Method of identifying clusters representing statistical dependencies in multivariate data

Approach is first to cluster and then to compute spatial boundaries for resulting clusters. Next step is to compute, from set of Monte Carlo samples obtained from scrambled data, estimates of probabilities of obtaining at least as many points within boundaries as were actually observed in original data

Assessment of Thematic Mapper band-to-band registration by the block correlation method

Rectangular blocks of pixels from one band image were statistically correlated against blocks centered on identical pixels from a second band image. The block pairs were shifted in pixel increments both vertically and horizontally with respect to each other and the correlation coefficient to the maximum correlation was taken as the best estimate of registration error for each block pair. For the band combinations of the Arkansas scene studied, the misregistration of TM spectral bands within the noncooled focal plane lie well within the 0.2 pixel target specification. Misregistration between the middle IR bands is well within this specification also. The thermal IR band has an apparent misregistration with TM band 7 of approximately 3 pixels in each direction. The TM band 3 has a misregistration of approximately 0.2 pixel in the across-scan direction and 0.5 pixel in the along-scan direction, with both TM bands 5 and 7

Thematic Mapper image quality: Preliminary results

Based on images analyzed so far, the band to band registration accuracy of the thematic mapper is very good. For bands within the same focal plane, the mean misregistrations are well within the specification, 0.2 pixels. For bands between the cooled and uncooled focal planes, there is a consistent mean misregistration of 0.5 pixels along-scan and 0.2-0.3 pixels across-scan. It exceeds the permitted 0.3 pixels for registration of bands between focal planes. If the mean misregistrations were removed by the data processing software, an analysis of the standard deviation of the misregistration indicates all band combinations would meet the registration specifications except for those including the thermal band. Analysis of the periodic noise in one image indicates a noise component in band 1 with a spatial frequency equivalent to 3.2 pixels in the along-scan direction

Theoretical study of piezotronic metal–insulator–semiconductor tunnel devices

Piezotronics has been an emerging concept coupling piezoelectric and semiconducting properties with potential applications in sensors, flexible electronics and nanoelectromechanical systems (NEMS). Piezoelectric field is created under an applied strain, which controls the carrier generation, transport, separation or recombination processes at the interface or junction of the semiconductor devices. Based on the piezotronic theory, we present a one-dimensional model for the metal-insulator-semiconductor (MIS) tunnel diode based on the piezoelectric semiconductor. Analytical solutions of piezoelectric modulated tunneling are described to reveal the piezotronic effect on the MIS tunnel junction. Numerical simulation of the carrier transport properties is provided for demonstrating the piezotronic effect on MIS tunnel devices

WESTT (Workload, Error, Situational Awareness, Time and Teamwork): An analytical prototyping system for command and control

Modern developments in the use of information technology within command and control allow unprecedented scope for flexibility in the way teams deal with tasks. These developments, together with the increased recognition of the importance of knowledge management within teams present difficulties for the analyst in terms of evaluating the impacts of changes to task composition or team membership. In this paper an approach to this problem is presented that represents team behaviour in terms of three linked networks (representing task, social network structure and knowledge) within the integrative WESTT software tool. In addition, by automating analyses of workload and error based on the same data that generate the networks, WESTT allows the user to engage in the process of rapid and iterative “analytical prototyping”. For purposes of illustration an example of the use of this technique with regard to a simple tactical vignette is presented

Task analysis for error identification: Theory, method and validation

This paper presents the underlying theory of Task Analysis for Error Identification. The aim is to illustrate the development of a method that has been proposed for the evaluation of prototypical designs from the perspective of predicting human error. The paper presents the method applied to representative examples. The methodology is considered in terms of the various validation studies that have been conducted, and is discussed in the light of a specific case study

Two-Point Entanglement Near a Quantum Phase Transition

In this work, we study the two-point entanglement S(i,j), which measures the entanglement between two separated degrees of freedom (ij) and the rest of system, near a quantum phase transition. Away from the critical point, S(i,j) saturates with a characteristic length scale $\xi_E$, as the distance |i-j| increases. The entanglement length $\xi_E$ agrees with the correlation length. The universality and finite size scaling of entanglement are demonstrated in a class of exactly solvable one dimensional spin model. By connecting the two-point entanglement to correlation functions in the long range limit, we argue that the prediction power of a two-point entanglement is universal as long as the two involved points are separated far enough.Comment: published versio

Storytelling as 'unorthodox' agency:negotiating the 2012 family immigration rules (United Kingdom)

This article attends to the lived experience of binational families subject to the 2012 family immigration rules (FIR). It seeks to enrich the pre-existing discussions of family migration within the European Union (EU) and the United Kingdom, focusing on the ‘micro-political’ experiences of those whose lives have been adversely affected by their introduction. It draws on the life writings of binational families, suggesting that a micro-political focus reveals an ongoing neuropolitical experience that traditional accounts of moral agency are ill-equipped to negotiate. The article suggests an unorthodox interpretation of agency premised on storytelling, while probing the tensions that emerge when this lived experience is framed in such a manner. It concludes by positing a series of questions relating to the value of a neuropolitical labelling of the subject and suggests a need to further engage with traumatic interpretations of harm at the intersection of citizenship rights and mobility rights

The Impact of Sectoral Minimum Wage Laws on Employment, Wages and Hours of Work in South Africa

This paper attempts to investigate the impact of sectoral wage laws in South Africa. Specifically, we examine the impact of minimum wage laws promulgated in the Retail, Domestic work, Forestry, Security, and Taxi sectors using 15 waves of biannual Labour Force Survey data for the 2000-2007 period