Artículos de conferencia

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805 Complications of Gastrointestinal Endoscopy in 85,391 Procedures
(Mosby-Elsevier, 2012) Espino Espino, Alberto Antonio; García Astorquiza, Ximena Andrea; Mac Namara, Macarena; Richter Roca, Hugo Michael; Pimentel Muller, Fernando; Biel Morales, Francisco Javier; Robles García, Camila Fernanda; Callejas, Matías F.; Sharp Pittet, Allan Carlos; Donoso, Andrés; Candia Balboa, Roberto Andrés; González Donoso, Robinson; Jarufe Cassis, Nicolás; Arrese, Marco; Álvarez Lobos, Manuel; Padilla Pérez, Oslando
Background: Complications are inherent to GI endoscopy (GIE) and do not necessarily imply endoscopist's negligence. They may occur even using highest standards of practice. Objectives: To analyze the frequency and severity of complications occurring within 30 days after of the GIE at a single university hospital in Chile. Methods: We reviewed the records about patients who underwent GIE from January 2001 through May 2011. Results: A total of 85,391 GIE were evaluated. Procedures: 46,928 (55%) esophagogastroduodenoscopy (EGD); 27,993 (32.8%) diagnostic colonoscopies; 1427 (1.7%) polypectomies; and other procedures (hemostasis, variceal band ligation (VBL), foreign-body removal, dilation, stents, PEG, ERCP, EUS and double balloon endoscopy) 9043 (10.5%). A total of 299 complications were associated with GIE (59 % female, mean age 63 years, range 5 - 99). The overall complications rate was 0.35% (cardiopulmonary (CP) 0.1%, bleeding 0.07%, perforation 0.06%, infection 0.04%, pancreatitis 0.03% and other). The overall complication rate was higher in therapeutic procedures (TP) vs diagnostic procedures (DP) (2.7% v/s 0.16%, p<0.0001). The percentage of severe complications was higher in TP vs DP (52.3% vs 28.4%, p<0.0001). The overall complication rate for EGD was 0.14% (CP 0.07%, perforation 0.017%, bleeding 0.019%); diagnostic colonoscopy, 0.27% (CP 0.1%, perforation 0.06%, bleeding 0.02%); and polypectomy, 1.8% (CP 0.14%, perforation 0.28%, bleeding 0.98%). A total of 15 deaths occurred (overall rate 0.018%, 83% in TP). The overall mortality rate was higher in TP vs DP (0.2% v/s 0.003%, p<0.0001). The mortality rate for PEG was 0.7%; VBL 0.4%; ERCP 0.2%; diagnostic colonoscopy 0.004%; EGD 0.004%; and polypectomy 0%. Conclusions: GIE is associated with complications and mortality. The severity and risk of complications are higher in therapeutic procedures. These risks should be clearly explained to patients and their family before the procedure.
A Logarithmic X-Ray Imaging Model for Baggage Inspection: Simulation and Object Detection
(IEEE, 2017) Mery Quiroz, Domingo Arturo; A. K. Katsaggelos
In the last years, many computer vision algorithms have been developed for X-ray testing tasks. Some of them deal with baggage inspection, in which the aim is to detect automatically target objects. The progress in automated baggage inspection, however, is modest and very limited compared to what is needed because X-ray screening systems are still being manipulated by human inspectors. In this work, we present an X-ray imaging model that can separate foreground from background in baggage screening. The model can be used in two main tasks: i) Simulation of new X-ray images, where simulated images can be used in training programs for human inspectors, or can be used to enhance datasets for computer vision algorithms. ii) Detection of (threat) objects, where new algorithms can be employed to perform automated baggage inspection or to aid an user in the inspection task showing potential threats. In our model, rather than a multiplication of foreground and background, that is typically used in X-ray imaging, we propose the addition of logarithmic images. This allows the use of linear strategies to superimpose images of threat objects onto X-ray images and the use of sparse representations in order to segment target objects. In our experiments, we simulate new X-ray images of handguns, shuriken and razor blades, in which it is impossible to distinguish simulated and real X-ray images. In addition, we show in our experiments the effective detection of shuriken, razor blades and handguns using the proposed algorithm outperforming some alternative state-of- the-art techniques.
A Novel Quasi-Spherical Nested Microphone Array and Multiresolution Modified SRP by GammaTone Filterbank for Multiple Speakers Localization
(2019) Firoozabadi, A.D.; Irarrazaval Mena, Pablo; Adasme P.; Durney, H.; Olave, M.S
Acrylamide mitigation in potato chips by using NaCl
(Springer Nature, 2010) Pedreschi Plasencia, Franco; Granby, Kit; Risum, Jørgen
In April 2002, Swedish researchers shocked the world when they presented preliminary findings on the presence of acrylamide in fried and baked foods, most notably potato chips and French fries, at levels of 30-2,300 ppb. The objective of this research was to study the effect of immersing potato slices in a NaCl solution over the acrylamide formation in the resultant potato chips. Potato slices (Verdi variety, diameter 40 mm, width 2.0 mm) were fried at 170 A degrees C for 5 min (final moisture content of similar to 2.0%). Prior to frying, the potato slices were treated in one of the following ways: (1) control slices (unblanched or raw potato slices); (2) slices blanched at 90 A degrees C for 5 min in water; (3) slices blanched at 90 A degrees C for 5 min plus immersed in a 1 g/100 g NaCl solution at 25 A degrees C for 5 min; (4) slices blanched at 90 A degrees C for 5 min plus immersed in a 3 g/100 g NaCl solution at 25 A degrees C for 5 min; (5) slices blanched at 90 A degrees C for 5 min plus immersed in distilled water at 25 A degrees C for 5 min; and (6) slices blanched at 90 A degrees C for 5 min in a 3 g/100 g NaCl solution. Blanching followed by the immersion of potato slices in 1 g/100 g NaCl solution was effective in reducing acrylamide content in similar to 62%; however, almost half of this percentage (similar to 27%) could be attributed to the effect of NaCl and 35% to the effect of the slight heating treatment during salt immersion step (25 A degrees C for 5 min). Blanching seems to make the NaCl diffusion in potato tissue easier leading to a significant acrylamide reduction in the potato slices after frying.
Acrylamide reduction in potato chips by using commercial asparaginase in combination with conventional blanching
(Elsevier Science BV, 2011) Pedreschi Plasencia, Franco Wilfredo; Mariotti Celis, María Salomé; Granby, Kit; Risum, Jorgen
In this research acrylamide reduction in potato chips was investigated in relation to blanching and asparaginase immersion treatments before final frying. Potatoes slices (Verdi variety, diameter: 40 mm, thickness: 2.0 mm) were fried at 170 degrees C for 5 min (final moisture content of similar to 2.0 g/100 g). Prior to frying, potato slices were treated in one of the following ways: (i) Rinsing in distilled water (control I); (ii) Rinsing in distilled water plus blanching in hot water at 85 degrees C for 3.5 min; (iii) Rinsing in distilled water plus immersion in an asparaginase solution (10000 ASNU/L) at 50 degrees C for 20 min; (iv) Rinsing in distilled water plus blanching in hot water at 85 degrees C for 3.5 min plus immersion in an asparaginase solution (10000 ASNU/L) at 50 degrees C for 20 min; (v) Rinsing in distilled water plus blanching in hot water at 85 degrees C for 3.5 min plus immersion in distilled water at 50 degrees C for 20 min (control II). Blanching in hot water (ii) was almost as effective as asparaginase potato immersion (iii) in order to diminish acrylamide formation in potato chips (acrylamide reduction was similar to 17% of the initial acrylamide concentration). When potato slices were blanched before asparaginase immersion, the acrylamide content of the resultant potato chips was reduced considerably by almost 90%. We have demonstrated that blanching of potato slices plus asparaginase treatment is an effective combination for acrylamide mitigation during frying. It seems to be that blanching provokes changes in the microstructure of potato tissue leading to an easier and more effective diffusion of asparaginase. (C) 2011 Elsevier Ltd. All rights reserved.
Action Recognition in Video Using Sparse Coding and Relative Features
(2016) Alfaro, A.; Mery Quiroz, Domingo Arturo; Soto, A.
Adaptation process of multimodal books for deaf people
(2017) Veliz, Soledad; Espinoza, Victoria; Sauvalle, Ignacia; Arroyo, Rodrigo; Garolera, Marion; Aviles, F.P.; Sanchez, R.; Bykbaev, V.R.; Guerra, P.I.
In this study, we present the systematized results of the experience of adapting three multimodal digital books for deaf and hard of hearing (D/HH) children and young people. A five-phase methodology is proposed and challenges, problems and possible solutions are put forward. It is expected that the systematization results useful for other educative resources teams developing fot D/HH children and young people.
Affective polarization and collective memory of the military coup
(2024) Lay Martinez, Siugmin Paz; Manzi, Jorge; González, Roberto; Carvacho García, Héctor; Miranda, Daniel; Haye M., Andrés
An Interactive Relevance Feedback Interface for Evidence-Based Health Care
(2018) Donoso-Guzman, Ivania; Parra Santander, Denis Alejandro; Assoc Comp Machinery
Attributions and helping: the mediator role of empathy and social responsibility
(2021) Lay Martinez, Siugmin Paz; González Gutiérrez, Roberto; Zagefka, Hanna
Automated Threat Objects Detection with Synthetic Data for Real-Time X-ray Baggage Inspection
(2021) Chaturvedi, Kunal; Braytee, Ali; Vishwakarma, Dinesh Kumar; Saqib, Muhammad; Mery Quiroz, Domingo Arturo; Prasad, Mukesh
Automated x-ray object recognition using an efficient search algorithm in multiple views
(2013) Mery Quiroz, Domingo Arturo; Riffo, V.; Zuccar, I.; Pieringer, C.
Automatic defect recognition in x-ray testing using computer vision
(2017) Mery Quiroz, Domingo Arturo; Arteta, C.
B-ePain: A Wearable Interface to Self-Report Pain and Emotions
(2016) Rodríguez Ramírez, Iyubanit; Fuentes Cimma, Javiera Carolina; Herskovic, Valeria; Campos, Mauricio
Big data and policy making: between real time management and the experimental dimension of policies
(2019) Concilio, Grazia; Pucci, Paola; Vecchio, Giovanni; Lanza, Giovanni; Misra, Sanjay; Gervasi, Osvaldo; Murgante, Beniamino; Stankova, Elena; Korkhov, Vladimir; Torre, Carmelo; Rocha, Ana Maria A.C.; Taniar, David; Apduhan, Bernady O.; Tarantino, Eufemia
Biomonitoring of metals in inhabitants of Northern Chile: implications of surveillance in areas with historical exposures
(EHP Publishing, 2020) Cortés Arancibia, Sandra; Ríos B., Juan Carlos; Leiva Cisternas, Cinthya Aracely; Medel Jara, Patricio Andrés; Astaburuaga Peña, Juan Pablo; Villarroel del Pino, Luis A.; Torres Hidalgo, Marisa
Characterization of exposures in preschoolers reported to a Chilean Poison Control Center in 2020
(TAYLOR & FRANCIS LTD, 2023) Sateler Villanueva, Antonia; Bettini Silva, Marli Francesca; Silva Peña, Lorena Alejandra; Medel Jara, Patricio Andres; Iturra Montecinos, Pablo Andres; Figueroa Silva, Francisco Julio Antonio; Irarrazabal Vargas, Lisette Paola; Rios Bustamante, Juan Carlos
Clusters of Autoimmune Diseases in Children and the Role of PTPN22 C1858T Gene Polymorphism in Pediatric Polyautoimmunity
(2014) Borzutzky Schachter, Arturo; Seiltgens, Cristián; Iruretagoyena B., Mirentxu; Cristi, Francisca; Ponce, María Jesús ; Melendez, Patricia; Martínez Aguayo, Alejandro; Hodgson Bunster, María Isabel; Talesnik Guendelman, Eduardo; Riera Cassorla, Francisca Paz; Méndez, Cecilia; Harris D., Paul R.; García Bruce, Hernán; Gana Ansaldo, Juan Cristóbal; Godoy, Claudia; Cattani Ortega, Andreína
Background/Purpose:Autoimmune diseases (AIDs) have familial aggregation and frequently share a common genetic background, but few studies have evaluated autoimmune clusters in children with AIDs and their families. Children with more than one AID (pediatric polyautoimmunity) may have a stronger genetic component than children with a single AID. The objectives of this study were to identify clusters of AIDs in children and their first-degree relatives and to evaluate the association of PTPN22 C1858T gene polymorphism with pediatric polyautoimmunity.Methods:A cross-sectional study was performed in subjects with an AID of pediatric onset (<18 years)recruited at Pediatric Rheumatology, Endocrinology and Gastroenterology Clinics at the Health Network of the Pontificia Universidad Católica de Chile School of Medicine. Clusters of AIDs were identified by K-means cluster analysis. The PTPN22 C1858T gene polymorphism was determined by RT-PCR in subjects with pediatric polyautoimmunity and in subjects with three common AIDs: juvenile idiopathic arthritis (JIA), autoimmune thyroid disease (AITD), and type I diabetes (T1D).Results:191 subjects with pediatric AIDs were included, of which 45 (24%) had polyautoimmunity. Mean age was 12.1 years (range 1–19) and 68% were female. Most frequent AIDs were JIA (36%), AITD (25%), T1D (19%), uveitis (8%), celiac disease (6%), and vitiligo (6%). 59% of subjects with pediatric autoimmunity had first-degree relatives with an AID. Five clusters of AID were identified in families of children with autoimmunity (Table 1). Among the 45 subjects with pediatric polyautoimmunity, four clusters of AIDs were identified (Table 2). Genomic DNA from 128 subjects was evaluated for PTPN22 C1858T gene polymorphism revealing common homozygosity (C/C) in 85.2%, heterozygosity (C/T) in 13.3%, and rare homozygosity (T/T) in 1.6 %, in equilibrium with Hardy Weinberg equation (P = 0.4). 26% of polyautoimmune subjects had the T allele in contrast with 11% of monoautoimmune subjects (P = 0.04). No significant difference was found in the age of onset of autoimmunity between mono and polyautoimmune subjects (P = 0.44) or between subjects with C/C genotype vs. C/T and T/T genotypes (P = 0.81).
Collaborative health resources management model
(IEOM Society, 2021) Gutierrez, Janus, Amaru Leonhardt; Tabilo, Macarena Paz Navarro; Klapp Belmar Mathias Alberto
© IEOM Society Inweternational.In Chile, rural population faces long access times to specialized health services, as these tend to be concentrated in regional capitals. Against this background, the present study proposes the establishment of a Collaborative Health Resources Management Model, based on the practice of sharing hospital resources between medical centers, allowing daily transfers of doctors and medical equipment within a hospital network. The objective is to meet local demand and increase rural accessibility to healthcare, in terms of reducing patient transfers between hospitals and access times. To compare the current and proposed scenarios, an Integer Optimization Model with a Network Structure is formulated. The case study is focused on urology specialty in Zona del Reloncaví, a rural area located in southern Chile, on which it is concluded that allowing the mobility of hospital resources, specifically doctors and equipment, is optimal, as the average number of patient transfers and the average access time are reduced by 95.6% and 83%, respectively. By applying this model, hospitals are able to stretch their limited capital budgets by jointly purchasing equipment, providing network-wide access to resources needed for expanding healthcare accessibility.
CORE: a Complex Event Recognition Engine
(HUMANA PRESS INC, 2022) Bucchi M.; Grez A.; Quintana A.; Riveros C.; Vansummeren S.
© 2022, VLDB Endowment.Complex Event Recognition (CER) systems are a prominent technology for finding user-defined query patterns over large data streams in real time. CER query evaluation is known to be computationally challenging, since it requires maintaining a set of partial matches, and this set quickly grows super-linearly in the number of processed events. We present CORE, a novel COmplex event Recognition Engine that focuses on the efficient evaluation of a large class of complex event queries, including time windows as well as the partition-by event correlation operator. This engine uses a novel automaton-based evaluation algorithm that circumvents the super-linear partial match problem: under data complexity, it takes constant time per input event to maintain a data structure that compactly represents the set of partial matches and, once a match is found, the query results may be enumerated from the data structure with output-linear delay. We experimentally compare CORE against state-of-the-art CER systems on real-world data. We show that (1) CORE’s performance is stable with respect to both query and time window size, and (2) CORE outperforms the other systems by up to five orders of magnitude on different workloads.

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