The Life-and-Death Journey of the Soul : Interpreting the Myth of Er

Publisher PD

Cortical Dynamics of Boundary Segmentation and Reset: Persistence, Afterimages, and Residual Traces

Using a neural network model of boundary segmentation and reset, Francis, Grossberg, and Mingolla (1994) linked the percept of persistence to the duration of a boundary segmentation after stimulus offset. In particular, the model simulated the decrease of persistence duration with an increase in stimulus duration and luminance. Thc present article reveals further evidence for the neural mechanisms used by the theory. Simulations show that the model reset signals generate orientational afterimages, such as the MacKay effect, when the reset signals can be grouped by a subsequent boundary segmentation that generates illusory contours through them. Simulations also show that the same mechanisms explain properties of residual traces, which increase in duration with stimulus duration and luminance. The model hereby discloses previously unsuspected mechanistic links between data about persistence and afterimages, and helps to clarify the sometimes controversial issues surrounding distinctions between persistence, residual traces, and afterimages.Air Force Office of Scientific Research (F49620-92-J-0499); Office of Naval Research (N00014-91-J-4100, N00014-92-J-4015

Implementing log-add algorithm in hardware

A hardware implementation of the log-add algorithm, being a simple method of computing ln(A + B) given ln(A) and ln(B), as used in speech recognition, is presented. It is shown that it can be efficiently implemented in hardware using a small look-up table plus some additional arithmetic logic, with no significant loss of accuracy over direct calculation

Commutative Schur Rings Over Symmetric Groups II: The Case n=6

We determine the commutative Schur rings over $S_6$ that contain the sum of all the transpositions in $S_6$. There are eight such types (up to conjugacy), of which four have the set of all the transpositions as a principal set of the Schur ring

Grounded: characterising the market exit of European low cost airlines

The aim of this paper is to undertake a comprehensive study of LCC market entry and exit in Europe between 1992 and 2012. In the 20 year period between 1992 and 2012, 43 low cost carriers (LCCs) have taken advantage of the progressive liberalisation of the European aviation market and commenced scheduled flight operations within the continent. Of these 43, only 10 remain operational, a failure rate of 77%. This paper contributes to extant literature on LCCs by examining the market entry, business practices, operating longevity and fate of failed operators to characterise European LCC market exit. Drawing on the findings of a detailed continental-wide study, the paper identifies that an airline’s start-up date, the nature and size of its operation and the size and composition of its aircraft fleet are key factors which influence LCC success and failure. The implications for both European and emerging LCC markets are discussed

Catholic and charismatic : a study in personality theory within Catholic congregations

This study set out to conceptualise and measure Charismatic orientation (openness to charismatic experience) and traditional Catholic orientation (Catholic identity) among a sample of 670 Catholic churchgoers in order to test whether attachment to Catholic Charismatic Renewal strengthened or weakened the sense of traditional Catholic identity among churchgoing Catholics. This research question was set within the broader consideration of the location of Charismatic orientation and Catholic orientation within Eysenck's three dimensional model of personality. The data revealed a strong positive association between Charismatic experience and Catholic identity. Higher scores on the index of Charismatic orientation were associated with higher extraversion scores, with higher neuroticism scores, and with higher levels of mass attendance and personal prayer. Higher scores on the index of Catholic orientation were associated with being female, being older, higher neuroticism scores, and higher levels of mass attendance and personal prayer

Speech Recognition on an FPGA Using Discrete and Continuous Hidden Markov Models

Speech recognition is a computationally demanding task, particularly the stage which uses Viterbi decoding for converting pre-processed speech data into words or sub-word units. Any device that can reduce the load on, for example, a PC’s processor, is advantageous. Hence we present FPGA implementations of the decoder based alternately on discrete and continuous hidden Markov models (HMMs) representing monophones, and demonstrate that the discrete version can process speech nearly 5,000 times real time, using just 12% of the slices of a Xilinx Virtex XCV1000, but with a lower recognition rate than the continuous implementation, which is 75 times faster than real time, and occupies 45% of the same device

Implementing a simple continuous speech recognition system on an FPGA

Speech recognition is a computationally demanding task, particularly the stage which uses Viterbi decoding for converting pre-processed speech data into words or sub-word units. We present an FPGA implementations of the decoder based on continuous hidden Markov models (HMMs) representing monophones, and demonstrate that it can process speech 75 times real time, using 45% of the slices of a Xilinx Virtex XCV100

What Makes a Test Score? The Respective Contributions of Pupils, Schools and Peers in Achievement in English Primary Education

This study develops an analytical framework for evaluating the respective contributions of pupils, peers, and school quality in affecting educational achievement. We implement this framework using rich data from England that matches pupils to their primary schools. The dataset records all English pupils and their test scores in Key Stage 1 (age 7) and Key Stage 2 (age 11) national examinations. The quality of the data source, coupled with our econometric techniques, allows us to assess the respective importance of different educational inputs. We can distinguish school effects that affect all pupils irrespective of their year and grade of study, from school-grade-year effects. Identification of pupil effects separately from these school-grade-year effects is achieved because students are mobile across schools. Peer effects are identified assuming variations in school-grade-year group composition in adjacent years are exogenous. We estimate three different specifications, the most general allowing Key Stage 2 results to be affected by the Key Stage 1 school(-grade-year) at which the pupil studied. We discuss the validity of our various exogeneity assumptions. Estimation results show statistically significant pupil ability, school and peer effects. Our analysis suggests the following ranking: pupils' ability and background are more important than school time-invariant inputs. Peer effects are significant, but small.Primary education, testing, educational achievement

Fighting for Empire: the contribution and experience of the New South Wales Mounted Rifles first contingent in the South African War.

The South African War was Australia’s first war. Historians have insufficiently acknowledged the contribution of the New South Wales Mounted Rifles first contingent in this conflict. Unlike most Australian soldiers, the Mounted Rifles had a unique experience. Taking part in both the conventional and guerrilla phase of the war, they encountered both a familiar and unfamiliar war. After the war, they returned to a society that was largely indifferent towards them. This thesis improves our understanding of Australia’s contribution in the South African War and reveals how the antipodes were actively involved in a wider imperial network