bluuebunny/crossref_metadata_2025 huggingface dataset:
Hearing protection and communication in high noise environments using vibration sensing and neural network voice transformation
Authors: Beltman Willem , Cordourier Hector , Lopez Meyer Paulo , Huang J. , Lu H. , Nachman L.
Published: September 2021

In the United States alone, there are more than 9 million workers who are exposed to high levels of noise (> 85 dBA) that require hearing protection. Not only is there a risk of hearing damage due to these high noise levels, but it also prevents communication between people, leading
to significant safety risks, including people not using hearing protection because of the desire to communicate. Workers in such high noise environments typically also wear safety glasses. This paper outlines an integrated system with safety glasses, hearing protection, and communication elements,
using vibration sensing technology and a neural network based voice transformation routine. Data was collected to train the neural network based voice transformation. Recordings were made under various representative noise conditions, with some well exceeding sound pressure levels of 93 dBA,
and Signal to Noise Ratios were extracted. In addition, experiments were conducted according to a modified ITU P.835 approach to determine intelligibility, naturalness and overall quality. The results demonstrate that with this approach, speech can be clearly understood in such high noise
environments with this approach.
Post-occupancy HVAC survey: What can be learned form 1,800 measurements
Authors: Fullerton Jeff , Maurer Alexander
Published: September 2021

After opening a new multi-family residential complex, the association was asked to perform a comprehensive survey of the sound from their HVAC systems. The survey sought to quantify the sound levels from every HVAC diffuser, grille, and register that served the residences and common
spaces. The effort required access into over 250 residences typically measuring between 3 and 5 locations in each residence, and as many as 7 to 9 locations in penthouse residences. While the heat pump systems serving the residences were similar models, their capacities varied depending on
the square footage and solar exposure of the residence. The variations in the sound levels of these systems and from the central ventilation were significant. This presentation will highlight what was learned from the survey.
A study on the effects of compression of the felt on flow resistance and acoustic characteristics
Authors: Yang Yoon-sang , Lee Seung
Published: September 2021

The sound absorbing materials used to reduce automobile interior noise are classified into Felt and PU Foam. Felt are widely used not only in internal combustion engine vehicles but also in Electric Vehicles because they are eco-friendly materials that can be recycled and relatively
light. Automotive interior parts manufacture materials in various thicknesses depending on the shape of matched parts. The pressed material changes the density, flow resistance and affects the overall NVH performance of the vehicle. In this study we worked to confirm changes in flow resistance,
sound absorption coefficient and sound transmission loss performance among acoustic characteristics based on the compress ratio of Felt. It was confirmed that the larger the compression of Felt, the larger the flow resistance value, thereby affecting the acoustic characteristic impedance,
sound absorption coefficient and sound transmission loss.
Methods for the assessment of low-frequency noise from mining activities in the Netherlands
Authors: Assink Jelle , Nusselder Rosan , White Kim , den Ouden Olivier , de Graaff Erik , Nieuwenhuizen Edwin
Published: September 2021

According to the World Health Organisation, noise ranks among the environmental stressors with the highest impact on public health. The contribution of low-frequency noise (LFN) is not well-understood and deserves more research attention from several perspectives, that include epidemiology,
acoustics as well as civil engineering. The attribution of symptoms to LFN is increasing due to a growth in public awareness and the expansion of industrial installations and traffic. In the Netherlands, numbers of LFN-related complaints are rising. Several of those have been attributed to
the mining industry. However, an effective methodology for the assessment of such complaints is not yet available. In this presentation, methods are defined to assess LFN from mining activities in the Netherlands, focusing on the extraction, processing, transportation and storage of gas, salt
and geothermal heat. Through a literature review and interviews with domain experts, methodologies have been derived with regards to 1) the prediction of LFN generation at the source, 2) observational techniques and 3) potential impacts on health. A broad low-frequency band is considered,
spanning from the often-discarded infrasonic frequencies to up to 200 Hz. Based on this study's results, recommendations are given for establishing a standard procedure to assess LFN produced by mining activities.
Health effects related to wind turbine sound: A review
Authors: van Kamp Irene , van den Berg Frits
Published: September 2021

Worldwide questions about health effects play a role in local debates about windfarms. A review was prepared for the Swiss Federal Office for the Environment of the literature published since 2017 about the health-effects of wind turbine sound. Scientific literature was collected on
the effect on annoyance, sleep disturbance, cardiovascular disease and metabolism. Also, visual annoyance and other non-acoustic factors, such as appraisal of the local decision making process were investigated. Annoyance came forward as a consequence of wind turbine sound: the louder the
receiver sound level, the stronger the annoyance response. For other health effects, results of scientific research are inconsistent. Effect are not a consequence of the sound levels, but rather related to the residents' annoyance. The literature did not show that infrasound or low frequency
sound leads to other effects when compared to sound at higher frequencies. Evidence shows that residents experience less annoyance when they participate in the siting process. By being able to take part in the siting and in balancing costs and benefits, residents experience less annoyance.
It is therefore important to take worries of local residents seriously and involve them in the process of planning and the siting of wind turbines.
Effects of moisturized inflow on compressor performance and aerodynamic noise
Authors: Sun Changhong , Cao Yipeng , Liu Chen
Published: September 2021

The effects of moisturized inflow on turbocharger compressor performance and aerodynamic noise were numerical analyzed in this paper. The gas-liquid two-phase flow method based on Euler-Lagrange model was firstly introduced. The influence of water concentration and water droplet diameter
on compressor performance and internal flow characteristics at design speed were studied using the two-phase flow method. The compressor aerodynamic noise was also predicted at design condition under two different inflow conditions, including ideal inflow and moisturized inflow with 0.1% water
concentration. The results indicate that moisturized inflow with an appropriate water concentration can reduce the outlet temperature of the compressor and improve the compressor performance, in which the water concentration is a dominant parameter. There is a phase transition process of water
in the compressor with moisturized inflow, but moisturized inflow has little effects on the compressor internal flow characteristics. Moreover, the moisturized inflow also has influence on compressor aerodynamic noise.
Proposal of Acoustic Liners Combined with Fine-Perforated-Film
Authors: Murata Yo , Ishii Tatsuya , Enomoto Shunji , Oinuma Hideshi , Nagai Kenichiro , Oki Junichi , Daiguji Hirofumi
Published: September 2021

This paper deals with a resonant type liner panel with a special surface structure. A typical resonant type liner panel generally consists of a perforated face plate, cells, and a back rigid plate. One of the technical challenges of the acoustic liners applied to the future ultra-high
bypass ratio engines is to increase the sound absorption efficiency under grazing conditions because the nacelle, covering of the engine, tends to reduce its length and the lined area. It is known that the sound absorption of the conventional liners tends to deteriorate as grazing flow increases.
The authors introduced a special thin acoustically transparent film over the face plate of the acoustic liner. The film, a fine perforated film (FPF), is expected to prevent the interaction of the grazing flow with the opening of the liner face plate. An experimental result with a flow duct
rig in JAXA confirmed that the proposed combination of the acoustic liner and the FPF improved the absorption in acoustic energy under grazing conditions, compared with the sole acoustic liner and simple treatment of the FPF.
Non-invasive Fetal heartbeat detection using vibration sensing system
Authors: Kim Wanseung , Jeon Jonghoon , Hoh Jeongkyu , Park Junhong
Published: September 2021

Monitoring the fetal heartbeat is essential for obtaining information about fetal condition during pregnancy. By measuring the maternal uterine contractions, the movement of the fetus, and the fetal heart rate, the state of the fetus is detected and taking appropriate measures prevent
fetal health abnormality. The NST method is used to obtain the fetal heart rate. The ECG method is useful to observe heart rhythm. In this study, a system that can detect fetal heartbeat signals using vibration sensors is proposed. For vibration measurement, a band-type device with a sensor
was proposed. The band was wrapped around the mother's stomach to sensing signals generated by the mother's body. In order to extract the fetal heartbeat signal, appropriate signal processing for denoising is performed. Processed signal was divided into several IMFs using the CEEMD method.
The maternal heartbeat signal and fetal heartbeat signal were separated from the IMF. Through frequency analysis, the characteristics of each signal make clear
Intraocular Pressure Estimation Method Based on Vibration Propagation Characteristics According to Structure Contact
Authors: Deukha Kim , Jeon Seongwook , Lee Won June , Park Junhong
Published: September 2021

Intraocular pressure (IOP) measurement is one of the basic tests performed in ophthalmology and is known to be an important risk factor for the development and progression of glaucoma. Measurement of IOP is important for assessing response to treatment and monitoring the progression
of the disease in glaucoma. In this study, we investigate a method for measuring IOP using the characteristics of vibration propagation generated when the structure is in contact with the eyeball. The response was measured using an accelerometer and a force sensitive resistor to determine
the correlation between the IOP. Experiment was performed using ex-vivo porcine eyes. To control the IOP, a needle of the infusion line connected with the water bottle was inserted into the porcine eyes through the limbus. A cross correlation analysis between the accelerometer and the force
sensitive resistor was performed to derive a vibration factor that indicate the change in IOP. In order to analyze the degree of influence of biological tissues such as the eyelid, silicon was placed between the structure and the eyeball. The Long Short-Term Memory (LSTM) deep learning algorithm
was used to predict IOP based on the vibration factor.
Finite element sound field analysis on measurement of absorption coefficient in a reverberation room -Relationships between inclination of walls and measurement results-
Authors: Tomiku Reiji , Okamoto Noriko , Otsuru Toru , Iwamoto Shun , Suzuki Shoma
Published: September 2021

The absorption coefficients in a reverberation room are most representative measure for evaluating absorption performance of architectural materials. However, it is well known that measurement results of the coefficient vary according to a room shape of the measurement and area of the
specimen. Numerical analyses based on wave acoustics are effective tools to investigate these factors on absorption coefficient measurement in reverberation room. In this study, sound fields for the measurement of absorption coefficient in reverberation room are analyzed by time domain finite
element method (TDFEM). This study shows effectiveness of the analysis for investigation on causes of variation in the measurement results and improvement methods of the measurement. First, some measurement sound fields for absorption coefficient in reverberation rooms the walls of which are
incline or decline are analyzed by the TDFEM. Next, reverberation times in each sound fields are calculated from the results obtained by TDFEM and the absorption coefficients are evaluated from the reverberation time of the room with and without specimen. Finally, the relationships among room
shape, degree of inclination of the wall, the sound absorption coefficient of the specimen, frequencies and the measurement absorption coefficient are investigated.
Aeroacoustic analysis of slat tones
Authors: Kamliya Jawahar Hasan , Alihan Showkat Ali Syamir , Azarpeyvand Mahdi
Published: September 2021

Experimental measurements were carried out to assess the aeroacoustic characteristics of a 30P30N high-lift device, with particular attention to slat tonal noise. Three different types of slat modifications, namely slat cove filler, serrated slat cusp, and slat finlets have been experimentally
examined. The results are presented for an angle of attack of α = 18 at a free-stream velocity of U = 30 m/s, which corresponds to a chord-based Reynolds number of Re = 7 x 10. The unsteady surface pressure near the slat region and far-field noise were made simultaneously to gain a deeper
understanding of the slat noise generation mechanisms. The nature of the low-frequency broadband hump and the slat tones were investigated using higher-order statistical approaches for the baseline 30P30N and modified slat configurations. Continuous wavelet transform of the unsteady surface
pressure fluctuations along with secondary wavelet transform of the broadband hump and tones were carried out to analyze the intermittent events induced by the tone generating resonant mechanisms. Stochastic analysis of the wavelet coefficient modulus of the surface pressure fluctuations was
also carried out to demonstrate the inherent differences of different tonal frequencies. An understanding into the nature of the noise generated from the slat will help design the new generation of quite high-lift devices.
Noise measurements in the AS 350 helicopter under the specific operating conditions of SAR mission
Authors: Gelain Felipe , Paul Stephan
Published: September 2021

The AS 350 helicopter is a small and versatile helicopter used in many countries by private and public operators. In some countries the model is also often used for SAR missions. In the Brazilian public rescue services, AS 350 helicopters account for around 80 percent of the whole fleet.
SAR missions often require operating conditions different from those for usual passenger transport. This includes flying and hovering with open doors or at low altitudes and low speeds. Noise exposure during SAR missions is of concern not only for the crew but also for the passengers, i.e.
injured patients or newborn. While very important, data on acoustic conditions in SAR aircraft are scarce and do not exist for the AS 350 yet. Therefore, to investigate the noise in the AS 350 during SAR specific operating conditions different aircraft of the same model were equipped with
recording equipment (microphone and SQuadriga II stand-alone front end ) and flown in the specific operating conditions of SAR missions. Recordings were analyzed using not only 1/n-octave and or FFT analysis, but also variable frequency resolution Fourier analysis for better low frequency
analysis and psychoacoustic models available in ArtemiS Suite v12. Results show how noise characteristics vary depending on the operation of the aircraft, and which operating conditions are the most critical and should be avoided. The data can be used by SAR operators to build noise optimized
mission profiles for critical missions, such as transportation of newborn and maintaining operational safety.
Adjustable sound insulation frequency band through the combination of membrane-type acoustic metamaterial array
Authors: Wu Xiang , Jiang TengLong , Shao JianWang , Deng GuoMing , Jin Chang
Published: September 2021

Membrane-type acoustic metamaterials are thin films or plates composed of periodic units with small additional mass. A large number of studies have shown that these metamaterials exhibit tunable anti-resonance, and their transmission loss values are much higher than the corresponding
quality laws. At present, most researches on membrane-type acoustic metamaterials focus on the unit cell, and the sound insulation frequency band can only be adjusted by adjusting the structural parameters and material parameters. In this paper, two kinds of acoustic metamaterials with different
structures are designed, which are the center placement of the mass and the eccentric placement of the mass.The two structures have different sound insulation characteristics. By designing different array combinations of acoustic metamaterials, the sound insulation peaks of different frequency
bands are obtained. This paper studies the corresponding combination law, and effectively realizes the adjustable sound insulation frequency band.
“Futuro da nação ou pequenas sementes do mal”?
Authors: Freitas Pinto Silva Soares Lívia
Published: September 2021

Este artigo avalia a gestão infantojuvenil no Distrito Federal por duas instâncias – a Polícia, a quem cabia zelar pela ordem social, e os juízes da Câmara de Apelação, cuja atribuição consistia em analisar as solicitações de habeas corpus, impetradas pelos menores internos da Colônia Correcional dos Dois Rios (CCDR) – entre 1910 e 1920. Criada pelo governo republicano, em 1893, a instituição gerida pela polícia deveria corrigir pelo trabalho, adultos condenados e menores infratores na Ilha Grande (RJ). Em vista disso, a ênfase recai sobre o trabalho policial, dado que competia a seus agentes a missão de investigar a vida dos menores e suas famílias, além de produzir representações sobre eles. Assim, indaga-se sobre as diretrizes que guiaram os agentes responsáveis por deliberarem os destinos dos internos em Dois Rios. De igual maneira, investigamos os discursos construídos pelos menores e por suas famílias com o fim de convencer o chefe de polícia de que eram merecedores da liberdade. Por fim, buscamos delinear o perfil das famílias dos menores. Os referenciais teóricos estão centrados nos estudos de Foucault, Bretas, Godelier, entre outros. Acredita-se que ao revisitar a gestão infantojuvenil contribuiu-se para a escrita de uma história social da infância abandonada na Primeira República.
Neoliberalismo e luta social na América Latina no Tempo Presente
Authors: Pinheiro de Araujo Rafael
Published: September 2021

Em 10 de novembro de 2019, Evo Morales foi levado a renunciar ao seu mandato presidencial pelo então comandante das Forças Armadas, general Williams Kaliman. A instabilidade política após a eleição presidencial em 20 de outubro contribuiu para esse desfecho. Esses acontecimentos fomentaram inúmeros debates nos meios universitário e jornalístico sobre as razões que possibilitaram o governo do primeiro presidente indígena da história boliviana. Da mesma forma, análises foram feitas com o intuito de avaliar a sua gestão presidencial. Almejamos contribuir com tais debates neste artigo. Assim, refletiremos sobre as razões que levaram Evo Morales à presidência boliviana. Exploraremos os impactos do neoliberalismo na Bolívia e América Latina e faremos uma breve teorização sobre essa doutrina em sua primeira parte. Em um segundo momento, observaremos a história boliviana entre 2000 e 2005 e examinaremos as causas para a chegada de Morales à presidência.
cinema estadunidense pós-11 de Setembro: Hollywood na contramão a Doutrina Bush
Authors: Ivori de Matos Daniel
Published: September 2021

As imagens da manhã do dia 11 de setembro de 2001 marcaram um dos eventos mais significativos deste século: os atentados às Torres Gêmeas e ao Pentágono, símbolos do poder estadunidense. Completados vinte anos, seus efeitos foram – e ainda são – sentidos em todo o globo. Inicialmente, nota-se a exploração das imagens do acontecimento como um novo marco que abalou a nação; em seguida, o terrorismo assumiu a ordem do dia, muitos discursos políticos do então presidente George W. Bush sobre o novo inimigo, o terrorismo, foram apropriados por vários governantes, tornando-se uma estratégia internacional antiterrorista, que justificaram mudanças legislativas nos EUA, impulsionaram os conflitos no Afeganistão e no Iraque, incorporando, ainda, outras discussões, referentes ao Oriente Médio e ao islamismo. Subentende-se que esse capítulo da história dos EUA é impossível de ser escrito sem as imagens, já que a espetacularização das imagens dos atentados causou grande impacto na sociedade estadunidense. Assim, buscou-se neste artigo compreender através do cinema, algumas das produções que se posicionaram contra a Doutrina Bush ainda no primeiro mandato de George Walker Bush.
Research on a Visual Servo Method of a Manipulator Based on Velocity Feedforward
Authors: Wang Rui , Liang Changchun , Pan Dong , Zhang Xiaodong , Xin Pengfei , Du Xiaodong
Published: September 2021

In this paper, a method of predicting the motion state of a moving target in the base coordinate system by hand-eye vision and the position and attitude of the end is proposed. The predicted value is used as the velocity feedforward, and the position-based visual servo method is used to plan the velocity of the end of the manipulator. It overcomes the influence of end coordinate system motion on target prediction in a discrete system and introduces an integral control method to compensate for the prediction velocity, eliminating the end tracking error caused by target velocity prediction error. The effectiveness of this method is verified by simulation and experiment.
PERAN KOMUNIKASI E-WORD OF MOUTH TERHADAP VISIT INTENTION OBJEK WISATA
Authors: Mokhamad Favian Rizki Pratama  , Erna Andajani  , Siti Rahayu
Published: September 2021

Penelitian ini bertujuan mengetahui peran e-WOM (Instagram) terhadap Visit Intention obyek wisata di Surabaya yang dipengaruhi oleh attitude toward behavior dan destionation image. Metode penelitian menggunakan SEM (Structural Equation Modeling) dengan jumlah sampel sebanyak 150 responden yang aktif menggunakan Instagram. Penelitian ini menunjukkan e-WOM melalui Instagram berperan penting terhadap visit intention objek wisata karena menimbulkan persepsi yang sangat baik bagi wisatawan lainnya dan membentuk image Surabaya adalah destinasi wisata yang menyenangkan. Kondisi ini menimbulkan persepsi positif bagi wisatawan lainnya mengenai Surabaya.

 

Abstract

This study aims to determine the role of e-WOM (Instagram) on the visit intention of tourism objects in Surabaya which is influenced by attitude toward behavior & destination image. The research method uses SEM (Structural Equation Modeling) with a sample of 150 respondents who actively use Instagram. This study shows that e-WOM through Instagram plays an important role in the visit intention of tourist objects because it creates a very good perception for other tourists and forms the image of Surabaya as a pleasant tourist destination. This condition creates a positive perception for other tourists about Surabaya.
Aproximación deconstructiva a la noción de Calidad de la Educación en el contexto latinoamericano
Authors: Vidal Araya Leonardo
Published: September 2021

El autor presenta un ensayo respecto del concepto de calidad de la educación. Realiza una aproximación deconstructiva a partir de la raíz misma de la noción de calidad y su relación con la educación. En este trabajo se pone en evidencia algunos problemas y paradojas relacionados con la estrecha ligazón entre calidad y evaluación, la ubicuidad y ambigüedad del concepto y la posibilidad real de evaluar la calidad de la educación. En el contexto Latinoamericano se analiza la introducción de la noción de calidad de la educación a partir del Proyecto Principal de Educación de América Latina y el Caribe, coordinado por la UNESCO, se toma como referencia algunos documentos relacionados con las Reuniones Regionales Intergubernamentales en torno al Proyecto Principal y otros documentos de Conferencias Iberoamericanas de Educación en los que se aborda el tema de la calidad. Siguiendo con un trabajo de deconstrucción, a partir de esos textos, se presenta la preocupación por la calidad y equidad como una notable paradoja, la aparente neutralidad del concepto y la permanente indefinición de la noción de calidad de la educación.
El uso del Foro de Discusión Virtual en la enseñanza
Authors: Ornelas Gutiérrez David
Published: September 2021

En años recientes el empleo de las NTIC en el campo educativo ha aumentado considerablemente. Actualmente la comunidad académica cuenta con múltiples opciones para incorporar las herramientas tecnológicas en la enseñanza. En este trabajo, dirigido principalmente a los profesores, se presenta una breve propuesta didáctica para obtener ventajas en el uso de los foros de discusión virtuales. Se señalan algunos beneficios pedagógicos de los foros de discusión, se proponen alternativas para su utilización en la práctica docente y se sugieren algunos aspectos referidos a la planeación y evaluación de los foros.
¿Por qué lineamientos de política para la educación ambiental?
Authors: Barrantes Martínez Armando Martín
Published: September 2021

Vivimos en un lugar determinado, en él hemos nacido o a él hemos llegado. Pero ese lugar está compuesto por múltiples elementos que se entrelazan entre ellos y con nosotros mismos. Elementos vivos, como seres humanos, animales y plantas, y elementos no orgánicos como los formados naturalmente o producto del artificio del hombre y de la interacción con sus semejantes. Asimismo, el accionar del clima, los incidentes que surgen en el devenir de cada día, tanto naturales como generados por los seres vivos, todo ello conforma el ambiente.La ciencia occidental ha logrado que distingamos las partes mediante el análisis, pero el error consiste en creer que con conocer las partes nos es suficiente. Y hemos perdido de vista, por eso, la visión totalizante que ha sido la visión originaria de todos los pueblos y que aún conservan muchas de las naciones que habitan en nuestro territorio.
El film "Shrek": una posibilidad desde la educación artística para trabajar en la formación docente la lectura de la identidad y los valores
Authors: Ros Nora
Published: September 2021

Este artículo presenta una propuesta que toma al cine como un medio de comunicación, un contador de historias dominado por la distancia, un transmisor de valores, un portador de arte y de conocimientos y desde ese lugar analiza la película Shrek, poniendo la mirada en el tratamiento de significados relacionados con valores e identidades marcados desde los esquemas de los cuentos clásicos-tradicionales infantiles.

A partir de ese análisis propone un trabajo pedagógico para contribuir, desde la formación docente, al logro de una sociedad menos conflictiva donde el valor de la convivencia se pueda poner en práctica. El mismo se basa en la reflexión y el debate de algunos temas implícitos en la película, lo que facilitaría al alumno-espectador, a través de lo placentero, la experiencia de la revisión de los viejos roles que aparecen fruto de la relación del propio espectador con otros cuentos e historias y de otras cuestiones, no menos importantes, como la aceptación del otro, el poder, las diferencias sociales, corporales, sexuales, étnicas, culturales, etc.
Prácticas evaluativas alternativas en contextos virtuales de aprendizaje
Authors: Colmenares Escalona Ana Mercedes
Published: September 2021

El presente artículo reporta los resultados de una investigación que se llevó a cabo a través de la gestión de un curso en línea denominado “Evaluación de los aprendizajes en entornos virtuales”. El propósito fundamental del mismo fue contribuir a la formación de los docentes en el área de evaluación de los aprendizajes y propiciar prácticas de autoevaluación y coevaluación, orientadas por la perspectiva denominada Evaluación Formadora, en la cual el protagonismo del participante y el desarrollo de la autonomía académica constituyen el eje central del aprendizaje. Para la ejecución de la experiencia se diseñó un programa, un cronograma de actividades, una propuesta de evaluación y se consensuó una planificación de la investigación, bajo la metodología de la investigación acción. El grupo estuvo constituido por 20 docentes. Las técnicas utilizadas fueron la observación, grupos focales y análisis de registros. Entre los hallazgos de esta experiencia investigativa, se evidenciaron desplazamientos significativos en las concepciones de la evaluación de los aprendizajes en contextos virtuales que tenían los docentes y se logró la participación de todos en la construcción de una nueva visión sobre la evaluación en estos contextos apoyados por las tecnologías de la información y la comunicación.
Indicadores de flexibilidad en carreras universitarias de grado
Authors: Crosa Lorena , Soubirón Emy
Published: September 2021

Con el propósito de analizar la flexibilidad en dos diferentes planes de estudio de una misma carrera de grado a nivel universitario, se realizó una búsqueda bibliográfica de indicadores que dieran cuenta de la misma.

Como resultado de esa búsqueda, en el presente trabajo se definen una serie de indicadores de flexibilidad curricular y se analizan los resultados de su aplicación. Se trabaja con cinco indicadores que dan cuenta de la comunalidad, de la autonomía y especificidad así como de las posibilidades de movilidad intra e intercarreras.

Los resultados se presentan en forma de tablas comparativas para ambos planes y se comentan los aspectos más relevantes en relación a los valores obtenidos.
A auto-avaliação de IES: um modelo para a avaliação das disciplinas curriculares segundo a percepção do corpo discente
Authors: Policani Freitas André Luís , Morales de Arica Gudelia
Published: September 2021

Em um cenário caracterizado pela expansão crescente do sistema brasileiro de educação superior, em termos da quantidade de novas Instituições de Ensino e de novos cursos (presenciais e semi-presenciais), o desenvolvimento e a implementação de um sistema de avaliação educacional é um dos procedimentos utilizados para monitorar o desempenho das Instituições de Ensino Superior (IES) e assegurar que a qualidade do ensino atende aos padrões desejados.

Desejando contribuir para o tratamento deste problema, este artigo propõe um modelo destinado à auto-avaliação de IES fundamentado na avaliação das disciplinas curriculares sob a percepção do corpo discente. Através da realização de um experimento, verificou-se a confiabilidade do instrumento de pesquisa utilizado (questionário) na avaliação das disciplinas do curso de Graduação em Engenharia de Produção de uma universidade pública estadual. Algumas análises foram realizadas e os resultados são apresentados.
Talleres curriculares basados en el enfoque histórico cultural
Authors: González Rivero Berta
Published: September 2021

El artículo trata acerca de un nuevo componente incorporado a un plan de estudios a partir de la aplicación del enfoque histórico cultural. Se denominan Talleres y están dirigidos a lograr una posición activa del estudiante con respecto a su profesión. Los Talleres creados son de dos tipos: Talleres de Integración y Talleres Formativos. Se conceptualizan y se da su forma de instrumentación.
Discusiones conceptuales en el campo de la cultura escrita
Authors: Kalman Judith
Published: September 2021

A partir de la década de los sesenta, la cultura escrita comenzó a ser un campo ampliamente discutido que abarcaba un número de disciplinas ubicadas en el marco de las ciencias sociales y humanidades, tales como teoría literaria, antropología, sociolingüística, psicología, historia, lingüística, semiótica y análisis del discurso, entre otras. Por esta razón, este documento es, necesariamente, una selección de temas posibles y de ninguna manera pretende agotar las discusiones conceptuales de la cultura escrita. Ofrece un panorama de información general, algunos ejemplos, formulaciones y debates en torno a la definición de la cultura escrita, sus consecuencias y su aprendizaje, sin pretender abarcar el campo completo. Todas las selecciones son forzosamente subjetivas, pues elegir implica incluir y excluir simultáneamente. Por esto, la intención de la autora no ha sido presentar una selección «objetiva» de textos y argumentos, sino articular aquellas fuentes e ideas que le han sido más útiles en la conformación de su pensamiento, investigación y enseñanza.
Ideas filosóficas que fundamentan la pedagogía de Paulo Freire
Authors: Santos Gómez Marcos
Published: September 2021

El propósito del presente trabajo es destacar algunos fundamentos teóricos de la pedagogía de Paulo Freire dentro del campo de la filosofía del siglo xx. Esta es una tarea necesaria para esclarecer los puntos esenciales de una perspectiva pedagógica de enorme importancia en la alfabetización y educación de adultos en América Latina. El autor se ha centrado, en especial, en los pensadores que se relacionan con tres aspectos vitales en este enfoque: 1) Las ideologías como elementos de reproducción social y su superación mediante la «concientización»; 2) La ubicación del punto de partida para el proceso educativo-alfabetizador en la situación límite que vive el oprimido; 3) La naturaleza dialógica del ser humano y su fundamental apertura.
Designing the User
Authors:   The Ohio State University, Canizares Galo
Published: September 2021

This paper puts forth a set of criteria for analyzing users. Putting aside the techno-positivism pervading traditional user-centered design, the questions asked here prioritize a narrative approach focusing on conflicts, absurd scenarios, and weird collaborations between software and users. Designing the user thus could be seen as an exercise in creati ng problems as much as solving them.
False Prophets
Authors:   University of Miami, Barnes Germane
Published: September 2021

Architecture education routinely manifests deity-like figures. They are placed on pedestals and their work, whether theoretical or actualized, acquires a holistic reverence. Rem Koolhaas, Jane Jacobs, etc. are architectural prophets that influence history, theory and practice. Explicitly or implicitly, their texts show clear bigotry and privilege. Jacobs states, “In some city areas-older public housing projects and streets with very high population turnover are often conspicuous examples—the keeping of public sidewalk law and order is left almost entirely to the police and special guards. Such places are jungles”.
The Pedagogy of Creative Placemaking: A Field Begins to Come of Age
Authors:   PolicyLink, Rubin Victor , Tchida Celina , Jackson Maria Rosario , Hwang Theresa ,   Arizona State University,   Arizona State University,   Dept. of Places
Published: September 2021

Creative placemaking has been evolving from a narrow definiti on of applying art and design ideas to community projects into a more expansive, equity-focused field of practice. As the funder consortium Art Place America describes it, “Creati ve placemaking happens when artists and arts organizations join their neighbors in shaping their community’s future, working together on place-based community outcomes. It’s not necessarily focused on making places more creative; it’s about creatively addressing challenges and opportunities…. creative placemaking at its best is locally defined and informed and about the people who live, work, and play in a place.”
A Meta-analysis of the Impact of COVID-19 on Student Achievement
Authors: Storey Nathan , Zhang Qiyang
Published: September 2021

Despite increasing evidence calculating the extent of COVID learning loss, few researchers have attempted to collect and examine the evidence through meta-analysis. To fill this gap, our meta-analysis seeks to explore the existing research regarding the effects of COVID on learning in reading and mathematics. Our findings illustrate that the learning loss was real and significant compared to previous school years. Applying our rigorous inclusion criteria informed by the best evidence synthesis methodology, we identified 30 eligible studies. On average, meta-regression results showed that students lost 0.21 (p = 0.006) standard deviations of learning during the pandemic school closures. Moderator analysis further showed none of the group comparisons are statistically significant. Marginal means revealed that students lost more in reading compared to math, younger students lost more compared to older students, and students in the U.S. were more negatively affected than students from other countries.
Análise e otimização do processo de predição de demanda de peças de reposição com ênfase na demanda intermitente
Authors: de Almeida Sérgio Neri , Martins José Helvécio
Published: September 2021

O planejamento tem sido um fator de sucesso em muitos segmentos de negócios e está cada vez mais sendo aprimorado e assumindo maior importância nas organizações. Não é diferente no setor de manutenção cuja necessidade de implementação se torna ainda mais evidente, já que requer recursos significativos das empresas. No caso do recurso "peças de reposição", o planejamento envolve principalmente a predição de demanda, usualmente procurando um prognóstico de evento que ocorrerá no futuro com base em dados passados. Quando executado adequadamente, o planejamento pode otimizar o estoque, obtendo o nível de serviço necessário e minimizando a falta ou excesso de peças. Para um grande número de itens, nos quais o monitoramento preditivo de todas as partes é impraticável, um processo usado é a análise de séries temporais históricas com técnicas econométricas e estatísticas. No entanto, uma questão recorrente é que, devido à característica de muitos itens de reposição, sua demanda é intermitente, com muitos intervalos sem consumo intercalados com a demanda real. Essa característica aumenta a incerteza da predição, juntamente com outras incertezas, como a obsolescência de peças e mudanças nos cenários interno e externo das empresas. Para propor melhorias nesse processo, este livro procurou analisar a demanda por peças de reposição, principalmente intermitente, de uma empresa do setor de manutenção de usinas de mineração. Foram aplicados métodos de predição descritos na literatura, tanto os convencionais quanto os mais recentes, e os recursos de otimização de parâmetros presentes no algoritmo de uma rotina computacional específica disponível na plataforma R-Studio. De acordo com os métodos de estimação e otimização utilizados, foram encontradas indicações do benefício dessas técnicas, conforme as medidas de erro utilizadas. Para pesquisas futuras, sugere-se uma associação com o aprendizado de máquina, que é uma área dedicada ao desenvolvimento de algoritmos que aprendem com os dados e contribui para o processo de modelagem e predição.
Manejo quirúrgico de la hidatidosis hepática en esta última década: ¿Qué hemos aprendido?
Authors: Pinto Guerrero Pedro Pablo
Published: September 2021

El manejo clínico de la hidatidosis hepática es complejo y se basa fundamentalmente en tres pilares: quirúrgico, percutáneo y farmacológico; los cuales en ocasiones pueden ser complementarios.La terapia debe definirse en función de las características, ubicación y tipo de quiste; a lo cual debe sumarse la experiencia del equipo médico, recursos disponibles y la adherencia de los pacientes al monitoreo a largo plazo.La cirugía es el tratamiento más utilizado, las técnicas percutáneas posiblemente puedan reemplazar a la cirugía en casos específicos. Sin embargo, a pesar de los avances en las técnicas quirúrgicas, en el uso de la quimioterapia y otros tratamientos, el manejo de hidatidosis hepática sigue siendo un problema importante, debido principalmente a la falta de consenso sobre que procedimiento a utilizar es mejor.El objetivo de esta presentación es dar a conocer el amplio abanico de terapias existentes en el actual manejo de la hidatidosis hepática, así como indicar algunas sugerencias en la utilización de cada una de ellas. Echinococcosis quística; clasificación ultrasonográfica; cirugía; tratamiento percutáneo; laparoscopía.
Prevalencia de Síndrome de Burnout en Anestesiología y Cirugía Ortopédica en un centro en Chile
Authors: Losada Morales Hector Fabio , Astudillo Díaz Paula Rosaisabel , Fernadez-Carriba Samuel , Jara Ibaceta Jimena Isabel
Published: September 2021

Objetivo: Evaluar el agotamiento emocional o cansancio emocional, realización personal y despersonalización en el quehacer de los médicos del Servicio de Traumatología y Pabellón Central del Hospital Hernán Henríquez Aravena (HHHA) y Departamento de Cirugía de la Universidad de La Frontera Temuco, Chile.Material y método: Corte transversal. 48 sujetos: 10 residentes de traumatología y 8 de anestesiología,  12 anestesiólogos y  18  traumatólogos académicos asistenciales. Se aplicó bajo consentimiento informado: Inventario de Maslash (MBI). Análisis: tendencia central, porcentaje, así como t de student y coeficientes de alfa de Cronbach.Resultados: La prevalencia global del síndrome de burnout es 97%,  por dimensiones, cansancio emocional mostró una prevalencia del 100% ; baja realización personal en el trabajo 100%, y  despersonalización   91,6% Para traumatología:  cansancio emocional mostró prevalencia 100% ; baja realización personal en el trabajo 100% , y  despersonalización  82% . Para anestesiología: cansancio emocional mostró prevalencia 75%; baja realización personal en el trabajo 30%, y  despersonalización  30%. Existen diferencias significativas en cansancio emocional siendo mayor en género femenino y en quienes duermen menos de 7 horas. El coeficiente de alpha de Cronbach del MBI fue de 0,7.Conclusión: Tanto residentes como académicos asistenciales de traumatología y anestesiología mostraron un elevado cansancio emocional que coexiste con una  baja realización personal en el trabajo y alta despersonalización. En Chile, las políticas de protección están principalmente enfocadas en la Seguridad y Salud Ocupacional con la gestión de los riesgos, pero no se observan políticas de protección al estrés y salud mental que involucren contención y apoyo a la labor terapéutica de los profesionales de la medicina.
Resultados en el corto y mediano plazo del tratamiento endovascular en la enfermedad arterial obstructiva infrapoplítea en pacientes con isquemia crítica de una extremidad
Authors: García Oneto Daniel Alejandro , Bombin Franco Juan , Poblete Saavedra Angela , Concha Argomedo Alfonsina , Zegarra Imaña Iver
Published: September 2021

Objetivo: Mostrar los resultados en el corto y mediano plazo del tratamiento  endovascular de angioplastia transluminal percutánea (ATP) con balón en pacientes en estado de isquemia crítica por enfermedad arterial obstructiva infrapoplítea. Materiales y Método: Estudio descriptivo, observacional, retrospectivo. Se incluyeron los pacientes hospitalizados entre 2009 y 2018 por isquemia crítica Fontaine III o IV sometidos a una ATP del territorio infrapoplíteo. Se observó como objetivos primarios la preservación de la extremidad afectada y la mortalidad post-operatoria y a un año plazo, y como objetivos secundarios los procedimientos adicionales en pacientes con lesiones o necrosis distales, estadía hospitalaria, complicaciones postoperatorias y necesidad de reintervención. Resultados: Se incluyeron 42 pacientes con un promedio de edad de 66 años (46 – 82), 95,2% tenía antecedentes de hipertensión arterial, 85,7% diabetes mellitus, 57,1% tabaquismo y 28,5% enfermedad renal crónica. Un 83,3% ingresó en etapa Fontaine IV. De las arterias intervenidas 36,2% correspondió al tronco tibioperoneo, 25,8% la tibial anterior, 22,4% la tibial posterior y 15,6% peronea. En 16 casos se realizó una angioplastía percutánea en más de una arteria. No se colocó stents. Se presentaron complicaciones en 3 pacientes, 2 requirieron una amputación mayor y en otro se debió efectuar un nuevo procedimiento endovascular de rescate. La estadía hospitalaria promedio fue 22 días. No hubo mortalidad precoz post-procedimiento. La mortalidad global a un año fue 9.5%. A todos los pacientes en etapa Fontaine IV se les efectuó algún procedimiento adicional, a 31 una amputación menor, 3 cerraron sus lesiones por segunda intención y en otro se realizó un injerto dermo-epidérmico. De los 35 pacientes con seguimiento, 77% preservó su extremidad a un año. Conclusión: La reparación endovascular mediante una angioplastia percutánea en pacientes con isquemia crítica por compromiso infrapoplíteo es un procedimiento seguro y tiene una alta tasa de preservación de la extremidad inicial y a un año de seguimiento, aunque se trató de pacientes con alta incidencia de comorbilidades.
Physical Layer Performance Modeling of Modern Multicarrier Modulation Techniques
Authors: Anwar Waqar , Kumar Atul , Franchi Norman , Fettweis Gerhard
Published: September 2021

This paper propose physical layer abstraction for multicarrier modulation techniques which could be used to speed up system-level simulations.
Studies on Underwater Electric Discharge and Associated Pressure Waves
Authors: Chernyak Valeriy , Iukhymenko Vitalii , Martysh Evgen , Nedybaliuk Oleg , Fedorovich Oleg , Shevel Valeriy , Popkov Volodymyr
Published: September 2021

Pulsed electric discharges in a liquid with the sufficiently wide range of energy contributions to them can generate diverging shock waves. А significant part of this energy is carried away by these waves from the center of the system to its periphery. At the same time, pulsed plasma-liquid systems limited by reflecting walls of both cylindrical and spherical geometry are insufficiently studied. A fundamental feature of such systems is the generation of a sequence of both diverging and converging (reflected) shock waves by a single pulse discharge. It was shown earlier that in a cylindrical plasma-liquid system with a height of the cylinder (h) comparable with the interelectrode distance (d), radius of the cylinder base R (at R >> h), when discharge current is increased, the ratio of the second diverging shock wave amplitude to the amplitude of the first diverging shock wave can be → 1. This leads to effective return of the energy carried away to the periphery back to the center of the system by converging shock waves. The collapse of the converging shock waves and initiated processes in the center of such plasma-fluid systems can be very interesting. The paper presents the results of experimental studies of pulsed cylindrical plasma-liquid system using both H2O and a mixture of H2O / D2O and pure D2O as a liquid. The energy-storage capacitor is charged by using a high voltage DC power supply (up to 70 kV).