Sciweavers

CIS
2009
Springer
14 years 7 months ago
On the Role of Interpolation in the Normalization of Non-ideal Visible Wavelength Iris Images
Abstract—The growth in practical applications for iris biometrics has been accompanied by relevant developments in the underlying algorithms and techniques. Along with the resear...
Gil Melfe Mateus Santos, Hugo Pedro Martins Carric...
CIE
2009
Springer
14 years 7 months ago
Stochastic Programs and Hybrid Automata for (Biological) Modeling
We present a technique to associate to stochastic programs written in stochastic Concurrent Constraint Programming a semantics in terms of a lattice of hybrid automata. The aim of ...
Luca Bortolussi, Alberto Policriti
CIE
2009
Springer
14 years 7 months ago
Complexity of Existential Positive First-Order Logic
Let Γ be a (not necessarily finite) structure with a finite relational signature. We prove that deciding whether a given existential positive sentence holds in Γ is in LOGSPACE...
Manuel Bodirsky, Miki Hermann, Florian Richoux
CIE
2009
Springer
14 years 7 months ago
Computable Exchangeable Sequences Have Computable de Finetti Measures
Abstract. We prove a uniformly computable version of de Finetti’s theorem on exchangeable sequences of real random variables. In the process, we develop machinery for computably ...
Cameron E. Freer, Daniel M. Roy
CIE
2009
Springer
14 years 7 months ago
Relationship between Kanamori-McAloon Principle and Paris-Harrington Theorem
We give a combinatorial proof of a tight relationship between the Kanamori-McAloon principle and the Paris-Harrington theorem with a number-theoretic parameter function. We show th...
Gyesik Lee
CIE
2009
Springer
14 years 7 months ago
Cutting Planes and the Parameter Cutwidth
We introduce the parameter cutwidth for the Cutting Planes (CP) system of Gomory and Chv´atal. We provide linear lower bounds on cutwidth for two simple polytopes. Considering CP ...
Stefan S. Dantchev, Barnaby Martin
CIE
2009
Springer
14 years 7 months ago
Lowness for Demuth Randomness
We show that every real low for Demuth randomness is of hyperimmune-free degree.
Rod Downey, Keng Meng Ng
CIE
2009
Springer
14 years 7 months ago
Program Self-reference in Constructive Scott Subdomains
Abstract. Intuitively, a recursion theorem asserts the existence of selfreferential programs. Two well-known recursion theorems are Kleene’s Recursion Theorem (krt) and Rogers’...
John Case, Samuel E. Moelius
CIE
2009
Springer
14 years 7 months ago
Decidability of Sub-theories of Polynomials over a Finite Field
Abstract. Let Fq be a finite field with q elements. We produce an (effective) elimination of quantifiers for the structure of the set of polynomials, Fq[t], of one variable, in...
Alla Sirokofskich
CIE
2009
Springer
14 years 7 months ago
Ordinal Computability
computability uses ordinals instead of natural numbers in abstract machines like register or Turing machines. We give an overview of the computational strengths of α-β-machines,...
Peter Koepke