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AI-based strategies for handover enhancement in visible light communication systems
No full textThe Internet of Things (IoT) growth, particularly applications involving wireless devices, has significantly increased the demand for signal bandwidth. However, Radio Frequency (RF) wire less systems presented a limited spectrum to support massive device connections and suscepti bility to electromagnetic interference. These challenges have increased the interest in exploring alternative solutions to face RF issues while maintaining high data rates, low latency, reliability, and cost efficiency. Advancements in Light Emitting Diode (LED) technology have introduced highly energy-efficient lighting capable of high-speed modulation of light intensity. Thus, these characteristics have driven research into Visible Light Communication (VLC), which can uti lize existing lighting infrastructures for data transmission using a broad and unregulated optical spectrum (≈ 400 THz). Additionally, VLC can also provide physical layer security, low power consumption, high transmission speeds, and immunity to RF electromagnetic interference. Spectral efficiency and high data rates are critical for VLC systems, with Orthogonal Fre quency Division Multiplexing (OFDM) emerging as a robust and spectrally efficient modulation technique for indoor applications. However, nonlinearities introduced by multicarrier signals in LED-based systems can degrade performance. To address these issues, techniques such as Constant-Envelope OFDM (CE-OFDM) have been developed to mitigate Peak-to-Average Power Ratio (PAPR), improving power efficiency and reducing distortions, particularly in high power transmission scenarios. Additionally, VLC faces several challenges, including signal blockage by opaque objects, confinement of signals, and limited Access Point (AP) coverage. Addressing these limitations often requires deploying ultra-dense networks to ensure reliable connectivity across large areas. However, such dense deployments can lead to frequent han dovers, increasing infrastructure costs and complexity. This thesis evaluates the application of larger signal amplitudes despite the LED-nonlinearities to enable data transmission over long distances, evaluating the conventional and constant envelope OFDMperformances. Furthermore, it proposes a ModifiedGeneticAlgorithm(MGA) optimization procedure combined with time series Machine Learning (ML) classifiers to min imize handovers in both a digital twin-based simulation system and experimental VLC setups. The proposed handover scheme considers receiver trajectory information to reduce handover frequency while maintaining system performance within the forward error correction limit. Results demonstrate that a 9.51 Mb/s CE-OFDM system with 16-QAM subcarrier map ping in a 5MHz bandwidth outperformed a conventional OFDM system in terms of efficiency. The application of the CE-OFDM scheme in a 6m VLC link reduced the EVM from 17.5%to 10%, an improvement of approximately 43%. Additionally, the CE-OFDM-based VLC system demonstrated satisfactory performance in an 8 m link when using 4-QAM subcarrier mapping. The proposed handover scheme outperforms a power-based approach, achieving han dover reductions of 42.47% in a MISO simulation environment and up to 48.61% in a MIMO environment. In experimental scenarios with three and four transmitters, the scheme achieved reductions of 46.43% and 45.45%, respectively. These results confirm that the integration of MGAwithMLmodelseffectively minimizes handovers and improves overall VLC system per formanceresumoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
Nutrientes e carbono em Khaya
No full textThis study aimed to evaluate the stem of Khaya grandifoliola, Khaya senegalensis, and Khaya ivorensis at 8 years and 7 months of age and to determine whether these species differ in their biomass, nutrient, carbon, and nutrient use efficiency (NUE) stocks. The study site is located in the Vale Natural Reserve, in the municipality of Linhares, Espírito Santo, Brazil (19°09′01.2″ S and 40°04′48.7″ W). A preliminary census was carried out, from which five trees of average diameter were selected for felling. From each tree, three 5 cm discs were removed at the base, middle, and top of the trunk. Two opposing wedges were then taken from each disc to represent heartwood and sapwood proportionally, and these wedges were separated into stembark and stemwood compartments. The samples were oven-dried to a constant weight, ground, and taken to the laboratory for determination of carbon, macro, and micronutrient contents on for each tree. Stemwood and stembark biomass were estimated based on the census of the same stand. Using the nutrient content and biomass data from the felled trees, a principal component analysis (PCA) was performed, considering statistical significance, collinearity, and coefficient of variation (CV). Nutrient and carbon stocks were calculated as the product of average nutrient content and census-based biomass. For the calculation of NUE, the ratio between nutrient content for each tree and its respective biomass was used. The contents, biomass, stocks, and NUE were subjected to analysis of variance and Tukey’s test (p N > K > Mg > S > P, whereas the stemwood nutrient order varied according to species. The biomass of K. senegalensis had the highest proportion of stembark (24.13%) relative to stemwood. In contrast, K. ivorensis showed the lowest stembark biomass but the highest stemwood biomass, not differing statistically from K. grandifoliola. The stemwood biomass of K. senegalensis was about 13% lower than that of the other species. The PCA indicated clustering among the Khaya species, explaining 83% of the total variance in three principal components (PC1 = 36.1%; PC2 = 26.4%; PC3 = 20.5%). K. senegalensis exhibited high stembark stocks of N (68.83 kg ha-1), P (4.33 kg ha-1), and K (53.37 kg ha-1) and high stemwood stocks of N (72.66 kg ha-1), Mg (12.91 kg ha-1), and P (10.66 kg ha-1), in addition to the highest carbon accumulation in stembark (3.07 Mg ha-1). K. ivorensis had the highest stemwood stocks of K (77.75 kg ha-1) and Fe (360.98 g ha-1), yet the lowest stocks of N and Ca. K. grandifoliola presented the highest stemwood stock of Ca and intermediate values for the other nutrients. Stemwood carbon stock did not differ among the species, with an average of 11.77 Mg ha-1. NUE in the stembark did not differ among species. In the stemwood, K. ivorensis demonstrated greater efficiency in the use of N, Ca, Mg, and Cu, but lower efficiency for Fe; K. grandifoliola was more efficient in the use of Zn, Mn, and K; and K. senegalensis stood out only in the NUE of Fe, showing low efficiency for N, Mg, and Mn.Objetivou-se avaliar o fuste das espécies Khaya grandifoliola, Khaya senegalensis e Khaya ivorensis, aos 8 anos e 7 meses e verificar se diferem em relação aos estoques de biomassa, nutrientes, carbono e EUN das espécies. A área de plantio estudada encontra-se na Reserva Natural Vale, localizada no município de Linhares, Espírito Santo (19°09′01,2″ S e 40°04′48,7″ O). Foi realizado o censo, a partir do qual foram selecionadas cinco árvores de cada espécie de diâmetro médio para abate. A partir dessas árvores foram retirados três discos de 5,0 cm, nas posições: base, meio e topo, sendo retiradas duas cunhas opostas de cada disco para representar proporcionalmente o cerne e o alburno, sendo compartimentadas em casca e madeira. As amostras foram secas em estufa até atingirem peso constante, trituradas e levadas ao laboratório para determinar os teores médios de carbono, macro e micronutrientes por árvore. Foram estimadas as biomassas da madeira e da casca com base no censo. Com os dados de teores e biomassa das árvores abatidas se procedeu com a análise de componentes principais (PCA), considerando a significância estatística, colinearidade e coeficiente de variação (CV). Os estoques de nutrientes e carbono foram calculados como o produto do teor médio pela biomassa. Para o cálculo da eficiência de utilização de nutrientes (EUN) foi utilizada a razão entre os teores por árvore e a biomassa por árvore. Os teores, biomassa, estoques e EUN foram submetidos à análise de variância e o teste de Tukey (p N > K > Mg > S > P, na madeira a ordem variou de acordo com a espécie. A biomassa de K. senegalensis apresentou a maior proporção de casca em relação à madeira (24,13%). Já K. ivorensis teve a menor biomassa de casca e, junto com K. grandifoliola, as maiores biomassas de madeira. A biomassa da madeira em K. senegalensis foi aproximadamente 13% inferior à observada nas demais espécies. A PCA evidenciou agrupamento entre as espécies de Khaya, explicando 83% da variância total em três componentes principais (PC1 = 36,1%; PC2= 26,4%; PC3 = 20,5%). K. senegalensis apresentou elevados estoques de N (68,83 Kg ha-1), P (4,33 Kg ha-1) e K (53,37 Kg ha-1) na casca e de N (72,66 Kg ha-1), Mg (12,91 Kg ha-1) e P (10,66 Kg ha-1) na madeira, além do maior acúmulo de carbono na casca (3,07 Mg ha-1). K. ivorensis destacou-se pelo maior estoque de K (77,75 Kg ha-1) e Fe (360,98 g ha-1) na madeira, mas teve os menores estoques de N e Ca. K. grandifoliola apresentou o maior estoque de Ca na madeira e valores intermediários para os demais nutrientes. O estoque de carbono na madeira não diferiu entre as espécies, com média de 11,77 Mg ha-1. A EUN na casca não diferiu entre as espécies. Na madeira, K. ivorensis apresentou maior eficiência no uso de N, Ca, Mg e Cu, mas menor para Fe; K. grandifoliola foi mais eficiente no uso de Zn, Mn e K; K. senegalensis destacou-se apenas na EUN de Fe, apresentando baixa eficiência para N, Mg e Mn.Fundação de Amparo à Pesquisa e Inovação do Espírito Santo (FAPES
A poesia feminista de Leila Míccolis: crítica e resistência à violência patriarcal
No full textThis thesis analyzes the critique of and resistance to patriarchal violence in the poetry of Leila Míccolis from 1965 to 2013. Adopting a feminist and interdisciplinary approach, it investigates how her poetic work operates as a form of denunciation and confrontation of gender-based structures of domination, particularly within affective and familial relationships. The corpus comprises poems from the following books: Gaveta da Solidão (1965); Impróprio para menores de 18 amores (1976), co-authored with Franklin Jorge; Respeitável Público (1980); Mercado de escravas (1984), with Glória Perez; Só se for a dois (1990), with Urhacy Faustino; De 4 (1990), with Glória Perez, Marçal Aquino, and Ona Gaia; Sangue cenográfico (1965–1997); Literatura Século XXI (1998); and Desfamiliares (2013). All of these works are included in the anthology Desfamiliares: poesia completa de Leila Míccolis (1965–2012), published in 2013. These texts are examined through the lens of literary and socio-philosophical theories by authors such as Theodor Adorno, Pierre Bourdieu, Judith Butler, Silvia Federici, bell hooks, and Rita Segato, proposing a critical reading of poetic discourse as both representation of and resistance to the symbolic and material forms of patriarchal violence. From this perspective, the study highlights Míccolis’s contribution to the construction of Brazilian feminist poetry—still marginalized within canonical literary criticism. While she is known for her involvement in the marginal poetry movement of the 1970s and for employing eroticism as a form of protest, her incisive critique of patriarchy and authoritarian affective dynamics remains underexplored. This research seeks to fill that gap by foregrounding the political and transgressive dimensions of her poetry, which disrupts normative models of subjectivity and opens a space for reflection on the manifold forms of violence that permeate women's everyday lives. In times of social and political regression, her voice endures as both urgent and necessary. The thesis concludes that, for its critical force, acerbic humor, and thematic depth, Leila Míccolis’s oeuvre constitutes a landmark in Brazilian feminist literature and warrants broader critical recognition.Esta tese analisa a crítica e resistência à violência patriarcal na poesia de Leila Míccolis entre 1965 e 2013. Adotando uma abordagem feminista e interdisciplinar, investiga-se como sua poética opera como forma de denúncia e enfrentamento das estruturas de dominação de gênero, especialmente nas relações afetivas e familiares. O corpus compreende poemas dos livros Gaveta da Solidão (1965); Impróprio para menores de 18 amores (1976), escrito com Franklin Jorge; Respeitável Público (1980); Mercado de escravas (1984), escrito com Glória Perez; Só se for a dois (1990), escrito com Urhacy Faustino; De 4 (1990), escrito com Glória Perez, Marçal Aquino e Ona Gaia; Sangue cenográfico (1965-1997); Literatura Século XXI (1998) e Desfamiliares (2013), todos incluídos na coletânea Desfamiliares: poesia completa de Leila Míccolis (1965–2012), publicada em 2013. Essas obras são examinadas à luz de teorias literárias e sociofilosóficas de autoras e autores como Theodor Adorno, Pierre Bourdieu, Judith Butler, Silvia Federici, bell hooks e Rita Segato, propondo-se uma leitura crítica do conteúdo poético como representação e resistência às formas simbólicas e materiais da violência patriarcal. Nessa perspectiva, evidencia-se a contribuição de Míccolis à construção de uma poesia feminista brasileira, ainda marginalizada nos estudos literários canônicos. Embora reconhecida por sua atuação na poesia marginal dos anos 1970 e pelo uso do erotismo como forma de protesto, sua crítica ao patriarcado e às relações afetivas autoritárias permanece subexplorada. O trabalho busca preencher essa lacuna, valorizando a dimensão política e transgressora de sua poesia, que rompe com os modelos normativos de subjetividade e oferece um espaço de reflexão sobre as múltiplas formas de violência que atravessam o cotidiano das mulheres; em tempos de retrocessos sociais e políticos, sua voz permanece urgente e necessária. Conclui-se que, por sua força crítica, humor ácido e profundidade temática, a obra de Leila Míccolis constitui um marco da literatura feminista brasileira e merece maior reconhecimento crítico.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
Resolução Normativa CGD/UFES nº 05
No full textEstabelece a Política de Uso do Serviço de Telefonia sobre IP (VoIP) no âmbito da Universidade Federal do Espírito Santo
DECISÃO AD REFERENDUM - 23068.016815/2024-15
No full textCriação do Curso de Pós-graduação lato sensu Especialização em Tradução e Interpretação em Língua de Sinais Brasileira-Língua Portuguesa no contexto educaciona
Sintomas depressivos em indivíduos transgêneros e cisgêneros : um estudo comparativo sobre os fatores associados
No full textTransgender individuals have some level of gender incongruence, which in turn is characterized by psychological discomfort caused by the discrepancy between their gender identity, sex assigned at birth, and/or physical appearance. Transgender identity is commonly associated with social stigma, structural vulnerabilities, and increased chances of developing depressive symptoms. In this sense, this study aimed to analyze the factors associated with depressive symptoms in transgender individuals and compare them with those observed in cisgender individuals living in the state of Espírito SantoPessoas transgênero possuem algum nível de incongruência de gênero, que por sua vez é caracterizada pelo desconforto psicológico causado pela discrepância entre sua identidade de gênero, sexo designado ao nascimento e/ou aparência física. A identidade transgênero comumente está associada ao estigma social, a vulnerabilidades estruturais e maiores chances de desenvolvimento de sintomas depressivos. Nesse sentido, este estudo teve como objetivo analisar os fatores associados aos sintomas depressivos em indivíduos transgênero e compará-los com aqueles observados em indivíduos cisgênero residentes no estado do Espírito SantoCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
Habitat use patterns and population connectivity of the dog snapper Lutjanus jocu in tropical environments of the Southwestern Atlantic and complementary ecological studies
No full textAlthough the dog snapper (Lutjanus jocu), plays a major ecological and economic role in coastal and marine systems, the populations are currently facing overfishing in the Abrolhos Bank, SW Atlantic. Therefore, the following three specific goals were established: (i) to assess the habitat use along the ontogeny of juveniles in a tropical estuary, (ii) to assess the effects of water chemistry variability on otolith elemental signatures of juveniles within a dynamic estuarine nursery habitat, and (iii) to assess the contribution of distinct nursery habitats (NHs) to the exploited individuals found in adult grounds (AGs). Briefly, in the first chapter, stable isotope analysis of 57 juveniles revealed a major dependency on sheltered estuarine habitats (75.9 ± 5.5%), represented by mangroves. However, the contribution of marine habitats to their isotopic composition decreased considerably as TL increased (from 26.8% to 6.2%), suggesting their recent ingression into the estuarine NH. The second chapter assessed the otolith elemental signatures and water chemistry of a range of elements (Mg, Mn, Cu, Zn, Sr, and Ba) relative to calcium along a salinity gradient and monthly for a year, covering distinct seasons. Using generalized linear mixed models (GLMMs), we found that water chemistry alone does not fully explain the otolith signatures, suggesting that additional factors play a role depending on the element. The environmental signals driving otolith signatures varied by element, with Ba:Ca showing the narrowest temporal window of influence. The third chapter assessed the connectivity among juvenile (n = 98) and adult (n = 69) dog snappers across three NHs and two AGs along over 400 km of a tropical coastline. Otolith multi-elemental signatures, analyzed using a Random Forest model, revealed that 84.0% of exploited stock from southward upwelling AGs originated from estuarine environments, highlighting mangrove dependency. In contrast, stock from northward warm-waters AGs displayed a higher diversity in In contrast, stock from northward warm-waters AGs displayed a higher diversity in nursery origins, with most individuals coming from the sea environment (75.0%), consisting of biogenic coral and rocky reefs. Our findings provide new insights into the understanding of the dog snapper’s biology and ecology, which may support decision-making and conservation efforts. Besides that, I present four complementary studies related to marine ecological studies conducted during my doctorateNão disponívelCoordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)Fundação de Amparo à Pesquisa e Inovação do Espírito Santo (Fapes
Histórias de vida e formação : o desenvolvimento profissional de formadores de professores na interface com os programas PIBID e PRP na UFES
No full textBased on an epistemic-methodological perspective of biographical research in education, conducted through life stories, this thesis investigated the life trajectories and professional preparation of Natural Sciences teacher educators (undergraduate degrees in Biological Sciences, Physics, and Chemistry) involved in the PIBID and PRP programs at UFES, seeking to understand the meanings attributed to these experiences in relation to their professional development. To achieve this goal, three specific objectives guided the study: i) to (re)tell and interpret the life trajectories and formation of teacher educators, valuing their experiences and examining the construction of their teaching identities throughout this process; ii) to understand the conceptions of teacher education sustained in their work in higher education, as well as in their interface with the PIBID and PRP programs; and iii) to analyze the implications of the experiences in the PIBID and PRP programs for their professional development. The study was conducted through individual biographical interviews with three teacher educators – identified as Vicente, Maria, and Isaque – whose narratives were analyzed using biograms, critical incidents, and a narrative analysis of their life stories, grounded in Ricoeur’s hermeneutics. Thus, the study sought to understand how formative experiences were re-appropriated across their life paths and within the context of their participation in the programs.The (re)telling of these stories revealed that experiences from primary school onward contributed to the construction of the educators’ personal identities as “good students” and, later, their professional identities as “teacher educators.” Through their engagement in higher education, the teacher-narrators developed critical and reflective understandings of the teacher education process in undergraduate programs – conceived as comprehensive training that integrates conceptual, pedagogical, and human dimensions – as well as of their own formation and their role as teacher educators within the programs. The experiences in the PIBID and PRP programs were conceived as processes of self-formation or biographical learning, articulating formal and informal dimensions with social, cultural, and historical contexts. Each trajectory proved unique, but all indicated that professional development extends beyond the institutional sphere, configuring itself also as a personal and situated process. Finally, the narratives of Vicente, Maria, and Isaque highlight not only individual journeys but also represent the emergence of a new generation of higher education teacher educators in Brazil. We conclude that the pedagogical preparation of teacher educators working in teaching and education is a sine qua non condition for consolidating university teaching practices aimed at the training of future Natural Sciences teachers in undergraduate programsA tese, com base em uma perspectiva epistêmico-metodológica da investigação biográfica em educação e realizada por meio das histórias de vida, buscou investigar as trajetórias de vida e formação dos formadores de professores de Ciências da Natureza (Licenciatura em Ciências Biológicas, Física e Química) envolvidos nos programas PIBID e PRP da UFES, buscando compreender os significados atribuídos a essas experiências em relação ao seu desenvolvimento profissional. Para alcançar tal objetivo, outros específicos nortearam o estudo: i) (Re)contar e interpretar as trajetórias de vida e formação dos formadores de professores valorizando as experiências e compreendendo a construção de suas identidades docentes ao longo desse processo; ii) Compreender as concepções de formação docente que esses formadores sustentam em sua atuação na docência superior, bem como na interface com os programas PIBID e PRP; iii) Analisar as implicações das experiências vivenciadas nos programas PIBID e PRP para o desenvolvimento profissional. O estudo foi realizado por meio de entrevistas biográficas individuais com três formadores de professores – identificados como Vicente, Maria e Isaque –, cujas narrativas foram analisadas a partir de biogramas, incidentes críticos e de uma análise narrativa das histórias de vida, fundamentada na hermenêutica ricoeuriana. Assim, buscou-se compreender a reapropriação das experiências formativas ao longo de seus percursos de vida e no contexto de atuação nos programas. A (re)contação dessas histórias evidenciou que experiências desde a escolaridade básica contribuíram para a construção de identidades pessoais dos formadores como “bons alunos” e, posteriormente, das identidades profissionais como “formadores de professores”. Em articulação com a docência superior, os professores narradores elaboraram concepções críticas e reflexivas de docência sobre o processo formativo nos cursos de licenciatura, concebido como formação integral, que articula dimensões conceituais, pedagógicas e humanas, bem como sobre a própria formação e papel dos formadores de professores nos programas. As experiências e aprendizagens nos programas PIBID e PRP foram compreendidas como processos de autoformação ou de aprendizagem biográfica, articulando dimensões formais e informais com os contextos sociais, culturais e históricos. Cada trajetória revelou-se singular, mas todas apontaram que o desenvolvimento profissional vai além do institucional, configurando-se também como um processo pessoal e situado. Por fim, as narrativas de Vicente, Maria e Isaque evidenciam não apenas percursos individuais, mas representam a constituição de uma nova geração de docentes no ensino superior no Brasil. Concluímos que a formação pedagógica dos formadores de professores vinculados à área de ensino e educação é condição sine qua non para consolidar uma didática universitária voltada à formação de futuros professores da área de Ciências da Natureza nos cursos de licenciatura.Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES
DECISÃO N° 29/2025
No full textO CONSELHO DE ENSINO, PESQUISA E EXTENSÃO DA UNIVERSIDADE FEDERAL DO ESPÍRITO SANTO, NO USO DE SUAS ATRIBUIÇÕES LEGAIS E ESTATUTÁRIAS, NA SESSÃO ORDINÁRIA DO DIA NOVE DE MAIODE DOIS MIL E VINTE E CINCO,E TENDO EM VISTA O QUE ESTABELECE O ARTIGO 8º DA RESOLUÇÃO Nº 41, 25 DE SETEMBRO DE 2014,DO CONSELHO UNIVERSITÁRIO, DECIDIU, POR UNANIMIDADE, INDICAR O NOME DO CONSELHEIRO LEONARDO DE RESENDE DUTRA, COMO REPRESENTANTE TITULAR INDICADO POR ESTE CONSELHO, PARA INTEGRAR A COMISSÃO GESTORA DO INCUBAUFES,TUDO CONFORME CONSTA DO DOCUMENTO AVULSO Nº 23068.019044/2025-9