Observer Design Research Articles

Optimal Sliding Gaussian Control of Quadrotor with a Flexible Structure

Optimal sliding Gaussian control of a quadrotor aerial vehicle with a flexible structure has been demonstrated in six-degree-of-freedom flight simulation to be more robust to structural excitation than a standard proportional-derivative control scheme. A general derivation of the optimal sliding Gaussian controller, including an optimal gain selection algorithm and observer design, is presented. Additionally, a brief development of the equations of motion for a quadrotor with a flexible structure is provided as background for the nonlinear six-degree-of-freedom flight simulation results. Robustness properties of the optimal sliding Gaussian controller are evaluated using singular value analysis of linearized models of the closed-loop quadrotor with a flexible structure. Flight simulation and singular value analysis results illustrate the robustness improvements of optimal sliding Gaussian control over the standard proportional-derivative controller design.

Robust Stability Condition and Simplified Design of Filter-embedded Disturbance Observer

Robust Stability Condition and Simplified Design of Filter-embedded Disturbance Observer

Pengaruh antara Tingkat Kepatuhan Orang Tua dalam Menjalankan Home Program dengan Kemampuan Pragmatik pada Anak ASD di PLDPI Kota Surakarta

Background: The presence of parents as one of the components in society is one of the supporting components in the growth and development process of autistic children. Parental support becomes one of the factors for the success of therapies conducted by children, such as providing full support to the child, motivating the child, consulting about the child's issues, as well as parenting style. Regarding the pragmatic abilities of children with autism, they have difficulties in developing interactive conversations. This happens because the symptoms of autism make it difficult for them to understand and predict the thoughts and feelings of others. Objectives: This study aims to determine whether there is an Influence Between Parental Compliance Level in Conducting Home Programs and Pragmatic Abilities in Children with Autism Spectrum Disorder at PLDPI Surakarta City. Methods: This research is a quantitative study with an observational analytic research design, and the experimental design used is the One group pretest-posttest design. The sample size in this study is 30 autistic children at PLDPI Surakarta City using the Purposive Sampling technique. The statistical test used is Spearman rank.Results: The description of parental compliance in conducting home programs yielded highly compliant results from 17 respondents, compliant from 9 respondents, and less compliant from 4 respondents. The description of pragmatic abilities in autistic children yielded highly capable results from 6 respondents, capable from 9 respondents, and less capable from 15 respondents. The Spearman's rank correlation test results showed ρ = 0.000 (ρ < 0.05 = Ha accepted), with an r value of 0.619 and a positive correlation direction. Conclusion: Based on the analysis of the data, it can be concluded that there is an influence between the level of parental compliance in conducting home programs on pragmatic abilities in children with Autism Spectrum Disorder at PLDPI Surakarta City. The strength of the influence between these two variables falls into the strong category. Keywords: Level of Parental Compliance, Home Program, Pragmatic Ability, Children with Autism Spectrum Disorder

The Relationship of Age, Gender, and Socio-Economic Factors with Patients Anxiety Levels (A Review of Early Adult Patients at the Gusti Hasan Aman Oral and Dental Hospital, Banjarmasin)

ABSTRACT The definition of dental anxiety is fear of dental procedures. The prevalence of dental anxiety was found to range from 5.7% to 20.2% across all age groups and was closely related to sociodemographic factors such as age, gender, and socioeconomic status. For patients between the ages of 18 and 40, dental anxiety can be the result of traumatic formative experiences involving dental and oral care. To analyze the relationship of sociodemographic factors which include age, gender, and socioeconomic the level of patient anxiety about treatment at the dentist based on early adulthood at RSGM Gusti Hasan Aman Banjarmasin, South Kalimantan. The investigation employed a cross-sectional, analytic observational design. According to the research criteria, the sample size was calculated using the correlative analytic formula, which yielded 85 respondents. This study utilized the Kleinknecht DFS (Dental Fear Survey) to assess the anxiety level of early adult patients in the field of dental care. This questionnaire consists of 20 questions grouped into three dimensions: avoidance of dental appointments, patient's physiological reactions, and stimulation of specific dental anxiety. There is a correlation between sociodemographic factors and dental anxiety at the Gusti Hasan Aman General Hospital in Banjarmasin, as demonstrated by a significance level of 0.05 for the Spearman test. Sociodemographic factors which include age, gender, and socio-economic relationship with the level of dental care anxiety in early adult patients. Keywords: Dental Anxiety, Sociodemography, Early Adulthood, Gender, Socieconomic

Adaptive Observer Design for Heat PDEs With Sensor Delay and Parameter Uncertainties

Adaptive Observer Design for Heat PDEs With Sensor Delay and Parameter Uncertainties

Discrete-time Luenberger observer design for Lithium-ion battery state-of-charge with stability guarantee

State-of-charge (SOC) estimation is particularly important as it provides information about the remaining energy capacity of the battery, allowing for better planning and utilization. Accurate SOC estimation is challenging because it cannot be directly measured from the battery. Instead, it is estimated by analyzing measurable variables such as current and voltage. To address this challenge, a discrete-time observer-based SOC estimation approach is proposed in this paper. This approach utilizes a second-order equivalent circuit model and a piecewise linear approximation to represent the relationship between SOC and open circuit voltage (OCV). The proposed observer-based approach utilizes these models to estimate the SOC with assured asymptotic stability under specific assumptions to simplify the design process. Simulations in Python are conducted to evaluate the performance of the designed observer. In the simulations, the SOC estimation under various conditions, such as model uncertainty, disturbances, and measurement noise, is also covered. In addition, three different observer gains are considered in the simulations. Lastly, simulation studies indicate that the estimated SOC values converge to the real SOC values, with some different behavior depending on the regarded situations.

Analysis of Factors Influencing the Behavior of Utilization of Dental and Oral Health Care Among Primary Students

Dental and oral health is an integral part of overall health services. One effort that can be used to improve children's dental and oral health is through self-focused health promotion activities in schools through UKGS. The aim of the research was to determine the factors that influence the behavior of using dental and oral health care among elementary school students in Talok Village, Malang Regency. Observational research design with a cross-sectional approach. The population of all students in Talok, Malang was 145 respondents. The sample was 106 respondents with purposive sampling technique. Independent variables are health center support, school support, parent support, and student knowledge. The dependent variable is beviour of utilization of dental and oral health care among primary students.

Adaptive fuzzy optimal output-feedback fault-tolerant control for the USV system with intermittent actuator faults

This paper presents a novel fuzzy optimal output-feedback fault-tolerant control (FTC) method for uncertain nonlinear unmanned surface vehicle (USV) systems, which are subject to intermittent actuator failures and unmeasured states. The proposed optimal controller is composed of a fuzzy feedforward fault-tolerant output-feedback controller and a fuzzy error feedback optimal controller. The fuzzy feedforward fault-tolerant output-feedback controller is designed by using the fuzzy state observer and backstepping control design technique. The fuzzy optimal feedback controller is given by adopting adaptive dynamic programming (ADP) theory. It is proven that the presented fuzzy optimal FTC scheme is able to ensure that the USV system is uniformly ultimately bounded (UUB), and the optimal control performance is achieved. The validity is confirmed by computer simulation results.

Antibody response to SARS-CoV2 before and after the third vaccination in patients with Inflammatory Bowel Disease.

Introduction Patients with inflammatory bowel disease (IBD) receiving immunosuppressive therapy might have an increased risk of developing a severe course of SARS-CoV-2 infection. The aim of this study was to investigate the development of antibodies in immunosuppressed patients with IBD compared to a healthy control group and to determine the effect of immunmodulators on the level of anti-SARS-CoV-2 IgG antibody levels before and after a third vaccination against SARS-CoV-2. Methods This is a single-center study with a retrospective observational design. Seventy-one IBD patients matched by propensity score to 71 healthy employees (control group) were included. Blood was taken from both groups at predetermined times before and after the third booster vaccination. Results All patients with IBD (n=71, 100%) received immunomodulatory therapy. The mean antibody level before the third vaccination was 1352.88 U/ml (SD= 1011.489) in the IBD group and were not lower compared to the control group (p= 0.088). Gender, age, and disease duration had no significant impact on the development of antibody levels. Patients with TNF-alpha blockers had significantly lower antibody titers (p=0.011) compared to the control group. Patients with integrin inhibitor therapy had significantly higher antibody titers (p=0.003) than the controls. After the third vaccination, an increase in antibody titers was recorded in all patients in the IBD group. Conclusion We recorded an antibody titer in all patients with IBD that was not significantly lower compared to healthy controls despite immunomodulatory therapy. The booster vaccination led to an increase in antibody levels in all patients with IBD.

Impact of stress coping style on self-care behaviors and prognosis in patients with heart failure: A prospective longitudinal observational study

BackgroundHeart failure (HF) requires effective management and self-care education to improve outcomes. However, daily self-care routines necessary for managing HF can lead to psychological issues, including stress, potentially exacerbating the condition. Patient stress-coping behaviors may significantly impact prognosis. ObjectiveWe aimed to identify stress coping styles in patients with HF and examine their impact on self-care behavior and prognosis. s. MethodsThis study utilized a longitudinal prospective observational design. Patients were categorized into task-oriented (task), emotion-oriented (emotion), and avoidance (avoidance) coping groups using the Coping Inventory for Stress Situations. Stress levels and self-care behaviors were evaluated during hospitalization and 1 and 3 months after discharge. The primary outcome was a composite of HF readmission and all-cause mortality during the 180-day post-discharge period. Longitudinal changes in self-care behaviors were assessed according to stress intensity. ResultsWe included 151 patients (age, 74 [60–80] years; female, 37.1 %) hospitalized for HF exacerbation between August 2021 and August 2023. The task group comprised 45 patients (29.8 %); emotion group, 47 (31.1 %); and avoidance group, 59 (39.1 %). The avoidance group had a higher risk of adverse events during follow-up (task, emotion, and avoidance: 8.9 % vs. 14.9 % vs. 32.2 %, p = 0.004). The avoidance-coping style was the only independent predictor of the primary outcome (hazard ratio: 3.84, 95 % confidence interval: 1.40–10.53, p = 0.009). Self-care behaviors were notably poorer in the Avoidance group, particularly under conditions of high stress. ConclusionsStress-coping strategies impact both prognosis and self-care outcomes in patients with HF, and education programs should consider incorporating these strategies.

Effects of Alternative Wrist Grip Techniques on Pain, Strength, and Function in the Wrists of Novice Weightlifters

Introduction. The wrist, with its composite anatomical composition, is deemed the most complex joint in the human body, vital for multifaceted hand movements. However, diseases or injuries can significantly impair wrist function, necessitating a comprehensive understanding of its anatomy and biomechanics. Concurrently, weightlifting, a popular exercise regimen, demands precise wrist functionality for optimal performance. Objective. This study investigates the influence of alternative wrist grip methods and wrist strength on wrist function among novice weightlifters. Method. Through a cross-sectional observational design, data was collected from 88 participants, aged 16 to 35 years, encompassing wrist pain, strength, and functionality. Bench and shoulder press exercises were performed, with grip methods discreetly noted. Wrist strength was measured using a dynamometer, while functionality was assessed through the Patient Rated Wrist Evaluation (PRWE) questionnaire, and goniometer-assisted range of motion assessments were done. Results. Descriptive statistics unveiled diverse characteristics among participants, including age, wrist strength, BMI, pain ratings, PRWE scores, and wrist range of motion, underscoring individual differences in wrist functionality. Average wrist strength values further highlighted these variations. Conclusion. These findings provide valuable insights into the intricate relationships between grip methods, wrist strength, and overall wrist functionality among beginner weightlifters, offering a foundation for targeted interventions to optimize wrist health and enhance performance. This literature found out that the overall wrist function and strength of both dominant and non-dominant wrists were better in participants of neutral wrist group. Participants of extended wrist group were experiencing more pain as compared to neutral wrist group.

The relationship of passion to sport specialization, injury, and burnout in NCAA Division 1 college athletes

Abstract: Introduction: Passion can be described as a strong inclination toward an activity and has previously been utilized to characterize numerous facets of student-athlete lives. However, the correlation between passion, injury, and burnout has not been thoroughly investigated. Therefore, the primary focus of this study is to identify the passion scores of current National Collegiate Athletic Association (NCAA) Division I student-athletes and describe the correlation of passion and burnout in athletes and define the potential relationship of passion with athlete injury. Methods: The research team utilized an observational study design that implemented a cross-sectional survey. Following Institutional Review Board approval and obtaining informed consent, REDCap electronic data capture tools was utilized to collect demographic information, the Passion Scale, and the Athlete Burnout Questionnaire. Correlation and multiple linear regression were used to assess the relationship between passion scores and athlete injury. Results: The average age of participants was 19.9 years old. Although sport participation characteristics were comparable between genders, females indicated significantly greater exhaustion burnout scores and obsessive passion compared to males but were otherwise comparable. General and harmonious passion showed significant negative correlations with reduced accomplishment, sport devaluation, and exhaustion burnout. Conclusion: While the results indicate that variation in both general and harmonious passion scores are associated with sport type, it is unclear whether assessment of specific sports are adequately represented within our analysis and as such, should be interpreted with caution. Future studies should focus on specific sports to better understand their association to passion, burnout, and risk of injury.

Hubungan Diabetes Melitus Tipe 2 dengan Derajat Obstruksi Penyakit Paru Obstruktif Kronik (PPOK) di RS. Royal Prima Periode 2022-2023

Type 2 Diabetes Mellitus (T2DM) is one of the most common comorbidities in patients with Chronic Obstructive Pulmonary Disease (COPD). COPD itself can be a risk factor in the development of T2DM through systemic inflammatory mechanisms caused by continuous and progressive exposure to cigarette smoke over time. To investigate the relationship between diabetes mellitus and the severity of COPD obstruction based on demographic data, spirometry test results, and fasting blood glucose (FBG) test results. This study used a quantitative method with an observational descriptive design. Sampling was done using total sampling technique with a cross-sectional survey design and a retrospective approach using secondary data. Out of 31 study subjects diagnosed with COPD and T2DM, 83.9% (26 subjects) were male and 16.1% (5 subjects) were female. In terms of age distribution, the 40–59-year age group had the highest frequency, totaling 18 individuals (58.1%). In terms of occupation, self-employed individuals represented the largest group with 24 subjects (77.4%). For COPD severity, the highest frequency was found in the severe COPD category, with 15 subjects (48.4%). Based on the results of the study investigating the relationship between Type 2 Diabetes Mellitus and the severity of COPD obstruction, a significant relationship was found between T2DM and COPD obstruction severity when analyzed by gender, age, occupation, and the results of spirometry and fasting blood glucose tests.

Operating room radiation safety measures: Awareness, compliance, and perceived risks among nurses and other healthcare workers.

This study evaluates and compares nurses' and other healthcare workers' awareness of and compliance with radiation protection measures in operating rooms and their perceived susceptibility to occupational illness due to radiation exposure. Compliance with radiation safety measures minimises occupational radiation exposure risks. Understanding the role of perceived susceptibility to occupational illness in motivating compliance and awareness can enhance safety interventions. Using a questionnaire-based cross-sectional observational design, this study targeted nurses, physicians, and radiologic technologists working in Saudi Arabian operating rooms. The survey measured awareness of and compliance with radiation protection measures and perceived susceptibility to occupational illness. The STROBE checklist was followed to ensure methodological rigour. Nurses demonstrated the lowest awareness and compliance, and the highest perceived susceptibility to occupational illnesses compared to other healthcare professionals. There was a moderate positive correlation between increased awareness of safety measures and compliance, but a weaker correlation between adherence and perceived risk. Nurses' compliance and awareness did not align with their risk perceptions, suggesting a cognitive-behavioural gap in which stronger risk perceptions among nurses do not lead to proactive protective behaviours. This discrepancy may be attributed to the demanding nature of nursing duties, which often overshadow strict adherence to safety protocols. The study identified significant disparities in radiation safety practices, with nurses demonstrating less awareness and compliance but higher risk perceptions than other healthcare professionals. Interventions are needed to bridge the gap between perceived risk and actual safety behaviours. Role-specific training programmes and continuous education are needed to enhance radiation safety practices among nurses. Policies must support these educational efforts, ensuring that nurses can balance patient care responsibilities with radiation protection measures.

A dynamic event-triggered approach for observer-based formation control of multi-agent systems with designable inter-event time

This paper addresses the leader-following formation control problems for generic linear multi-agent systems under directed topology with designable inter-event time. A synthesis approach combining controller and observer design is developed under a dynamic event-triggered communication and control scheme. The proposed feedback control, state estimation, and event-triggered rules are distributed, and only local information is required for each agent to implement these algorithms. The proposed dynamic event-triggered protocol incorporates model-based estimation and clock-like auxiliary dynamic variables to prolong the inter-event time and economize the network resources. Furthermore, the inter-event time is designable, which allows more flexible tuning of communication frequency with only minor performance degradation. Sufficient conditions for formation control are established by linear matrix inequalities. The proposed method exhibits significant improvement over the dynamic event-triggered control methods described in the existing literature. Compared to the existing static event-triggered strategy, the proposed approach significantly reduces the utilization of communication resources while preserving asymptotic convergence to the desired formation. Comparative simulations demonstrate the validity and effectiveness of the proposed theoretical results.

Puberty and NeuroDevelopment in adolescents (PANDA): a study protocol

BackgroundBiopsychosocial changes during adolescence are thought to confer risk for emotion dysregulation, and in particular, anxiety disorders. However, there are substantial gaps in our knowledge about the biological mechanisms underlying anxiety during adolescence, and whether this contributes to the higher prevalence in females. The Puberty and NeuroDevelopment in Adolescents (PANDA) study aims to examine links between biological (sex hormones, cortisol) and social environmental factors and brain function during adolescence, with a focus on key processes (emotion regulation, fear learning) identified as relevant for the development of anxiety disorders.MethodsPANDA is a cross-sectional study with an observational design that aims to recruit a total of 175 adolescents aged 11-16 (majority female) and their parents/guardians, from the community. Brain function will be examined using magnetic resonance imaging (MRI), including functional MRI tasks of emotion regulation and fear learning. Hormones will be measured from hair (i.e., cortisol) and weekly saliva samples (i.e., oestradiol, progesterone, five across a month in females). Questionnaires and semi-structured interviews will be used to assess mental health and social environmental factors such as parenting and adverse childhood experiences. An online study of 113 adolescents was also incorporated during the COVID-19 pandemic as a questionnaire-only sub-study.DiscussionStrengths of this study include the collection of multiple saliva samples to assess variability in hormone levels, examination of the timing of adverse childhood experiences, inclusion of both maternal and paternal parental factors, exploration of mechanisms through the examination of brain structure and function, and multi-method, multi-informant collection of mental health symptoms. This study addresses important gaps in the literature and will enhance knowledge of the biological and environmental contributors to emotion dysregulation and anxiety in adolescents.

The epidemiology of low back pain in chiropractors and chiropractic students: a systematic review of the literature.

Chiropractors and chiropractic students commonly report low back pain (LBP). However, the burden of LBP in this occupational group has not been synthesized in the literature. This systematic review aims to describe the epidemiology of LBP in chiropractors and chiropractic students. We searched MEDLINE, Embase, CINAHL, and PsycINFO from inception to May 1, 2023. Eligible studies were cross-sectional, cohort, or case-control studies investigating the prevalence, incidence, associated factors, or risk factors of LBP in chiropractors or chiropractic students. Reviewers independently screened articles and assessed risk of bias using the appropriate JBI Checklists for the observational study design. We descriptively synthesized studies that were rated as low or moderate risk of bias. Of 2012 citations screened, we included 2 cross-sectional studies in the evidence synthesis (1 study rated as moderate risk of bias on chiropractors, and 1 rated as low risk of bias on chiropractic students). For chiropractors, the 12-month prevalence of work-related overuse injuries to the low back was 35.6% (95% CI 29.1, 42.0) in women and 22.4% (95% CI 16.3, 29.6) in men. The 12-month prevalence of work-related acute physical injuries to the low back in chiropractors were 3.4% (95% CI 1.6, 6.8) for women and 0.7% (95% CI 0.1, 3.7) for men. Among chiropractic students, the 1-week prevalence of LBP was 69% (95% CI 64.8, 73.0). This was higher among female students (72.5%, 95% CI 67.1, 77.4) and lower among male students (64%, 95% CI 57.0, 70.6). There is limited high-quality evidence on the epidemiology of LBP in chiropractors and chiropractic students. Our systematic review provides a synthesis of the body of literature, highlighting that chiropractors and chiropractic students commonly report LBP. Future high-quality research is needed to address the incidence, associated factors, and risk factors of LBP.

MRI-Based Prediction of Macrovascular Causes of Intracerebral Hemorrhage: The MACRO Score.

Although most spontaneous intracerebral hemorrhages (ICHs) are due to cerebral small vessel diseases (SVDs), between 1 in 7 and 1 in 10 are due to a macrovascular cause. Rapid diagnosis has important therapeutic and prognostic implications but sometimes requires digital subtraction angiography (DSA), an invasive procedure which cannot be performed in all patients. MRI provides optimal sensitivity for markers of SVD but was not included in previous risk stratification scores. We aimed to create and validate a risk stratification score for macrovascular causes of ICH including MRI findings to guide diagnosis and further investigations. We pooled data from 2 large observational study cohorts (London/United Kingdom and Graz/Austria) of consecutive patients with ICH who had brain MRI and at least 1 angiographic modality within 90 days of symptom onset. The primary outcome was a macrovascular cause of ICH (arteriovenous malformation/dural arteriovenous fistula, aneurysm, cavernoma, or cerebral venous thrombosis), with the diagnosis based on neurovascular multidisciplinary meetings. Using lasso logistic regression, we built the MRI Assessment of the Causes of intRacerebral haemOrrhage (MACRO) score to assess the probability of a macrovascular cause. We performed internal validation using bootstrapping and external validation in an independent cohort (Bern/Switzerland). We included 1,043 patients with ICH (mean age 66 years, 42% female), 78 of whom had a macrovascular cause (7.5%). The final score includes age (0-39, 40-69, or ≥70), location of ICH (lobar, deep, or infratentorial), and SVD markers on MRI (≥1 microbleed, ≥1 lacune, presence of cortical superficial siderosis, or white matter hyperintensities using the Fazekas scale). The MACRO score showed an optimism-adjusted c-statistic of 0.90 (95% CI 0.88-0.93), superior to existing CT-based scores (p < 0.001). In external validation, the c-statistic was 0.87 (95% CI 0.80-0.94). MACRO scores ≥6 (59.5% of patients) indicated a very low risk of a macrovascular cause (0.2%), while scores ≤2 (9% of patients) indicated a high risk (48.9%). The MRI-based MACRO score shows excellent performance in predicting the likelihood of macrovascular causes of spontaneous intracerebral hemorrhage, making it useful in guiding further investigations. Important limitations include the observational study design and the performance of DSA in a minority of patients.

Piloting an Educational Approach to Assess eHealth Literacy and Evidence-Based Medicine in Integrative Health: A Feasibility and Validation Study.

Introduction: Low rates of online health literacy put consumers at risk of misinformation, but this could be mitigated through practitioner engagement. Integrative health (IH) crosses health care disciplines, so it is well-positioned to improve health information sharing. IH practitioners require evidence-based medicine (EBM) and electronic health literacy (eHL) competencies to make such impact. Several EBM assessments exist, but none are IH-specific. The Fresno Test of EBM FEBM is a validated, performance-based assessment used in medical education. We sought to assess feasibility of incorporating eHL and EBM assessments into graduate coursework while adapting and validating the FEBM for an IH audience (FEBM-IH). Methods: A pilot observational design was used to adapt, evaluate, administer, and validate the FEBM-IH. Revalidation of the FEBM-IH began with a discipline-focused adaptation, which was reviewed by an expert panel. The FEBM-IH was then administered to IH students and faculty. Independently scored assessments determined inter-rater reliability, internal consistency, item discrimination, and item difficulty. eHL assessments (eHEALS and General Health Numeracy Test-6) were also embedded in the online course. Results: Outcome completion rates suggest the FEBM-IH and eHL assessment tools are feasible to include in online courses, with 68.9% (102/148) eligible participants joining and 76.5% (78/102) completing all questions in all measures. The FEBM-IH demonstrated excellent assessor agreement (kappa = 0.97, p < 0.001), high internal consistency (α = 0.799), and acceptable item discrimination (0.26-0.68). Median self-perceived eHL scores increased from 30/40 to 33/40 points by course's end, suggesting some increase in eHL. Conclusions: Tools were feasible to integrate; FEBM-IH maintains acceptable validity; and further exploration of the relationship between EBM and eHL is warranted.

Observer Design for Fractional-Order Polynomial Fuzzy Systems Depending on a Parameter

For fractional-order systems, observer design is remarkable for the estimation of unavailable states from measurable outputs. In addition, the nonlinear dynamics and the presence of parameters that can vary over different operating conditions or time, such as load or temperature, increase the complexity of the observer design. In view of the aforementioned factors, this paper investigates the observer design problem for a class of Fractional-Order Polynomial Fuzzy Systems (FORPSs) depending on a parameter. The Caputo–Hadamard derivative is considered in this study. First, we prove the practical Mittag-Leffler stability, using the Lyapunov methods, for the general case of Caputo–Hadamard Fractional-Order Systems (CHFOSs) depending on a parameter. Secondly, based on this stability theory, we design an observer for the considered class of FORPSs. The state estimation error is ensured to be practically generalized Mittag-Leffler stable by solving Sum Of Squares (SOSs) conditions using the developed SOSTOOLS.