Archive for the ‘process’ Category

Joining the queue

Monday, October 5th, 2009

Queue 1

Queues are comprised of customers joining, waiting and then being served. There are two random processes here: arrivals, and serving time, which in this case are both Poisson processes. There can be one or more servers. A handy notation for this is: M/M/n, where the first M describes customer arrival, the second M server processing time, and the n the number of servers.

In this applet, there are 150 queues, each one M/M/5, with a customer arrival rate \lambda of 20 per second, and a server rate \epsilon of 3 per second.

As each customer gets served, their dot turns red, and all the customers shuffle up one. When serving is finished, the dot disappears. As the server has become free, the next customer is served.

This first attempt demonstrates the variation that can occur. Currently, the queues move to the right if serving outpaces arrival. The next step is to have them wait at a particular point, and then moving off when a server is free, with those behind moving up to fill the space.

More queue models to follow, though not sure what their arrival rate will be…

Geological

Saturday, February 7th, 2009

There are small, persistent landslides from these cliffs every few minutes. Sometimes they can’t be seen, but you can hear the hissing noise. This is the result.

The beach has many blocks of stone containing fossillised shells. Lots of these stones have live barnacles and limpets firmly attached. It’s hard to tell what they think of their ancestors, but not that much seems to have changed over time.

Cildo Meireles

Sunday, November 2nd, 2008

Thursday 31st September – Cildo Meireles at the Tate Modern.  Brazilian conceptual artist.

Information

Meireles spread ideas, statements and the art itself through use of existing mechanisms, such as banknotes, recycled coke bottles and the classified pages of newspapers. The choice of the system itself carries meaning (”Yankees go home!” on the bottles). The world around becomes the space for the art to work in.Babel (2001) is a tower of radios. Each one is a different model, tuned to different frequencies. Instead of being an overwhelming wall of noise, the many fuse into a single experience – you have to lean close to hear individual voices. It exposes a broad range of the electromagnetic radio spectrum, to be heard as a single thing.In Eureka/Blindhotland (1970-5) there are many spheres, which you are encouraged to pick up. Each is a different weight, from 500 grams to 1500 grams, but all are visually identical.Glovetrotter (1991) is also composed of spheres, but this time each is a different type. A steel mesh has been draped over all, concealing their identity, but not the scale.

Measuring space

The first room is full of precise works on graph paper, where repeated, systematically joined points create clearly defined volumes. This moves on to proposals/instructions for conceptual works, also drawn on graph paper, many of which concern different forms of measurement. For example, a work is proposed where Meireles will canoe around the North Pole, becoming a day younger on each circumnavigation. Maps feature heavily, fundamentally being the lines which delineate borders between countries.Fontes (1992/2008) is a brightly lit room full of tape measures hung from the ceiling, creating a forest in which visitors can lose themselves. There are spiral paths through the measures, which can be walked through – but becoming progressively narrower towards the middle of the room, and then imperceptible. Having followed the spiral, you are disorientated, and wanting to leave, it is very difficult to tell if you are pushing through the tapes in a straight line. When out, you are confronted with walls packed with clocks – each of which has a non-uniform distribution of time, with the 12,3,6 and 9 placed at varying points around the dial.

Reality through RjDj

Sunday, October 12th, 2008

rjdj.jpg

I installed RjDj on my iphone yesterday. It takes sound from the environment you’re in, using the samples both as the ingredients of a musical composition, and to influence it.

Some notes:

  • It’s not long before you’re singing along to yourself. This can’t be much fun for anyone listening (I remember when walkmen were fairly new, and my sister singing along in the car without being able to hear herself)
  • Walking past railings is a useful way of generating rhythmic noise
  • Walking around, previously intrusive noises such as car hoots, children wailing and people shouting become welcome material.
  • This causes a new detachment from reality – it becomes much easier to hear it all in a state of detachment, as a rich tapestry
  • I wonder how long it will be before this, or other reality-altering devices, end up with people shaping the reality around them in order to make a more interesting experience. We will end in a narrative that would suit The Dice Man
  • You’re recommended to listen with headphones, presumably to prevent unpleasant feedback loops. But it adds a whole new element to driving if plugged into the stereo. Years ago (early 90’s) I imagined a musical device that would take the motions and actions of driving as the trigger. RjDj seems to do the job.
  • It brings a whole new dimension to watching X-Factor
  • The newfound ability to listen to environmental sounds in an unjudgemental manner continues, at least for a while, into Genuine Unamended Reality