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کاربرد نوع شرط:
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Renewable Energies,electricity supply chain,operational planning,electricity storage
- چکیده:
- چکیده انگلیسی: Nowadays, utilization of renewable energies for satisfying electricity demand has received more interest, and renewable electricity generation has been growing in the world. This study addresses the operational planning of a renewable electricity supply chain over a multi-period planning horizon. The purpose of this study is to maximize total profit and to optimize the operational decisions related to power transmission and storage in a wind-based electricity supply chain. The applicability of the developed model is demonstrated by a case study. Due to the wind intermittency and demand variations, some probable scenarios are considered. Sensitivity analysis provides several managerial insights. Numerical results indicate that line capacity expansion can make a good promotion in each scenario by reducing unmet demand and making more profit. Moreover, incorporating an electricity storage system in wind farms improves demand covering in peak load hours.
- انتشار مقاله: 29-11-1395
- نویسندگان: Fatemeh Bayatloo,Ali Bozorgi-Amiri,Fatemeh Sabouhi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Multi-Objective Programming,Closed-loop supply chain,location model,paper recovery
- چکیده:
- چکیده انگلیسی: Governments and customers are forcing the paper manufacturers to become more sustainable. Accordingly, there still exists a gap in the quantitative modeling of these issues. In this paper, this gap is covered through simultaneously considering economical, environmental and social impacts in the paper closed-loop supply chain network design. The proposed multi-objective, multi-echelon, multi-product and single-period model is composed of suppliers, plants, regional wholesalers, retailers, customer zones, collection sites, centralized collection points, recycling facilities, energy recovery and disposal centers.The objectives considered are minimization of total cost; environmental benefit through maximizing coverage of collected waste paper by opened centralized collection centers; and maximization of the social impact of the network in a way that would prefer the location of facilities in the less populated regions.The proposed model is applied to an illustrative example designed utilizing real data of the paper industry in East Azerbaijan of Iran and interactive fuzzy goal programming approach is used to solve the developed model. Sensitivity analysis of the proposed model is also performed by considering key parameters.
- انتشار مقاله: 20-09-1395
- نویسندگان: Arezoo Rahmani-Ahranjani,Ali Bozorgi-Amiri,Mehdi Seifbarghy,Esmaeil Najafi
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Industrial and Systems Engineering
- نوع مقاله: Journal Article
- کلمات کلیدی: Disaster management,Scheduling,Routing,Multi-objective optimization
- چکیده:
- چکیده انگلیسی: Following the occurrence of unexpected events and natural disasters, a highly important relief operation is the transferring of relief commodities from the distribution centers (CDs) to shelters. In this paper, a three-level network consisting of depot of vehicles, distribution centers and shelters has been considered for routing and scheduling of relief vehicles through introducing a multi-objectivemodel. The first objective function represents the total arrival time of vehicles to CDs and shelters. The second objective function illustrates the number of vehicles used. We use the TH method to deal with the multi-objective problem. During the relief commodities distribution, issues such as the feasibility of getting servicefrom each distribution centerwith multiple vehicles, and heterogeneous fleet of vehicles has been regarded. In order to solve the proposed model and represent its efficiency, we select the fourth region of Tehran city as a case study, run the model on it, and present solution results.
- انتشار مقاله: 28-11-1394
- نویسندگان: Fatemeh Sabouhi,Mehdi Heydari,Ali Bozorgi-Amiri
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Computational Applied Mechanics
- نوع مقاله: Journal Article
- کلمات کلیدی: finite difference method,Wave Propagation,functionally graded materials,torsional wave
- چکیده:
- چکیده انگلیسی: In this study, torsional wave propagation is investigated in a rod that are made of one and two dimensional functionally graded material. Firstly, the governing equations of the wave propagation in the functionally graded cylinder derived in polar coordinate. Secondly, finite difference method is used to discretize the equations. The Von Neumann stability approach is used to obtain the time step size. Two states are assumed for material distribution, in first state it’s considered that the material variation occurred only in radial direction(Ti6A14V and Al2O3) and in second state the material properties vary in radial and length directions(BN, Al 1100, Ti6A14V and Al2O3). Moreover, the effect of cutoff frequency and boundary condition in wave propagation is studied. The results was validated by comparing the analytical and numerical solutions for an isotropic rode subjected to a torsional impulsive load. The results show that the torsional wave propagation in FGM rod evidently effects by material composition variation.
- انتشار مقاله: 03-10-1397
- نویسندگان: Alireza Amiri,Hossein Rahmani,Mohammad Ahmadi Balootaki
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Aerospace Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Obstacle avoidance,Formation flight,Behavior-based Algorithm,Constraint Optimization
- چکیده:
- چکیده انگلیسی: This paper presents a tuned behavior-based guidance algorithm for formation flight of quadrotors. The behavior-based approach provides the basis for the simultaneous realization of different behaviors such as leader following and obstacle avoidance for a group of agents; in our case they are quadcopters. In this paper optimization techniques are utilized to tune the parameters of a behavior-based guidance algorithm; to compromise between safety, trajectory optimality, and control effort during the formation flight. The tuning is formulated as a constraint optimization problem where the penalty function method is used to secure the safe passage of quadrotors around an obstacle. The guidance subsystem is integrated with a consistent dynamic inversion controller to realize a smooth maneuver of the quadrotors along desired trajectories. For more, MATLAB/Simulink is used as the programming platform. The effectiveness of the tuning method is verified, based on the performance of the closed-loop system in the presence of an overall navigation system uncertainties and actuator lags.
- انتشار مقاله: 27-06-1398
- نویسندگان: Ehasan Zibaei,Mohammad-Ali Amiri Atashgah,Ahmad Kalhor
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Aerospace Science and Technology
- نوع مقاله: Journal Article
- کلمات کلیدی: Obstacle avoidance,Formation flight,Behavior-based Algorithm,Constraint Optimization
- چکیده:
- چکیده انگلیسی: This paper presents a tuned behavior-based guidance algorithm for formation flight of quadrotors. The behavior-based approach provides the basis for the simultaneous realization of different behaviors such as leader following and obstacle avoidance for a group of agents; in our case they are quadcopters. In this paper optimization techniques are utilized to tune the parameters of a behavior-based guidance algorithm; to compromise between safety, trajectory optimality, and control effort during the formation flight. The tuning is formulated as a constraint optimization problem where the penalty function method is used to secure the safe passage of quadrotors around an obstacle. The guidance subsystem is integrated with a consistent dynamic inversion controller to realize a smooth maneuver of the quadrotors along desired trajectories. For more, MATLAB/Simulink is used as the programming platform. The effectiveness of the tuning method is verified, based on the performance of the closed-loop system in the presence of an overall navigation system uncertainties and actuator lags.
- انتشار مقاله: 27-06-1398
- نویسندگان: Ehasan Zibaei,Mohammad-Ali Amiri Atashgah,Ahmad Kalhor
- مشاهده
- جایگاه : پژوهشی
- مجله: Journal of Advances in Medical Education and Professionalism
- نوع مقاله: Journal Article
- کلمات کلیدی: Emotional Intelligence,Stress,Academic success,professional competence
- چکیده:
- چکیده انگلیسی: Introduction: Emotional intelligence is a social skill that controls stress and affects one’s ability to cope with the demands and environmental pressures; it so can improve professional competence in health care providers such as nursing students. Training on emotional intelligence increases the mental health and influences the mutual relationships, stress, depression and aggression. This study aimed to determine the effect of emotional intelligence skills training program on the stress and academic success of nursing students in a higher education health complex.
Methods: This study is a quasi-experimental study with an educational intervention. The participants included 100 students of nursing selected by stratified random sampling from both genders. They were randomly categorized into two intervention and control groups including 50 subjects, respectively. We used Meyer and Salvia model in Emotional Intelligence training in the intervention group. During the training sessions in the intervention group, the control group did not receive any intervention. Academic stress and professional competence in both groups were measured before and two weeks after the experiment. SPSS version 21 was used to analyze the data, using Paired t-test, independent t-test, Wilcoxon, Mann-Whitney and Chi-Square tests.
Results: The mean age of the participants was 20±2.14 years old. According to the results, the mean difference of the changes in the professional competence (p<0.001), total academic stress
(p<0.001), and the four areas of academic stress such as emotional response (p<0.001), physical response (p<0.001) and physiological response (p<0.001) were significant. The intervention group, as compared with the control group, showed no significant effect on the other factors of academic stress such as frustration, conflict, academic pressure, changes and self-imposed stress.
Conclusion: The education of emotional intelligence components can improve the efficiency of nursing care services and professional competence due to deceased stress.- انتشار مقاله: 26-10-1397
- نویسندگان: AFAGH AGHAJANI INCHE KIKANLOO,KATAOUON JALALI,ZAHRA ASADI,NASRIN SHOKRPOUR,MALIHEH AMIRI,LEILA BAZRAFKAN
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Osteoporosis,Body Mass Index,Bone Density,Cancellous bone
- چکیده:
- چکیده انگلیسی: Background: Trabecular bone score (TBS) measures the underlying quality of bone texture using dual-energy X-ray absorptiometry (DXA) images. The present study aimed to investigate the correlation between lumbar spine bone mineral density (BMD) and TBS, and subsequently determine whether the association varies with the body mass index (BMI).
Methods: Data from 548 patients were collected and categorized into three groups according to the relationship between BMD and age. BMD of the lumbar spine (LS) using DXA and TBS from DXA images were measured. Pearson’s correlation coefficient (SPSS software, version 24.0) was used to investigate the association between LS-BMD and TBS, as well as the effect of BMI and age on these parameters. PResults: The total mean TBS was 1.31±0.12. LS-BMD and TBS values significantly decreased with age in both sexes. A statistically significant correlation was found between TBS and LS-BMD (r=0.601). An increase in BMI was associated with a higher LS-BMD score and a lower TBS level. The correlation coefficient between LS-BMD and TBS reduced as the BMI increased. By comparing TBS with BMD, the majority of the patients with osteopenia and osteoporosis had fully degraded and partially degraded TBS, respectively.
Conclusion: TBS was positively correlated with LS-BMD and decreased with age. Moreover, the extent of the correlation varied with respect to BMI.- انتشار مقاله: 27-08-1396
- نویسندگان: Alireza Rajaei,Ali Amiri,Faraneh Farsad,Pooneh Dehghan
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Medical Sciences
- نوع مقاله: Journal Article
- کلمات کلیدی: Methamphetamine,Inpatients,Domestic violence,Psychotic disorders
- چکیده:
- چکیده انگلیسی: Background: Domestic violence is a serious threat to the physical and mental health of women. The aim of the present study was to find and compare the frequency of domestic violence between methamphetamine users, patients with psychiatric disorders, and healthy people.Methods: In this analytical cross-sectional study, methamphetamine users (n=30) and patients with psychiatric disorders (n=30) were women whose husbands were hospitalized during 2014 in Shafa Psychiatric Hospital in Guilan. Diagnosis was done with DSMIV-TR. Healthy people (n=60) were women whose husbands had no primary or drug induced psychiatric disorder or addiction. CTS-2 test was used to evaluate violence. Results: The frequency of psychological, physical and sexual violence in the groups suffering from psychiatric disease and methamphetamine users was higher than the healthy group (P=0.001). We observed a direct correlation between the mean of psychological and physical violence in the three groups (r=0.9, P=0.001), (r=0.7, P=0.0001) and (r=0.53, P=0.005), respectively. Direct correlation between the psychological and physical violence was only observed in the healthy group (r=0.8, P=0.007).Conclusion: The results showed that methamphetamine users such as psychiatric patients are at increased risk of violence. Domestic violence screening of these patients is necessary. It seems that this substance is a new source of increasing domestic violence with more undesirable outcomes in Iran.
- انتشار مقاله: 28-03-1394
- نویسندگان: Seyed Mohammad Rasoul Khalkhali,Kiomars Najafi,Reza Ahmadi,Azadeh Yousefnezhad,Azam Hamidi,Masoumeh Ellahi,Ali Amiri,Afsar Montakhabi,Maryam Zavarmousavi
- مشاهده
- جایگاه : پژوهشی
- مجله: Iranian Journal of Finance
- نوع مقاله: Journal Article
- کلمات کلیدی: Information Technology,Auditing,Ethical Behavior,and the Developed Unified Theory of Acceptance and Use of Technology
- چکیده:
- چکیده انگلیسی: This study aims to investigate the relationship between technology use factors based on the developed unified theory of acceptance and use of technology (DUTAUT) with auditors' ethical behavior. This research is applied and descriptive-correlational and its population include various auditors of Iran, 164 of whom are selected using simple random sampling. Structural equations and Smart PLS software analysis are also used to test the hypotheses. The findings show that there is a positive and significant relationship between technology use factors based on DUTAUT, including motivational components, effort expectancy, performance expectancy, and social effects, and ethical behavior of auditors. Other findings show that there is a positive and significant relationship between motivation (64%), effort expectancy (31%), and social effects (43%) with auditors' ethical behavior at the 95% confidence level. Given that the use of technology is expanding and is in line with current social needs and increases the level of ethical behavior in auditors, it is necessary to pay more attention to it in order to increase the ethical climate in this profession.
- انتشار مقاله: 11-05-1399
- نویسندگان: Hossein Rajabdorri,Hamidreza Vakilifard,Hojjatollah Salari,Ali Amiri
- مشاهده