Montessori place-value and number expander cards

Montessori Cards are shown in the recently reprinted classic curriculum handbook (yellowcovered) 'Guidelines in Number' (1985, p 18). Unfortunately, exactly what this small, and limited sketch-picture might mean, in practice, is not necessarily clear. The use of Montessori number cards is discussed.

Wireless broadcast encryption based on smart cards

Wireless broadcasting is an efficient way to broadcast data to a large number of users. Some commercial applications of wireless broadcasting, such as satellite pay-TV, desire that only those users who have paid for the service can retrieve broadcast data. This is often achieved by broadcast encryption, which allows a station securely to broadcast data to a dynamically changing set of privileged users through open air. Most existing broadcast encryption schemes can only revoke a pre-specified number of users before system re-setup or require high computation, communication and storage overheads in receivers. In this paper, we propose a new broadcast encryption scheme based on smart cards. In our scheme, smart cards are used to prevent users from leaking secret keys. Additionally, once an illegally cloned smart card is captured, our scheme also allows tracing of the compromised smart card by which illegal smart cards are cloned, and can then revoke all cloned smart cards. The new features of our scheme include minimal computation needs of only a few modular multiplications in the smart card, and the capability to revoke up to any number of users in one revocation. Furthermore, our scheme is secure against both passive and active attacks and has better performance than other schemes.

Where I'm calling from : alterity and the other I of the unconcious

As I assess my fractured novel manuscript: a narrative in multiple first-person voices, I engage with writing that I produce at a primal/generative moment of narrative composition; I encounter writing that is both familiar and strange, known and other.

The sense in which I produce writing that is ‘other’ to me is intriguing. I recognise that a dichotomy between ‘self’ and ‘self-as-other’ exists in my writing and, in this, I am drawn to Derrida’s concept of alterity: to the idea that language is ghosted by the trace of the other. I am intrigued by the haunting shadow of trace: by the ‘other’ that simulates presence and makes the otherwise empty sign ‘full’ of meaning. 

When I acknowledge that my writing is at once strange and other, as well as familiar and known, I realise that the writing that I produce at a primal/generative moment of narrative composition is produced under the delusion of self-presence; it is produced under the delusion that meaning is present to consciousness ‘at a given moment’; it is produced when I am both ‘I’ and ‘not I’. This leads me to ask: What is my attitude to the effects that I produce when I am not I? What is my reaction when the other takes the floor?

To engage with these questions in the context of my fractured novel manuscript, is to engage with the possibilities for meaning that narrative, as a language map, encompasses; it is to engage in an inquiry about the relationship between language and semantic intention; it is to ask how my attitude toward the voice of the other in my writing affects the ‘finished’ product of the narrative text.

As I tackle these questions, I plot the operation of alterity; I plot the work of the unconscious as it operates at a primal/generative moment of narrative composition; I ask: how does the language of my fractured narrative mean? I ask: what is the relationship between meaning and authorial intention?

The concept of alterity explicates the ghostly shadow that lurks behind the sign, simulating presence and making the otherwise empty sign full of meaning. The concept of alterity therefore explains how my writing might be strange to me, in the sense that I am estranged from it (because it is not consciously, logically determined) but, simultaneously, how my writing is familiar, strangely familiar (in the sense of a latent, ghostly shadow, a web of unconscious associations).

Alterity recognises that the present (surface narrative) is infected by a past (primal/generative moment of narrative composition) that I cannot access in a definitive way.

Statelessness, identity cards and citizenship as status in the case of the Nubians of Kenya

Statelessness as a legal and political problem has attracted increasing attention from scholars and international advocacy organisations in recent years. This attention has predominantly focussed on the legal aspects of statelessness, and has generally held the acquisition of citizenship documentation as the primary goal in remedying citizenship deprivation. This article explores the merits of this focus through a case study of the Nubians of Kenya, widely considered stateless until recently. The article connects the focus on citizenship as documented status to a liberal conception of citizenship. The article identifies the ways in which this approach is helpful, that is, as a means of pursuing legal status and possession of individual rights. It then goes on to identify more important ways in which a liberal conception of citizenship falls short of accounting for the Nubians’ citizenship problems by neglecting the more collective dimensions of citizenship practice and recognition.

Noisy neighbours at the frog pond: effects of invasive cane toads on the calling behaviour of native Australian frogs

Invasive species can disrupt the communication systems that native biota use for reproductive interactions. In tropical Australia, invasive cane toads (Rhinella marina) breed in many of the same waterbodies that are used by native frogs, and males of both the invader and the native taxa rely on vocal signals to attract mates. We conducted playback experiments to test the hypothesis that calls of toads may influence the calling behaviour of frogs (Limnodynastes convexiusculus and Litoria rothii). Male L. convexiusculus adjusted their calling rate and the variance in inter-call interval in response to a variety of sounds, including the calls of cane toads as well as those of other native frog species, and other anthropogenic noise, whereas L. rothii did not. Within the stimulus periods of playbacks, male L. convexiusculus called more intensely during long silent gaps than during calling blocks. Thus, males of one frog species reduced their calling rate, possibly to minimise energy expenditure during periods of acoustic interference generated by cane toads. In spite of such modifications, the number of overlapping calls (within stimulus periods) did not differ significantly from that expected by chance. In natural conditions, the calls of cane toads are continuous rather than episodic, leaving fewer gaps of silence that male frogs could exploit. Future work could usefully quantify the magnitude of temporal (e.g. diel and seasonal) and spatial overlap between calling by toads and by frogs and the impact of call-structure shifts on the ability of male frogs to attract receptive females.

Letters, green cards, telephone calls and postcards: systematic and meta-analytic review of brief contact interventions for reducing self-harm, suicide attempts and suicide

BACKGROUND: There is growing interest in brief contact interventions for self-harm and suicide attempt. AIMS: To synthesise the evidence regarding the effectiveness of brief contact interventions for reducing self-harm, suicide attempt and suicide. METHOD: A systematic review and random-effects meta-analyses were conducted of randomised controlled trials using brief contact interventions (telephone contacts; emergency or crisis cards; and postcard or letter contacts). Several sensitivity analyses were conducted to examine study quality and subgroup effects. RESULTS: We found 14 eligible studies overall, of which 12 were amenable to meta-analyses. For any subsequent episode of self-harm or suicide attempt, there was a non-significant reduction in the overall pooled odds ratio (OR) of 0.87 (95% CI 0.74-1.04, P = 0119) for intervention compared with control. The number of repetitions per person was significantly reduced in intervention v. control (incidence rate ratio IRR = 066, 95% CI 0.54-0.80, P<0001). There was no significant reduction in the odds of suicide in intervention compared with control (OR = 0.58, 95% CI 0.24-1.38). CONCLUSIONS: A non-significant positive effect on repeated self-harm, suicide attempt and suicide and a significant effect on the number of episodes of repeated self-harm or suicide attempts per person (based on only three studies) means that brief contact interventions cannot yet be recommended for widespread clinical implementation. We recommend further assessment of possible benefits in well-designed trials in clinical populations.

A new semi-automated method for assessing avian acoustic networks reveals that juvenile and adult zebra finches have separate calling networks

Social networks are often inferred from spatial associations, but other parameters like acoustic communication are likely to play a central role in within group interactions. However, it is currently difficult to determine which individual initiates vocalizations, or who responds to whom. To this aim, we designed a method that allows analyzing group vocal network while controlling for spatial networks, by positioning each group member in equidistant individual cages and analyzing continuous vocal interactions semi-automatically. We applied this method to two types of zebra finch groups, composed of either two adult females and two juveniles, or four young adults (juveniles from the first groups). Young often co-occur in the same social group as adults but are likely to have a different social role, which may be reflected in their vocal interactions. Therefore, we tested the hypothesis that the social structure of the group influences the parameters of the group vocal network. We found that groups including juveniles presented periods with higher level of activity than groups composed of young adults. Using two types of analyses (Markov analysis and cross-correlation), we showed that juveniles as well as adults were more likely to respond to individuals of their own age-class (i.e. to call one after another, in terms of turn-taking, and within a short time-window, in terms of time delay). When juveniles turned into adulthood, they showed adult characteristics of vocal patterns. Together our results suggest that vocal behavior changes during ontogeny, and individuals are more strongly connected with individuals of the same age-class within acoustic networks.

Postmodern rituals : contemporary Australia responds to Bali

AFTER BALI, OCTOBER 12, 2002, A RANGE OF PUBLIC rituals took place in Australia to remember those who had been killed in the bombing. In Melbourne, the most visible, and collective ritual was the laying of flowers by members of the public on the steps of the State Parliament building, at the highly visible apex of Bourke St. This was a much-publicized event that took place over a period of two weeks. It was a riveting and moving sight/site for many people, who left notes expressing grief and regret, promises of remembrance, and of revenge. The choice of the site, and what would happen there, was prompted by talk-back listeners to Radio 3AW's Nell Mitchell, who called in with many different suggestions as to where and why the laying of flowers should take place. This essay seeks to understand the processes and purposes of the popular, public rituals after Bali, asking who made them, what was made, and how popular--that is, open to formation by those not primarily and directly connected with the mass media and party politics--were the constructions? Further, in calling such an event a "postmodern ritual," the essay will inaugurate an analysis, through cultural studies methodologies, of the attributes of public rituals in contemporary Western cultures.

Does the tendency to act impulsively underlie binge eating and alcohol use problems? An empirical investigation

The co-occurrence of problem drinking and binge eating and purging has been well documented. However, there has been relatively little investigation of etiological models that may influence the development of this  co-occurrence. This study tests the hypotheses that impulsivity is heightened in eating disordered women compared with controls, and that women with comorbid bulimia and alcohol use disorders show higher impulsivity than bulimic-only women. The Impulsivity scale, BIS/BAS scales, State Anxiety Inventory, and a behavioural measure of reward responsiveness (CARROT) were administered to 22 women with bulimia, 23 women with comorbid bulimia and alcohol abuse/dependence, and 21 control women. As hypothesised, eating disordered women scored higher than controls on several self-report measures of impulsivity and sorted cards faster during a financially rewarded trial on the behavioural task. Also, as predicted, comorbid women scored higher than bulimic women on the Impulsivity scale. These findings suggest that individual differences in impulsiveness and a tendency to approach rewarding stimuli may contribute to developing these disorders.