Complex systems such as Cellular Automata (CA) produce global behaviour based on the interactions of simple units (cells). Their evolution is specified by local interaction rules that generate some form of ordered, complex or chaotic behaviour patterns. This wide variety of behaviour represents an important generative tool for the artist. Chaotic behaviour dominates rule space, which has serious implications for the serendipitous use of these systems in artistic endeavour. CA are fascinating objects, producing more pattern than a single human is capable of observing within their own lifetime. Obtaining a variety of pattern for free is thus a challenge to the artist and scientist alike. A fresh insight into measuring behaviour and sampling rule space is presented based on empirical evidence. Insights gained from earlier generative music experiments suggest Ashby's cybernetic quantity of variety as a new way of measuring behaviour. A simple and effective method for creating groups of rules with a broad range of behaviour is demonstrated. Isomorphism between automata and music composition technology is shown to exist in terms of basic modular components. This connection provides a fundamental link between the fields and a familiar point of reference for both artist and scientist.
Wireless networks based on the WiMedia specifications provide a good way to build low cost and robust networks with considerably high data rates. This work investigates the limits of these networks, especially in terms of scalability and time behavior. With a WiMedia MAC (media access control) protocol simulator we analyzed scenarios with up to 80 simultaneous nodes per channel and identify situations where the efficiency of the protocol degrades. The simulations are followed by an investigation of the situations and we present ideas to modify the protocol to increase the performance in environments with dense nodes deployment.
Wireless connected devices become increasingly popular in a large variety of applications. Consumer electronics most certainly is the field with the most wireless innovations in the past years; but also other areas, such as medical equipment, vehicular on-board networks or maintenance services, experience an increasing demand for wireless communication. Additionally the networks should just work and require as little maintenance as possible. Hence future WLAN and WPAN must be self-configuring, self-healing and distributed to provide flexible usage. Assuming a homogeneous distributed MAC protocol with a beacon based reservation mechanism, a radio resource reservation algorithm is developed to fulfil the delay and data rate requirements from the devices. It uses a game theoretic approach to achieve infrastructure-less design and still provides fair resource allocation. Changes in the radio channel, failing devices or links and mobile nodes are detected and a reorganisation of resources is calculated.
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