bluuebunny/crossref_metadata_2025 huggingface dataset:
Versorgungswirksamkeit der arbeitsmedizinischen Ausbildung in Österreich
Authors:   Österreichische Akademie für Arbeitsmedizin und Prävention (AAMP), Wien, Koth Stefan , Hochgatterer Karl ,   Österreichische Akademie für Arbeitsmedizin und Prävention (AAMP), Wien
Published: February 2022

Die Österreichische Akademie für Arbeitsmedizin und Prävention (AAMP) führte eine Erhebung über die Aufnahme einer arbeitsmedizinischen Tätigkeit nach Abschluss der Arbeitsmedizin-Ausbildung sowie über die Gründe für beziehungsweise gegen die Entscheidung, arbeitsmedizinisch tätig zu werden, durch. Aus den Ergebnissen lassen sich Rückschlüsse für die Bedarfsberechnung, für gezielte PR-Maßnahmen zur Förderung des arbeitsmedizinischen Nachwuchses sowie für die inhaltliche und strategische Überarbeitung des Berufsbilds Arbeitsmedizinerin/-mediziner ziehen.
Cannabis konsumierende Beschäftigte
Authors:   BASF SE, FEH-AP, Ludwigshafen am Rhein, Hupfer Kristin
Published: February 2022

Beim Suchtmittelkonsum steht im betrieblichen Alltag nach wie vor der Alkohol an erster Stelle. Doch an zweiter Position folgen dann schon die Beschäftigte, bei denen ein problematischer Cannabiskonsum vermutet oder diagnostiziert wird. Sie unterscheiden sich in Alter, Konsummotiven und Bindung an den Betrieb deutlich von den Alkoholauffälligen. Einen Sonderfall stellt die Personengruppe dar, die Cannabis auf Rezept nimmt. Mit den Erfahrungen hinsichtlich dieser Gruppe steht die Forschung noch am Anfang. Der Beitrag berichtet von den Untersuchungen und Erfahrungen des betriebsärztlichen Dienstes eines weltweit agierenden Chemiekonzerns.
Geringe anti-SARS-CoV-2-Seroprävalenz unter Beschäftigten des Öffentlichen Dienstes in Bremen
Authors:   Performa Nord, Zentrum für Gesunde Arbeit, Bremen, Neumann Jan , Zeeb Hajo ,   Leibniz-Institut für Präventionsforschung und Epidemiologie – BIPS, Bremen, Dotzauer Andreas ,   Laboratorium für Virusforschung, Universität Bremen, Janssen-Weets Oliver ,   Laboratorium für Virusforschung, Universität Bremen
Published: February 2022

Low anti-SARS-CoV-2 seroprevalence among public sector employees in Bremen An epidemiological observational study was conducted in order to estimate seroprevalence (SARS-CoV-2 serology) among public sector employees in the state of Bremen by using an established ELISA test system. Those who took part were police officers, firefighters, rescue personnel, health workers and administrative staff who worked despite the lockdown and may have been in contact with COVID-19 infected individuals. The results show a small number of previously undiscovered cases (3/281) and, in addition, a low seroprevalence (2.1 %; 6/281) among public service employees. We believe this data is important for further research and for epidemiological purposes. It may also be useful for decision makers. Keywords: COVID-19 – virology – epidemiology – seroprevalence – unreported cases
Kein Vorrang des Beamtenrechts bei beruflicher Asbestexposition als Bystander
Authors: Holtstraeter Reinhard
Published: February 2022

Fernmeldehandwerker, Entstörer und andere Mitarbeiter in den Fernmeldestellen der Deutschen Bundespost waren in den Jahren bis ca. 1985 vielfach als Bystander asbestexponiert. Von der zuständigen Berufsgenossenschaft wird bei verbeamteten Versicherten grundsätzlich die Anerkennung einer Berufskrankheit nach den Ziffern 4103, 4104 oder 4105 mit Hinweis auf ein Urteil des Bundesverwaltungsgerichts verweigert. Danach soll bei Beamten die Asbestgefährdung durch den Aufenthalt in belasteten Räumen (Bystanderexposition) nicht der dienstlichen Verrichtung zugeordnet sein und daher kein beruflich bedingtes Risiko bestehen. Für Gefährdungszeiten als Angestellte im Öffentlichen Dienst sind demgegenüber – auch bei späterer Verbeamtung – Bystanderexpositionen nach dem SGB VII als berufsbedingte Gefährdung anzuerkennen.
Arbeitsverdichtung im Branchenüberblick – Erkenntnisse aus dem Risikoobservatorium der Deutschen Gesetzlichen Unfallversicherung (DGUV)
Authors:   Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA), Sankt Augustin, Hauke Angelika , Flaspöler Eva ,   Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA), Sankt Augustin, Klüser Ruth ,   Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA), Sankt Augustin, Neitzner Ina ,   Institut für Arbeitsschutz der Deutschen Gesetzlichen Unfallversicherung (IFA), Sankt Augustin
Published: February 2022

Welche Bedeutung hat Arbeitsverdichtung in den verschiedenen Branchen? Und wie hängt sie mit weiteren Entwicklungen der Arbeitswelt zusammen? Das Risikoobservatorium der DGUV gibt Einblicke in verschiedene Branchen sowie Hinweise auf mögliche Stellschrauben, um gesundheitsgefährdenden Auswirkungen von Arbeitsverdichtung entgegenzuwirken.
Telearbeit in Deutschland: Männer und Frauen im Vergleich
Authors:   Bundesanstalt für Arbeitsschutz und Arbeitsmedizin (BAuA), Dortmund, Tisch Anita , Backhaus Nils ,   Bundesanstalt für Arbeitsschutz und Arbeitsmedizin (BAuA), Dortmund, Wöhrmann Anna M. ,   Bundesanstalt für Arbeitsschutz und Arbeitsmedizin (BAuA), Dortmund
Published: February 2022

Teleworking in Germany: a comparison of men and women Objectives: The increasing dissemination of information and communication technologies had already contributed to an increase in working from home before the Covid-19 pandemic. Nevertheless, only a comparatively small proportion of employees in Germany have a teleworking agreement. This article examines how the extent and scope of contractually agreed teleworking differs among men and women in Germany. We further consider the importance of different life situation in this context and whether there are any gender-specific preferences. Methods: The gender-specific prevalence of teleworking as well as the wish to do so and any possible obstacles are examined in more detail using data from the BAuA Working Time Survey. The BAuA Working Time Survey has been carried out every two years since 2015 and is a panel survey that initially comprised more than 20,000 employees. For the descriptive analyses, dependent employees up to the age of 65 were taken into account (2015: n = 18,119; 2017: n = 8767; 2019: n = 8622). Results: The share of employees with contractually agreed teleworking has increased since 2015. Whilst a larger share of men had a teleworking agreement in 2015, the proportions of men and women have equalized in 2019 (17 per cent of men and 16 per cent of women). The proportion of employees with a teleworking agreement has increased across all life situations. The largest increase can be found among women with children under six years of age. The preference for teleworking has also increased among both men and women. Conclusions: Teleworking agreements are found increasingly equally distributed between men and women. Younger cohorts and mothers with young children benefit particularly from the expansion of teleworking arrangements. Thus, teleworking appears to be popular for reconciling family and work. Keywords: home office – teleworking – gender differences – development over time – BAuA Working Time Survey
Mikroorganizmusok szerepe a szúbogarak (Curculionidae, Scolytinae) ökológiájában
Authors: Balázs Balázs Gábor , Tuba Katalin , Lakatos Ferenc
Published: February 2022

A szúbogarak (Curculionidae, Scolytinae) egyes fajai, különösen fenyőerdőkben, a legveszélyesebb erdei károsítók közé tartoznak. A legtöbb szúfaj általában nem támad meg, nem pusztít el egészséges fákat, hanem a legyengült egyedeket, valamint az elpusztult fákat kolonizálja sikeresen. Egyes fajok azonban bizonyos abiotikus tényezők hatására (tartósan meleg és száraz időjárás, széltörés, hótörés) tömegesen elszaporodhatnak, így gazdasági és ökológiai hatásuk jelentős. A bogarak táplálkozásában, a gazdanövény sikeres kolonizálásában, a gradációjukban fontos szerepet játszanak a szúkkal társult mikroorganizmusok, mint például gombák és baktériumok. Jelen írás célja ezen mikroorganizmusok a szúbogarak életmódjára, valamint a szúk és tápnövényeik közötti interakcióra gyakorolt hatásának bemutatása. Tesszük ezt egy, a ma reneszánszát élő koncepció, a holobiont elmélet szerinti megközelítéssel, vagyis a szúbogarakat és a velük társult mikrobiótát egységes egészként értelmezve.
Çok amaçlı genetik algoritma için yeni bir seçim stratejisi önerisi: MultiMoora Rank seçimi
Authors: DEMİR Alparslan , GELEN Mine Büşra
Published: February 2022

Genetik algoritmalar çözümü zor problemler için kabul edilebilir süre ve kalitede çözüm bulan metasezgisel bir tekniktir. Genetik algoritma uygulamalarında tercih edilen seçim stratejileri, çözüm kalitesini önemli ölçüde etkilemektedir. Bu çalışmada, Çok Amaçlı Genetik Algoritmalar (ÇAGA)’ın performansını arttırmak amacıyla, çok kriterli karar verme yöntemlerinden biri olan MultiMoora metoduna dayalı MultiMoora Rank Seçimi (MMRS) seçim stratejisi geliştirilmiştir. Geliştirilen metodun performansı çok amaçlı akış tipi çizelgeleme problemlerinde test edilmiştir. MultiMoora Rank Seçimi ile elde edilen sonuçlar, genetik algoritmada yaygın olarak kullanılan Rulet Tekerleği Seçimi, Lineer Rank Seçimi ve Turnuva Seçimi metotlarının aynı problem üzerindeki sonuçları ile karşılaştırılarak değerlendirilmiştir. Elde edilen sonuçlar, önerilen MultiMoora Rank Seçimi metodunun karşılaştırılan diğer metotlara üstünlük sağladığını göstermektedir.
Mapping Indonesian EFL Teachers’ Perception and Practice of Technology Integration
Authors: Setyaningsih Endang , Wahyuni Dewi Sri , Rochsantiningsih Dewi
Published: February 2022

The growing number of 2.0 studies indicated the increasing tendency to integrate technology into EFL teaching. Reports on teachers' perception of and practice of technology integration can easily be found in research databases. Nevertheless, quite a few laid attempts to map and build a tentative connection between perception and practice. This study examined teachers' current practice and their perception of technology integration. The respondents of this study were 40 English teachers from 20 senior high schools in a district in Indonesia. To collect the data, a technology integration questionnaire (TIQ) was developed based on pre-existing instruments. The responses were analyzed using both quantitative and qualitative strategies. The study found that, first, the teachers commonly held positive views on the use of technology although they also indicated their alert on the challenges and requirements for the success of the implementation. Second, the responses suggested that there was a connection between teachers' perception and their technology integration practice. Third, viewed from the SAMR model, the teachers' technology integration practice mainly fell into substitution and augmentation. Categorization of the technology integration purpose, practice, and process is discussed further. The study concludes teachers’ practice tended to focus more on the technology but less on the teaching and learning.
Investigation of Current Digital Divide Between University Lecturers and Students in the English as a Foreign Language Context in North Bali
Authors: Artini Ni Nyoman , Santosa Made Hery , Suwastini Ni Komang Arie
Published: February 2022

Many experts argue that the digital divide has shifted from a gap in access to a gap in the skill to use information and communication technology (ICT). However, some people still have difficulties in getting access to ICT despite the advancement and increasing access and affordability of technology. Reflecting on this problem, this study aimed at finding out whether the digital divide between the lecturers and students of English as a Foreign Language existed and in what aspects the digital divide happened. This research was quantitative, with the data collected through an online survey involving 12 lecturers and 88 students in their third year. The findings revealed that both the gap in access and the gap in use existed between both groups. The result calls for the attention of the stakeholders and policymakers on the improvement of the quality of access to ICT as well as on the advancement in the use of technology, especially for the teachers so that they can keep up with the younger generation.
“Teaching is God’s Calling”: Teachers’ Beliefs and Professional Identity at Ten Christian Schools in Indonesia
Authors: Yumarnamto Mateus , Prijambodo Vincentius Luluk
Published: February 2022

Teachers’ beliefs and their roles in the classroom may change over time as they are more informed about the profession from their own experiences, from their colleagues, and from their continuing education. In this study we investigated teachers’ beliefs and roles at 10 Christian schools in East Java, Indonesia to see how their beliefs influence their professional identity development. The data were collected from 107 teachers who participated in semi-structured interviews and who wrote reflective essays as a part of their career development program. The data were analyzed in the framework of narrative inquiry to see the emergent themes. The findings suggest that the most salient beliefs among the participating teachers are the beliefs which are based on their Christian affiliation. These salient beliefs and Christian identity of the teachers could enhance their positive image as teachers and could motivate them to be better teachers. However, the salient religious identity may also be able to be hindrance for teacher agency to solve problems in their practices as the beliefs can be the shielding for their reluctance to change.
Gender Stereotypes As Hidden Curriculum: A Case of Vietnamese English Textbooks
Authors: Phan Anh , Pham Tho Xuan
Published: February 2022

Gender equality and women empowerment have become a buzzword for development during the past decades with numerous national and international policies, including educational policies. However, gender equality is normally conceptualized in quantitative terms of education such as low disparity in access to education between boys and girls while qualitative aspects of gender equality are still left uncontested, among which is gender stereotypes in hidden curriculum. Gender stereotypes as a social construct, once imbedded in education and educational materials, certainly intervene the gender socialization process of students. The paper attempts to investigate this issue by employing a mixed qualitative and quantitative content analysis of the illustrations in English textbooks for Upper-secondary students in Vietnam. The analysis reveales stereotypes reflected in three main areas: occupations, sports and pastimes, and life duties, all of which confirm social and cultural norms of Vietnamese society towards a woman.
Autotradução acadêmica: o caso da produção publicada no periódico acadêmico periférico plurilíngue Ecos de Linguagem
Authors: Antunes Maria Alice
Published: February 2022

Um conjunto de práticas é implementado pelas instituições de ensino superior no Brasil com vistasà internacionalização do conhecimento acadêmico-científico de seus pesquisadores. Uma delas é acriação de periódicos bilíngues. É inegável o papel da tradução nesse processo. Destaco a autotraduçãoacadêmica, considerada como a tradução de um texto de especialidade executada pelo autor--pesquisador que o escreveu originalmente. Neste artigo, analiso o caso do Ecos de Linguagem, umperiódico multilíngue, do Instituto de Letras (Universidade do Estado do Rio de Janeiro —uerj—).Discuto a publicação em periódicos acadêmicos através da autotradução e como esses fenômenosrelacionam-se. O periódico incentiva a leitura em diversas línguas sem abrir mão da publicação emportuguês. Entre 2012 e 2018, foram publicados 6 números bilíngues, com 57 artigos, 49% dos quaistraduzidos pelos próprios autores. Contrariando prática frequente, entre 2012 e 2015, o Ecos de Linguagemtorna visível o nome do autotradutor. Contrariando também a prática mais frequente datradução para o inglês, o Periódico publicou, entre 2012 e 2015, seis números bilíngues: um emportuguês/italiano, um em português/francês, três em português/espanhol e um em português/inglês. Este artigo apresenta um estudo de caso com autores que participaram do número em português/francês. Utiliza entrevistas semiestruturadas com um pesquisador por vez —e e-mails paraesclarecer pontos específicos levantados durante as entrevistas— realizadas através de aplicativo desoftware de videoconferência. A análise dos dados foi feita com base na tipologia de autotraduçãoconcebida por Jung (2002). Os resultados indicaram a necessidade da ampliação dessa tipologia coma inclusão de dois critérios: o suporte e a modalidade.
Collateral damage of fipronil in economic and ecologically important non-target species
Authors: Villar David , Schaeffer David J
Published: February 2022

Fipronil is an insecticide and acaricide widely used in agriculture and domestic animals worldwide. Ecotoxicology studies have shown that, even at the low concentrations used on target species, fipronil and its degradation products have a significant impact on non-target species, either by direct toxicity or indirect effects affecting the food chain. The negative effects of fipronil on non-target species of terrestrial and aquatic invertebrates and indirect effects on food chains have led to its use being banned or severely restricted in numerous countries, including all of the European Union, China, and the United States. Some of the species highly susceptible to fipronil are of great economic and ecological importance, including crayfish, brown shrimp, and bees. In particular, the impact on decimating bee hives worldwide is an example of fipronil´s undesirable effects on agriculture. Other species affected by fipronil -for which there are few studies- are biological predators of the same pests controlled by fipronil. Considering all the impacts on non-target species, the commercialization and indiscriminate use of fipronil in agriculture seem irresponsible. In Colombia, as of September 2021 and pressed by local beekeepers, the Instituto Colombiano Agropecuario (ICA) prohibited its use on avocado, coffee, citrus, and passiflower plantations. However, as long as its use is not prohibited in all agricultural applications, farmers could divert its use and continue using it in any other type of plantation. This paper describes the impact of fipronil on some of the beneficial invertebrate species of outmost economic and ecological importance.
Organ-saving operation with th use of vascu- larised autografts in patients with malignant tumors of extermities
Authors: Machson A. N. , Burlakov A. S. , Denisov K. G.
Published: February 2022

Organ-saving operations with the use of vascularised autografts were carried out in 134 patients with malignant tumors of extremity. Depending on the type of tumors processes the surgical method was applied either as an independent one or in combination with radio- and chemotherapy. In 8 patients the restoration of soft tissue defects was required, in 9 patients the restoration of bone defects was required, and in 17 patients had vast bone- soft tissue defects as well as defects involving large joints. In patients with the defetcs which required only restoration of soft tissue scapular (1), thoracodorsal (5) flaps and simultaneously two flaps on the common or separate vascular pedicles were applied (2). The length of bone defects ranged from 12 cm to 30 cm, in overwhemling majority of cases (22) it exceeded 20 cm. Due to real danger of graft fracture under load in vast bone defects of low extremities the double graft from fibula (2) or two bone grafts from both fibulae were used when possible (5). Osteosynthesis was carried out by plates, and by different extrafocal fixation devices. The grafts healing was 100%. In one case there was a complication in the donor zone manifested by necrosis of the remained part of fibulae muscles after fibula was taken. It was considered to be a result of technical mistake. The method allowed to improve significantly the functional results of treatment in patients with malignant tumors of the extremities.
Tibial syndrome in patients with infantile cerebral paralysis. Surgical treatment
Authors: Perkhurova I. S. , Zhuravlev A. M. , Osipov A. I. , Gorchiev B. M.
Published: February 2022

The authors suggest the original conception of the development of so-called tibial syndrome that is the typical one for patients with infantile cerebral paralysis. The significance of tibial synkinesis being pathognomonic for pyramidal lesions in the formation of a peculiar severe locomotor pathology is detected. This severe locomotor pathology is a tibial syndrome. The authors emphasize that tibial syndrome is often a failured outcome of surgical intervention for foot equinus in young children. New surgical technique that eliminates the main pathologic components of tibial syndrome: flexion contracture of the knee joint, crus anterversion, redundant dorsal foot flexion, and improves the posture and gait is suggested.
A case of successful treatment of chronic transdental dislocation of the atlas using a halo device
Authors: Vetrila S. T. , Kolesov S. V.
Published: February 2022

Chronic transdental dislocations of the atlas are among the most severe spinal injuries. In this area, the vertebral arteries, spinal cord, cranial nerves are in close contact. According to the literature [3], severe neurological symptoms develop in 25% of cases with fractures of the C2 odontoid process.
The role of the front-line triage and evacuation hospital of the first line in the medical support of troops during the battle of Moscow and at subsequent stages before the capture of Koenigsberg
Authors: Kaplan A. V.
Published: February 2022

50 years have passed since the Victory of the Soviet people in the Great Patriotic War of 1941-1945, but the memory reliably preserves the events of that time... The war was hard, painful and bloody, the victory over the formidable, strong, insidious enemy went to our people at the cost of enormous efforts , suffering and sacrifice. Physicians, including surgeons, were no exception, and they faced enormous difficulties, and the war demanded many sacrifices from them. We remember our friends and comrades and pay tribute to their memory.
Some principles of organizing orthopedic care in Germany
Authors: Cadner P. , Mattis E. R.
Published: February 2022

Orthopedic care in Germany provides for the prevention, diagnosis and treatment of congenital and acquired functional disorders, diseases, injuries and consequences of injuries of the musculoskeletal system, as well as rehabilitation treatment (rehabilitation) of patients with pathology of the musculoskeletal system, i.e. in its content, orthopedics as a discipline in Germany corresponds to traumatology and orthopedics in Russia.
II Congress of the European Federation of National Associations of Orthopedic Traumatologists
Authors: Kuropatkin G. V. , Korolev A. V.
Published: February 2022

From 2 to 7 July 1995 in Munich, under the auspices of the European Federation of National Associations of Orthopedic Traumatologists (EFORT), a major forum of traumatologists and orthopedists of Europe was held. 30 national associations of orthopedic traumatologists, 17 specialized European societies took part in its work. For 7 days, more than 1.5 thousand participants were able to exchange scientific and practical experience, having listened to a total of 505 messages, familiarized themselves with 482 poster presentations, 57 video demonstrations.
Fault Source Model and Stress Changes of the 2021 Mw 7.4 Maduo Earthquake, China, Constrained by InSAR and GPS Measurements
Authors: Hong Shunying , Liu Mian , Liu Tai , Dong Yanfang , Chen Lize , Meng Guojie , Xu Yueren
Published: February 2022

On 22 May 2021, an Mw 7.4 earthquake struck Maduo, China, within the eastern Bayan Har block of the Tibetan plateau. The eastward-extruding Bayan Har block is marked by active seismicity along its boundary faults, including the 2008 Mw 7.9 Wenchuan earthquake, but large earthquakes within the block are relatively rare. Thus, the Maduo earthquake could provide useful information about crustal deformation of the Tibetan plateau. Early reports, shortly after the earthquake, have suggested a sinistral strike-slip fault rupture, but the fault geometry and slip distribution vary in these models due to the limited observational constraints. Here, we reconstructed a model of fault geometry and coseismic slip using Interferometric Synthetic Aperture Radar and Global Positioning System data. A nonplanar fault model was constructed based on pixel-offset images and the optimized dip angle. The along-strike variation of the dip angle is small, so a single optimized dip is used. Our results suggest that the Maduo earthquake ruptured ∼156 km on a northwest-striking major fault that dips 78°, and ∼24 km on a minor southeast-striking fault that dips 64°. Most fault slip occurred above 15 km depth, and released a moment of ∼1.65×1020  N·m. Using the resolved fault source model, we calculated the change of coulomb failure stress in the region and on the neighboring faults. The Maduo earthquake highlighted intrablock deformation in the Tibetan plateau whereas numerous lithospheric blocks extrude along major strike-slip faults.
Olfactory Dysfunction in a Mouse Model of Fragile X Syndrome
Authors:   , DeBartolo Danielle , Akins Michael R
Published: February 2022

Fragile X syndrome (FXS) is the most common genetic autism-related disorder. FXS results from a loss of fragile X mental retardation protein (FMRP) due to mutations within the FMR1 gene. FXS is characterized by a collection of cognitive and behavioral symptoms including intellectual disability, seizures, autism, social anxiety, attention deficit, and hypersensitivity to sensory stimuli. Sensory abnormalities affect how an individual perceives external stimuli in their environment and these alterations in perception can under line many of the behaviors associated with the syndrome. Fmr1 null mice have altered responses within the olfactory cortex. FMRP is present in virtually every neuron within the olfactory system, including neurons within the olfactory cortex, olfactory bulb, and the peripheral olfactory sensory neurons (OSNs), suggesting that FMRP may play a role not only in odor processing but in odor detection as well. The limited investigations into olfactory hypersensitivity in FXS has largely focused on alterations in sensory processing in the central nervous system, but the role of the peripheral olfactory system is unexplored. We found we found Fmr1 null mice display altered olfactory dependent behaviors indicative of being hypersensitive to odors. Additionally, within the peripheral olfactory epithelium we found alterations consistent with mitochondrial dysfunction and enhanced odor induced responses. Together these data suggest dysfunctional mitochondria within the Fmr1 null olfactory epithelium could possibly contribute to the observed peripheral olfactory dysfunction which could contribute to the alterations in the olfactory cortex and the observed olfactory dependent behaviors.
Two Essays On Mutual Funds
Authors:   , Yadav Pramodkumar , Dorn Daniel
Published: February 2022

The first essay examines whether fund flows of mutual fund family employees are smart. Using hand-collected data on investment of fund family employees, I show that employee flows predict fund performance up to two years. Moreover, employee flows lead flows of other investors, but not vice versa, further indicating that employee flows are smart. The predictive power of employee flows is stronger when fund family employees are located close to fund managers, pointing to employees exploiting their proximity to managers to learn about the managers' skill or effort. The results do not appear to be driven by ownership changes of portfolio managers themselves, family cross-subsidization efforts, plan design, or employee sophistication. The second essay (with Daniel Dorn) examines psychological cost of team structure in mutual fund industry. We show that team-managed mutual funds have a greater propensity to sell winners and hold losers than solo funds. This propensity is costly as winners sold outperform losers held by 56bp during the next quarter relative to stocks with similar size, book-to-market, and momentum characteristics. Disposition effects are strongest when positions are initiated by a subset of the team who thus bears special responsibility. In contrast, there is no disposition effect when positions are initiated by all team members. This suggests that the difficulty of admitting mistakes to peers (vanity), rather than conformity to in-group pressures (groupthink), poses a costly challenge for teams.
Obtención del modelo dinámico simbólico de robots ramificados utilizando grupos de Lie y grafos
Authors: Escalera Juan A. , Abu-Dakka Fares J. , Alhama Blanco Pablo J. , Abderrahim Mohamed
Published: February 2022

En este artículo se presenta una formulación matricial simbólica para el modelado dinámico de robots ramificados, los cuales están compuestos por varias cadenas cinemáticas lineales abiertas. El método propuesto utiliza la mecánica geométrica basada en la teoría de Screws y grupos de Lie para derivar la ecuación de movimiento de Newton- Euler geométrica. La formulación es válida para cualquier robot formado por cuerpos rígidos acoplados mediante juntas de un grado de libertad (por tanto, rotacionales y/o prismáticas) sin formar cadenas cinemática cerradas. Bajo estas condiciones, estos robots pueden ser representados en forma única como un grafo de tipo árbol dirigido. Finalmente combinando la teoría de grafos con la mecánica geométrica se obtiene el modelo dinámico complete de robots ramificados. Además, la formulación propuesta presenta los parámetros intrínsecos del robot explícitamente en términos aislados. De este modo, la ecuación resultante se puede utilizar en algoritmos tales como identificación, simulación y control.
Neuro-fuzzy en el modelado del comportamiento de usuarios-turísticos en eWOM
Authors: Aguilar Rosa María , Torres Jesús Miguel , Méndez Pérez uan Albino , Parra-López Eduardo
Published: February 2022

La tecnología ha cambiado la forma de gestionar los viajes, la relación entre el viajero y las empresas del sector turístico y la forma en que los turistas comparten las experiencias del viaje. La transformación digital se impone para llegar a los nuevos perfiles de viajero, especialmente a los llamados usuarios-turistas de la Tercera Generación, nativos digitales que no entienden el mundo sin estar conectados y se aprovechan al 100% de sus ventajas. En este contexto, las plataformas digitales donde los usuarios publican sus referencias sobre los servicios turísticos recibidos tienen cada vez más peso frente a los contenidos corporativos, creados por las empresas y marcas. Este trabajo tiene como objetivo comprender los patrones de comportamiento de los turistas cuando utilizan las plataformas y comparten las experiencias, así como conocer los efectos que estas plataformas tienen sobre la intención de compra por parte de los usuarios-turistas. En este artículo se presenta el modelado del comportamiento del usuario, para determinar a partir de los comentarios expresados en una plataforma eWOM (boca a boca electrónico), la percepción que se tiene del servicio recibido y cómo se transmite. Para ello utilizamos una metodología neuro-fuzzy que nos permite el aprendizaje de este tipo de sistemas heurísticos. Para obtener un modelo del comportamiento humano, se recurre a la lógica borrosa como herramienta matemática para formalizar la incertidumbre con la que los usuarios se expresan. El aprendizaje de este comportamiento borroso, se realiza a partir de multitud de casos obtenidos de plataformas eWOM, por lo tanto es de utilidad usar las redes neuronales artificiales que infieran los patrones que se presentan en esos datos.
Deep learning en la predicción de generación de un parque eólico
Authors: Torres Jesús , Aguilar Rosa M. , Méndez Juan A. , Zúñiga-Meneses K.V.
Published: February 2022

Uno de los grandes retos tecnológicos actuales es la incorporación de las energías renovables al sistema eléctrico. El objetivo es conseguir que la generación eléctrica sea sostenible y respetuosa con el medioambiente, así como abordable económica- mente. Sin embargo para que esta incorporación tenga éxito es necesario disponer de herramientas de predicción que permitan conocer con suficiente antelación la cantidad de energía de origen renovable que estará disponible para ser inyectada en la red; permitiendo ajustar adecuadamente el resto de fuentes de generación con el objeto de suplir la demanda, incluidas las basadas en combustibles fósiles. Esto permitiría limitar el impacto ambiental y la dependencia con respecto este tipo de carburantes en un previsible escenario de escasez. En este trabajo se quiere avanzar en la creación de dichos modelos de predicción de la generación de los parques eólicos utilizando aprendizaje profundo o deep learning. En este artículo se presenta un modelo de predicción basado en una red neuronal profunda multicapa que, a partir de la predicción de las condiciones atmosféricas, es capaz de estimar 24 horas antes la generación producida por un parque eólico situado en la isla de Tenerife.
Reconocimiento de actividades en el desplazamiento por interiores mediante un teléfono inteligente y señales de oportunidad
Authors: Seco Fernando , Jiménez Antonio R.
Published: February 2022

En este trabajo se estudia cómo las señales de oportunidad pueden ser utilizadas no solo para mejorar la precisión del posicionamiento en interiores, sino también para obtener información valiosa de las actividades que está realizando el usuario. Las señales de oportunidad son aquellas no diseñadas específicamente para posicionamiento, pero presentes de forma natural en muchos entornos, y que pueden ser captadas, por ejemplo, a través de los sensores con los que cuenta cualquier teléfono móvil actual. Se introducen diferentes posibilidades de las señales de oportunidad, dentro de un marco de estimación de la posición bayesiano, y se ilustra su utilidad mediante trayectorias reales realizadas en un edificio de gran tamaño.
Los primeros robots manipuladores aéreos
Authors: Ollero Aníbal , Viguria Antidio , Maza Iván , Trujillo Miguel Ángel , Heredia Guillermo , Cano Raúl , Caballero Fernando , Lasagni Fernando , Acosta José Ángel , de los Santos Silvia , Cobano José Antonio
Published: February 2022

En este artículo se describen los primeros robots manipuladores aéreos dotados con brazos robóticos de seis grados de libertad y capacidades de percepción y planificación que se han desarrollado en el mundo. Estos robots son el resultado del proyecto ARCAS (Aerial Robotics Cooperative Assembly System) coordinado por el primero de los autores y financiado por el Séptimo Programa Marco de la Unión Europea. Los resultados de este proyecto han comenzado a emplearse, entre otros, en el proyecto H2020 AEROARMS y en el español AEROMAIN. El artículo introduce las diferentes plataformas utilizadas en el proyecto y a continuación resume las principales características de los sistemas de control, percepción y planificación desarrollados. Se resume también la integración y validación del sistema.
Clasificador de figuras geométricas trazadas a mano basado en lógica borrosa
Authors: Palomeque Mangut David , Fernández Muñoz J. Álvaro
Published: February 2022

El uso de dispositivos periféricos electrónicos tales como digitalizadoras gráficas y pantallas táctiles, permite al usuario realizar de forma eficiente tareas como la inserción rápida de texto, el dibujo de figuras vectoriales mediante puntos, y la comunicación gestual mediante figuras simples, entre otras. En este trabajo se presenta el diseño de un clasificador software en línea para el reconocimiento de formas geométricas simples trazadas a mano con un único trazo. El sistema de clasificación utilizado se basa en la Lógica Borrosa. El sistema permite clasificar rectángulos, círculos, triángulos y líneas con independencia de su tamaño y orientación. Se han creado dos bases de datos de figuras trazadas a mano compuestas por 80 figuras cada una. La primera base de datos corresponde al conjunto de entrenamiento del clasificador, mientras que la segunda corresponde al conjunto de test. Se han obtenido tasas de reconocimiento del 100% en el conjunto de entrenamiento y del 98.75% en el conjunto de test.
Diseño basado en prestaciones de observadores PI para el diagnóstico de fallos en sistemas lineales con perturbaciones gaussianas
Authors: Sales-Setién Ester , Peñarrocha Ignacio , Dolz Daniel , Sanchis Roberto
Published: February 2022

. Este trabajo aborda el problema de diagnóstico de fallos en sistemas lineales e invariantes en el tiempo bajo la presencia de perturbaciones gaussianas, a través de observadores basados en modelo de tipo proporcional-integral con ganancias predefinidas. Para ello, se propone un diseño conjunto de los generadores y evaluadores de residuos de fallo teniendo en cuenta el compromiso entre parámetros físicos como la tasa de falsas alarmas, los mínimos fallos detectables, y la integral del cuadrado del error de los residuos ante fallos escalón. También se aborda el problema de aislamiento dinámico de fallos. Para resolver este diseño se presentan dos enfoques distintos: el primero basado en el filtro de Kalman de régimen permanente y el segundo basado en técnicas de optimización convexa.
Granulomatosis with polyangiitis (Wegener’s): a clinical case of overdiagnosis of pulmonary tuberculosis
Authors: Laushkina Zh. A. , Pushkareva E. Yu. , Medvedev S. A. , Filimonov P. N. , Yagubkin P. A.
Published: February 2022

Granulomatosis with polyangiitis (GPA) is a disease characterized by necrotizing granulomatous inflammation of small and medium vessels, mainly in the upper respiratory tract, lungs, and kidneys. Verifying the diagnosis can be difficult due to the variety of clinical presentations, possible multiple organ damage, and atypical course. GPA patients may have nonspecific symptoms characteristic of other bronchopulmonary diseases, which often leads to diagnostic errors. Methods. The article presents an analysis of literature data on the clinical and radiological aspects of lung damage during GPA and clinical observation of a 26-year-old patient who has been under regular follow-up at the TB department for infiltrative tuberculosis without bacterial excretion and received anti-tuberculosis therapy. At the end of the main course of treatment, the patient underwent surgery. Pulmonary tuberculosis was excluded based on histological and bacteriological examinations, but pneumonia with abscesses was diagnosed. Five years after the surgery, infiltrative changes in the operated right lung were detected again during the fluorography. These findings were regarded as tuberculosis. Tuberculosis treatment was carried out with a change in chemotherapy regimens due to the lack of radiological improvement. Results. The patient was referred to the Novosibirsk TB Research Institute. The institute specialists have expressed doubts about the tuberculous etiology because of the long pulmonary disease anamnesis, the previous X-ray findings, and pathological changes in the right lung. These doubts served as the basis to repeat the pathomorphological examination, which led to the diagnosis of granulomatosis with polyangiitis. Conclusion. According to the presented clinical observation, the difficulties of timely verification of the diagnosis have been demonstrated, which is associated with the lack of vigilance among doctors regarding GPA.
Automatic text rubrication using machine learning algorithms
Authors: Челышев Э.А. , Оцоков Ш.А. , Раскатова М.В.
Published: February 2022

Автоматическая рубрикация текстов с использованием алгоритмов машинного обучения. Рассмотрено решение задачи автоматической рубрикации русскоязычных текстов с использованием алгоритмов машинного обучения на примере корпуса новостных статей как задачи классификации на некоторое число непересекающихся классов. Показан алгоритм подготовки текстовых данных для классификации и его практическая реализация на языке программирования Python. Проведен анализ существующих методов нормализации токенов. Представлены результаты проведенного исследования по построению ряда классификаторов для решения задачи классификации русскоязычных текстов. Обобщающая способность классификаторов оценена по ряду метрик.

The article presents the solution of the problem of automatic rubrication of Russian-language texts using machine learning algorithms on the example of a corpus of news articles. This problem is considered as a classification problem for a certain number of disjoint classes. The algorithm of preparing text data for classification and its practical implementation in the Python programming language is presented. The analysis of existing methods of token normalization is carried out. The results of the research on the construction of a number of classifiers for solving the problem of classification of Russian-language texts are presented. The generalizing ability of classifiers is estimated by a number of metrics.
Agglomeration and Congestion in Latin America
Authors: Gómez-Lobo Andrés , Sánchez González Santiago , González Mejia Vileydy , Calatayud Agustina
Published: February 2022

In this paper we explore the possible impact of urban congestion on agglomeration economies for a cross-section set of cities in Latin America. We use travel time data from Tom Tom to estimate wage regressions equations controlling for city size and congestion. We use population in each city in the 19th and early 20th century as instruments for current city size (measures by population). In our baseline estimates, we find an elasticity of wages to city size of 0.05, very similar to previous research in the region. When congestion is included in the estimation, we find that agglomeration economies are reduced. This holds even after using rain-days and average yearly as an instrument for congestion. Our results imply that congestion is a drag on economic productivity. This indirect cost of congestion is considerably larger economically than the direct cost measured as the loss of valuable time for citizens.
Evaluation et Perspectives du Refinancement des Euro-obligations Emises par les Pays d'Afrique Subsaharienne: Le Cas de la République du Cameroun
Authors: Tchuindjo Leonard.
Published: February 2022

A la suite de la pandémie du Covid-19, quelques pays dAfrique subsaharienne ont profité du bas niveau des taux dintért sur les marchés financiers internationaux pour refinancer leurs Euro-obligations, allégeant ainsi les pressions sur leurs finances publiques et évitant des probables cessations de paiement, qui auraient sérieusement endommagé leur réputation. Nous proposons, ici, une méthodologie de quantifications des cots financiers liés à ces refinancements, et ainsi que des suggestions qui aideront ces pays, ainsi que ceux dAmérique Latine, à réduire ces cots. Comme exemple illustratif, nous présentons le cas du refinancement, en juin 2021, de lobligation Eurodollar émise par la République du Cameroun en novembre 2015.
Estimación espaciotemporal de la recarga potencial en un sistema pseudokárstico tropical
Authors: Patiño-Rojas Sandra M. , Jaramillo Marcela
Published: February 2022

La estimación de la recarga permite determinar la incidencia de los cambios climáticos en la oferta hídrica y definir las tasas de bombeo adecuadas para que no ocurra sobreexplotación en los acuíferos. En este sentido, se hizo la primera estimación espaciotemporal de la recarga potencial por precipitación en la Dunita de Medellín, un sistema pseudokárstico tropical considerado zona de recarga lejana de los acuíferos aluviales del Valle de Aburrá (Colombia). Actualmente, estos acuíferos son explotados para uso industrial, pero debido al acelerado crecimiento poblacional podrían ser una fuente para el consumo humano en un futuro. Se emplearon dos métodos de balance hídrico, el balance hídrico superficial (surface water balance, SWB) a escala diaria y el de Schosinsky a escala mensual. Además, se evaluaron tres escenarios climáticos diferentes: año seco-El Niño, año húmedo-La Niña y año normal. Se encontró que la recarga se veía fuertemente  influenciada por la precipitación y por la textura del suelo. Así, los valores promedios máximos se reportaron para La Niña (1.597 mm/año) y los mínimos para El Niño (813,5 mm/año). Se encontró, además, que el método de Schosinsky subestimó la recarga en un 20 % debido a que esta es un proceso que se da a escala de eventos que solo pueden apreciarse en los registros diarios de precipitación.  A pesar de las diferencias, los resultados evidenciaron no solo el potencial de la Dunita de Medellín como zona de recarga de los acuíferos aluviales, sino también la marcada dependencia de la recarga frente a los fenómenos climáticos como el ENOS.
Métodos de obtención y aplicación de nanopartículas magnéticas en el tratamiento y diagnóstico del cáncer: una revisión
Authors: Lozano Ocaña Yosselyn , Tubón-Usca Irvin , Vaca-Altamirano Gabriela , Tubón-Usca Gabriela
Published: February 2022

El cáncer es una enfermedad heterogénea con múltiples mecanismos de evasión de la respuesta inmunitaria, de resistencia, proliferación y supervivencia, cuya tasa de mortalidad, según la Organización Mundial de la Salud (OMS), ha aumentado debido a los malos hábitos de la población (tabaco, alcohol, drogas, entre otros), por lo que, sumado a sistemas de salud deficientes e ineficientes, especialmente en los países con ingresos bajos y medios, se ha convertido en la segunda causa de muerte a nivel mundial. La nanomedicina ha permitido la investigación y desarrollo de nuevos sistemas terapéuticos con nanopartículas magnéticas. El objetivo de esta revisión bibliográfica es reportar los principales métodos de obtención de nanopartículas magnéticas y discutir brevemente su funcionalización y aplicación en el campo de la oncología, mediante una búsqueda bibliográfica en las bases de datos científicas con artículos de alto impacto y con mayor número de citaciones. Utilizando criterios de inclusión y exclusión, se establecieron indicadores específicos de las nanopartículas magnéticas y las aplicaciones biomédicas. Los resultados evidenciaron que las nanopartículas más empleadas son las de óxido de hierro superparamagnéticas (superparamagnetic iron oxide nanoparticles, SPION) debido a su multifuncionalidad y sus excelentes propiedades físicoquímicas y biológicas. Además, poseen una alta citotoxicidad en células cancerígenas, produciendo así un alto porcentaje de muerte celular. Por último, los tratamientos alternativos, como la hipertermia magnética, la terapia genética y la administración de fármacos, reducen los efectos secundarios con respecto a los tratamientos convencionales, y por lo que son prometedores. Asimismo, los agentes de contraste utilizados en resonancia magnética mejoran el diagnóstico.
Presencia confirmada del murciélago marrón de Chiriquí, Eptesicus chiriquinus (Chiroptera: Vespertilionidae), en el departamento de Chocó, Colombia
Authors: Palacios-Mayoral Victor Danilo , Palacios-Mosquera Leison , Echavarría-Rentería Jonard David , Jimenez-Ortega Alex Mauricio , Mantilla-Meluk Hugo
Published: February 2022

Eptesicus es un género de murciélagos de la familia Vespertilionidae con amplia distribución mundial.En Colombia se conocen seis especies, de las cuales E. chiriquinus es una de las más ampliamente distribuidas con presencia en 13 departamentos. Se confirma aquí la presencia de E. chiriquinus en el departamento del Chocó mediante la verificación de un espécimen CMCH 1285 ♂ recolectado en el corregimiento de Pacurita, municipio de Quibdó, y depositado en la Colección Teriológica del Chocó. Se comenta sobre la diferenciación entre especies de Eptesicus presentes en el Chocó a partir de sus caracteres externos y, por último, se presenta un mapa actualizado de su distribución en el país.