Counterterrorism Killings and Provisional IRA Bombings, 1970–1998

Ira Gerhardt

SYMMETRIC INCLUSION - EXCLUSION Ira

One form of the inclusion-exclusion principle asserts that if A and B are functions of finite sets then the formulas A(S) = ∑ T⊆S B(T ) and B(S) = ∑ T⊆S(−1) |A(T ) are equivalent. If we replace B(S) by (−1)|S|B(S) then these formulas take on the symmetric form A(S) = ∑

Terrorist bombings in Madrid

The report by Peral Guiterrez de Ceballos and colleagues [1] is a timely, well written, and informative contribution to our growing body of knowledge of disaster medicine, as well as an appalling confirmation of the horrors of the senseless and vicious scourge of terrorism that now afflicts the world. Their comprehensive analysis of the results of medical management of 312 survivors triaged to ...

Ira Herskowitz (1946–2003)

breadth and the intensity of Ira's interests. It also revealed Photo courtesy of Kay Chernush. his modus operandi: using simple genetics to ask and answer big questions. transduction by studying crosstalk between pathways, In 1971, in his last year of graduate school, Ira accepted and examined sporulation as a developmental program. an Assistant Professorship in the University of Oregon's Recen...

Serially Concatenated IRA Codes

We address the error floor problem of low-density parity check (LDPC) codes on the binary-input additive white Gaussian noise (AWGN) channel, by constructing a serially concatenated code consisting of two systematic irregular repeataccumulate (IRA) component codes connected by an interleaver. The interleaver is designed to prevent stopping-set error events in one of the IRA codes from propagati...