Science topics: Navigation
Science topic

Navigation - Science topic

Sensors, Systems, Signal Processing, Data Fusion
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Hello,
I am looking for a terrain elevation database to develop a height-aided navigation algorithm.
In particular, I would provide a coordinate in (lat, lon) then the database could give the height with respect to mean sea level or ellipsoid, etc.
The spacial resolution should be less than 100 m and the vertical height accuracy of fewer than 20 m if possible.
Thank you for your help.
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Hi, you can find the global 15 arc-sec bathymetry in GEBCO - The General Bathymetric Chart of the Oceans (www.gebco.net)
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The KITTI dataset provides its IMU raw outputs in its raw data fold. There are two kinds of coordinate systems, one of which can be expressed as xyz and the other as flu. For example, the accelerations are shown as ax, ay, az and af, al, au. They two seem to be the body coordinate system. However, I compare the two related of them (such as ax and af) and they are not equal.
How can I understand them well?
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Yuxuan Cao & Benjamin Tennstedt Thanks for a helpful discussion. By any chance are you able to see actual any calibration matrix (IMU to Vehicle frame ) ? I also wonder, how to interpret xyz and flu coordinate values.
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In user guide said:
in the navigation pane, open Setup, then click Substreams and ...
but I dont have substream.
Whats the problem?
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Substreams are specified in Setup of the Simulation environment, not the Properties environment. Open Setup in the Simulation environment, then click Stream Class. Then click the tab Stream Class. Use the pull-down menu to select a pre-defined stream class with substreams.
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I used RSM for an optimization study using design expert 13.
I expected that the software will generate optimum parameters which may not necessarily be part of the experimental runs as I have seen in most articles. I really dont know how to navigate my way into finding the optimum parameters. Any advise ?
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Hi Oyebamiji
How can Design-Expert tell you which factors shall be set to optimum if you're not telling the program where your optimum is in your response? Also you need to tell the program constraints in your factors, otherwise it will be "too easy" for Design-Expert to find desirable solutions.
Probably some factors are more easy to control than others! You have to consider this when proceeding with optimizations.
Basically, you need to understand what comes after RSM, which is the Optimization in DX13. Here you can find a tutorial from statease:
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What is the position error limit for GPS aided INS sensor fusion for small rockets?
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For example, this competition pulls down ITS equipment (Navigation, sensors etc) and new generation car prices drop.
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In the end it is a better mobility: Less air pollution, more safety, less travel time, less space.
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I have navigation sensor error model and for practical implementation purpose how to find p(0) and initial state x(0)? my states are velocity error, misalignment angles in INS, gyro bias and accelerometer bias. State equations are given below?
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Unlike other specialties that are limited to a particular organ or disease, family physicians are the only specialists qualified to treat most ailments and provide comprehensive health care for people of all ages — from newborns to seniors. This looks like:
  • Caring for patients regardless of age or health condition, sustaining an enduring and trusting relationship
  • Understanding community-level factors and social determinants of health
  • Serving as a patient's first contact for health concerns
  • Navigating the health care system with patients, including specialist and hospital care coordination and follow-up
  • Using data and technology to coordinate services and enhance care
  • Considering the impact of health on a patient’s family
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AAFP. has full description of family medicine scope.
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Dear All,
Coagulating (aggregating, coalescing) systems surround us. Gravitational accretion of matter, blood coagualtion, traffic jams, food processing, cloud formation - these are all examples of coagulation and we use the effects of these processes every day.
From a statistical physics point of view, to have full information on aggregating system, we shall have information on its cluster size distribution (number of clusters of given size) for any moment in time. However, surprisingly, having such information for most of the (real) aggregating systems is very hard.
An example of the aggregating system for which observing (counting) cluster size distribution is feasible is the so-called electrorheological fluid (see https://www.youtube.com/watch?v=ybyeMw1b0L4 ). Here, we can simply observe clusters under the microscope and count the statistics for subsequent points in time.
However, simple observing and counting fails for other real systems, for instance:
  • Milk curdling into cream - system is dense and not transparent, maybe infra-red observation could be effective?
  • Blood coagulation - the same problem, moreover, difficulties with accessing living tissue, maybe X-ray could be used but I suppose that resolution could be low; also observation shall be (at least semi-) continuous;
  • Water vapor condensation and formation of clouds - this looks like an easy laboratory problem but I suppose is not really the case. Spectroscopic methods allow to observe particles (and so estimate their number) of given size but I do not know the spectroscopic system that could observe particles of different (namely, very different: 1, 10, 10^2, ..., 10^5, ...) sizes at the same time (?);
  • There are other difficulties for giant systems like cars aggregating into jams on a motorway (maybe data from google maps or other navigation system but not all of the drivers use it) or matter aggregating to form discs or planets (can we observe such matter with so high resolution to really observe clustering?).
I am curious what do you think of the above issues.
Do you know any other systems where cluster size distributions are easily observed?
Best regards,
Michal
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Dear Johan!
I want to recommend you papers of my husband)) He study aggregation of blood particals by scanning flow cytometry and also produced (I think, new and fruitfull) kinetic model for this processes. It is his profile https://www.researchgate.net/profile/Vyacheslav-Nekrasov
As I understand, key papers is
1 Brownian aggregation rate of colloid particles with several active sites
2 Kinetic turbidimetry of patchy colloids aggregation: latex particles immunoagglutination
3 Mathematical modeling the kinetics of cell distribution in the process of ligand–receptor binding
4 Kinetics of the initial stage of immunoagglutionation studied with the scanning flow cytometer
But you can write him directly))
Best wishes, Anna
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For GPS - INS fusion how to find the rotation matrix from body to navigation frame and how the coriolisis and gravity will effect the navigation purturbation equations?
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Dear Varsha:
As Nabil answered, Farrell's Aided Navigation is a good book. Other good books are:
Biezad, D. J., Integrated Navigation and Guidance Systems, AIAA Education Series, 1999
Rogers, R. M., Applied Math in Integrated Navigation Systems, 3rd ed, AIAA Education Series, 2007
Grewal. Weill and Andrews, GPS, Inertial Navigation, and Integration, 3rd ed,
John Wiley 2013
Farrell, James L., GNSS Aided Navigation and Tracking, American Literary Press 2007
Farrell and Barth, The GPS and Inertial Navigation, 1999
For further correspondence with me, you may write to me at IIT Indore,
Also, you may see Sreeja, Professor, in your college, in Electrical Engineering.
I hope all this helps.
Hari Hablani
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For example how can I search for expression changes in x tissue induced by armodafinil consumption? I do not know how to navigate the site
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Maybe DrugMatrix will do the Job? https://ntp.niehs.nih.gov/data/drugmatrix/
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Hi,
I face the following problem:
I want to use a measured quaternion (from an AHRS) for the update within an UKF to update the attitude.
My state vector contains a quaternion, therefore I want to know, if I could calculate the Kalman innovation with the quaternion directly or do I need an alternative representation (Euler angles, orientation vector...)?
The problem with Euler angles is, that for the +-180° (South) direction, an UKF would spread its sigma points around a discontinuity. This does not sound harmless from my point of view.
Is there an elegant way to solve my problem?
Best regards
Maximilian
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This is a strange question. You must use the measurement model, which relates your measurment to the state you want to observe.
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I know there are many algorithm used in indoor localization and also for tracking (each or both together) like kalman filter, Complementary filter, Madgwick filte, Best Fit, a weighted consensus, geo-fencing function, ACASIM, ACOSIM, Monte Carlo localization, active noise control, active noise control and many.
my question is as follow:
1- which is the most 20 algorithms (pros and cons) that used till now in indoor navigation (find location or tracking object "human mainly or any object" ?
2- what is the most known used in indoor without implementing sensor in indoor infrastructure ?
i find may papers talking but not much focusing on comparing indoor algorithms from location or tracking side
I really appreciate you help / recommandation / ideas
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Hello everyone,
I am implementing Galileo E1 tracking, and I want to use FLL assisted PLL, I am using the structure given in 'Understanding GPS' by Kaplan (Page 182, figure 5.21(a)).
I try to explain what I did:
1. First I implemented FLL discriminator (ATAN2 discriminator) given again in Kaplan (Page 171, Table 5.4). But there is a small NOTE under this table telling how to choose t1 and t2 to calculate Ip1, Qp1,Ip2 and Qp2.
In that note it is written, that the two I and Q samples must be from the same navigation bit interval. My first question here is that, as my integration time is 4ms then in every iteration I will have one set of Ip and Qp, and in the next iteration I will have the second set of Ip and Qp, but both these sets are from different navigation bits because navigation bit interval for Galileo E1 is 4ms, then How can I have two sets of Ip and Qp from same navigation bit?
2. For the problem above, what I tried is that I reduced my integration time to 2ms, so that I can have two iterations per navigation bits and two corresponding sets of Ip and Qp values.
In that NOTE also, it is written that no Ip and Qp samples can be repeated in the calculation of next FLL discriminator values.
Now the question is: when I am in the second iteration I am using the Ip1 and Qp1 from the first iteration and Ip2 and Qp2 from the current(2nd) iteration, but when I will be in the third iteration, I will have to use Ip1 and Qp1 from the second iteration, that are from the previous navigation bit and also I will be using it for second time. So it means I will be repeating Ips and Qps to calculate FLL discriminator values.
I have read a lot of papers, but no one said anything about the working principle of FLL assisted PLL.
Does anyone has an idea how actually it works in every iteration and how it removes the frequency error from the incoming signal?
Thank you so much
Raza Javed
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It is a requirement in many universities these days to publish their thesis research before they graduate. How can mentors/ supervisors navigate the thin line between allowing the student to work independently without a lot of input and at the same time produce a nice paper for a good journal, especially for weak students? Is this why it is better for a student to publish after graduation?
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I think it is good to publish your thesis work before graduation. To me it is a waste of time to conduct a research and not publish it. Even if one is a weak student you must push to publish because after graduation when you meet other people in your field you will see how you have wasted your time. Also it is good to have a good supervisor that can help and assist.
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I am trying to get the even and odd mode impedance for a coupled line structure made of CRLH unit cells. As described in this page https://www.hit.ac.il/.upload/engineering/microwave_-_experiment_5_-_coupler_design.pdf, I have simulated in CST and got the line impedance result in navigation tree - port info. 2* line imp.=even mode imp.(even mode excitation) and line imp/2.=odd mode imp.(odd mode excitation) : is this correct? Also in navigation tree - port info.-port modes base, I can see another set of line imp.1(1) and 1(2); what do they imply? Even mode 1(1) is close to odd mode 1(2) and vice-versa.
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Hello,
CST and HFSS can calculate even and odd modes approximately. If your structure has two microstrip feed lines, you can extract even and odd modes by creating weak coupling between main resonator and feed lines. The peaks of S21 figure show even and odd modes.
Weak coupling can obtain by the one of the following ways:
1- place feed lines near main resonator.
2- use capacitor element between main resonator and feed lines.
I think it is better to calculate even and odd mode theoretically instead of commercial software.
Good luck
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My friend is looking for coauthors in Psychology & Cognitive Neuroscience field. Basically you will be responsible for paraphrazing, creating figures, and collecting references for a variety of publications. Please leave your email address if you are interested. 10 hours a week is required as there is a lot of projects to be done!
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I have heard of lobsters using the earth's geomagnetic field, and now, sharks. How many other animals navigate use the earth's magnetic field? I have also read that indigo buntings travel at nights using stars to guide them. Some species, such as bees, may use the sun...Did now-extinct ice age animals also geonavigate?
New Evidence Suggests Sharks Use Earth’s Magnetic Field to Navigate
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Following some geonavigate using by fishes, reptiles and sea turtles.
Star navigation, Magnetic Fields,
Solar Navigation.
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Are global navigation satellite signals like GPS, Glonas, Navic, or Galelio received under water ? Can Radio frequency signals penetrate underwater ? Up to what depths ? If not then what sensor systems are used for navigation?
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Thank you so much Marc Schmieger and Recep Turan
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There was yet another case recently of a dog running away from its new home and returning many miles to its original home.   My uncle, totally blind from birth, used to navigate around the streets of his home town, giving directions to his wife who was driving.  Elvin Thurston (New Scientist April 30th 2016 p 53) says that when young he could navigate a car without a map, and suspects he was sensitive to magnetic fields.  It is difficult to see what other explanation there is for these navigational feats and extraordinary sense of direction. 
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Animal navigation is the ability of many animals to find their way accurately without maps or instruments. Birds such as the Arctic tern, insects such as the monarch butterfly and fish such as the salmon regularly migrate thousands of miles to and from their breeding grounds, and many other species navigate effectively over shorter distances.
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Hello all, I am trying to align 2 genomes with Mauve tool under windows10 or Linux, but unfortunately Sequence Navigator option does not highlight search results with none of the operating systems ! What is solution for this problem?
Leyla
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I have encountered the same problem. did you get to find out why?
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Dear all,
As part of my research on adaptive navigation assistance systems, I’m trying to evaluate how well Google Maps instructions capture how a human wayfinder perceives a given wayfinding situation.
A questionnaire (link below) has been designed to capture different opinions and I would really appreciate it if you could please participate in this survey.
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Fateme Teimouri I have answered the survey. All the Best with your research!
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Hi
I'm on my third year of an Open University degree. I'm coming towards the end and now preparing to think about questions to use for my final essay.
The concepts this module have been around 'security, attachment and conduct'.
The question that I've come up with after much thought is:
'How do women navigate, react and conduct themselves with a perceived threat from men'
I feel it will give me the agency to show all the skills I've learnt over the past few years and it feels relevant to today. However I would hugely appreciate some tips, advice and constructive criticism from those more experienced than I.
Thank you in advance.
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Thank you so much P. Laure. I was hoping to expand on the idea of threat in the essay.
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Hello,
I am looking to send out links to an online survey. My previous research project used a paid for survey software. I am now looking for something that's free but straight forward to navigate, that allows participants to jump to relevant questions depending on their answers.
Any recommendations please? I've used google forms before, anything better?
Thanks,
Donna
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Hi,
Thanks for your responses Naomi T Katz , Sadia Afroj , Fatma Seda Kara
In the end I got institutional access to Online survey software.
So far so good.
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I am new to opensees navigator GUI, in this regard i need user mannual or any other stuff or any other guiding docs/manuals /Tutorial's etc. would be welcomed.
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I'm currently working on a new improvement for the artificial potential field algorithm (APF) for obstacle avoidance, I've got some interesting results in ensuring a local-minimum-free algorithm with a low computation cost; In order to show the effectiveness of my algorithm I have to compare it with other methods, specifically the Harmonic potential functions which are well-known for overcoming the local-minimum problem.
Hence, I need the opinion of researchers who have experience with this method for both theoretical and practical aspects.
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Dear Mouhamed-Mourad Lafifi
I have already checked some of those papers, I'll check the rest, thanks for your recommendation, it will be more suitable if i can find a comparative study
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According to the vertebrate literature, I got the impression that head-direction cells are always anchored to an allocentric reference frame. This can easily be tested with freely moving animals. But what is about tethered animals that can freely rotate around their body axis but can`t change their actual position. Are neurons encoding the animals heading automatically defined as allocentric ones? Or how could you test with a tethered approach, if the neurons encode heading in a allocentric reference frame or in an egocentric one?
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Please correct me if I am wrong ,but the neurons (of the parietal cortex) reported in the PNAS paper are not classically circumscribed as head-direction cells. Sure, they show heading tuning but for me this tuning looks more like a sensory-based peripheral tuning. Although not being an expert in that field, I Interpret the parietal neurons to encode more general aspects of body-posture relative to surrounding objects and not necessarily to be specialized to purely encode aspects of navigation like cells of the hippocampus network. I guess this may be also the reason, why the authors do not explicitly termed the parietal cortex neurons as head-direction cells. But it is valid to say that there has to occur a transformation from egocentric to allocentric reference frames somewehere in the brain (and obviously also a retransformation from allocentric to egocentric).
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I mistakenly uploaded a copy of the same paper and entered my alternative name. How to delete them out? (I couldn't navigate to the right buttons to do it. So from where to where is what I don't know.)
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Any author can edit the name of the author of the research paper as below:
  1. Go to your Profile settings page
  2. Click on the Edit name button underneath Name information
  3. Select the Add an alternative name tab in the box that appears
  4. Update your alternative name with the name you published under
  5. Click Save to confirm your changes.
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INS-RTK modules claim to be close to a cm accuracy, has anyone used one and if so, how expensive can the telematic charges be if I have a case to run it 18h per day?
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Dear Mani Entezami, we have used for our studies the Leica Zeno GG04 plus Smart Antenna (RTK-based but without INS) and XSens MTi-680G (RTK and INS-enabled). Both reach cm accuracy. As network RTK service we use HxGN SmartNet. You can buy hour packages or unlimited access. For GB you find prices here: https://hxgnsmartnet.com/en-gb/services/network-rtk
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I am going to reduce the order of my state-space model, that is I am using "hsvd(sys)" in Matlab to get an approximation of what should be the order of my ROM. I have been able to reduce the order of my model from 240 states to 30 states, i.e. only 30 states appear to have a high value in the hsvd plot. I have the new sensitivity matrices based of rsys=balred(sys,30), though I need to know what are the states that have been deleted/ what are the states that my new ROM (rsys) keeps involved in the model.
I sincerely appreciate any suggestions and thoughts on this matter to help me deal with this issue.
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I couldn't yet. Though I would appreciate it if you could share your ideas with me once you found a way to get around this issue.
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I need to know that if there is a way to measure short displacements from IMU readings (I mean the accelerometer part). I have a vision algorithm that estimates the displacement between two frames. the time duration between frames is about 33 ms. but the displacement is in pixels. so i need another sensor (for example imu) to measure the true scale in meters.
thanks for any help
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If you have any motion with constant velocity, the IMU could not be used to measure distance at all.
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I am having trouble navigating the phylofish database. I can blast my gene of interest and get the " Best match," but from there, I cant seem to figure out where to go to find the expression level data for my gene of interest. If anyone can share some guidance for this stuck Ph.D. student, I would greatly appreciate any and all!
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Interesting question. Following the discussion.
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Dear all, I am thinking to develop solutions for blind people to navigate and positioning themselves in indoor areas such as malls, hospitals, etc. I am thinking about the tool or device that can be used to help in guiding them into the desired location. Mobiles and smart gloves are found in some research papers. I am looking for your ideas and opinions to help in solving this problem that affects a big portion of the community.
Thank you in advance.
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Nice topic Dr. Mohammed, I knew some of visually impaired people during my master study and they can move from one place to another by counting the steps, it means that they draw a map on their minds based on the number of steps.
So if u don't want an audio guide, I suggest to make something that can touchable and understandable for their minds to navigate a specific area.
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Hi all,
I need some advice on navigating BLAST, specifically for confirming adenovirus sequence identity in the human cell line HEK293T. These cells were immortalized via insertion of a 4344bp segment of adenovirus 5 genome into chromosome 19, which immortalized the cells. The segment codes for E1A/E1B proteins, which interfere with cell cycle control and apoptosis. I would like to confirm the inserted segment from HEK293 vs. the adeno5 genome. hek293gnome.org has a nice genome viewer to compare genomes of a number of 293 variants, but comes up with off target matches when I ask for E1A at Ad5. Also, the 'contact' page throws a captcha error when I press 'send' but I see no captcha option.
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293T, the T means SV40 large T antigen
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Hi! I am working on bats. I am eager to mount low cost, light weight, long battery life navigation devices. I will also mount ibutton temperature and humidity sensor along with navigation device. The purpose of attaching navigation and temperature sensor to bat is to 1) measure temperature at the level of bat in the canopy of roost tree. 2). navigation device help recover temperature sensor in case temperature sensor is lost and also help track bats foraging areas. Requirement for temperature sensor and navigation device is 1) light weight (20-40gm) Measure temperature (-20 to+80) Humidity Measurement (95% RH to 100% RH) Extended battery life (>5 Years). I found out these devices Remora 2 (GPS 4G) https://www.digitalmatter.com/Devices/4G-GPS-Tracker-Devices/Remora2 and Ibutton Temperature Senor https://www.embeddeddatasystems.com/DS1923-F5--Hygrochron-Temperature-Humidity-iButton_p_101.html
Please suggest any better option for meeting my research objectives?
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Yeah! But they are quite expensive. I am looking for similar GSM/GPS devices with local network coverage.
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Hi,
I am doing a research with Theory of Planned Behavior. The behavior is attending a course/training on the subject of orientation, navigation and topography in the next year. I completed elicitation process (n = 30). I am presented with a dilemma. I would like to do direct measurement because indirect measurement makes my questionnaire too long, but I would also like to include some of the statements/variables that I got in elicitation process. Is that ok? Or is it really not recommended?
For example: Direct measurement of attitude would be: "Training in the field of orientation, navigation and topography is... (useful; interesting; instructive; etc.)".
Can I also use (for direct measurement) statements as:
"Training in the field of orientation, navigation and topography encourages socialization."
"Every individual must have skills of orientation, navigation and topography."
The same goes for other two constructs, Subjective Norm and Perceived Control. Is it ok if I use both types of statements for direct measurement?
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What i have done many times in designing student projects where especially i want to test specific things i would do the exercise myself. By doing so I test whether the questions I ask are appropriate, by me doing the task do the readings or measurements i get make sense, do i achieve the goal of what the project is all about in terms of taking all the data through an analysis process to ensure results make sense. Normally with some research you start with a hypothesis you would like to confirm as either truth or false, do the conclusions you draw from the experiment make sense? From all this I learn how to ask questions, whether the experiment design is appropriate or even whether the questions asked suit the experiment in question.
What i am getting from your research is you are asking cognitive questions of a subject that is highly specialized, perhaps to determine how easily one may perform the tasks. First an understanding of the terminology (orientation, navigation, topography) used is required and the context within which they are to be used. In the context of land and topographic surveying and geomatics from which these terms and science originate, topography pertains to the slope of the ground as determined through elevations tied to a geographic reference xyz frame. Orientation pertains to what direction you are facing, north, south, east, west, up, down etc. Navigation pertains to how you move from point A to B in such a way that given instructions to follow from A you get to B. Second, all this is accompanied by the complexity of equipment used to accurately accomplish the task. What is the experiment design like, it can be as trivial as using GPS to now as complicated as getting a vehicle to move autonomously from point A to point B.
My suggestion is get a first draft of your questions which you associate with your level of experiment then do it and see if all makes sense. I trust this will help structure your research to make it meaningful.
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Accusation between the US and China is becoming a daily affair and gaining momentum. The two economic and military superpowers are moving away from collaboration and inching towards confrontations in most issues.
is the problem "unfair trade"only ? or, there are other issues? Is China becoming powerful enough that Washington feel threaten?
How is this going to affect the rest of the world?
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"You can not start a fire without a spark"; we have now seen many sparks - but no fire. Why is that?
Lou
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Hi all,
I am looking into research regarding any type of relationship between marijuana use and a person with a schizophrenia diagnosis. I have not narrowed my topic, however I would like to begin with a data dump to help navigate a direction.
Thank you for any assistance you may offer.
Ashley.
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Over 50 yrs. of clinical experience I have found a weak connection between schizophrenia and MJ. Only in very high doses, over 300+ mgs. Can cause some to evidence delusions of paranoia. Those w/ untreated schizophrenia can exhibit delusions and hallucinations. Folks who are diagnosed as having schizophrenia more often abuse nicotine which interferes w/ psychotropic meds.
I'm sure that a robust search of the clinical literature will yield more useful data.
Best, Rich
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Dear Researchers,
Nowadays, we see a variety of maps in web applications, the main purpose of which is one or two precise layers, and the other layers of the map are not very precise and are more intended to help better understand the map. For example, navigation apps often pay close attention to access routes, and other layers of the screen are just to create a natural sense of the real world.
Do you know of documents that can refer to and cite?
thank you very much for your time
Sincerely, Ali Madad
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This paper on the role of Generalization in Thematic Mapping may be of interest. I think this could be what you are referring to:
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Project Details :
The project involves the development of a novel navigational model and a DSS based on multi-criteria approach for providing support on e-navigation and collision / obstacle avoidance for operations including conventional and marine autonomous surface vessels (MASV). The developed system will be used for both improving the vessels propulsion system design and control as well as for ensuring safe navigation. The project commences with the investigation of the current and future propulsion plant alternatives for both vessels types and proceed to the selection of the ship types to be investigated along with their hull and propulsion system characteristics. Fidel models for adequately representing the investigated vessels subsystems/components as well as the ships control systems (engine and steering control) modelling will be developed. Based on these models, the identification of the propulsion system limitations will be carried out. The next project phase includes the integration of the developed models to form a vessel digital twin for representing the behaviour and response of the investigated vessels propulsion and manoeuvring. The uncertainty involved in the complete chain (sensors, models, conditions, actuators, course, decision made) will be thoroughly investigated and its influence on the proposed actions will be quantified. Appropriate risk metrics including the navigation practices, minimum distances as well as reliability and failures of the propulsion system and its components will be introduced for characterising the safety of the ship’s navigation. A number of counter scenarios including the number or the involved vessels (and their types), the navigation area details, the prevailing environmental conditions as well as  the quantified level of uncertainty and the human  response, will be evaluated for accessing the associated safety metrics and characterising the collision risk.  Based on the examined scenarios results, optimal control systems will be proposed and decision guidelines will be suggested. All the previous steps will allow the development of the novel structured DSS.
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follow this article of DSS
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Paradoxes in business i.e. strategy paradoxes, leadership paradoxes, management and organizational paradoxes are inseparable from organizations’ front-end decision making.
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I'm looking for existing  beacons technologies for outdoor localization. where can I find these sensors please ?
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Hello everyone
The UMI3D Consortium's working group dedicated to embodiment is currently looking for a device agnostic way to manage navigation in Collaborative Virtual Environment (CVE).
Are you aware of existing research in the field ?
The objective would be to extend of the UMI3D protocol to handle the followings issues: - Sharing a common representation of a 3D environment's "navigable" areas to asymmetrical devices. - Managing the collisions between the users and the virtual environment. Our assumptions are the following: - It is not desirable to continuously control the movement of the user (e.g. sliding of the virtual cabin) because of the network latencies which would cause significant motion sickness. - It is difficult / undesirable to impose the same navigation technique (e.g. go-go) on all devices (due to different good practices and context of use). - The correct way to manage the collisions between a user and virtual objects differs from one device to another (e.g. freezing some dof of the camera on a PC is common but it is causing motion sickness in a VR headset).
Thanks a lot for your help
Kind regards,
Julien Casarin
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I'm not sure I have fully understood what you want. But why don't you use classic teleport, just as used by steamVR or GoogleEarth ?
You would drastically reduce your cybersickness in VR HMD, and it is still very enjoyable on computers (think of googlestreet map). Plus, you can make the teleportable areas slightly smaller than your room, so you wont have to manage collision with walls. You can just select non teleportable area to manage inside room collision.
In unity for example you can just use a raycast with a tag for teleportable area, so your users will not be able to teleport on each other or where you don't want them to teleport.
Clifton, J., & Palmisano, S. (2019). Effects of steering locomotion and teleporting on cybersickness and presence in HMD-based virtual reality. Virtual Reality. https://doi.org/10.1007/s10055-019-00407-8
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The mostly adopted pedestrian or cyclist navigation systems are derived from car navigation systems, where the pedestrian is "a car with no wheels, and two feet instead".
This gives a bias from the start, and short-cuts between buildings are rarely considered. The criteria of relatively cleaner air on a path, or more enjoyable sights which may matter to the pedestrian individual are not taken into account.
The minimal path search assumed as optimal may not be the choice which individuals would make, given the opportunity: using the walk to reinforce fitness and exercise (voluntary stairs climb, etc).
The urban versus natural segments may not be considered either among valid options, one would like to be offered.
What would be your criteria for a pedestrian navigation system?
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Good day !
I would like to offer 2 remarks on crowding;
given the succes of more or less active modes, some growding might appear especially on limited capacity linfrastructure, because of convergence (for example a bridge)
1) regarding the travel time, if only a small portion of the itinerary is crowded, this is not very important (example, 10 mn walk on a total communting time of 30 mn, if this is not 10 but 12;, who cares ?) The travel time could be indicated with an intervalle : 8 to 12 mn.
2)According to what has been observed with the Solomon curve (50s) for safety, one of the main concern is the difference of speed, not the speed in itself.. It seems to be the case of lanes with bycicle lane and pedestrian path. . Electric trotin seems to be rather dangerous for all kind sof trafic. One of the somution could be to ban them entirely, in crowded lanes or even, in some municipalities.. But I wonder if this policy would be popular.
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Good morning
I'm interested for cooperation. My reseach is treatment of signal  (colon Cancer.... ) and radio mobile for telecommunications.
can you explain your points.
good day
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I'm interested. My email ID-farhanatasnimanti99@gmail.com. Thanks in advance.
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In the current project we are working with electromagnetic (EM) sensors for navigating medical instruments. The accuracy in experiments with phantoms reported in literature is around 1-2mm.
However, when EM tracking is used in the clinics, the accuracy is decreasing due to patient movement, breathing, pulsation, ... . Clinical studies with EM tracking systems in literature report higher tracking errors. Moreover, using an EM tracking system changes the workflow and the physician have to get used to it.
Therefore, I am interested in whether EM tracking systems are currently used in clinical routine. If this is the case, what is the experience of physicians using such a system?
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Thanks for your information. I look forward to the publication of your paper.
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I try to find a solution to the navigation problem. There is a navigation system consists of three navigation positions, forming two bases (one position belongs two bases) and emitting three different signals. It provides us the opportunity to get two navigation parameters - two Time Differences of Arrival. So we have two surfaces - hyperboloids. But I need to complement my system with another navigation parameter, like Time of Arrival to find the 3d coordinates of my position.
What should I use as the third parameter to get the simplest equations, expressing my coordinates?
It could be Time of Arrival only from one position; Time of Arrival between two positions. But it could be two Times of Arrival which provide me the opportunity of having more information.
How can I find the equations, expressing my 3d coordinates in this navigation system?
I have a system of equations:
x1 = a*cosh(m1)*cos(n1)
y1 = a*sinh(m1)*sin(n1)
x2 = b*cosh(m2)*cos(n2)
y2 = b*sinh(m2)*sin(n2)
alpha - the angle between the bases.
I can suppose that the bases are equivalent and m1=m2. Then I obtain the problem of intersection of tho circles. It is the right way?
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I will show you how to obtain the equations:
x₁ = acosh(m₁)cos(n₁)
y₁ = asinh(m₁)sin(n₁)
For m₁ = constant →
(x₁/acosh(m₁)) = cos(n₁)
(y₁/asinh(m₁)) = sin(n₁)
(cos(n₁))² + (sin(n₁))² = 1
(x₁/acosh(m₁))² + (y₁/asinh(m₁))² = 1.
Also, for n₁ = constant →
(x₁/acos(n₁)) = cosh(m₁)
(y₁/asin(n₁)) = sinh(m₁)
(cosh(m₁))² - (sinh(m₁))² = 1
(x₁/acos(n₁))² - (y₁/asin(n₁))² = 1.
We do the same argument for (x₂, y₂).
We assume non of cosh(m₁), cos(n₁), sinh(m₁) and sin(n₁)
is zero.
It is not clear what is the rule of alpha!
Best regards
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Energy waves are logical. Particle-wave duality has to navigate itself with the surrounding logical energy waves. All the information is carried literally and functionally by the energy waves (and the particale-wave duality)? So, could these logical energy waves (and particle-wave duality) inform us all the information which is out there?
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Information can be logically carried but are you sure we have the required mechanism for receiving and processing of such information?
Their are colours that the eye can't see and sounds that our ears can't hear,
So is there a perfect instrument for receiving and processing all the information?
Thirdly, if infinite information be processed by a finite mechanism, then there will be no infinite information, it will be finite and that is not true as the information is infinite.
So there is no way it's possible theoretically, unless otherwise.
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Navigating paradox does not only entail a solution to the problems that we are struggling with nowadays because of it or not, but it changes the nature of these problems that we had, have and/or having yet involve us in a thinking that is apart from the one we are used to. it takes us to a place where experience and reason coopete to deliver an answer that converges the divergent goals of a paradoxical tension along the way, we notice a change in our behaviour, a new sharpe and honed culture in our organizations and whole new set of problems that we did not even know they existed arise as we exploit more and more of paradox powers.
Hope you will meditate with me on my little small thought and help me get it as right as it can be for my second publication.
Best regards
Maci
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Dear
Ben Levin
Your reasoning is impeccable, also it is well aligned with the era when the brain was considered to be what it is and never change which is by the way not along ago. Developments in brain plasticity have given more insights than we could have ever imagined. I would recommend my introductory paper published on my profile. the question is not the question of utility nor the question of already existing means. the questions here above all are: : can we ignite and shape our brain plasticity to suit the requirements of given tensions of paradox. Can we develop an organization culture where an answer that does not satisfy two divergent goals is considered not enough? can we think and act on different level than the one we know? from this point onward the issues you brought become dependent on the bigger picture which allows us to even push harder taking in consideration that the nature of the paradoxes is abound and last but not least some paradoxes are not meant to be solved they just replaced.
I hope that would help with some new insights and i believe that once i am done with my research and finally some university grants me a chance to graduate everyone will have the chance to apply paradox tensions to their advantage.
please stay tuned i will publish my next article on the above concept very soon and i will upload it here right away.
my best regards,
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Dear Community, I am wondering if there are articles/books/references proposing implementations of Kalman Filters for positioning based on a single accelerometer ? (no GPS, no camera, no gyro, no odometery...)
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thank you Mohammed Aftatah
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Hello all,
I have a question regarding the implementation presented in paper titled "Real-Time Metric State Estimation for Modular Vision-Inertial Systems" by Stephan Weiss.
at Epoch 1: The monocular visual odometry starts at origin like IMU (both are aligned with world coordinate system). 
Epoch 2 is shown below, where visual odometry moves along Z-axis (in world frame), IMU moves along X-axis (in world frame) and the position of Camera (in world)
The update & correction will be visual frame (which moves along Z-axis).  For fusion to be successful, If we transform the visual odometry to IMU frame then they will be pointing in the same direction. 
Then our measurement vector Zp would also change or we use the same formula as in the paper?
Thank you very much for your suggestions and answers in advance.
  
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consult this work: Filtre de Kalman discret à la modélisation HydrologiqueFebruary 2019
Publisher: Editions universitaires européennes
ISBN: ISBN13: 978-613-8-46494-5 ISBN-10:613846494X
Project:
Multi-site modeling and prediction of annual and monthly precipitation
📷Samra Harkat
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Sir, I have only Broadcast Ephemeris files (Navigation file) so how can I calculate orbital errors?
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From the results obtained using the broadcast ephemeris (navigation file), you can analyze the accuracy level by comparing it to the coordinates of the precise final orbits file (.sp3), which can be downloaded via the following link: www.gnsscalendar.com
Precise ephemerides (final orbits) ensure high accuracy as it is postprocessed from data from various control centers. Thus, corrections are implemented that ensure the quality of satellite coordinates and satellite clock error.
Navigation messages, in turn, make it possible to determine the position of satellites in real time using time parameters, keplerian elements and disturbing parameters, which are obtained, for example, in RINEX (Receiver INdependent Exchange format).
Knowing the discrepancies in x, y, z, and the position (r) and speed (r ') of the satellite, it is possible to calculate (radial, along-track and cross-track) RAC orbits using the equations presented in the attached figures.
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Can anybody help me out with this problem.
I created a mesh with high quality in agisoft which works well as the project. But now its really difficult to navigate and visualize the mesh. I tried with agisoft viewer but it is not responding to view the mesh.
Hoping for the solution.
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you can try to open in global mapper
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- path planning robot simulation .
- 3D map environment model / robot workspace.
- mobile robot will autonomously navigate.
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Hello Ariff,
This choise it's up to you. There are lots of 3D environments and simulations such as Gazebo, MatterPort, MINOS, CHALET, THOR and Gibson. I have been studying on Gibson Environment based on pybullet. I can recommend it to you.
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I want get help to turn my title and intent into a hypothesis for a research proposal. The following are noted challenges:
· Depression in African American men, who have been impacted by the mandates & ramifications of the child support court system, such as revoked driver’s license, professional license, interest rates continue even when incarcerated, loss of job, under employed, large fees to pay child support online, subjected to annual maintenance fees----many of the aforementioned deficits has inspire drugs, alcohol, increased aggression, and suicide/homicide
· Hopelessness
· Navigating the court system to offer incentive for men who participates in counseling
· Navigating resources
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Primero que todo es necesario determinar los factores que impulsaron a los hombres afroamericanos a tomar ese rumbo en sus vidas, para poder establecer solución a los mismos y que se puedan proponer criterios específicos para cada situación, teniendo como consecuencia una limitación a las facultades discrecionales del juzgador en los casos de juicios de alimentos.
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Which Kalman Filters I can use for vehicle navigation
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Dear Oluwatobi:
It appears that you are not familiar with Kalman filter at all. So I suggest you start with basic textbooks (and take a course if available at your institute). A few excellent textbooks that I have followed for decades and benefited from are:
Brown, R. G. and Hwang, P. Y. C., Intro. to Random Signals and Applied Kalman Filtering, 4th ed, John Wiley 2012
Farrell, Jay A., Aided Navigation: GPS with High Rate Sensors, McGraw Hill 2008
Bar-Shalom, Y., Rong Li, X., and Kirubarajan, T., Estimation with Applications to Tracking and Navigation, John Wiley 2001
Rogers, R. M., Applied Mathematics in Integrated Navigation Systems, 3rd ed, AIAA Education Series, 2007
These books consider vehicle navigation. There are vehicles of various kind: land vehicles, ocean vehicles, atmospheric vehicles, space vehicles. But I assume you meant land vehicles which are considered in the above books.
There are several other books; for instance, by the authors: Grewal, James Farrell, and yet others.
For further correspondence with me, if needed, please write to me at hbhablani@iiti.ac.in.
Hari Hablani
Indian Institute of Technology, Indore, India
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While interdisciplinary researches are encouraged; discerning appropriate methodology to carryout these researches pose a challenge to many. Please advise on how to navigate through this conundrum.
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Mohammed, there is no single way of undertaking interdisciplinary research. When you seek to integrate theoretical perspectives across several bodies of literature, Repko* suggests a series of steps to achieve interdisciplinary understanding of a problem: identifying where disciplinary insights conflict, searching for common ground among those, which serves as a basis for their integration and ultimately producing a fresh understanding of a problem. Interdisciplinary investigation is reflexive, as it demands being self-aware and self-disciplined concerning personal and disciplinary bias, which could affect the process of evaluating the insights provided by different frames, and ultimately, the product of their integration. The overarching question posed by each discipline and its corresponding theories not only embodies its unique perspective, but also helps reveal subject bias in both the questions and responses it yields.
I am sure others will suggest more titles, but some authors I found helpful in my work:
Klein, J. T. (1990). Interdisciplinarity: History, Theory, and Practice. Detroit, MI: Wayne State University Press.
Lebow, R. N. (1988). Interdisciplinary Research and the Future of Peace and Security Studies. Political Psychology, Vol. 9 (3), pp. 507-525. Retrieved from http://www.jstor.org/stable/3791727
Repko, A. F. (2008). Interdisciplinary Research: Process and Theory. Thousand Oaks, CA: Sage Publications.
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The basic skills of mathematics test contains an understanding of visual representation mainly on real or laboratory activity. How to simulate the basic skills test? How to design the program through instructions and how to use and navigate through the class? An example: construct perimeter of not complete circle or other geometric figures.
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Thanks.
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Can anyone please navigate me?
Thanks
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Fibroblastic cells should attach much quicker (1-2hrs) than epithelial cells, so you can let them attach and pull off the supernatant which should have your primary cells. Primary epithelial cells typically take 24hrs to attach to the surface.
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Hey, we are studying the relationship between trait anxiety and spatial navigation. We have 20 participants and one navigation task with 12 trials. How to avoid for order effects among the trials? Help me, please. Thank you!
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create 10 random orders, with the constraints that no item is in the same position more than once, and that no item is followed by the same item more than once. the other 10 orders will be the reverse of the 10 that you created randomly. good luck!
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Is it possible that I use camera for taking the images and apply object classifiers and detection method like yolo and faster rcnn for object detection and then apply reinforcement learning algorithm for autonomous navigation? Does this approach helps me to navigate fast or not?
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Since they maintain a high computational cost, I do not know if they are appropiate for real-time
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Hello,
I have been looking for a correct methodology for Wind Turbine Inspection using Drone in Autonomous mode. Basically, it should be able to fly out as per the way-points assigned along with obstacle avoidance feature.
The main issue comes where I need to maintain a particular distance from the turbine all the way, what it should be?
Any other information related to way-point navigation methods are also welcome.
Thanks for sharing your knowledge and information.
NOTE - There is no need for technical specifications like autopilot or drone used. Because, I am looking for a precise inspection method. I already have a drone capable of doing all the required missions autonomously.
Thanks and Regards,
Garvit
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Jens Kleb That was quite a helpful input from you. That solves out quite a problem in terms of getting data with high accuracy. Though, I would still like to get some inputs from other colleagues regarding the Autonomous flight for such missions.
Thank you so much for your practical input.
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I am working on a project in which there is an intertidal zone in which there is a dregded navigation channel which is 45 km long and 600 m wide. The soil material in that region is Silty-clay with D50 of 0.003 mm. The entire navigation channel is always submerged and it has the maximum depth of 18 m. What I want to know is that what will be the angle of the most stable slope of the navigation channel which can be provided while dredging.? How to find out theoratically that value of the slope?
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You should perform a slope stability analysis
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I am implementing kalman filter using accelerometer and GPS sensor. I wanted to know how to obtain the value of Q which is the process noise model for kalman filter.
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We would like to add more sensors on Pob-Bot Robots in order to use it for investigation and safe navigation, how can we proceed using teh bUs or using Microcontroller and provide communication with its ARM?
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Thanks for the answer , I will provide the information to my student
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I was wondering if there are any sources where one can easily download normal tissue gene expression data. I am trying to compare the expression of a gene of interest between a specific cancer data set (which I have obtained from TCGA) to gene expression in normal tissue and am struggling to find a source where I can easily do this. I have read Gtex is an option, but one needs special approval to access that data. I have also read that TCGA has a way to do this, but I am struggling to navigate the site to access the normal data. Any guidance or insight would be much appreciated!
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As Andrzej Kudlicki said, GEO (https://www.ncbi.nlm.nih.gov/geo/) is a large repository and can help you a lot.
Complement, you can also search on ArrayExpress (https://www.ebi.ac.uk/arrayexpress/).
Best,
Leite
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I am a PhD student in wildlife biology in Hannover/Germany and I have come across a technical problem of my equipment that I cannot solve.
It would be fantastic if you were able to assist me:
I work with an infrared camera which includes a laser range finder, a GPS and a magnetic digital compass. During my data collection by night I measure distances from the loading area of my car. After checking my data I noticed that the azimuth is being calculated wrong by the device (from -25° to + 25°).
Follow-up tests have shown that the car is the disruptive factor. I have tried to calculate a correction factor by measuring objects around the car every 10 degrees in order to get a deviation table. I have performed that procedure with different calibration scores and in different places.
The errors in the azimuth show no regularity, therefore a correction of the azimuth is not possible.
The important fact acout the calibration procedure of the digital magnetic compass is that during the calibration, three cycles of four measurements are necessary and in different angles and degrees. The quality is displayed from 1 to 100. The manual says that scores from 1 to 8 are acceptable. Using a yardstick, I only got scores in a range from 11 to 16. Tripods keep sending magnetic errors - so I cannot use them.
My question is: Are there maybe any researchers - even physisist - who would be able to assist me, who might have an idea of how to calm down the digital magnetic compass next to a vehicle? This camera, Nyxus Bird, is usually used during military operations, so I cannot imagine that soldiers are always able to find an area without any metal or vehicles in order to get accurate measurements.
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help!
I am doing a research about object pose estimation based on monocular camera and laser ranger finder ,do you have some good literature for me,thank you very much!
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Yes, I know this and together with my colleagues we appreciate this VERY MUCH !
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A wonderful website, that have all the qualities: informative, regularly updated, beautiful, so intuitive it allows illiterate as well as Indonesian non-speakers to easily navigate. A great thumbs up to the live seismograph that allows us to follow live any ashes spit of Agung volcano in Bali( spits 16.500m high direction west).
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I think MAGMA is a best Web-GIS from Indonesian Goverment (Geological Agency, Ministry of Energy and Mineral Resources), its informative for public than others. However, the Web-GIS based on ESRI product.
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Hi,
I am trying to investigate if there is a difference between how students assess themselves in a learning activity versus how they are assessed by their peers. The context is a maritime simulator exercise where 2 students will be required to jointly navigate a ship in a simulator. At the end of exercise, i intend to administer two questionnaires to each student, in an effort to measure students performance as rated by themselves and by the other member in dyad. I want to know if there are any standard questionnaires designed to measure the same. I intend to adapt them for my research context. Any advise regarding this or suggestions will be heartily appreciated.
Amit
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There is a shift towards technology-enhanced assessment that allows student self-assessment to catch errors quickly and correct these before hand to improve final performance. The following manuscript sheds more light on the latter:
Best regards,
Debra
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Please describe the step by step procedure for the python installation for smooth running of CNN (convolutional Neural Network) on Laptop. I am using DELL Vostro 1540 laptop with 500GB HDD, 4GB RAM, 2.34 GHz clock speed. Already I installed pycharm for python but tensorflow is not installed. then I again trying through conda navigator , in conda jupytor notebook is not opened.
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Try this:
  1. conda create --name tf_py35 python=3.5 anaconda
  2. activate tf_py35
  3. pip install --ignore-installed tensorflow (you cannot install tensorlor-gpu, due to your notebook configuration)
  4. conda update --all
I hope this helps you.
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