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DTSTART;TZID=America/New_York:20201211T140000
DTEND;TZID=America/New_York:20201211T150000
DTSTAMP:20260506T082236
CREATED:20201210T000912Z
LAST-MODIFIED:20201210T000912Z
UID:4622-1607695200-1607698800@ece.northeastern.edu
SUMMARY:ECE MS Thesis Defense: Xinan Huang
DESCRIPTION:MS Thesis Defense: Exploring Effectiveness of Naive Spatio-Temporal Exploits for Depth Completion \nXinan Huang \nLocation: Zoom Link \nAbstract: With an increasing need for usable depth for autonomous navigation systems such as self-driving cars\, depth completion is becoming an increasingly studied subject. RGB data provide much-needed aid in providing good recreation of dense depth maps from sparse LiDAR output. Yet\, these data are also provided in sequential form. And thus for this thesis\, we aim to explore how effective using network layers that exploit Spatio-temporal features would be in achieving higher depth completion accuracy. We propose adding 3D convolutional layers and ConvGRU layers to a preexisting depth completion network and perform ablation studies on the effectiveness of these methods. We were able to verify that naive approaches are able to garner improvements quantitatively and qualitatively\, but training results show that additional geometric constraints would perhaps boost such exploits even further for better depth completion results.
URL:https://ece.northeastern.edu/event/ece-ms-thesis-defense-xinan-huang/
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DTSTART;TZID=America/New_York:20201211T150000
DTEND;TZID=America/New_York:20201211T160000
DTSTAMP:20260506T082236
CREATED:20201207T214155Z
LAST-MODIFIED:20201207T214227Z
UID:4615-1607698800-1607702400@ece.northeastern.edu
SUMMARY:ECE PhD Dissertation Defense: Qifan Li
DESCRIPTION:PhD Dissertation Defense: Development of Magnetodielectric Materials with Low Loss and High Snoek’s Product for Microwave Applications \nQifan Li \nLocation: Teams Link \nAbstract: Exhibiting both relative magnetic permeability and electric permittivity greater than unity\, magnetodielectric materials have been attracting great attention in both academia and industry for next-generation communication\, sensing\, and radar applications. It is always of great interest for researchers to tailor the magnetic properties of magnetodielectric materials for high permeability\, low magnetic loss and large Snoek’s product towards higher-frequency applications.\nHexagonal ferrites form an important group of magnetodielectric materials. Besides the six best known hexagonal structures\, i.e.\, M-\, W-\, X-\, Y-\, Z- and U-type hexaferrites\, some unique hexagonal structures\, named 18H hexaferrites\, were discovered in 1970s. For the first time\, the dynamic magnetic properties and their temperature dependence of polycrystalline Mg-Zn 18H hexaferrites at microwave frequencies are investigated. Owing to a remarkably low damping coefficient\, the frequency dispersion of complex permeability reveals a narrow and strong resonance. The Mg-Zn 18H hexaferrites show excellent loss tangent of 0.07 at 3 and 4 GHz. Accordingly\, narrow FMR linewidths in the range of 486-660 Oe are measured. The temperature dependence of the damping coefficient is 0.0004 /°C\, indicating a small variation of the intrinsic loss with temperature. These results are the best performance among the polycrystalline microwave ferrites reported so far for the S- and C-band applications.\nMagnetodielectric composites\, prepared by dispersing magnetic particles homogenously in an electrically insulating matrix\, are another type of magnetodielectric materials. It is crucial to predict the effective magnetic properties of the multi-phase mixture. A modified effective medium theory is proposed by extending the traditional formulas with the effects of particle-size distribution and clustering of inclusions. Its accuracy is verified by two kinds of magnetodielectric composites over wide ranges of both particle concentration and frequency.\nThe magnetic properties of microwave ferrites are strongly affected by their polycrystalline microstructure\, which is mainly controlled by the sintering process. The two-step sintering technique is systematically studied for the preparation of hexaferrites. With optimal combinations of sintering temperatures in each step\, significant reduction in magnetic loss and enhancement in Snoek’s product are achieved with uniform and fine-grained structures.\nPrecise measurement of broadband permeability and permittivity is crucial to develop advanced magnetodielectric materials. A straightforward\, explicit and noniterative method is proposed by eliminating the error from the direct measurement of sample position in the standard Nicolson-Ross-Weir method. Based on the results from two kinds of magneto-dielectric materials measured in two sets of test fixtures of different geometries\, this method is theoretically and experimentally proven to have high and position-independent accuracy over a wide frequency range.\nFinally\, a patch antenna on Mg-18H magnetodielectric substrate is designed to operate at 3.6 GHz for 5G wireless communication. Benefiting from the large refractive index of the magnetodielectric material\, the size of the patch antenna is significantly reduced. Moreover\, compared to the dielectric substrate providing the same miniaturization factor\, magnetodielectric antennas exhibit significant advantages for larger bandwidth and gain.
URL:https://ece.northeastern.edu/event/ece-phd-dissertation-defense-qifan-li/
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