A Software Radio Based Ionosonde Using GNU Radio

ABSTRACT The Canadian Advanced Digital Ionosonde (CADI) is used to study and investigate the structure and motion o f the ionosphere. The main components of CADI are implemented in microcontroller based digital logic. Due to the increased speed and reconfiguration capability of modem FPGAs (Field Programmable Gate Arrays) and ADCs (Analog-Digital Converters), this project is aimed to develop an ionosonde based on an open source radio software platform, GNU Radio, in conjunction with its hardware support, the Universal Software Radio Peripheral (USRP). The lowest cost FPGA, Cyclone EP1C12Q240C8 is selected to control Analog Digital Converter to transmit a HF (High Frequency) signal and to decimate and down convert the signal at the receiver side, which is controlled by a USB controller, and to load the FPGA configuration image through GNU radio platform. To obtain a good range resolution and low noise level, the signal is modulated by a 113-bit Legendre sequence with a preamble packed at front for synchronization. Based on the experimental results, the discussion and conclusion are included

MONOPOL NAD ROBOM S PROSTORNIM ODRŽAVANJEM

This study addresses the effects of monopolistic firms\u27 location and guarantee time limit on pricing for goods requiring high maintenance expenditure, such as elevators, televisions and computers. A spatial maintenance model of two stages within a guaranteed time limit is outlined in this paper. Based on this model, location, maintenance commitment and pricing are all characterized under a monopoly situation. This paper outlines the optimal price and location for the monopolist. The effects of guarantee time limit on price are discussed.Ovaj rad se bavi efektima koje lokacija i vremensko ograničenje garancije u monopolističkim tvrtkama imaju na formiranje cijena robe koja zahtijeva visoke troškove održavanja, kao što su liftovi, televizori i kompjuteri. U ovom radu iznosimo model prostornog održavanja u dva stupnja unutar garantiranog vremenskog ograničenja. Na osnovu ovog modela, lokacija, obveza održavanja i formiranje cijena se sve određuju u situaciji monopola. Rad donosi optimalne cijene i lokacije za monopolistu. Raspravlja se i o učincima vremenskog ograničenja garancije na cijenu

A Novel User Experience Cloud Computing Model for Examining Brand Image Through Virtual Reality

This research paper presents a novel Cloud Computing User Experience (CCUE) approach to reconstructing the brand image of traditional Shanghai cosmetic brands by leveraging virtual reality (VR) technology and user experience (UX) research. Traditional Shanghai cosmetic brands possess rich cultural heritage and unique product offerings, but often face challenges in maintaining relevance in the modern market. The proposed CCUE uses the VR technology to create immersive and interactive experiences that allow consumers to explore and engage with the brand in a virtual environment. The developed CCUE model integrates the Artificial Intelligence (AI) integrated Imperialist Competitive Algorithm (ICA) for the user-machine interaction. With the CCUE a combination of VR simulations, product showcases, and interactive storytelling, users can experience the essence and history of traditional Shanghai cosmetic brands, fostering a deep connection and emotional attachment. Additionally, UX research techniques are employed to gather user feedback and insights, enabling the refinement and optimization of the VR experience. The findings of this CCUE contribute to the field of brand reconstruction and provide practical insights for traditional brands seeking to revitalize their image in a rapidly evolving market