Correct Choice Research Articles

Outlier-robust unit root tests for score-driven models: critical values and applications

ABSTRACT Score-driven models for the t distribution are robust to outliers because outliers are discounted in the updating terms of the filters. We suggest outlier-robust unit root tests using two important score-driven models for the t distribution, the quasi-autoregressive (QAR) model and the Beta- t -EGARCH (exponential generalized autoregressive conditional heteroskedasticity) model. QAR and Beta- t -EGARCH have covariance stationary and unit root versions. The updating terms of these models are information-theoretically optimal extensions of the updating terms of the AR and GARCH models, respectively. For the asymptotic theory of the maximum likelihood (ML) estimation of the QAR and Beta- t -EGARCH models, the correct choice of the order of integration is important. QAR and Beta- t -EGARCH discount outliers in the filters, partly due to this, the covariance stationarity statistics are almost 1 in many applications. Motivated by these points, our contribution is to report unit root test critical value tables for QAR and Beta- t -EGARCH using extensive Monte Carlo simulation experiments. We present an application of the QAR unit root tests for the United States (US) inflation rate from January 1961 to June 2023. We present applications of the Beta- t -EGARCH unit root test for the NASDAQ Composite, S&P 500, and Bitcoin volatility from August 2018 to August 2023.

The Effect of Sample Size on the Interpolation Algorithm of Frequency Estimation

Fast and accurate frequency estimation is essential in various engineering applications, including control systems, communications, and resonance sensing systems. This study investigates the effect of sample size on the interpolation algorithm of frequency estimation. In order to enhance the accuracy of frequency estimation and performance, we describe a novel method that provides a number of approaches for calculating and defending the sample size for of the window function designs, whereas, the correct choice of the type and the size of the window function makes it possible to reduce the error. Computer simulation using Matlab / Simulink environment is performed to investigate the proposed procedure's performance and feasibility. This study performs the comparison of the interpolation algorithm of frequency estimation strategies that can be applied to improve the accuracy of the frequency estimation. Simulation results shown that the proposed strategy with the Parzen and Flat-top gave remarkable change in the maximum error of frequency estimation. They perform better than the conventional windows at a sample size equal to 64 samples, where the maximum error of frequency estimation is 2.13e-2, and 2.15e-2 for Parzen and Flat-top windows, respectively. Moreover, the efficiency and performance of the Nuttall window also perform better than other windows, where the maximum error is 7.76×10-5 at a sample size equal to 8192. The analysis of simulation result showed that when using the proposed strategy to improve the accuracy of the frequency estimation, it is first essential to evaluate what is the maximum number of samples that can be obtained, how many spectral lines should be used in the calculations, and only after that choose a suitable window.

The Impact of Teaching Style and Course Structure on Intermediate Accounting Students Understanding

Many students face great difficulties in completing Intermediate Accounting courses well. One of the factors that is considered influential is the teaching style. Another factor that can affect students' understanding in studying Intermediate Accounting is the learning structure (course structure). A good learning must include the correct and coherent choice of topics in order to present the learner's point of view and not only from the point of view of experts, in this case lecturers (experts). Based on the results of the research test, the following results can be obtained: 1) Teaching Style has a significant positive effect on students' understanding of the Intermediate Accounting Course; 2) Course Structure has a significant positive effect on Student Understanding in the Intermediate Financial Accounting Course. The implication of this study is that the application of the theory of interpersonal behavior is answered. The results show that this theory can be a valuable tool for understanding and improving interpersonal relationships, and for identifying strategies for solving problems. Furthermore, the practical implications show that the existence of the right teaching style and a course structure that is structured and based on the principle of interrelation between materials can increase student learning motivation because students feel that they can follow the learning flow better. With a clear structure, students tend to understand the concept thoroughly and uninterruptedly

A multicentre prospective registry of one thousand sepsis patients admitted in Indian ICUs: (SEPSIS INDIA) study

BackgroundSepsis is a global health problem with high morbidity and mortality. Low- and middle-income countries have a higher incidence and poorer outcome with sepsis. Large epidemiological studies in sepsis using Sepsis-3 criteria, addressing the process of care and deriving predictors of mortality are scarce in India.MethodA multicentre, prospective sepsis registry was conducted using Sepsis 3 criteria of suspected or confirmed infection and SOFA score of 2 or more in 19 ICUs in India over a period of one year (August 2022–July 2023). All adult patients admitted to the Intensive Care Unit who fulfilled the Sepsis 3 criteria for sepsis and septic shock were included. Patient infected with Covid 19 were excluded. Patients demographics, severity, admission details, initial resuscitation, laboratory and microbiological data and clinical outcome were recorded. Performance improvement programs as recommended by the Surviving Sepsis guideline were noted from the participating centers. Patients were followed till discharge or death while in hospital.ResultsRegistry Data of 1172 patients with sepsis (including 500 patients with septic shock) were analysed. The average age of the study cohort was 65 years, and 61% were male. The average APACHE II and SOFA score was 21 and 6.7 respectively. The majority of patients had community-acquired infections, and lung infections were the most common source. Of all culture positive results, 65% were gram negative organism. Carbapenem-resistance was identified in 50% of the gram negative blood culture isolates. The predominant gram negative organisms were Klebsiella spp (25%), Escherechia coli (24%) and Acinetobacter Spp (11%). Tropical infections (Dengue, Malaria, Typhus) constituted minority (n = 32, 2.2%) of sepsis patients. The observed hospital mortality for the entire cohort (n = 1172) was 36.3%, for those without shock (n = 672) it was 25.6% and for those with shock (n = 500) it was 50.8%. The average length of ICU and hospital stay for the study cohort was 8.64 and 11.9 respectively. In multivariate analysis adequate source control, correct choice of empiric antibiotic and the use of intravenous thiamine were protective.ConclusionThe general demographics of the sepsis population in the Indian Sepsis Registry is comparable to Western population. The mortality of sepsis cohort was higher (36.3%) but septic shock mortality (50.8%) was comparable to Western reports. Gram negative infection was the predominant cause of sepsis with a high incidence of carbapenem resistance. Eschericia coli, Klebsiella Spp and Acinetobacter Spp were the predominant causative organism. Tropical infection constituted a minority of sepsis population with low hospital mortality. The SOFA score on admission was a comparatively better predictor of poor outcome. Sepsis secondary to nosocomial infections had the worst outcomes, while source control, correct empirical antibiotic selection, and intravenous thiamine were protective.CTRI Registration CTRI:2022/07/044516.

Early Voter Engagement Through Smart Voting Movement RRI Makassar

General elections target novice voters as a flying vote. Novice voters are those who are eligible to participate in general elections for the first time with a minimum age of 17 years. Among them are class XII SMA/MA or new students. In the 2024 General Election, novice voters as a whole dominated the permanent voter list (DPT) with a number reaching around 56.45% of the total voters. However, the level of voter participation has decreased, due to disappointment in the results of previous elections and local elections. Various problems have resulted in a decrease in voter participation, including the tendency of pragmatic political elites who do not want to know about citizens' participation rights. In order to increase public confidence in domestic democracy, a strategy to increase political participation is needed. The development of Indonesian politics must be known to all citizens, in order to understand the correct political choices and in accordance with decisions without tendency and intimidation according to applicable rules. The research method used is descriptive qualitative method, because it explores the phenomenon in depth. The Smart Choosing Movement (GCM) is effective in increasing political awareness among first-time voters. GCM succeeded in raising awareness of the importance of elections, government functions, and rights and responsibilities as citizens. GCM is effective in increasing understanding of the electoral process, from registration to voting. The program is able to increase the motivation of novice voters to be directly involved in elections.

Integrated Photovoltaic Systems in Ecorubarchitecture

Implementation of integrated photovoltaic systems in building construction represents a strategic step in ecourbarchitectonic, functionally innovated formation of building with an altered esthetics and artistic understanding of spatial compositions. In such a concept, there are renewable energy sources which with modular solar panels bring about a high architectonic quality. They are an integral part of the structure, generating photovoltaic energy. The advent of BIPV technologies opened a very important city-building topic on future harmonic formation of the houses, their positioning and layout orientation in relation to the natural and artifact environment, as well as on the organic, environmental interpolation of physical structures into the existing urban fabric. In general, it is a strategic question of urbanity in terms of further formation of the appearance of houses, streets, squares and plazas in different climates. In the focus is a correct choice of the type of BIPV facades and building material which will improve its performance.

A versatile conformal circularly polarized quad-element antenna for X-band applications

This article presents a flexible four-element antenna for X-band applications. The proposed antenna covers the spectrum ranging from 10.6 to 11.9 GHz, including a significant portion of the X-band. The single antenna element comprises a modified E-shaped radiating patch, which is fed by a unique feeding structure consisting of a 50-Ω feeding strip connected with two rectangular stubs on both sides. All antenna elements are printed on a flexible felt 60 mm × 60 mm × 1 mm (2.12 λ × 2.12 λ × 0.035 λ at 10.6 GHz) substrate. The proposed antenna exhibits circular polarization over the desired bans of operation with an axial ratio (< 3 dB) bandwidth of 1.2 GHz, which is significant for X-band applications. The designed antenna is manufactured and practically tested. Both simulated and measured results agree well with each other, ensuring the optimal performance of the antenna. Moreover, the antenna achieves a maximum gain of up to 8 dBi in the desired band of operation. Further MIMO parameters, including envelope correlation coefficient (ECC), diversity gain (DG), channel capacity loss (CCL), and mean effective gain (MEG), are calculated to validate the MIMO performance. Finally, a conformal analysis was carried out to study the robustness of the antenna in various bending scenarios. Results show that the antenna reported in this article is the correct choice for conformal X-band MIMO applications.

Machine learning models for river flow forecasting in small catchments.

In consideration of ongoing climate changes, it has been necessary to provide new tools capable of mitigating hydrogeological risks. These effects will be more marked in small catchments, where the geological and environmental contexts do not require long warning times to implement risk mitigation measures. In this context, deep learning models can be an effective tool for local authorities to have solid forecasts of outflows and to make correct choices during the alarm phase. In this study, we investigate the use of deep learning models able to forecast hydrometric height in very fast hydrographic basins. The errors of the models are very small and about a few centimetres, with several forecasting hours. The models allow a prediction of extreme events with also 4-6h (RMSE of about 10-30cm, with a forecasting time of 6h) in hydrographic basins characterized by rapid changes in the river flow rates. However, to reduce the uncertainties of the predictions with the increase in forecasting time, the system performs better when using a machine learning model able to provide a confidence interval of the prediction based on the last observed river flow rate. By testing models based on different input datasets, the results indicate that a combination of models can provide a set of predictions allowing for a more comprehensive description of the possible future evolutions of river flows. Once the deep learning models have been trained, their application is purely objective and very rapid, permitting the development of simple software that can be used even by lower skilled individuals.

Iatrogenic Cardiac Arrest During Thyroid Storm.

Thyroid storm is a life-threatening condition with often severe cardiac implications. Correct treatment choices can vary depending on underlying cardiac systolic function. We present a case of a 47-year-old male with untreated Grave's disease who presented with a thyroid storm. After propranolol administration, he experienced a cardiac arrest with the return of spontaneous circulation after cardiopulmonary resuscitation. Further evaluation revealed severe thyroid-induced cardiomyopathy with left ventricular ejection fraction of 15-20%, which had decreased from 60-65% over one year. The patient was discharged home on hospital day 8 after an unremarkable ischaemic work-up. He experienced a full cardiac systolic function recovery with an ejection fraction of 60-65% at the 90-day follow-up. Thyroid storm can present with overt or subclinical heart failure. Prompt evaluation of cardiac systolic function with a transthoracic echocardiogram before beta-blockade and the use of shorter-acting beta blockers can prevent devastating suppression of myocardial function. Despite being first-line therapy, beta blockers can be beneficial or devastating in thyroid storm patients depending on the presence of low cardiac output or high cardiac output heart failure.Clinical awareness, prompt echocardiography and the use of shorter half-life beta blockers can prevent rapid cardiac deterioration in thyroid storm patients.

The Vascular Anatomical Basis for a Well-Designed Reconstruction of the Ala Nasi by a Microsurgical Preauricular Flap Technique

Background: A microsurgical auricular flap represents a single-step technique for the reconstruction of full-thickness defects of the ala nasi. To achieve the best surgical outcomes, it is essential to have an exhaustive knowledge of the vascular network to improve the management of the surgical flap. This study aimed to provide an anatomical and surgical guide for a well-designed reconstruction of the ala nasi using a free preauricular flap. Methods: In this study, three fresh-frozen and two formalin-fixed human head specimens injected with red silicone rubber to enhance the arterial facial system were used. The reconstruction of the full-thickness defect of the ala nasi was performed using a microsurgical auricular flap technique, with the dimensions of the ala nasi and the preauricular flap duly noted. In addition, anatomical dissections were conducted, during which the positions and diameters of the main donor and recipient vessels were measured. Results: A presurgical evaluation was performed to define the flap design. A comparison of the shape and mean dimensions of the ala nasi defect (height 9.66 ± 1.40 mm; thickness 3.52 ± 0.53 mm) and the preauricular flap (height 8.50 ± 2.68 mm; thickness 3.92 ± 1.29 mm) indicated that this flap was an optimal option for the reconstruction of the ala nasi. The surgical procedure involved the full-thickness removal of the ala nasi, and the harvesting and insertion of the preauricular flap. The anatomical measurements demonstrated that the facial artery and veins were the optimal recipient vessels, with a diameter of &gt;1 mm (2.08 ± 0.56 and 2.85 ± 0.74 mm), suitable for anastomosis with the superficial temporal artery and vein (1.86 ± 0.58 and 1.66 ± 0.15 mm). In addition, the postsurgical evaluations indicated a slight mean difference in the thickness (1.14 ± 0.65 mm) and height (1.68 ± 1.18 mm) between the ala nasi and helix and a satisfactory VAS score (7.9 ± 0.57). Conclusions: Our surgical and anatomical data provide compelling evidence in favour of free preauricular flap reconstructions of the ala nasi. This procedure allows for the correct choice of recipient vessels and the creation of a well-designed surgical flap.

Assessment of Healthcare Professionals' Knowledge and Practices About Radioactive Iodine Preparation in Thyroid Cancer Patients.

Background Radioactive iodine (iodine-131) therapy is widely used for treating thyroid cancer. However, the knowledge and practices of healthcare professionals in preparing patients for radioactive iodine therapy may vary, potentially affecting patient outcomes. Objective This study aimed to evaluate the knowledge and practices of healthcare professionals at King Abdulaziz Medical City (KAMC) in Jeddah, regarding the preparation of patients with thyroid cancer for radioactive iodine therapy. Methodology A cross-sectional study was conducted using an electronic survey distributed to endocrinology consultants, fellows, medical residents, radiologists, nuclear medicine technicians, and nurses at KAMC. The survey assessed participants' knowledge and practices related to radioactive iodine preparation. Using JMP 17 database software (JMP, Cary, NC), descriptive and inferential statistical analyses were performedand qualitative data were analyzed thematically. Results The study included 30 participants, half of whom had five years of experience or less (43.33%, n=13). More than half of the respondents reported involvement in the administration of iodine-131 (56.67%, n=17). Only around half the participants correctly identified certain aspects, such as the need for recombinant humanthyroid stimulating hormone (TSH)prior to iodine therapy (56.67%, n=17), adherence to a low-iodine diet (43.33%, n=13), screening female patients for pregnancy (76.67%, n=23), the duration for which women should avoid pregnancy (56.67%, n=17) and patient education on the side effects and distance precautions when sleeping with others (48%, n=12). The study found a significant association between involvement in the administration or supervision of iodine-131 and knowledge of the necessary medication prior to treatment (p=0.0431 for correct choice and p=0.0117 for correct dosage). Conclusion The study revealed knowledge gaps among healthcare professionals at KAMC regarding the preparation of patients with thyroid cancer for radioactive iodine therapy. It emphasizes the need for educational and training initiatives to improve healthcare professionals' knowledge and awareness in this area. Addressing these knowledge gaps can enhance patient safety and optimize the effectiveness of radioactive iodine therapy.

Attentional processing in the rat dorsal posterior parietal cortex

The human posterior parietal cortex (PPC) is known to support sustained attention. Specifically, top-down attention is generally processed in dorsal regions while bottom-up regulation occurs more ventrally. In rodent models, however, it is still unclear whether the PPC is required for sustained attention, or whether there is a similar functional dissociation between anatomical regions. Consequently, the aim of this study was to investigate the contribution of the rodent dorsal PPC (dPPC) in sustained attention. We used the five-choice serial reaction time task (5CSRTT) and compared rats with neurotoxic dPPC lesions to sham operated rats. We found that rats with dPPC lesions were less accurate and took longer to make correct choices, indicating impaired attention and reduced processing speed. This effect, however, was limited to the first few days of post-operative testing. After an apparent recovery, omissions became elevated in the lesion group, which, in the absence of reduced motivation and mobility, can also be interpreted as impaired attention. In subsequent challenge probes, the lesion group displayed globally elevated latency to make a correct response, indicating reduced processing speed. No differences in premature responses or perseverative responses were observed at any time, demonstrating that dPPC lesions did not affect impulsivity and compulsivity. This pattern of behavior suggests that while intact dPPC supports goal-driven (top-down) modulation of attention, it likely does not play a central role in processing stimulus-driven (bottom-up) attention. Furthermore, compensatory mechanisms can support sustained attention in the absence of a fully functioning dPPC, although this occurs at the expense of processing speed. Our results inform the literature by confirming that rodent PPC is involved in regulating sustained attention and providing preliminary evidence for a functional dissociation between top-down and bottom-up attentional processing.

Text Analysis of the System of Changing Majors in Chinese Universities

The major, as the most basic unit for cultivating talents, has always been a subject of public concern. The choice of major affects the effectiveness of talent cultivation, and the correct choice of major is one of the key factors affecting the level of study commitment and state, as well as the student's college experience and the quality of undergraduate education. It is crucial to pay close attention to the adjustment and conversion of majors for students who are dissatisfied with their majors after entering a university. This paper lists the theoretical basis for major transfer, describes the development of relevant major regulations in China, and analyzes the implementation regulations of five randomly selected universities, it raises issues and provides relevant suggestions.

Immunological indicators of the risk of the transition from chronic gastritis to gastric ulcer in adolescents

As is known, gastric ulcer (GCC) and duodenal ulcer (duodenal ulcer) are chronic, complex-etiology diseases, the mechanism of which is based on complex transformations of nervous, hypothalamic-pituitary, hypothalamic-pituitary-adrenal and local gastroduodenal processes that lead to a change in trophism in the mucous membrane of the stomach and duodenum. In turn, the incipient ulcerative defect is a source of irritation of the enteric receptors, supporting disorders of neurohormonal regulation. Thus, the resulting “vicious circle” causes the chronic course of peptic ulcer disease. During the study of chronic diseases of gastroduodenal localization, including peptic ulcer disease, many doctrines of its occurrence have been proposed. However, the issue of the origin of peptic ulcer disease still remains insufficiently studied; approaches and tactics for managing patients with erosive and ulcerative lesions of the upper gastrointestinal tract are being developed. The aim of the study was to evaluate immunological indicators that determine the risk of chronic gastritis turning into gastric ulcer. The study included 120 children aged 14-17 years, permanently residing in the Bukhara region of the Republic of Uzbekistan. Taking into account the importance of H. Pylori in the development of HCG, patients were distributed depending on the association of HCG with H. Pylori. To study cytokines, blood tests of patients were performed to determine the titer of antibodies (IgG and IdM) to H. Pylori, immunoglobulins A, M, G in blood serum, secretory IgA in oral fluid, IL-1β, IL-10, TNFα, VEGF in the serum of patients. At the same time, blood sampling was carried out in the periods before and 3 weeks (21 days) after treatment. Thus, the study of the value of immunological blood parameters in the progression of HCG to gastric ulcer disease dictates the need to develop immunological indicators for predicting the progression of HCG to gastric ulcer in adolescents. An increase in TNFα levels indicates a high risk of developing gastric ulcer as a result of vascular damage and impaired local circulation. In the study, an established increase in the level of IL-1β indicates activation of the synthesis of proinflammatory cytokines in HCG, especially in HCG associated with H. Pylori. The use of these recommendations contributes to the monitoring of HCG, improving the effectiveness of diagnosis and the correct choice of treatment for patients with HCG, reducing mortality and disability at the same time.

Use of neuronavigation technologies for severe forms of scoliosis in children

Background. The method of choice for surgical correction of scoliosis is the technology of three-dimensional polysegmental fixation according to Cotrel–Dubousset. Its use is associated with inherent difficulties and risks, often associated with malposition of supporting elements, as well as the risk of complications. The incidence of neurological complications during surgical correction of scoliosis can reach 7%. High risks, including irreversible complications, of surgical correction of scoliosis dictate the need to introduce modern safety methods, including O-arm navigation and intraoperative neuromonitoring (IONM). Aim. Increasing the effectiveness and safety of surgical correction of scoliosis in children using O-arm navigation and IONM. Materials and methods. 136 patients operated on for scoliosis were observed. The patients were divided into 2 groups: group 1 included patients operated on using the “free-hand” technology (a total of 609 screws were analyzed in 30 patients); group 2 included patients operated on using O-arm navigation and IONM (524 screws in 25 patients). The average Cobb angle of deformation was 66.9±28.1° in group I and 82.4±25.8° in group 2. Malpositions were assessed using the classification of G. Rao et al. (2002), and an analysis of neurological complications was also carried out in 69 patients in group 1, and in 67 patients in group 2. Results. In group 1, the overall incidence of malpositions was 27.3% (166 out of 609 screws). In group 2, it was 10.5% (55 out of 524 screws). In group 1, the frequency of grade 1 malpositions was 3.9% (24 out of 609), grade 2 – 11.8% (72 out of 609), grade 3 – 11.5% (70 out of 609). In 2: grade 1 occurred in 4.2% of cases (22 out of 524), grade 2 – 3.4% (18 out of 524), and grade 3 – 2.9% (15 out of 524). The frequency of medial malpositions in the first group was 7.6% (46 out of 609), in the second group – 2.7% (14 out of 524). Lateral malpositions in the group 1 were 11.7% (71 out of 609), in the group 2 – 4.4% (24 out of 524). Anterior malpositions in group 1 – 8.05% (49 out of 609), in group 2 – 3.2% (17 out of 524). In group 1 there were 3 cases of neurological complications – 4.3%, in group 2 – in 1 case – 1.4%. Conclusion. O-arm navigation and IONM made it possible to reduce the frequency of malpositions, and there was also a tendency to reduce the number of neurological complications in the group of patients where IONM and O-arm navigation were used.

Unusual Composition of the Sarezzano Reliquary Busts

The interdisciplinary study of two reliquary busts from Sarezzano (Piedmont, Italy) is a perfect example of the necessity to provide for material characterisation as a recurring common practice in historical studies and a mandatory step in conservation assessment. Furthermore, the diagnostics of cultural heritage play a crucial role in art historical research, providing relevant information on artefacts’ genesis, production technology, and conservation history. The study of the materials of the reliquary busts was performed by non-invasive (portable X-ray fluorescence spectrometry) and micro-invasive (stereomicroscope, attenuated total reflection Fourier transform infrared spectroscopy and powder X-ray diffraction analysis) methods. According to the results, the busts were found to be made of a tin–lead alloy, a rather unusual material for mediaeval reliquary busts. Moreover, the outcome suggests that the busts were originally silvered, except for the hair and beard which are still gilded. The analysis reveals the use of colophony as an adhesive buffer layer on the busts’ alloy, as well as inside them, to favour the metal working process, since it is found as degraded residue. Finally, even the typology of alloy decay is defined. All this information has enabled us to determine the artistic technique and estimate the value and quality of the material employed. In addition, it has led to the correct choice of materials and methods to be adopted during the restoration, and therefore the usage of more suitable solvents and tools.

Multi-objective optimization algorithms for building performance assessment – A benchmark

The increasing development in the computational field that allowed software and hardware advances enables more refined building performance analysis. Simulation-based optimization (SBO) methods allow high standards to be achieved by combining parametric modeling, simulation, and optimization methods. However, SBO methods still need development, especially regarding the correct choice of the optimization algorithm based on the specific characteristics of each problem. This study proposes a multi-objective optimization algorithms benchmark by comparing seven multi-objective optimization algorithms: RBFMOpt, NSGA2, MHACO, NSPSO, MOEA/D, HypE, and SPEA2, across nine building-related problems, including thermal, energy, and daylight simulation. The problems varied from 5 to 18 discrete, continuous, and mixed parameters. The objective functions varied between two and three. We used the hypervolume indicator, IGD+, GD+, and EPS + to compare algorithms’ performance and assess the tendency to reduce computational costs. We also performed the Kruskal-Wallis non-parametric test to analyze the impact of multiple runs on the hypervolume indicator. The results showed that RBFMOpt and HypE perform best across all problems. However, RBFMOpt tends to reduce computational costs since the algorithm requires fewer simulations to obtain the best results.

КЕРУВАННЯ ДИНАМІКОЮ ІМПУЛЬСНОГО ПЕРЕТВОРЮВАЧА З М’ЯКИМ ПЕРЕМИКАННЯМ, ЩО ПРАЦЮЄ НА ДУГОВЕ НАВАНТАЖЕННЯ

Issues of design and research of energy-efficient and reliable semiconductor DC voltage converters for wide application in power supply devices of arc plasmatrons used in plasma metal cutting installations are considered. An estimated structural dynamic model of a soft-switching DC converter with a closed-loop control system combining the power part and the control system, intended for use as part of the latter as a digital module, was built. A technique is proposed and methods of controlling the converter are found, which provide the specified duration of transient processes, the permissible value of load current pulsations in a quasi-steady mode and the astatism of the output current, which confirms the correctness of the proposed technique. A prototype of a pulse stabilizer with digital control was made. The results of experimental studies of the sample confirm the effectiveness of the developed control device, namely the achievement of the specified duration of transient processes caused by a step change in the load current, close to 10-12 periods of conversion and astatism of the output current. It is shown that the application of a pulse stabilizer, in which a digital control loop is used, has significant advantages compared to analog options and has the advantages of a strategic plan. The use of combined control allows you to significantly reduce the requirements for the overall gain of the main control channel, which greatly facilitates the choice of sequential digital correction. Research results may be of interest to specialists in the field of power electronics, power supply systems of autonomous objects and control systems. References 14, figures 11. Key words: automatic control system, digital controller, external disturbance, plasma, robustness, optimization.

Asthmatic status in pediatric practice in patients with mild bronchial asthma

The main principle of the treatment of bronchial asthma is rational basic therapy, with priority appointment of inhaled glucocorticosteroids. The basis of the effectiveness of treatment is determined by the correct choice of the form of drug delivery, training the patient in inhalation skills and constant monitoring of the correct use of the inhaler. The article demonstrates the clinical observation of the formation of asthmatic status in a child with mild bronchial asthma. The deterioration of the condition and severe exacerbation was caused by insufficient intake of basic therapy funds into the respiratory tract due to improper inhalation techniques due to the patient's lack of skills in using an inhaler. At the same time, the patient was not trained and the necessary control over the correctness of the inhalation technique was not carried out at the outpatient stage.

Simulation Design and Research of Flame Generation in Virtual Fire Scene Based on Unity3D

Since the 21st century, with the continuous development and progress of science and technology, the possibility of fire danger is also rising, the requirements of public fire safety management have also been improved accordingly, and the problems in its fire safety management work make it difficult to meet the management requirements. The selection of firefighters has also become the top priority of management, good psychological quality of firefighters can keep calm in the face of fire explosions and various emergencies, and can make the most correct choice to complete the rescue and fire fighting work. In this paper, a building in a certain location is selected as the location to simulate the scene of fire. Through human-computer interaction to judge the psychological quality of firefighters. First use major modeling software such as 3ds Max, Adobe Fusecc, or find material in the Unity3D store to create models of fire scenes and people and import them into Unity3D. Using Unity3D's own particle system component to build flame models, adding collision body components to all models to detect their collision detection mechanism and the mechanism of flame spreading combustion. A Scenario-based Communication Ability Evaluation System Based on Traditional Cognitive Behavior Measurement and Advanced Eye Movement, EEG and NIR Acquisition Techniques.