This paper extends Lucas (1978) to a production economy with two capital goods. It is an RBC model in which each unit of investment requires a new idea, an “option”. When options are scarce, new capital is harder to put in place and the value of old capital rises. Thus the stock market and Tobin’s Q are negative indexes of intangibles. During a boom, Q rises gradually, as options are used up. B...

0747-5632/$ see front matter 2012 Elsevier Ltd. A http://dx.doi.org/10.1016/j.chb.2012.04.018 ⇑ Corresponding author. E-mail addresses: [email protected] (B.D. Hom edu (E.O. Hayward), [email protected] (J. Frye), ja The present study explores the relation among different characteristics of preadolescents and their video game habits and preferences. Specifically, the predictive power of age...

As many popular text genres such as blogs or news contain opinions by multiple sources and about multiple targets, finding the sources and targets of subjective expressions becomes an important sub-task for automatic opinion analysis systems. We argue that while automatic semantic role labeling systems (ASRL) have an important contribution to make, they cannot solve the problem for all cases. B...

We propose a framework to evaluate the risk incurred when managing users and permissions through RBAC. The risk analysis framework does not require roles to be defined, thus making it applicable before the role engineering phase. In particular, the proposed approach highlights users and permissions that markedly deviate from others, and that might consequently be prone to error when roles are o...

This paper proposes a model for co-creation of games as alternative media. The model uses actual play practices to understand the political and cultural influence co-creation might have in the relationship between the owner of the game and the players. The model requires for player creation of a text or communication infrastructure that changes the properties of the game from which play emerges...

In this paper we address the problem of reducing the role mining complexity in RBAC systems. To this aim, we propose a three steps methodology: first, we associate a weight to roles; second, we identify user-permission assignments that cannot belong to roles with a weight exceeding a given threshold; and third, we restrict the role-finding problem to user-permission assignments identified in th...

In this paper we investigate one aspect of RBAC administration concerning assignment of users to roles. A user-role assignment model can also be used for managing user-group assignment. We overview a constrained user-group assignment model and describe its implementation in the Linux system. Rather than set user and file rights individually for each and every user, the administrator can give ri...

The introduction of molecular biology techniques, especially of DNA analysis, for human identification is a recent advance in legal medicine. Substantial effort has continuously been made in an attempt to identify cadavers and human remains after wars, socio-political problems and mass disasters. In addition, because of the social dynamics of large cities, there are always cases of missing peop...

This paper presents our work on Semantic Role Labeling using a Transformation-Based ErrorDriven approach in the style of Eric Brill (Brill, 1995). Our approach achieved an overall F1 score of 43.48 on non-verb annotations. We believe our approach is noteworthy because of its novelty in this area and because it produces short lists of human-understandable transformation rules as its output.