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Microchips are more and more complex and designed in thick 3 dimensional packages. In order to access and characterize by electron microscopy (SEM and TEM) any detected defect responsible for malfunction of the device, a large quantity of matter needs to be removed without damaging the surrounded area. The available techniques, such as plasma Focused Ion Beam (FIB), allow achieving high quality surfaces...
The paper describes the hardware and software architecture of the developed multi MEMS sensor prototype module, consisting of ARM Cortex M4 STM32F446 microcontroller unit, five 9-axis inertial measurement units MPU9255 (3D accelerometer, 3D gyroscope, 3D magnetometer and temperature sensor) and a BMP280 barometer. The module is also equipped with WiFi wireless interface (Espressif ESP8266 chip). The...
The low cost and small size of MEMS inertial sensors allows their combination into a multi sensor module in order to improve performance. However the different linear accelerations measured on different places on a rotating rigid body have to be considered for the proper fusion of the measurements. The errors in measurement of MEMS inertial sensors include deterministic imperfection, but also random...
The condition of bearings, which are essential components in mechanisms, is crucial to safety. The analysis of the bearing vibration signal, which is always contaminated by certain types of noise, is very important standard for mechanical condition diagnosis of the bearing and mechanical failure phenomenon. In this paper the method of rolling bearing fault detection by statistical analysis of vibration...
There is an increasing demand by an ever-growing number of mobile customers for transfer of rich media content. This requires very high bandwidth which either cannot be provided by the current cellular systems or puts pressure on the wireless networks, affecting customer service quality. This study introduces COARSE ?? a novel cluster-based quality-oriented adaptive radio resource allocation scheme,...
We present a pipelined 32-bit Instruction Set Extension (ISE) for complex valued floating point operations. The ISE was implemented in the NIOS II processor, and the constraint on the number of inputs and outputs of the register bank was overcome by distributing the reads and writes of the instruction over several cycles. The hardware size was reduced by sharing hardware between instructions. The...
Based on the experience from two predecessor projects, a novel architecture for the detection of vulnerable road users (VRU) is developed. It combines communication and localization, following the function principle of a secondary surveillance radar. Challenges are in the accuracy, the scalability, the bandwidth availability and the limited cost and complexity of the devices. This paper describes...
Routing is a key feature for wireless sensor networks, as it extends the geographic range, enables larger installation and provides redundancy to packet transmission. A extensive variety of routing protocols has been designed for wireless sensor networks; however, until today, integration of unidirectional nodes poses a challenge. This paper proposes a routing algorithm to integrate unidirectional...
Based on the experience from two predecessor projects, a novel architecture for the detection of vulnerable road users (VRU) is developed. It combines communication and localization, following the function principles of a secondary radar. Challenges are in the accuracy, the scalability, the bandwidth availability and the limited cost and complexity of the devices. This paper describes the objective...
A novel communication platform is presented, which helps in the monitoring and deployment of distributed wireless networks. Its major part is based on distributed embedded web servers connected to RF-communication heads. The web servers act as distributed communication hubs and exchange data via XML-feeds with web2.0-capable clients. The first implementations are concentrating on the monitoring direction,...
The paper addresses issues associated with modeling and simulation of wireless, mobile, and ad hoc networks. Particular attention is paid to an approach for federating parallel and distributed ad hoc networks simulators. We describe the design, functionality, implementation and performance of MobASim system. It is a Java-based software platform for MANETs simulation performed on parallel computers...
Investigation of effectiveness of different designs of rectifier transformers of tram traction substations has covered issues such as transformer weight, rated power and efficiency and traction line voltage quality. Mathematical models have been created and time and frequency domain analysis has been run as well as power, voltage and current calculations for steady-state conditions. It is pointed...
To transform power grid three-phase ac voltage into tram traction lines dc voltage, multi-phase rectifier-transformer systems are used. Operation of 18- and 24-pulse systems is investigated in this paper, taking into account different supply conditions. Numerical simulations and laboratory tests have been run in order to check which system is the least sensitive to fall in power grid voltage quality.
Short-range wireless networks (SRWN) are becoming more and more popular for sensor and actuator connectivity in industrial, building and home automation. These markets are evolving rapidly with many market players developing technologies and providing products. However, wireless networks still suffer from their lower degree of short-term reliability, and pose additional requirements to the use of...
The core concept of the project, presented in this paper, is to enable the future availability of a modular cooperative system that will bring together sensor and communication technologies permitting to all road users (vehicles, motorcycles, bicycles, pedestrians) to take an active part in the reduction of the number of accidents that involve vulnerable road users. For this, legacy detection technologies,...
Short range wireless networks (SRWN) are an important platform for an increasing number of applications. Apart from the pure communication benefit and other added values, e.g. ease-of-installation, support of mobility, high level of redundancy and reliability, wireless networks can bring in an important additional feature: localization. In many cases, the precision of ranging and localization is based...
Short-range wireless networks (SRWN) are becoming more and more popular for ubiquitous sensor and actuator connectivity in instrumentation and measurement systems. Currently, a significant number of different protocols glut the markets, leaving the system designer and the end user with the burden of choice. In many cases, these protocols cover layer 1 to 7. Some of them are standardized and open protocols,...
Short-range wireless networks (SRWN) are becoming more and more popular for sensor and actuator connectivity in industrial, building and home automation. A significant number of different and incompatible solutions glut the markets, leaving the system designer and the end user with the burden of choice. Instead of those dedicated solutions, it is well possible to run the Internet Protocol directly...
Wireless systems continue to rapidly gain popularity. This is extremely true for data networks in the local and personal area, which are called WLAN and WPAN, respectively. However, most of those systems are working in the license-free industrial scientific medical (ISM) frequency bands, where neither resource planning nor bandwidth allocation can be guaranteed. To date, the most widespread systems...
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