Link to Original Source
Link to Original Source
Since I cannot reply to all, I will just reply to myself and perhaps you all will read it.
Digital cameras do a fine job for pretty much all utilitarian photography and to deny that would be foolish.
Having said that, in fine art photography, images where you want a very large amount of latitude, and where color really makes a difference they all still pretty much still stand in the shadow of quality film and quality lenses. If I want shadow detail I have to have some camera that will take three different exposures at three different ISO's then mathematically average them to get a mediocre image at best.
As with most things digital it is a race to mediocrity. Music, Film and most everything else. All the qualities we had with film are now replaced by lies of mathematical tricks to go and invent the latent image in a bit stream where there is no data because digital is slow. Unless you print the image it will be lost. Put a memory stick on a shelf and come back and see if it can still be read 100 years later. There are negatives that have been properly stored that I can make a print from that are over 100 years old. There are book that are over 100 years old that I can still read.
Are as good as a quality film camera loaded with quality film. Maybe one day..
The rise in pedestrian / vehicle / bicycle collisions and the resulting injuries and fatalities need to be addressed and it needs to be addressed as a whole.
Distracted Driving / Distracted Walking / Distracted bicycling all lead to a poor outcome and it is 98% preventable. Unplug and Drive, Unplug and Walk, unplug and cycle. I see so many people walking into an intersection while texting or whatever it is they are doing when staring at their phone when they should be looking to see if they are going to get splattered that it is a small miracle it does not happen more often.
Accelerometers simply enable the estimated speed and direction to be kept up to date. And using that to update position is dead reckoning, as we have both described.
But that is not DR since those accelerometers can account for set and drift, and by definition that is inertial navigation. DR is simply I am at point X NOW and if I go in a direction for n amount of time at a given speed I will be at point Y. There is no interpositional correction.
As a pilot I frequently fly without a GPS, hence to better understand my position ( other then looking down at the ground and matching features to a chart ) I rely on reports of wind speed and direction at various altitudes to change my course so that it is a vector of those winds to arrive at a given point.
From Wikipedia on Automotive Dead Reckoning...
Dead reckoning is today implemented in some high-end automotive navigation systems in order to overcome the limitations of GPS/GNSS technology alone. Satellite microwave signals are unavailable in parking garages and tunnels, and often severely degraded in urban canyons and near trees due to blocked lines of sight to the satellites or multipath propagation. In a dead-reckoning navigation system, the car is equipped with sensors that know the wheel diameter and record wheel rotations and steering direction. These sensors are often already present in cars for other purposes (anti-lock braking system, electronic stability control) and can be read by the navigation system from the controller-area network bus. The navigation system then uses a Kalman filter to integrate the always-available sensor data with the accurate but occasionally unavailable position information from the satellite data into a combined position fix.
This is in principle not inertial navigation, but then again it is not DR in the truest sense of the phrase as it was recognized in navigation. We can call it something else, we can call it lots of things but it is not, imho, DR because the the nav system in the car is constantly updating a position based upon speed and direction of travel. This is a hybrid of inertial and DR so call it something else, just don't call it DR because the cars system is trying to obtain a fix ever second or so. I think it is great that they are trying to do these things, but I also value calling something what it is and not something that it is not.
As the poster correctly points out there is a large difference.
Inertial Navigation is where you have a set of gyro's and accelerometers measuring your movement in 3 dimensions for aircraft and submarines and in two dimensions for land based vehicles, which in turn is used to update your position based upon an initial position fix ( or in this case the last fix from the GPS ).
Dead Reckoning is simply, "I have been going on course 213 for the last three hours at 5 knots so I must be here." The difference is that the DR cannot take into account set and drift and the accuracy of speed measurement is quite important.
OK, now lets take a cars NAV system. If it is a typical device it is has pretty much the entire road map loaded as a set of links and nodes with background tiles that are pre-rendered for the given zoom levels it is designed to support. If it looses contact with the satellite it is pretty much just plain lost, now throw in a fairly accurate gyro and set of accelerometers and when the satellite signal goes bye bye you flip over to inertial navigation which can be made pretty accurate since given the fact that cars generally stay on known roads you can then perform path inference based upon the on board map so that if the inertial system seems to think you are driving through a building the system can correct itself by looking at where it has been and put you position back on the road where you should be.
So the summary is quite miss leading because the editor does not know the difference or the sales weenie from the company thought that "Dead Reckoning" sounded cool.
If you did you are / were a complete fool and here is why...
Our government, believe it or not, generally acts in the best interest of us. How do I know this? Because at a time in my life I worked for it.
You can site all of the lobbying abuses, sweetheart deals, back room dealing, etc. etc. but the general thrust of your argument would still be wrong
Senator A votes to have deal B go through and for the most part he does it for two reasons, re-election money or to get a project / company / entity to do business in his or her state because fundamentally his interests generally align with the people who elected him or her to office.
When it comes to national security everyone had a total freak out when a bunch of guys from Saudi Arabia flew airliners full of people into buildings. Was the NSA kinda clueless? Maybe, were our politicians? Very much so, so they did what all politicians do, they gave an agency carte blanche and looked the other way while saying you had damn well better cover our asses from here on out..
What is really funny about this, is that the so called "Meta Data" is noting more than your phone bill. Ah but the chink in the armor are phones you can buy with a prepaid sim in them for cash. You don't know who made a call you just know that a call was made, so even that data is hard to deal with because you actually have to track the device down, put some eyes on the ground and search for 1 person out of the population of [insert large metropolitan area here ] to see who is using that phone. I think we could go a long way towards prevention of bad things my outlawing them. You want to buy a pre-paid cell phone, fine, we scan your photo ID so at least we have a picture of the person or perhaps a finger print. Do that and we catch half of the gang bangers tomorrow.
You see I really don't care who knows the number I made a call to or got a call from, what I do care about is them knowing the content of the call, and I am not even sure the new data center in Utah could hold all audio from every call made. What this is really is know if two baddies are talking to each other, or a baddie is calling a guy who works for the FAA, an airline, a company that manufactures chemicals that can be made into explosives, etc. you get the idea.
As to Diane Feinstein I think she should have to register as a foreign agent of Israel since she their US lobbying arm. I used to vote for her but have voted against in the last two senatorial elections and I am a Democrat!
I have found that Navteq -> Nokia -> Here have the best maps AND the best Link / Node sources.
Google just plain sucks because you have to feed from their API but they do have damn accurate maps, as to their routing engine well...
OSM is pretty good but the level of cruft is quite high and takes a LOT of work to make it usable so...
What do you mean "stealing"? The plans for cryogenic engines have been all over the internet for a long time now. The basic technology of the original F1 engine from the Apollo program was pretty common knowledge over 10 years ago. You really can't steal a design that has been pretty much open to the public at large. The innovations of the F1 engine were the cooling of the nozzle with the cryogenic fuel and the turbo-pumps, both of which have been pretty well understood for a long time.
Admittedly, scaling them might pose a technical challenge but I don't think it would that hard. The hard stuff was dealing with the shock wave problems that wanted to tear everything apart and even solutions to those problems have been in open scientific journals for a long long time.
Have you ever looked at some of the equipment on the outside of the space station? Most of it is is quite delicate as opposed to oil rigs that are mostly very large steel pipes that you can pound on with a sledge hammer and do very little damage to. Everything on that space station is built as light as possible / practicable because it has to be pushed into orbit by chemical rockets.
Lots and lots of it is behind something else, lots of it has complex cable connections. The more robotics you send up that more and more things have to be designed to be accessed by those robotics and therefor become less compact which on the outside of a space station is not good since there is limited surface area all the crap that must be there to begin with.
They have yet to build anything with as much dexterity ( even in a space suite glove ) as the human hand. They have yet to build camera's that are as good as the human mark 1 mod 0 eyeball at catching sight of something, if even for the briefest of moments and reacting immediately to that, if required.
Quite simply put, there is not a robot built yet that can replace humans doing some of the most delicate and difficult tasks. Think about cross-threading. Even in a space suit you can feel that slight resistance of threads not quite aligned and stop twisting before you mangle them, stop, turn the thing in reverse a bit and feel the threads align and the resume turning the coupling, screw or bolt.
Every day they get closer, but for now there is not a manipulator that can do that. Remember repairing the Hubble and they had trouble with the access door closing? The guy in the suit could feel which section was not aligning correctly and apply pressure in a different vector to get the access door to click into place. I for one would be quite happy if they had a manipulator / robot that could do that since it would not require risking a life to do the work that needs to be done; however, until that day then people in those pesky suits are going to have to put em one, head out of the hatch and play mechanic in a very hostile environment.
Casandra is a key-value store and does not do the things you need like joins and sub-queries. Data stores such as these do have their application sweet spots though. If you don't need critical analysis of relational data these types of programs are pretty cool.
PostGres is a fine DB, but I would guess that your figure is derived from PG being in single user mode and nothing else making demands on it while it was doing that. They do however desperately need to fix the TXID rollover problem since in hi volume data inserts the vacuum process really kills performance. PG has other issues like portability which machine and disk configuration dependencies really put a hurt on, but everything is a trade-off.
I use a smaller drive array that has much faster disks for the things I can fit on them and the performance really goes way way up, but cramming in about 11 million rows a day 24/7/365 just gobbles up storage, so I have to keep it on the big, and much slower disk array.
Keep in mind that while doing all of this the system is servicing the request of many other processes and users, and like most databases we are IO-bound in many instances as the primary storage array spends lots and lots of time running at or very close to 100% utilization. all in all we rarely dip below around 2000 TPS and are often peaking in the area of 6000 to 8000 and we do all of this on a single dell 12 core box w/48G of ram.
One of the many problems is that most people do not know how to tune Oracle. Properly tuned Oracle, even when running on inadequate hardware, oracle can support TPS levels that many DB's only dream about with full ACID as a matter of course on the same hardware. I have watched Postgres, MS-SQL Server and DB2 just hit the floor while Oracle kept chugging right along, not always mind you, but more often then not.
I am currently running 11gR2 on hardware that is at best adequate and can assimilate the entire output of 80% of the state of California's highway loop detectors ( approximately 50,000 raw data rows inserted every 30 seconds 24/7/365 ) and that into a rather poky 15TB drive array with 7500rpm 2TB drives, in raid 5 no less, then query all of that data filter,clean and analyze it and shove that data into another table all in the same 30 second period.
The DMV project was a nightmare of never ending changes of requirements. When you think about the basic project, it aint that hard, but when there is no point at which you could say it was stable because the target just kept moving, I don't care who takes it on or who's DB engine you throw at it, it will fail.
When it comes to scaling something out, you take you best guess at what you load will be. When your prospective load might be a large percentage of 300 million people it is a hard target to pin down and that is what ( along with a few bugs that escaped unit testing ) was their ultimate undoing. No one knows who's DB engine was behind it but I doubt it was any of the "web scale" DB's since they don't support ACID very well and this was one of those when it was absolutely essential.
I will give a person one chance to take them off and put them away around me. If it is a public place that I spend money, I will be polite and ask, "Please put that camera away.", if they refuse, I will go straight to the business owner, tell that that I am leaving and will no longer spend my money in their establishment as long as they allow those things, and leave. If it is in my home, they get the one chance and if they refuse, they will be unceremoniously ejected, if they argue the point, they get my fist right into their google glasses and then they will be thrown ( literately ) out my door and off of my property.
As to the rest, if someone does not have social skills to know that constantly twiddling with their latest toy while in a conversation is just plain fucking RUDE I will make them aware of that and then leave.