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Hans D. Hallen
North Carolina State University
132Publications
21H-index
2,114Citations
Publications 134
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The susceptibility of millimeter-wave (mmWave) signals to physical blockage and abrupt signal strength variations presents a challenge to reliable 5G communication. This work proposes and examines the feasibility of utilizing lower-frequency signals as early-warning indicators of mobile mmWave signal blockage or recovery. A physics-based channel simulation tool incorporating Fresnel diffraction and image sources is employed to demonstrate that sub-6 GHz signals "lead" mmWave signals in reaching ...
#1Hans D. HallenH-Index: 21
#2Brandon J. N. LongH-Index: 1
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#1Shuang Fang LimH-Index: 14
#2Janina WirthH-Index: 2
Last.Hans D. HallenH-Index: 21
view all 5 authors...
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The susceptibility of millimeter-wave (mmWave) signals to physical blockage and abrupt signal strength variations presents a challenge to reliable 5G communication. This work proposes and examines the feasibility of utilizing lower-frequency signals as early-warning indicators of mobile mmWave signal blockage or recovery. A physics-based channel simulation tool incorporating Fresnel diffraction and image sources is employed to demonstrate that sub-6 GHz signals often "lead" mmWave signals in rea...
Source
#1Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
#2Ling Li (NCSU: North Carolina State University)H-Index: 3
Last.Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
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Methylation in DNA is a controlling factor in gene expression, embryonic development, and has been found to be important in infections and cancer. From a basic biology point of view, great heterogeneity has been found in methylation levels within tissues, so questions arises as to how and why. We show that methylated-DNA (m-DNA) can be distinguished from non-methylated (n-DNA) with nano-bowtie- and resonance- enhanced Raman spectra. By tuning the bowtie antenna to the resonance wavelength, both ...
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#1Brandon J. N. Long (NCSU: North Carolina State University)H-Index: 1
#2Wenxia Zheng (NCSU: North Carolina State University)H-Index: 11
Last.Hans D. Hallen (NCSU: North Carolina State University)H-Index: 21
view all 4 authors...
The discovery of soft structures in dinosaur bone with the morphological and molecular characteristics of blood vessels in extant vertebrates was both surprising and controversial. Mounting evidence suggests that these soft tissues are blood vessels, their preservation driven in part by reactive oxygen species derived from hemoglobin degradation. More data are needed to support this hypothesis. Raman spectroscopy, and resonance Raman in particular, can provide detailed information as to the chem...
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