We introduce the notion of watching systems in graphs, which is a generalization of that of identifying codes. We give some basic properties of watching systems, an upper bound on the minimum size of a watching system, and results on the graphs which achieve this bound; we also study the cases of the paths and cycles, and give complexity results.

We present a previously unreported series of five cases of acute angle closure glaucoma associated with watching the Australia soap opera "Neighbours". Two cases were bilateral and associated with watching two episodes of "Neighbours" on the same day. The pathogenesis, and possible role of watching soap operas in the causation of primary angle closure glaucoma is discussed.

In this study, the quality of sediment and surface water in two natural wetlands, Paca Tragadero, central region Peru was evaluated using pollution indices, including geoaccumulation index, pollutant load modified degree, potential ecological risk site rank for four heavy metals. Principal component analysis used to identify metal contaminant sources. The determination Fe, Zn, Pb, As performed ...

It is suggested that gravity waves could, in several cases, be detected by means of already (or shortly to be) available technology, independently of current efforts of detection. The present is a follow-up on a recently suggested detection strategy based on gravity-wave-induced deviations of null geodesics. The new development is that a way was found to probe the waves close to the source, whe...

In this paper, a method for measuring 3D cognitive load is proposed. For that, 8-channel EEG data when watching 2D and 3D displays are 2dimensionally reduced using principal component analysis then the reduced features are visualized and compared. Consequently, we confirmed that the difference between two feature distributions of watching 2D and 3D at early stage was significant then the differ...

INTRODUCTION Suicidal behavior in media may promote others towards suicide. No published study was found about suicidal attempt in children less than 10 years old after watching a homicidal behavior. CASE PRESENTATION This is a report of a 7 year old boy referred because he hanged himself after watching homicidal behavior of hanging in a fictional movie. DISCUSSION To the author's knowledge...

BACKGROUND The aim of this study is to explore the association between family-related factors and excessive time spent on screen-based activities among school-aged children. METHODS A cross-sectional survey using the methodology of the Health Behaviour in School-aged Children study was performed in 2013, with data collected from Slovak (n = 258) and Czech (n = 406) 11- and 15-year-old childre...

In contrast to the well-established scientific evidence linking negative emotional states (e.g., depression, anxiety, or anger) to increased risk for cardiovascular disease, much less is known about the association between positive emotional states (e.g., laughter, happiness) and cardiovascular health. We determined the effects of mirthful laughter, elicited by watching comic movies, on endothe...

It is unclear if children of different weight status differ in their nutritional habits while watching television. The objective of the present paper was to determine if children who are overweight or obese differ in their frequency of consumption of six food items while watching television compared with their normal-weight counterparts. A cross-sectional study of 550 children (57·1 % female; m...

Objective: To determine the effects of watching a professional baseball game on the affect and subjective happiness of elders without a specific team to support. Method: Elderly Japanese (n = 16) were instructed to watch baseball games at a ballpark. They answered a questionnaire several weeks before (baseline) and, on the day of the game, before and after watching the game. Participants' affec...