hatetolove Posted May 14, 2008 Report Share Posted May 14, 2008 my teacher basically gave us the sheet and told us that it's due for saturday. [currently in the middle east and the school schedule is weird here, saturdays are basically our mondays, sundays our tuesdays, etc] she gave us basically a week and i've gotten no where. i don't know the structure or anything or how i'm going to achieve good marks in the portfolio. i've basically done q1 & 2 but i'm stuck on q3,4,5,6 & 7. can anybody give me any suggestions on how i can do the questions? pls? anybody?thanks in advance, any help will be greatly appreciated and i'll try to find/provide any ib exam papers you might be looking for.MODELLING THE COURSE OF A VIRAL ILLNESS AND ITS TREATMENT HL TYPE II Once again, any help is greatly appreciated. =] Reply Link to post Share on other sites More sharing options...
N00by Posted June 11, 2008 Report Share Posted June 11, 2008 I need help with this too. I just got it from my teacher. I didn't do as well as I hoped for my previous IA so I want to do better for this. Hope people can contribute because I'm really desperate to do well. Reply Link to post Share on other sites More sharing options...
julian_r_p Posted August 27, 2008 Report Share Posted August 27, 2008 question 4 is hard because it's slightly ambiguous...the medication is given through continuous intavenous treatment, hence in a linear functionthe kidneys eradicate 2.5% per hour, but they work continuously, so also linearhence the model is linear huh?but isnt that just too easy?anyone else figured out qu. 4?qus. 1=3 work tho ... people who r having difficulties with 3 (the formula) revide Compound Interest in the geometric series unit .. it helps cos it's a similar thing (changing the rate from a four hour increast to every hour) Reply Link to post Share on other sites More sharing options...
appleme Posted September 7, 2008 Report Share Posted September 7, 2008 Can someone help me out with what the questions are asking?When it says that the kidneys eliminate at 2.5% an hour, do they mean deal with it so that at the end of your 1 hour eliminate 2.5% of whatever you have, or somehow figure out how to make the kidneys eliminate continuous which I have no idea how to do?When it says onset of infection does it mean when the first particle enters the body or when viral count is 10000???When it asks for reliability of the results,parameters (assess criteria)cnstraints (assess criteria)variables (Assess criteriawhat on earth is it asking for?! Reply Link to post Share on other sites More sharing options...
takasta Posted November 27, 2008 Report Share Posted November 27, 2008 Can someone help me out with what the questions are asking?When it says that the kidneys eliminate at 2.5% an hour, do they mean deal with it so that at the end of your 1 hour eliminate 2.5% of whatever you have, or somehow figure out how to make the kidneys eliminate continuous which I have no idea how to do?When it says onset of infection does it mean when the first particle enters the body or when viral count is 10000???When it asks for reliability of the results,parameters (assess criteria)cnstraints (assess criteria)variables (Assess criteriawhat on earth is it asking for?!It really doesn't matter as long as you state it in your report. You can elimeinate 2.5% first then add 1 hour of **** onto it. I did it the other way around, of finding the function of 1 hour then elimnating 2.5%. You start the coutn at 10,000 at 0 hours. This is just a starting point because its impossible to then measure the rate at which the viral particles start entering the body from 0 particles. so yes 10 000 is the number of particles at 0 hours.reliability of results is basically pretty simple. you just have to discuss the strengths and weaknesses of your report obviously of parameters and constarints and varibales. an easy way is then to compare it actual data or actual models to see how the result fits up. A weakness for example would be the much too varaied change between different patients as different people react to medication differently. Different people's immune systems are of different strengths as wellhope that helps. Reply Link to post Share on other sites More sharing options...
SharkSpider Posted December 25, 2008 Report Share Posted December 25, 2008 Mod Edit: All discussion about this IA to take place hereWell, I've started my math HL portfolio assignment, and I've run in to an issue.We have a virus whose cells replicate to 160% per four hours, and an immune system that removes 50000 particles per hour. The idea is to create a function that models the virus, and initially I had:A(t) = A(o)exp(kt)-50000tThe derivative of A(t) is: kA(o)exp(kt)-50000Which is an issue, simply because there's something missing.Anyways, I've gotten a bit stuck on this one, so a bit of help here would be nice. Just looking for the right formula for A(t) so that the rate of change is porportional to a constant times the amount, minus 50000. 1 Reply Link to post Share on other sites More sharing options...
CellarDoor Posted December 25, 2008 Report Share Posted December 25, 2008 You can write this entire portfolio without using calculus once.Try looking for another graph which can also model the situation, maybe using another base... 1 Reply Link to post Share on other sites More sharing options...
mania90 Posted December 26, 2008 Report Share Posted December 26, 2008 Generally the question is pretty much easy: do they want us to concern the matter where kidneys remove 2.5% of the beginning amount medicine every hour or they remove 2.5% of what has left, and so to create a mathematical series for that >? Reply Link to post Share on other sites More sharing options...
CellarDoor Posted December 26, 2008 Report Share Posted December 26, 2008 Think about it. How is the drug entering the body? 1 Reply Link to post Share on other sites More sharing options...
SharkSpider Posted December 29, 2008 Report Share Posted December 29, 2008 Well... I plotted points at some different intervals and used a trendline. Despite wanting to commit suicide due to the inductive-ness of it all, it's looking okay, sort of. Guess the problem was that I did the first question on a purely logical basis, without the error caused by generating data points. If I have time I'll try an infinite series with this question, and see what I can get, but otherwise this should do. 1 Reply Link to post Share on other sites More sharing options...
wei-yin Posted January 18, 2009 Report Share Posted January 18, 2009 So i was given the IA that has to do with "modelling the course of a viral illness and its treatment"and I'm stuck on part 2I've used a differentiable equation dP/dt = kP - 50,000but it's not working out rightanyone can give some advice on how to do this? thanks Reply Link to post Share on other sites More sharing options...
Abu Posted January 18, 2009 Report Share Posted January 18, 2009 There have already been two previous topics on the same portfolio. Please refer to them first, and continue your discussion on the same topic. http://www.ibsurvival.com/forum/index.php?showtopic=4699http://www.ibsurvival.com/forum/index.php?showtopic=4703 1 Reply Link to post Share on other sites More sharing options...
SharkSpider Posted January 18, 2009 Report Share Posted January 18, 2009 If you can't get the differential equation to work then it might be a good idea to develop another model and to plot points, or to use computer software to solve the differential. If you can't explain how you did all of this on your own, you will get penalized for hand waving at a differential equation. Reply Link to post Share on other sites More sharing options...
wei-yin Posted January 18, 2009 Report Share Posted January 18, 2009 but the two before both refer to different parts of the the portfolio. and thus continuing discussion there would hardly be relevant, would it not?sharkspider:thanks for the advicei was asking more about what other methods could i go about to find the modelplotting points and drawing a regression from excel wouldnt get me much points would it?what other ways could the model be found? Reply Link to post Share on other sites More sharing options...
SharkSpider Posted January 18, 2009 Report Share Posted January 18, 2009 Well, I studied differentials for a bit and I did figure out how to solve it, so you could always go in to maple 12 and do it, but I don't know how well that will do. I'm going to state straight up that the function can be modeled with an exponential function, in the form of y = Ae^x + b, so no worries there, but the problem is to find that function. Good luck, I guess. Reply Link to post Share on other sites More sharing options...
smilies Posted January 31, 2009 Report Share Posted January 31, 2009 (edited) I'm doing the same IA and seemed to have hit a wall on part 3... I modelled it as:XXXXXThanks Edited February 3, 2009 by Aboo Please do not exhibit your equation. Reply Link to post Share on other sites More sharing options...
eunjeekim Posted February 7, 2009 Report Share Posted February 7, 2009 (edited) The words are obscure Edited February 7, 2009 by eunjeekim Reply Link to post Share on other sites More sharing options...
ReSpekt Posted February 11, 2009 Report Share Posted February 11, 2009 Hello. I would also like to have help with this Portfolio! For Part one, I used XXXXXFor part two, I don't understand what using a spreadsheet means. I used a piecewise function and obtained XXXXXX. Is this right or am I on the wrong track?Mod Edit: You may not share formulas for possible answers. Im stuck on part 3! I can't find the differential equation! Reply Link to post Share on other sites More sharing options...
slayer845 Posted February 19, 2009 Report Share Posted February 19, 2009 um for the modelling infection Q2 did anyone get t=deleted hours just wondering if im on the right path Reply Link to post Share on other sites More sharing options...
slayer845 Posted February 24, 2009 Report Share Posted February 24, 2009 qus. 1=3 work tho ... people who r having difficulties with 3 (the formula) revide Compound Interest in the geometric series unit .. it helps cos it's a similar thing (changing the rate from a four hour increast to every hour)when you say, "eople who r having difficulties with 3 (the formula) revide Compound Interest in the geometric series unit"...you mean question 4 right...cause 3 doesn't ask you for a model. Reply Link to post Share on other sites More sharing options...
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