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Found 6341 publications
Field-grown tomato yield estimation using point cloud segmentation with 3D shaping and RGB pictures from a field robot and digital single lens reflex cameras
Publication Name: Heliyon
Publication Date: 2024-10-30
Volume: 10
Issue: 20
Page Range: Unknown
Description:
The aim of this study was to estimate field-grown tomato yield (weight) and quantity of tomatoes using a self-developed robot and digital single lens reflex (DSLR) camera pictures. The authors suggest a new approach to predicting tomato yield that is based on images taken in the field, 3D scanning, and shape. Field pictures were used for tomato segmentation to determine the ripeness of the crop. A convolution neural network (CNN) model using TensorFlow library was devised for the segmentation of tomato berries along with a small robot, which had a 59.3 % F1 score. To enhance the accurate tomato crop model and to estimate the yield later, point cloud imaging was applied using a Ciclops 3D scanner. The best fitting sphere model was generated using the 3D model. The most optimal model was the 3D model, which gave the best representation and provided the weight of the tomatoes with a relative error of 21.90 % and a standard deviation of 17.9665 %. The results indicate a consistent object-based classification of the tomato crop above the plant/row level with an accuracy of 55.33 %, which is better than in-row sampling (images taken by the robot). By comparing the measured and estimated yield, the average difference for DSLR camera images was more favorable at 3.42 kg.
Open Access: Yes
Health status of Hungarian ambulance workers in the COVID-19 era
Publication Name: Orvosi Hetilap
Publication Date: 2024-10-27
Volume: 165
Issue: 43
Page Range: 1707-1713
Description:
Objective: The study aimed to assess the physical and mental health status of active ambulance workers concerning the additional workload they are facing due to the coronavirus pandemic. Data and methods: A cross-sectional survey was conducted with 130 Hungarian National Ambulance Service em¬ployees (n = 130) in the first quarter of 2023, using an online questionnaire on a voluntary, anonymous basis. After convenience sampling, physical and mental health were assessed using the SF-36 questionnaire, along with questions on musculoskeletal status and experience of the COVID-19 pandemic. SPSS was used for data analysis, with descrip¬tive and mathematical statistical tests. The results were significant at p<0.05. Results: The ambulance workers considered their "Physical functioning"to be the best (mean 90.7 ± 13.2 points) and their "General health"to be the worst (55.4 ± 9.5 points). The dimensions were correlated (p<0.001). 73.1% of the sample had a musculoskeletal complaint in the last 5 years, with the highest proportions in the back area (56.8%) and spine (51.5%). These ambulance workers rated their "Physical Functioning"significantly worse (p = 0.002). 95 persons were registered as COVID-19-infected, 50% of whom were only slightly or not at all affected by the pandemic (mean 2.6 ± 1.2). The experience of the coronavirus had a negative impact on the dimensions "Vitality"(r = -0.204, p = 0.020), "Emotional role"(r = -0.317, p<0.001) and "Mental health"(r = -0.283, p = 0.001). Persons with residual symptoms of COVID-19 rated their "Physical functioning"(p = 0.015), "Physical pain"(p = 0.010), "Social functioning"(p = 0.001), and "Mental health"(p = 0.023) dimensions worse. Conclusion: The sudden increase in workload caused by the pandemic makes it essential to monitor ambulance work¬ers' health closely. Residual symptoms of the coronavirus and concomitant musculoskeletal disorders can compro¬mise the quality of patient care.
Open Access: Yes
Change of total body water dependent on age and nutritional status
Publication Name: Orvosi Hetilap
Publication Date: 2024-10-27
Volume: 165
Issue: 43
Page Range: 1694-1699
Description:
Introduction: A healthy fluid balance is necessary to maintain normal vital functions. Detecting the amount of body water is important both in clinical practice and in sports in assessing dehydration and/or fluid overload. Among the methods used to determine the amount and distribution of body water, devices operating on the principle of bioelectrical impedance are becoming more common. Their use is simple, fast and the results obtained are reliable. Objective: The aim of our study was to determine the relative body water content changing dependent on age in men and women of normal weight, overweight and obese, using a device that works on the principle of bioelectrical im¬pedance. Method: The data of a total of 2,354 persons between the ages of 7 and 81 are included in the study conducted with the InBody 720 type device. Normal body weight, overweight and obesity were determined using the body mass index. Results: There were significant differences between gender in body weight, body mass index between normal weight and overweight/obese participants in all age groups. The differences between relative body water content of men and women in normal body weight are significant in all age groups. The averages have not changed until the 3rd age group (21-50 years), then decreased in the 4th age group (above 51 years) in the normal body weight men. In thecase of normal body weight women, the averages decreased linearly dependent on age. The relative body water con¬tents in overweight/obese subjects were significantly lower by gender and age group than the averages of those with normal body weight. The relative water contents in overweight/obese men and women have not changed dependent on age. Discussion: Although bioelectrical impedance method is less commonly used, it is suitable for measuring total body water content. The reliability of the data obtained by the method is confirmed by more and more studies in the case of people of normal body weight, overweight and obese people as well. Conclusion: The bioelectrical impedance procedure can help prognosis and diagnosis in many areas. After presenting our data, we hope that our study will contribute to the spread of the bioelectrical impedance method.
Open Access: Yes
Public perception of autonomous vehicles acceptance in Hungary
Publication Name: International Review of Applied Sciences and Engineering
Publication Date: 2024-10-25
Volume: 15
Issue: 3
Page Range: 435-447
Description:
The integration of Autonomous Vehicles (AVs) into our modern society hinges on gaining widespread acceptance from potential road users. To indicate the preparedness of these road users and elucidate their perspectives regarding the use of AVs in future, it is imperative to conduct surveys gauging public acceptance and satisfaction with this emerging mode of transportation. This paper reports the results of a comprehensive questionnaire study involving 1,000 individuals in Gyor City. The survey's primary objective was to assess participants' attitudes and willingness to embrace autonomous vehicles within the city's road networks. The study delved into various socio-demographic factors, such as age, gender, and employment status, while also exploring participants' prior knowledge and opinions regarding the advantages and limitations of AVs. The findings reveal a generally favorable disposition among the public toward the inclusion of AVs in urban traffic, paving the way for the acceptance of mixed traffic patterns. Notably, respondents in younger age groups exhibit greater enthusiasm for incorporating AVs into their daily transportation, whereas individuals aged 65 and above express more reservations, displaying a conservative outlook. Furthermore, participants with prior knowledge and a deeper understanding of AVs exhibit a markedly more positive inclination toward this emerging technology compared to those lacking such familiarity.
Open Access: Yes
Local and catchment-scale effects of water retention measures at Lake Velence
Publication Name: Pollack Periodica
Publication Date: 2024-10-16
Volume: 19
Issue: 3
Page Range: 74-80
Description:
Climate change manifested its adverse impacts last year, with an extreme drought leading to a drastically low water level in Lake Velence, Hungary. Nature-based solutions have the potential to alleviate these impacts locally. While a few initiatives have been implemented in Hungary, widespread adoption of these solutions is expected to be a goal for the more distant future. This research focuses on one catchment at Lake Velence to evaluate decision-maker's readiness and urban water management infrastructure for broadly implementing nature-based solutions. Methods include delineating the stormwater system and creating a numerical model to evaluate rainfall-runoff processes and the possible impacts of nature-based retentions. Surveys among local mayors were conducted to assess their perception of existing water infrastructures and implementations of nature-based solutions. Its widespread use may become significant, but its effect on the lake's water level remains negligible.
Open Access: Yes
Development of a multibody model for go-karts considering frame flexibility
Publication Name: Pollack Periodica
Publication Date: 2024-10-16
Volume: 19
Issue: 3
Page Range: 66-73
Description:
This study focuses on the optimization dynamics of racing go-karts, which is heavily influenced by the frame's stiffness. Lacking suspensions and differentials, go-karts rely on the frame stiffness for wheel balancing and skid prevention by lifting the inner rear wheel during turns. Utilizing a rigid-flexible model in MSC Software ADAMS View, validated by frame deformation measurements, this research integrates finite element analysis with multibody techniques. The model, leverages computer aided design files for frame geometry and employs finite element analysis for frame validation. It facilitates evaluating go-kart dynamics through simulations, aiding in maneuver testing and design optimization. This approach provides a comprehensive framework for advancing go-kart designs.
Open Access: Yes
Comparison of different geometry trees in fire simulation
Publication Name: Pollack Periodica
Publication Date: 2024-10-16
Volume: 19
Issue: 3
Page Range: 34-39
Description:
Wildfire simulations can help to better understand the dynamics and effects of forest fires. The basis of wildfire simulation is the tree-burning simulation. In this paper, the fire simulation of 7 different geometry Hungarian trees in the case of arson is presented. It was observed that the trees were burned down fast. The maximum mass loss rate and maximum heat release rate were larger as the tree was larger. The largest intensity fire could be observed in the case of the smallest tree. The maximum temperature was higher in the case of a large crown diameter. The maximum aerosol reached high pollutant concentrations. In the case of large crown height, the maximum CO2 concentration was higher. The results presented in this paper can be the basis of the following forest fire simulations.
Open Access: Yes
Random forest regression on pullout resistance of a pile
Publication Name: Pollack Periodica
Publication Date: 2024-10-16
Volume: 19
Issue: 3
Page Range: 28-33
Description:
This research aims to study the pullout resistance of a helical pile using three methods of machine learning techniques, which are: random forest regression, support vector regression, and adaptive neuro-fuzzy inference system, based on experimental results of a helical pile. The performance of these three techniques has been d compared and the results show that random forest algorithm has best performance than neuro-fuzzy inference system and support vector technique. The results show that machine learning considered a good tool in terms of estimating the pullout resistance of helical piles in the soil.
Open Access: Yes
Changes in primitive reflexes in older adults and their relationship to mental health indices: An experimental investigation
Publication Name: Experimental Gerontology
Publication Date: 2024-10-15
Volume: 196
Issue: Unknown
Page Range: Unknown
Description:
The reemergence of primitive reflexes (PRs) in older age is related to cognitive impairment. Currently, there are no means to prevent or slow their reappearance, but research evidence exists for their control in children. Therefore, this experiment investigated whether a 16-week special sensorimotor exercise program could benefit older adults and whether the intervention-induced changes (if any) may be associated with various indices of mental health. Of 115 adults over 60, 95 completed the study (mean age = 76.37 ± SD = 7.04 years, 22 % men). The experimental group (n = 38) showed an almost threefold decline in PRs compared to controls. In contrast, the control group (n = 57) exhibited a nearly threefold increase in PRs compared to the intervention group. Cognitive function increased in the experimental but not in the control group. Changes in PRs over the 16-week intervention were positively related to negative mental health indices (hopelessness and perceived stress) and negatively related to well-being. These findings suggest that the here-presented mild sensorimotor exercises could affect older adults' reemerging PRs and that changes in PRs are associated with mental health benefits. These results may open new research avenues toward preventing cognitive and psychological decline in older adults.
Open Access: Yes
