Diary, August 2017

Sun Mon Tue Wed Thu Fri Sat
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 13  14  15  16  17  18  19
 20  21  22  23  24  25  26
 27  28  29  30

Wednesday, August 2, 2017

Book

At 15:09, I bought the book Groninger Museummagazine. Jaargang 27, no 1 edited by Steven Kolsteren, Willemein Bouwers, and Rudo Menge, written in Dutch and published by Groninger Museum in 2014 from thrift store Het Goed for € 0.50.

Tuesday, August 8, 2017

SHA2017

At the end of the afternoon, I returned from SHA2017 hacker camp, where I went to with some people from TkkrLab. This is the first time I went to such a camp and I had a great time. In the evening the camp was like an open-air disco with music and lightshows everywhere. One evening there was an event on the camp with home built vehicles, including riding pieces of furniture and also a KarTent on weels. I wrote two more badge apps: One for upcoming events (based on code from Event Schedule) and one named FFAA5E for setting random 'orange' pixels on the Pixelflut LED wall. Sunday morning, I bought the brain machine from Mitch Altman. I was a parking angle and did six shift with a total of about sixteen hours for which I was rewarded with meal vouchers and allowed me to enjoy the fantastic (mostly vegaterian) meals cooked for the volunteers. Notable talks I attended are:

SHA2017 Opening. (Video.)
Colors at SHA2017: flag colors on the screen, in print and in paint by Christel Sanders, also known as Boekenwuurm (twitter).
The Security and Privacy Implications of AI and Machine Learning. (Video.)
Automotive microcontrollers. Safety != Security. (Video.)
The Code of Life by Bert Hubert. A very interesting talk by a very good speaker. Together with the follow-up workshop one of the highlights for me. (Video and slides.)
Network concepts introduction & wireshark workshop by Kirils Solovjovs. An interesting talk, but I left early because it was mostly about things I already knew and felt could have explained better myself. (Video and slides.)
Zero to chiptune in one hour by Matt Westcott. Great performance! (Video and finished song.) He also coded the 2048 game for the badge.
Computational Thinking by Pauline Maas. (Video.)
Off<>zz Code and Piano Concert by Anne Veinberg and Felipe Ignacio. Great performance (the second half at least, because I missed the first part). (Video.)
The World in 24 Hours Revisited by Josephine Bosma, which is about the project The World in 24 Hours organized by Robert Adrian. (Video.)
Subtle and Not so Subtle Sexism by Nuala Gray. I was not planning on joining this workshop but went there to make sure I had a chair for the next workshop (which I am not going to include, because I felt asleep out of boredom, I guess). Although I did not join in immediately, I was very happy to have joined it, because it was very good and it was a pitty it had to be closed due to time constraints.
DNA: More greatest hits by Bert Hubert, which was a continuation of the yesterdays talk. The room was packed and the projector did not work well. This should have been scheduled in one of the larger tents. Afterwards the discusion continued outside of the tent. (Video and slides starting from page 78.)
I have a dream by Jos Weyers about Beehive Techcampus 4.2. (Video.)
Nerd-Wrangling 101 by Meredith L. Patterson and Julian Finn, who are working at Upstanding Hackers. Very interesting talked. I learned about the difference between affective and cognitive empathy and come to the realization that my affective empathy is not very strong. I do notice emotions of others, but I am usually not affective by them. (Video.)
Ethics in Technology. I only saw the last part of this talk about the RIPE Atlas. (Video).
Hacking Behavioral Economics by Nuala Gray. Again, a very interesting and interactive workshop by her.
How an intern hacked the powergrid by Willem Westerhof. (Video and slides.)
Di[CENSORED]s for privacy. A talk that the speakers were forced to give because there was no delete button in the system to enter your talks and thus they changed the title of their talk into something that they thought would be rejected anyway. (Video.)
SHA2017 Badge. (Video.)

I have not taken off the SHA2017 wristband now that I got used to it. Maybe I will start collecting festival wristbands like I saw some others do.

Sunday, August 13, 2017

Who Stole My Spear?

This morning, I finished reading Who Stole my Spear by Tim Samuels, which I started reading on July 24, after I bought it on July 22. I found this a very interesting book. The book states that although in our modern society men are still in the majorithy in the higher regions of society, the bare facts are that in many areas men on average fare worse than women. The author argues that men have a harder time dealing with our modern society, which diverts furhter and further from our ancestoral hunting and gathering style of living. This books writes about important issues that should get more attention, especially among young men, because man usually do not talk about these issues.

Monday, August 14, 2017

Tetem and Bookshop Broekhuis

This morning, I visited TETEM art space, where I watched the videos By way of other directions by Lou Mouw and Ars Electronica Sparks Residency - Anouk Wipprecht on “Agent Unicorn” EEG wearable. At the start of the afternoon, I visited Bookshop Broekhuis. At 13:05:48, I bought the CD Passaggio: Ludovico Einaudi by Lavinia Meijer for € 9.99 and at 13:11:41, I bought a Moleskin Van Gogh Sketchbook for € 7.25 with 50% off.

Proof

With respect to the Irregular Chocolate Bar puzzle, I wrote down the following proof:

Theorem

n.m

₁

₂

₁

₂

₁

₂

Proof: Assume that S-{i₁, i₂} cannot be partitioned, while S can be partioned, than in all partitions of S i₁ and i₂ must be in different sets. There must be a partitioning P₁, P₂, .. ,P_n such that P₁ contains i₁ and P₂ contains i₂. Let {i₁, i₃, .. ,i_k} (with k>3) the set P₁, than i₃, .. ,i_k sum up to m-i₁, which by assumption is equal to i₂. It is now possible to construct a partitioning P'₁, P'₂, .. ,P_n where P'₂ equal P₂ with i₂ replaced by i₃, .. ,i_k and P'₁ equal to {i₁, i₂}. It is clear that P'₂, .. ,P_n is a partitioning of S-{i₁, i₂} such that each set sums up to m.

After some puzzling, I discovered that there is no similar theorem for each combination of i₁, i₂, and i₃ in S that sum up to m. This follows from a counter example, where S = {39, 40, 41, 98, 100, 102, 159, 160, 161} with n=3 and m=300. In this example, it does not work for 98, 100, and 102, because {39, 40, 41, 159, 160, 161} cannot be divided in two sets that sum up to 300.

Tuesday, August 15, 2017

Brain machine

This evening at TkkrLab, I put together the brain machine that I bought at SHA2017. I sat at our work bench and followed the instructions on my tablet. I did not follow the instructions to the letter. For example, I did not extend the wire to the battery holder, but soldered the wire directly on the contacts of the battery holder. I used some double sided tape to attach the battery holder to the pair of glasses. I used one of the tie wraps to attach the PCB to the pair of glasses. I did not use any glue or scotch tape. I might if I apply the decoration. Several members helped me with drilling the holes and finding things I needed. I was happy I managed to finish it in one evening and several people tried it out.

Saturday, August 19, 2017

Solution for 7 and 8

I worked on the program for the the Irregular Chocolate Bar puzzle and found (maybe all) solutions for sizes 7 and 8. The program found 56 solutions for size 7. Here are twelve of these solutions:

1 6 11 15 21 25 29 31 35 39 45 49 54 59
2 3 9 13 19 23 27 33 37 41 47 51 57 58
3 11 13 18 23 27 28 32 33 37 42 47 49 57
5 6 11 15 21 25 29 31 35 39 45 49 54 55
6 7 9 17 19 27 29 31 33 41 43 51 53 54
7 8 17 18 19 28 29 31 32 41 42 43 52 53
8 11 13 18 23 27 28 32 33 37 42 47 49 52
9 12 17 19 22 23 27 33 37 38 41 43 48 51
11 15 16 21 24 25 26 34 35 36 39 44 45 49
12 13 19 22 23 27 29 31 33 37 38 41 47 48
13 21 22 23 27 28 29 31 32 33 37 38 39 47
16 17 19 21 26 27 29 31 33 34 39 41 43 44

For size 8, only three solutions were found, which are:

2 17 25 32 37 38 47 52 53 58 67 68 73 80 88 103
11 25 26 29 31 41 44 46 59 61 64 74 76 79 80 94
17 23 25 32 37 38 47 52 53 58 67 68 73 80 82 88

Wednesday, August 23, 2017

Book

At 17:29, I bought the book A Susan Sontag Reader written by Susan Sontag in English and published by Penguin Books in 1983, ISBN:9780140054347, from thrift store Het Goed for € 1.50.

Monday, August 28, 2017

Kira Fröse

This afternoon, I bought a collage from Kira Fröse. I saw this work at the AKI finals 2017 exhibition. I met her for the first time during the opening of the AKI's serveertip, which ended yesterday.

This months interesting links

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