Contactless angle detection using permalloy

An overview is given of measurements on angle detectors. The detectors consist of a pair of planar-Hall elements opposite to a rotatable magnet. The measurements are performed on a number of planar-Hall elements of different shape and size, and show good agreement with a previously described theoretical mode. To increase the accuracy of the angle detector, three modifications of the original concept of the planar-Hall elements are treated: a ring-shaped element having increased output voltage; an optimized configuration of a pair of planar-Hall elements and a permanent magnet, to cancel out the effects of magnetic anisotropy in the permalloy on the accuracy of the angle detector; and an annealing step at 500 degrees C applied to the permalloy to create a magnetically isotropic film. The results of measurements on planar-Hall elements as suggested in modifications are presented and show good agreement with theory

Is Simpler Always Better? Consumer Evaluations of Front-of-Package Nutrition Symbols

Consumers of packaged goods products in the United States recently have faced an onslaught of front-of-package (FOP) nutrition symbols and icons, including the controversial “Smart Choices” single summary indicator. In a between-subjects experiment with 520 adult consumers, the authors compare effects of the Smart Choices (SC) icon, the more complex Traffic Light–Guideline Daily Amounts (TLGDAs) icon, and a no-FOP icon control for a nutritionally moderate food that qualifies for the SC icon. Drawing from principles of heuristic processing and halo effects, the authors predict and find that the SC icon can lead to positive (and potentially misleading) nutrient evaluations and product healthfulness when compared with the TL-GDA icon or no-FOP icon control. When the Nutrition Facts Panel is not available, the TL-GDA icon results in substantially greater nutrition accuracy scores than with the SC icon or control. The authors also find that nutrition consciousness is more likely to moderate effects related to the Nutrition Facts Panel than the FOP nutrition icon information. Implications are offered for public health officials, nutrition researchers, and food manufacturers, as the Food and Drug Administration considers FOP nutrition alternatives for use in the United States

Energy consumption in coded queues for wireless information exchange

We show the close relation between network coding and queuing networks with negative and positive customers. Moreover, we develop Markov reward error bounding techniques for networks with negative and positive customers. We obtain bounds on the energy consumption in a wireless information exchange setting using network coding

Linear programming error bounds for random walks in the quarter-plane

We consider approximation of the performance of random walks in the quarter-plane. The approximation is in terms of a random walk with a product-form stationary distribution, which is obtained by perturbing the transition probabilities along the boundaries of the state space. A Markov reward approach is used to bound the approximation error. The main contribution of the work is the formulation of a linear program that provides the approximation error

A Linear Programming Approach to Error Bounds for Random Walks in the Quarter-plane

We consider the approximation of the performance of random walks in the quarter-plane. The approximation is in terms of a random walk with a product-form stationary distribution, which is obtained by perturbing the transition probabilities along the boundaries of the state space. A Markov reward approach is used to bound the approximation error. The main contribution of the work is the formulation of a linear program that provides the approximation error

Understanding How Graphic Pictorial Warnings Work on Cigarette Packaging

The 2009 Family Smoking Prevention and Tobacco Control Act requires cigarette packages to contain stronger warnings in the form of color, graphic pictures depicting the negative health consequences of smoking. The authors present results from a between-subjects experiment with more than 500 smokers that test (1) the effectiveness of pictorial warnings that vary in their graphic depiction of the warning and (2) an underlying mechanism proposed to drive potential effects of the manipulation of the graphic depiction. The findings indicate that more graphic pictorial warning depictions strengthen smokers’ intentions to quit smoking. Recall of warning message statements is reduced by moderately or highly graphic pictures compared with a no picture control or less graphic pictures. The results also show that the graphic warnings affect evoked fear, and in turn, fear mediates the effects of the graphic warning depiction on intentions to quit for the sample of smokers. This pattern of results indicates that though ighly graphic pictures may reduce specific message recall and limit the direct effect of recall on intentions to quit, highly graphic pictures increase intentions to quit smoking through evoked fear (i.e., fear fully mediates the effect of the graphic depiction level). The authors discuss implications for consumer health and policy decisions

Energy-delay tradeoff in wireless network coding

A queueing model for wireless communication network in which network coding is employed is introduced. It is shown that networks with coding are closely related to queueing networks with positive and negative customers. Analytical upper and lower bounds on the energy consumption and the delay are obtained using a Markov reward approach. The tradeoff between minimizing energy consumption and minimizing delay is investigated. Exact expressions are given for the minimum energy consumption and the minimum delay attainable in a network