This paper proposes methodologies and techniques for multiblock navigation of an indoor localization system with active beacon sensors. As service robots and ubiquitous technology have evolved, there is an increasing need for autonomous indoor navigation of mobile robots. In a large number of indoor localization schemes, the absolute position estimation method, relying on navigation beacons or landmarks, has been widely used due to its low cost and high accuracy. However, few of these schemes have managed to expand the applications for use in complicated workspaces involving many rooms or blocks that cover a wide region, such as airports and stations. Since the precise and safe navigation of mobile robots in complicated workspaces is vital for the ubiquitous technology, it is necessary to develop a multi-block navigation scheme. This new design of an indoor localization system includes ultrasonic attenuation compensation, dilution of both the precision analysis and fault detection, and an isolation algorithm using redundant measurements. These ideas are implemented on actual mobile robot platforms and beacon sensors, and experimental results are presented to test and demonstrate the new methods.
Building-integrated photovoltaic (BIPV) systems are gaining global popularity as a means to reduce carbon emissions. The optimal implementation of BIPV requires consideration of various physical factors. One such factor is the temperature rise of the photovoltaic module, which can have detrimental effects, such as decreased power generation and thermal damage. The temperature rise is influenced not only by weather conditions, but also by the finishing characteristics of the building envelope, including the surrounding finishing conditions and bonding materials. In this study, the thermal conditions of BIPV systems were assessed by analyzing the rear air and back surface temperatures under different rear natural ventilation conditions. Experiments were conducted using steel-plate-integrated solar modules and steel plates, and back surface and air temperature data were collected from these simulated systems. The experimental conditions were categorized based on whether the ventilation control vents located at the upper and lower ends of the system were open or closed. The experimental results showed that the average back-surface temperature of the solar module was approximately 11°C higher during high solar irradiance conditions (800 W/m 2 ) in summer, when both the upper and lower ventilation control vents were shut off, compared to the conditions in which both vents were open. These findings confirm the need for back-ventilation adjustments when implementing BIPV systems.Keywords: 신•재생 에너지(New and renewable energy), 건물일체형 태양광 시스템(Building integrated photovoltaic), 강판 일체형 태양광 모듈(Steel plate integrated photovoltaic module), 후면 조건(Rear air channel condition)한국태양에너지학회 논문집
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