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EXPERIMENTAL VIRTUAL WAYANG (excerpt from the virtual part) (Balinese Shadow Puppet + Virtual Interactive Puppet + Live Drawing and Storytelling)
Grace Street (More) (Balinese Shadow Puppet + Virtual Interactive Puppet + Live Drawing and Storytelling)
Grace Street Theater , November 8 2007, Thursday 7 pm - Richmond VA USA
Puppeteer: I Gusti Putu Sudarta
Virtual Puppets and Interactive System: Semi Ryu and Stefano Faralli
Music: Andrew McGraw
Background flame : Christopher Romero
"Experimental Virtual Wayang" is a contemporary translation of the traditional Balinese (Indonesia) shadow puppet performance ("wayang kulit"), featuring virtual interactive puppets and a realtime background drawing system, bringing the sprit of live improvisation into storytelling.
This project explores two ideas of shadow; traditional shadows casted by wayang puppets, and digital shadows, projected images of virtual puppets projected one same screen. The shadow master will be able to simultaneously manipulate traditional puppets as well as virtual puppets which have been fitted with infrared units which will be monitored by a motion and position detection system. This system then communicates with a three-dimensional computer graphics system which will project virtual puppets onto the same screen used to display the traditional wayang puppets. He will be able to change the look of the virtual puppet and to control its movements based upon his own voice. This project opens the interactive system to public, inviting people to draw background images, interacting with puppeteer and musician, during the performance.
I Gusti Putu Sudarta is a renowned musician, composer, dancer and shadow master from the village of Bedulu in Bali, Indonesia. He is a permanent faculty member in the theater department at the Indonesian Institute of the Arts in Denpasar, Bali. Mr. Sudarta has been studying the Balinese perfoming arts since the age of six and participates in weekly ceremonial and secular performances. Since the mid 1980s he has participated in yearly international tours of Balinese traditional and experimental music and dance. He has taken part in numerous inter-cultural experimental theater and music collaborations including the Theft of Sita project in collaboration with the Australian composer Paul Grabowksy and theater director Nigel Jameson.
Semi Ryu is assistant professor of Kinetic Imaging at Virginia Commonwealth University. Ryu is a Korean-born multimedia artist who specializes in experimental storytelling approaches and virtual puppetry. Her works have been displayed in exhibitions internationally, and her academic papers, which have focused on the ritualization of interactive media have been published in numerous journals.
http://www.semiryu.com
Stefano Faralli is assistant researcher at Department of Informatica at University of Rome "La Sapienza" Italy. Faralli develops interactive systems for performance and installations which involve body posture/motion detection and multimedia production (real-time computer graphics and sound synthesis).
http://hci.uniroma1.it/multimedialab/
Andrew Clay McGraw is an assistant professor of music and ethnomusicology at the University of Richmond. He has studied traditional and experimental music in Bali and Java during several years of residence in Indonesia. He has collaborated with several leading Indonesian composers and ensembles including I Wayan Sadra, I Made Subandi, I Wayan Yudane and the Cudamani ensemble.
John Macdonald has been studying and performing Balinese and Javanese gamelan since the 1980s. He is a student of I Nyoman Suadin.
Taylor Burton, Deven Langston : Background (Live sand drawing) (Less)
Energy Recovery Snubbers with Rudy Severns Energy Recovery Snubbers. Part of a series of videos on the design of snubber circuits for power (More) Energy Recovery Snubbers. Part of a series of videos on the design of snubber circuits for power electronics by Rudy Severns. Hello. I'm Rudy Severns, and welcome to my office. I'm writing a book on the design of snubber circuits for power electronics. In fact, the book's title will be Snubber Circuits for Power Electronics.
What I'd like to do now is to share with you the contents of one of the chapter so that you get a really good feel for what this book is all about. The book will have a number of chapters on different types of snubbers, on switching, on general advice of component selection.
One of the chapters, which I have a copy of the draft in front of me here, will be on energy recovery type snubbers. Because while the normal dissipated type snubbers are the most commonly used, as soon as the power levels start to go very high particularly in power conversion units above about a kilowatt or so, an awful lot of power can be dissipated in the dissipated resistors for the snubbers.
That power becomes quite significant as the power level goes up. For reasons of both efficiency and thermal management you're going to want, on many occasions, to use a snubber circuit which recovers the energy rather than dissipates it.
By recover it usually means that the energy that would have been dissipated is either delivered to an output load of some kind, or it is back to the input source. In other words, it's put to some useful purpose.
This particular chapter we're talking about here on energy recovery snubbers, goes through and talks about a number of different things, but particularly it also talks in general principles. For example, there are many, many papers that have been written on energy recovery snubbers. Most of them, almost all of them, don't mention the practical problems with energy recovery snubbers in that an energy recovery snubber in its purest form, will have no damping in it because you're trying to have as high efficiency as possible.
Unfortunately what happens is, without any damping you have noise and ringing so that the circuit doesn't behave as you think. One of the things that this chapter is intended to bring out clearly is that you still have to have some dissipated damping in the circuit. What it is, is a balancing act between efficiency and saving as much power as possible, and on the other end, having waveforms which are acceptable from a noise and ringing point of view.
The chapter goes through, for example, start off with an example, turn-off snubbers; energy recovery turn-off snubbers. Then it will go on to energy recovery turn-on snubbers. These are circuits which are working, in one case, at recovering the energy in the snubbing at the end of the switching cycle, and the others at the beginning of the switching cycle.
Then, of course, what is very popular is to try to recover all of the energy and to have snubbing at both the turn-on and the turn-off. This section of the chapter will deal with several examples of energy recovery snubbers which are intended to work at both ends; we call them combination snubbers. It turns out that some of them are fairly simple and some of them are very complex.
The final section of energy recovery snubbers will deal with bridge circuits, or we should say these half-bridge totem poles which can be half-bridge, full bridge, poly-phase, these types of snubbers. These form another class of energy recovery snubbers.
In fact, energy recovery snubbers themselves can be divided into those that use the switch as the energy recovery mechanism, the switch being protected, or those which use an auxiliary switch.
All of this information will be presented in this chapter to give a really good overview of what energy recovery snubbers are all about, and more importantly, practical. What can you expect from an energy recovery snubber? Just how good could it be?
In theory it can be 100%, but in practice maybe 75%-80% of the power loss can be recovered and then you're about there. It actually turns out that the real driver is controlling the circuit waveforms and getting rid of the ringing. The damping, in other words, that's required to be used in there. (Less)
papers Motor unit discharge 
2009-08-13 - extension: pdf - size: 752 KB
papers Motor unit discharge
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backups-PH2009-sUN 
2009-12-17 - extension: rar - parts: 4 - size: 100 MB
backups-PH2009-sUN
Hosted on: megaupload.com
backups-PH2009-sUN 2009-12-17 - extension: rar - parts: 4 - size: 100 MB
backups-PH2009-sUN
Hosted on: rapidshare.com
