This paper reviews the research trends that link the advanced technical aspects of recommendation systems that are used in various service areas and the business aspects of these services. First, for a reliable analysis of recommendation models for recommendation systems, data mining technology, and related research by application service, more than 135 top-ranking articles and top-tier conferences published in Google Scholar between 2010 and 2021 were collected and reviewed. Based on this, studies on recommendation system models and the technology used in recommendation systems were systematized, and research trends by year were analyzed. In addition, the application service fields where recommendation systems were used were classified, and research on the recommendation system model and recommendation technique used in each field was analyzed. Furthermore, vast amounts of application service-related data used by recommendation systems were collected from 2010 to 2021 without taking the journal ranking into consideration and reviewed along with various recommendation system studies, as well as applied service field industry data. As a result of this study, it was found that the flow and quantitative growth of various detailed studies of recommendation systems interact with the business growth of the actual applied service field. While providing a comprehensive summary of recommendation systems, this study provides insight to many researchers interested in recommendation systems through the analysis of its various technologies and trends in the service field to which recommendation systems are applied.
increased wear on the breaker contacts and arc chutes. Abstract Problems experienced with the use of conventional high speed circuit breakers (HSCB) in rail traction systems is highlighted. The design of a solid state breaker is investigated and after reviewing specifications of various power devices and reports it was decided that the integrated gate controlled thyristor (IGCT) would be the most suitable device for use in a DC circuit breaker as recommended. A novel design employing PWM switching, for shaping the trip curve, has been simulated and a prototype suggested. Matlab/Simulink simulations based on practical traction substation parameters show expected voltages and currents at various points in the circuit. A simplified traction schematic diagram shows the basis of the simulations and an area of typical application. A block schematic diagram highlights the basic electrical design. In conclusion an air-cooled mechanical design of the suggested 4kV 4kA power module is discussed.
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