- 标题
- 摘要
- 关键词
- 实验方案
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Low Complexity Algorithm for Range-Point Migration-Based Human Body Imaging for Multistatic UWB Radars
摘要： High-resolution, short-range sensors that can be applied in optically challenging environments (e.g., in the presence of clouds, fog, and/or dark smog) are in high demand for various applications. Ultrawideband radar is a promising sensor that is suitable for short-range surveillance or watching sensors. Range-point migration (RPM) has been recently established as a promising imaging approach to achieve accurate and real-time 3-D imaging. However, when objects with many scattering points are dealt with, such as a human body, RPM suffers from high computational costs. In this letter, we propose an algorithm with a lower complexity for an RPM-based 3-D imaging method by introducing a sampling-based scattering center extraction with a simpli?ed evaluation function, in which an ef?cient sample pattern is provided by a golden ratio. The results from a ?nite-difference time-domain-based numerical test, which introduces a realistic human body object, demonstrate that our proposed method remarkably reduces the computational cost without sacri?cing the reconstruction accuracy.
关键词： ultrawideband (UWB) radar,short-range sensor,multistatic observation model,3-D imaging,range-point migration (RPM)
更新于2025-09-23 15:21:21
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Methylammonium Polyiodides in Perovskite Photovoltaics: From Fundamentals to Applications
摘要： Discovered in 2017, methylammonium polyiodides were proposed as a facile precursor for synthesis of hybrid perovskites by means of their interaction with metallic lead, which initiated further active exploration of their potential applications. Investigation of their unusual properties such as liquid state, unprecedented phase diversity and high reactivity revealed that methylammonium polyiodides are the first representatives of a new class of compounds—reactive polyhalide melts (RPM). In this review, we summarize the reported data on the unique properties of these compounds, discuss their potential for fabrication of hybrid perovskite films and describe the role of polyhalides in degradation of perovskite solar cells.
关键词： perovskites,methylammonium polyiodides,hybrid perovskites,perovskite solar cells,RPM,reactive polyiodide melts
更新于2025-09-23 15:21:01
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[IEEE 2018 IEEE International Conference on Electro/Information Technology (EIT) - Rochester, MI (2018.5.3-2018.5.5)] 2018 IEEE International Conference on Electro/Information Technology (EIT) - DC Motor Cruise Control by Interfacing IR Sensor Tachometer and SIMULINK, Regardless Motor Specifications and Change of Shaft Load
摘要： DC motor could be controlled different ways with different approaches. One of the problems has been identifying internal specifications of DC motor such as Torque constant, back-emf constant, viscous friction constant, internal resistance and inductance. These parameters are needed for modelling the system of a DC motor. Unfortunately, those are not specified in most commercially manufactured DC motor’s data sheet. Most popular controlling methods available are PID controller, Adaptive controller or intelligent controller in some cases. Proposed experiment disregards all these problems and methods mentioned above to build a very simple, effective and cheap cruise controller of a DC motor. This experiment divided into two key parts; first phase focuses on a simple IR sensor tachometer designing in microcontroller (LPC1768 ARM) platform which performs DAC (digital to analog conversion) in essence. Tachometer’s RPM reading gives the feedback into controller function to compare against the desired RPM set by the user until they align on the same line. A SIMULINK diagram has been implemented in ARDUINO Mega for the cruise control which contains controller function. Results analyzed for different RPM and concludes the system’s high efficiency for RPM range between 300-1200.
关键词： RPM- revolution per minute,EMF- Electro motive force,DAC-Digital to analog converter,IRS- Infrared reflective sensor
更新于2025-09-10 09:29:36