Browsing by Author "Miranda, Felipe"

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    Identifying transit driver preferences for work shift structures: An econometric analysis
    (INFORMS, 2008) Miranda, Felipe; Munoz, Juan Carlos; Ortuzar, Juan de Dios
    The combination of a strict labor legislation with daily and weekly time-dependent demand patterns has meant that transit companies tend to suffer significant inefficiencies; indeed, as more drivers than the minimum required are hired, providing services at off-peak periods, many tend to be inactive during these periods. To attack this problem, two strategies have been proposed. The first is using flexible shifts that may change daily according to a predefined contract. The other is using split shifts in which drivers' working hours are split in two to serve both the morning and afternoon peak periods. However, evidence of driver acceptance of these strategies is lacking.
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    SEXUAL POLITICS AND SOCIAL REPRODUCTION IN THE PAMPA DEL TAMARUGAL: SEX-AGE STRUCTURE IN THE TARAPACA 40 CEMETERY (BC 1000-600 AD)
    (Palgrave Macmillan, 2021) Gonzalez Ramirez, Andrea; Saez, Arturo; Herrera Soto, Maria Jose; Leyton, Lia; Miranda, Felipe; Santana Sagredo, Francisca; Uribe Rodriguez, Mauricio
    In this paper we propose explanatory hypotheses about the sexual politics that were from time to time implemented in the configuration of the Pampa del Tamarugal formative community, with the aim to contribute to the archaeological study of social reproduction. The bioanthropological collections of the Tarapaca 40 Cemetery underwent an osteological survey, designed to identify their sexual and age structure. A significant number of contextual references were recovered, and an exploratory analysis of the variation in the sex-age structure of some cemeteries in the region was carried out. The results show a cemetery with all age ranges and a 1:1 sex ratio. On a regional scale, a dichotomous distribution was observed between archaic and formative cemeteries, based on the ratio between adult women and non-adults. We propose that social relations of reproduction and sexual division of labor between the late archaic and the formative society underwent radical transformations, the most direct impact of which could be the social control of female sexuality through the establishment of a kinship-based socio-political regime.
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    Simulated-based training for ultrasound-guided popliteal block: determining the learning curve and transference to real patient
    (2024) Miranda, Pablo; Araneda, Andrea; Molina, Natalia; Miranda, Felipe; Morrison Corrales, Christopher Joseph; Corvetto Aqueveque, Marcia Antonia; Altermatt Couratier, Fernando René
    Background and Aims: This study aimed to determine the learning curve for an ultrasound-guided popliteal block and the transference of this training to a real patient situation. Methods: After approval by the ethics committee, ten first-year anesthesia residents were recruited to participate in a simulated-based training program to perform a single shot in plane popliteal block. (NCT06081790) Training consisted of 10 individual sessions, with direct feedback from the instructor, with a specific Laerdal® sciatic popliteal block phantom, lasting one hour and distributed weekly. At the end of each session, the resident’s performance was assessed. Residents were videotaped while performing the block, which was to be evaluated using a validated global rating scale (GRS). Additionally, a tracking motion device (ICSAD) attached to the operator’s hands recorded the total distance traveled by both hands (Total Path Length=TPL) and total procedure time (TPT). One week later, the same assessment was done on a real patient. Results: Ten residents completed the training and the assessments. Median values of GRS scores significantly improved from 14 to 28 through the training (p=0.02) (figure 1). Regarding ICSAD scores, TPT improved from 126 to 59.5 seconds (p=0.004), and TPL improved from 11.06 to 9.3 meters (p=0.432). We found no significant differences between the last simulated session and the subsequent measurement in an actual patient.