IRA Travelling Fellowship–ALPAR 2010

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) = ∑

Individual retirement account balances, contributions, and rollovers, 2010: the EBRI IRA database.

In 2010, IRA owners were more likely to be male, especially those whose accounts originated from a rollover or were a SEP/SIMPLE. Among all IRA owners in the database, nearly one-half (45.8 percent) were ages 45-64. The average and median IRA account balance in 2010 was $67,438 and $17,863, respectively, while the average and median IRA individual balance (all accounts from the same person comb...

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...