Just as I am crunching down on my last bunch of some 40 odd bugs to make it for the release such news stories come as a welcome day dream. I am sure there are products where you could edit source code while running and the running code dynamically responds to code changes.
But the most difficult bugs are not the crashes or randomization introduced by the thread completion order. What is difficult is the bug that happens after several hours of computation. Longer it takes for the bug to manifest itself, harder it is to debug. Of course it is my luck I end up with coding for such products. Not that I am complaining. It needs a special skill have such products humming along, and it takes a long time on the job to develop it. The pay, benefits and job security are good. So I am not threatened...
BRB
What Bob? Boss wants to see me? Why is she having these gentlemen from security and the HR blond boy with her?
No slide out keyboard. Not all people want it. But many do. Something new like a texting glove that connects via blue tooth is a better idea. Basically each finger has three hot spots. Either the tip of the thumb or the "heel" of the tumb touches the hot spots. Gives you 24 different keys. Since you dont have to look at the glove-keypad at all, you only look at the screen and teach yourself to type with this keyboard.
At some point people might prefer two of these gloves and a trackpad to regular key board and mouse for desktops.
Patent trolls, this is prior art if someone has not already patented this.
You read any issue of popular science or popular mechanics 50 years ago. All the science fictiony futuristic thingies have come true on the electrical side. TV that hangs like a picture on the wall? Done. Video phones? Done. The entire knowledge of human race at your fingertips? Done. (Though a little disappointed 50% of the knowledge of human race consists of cat videos).
Now on the mech engineering side. Where is my commuter car-plane that is parked on my drive way? huh? What about the high speed trains running in vacuum tunnels going from NY to LA in 90 minutes? Still the same internal combustion engine burning the same damned oil. What happened to crystallic fusion? Dont tell me "aah, we got double As".
Civil, you are not off the hook either. Where the hell is my damned home that is mounted on a pivot that tracks the sun? All engineering fields except electronics have been slacking on the job and have a very disappointing track record.
Yes, we could demand more. But we keep electing politicians who are bought by these monopolies. Many states have enacted laws prohibiting the municipalities with crappy service from these monopolies from creating their own broadband network.
The brain is real, but not alive. MRI works on living brains, but usually still pictures. Functional MRI gives movies of activity on living brains, but at a lower resolution. This technique carefully washes away some parts of the brain leaving the fat cells, neurons etc intact. Then they apply electric current and study the connectivity.
For this technology to work the user should have some minimal detectable level of brain activity. So it is going to be totally useless to our congress critters and they would outlaw anything that is not personally useful to them.
I don't see how putting five blades on the front and one more blade at the back and slightly above is going to improve things much. Going from two blades to five, increases the efficiency, I can see. Each stroke is like five strokes using a straight-edge. But at this point we are beyond the optimum in the law of marginal returns.
Imagine building building out a structure about 2 inches in diameter and about a foot or two in length. It is made up of buckyballs, made of rubber walls. Inside of the balls are filled with a magnetized fluid, some kind of polymer that reacts to magnetic field. When an electric field is applied all these polymers curl up tight and become small in volume. when it is removed they will allow themselves to be stretched out. That would be the artificial muscle, with ability to pull in and allow itself to be stretched out.
Use two routers. The turn wi-fi on both. Give the password to the outer router to your guests and ask them to BYOC, bring your own computers. Use the second router, the inner one, to run your home network. Close all the ports and be very secure on the second router. Tell your guests your PC has a virus and so you don't want others connecting to it or using it till you get some help to disinfect it.
Yeah, most of us will sneer at a machine that has all the limitations of iPad with none of its chic factor. Chromebooks look as dory and antidiluvian as a netbook. And it works only when there is a connection to the net. But...
Most people are not like a typical slashdot reader. They have been plunking down cash for tower cases and expansion bays and 99% of the tower cases finish their life without the users ever upgrading/expanding anything. Most people use a puny 4 inch screen to get to the net via mobile phone networks. The number of poor people, minorities, migrants whose sole internet access comes from the smartphone dwarfs slashdot audience. They access the net, and that all they do. They don't edit photos, or videos, they don't rip mp3 from CDs, they don't write any document more complex than a letter, they would not know a presentation software if it came and bit them in their tail. For them chromebook, with a tethered smartphone is all they need.
But it will adequately serve as the second or the third internet device for anyone and will be a great boon as the primary internet device for lots of people. I bought one a month ago. I know it can edit google drive documents and presentatins off line. It can view spreadsheets off line. It can play back all kinds of media stored in the local drive back video and audio. Already read it later off line apps are there. Soon they will mature to a point where I can set up a cron job to download content overnight and watch it in the bus during commute completely off line. good enough.
None of the discussions today broke 3 digits on comments. Try something like this again, I am not coming back. Stupid rot13 trick. Whoever came up with the idea of running it this long should be fired summarily.
I have encrypted this posting using a very secret cypher known only to me. But I have a revolutionary break through and I can exchange information with strangers who might not have my key, public or private. Basically I encrypt it using XOR scheme, get this, TWICE! It has been encrypted twice, ok so this must be secure.
Yes, there are a few documented cases of college drop outs making outstanding projects and products. It is just anecdotal evidence. It means nothing and it does not help you hire the next Steve Jobs. Millions of college drop outs have joined companies, thousands of them in tech companies just when they were budding out. Very few of them made the cut.
If your plan for success is to find the next Steve Jobs and con him into a deal where he does the work and you get the profits, wake up and smell the coffee. It would be easier for you to become a Steve Jobs than to hire one.
OK, let us say that you are one of the thousands of "little plastic sticker for you forehead" makers who hawks the "Padmini Bindis, the Best Bindi for your forehead". And you are looking for some kind of free publicity and a brand distinction from all other bindi makers. Wouldn't you be tempted to sue Apple, just for the sake of publicity? Not saying Padmini sandals or Padmini ice cream cones or Padmini costermongers and blood orange purveyors would have a case. But wouldn't they be tempted?
There must tons and tons of products and registered trademarks around the name Padmini in India. An actress Padmini (no lastname) is the top hit for Padmini in google. I know at least one car model was named Padmini. Every town will have a cafe or a grocery store or a hotel (lodge in local parlance) named Padmini. So I would not be surprised if some one there challenges iPad mini as "too similar to my registered brand name" there. Even if the case has no merit someone might sue just for the publicity or with some hope of reaching a settlement with a multinational company with deep pockets.
I too come fram CFD side and gone to the wrong side of the (electromagnetic) force;-). CFD formulation is inherently parallel, all grid points can be update for the next step simultaneously, and each grid point has a very limited domain of dependency, update computation is relatively simple just mass, momentum and energy conservation, and the unknowns are simply two scalars (density, pressure) and one real vector (momentum). But the CFL condition and turbulence takes away all these benefits and makes life extremely hard for the CFD people.
CEM (computational electro magnetics) is linear, the biggest advantage. But the users want broad spectrum response, so you need to solve it in frequency domain. Each degree of freedom consists of two complex vectors. Formulation is a bitch, almost always a Galerkin. Matrix becomes rank deficient after you remove the null space of the curl vector from the equation. That means the memory hogging L-U decomp.
If I come across as a guy with a chip on the shoulder it is because of the sneering by CFD specialists laughing at our million tet meshes. A million tet mesh in CFD would get about 200K finite volumes after the median dual, get you about 1million scalar unknowns (x,y,z momentum, pressure and density). A million tet CEM mesh would get 20 million complex vectors as unknowns (H1 curl formulation), or 120 million components (x,y,z real & imaginary). And we have to do it L-U decomp, while CFD runs along in time marching on GPUs.
All I am saying is, yes, CFD's life is a bitch. But our life is bitchier.
"We've developed a completely new analysis method, called Babinet-BPM. Compared with the usual FDTD method, the computation speed is 325 times higher, but it only consumes 1/16 of the memory. This is the result of a three-hour calculation by the FDTD method. We achieved the same result in just 36.9 seconds."
What I don't get is calling the FDTD (finite difference time domain) analysis as the "usual" method. It is the usual method in fluid mechanics. But in computational electromagnetics finite element methods have been in use for a long time, and they beat FDTD methods hollow. The basic problem in FDTD method is that, to get more accurate results you need a finer grids. But finer grids also force you to use finer time steps. Thus if you halve the grid spacing, the computational load goes up by a factor of 16. It is known as the tyranny of the CFL condition. The finite element method in frequency domain does not have this limitation and it scales as O(N^1.5) or so. (FDTD scales by O(N^4)). It is still a beast to solve, rank deficient matrix, low condition numbers,
needs a full L-U decomposition, but still, FEM wins over FDTD because of the better scaling.
The technique mentioned here seems to be a variant of boundary integral method, usually used in open domains, and multiwavelength long solution domains. I wonder if FEM can crack this problem.
Lt Fletcher Christian, deputy to Captain William Bligh, commander of HMS Bounty, was the leader of mutineers of the Bounty. Interesting coincidence if there is another Christian on board on the replica. Was he a descendant?
Buddy, if you are going to use anecdotal evidence in an argument, you are probably not best qualified to find fault with that study. Not saying that study is good, just saying, you probably don't have the standing to make that accusation.
I work for a S&P mid cap company, heavily into science and engineering. I am not doing bad myself, holding on to a tiny fiefdom in the corporate empire. But my batch mate in my college went into academics, the usual Ph D, post-doc, tenure-track professorship. Did some serious original research, published some good papers and made a name for himself. Surprised to see him appointed as a director to my own company. So it is not all nepotism and dynastic mutual back scratching societies there. This Indian immigrant with absolutely no connections made it to the lofty realms of directorships.
Slashdot Mirror
Examples: California Candor, Dwarf Alberta Spruce, American Redwood, Canadian Maple
African killer bees, African land snails, West Nile virus, Madras eye, Burmese python
But the most difficult bugs are not the crashes or randomization introduced by the thread completion order. What is difficult is the bug that happens after several hours of computation. Longer it takes for the bug to manifest itself, harder it is to debug. Of course it is my luck I end up with coding for such products. Not that I am complaining. It needs a special skill have such products humming along, and it takes a long time on the job to develop it. The pay, benefits and job security are good. So I am not threatened ...
BRB
What Bob? Boss wants to see me? Why is she having these gentlemen from security and the HR blond boy with her?
At some point people might prefer two of these gloves and a trackpad to regular key board and mouse for desktops.
Patent trolls, this is prior art if someone has not already patented this.
Now on the mech engineering side. Where is my commuter car-plane that is parked on my drive way? huh? What about the high speed trains running in vacuum tunnels going from NY to LA in 90 minutes? Still the same internal combustion engine burning the same damned oil. What happened to crystallic fusion? Dont tell me "aah, we got double As".
Civil, you are not off the hook either. Where the hell is my damned home that is mounted on a pivot that tracks the sun? All engineering fields except electronics have been slacking on the job and have a very disappointing track record.
Yes, we could demand more. But we keep electing politicians who are bought by these monopolies. Many states have enacted laws prohibiting the municipalities with crappy service from these monopolies from creating their own broadband network.
The brain is real, but not alive. MRI works on living brains, but usually still pictures. Functional MRI gives movies of activity on living brains, but at a lower resolution. This technique carefully washes away some parts of the brain leaving the fat cells, neurons etc intact. Then they apply electric current and study the connectivity.
They say the cake is not yours to begin with, since they only leased the cake to you not sold it.
For this technology to work the user should have some minimal detectable level of brain activity. So it is going to be totally useless to our congress critters and they would outlaw anything that is not personally useful to them.
Wait, you are talking about Gillett, aren't you?
Imagine building building out a structure about 2 inches in diameter and about a foot or two in length. It is made up of buckyballs, made of rubber walls. Inside of the balls are filled with a magnetized fluid, some kind of polymer that reacts to magnetic field. When an electric field is applied all these polymers curl up tight and become small in volume. when it is removed they will allow themselves to be stretched out. That would be the artificial muscle, with ability to pull in and allow itself to be stretched out.
Use two routers. The turn wi-fi on both. Give the password to the outer router to your guests and ask them to BYOC, bring your own computers. Use the second router, the inner one, to run your home network. Close all the ports and be very secure on the second router. Tell your guests your PC has a virus and so you don't want others connecting to it or using it till you get some help to disinfect it.
Electronics manufacturers routinely use milli inch = 1/1000 of inch. I think kilo pound is also common to avoid inconsistent definitions of ton.
Most people are not like a typical slashdot reader. They have been plunking down cash for tower cases and expansion bays and 99% of the tower cases finish their life without the users ever upgrading/expanding anything. Most people use a puny 4 inch screen to get to the net via mobile phone networks. The number of poor people, minorities, migrants whose sole internet access comes from the smartphone dwarfs slashdot audience. They access the net, and that all they do. They don't edit photos, or videos, they don't rip mp3 from CDs, they don't write any document more complex than a letter, they would not know a presentation software if it came and bit them in their tail. For them chromebook, with a tethered smartphone is all they need.
But it will adequately serve as the second or the third internet device for anyone and will be a great boon as the primary internet device for lots of people. I bought one a month ago. I know it can edit google drive documents and presentatins off line. It can view spreadsheets off line. It can play back all kinds of media stored in the local drive back video and audio. Already read it later off line apps are there. Soon they will mature to a point where I can set up a cron job to download content overnight and watch it in the bus during commute completely off line. good enough.
Was it done by Steve Balmer or done to Steve Balmer? That is the question.
And I'm sorry you have to use LU decomposition, a 55 year old algorithm. No idea why you "have to", but okay. Also...
Actually we don't. Our matrix inversion is done with multifrontal matrix solver running on GPUs.
None of the discussions today broke 3 digits on comments. Try something like this again, I am not coming back. Stupid rot13 trick. Whoever came up with the idea of running it this long should be fired summarily.
I have encrypted this posting using a very secret cypher known only to me. But I have a revolutionary break through and I can exchange information with strangers who might not have my key, public or private. Basically I encrypt it using XOR scheme, get this, TWICE! It has been encrypted twice, ok so this must be secure.
If your plan for success is to find the next Steve Jobs and con him into a deal where he does the work and you get the profits, wake up and smell the coffee. It would be easier for you to become a Steve Jobs than to hire one.
OK, let us say that you are one of the thousands of "little plastic sticker for you forehead" makers who hawks the "Padmini Bindis, the Best Bindi for your forehead". And you are looking for some kind of free publicity and a brand distinction from all other bindi makers. Wouldn't you be tempted to sue Apple, just for the sake of publicity? Not saying Padmini sandals or Padmini ice cream cones or Padmini costermongers and blood orange purveyors would have a case. But wouldn't they be tempted?
There must tons and tons of products and registered trademarks around the name Padmini in India. An actress Padmini (no lastname) is the top hit for Padmini in google. I know at least one car model was named Padmini. Every town will have a cafe or a grocery store or a hotel (lodge in local parlance) named Padmini. So I would not be surprised if some one there challenges iPad mini as "too similar to my registered brand name" there. Even if the case has no merit someone might sue just for the publicity or with some hope of reaching a settlement with a multinational company with deep pockets.
CEM (computational electro magnetics) is linear, the biggest advantage. But the users want broad spectrum response, so you need to solve it in frequency domain. Each degree of freedom consists of two complex vectors. Formulation is a bitch, almost always a Galerkin. Matrix becomes rank deficient after you remove the null space of the curl vector from the equation. That means the memory hogging L-U decomp.
If I come across as a guy with a chip on the shoulder it is because of the sneering by CFD specialists laughing at our million tet meshes. A million tet mesh in CFD would get about 200K finite volumes after the median dual, get you about 1million scalar unknowns (x,y,z momentum, pressure and density). A million tet CEM mesh would get 20 million complex vectors as unknowns (H1 curl formulation), or 120 million components (x,y,z real & imaginary). And we have to do it L-U decomp, while CFD runs along in time marching on GPUs.
All I am saying is, yes, CFD's life is a bitch. But our life is bitchier.
"We've developed a completely new analysis method, called Babinet-BPM. Compared with the usual FDTD method, the computation speed is 325 times higher, but it only consumes 1/16 of the memory. This is the result of a three-hour calculation by the FDTD method. We achieved the same result in just 36.9 seconds."
What I don't get is calling the FDTD (finite difference time domain) analysis as the "usual" method. It is the usual method in fluid mechanics. But in computational electromagnetics finite element methods have been in use for a long time, and they beat FDTD methods hollow. The basic problem in FDTD method is that, to get more accurate results you need a finer grids. But finer grids also force you to use finer time steps. Thus if you halve the grid spacing, the computational load goes up by a factor of 16. It is known as the tyranny of the CFL condition. The finite element method in frequency domain does not have this limitation and it scales as O(N^1.5) or so. (FDTD scales by O(N^4)). It is still a beast to solve, rank deficient matrix, low condition numbers, needs a full L-U decomposition, but still, FEM wins over FDTD because of the better scaling.
The technique mentioned here seems to be a variant of boundary integral method, usually used in open domains, and multiwavelength long solution domains. I wonder if FEM can crack this problem.
Lt Fletcher Christian, deputy to Captain William Bligh, commander of HMS Bounty, was the leader of mutineers of the Bounty. Interesting coincidence if there is another Christian on board on the replica. Was he a descendant?
Buddy, if you are going to use anecdotal evidence in an argument, you are probably not best qualified to find fault with that study. Not saying that study is good, just saying, you probably don't have the standing to make that accusation.
I work for a S&P mid cap company, heavily into science and engineering. I am not doing bad myself, holding on to a tiny fiefdom in the corporate empire. But my batch mate in my college went into academics, the usual Ph D, post-doc, tenure-track professorship. Did some serious original research, published some good papers and made a name for himself. Surprised to see him appointed as a director to my own company. So it is not all nepotism and dynastic mutual back scratching societies there. This Indian immigrant with absolutely no connections made it to the lofty realms of directorships.