René Pickhardt on December 28th, 2011

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Excerpt: 2011 is almost over and more than 9 months of my PhD have already passed by. During my math diploma I was founded by the german national academic foundation. Besides some really nice benefits that came along with this every 6 months I was forced to write reports about my study progress. Even though theses reports were sometimes quite annoying I realized that they are a good method for oneself to focus and work more efficient. That is why I decided to continue writing these reports. This time just in english and for a wider audience. So here is the layout…

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Excerpt: I created some exercises regarding binary search trees. This time there is no coding involved. My experience from teaching former classes is that many people have a hard time understanding why trees are usefull and what the dangers of these trees is. Therefor I have created some straight forward exercises that nevertheless involve some work and will hopefully help the students to better understand and internalize the concepts of binary search tress which are in my oppinion one of the most fundamental and important concepts in a class about algorithms and data structures. Part A: finding elements in a binary search…

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René Pickhardt on November 27th, 2011

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Excerpt: In the end of September I discovered an amazing data set which is provided by Google! It is called the Google n gram data set. Even thogh the english wikipedia article about ngrams needs some clen up it explains nicely what an ngram is. http://en.wikipedia.org/wiki/N-gram The data set is available in several languages and I am sure it is very useful for many tasks in web retrieval, data mining, information retrieval and natural language processing. This data set is very well described on the official google n gram page which I also include as an iframe directly here on my blog. So let me…

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Excerpt: UPDATE: the paper got accepted at SOCIALCOM2012 and the source code and data sets are online especially the source code of the graphity server software is now online! UPDATE II: Download the paper (11 Pages from Social Com 2012 with Co Authors: Thomas Gottron, Jonas Kunze, Ansgar Scherp and Steffen Staab) and the slides I already said that my first research results have been submitted to SIGMOD conference to the social networks and graph databases track. Time to sum up the results and blog about them. you can find a demo of the system here I created a data model to make retrieval of social…

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Excerpt: #1: Sorting huge files Sorting big files might not be as simple as just implementing an sort algorithm. As soon as the file does not fit in memory any more smarter implementations have to be applied. One way is to sort the file on the hard disk. We remark that not every algorithm is easily adopted for this kind of task. So your task for the exercise is to decide what kind of alogrithms are good to solve the problem and what approach to handle huge files could be taken? Discuss what kind of operations are efficient while retrieving / processing data…

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René Pickhardt on November 13th, 2011

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Excerpt: Today I have figured out that you can download a lot of statistics about your on videos from Youtube. That is actually very nice since I was always sceptical that you miss the knowledge of who is watching your videos once you do not host them yourself. Unfortunately there are some drawbacks to these statistics:  Youtube only lets you download statistics for a periode of 30 days. So if you want to download your statistics for an entire year you have to download 12 files.  Next the statistics are only available as rawdata and you need to process them in order to receive…

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René Pickhardt on November 10th, 2011

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Excerpt: After building the In legend Youtube DVD I was able to convince my band mates that it is quite useful to use Youtube ads in order to reach new fans and promote our new videos. I have to say that I am not very experienced about youtube ad marketing but of course I understand the basics behind keyword marketing and I can calculate some numbers. So I decided to give it a try! Before I blog all my experiences and mistakes I would like to discuss a few more things about promoted videos on youtube in gerneral and why…

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Excerpt: Binary Search http://en.wikipedia.org/wiki/Binary_search_algorithm is a very basic algorithm in computer science. Despite this fact it is also important to understand the fundamental principle behind it. Unfortunately the algorithm is tought so early and the algorithm is so simple that beginning students sometimes have a hard time to understand the abstract principle behind it. Also many exercises are just focused on implementing the algorithm. I tried to provide an exercise that aims and focusses on the core principle of binara search rather than implementation. The exercise is split into three parts. Excercise – Binary Search Your task is to write a computer program that…

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René Pickhardt on November 2nd, 2011

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Excerpt: During the last month my blog was rather quite. I dicided that I was aiming to submit my first paper to a top conference with a deadline of november first. Well besides the fact that I almost forgot about the fact that I also have a private life – as well as my collegues helping me with the paper – there were several lessons learnt: If your advisor tells you that the deadline is to short he is probably right! We beat the deadline but the cost for doing so was really high. Physicists rock like hell. Evaluating my algorithms I did…

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René Pickhardt on October 28th, 2011

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Excerpt: Recently I was rather quiet in my blog. Currently I am writing my first research paper for SIGMOD which takes 90% of my resources. In my very limited time I had the chance to work on a very cool web project about which I want to share some insights and talk about today. Inspired by the master thesis of Stefan Wilk about his research on navigable hyper video systems I had the idea of using Youtube navigation links and jpg graphics to create a DVD. I talked back to Robert Naumann and the guys from In Legend who were about to…

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