Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 345 for “"hopping"”.
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Hope-Hopping
This collection of texts, accompanied by a series of artworks, speculates upon a new artistic ecology of displacement that emerges at the intersection between post-coloniality, cosmopolitanism, and technopolitics. Exilic art practice takes myriad forms in this post-1989’s new “New World”. There are …
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Mitigating radar interference via time hopping
Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-05-01
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Preliminary Design of an Asteroid Hopping Mission
<p>In 2010, NASA announced that its new vision is to support private space launch operations. It is anticipated that this new direction will create the need for new and innovative ideas that push the current boundaries of space exploration and contain the promise of substantial gain, both in …
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Modular Hopping and Running via Parallel Composition
… pioneered a paradigm for the synthesis of planar hopping using a composition of ``parts'': controlled vertical hopping, controlled forward speed, and controlled body attitude. Such reduced degree-of-freedom compositions also seem to appear in running animals across several orders of magnitude of …
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Uniroo--a one legged dynamic hopping robot
Thesis (B.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1991.
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Quantum chemistry and surface hopping dynamics of azobenzenes
… molecular dynamics with trajectory surface hopping is applied to model the photoisomerization of azobenzene dimers, (i) for the isolated case (exhibiting the exciton coupling between two molecules) as well as (ii) for the constrained case (providing the van der Waals interaction with …
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Modeling and Control of a Vertical Hopping Robot
<p>Single degree-of-freedom hopping robots are typically modeled as spring loaded inverted pendulums (SLIPs). This simplified model, however, does not consider the overall leg geometry, consequently making it difficult to investigate the optimized inertial distribution of the leg for agile …
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Slow frequency and time hopping in wireless communication
… in the scheme called SFH/TDMA (Slow Frequency Hopping/Time Division Multiple Access). Comparing the performance of SFH/TDMA with that of CDMA (Code Division Multiple Access) is a problem of both practical and theoretical interest. We contribute to the understanding of the problem by comparing a …
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Tradespace model for planetary surface exploration hopping vehicles
… planetary surface exploration. One of these is hopping vehicles, which do not require fluid contact or ground contact in order to move, but instead propulsively balance thrust from their engines against gravity to propel themselves over the surface. Hopping vehicles are still a nascent …
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Analytic Results for Hopping Models with Excluded Volume Constraint
… vacancies. Part II: One-Dimensional Periodic Hopping Models with Broken Translational Invariance.Case of a Mobile Directional Impurity We study a random walk on a one-dimensional periodic lattice with arbitrary hopping rates. Further, the lattice contains a single mobile, directional impurity …
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Channel-coded time-hopping and direct-sequence ultrawideband systems
… with the aid of EXIT charts. A DS and a Time-Hopping (TH) Pulse Position Modulated (PPM) UWB systems are studied using EXIT charts and it is demonstrated that classic regular Forward Error Correction (FEC) encoders are unable to arbitrarily approach the system’s capacity.<br/>Hence Chapter 4 …
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Recovering elastic energy in a single-legged hopping robot
… this project, I create an analytical model of a hopping robot and a corresponding physical prototype that will serve as an experimental platform to investigate the relationship between Ek /Ein, and jump performance. Select runs of the simulation show a positive relationship between Ek/Ein and the …
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Constrained Clustering for Frequency Hopping Spread Spectrum Signal Separation
Frequency Hopping Spread Spectrum (FHSS) signaling is used across many devices operating in both regulated and unregulated bands. In either situation, if there is a malicious device operating within these bands, or more simply a user operating out of the required specifications, the identification …
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Software-based implementation of a frequency hopping two-way radio
Thesis (M. Eng.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 1997.
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Moving beyond salesperson turnover: a dynamic model of salesperson job-hopping
Job-hopping, defined as the trajectory of voluntary inter-organizational transitions over one’s career, is a top concern for managers as they witness their salespeople change jobs more frequently and with greater ease than ever before. Indeed, many hiring managers indicate that a history of …
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Frequency hopping using CDMA to avoid malicious attack in han networks
Frequency hopping and Code-Division Multiple Access (CDMA) is often deployed to protect wireless communication from malicious attacks. The data is enabled to be received by the recipients. The data is delayed or blocked when it try to enter the network. This project is developed by hybrid the …
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Balancing and hopping motion control algorithms for an under-actuated robot
… planar balancing, spatial balancing and planar hopping motions is demonstrated by simulation results. Although hopping motion of a spatial under-actuated robot is not considered in this thesis, it is shown in simulations that, starting from an upright configuration, the 3D controller is able to …
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