A5022515380- Advanced Chemical Physics Studies
- Robotics and Sensor-Based Localization
- Particle Detector Development and Performance
- Guidance and Control Systems
- CCD and CMOS Imaging Sensors
- Adaptive Control of Nonlinear Systems
- Control Systems and Identification
- Robotic Path Planning Algorithms
- Mobile Ad Hoc Networks
- Advanced Control Systems Optimization
- Radiation Detection and Scintillator Technologies
- Target Tracking and Data Fusion in Sensor Networks
- Aerospace and Aviation Technology
- Infrared Target Detection Methodologies
- Catalysis and Oxidation Reactions
- Customer churn and segmentation
- Opportunistic and Delay-Tolerant Networks
- Vehicular Ad Hoc Networks (VANETs)
- Atomic and Molecular Physics
- Inertial Sensor and Navigation
- Real-time simulation and control systems
- Fault Detection and Control Systems
- Robotic Mechanisms and Dynamics
- Spacecraft Dynamics and Control
- Aerospace Engineering and Control Systems
Novartis (United States)
2024
Georgia Institute of Technology
2002-2021
Georgia Southern University
2017-2018
University of Utah
2015-2016
Milbank Memorial Fund
2014
Rutherford Appleton Laboratory
2008-2009
University of Oxford
2007
Institute of Electrical and Electronics Engineers
2006
Competition in the wireless telecommunications industry is fierce. To maintain profitability, carriers must control churn, which loss of subscribers who switch from one carrier to another.We explore techniques statistical machine learning predict churn and, based on these predictions, determine what incentives should be offered improve retention and maximize profitability carrier. The include logit regression, decision trees, neural networks, boosting. Our experiments are a database nearly...
The abrupt onset of predissociation in the congested electronic spectra jet-cooled VC, VN, and VS has been observed using resonant two-photon ionization spectroscopy. It is argued that because high density states these molecules, threshold occurs at thermochemical for production separated atoms their ground states. As a result, measured represents bond dissociation energy. Using this method, energies D0(V C) = 4.1086(25) eV, N) 4.9968(20) S) 4.5353(25) eV are obtained. From values,...
Predissociation thresholds have been observed in the resonant two-photon ionization spectra of TiSi, ZrSi, HfSi, VSi, NbSi, and TaSi. It is argued that because high density electronic states at ground separated atom limit these molecules, predissociation threshold each case corresponds to thermochemical bond dissociation energy. The resulting energies are D0(TiSi) = 2.201(3) eV, D0(ZrSi) 2.950(3) D0(HfSi) 2.871(3) D0(VSi) 2.234(3) D0(NbSi) 3.080(3) D0(TaSi) 2.999(3) eV. enthalpies formation...
This paper describes a vision-based relative motion estimator in the formation ∞ight of two unmanned aerial vehicles (UAV’s). The navigation follower aircraft to target (or leader) is performed by vision-only information from single camera flxed aircraft. images projected on videocamera plane are captured and processed into vision information. for this work composed three angles: an azimuth angle, elevation subtended angle. Using measurement, estimates position, velocity, size, acceleration...
Predissociation thresholds have been observed in the resonant two-photon ionization spectra of TiSe, ZrSe, HfSe, VSe, NbSe, and TaSe. It is argued that sharp onset predissociation corresponds to bond dissociation energy each these molecules due their high density states as ground separated atom limit approached. The energies obtained are D0(TiSe) = 3.998(6) eV, D0(ZrSe) 4.902(3) D0(HfSe) 5.154(4) D0(VSe) 3.884(3) D0(NbSe) 4.834(3) D0(TaSe) 4.705(3) eV. Using energies, enthalpies formation...
For reusable launch vehicles, it is common to separate the guidance and flight control problem into an outer loop inner loop. The uses aerodynamic propulsive controls achieve a commanded attitude. attitude commands are generated by This variables desired positions/velocities. paper describes improvements evaluation results for combined inner-outer adaptive architecture vehicles. includes online training of neural network correct force moment model errors. result system that can respond large...
Landing an aircraft in a remote landing zone autonomously presents several challenges. Firstly, the exact location, orientation, and elevation of is not always known; secondly, accuracy aircrafts navigation solution su‐cient for this type precision maneuver. This paper explores method estimating relative position attitude to marked area using only images from single camera. The corners are with red beacons. these beacons camera image extracted simple e‐cient processing techniques. Then...
Unmanned aerial vehicles (UAVs), and unmanned systems (UAS) as such in general, need wireless networks order to communicate. UAS are very flexible hence allow for a wide range of missions by means utilizing dierent UAVs according the mission requirements. Each these also poses special needs requirements on communication network. Especially, scenarios calling UAV swarms increase complexity call specialized solutions. This work focuses specialties describes selection process, adaptation...
This paper describes modeling, simulation, algorithm, and flight validation activities done to explore the feasibility highlight issues with precision cargo delivery from an unmanned helicopter onto or off-of a moving platform. The challenge is precisely control slung load under high enough bandwidth allow for rendezvous stochastically accelerating ground target. To aide this effort, models are developed of
Identifying object location and orientation are important tasks in target tracking obstacle avoidance. This paper proposes an algorithm for identifying location, size, without any prior knowledge based on machine vision. The uses measurements taken from a video camera to update estimates of the target. Two forms Kalman filter were compared as methods estimating targets’ states. first, extended (EKF), Taylor series expansion about current state estimate nonlinear measurement update. second,...
Optical spectra of the supersonically cooled NiCCH radical have been recorded in 530–650 nm region using resonant two-photon ionisation method, and five observed bands rotationally resolved. The resolved studies demonstrate that ground state is symmetry, corresponding to a 3d9 configuration on nickel atom, with hole located 3dδ orbital. Most are assigned electronic transition, which shows progression Ni–C stretching mode, ν3. In addition, single excitations modes ν2 (C≡C stretch), ν4 (C≡C–H...
The discovery of interstellar anions has been a milestone in astrochemistry. In the search for new anions, CP− and C2P− are viable candidates since their corresponding neutrals have already detected astronomically. However, scarce data exist these negatively charged species. Here we report electron affinities CP C2P along with vibrational frequencies using high-resolution photoelectron imaging. These results previous spectroscopic neutral species used further to benchmark very accurate...
We discuss an integer linear programming modeling system based on relational algebra. In this system, all related activities, such as model formulation, instantiation, and instance management, are done using simple operations selection, projection, predicated join.
The optical spectrum of diatomic OsSi has been investigated for the first time, with transitions observed in range from 15 212 to 18 634 cm(-1) (657-536 nm). Two electronic band systems have identified along a number unclassified bands. Nine bands at rotational resolution, allowing ground state be as X(3)Σ0(+) (-), arising 1σ(2)1π(4)2σ(2)3σ(2)1δ(2) configuration. (-) is characterized by re = 2.1207(27) Å and ΔG1/2″ 516.315(4) most abundant isotopologue, (192)Os(28)Si (38.63%). A1 excited...
This paper presents the preliminary work done of a flight validation process for several existing and under-development metrics-driven adaptive control methods. is key element in larger NASA Intelligent Resilient Aircraft (IRAC) program, which seeks to increase overall aircraft safety through dramatic improvements stability, maneuverability, probability safe landing under adverse conditions - including damage. project enables innovations approaches be validated tests that include simulated...
Modern flight control systems are expected to perform beyond their conventional envelopes and exhibit robustness adaptability uncertain environments failures. Adaptive has been shown improve the performance of a system in presence uncertainties Recently, new adaptive design named DF-MRAC developed which offers possibility improved adaptation smoother error transient characteristics compared MRAC designs. In this paper test results using small twin engine aircraft with is evaluated
This paper studies a stochastically optimized guidance design for monocular vision-based control applications unmanned aerial vehicles. First, an extended Kalman fllter is applied to estimate the 3-D relative state of target from 2-D measurement. Since estimation performance signiflcantly depends on vehicle’s motion target, this work aims derive optimal law which improves accuracy while achieving mission. formulates stochastic optimization problem by minimizing expected cost including error...