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After having to register at one more website, and hitting stupid restrictions on the Username (no spaces or special characters), I'm wondering why we still have programmers restricting things like that.
Is there a concensus on the methodology of allowable usernames?
Often it's based on technology restrictions. For example, if your UIDs are going into a database, they have to be sanitized. Rather than try to catch all possible exploits or problematic values, many developers choose to restrict their UIDs to alphanumeric characters.
Also, when integrating with legacy systems, sometimes there are limitations already in place - perhaps the "username" field is only 6 or 8 characters long.
Ultimately, there's usually not a good engineering design reason for doing this, since a username should not be used in any meaningful calculations, but there are often good business reasons for doing so.
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I am new to software engineering and also I like to learn whatever new. I must be very thankful if someone help me to provide further information about How is a UI evaluated?.
Any help regarding to this matter is highly appreciated.
In common, evaluation of User Interface can be based on three common elements
• Functionality
• Aesthetics
• Performance
Functionality
Is the application usable?
Does it enable users to complete tasks?
Aesthetics
Style
How it influencing the users
How shown and presented?
How colors complement each other?
How UI elements convey their meaning?
Performance
Measured not only by speed, but also reliability.
Reliability (Even though an application looks good and feels great, crashes repeatedly, it likely won’t be very successful)
Should provide a user with full confidence.
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I'm very impressed to how plagiarism checkers (such as Turnitin website ) works. But how do they do that ? In a very effective way, I'm new to this area thus is there any word matching algorithm or anything that is similar to that is used for detecting alike sentences?
Thank you very much.
I'm sure many real-world plagiarism detection systems use more sophisticated schemes, but the general class of problem of detecting how far apart two things are is called the edit distance. That link includes links to many common algorithms used for this purpose. The gist is effectively answering the question "How many edits must I perform to turn one input into the other?". The challenge for real-world systems is performing this across a large corpus in an efficient manner. A related problem is the longest common subsequence, which might also be useful for such schemes to identify passages that are copied verbatim.
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Bob and Alice each have a bit string they want to keep private. They each want to know what the logical AND of their two bit strings would be without telling the other or anyone else their actual bit strings... how can they do this? Keep in mind that even once they both hold the AND of their two bit strings, they should still not be able to calculate the other person's string exactly (unless of course one of their strings was all 1s).
I know that I have seen something similar before in some sort of key system/voting system but I couldn't remember the details. It has to be something like make a private random key, xor it and use that somehow... but I couldn't work out the details. Any clever encryption people out there?
I think that you are looking for homomorphic encryption systems, in which it's possible to do computation on encrypted values without ever exposing what those encrypted values are. This encompasses a far more general set of problems than simply computing bitwise AND.
Hope this helps!
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I want to generate some fake people for a piece of software I'm writing. These people also have ethnicities, and I'd prefer not to have names that don't look totally out of place when compared to those ethnicities.
My first idea was to base it on data. There is a table of first and last names from the 1990 US census with attached frequencies, but that says nothing about ethnicity. There is also a table of last names from the 2000 US census which is broken down by ethnicity, but it says nothing about first names.
So I need some way of generating first names based on ethnicity. Any ideas?
Use behindthename.com. They have very extensive lists of names by usage, including lists of popular names.
The site http://www.babynamefacts.com/ contains lists of most popular baby names per country. This may be a good starting point. For example, this page shows the most popular baby names for Serbia in 2009: http://www.babynamefacts.com/popularnames/countries.php?country=SRB .
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Well I have been asked to validate passport numbers (the documents used on airports to travel to other countries).
My question is: What format are these "numbers"? All I know is that they can have letters but I am not finding any place defining the rules. Any pointers/Links?
I don't think you're going to be able to do this without restricting yourself to certain issuing countries. If you look at the specs of machine readable passports:
http://www.highprogrammer.com/alan/numbers/mrp.html
It says that each country is free to use any format it likes for the actual passport number (including letters or digits). Although in the machine readable schema these seem to be limited to 9 characters (which might cause problems for countries with billions of citizens if they were to just use digits!)
I would expect the format to depend on the issuing country.
UK passport numbers consist of 9 digits but used to consist of 6 digits and a letter.