Welcome to TechScreen

Welcome to the TechScreen site. This side shall support the exchange of knowledge in the domain of Web Engineering and related aspects. As a side effect, this side is used for research on knowledge management technologies. User can pose challenges in the problem domain and can participate in quizzes. Further a bibliography about arcticles in different related domains is continously extended. Finally, questionnaires on different issues are provided. To be able to participate you need an account and a password from TU Wien's TISS system.

Data property restriction in an ontology

An ontology can define a wide variety of objects, which you can define with different semantic web standards such as OWL. While there are many different ways to describe objects and relations such as subclasses and object properties I want to look at the data properties now. With that I mean is that I want to define an object with a simple data which has a restriction. An example would be "A human has an age property which cannot be negative."
Submitted by Jakob Felix Schneider on Tue, 11/29/2016 - 17:51

GET request from a REST-Service

A REST-Service is one of the modern ways web services communicate with each other, meaning how they transmit data to each other. Because of the prevalence of REST-Services on the web the problem described is a very common one nowadays and one of the most used communication ways is via a JSON file. So how do you GET and save a JSON file which is available on a REST-Service.
Submitted by Jakob Felix Schneider on Tue, 11/29/2016 - 17:26

<div> centering

While sounding like a simple task, many people have had problems with it in the past. Centering in general norizontally and vertically is always a problem on websites. A problem for this I assume is that it is hard to define an anchor object for the object to center. A <div> object in HTML can be used in many ways and is used to group other elements together and can be thought of as kind of a box.
Submitted by Jakob Felix Schneider on Tue, 11/29/2016 - 17:09

Integrating a legacy Swing application in an Eclipse RCP application

The following points have to be considered: <ul> <li> Bidirectional synchronous and asynchronous communication has to be possible. </li> <li> It is not allowed to just copy the whole legacy Swing application into the Eclipse RCP application. </li> <li> The legacy code is still in use and so the changes on the Swing side has to be minimal </li> </ul>
Submitted by Mario Luef on Tue, 11/29/2016 - 14:56

Reading sam and bam files

Which library or program can be used to read and manipulate files with nucleotide sequence alignment, ex. .sam or .bam files.
Submitted by Magdalena Malenda on Mon, 11/28/2016 - 14:06

C++ error

Why do I get "undefined reference to 'vtable'" error in my c++ program? Abstract classes and virtual methods are used. How to fix this?
Submitted by Magdalena Malenda on Mon, 11/28/2016 - 14:04

Encrypting and decrypting emails by S/MIME

How to encrypt and decrypt emails to ensure to the email recipients that you actually sent the email and to have the possibility to check if received email is authentic. Which tools can be used to achieve secure S/MIME email?
Submitted by Magdalena Malenda on Mon, 11/28/2016 - 13:57

How to watch videos blocked in your country?

The problem is, that you connect to the internet in some country - and want to watch a video or a stream from an other country, but you get a "This video is only available in... " message. But you need to see the content immediately, so travel is not an option. Even if you'd pay for the content, you cannot have immediate access
Submitted by Asztrik Bakos on Wed, 11/23/2016 - 22:03

How to draw BPMN diagrams easily?

We successfully defined a process, and now want to model it in some form of collaboration. Since BPMN diagrams have a given form and allow only a set of shapes, using services like Google Draw might not be sufficient or practical. We also need to have a way to share the diagram or to be able to transfer it in an easy way.
Submitted by Asztrik Bakos on Wed, 11/23/2016 - 21:58

How to get WiFi to an old PC?

Suppose you have a wireless router at home and also an old PC in a room further away. The old PC has no usb, nor WiFi interface, only ethernet, but you wan to use it anyway as a simple webserver. Or you just want to have the same network in a two-story building on the other floor than you router is - all this without cabeling, using AP-s.
Submitted by Asztrik Bakos on Wed, 11/23/2016 - 21:51

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