Sun Mon Tue Wed Thu Fri Sat
1 2 3
4 5 6 7 8 9 10
11 12 13 14 15 16 17
18 19 20 21 22 23 24
25 26 27 28 29 30 31

Received two books
I recieved the two books from Antiquariaat Kas Cornelis, for € 6.00
each:
 Kunst bij rijksgebouwen. Deel 7: (19921993) edited by Ger Dekker,
written in Dutch and English, published by Ministerie van VROM in 1993,
ISBN:9073525098,
 Kunst bij rijksgebouwen. Deel 11 (een dialoog), written by Peter
Struycken, written in Dutch, published by Ministerie van VROM in 1997,
ISBN:9789073525238.
Bookshops
I went to Amsterdam, to see the graduates exhibition at gallery Ron Mandos,
but they were closed, due to canal pride. I visited the following bookshops
in Amsterdam and Utrecht:
KABK wrapping paper
In the past week, I spend some time to analyze the wrapping paper of the
Royal Academy of Art (Koninklijke Academie van Beeldende Kunsten in
Dutch, KABK for short), which I took with me when I visited the graduation
exhibition on Sunday, July 7, 2019. The
wrapping paper is based on logo of the KABK, which consist of seven dots, four dots in a square, one
dot in the middle of the top two dots, and two dots at the cross points of
some lines between the other five dots. The seven dots can be connected with
seven lines to create the shape resembling a crown. On the wrapping paper,
there are 27 lines 18 columns of these logos, with seemingly randomly added
lines between the dots. On the seventeenth row in the eleventh column, the
logo resembling a crown can be found. I took a picture of the wrapping paper
and analyzed this with a MySample
script to extract the lines used in each of the
logos. I next went on to analyze it with a program
to see if there is any pattern in the lines added to the logos. I discovered
that the first ten columns all logos have six lines added, and that in the
remaining eight columns, all logos have seven lines added. There were no two
logos with the same lines added. Futhermore, I could not find any patterns.
It seems that the logos are purely selected and also placed at random.
The design somehow reminds me of the PARR
patterns, who were designed by Taconis Stolk, who at the moment is the head
of the ArtScience department.
Third qualifying round (continued)
Gerard, the one who raised the question about the third
qualifying round, figured out the mathematical formuleas behind the
problem. (In the following, I will use the n over k
notation for binomial coefficient n!/(k!(nk)!).)
First he derived the expressions for the numbers produced by the program I
wrote:
11520 = (10 over 0)(10 over 2)2^8
53760 = (10 over 1)( 9 over 3)2^6
50400 = (10 over 3)( 8 over 4)2^4
10080 = (10 over 4)( 7 over 5)2^2
210 = (10 over 5)( 6 over 6)2^0
Next he generalized this to the expression:
(w over s)(ws over s+wt)2^(t2s)
Where s is the number of games in which two 'League Path' teams
play against each other, t is the number of 'League Path'
teams, and w is the total number of games played, which equals
half the sum of 'Champions Path' and 'League Path' teams.
KABK wrapping paper alternative
I wonder it would be possible to arrange the logos in the KABK wrapping paper such that logos that have similar lines added are not
placed close together. I wrote a program, which
basically exchanges two at random selected logos as long as it does not make
things worse, and continues with this until there is nothing to improve
anymore. It makes use of a badness measurement that defines when the line
pattern of two logos are to similar when logos are a certain distance of each
other. Also mirrored logos in close proximation are considered bad. The
solution the program came up with can be found in this
PDF. I want to investigate if there are alternative selections of logos
that by themselves are less 'close'.
Constant weight codes
While thinking about the KABK wrapping paper, I
arrived at constant weight codes through error correction codes. The Hamming distances of two line patterns of a logo is equal to the places
where there is or is no line. Thus moving one line, equals a Hamming distance
of two. To avoid these the distance should be 4 and for logos with six and
seven lines, we should look for the value A(11,4,5) and A(11,4,4)
respectively. According to a table, these values are 66 and 35. There is a superscript s with the
66, which stands for: "shortened code (from code of length n+1 and weight w
or w+1)." I downloaded the data for A(12,4,5) and wrote a small program to
convert it into binary vectors, but I have no clue how to shorten the vectors
into something useful. It seems I have to write a program myself to generate
the vectors.
I went to see the exhibition AKI
Graduates at photo gallery Objektief with works from three female
graduates of this year, namely: Noor
Lorist, Leanne van der Wel, and Emmy Muijstege. I cannot remember having seen the works of Leanne.
Zomergo
I attended Zomergo, a rather relaxed Go retreat, for
three days and two nights. I won two out of three games. Today, I joined in
a roundtable teaching
session, where Lazy Baduk,
also called Lizzie, which uses a network based on results from Leela zero, was used to make an odd number of participants. It was also
often used to evaluate the current board. I understand that many people are
using it to review their games.
Amsterdam
I went to Amsterdam. At 13:40, I bought the following two books from
bookshop Scheltema:
 The Little Review "Ulysses", written by James Joyce, edited by
Mark Gaipa, Sean Latham, and Robert Scholes, written in English,
published by Yale University Press in 2015,
ISBN:9780300181777, for € 12.50.
 2001: A Space Odyssey written by
Arthur C. Clarke in English and (re)published by Orbit in 2018,
ISBN:9780751573756, for € 5.95
I went to gallery Ron
Mandos to see the exhibition Best of
Graduates 2019. I was a little disappointed about the choice of the works.
I did not see many that I remembered having seen at the various graduation
exhibitions that I attended. I did like the following:
Afterwards, while walking back to the train station, I also came along
Casa Luna Studio with the
exhihibition Intersections with works by Frans Horbach. On the way home, I stopped in Utrecht and visited the
bookshops Steven Sterk and Broese.
Badges
Tonight at TkkrLab, I received two badges:
the CampZone 2019 badge and the
card10 badge from the CCCamp 2019. I made some donations to the Badge Team for both of them. The second is not really a badge, but a
smart watch with a CortexM4F core.
Heatwave
Today, the heatwave, which started on August 22 (locally) and on August 23
(nation wide), has been terminated. It was the 28th national heatwave on
record. Last night there were thunderstorms and some heavy showers. Today, the
temperature reached 24.5°C. The maximum temperatures in the past days (at
the Twente Airport weather stations) were: 25.8°C (22), 26.6°C (23),
30.0°C (24), 31.1°C (25), 32.6°C (26), 33.3°C (27), and
30.9°C (28).
Retro gaming day
I helped out at the retrogaming day at TkkrLab.
This months interesting links
Home
 July 2019
 September 2019