The article's authors have provided a detailed problem description of identifying and correcting errors in Ukrainian-language texts. This paper provides a detailed analysis of the latest research and publications aimed at solving the problems of identifying and correcting errors in Ukrainian-language texts. The analysis of modern tools related to error correction in texts is presented along with a comparative description. Investigated the existing data corpora for the Ukrainian language so that they are relevant to solving GEC tasks. Discovered the need to create a large annotated data corpus, which will be prepared by a special team with linguistic expertise. Analysed the opportunities, advantages and disadvantages of modern machine learning models that interpret the task of detecting and correcting errors in texts as classification or machine translation. Introduced the need to develop a machine-learning algorithm that will take into account the specifics of morphologically complex languages, such as Ukrainian. Demonstrated the work of the modern models and provided screenshots. Revealed the need for further research in the Ukrainian segment of machine learning to solve the problems of correcting errors in texts using various methods and approaches.
{"title":"Current Trends in the Use of Machine Learning for Error Correction in Ukrainian Texts","authors":"Ростислав Федчук, Victoria Vysotska","doi":"10.32388/n4vgbj","DOIUrl":"https://doi.org/10.32388/n4vgbj","url":null,"abstract":"The article's authors have provided a detailed problem description of identifying and correcting errors in Ukrainian-language texts. This paper provides a detailed analysis of the latest research and publications aimed at solving the problems of identifying and correcting errors in Ukrainian-language texts. The analysis of modern tools related to error correction in texts is presented along with a comparative description. Investigated the existing data corpora for the Ukrainian language so that they are relevant to solving GEC tasks. Discovered the need to create a large annotated data corpus, which will be prepared by a special team with linguistic expertise. Analysed the opportunities, advantages and disadvantages of modern machine learning models that interpret the task of detecting and correcting errors in texts as classification or machine translation. Introduced the need to develop a machine-learning algorithm that will take into account the specifics of morphologically complex languages, such as Ukrainian. Demonstrated the work of the modern models and provided screenshots. Revealed the need for further research in the Ukrainian segment of machine learning to solve the problems of correcting errors in texts using various methods and approaches.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"79 3","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140984465","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Hepatitis E virus (HEV) is the leading cause of acute viral hepatitis worldwide, recognized as a significant global public health concern. Recent advancements in understanding the natural history of HEV infection have shed light on its epidemiology and clinical implications. The primary mode of HEV transmission is fecal-oral, occurring through contaminated water or food. Parenteral transmission, particularly through blood transfusions, was initially overlooked but has been increasingly recognized in both developing and industrialized countries. Acute HEV infection typically manifests as self-limiting jaundice, particularly in immunocompetent individuals. However, recent data suggest that acute infection can progress to a chronic form in various immunosuppressive conditions, including solid organ transplantation, hematological malignancies, and human immunodeficiency virus (HIV) infection. Chronic HEV can lead to cirrhosis, which may progress rapidly in some cases. Extrahepatic manifestations, particularly neurological complications, have also been reported. HEV remains underdiagnosed globally due to a lack of awareness among healthcare providers in many regions. Advances in serological and molecular assays have facilitated reliable diagnosis, both in immunocompetent and immunocompromised patients. Ribavirin monotherapy has proven effective in treating chronic HEV infection in immunosuppressed individuals and is currently widely recommended. However, its efficacy in acute HEV remains inconclusive. In 2011, an effective and well-tolerated HEV vaccine was developed and approved in China. This vaccine holds promise for high-risk populations, particularly individuals with cirrhosis and travelers to endemic regions.
戊型肝炎病毒（HEV）是全球急性病毒性肝炎的主要病因，是全球公认的重大公共卫生问题。最近，人们对戊型肝炎病毒感染自然史的了解取得了进展，从而揭示了其流行病学和临床影响。HEV 的主要传播方式是粪口传播，通过受污染的水或食物传播。肠道传播，尤其是通过输血传播，起初被忽视，但在发展中国家和工业化国家已被越来越多地认识到。急性 HEV 感染通常表现为自限性黄疸，尤其是在免疫力低下的人群中。然而，最近的数据表明，在各种免疫抑制条件下，包括实体器官移植、血液恶性肿瘤和人类免疫缺陷病毒（HIV）感染，急性感染可发展为慢性形式。慢性 HEV 可导致肝硬化，在某些病例中可能进展迅速。肝外表现，尤其是神经系统并发症也有报道。由于许多地区的医疗保健提供者对 HEV 缺乏认识，因此全球范围内 HEV 的诊断率仍然偏低。血清学和分子检测技术的进步为免疫功能健全和免疫功能低下患者的可靠诊断提供了便利。利巴韦林单药疗法已被证明可有效治疗免疫抑制患者的慢性 HEV 感染，目前被广泛推荐使用。然而，它对急性 HEV 的疗效仍无定论。2011 年，中国开发并批准了一种有效且耐受性良好的 HEV 疫苗。这种疫苗有望用于高危人群，尤其是肝硬化患者和前往流行地区的旅行者。
{"title":"[Mini Review] Global Burden and Evolving Understanding of Hepatitis E Virus","authors":"H. Boukhrissa, S. Mechakra, A. Lacheheb","doi":"10.32388/thhyzy","DOIUrl":"https://doi.org/10.32388/thhyzy","url":null,"abstract":"Hepatitis E virus (HEV) is the leading cause of acute viral hepatitis worldwide, recognized as a significant global public health concern. Recent advancements in understanding the natural history of HEV infection have shed light on its epidemiology and clinical implications. The primary mode of HEV transmission is fecal-oral, occurring through contaminated water or food. Parenteral transmission, particularly through blood transfusions, was initially overlooked but has been increasingly recognized in both developing and industrialized countries. Acute HEV infection typically manifests as self-limiting jaundice, particularly in immunocompetent individuals. However, recent data suggest that acute infection can progress to a chronic form in various immunosuppressive conditions, including solid organ transplantation, hematological malignancies, and human immunodeficiency virus (HIV) infection. Chronic HEV can lead to cirrhosis, which may progress rapidly in some cases. Extrahepatic manifestations, particularly neurological complications, have also been reported. HEV remains underdiagnosed globally due to a lack of awareness among healthcare providers in many regions. Advances in serological and molecular assays have facilitated reliable diagnosis, both in immunocompetent and immunocompromised patients. Ribavirin monotherapy has proven effective in treating chronic HEV infection in immunosuppressed individuals and is currently widely recommended. However, its efficacy in acute HEV remains inconclusive. In 2011, an effective and well-tolerated HEV vaccine was developed and approved in China. This vaccine holds promise for high-risk populations, particularly individuals with cirrhosis and travelers to endemic regions.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"105 48","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140985877","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Review of: \"Review of: Estimates of Atlantic Goliath Grouper (Epinephelus Itajara) Bycatch Mortality in Commercial Fisheries of the Southeastern Us From 2002 to 2022\"","authors":"EdwardJK Patterson","doi":"10.32388/pspnfg","DOIUrl":"https://doi.org/10.32388/pspnfg","url":null,"abstract":"<jats:p/>","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"118 23","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140985628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
V. H. Panhóca, Carolina Alvarez, Viviane Brocca de Souza, Simone Aparecida Ferreira, Marcela Sene-Fiorese, V. Bagnato
INTRODUCTION: This study aimed to evaluate and raise the therapeutic hypothesis of the use Photobiomodulation (PBMT) as a complementary therapy in patients with sleep disorder (SD) in a broad approach involving other pathologies superimposed on this pathology. METHODS: This is a clinical case report of a patient with Parkinson's disease (PD) complaining of sleep disorder. The proposed treatment is the use of photobiomodulation (PBMT) with intraoral application using an innovative dosimetry. SD was assessed using an adapted analogue scale. RESULTS: In the evaluation performed after the last session, there was an improvement in the sleep disorder compared to the pre-treatment evaluation. However, one month after the end of the treatment, it was observed that the quality of sleep remained practically the same. CONCLUSION: The results of the present study suggest that photobiomodulation could become a new therapeutic perspective for the treatment of sleep disorders (SD). However, controlled, and randomized clinical studies must be carried out to strengthen and confirm the evidence observed in this case report.
{"title":"[Case Study] Photobiomodulation (PBMT) and Its Interface with Sleep Dentistry: Clinical Case Report","authors":"V. H. Panhóca, Carolina Alvarez, Viviane Brocca de Souza, Simone Aparecida Ferreira, Marcela Sene-Fiorese, V. Bagnato","doi":"10.32388/s6f5jd.3","DOIUrl":"https://doi.org/10.32388/s6f5jd.3","url":null,"abstract":"INTRODUCTION: This study aimed to evaluate and raise the therapeutic hypothesis of the use Photobiomodulation (PBMT) as a complementary therapy in patients with sleep disorder (SD) in a broad approach involving other pathologies superimposed on this pathology.\u0000\u0000METHODS: This is a clinical case report of a patient with Parkinson's disease (PD) complaining of sleep disorder. The proposed treatment is the use of photobiomodulation (PBMT) with intraoral application using an innovative dosimetry. SD was assessed using an adapted analogue scale.\u0000\u0000RESULTS: In the evaluation performed after the last session, there was an improvement in the sleep disorder compared to the pre-treatment evaluation. However, one month after the end of the treatment, it was observed that the quality of sleep remained practically the same.\u0000\u0000CONCLUSION: The results of the present study suggest that photobiomodulation could become a new therapeutic perspective for the treatment of sleep disorders (SD). However, controlled, and randomized clinical studies must be carried out to strengthen and confirm the evidence observed in this case report.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"47 24","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140983974","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The prevailing global social and geopolitical situation is perceived as unfavorable by most people. According to the authors, many worrying threats are linked to the mental state of the planet's inhabitants. Thus, they believe that the emergence of authoritarian regimes, the constant instigation of wars, and the poor living conditions in many communities require explanations grounded in accurate psychological concepts. The authors refer to their previous work that connects authoritarian regimes with conservative personality traits, particularly those found in far-right, populist groups. These regimes often promote a patriarchal social structure and rely on religious taboos to maintain control. The authors expand on this theory by exploring Sigmund Freud's concepts of "totem" and "taboo," examining how these ideas might explain the behavior of authoritarian regimes. They also refer to Carl Jung's theory of the Shadow and the collective sense of inferiority. The article concludes with suggestions on how to counter the spread of authoritarian regimes. The authors advocate for a balanced approach that focuses on finding ways to coexist with authoritarian individuals. They draw parallels between the different neurophysiological functions of the brain's two hemispheres and the potential coexistence of multiple geopolitical blocs. The authors reflect on a country that recently shifted from far-right, populist, national governance back to a liberal democratic pattern. They also propose a tool to record personal civic feelings, which can help assess whether a particular region is moving toward or away from autocratic governance.
{"title":"Should the Struggle Against Authoritarian Regimes Be Based on Aristotle’s or Freud’s Psychology, or Rather on Neuroscience?","authors":"Andrzej Brodziak, Danuta Abram","doi":"10.32388/dinx3f","DOIUrl":"https://doi.org/10.32388/dinx3f","url":null,"abstract":"The prevailing global social and geopolitical situation is perceived as unfavorable by most people. According to the authors, many worrying threats are linked to the mental state of the planet's inhabitants. Thus, they believe that the emergence of authoritarian regimes, the constant instigation of wars, and the poor living conditions in many communities require explanations grounded in accurate psychological concepts.\u0000\u0000The authors refer to their previous work that connects authoritarian regimes with conservative personality traits, particularly those found in far-right, populist groups. These regimes often promote a patriarchal social structure and rely on religious taboos to maintain control. The authors expand on this theory by exploring Sigmund Freud's concepts of \"totem\" and \"taboo,\" examining how these ideas might explain the behavior of authoritarian regimes. They also refer to Carl Jung's theory of the Shadow and the collective sense of inferiority.\u0000\u0000The article concludes with suggestions on how to counter the spread of authoritarian regimes. The authors advocate for a balanced approach that focuses on finding ways to coexist with authoritarian individuals. They draw parallels between the different neurophysiological functions of the brain's two hemispheres and the potential coexistence of multiple geopolitical blocs.\u0000\u0000The authors reflect on a country that recently shifted from far-right, populist, national governance back to a liberal democratic pattern. They also propose a tool to record personal civic feelings, which can help assess whether a particular region is moving toward or away from autocratic governance.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"73 11","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140985033","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Toni Morrison's novel "The Bluest Eye" intricately delves into the intersections of race, gender, identity, and beauty within the African American community. By following characters such as Pecola Breedlove, Pauline Breedlove, and Cholly Breedlove, Morrison skillfully navigates the intricate web of societal norms and their profound influence on individual psyche and community dynamics. This research article offers a thorough analysis of Morrison's examination of internalized racism, sexism, and the pursuit of self-definition amid oppressive societal standards
{"title":"Unveiling the Layers of Societal Oppression: A Critical Analysis of Toni Morrison’s “The Bluest Eye”","authors":"Sahaya Babina Rose, R. Kavitha, Richard Mwale","doi":"10.32388/hswl8o","DOIUrl":"https://doi.org/10.32388/hswl8o","url":null,"abstract":"Toni Morrison's novel \"The Bluest Eye\" intricately delves into the intersections of race, gender, identity, and beauty within the African American community. By following characters such as Pecola Breedlove, Pauline Breedlove, and Cholly Breedlove, Morrison skillfully navigates the intricate web of societal norms and their profound influence on individual psyche and community dynamics. This research article offers a thorough analysis of Morrison's examination of internalized racism, sexism, and the pursuit of self-definition amid oppressive societal standards\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":" 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140988628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The article takes the view that the conflict in Gaza, involving Israel and Hamas cannot be viewed objectively by assuming that the conflict started on October 7th, 2024. Rather is the conflict a reflection of the pattern of such events and related actions by Israel as the occupying power over 75 years since the declaration of the state of Israel on May 24th, and indeed related conflicts in Palestine prior to that declaration. The article briefly examines to origins of Zionism as an ethic nationalism in the rise of nationalisms in the final 30 years or so of the 19th century. It remarks in particular on the rise of and persistence of Revisionist Zionism and its European neo-liberal roots. It explores the development of Zionism and how it has morphed into a political instrument, going well beyond a benign ethnic nationalism. However, aside from documenting many of the repressive actions of the successive government of Israel since the inception of the state and arguing that Israel’s action following October 7th have been disproportionate, the article explores two potential permanent and practical solutions to the successive conflicts in Palestine: a two-state solution and a confederal solution, both to be guaranteed internationally. The aim of any settlement, it os argued, must provide security and integrity for the state of Israel and the establishment of a similarly recognized and protected Palestinian state. A variety of sources, including Jewish sources, have been used and referenced.
{"title":"[Commentary] Israel: A Problem the World Created (And Now Appears Unable to Solve)","authors":"Michael Lloyd","doi":"10.32388/8l64pm","DOIUrl":"https://doi.org/10.32388/8l64pm","url":null,"abstract":"The article takes the view that the conflict in Gaza, involving Israel and Hamas cannot be viewed objectively by assuming that the conflict started on October 7th, 2024. Rather is the conflict a reflection of the pattern of such events and related actions by Israel as the occupying power over 75 years since the declaration of the state of Israel on May 24th, and indeed related conflicts in Palestine prior to that declaration.\u0000\u0000The article briefly examines to origins of Zionism as an ethic nationalism in the rise of nationalisms in the final 30 years or so of the 19th century. It remarks in particular on the rise of and persistence of Revisionist Zionism and its European neo-liberal roots. It explores the development of Zionism and how it has morphed into a political instrument, going well beyond a benign ethnic nationalism.\u0000\u0000However, aside from documenting many of the repressive actions of the successive government of Israel since the inception of the state and arguing that Israel’s action following October 7th have been disproportionate, the article explores two potential permanent and practical solutions to the successive conflicts in Palestine: a two-state solution and a confederal solution, both to be guaranteed internationally.\u0000\u0000The aim of any settlement, it os argued, must provide security and integrity for the state of Israel and the establishment of a similarly recognized and protected Palestinian state.\u0000\u0000A variety of sources, including Jewish sources, have been used and referenced.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"114 39","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140987859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Bevelacqua Resources 7531 Flint Crossing Circle SE, Owens Cross Roads, AL 35753 USA bevelresou@aol.com The linear non-threshold (LNT) hypothesis is based on the premise that the smallest amount of ionizing radiation produces a biological detriment. It implies that exposure to low-dose radiation be minimized. The LNT approach causes fear and anxiety regarding the beneficial use of radiation and radioactive materials. Contrary to its intended goal of protecting workers and the public, the LNT premise causes physical and economic harm by encouraging radiophobia. KEYWORDS: LNT hypothesis, Hormesis, Dose Thresholds, Radiobiology, Immune System, DNA Repair Mechanisms
Bevelacqua Resources 7531 Flint Crossing Circle SE, Owens Cross Roads, AL 35753 USA bevelresou@aol.com 线性无阈值（LNT）假说的前提是最小量的电离辐射也会对生物产生危害。这意味着应尽量减少暴露于低剂量辐射。LNT 方法导致人们对辐射和放射性物质的有益使用产生恐惧和焦虑。与保护工人和公众的预期目标相反，LNT 前提通过鼓励辐射恐惧症造成了身体和经济上的伤害。
{"title":"The Linear Non-Threshold Hypothesis-A Failed Concept","authors":"J. Bevelacqua","doi":"10.32388/rdo6o0","DOIUrl":"https://doi.org/10.32388/rdo6o0","url":null,"abstract":"Bevelacqua Resources 7531 Flint Crossing Circle SE, Owens Cross Roads, AL 35753 USA bevelresou@aol.com \u0000\u0000 The linear non-threshold (LNT) hypothesis is based on the premise that the smallest amount of ionizing radiation produces a biological detriment. It implies that exposure to low-dose radiation be minimized. The LNT approach causes fear and anxiety regarding the beneficial use of radiation and radioactive materials. Contrary to its intended goal of protecting workers and the public, the LNT premise causes physical and economic harm by encouraging radiophobia.\u0000\u0000KEYWORDS: LNT hypothesis, Hormesis, Dose Thresholds, Radiobiology, Immune System, DNA Repair Mechanisms\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":"1 17","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140988526","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
This article discusses "extreme" Prisoner's Dilemma games, and questions Nash equilibrium as a solution concept in such situations. A slight reformulation of the concept is suggested, securing that a more reasonable solution is chosen. A SMALL WARNING TO THE READER: This article is special, not everything is true. That is, there are fictional parts. The reader is left for deciding what is fictional and what is science. Perhaps we could categorize the paper as a quiz where the objective is to rule out fictional parts from the content which at least is meant to be scientific.
{"title":"The Big M Game","authors":"Kjetil Haugen, Knut P. Heen","doi":"10.32388/mh59xw","DOIUrl":"https://doi.org/10.32388/mh59xw","url":null,"abstract":"This article discusses \"extreme\" Prisoner's Dilemma games, and questions Nash equilibrium as a solution concept in such situations. A slight reformulation of the concept is suggested, securing that a more reasonable solution is chosen.\u0000\u0000A SMALL WARNING TO THE READER: This article is special, not everything is true. That is, there are fictional parts. The reader is left for deciding what is fictional and what is science. Perhaps we could categorize the paper as a quiz where the objective is to rule out fictional parts from the content which at least is meant to be scientific.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":" 10","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140994423","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
The collector and brushless electronic commutation machines have gained widespread utilization in industrial applications. Among these machines, internal permanent magnet synchronous motors (IPMSMs) have become increasingly popular due to their numerous advantages, including high torque/current and torque/inertia ratios, robust construction, high efficiency, and reliability. However, the incorporation of position sensors in IPMSMs has introduced challenges concerning their application, performance, mass production, and cost. Consequently, the implementation of sensorless control techniques has become essential in drive systems and various applications. This paper proposes a backstepping control approach for achieving speed sensorless control of IPMSMs, employing an extended Kalman filter (EKF). The first step involves developing a comprehensive nonlinear dynamical model of the IPMSM in the direct and quadrature (d-q) rotor frame and obtaining its corresponding state-space representation. Subsequently, backstepping controllers for rotor speed and current tracking are designed to ensure precise tracking and anti-disturbance performance. These controllers are integrated into the field-oriented control (FOC) scheme. The Lyapunov stability theorem is employed to guarantee the asymptotic stability condition of the backstepping controller. To address the challenge of estimating immeasurable mechanical parameters of the IPMSM and accurately tracking the system states, an EKF is designed. This filter enables the estimation of mechanical parameters and achieves high steady-state precision within a finite time. The effectiveness of the proposed methodology is demonstrated through simulations conducted under various dynamic operating conditions, including sudden torque load changes, command speed changes, and parameter variations.
{"title":"Backstepping Control Design in Conjunction with an EKF-based Sensorless Field-Oriented Control of an IPMSM","authors":"Ç. Uyulan","doi":"10.32388/ixusw5","DOIUrl":"https://doi.org/10.32388/ixusw5","url":null,"abstract":"The collector and brushless electronic commutation machines have gained widespread utilization in industrial applications. Among these machines, internal permanent magnet synchronous motors (IPMSMs) have become increasingly popular due to their numerous advantages, including high torque/current and torque/inertia ratios, robust construction, high efficiency, and reliability. However, the incorporation of position sensors in IPMSMs has introduced challenges concerning their application, performance, mass production, and cost. Consequently, the implementation of sensorless control techniques has become essential in drive systems and various applications.\u0000\u0000This paper proposes a backstepping control approach for achieving speed sensorless control of IPMSMs, employing an extended Kalman filter (EKF). The first step involves developing a comprehensive nonlinear dynamical model of the IPMSM in the direct and quadrature (d-q) rotor frame and obtaining its corresponding state-space representation. Subsequently, backstepping controllers for rotor speed and current tracking are designed to ensure precise tracking and anti-disturbance performance. These controllers are integrated into the field-oriented control (FOC) scheme. The Lyapunov stability theorem is employed to guarantee the asymptotic stability condition of the backstepping controller.\u0000\u0000To address the challenge of estimating immeasurable mechanical parameters of the IPMSM and accurately tracking the system states, an EKF is designed. This filter enables the estimation of mechanical parameters and achieves high steady-state precision within a finite time. The effectiveness of the proposed methodology is demonstrated through simulations conducted under various dynamic operating conditions, including sudden torque load changes, command speed changes, and parameter variations.\u0000","PeriodicalId":500839,"journal":{"name":"Qeios","volume":" 20","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-05-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"140996169","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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