A new poetics of exile and belonging: the place of memory in the new media environment

This paper explores how new media environments represent and create collective memories of trauma; how creative digital practice can be a key methodology for memory studies and the potential of digital interfaces for representing and reconciling collective memories of trauma, particularly in the context of Cyprus. My project MemoryBank will be used as a model to discuss the potential role of creative digital media practice in both community arts and the formal education process in order to enable participants to engage with the process of peace and reconciliation in Cyprus and circumvent and negotiate politically ossified collective memory narratives and chauvinistic histories. [From the Author]

Parallel implementation of the recurrence method for computing the power-spectral density of thin avalanche photodiodes

A simulation program has been developed to calculate the power-spectral density of thin avalanche photodiodes, which are used in optical networks. The program extends the time-domain analysis of the dead-space multiplication model to compute the autocorrelation function of the APD impulse response. However, the computation requires a large amount of memory space and is very time consuming. We describe our experiences in parallelizing the code using both MPI and OpenMP. Several array partitioning schemes and scheduling policies are implemented and tested Our results show that the OpenMP code is scalable up to 64 processors on an SGI Origin 2000 machine and has small average errors.

On information rates of time-varying fading channels modeled as finite-state Markov channels

We study information rates of time-varying flat-fading channels (FFC) modeled as finite-state Markov channels (FSMC). FSMCs have two main applications for FFCs: modeling channel error bursts and decoding at the receiver. Our main finding in the first application is that receiver observation noise can more adversely affect higher-order FSMCs than lower-order FSMCs, resulting in lower capacities. This is despite the fact that the underlying higher-order FFC and its corresponding FSMC are more predictable. Numerical analysis shows that at low to medium SNR conditions (SNR lsim 12 dB) and at medium to fast normalized fading rates (0.01 lsim fDT lsim 0.10), FSMC information rates are non-increasing functions of memory order. We conclude that BERs obtained by low-order FSMC modeling can provide optimistic results. To explain the capacity behavior, we present a methodology that enables analytical comparison of FSMC capacities with different memory orders. We establish sufficient conditions that predict higher/lower capacity of a reduced-order FSMC, compared to its original high-order FSMC counterpart. Finally, we investigate the achievable information rates in FSMC-based receivers for FFCs. We observe that high-order FSMC modeling at the receiver side results in a negligible information rate increase for normalized fading rates fDT lsim 0.01.

Parallel bandwidth characteristics calculations for thin avalanche photodiodes on a SGI Origin 2000 supercomputer

An important factor for high-speed optical communication is the availability of ultrafast and low-noise photodetectors. Among the semiconductor photodetectors that are commonly used in today’s long-haul and metro-area fiber-optic systems, avalanche photodiodes (APDs) are often preferred over p-i-n photodiodes due to their internal gain, which significantly improves the receiver sensitivity and alleviates the need for optical pre-amplification. Unfortunately, the random nature of the very process of carrier impact ionization, which generates the gain, is inherently noisy and results in fluctuations not only in the gain but also in the time response. Recently, a theory characterizing the autocorrelation function of APDs has been developed by us which incorporates the dead-space effect, an effect that is very significant in thin, high-performance APDs. The research extends the time-domain analysis of the dead-space multiplication model to compute the autocorrelation function of the APD impulse response. However, the computation requires a large amount of memory space and is very time consuming. In this research, we describe our experiences in parallelizing the code in MPI and OpenMP using CAPTools. Several array partitioning schemes and scheduling policies are implemented and tested. Our results show that the code is scalable up to 64 processors on a SGI Origin 2000 machine and has small average errors.

Venus infers

These poems mark the fault lines of myth, dream and memory, of a doubled identity emerging from the clash of war, desire and the cacophony of the city. 1974/Dead Sister , a narrative poem with a cast that includes Lewis Carroll’s Alice, Freud’s Dora, the Lady of Shalott, Ophelia, Esther, female cowboys and other deposed goddesses is ‘an autobiography’ of an imaginary dead twin. Alev Adil delineates the traces of a sense of displacement, but while the poems mark those frenetic uncertainties and erasures they celebrate the plenitude of new stories, epistemologies and possibilities born out of falling into fracture (the fracture of memory, gender, identity, culture) more than they mourn any loss. Venus Infers is haunted by the deities of ancient Greek myths and their contemporary manifestations. Eurydice is hiding out in Hackney, sometimes glimpsed on the Jubilee Line; Ariadne remembers her ancient palace as she prowls the endless corridors of a London hotel; Penelope still waits for peace in the ruins of Marash/Varosha. Cyprus often features in these poems, both as a landscape for myth and as a site for contemporary, and contested, memories. [From the Author]