockpuppets and other forms of corruption? And don't you think people will disapprove the centralized aspect of using just a few people who can make decisions?

This will allow you to delegate your stake to whomever you think represents your interests best. Senators power should probably be limited, for example they won't be able to block any money transfers or accounts.

Does that mean SimToy will use the DPoS mechanism for consensus?

Can non-senators submit proposals as well?

---

Will you create a separate 'ANN' post for SimToy?
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Meta / A new forum?
« Last post by NxtChg on April 22, 2018, 09:57:43 pm »
We probably need a new forum for Simcoin. It shouldn't be hosted by a single person.


It's nice that sites like reddit provide a platform for discussions, not sure if something like this is available for forums.

It would also be nice to export all existing posts from here and move there. And also to have a federated protocol that allows moving data to another server easily or creating a mirror server for backup. Maybe some good open-source engine?

Anyone knows something like this? Other ideas?
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General / Re: [ANN][SIM] Simcoin - A Simple Coin
« Last post by NxtChg on April 22, 2018, 08:09:28 am »
Although I said that there will be no Account Control in v1.0, we still need some mechanism to deal with the supply problem.

So I've implemented time locks: now any account can be locked for a certain period of time with unspendable amount and a spending rate (max 42 M SIM / day).

In addition to that, txs from Genesis will require approval of one or more "senators" - elected accounts with delegated stake. They will decide when to spend, how much and which account to forward the money to. To approve Genesis tx a certain quorum of senators must co-sign it.

Txs from Genesis account will have additional powers, for example they will allow senators to revoke any NODE status in case some node starts misbehaving.

The initial idea was to allow direct governance by popular vote, but this is both overly complicated and not particularly wise. So the new idea is to use representative democracy with senators.

This will allow you to delegate your stake to whomever you think represents your interests best. Senators power should probably be limited, for example they won't be able to block any money transfers or accounts.

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