Browsing by Author "Department of Electrical and Computer Engineering, School of Engineering and Technology"

Now showing 1 - 10 of 18
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    Asset Allocation with Swarm/Human Blended Intelligence
    (IEEE, 2016-10) Christopher, Lauren; Boler, William; Wieczorek, Calvin; Crespo, Jonah; Witcher, Paul; Hawkins, Scot A.; Stewart, James; Department of Electrical and Computer Engineering, School of Engineering and Technology
    PSO has been used to demonstrate the near-real-time optimization of frequency allocations and spatial positions for receiver assets in highly complex Electronic Warfare (EW) environments. The PSO algorithm computes optimal or near-optimal solutions so rapidly that multiple assets can be exploited in real-time and re-optimized on the fly as the situation changes. The allocation of assets in 3D space requires a blend of human intelligence and computational optimization. This paper advances the research on the tough problem of how humans interface to the swarm for directing the solution. The human intelligence places new pheromone-inspired spheres of influence to direct the final solution. The swarm can then react to the new input from the human intelligence. Our results indicate that this method can maintain the speed goal of less than 1 second, even with multiple spheres of pheromone influence in the solution space.
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    Attached Learning Model for First Digital System Design Course in ECE Program
    (American Society for Engineering Education, 2016-06) Shayesteh, Seemein; Rizkalla, Maher E.; Christopher, Lauren; Miled, Zina Ben; Department of Electrical and Computer Engineering, School of Engineering and Technology
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    Certainty and Critical Speed for Decision Making in Tests of Pedestrian Automatic Emergency Braking Systems
    (IEEE, 2016-09) Rosado, Alberto López; Chien, Stanley; Li, Lingxi; Yi, Qiang; Chen, Yaobin; Sherony, Rini; Department of Electrical and Computer Engineering, School of Engineering and Technology
    This paper starts with depicting the test series carried out by the Transportation Active Safety Institute, with two cars equipped with pedestrian automatic emergency braking (AEB) systems. Then, an AEB analytical model that allows the prediction of the crash speed, stopping distance, and stopping time with a high degree of accuracy is presented. The model has been validated with the test results and can be used for real-time application due to its simplicity. The concept of the active safety margin is introduced and expressed in terms of deceleration, time, and distance in the model. This margin is a criterion that can be used either in the design phase of pedestrian AEB for real-time decision making or as a characteristic indicator in test procedures. Finally, the decision making is completed with the analysis of the behavior of the pedestrian lateral movement and the calculation of the certainty of finding the pedestrian into the crash zone. This model of certainty completes the analysis of decision making and leads to the introduction of the new concept of “critical speed for decision making.” All major variables influencing the performance of pedestrian AEB have been modeled. A proposal of certainty scale in this kind of tests and a set of recommendations are given to improve the efficiency and accuracy of evaluation of pedestrian AEB systems.
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    Design of a Highly Efficient Microinverter
    (IEEE, 2016-06) Nezamuddin, Omar; Crespo, Jonah; dos Santos, Euzeli C., Jr.; Department of Electrical and Computer Engineering, School of Engineering and Technology
    This paper proposes a grid-tied single-phase photovoltaic (PV) microinverter consisting of five-level four-switch (5L-4S) DC-AC converter fed by an isolated fly-back DC-DC converter. The microinverter utilizes a split-coil inductor to produce five levels of pulse width modulation (PWM) compared to the three levels of PWM using conventional four-switch topologies. These implementations reduce losses by up to 39% compared to a conventional topology. The results show that the proposed design improves performance throughout the switching frequency spectra with various loads. The theoretical expectations are validated with simulation and experimental results.
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    Development of Bicycle Surrogate for Bicyclist Pre-Collision System Evaluation
    (SAE, 2016-04) Yi, Qiang; Chien, Stanley; Brink, Jason; Niu, Wensen; Li, Lingxi; Chen, Yaobin; Chen, Chi-Chen; Sherony, Rini; Takahashi, Hiroyuki; Department of Electrical and Computer Engineering, School of Engineering and Technology
    As part of active safety systems for reducing bicyclist fatalities and injuries, Bicyclist Pre-Collision System (BPCS), also known as Bicyclist Autonomous Emergency Braking System, is being studied currently by several vehicles manufactures. This paper describes the development of a surrogate bicyclist which includes a surrogate bicycle and a surrogate bicycle rider to support the development and evaluation of BPCS. The surrogate bicycle is designed to represent the visual and radar characteristics of real bicyclists in the United States. The size of bicycle surrogate mimics the 26 inch adult bicycle, which is the most popular adult bicycle sold in the US. The radar cross section (RCS) of the surrogate bicycle is designed based on RCS measurement of the real adult sized bicycles. The surrogate bicycle is constructed with detachable components with shatter resistant material to prevent structural damage during a collision, and matches the look and RCS of a real 26 inch mountain bicycle from all 360 degree angles. The surrogate bicycle rider is a 168 cm tall adult with CNC machined realistic body shape. The skin of the surrogate bicycle rider has the RCS of a real human skin. Combined skin with realistic body shape, the surrogate bicyclist has the RCS matching to that of a same sized real human from 360 degree angles in the view of 77GHz automotive radar. The surrogate bicyclist has articulated leg motion which is important for micro Doppler sensing and can be supported on a sled or a mobile carrier. It can be moved at a speed of 20 mph and can be collided by vehicles from any direction and be reassembled in less than 5 minutes.
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    Doubly Self-Aligned DMOSFET in SiC for Microgravity Manufacture
    (2016-05) Schubert, Peter J.; Department of Electrical and Computer Engineering, School of Engineering and Technology
    The need exists for power electronics capable of operation at high temperatures in a high radiation environment, such as in deep space. There is a rationale for fabricating such devices from materials already in situ, such as building very large phased array antennas. Device manufacture on human-staffed microgravity platform presents a challenge to the tight lithographic alignment required for traditional fabrication methods. Presented here for the first time is a process sequence to produce high-mobility DMOS FETs with no masking steps requiring critical alignment, yet yielding channel lengths of 0.15 micron. The fabrication process is further designed to utilize and recycle materials expected to be available on certain classes of asteroids and within extinct comets, with minimal need for reagents from earth. One application is manufacture of the tens of millions of MMIC power amplifiers required for wireless power transfer to terrestrial customers from solar power satellites in geostationary earth orbit.
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    FlexiWi-Fi Security Manager Using Freescale embedded System
    (IEEE, 2015-12) Kamoona, Mustafa; El-Sharkawy, Mohamed; Department of Electrical and Computer Engineering, School of Engineering and Technology
    Among the current Wi-Fi two security models (Enterprise and Personal), while the Enterprise model (802.1X) offers an effective framework for authenticating and controlling the user traffic to a protected network, the Personal model (802.11) offers the cheapest and the easiest to setup solution. However, the drawback of the personal model implementation is that all access points and client radio NIC on the wireless LAN should use the same encryption key. A major underlying problem of the 802.11 standard is that the pre-shared keys are cumbersome to change. So if those keys are not updated frequently, unauthorized users with some resources and within a short timeframe can crack the key and breach the network security. The purpose of this paper is to propose and implement an effective method for the system administrator to manage the users connected to a router, update the keys and further distribute them for the trusted clients using the Freescale embedded system, Infrared and Bluetooth modules.
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    Harmonic Analysis and Practical Implementation of a Two-Phase Microgrid System
    (IEEE, 2015-03) Alibeik, Maryam; dos Santos, Euzeli C., Jr.; Yang, Y.; Wang, X.; Blaabjerg, F.; Department of Electrical and Computer Engineering, School of Engineering and Technology
    This paper analyzes the harmonic contents of a non-linear load connected to a two-phase microgrid system. Although having the same harmonic content as the single-phase power system when supplying a non-linear load under balanced conditions, the two-phase microgrid system presents the following advantages: 1) constant power through the power line at the balanced condition; 2) two voltages i.e., line-to-line and phase voltages, available by using a three wire system; 3) optimized voltage utilization compared to a three-phase system; and 4) a direct connection of both symmetrical two-phase and single-phase electrical machines. This paper presents an approach for analyzing the harmonics of a two-phase non-linear load in a balanced and unbalanced cases. The mathematical model for the symmetrical component of an unbalanced two-phase system has also been presented in this paper. Finally, a practical implementation of the two-phase system has been performed, where different types of loads are connected to the two-phase power line to test the voltage control performance.
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    Human Fitness Functions
    (IEEE, 2015-09) Christopher, Lauren; Reynolds, Joshua; Crespo, Jonah; Eberhart, Russ; Shaffer, Patrick; Department of Electrical and Computer Engineering, School of Engineering and Technology
    "Be careful what you measure" is a management adage that applies to Particle Swarm Optimization (PSO) and is especially important with Humans in the Swarm. PSO has been applied to the autonomous asset management problem in electronic warfare where the speed provides fast optimization of frequency allocations for receivers and jammers in highly complex and dynamic environments in our previous work. In this optimization problem, one key part of the fitness is adapted by the human: the 2D (and future 3D) battlefield environment. This paper explores the use of the human in the fitness function, adapting to the battlefield conditions as the PSO is acting. Two aspects of dynamic human influence will be discussed: Simple geometric zones and pheromone influenced zones.
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    Infrared Reflectivity of Pedestrian Mannequin for Autonomous Emergency Braking Testing
    (IEEE, 2016-11) Haran, Terence; Chien, Stanley; Department of Electrical and Computer Engineering, School of Engineering and Technology
    In order to be able to evaluate the performances of different Autonomous Emergency Braking (AEB) systems for pedestrian crash avoidance and mitigation, a standard surrogate pedestrian mannequin needs to be developed. One of the requirements for pedestrian mannequin is to ensure it “looks” like a real representative pedestrian to each of the sensor modalities used in AEB systems. The purpose of this paper is to generate the recommended IR reflectance specifications for the standard surrogate pedestrian mannequin based on the collected data from various sources and the experiments