Active Discriminative Text Representation Learning

We propose a new active learning (AL) method for text classification with convolutional neural networks (CNNs). In AL, one selects the instances to be manually labeled with the aim of maximizing model performance with minimal effort. Neural models capitalize on word embeddings as representations (features), tuning these to the task at hand. We argue that AL strategies for multi-layered neural models should focus on selecting instances that most affect the embedding space (i.e., induce discriminative word representations). This is in contrast to traditional AL approaches (e.g., entropy-based uncertainty sampling), which specify higher level objectives. We propose a simple approach for sentence classification that selects instances containing words whose embeddings are likely to be updated with the greatest magnitude, thereby rapidly learning discriminative, task-specific embeddings. We extend this approach to document classification by jointly considering: (1) the expected changes to the constituent word representations; and (2) the model's current overall uncertainty regarding the instance. The relative emphasis placed on these criteria is governed by a stochastic process that favors selecting instances likely to improve representations at the outset of learning, and then shifts toward general uncertainty sampling as AL progresses. Empirical results show that our method outperforms baseline AL approaches on both sentence and document classification tasks. We also show that, as expected, the method quickly learns discriminative word embeddings. To the best of our knowledge, this is the first work on AL addressing neural models for text classification.Comment: This paper got accepted by AAAI 201

A pilot study of an employee developed observational tool as a valid and reliable measure of organisational safety

Given the increasing high social and economic costs of occupational injury and illness to the Australian community, identification of initiatives to reduce the burden is urgently required. Paramount to reversing this trend is the need to identify and address the causes of the injury and illness. Employee involvement in occupational health and safety has for some time been espoused as an essential element in any occupational health and safety program, but its relationship with safety performance still remains unexplored. Although various theories suggest that the involvement of employees will increase their sense of ownership, there is little research to suggest that employees have the ability to develop a valid and reliable tool to measure safe practices in the workplace. The primary purpose of this study was to provide preliminary evidence of content and construct validity of an employee developed checklist in measuring compliance with safe behaviours. The second objective was to compare behaviours at two workplaces, one with an incentive scheme to promote safe behaviour and one without. The third objective was to determine the relationships between demographic characteristics of participants and compliance with safe behaviour. The study was conducted in two distinct phases. The first phase was an instrument development phase while the second was an implementation phase. Phase I involved the design of an employee developed checklist (EDC) and a theoretically developed checklist (TDC). Content validity testing was conducted by a panel of five experts in the field of instrument design and occupational health and safety. Phase II involved the observation of a sample of 44 ride on lift truck operators from two large manufacturing and logistics companies based in Victoria, over a three month period to measure compliance with safe work practices. Data was analysed to establish whether the EDC is a valid and reliable tool when compared against the TDC. The results provide preliminary evidence to suggest that employees possess the necessary skill and knowledge to develop a valid observational checklist. A Wilcoxon signed-ranks test for dependent samples indicates that there was no significant difference between the compliance scores recorded on the EDC and the scores recorded on the TDC. Further analysis of scores obtained for three items on the EDC were analysed against similar items on the TDC with no significant deficiencies found. Additionally, analysis of the correlation between the scores obtained on the TDC and EDC revealed a moderately strong positive relationship between the two checklists (r, = 0.414, p=.032). Inter rater reliability testing by intra class correlation and percentage agreement revealed problems with both the EDC and TDC, which may be partially explained by the relatively high level of compliance with safe behaviour at both sites and the method of testing. In this sample, age, gender and the presence of safety incentive schemes had no significant effect on the level of compliance. The level of experience did, however, show a positive relationship with compliance levels (r, = 0.32, p=.048). The results of this study present a number of potential benefits for workplaces including the justification of employee involvement in occupational health and safety measurement, employee involvement in goal setting and the feasibility of developing a proactive, inexpensive and flexible measure of occupational health and safety performance

Shear-induced overaging in a polymer glass

A phenomenon recently coined as ``overaging'' implies a slowdown in the collective (slow) relaxation modes of a glass when a transient shear strain is imposed. We are able to reproduce this behavior in simulations of a supercooled polymer melt by imposing instantaneous shear deformations. The increases in relaxation times $\Delta \tau_{1/2}$ rise rapidly with deformation, becoming exponential in the plastic regime. This ``overaging'' is distinct from standard aging. We find increases in pressure, bond-orientational order and in the average energy of the inherent structures ($$) of the system, all dependent on the size of the deformation. The observed change in behavior from elastic to plastic deformation suggests a link to the physics of the ``jammed state''Comment: 5 pages including 5 figure

Rehabilitation of hand in subacute tetraplegic patients based on brain computer interface and functional electrical stimulation: a randomised pilot study

Objective. To compare neurological and functional outcomes between two groups of hospitalised patients with subacute tetraplegia. Approach. Seven patients received 20 sessions of brain computer interface (BCI) controlled functional electrical stimulation (FES) while five patients received the same number of sessions of passive FES for both hands. The neurological assessment measures were event related desynchronization (ERD) during movement attempt, Somatosensory evoked potential (SSEP) of the ulnar and median nerve; assessment of hand function involved the range of motion (ROM) of wrist and manual muscle test. Main results. Patients in both groups initially had intense ERD during movement attempt that was not restricted to the sensory-motor cortex. Following the treatment, ERD cortical activity restored towards the activity in able-bodied people in BCI-FES group only, remaining wide-spread in FES group. Likewise, SSEP returned in 3 patients in BCI-FES group, having no changes in FES group. The ROM of the wrist improved in both groups. Muscle strength significantly improved for both hands in BCI-FES group. For FES group, a significant improvement was noticed for right hand flexor muscles only. Significance. Combined BCI-FES therapy results in better neurological recovery and better improvement of muscle strength than FES alone. For spinal cord injured patients, BCI-FES should be considered as a therapeutic tool rather than solely a long-term assistive device for the restoration of a lost function

Holding Back the Flood: Thom Yorke, Radiohead, and Post-Industrial Capitalism

I am not a pop critic, or an academic, at least in any traditional or certifiable sense. I am, however, an American. A privileged, white, male American, to be more precise. I have never begged for food, slept outside (except during an ill-fated school year as a Boy Scout), and I have certainly never stared down the business end of a Kalashnikov. I have never witnessed, much less been victim of, a natural disaster (I did see a tornado once growing up outside Chicago. Or maybe I dreamed that). I have never dealt with (corrupt) cops, or had to face discrimination because of my gender, sexuality, race, socioeconomic status, et. al. I don\u27t count discrimination against privileged, white American males as a serious prejudice; in fact, given my own left-leaning tendencies, I once had something of a problem with privileged, white American males myself. My point here is that I like Radiohead. A lot. I was only eight years-old, obsessed with archaeology and spelling when Creep first hit the airwaves and Pablo Honey flew off record store shelves. I first heard them in 2001, when I bought their 1997 magnum opus 2, OK Computer, on a whim. This does not make me much of a Radiohead fan, just as I am no rock writer, pop critic, or an academic. I dabble in all three, but honestly, I am just an overeducated American. I imagine a lot of rock writers3 and pop critics are, too. So what gives me the right to pen a sixty-page essay on the relationship between Radiohead and subjects like existential philosophy, environmental concerns, or contemporary politics

Demand Curve Effects in Experimental Auctions: The Effect of Quantity Already Owned

Most studies utilizing experimental auction mechanisms to elicit consumers’ willingness to pay are designed to avoid potential substitution or demand-curve effects that may influence bid prices. However, previous research and auction designs have not considered the potential impact on bid prices of commodity inventories held by auction participants that were obtained through transactions outside of the auction. This omission may present a problem for interpreting and analyzing auction data. Using bids from a random nth-price auction of fresh vegetables conducted in a laboratory style setting, we test whether participants’ outside inventories affect bidding behavior. We find that bidders do in fact consider their inventories, resulting in lower bid prices by individuals with quantity already owned.Consumer/Household Economics, Demand and Price Analysis,