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Helping people with visual difficulties navigating indoor is challenging. Unlike most of outdoor navigation systems, indoor navigation devices are not able to receive satellite signals. Moreover, indoor navigation usually requires higher positioning accuracy when compared with outdoor applications. In this paper, we propose an indoor positioning system based on AR (augmented reality) markers and computer...
The price per kilowatt-hour of energy delivered by the electric power utility varies as the total power demand supplied to the region it serves throughout the day. To save money and protect power system equipment, it may be necessary to schedule the energy consumed during these periods of high/critical demand and higher pricing. In this project, a number of demand-side management strategies (DSM)...
As embedded systems become increasingly complex, there is a great need to equip engineering students with the knowledge of advanced embedded software development techniques so as to improve their efficiency in software development and programming. This paper presents our experiences of introducing the model-based design (MBD) methodology to two computer engineering related undergraduate courses: Programming...
This paper introduce into the International Simulation Science Semester concept from learning research to actually doing research at Clausthal University of Technology (TUC). It gives an overview on the topics and the pedagogical method behind this transformative approach. Moreover, it introduce in the international student team research project work and their results.
This paper proposes a novel estimator for active and reactive power control of single-phase power electronic applications. The proposed estimator includes: 1) an instantaneous grid power regression model; 2) a fast upper-triangular and diagonal recursive least square (FUDRLS) algorithm for parameter identification of the regression model; and 3) a new self-tuning variable forgetting factor included...
With the increasing exposure of critical infrastructures to external factors, critical infrastructure protection gained attention within security research. To develop protection methods the effect of external factors on critical infrastructures has to be known. In this paper we present an event-based, dynamic modeling approach using power flow analysis and network flow analysis to simulate this effect...
In many refrigeration and air-conditioning systems, the automatic controller in electronic expansion valves have been employed as a component responsible for controlling the valve opening so that the superheat at the outlet of the evaporator remains within the desired limits. In most of these controllers, the control parameters are tuned once for a certain operating point and remain unaltered even...
In this paper, a closed-form physics-based surface potential approach is proposed to derive a compact model for current in high-frequency and high-power LDMOS transistors. For this purpose, we have modeled the drift region with three variable resistors. Effects of velocity saturation in the channel as well as the quasi-saturation due to the existence of the N-Drift region have been taken into account...
In this paper, we introduce the possible texturing methods and their effects on the performance of multicrystalline silicon solar cells. A 2-D process and device simulator is used for this purpose and the resultant efficiency increase is studied. The optimized texturing angel is deducted by theoretical calculations of ray tracing. Theoretical calculations show that the best texturing angle to have...
Computational methods of metabolic pathway modeling permit a better understanding of health, disease, and the basic biological principles of regulation and metabolism; yet, model development and solving sets of ordinary differential equations is a computationally intensive process. Employing the queueing theory, an approach commonly employed to evaluate telecommunication networks, reduces the computational...
In this paper, a new set of algorithms has been developed to detect low charge fault for single compressor non-critically charged refrigeration system for both frozen and perishable goods. A mix of field units' data and experimental data were used to build the detection algorithms. Multiple detection algorithms were devised based on the operation modes. The system operates in multiple distinctive...
This paper will discuss an embedded system for Structural Health Monitoring (SHM). The system designed is a working proof of concept prototype made for an SHM system using Piezoelectronic transducers as the sensors. The system uses pulse-echo and pitch-catch techniques to find the location of damage and the width of the damage. If damage is present, the system will generate an email and send to the...
In today's energy grid there are very few options to handle the severe energy swings of renewable energy sources. A Synchronverter is designed to allow an asynchronous energy source like wind mills and solar panels to appear as a synchronous energy sources. To this day, the designs have been analog with large size and large assortment of components. This paper proposes a digital design that matches...
The objective of this paper is to find a way for simulating the channel in molecular communication. In molecular communication, transporting the data happens through propagation of the micro-scale particles in a fluid or gaseous medium. Molecules move through the channel due to diffusion and thus transfers the data between receiver and transmitter. In order to model this type of communication channel,...
This paper presents a comparative study of continuous time and discrete time system identification approaches for estimating the parameters of an electrical equivalent circuit model of a li-ion battery. Three such methods are studied here. While the first two represent examples of direct continuous time approaches, the third one represents an indirect discrete time approach. Based on both simulated...
In this paper, a new swarm intelligence based algorithm called Grey Wolf Optimizer (GWO), mimicking the social hierarchy and hunting behavior of grey wolves, is used to optimally schedule the operation of Energy Storage Unit (ESU) in smart homes. The aim is to reduce the cost of power consumption and balance the load on the power grid. This is achieved by drawing the power from the grid when the price...
As more and more distributed generators with intermittent characteristics are applied in microgrids, centralized control scheme encounters great challenges. In this paper, a fully distributed cooperative control scheme for Virtual Synchronous Generator based microgrid is proposed. Specifically, Virtual Synchronous Generator algorithm is developed as the primary controller of microgrid such that inverter...
This paper investigates the low-voltage ride-through (LVRT) performance of a proposed sensorless vector control method for the doubly-fed induction generators (DFIGs) under power grid voltage sags. The sliding-mode observer (SMO) is used to estimate the rotor position and speed information for the vector control of the DFIG. The performance of the SMO is compared with the model reference adaptive...
The reliability of the treadmill belt speed using a feedback-controlled treadmill algorithm was analyzed in this study. Using biomechanical factors of the participant's walking behavior, an estimated walking speed was calculated and used to adjust the speed of the treadmill. Our proposed algorithm expands on the current hypotheses of feedback-controlled treadmill algorithms and is presented below...
Communication networks are large distributed systems designed to send messages from one location to another. Messages are generated by a source and transmitted through a server to their destinations. Servers are connected by the transmission links through which the data flows, and each server has a certain queue capacity. When the number of incoming messages exceeds the capacity of the server or the...
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