Archive for category My job

Rant on Apache2

Recently I was trying to move my sites to SSL – for various reasons.
The test site went fluently, while the work machine refused to serve SSL content. While testing with ‘wget’, the error I received was

GnuTLS: An unexpected TLS packet was received.

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Meet the fMRI Parrot

fMRI Parrot

Camera
LG-D405n
Focal Length
3.2mm
Aperture
f/2.4
Exposure
1/20s
ISO
600

What the heck is “fMRI Parrot”?

First of all, the heck is fMRI. fMRI stands for “Functional Magnetic Resonace Imaging”, as defined in Wikipedia. It involves tons of expensive hardware, like Magnetic Resonance machine, and software, used to reconstruct the scanned volumes. During fMRI scanning a series of stimulus are applied to the patient and the brain is scanned using fast scanning MRI techniques. The aim of fMRI is to record immediate changes happening in particular areas of the brain.

The single MRI scan is called “volume”. It is created from a series of slices of the predefined thickness. Having more slices creates more detailed volume and extends acquisition time. As the changes of the brain activity are momentary, a short volume acquisition interval, named TR or “Time Repetition” is needed. Usually it varies from 7 to 1.5 seconds, depending on the capabilities of the MR machine. Short TR time supposes lower quality scans, compared to the “traditional” MR scanning. So the level of detail of particular volume is a trade off between time and specific requirements.

The fMRI scans consists from a number of volumes, recorded at particular intervals. The key condition for a successful scan is the precise timing. In order to find a region with elevated activity, a stimulus must be started just when the volume acquisition begins. For this the MRI machine may expose a short pulse – start of a volume. The pulse may be brought to the MRI control room via the interface box and the required stimulus started automatically. Some stimulus require the patient to respond, eg. press the predefined button. The response from the patient is also brought to the MRI control room. As there are special requirements for any hardware at the MRI machine, only certified equipment is allowed to the MR room. The requirement at the MRI control room are more relaxed as well as the choice of the equipment There are different vendors of the interface boxes and response buttons, NordicNeuroLab (NNL) being one of them.

In order to create the simulation series, or paradigmas in fMRI terminology, a lot of time is needed. Each paradigma is to be verified before the clinical test, while some of them can not be tested without a signal form the MRI scanner or a response from the patient. There is no need to say the MRI equipment is expensive, so is the time spent in the MRI machine. Most of the MRI scanner interface boxed can be used in so called “simulation” mode, sending particular responses at the predefined moments, without actually running the scanner. For example the Sync Box from NordicNeuroLab will send “S” symbol at the start of the volume acquisition, while fORP from Cambridge Reserch Systems is to send “5”. So what is actually required to test a paradigma, is the response from the scan… WAIT!

It’s must not be the MRI scanner nor the interface box.

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On the door handiness in Autodesk Revit

I was working on semi – automated solution to enter door handiness in Revit models. The existing solutions are either quite expensive (like Reforma Swing Direction) or has weird assumptions.

My intial setup is Dynamo and the Dynamo Door Set Handing module from http://archi-lab.net/. It has fine tutorials, so you only need to create your model in Dynamo.

The weird thing on door handines is it is different in some countries.

  • Door handiness in Germany is defined as hinge position on the door, when one is pulling the door to open. if the hinges are on the left side, the door is left-handed, and if the hinges are on the right side, the door is right-handed. I will refer it ad “DIN – style”.
  • The IFC, together with ISO 16739 defines door handiness as the position of “positive Y axis”, which is definitelly the position of door handle when puling.  I will refer it as “ISO – style”.
  • Americans use ISO style, but also has “reversed” option. I still have no idea on this option, as “reversed right” is “left”.

So, what’s to do?

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Revit and IronPython: the early bird

ODS module does not work on IronPython, and i don’t know the way to add Revit modules to regular Python.Whatever …

''' cut-n-paste from the net
 @author: ejs
 '''
 import clr
 import sys
 clr.AddReference('RevitAPI')
 clr.AddReference('RevitAPIUI')
 from Autodesk.Revit.DB import *
 from Autodesk.Revit.DB.Architecture import *
 from Autodesk.Revit.DB.Analysis import *
 
 #sys.path.append(r'C:\Python\3.4\Lib\site-packages')
 
 #from odslib import ODS
 
 #ods = ODS()
 
 uidoc = __revit__.ActiveUIDocument
 doc = __revit__.ActiveUIDocument.Document
 
 cView = uidoc.ActiveView
 
 collector = FilteredElementCollector(doc)
 collector = FilteredElementCollector(doc).OfClass(ViewSchedule);
 
elems=collector.ToElements()
 n_elems=len(elems)
 
 for elem in elems:
     if cView.Id == elem.Id: Read the rest of this entry »

Search engine providers for Firefox and MS IE

I’m lazy person.
Here are search engine providers for Firefox and MS IE web browsers.

I’ve added keywords for these search engines, like evt for Evita.lt, lmn for lemona.lt. Now, searching in particular site is as easy as Lotus 1-2-3: type in keyword and the term you need to search in the address bar. So, typing lmn ds180 will search for ds180 in Lemona.lt site.

Firefox Lemona.lt Evita.lt Datasheetcatalog.com
MS IE Lemona.lt Evita.lt Datasheetcatalog.com

Cheers.

Managing HP P400 RAID card

It’s a summarising memo from the last Saturday.
What supposed to be slowish disk, actually was dead drive on array.
Thanks for the supplier, the entire collection of SAS drives was just waiting to be installed.

It’s possible to configure RAID adapter from the BIOS stage, but it’s more interesting to configure it on the live system. What you need is configuration tools for the adapter card. And they are called “hpacucli”. Ok, ‘CLI” stands for “Command Line Interface”, “hp” is too obvious. “A” could be for “array”. What “cu” stands for?

Debian repository is at http://downloads.linux.hp.com/SDR/downloads/ManagementComponentPack/pool/non-free/.

Get it, install and read on.

Run “hpacucli”, it should be located in /usr/sbin.

To get information on installed RAID cards, use

ctrl all show

The utility can warn you on the recommended firmware upgrade and will print the controller(s) information:
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Case story: move the location of Revit Server 2012 models

Here is the other issue: due to the fast install of Revit Server 2012, the location of model was not important. After the server’s role was changed to “Central” instead of ‘Caching”, i wanted model be stored in more predictable location.

Again, I had no wish to reinstall the whole server, including w2008r2 server.
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Case story: change role of Revit Server 2012 without reinstall

Our company was running a caching Revit Server 2012 instance, to be able to work on a project. The central server was set in the kingdom of far away and was serving three architectural offices.
Recently we had to take care of the model created and the Revit Server 2012 instance itself. I hate to touch working system, but i had to.
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Where is my free space, windows, where is my free space?

I had a strong wish to install Autodesk Revit 2013 just a days ago. Besides it needs 38 GB of free space, it did not fit on my clogged 100 GB system drive.
Too bad. Ok, my drive is oldish 160 GB Seagate, but still, windows7 seems like a disc hog.

So i’ve decide to investigate the case. Using RidNac, i made a small tour to the HDD space. Read the rest of this entry »

Using Revit Server 2012 by non-domain members

The last issue in the Migration Hell was Revit Server. To be precise, not the application itself, but the client authentification.
With all it’s bells-n-whistles, it lacks most part of the documentation. The application itself runs on IIS, uses Windows (NTLM) or Basic authentification, but nothing is said about the Revit client. The only thing you can find – you must login as domain member to use the Revit Server.

It’s not true. You should, but must not.

Two things must be done on the client to use Revit Server:

  1. authenticate in the domain and every server you will need to use. You must use your domain login credentials to authentificate. The AD domain uses trust relations to authentificate you in the domain servers. If you prefer not to login to AD domain, you must take care of it by yourself
  2. change environment variables.
    • %USERDOMAIN% point to the current domain, if logged as domain member. If not, it’s pointing to the computer name. Setting the variable to the domain name needed (eg. SET USERDOMAIN=MYCOMPANY) will do the job. You should not use DNS domain name, eg. MyCompany.COM, it’s set in %USERDNSDOMAIN% and is useless in the case of Revit Server
    • %USERNAME% must be set to your AD’s username, without AD prefix or FQDN suffix. Eg. if your AD domain login is mycompany.com\PerfectUser or PerfectUser@Mycompany.COM, use “SET USERNAME=PerfectUser”.

That’s all. Enjoy.

PS: if you use Local Revit Server, and Central Server is located somewere in the Other Domain, you will probably need to authentificate to the Central Revit Server too. Not sure about this.

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