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SUMMARY:Invitación - Charla de Postgrado Miércoles 8 de Abril
DTSTART;VALUE=DATE-TIME:20260408T163000Z
DTEND;VALUE=DATE-TIME:20260408T173000Z
DTSTAMP;VALUE=DATE-TIME:20260408T193249Z
UID:indico-event-322@indico.ing.puc.cl
DESCRIPTION:Estimados\n\nEstán cordialmente invitados al inicio del Ciclo
  de  Charlas de Postgrado del semestre\, la que se realizará el próximo
  miércoles 8 de Abril\, a las 13:30 hrs. en la sala de clases de nuestro 
 Departamento.\n\nSe presentarán:\n\n**Dabne Barrera T.** Alumna de Magí
 ster del área Sistemas de Información\, profesor(a) supervisor(a) Claudi
 a Prieto.\n\nTítulo: "Highly efficient simultaneous 3D joint T1-T2 mappi
 ng of the knee at 0.55T: Comparison of Cartesian and radial strategies".\n
 \nAbstract: To develop and compare two novel 3D frameworks for simultaneo
 us T1-T2 mapping of knee hyaline articular cartilage at 0.55T in ~4 min.\n
 \nTwo 3D T1-T2 mapping sequences were optimized at 0.55T: (i) Cartesian ac
 quisition using VD[1]CASPR trajectory with inversion-recovery (IR) and T2p
 reparations\; and (ii) free-running golden[1]angle radial acquisition inte
 rleaving IR and IRT2prep. Undersampled data were reconstructed using itera
 tive-SENSE with HD-PROST regularization. T1-T2 maps were generated via dic
 tionary matching. Validation included phantom and 10 healthy volunteers\, 
 compared to references. Accuracy\, precision\, intra-session repeatability
 \, map-sharpness\, and reconstruction[1]time were evaluated.\n\nBoth frame
 works achieved whole-knee coverage at 1mm isotropic resolution in 3:48 min
  (Cartesian) and 3:40 min (radial). Phantom T1-T2 estimates correlated wel
 l with references (R² = 0.99) and good Bland-Altman agreement. In-vivo ca
 rtilage T1 were comparable to MOLLI\, while both approaches exhibited syst
 ematically lower T2 than 2D T2-prepared-bSSFP\, consistent with known bSSF
 P bias. Variability was low (CV ~0.10–0.15 for T1\; ~0.10-0.20 ms for T2
 ) with the radial approach showing the lowest T2 variability. Intra-sessio
 n repeatability was high\, with no significant differences between repeate
 d scans (p > 0.05). The Cartesian approach provided sharper maps and faste
 r reconstruction (~1.6 h vs ~3.7 h). Proposed frameworks enable rapid\, is
 otropic knee cartilage quantification at 0.55T in ~4 minutes\, with accura
 te\, precise\, and repeatable measurements.\n\n \n\n---------------------
 ----------\n\n**José I. Gajardo R.** Alumno de Doctorado del área Energ
 ía\, profesor supervisor Javier Pereda.\n\nTítulo: "Optimized Modulation
  Strategies for Parallel Converters".\n\nAbstract: With the increase in v
 ariable renewable generation installations and energy storage systems\, th
 e power converter market has experienced—and is expected to continue exp
 eriencing—significant growth in the coming years. Most of the market is 
 composed of two- or three-level inverters. When power requirements increas
 e\, the parallelization of inverters is the solution offered by many power
  electronics companies. However\, despite its economic advantages\, this a
 pproach presents major drawbacks\, as it compromises overall system effici
 ency and stability due to the emergence of parasitic or circulating curren
 ts between inverters\, especially in photovoltaic and battery systems. Mod
 ulation is essential in inverters\, as it shapes key physical phenomena wi
 thin the system\, such as common-mode voltage and energy losses. Technique
 s like Harmonic Programmed PWM (HPM) enable modulation optimization and im
 prove inverter performance. However\, the benefits of such techniques have
  so far been demonstrated only at low switching frequencies\, which is not
  the case in low-voltage systems employing new semiconductor technologies 
 (SiC and GaN). As a result\, commercial power converters continue to rely 
 on strategies like DPWM and address associated challenges through hardware
  solutions\, which increases system cost. The general objective of this th
 esis project is to develop and validate optimal modulation strategies that
  reduce hardware costs and improve current solutions in terms of efficienc
 y and industrial requirements.\n\nHabrá colación y bebida para los asist
 entes por lo que la asistencia será controlada. Los esperamos a las 13:
 30 hrs. Si vas a participar\, favor inscríbete en el siguiente link y e
 specifica si tienes alguna restricción alimentaria:\n\nhttps://indico.ing
 .puc.cl/event/322/\n\nAtentos saludos\,\n\n \n\nMATÍAS NEGRETE\n\nhttps:
 //indico.ing.puc.cl/event/322/
LOCATION:
URL:https://indico.ing.puc.cl/event/322/
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