scholarly journals Development of a simulation model of a photoplethysmographic signal under psychoemotional stress

2021 ◽  
Vol 2 (9 (110)) ◽  
pp. 36-45
Author(s):  
Evhenia Yavorska ◽  
Oksana Strembitska ◽  
Michael Strembitskyi ◽  
Iryna Pankiv
Keyword(s):  
Stress Response ◽  
Simulation Model ◽  
Harmonic Functions ◽  
Response Curve ◽  
Signal Frequency ◽  
Random Component ◽  
Time Intervals ◽  
Biological Origin ◽  
Psychoemotional Stress ◽  
Student’S T

A simulation model of a photoplethysmographic signal under psychoemotional stress taking into account the nature of signals of biological origin and stress response stages was developed. The method of constructing the simulation model is based on reconstructing the waveform and coding points of the signal taking into account the stress response curve using harmonic functions at characteristic time intervals. Using the simulation model of the photoplethysmographic signal under psychoemotional stress with previously known parameters allows validation of methods and algorithms for processing such data. It was found that in the process of simulation, it is necessary to take into account the signal frequency, random component and stress response curve. This complicates the simulation algorithm. However, using the simulation model with variable input parameters allows reproducing the signal with an emphasis on stress response stages. One of the features of the proposed model is the ability to reproduce the signal by coding points for amplitude and time intervals using harmonic functions. The relative error for the amplitude variation of the model and experimental data is 3.97 %, and for the period – 3.41 %. Calculation of Student's t-test showed a statistically insignificant difference: p=0.296 for the amplitude and p=0.275 for the period. This indicates that the simulation model takes into account the signal characteristics under stress: frequency, random component and stress response curve. Using the proposed simulation model is an adequate way to assess methods and algorithms for analyzing the state of the cardiovascular system under psychoemotional stress

New Algorithm of Response Curve for Fitting HDR Image

2019 ◽  
Vol 34 (01) ◽  
pp. 2054001 ◽  
Author(s):  
Shi Qiu ◽  
Xuemei Li ◽  
Yongdong Huang ◽  
Zhengzhou Li ◽  
Xun Chen ◽  
...  
Keyword(s):  
Response Curve ◽  
Image Sequences ◽  
Response Curves ◽  
Time Intervals ◽  
Optimal Response ◽  
Fitting Method ◽  
Fitting Algorithm ◽  
Texture Characteristics ◽  
Pixel Value ◽  
Hdr Image

Based on the process of generating HDR images from LDR image sequences with different light exposures in the same scene, a new fitting method of camera response curves is proposed to solve the problem that the boundary of the fitting algorithm of camera response curves will be blurred and it is difficult to determine and verify the accuracy of the fitting curves. The optimal response curve is fitted by increasing LDR images step by step through considering the pixel value and texture characteristics. In order to validate the fitting effect of curves, we compare the photographed images and the real images in different time intervals on the basis of HDR images and response curves. We use RGB and gray image experiments to compare the current mainstream algorithms and the accuracy of our proposed algorithm can reach 96%, which has robustness.

scholarly journals PSXI-1 Agent-based simulation model to evaluate the technical performance of reproductive programs in beef cattle

2020 ◽  
Vol 98 (Supplement_4) ◽  
pp. 385-385
Author(s):  
Oscar Alejandro Ojeda-Rojas ◽  
Angela M Gonella-Diaza ◽  
Daniel Bustos Coral ◽  
Gustavo L Sartorello ◽  
Thayla Reijers ◽  
...  
Keyword(s):  
Beef Cattle ◽  
Simulation Model ◽  
Reproductive Strategies ◽  
Scientific Literature ◽  
Agent Based Simulation ◽  
Time Intervals ◽  
Agent Based ◽  
Technical Performance ◽  
Timed Artificial Insemination ◽  
Number Of Births

Abstract A stochastic, agent-based simulation model was created to compare the technical performance of reproductive strategies in beef cattle. The model was parameterized using field data and peer-reviewed scientific literature using AnyLogic software. Ten scenarios were evaluated: natural mating (NM) only (ONM); one timed artificial insemination (TAI) plus NM (1TAI+NM); two TAI plus NM, with 24, 32, and 40 days of interval between TAI (2TAI/24+NM, 2TAI/32+NM, and 2TAI/40+NM, respectively); three TAI without NM, with 24, 32, and 40 days of interval between TAI (3TAI/24, 3TAI/32, and 3TAI/40, respectively), and three TAI plus NM, with an interval between TAIs of 24 (3TAI/24+NM) and 32 days (3TAI/32+NM). The size of the female herd was up to 400 individuals. The bull population was 0, 7, or 15 bulls depending on the scenario used. The outcomes were assessed on 320 farms, using a 5,000-day time horizon at one-day time intervals and an animal-by-animal basis. The 3TAI/24+NM resulted in a higher number of births (293 births) and weaned calves (287 calves), while the ONM had the lowest number of births (207 births) as well as weaned calves (203 calves). The heaviest and lightest males at weaning belong to the 3TAI/24 (190.58 ± 0.77 kg) and ONM (166.59 ± 0.93 kg), respectively. The total pregnancy rate was highest in 3TAI/24+NM (0.90 ± 0.00) and lowest for ONM (0.61 ± 0.01). The ONM reach 50% of pregnancy 52.5 days longer when compared to the scenarios that included TAI. Our model accurately represents the main interactions of a real beef cattle herd, with all the advantages of a physical experiment without incurring significant money expenses or alterations to the system. This study suggests that scenarios with three TAI accompanied by early pregnancy diagnosis presented better technical performance and produced more and heavier calves.

scholarly journals Research on Dynamic Characteristics of Constant Power Control of Plunger Pump Variable Regulator

2021 ◽  
Vol 2132 (1) ◽  
pp. 012052
Author(s):  
Haoming Dong ◽  
Xiajie Jin ◽  
Keli Xing
Keyword(s):  
Power Control ◽  
Simulation Model ◽  
Dynamic Characteristics ◽  
Response Curve ◽  
Simulation Software ◽  
Physical Parameters ◽  
Matlab Simulation ◽  
Constant Power ◽  
Plunger Pump ◽  
Dynamic Motion

Abstract This article takes K3VDT63 variable plunger pump original regulator as the research object, establishes its dynamic motion equation, uses matlab simulation software to establish its simulation model on the basis of this equation, and the dynamic characteristics of the simulation model under different physical parameters Experiment, and get the dynamic response curve and result of variable regulator constant power control under the influence of various factors.

scholarly journals Influence of Time Intervals between Bleaching Procedures on Enamel Microhardness and Surface Roughness

2018 ◽  
Vol 12 (1) ◽  
pp. 555-559 ◽  
Author(s):  
Roberta Pimentel de Oliveira ◽  
Juliana Costa Pereira Baia ◽  
Mara Eliane Soares Ribeiro ◽  
Mario Honorato da Silva e Souza Junior ◽  
Sandro Cordeiro Loretto
Keyword(s):  
Surface Roughness ◽  
Artificial Saliva ◽  
Dental Enamel ◽  
Time Interval ◽  
Time Intervals ◽  
Dental Bleaching ◽  
Dental Aesthetics ◽  
Student’S T ◽  
Dependent Samples ◽  
Student’S T Test

Background:Dental bleaching has been increasingly sought out to improve dental aesthetics, but it may cause changes in dental enamel.Objective:To assess the influence of different time intervals on bleaching gel applications with regard to the Microhardness (MH) and Surface Roughness (SR) on dental enamel.Material and Methods:Forty bovine incisors were randomly divided into two groups (G1 and G2) and both were bleached with 35% Hydrogen Peroxide (HP35) (n=20; G1: seven-day interval and G2: two-day interval). The MH and SR tests were performed before bleaching (T0) and after the first (T1), second (T2), and third (T3) bleaching gel applications. The specimens were stored in artificial saliva between each application (37°C). The data were analyzed using the student’s t-test (p≤ 0.05) for dependent samples.Results:The reduced time interval (two days) led to a significant reduction in MH, while MH was not affected during the seven-day interval. The SR results increased regardless of the bleaching gel application time interval.Conclusion:The decreased time interval of two days between bleaching gel applications caused changes in MH but did not influence the SR of dental enamel.

Management of material working capital of poultry farms

2018 ◽  
Author(s):  
Наталья Алексеева ◽  
Natalya Alekseeva ◽  
Руслан Шамсутдинов ◽  
Ruslan Shamsutdinov
Keyword(s):  
Political Economy ◽  
Simulation Model ◽  
Management System ◽  
Technological Development ◽  
Cost Savings ◽  
Effective Management ◽  
Working Capital ◽  
Biological Origin ◽  
Poultry Farms ◽  
Theoretical Foundations

The monograph describes the features of organizational and technological development of poultry sub-complex of agriculture and their impact on the working capital of poultry farms. Studied the economic substance of the material circulating assets of factory farms from the standpoint of political economy, accounting, analytical, logistical approaches, methodological tools of management from the standpoint of simulation of business situations. Considers the theoretical foundations of effective management of the physical working capital of the farms. The tendencies of development of circulating assets of poultry farms, including elements of biological origin, are formulated. As a result, the provisions of the concept of bio-objective functionalism of the management system of material circulating assets of poultry farms are formulated, a simulation model and organizational and economic mechanism of management of material circulating assets of poultry farms are developed. The strategies of management of material working capital, which contribute to cost savings by preventing the creation of excess stocks, increase the profitability of working capital, increase the profitability of the final product.

An in vivo study to record bite force until denture dislodgement of an existing and new maxillary denture with and without use of denture adhesive

2018 ◽  
Vol 10 (1) ◽  
pp. 6-12
Author(s):  
Chandrakala .V ◽  
Nandeeshawar. D.B
Keyword(s):  
P Value ◽  
Complete Dentures ◽  
Time Intervals ◽  
Denture Adhesive ◽  
Group I ◽  
Comparison Results ◽  
Denture Adhesives ◽  
Student’S T ◽  
Student’S T Test

OBJECTIVES: Thoughadequate retention is a basic requirement, there are situations in which it is not possible to obtain desirable optimal retention. Because of ill effects to supporting tissues due to many mechanical aids for retention, many patients frequently resort to the use of denture adhesives. Due to technique sensitivity and limitations of many techniques to measure the retention of a complete denture, this study was planned to evaluate and compare the BFDD with the following aims and objectives; • To measure BFDD in an existing denture without and with use of denture adhesive. • To measure BFDD in new denture without and with use of denture adhesive. • To compare BFDD between an existing and new denture without and with use of denture adhesive. METHODOLGY: Among total of twenty edentulous subjects, Group I& Group II for Method A & B were made. The data obtained by BFDD measurements were statistically analyzed using ANOVA for different time intervals and student’s t-test for group wise comparison. RESULTS AND CONCLUSION: The results of the study showed that consistent improvements were observed in BFDD when adhesive was used. The p-value was highly significant (p<0.001 HS) at all time intervals for both existing and new set of complete dentures.

scholarly journals Change in platelet count in patients with hypersplenism subjected to liver transplantation

2011 ◽  
Vol 48 (3) ◽  
pp. 175-178 ◽  
Author(s):  
Júlio Cezar Uili Coelho ◽  
Priscilla Balbinot ◽  
Rodrigo Nitsche ◽  
Kátia Aparecida Pinto ◽  
Mônica Beatriz Parolin ◽  
...  
Keyword(s):  
Liver Transplantation ◽  
Platelet Count ◽  
Meld Score ◽  
Time Intervals ◽  
Chi Square ◽  
Study Protocols ◽  
Explanted Liver ◽  
Chi Square Test ◽  
Pugh Class ◽  
Student’S T

CONTEXT: Most patients subjected to liver transplantation presents hypersplenism, which is reversed after the operation. However, some patients remain with moderate to intense hypersplenism. OBJECTIVES: To study the effect of liver transplantation on platelet count in patients with hypersplenism. METHOD: Of a total of 233 patients who underwent liver transplantation, 162 were excluded from the present study because of occurrence of steroid-resistant rejection, absence of hypersplenism before the transplantation, absence of follow-up for at least 2 years or incomplete exams data. The electronic study protocols of the remaining 71 patients were reviewed to determine the demographics, etiology of cirrhosis, and results of pathologic examination of the explanted liver. Serial platelet count was obtained from the study protocol on the day before liver transplantation and 1, 2, 4, and 6 months and 1 year after liver transplantation. Statistical analysis was performed using the Student's t-test, chi-square test, and Spearman's correlation test. RESULTS: Posttransplant platelet count at all time intervals was significantly higher than the pretransplant value (P<0.001 for all time intervals). Thrombocytopenia was reversed (platelet count >100,000/mm³) in 58 patients (81.7%) 1 month after liver transplantation. Twelve patients (16.9%) remained with thrombocytopenia 1 year after liver transplantation. Three patients (4.2%) had recurrence of thrombocytopenia within 1 year after liver transplantation. There was no correlation between pretransplant platelet count and the Child-Pugh class or the MELD score. CONCLUSION: Liver transplantation reverses hypersplenism in most patients.

Comparative Paleoecology of Fossils and Fossil Assemblages

2008 ◽  
Vol 14 ◽  
pp. 289-317 ◽  
Author(s):  
Andrew M. Bush ◽  
Gwen M. Daley
Keyword(s):  
Environmental Control ◽  
Ecological Factors ◽  
Data Sets ◽  
Random Component ◽  
Time Intervals ◽  
Assemblage Composition ◽  
Ordination Techniques ◽  
Fossil Assemblages ◽  
The Many ◽  
Molluscan Assemblage

Generating and testing hypotheses is an integral part of any science, and some of the most stimulating paleobiological hypotheses of the past few decades relate to the ecological properties of fossils or fossil assemblages. Here, we outline recent methods for framing paleoecological questions that should facilitate the further quantitative evaluation of paleoecological hypotheses. First, we describe theoretical ecospaces, which are frameworks for classifying the ecologic properties of individuals or species based on multiple characters. We discuss the utility of theoretical ecospace in understanding evolutionary constraints and biodiversification, among other topics. Second, we discuss the reconstruction of high-resolution paleoecological gradients using ecological ordination techniques. Ordination can help uncover the paleoenvironmental factors that controlled fossil assemblage composition, track these factors through time, and evaluate the environmental and ecological context of major biotic changes. As an example, we present a new gradient analysis of the Yorktown Formation (Pliocene) of Virginia in which substrate and disturbance controlled molluscan assemblage composition. As a further example, we ordinate samples of mid-Paleozoic and late Cenozoic marine fossil assemblages based on their ecological content (as determined using a theoretical ecospace) to test whether the same environmental and ecological factors controlled the distribution of ecological lifestyles in both time intervals, despite the many differences between them. Although depth-related variation is evident in both data sets, the Cenozoic samples show stronger evidence of environmental control on ecologic content within depth zones. In contrast, Paleozoic gradients are consistent with a more random component in assemblage content. These analyses are quite preliminary, however, and should be verified with more extensive data.

PSVIII-11 Agent-based simulation model to evaluate the economic performance of reproductive programs in beef cattle

2021 ◽  
Vol 99 (Supplement_3) ◽  
pp. 428-429
Author(s):  
Oscar A Ojeda-Rojas ◽  
Angela Maria M Gonella-Diaza ◽  
Gustavo L Sartorello ◽  
Augusto H Hauber Gameiro
Keyword(s):  
Beef Cattle ◽  
Simulation Model ◽  
Economic Performance ◽  
Reproductive Strategies ◽  
Operating Cost ◽  
Agent Based Simulation ◽  
Time Intervals ◽  
Agent Based ◽  
Timed Artificial Insemination ◽  
Using Data

Abstract The objective of this study was to create a stochastic, agent-based simulation model to compare the economic performance of reproductive strategies in beef cattle. The model was parameterized using data from a real herd and the scientific literature. The scenarios evaluated were: natural mating (NM) only (ONM); one timed artificial insemination (TAI) plus NM (1TAI+NM); two TAI plus NM, with 24, 32, and 40 days between TAI (2TAI/24+NM, 2TAI/32+NM, and 2TAI/40+NM, respectively); three TAI without NM, with 24, 32, and 40 days (3TAI/24, 3TAI/32, and 3TAI/40, respectively), and three TAI plus NM, with 24 and 32 days (3TAI/24+NM and 3TAI/32+NM, respectively). The initial female herd was 400 and remained constant. The bull population varies from 0 to 15, depending on the scenario. The outcomes for each scenario are assessed on 32 farms, using a 5000-day time horizon at one-day time intervals and an animal-by-animal basis. The 3TAI/24+NM scenario resulted in the highest incomes (US$ 96,479.2 ± 709.8), while ONM had the least value (US$ 79,753.4 ± 741.9). The total operating cost was highest for 3TAI/24+NM (US$ 101,720.6 ± 79.2) and lowest for ONM (US$ 90,898.6 ± 59.2). However, when the total operating cost was evaluated per kg of weaned calf, the highest and lowest costs were for ONM (US$ 2.8 ± 0.0/kg) and 2TAI/24+NM (US$ 2.17 ± 0.0/kg), respectively. The 2TAI/24+NM (US$ -4,651.3 ± 630.7) scenario presented the best net margin, while the lowest result was for 3TAI/40 (US$ -12,590.0 ± 746.3). Our model suggests that reproductive strategies that use TAI have better economic performance than those under ONM. However, when three TAI were performed with 40 days, the benefit was lower, and even for some analyzes, it was worse than the ONM. The 2TAI/24+NM scenario outperformed the others because of the contrast between its high income with moderate costs.

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