Questionnaring study of “ira-ira” feelings

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) = ∑

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...

Obituary: Ira Herskowitz

Jasper Rine pays tribute to a distinguished career spanning several fields and a personality that was a legend among the many great teachers at UCSF.