scholarly journals Fuzzy Inference System Approach for Locating Series, Shunt, and Simultaneous Series-Shunt Faults in Double Circuit Transmission Lines

2015 ◽  
Vol 2015 ◽  
pp. 1-12 ◽  
Author(s):  
Aleena Swetapadma ◽  
Anamika Yadav
Keyword(s):  
Transmission Lines ◽  
Fault Location ◽  
Fuzzy Inference ◽  
Fault Simulation ◽  
Location Estimation ◽  
Chi Square ◽  
Inference System ◽  
Chi Square Test ◽  
Synchronized Phasors ◽  
Level Of Significance

Many schemes are reported for shunt fault location estimation, but fault location estimation of series or open conductor faults has not been dealt with so far. The existing numerical relays only detect the open conductor (series) fault and give the indication of the faulty phase(s), but they are unable to locate the series fault. The repair crew needs to patrol the complete line to find the location of series fault. In this paper fuzzy based fault detection/classification and location schemes in time domain are proposed for both series faults, shunt faults, and simultaneous series and shunt faults. The fault simulation studies and fault location algorithm have been developed using Matlab/Simulink. Synchronized phasors of voltage and current signals of both the ends of the line have been used as input to the proposed fuzzy based fault location scheme. Percentage of error in location of series fault is within 1% and shunt fault is 5% for all the tested fault cases. Validation of percentage of error in location estimation is done using Chi square test with both 1% and 5% level of significance.

scholarly journals Adaptive neuro-fuzzy inference system based evolving fault locator for double circuit transmission lines

2020 ◽  
Vol 9 (3) ◽  
pp. 448 ◽  
Author(s):  
A Naresh Kumar ◽  
P Sridhar ◽  
T Anil Kumar ◽  
T Ravi Babu ◽  
V Chandra Jagan Mohan
Keyword(s):  
Transmission Line ◽  
Transmission Lines ◽  
Fuzzy Inference System ◽  
Fault Location ◽  
Fuzzy Inference ◽  
Cost Effective ◽  
Inference System ◽  
Protection Method ◽  
Neuro Fuzzy ◽  
Simulation Results

<p>Evolving faults are starting in one phase of circuit and spreading to other phases after some time. There has not been a suitable method for locating evolving faults in double circuit transmission line until now. In this paper, a novel method for locating different types of evolving faults occurring in double circuit transmission line is proposed by considering adaptive neuro-fuzzy inference system. The fundamental current and voltage magnitudes are specified as inputs to the proposed method. The simulation results using MATLAB verify the effectiveness and correctness of the protection method. Simulation results show the robustness of the method against different fault locations, resistances, time intervals, and all evolving fault types. Moreover, the proposed method yields satisfactory performance against percentage errors and fault location line parameters. The proposed method is easy to implement and cost-effective for new and existing double circuit transmission line installation</p>

scholarly journals HANDLING DISTRUST ON RISK COMMUNICATION IN NIGERIA: A STRATEGY TO STRENGTHENING THE COVID-19 OUTBREAK RESPONSE

2021 ◽  
pp. 1-22
Author(s):  
Olayinka Stephen Ilesanmi ◽  
Priscilla Onaopemipo Akosile ◽  
Aanuoluwapo Adeyimika Afolabi ◽  
Victor Okoliko Ukwenya
Keyword(s):  
Risk Communication ◽  
Cross Sectional Study ◽  
Outbreak Response ◽  
Community Members ◽  
Chi Square ◽  
Cross Sectional ◽  
Policy Makers ◽  
Chi Square Test ◽  
Level Of Significance ◽  
High Level

Abstract Background This study aimed to assess the level of trust in the COVID-19 risk communication efforts in Nigeria. Methods We conducted a descriptive cross-sectional study among community members aged 15 years and above in Ondo state in October, 2020. Data were collected using an interviewer-administered questionnaire. Data were analyzed using SPSS version 22. Descriptive statistics were summarized using frequencies. Trust was ranked from “1” implying “Low level of trust” to “7” denoting “High level of trust”. We conducted bivariate Chi-square test on respondents’ level of trust in the Nigeria Centre for Disease Control (NCDC) and socio-demographic characteristics. The level of significance was set at p<0.05. Results Among the 691 respondents, 244 (35.3%) were aged 21 to 29 years, and 304 (51.4%) used the NCDC to obtain COVID-19 knowledge. Overall, 205 (41.8%) had high level of trust in the NCDC. Furthermore, 51 (51.5%) individuals aged 30-39 years had high level of trust in the NCDC (ᵡ2=17.455, p= 0.001). Also, 114 (48.5%) persons who lived with children below 18 years had high level of trust in the NCDC (ᵡ2= 8.266, p= 0.004). Conclusion Policy makers should prioritize the involvement of young and educated persons in COVID-19 risk communication strategies.

scholarly journals The perception of COVID-19 among Italian dental patients: an orthodontic point of view

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Stefano Martina ◽  
Alessandra Amato ◽  
Paolo Faccioni ◽  
Alfredo Iandolo ◽  
Massimo Amato ◽  
...  
Keyword(s):  
Orthodontic Treatment ◽  
Point Of View ◽  
Dental Practice ◽  
Online Questionnaire ◽  
Chi Square ◽  
Dental Patients ◽  
Patient Health ◽  
Chi Square Test ◽  
Orthodontic Patients ◽  
Level Of Significance

Abstract Background The present study aimed to investigate the patients’ perception of the dental practice during the COVID-19 outbreak, and whether the pandemic will affect the attendance of orthodontic patients at the dental practice. An online questionnaire, including the Patient Health Questionnaire-4 (PHQ-4), was submitted to Italian dental patients with items about their perceived risks when going to the dentist, concerns about continuing orthodontic treatment, and the onset of temporomandibular disorders (TMD). Data were analyzed with a chi-square test and logistic regression analysis. The level of significance was set at P < 0.05. Results A total of 1566 subjects completed the survey, including 486 who were under orthodontic treatment or who had a child in orthodontic treatment. A total of 866 participants (55.3%) thought the risk of contracting the COVID-19 infection was higher in a dental practice; this perception was associated with gender (women more than man), age (over 60 years old) and high levels of distress (P<0.001). However, 894 patients (57.1%) felt comfortable going back to the dentist. Most of the orthodontic patients (84%) would continue their treatment. After the lockdown, there was a slight increase in the frequency of TMD pain (356 versus 334). Conclusions Most of the participants believed that the dental practice is a place at greater risk of contracting COVID-19, even if they continue to go to the dentist. Gender, age, and the level of distress were associated with the increase in the fear of going to the dentist due to COVID-19. Because of the pandemic, 16% of patients undergoing orthodontic treatment would not return to the dental practice to continue their orthodontic treatment after the lockdown. The prevalence of TMD pain in the population increased due to the pandemic.

Children’s perception towards parents on learning Mathematics in Sindhuli district

2021 ◽  
Vol 2 (01) ◽  
pp. 50-60
Author(s):  
Yam Prasad Pandeya
Keyword(s):  
Parent Involvement ◽  
Total Population ◽  
Vital Role ◽  
Mathematical Achievement ◽  
Chi Square ◽  
Course Of Action ◽  
Learning Mathematics ◽  
Chi Square Test ◽  
Level Of Significance ◽  
Structured Questionnaire

Parental factors play vital role in academic attainment of their offspring. Motivation and counseling stimulate someone to take a desired course of action. This paper attempts to explore the perception of children towards their patents in support, involvement, counseling, and motivation on learning mathematics. This study employed survey research design of the quantitative approach. The total population of the study was90 students (15 students from each six schools) enrolled in Grade ix of Sindhuli district in 2019. The data were collected through self-structured questionnaire using three points-Likert scale items. Mean and standard deviation of each item were calculated and Chi-square test at 5% level of significance was used to test the hypothesis. The finding of this study shows that the parents of Sindhuli district are very conscious about the study of their children whatever their educational level. This study suggests that parent involvement is an inseparable component to promote mathematical achievement of their offspring.

scholarly journals Classroom Attentiveness of Children from Home with Inter Parental Violence in Chamwino District, Tanzania

2021 ◽  
Vol 2 (Issue 4) ◽  
pp. 66-74
Author(s):  
Simion Kaminyoge Ambakisye
Keyword(s):  
Teaching And Learning ◽  
Survey Design ◽  
Cross Sectional Survey ◽  
Chi Square ◽  
Cross Sectional ◽  
Parental Violence ◽  
Chi Square Test ◽  
Level Of Significance ◽  
Parental Conflicts ◽  
The Relationship

This study investigated on classroom attentiveness of children from home with inter parental violence in Chamwino, Dodoma, Tanzania. The study employed the cross-sectional survey design whereby 312 out of 652 children from five secondary schools were randomly selected to participate by filling the questionnaire. Chi square test was employed to determine the relationship between violence against mothers and children’s attentiveness at the 0.05 level of significance. The results indicated a significant relationship between parental conflicts and lack of pupils’ adequate concentration in learning. The findings further showed that female children whose mothers are accustomed to violence are more inattentive than male children during the teaching and learning processes. The study recommends that effective intervention strategies such as developing training through psycho education within families, schools and the community be in place.

Attitude of Female Students Towards Physical Education and Sports

2020 ◽  
Vol 9 (1) ◽  
pp. 65-70
Author(s):  
Pashupati Adhikari
Keyword(s):  
Physical Education ◽  
Data Collection ◽  
Female Students ◽  
Degree Of Freedom ◽  
Chi Square ◽  
Positive Attitudes ◽  
Chi Square Test ◽  
Level Of Significance ◽  
The University ◽  
Very High

 This study presents an attitude of female students studying B.Ed. third year towards physical education and sports within Kathmandu valley. Initially, it was hypothesized that there is no significance difference in attitude of physical education and sports among female students of different campuses. From these 6 campuses, 184 female students were randomly selected. A five-point Likert-type scale was applied for data collection from the selected students who studied in B.Ed. third year. Altogether five opinion statements were used for data collection. It was found that all respondents showed positive attitudes towards physical education and sports. In order to test whether there is significant interdependence in score among the respondents in different perspectives. The chi-square test score was applied as statistical test at the 0.05 level of significance. The chi-test under contingency table: independent of opinion among the respondent, if (χ2>α=0.05 in different degree of freedom) and independent if (χ2≤ α=0.05 in different degree of freedom). For the measurement of attitude for physical education and sports,it has enough evidence in the data to accept alternatives hypothesis; there is relation or interdependence of attitude towards physical education and sports among the respondents. Because, the score is very high among the response of respondent. The study suggests that the university teacher must be accountable to construct professional environment.

scholarly journals Prevalência de lesões em atletas de Brazilian jiu-jitsu: comparação entre diferentes níveis competitivos

2018 ◽  
Vol 20 (3) ◽  
pp. 280-289 ◽  
Author(s):  
Jorge Nelson da Silva Júnior ◽  
Rafael Lima Kons ◽  
Rodolfo André Dellagrana ◽  
Daniele Detanico
Keyword(s):  
Logistic Regression ◽  
Regression Analysis ◽  
Odds Ratio ◽  
Injury Severity ◽  
Chi Square ◽  
Risk Of Injury ◽  
Injury Occurrence ◽  
High Prevalence ◽  
Chi Square Test ◽  
Level Of Significance

This study aimed to identify types and sites of body injury, location of injury occurrence, and the mechanism and severity of injuries in novice and advanced Brazilian jiu-jitsu (BJJ) athletes. One hundred and eight BJJ athletes took part in this study separated in two groups: advanced (n = 53) and novice (n = 55). Athletes answered a questionnaire concerning regions of injury, locality of occurrence, injury severity and mechanism. Chi square test and a logistic regression analysis were used with the level of significance set at p < 0.05. The main results showed that shoulders and knees were the most injury location reported by novice and advanced athletes. Novice athletes demonstrated higher prevalence of injuries during training sessions (54.5%), whereas advanced athletes reported more injuries during competitions (66.1%). Significant associations between novice and advanced athletes were observed for major joints (p < 0.05). The odds ratio of having injury was 70-87% less for novice versus advanced athletes for the major joints cited. We concluded that BJJ athletes demonstrate high prevalence of injury mainly at knee and shoulder. While risk of injury appeared less in novice, the advanced demonstrated higher number of injuries during competitions as a consequence of injured joint keys. By contrast, novice athletes reported higher number of injuries associated with training sessions as a consequence of overuse.

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