While a variety of image processing studies have been performed to quantify the potential performance of neural network-based models using high-quality still images, relatively few studies seek to apply those models to a real-time operational context. This paper seeks to extend prior work in neural-network-based mask detection algorithms to a real-time, low-power deployable context that is conducive to immediate installation and use. Particularly relevant in the COVID-19 era with varying rules on mask mandates, this work applies two neural network models to inference of mask detection in both live (mobile) and recorded scenarios. Furthermore, an experimental dataset was collected where individuals were encouraged to use presentation attacks against the algorithm to quantify how perturbations negatively impact model performance. The results from evaluation on the experimental dataset are further investigated to identify the degradation caused by poor lighting and image quality, as well as to test for biases within certain demographics such as gender and ethnicity. In aggregate, this work validates the immediate feasibility of a low-power and low-cost real-time mask recognition system.

Employing insights from both pre-critical Jewish commentators and critical scholars, this article offers some suggestions for the source-critical analysis of Exod. xxxiii 12–23. After briefly reviewing the history of modern source-critical analysis of the passage and considering the insights of several medieval Jewish commentators, it analyzes the text in two units, vv. 12-17 and vv. 18-23. Taking a clue from these pre-modern readers, it seeks to perform the modern critical task of distinguishing the text's sources by looking for the points at which the text fits together and for the meaning created by this splicing of sources rather than focusing primarily on the text's internal inconsistencies per se. In conclusion, it is suggested that in each of these units, the blending of sources has transformed a personal request of Moses into Moses' intercession for Israel to enable the Lord's ongoing presence in the midst of his people.