List of Articles Sampling

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  1 - Effects of Wave Polarization on Microwave Imaging Using Linear Sampling Method
  Mehdi Salar Kaleji Mohammad  Zoofaghari reza Safian Zaker Hossein  Firouzeh
  10.7508/jist.2015.03.004
  Linear Sampling Method (LSM) is a simple and effective method for the shape reconstruction of unknown objects. It is also a fast and robust method to find the location of an object. This method is based on far field operator which relates the far field radiation to its More

  Linear Sampling Method (LSM) is a simple and effective method for the shape reconstruction of unknown objects. It is also a fast and robust method to find the location of an object. This method is based on far field operator which relates the far field radiation to its associated line source in the object. There has been an extensive research on different aspects of the method. But from the experimental point of view there has been little research especially on the effect of polarization on the imaging quality of the method. In this paper, we study the effect of polarization on the quality of shape reconstruction of two dimensional targets. Some examples are illustrated to compare the effect of transverse electric (TE) and transverse magnetic (TM) polarizations, on the reconstruction quality of penetrable and non-penetrable objects. Manuscript profile
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  2 - Extracting Credit Rules from Imbalanced Data: The Case of an Iranian Export Development Bank
  Seyed Mahdi  Sadatrasoul mohammadreza gholamian Kamran shahanaghi
  10.7508/jist.2015.01.004
  Credit scoring is an important topic, and banks collect different data from their loan applicant to make an appropriate and correct decision. Rule bases are of more attention in credit decision making because of their ability to explicitly distinguish between good and b More

  Credit scoring is an important topic, and banks collect different data from their loan applicant to make an appropriate and correct decision. Rule bases are of more attention in credit decision making because of their ability to explicitly distinguish between good and bad applicants. The credit scoring datasets are usually imbalanced. This is mainly because the number of good applicants in a portfolio of loan is usually much higher than the number of loans that default. This paper use previous applied rule bases in credit scoring, including RIPPER, OneR, Decision table, PART and C4.5 to study the reliability and results of sampling on its own dataset. A real database of one of an Iranian export development bank is used and, imbalanced data issues are investigated by randomly Oversampling the minority class of defaulters, and three times under sampling of majority of non-defaulters class. The performance criterion chosen to measure the reliability of rule extractors is the area under the receiver operating characteristic curve (AUC), accuracy and number of rules. Friedman’s statistic is used to test for significance differences between techniques and datasets. The results from study show that PART is better and good and bad samples of data affect its results less. Manuscript profile
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  3 - Murder and Typification of the forgiveness (A Case Study of Guilan)
   
  Main purpose this research is “Typification of the forgiveness based on inductive strategy”. In this strategy, the interviewees perception about the forgivness by interpretivism approach have been investigated. This research has been with qualitative method and purp More

  Main purpose this research is “Typification of the forgiveness based on inductive strategy”. In this strategy, the interviewees perception about the forgivness by interpretivism approach have been investigated. This research has been with qualitative method and purposive sampling, and individual and group (Focus group) interviews. According to the logic of theoretical saturation, twenty seven individually and three group were interviewed. Then researcher analyzed interviews with method thematic analyze. Overall,the findings indicates that there are two general type of forgiveness.The first is self- oriented forgiveness and the second is other- oriented forgiveness . In the first part exist various species such as: Forgiveness oppositions, forgiveness supporters, replaced forgiveness and intent - oriented forgiveness. Other-oriented forgiveness can observe types three: forgivenes oppositions, reluctantly Forgiveness and intent-oriented forgiveness. People reacted to the murder of their close relatives to criminal calculate and assess the benefits of forgiveness and revenge, and then act.Based on the research findings the forgivness is time and space, because it depend to the position of the offender or the victim and the time between the crime and punishment Manuscript profile
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  4 - A Novel Energy-Efficient Algorithm to Enhance Load Balancing and Lifetime of Wireless Sensor Networks
  S. Abbasi-Daresari J. Abouei
  Wireless senor networks (WSNs) are widely used for the monitoring purposes. One of the most challenges in designing these networks is minimizing the data transmission cost with accurate data recovery. Data aggregation using the theory of compressive sampling is an effec More

  Wireless senor networks (WSNs) are widely used for the monitoring purposes. One of the most challenges in designing these networks is minimizing the data transmission cost with accurate data recovery. Data aggregation using the theory of compressive sampling is an effective way to reduce the cost of communication in the sink node. The existing data aggregation methods based on compressive sampling require to a large number of nodes for each measurement sample leading to inefficient energy consumption in wireless sensor network. To solve this problem, we propose a new scheme by using sparse random measurement matrix. In this scheme, the formation of routing trees with low cost and fair distribution of load on the network significantly reduces energy consumption. Toward this goal, a new algorithm called “weighted compressive data gathering (WCDG)” is suggested in which by creating weighted routing trees and using the compressive sampling, the data belong to all of nodes of each path is aggregated and then, sent to the sink node. Considering the power control ability in sensor nodes, efficient paths are selected in this algorithm. Numerical results demonstrate the efficiency of the proposed algorithm with compared to the conventional data aggregation schemes in terms of energy consumption, load balancing, and network lifetime. Manuscript profile
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  5 - Exponential Stability Analysis of Discrete Linear Teleoperation Systems with Nonuniform Sampling
  A. Aminzadeh Ghavifekr A. Rikhteghar Ghiasi M. A. Badamchizadeh F. Hashemzadeh
  Teleoperation systems have attracted more attention in processes that human operator’s availability is difficult. In this paper, using retarded functions, teleoperation systems have been modeled as a special case of Network Control Systems (NCS) with nonuniform sampling More

  Teleoperation systems have attracted more attention in processes that human operator’s availability is difficult. In this paper, using retarded functions, teleoperation systems have been modeled as a special case of Network Control Systems (NCS) with nonuniform sampling and network delays. It is assumed that slave and master robots are linear and continues-time systems and input-delay approach is used for the stability analysis. Using the proposed Lyapunov function, the sufficient conditions for the stability of discrete network-based teleoperation system is proposed. It will be represented that the proposed conditions are less conservative than previous recent researches. Also an upper bound of sampling time for discrete control signals is computed in a manner that does not disturb the stability conditions. To meet this condition the problem is defined as the convex optimization program and is represented by the LMI terms. In the simulation part, the behavior of the teleoperation system under the nonuniform sampling is represented and the effect of sampling time on the trade-off between the stability and transparency has been studied. Manuscript profile
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  6 - The Effect of Irrigation Water Salinity and Other Production Factors on Potato Crop yield in Hamadan – Bahar Plain
  Moein Sadeghi Seyed Mohsen  Seyedan
  Increasing agricultural production due to rapid population growth and consequently increasing water demand in recent decades has led to uncontrolled withdrawal and drop in groundwater levels in Hamadan-Bahar plain. This has led to a sustained drop in groundwater level i More

  Increasing agricultural production due to rapid population growth and consequently increasing water demand in recent decades has led to uncontrolled withdrawal and drop in groundwater levels in Hamadan-Bahar plain. This has led to a sustained drop in groundwater level in the plain and it has caused it to be among the critical plains of the province. This phenomenon has caused water salinity in addition to damage to groundwater resources. The purpose of this study was to investigate the effect of groundwater salinity on potato yield. In order to investigate the effect of water salinity on potato yield, the yield function of this crop has been estimated. By random sampling method, data used from 119 farms were collected in the 2018-19 crop year and the amount of water salinity has been measured in two steps in the laboratory. Based on the criteria and the test, the production function was selected in the form of a quadratic function for estimating the relationships between variables. The results of this study indicate that with an increase of one unit in the amount of water salinity, the production of this product has decreased by 860 kg. The final productivity of water, seeds and chemical fertilizers are 0.2, 23 and -14, respectively, so, it can be said that potato farmers in Hamedan-Bahar plain use optimum amount of water, seed less than optimum amount and chemical fertilizer more than optimum amount. Manuscript profile
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  7 - An overview of sampling, sample size and data collection methods in veterinary research
  Dariush Saadati Samira Saadat jou Ali Anusha
  https://doi.org/10.61186/eltiam.10.2.3
  At the beginning of any study, these questions usually come to the researcher's mind; How many samples should be taken to conduct this study? How are these samples selected from the target population? How I can collect the required data? In this article, we are going to More

  At the beginning of any study, these questions usually come to the researcher's mind; How many samples should be taken to conduct this study? How are these samples selected from the target population? How I can collect the required data? In this article, we are going to answer these questions. In order to choose the appropriate sample size, attention should be paid to the statistical method with which the data is to be analyzed. In the surveys, the researcher intends to estimate the desired average or prevalence in the population with 95% confidence interval. There are two formulas for determining the sample size in surveys that are referred to. In studies, the aim is to compare the average or prevalence between different groups. In each study, according to which statistical test to use for data analysis, there is a specific formula for determining the sample size, some of which are mentioned in this article. In order to choose the sampling method from a statistical point of view, attention should be paid to the type of research, in surveys and cross-sectional observational studies, the samples should be randomly selected from among the members of the population. Otherwise, these samples will not be representative of the target population. But in interventional studies, random sampling method is not considered. Rather, there are inclusion criteria, and any person or animal (in veterinary studies) who meets these criteria can enter the study. After the members enter the intervention study, these members should be randomly assigned to different treatments. The required data to conduct research can be collected through examination, observation, experiments or interviews. A questionnaire must be designed for the interview. In designing the questionnaire, attention should be paid to the validity and reliability of the questions. Manuscript profile