June 15, 2014
This spring I took an online course from Coursera, Irrational Behavior, as taught by Dr. Dan Ariely. It was a fascinating course, one that I enjoyed immensely.
Irrational Behavior with Dr. Dan Ariely on Coursera
See my comments on the course from my previous post on Irrational Behavior and Hoarding.
The other writing assignment in the course, was to “Design An Experiment”. In this course, “experiment” refers to a psychological experiment. Not a physics, chemistry, or computer science experiment.
From the guidelines – “Design An Experiment” – Please include the following in your paper:
A brief summary of previous (relevant) research. Be sure to use and cite at least one piece of research or theory that your experiment builds on.
Research question. What do you want to find out?
Your hypothesis. What do you think you will find?
A brief overview of the proposed design including identification of your independent and dependent variables. For more details, check out this guide.
Implications. If your study turns out the way you expect it to, what does that mean?
I’ve often thought of the shortcomings of resumes. As so, in many ways, using resumes is rather irrational. So, I designed an experiment to test the variability of resumes. Read the rest of this entry »
June 12, 2014
This spring I took an online course from Coursera, Irrational Behavior, as taught by Dr. Dan Ariely, in conjunction with Duke University.
Dr. Dan Ariely Cartoon
It was a fascinating course, one that I enjoyed immensely. Different weeks focused on different subjects: Decision Illusions, Money, Cheating and Crime, Work, Self control, how emotions affect decision making. There was always another great insight about human behavior from some experiment that Dr. Ariely or other researchers had conducted.
Part of the class involved some writing assignments. The first assignment was to write a paper to solve a problem, using the principles covered in the Irrational Behavior course.
From the course guidelines, “Solve a Problem”:
There are three parts to this assignment: 1) Describe a problematic behavior 2) Outline existing research 3) Propose a solution. Basically, you will come up with a research-based solution to a problem, applying something that you have learned in this class to a real world problem
I’d seen those shows on television about hoarders, and I decided to apply the Irrational Behavior concepts to hoarding. When you think of it, it is a most irrational behavior.
Read the rest of this entry »
June 8, 2014
In 2004, I gave a tuning presentation in the Boston area at NOUG
If you haven’t seen it, do take a look. It actually went viral and I received emails from around the world.
The PDF can be found here:
Recently, I gave a tuning presentation at the Manitoba Oracle User’s Group
This MBOUG presentation is a follow up. It covered a number of very mysterious tuning scenarios that I’ve encountered since NOUG, and the techniques I used to overcome them. In these cases, using optimizer and indexes usually did not help at all.
The PDF can be found here: Read the rest of this entry »
June 6, 2014
In April 2014, I gave a presentation at my Alma Mater, the University of Winnipeg: Graph Databases – Overview and Applications
It was presented to the faculty and students of the Applied Computer Science Master’s program.
Most had not seen graph databases before. However, I expect that some of them will be using graphs in the near future. :)
A PDF of the presentation can be found here:
Read the rest of this entry »
March 29, 2014
Lately, I’ve noticed a pattern with my blog. So many of my posts rise to the very top of the search engine results. Cool!
Often it’s the number one result. Other times it’s near the top of the first page: the second, third, or fourth result.
My Posts Rise To Top Of The Search Results
As you can tell from my posts, I haven’t done a whole lot with internet Search Engine Optimization (SEO). But I sense that much of the reason why my posts rise to the top is that I always give the correct and complete answer to the difficult problem at hand. It’s not speculation or guessing. It’s a tried and true solution that I worked through and tested. Often over days of research. And sometimes over a week or more!
Often in my blog’s analytics, I see big engineering companies looking at my blog posts. Oracle Corporation Read the rest of this entry »
March 4, 2014
Have you seen the map of all the different databases on the market today from 451 Group?
Database Landscape map – June 2013
There used to be just a few relational databases: DB2, MYSQL, Oracle, SQL Server, Sybase.
Now, there are actually twenty (20) different categories of databases! And well over 100 different vendors.
How many can you name?
How many have you installed?
How many have you used?
The full article is here:
December 28, 2013
Arterial Pulse Waveform
Recently, I saw a Master’s thesis defense at my Alma Mater, the University of Winnipeg, Applied Computer Science. Jingjing Xia analyzed the shape of heartbeats in patients known to have different diseases. By applying math and algorithms, she was able to find strong correlations between the disease, and the shape of the heartbeat.
Pulse wave analysis has actually been around since Mahomed wrote about it in 1872 and there has been more research since then. Researchers have studied the shape of the heartbeat, made measurements of the different sections of the graph, and applied math to it.
First, Xia determined an equation to fit the pulse wave, a complex sum of eight sine waves. Then the first and third derivatives were taken from the equation. From the derivatives, the locations of different points of the heartbeat were able to be identified: the wave foot, systolic peak, and reflected point. From these numbers, the Reverse Shoulder Index (RSI), and Ratio of Distance were determined.
Once all the numbers were known, correlations were run between the different measurements and the known diseases of the patient. They did find a number of correlations between the heartbeat’s pulse wave, and various cardiovascular diseases: coronary heart disease, hypertension, and chest pain.
One thought is that this has a lot of the ingredients of data science: mathematics & statistics, computer science & algorithms, data and a distinct subject area. Read the rest of this entry »