netpatia

AirPrint in corporate networks

2011-07-18T08:51:00.004+02:00

AirPrint is a component of Apple since iOS version 4.2 for printing via WiFi, whose main advantage is that AirPrint does not require printer-specific drivers.The adoption of tablets is a fact nowadays, so the system administrators must provide some mechanism in order to allow tablet users to print. If we focus on iPad type of tablets, these are able to print via AirPrint, but just using a small

Multiseat is coming back with ubuntu 11.10

2011-07-10T20:35:00.000+02:00

Just a few days ago, the version alfa 2 of Ubuntu 11.10 was released. This version comes with some interesting changes, may be the most significant of them are the use of the branch 3 of the Linux kernel, as well as the use of Gnome 3.As you probably already know, multiseat is closely related to display manager, since it is a key component which allows the starting of multiple simultaneous

Setup your own DLNA server

2011-03-31T23:56:00.010+02:00

DLNA is a standards-based technology whose main goal is to ease the sharing of multimedia contents. DLNA is an open protocol based on UPnP.This article describes how to install and configure a DLNA server. This software is going to be installed on a home server. Just as a comment, this home server is a very low power consumption machine (Atom N550 board) running a very powerful OS: 64 bit CentOS

Download Flash videos

2011-03-26T18:38:00.008+01:00

Today there is a lot of websites with video contents. Most of them use flash as the platform to deliver the video contents to web browsers.There can be many reasons to prefer to download the contents instead on watching them online, but unfortunately, many sites do only allow to watch the video contents while the user is connected to the corresponding website.Older versions of flash player (

Android Market webstore: Change language

2011-02-03T18:04:00.006+01:00

After the opening of the Android Market Webstore, there seems to be many complains about the fact that the webstore selects automatically the default language based on the country associated to your public IP.Many people has been complaining about that, due to different facts: Countries with several official languages, people living or just staying not in their own country, companies accessing

Android Market Webstore

2011-02-02T19:44:00.003+01:00

Android Market Webstore has been just officially announced today.Now, you can find the Tilt Meter Android Application on the webstore.

Flash Player Square: Native 64 bit support

2010-09-17T21:27:00.011+02:00

On 15 September, Adobe announced in a blog the availability of Flash Player Square: A preliminary release of a future version of Flash player offering full native 64 bit support.You can find additional information about its features, as well as links to download this version on the Adobe website.Since the installation instructions for Linux are rather terse, I wrote the following instructions for

Android: Tilt meter for vehicles

2010-08-22T00:38:00.010+02:00

Just a few hours ago, the first version of my Tilt meter application for Android has been published.This is an application that shows the device orientation based on the readings from the acceleration sensor. Based on such data, the application can determine the inclination (frontal and lateral) of the device. Development turned out to be just a bit more complicated when the zero adjustment (

Flash Development on Linux (III): swc libraries

2009-09-21T17:51:00.013+02:00

In this stage, we already know how to set up our Flash development environment on Linux, and how to compile basic programs in Flash (Actionscript).If we intend to develop something a bit more advanced, it is very common to need precompiled libraries. These libraries are packaged in the form of .swc files, so we are going to know how to create such libraries, and how to use them once created.The

Flash development on Linux (II)

2009-09-16T19:25:00.008+02:00

Once you have set up your Flash / Flex development environment on your Linux box, you are ready to compile your first application.Open Eclipse with the AXDT perspectiveCreate your first project. This is done under the menu item File -> new -> AXDT project.... Give a name to your project and select a directory (usually under the directory that you chose as your workspace).After the creation of the

Flash development on Linux

2009-09-15T00:36:00.004+02:00

Recently I am getting more and more interested in flash development. Since the adoption of actionscript 3 (as3) as programming language Flash is becoming more and more a serious option to develop applicationsThe main inconvenient that I find is the fact that the development tools are almost just available for the Windows environment. This is an operating system that I stopped using almost two

Multiseat with nVidia card

2009-07-16T13:57:00.008+02:00

A new configuration of the dual seat system has been tested with a different hardware.Computer: HP dc7700 ultra-slim 1GB RAM, 250GB HDThe computer comes with an integrated Intel graphics card:$ lspci | grep VGA00:02.0 VGA compatible controller: Intel Corporation 82Q963/Q965 Integrated Graphics Controller (rev 02)Unfortunately, this card has only one output, so we had to replace the original card.

Multiseat in Ubuntu 9.04

2009-06-18T11:23:00.028+02:00

Multiseat configuration in Ubuntu 9.04 is very similar to that of Ubuntu 8.04. Some software components have been updated, so the overall system has some improvements over the previous version, while other problems are still remaining.The computer is just identical to that used in the previous version:Pentium 4 at 3GHz, 512MB of RAM and a 80GB hard disk. The video card is an ATI Radeon X300 PCIe

Fedora 11 on the Asus EeePC 701

2009-06-12T23:43:00.003+02:00

The linux distribution Fedora 11 (also know by its codename Leonidas) has been recently published, and it is available as a Live-ISO. So, I decided to download such image and create a Live-USB in order to test it on the Asus EeePC 701.Fedora 11 includes many improvements over previous releases in aspects such as security and virtualization. Additional improvements are also done in order to add

Ubuntu 9.04 on Asus Eee PC 701

2009-05-24T18:37:00.010+02:00

I have one Asus EeePC 701 since December 2007. Since then, I have tested several operating systems on this small computer, but my interests have focused mainly on the Ubuntu Linux distribution.As soon as Ubuntu 8.04 was available, I removed the original Xandros coming with the computer, and I replaced it with the Ubuntu operating system. There were some difficulties at the beginning, mainly

Multiframe DICOM to Flash video

2009-02-19T00:01:00.005+01:00

Following with the series of articles dealing with web based visualization of DICOM images, we are going to ilustrate a way of viewing multiframe ultrasound DICOM images.As in the previous article, we have used just open source software for every action or transformation carried out.This solution appeared in one ocasion when we were looking for a quick solution to share some cardiology studies

Flash DICOM viewer

2009-02-14T00:59:00.010+01:00

Some days ago, I passed the mark of seven years working in the field of healthcare related software. Due to the fact of working in this area, I have had the opportunity to learn about some topics and concepts that otherwise could remain just unknown for me. One of the topics that I find of particular interest is that related to medical imaging.There has been a huge work during many years in order

Beijing map

2008-05-29T01:36:00.004+02:00

Since the Beijing 2008 Olympic Games are approaching, I think it would be of general interest to have maps of Chinese cities available to people travelling to China.Google Maps does not provide maps of Chinese cities on its international version. Only some roads are shown on their maps. They have another different server (DITU) to provide maps of Chinese cities, but this server does not show the

Google Maps: Geocoder

2008-05-27T01:07:00.003+02:00

Looking for a geocoder?I have been doing some tests with the Google Maps API. The intention is to start a series of articles covering different topics related to maps, geopositioning and cartography.The first one is a general purpose geocoder. The geocoder allows you to obtain the coordinates of a point, either given its address or because you know its position on the map.Hope you will find this

Multiseat in Ubuntu 8.04 (III)

2008-03-24T12:27:00.002+01:00

<< step (II) <

Multiseat in Ubuntu 8.04 (II)

2008-02-21T01:24:00.006+01:00

<< step (I) <

Asus Eee PC: Hardware support in Ubuntu 8.04

2008-02-19T21:17:00.006+01:00

Software tested: Ubuntu 8.04 alfa 4 + updates available on 20080219Hardware environment: Asus Eee PC 4G (Black Galaxy)Wifi:The wifi chipset - Atheros AR2425 (AR5007EG) - is identified, and the propietary drivers are loaded.Sadly, right now, wifi can not be used unless you install the appropriate patches. The dmesg command shows an error message: Hardware revision not supported, so the driver has

Multiseat computer with Ubuntu 8.04

2008-02-19T11:54:00.018+01:00

The goal of this guide is to achieve a multiseat (also called multiterminal) computer so that more than one user can work simultaneously with the computer.Update (20090619): New tutorial for Multiseat in Ubuntu 9.04 availableIn our particular case, we want to obtain a computer for two users, and as a constraint we want to use only one video card. Obviously the card will be a multihead one.Our

Asus Eee PC: Install Ubuntu 8.04 on a USB stick

2008-02-15T01:21:00.012+01:00

Ubuntu, the popular Linux distribution, is catching the attention of more and more people every day.Many distributions today are available as live CD / DVD, so you can just test the new operating system with no modifications at all on your computer.There are lots of tutorials and howtos on the web covering the topic of the installation, but our goal and the reason of this post is a bit

Video of Ubuntu 8.04 multiseat computer

2008-02-13T00:57:00.002+01:00

At last, the prototye of the Ubuntu 8.04 multiseat computer is already running.We started working on that prototype with the alfa 2 version, and currently it runs under the alfa 4 one. During this time many bugs have been fixed and what seemed impossible to achieve one month ago, is a working computer right now.In this moment, we have a computer usable and apparently stable. Two people can use (

Coming soon: Multiseat in Ubuntu 8.04

2008-01-28T01:27:00.002+01:00

In three months the guys of canonical are releasing the next Ubuntu version. As they did with the 6.06, the 8.04 is a LTS (Long Term Support) version. That ensures three years of support (updates, security fixes, etc), so these versions are ideal for sites intended to be working for a very long period of time with a minimal maintenance (i.e. no intentions to do major version upgrades but only

Multiseat in Ubuntu 7.04

2007-05-05T11:48:00.001+02:00

The multiseat computer configuration has been carried out again on a new computer with the Ubuntu 7.04 release.The main difference in this installation is that a brand new computer has been used. The computer was equiped with a PCI-Express card (nVidia 6600), instead of using an AGP card as we did in our first installation.The big news are that the problems related to keyboard configuration seem

Google Maps + SIGPAC: Spain in high definition

2006-11-01T22:44:00.002+01:00

Interesting development carried on based on two very useful products. By the combination of each one's advantages, the result is a product that avoids the limitations of each separate one.On one side, Google Maps: The well known application offering satellite images (among other features) of the whole planet. This product has a nice interface very easy to use. Its only limitation, the areas in

Multiseat in Mandriva 2007

2006-10-20T01:27:00.002+02:00

I was on the web, looking for information on Xephyr, when I accidentally discovered an interesting feature. The Mandriva 2007 Linux distribution includes in the standard repositories a version of Xephyr with evdev support.In the changelog, you can find that the 'evdev' patch has been included:* Tue Jul 04 2006 Gustavo Pichorim Boiko <..mail@removed..> + 2006-07-03 11:05:06 (38323) - Removed the

Multiseat (VI): Final notes

2006-09-09T00:48:00.002+02:00

(...comes from step V)This project is just an evaluation prototype. It has been developed in a Hospital environment to determine if the computer on every medical examination room can be used simultaneously by two people.Currently there is a computer on every examination room. Through the computer, some administrative tasks related to the patient are carried on by a nurse. There is also a web

Multiseat (V): gdm and xkb

2006-09-08T21:39:00.002+02:00

(...comes from step IV)The next step is to configure gdm to indicate how to execute Xephyr.sh (the wrapper script). The call includes a couple of parameters (display and xauthority) that will be converted to environment variables . The other pair of parameters are the physical addresses of the input devices, that will be converted to the event numbers to be used as keyboard and mouse events.#

Multiseat (IV): evdev and Xephyr

2006-09-08T01:01:00.002+02:00

(...comes from step III)What is evdev?evdev is the generic input event device driver. It passes the events generated in the kernel (since version 2.6.8) straight to the program, with timestamps.The evdev driver is able to separate and distinguish events coming from different keyboards and mouses plugged into the computer. The xorg supports evdev input driver module since version 6.9/7.0 . This

Multiseat (III): xorg.conf

2006-09-07T19:06:00.002+02:00

(...comes from step II)Changes on the xorg.conf fileSince the system automatically generated a correct configuration file, this step is not really necessary. Anyway, if you need to obtain information about the bus in which your card is plugged, the lspci command will give you such data.Obtaining the information for the graphic card.# lspci | grep VGA0000:01:00.0 VGA compatible controller: nVidia

Multiseat (II): Let's start

2006-09-07T18:35:00.003+02:00

(...comes from step I)Step by step installationRequirementsFirst of all, obviously, we need the hardware. In the prototype here presented, we had this configurationComputer: Pentium IV 2.0GHz, 512MB RAM, 20GB hard diskGraphic card: nVidia GeForce 5200 AGP 8x, 128MB, VGA + DVI + TV outputs (the blue one on the picture)Seat 1: PS/2 keyboard and mouse, 17" CRT monitor (the right one in the photo)

Multiseat computer with Ubuntu

2006-09-06T20:15:00.008+02:00

After having spent many hours working with the goal in mind of achieving a multiseat (also called multiterminal) computer, I have decided to write some lines to help anybody interested in building this kind of system.Update (20090619): New tutorial for Multiseat in Ubuntu 9.04 availableThe concept of multiseatA multiseat computer is a particular configuration which allow a computer to be used for

Blogger, at last!

2006-09-03T21:01:00.000+02:00

Yeah!I told myself tens of times that I won't be writing a blog. I used to create and host my own websites to publish the contents which I considered worth being shared.Now I'm going to use for the first time a website managed by others, just to test and compare...Let's the show start!