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11
I'm just not seeing the reason for it to discharge through the top diode. It should charge, that's fine, but then what makes the voltage drop so the charge can flow out again?
12
Well, the title of this thread says something. Something crazy is going on.

Ok the charge is coming in, going out, one is fast, one is faster (or slow), but what about the amount? For example leggy can lift very slowly but the amount it hits your but is really strong...
13
General Hardware Talk / Re: Something crazy is happening to me with my work
« Last post by ranch vermin on August 20, 2018, 01:10:22 pm »
14
Robotics News / A "GPS for inside your body"
« Last post by Tyler on August 20, 2018, 12:00:55 pm »
A "GPS for inside your body"
20 August 2018, 5:00 am

Investigating inside the human body often requires cutting open a patient or swalloing long tubes with built-in cameras. But what if physicians could get a better glimpse in a less expensive, invasive, and time-consuming manner?

A team from MIT’s Computer Science and Artificial Intelligence Laboratory (CSAIL) led by Professor Dina Katabi is working on doing exactly that with an “in-body GPS" system dubbed ReMix. The new method can pinpoint the location of ingestible implants inside the body using low-power wireless signals. These implants could be used as tiny tracking devices on shifting tumors to help monitor their slight movements.

In animal tests, the team demonstrated that they can track the implants with centimeter-level accuracy. The team says that, one day, similar implants could be used to deliver drugs to specific regions in the body.

ReMix was developed in collaboration with researchers from Massachusetts General Hospital (MGH). The team describes the system in a paper that's being presented at this week's Association for Computing Machinery's Special Interest Group on Data Communications (SIGCOMM) conference in Budapest, Turkey.

Tracking inside the body

To test ReMix, Katabi’s group first implanted a small marker in animal tissues. To track its movement, the researchers used a wireless device that reflects radio signals off the patient. This was based on a wireless technology that the researchers previously demonstrated to detect heart rate, breathing, and movement. A special algorithm then uses that signal to pinpoint the exact location of the marker.

Interestingly, the marker inside the body does not need to transmit any wireless signal. It simply reflects the signal transmitted by the wireless device outside the body. Therefore, it doesn't need a battery or any other external source of energy.

A key challenge in using wireless signals in this way is the many competing reflections that bounce off a person's body. In fact, the signals that reflect off a person’s skin are actually 100 million times more powerful than the signals of the metal marker itself.

To overcome this, the team designed an approach that essentially separates the interfering skin signals from the ones they're trying to measure. They did this using a small semiconductor device, called a “diode,” that mixes signals together so the team can then filter out the skin-related signals. For example, if the skin reflects at frequencies of F1 and F2, the diode creates new combinations of those frequencies, such as F1-F2 and F1+F2. When all of the signals reflect back to the system, the system only picks up the combined frequencies, filtering out the original frequencies that came from the patient’s skin.

One potential application for ReMix is in proton therapy, a type of cancer treatment that involves bombarding tumors with beams of magnet-controlled protons. The approach allows doctors to prescribe higher doses of radiation, but requires a very high degree of precision, which means that it’s usually limited to only certain cancers.

Its success hinges on something that's actually quite unreliable: a tumor staying exactly where it is during the radiation process. If a tumor moves, then healthy areas could be exposed to the radiation. But with a small marker like ReMix’s, doctors could better determine the location of a tumor in real-time and either pause the treatment or steer the beam into the right position. (To be clear, ReMix is not yet accurate enough to be used in clinical settings. Katabi says a margin of error closer to a couple of millimeters would be necessary for actual implementation.)

"The ability to continuously sense inside the human body has largely been a distant dream," says Romit Roy Choudhury, a professor of electrical engineering and computer science at the University of Illinois, who was not involved in the research. "One of the roadblocks has been wireless communication to a device and its continuous localization. ReMix makes a leap in this direction by showing that the wireless component of implantable devices may no longer be the bottleneck."

Looking ahead

There are still many ongoing challenges for improving ReMix. The team next hopes to combine the wireless data with medical data, such as that from magnetic resonance imaging (MRI) scans, to further improve the system’s accuracy. In addition, the team will continue to reassess the algorithm and the various tradeoffs needed to account for the complexity of different bodies.

"We want a model that's technically feasible, while still complex enough to accurately represent the human body," says MIT PhD student Deepak Vasisht, lead author on the new paper. "If we want to use this technology on actual cancer patients one day, it will have to come from better modeling a person's physical structure."

The researchers say that such systems could help enable more widespread adoption of proton therapy centers. Today, there are only about 100 centers globally.

"One reason that [proton therapy] is so expensive is because of the cost of installing the hardware," Vasisht says. "If these systems can encourage more applications of the technology, there will be more demand, which will mean more therapy centers, and lower prices for patients."

Katabi and Vasisht co-wrote the paper with MIT PhD student Guo Zhang, University of Waterloo professor Omid Abari, MGH physicist Hsaio-Ming Lu, and MGH technical director Jacob Flanz.

Source: MIT News - CSAIL - Robotics - Computer Science and Artificial Intelligence Laboratory (CSAIL) - Robots - Artificial intelligence

Reprinted with permission of MIT News : MIT News homepage



Use the link at the top of the story to get to the original article.
15
XKCD Comic / XKCD Comic : Dark Matter Candidates
« Last post by Tyler on August 20, 2018, 12:00:55 pm »
Dark Matter Candidates
20 August 2018, 5:00 am

My theory is that dark matter is actually just a thin patina of grime covering the whole universe, and we don't notice it because we haven't thoroughly cleaned the place in eons.

Source: xkcd.com

16
General Hardware Talk / Re: Something crazy is happening to me with my work
« Last post by ranch vermin on August 20, 2018, 11:30:55 am »
Ha! thanks for a quick stab!


Not sure... I can give u a hint tho -> Current goes both ways over the capacitor line, inside the loop,  but its the same everywhere else.  (I know it for a fact im fairly positive on... but this doesnt make sense to me.)

Ive got some more crazy info, with a slightly different circuit - and i dont understand my 0 amps over the capacitor!!!  it should be reacting as if it wasnt there and just pumping amps through, because of the fork stopping half the charge, and the discharge loop giving 100%,  through the same amount of resistors,  the discharge should be heavier than the charge discounting the capacitor being there.

But no,  im getting no charge at all through the tester diodes.    Doesnt make sense!

17
It is discharging, but in the same direction as you charged it. The top diode is not involved then. It wouldn't go the opposite direction than you charged it. The side introduced to new electrons first got more charged because the resistor made a voltage gap. Right?
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General Hardware Talk / Something crazy is happening to me with my work
« Last post by ranch vermin on August 20, 2018, 07:48:41 am »
So!
How do I start to explain this!  Im very frustrated.
 


Ive been having a problems ALONG time now!!!    And the electronics is NOT making sense!
So this circuit is supposed to be having the capacitor constantly neutralize through a resistor.   if its neutralizing FASTER than its charging, it should pass current indefinitely,  but its acting as if its not even discharging at all!
If the charge is slightly faster than the discharge, then it should at least slow it down as it fills.

Im going elsewhere with this problem as well,   im getting to the bottom of this CRAP.
20
General AI Discussion / Re: outline from gadient mask
« Last post by yotamarker on August 19, 2018, 03:09:03 pm »
Hy Yotamarker, i want colaborate working in your project, i am study about contour.
please share your Inventor source-code to download and the Yotamarker app source too.
you using only Harris operator?  cheers!



at any rate next stages with the A.I include : finishing the classifier for :
all objects detected, biggest object in region, outer outline, maybe some more attributes
speed up by taking out outline markers,
and using threading :
.net supports threading for loops but java doesn't (as far as I know) so I"ll have to make a decision there.

from there : the road splits for vb (connect to cam) and java : translate vb code + get code walkthroughs for getting cam images and
pixel attributes (RGB / HCL) and applying it to a service.

therefore I didn't have much time to work one it I was making these grimoire :
https://www.yotamarker.com/t155-android-mobile-app-dev-apk
and some more. BTW Xamarin is so dead  >:D  :knuppel2:

you got my PM ?
Pages: 1 [2] 3 4 ... 10

Something crazy is happening to me with my work
by ranch vermin (General Hardware Talk)
Today at 06:17:29 am
XKCD Comic : Dark Matter Candidates
by Tyler (XKCD Comic)
August 20, 2018, 12:00:55 pm
outline from gadient mask
by yotamarker (General AI Discussion)
August 19, 2018, 03:09:03 pm
absolutely nothing motor controller
by ranch vermin (Home Made Robots)
August 19, 2018, 11:49:42 am
Friday Funny
by LOCKSUIT (General Chat)
August 17, 2018, 04:10:47 pm
Ten Commandments of Logic
by RoyMac (General Chat)
August 17, 2018, 12:01:02 pm
XKCD Comic : Equations
by Tyler (XKCD Comic)
August 17, 2018, 12:00:14 pm
XKCD Comic : Repair or Replace
by Tyler (XKCD Comic)
August 16, 2018, 12:01:05 pm

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