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Hi All
I want to simulate an ambient vibration to be used as an input to a Numerical Model. I want this to represent the vibrations occurred to the building through the wind, vehicle/human movement, etc.
The sole purpose of simulating this ambient vibration is to input it to the numerical model in order to find out the natural frequencies, mode shapes and damping ratios of the building through Operational Modal Analysis
Thank you
Hello Navindra,
If your only goal with this simulation is to find the eigen modes/frequencies and damping, a gaussian white noise bandpass filtered to the range of your suspected natural frequencies of interest (e.g. number of floors/10 estimates f0 for buildings) will do the job without fail. The magnitude of the white noise must be sufficient to excite your structure. (usually ~0.2g suffices in my experience for buildings) I suggest using Automated FDD for OMA to ease your calculations.
I hope this helps! Good luck with your research :)
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Hello everyone,
Can you please tell me if we can use Street centre lines downloaded from GIS database (such as Open Street Maps) and use it for Space Syntax analysis?
From my experience, the GIS Street centre lines usually inludes more than 1 line for a street segment. For example, a street can be characterised by 4 lines = 4 lanes, while another is characterised by just 1 line, or 2 lines.
Will this reduce the accuracy of space syntax analysis?
How can we solve this problem?
Many thanks,
Regards
Ha
Hello! Thank you so much for your response and suggestion.
My recent experience with mixing GIS data and Space Syntax analysis is:
1- The lines representing streets in GIS database are too complicated. They are not 'axial lines' that are fewest and longest. This character fails to meet Hiller's concept and definition of a fewest axial line map, which is used to represent a city's street network. The axial line map used for space syntax analysis should be built properly following the 'fewest' and 'longest' principles.
2- I have to: (a) export GIS-origin street map into AutoCAD, (b) revise the map into a proper axial map, keep the original coordinate and projection; (c) run space syntax analysis with DepthMapX; (d) export the outcome map to QGIS, (e) open in QGIS and use this map rather than original GIS-origin street map.
Problem 1: The street lines are now much simplified and somehow 'inaccurate'. But it is acceptable for city-scale analysis.
Problem 2: Time consuming, especially step 2(b).
Could anyone advise a faster way?
I know there is a Space Syntax plugin for QGIS, but it isn't available for the most recent long-term release version of QGIS (3.10).
I try exporting QGIS street map of a city into DepthMap, it takes forever for DepthMap to calculate and analyse (I am using both apple Mac M1 and Intel i5 2020 computers).
Thank you in advance for participating in this discussion and suggest possible solutions.
Best wishes
Ha
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I'm looking for an algorithm to help automatically track soccer ball in a controlled field experiment (cameras positioned near to the ball) and output its time-series 2-dimensional coordinates. While we have found very efficient methods to do this in human movement features (e.g. OpenPose), we are experiencing some difficulties to found similar methods to detect/track other objects (e.g. ball). If you have some positive experiences with a given method, please let me known. Thanks in advance. Luiz H Palucci Vieira.
Hello! Try to use Kinovea (free soft). Nice program for automatically tracking.
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The Novel Coronavirus Pandemic is currently and permanently changing the location of where Resistance Training (RT) is going to be performed. The who, what where, how, and desired effect of RT is never going to be the same.
So many are home bound developing new habits of exercising and cohabitating.
I am wondering how my colleagues here on ResearchGate envision ways that Resistance Training is going to adapt to the new world order of exercise, fitness, health and human movement?
In my view, due to the COVID-19, we are realizing the full potential of the web-based physical Activity and exercising at home. It appears that the pandemic has demonstrated that the internet can expand the scope of educational and professional care and include people who possibly were not comfortable in a traditional physical activity setting. People will cherish more PA, including RT, even in non traditional setting.
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Hi All
in phase space reconstruction and with a aim of unfolding a system dynamic (non linear) first we must determine 2 parameter , time lag and number of dimension. my main question is if our dimension more than 3 how can these dimensions be drawn in MATLAB?
According to its quality and gender
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Do our inner narratives influence movement? If so, would movement then influence the narrative as well? What do our inner narratives reveal about culture and the world of movement around us?
Can the process of dance-making be described in ways that have utility beyond the personal narrative?
I am currently researching the role of the narrative in dancers and would be interested in resources as well!
Many thanks.
here is an article i read recently though my interest in dance, the dancer/performance and subject matter in the artilce-outside academia. i will be glad to help you perform a literature review as i am sure there are many resources out there.
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HookeRL (2000) estimates 6 tons of material (earth, rock, etc.) is moved per average person per year(1). With 7.5 billion on us, ~45 Gt/yr were moved. Much of this movement may be of coal overburden and low-grade ore.
As ore grades drop while living standards rise, I expect the tonnage moved per capita-year will rise year-by-year. Is this quantified anywhere citable?
Haven't seen the book yet - just ordered a used copy.
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i have videos which captured human movement in bird eye view. need to trace the same and analysis the movement pattern. pls suggest me a free software available for research.
HI Niluka,
As far as I know several professional softwares (like premier) have tracking features. Otherwise, a very good solution is kinovea. Kinovea is a video player for sport analysis. It provides a set of tools to capture, slow down, study, compare, annotate and measure technical performances. And, most importantly, is free and open source.
bye bye
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We are going to buy an EMG system in our lab. we are in doubt between Biometrics EMG system and Bioelettronica EMG system. I will be grateful if any one share her/his experience with these systems.
Best Regards.
David.
Dear @Carolina Vila-Chã,
I am so grateful for your useful information.
Best wishes.
Dave.
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The importance of analyzing the human walking gives huge information about the status of the human body. It represents the status of the neurological human system giving orders from the brain through the spinal cord and nerves, to move our limbs in a synchronized way using the muscles, bones, ligaments in an specific order to obtain the human displacement required, indicating a way to detect human movements disorders.
I think there are many ways in which one could respond to you question, Jorge Garza-Ulloa , one viewpoint I would consider is related to the incumbent equations/models that may be used to theorize gait. this paper by Kuo and Donelan gives some nice information throughout the article, and demonstrates the idea of the inverted pendulum (and similar) models of human gait. I'm not sure how far that goes to answer your question, but hopefully helps in some small way. Best wishes, Cain
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Table A.5(a) (Biomechanics and Motor Control of Human Movement, Winter) contains GRF data of all the 104 frames. However, after the second heel contact in frame 97, the GRF is still zero(which it shouldn't be) till frame 106. Can somebody please explain why is it so? Am I missing something here?
because force plates in pathway are limited. the second heel contact was not on the force plate ...
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The center of pressure (COP) is the point on a surface where the total sum of the resultant forces can act with the same magnitude of the force which is distribuited on the surface of an object. Measuring the COP has been used in biomechanics as a way to measure the postural balance in humans. There's been created variables or parameters related to the COP, in order to measure postural balance (e.g. COP Velocity, COP Displacement, COP Trayectory). Some studies have used one or more of this parameters with the purpose of investigate postural balance. But Which of this COP parameters is more usefull to reflect the COP behavior? Are there better parameters than others or maybe each parameter is better measuring balance in an specific task or context?
I think it all comes down to matching your outcome measure to your research question. For instance, if you want to look at variability of a dataset, perhaps the standard deviation of the COP or even a nonlinear approach such as approximate entropy to look at the randomness within a sample.
Another example is using fractal dimension, which looks at the 'predictability' of a given path, where one would assume a more complex path represents either an altered postural control strategy, or perhaps dysfunction of the sensorimotor system.
I suggest reading this article by Prieto et al, 1996, regarding various COP outcomes, and it includes the calculations for each: http://www.ncbi.nlm.nih.gov/pubmed/9214811
Within my lab, we use time-to-boundary, which is a derived signal that looks at the direction and velocity of the COP signal with respect to the borders of the foot. See Hertel et al, 2006: http://www.ncbi.nlm.nih.gov/pubmed/16760569 There are other outcomes like this, and this would represent the amount of time it would take for an individual's COP to pass outside the borders of their foot (base of support), thus the assumption is made they would lose balance or be in a compromised position.
The 95% confidence ellipse is also a popular outcome, representing the locations of the COP, or another measure of COP area, if you want to look at the area of COP displacement.
I hope this helps,
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I need a free software to simulate athletic movements, for example parallel movements in gymnastics. I will be appreciate that someone help me about this matter.
Hi Bas
Thanks so much
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There are lots of papers about researchers which investigated how does the COP behave in some postures (like unipedal or bipedal standing), and functional activities (like walking) on healthy population. Another activity related to the daily living is going up and down stairs, which of course allow us to get to some point (high or down in a building, for example) in case there is not an elevator or other devices that allow us to get there. Furthermore most of the buildings around us (even our own houses) have stairs on them, so we have to deal with that structure.
There are some studies which have investigated the kinetic and kinematic parameters, angles and other properties related to the stair descent. I´m interested in knowing how the COP parameters (Ap/Ml Displacement, Velocity, and trace length) behaves in this activity
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There are different opinions on how to measure basic forms of movements for children, including the University of Ohio on a scale measuring the morphology of the movement through photography Video,
my dear Harshvardhan Singh
Thank you very much for your interest I have benefited a lot from the publication that sent
Accept my greetings
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Different variables (or parameters) related to the center of pressure has been created to determinate how the human postural control (or postural balance) is manteined or modified on a different situation. One of this variables is the displacement of the Center Of Pressure (COP) wich is gived in milimeters.
When we use different devices to measure this parameter, those devices usually give us two different values: the average of the COP displacement and the Standar Deviation of the COP displacement. As i Understand, the average of the COP displacement is an intermediate value set from a group of different values, while the Standar Deviation of the COP displacement is a value set from the variability of different values. My question is: Should we use the Average and the standar deviation of the COP as two different variables, having in count that they come from the measure of the same parameter (COP displacement)?
Dear Javier,
The different variables comprised traditional linear and non- linear methods as proposed by diverse authors [....]. Duarte & Freitas (2010) subdivided the parameterization methods roughly into two groups: First, the traditional parameters which refer to estimations of the overall size of COP excursions, second, structural posturographic and more sophisticated parameters which describe temporal pattern of the time series in a nonlinear manner [...]. The former ones are used as indicators of postural stability outlining COP displacements as random fluctuations. According to this theory, larger COP deflections are associated with less stable balance and in a next step with aging and disease. Consequently, the assumed random properties are treated as unwanted noise and averaged out. Temporal structures of the displacements are disregarded. In contrast, nonlinear methods determine the time de pendent structure of the time series. Against this back- ground, both analysis techniques create complementary information [...]. In my vision, these two parameters (average and SD of COP) are complementary, they are classified in the first group (traditional paraemters), however I prefer to use the SD of COP because the results are most complet. You will can to show the results of these two variables, but depending of the case it will be unnecessary.
Look some papers which I sent to you. I believe they can clarify your ideas.
Best regards.
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I just want to know why is the location of maximum principal strain and maximum von mises stress different? By using different failure criteria, the critical location of failure changes drastically. Why is this happening?
Dear  Sumeet Gupta, first of all the max. principle strain is the positive, i.e. max. tensile strain value that is calculated (the min. principle strain is at the other end of the scale which could be a negative strain or compressive strain). The max. von Mises stress is an equivalent Parameter, which is always positive as it comprises the diagonal stress Tensor componends Sigma-xx, Sigma-yy and Sigma-zz in quadratic form. Hence the max. von Mises could be either mostly tensile or compressive or even a combination of both. Since you have the tensile strain on top (probably Epsilon-xx), the max. v.Mises value at the bottom should result mainly from compressive stresses (Sigma-xx) due to bending around y axis, but with possible contributions from either tensile or compressive values of the other stress components (Sigma-zz). You can check the dominating stress components directly by ploting the single stress components. As main FEM quantity stresses and strains are always available / calculated, you do not Need to recalculate anything. Just post analyze your Output datafile.
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Indeed, there are two modes of coordination between posture-movement (hierarchical or parallel mode) in which deal with the same subject of different manner. So, I would like to know, what is initialy activated by CNS (central nervous system) in this type of movement?
Dear Marcelo,
try also to check this paper, page 49. You'll find a comprehensive description of balance/movement priorities.
Best
Matteo
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A subject performs arm movements in a self-paced manner. Movement parameters are captured by sensors and data is streamed in real-time to the computer. There is a fair amount of variability in the sensors readings: in the attached figure, data points captured from 3 sensors during execution of 10 repetitions of 2 types of movement are shown in the attached file.
A couple of important points:
1) In regards to training data: many subjects will be performing the same types of movements, in slightly different ways. Given the small number of repetitions that each subject will be contributing for each class (say, around 10), we want to take advantage of across-subject structure.
2) In regards to classification: Classification needs to happen in "real time", i.e. while data is streamed. We can assume a typical movement duration (say, 5 seconds) to define a "page size" of data to use for the classification, but that can be pretty variable, both within and across subjects. Ideally, the classifier will return a class more frequently, e..g once per second; obviously, at the beginning of a new movement there will be large uncertainty about the class, which will be getting smaller as more data is streamed.
Dear Stavros, thank you for your time.
I proposed the method  during my Phd Thesis, I was concerned on the generality and soundness  of the method more than ever. But I personally did apply it in realtime applications with success (in internal trials). For all the time my general aim was to create something usable in realtime. Not just a "scientific concept”.
But realtime is a fuzzy term, for it is “function” of the request. E.g. for a package shipping from NY to Washington, an hour for the delivery it is "real-time", is superfast. For an airbag sensor,  to react in less than 30 milliseconds means realtime. So, which  times of reactions are required?
For my realtime tests my rationale was speech recognition:  the method suggested to me by my former advisor Roberto Bisiani that worked for some years on realtime speech recognition matters, when he was a researcher and then professor at Carnegie Mellon University.
In speech recognition you divide a temporal acquisition in tiny  (circa 10 millisec) temporal slices and then you extract features  for (e.g.) HMM analysis. I do not use HMM, only my own method.
We are dipendent from Nyquist sample theorem: I used slices at regular rate of  ¾ sec (it was just a test, slide should be of different dimensions in my opinion).
I think  the methodology can be adapted to the time series for quasi-immediate reactions.
We could work together on the question, and eventually collaborate, at your ease, if you want.
I am reachable at pinardi@disco.unimib.it for any question.
My Best,
Stefano
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Some researches have defined the instant of ball release as " Ball release was defined as the first frame in which the basketball left the  participant’s  hand. ". However, as I hadn't any marker on the ball, I can't use from this definition.
Please let me know, how can I estimate the instant of ball release in basketball free throw by some variables such as elbow and wrist angels ( the peak of extension of elbow joint and or the peak of flexion of wrist joint)?
Regards,
Esmaeel,

Hi Esmaeel,
First, could you explain why you want to know the instant of ball release? Are you trying to compare with previous research? Or are you trying to answer a specific research question? How accurate do you have to be?
Second, could you elaborate on what data you have measured?
Frankly, I don't think you can reliably detect the instant of ball release if you only have joint angle data. Sure, you can estimate it happens at for example the the peak velocity of the wrist angle, but you will never be entirely accurate due to (functional) variability. Ultimately, you would have to validate your assumption that instant of release and some variable of joint angles are related.
Good luck,
Rens
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Is there a comprehensive taxonomy that can explain the state of the art of current abnormal events detection techniques from video?
Hello. I imagine that it depends what you mean by abnormal event. From my point of view, this type of problem takes two forms. The first is an image processing problem where you look in a single frame for an object with a certain feature. This can be reduced to a parameter estimation problem. The second way is to view the problem as one of change detection, i.e., the abnormal event corresponds to a change in the dynamics of the underlying system (think of you car engine when something inside it breaks). There is a large literature on change detection, which can be approached in many ways. My experience of this type of problem is from the area of manoeuvring target tracking. Hopefully you can find some useful references for your work as quite a lot has been done in this area (see link), although the sensor is usually a radar system rather than a video sequence.
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I'm currently investigating the frequency-compounds of acceleration data from human arm movements. Therefore I used the FFT to extract main frequencies of the accelerations which happen to be some kind of sinusoidal waves with mean near to zero. This works pretty fine for repeated linear motions. Now I would like to analyse data from more complex behavior like throwing or grabbing tasks. As far as I noticed and know, these movements consist of different accelerations with phase shifting and frequency shifting. I did some literature research and found that there is the STFT (short time Fourier transformation), which contains time domain information AND frequency domain information. That would be perfect for my case, so I can elaborate the features of these non stationary motions. My questions are:
1. Does anyone have experience with the STFT on acceleration data from human motion with MATLAB?
2. Does it even make sense to give it a try or are there other common analysis methods for this case?
I think that Fourier's transformation doesn't correspond to the task solved by You. It assumes strict frequency of the studied process. This is uncorrect. Use of a veyvlet transform would be more correct. From the point of view of presentation it is better to use Morle wavelet calculated as integral with linear frequency scale. In this case unlike Dobesh's veyvlet the narrow frequency peak is shown well, but there are hidden problems with its temporary localization.  Problems of masking of frequencies and Nyquist's frequency won't disappear anywhere in principle. We so investigated temporal change of frequency of a physiological tremor. This process significantly more slowly, than what you try to investigate The truth our employee wrote the program.
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I'm looking for recent theories & relevant evidence for both my MSc research project and a summative essay. Many thanks!
Hello Jenn - You can search for keywords like "entrainment" or "groove".
You will find references to a large body of research in the following (very recent: November 2014) paper:
Burger, B., Thompson, M. R., Luck, G., Saarikallio, S. H., & Toiviainen, P. (2014). Hunting for the beat in the body: on period and phase locking in music-induced movement. Frontiers in Human Neuroscience, 8. doi:10.3389/fnhum.2014.00903
Best, Olivier
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My project is based on compression of body sensor data. It's main objective is to conserve energy during transmission. Hence, the data should be continuously monitored from a person wearing sensors and performing normal routine. If anyone knows where to find such data, please help.
There is a new project (The Voice of the Body) from Samsung that plans to give people access to a large database of recorded movements. You can find more details on their website: http://www.voiceofthebody.io/bioinformatics
It's not available yet, but I think that may be a good option for what you want.
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I am planning to study the force of a motor response in children with disabilities.
I need to video tape the movements and upload the videos in a system that allows me to obtain the angular velocities. The difference in angular velocities will give me the force of the movement.
The best system I know to analyze movements is OpenSim, an open project of the Stanford University
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First of all, I want to know this value for the gastrocnemius and soleus muscles.
Vladimir Zatsiorsky is completely right in stating that in eccentric contractions dF/dt can be very fast. Mind that a muscle is composed of a contractile and an elastic element in series. For fast eccentric actions dF/dt = dF/dx . dx/dt = k.dx/dt in which k is the elastic stiffness, thus dF/dt mainly depends on the lengthening speed dx/dt, not on the muscle contractile properties.
For comparing muscle contractile properties, you may better use isometric actions. For this case you can find some formulas in my paper 'Muscle mechanics and neuromuscular control, J. Biomechanics 36:1031-1038 (2003) in Appendix 1.
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As far as I know, there are some methods for this purpose, such as UCM, GEM, and TNC. However, because these methods are complex, please let me know, are there a more simple methods for this purpose?
Esmaeel.
Since you have a discrete task (if you consider the success of shooting as goal and the release position, orientation and velocity as body level states) the GEM will be the best approach. I agree with Klaus Blischke that the CR (correlation by randomization) approach introduced by Muller also will be a good choice. but the sensitivity analysis an generality of GEM makes it the best choice. maybe it seems a little complex but really it is not that complex. I re command you to take a look at recent paper of Joseph Cusumano and Jonathan Dingwell. " Movement variability near goal equivalent manifolds: Fluctuation, control, and model-based analysis". specially section 4.4, general experimental hypotheses. they are really interesting. although some of them are not testable for your task (like DFA analysis that needs quite large number of trials) you can give some help from engineering groups working on the subject in Iran.
the UCM analysis will be easier to run. It is appropriate for analyzing the continues task of throwing too (in a identical initial position until the ball release moment).
the more easier approach will be PCA which you can run in MATLAB with a single function like princomp.
Generally it depends on your hypotheses and  level of analysis and interpretation you want to have.
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I know that the HKB model is applicable for bimanual coordination tasks like waggling two fingers or limbs within or between persons. I am curious if there is an extension of the HKB model, or another model, that would be relevant for coordination between more than two oscillators (e.g., typing, playing piano)?
This seems relevant to what I am trying to ask. Thank you!
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I'm looking for a bibliography about how body segments change their outer shape in motion. Trying the obvious keywords in different search engines and scientific databases basically lead me to works about (a) markerless motion capture, (b) analysis of silhouettes, and (c) face morphing. I'm more interested in the shape of other parts like upper or lower limbs.
Thanks Matteo, but what I am looking for are references about characterisation of body shapes in motion, whereas the problem addressed in papers like the one you cite is rather the opposite: how to cancel the motion of such soft structures to estimate the rigid motion of the underlying bones. Of course, one of the strategies for that is trying to model the motion of the muscles and skin, but that is not the focus.
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I'm looking for suggestions on any standardised methods for measuring the efficiency of hand motion in 3D space. The task I am analysing involves touching and pushing various objects. As the choice of objects is up to the participant, the distance and sequence of motion changes between participants. I have high resultion position data captured by a device the user is holding while performing the motions.
I am superficially aware of metrics such as shortest distance travelled or the concept of minimum jerk. Formal definitions of these methods, other useful methods or key citations are all welcome. In particular I am interested in measuring how many times someone changes direction or deviates from straight or curved trajectories during motion.
Hello,
I hope you will not mind my contribution here as it does not shed any light on your question in any way but might help someone who may read these Q&A in future.
The best approach in any experiment is to plan it ahead and decide what you will measure, how and what will you do with the measurements. If any experimental work is being undertaken on human subjects be they normal or patients the law in UK and I think that goes for all of EU, requires you to secure a favorable opinion from a research ethics committee (REC). Such a committee would not grant permission for experiments unless there was a clear and valid protocol for the study, which goes back to what I wrote at the start, i.e. plan the measurements and the analysis etc.
Best of luck
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Actually, mobility is used to predict the feature location of the node which is moved by the node. If our prediction is realistic we have to move an effective and efficient connectivity between the node.
Human mobility is defined by the area which is traveled by the Node (Human is Attached with Node so we say human mobility models). If we make our university be seen in terms of Human mobility, the path of this university is predefined. By using this we will be able to show human movement which is more accurate.
Our aim is to develop new ways to use mobility predictions. Human mobility/Social mobility has been widely studied in many areas like urban planning, traffic forecasting and avoiding the spread of biological and mobile viruses It’s also an essential topic used to improve the performance of wireless ad-hoc networks. This is why I want to develop a mathematical models for our university campus.
This is a very interesting topic. I suggest reading of:
Describing patterns of physical activity in adolescents using global positioning systems and accelerometry.
Maddison R, Jiang Y, Vander Hoorn S, Exeter D, Mhurchu CN, Dorey E.
Pediatr Exerc Sci. 2010 Aug;22(3):392-407.
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According to the book "biomechanics of human movement" by David Winter, there are linear motions in the joint during any movement so axes of joint change at any time. Thank you for your thoughts.
Yet, every motion can be defined by a rotation about the helical axis and a translation along the helical axis. To avoid the oversimplification, all you need to do is to release the constraint that the helical axis is fixed in space throughout the movement. Kane's Advanced Spacecraft Dynamics book does an excellent job in defining the helical axis.
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I'm faced with a time limit. Which one of these journals review the manuscripts faster?
1. Human movement science
2. Clinical Biomechanics
3.Journal of Therapy in Sport
I have not found a pattern in the turn around time. Although most articles are avaialble electronically, the audience you are trying to reach should be taken into account. Some journals very much target practioners, who may not be searching for articles electronically, but will peruse specific journals
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