Efficient two-step digit-set-restricted modified signed-digit algorithm based on optoelectronic shared content-addressable memory

A two-step digit-set-restricted modified signed-digit (MSD) adder based on symbolic substitution is presented. In the proposed addition algorithm, carry propagation is avoided by using reference digits to restrict the intermediate MSD carry and sum digits into {(1) over bar ,0} and {0, 1}, respectively. The algorithm requires only 12 minterms to generate the final results, and no complementarity operations for nonzero outputs are involved, which simplifies the system complexity significantly. An optoelectronic shared content-addressable memory based on an incoherent correlator is used for experimental demonstration. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

Efficient two-step digit-set-restricted modified signed-digit algorithm based on optoelectronic shared content-addressable memory

A two-step digit-set-restricted modified signed-digit (MSD) adder based on symbolic substitution is presented. In the proposed addition algorithm, carry propagation is avoided by using reference digits to restrict the intermediate MSD carry and sum digits into {(1) over bar ,0} and {0, 1}, respectively. The algorithm requires only 12 minterms to generate the final results, and no complementarity operations for nonzero outputs are involved, which simplifies the system complexity significantly. An optoelectronic shared content-addressable memory based on an incoherent correlator is used for experimental demonstration. (c) 2005 Society of Photo-Optical Instrumentation Engineers.

A novel brain partition highlights the modular skeleton shared by structure and function

Elucidating the intricate relationship between brain structure and function, both in healthy and pathological conditions, is a key challenge for modern neuroscience. Recent progress in neuroimaging has helped advance our understanding of this important issue, with diffusion images providing information about structural connectivity (SC) and functional magnetic resonance imaging shedding light on resting state functional connectivity (rsFC). Here, we adopt a systems approach, relying on modular hierarchical clustering, to study together SC and rsFC datasets gathered independently from healthy human subjects. Our novel approach allows us to find a common skeleton shared by structure and function from which a new, optimal, brain partition can be extracted. We describe the emerging common structure-function modules (SFMs) in detail and compare them with commonly employed anatomical or functional parcellations. Our results underline the strong correspondence between brain structure and resting-state dynamics as well as the emerging coherent organization of the human brain.

Sistemas de contabilidad de gestión y desempeño de joint ventures internacionales: rol positivo de la experiencia de los directivos

[ES] Este trabajo explora el rol de los sistemas de la contabilidad de gestión en el desempeño de Joint Ventures (JV) del tipo 50/50 en la industria autopartista. Se investiga el impacto que la experiencia previa de los directivos tiene sobre la intensidad y propósito de uso de los sistemas de la contabilidad de gestión y como ellos afectan el desempeño de JVs. El estudio de este fenómeno surge a partir de los resultados reportados en tres estudios de campo exploratorios en JVs (Groot y Merchant 2000) y de otros tres casos de JVs internacionales en la industria autopartista (Porporato 2013) en donde se sugieren que el efecto de los sistemas de control de gestión en el desempeño organizacional es secundario. Los resultados aquí reportados se basan en una encuesta efectuada a 35 JV internacionales y ofrece resultados alineados con la literatura existente. Los resultados muestran que el desempeño organizacional mejora cuando se reduce la incertidumbre de factores percibidos como controlables por los directivos; un factor se percibe como controlable cuando mayor es la experiencia que el directivo tiene con el mismo. La incertidumbre, según la define Galbraith (1973), se reduce vía un uso intensivo de los sistemas de contabilidad de gestión, lo que su vez impacta positivamente en el desempeño organizacional.

Paper re-use: Toner-print removal by laser ablation

This article explores the possibility of using a laser to remove toner-print from office paper. Removal of print would allow paper to be re-used instead of being recycled or disposed into a landfill. This might reduce climate change gas emissions per tonne of office paper by between 45% and 95%. Although there is little previous research on the area, a number of related articles on paper conservation methods using laser radiation can be found in literature. Different authors have studied the effects of laser energy on blank paper and its application for cleaning soiled paper. However, this study examines toner-print removal from paper by laser ablation. In this article a laser in the visible range is applied to a single toner-paper combination with a range of energy fluences. Results are evaluated by means of colour measurements under the L*a*b* colour space and SEM images. Analysis of the samples reveals that there are parameters under which it is possible to remove toner from paper without causing significant discolouration or damage to the substrate. This means that it is technically possible to remove toner-print for paper re-use.