UMBC Computer Science and Electrical Engineering Department

Permanent URI for this collectionhttp://hdl.handle.net/11603/50

The Computer Science and Electrical Engineering Department aims to maintain a program of excellence in teaching, research, and service for all of its programs. At the undergraduate level, we will provide students with a firm foundation of both the theory and practice of Computer Science and Computer Engineering. Our curricula also give students the social, ethical, and liberal education needed to make significant contributions to society. Students receiving a bachelor’s degree are ready to enter the work force as productive computer scientists or computer engineers, or to continue their education at the graduate or professional level.

At the graduate level, we are committed to developing the research and professional capabilities of students in Computer Science, Computer Engineering, Electrical Engineering and Cybersecurity. Our programs provide a deeper mastery of the basics of these fields, as well as opportunities to collaborate on leading-edge research with our faculty. Our faculty are engaged in both practical and theoretical research, often in partnership with government agencies, private industry and non-governmental organizations. The aim of this research is to advance knowledge within our disciplines and also to contribute to solving problems faced by our society.

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Now showing 1 - 20 of 2550

Expanding Polar Science Access and Understanding with Immersive XR
(APL Webinars and Events, 2024-08-21) Tack, Naomi; Holschuh, Nicholas; Sharma, Sharad; Williams, Rebecca M.; Engel, Don
We have developed several immersive fence diagrams which allow scientists to be surrounded by the glacier. Our work focuses on intuitive user interaction, similar to mobile map application controls, and hardware independence allowing greater access among the community. Users are able to navigate through physical motion, panning and adjusting scale allowing many areas of the glacier to be observed in relation to each other. We plan to add tools to allow annotations of the ice sheet layer to be made and visualized in order to trace layers throughout glaciers.
Theoretical Investigation of Optical Fiber-Length-Dependent Phase Noise in Opto-Electronic Oscillators - The effects of optical propagation on RF signal and noise
(2011-05-05) Docherty, Andrew; Okusaga, Olukayode; Menyuk, Curtis; Zhou, Weimin; Carter, Gary M.
Opto-electronic oscillators (OEO) operate with low phasenoise due to the large delay and low loss of optical fibers.
Photogrammetry and VR for Comparing 2D and Immersive Linguistic Data Collection (Student Abstract)
(AAAI, 2023-06-26) Rubinstein, Jacob; Matuszek, Cynthia; Engel, Don
The overarching goal of this work is to enable the collection of language describing a wide variety of objects viewed in virtual reality. We aim to create full 3D models from a small number of ‘keyframe’ images of objects found in the publicly available Grounded Language Dataset (GoLD) using photogrammetry. We will then collect linguistic descriptions by placing our models in virtual reality and having volunteers describe them. To evaluate the impact of virtual reality immersion on linguistic descriptions of the objects, we intend to apply contrastive learning to perform grounded language learning, then compare the descriptions collected from images (in GoLD) versus our models.
Visualizing Earth Science Climate Model and Digital Twin data in XR
(AGU, 2024-12-10) Grubb, Thomas; Kullman, Kaur; Clune, Thomas; Lait, Leslie R.; Zwicker, Matthias; Guimond, Stephen; West, Ruth; Eastman, Roger; Engel, Don; Ames, Troy; Hosler, Jeffrey; Hegde, Srinidhi
Earth Science benefits from a vast treasure trove of in-situ and remotely sensed observational data as well as complex modeling products. Earth Science Digital Twins (ESDT) are an emerging capability that integrates and synthesizes this and other data to help with understanding and forecasting the complex interconnections among Earth systems
STGen: A Novel Lightweight IoT Testbed for Generating Sensor Traffic for the Experimentation of IoT Protocol and its Application in Hybrid Network
(2025-04-24) Islam, Hasan MA; Nath, S.; Rahman, M.; Shahriar, N.; Khan, M. K. M.; Islam, Riadul
A Wireless Sensor Network (WSN) is a network that does not rely on a fixed infrastructure and consists of numerous sensors, such as temperature, humidity, GPS, and cameras, equipped with onboard processors that manage and monitor the environment in a specific area. As a result, building a real sensor network testbed for verifying, validating, or experimenting with a newly designed protocol presents considerable challenges in adapting a laboratory scenario due to the significant financial and logistical barriers, such as the need for specialized hardware and large-scale deployments. Additionally, WSN suffers from severe constraints such as restricted power supply, short communication range, limited bandwidth availability, and restricted memory storage. Addressing these challenges, this work presents a flexible testbed solution named STGen that enables researchers to experiment with IoT protocols in a hybrid environment that emulates WSN implementations with the physical Internet through a dedicated physical server named STGen core, which receives sensor traffic and processes it for further actions. The STGen testbed is lightweight in memory usage and easy to deploy. Most importantly, STGen supports large-scale distributed systems, facilitates experimentation with IoT protocols, and enables integration with back-end services for big data analytics and statistical insights. The key feature of STGen is the integration of real-world IoT protocols and their applications with WSN. Its modular and lightweight design makes STGen efficient and enables it to outperform other popular testbeds, such as Gotham and GothX, reducing memory usage by 89\%. While GothX takes approximately 26 minutes to establish a large topology with four VM nodes and 498 Docker nodes, STGen requires only 1.645 seconds to initialize the platform with 500 sensor nodes.
Popular AIs head-to-head: OpenAI beats DeepSeek on sentence-level reasoning
(The Conversation, 2025-04-17) Gaur, Manas
Large language model AIs can ingest long documents and answer questions about them, but a key question is how well they ‘understand’ individual sentences in the documents.
Modeling of soliton-dragging logic gates with gain
(Optica, 1993-10-03) Saxena, S.; Wai, P. K. A.; Chen, Chien-Jen; Menyuk, Curtis
Soliton dragging logic gates have been proposed to perform ultrafast switching in an optical network using time shift keying.
Two Dimensional Richardson Extrapolation for Optical Waveguide Problems
(Optica, 1994-02-17) Chinni, V. R.; Menyuk, Curtis; Wai, P. K. A.
Light propagation in optical waveguides is studied in the paraxial approximation using Richardson extrapolation. Highly accurate solutions have been efficiently obtained using Richardson extrapolation and the mid-step Euler finite different method [1]. In Richardson extrapolation, numerical solutions with lesser accuracy are extrapolated to zero step size to obtain a more accurate solution. Richardson extrapolation is a simple algebraic procedure that can be used with any numerical scheme to improve the accuracy of the solution [2]. Richardson extrapolation stabilizes the unstable mid-step Euler method and also allows one to use Hadley’s transparent boundary conditions. When solving the paraxial wave equation using finite difference methods, both the propagation and transverse dimensions are discretized. Discretization errors arising from both the transverse and the propagation dimension have to be minimized in order to obtain an accurate solution. We solve this problem by applying Richardson extrapolation in both directions.
Accurate Solution of the Paraxial Wave Equation Using Richardson Extrapolation
(Optica, 1993-03-22) Chinni, V. R.; Menyuk, Curtis; Wai, P. K. A.
It is useful to have highly accurate, yet rapid schemes for solving the paraxial wave equation in order to be able to separate inaccuracies inherent in the numerical methods from inaccuracies due to the paraxial wave approximation itself.
Small-Scale Magnetic Fluctuations Inside the Macrotor Tokamak
(APS, 1979-05-07) Zweben, S. J.; Menyuk, Curtis; Taylor, R. J.
Magnetic pickup loops inserted into the Macrotor tokamak have shown a broad spectrum of oscillation in 𝐵ᵣ and 𝐵ₚ up to f≈100 kHz. The high-frequency 𝐵ᵣ have short radial and poloidal correlation lengths L < 5, in contrast with the usual Mirnov oscillations with 𝑓≈7 kHz and 𝐿≫5 cm. The observed magnitude 𝛴⁢|𝐵ᵣ| / 𝐵ₜ >10⁻⁵, where the summation extends over all f>30 kHz, is in the range in which such radial magnetic perturbations may be contributing to anomalous electron energy transport.
Simulations of spectral broadening by cross-phase modulation (XPM) with chaotic light pulses
(SPIE, 1993-05-01) Henesian, Mark A.; Dixit, Sham N.; Chen, Chien-Jen; Wai, Ping-Kong A.; Menyuk, Curtis
Spectral broadening of single-frequency laser pulses by optical cross-phase modulation (XPM) with chaotic laser pulses in birefringent single-mode optical fibers is investigated numerically and results are compared with experiments. By this process we have generated laser pulses of variable bandwidth (1 - 25 angstrom) at the fundamental wavelength (1053 nm) for amplification in high power solid-state Nd:glass lasers used for inertial confinement fusion research. Simulations indicate that a temporally smooth XPM pulse can be generated with intensity fluctuations of less than 10% and spectral width greater than 50 angstrom using a short length (approximately 5 m) of special low dispersion and low birefringence fiber, e.g., D equals 10 ps/nm-km (normal dispersion) and (Delta) n equals 2 X 10⁻⁵. Readily available fibers of similar length, with parameters of D equals 40 ps/nm-km and (Delta) n equals 6 X 10⁻⁵, can give spectral widths exceeding 25 angstroms, but the noise will range from 25 to 60%. Broadband laser pulses generated by XPM are now routinely used at Lawrence Livermore National Laboratory for active smoothing of the laser irradiance on targets by the technique of smoothing-by-spectral dispersion.
Restricted multiple three-wave interactions: Painlevé analysis
(APS, 1983-03-01) Menyuk, Curtis; Chen, H. H.; Lee, Y. C.
Restricted multiple three-wave interactions, in which a set of wave triads interact through one shared wave, are discussed. The integrability of this system is explored through the use of Painlevé analysis. Numerical results in the special case where there are only two triads are also reported. The results are consistent with the Painlevé analysis.
Integrable Hamiltonian systems and the Lax pair formalism
(APS, 1982-12-01) Menyuk, Curtis; Chen, H. H.; Lee, Y. C.
The Lax pair formalism for finite degree-of-freedom Hamiltonian systems is extended to include systems for which the eigenvalues of the 𝐿 operator are degenerate. This extension is applied to a system of restricted multiple three-wave interactions which describes the interaction of a single, low-frequency, internal ocean wave with higher-frequency external waves.
Hamiltonian Structure of the Higher-Order Corrections to the Korteweg-de Vries Equation
(APS, 1985-10-28) Menyuk, Curtis; Chen, Hsing-hen
Higher-order corrections to the Korteweg-de Vries equation are examined by Hamiltonian methods. Starting from the underlying Hamiltonian systems (e.g., the two-fluid equations in the case of ion-acoustic waves), one finds that the corrected equations have the same Poisson bracket as the Korteweg-de Vries equation at every order. One also finds that the underlying equations become nonlocal at sufficiently high order.
ELF generation in the lower ionosphere via collisional parametric decay
(AGU, 1986-09-01) Ko, K.; Menyuk, Curtis; Reiman, A.; Tripathi, V.; Palmadesso, P.; Papadopoulos, K.
Generation of ELF waves by stimulated parametric coupling of two HF waves in the lower ionosphere is considered. In this region the nonlinear force is dominated by the thermal rather than the ponderomotive nonlinearity. It is shown that this results in lowering the pump threshold for complete decay by more than an order of magnitude while achieving efficiencies in excess of those expected on the basis of the Manley-Rowe relations. The lower-frequency mode excited for E region altitudes is the helicon mode, which continues to frequencies below the ion cyclotron frequency because ion-neutral collisions freeze the ion motion. The application of these results to ELF generation in the lower ionosphere, including power estimates for a proof of principle experiment, is discussed.
On the Hamiltonian structure of ion-acoustic plasma waves and water waves in channels
(AIP, 1986-04-01) Menyuk, Curtis; Chen, Hsing-Hen
It is shown that the Hamiltonian structure of ion-acoustic waves and channel waves may be used to derive the Hamiltonian structure of the Korteweg–de Vries equation and its higher-order corrections. The Hamiltonian approach used here is more systematic and less laborious than standard methods for deriving the Korteweg–de Vries equation. It is also more revealing. In particular, it is shown that the Poisson bracket of the corrected equations equals the Korteweg–de Vries Poisson bracket at every order. It is also shown that the corrected equations become nonlocal at sufficiently high order.
Stochastic Electron Acceleration in Obliquely Propagating Electromagnetic Waves
(APS, 1987-05-18) Menyuk, Curtis; Drobot, A. T.; Papadopoulos, K.; Karimabadi, H.
Stochastic electron acceleration in intense electromagnetic waves, propagating obliquely to an ambient magnetic field, is considered. It is shown that when the waves' parallel phase velocities are supraluminous, the Hamiltonian surfaces are topologically open and, as a consequence, electrons can gain large energies. The results indicate that state-of-the-art, ground-based rf transmitters can accelerate ionospheric electrons to multimegaelectronvolt energies.
Origin of solitons in the real' world
(APS, 1986-06-01) Menyuk, Curtis
In experiments, solitons emerge from arbitrary initial data even when the Hamiltonian perturbations are quite large. In this paper, it is shown explicitly through lowest order that the perturbations which appear in ion acoustic wave and shallow-channel water-wave experiments do not destroy, but merely renormalize, their velocity and shape. Comparisons with other perturbation approaches are made.
Electron acceleration using intense electromagnetic waves
(AIP, 1988-12-01) Menyuk, Curtis; Drobot, A. T.; Papadopoulos, K.; Karimabadi, H.
Electron acceleration by an intense electromagnetic wave incident obliquely to the ambient magnetic field in a plasma is considered. It is shown that the wave amplitude has a stochasticity inducing threshold. Although substantial acceleration can be achieved below this threshold, it is limited to the trapping width of a single resonance. Above threshold, the electrons can accelerate from resonance to resonance. It is also shown that when the parallel phase velocity of the electromagnetic waves is supraluminous, the Hamiltonian surfaces describing the wave–particle interaction are topologically open. In this case, electrons gain large amounts of energy. The mechanism is quite robust, being weakly sensitive to changes in the wave parameters and the electron’s initial energy; as a result, it is an ideal mechanism for space applications. As an application, the conditions are obtained for accelerating electrons to energies of several MeV using ground?based transmitters.
Transient solitons in stimulated Raman scattering
(APS, 1989-06-19) Menyuk, Curtis
It is shown that permanent, solitonlike structures in which the pump retains a large fraction of its initial energy cannot exist for finite energy pulses. Ultimately, solitonlike structures propagate to the back end of the pulse and disappear. A method for propagating pump energy over long distances is proposed.

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