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Amsterdam
I went to Amsterdam and visited some bookshops. First I went to
Bookshop Scheltema. I saw some interesting
books, but I did not buy any reasoning that I could better buy them tomorrow
on my way home. Next I visited Athenaeum, where I looked a round a little.
From there crossed the road the American Book Center. At 14:14, I bought the
book The Truth by Neil Strauss. Last I visited Het Martyrium. I considered buying the complete works of
James Joyce and
Being and
Nothingness by Sartre.
In the evening, I went to the opening of the exhibition Het Idioom van de Abstractie at
Art Chapel, where there are
some works by
Peter Struycken. I met with some people I knew
and got some questions of the SHA2017 badge I was wearing.
On Photography
In the morning, I finished reading the book
On Photography
by Susan Sontag,
which I started reading on June 12. I bought it on Saturday, April 2, 2016. The book presented some interesting insights, but
I also found it rather philosophical and hard to grasp. What often is lacking,
for me, is a clear structure of the argument she is trying to make. It looks
like she starts with an idea and then wanders around all kinds of corners and
end somewhere close to where she started. I got the impression that much of
what she wrote did not stick with me. Maybe I am not smart enough to comprehend
her line of thinking.
In the afternoon, Meindert and I visited
some galeries. First we brough a short visit to Torch Gallery and watched the Grayscale exhibition with works by Alain
Laboile, Louise te Poele, and
Hengki Koentjoro. Next we
went to Ron Mandos to visit the
Best of Graduates 2017. I voted for Maarten Broekhuizen
with his work The Post Topographic. I also liked (parts of) the work
Best of Breed by Valentina Gal.
After we brought a short visit to Gallery
Borzo, we went to Huis
Marseille: Museum voor Fotografie. There we saw some recent works by Juul Kraijer.
Gogbot: Day 1
Around four in the afternoon, I arrived at in the city center to help
'decorate' the TkkrLab stand on Gogbot. We were located between the info desk and the bar. I watched part
of a performance by Empress
Stah (with a laser) in the middle of the Step in the light installation by Michel Suk. When I left, I took some pictures of Museum of the moon by Luke Jerram. One of them.
Gogbot: Day 2
It was a rainly day. For most of the afternoon and the evening, I stayed at
TkkrLab stand at Gogbot. During the relatieve
quiet afternoon, I build a Creep Cluster by Reverselandfil (following the build guide) and in the evening, I joined them with their noise
performance on the stage on the square for a quarter of an hour. I looked
around in the Grote Kerk and saw: A thing and its essence by Joseph
Klibansky, Phyllotaxis
by Daan Johan and Joris Strijbos, and
works by Freek Wieringa.
At Concordia, I saw Cogito by Daniela de Paulis
and Fractal Shorts by Julius
Horsthuis. At Menistenkerk, I had my brain 'scanned' with The Brainlight by Laura Jade. I
also saw Superpower
Studio by Dominica Chen (which I already at seen at the Rietveld
Academie on July 9, 2017 ) and I looked at
a Beowulf cluster
of 37 Rasperry Pi's. At the end of the evening, there was another performance
by Empress Stah, this time before the church in a transparend sphere.
Gogbot: Day 3
Together with Andy, I visited TETEM art space,
where we walked around and saw Spectra by Matthijs Munnik.
The effect of seeing all kinds of colours in a blinking light is familiar to
me. Still interesting to see it.
Gogbot: Day 4
I went with Andy to the former Coberco milk factory to see the Gogbot
exhibition there. The most interesting was a
tapered kaleidoscope. I took several pictures inside it, one of which is shown
here above. The other exhibits that I found worth mentioning are:
Finished reading the book
The Truth: An Uncomfortable Book About Relationships by Neils Strauss,
which I started reading on September 2, the day after I bought
it. This book continues where his book The Game, which I read in
July, ended and is even more interesting and thought provoking than that book.
I very much enjoyed reading this book and it realy made me think about my own
life.
Wegzeichen
I went to the opening of the exhibition
Wegzeichen with works by Carina
Schüring organized by Kunstverein Vreden. Bernd Sikora gave an introduction. Although it was in
German, I had no problem with understanding it. Although I had seen the work
recreating familiarity last year, I
appreciated it much more than I can remember, probably because of how it is
exhibited. I also like her work embracing insecurity. It was also nice
to see the drawing Alles (Everything) again. I also bought
Carina Schüring Portfolio 2017 with a introduction by Arjan van Helmond from her for € 35.00. (One of three copies as
I found out after I bought it.)
In the evening, I went to a live performance of Heliophile for their debut CD Permeate. Before their performance,
there was a performance of Voltmeister Modular. I bought the CD and listened to it at home.
Solutions for 9
In the past month I have been thinking about an alternative algorithm to
tackle the Irregular Chocolate Bar problem,
but it has failed to materialize. This week, I decided to see if I could
improve on the existing algorithm to get at least some solutions. It is always
nice if you can limited you search space by an upper limit. I started
the program yesterday afternoon and by
the end of this evening, it already found over fifty thousand solutions with 20
integers. This makes me wonder if there is a solution with 19 integers. These
solutions are found by constructing a 'chains' solution for 18 integers and
then twice split an integer into two. The improvement on the algorithm is that
it first performs some check on the solutions for 18 integers with an
alternative knapsack algoritm to see if it possibly could contain a solution with
some additional splitting, before trying all possible splits and testing them
against the existing algoritm. The first solution found by the program is:
9 set: 1 6 29 41 45 60 80 81 95 115 130 150 154 165 185 200 210 220 274 279
5 buckets with 504: 95+130+279 80+150+274 29+45+210+220 1+6+41+60+81+115+200 154+165+185
6 buckets with 420: 60+81+279 6+45+95+274 200+220 80+130+210 29+41+165+185 1+115+150+154
7 buckets with 360: 81+279 6+80+274 45+95+220 150+210 1+29+130+200 60+115+185 41+154+165
8 buckets with 315: 1+6+29+279 41+274 95+220 45+60+210 115+200 130+185 150+165 80+81+154
9 buckets with 280: 1+279 6+274 60+220 29+41+210 80+200 95+185 115+165 45+81+154 130+150
Chestnuts
It is clear that the fall has started. I saw some very large mushrooms along
the road. At 10:21, I picked up six big chestnuts
from a tree on the Hengelosestraat near number 569. There were many more on the
ground.
A friend of mine wanted to have a brain machine like the one offered by Ada Fruit, but when it turned out that the
international shipping costs were rather high, I decided to build one myself
from parts. I started with the design by Chris Sparnicht and took some ideas from the brain machine
from Ada Fruit with respect to the schematics of the headphone. I also decided
to use a single potmeter to control the volume by putting it between the
'ground' of the earphones and the ground. I am aware that this could cause
some crosstalk when the volume is reduced, but I hope it is not going to be a
big problem. While at TkkrLab, I arrived at
the principal schema as displayed on the right and made a shopping list of
parts. I bought a cheap Arduino Nano clone from the stock at TkkrLab.
105869 solutions
The program for the Irregular Chocolate Bar problem for up to and including 9 equal
divisions has found 105869 solutions with 20 integers starting with three
'chains' and two additional cuts. A 'chain' is a sequence of integers, where
each pair of consecutive interers add up to alternating 280 and 315. It is now
working on starting with a 'necklage' and
three additional cuts, but has not found any solutions yet. It would not
surprise me, if it does not find any aditional solutions. I checked if any of
the solutions could be divided into 10 equal divisions, but this was not the
case. Below the 'smallest' solution is given, with respect to the integers
being used.
9 set: 31 60 80 85 95 99 109 111 115 120 121 124 150 156 159 160 165 185 195 200
5 buckets with 504: 109+195+200 159+160+185 95+120+124+165 31+85+111+121+156 60+80+99+115+150
6 buckets with 420: 99+121+200 60+165+195 115+120+185 80+85+95+160 111+150+159 31+109+124+156
7 buckets with 360: 160+200 165+195 60+115+185 80+121+159 95+109+156 99+111+150 31+85+120+124
8 buckets with 315: 115+200 120+195 31+99+185 150+165 60+95+160 156+159 80+111+124 85+109+121
9 buckets with 280: 80+200 85+195 95+185 115+165 120+160 121+159 124+156 31+99+150 60+109+111
885 solutions for 10 with 22 integers
While one program is still working on finding solutions for the the Irregular Chocolate Bar problem for up to and including 9 equal
divisions, I decided to also start a run for up to and including 10. To my
surprise it found 885 solutions with 22 integers. It is possible that there are
solutions with 21 integers. The 'smallest' of the 885 solutions, with respect
to the integers used, is:
17 45 52 53 80 81 95 96 105 108 109 111 115 116 136 137 143 144 171 172
Brain machine
Last week, I bought the following parts from STORES for the brain machine:
- 10K potmeter with nob
- 2m 3.5 jack extention cord
- Two 3.5 female jacks
- Three 220Ω resistors
- Two 3.3KΩ resistors
- Two 1µF elco condenstators
- Two red 5mm LEDs
- Small box including PCB
This afternoon, I spend about four hours working at TkkrLab at assembling the brain machine. I spend some time removing some
material from the PCB of the Arduino Nano near the USB connector with a file,
to make it fit in the box. Next I spend some time putting the components on the
PCB. I also attached some wires (not all) that will connect to the jacks, the
potmeter and the reset button on the top part of the box. Below a picture of
the PCB in the box, where I added some red lines to indicate how the components
are connected on the back, and a picture of the back of the PCB.
This months interesting links
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Thursday, September 7, 2017
Sunday, September 10, 2017
Brain machine