Improving long line stability by integrating renewables using static synchronous generators

Postprint (author's final draft

Synchronous power controller merits for dynamic stability improvement in long line by renewables

Postprint (author's final draft

Analyzing the consequences of urban land use on rural residences using satellite imagery and Markov chain model (Case study: Kerman city)

Objective Expansion without the urban plan of the city and its integration with villages and urban settlements in developing countries, including Iran, is unavoidable. It can be said that one of the most important factors in the dispersed growth of the city of Kerman has been changes without land use planning. Hence, predicting these changes can play a significant role in future management decisions and future plans of the city. Methods: Considering the high performance of the CA-Markov model in predicting land use changes, in this study, this model was designed with the aim of predicting the development trend and land use changes in the year 1406 horizons. From satellite images of the years 1368, 1379, 1387 and 1396 To predict and detect changes. Results:The results show that in the prediction map of 1406, the area of ​​the three classes, the lands constructed 10273 hectares, the land of 1229 hectares and the vegetation of 9983 hectares will be. Also, the map shows that the area of ​​dry land classes and vegetation decreased by 118 and 219 hectares, respectively. Also, the class of lands constructed from the base year (1396) did not change significantly. Conclusion: Considering the high efficiency of this model in forecasting land use changes, its results can be used in future planning and decision making in Kerman

An Efficient Metric for Physical-layer Jammer Detection in Internet of Things Networks

An active jammer could severely degrade the communication quality for wireless networks. Since all wireless nodes openly access the shared media, the harsh effects are exaggerated by retransmission attempts of affected devices. Fast and precise detection of the jammer is of vital importance for heterogeneous wireless environments such as the Internet of things (IoT). It could activate a series of corrective countermeasures to ensure the robust operation of the network. In this paper, we propose a local, straightforward, and numerical metric called the number of jammed slots (NJS), by which we can quickly detect the presence of a jammer and identify the jammed nodes at the software level in broadcast networks. NJS calculation is carried out by a central node which collects the MAC-layer statuses of all wireless nodes in a periodical fashion. Our simulation results indicate that NJS outperforms current detection methods in terms of accuracy and precision

Supporting phase stability on interconnected grids by synchronous renewable virtual power plants

Rapid growing on the power level of renewable generation units leads to that using more adaptable and flexible control techniques in this units becomes more important for grid operators. In this paper, after introducing Renewable Static Synchronous Generation Units (RSSGU) as units with flexible dynamics capability, forming of renewable Virtual Power Plants based on this RSSGUs (VPP-SSG) is suggested as a solution for overcoming phase stability challenges on interconnected generation areas. Based on the dynamic modeling and small signal analysis, an algorithm is presented for the dynamic designing of VPP-SSGs aims to provide supporting damping for both local and interarea oscillatory modes. Modal analysis and time domain study on active powers inside of generation areas and tie lines on two area system using Simulink confirms that these type of VPP-SSGs can support phase stability on power grid with interconnected generation areasPeer ReviewedPostprint (author's final draft

A comparative study on effectiveness of workshop education versus education via mobile learning (m-learning) in developing medical students’ knowledge and skill about cardiopulmonary resuscitation

INTRODUCTION: A variety of educational approaches are being used today to improve learning in the field of cardiopulmonary resuscitation. Therefore, the present study was conducted to compare workshop education with education via mobile learning (M-learning) in terms of their efficacy in developing medical students’ knowledge and skills about cardiopulmonary resuscitation. MATERIAL AND METHODS: The present study was quasi-experimental performed on 60 interns selected from a university of medical sciences in southwest Iran. Participants were assigned to either the workshop education group (n = 30) or the mobile learning group (n = 30). Before and after the intervention, the knowledge and skills of the participants in terms of basic and advanced cardiopulmonary resuscitation were measured by a questionnaire. The collected data were analyzed using descriptive statistics, Independent-Samples t-Test, Paired-Samples t-Test, and Chi-Square Test in SPSS software v. 22. RESULTS: Education via mobile learning caused a significant increase in the participants’ knowledge about cardiopulmonary resuscitation (p < 0.05). However, this method did not result in a significant difference in the participants’ skill scores, while the workshop education group showed a significant increase in their cardiopulmonary resuscitation skill scores (p < 0.05). CONCLUSIONS: Our results revealed that education via mobile learning was better in enhancing medical students’ knowledge about cardiopulmonary resuscitation. However, workshop education was more effective in developing practical skills in the field of cardiopulmonary resuscitation. Accordingly, educators are recommended to employ a combination of mobile learning and workshop education for achieving better results

An Assessment of Cycling Routes in Terms of Movement and Accessibility Using the MABAC Method (Case Study: Districts 1 and 3 of Isfahan City)

Abstract  The ever-increasing expansion of urbanization has caused an increase in activity density in cities and has created many problems in urban transportation. The development of sustainable types of travel for inner-city traffic, such as cycling, is inevitable to face the factors disturbing the comfort of citizens. On the other hand, the inadequacies in the bicycle path network have decreased this mode of transportation. It is noteworthy that Districts 3 and 1 in Isfahan, located in the historical and valuable center, are pioneers in bicycle path construction. This research seeks to investigate the movement and accessibility in the cycling routes of Districts 3 and 1 of Isfahan City. This is a mixed-method research, collecting the data through documentary analysis and field studies. The authors used the MABAC analytical method for data integration and the final research analysis. The results show that out of a total of 22 cycling routes in Districts 1 and 3 of Isfahan City, Motahari (0.183), Chaharbagh Abbasi (0.174), and Saeb (0.132) are the best cycling routes. On the other hand, Pasdaran (-0.127), Bagh Goldaste (-0.086), and Ayatollah Khorasani (-0.084) have the lowest scores of all. Finally, some suggestions to improve the condition of these routes are presented.Keywords: Assessment, Movement and Accessibility, Cycling Route, MABAC, Districts 1 and 3 of Isfahan City. IntroductionThe expansion of urbanization has caused an increase in population density and activity in cities and has created many problems for urban settlements. One of the most critical challenges in the metropolitan area is transportation. In recent years, planners have welcomed active mobility in the form of walking and cycling as a global strategy. Using active transportation methods in trips reduces traffic and increases the quality and health of the environment; on the other hand, the inadequacies in the network of cycling routes have led to a decrease in the use of this mode of transportation. Movement and accessibility in cycling routes can make cycling a very efficient tool for solving environmental, transportation, and social problems. In our country, in recent years, city managers have been encouraging people to use alternative methods for moving around the city instead of using cars, considering the cycling routes and providing suitable facilities and services. Considering the importance of replacing the transportation modes, in Isfahan, cycling routes with 777 kilometers are being built in 15 Districts. Districts 3 and 1 of Isfahan City (located in the historical, tourist, and commercial center of Isfahan City) are a pioneer in constructing a 12150-meter-long cycling path. In this research, we analyze the cycling routes of districts 3 and 1 of Isfahan regarding movement and accessibility indicators. Materials and MethodsThe current applied research is descriptive-analytical. At first, the data were extracted using documentary and field (observation) studies. Then, the data were analyzed using two quantitative and qualitative methods. Topography analysis, access analysis, and GIS software were used to evaluate the quantitative metrics. Qualitative research metrics were also identified using the analytical tables of possibilities and limitations. Finally, the MABAC method was used to combine research data and the final analysis. Compared to other multi-criteria decision-making methods, this method is considered one of the newest methods to weigh and evaluate the criteria and alternatives. Research FindingsThe results indicate that the measures of the radius of the arc of cycling paths (0.003), the amount of open sight distance (0.006), the amount of stopping sight distance (0.009), and the integration between cycling paths and public transport (0.012) are most useful in cycling routes. On the other hand, the measures of the variety and beauty of the elements, the bicycle parking accessibility, the length of the cycling route, and the placement of the guide signs along the road have the lowest level of desirability among the cycling routes.Regarding cycling routes, Motahari (0.183), Chaharbagh Abbasi (0.174), and Saeb (0.132) routes are the most desirable, respectively. Pasdaran cycling routes (-0.127), Ayatollah Khorasani (-0.084), Bagh Guldasteh (-0.086) and Seyed Alikhan (-0.077), respectively, have the lowest favorability in terms of the determined indicators. Discussion of Results and ConclusionsThere are several reasons for the formation of problems in the cycling routes of Districts 1 and 3 of Isfahan. These reasons include the existing weaknesses of decision-making and policy-making in urban management, environmental and physical limitations, financial limitations, legal limitations, the inadequacy of existing plans, and traffic limitations. The operational proposals presented are prioritized in the order of action priority so that it can be a way to overcome the existing constraints