Robust video mosaicing through topology inference and local to global alignment

1998 ◽  
pp. 103-119 ◽  
Author(s):  
Harpreet S. Sawhney ◽  
Steve Hsu ◽  
R. Kumar
Keyword(s):  
Global Alignment ◽  
Video Mosaicing ◽  
Topology Inference

DLIG: Direct Local Indirect Global Alignment for Video Mosaicing

2011 ◽  
Vol 21 (12) ◽  
pp. 1869-1878 ◽  
Author(s):  
Marc Vivet ◽  
Brais Martinez ◽  
Xavier Binefa
Keyword(s):  
Global Alignment ◽  
Video Mosaicing

Observing the relaxation of molecular orientation in sheared liquid crystalline polymer solutions

1990 ◽  
Vol 48 (4) ◽  
pp. 1092-1093
Author(s):  
Wendy Putnam ◽  
Christopher Viney
Keyword(s):  
Molecular Orientation ◽  
Liquid Crystalline Polymer ◽  
Liquid Crystalline ◽  
Crystalline Polymer ◽  
Polymer Processing ◽  
Molecular Alignment ◽  
Global Alignment ◽  
Shear Direction ◽  
Axial Strength ◽  
Strength And Stiffness

Liquid crystalline polymers (solutions or melts) can be spun into fibers and films that have a higher axial strength and stiffness than conventionally processed polymers. These superior properties are due to the spontaneous molecular extension and alignment that is characteristic of liquid crystalline phases. Much of the effort in processing conventional polymers goes into extending and aligning the chains, while, in liquid crystalline polymer processing, the primary microstructural rearrangement involves converting local molecular alignment into global molecular alignment. Unfortunately, the global alignment introduced by processing relaxes quickly upon cessation of shear, and the molecular orientation develops a periodic misalignment relative to the shear direction. The axial strength and stiffness are reduced by this relaxation.Clearly there is a need to solidify the liquid crystalline state (i.e. remove heat or solvent) before significant relaxation occurs. Several researchers have observed this relaxation, mainly in solutions of hydroxypropyl cellulose (HPC) because they are lyotropic under ambient conditions.

scholarly journals Allograft Subsidence Decreases Postoperative Segmental Lordosis With Minimal Effect on Global Alignment Following ACDF

2021 ◽  
pp. 219256822098827
Author(s):  
Zachariah W. Pinter ◽  
Anthony Mikula ◽  
Matthew Shirley ◽  
Ashley Xiong ◽  
Scott Wagner ◽  
...  
Keyword(s):  
Global Alignment ◽  
Minimal Effect ◽  
Cervical Alignment ◽  
Entire Cohort ◽  
Patient Reported ◽  
Cage Subsidence ◽  
Student’S T ◽  
Segmental Lordosis ◽  
The Impact

Study Design: Retrospective cohort study. Objective: Studies investigating the impact of interbody subsidence in ACDF suggest a correlation between subsidence and worse radiographic and patient-reported outcomes. The purpose of this study was to assess whether allograft subsidence assessed on CT is associated with worse cervical alignment. Methods: We performed a retrospective review of a prospective cohort of patients undergoing 1 to 3 level ACDF. Cervical alignment was assessed on standing radiographs performed preoperatively, less than 2 months postoperatively, and greater than 6 months postoperatively. Allograft subsidence was assessed on CT scan performed at least 6 months postoperatively. Patients with at least 1 level demonstrating greater than 4mm of cage subsidence were classified as severe subsidence. Student’s t-test was used to compare all means between groups. Results: We identified 66 patients for inclusion, including 56 patients with non-severe subsidence and 10 patients with severe subsidence. For the entire cohort, there was a significant increase in C2-7 Lordosis (p = 0.005) and Segmental Lordosis (p < 0.00 001) from preoperative to early postoperative. On comparison of severely and non-severely subsided levels, severely subsided levels demonstrated a significantly greater loss of segmental lordosis from early to mid-term follow-up than non-severely subsided levels (-4.89 versus -2.59 degrees, p < 0.0001), manifesting as a significantly lower segmental lordosis at >6 months postoperative (0.54 versus 3.82 degrees, p < 0.00 001). There were no significant differences in global cervical alignment parameters between patients with severe and non-severe subsidence. Conclusions: Severe subsidence is associated with a significant increase in loss of segmental lordosis, but has minimal effect on global cervical alignment parameters.

P84. Which components of the global alignment proportionality score have the greatest impact on outcomes in adult spinal deformity corrective surgery?

2021 ◽  
Vol 21 (9) ◽  
pp. S180-S181
Author(s):  
Oscar Krol ◽  
Peter G. Passias ◽  
Virginie Lafage ◽  
Renaud Lafage ◽  
Justin S. Smith ◽  
...  
Keyword(s):  
Spinal Deformity ◽  
Adult Spinal Deformity ◽  
Global Alignment ◽  
Corrective Surgery
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