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When evaluating the individual reliability of semiconductor devices by gradual failures for a given operating time, the value of the electrical parameter of a particular instance for this operating time is predicted using the simulation method. To obtain a prediction of an electrical parameter, it is necessary to have a simulation model in the form of a function of the relationship between a given operating time and the level of simulation impact. The simulation model is obtained with the help of preliminary studies (training experiment) of a training sample of semiconductor devices of the type of interest with the volume of approximately 50 ... 100 copies. The application of the model is reduced to the calculation of the level of simulation impact corresponding to a given operating time. The result of measuring the electrical parameter at the calculated level of the imitation impact in a new specimen of the same type that did not take part in the training experiment should be considered as a prediction of this parameter for a given operating time. An integral part of the preliminary research to obtain a simulation model is the testing of semiconductor devices of the training set for a long operating time, which can be tens of thousands of hours, which necessitates planning and conducting accelerated tests. The article substantiates the conditions for conducting accelerated forced tests in relation to high-power bipolar transistors of the KT872A type. The increased temperature and the reverse voltage applied to the collector junction of the transistors are chosen as factors accelerating the tests. The test acceleration coefficient is calculated relative to the operating mode of the transistors. Based on the results of the accelerated tests for the electrical parameter (collector-emitter saturation voltage), a mathematical model was obtained in the form of a dependence of its average value on the operating time. The presence of this model is necessary to determine the function of recalculating the given operating time of transistors to the value of the simulation impact.

Purpose of the study. To analyze the legal issues, related to the definition of «medical rehabilitation» established in Russian legislation. Materials and methods. A comparative review of the definitions "medical rehabilitation" formulated by World Health Organization and the Russian legislator is made. The main problems of the legal definition of "medical rehabilitation" are studied, including: the problem of distinguishing between "medical rehabilitation" and "treatment". Results. The definition of the term "medical rehabilitation" and terminology used for medical rehabilitation are not consistent in Russian law (legislation still includes such archaic definitions as "rehabilitation treatment" and "rehabilitation medicine"). There is also no unified approach to the question of whether medical rehabilitation is a part of treatment or whether it is an independent stage of medical care. The boundaries between the concepts of "medical rehabilitation" and "treatment" are blurred. Conclusion. The absence of clear boundaries between the definitions of “medical rehabilitation” and “treatment” leads to the risk of violation of licensing requirements by medical organizations, because to determine the list of works (services) to be licensed, it is necessary to correctly determine the specifics of the services provided. The correct classification of a service as medical rehabilitation or medical treatment also effects on the specialization of the involved medical specialists, as well as on the allocated structural units of medical organization. The analysis shows that the main difference between treatment and rehabilitation is the approach. The approach to rehabilitation is broader, it’s primary goal is to return the patient to his previous social status, rather than clinical recovery. At the same time, the main difficulty in distinguishing the mentioned above definitions is related to the fact that the method underlying the medical service is actually licensed, but the same tools and methods can be used both in treatment and medical rehabilitation. Due to these ambiguities, it appears that the current legislation needs to be improved.