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Calibration methodology for microscopic traffic simulation models of land ports of entry along the US-Mexico border

International Journal of Modeling, Simulation, and Scientific Computing 2020年第3期11卷 40-59页

作者： david salgado Peter T.Martin Abhisek Mudgal Rafael M.Aldrete Texas A&M Transportation Institute 4050 Rio Bravo Drive Suite 212El Paso 79912USA New Mexico State University Engineering Complex II Rm.215Las Cruces 88003USA Indian Institute of Technology(BHU)Civil Engineering Department Varanasi 221011 Uttar PradeshIndia

Non-commercial Land Ports of Entry(LPOEs)are unique transportation facilities controlling the ingress and egress of passenger vehicles from Mexico to the United States and vice *** calibration of microscopic traffic simulation models of non-commercial LPOEs requires a deep understanding of operational processes and driving behavior at these *** paper provides a methodology to guide modelers in calibrating microscopic traffic simulation models of non-commercial *** methodology establishes a common framework for modeling operational processes and traffic ***,the methodology includes the value of four state variables that characterizes operations of passenger vehicles at non-commercial *** variables are speed,acceleration,deceleration,and *** authors evaluated this methodology using the Otay Mesa non-commercial LPOE as a case *** showed that this methodology could be potentially used to model non-commercial LPOEs along the US-Mexico border and other border regions worldwide.

关键词： Land port of entry microsimulation calibration traffic models car-following models state variables

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行星齿轮传动自锁条件

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传动技术 2009年第4期23卷 28-38页

作者： david R.salgado J.M.del Castillo 谷雨 Department of Electronics and Electromechanical Engineering University of Extremadura

本文目标是确定一单自由度行星传动满足的自锁的条件。把全部行星传动最多考虑成6个构件,结果我们显示行星齿轮传动出现自锁的结构解。不像其他研究,它根据一个传动系变换其输入和输出轴产生的传动效率建立的分析式,系统求出自锁条件。... 详细信息

本文目标是确定一单自由度行星传动满足的自锁的条件。把全部行星传动最多考虑成6个构件,结果我们显示行星齿轮传动出现自锁的结构解。不像其他研究,它根据一个传动系变换其输入和输出轴产生的传动效率建立的分析式,系统求出自锁条件。最后,证明了该两效率之间近似关系。

关键词：行星齿轮传动自锁条件自由度效率

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Small-signal Model for Dual-active-bridge Converter Considering Total Elimination of Reactive Current

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Journal of Modern Power Systems and Clean Energy 2021年第2期9卷 450-458页

作者： Juan Ramon Rodriguez-Rodriguez Nadia Maria salgado-Herrera Jacinto Torres-Jimenez Nestor Gonzalez-Cabrera david Granados-Lieberman Martin Valtierra-Rodriguez the Universidad Nacional Autonoma de Mexico Facultad de IngenieriaDepto.Energia Electri-ca.Av.Universidad 3000Col.UNAM CUCoyoacanCDMXMexico the Instituto de Energias Renovables Universidad Nacional Autonoma de MexicoPriv.Xochicalco s/nCol.Centro.TemixcoMorelosMexico the Instituto Tec-nologico Superior de Irapuato Carretera Irapuato-Silao km 12.5.IrapuatoGuanajuatoMexico the Universidad Autonoma de Queretaro Campus San Juan del RioRio Moctezuma 249San Juan del RioQueretaroMexico

Emerging technologies such as electric vehicles,solid-state transformers,and DC transformers are implemented using the closed-loop bi-directional dual-active-bridge(DAB)*** this context,it is necessary to have average models that provide an efficient way of tuning the proportional integral(PI)compensator parameters for large-and small-signal *** present a novel small-signal model(SSM)for DAB converter with a single closed-loop PI controller and the total elimination of reactive current(IQ=0).The method applies a modulation technique for IQ=0 and introduces a composite function in the controller while reducing the original nonlinear switching model,which allows to decrease the order of the transfer function and analyze the closed-loop *** proposed SSM is analyzed using different response time,load,and DC voltage *** simulation and experimental results demonstrate the ease of implementation and effectiveness of the proposed model with respect to other SSM techniques.

关键词： Small-signal model(SSM) dual-active-bridge(DAB)converter reactive current elimination proportional integral(PI)control

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Determining a Diagnostic Cut-Off on Fluorescence Polarization Assay(FPA)for Bovine Brucellosis in Carchi,Ecuador

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Open Journal of Animal Sciences 2017年第4期7卷 425-432页

作者： Ibarra Marcelo Benavides Hernan salgado Ruth Gutierrez Milena Garcia Judith Pena Julio Herrera david Mina Jorge Campos Martin Puga Byron Agricultural Career Carchi State Polytechnic UniversityTulcánEcuador School of Veterinary Medicine and Animal Science Central University of EcuadorQuitoEcuador

Serology is the foundation of any brucellosis control and eradication program worldwide, thus it is important to define accuracy diagnostics assays and cut-off of those assays, due to variations from country to country and even among specific areas in the country. The variation of cutoff values depended on: prevalence of disease, vaccination status, animal management, and control and eradication programs. Therefore, a cut-off for the diagnosis of bovine brucellosis through fluorescence polarization assay (FPA) in Carchi—Ecuador was determined. The survey has been carried out in Carchi province of Ecuador, who is considered a province of high prevalence of brucellosis and the vaccination status is unknown due to the lack of registers. Sera samples (n = 200) were obtained from individual cows from randomly selected herds. Blood sera were tested through Fluoresce Polarization Assay (FPA) and competitive enzyme-linked inmunosorbent assay (cELISA) as confirmatory test, and then receiver operating characteristic (ROC) analysis was done. The sensitivity and specificity values of FPA were 88.7% and 92.50% respectively using a cut-off of 89.90 mP. Moreover, the area under the curve showed that 92.2% is the probability accuracy of the test. The advantage of the FPA is that it is a test with good characteristics of sensitivity and specificity as well as a simple and quick test.

关键词： Brucella Diagnosis Fluorescence Polarization Sensitivity Specificity

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Three-Dimensional Conformal and Intensity Modulated Dynamic Radiotherapy in Juvenile Nasopharyngeal Angiofibroma

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International Journal of Otolaryngology and Head & Neck Surgery 2023年第4期12卷 269-278页

作者： María Fátima Chilaca Rosas david Rafael Salazar Calderon Manuel Tadeo Contreras Aguilar Carlos Eduardo Barrios Merino Melissa García Lezama Benjamín Conde Castro Shelley Astrid Martínez Torres Katia Hernández salgado Rafael Medrano Guzmán Radiotherapy Department Oncology Hospital of National Medical Center s. XII Mexican Social Security Institute Mexico City Mexico Directorate of Research General Hospital of Mexico “Dr. Eduardo Liceaga” Mexico City Mexico Research Department in Imaging “Salud Digna” Mexico City Mexico Directorate Oncology Hospital of National Medical Center s. XII Mexican Social Security Institute Mexico City Mexico

Objective: Juvenile Nasopharyngeal Angiofibroma (JNA) is a benign neoplasm with a high vascularity component, greater craniofacial involvement in adolescent patients, and aggressive local behaviour. In unresectable patients, radiotherapy is a therapeutic option for local control. Our aim in this study was to analyze the clinical benefit and local control provided by two modalities of radiotherapy: the Three-Dimensional Conformal (3DC) technique and volumetric modulated arc therapy (VMAT), applied to pediatric patients with JNA considered unresectable and non-recurrent. Methods: In retrospective study, the information was recorded from pediatric patients with a diagnosis of non-recurrent and unresectable JNA treated with radiotherapy at the Oncology Hospital of the National Medical Center SXXI of Mexico City, from March 2010 to March 2021. Radiotherapy management and its association with clinical outcomes of tumour control, and symptoms were assessed. In addition, an evaluation of acute and chronic toxicity was performed. Results: It was found that the median age was 14 years. 9 patients (37.5%) underwent 3DC and 15 (62.5%) VMAT. In terms of local control, and progression-free survival, we did not find significant difference between radiotherapy modalities (p ≤ 0.57). Acute toxicity for both modalities presented statistical differences for radio epithelitis (p = 0.03). Only Grade I and II radiation-induced acute toxicity was observed. Regarding chronic toxicity, statistical significance was observed for craniofacial hypoplasia, in relation to its absence in the VMAT group (p = 0.001). Conclusion: The VMAT presents improvements in dosimetry parameters that improve patient toxicity. In both techniques adequate tumour control was observed, however, the rarity of the disease is a limitation to establish the most appropriate therapeutic technique.

关键词： Intensity-Modulated Radiotherapy Nasopharyngeal Angiofibroma Pediatric Radiotherapy Toxicity

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