Algorithms for frame alignment — some comparisons

1985 ◽  
Vol 132 (7) ◽  
pp. 529 ◽  
Author(s):  
E.V. Jones ◽  
M.N. Al-Subbagh
Keyword(s):  
Frame Alignment

scholarly journals Handheld versus mounted laser speckle contrast perfusion imaging demonstrated in psoriasis lesions

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ata Chizari ◽  
Mirjam J. Schaap ◽  
Tom Knop ◽  
Yoeri E. Boink ◽  
Marieke M. B. Seyger ◽  
...  
Keyword(s):  
Perfusion Imaging ◽  
Laser Speckle ◽  
Psoriatic Skin ◽  
Post Processing ◽  
Speed Of Light ◽  
Contrast Imaging ◽  
Speckle Contrast ◽  
Frame Alignment ◽  
Wide Range ◽  
Perfusion Maps

AbstractEnabling handheld perfusion imaging would drastically improve the feasibility of perfusion imaging in clinical practice. Therefore, we examine the performance of handheld laser speckle contrast imaging (LSCI) measurements compared to mounted measurements, demonstrated in psoriatic skin. A pipeline is introduced to process, analyze and compare data of 11 measurement pairs (mounted-handheld LSCI modes) operated on 5 patients and various skin locations. The on-surface speeds (i.e. speed of light beam movements on the surface) are quantified employing mean separation (MS) segmentation and enhanced correlation coefficient maximization (ECC). The average on-surface speeds are found to be 8.5 times greater in handheld mode compared to mounted mode. Frame alignment sharpens temporally averaged perfusion maps, especially in the handheld case. The results show that after proper post-processing, the handheld measurements are in agreement with the corresponding mounted measurements on a visual basis. The absolute movement-induced difference between mounted-handheld pairs after the background correction is $$16.4\pm 9.3~\%$$ 16.4 ± 9.3 % (mean ± std, $$n=11$$ n = 11 ), with an absolute median difference of $$23.8\%$$ 23.8 % . Realization of handheld LSCI facilitates measurements on a wide range of skin areas bringing more convenience for both patients and medical staff.

Legalizing Street Vending in Los Angeles: Reframing a Movement during the Fourth Wave of Feminism

2020 ◽  
pp. 089692052097678
Author(s):  
Sara Bruene ◽  
Moshoula Capous-Desyllas
Keyword(s):  
Los Angeles ◽  
Women Of Color ◽  
Qualitative Interviews ◽  
Labor Rights ◽  
Street Vendor ◽  
Street Vending ◽  
Frame Alignment ◽  
Fourth Wave ◽  
The City

Street vending was criminalized in the city of Los Angeles since the 1930s. The Los Angeles Street Vendor Campaign (LASVC) utilized several framing tactics over the last several years in order to mobilize participants to decriminalize and legalize the profession of street vending. This article applies frame alignment theory to illustrate how the LASVC reached its goals. This case study utilizes qualitative interviews of key players in the LASVC movement and a content analysis of LASVC’S Facebook page to document their push toward decriminalization over the course of 1 year. The LASVC transformed their narrative from issues of immigration and labor rights and reframed street vending as a women’s justice issue. By doing so, the LASVC extended the boundaries of their frames to incorporate the voices of women of color whose online and on-the-ground efforts to mobilize a larger population manifested during an era of the fourth wave feminism.

K-Factor Solution for Combined Braced–Unbraced Offshore Jacket Frames

2019 ◽  
Vol 142 (2) ◽  
Author(s):  
Albert Ku ◽  
Jieyan Chen ◽  
Stephen Gunzelman
Keyword(s):  
Finite Element Method ◽  
Wave Loads ◽  
Braced Frames ◽  
American Institute ◽  
Moment Frame ◽  
Factor Solution ◽  
Frame Alignment ◽  
Entire Structure ◽  
K Factor ◽  
Portal Frame

Abstract Many offshore jackets have no braces between the top of jacket and the bottom of topsides deck. This can be either due to the installation requirement and/or an effort to reduce wave loads. This kind of jacket bay is a portal frame. For the design of portal frame columns, the current offshore standards point to the unbraced frame alignment chart solution from onshore standards such as the American Institute of Steel Construction (AISC). In this paper, we will show that the AISC alignment chart unbraced frame K-factor solution is conservative for offshore applications, and perhaps too conservative. This is because the traditional alignment chart assumes that the entire structure is a moment frame. In offshore applications, the unbraced frame is almost always combined with braced frames from above and/or below. In this paper, we will derive a K-factor solution that is suitable for a braced/unbraced frame combination. This solution is validated with structural buckling finite element method (FEM) analyses of typical offshore frames. Design implications from using the traditional alignment chart versus current new K-factor solution are also discussed.

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