The barcode system currently used in the market has a weakness in that identification is only made when the barcode is visible. Unlike the barcode system, the RFID system uses radio frequency technology, allowing more accurate and faster identification of objects than the barcode system. RFID is a method to identify object data using radio frequency technology by attaching a tag to identification objects to be monitored. Active research has been conducted recently, and a lot of attempts have been made to introduce RFID technology in logistics and manufacturing sectors. This paper presents a method to check the accurate number of articles loaded in the freight car using RFID technology. The present research concerns the method in which the RFID reader and middleware is used to accurately and quickly count the number of RFID-tagged articles in real-time. When the tagged articles arrive at the reader area, the information read by the reader is delivered to the middleware. Then, the middleware identifies the number of tags, displaying the results to the user.
Abstract. This study suggested the methods to check a proper replacement time, etc. by managing operation data of IGBT used as switching element of inverter for improving the stability of inverter, which was checked through practical experiment. This study accumulated and recorded data such as operation time of IGBT and temperature of radiator for the use in setting, etc. of proper replacement time by checking the data through an indicator. Methods and systems suggested in this study will be also easily used in various sectors using other electric system and semiconductor switching elements for power.
This study simultaneously realized fast charger and low charger for electric vehicles by designing the driving power supply for the synchronization and interface of the battery system and power converter equipment of electric vehicles. In addition, it allowed the power of the output voltage and current to be supplied at a rate that is freely determined by user's setting regardless of the type of battery and power source, and also the charge and discharge devices for electric vehicles were developed using DSP. Furthermore, multi-step charging and discharging functions according to the changes in C-rate and CC (Constant Current) and CV (Constant Voltage) charging functions were realized in which the system can stably and continuously be operated with efficiency of 95% or above.Through such technological development, it has become possible to freely adjust the input voltage and output voltage according to the load condition through which production cost can be reduced and it is expected that it could be utilized in controller businesses for establishment of emergency power supply in the fields of multiple power supply apparatus of next generation electric vehicles and alternative energy that are leading the future green growth.In the future, this can be utilized in On Board Charger and Off Board Charger of EREV (Electric Range Extender Vehicle) in addition to being possible to be used in development of SMPS for power supply of high capacity power converter. It seems that it can be manufactured as product through design of DC/AC converter for next generation electric vehicles.
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