It was proposed that perfect invisibility cloaks can be constructed for hiding objects from electromagnetic
illumination (Pendry et al., Science 312, p. 1780). The cylindrical cloaks experimentally
demonstrated (Schurig et al., Science 314, p. 997) and theoretically proposed (Cai et al., Nat. Photon.
1, p. 224) have however simplified material parameters in order to facilitate easier realization
as well as to avoid infinities in optical constants. Here we show that the cylindrical cloaks with
simplified material parameters inherently allow the zeroth-order cylindrical wave to pass through
the cloak as if the cloak is made of a homogeneous isotropic medium, and thus visible. To all
high-order cylindrical waves, our numerical simulation suggests that the simplified cloak inherits
some properties of the ideal cloak, but finite scatterings exist.
nTIM PATRICK has been working professionally as a software architect and developer for nearly
25 years. By day he develops custom business applications in Visual Basic for small to medium-
sized organizations. He is a Microsoft Certified Solution Developer (MCSD). In April 2007,
Microsoft awarded Tim with its Most Valuable Professional (MVP) award for his work in sup-
porting and promoting Visual Basic and its community of users. Tim received his under-
graduate degree in computer Science from Seattle Pacific University. You can contact him
through his web site, www.timaki.com.
This book has been written to support a practically oriented course in programming language
translation for senior undergraduates in Computer Science. More specifically, it is aimed at students
who are probably quite competent in the art of imperative programming (for example, in C++,
Pascal, or Modula-2), but whose mathematics may be a little weak students who require only a
solid introduction to the subject, so as to provide them with insight into areas of language design
and implementation, rather than a deluge of theory which they will probably never use again
students who will enjoy fairly extensive case studies of translators for the sorts of languages with
which they are most familiar students who need to be made aware of compiler writing tools, and to
come to appreciate and know how to use them. It will hopefully also appeal to a certain class of
hobbyist who wishes to know more about how translators work.
MD5的全稱是Message-digest Algorithm 5（信息-摘要算法），在90年代初由MIT Laboratory for Computer Science和RSA Data Security Inc,的Ronald.L.Rivest開發(fā)出來，經(jīng)MD2、MD3和MD4發(fā)展而來。
wxPython In Action，By combining introductions, overviews, and how-to examples, the In Action
books are designed to help learning and remembering. According to research in
cognitive Science, the things people remember are things they discover during
self-motivated exploration.
ADIAL Basis Function (RBF) networks were introduced
into the neural network literature by Broomhead and
Lowe [1], which are motivated by observation on the local
response in biologic neurons. Due to their better
approximation capabilities, simpler network structures and
faster learning algorithms, RBF networks have been widely applied in many Science and engineering fields. RBF network is three layers feedback network, where each hidden unit implements a radial activation function and each output unit implements a weighted sum of hidden units’ outputs.
Embedded System Design:
A Unified Hardware/Software Approach
Frank Vahid and Tony Givargis
Department of Computer Science and Engineering
University of California
