A modified conjugate gradient-based Elman neural network

Elman recurrent network is a representative model with feedback mechanism. Although gradient descent method has been widely used to train Elman network, it frequently leads to slow convergence. According to optimization theory, conjugate gradient method is an alternative strategy in searching the descent direction during training. In this paper, an efficient conjugate gradient method has been presented to reach the optimal solution in two ways: (1) constructing a more effective conjugate coefficient, (2) determining adaptive learning rates in terms of the generalized Armijo search method. Experiments show that the performance of the new algorithm is superior to traditional algorithms, such as gradient descent method and conjugate gradient method. In particular, the new algorithm has better performance than the evolutionary algorithm. Finally, we prove the weak and strong convergence of the presented algorithm, i.e., the gradient norm of the error function with respect to the weight vectors converges to zero and the weight sequence approaches a fixed optimal point.     

Yielding and strain hardening in aluminium single-crystal foils subjected to tension and bending

A series of tensile and microbend tests were conducted on aluminium single-crystal foil specimens with different thicknesses ranging from 20 to 90?µm. Two different crystal orientations relative to the tensile direction were considered in the tests: one is an orientation that was excepted to activate at least four slip systems on four different slip planes, and the other is an orientation that was expected to activate only a single-slip system. In the tensile tests, typical size dependence of initial yield strength was observed. The microbend test method was extended to include a reversal of bending direction. Using the curves of bending moment normalized by the square of foil thickness versus surface strain, which were obtained from the reversed bending tests, the total amounts of strain hardening were divided into isotropic and kinematic hardening components. In the microbend tests, a pronounced size-dependent kinematic hardening behaviour was clearly observed; meanwhile, the amounts of isotropic hardening were very small, particularly for the single-slip orientation.     

Superordinate identities and intergroup conflict: The ingroup projection model

This chapter summarises results from a research programme on the psychological basis of tolerance and discrimination in intergroup relations, with particular consideration of the role of superordinate identities. According to the ingroup projection model, a relevant superordinate group provides dimensions and norms for comparisons between ingroup and outgroup. Groups gain positive value or status when they are considered prototypical for the (positively valued) superordinate group. Group members tend to generalise (project) distinct ingroup characteristics onto the superordinate category, implying the relative prototypicality of their ingroup. To the extent that outgroup difference is regarded as a deviation from the ethnocentrically construed prototype it is evaluated negatively. Our research studied consequences and determinants of ingroup projection, as well as moderators of its implications. The findings contribute to a deeper understanding of the processes involved in intergroup discrimination and indicate new pathways for the reduction of prejudice, towards mutual intergroup appreciation and tolerance.     

The parables of a green-eyed monster: Two tales about envy

Abstract

This paper describes how the dynamics of envy infiltrate interactions if envy is not contained. An interactive model of a 'giver' and 'recipient' is presented as a way of looking at envy and is applied to a clinical and organizational example. An analysis is made in terms of utilizing symbiosis defensively in order to avoid coming to grips with envy.     

Interethnic relations in Malaysia: Group identifications,indispensability and inclusive nationhood

This paper focuses on interethnic relations in Malaysia and examines survey data collected among Malay (n = 405), Chinese (n = 90), and Indian (n = 53) participants. In agreement with the Common In‐group Identity Model, inclusive nationhood was related to more positive out‐group attitudes. Relative in‐group indispensability was related to higher bias as predicted by the In‐group Projection Model. Furthermore, the dominant group of Malay had higher in‐group indispensability, more strongly endorsed an inclusive national representation, had stronger ethnic and national identification, and a stronger association between both identifications.     

Improving left spatial neglect through music scale playing

The study assessed whether the auditory reference provided by a music scale could improve spatial exploration of a standard musical instrument keyboard in right‐brain‐damaged patients with left spatial neglect. As performing music scales involves the production of predictable successive pitches, the expectation of the subsequent note may facilitate patients to explore a larger extension of space in the left affected side, during the production of music scales from right to left. Eleven right‐brain‐damaged stroke patients with left spatial neglect, 12 patients without neglect, and 12 age‐matched healthy participants played descending scales on a music keyboard. In a counterbalanced design, the participants' exploratory performance was assessed while producing scales in three feedback conditions: With congruent sound, no‐sound, or random sound feedback provided by the keyboard. The number of keys played and the timing of key press were recorded. Spatial exploration by patients with left neglect was superior with congruent sound feedback, compared to both Silence and Random sound conditions. Both the congruent and incongruent sound conditions were associated with a greater deceleration in all groups. The frame provided by the music scale improves exploration of the left side of space, contralateral to the right hemisphere, damaged in patients with left neglect. Performing a scale with congruent sounds may trigger at some extent preserved auditory and spatial multisensory representations of successive sounds, thus influencing the time course of space scanning, and ultimately resulting in a more extensive spatial exploration. These findings offer new perspectives also for the rehabilitation of the disorder.     

Self–Serving Perceptions of Terrorism Among Israelis and Palestinians

Definitions of political violence as terrorism are often tainted by self–serving motivations. Groups in conflict in particular tend to justify the use of indiscriminate violent means by highly regarded political ends. This study explores such self–serving perceptions of terrorism in the context of the Israeli–Palestinian conflict. In two surveys during December 2001, Israeli Jews, Israeli Arabs and Palestinians were asked whether 11 local and international incidents were acts of terrorism in their view, and whether they were considered acts of terrorism by the international community. Self–serving judgments on both sides were expected, but their extent is striking, and they extend also to the international incidents. Israeli Arabs judge all acts of violence as terrorism in high percentages. Israeli Jews and Palestinians' definitions present a mirror image; however, they do not project these definitions to the international community. Instead, they perceive an international norm largely divergent from their own point of view, inflating world judgment of their own acts of violence as terrorism and underestimating world judgment of the other side's violence, in what amounts to a hostile–world phenomenon.     

The Perceptual Pathway: Tracing the Mechanisms of Political Value Transfer across Generations

The transfer of political values across generations is commonly understood as a two-step process. First, the child perceives the characteristics of the parent, thereby creating an image of what the parent is like. Second, the child is persuaded to adapt his or her own views to that image. Despite its theoretical dominance, the details of this perceptual pathway of parentalsocialization have rarely been examined empirically. A major Swedish socialization study offers unusually good opportunities to investigate how it actually operates. The results indicate that the perceptual pathway as a whole is of great but not universal significance, that perception is more important than persuasion because of its greater variability, and that the conditions regulating the former are distinct from those regulating the latter. One implication of the results is that studies of interpersonal influence based on a single source (e.g., the child alone) are likely to yield a very lopsided view of the socialization process.