Archive for the 'University' Category

Sometimes Java is just disgusting

This week I was learning for the assessment tomorrow: “Distributed Software Systems”. So I had a lot to learn about Servlets, XML-RPC, SOAP, REST, JRI and JMS. All of them are interesting technologies and I learned a lot!

But (a big but) most of the time it’s so hard and complicated to implement them with Java. For all of them (except RMI) you need an external framework who isn’t included in the Java SE. Even JMS although it’s a technology that is specified by sun! That means for every technology you have to deal with different types of documentations, different webpages and peculiarities of every API. There is no “standard” how such things are done in the Java world. I needed a lot of time to learn all the stuff and there is almost no framework where I can say now: “wow that’s cool”. RMI is here an except too. RMI is quite nice.

For me, more and more the only reason why Java has its right to exist is its platform independence. Due to the fact that the Java framework itself is not how I expect it from a framewrok that has such a big market share (and the reasons above are far not the only ones!)

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V1ru8 on July 3rd 2008 in Java, Regards

Status Update

After some time of silence (i had a lot to do for the University) I’d like to post what is going on with V1ru8.net. How you’ve seen, two weeks ago i released a new version of iPhoneNotes 0.7. I think thats a quite final version but maybe it’s the last version of iPhoneNotes because of the iPhone 2.0 firmware. If it has a proper implementation of Notes synchronization I will stop developing it and it is possible that I release it under GPL. So that’s all about iPhoenNotes.

Now I’m working on a new Project called Marks. It’s a small iPhone app for students to manage their modules, credits and marks.


I hope this application will be available at the App Store in mid june. If you have any ideas or wishes what should be included in this app - then let me know!

Now let’s start to search a vacation job. I’d like to get one where I can work on a software project. But there are just two weeks time so I think I try to get a vacation job at the company where I made my apprenticeship and administrate Windows NT domains :-(

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V1ru8 on June 16th 2008 in Management, Stuff, iPhone

Probability and Statistics with Mathematica and Excel

Mathematica:
Binomial: \binom{a}{b} \Rightarrow $Binomial$[n,m] Binomial

Average: \frac{1}{n} \cdot \sum_{i=1}^{n}x_i \Rightarrow $Mean$[\{x_1,x_2,\hdots,x_n\}] Mean

Median:\text{Median}[\{x_1,x_2,\hdots,x_n\}] Median

Modus: \text{Commonest}[\{x_1,x_2,\hdots,x_n\}] Commonest

Excel:
Binomial Distribution: P(X = k) = \binom{n}{k} \cdot p^k \cdot q^{n-k} \Rightarrow $binomdist$(k$,$n$,$p$,true/false$)

Poisson: P(X = k) = \frac{\mu^k}{k!}\cdot e^{-\mu} \Rightarrow $poisson$(\mu$,$k)

Hypergeometric Distribution: P(X=k) = \frac{\binom{M}{k} \cdot \binom{N-M}{n-k}}{\binom{N}{n}} \Rightarrow $hypergeomdist$(k$,$M$,$N$,$n)

Normal Distribution: \Phi_{\mu,\sigma}(x) = \Phi \left( \frac{x-\mu}{\sigma} \right) \Rightarrow $normdist$(x,\mu,\sigma,$true/false$)

\Rightarrow $norminv$(P(X),0,1)

Standard Deviation: \sigma := \sqrt{\frac{1}{n} \sum_{i=1}^{n}(x_i - \bar{x})^2} \Rightarrow $stdev$(x_1,x_2,\hdots,x_n)

Experimental Standard Deviation: \sigma := \sqrt{\frac{1}{n-1} \sum_{i=1}^{n}(x_i - \bar{x})^2} \Rightarrow $stdevp$(x_1,x_2,\hdots,x_n)

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V1ru8 on January 31st 2008 in Math

Helpfully functions in mathematica for cryptographic

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V1ru8 on January 4th 2008 in Math