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A general fault diagnosis method is proposed for modular dc-dc converter system. The magnetic component voltage in each module is chosen as diagnostic signal, which can be easily obtained by adding an auxiliary winding into each magnetic core. Based on the feature of these signals, two logical hardware circuits are designed to achieve fast fault detection for different demands. Fault can be detected...
This study was carried out within the scope of an undergraduate thesis. To produce an Arduino based two dimensional plotter mechanical parts were collected, assembled and targeted mechanism was created. After the integration of the stabilizers into the mechanism that was created and the project framework is revealed in a healthy way, the hardware structure is completed by adding the necessary electronic...
In disaster scenarios or search and rescue applications an efficient, constructive and safe mission needs more than just robotic hardware and control. One major element is the interface between operator and robot. In this contribution, we present the approach of VTB-mediated teleoperation. This comprises (i) using standardized interfaces to integrate existing knowledge and libraries of the robotics...
Mixed Reality aims at combining virtual reality with the user's surrounding real environment in a way that they form one, coherent reality. A coherent visual quality is of utmost importance, expressed in measures of e.g. resolution, framerate, and latency for both the real and the virtual domains. For years, researchers have focused on maximizing the quality of the virtual visualization mimicking...
In this paper, the principle of normalized minimum-sum (NMS) polar decoding process is explored. It is demonstrated that with one properly chosen parameters for NMS algorithm, performances approach to that of the sum-product (SP) algorithm can be achieved. As well, the complexity reduction is realized by calculating a linear function instead of nonlinear function. Simulation results for successive...
Universal Filtered Orthogonal Frequency Division Multiplexing (UF-OFDM) is considered one of the main wave-form candidates to overcome the challenges facing the next generation of mobile communication systems. Due to its spectral properties it can support relaxed synchronization, low-latency communications and flexible time transmission interval. Nevertheless, the available recent literature addresses...
This paper presents area-efficient building blocks for computing fast Fourier transform (FFT): multiplierless processing elements to be used for computing of radix-3 and radix-5 butterflies and reconfigurable processing element supporting mixed radix-2/3/4/5 FFT algorithms. The proposed processing elements are based on Wingorad Fourier transform algorithm. However, multiplication is performed by constant...
In this paper, we show a class of relationships which link Discrete Cosine Transforms (DCT) and Discrete Sine Transforms (DST) of types V, VI, VII and VIII, which have been recently considered for inclusion in the future video coding technology. In particular, the proposed relationships allow to compute the DCT-V and the DCT-VIII as functions of the DCT-VI and the DST-VII respectively, plus simple...
This paper proposes a low complex hardware accelerator algorithmic modification for n-dimensional (nD) FastICA methodology based on Coordinate Rotation Digital Computer (CORDIC) to attain high computation speed. The most complex and time consuming update stage and convergence check required for computation of the nth weight vector are eliminated in the proposed methodology. Using the Gram-Schmidt...
This paper presents the design and prototyping of hardware and software to address the problem of rapid and reliable 3D digitization of very large collections of pinned insects. Using the collection at the Field Museum of Natural History (FMNH) as a use case, a pipeline to ingest the entire collection of 4.5 million specimens in circa 1-2 years imposes a few second limit on average processing time...
To improve the effective utilisation of its supercomputing platforms, the New Zealand eScience Infrastructure (NeSI) offers, in addition to user support and the installation of a comprehensive software stack, a consultancy service to some of its users. Here we present lessons learned from this work and how additional improvements can be made to further enhance productivity of researchers on computing...
We present a set of tools for digital design, integration and verification of mixed-signal Application Specific Integrated Circuits (ASIC) developed within our design team. We have chosen Python for the development of the tools. By drawing on Python's features we have developed tools targeting many steps required across a design flow: a) Complex digital blocks are auto-generated, where Python generates,...
The methodological aspects of building standardized profiles describing the development of a security system that is an integral part of a distributed information system are considered. Functional standardization instruments and the theory of open systems are used.
The current ecosystem of network elements, such as switches and appliances, is largely dominated by devices supplied and sold with a bundled operating system, and software dedicated to manage the device's forwarding hardware, however, these platforms are not open-source and cannot be arbitrarily customized, and there is no cost transparency or flexibility in choosing software different to the bundled...
Virtualization has been widely used as a key technology in cloud computing. Although facilitating the deployment of applications, virtualization introduces huge processing overheads, among which is network I/O virtualization that has become a critical bottleneck of a virtual system. DPDK-vhost is currently the fastest para-virtualized network I/O backend, however it performs poorly when exchanging...
Cameras and other sensors are increasingly deployed for private space monitoring applications such as home monitoring, assisted/enhanced living and child monitoring. Since these cameras capture highly sensitive information and transfer it over public communication infrastructures, security and privacy is a major concern. This work presents a secure camera device along with a secure data delivery and...
A buck converter operated in synchronous — conduction-mode (SCM) can obtain zero-voltage-switching (ZVS) of both switches without any auxiliary components, which is beneficial for high-switching frequency operation. To obtain ZVS of high-side switch, buck converter requires adequate dead-time duration and reverse inductor current. Through the law of conservation of energy, minimum reverse inductor...
The aim of this paper is to present the implementation of an Embedded Real-Time Simulator (ERTS) for Modular Multilevel Converters (MMCs), using low-cost System-on-Chip (SoC) platform. In order to achieve new functionalities such as sensor-less control, monitoring, diagnostic and fault detection, the MMC plant model can be implemented along with the controller. In MMC applications, the implementation...
An extended-duty-ratio (EDR) boost is a unique combination of interleaved, multiphase boost converter and switched capacitor configuration that achieves a high converter gain without increased switching losses as most of the switches experience only fractions of the output voltage depending on the number of phases M. For an M-phase EDR converter with different combinations of the operating modes,...
In recent years, lightweight cryptography has become essential especially for the resource-constrained devices to ensure data protection and security. The selection of suitable cryptographic algorithm which is directly linked to requirements of the system will have dynamically effect on following such metrics like performance of the device, hardware resource cost, the area, speed, efficiency, computation...
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