The Chaff

Separating the chaff from the grain (Tularemia).

A case of ulcero-glandular tularemia is presented. Discussion is based on the differential diagnosis of a patient presenting with cutaneous lesions, regional lymphadenopathy and fever.

Enhanced: Separating the Wheat from the Chaff

Seeing the world around you is like drinking from a firehose. The flood of information that enters the eyes could easily overwhelm the capacity of the visual system. To solve this problem, a mechanism-attention-allows selective processing of the information relevant to current goals. As the eminent physiological psychologist Helmholtz [HN2], [HN3], [HN4] noted over a hundred years ago, even wit...

From Backtracking to Chaff

Modern Chaff-like SAT solvers enhance plain backtracking (DLL) by Conflict-Driven Learning (CDL), including 1UIP-based Conflict-Directed Backjumping (CDB), Non-Chronological Backtracking (NCB), and 1UIP-based Conflict-Clause Recording (CCR). We show how to add these enhancements step-by-step to plain DLL to derive Chaff’s Conflict-Driven Learning algorithm, separately and independently of BCP, ...

Winnowing Wheat from Chaff: The Chunking GA

In this work, we investigate the ability of a Chunking GA (ChGA) to reduce the size of variable length chromosomes and control bloat. The ChGA consists of a standard genetic algorithm augmented by a communal building block memory system and associated memory chromosomes and operators. A new mxn MaxSum fitness function used for this work is also described. Results show that a ChGA equipped with ...

To separate wheat and chaff.