University of North Carolina at Charlotte

About: University of North Carolina at Charlotte is a education organization based out in Charlotte, North Carolina, United States. It is known for research contribution in the topics: Population & Poison control. The organization has 8772 authors who have published 22239 publications receiving 562529 citations. The organization is also known as: UNC Charlotte & UNCC.

Scintillation of Airy beam arrays in atmospheric turbulence

Abstract: We investigate the scintillation properties of Airy beam arrays in atmospheric turbulence By utilizing the "self-bending" propagation property of Airy beams, the constituent beamlets propagate through relatively independent regions of turbulence but still largely overlap at the on-axis detector Through numeric simulations, it is shown that the scintillation of an Airy beam array is significantly reduced and close to the theoretical minimum

It’s All in the Timing: Simple Active Portfolio Strategies that Outperform Naïve Diversification

Abstract: DeMiguel, Garlappi, and Uppal (2009) report that naive diversification dominates mean-variance optimization in out-of-sample asset allocation tests. Our analysis suggests that this is largely due to their research design, which focuses on portfolios that are subject to high estimation risk and extreme turnover. We find that mean-variance optimization often outperforms naive diversification, but turnover can erode its advantage in the presence of transaction costs. To address this issue, we develop 2 new methods of mean-variance portfolio selection (volatility timing and reward-to-risk timing) that deliver portfolios characterized by low turnover. These timing strategies outperform naive diversification even in the presence of high transaction costs.

Identity-Based Threshold Decryption

Abstract: In this paper, we examine issues related to the construction of identity-based threshold decryption schemes and argue that it is important in practice to design an identity-based threshold decryption scheme in which a private key associated with an identity is shared. A major contribution of this paper is to construct the first identity-based threshold decryption scheme secure against chosen-ciphertext attack. A formal proof of security of the scheme is provided in the random oracle model, assuming the Bilinear Diffie-Hellman problem is computationally hard. Another contribution of this paper is, by extending the proposed identity-based threshold decryption scheme, to construct a mediated identity-based encryption scheme secure against more powerful attacks than those considered previously.

Cracking Jokes and Crafting Selves: Sensemaking and Identity Management Among Human Service Workers

Abstract: Using interview and participant-observation data gathered among correctional officers, 911 call-takers, and firefighters, this study explores how humor enables human service workers to manage identity and make sense of their work in relation to preferred notions of self. In the face of trying job duties, humor serves employee identity needs through differentiation, superiority, role distance, and relief. Moreover, humor serves as a sensemaking vehicle through which employees select, maintain, reproduce, and reify preferred interpretations of work. The analysis characterizes humor as an unfolding, collaborative, and interactional practice that can play a key part in socializing newcomers, building knowledge, and constituting the organizing process.