bluuebunny/crossref_metadata_2025 huggingface dataset:
The Connection Between Intuition and Decision-Making Styles
Authors:   Ural Federal University, Permiakova Margarita E. , Ershova Irina A. ,   Ural Federal University, Permiakov Mikhail N. ,   Ural Federal University
Published: September 2023

The results of the study of the connection between intuition and decision­making styles regarding men and women are presented in the following paper. Correlation analysis demonstrated the presence of specific associations: speaking about men, who generally rate their intuitive ability higher if compared to women, there are dependences with the characteristics of intuition, indicating their propensity for an intuitive decision­making style; speaking about women, there is a correlation between characteristics of intuition and indicators of rationality in decision-making.
Settlement of Non-Ethnic Migrants as a Factor of Cultural Integration With the Host Community
Authors:   Ural Federal University, Britvina Irina B.
Published: September 2023

The article analyzes the problem of resettlement of migrants from Central Asian countries in Russian cities using the example of the city of Ekaterinburg. The author shows the positive role of the diffuse type of settlement in the cultural integration of migrants referring to the results of surveys of Yekaterinburg residents and non­ethnic migrants. The creation of migrant enclaves within Russian cities creates precedents for misunderstanding between locals and newcomers in relation to each other.
Theoretical and Methodological Bases for Analysis of the Influence of Opinion Leaders in the Online Environment
Authors:   Udmurt State University, Makarova Marina N. , Ladyzhets Natalya S. ,   Udmurt State University
Published: September 2023

The main purpose of the article is to search for the possibilities of applying classical and postclassical models of social network analysis to leadership research. In modern conditions, opinion leaders become strategically important, having the capabilities of both local and dispersed association of supporters to achieve socially significant goals, and aggravating the risks of destructive antisocial consolidation. The novelty of the proposed study is due to the fact that it presents a comprehensive analytical conceptualization of the influence of social network opinion leaders, as well as identification technology and control in various areas of modern digital society.
Development of Handball Academy Korea Physical Fitness Test Model for Youth Handball Players
Authors: Kim MinKi , Park Jong Chul , Ahn Jee Hwan , Park Soo Hyun
Published: September 2023

PURPOSE: This study aimed to develop a Handball Academy Korea Physical Fitness Test Battery for youth handball athletes considering their characteristics using the Delphi/AHP method.METHODS: After reviewing previous studies, an expert meeting was held to draft a battery. To select physical fitness variables, 17 experts with more than 10 years of research or coaching experience in related fields were invited. The contact validity of each variable was verified using the 1st and 2nd Delphi surveys. A decision-making method based on the analytic hierarchy process (AHP) was used to assign weights to each factor in the final physical fitness battery, which was selected based on the results of the Delphi survey.RESULTS: Ten physical fitness factors, namely, length (CVR=1.00), weight (CVR=0.67), muscle strength (CVR=0.67), muscular endurance (CVR=0.83), cardiorespiratory fitness (CVR=0.83), flexibility (CVR=0.67), power (CVR=1.00), agility (CVR=1.00), speed (CVR=0.80), coordination (CVR=1.00), were determined. As test variables for physical fitness, height (CVR=0.83), arm span (CVR=0.67), lean body mass (CVR=0.64), handgrip strength (CVR=0.83), push-up (CVR=0.67), 20 m shuttle run (CVR=1.00), sitand-reach (CVR=0.83), standing long jump (CVR=0.76), countermovement jump (CVR=0.67), ball speed (CVR=0.67), rollercoaster run (CVR=0.83), visual reaction (CVR=0.83), 20 m sprint (CVR=0.83), and ball handling (CVR=0.67) were found to be valid. Weight was calculated according to the relative importance of the determined variables.CONCLUSIONS: The present findings indicate that the Handball Academy Korea Physical Fitness Test Battery can be used to evaluate the physical fitness of youth handball athletes and select potential players.
CARACTERIZAÇÃO DOS ÓBITOS POR SUICÍDIO DOS INTEGRANTES DA POLÍCIA CIVIL DO DISTRITO FEDERAL
Authors: Messina Alvim Flávio
Published: September 2023

Objetivo: descrever a frequência, a distribuição anual, a idade, o cargo ocupado e as principais características de suicídio dos integrantes da Polícia Civil do Distrito Federal ocorrido no espaço geográfico do Distrito Federal. Métodos: estudo descritivo e transversal que inclui todos os óbitos que tenham ocorrido por suicídio consumado no período de 01/01/2013 a 31/12/2022 entre a população pesquisada. A análise compreendeu a descrição dos casos, verificação da distribuição das informações sociodemográficas e o cálculo da taxa anual de mortalidade. Resultados: Foram apurados 19 óbitos causados por suicídio entre todos os policiais civis do Distrito Federal, observando-se 17 suicídios entre policiais civis do sexo masculino (89,47%), com uma maior ocorrência de suicídios cometidos em casa (68,42%), por pessoas na faixa etária entre 33 a 59 anos (84,21%), por indivíduos casados (73,69%), que ainda estavam em plena atividade profissional (57,89%) e com uso de arma de fogo como método principal (57,89%). Dos casos de suicídio, a maioria foi cometido por agentes de polícia (89,48%). Conclusão: constatou-se, nos últimos anos, altas taxas de suicídio entre os policiais civis do Distrito Federal, havendo a necessidade de aprofundamento dos estudos sobre a saúde mental desse grupo ocupacional, inclusive como forma de contribuir para a adoção de medidas preventivas que propiciem a redução do risco de suicídio.
ESTUDO DE CASO SOBRE O CONSELHO NACIONAL DOS DIREITOS DA CRIANÇA E DO ADOLESCENTE – CONANDA E O CONSELHO NACIONAL DE COMBATE À DISCRIMINAÇÃO – CNCD NA ERA JAIR BOLSONARO (2019-2022)
Authors: Silva Beatriz , Araujo Rafael
Published: September 2023

As Instituições Participativas estavam em movimento crescente no Brasil, mas, a participação social foi atacada e começou a apresentar sinais de fraqueza em 2014, quando a Política Nacional de Participação Social foi vetada pelo Congresso Nacional sob argumentos pífios. Nos primeiros meses de governo Bolsonaro, o Decreto 9759/19 extinguiu órgãos colegiados criados por instrumentos legais inferiores e um colegiado atingidos foi o Conselho Nacional de Combate à Discriminação – CNCD. Criado em 2001 a partir do Decreto 3952/01 seu objetivo era promover direitos sociais de vítimas de discriminação racial ou outra forma de intolerância e em 2010 o Decreto 7388/10 incluiu na competência do CNDC a promoção e defesa dos direitos da comunidade LGBTI+. O CONANDA não foi diretamente extinto, mas sofreu esvaziamento a partir do Decreto 10.003/19. Partindo da pesquisa qualitativa, que nos permite interpretar o mundo social, utilizamos a metodologia de análise documental com o intuito de realizar um estudo de caso sobre os dois conselhos, e concluímos que após uma trajetória de visibilidade e manejo de políticas públicas, a supressão de tal espaço de debate público levou ao retrocesso de direitos, fato que reforça nosso argumento de que a manutenção das instituições participativas é fundamental para o fortalecimento da democracia.
Effects of a two-phase mixing process on warm-mix asphalt by factorial analysis
Authors: Behera Hemanta Kumar , Das Sudhanshu Sekhar , Giri Debabrata
Published: September 2023

Warm-mix asphalt (WMA) was produced using a two-phase mixing process without additives, with bitumen–emulsion-coated aggregates and with bitumen at different mixing temperatures (MTs). The asphalt samples were prepared with 8% ground granulated blast-furnace slag fillers determined from hot-mix asphalt (HMA) analysis, with different bitumen-to-emulsion ratios and different MTs. Using the factorial design technique, the effects of the selected factors on Marshall performance parameters were investigated using interaction plots and main effect plots. The analysis from contour plots revealed that WMA prepared at 120°C with a bitumen-to-emulsion ratio of 80:20 performed best, with indirect tensile strength, tensile strength ratio, retained stability, rutting tests and ravelling loss values all meeting the standard code limits. Compared with HMA, the chosen WMA had a 37% lower ravelling loss.
Exploration of highway accidents temporal changes using traffic and climate big data
Authors: Park Donghyeok , Kwon Kyeongjoo , Park Juneyoung
Published: September 2023

Anthropogenic emissions of greenhouse gases accelerate global warming and contribute to further temperature increases. Global warming increases the likelihood of a shift towards more warm days and seasons and fewer cold days and seasons. Additionally, it causes changes in precipitation patterns. In earlier research, as ambient temperatures increase, cognitive performance decreases and the risk of crashing increases. Earlier, crash-frequency models were developed using various methodologies, but time-series crash-frequency prediction studies considering the effects of climate change are scarce. Therefore, the purpose of this study is to identify the correlation between crashes and climate change using big data and to develop crash-frequency models using an econometric model and a deep-learning model. Econometric models use autoregressive-integrated moving average and autoregressive-integrated moving average with exogenous variable that are traditional time-series methodologies. Deep-learning models use long short-term memory. This study approached crash occurrence by comprehensively considering climate change and traffic factors. Also, it differs from earlier studies in detailing the influence of independent variables on crashes. Through the results, the impact of climate change on accidents can be identified and it can contribute as an engineering basis for improving traffic safety.
Environmental Scanning Practices of Managers in Oil and Gas Companies in Nigeria
Authors: Popoola Sunday , Fagbola Olaronke
Published: September 2023

This study was designed to investigate environmental scanning practices of the managers in Oil and Gas companies in Nigeria. Ex-post factor design and quantitative research approach were adopted to collect data from the respondents and the copies of the returned questionnaire were valid for analysis yielding 89.9 % response rate. The study revealed that customer, technological and regulatory sectors were the most perceived environmental uncertainty of the respondents. The amount of scanning done had significant correlation with perceived sector uncertainty of the respondents among others. The study recommended that the managers should consider enacting and searching as modes of scanning; perceived sector uncertainty, information sources accessibility and quality so as to enhance their frequency of use of information sources to scan their business environment.
Review of the type status of some Scarabaeoidea (Coleoptera) held by the Queensland Museum
Authors:   Queensland Museum, Allsopp Peter , Koch Karin
Published: September 2023

Where uncertainty is identified, the status of putative type specimens for 87 species group names of Scarabaeoidea (Coleoptera) housed in the Queensland Museum is reviewed. This can relate to outdated concepts and terminologies used in the descriptions, names that were not subsequently published, or material that was seen by the authors of the species but not listed in the original publication. Specimens are identified by their registry labels, labels summarising any changes to their status were attached to each specimen, and the museum’s electronic registers were updated. Full label data are given to allow future recognition.
3DRAM-seq enables joint epigenome profiling of spatial genome organization, chromatin accessibility and DNA methylation at high resolution v1
Authors: Noack Florian , Bonev Boyan
Published: September 2023

3DRAM-seq (3D genome, RNA, Accessibility and Methylation sequencing) is a novel multiomic method that simultaneously interrogates spatial genome organization, chromatin accessibility, DNA methylation and gene expression at high resolution. It utilized enzymatic treatment of bulk fixed nuclei with the GpC methyltransferase M.CviPI prior to restriction digestion, biotin fill-in and proximity ligation as in Hi-C. The resulting 3C DNA is then sheared to ~550bp, followed by bisulfite conversion and library preparation based on the Accel-NGS® Methyl-Seq DNA but using streptavidin beads after the adaptor ligation step to enrich for fragments containing informative contacts. 3DRAM-seq can be performed with as few as 200 000 cells and can be combined with immunoFACS to profile the epigenome landscape in a cell-type-specific manner.
Handling and Sampling Small Nonhuman Primates - ISL Peru v1
Authors: Watsa Mrinalini
Published: September 2023

Program Timing: Trap habituation begins in May. Trapping and sample collection occur annually during the rainforest dry season (June - August). Sample transport and analyses occur between September and April. Capture Overview: Entire primate social groups are captured together in multi-compartment traps in the morning to ensure same day release (~ 5 - 30 minutes depending on group sizes that range between 3 and 8 animals) -> animals are administered a small dose of anesthetic for trap extraction and 1st phase processing, then transferred to quiet, dark holding cages until 2nd phase processing (maximum holding cage time of 2 hrs for largest groups) -> one by one, animals are chemically restrained once more for 2nd phase processing for morphometric measurements, photographs, sample collection, and placement of animal identification (~ 25 minutes) -> animals recover in quiet, dark recovery cages during which 3-minute checks for breathing and movement occur until fully alert (1.5-2 h/animal since last injection of anesthetic) -> when the group is fully recovered from anesthetic all are released at the site of capture (< 5 minutes) -> group membership and well-being are confirmed with radio telemetry. Team Composition: This protocol is intended to be carried out by a team of no less than 4 individuals, including at least 2 experienced personnel. Roles include (1) veterinarian/senior researcher (2) designated animal handler (3) sampling assistant (4) data recorder. Refer to the PROCESSING ROLES section.
Organoid Electroporation using CRISPR RNP method v1
Authors: not provided mns
Published: September 2023

Organoid electroporation using ribonucleoprotein (RNP) CRISPR based approach for highly efficient genome editing.
LENGUAJE INTEGRADOR EN MANUELA: UNA PROPUESTA INCÓMODA
Authors: Castro Torres Juliana
Published: September 2023

A pesar de que fue la primera novela de gran magnitud de la Colombia independiente y de estar llena de aciertos, Manuela no tuvo un caluroso recibimiento de su primer público; tampoco ha tenido una fuerte presencia en la historia de la literatura colombiana. Uno de los aspectos más criticados de Manuela fue su lenguaje. Este artículo explora la propuesta de lenguaje de Manuela y aborda el problema de su recepción, analizando sus críticas y caracterizando su primer público lector.
Risk management in software development projects in Spain: a state of art
Authors: Fernández Sanz Luis , Bernad Silva Pedro
Published: September 2023

Software  is  today  a  critical  element  in  every  system.  The  development  and  implementation of computer programs is influenced by many varied risks which should be managed properly. Risk management in software projects is an activity addressed in several software methodologies, but the different workgroups and organizations  apply  it  in  practice  in  many  different  ways.  A  preliminary  study  has  been  conducted  among  Spanish  software  professionals  and  developers.  It  reveals interest in risk management and its techniques, but it also shows that serious deficiencies as well as attitudes which do not help to this activity. These preliminary data represent a basis for a deeper and more detailed analysis of risk management practices which might lead to more effective and practical solutions.
Software for design and implementation observers of Luenberguer lineal and high gain
Authors: Posada Restrepo Norha Ligia , Osorio Cárdenas Marisol , Castrillón Hernández Fabio
Published: September 2023

In this paper we present two software applications, one for simulation and design, and another for implementing Luenberguer Linear and High Gain observers. We show the interfaces and present a complete description of the software. The observers were designed for a system of tanks in cascade connected by a channel.  We present the mathematic model proposed for this system and the changes that we made in it to ensure the compliance of theory design conditions observers. Further, we make a brief presentation over theory design of observers with us work and basic concepts for their implementation.  The most relevant aspects for the programming algorithms used for simulation, design and implementation of observers are studied.  The software used for platforms design was Matlab® and LabVIEW®, and report of results for implementation was made in a file, .lvm. This kind of file can process with Matlab® or Excel®.
Reconstruction of the execution times dynamics of real-time tasks by fuzzy digital filtering
Authors: Valdez Martínez Jorge Salvador , Delgado Reyes Gustavo , Guevara López Pedro , García Infante Juan Carlos
Published: September 2023

Real-time systems (RTS) process their activities through tasks which in turn consist of a set of instances, each one of this real-time task (RTT) have six temporary  constraints:  arrival  time,  start  time,  execution  time,  end  time,  over time and deadline. Of these six constraints, the execution time depends directly on the software and hardware of the computer, because of that this temporary constraints varies due to external and internal factors, this variation may cause at least some instance does not satisfy the deadline, in this sense it is important to propose a model to reconstruct the behavior of the execution times for the purpose to determine the proportions of the Real-time System, propose  appropriate  techniques  of  fault  tolerance  and  improve  operating  modules.  Therefore  in  this  paper,  is  proposed  a  model  to  reconstruct  the  execution times from measurements made at a program algorithm developed in  the  real-time  operating  system  QNX  Neutrino  6.5.  This  reconstruction  is  done  by  a  model  type  autoregressive–moving-average  integrated  with  parameter  estimator  constructed  with  a  digital  filtering  procedure  diffuse (FDD).  To  validate  the  reconstruction  is  used  the  mean  square  error  which  converges  to  a  region  close  to  zero  and  indicate  that  the  reconstruction  is  good.
802.11g multilayer header compression for VoIP in remote rural contexts
Authors: Armenta Ramade Álvaro , Serrano Santoyo Arturo
Published: September 2023

This  article  presents  a  Multilayer  Header  Compression  scheme  for VoIP  packets  in  802.11  wireless  networks  that  does  not  require  context synchronization of compressor and decompressor units. The reduction of the header size is accomplished through the static field compression of the RTP/UDP/IP headers in conjunction with an 8 bit virtual addressing in the 802.11 MAC layer. Considering the RTP/UDP/IP/MAC header fields, this scheme allows  48%  header  compression  efficiency  compared  with  41%  provided by the CRTP and RoHC schemes. Given that our proposal does not require context synchronization, the decompressor will regenerate the headers even in high packet loss rate conditions.
Direct power control in grid-tied photovoltaic systems
Authors: Mantilla Villalobos María Alejandra , Petit Suárez Johann Farith , Ordóñez Plata Gabriel
Published: September 2023

This  paper  presents  an  analysis  about  the  use  of  the  direct  power  control  in grid-tied photovoltaic systems. This technique is used to directly regulate the  injection  of  instantaneous  active  and  reactive  power  to  the  three-phase  distribution  network,  avoiding  current  control  loops  used  by  traditional  control  strategies.  The  direct  power  control  performance  in  photovoltaic  systems  is  evaluated  by  PSIM  simulation,  which  shows  its  good  operation  for this kind of applications. Finally, a comparative analysis is made between this controller and a traditional technique used in photovoltaic systems called voltage oriented control.
Design and implementation of an Inverse Neural Network Controller applied To VSC Converter for active and reactive Power Flow, based on regions of work
Authors: Guarnizo Marin José Guillermo , Díaz Aldana Nelson , Trujillo Rodríguez César
Published: September 2023

Voltage Source Converter (VSC) usually used in High Voltage Direct Current (HVDC) systems, where a VSC can be used as inverter or rectifier. VSC systems allow the independent control of active or reactive power flow using different techniques. VSC systems present nonlinear behaviors, multiple inputs and multiple outputs, therefore nonlinear controllers can be used to obtain an adequate behavior. Inverse Neural Control is an alternative of an intelligent control since a mathematical model of the system is not required for designing controllers. Additionally, Inverse Neural Control can easily manage uncertainties and nonlinear behaviors typically presented in VSC systems. In this paper are presented the design, simulation and implementation of an Inverse Neural Control applied to the control of active and reactive power flow in a VSC system. Initially, is presented the simulation of the controller, where is evaluated the behavior of the system using a MIMO controller for the control of two parameters in the same time. Subsequently, the implementation of the controller is done and the e obtained is presented. Finally, a modular Inverse Neural Network Control is proposed to overcome the drawbacks presented in the behavior of the system when it was controlled in real implementation.
Evaluation of the air quality by using a mobile laboratory: Puente Aranda (Bogotá D.C., Colombia)
Authors: Palacio Soto Daniel Fabián , Zafra Mejía Carlos Alfonso , Rodríguez Miranda Juan Pablo
Published: September 2023

La localidad de Puente Aranda en la ciudad de Bogotá ha sido reportada como una  zona  de  alta  contaminación  atmosférica,  principalmente  debido  a  que  las  concentraciones  de  PM10  exceden  los  límites  legislativos.  Este  artículo  presenta una evaluación temporal y espacial de la calidad del aire en la zona industrial de la localidad de Puente Aranda mediante un laboratorio móvil de monitoreo. Los contaminantes atmosféricos medidos por el laboratorio durante el periodo de muestreo (2009/04/13-2009/12/21) fueron los siguientes: PM10, NOx, NO2, NO, SO2, CO y O3. Con respecto a la legislación colombiana, los resultados muestran que PM10 (24 horas) es el contaminante atmosférico que presenta el mayor número de excedencias durante el período de investigación (47,3%),  no  obstante,  la  evaluación  de  los  estados  excepcionales  por  contaminación del aire muestra que las máximas concentraciones registradas no  generan  un  nivel  de  prevención;  lo  anterior,  en  contraposición  con  los  resultados  obtenidos  mediante  la  utilización  del  índice  de  calidad  del  aire  propuesto por la Agencia de Protección Ambiental de EE.UU. Por otro lado, los resultados sugieren una tendencia similar en el comportamiento temporal de  PM10,  O3  y  NOx  sobre  la  totalidad  del  área  de  investigación;  es  decir,  probablemente por la existencia de fuentes dominantes en la zona industrial de  la  localidad.  Finalmente,  las  concentraciones  registradas  (PM10,  NO2, NOx, NO y CO) por el laboratorio móvil (zona central) son en promedio 2,30 y 2,01 veces superiores a las registradas por las estaciones móvil SDA (zona oriental) y fija SDA (zona occidental), respectivamente.
Methods for permeability measurements of fibrous reinforced preforms
Authors: Vargas Carlos , Patiño Iván , Vanegas Juan
Published: September 2023

Permeability is a property used to measure how a liquid flows through porous media. This property defines how a mold is filled in Liquid Composite Molding (LCM). It is important to know the different methods used to measure permeability (scopes, advantages and disadvantages) since in some cases it is possible to obtain significant errors during the measurements. Therefore it is important to compare theoretical methods by experimental measurements. In this work, a review about different techniques used in the literature to determine the permeability of reinforcement materials was done. The review was done in order to provide a reference for future study and research in the field of processing and simulation of liquid composites molding reinforced with preforms.
Design methodology applied to Photovoltaic System with Inductor Tapped Topology
Authors: Yris-Pastor Juan Carlos , Calleja-Gjumlich Jorge Hugo , Hernández-González Leobardo , Olmos-López José Armando
Published: September 2023

In order to transform DC in AC ready to be delivered to the electrical-grid, the concept of AC Module is typically applied; however, the use of this scheme, presented are some quality problems in the generation of energy, as, voltage gain low, high THD and low conversion efficiency. As a solution, a tapped-inductor topology is proposed to design an inverter into a Module Integrated Converter (MIC). The proposed converter and its control system are evaluated by simulations. The simulation results were verified using an 80 watts prototype, which is the maximum power rating for a single photovoltaic module, in the obtained experimental results can be appreciated that the prototype working in a real photovoltaic system: increases the voltage gain, increases the efficiency and reduces the harmonic distortion with respect to a traditional converter.
Interpreting the mexican standards for software process implementation and capacity assessment under a knowledge management approach
Authors: Flores Rios Brenda L. , Astorga Vargas María Angélica , Rodríguez Elias Oscar Mario , Ibarra Esquer Jorge Eduardo , Andrade María del Carmen
Published: September 2023

This   paper   presents   the   involvement   of   Knowledge   Management   in   Process   Improvement   when   applying   Mexican   Standards   for   software   process  implementation  (NMX-I-059-NYCE-2011)  and  process  capability  assessment  (NMX-I-15504-NYCE-2010).  We  discuss  and  characterize  the  types  of  knowledge  found  in  a  software  development  company.  From  this  characterization, we distinguish the first two levels of knowledge involved in a software process improvement project based on knowledge.
Calculation model for greenhouse gases diffuse emissions from transport. Analysis by urban design variables
Authors: Zubelzu-Mínguez Sergio , López-Díaz Alfonso Isidro , Gutiérrez-García Miguel Ángel , Blanco-Silva Fernando
Published: September 2023

Control  of  diffuse  emissions  can  be  included  among  the  most  relevant   actions aimed at breaking global warming. Emissions from road traffic join  outstandingly in diffuse emissions. This paper studies these kind of emissions  related  to  urban  planning  and  proposes  a  model  to  calculate  emissions,  by   using variables such as land use, vial length or edificability. Paper proposes  nonlinear equations through emission levels for each land use can be estimated.  Results show coefficient of determination of 0.644 for residential use, 0.591  for industrial, 0.592 for commercial and 0.591 for equipments. Figures that  probe a higher explanatory power for model linked to residential uses.
Ground surface settlement of loose sands densified with explosives
Authors: Vega-Posada Carlos A. , Zapata-Medina David G , García Aristizabal Edwin F.
Published: September 2023

This paper presents the results of a blast densification program conducted at a sanitary landfill located in South Carolina, U.S., to densify a liquefiable loose sand layer deposit and thus increase its resistance to liquefaction and flow during a seismic event. Five zones were selected for improvement, and a total of four blasting passes were implemented at each zone. Additionally, preblast CPT soundings were performed to determine the location of the loose sand layer, and thus define the distribution of the explosives. Topographic surveys were conducted along the centerline of the long direction to measure the ground surface settlements before and after each blast event. Measurements of ground surface settlements indicated that, regardless of the initial "apparent" decrease in penetration resistance commonly measured by standard verification tests, blast densification is an effective technique to increase the soil density. At the tested zones, the final relative densities varied from 65% to 91%. At these densities, the improved sand layer is not considered susceptible to liquefaction and flow, and a dilative response will be expected during a seismic event.
Band-Pass filters using OSRR cells
Authors: Díaz-Pardo Iván , Suárez-Fajardo Carlos Arturo , Puerto-Leguizamón Gustavo , Zona-Ortiz Tatiana
Published: September 2023

This paper presents the design process (including optimization and characterization) of a band-pass filter through the use of OSRR-structured meta-material cells over micro-strip substrates. The proposed design, which stems from the OSRR cell model, includes a partial ground plane etched at the bottom plane instead of, and square windows etched at the bottom plane and achieve optimization through a parametric analysis carried out over the transmission-line segments that connect the cells to the main transmission line as well as over inter-cell lines. The results yielded a resonance central frequency and a corresponding bandwidth of 2.7 GHz and 700MHz, respectively. By controlling the length of the connecting lines from the cells to the main transmission line, it is possible to tune the central frequency to a lower frequency than that of an OSRR cell. With respect to the ground plane windows version, the partial ground plane version has the capacity to add transmission zero (4.6GHz) above a/the transmission pole, which improves the rejection depth (8dB) without increasing the filter size.
Sonochemical effects on ZnO particles
Authors: Costa Bruna C. , B. Arruda Larisa , Lisboa-Filho Paulo N.
Published: September 2023

A variety of technological applications related to oxide semiconductor-based devices have attracted great interest among the scientific community, leading to an increase in studies of these materials during the last years. Among such materials,  zinc  oxide  (ZnO)  has  applications  in  several  areas,  from  light-emitting  diodes  (LEDs)  to  photovoltaic  devices  in  solar  cells.  Considering  the  physical  and  chemical  properties  conferred  to  these  materials,  the  possibilities  of  application  in  technological  devices  depend  greatly  on  the  synthesis routes employed.  Accordingly, we investigated the morphological modifications in ZnO particles when subjected to sonochemical treatment and the influence of related synthesis method parameters, such as the time and amplitude of sonication. To analyze such effects, four samples were prepared with  different  sonochemical  treatment  conditions:  in  two,  the  amplitude  of  sonication  was  kept  constant  while  varying  the  time  of  sonication,  and  in  the other two, the time was kept constant while varying the amplitude. The analysis of the results obtained indicated that sonochemical treatment led to superficial morphological modifications in ZnO particles. Furthermore, these modifications became more apparent when higher amplitude and longer time of sonication were employed in sample synthesis.
Fuzzy control techniques applied to a three phase synchronous rectifier current loop
Authors: Berzoy-Llerena Alberto , Guzman-Arguiz Victor Manuel , Giménez de Guzmán María Isabel , Restrepo-Zambrano José Alex , Aller-Castro José Manuel
Published: September 2023

This work presents three fuzzy variable structure control (FVSC) techniques applied to the current control loop in a three-phase synchronous rectifier. These techniques are based in a Takagi-Sugeno (T-S) fuzzy PI controller. The first controller is a first-order FVSC, used as a reference. Then, two FVSC strategies are presented and tested, a second and a third-order FVSC. These control schemes are first simulated and then tested in a general-purpose laboratory synchronous rectifier test bench. Experimental results show that control performance is good in all three schemes, achieving current harmonic compensation and power factor correction.
Efficient hardware implementation of a full COFDM processor with robust channel equalization and reduced power consumption
Authors: López Parrado Alexander , Velasco Medina Jaime , Ramírez Gutiérrez Julián Adolfo
Published: September 2023

This work presents the design of a 12 Mb/s Coded Orthogonal Frequency Division Multiplexing (COFDM) baseband processor for the standard IEEE 802.11a. The COFDM baseband processor was designed by using ourdesigned circuits for carrier phase correction, symbol timing synchronization, robust channel equalization and Viterbi decoding. These circuits are flexible, parameterized and described by using generic structural VHDL. The COFDM processor has two clock domains for reducing power consumption, it was synthesized on a Stratix II FPGA, and it was experimentally tested by using 2.4 GHz Radio Frequency (RF) circuitry.
Managing and developing distributed research projects in software engineering by means of action-research
Authors: Pino Francisco J. , Piattini Mario , Horta Travassos Guilherme
Published: September 2023

Participation in software research projects involving several organizations (research groups, enterprises, etc) scattered all around the world is an increasingly frequent phenomenon. The geographical distribution of the organizations entails the research projects development and management taking suitable Software Engineering research methods which must satisfy the acquired commitments as well as the new coming challenges. In thatrespect, this paper discusses how the Action-research qualitative method can be suitable for managing and developing software engineering distributed research projects. Furthermore, we propose a strategy to guide the use of Action-research in the context of distributed research projects. The application of this strategy in a research project, in which more than 10 enterprises and 27 research groups from 13 countries from Latin-America plus Portugal and Spain took part, is also illustrated. We observed that the use of the proposed strategy was able to provide the research managers with: (i) a suitable research project centralized administration, and (ii) appropriate coordination and apportioning of the research responsibilities for the research products construction and validation. It is important to highlight that the proposed strategy is a new way of applying the Action-research method in Software Engineering.
Home health care logistics management problems: a critical review of models and methods
Authors: Gutiérrez Elena Valentina , Vidal Carlos Julio
Published: September 2023

Home Health Care (HHC) services are based on a delivery network in which patients are hospitalized at their homes and health care providers must deliver coordinated medical care to patients. Demand for HHC services is rapidly growing and governments and health care providers face the challenge to make a set of complex decisions in a medical service business that has an important component of logistics problems. The objective of this paper is to provide a critical review of models and methods used to support logistics decisions in HHC. For this purpose, a reference framework is proposed first in order to identify research perspectives in the field. Based on this framework, a literature review is presented and research gaps are identified. In particular, the literature review reveals that more emphasizes is needed to develop and implement more integrated methodologies to support decisions at tactical and strategic planning levels and to consider key features from real systems.
Structural model to evaluate the competence of the software developer
Authors: Cantú-Mata José Luis , Hernández José Segoviano , Penilla-Leal Roberto , Zurita-Alarcón Raúl de Jesús
Published: September 2023

Every timemore and more companies are turning to hiring service providers for  “not  central”  activities  in  the  organization.  The  purpose  of  the  study  is  to  develop  and  validate  a  structural  model  to  assess  the  skills  of  software  developer.  The  evaluation  was  performed  by  the  service  quality  provided  from the client’s perspective, the results are 32 companies hiring the software Outsourcing  service.  SMART-PLS  software  was  used  to  perform  statistical  analysis  to  obtain  an  R2  of  0.836  and  0.641  for  the  variables:  Preparation  employee-company (Y1) and updated competent staff (Y2), respectively.
Variable frequency harmonic vibration suppression using active vibration absorption
Authors: Beltrán-Carbajal Francisco
Published: September 2023

Passive   dynamic   vibration   absorbers   have   been   extensively   used   for   harmful  vibration  attenuation  in  many  practical  engineering  systems.  The  applicability  of  these  passive  vibration  absorption  devices  is  limited  to  a  specific  narrow  operation  frequency  bandwidth.  In  this  article,  a  novel active  vibration  absorption  scheme  is  proposed  to  extend  the  vibration  suppression  capability  of  a  passive  mass-spring-damper  absorber  for  any  excitation  frequency,  including  interest  resonant  harmonic  perturbation forces.  The  central  foundations  of  a  passive  absorber  are  exploited  in  the  design stage of the presented absorption scheme. Thus, the active absorption device applies forces on the protected mechanical system that counteract the unknown perturbation forces, conserving the vibration attenuation property of the passive absorber. The perturbation force is estimated on-line using an extended state observer proposed in this work. Simulation results are included to show the efficiency of the active vibration absorption scheme to reject completely  unknown  resonant  and  chaotic  forced  vibrations  affecting  the primary mechanical system, and to prove the effectiveness of the estimation of exogenous perturbation forces.
Ontological approach to detect holonic concepts in organizations
Authors: Giraldo G. Gloria Lucía , Arboleda Adrian S. , Zapata Germán
Published: September 2023

Today, organizations have difficulties to understanding the holonic paradigm and further, to identify in their production processes possible holons existence. There are artifacts such as ontologies and pre-conceptual schemas which represent knowledge to understand the elements of a domain. Current literature suggests some ontologies to represent holonic concepts, but these ontologies lack of integration with the processes of an organization. These organizational processes are found mainly, in natural language which by its nature is ambiguous and present linguistic irregularities. Knowing whether a company has holons or it handles holonic properties requires a complex investigation by analysts. This paper proposes an ontology that helps to understand what is a holonic system and see if a process in an organization, modeled by pre-conceptual schemas, handling holonic characteristics. This paper provides an insight into the possible implementation of holonic systems in an organization.
Computational Intelligence Techniques Applied to Coagulant Estimation Models in Water Purification Process
Authors: Villarreal Campos Carlos Alberto , Caicedo Bravo Eduardo
Published: September 2023

Four coagulant estimation models in water purification process are presented. For its developing computational intelligence techniques are used, which include neural networks, fuzzy logic (Sugeno and Mamdani type) and ANFIS structures. The methodology described is based on the operator's experience extraction from operational historical data (in neural network, fuzzy logic Sugeno type and ANFIS case), and the linguistic information given by an experimented plant operator (in fuzzy logic Mamdani type case). According to the reached results, by applying some of this models in a control system strategy, could be possible overcome some of the current limitations found in the most widely used techniques for coagulant dosing in water purification plants; jar tests and streaming current detector.
Calibration methodology for air pollutants dispersion models. Case Study: PM10 dispersion in the surroundings of Havana
Authors: González Cruz Milvia B. , Pire Rivas Saturnino F. , Cuesta Zedeño Luis F. , López Jiménez P. Amparo
Published: September 2023

This paper describes a general methodology for calibration of air pollutants dispersion models. Numerical simulation of this phenomenon is a complex process due to it depends on many factors. Main contribution of this paper is to consider in a unique calibration methodology of uncertainty and sensitivity analysis. Furthermore, the methodology is applied successfully in the calibration process gaussian dispersion model ISCST3 applied in a densely populated area, the Higher Polytechnic Institute José Antonio Echeverría (CUJAE) in Havana.
Detection and classification of Non-Proliferative Diabetic Retinopathy using a Back-Propagation neural network
Authors: Rosales-Silva Alberto Jorge , Velázquez-González Jesús Salvador , Gallegos-Funes Francisco Javier , Guzmán-Bárcenas Guadalupe de Jesús
Published: September 2023

One of the most serious complications of type 2 Diabetes Mellitus (DM) is the Diabetic Retinopathy (DR). DR is a silent disease and is only recognized when the changes on the retina have progressed to a level at which treatment turns complicate, so an early diagnosis and referral to an ophthalmologist or optometrist for the management of this disease can prevent 98% of severe visual loss. The aim of this work is to automatically identify Non Diabetic Retinopathy (NDR), and Background Retinopathy using fundus images. Our results show a classification accuracy of 92%, with sensitivity and specifity of 95%.
Dynamics Study of Processes Fracture and Fiber-Reinforced Materials Delamination
Authors: Tamayo-Meza Pedro , Ovchinsky Anatoly S. , Sandoval-Pineda Juan Manuel , Flores-Herrera Luis Armando , González Huerta Rosa de G.
Published: September 2023

With the construction of a plane model, a qualitative study was made in order to observe the transactions that are developed during the fracture process and its  simulation  on  different  sections  of  a  composite,  from  the  accumulation  of  the  damage  stage  to  the  moment  when  the  crack  propagates  abruptly  causing a macro fracture. An algorithm was developed to observe the stress redistribution processes and the compound is simulated including packaging defects  of  the  filaments.  During  the  study  of  the  fracture  processes  in reinforced composites there are many factors to consider that are interrelated and that have a casual character. The mechanical properties of the fibers and the matrix, the matrix-fiber adherence and the resistance of the interface, all vary with the application of the load. The use of computational methods opens great possibilities for the development of the simulation and the models of the fracture processes.
Design and simulation of an attitude determination system based on the Extended Kalman Filter for Cube-Sat Colombia I
Authors: Castellanos Cesar A. , Aparicio Pico Lilia Edith
Published: September 2023

The purpose of this document is to describe the design and simulation of an attitude determination system (ADS) for the CubeSat Colombia I picosatellite, based on an extended Kalman filter EKF [1,2]. In this development the propagation of the State of the system has been implemented through a Runge-Kutta procedure instead of traditional State Transition matrix method, improving predictions from the EKF filter without making direct measurements of angular velocity, it was obtained a reduced prediction time by incorporating a deterministic algorithm (the TRIAD algorithm) within the EKF. The results validated through simulation are those shown in this article.
A fault location method applied in power distribution systems based on k-NN classifiers parameterized using genetic algorithms and the reactance estimation
Authors: Zapata-Tapasco Andrés , Pérez-Londoño Sandra , Mora-Flórez Juan
Published: September 2023

In  this  paper,  a  parameterization  strategy  of  a  k  nearest  neighbors  (k-NN) based  fault  locator  is  described.  This  technique  is  complemented  by  a  well  validated location method based on the estimation of the fault impedance. This hybrid strategy is validated in a real power distribution feeder, having obtained acceptable results. Finally and as an important advantage of the here proponed  methodology,  it  is  remarkable  the  easy  implementation  process,  considering real distribution feeders (more than 100 nodes).
Electrical energy conversion system design with single-phase inverter and H5 transformerless topology
Authors: González-Morales Luis Gerardo , Colina-Morles Eliezer , Vanegas-Peralta Pablo , Sempertegui-Álvarez Rodrigo Efraín
Published: September 2023

This  paper  presents  the  design  of  an  electrical  energy  conversion  system  (EECS)  for  the  use  of  solar  energy  and  its  conditioning  for  injection  of  energy to the commercial power grid. A single-phase full-bridge inverter with transformerless H5 topology coupled to an LCL filter is used. The system is identified using an averaged small-signal state space model; while the used cascade control scheme is tuned by pole placement and includes a maximum power disturb-observe tracking type algorithm of that increases efficiency by  operating  the  system  at  the  optimum  operating  point  of  the  solar  panel.  This  design  describes  essential  technical  aspects  in  the  components  sizing  and selection for experimental development, as well as the control structure design for a good performance to face systems perturbations.
Low complexity demodulator for BFSK waveforms based on polygonal approximation
Authors: Torres-Gómez Jorge , Hernández-Montero Fidel Ernesto , Habermann Joachim
Published: September 2023

The  present  article  relates  in  general  to  digital  demodulation  of  Binary  Frequency  Shift  Keying  (BFSK  waveform).  The  objective  of  the  present  research is to obtain a new processing method for demodulating BFSK-signals in order to reduce hardware complexity in comparison with other reported. The solution proposed here makes use of the theories of matched filters and curve segmentation. The article describes the integration and configuration of a Sampler Correlator and polygonal segmentation blocks in order to obtain a digital receiver for properly demodulating the signal received. The proposed solution  is  shown  to  reduce  dramatically  the  complexity  in  hardware  and  has a better performance regarding noise in comparison with other reported. Theoretical  details  concerning  limits  of  applicability  are  also  given  by  closed-form  expressions.  Simulation  experiments  are  illustrated  to  validate  the overall performance.