In this paper, we present the results of our long-term study on use of a voice assistant (Amazon Alexa via Amazon Echo Dot) in nine families with children and no previous experience with this technology. The study was conducted over the course of 5 weeks during which the families could interact with the device freely. Three house visits were made to collect empirical data from the adult participants in form of questionnaires. Additionally, conversational data from log files of the voice assistant were obtained. These data were annotated and analyzed with a focus on communication breakdowns during human-assistant interaction. We investigate user behavior for both adults and children in such situations, its reasons and consequences for user satisfaction. This article provides qualitative analysis of three particularly interesting breakdown cases, as well as statistical analysis along several hypotheses and research questions combining empirical and conversational data. Described cases of communication breakdown illustrate findings from existing literature on the topic. The statistical analysis paints a mixed picture, however, it helped us identify further avenues for research, some of which can be explored with our data set in the future. We found a significant negative effect of the number of abandoned failed requests on user satisfaction, contrary to the number of successfully repaired requests that had no influence on user satisfaction. We discovered that users are more inclined to use reformulation as repair strategy when they do not perceive the emergence of miscommunication as their fault. We could not identify a significant effect of internal reasons for the choice of other strategies, so we suggest that situational clues such as the immediate response of the voice assistant are more important for the choice of repair strategy. Our results also hint that users distinguish between repair strategies differently, as the self-perceived frequency of repetitions and abortions of requests were found to be positive predictors for the use of reformulation-based strategies. With regards to the long-term aspect of the study, use of repetition as a repair strategy by both children and adults significantly decreased with time, no other changes were found for other strategies. Additionally, no significant impact of age on the choice of repair strategy was found, as well as no interaction effect between age and time.

There were studied working conditions and the state of the muscular-skeletal system in employees of the oil industry. Working conditions of employees of basic occupations are referred to the hazard Class 3.1 - 3.3. Significant physical exertion with the predominant load on the lumbar-sacral area, constrained posture, the exposure to the general vibration and adverse weather conditions contribute to the development of diseases of the muscular-skeletal and peripheral nervous system. The most perspective trend in solving problems of diseases of the muscular-skeletal system is the implementation of the complex of preventive measures including both primary and secondary prophylaxis.

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The estimation of professional risk on the basis of a priori and a posteriori criteria at five enterprises of the fuel and energy complex located in the Volga and Urals Federal Districts was carried out. Based on the conducted studies, a conceptual model for assessing risk management in oil producing, oil refining and petrochemical enterprises was developed, tested in real conditions and demonstrated high efficiency.

We have compared working conditions and health state of workers engaged in low- and large-tonnage ethylbenzene-styrene manufacturing. It has been shown that working conditions of low-tonnage workers are of сlass 3.3. They cause chronic occupational diseases as well as a high degree of work-related chronic diseases. Working conditions of large-tonnage workers are of сlass 3.1. Careful medical examination has not revealed any changes in «critical» organs and systems.