John Dilworth Western Michigan University The outlines of a novel, fully naturalistic theory of perception are provided, that can explain perception of an object X by organism Z in terms of reflexive causality. On the reflexive view proposed, organism Z perceives object or property X just in case X causes Z to acquire causal dispositions reflexively directed back upon X itself. This broadly fun...

The development of critical systems often places undue trust in the software tools used. This is especially true of compilers, which are a weak link between the source code produced and the object code which is executed. Stepney [23] advocates a method for the production of trusted compilers (i.e. those which are guaranteed to produce object code that is a correct renement of the source code) ...

The main objective of this tutorial is to introduce basic requirements and concepts of balancing piston/connecting-rod/crankshaft assembly in an engine. In order to be able to portray a coherent picture we need to introduce some simple tools used in statics and dynamics of objects. The approach taken here is combination of algebraic and geometric presentation to maximize physical understanding....

where x = (x0, x1, x2), y = (y0, y1, y2) with xi, yi ∈ H (X,Z). For an object E ∈ D(X), we define the Mukai vector v(E) ∈ H(X,Z) of E as the Chern character of E. We also call an element v ∈ H(X,Z) Mukai vector, if v = v(E) for an object E ∈ D(X). We denote the coarse moduli space of S-equivalence classes of semi-stable sheaves E with v(E) = v by MH(v) and the open subscheme consisting of stabl...

Deep Chandra X-ray exposures provide an efficient route for locating optically faint active galactic nuclei (AGN) at high redshifts. We use deep multicolor optical data to search for z > 5 AGN in the 2 Ms X-ray exposure of the Chandra Deep Field-North. Of the 423 X-ray sources bright enough (z < 25.2) for a color-color analysis, at most one lies at z = 5 − 6 and none at z > 6. The z > 5 object ...

This is an account of three 1-hour lectures given at the Instructional Conference on Representation Theory of Algebraic Groups and Related Finite Groups, Isaac Newton Institute, Cambridge, 6–11 January 1997. In section 1, we define abelian categories following Grothendieck [12]. We then characterize module categories among abelian categories. Finally we sketch a proof of Mitchell’s full embeddi...

We describe the SLam calculus, a typed-calculus that maintains security information as well as type information. The calculus maintains four diierent forms of security information: which agents could have created an object, which agents may read an object, and which agents may indirectly, through nondeterminism or the actions of other agents, may create or read objects. We prove that the type s...

A method of analyzli-rg 30 range images Zix.y:I 1s described and ~llustrated. Prlor knowledge of object models and scenP content is not used. The strategy uses a mlxture of analytlc and image processing techniques. A pixel or surf ace element ("surfel "1) in Z!x.y:) has eight degrees of freedom, of which Z, x, and y are given, and the remaining five are computed. The surfels are classified and ...

This paper presents and evaluates a fast graphics hardwarebased voxelization method to spatial analysis, which generates object-coded volume data utilizing the Performer scene-graph. Two color-coding algorithms are introduced. The first one resolves one object per voxel for a large number of objects. The second algorithm extends the first to identify multiple objects in one voxel, by using blen...

This paper presents an approach to synthesizing functional and robust code from object oriented design models and Z data and operation speci cations The approach used here is based on an integrated notation of the Uni ed Modeling Language and a slightly ex tended Z notation to include object oriented concepts and structures Our approach generates fully functional code which can be compiled and ...