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Last Build Date: Sat, 23 Dec 2017 09:39:55 +0000


Is ZCash the Answer to Bitcoin’s Limitations?

Mon, 27 Mar 2017 18:52:01 +0000

Bitcoin has been around for a while now, and a few large issues have turned up: Transactions per second: The block size limit imposes a 3 transactions per second (tps) limit for the whole network. A far cry from the 2000 tps that VISA processes on average. Privacy: Absolutely everyone can see all your transactions. Bitcoin’s... Continue reading »

Bitcoin and the Steady-state economy

Sat, 22 Feb 2014 08:50:58 +0000

Bitcoin is rapidly gaining popularity. Despite the recent problems with the Mt.Gox bitcoin exchange, I think the Bitcoin protocol itself will prevail, and more and more people and businesses will start to use it. I’ve started to experiment with using Bitcoin myself, and found that it works really well. For instance, the Android Bitcoin Wallet makes... Continue reading »

Who is Googling You?

Wed, 03 Oct 2012 11:15:35 +0000

I recently watched “Du är googla” (You’ve been Googled) on NRKs web-TV. It has a few interesting points, and one which I found particularly interesting is how much the Google search results on your name matter. So, knowing a thing or two about Google and AdWords from my time working for Google, I set out to... Continue reading »

OptiMap version 4 is here

Wed, 25 Jan 2012 10:29:00 +0000

Hold down shift while pressing reload to make sure the page fully reloads if OptiMap appears broken. The first thing you’ll notice is a complete makeover of the user interface. The functionality has grown considerably since I first posted OptiMap in 2007, and the controls were scattered randomly around. Now, they are organized into neat... Continue reading »

Introducing SkyLib

Fri, 04 Nov 2011 15:19:10 +0000

For a long time now, my mantra has been optimization. To make the most out of limited resources makes sense both economically and environmentally. OptiMap was an example of this. Driving too far is just stupid. Using OptiMap saves you time and money and it saves the environment too. There are many other wasteful behaviors we... Continue reading »

The Dynamic Programming Algorithm for the Travelling Salesman Problem

Fri, 24 Jun 2011 09:52:00 +0000

A reader asked me for some information on how the dynamic programming algorithm for the TSP works. I was surprised to find that a Google search found no good resources. Wikipedia merely acknowledges its existence: “One of the earliest applications of dynamic programming is the Held–Karp algorithm that solves the problem in time O(n22n).” Consider the TSP problem with N+1... Continue reading »

OptiMap for Google Maps v3 released

Fri, 03 Jun 2011 10:10:54 +0000

After being “almost ready” for way too long, the next version of OptiMap, based on Google Maps API version 3, is now launched. While I have tested most aspects of the application, there are most likely bugs, since the update touched almost all areas of the code. There are some improvements too, however: More robust... Continue reading »

Japan Radiation Map

Thu, 17 Mar 2011 10:23:28 +0000

I’ve created a map which shows the measured radiation values in Japan (note that this map is no longer online – the rest of this post is out of date). The data is scraped (credits go to Marian Steinbach) every 10 minutes (hit refresh to get the newest data). You can also click on each measurement... Continue reading »

The Financial Crisis pt II

Tue, 01 Feb 2011 17:56:39 +0000

It’s gearing up for the next round of financial crisis. While our so-called leaders have enjoyed their annual back-patting exercise at Davos, I have become exceedingly alarmed by what’s currently going on in the commodities markets. Food, energy and metals have all sky-rocketed during the last five or so months. While the financial markets have... Continue reading »

Embodied Energy

Sun, 06 Jun 2010 19:47:40 +0000

Embodied energy is the amount of energy that goes into a product during its entire life-cycle. It includes the energy required to mine and refine materials, assemble these into the final product, transport it to the consumer, and dispose of it. An analysis that considers this entire process is called a life-cycle analysis. A 1-litre... Continue reading »