• 3D semi-analytical solution of hygro-thermo-mechanical multilayered doubly-curved shells

      Monge, J. C.; Mantari, J. L.; Arciniega, R. A. (Elsevier Ltd, 2022-04-01)
      In this paper, a three-dimensional bending solution of doubly-curved shells subjected to mechanical, thermal and hygrothermal load is studied. Through-the-thickness temperature of the shell is modeled by Fourier's heat conduction equation. Fick's moisture diffusion law equation is used to determine the hygro-thermal profile through-the-thickness. The partial differential equations are solved by using the Navier closed form summations which are valid only for shells with constant radii of curvature among the midsurface and with simply supported boundary conditions on its shell's edges. The shell governing equations are solved by discretizing the thickness profile via Legendre's grid distribution and by using the Differential Quadrature Method (DQM). The Layerwise capabilities of the method is guaranteed by imposing the inter-laminar continuity of out-of-the-plane stresses, displacements, temperature and hygrothermal load thickness profile. The zero-stress condition for the transverse shear stresses is imposed due to the fact that no mechanical loads are applied in those directions. Results for cylindrical, spherical panels and rectangular plates are presented. Comparisons are made with Layerwise and three-dimensional solutions available in literature. The results have strong accuracy and a benchmark problem is delivered.
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    • 5S hybrid management model for increasing productivity in a textile company in Lima

      Neyra, Juanirene; Muñoz, José; Eyzaguirre, Juan; Raymundo, Carlos (Springer Verlag, 2020-01-01)
      In general, lean strategies in the textile sector are applied in production to improve productivity, reduce production time, and reduce errors, among other aspects. However, there are also documented studies, which are not common in the literature that uses these strategies to improve storage operations. This study shows the implementation of the Lean 5S Hybrid tool in the warehouse of a textile company based in Lima. The objective of the implementation was to improve productivity in the warehouse, as there were high response times when searching for materials, which reduced production time, warehouse redistribution, better using available space, and being able to strategically locate main materials. The results revealed an increase in warehouse productivity 3.95 times the initial one, an Inventory Record Accuracy of 98.17%, a decrease in the requirement search time by 66.12% (from 25 to 8 min), and stock rotation of 6.22 times.
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    • 6TOC model for small wood furniture companies to increase machining productivity in Villa El Salvador industrial cluster

      Gutierrez, Leonel; Laredo, Jesus; Sotelo, Fernando; Raymundo, Carlos (Springer Verlag, 2020-01-01)
      This research article focuses on the application of the main engineering tools in the wood furniture manufacturing sector. It uses as an information source furniture companies of the industrial park of Villa El Salvador. Its objective is to implement 6TOC methodology based on LEAN philosophy, Six Sigma and restrictions theory, focusing on improvements to the bottleneck. Defines the product design as an ideal input for the planning and development of activities. Start to know the work environment: stations and functions, machines and tools, plant layout and ergonomics in order to increase productivity. Application of tools level operations for planning, control and execution of production. Resulted in the GDP in the year 2017 increased by 2.2%. However, the manufacturing sector of goods decreased by 5.5%, that is, it impairs GDP growth, since the wood and furniture industry, which had an aggregate gross manufacturing value of −19.9%.
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    • A 12-month clinical trial examining the effects of a surface sealant on Class I composite resin restorations.

      Nahsan, Flavia Pardo Salata; Wang, Linda; Modena, Karin Silva; Francisconi Dos Rios, Luciana Fàvaro; Silva, Luciana Mendonça da; Calabria, Marcela Pagani; Casas-Apayco, Leslie; Mondelli, Rafael Francisco Lia (Chicago, Academy of General Dentistry, 2016-03)
      A split-mouth, double-blind trial evaluated the effects of a surface sealant on the clinical performance of Class I composite resin restorations. In 16 patients, 27 pairs of maxillary and mandibular molars or premolars with Class I carious lesions or unsatisfactory restorations were restored with composite resin. For each pair, 1 surface was sealed with surface sealant. Clinical evaluations of marginal integrity, marginal discoloration, anatomical form, and secondary caries were performed by 2 experienced operators using modified US Public Health Service criteria 1-2 weeks and 6 and 12 months after treatment. Data were analyzed with the McNemar test (P < 0.05). After 6 months, only 1 (4%) sealed restoration presented a Bravo rating for marginal integrity. After 12 months, the Bravo ratings for marginal integrity were 2 (7%) for sealed restorations and 1 (4%) for nonsealed restorations. Restorations received a score of Alfa for all other parameters at all time periods. There were no statistically significant differences within or between the sealed and nonsealed groups (P = 1.0). The use of a surface sealant did not improve the clinical performance of posterior composite resin Class I restorations.
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    • A biometric method based on the matching of dilated and skeletonized IR images of the veins map of the dorsum of the hand

      Universidad Peruana de Ciencias Aplicadas (UPC) (IEEE, 2015-06-02)
      This work proposes a biometric identification system that works together with a palm vein reader sensor and a hand-clenching support, designed to perform the capture the back of the hand. Several processing steps were performed: extraction of the region of interest, binarization, dilation, noise filtering, skeletonization, as well as extraction and verification of patterns based on the measurment of coincidence of vertical and horizontal displacements of skeletonized and dilated images. The proposed method achieved the following results: processing time post capture of 1.8 seconds, FRR of 0.47% and FAR of 0,00%, with a referential database of 50 people from a total of 1500 random captures.
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    • A comment on “Body image and paranoia”

      Jeri-Yabar, Antoine; Marin-Leiva, Javiera; Tejada, Romina A. (Elsevier Ireland Ltd, 2018-01)
      Cartas al Editor
    • A community randomised controlled trial evaluating a home-based environmental intervention package of improved stoves, solar water disinfection and kitchen sinks in rural Peru: Rationale, trial design and baseline findings

      Hartinger, S.M.; Lanata, Claudio F.; Hattendorf, J.; Gil, I.; Verastegui, H.; Ochoa, T.; Mäusezahl, D. (Elsevier B.V., 2015-03-24)
      Introduction: Pneumonia and diarrhoea are leading causes of death in children. There is a need to develop effective interventions. Objective: We present the design and baseline findings of a community-randomised controlled trial in rural Peru to evaluate the health impact of an Integrated Home-based Intervention Package in children aged 6 to 35 months. Methods: We randomised 51 communities. The intervention was developed through a community-participatory approach prior to the trial. They comprised the construction of improved stoves and kitchen sinks, the promotion of hand washing, and solar drinking water disinfection (SODIS). To reduce the potential impact of non-blinding bias, a psychomotor stimulation intervention was implemented in the control arm. The baseline survey included anthropometric and socio-economic characteristics. In a sub-sample we determined the level of faecal contamination of drinking water, hands and kitchen utensils and the prevalence of diarrhoegenic Escherichia coli in stool specimen. Results: We enrolled 534 children. At baseline all households used open fires and 77% had access to piped water supplies. E. coli was found in drinking water in 68% and 64% of the intervention and control households. Diarrhoegenic E. coli strains were isolated from 45/139 stool samples. The proportion of stunted children was 54%. Conclusions: Randomization resulted in comparable study arms. Recently, several critical reviews raised major concerns on the reliability of open health intervention trials, because of uncertain sustainability and non-blinding bias. In this regard, the presented trial featuring objective outcome measures, a simultaneous intervention in the control communities and a 12- month follow up period will provide valuable evidence.
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    • A Cost Analysis of Gyrase A Testing and Targeted Ciprofloxacin Therapy Versus Recommended 2-Drug Therapy for Neisseria gonorrhoeae Infection

      Allan-Blitz, Lao-Tzu; Hemarajata, Peera; Humphries, Romney M.; Wynn, Adriane; Segura, Eddy R.; Klausner, Jeffrey D. (Lippincott Williams and Wilkins, 2018-02)
      From the *Division of Infectious Diseases, Department of Medicine, †Department of Laboratory Medicine, David Geffen School of Medicine, Department of Medicine, ‡Fielding School of Public Health, University of California Los Angeles, Los Angeles, CA; §Escuela de Medicina, Universidad Peruana de Ciencias Aplicadas, Lima, Peru; and ¶Division of Infectious Diseases, Department of Medicine, University of California Los Angeles, Los Angeles, CA Conflict of Interest and Sources of Funding: None declared. This research was supported by the United States National Institutes of Health grants R21AI117256 and R21AI109005 as well as the South American Program in HIV Prevention Research NIH/NIMH R25MH087222. Correspondence: Lao-Tzu Allan-Blitz, MD Candidate, 2018, David Geffen School of Medicine, University of California Los Angeles, 10833 Le Conte Ave, Los Angeles, CA 90095. E‐mail: lallanblitz@mednet.ucla.edu. Received for publication February 21, 2017, and accepted July 30, 2017. DOI: 10.1097/OLQ.0000000000000698
    • A critical appraisal on the association and effects of magnesium and bone density on physical performance in elderly women.

      Unocc, Carla P; Valdez, Laura I; Segura, Eddy R.; laura_valdez25@hotmail.com (American Society for Nutrition, 2015-04)
      Cartas al editor
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    • A middle rate of failed extubation is desirable?: Questions unanswered (reply).

      Kapnadak, Siddhartha G; Herndon, Steve E; Burns, Suzanne M; Shim, Y Michael; Enfield, Kyle; Brown, Cynthia; Truwit, Jonathon D; Vinayak, Ajeet G; aracely.silva44@gmail.com (Elsevier B.V., 2015-12)
      Cartas al editor
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    • A Novel Steganography Technique for SDTV-H.264/AVC Encoded Video

      Di Laura, Christian; Pajuelo, Diego; Kemper, Guillermo (Hindawi Publishing Corporation, 2016-04)
      Today, eavesdropping is becoming a common issue in the rapidly growing digital network and has foreseen the need for secret communication channels embedded in digital media. In this paper, a novel steganography technique designed for Standard Definition Digital Television (SDTV) H.264/AVC encoded video sequences is presented. The algorithm introduced here makes use of the compression properties of the Context Adaptive Variable Length Coding (CAVLC) entropy encoder to achieve a low complexity and real-time inserting method. The chosen scheme hides the private message directly in the H.264/AVC bit stream by modifying the AC frequency quantized residual luminance coefficients of intrapredicted I-frames. In order to avoid error propagation in adjacent blocks, an interlaced embedding strategy is applied. Likewise, the steganography technique proposed allows self-detection of the hidden message at the target destination. The code source was implemented by mixing MATLAB 2010 b and Java development environments. Finally, experimental results have been assessed through objective and subjective quality measures and reveal that less visible artifacts are produced with the technique proposed by reaching PSNR values above 40.0 dB and an embedding bit rate average per secret communication channel of 425 bits/sec. This exemplifies that steganography is affordable in digital television.
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    • A population-based study of cervical cytology findings and human papillomavirus infection in a suburban area of Thailand

      Phoolcharoen, Natacha; Kantathavorn, Nuttavut; Sricharunrat, Thaniya; Saeloo, Siriporn; Krongthong, Waraphorn (Elsevier B.V., 2017-08)
      Cartas al Editor
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    • A randomised controlled trial to evaluate a medication monitoring system for TB treatment

      Acosta, J.; Flores, P.; Alarcón, M.; Grande-Ortiz, M.; Moreno-Exebio, L.; Puyen, Z. M. (International Union Against Tuberculosis and Lung Disease, 2022-01-01)
      BACKGROUND: Adherence to TB treatment and therefore treatment success could be improved using digital adherence technology. OBJECTIVE: To evaluate the effectiveness of a medication event reminder monitor system (MERM) on treatment success and treatment adherence in patients with drug-susceptible pulmonary TB in Perú. METHODS: This was an experimental, randomised, open-label, controlled study conducted among patients in the second phase of TB treatment. The intervention group received their medications through MERM with the support of a treatment monitor, whereas the control group used the usual strategy. Participants were followed until they completed the 54 doses of the second phase of treatment. RESULTS: The study included 53 patients in each group; four in the intervention group withdrew from the study. Treatment success was significantly more frequent in the MERM group (RR 1.15, 95% CI 1.02–1.30; P = 0.0322). There was no significant difference in the adherence outcomes; however, the percentage of patients who missed at least one dose and patients with more than 10% of total doses missed were lower in the intervention group. CONCLUSION: The use of MERM in the second phase of treatment showed a significant improvement in the treatment success rate in patients with drug-susceptible pulmonary TB.
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    • A Shocking Cystory

      Cayo Quiñe, Alexandra; Bustamante Voysest, Rossi; Martínez Vargas, Valeria (Elsevier B.V., 2015-04-09)
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    • A study on online intervention for early childhood eating disorders during COVID-19

      Cimino, Silvia; Almenara, Carlos A.; Cerniglia, Luca (MDPI, 2022-03-01)
      Eating disorders are among the most common clinical manifestations in children, and they are frequently connected with maternal psychopathological risk, internalizing/externalizing problems in children, and poor quality of mother–child feeding exchanges. During the COVID-19 lockdown, in person assessment and intervention were impeded due to the indications of maintaining interpersonal distancing and by limits to travel. Therefore, web-based methods were adopted to meet patients’ needs. In this study N = 278 participants completed the SCL-90/R and the CBCL to examine the psychopathological symptoms of mothers and children (age of the children = 24 months); moreover, the dyads were video-recorded during feeding and followed an online video-feedback based intervention. Maternal emotional state, interactive conflict, food refusal in children, and dyadic affective state all improved considerably, as did offspring internalizing/externalizing problems and mothers’ depression, anxiety, and obsession–compulsion symptoms. This study showed that video-feedback web-based intervention might be employed successfully to yield considerable beneficial effects. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.
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    • A systematic review and meta-analysis of the relative efficacy and safety of treatment regimens for HIV-associated cerebral toxoplasmosis: is trimethoprim-sulfamethoxazole a real option?

      Hernandez, Adrian V.; Thota, P; Pellegrino, D; Pasupuleti, V; Benítes-Zapata, Vicente A.; Penalva de Oliveira, AC; Vidal, JE; Deshpande, Abhishek; School of Medicine; Universidad Peruana de Ciencias Aplicadas (UPC); Lima Peru; Department of Medicine; Case Western Reserve University; Cleveland OH USA; Department of Infectious Diseases; Instituto de Infectologia Emilio Ribas; Sao Paulo Brazil; Department of Medicine; Case Western Reserve University; Cleveland OH USA; Center for Public Health Research; Research Institute, Faculty of Medicine; Universidad de San Martin de Porres; Lima Peru; Medicine Institute Center for Value Based Care Research; Cleveland Clinic; Cleveland OH USA; Department of Neurology; Instituto de Infectologia Emilio Ribas; Sao Paulo Brazil; Department of Neurology; Instituto de Infectologia Emilio Ribas; Sao Paulo Brazil (Blackwell Publishing Ltd, 2017-02)
      OBJECTIVES: The objective of this study was to perform a systematic review and meta-analysis of the literature to evaluate the efficacy and safety of therapies for cerebral toxoplasmosis in HIV-infected adults. The pyrimethamine plus sulfadiazine (P-S) combination is considered the mainstay therapy for cerebral toxoplasmosis and pyrimethamine plus clindamycin (P-C) is the most common alternative treatment. Although trimethoprim-sulfamethoxazole (TMP-SMX) has potential advantages, its use is infrequent. METHODS: We searched PubMed and four other databases to identify randomized controlled trials (RCTs) and cohort studies. Two independent reviewers searched the databases, identified studies and extracted data. Risk ratios (RRs) were pooled across studies using random-effects models. RESULTS: Nine studies were included (five RCTs, three retrospective cohort studies and one prospective cohort study). In comparison to P-S, treatment with P-C or TMP-SMX was associated with similar rates of partial or complete clinical response [P-C: RR 0.87; 95% confidence interval (CI) 0.70-1.08; TMP-SMX: RR 0.97; 95% CI 0.78-1.21], radiological response (P-C: RR 0.92; 95% CI 0.82-1.03), skin rash (P-C: RR 0.81; 95% CI 0.56-1.17; TMP-SMX: RR 0.17; 95% CI 0.02-1.29), gastrointestinal impairment (P-C: RR 5.16; 95% CI 0.66-40.11), and drug discontinuation because of adverse events (P-C: RR 0.32; 95% CI 0.07-1.47). Liver impairment was more frequent with P-S than P-C (P-C vs. P-S: RR 0.48; 95% CI 0.24-0.97). CONCLUSIONS: The current evidence fails to identify a superior regimen in terms of relative efficacy or safety for the treatment of HIV-associated cerebral toxoplasmosis. Use of TMP-SMX as preferred treatment may be consistent with the available evidence and other real-world considerations. Larger comparative studies are needed.
    • Abandono de la terapia nutricional y pérdida de peso en pacientes bariátricos: Cohorte retrospectiva en Lima, Perú

      Giacchetti-Vega, Monica; Baquerizo-vonBerswordts, Pamela; Carbone-Moane, Camila; Bernabe-Ortiz, Antonio; m.giacchetti4@gmail.com (Fundación Española de Dietistas-Nutricionistas (FEDN), 2017-04-04)
      Introduction: The aims of this study were to determine the proportion of patients who meet international recommendations for bariatric surgery and to assess the association between weight loss and dropout rate during diet therapy. Material and Methods: Retrospective cohort study performed using data from clinical records of patients who underwent sleeve gastrectomy in a private clinic of Lima, Peru. Two outcomes were evaluated, eligibility for bariatric surgery according to international recommendations (BMI≥40kg/m2 or ≥35kg/m2 with comorbidities) and abandonment before and after starting nutritional management (no nutritional assessment after 60 days from the previous visit without achieving ideal BMI). The exposure was the percentage of weight lost in the first five weeks after surgery split into <10% and ≥10%. Poisson regression was used and relative risks and 95% confidence intervals (95%CI) were calculated. Results: Data from 423 medical records of bariatric patients, mean age 39.2 years (±12.3), 294 (69.5%) women, were analyzed. Only 117 (27.7%) patients met international recommendations for bariatric surgery. Before starting nutritional management, 48/117 (41%) abandoned treatment, whereas an additional 29/69 (42.0%) abandoned before six months of nutritional management. Patient losing ≥10% of weight in the first month had 90% lower risk (RR=0.10; 95%CI:0.01-0.68) of nutritional therapy dropout compared to those who lost <10% of weight, controlling for sex and age. Conclusions: A great proportion of patients undergoing bariatric surgery did not meet the international criteria. A greater loss of weight during the first month was associated a lower dropout rate during nutritional therapy.
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    • About «Factors determining irregular attendance to follow-up visits among human immunodeficiency virus patients: Results of a hospital survey of patients infected with human immunodeficiency virus, 2002-2012»

      Guillermo Ladera, Dayana Sianny; Ventocilla Gonzales, Iris Janet; iris.vg.30@gmail.com (Elsevier B.V., 2016-04)
      Cartas al editor
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    • Acciones de prevención y control de la legionelosis: un reto para la salud pública española.

      Gea-Izquierdo, Enrique; Mezones-Holguín, Edward; Haro-García, Luis (Instituto Nacional de Salud (INS), 2014-03-20)
      La legionelosis es una enfermedad respiratoria con origen en sistemas que formen aerosol y que contenga el agente biológico Legionella sp. En las últimas décadas se ha desarrollado en España un marco normativo para su prevención y control. El presente artículo expone la epidemiología de la legionelosis y la importancia del control de la transmisión de la bacteria en la lucha contra la enfermedad. Para ello, se hace patente la revisión de las instalaciones críticas y la inclusión de otras nuevas en la legislación preventiva así como la estimación del riesgo, la mejora en los procesos de diagnóstico y el avance en nuevos protocolos de prevención.
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    • Aceptabilidad del sabor de preparaciones hiposódicas con sustitutos de sal en pacientes diabéticos e hipertensos

      Ayerbe-Azabache, Angela; Calderón-Ramírez, Nancy; Taboada,Marco; Mayta-Tristan, Percy; angela_ayer@hotmail.com (2016-12)
      l objetivo de este estudio experimental fue comparar la aceptabilidad del sabor entre diferentes preparaciones con bajo contenido de sodio en pacientes diabéticos e hipertensos. Se realizó entre abril y mayo del 2015 en el Centro de Atención Integral de Diabetes e Hipertensión (CEDHI) en Lima, Perú. Las personas evaluadas fueron 67 pacientes ambulatorios del CEDHI, mayores de 18 años de ambos géneros, diagnosticados de hipertensión arterial o diabetes tipo 2. En total fueron aplicadas 134 pruebas sensoriales y 402 muestras preparadas. Las preparaciones que fueron sometidas a evaluación fueron arroz, caldo, pollo y verduras cocidas, adicionándoles sal común, cloruro de potasio [25%] con sal común [75%] y glutamato monosódico. Para medir los resultados se utilizaron dos pruebas hedónicas, de preferencia por ordenamiento y prueba de aceptabilidad (puntuación del 1 al 5). En los resultados no se encontraron diferencias significativas a nivel global en cuanto a la aceptabilidad y preferencia de las preparaciones con bajo contenido de sodio. Por lo cual, el reemplazo de la sal común por cualquiera de los sustitutos es viable para pacientes con prescripción de dieta hiposódica (1500 mg Na/día).
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