Cumple cincuenta años la Academia de Ingeniería, México

 El 21 de junio de 2024 la Academia de Ingeniería (AI) cumplió sus 50 años de existencia. Hubo cortos discursos de los expresidentes, un video donde habla el Dr. Marco Antonio Murray Lasso (q.e.p.d), entrega de diplomas conmemorativos a los expresidentes y Académicos de Honor (a mí me tocó), y se develó la placa conmemorativa.

 

La Academia Nacional de Ingeniería y la Academia Mexicana de Ingeniería se fusionaron en 2002, en la Academia de Ingeniería, México.

 El Ing. Felipe Ochoa Rosso fue un destacado ingeniero civil, obtuvo su doctorado en el M.I.T. y fue Académico de Honor de la AI (rip 8abr2022). Acudió a la ceremonia su viuda, la Sra. Sandra Rosellini Ochoa, quien dirige una asociación sin fines de lucro, la Asociación Nacional contra el Infarto Cerebral, A. C.

Los expresidentes y académicos de honor recibieron diplomas de reconocimiento de nuestra Presidente, la Dra. Mónica Barrera. Yo recibí el mío.

En el video, Adolfo se acerca a la Presidenta, Dra. Mónica Barrera, para recibir su reconocimiento como Académico de Honor (ver nota en este blog, pulsando aquí y acá). Estrecha la mano primero del Dr. Alejandro López Toledo y después la del Dr. Eduardo Castañón Cruz, ambos miembros activos de la AI.

Celebra El Colegio Nacional los 90 años de vida del Dr. Pablo Rudomín Zevnovaty

El 17 de junio de 2004, en la sede del Colegio Nacional, hubo una ceremonia --pláticas primero, luego habló Pablo, terminando en un pequeño agasajo-- para conmemorar el aniversario 90 del Dr. Pablo Rudomín, distinguido fisiólogo, conocido a nivel internacional.

 

Con saco café obscuro, Adolfo Guzmán. Pablo, el homenajeado, con bastón

 

Junto a Pablo aparecen su hija, su esposa Flora, y su hijo Isaac.

 

A Three-Dimensional Extension of the Slope Chain Code: Analyzing the Tortuosity of the Flagellar Beat of Human Sperm

 Javier Bribiesca and others have analyzed the tortuosity of the movement of sperm. The full document can be dowloaded here. Its abstract follows.

Abstract. In the realm of 3D image processing, accurately representing the geometric nuances of line curves is crucial. Building upon the foundation set by the Slope Chain Code (SCC), which adeptly represents intricate two-dimensional curves using an array capturing the exterior angles at each vertex, this study introduces an innovative 3D encoding method tailored for polygonal curves. 

     This 3D encoding employs parallel slope and torsion chains, ensuring invariance to common transformations like translations, rotations, and uniform scaling, while also demonstrating robustness against mirror imaging and variable starting points. 

     A hallmark feature of this method is its ability to compute tortuosity, a descriptor of curve complexity or winding nature. By applying this technique to biomedical engineering, we delved into the flagellar beat patterns of human sperm. These insights underscore the versatility of our 3D encoding across diverse computer vision applications.

Keywords: 3D tortuosity, Slope Chain Code, 3D sperm flagellar beat, shape descriptor

 Authors: Andrés Bribiesca-Sánchez, Adolfo Guzmán-Arenas, Fernando Montoya, Dan S. Díaz-Guerrero, Haydée O. Hernández, Paul Hernández-Herrera, Alberto Darszon, Gabriel Corkidi, Ernesto Bribiesca.

We use tortuosity as a shape descritor to characterize brain structures

 An article that uses tortuosity as a shape characteristic has appeared in 2024 in BMC Medical Imaging. Its full text can be dowloaded here. Its abstract follows.

Abstract. In this study, we propose a novel method for quantifying tortuosity in 3D voxelized objects. As a shape characteristic, tortuosity has been widely recognized as a valuable feature in image analysis, particularly in the field of medical imaging. Our proposed method extends the two‑dimensional approach of the Slope Chain Code (SCC) which creates a one‑dimensional representation of curves. The utility of 3D tortuosity (τ3D ) as a shape descriptor was investigated by characterizing brain structures. The results of the τ3D computation on the central sulcus and the main lobes revealed significant differences between Alzheimer’s disease (AD) patients and control subjects, suggesting its potential as a biomarker for AD. We found a p < 0.05 for the left central sulcus and the four brain lobes.

Keywords. 3D tortuosity, Brain morphology, Alzheimer’s disease, Discrete tortuosity.

Authors: María Julieta Mateos, Ernesto Bribiesca, Adolfo Guzmán-Arenas, Wendy Aguilar, Jorge A. Márquez-Flores.