Writing and presenting a systematic review emphasizing the Cochrane Handbook for systematic reviews

BACKGROUND: The systematic review is a scientific method for identifying and presenting early research, quality assessment, and integration of their results. This study aimed to describe the principles of systematic reviews and inscribe related articles emphasizing the Cochrane Handbook, for using of medical and health students.METHODS: This study was a library review and a compilation of materials on how to conduct review studies in medical sciences and health with emphasis on the Cochrane Handbook.RESULTS: The findings of this study indicated that review studies have different types, most notably systematic reviews. The Cochrane Handbook provides valuable information collections for conducting these studies in medical sciences, and allows systematic reviews to step by step facilitate and publish relevant articles.CONCLUSION: Writing a systematic review involves defining the purpose and protocols, systematically searching for primary studies, critical assessment, selection of the studies, and then, analysis and integration of the final results

Energy-efficient production control of a make-to-stock system with buffer- and time-based policies

peer reviewedIncreasing energy efficiency in manufacturing has significant environmental and cost benefits. Turning on or off a machine dynamically while considering the production rate requirements can offer substantial energy savings. In this work, we examine the optimal policies to control production and turn on and off a machine that operates in working, idle, off, and warmup modes for the case where demand inter-arrival, production, and warmup times have phase-type distributions. The optimal control problem that minimises the expected costs associated with the energy usage in different energy modes and the inventory and backlog costs is solved using a linear program associated with the underlying Markov Decision Process. We also present a matrix-geometric method to evaluate the steady-state performance of the system under a given threshold control policy. We show that when the inter-arrival time distribution is not exponential, the optimal control policy depends on both the current phase of the inter-arrival time and inventory position. The phase-dependent policy implemented by estimating the current phase based on the time elapsed since the last arrival yields a buffer- and time-based policy to control the energy mode and production. We show that policies that only use the inventory position information can be effective if the control parameters are chosen appropriately. However, the control policies that use both the inventory and time information further improve the performance.TUBITA

Writing and presenting a systematic review emphasizing the Cochrane Handbook for systematic reviews

BACKGROUND: The systematic review is a scientific method for identifying and presenting early research, quality assessment, and integration of their results. This study aimed to describe the principles of systematic reviews and inscribe related articles emphasizing the Cochrane Handbook, for using of medical and health students. METHODS: This study was a library review and a compilation of materials on how to conduct review studies in medical sciences and health with emphasis on the Cochrane Handbook. RESULTS: The findings of this study indicated that review studies have different types, most notably systematic reviews. The Cochrane Handbook provides valuable information collections for conducting these studies in medical sciences, and allows systematic reviews to step by step facilitate and publish relevant articles. CONCLUSION: Writing a systematic review involves defining the purpose and protocols, systematically searching for primary studies, critical assessment, selection of the studies, and then, analysis and integration of the final results

Effectiveness of a Community and School-Based Intervention to Control and Prevent of Tobacco Use in Adolescents: A Field Randomized Controlled Trial.

This article contains the authors' experience of a school and community-based intervention in Iran to prevent and reduce smoking in high school students. This has lessons for health school and community-based interventions. Adolescence is associated with several risky behaviors, such as increased use of tobacco (1). If the current trend continues, 250 million living children and adolescents who continue tobacco use into adulthood will die of health problems related to tobacco use (2). Given the global epidemiologic transition from poverty diseases to non-communicable diseases, the burden of disease and health risks among adolescents and young adults has changed significantly due to the undeniable role of substance use (3), including Iran (4). Therefore, a need for prevention and control programs of tobacco among adolescents and different implementation methods cannot be understated. Tobacco use prevention programs administered in schools are effective in reducing future smokers (5), although the interpretation of evidence for school-based prevention programs are affected by methodological issues. We conducted a field randomized controlled trial in East Azerbaijan, Iran, during the 2014–15 school year. Study subjects (n=4422) included high school students (intervention group=1965, control group=2457). Data were collected through self-reporting questionnaires and analyzed using SPSS ver. 23 (Chicago, IL, USA). The six-month intervention program consisted of training and environmental adaptations in cooperation with appropriate authorities. Training included teaching school staff about the health risks associated with tobacco use in adolescents and the health benefits of quitting. Physical education teachers were selected to train students about the health risks of tobacco use and how to resolve to say no to it and in 10 training sessions. In addition, students were asked to introduce their reliable peers as leader (15% of each school population) to contribute to the intervention program. The students participated in a one-hour orientation program, with question and answer time and two training videos shown in two sessions. These trained students (“peer leaders”) were requested to share their information and knowledge about tobacco use and challenge its use during the recess times. A campaign was also formed in the mosques and health centers to disseminate the message for communal effort to prevent and control tobacco access to the adolescents using leaflets and posters. Furthermore, measures were taken to ban tobacco use in public places, tobacco sale in proximity of schools, and sale to high school students. These measures were coordinated and implemented with assistance from school, trade, and police authorities. In the next step, the tobacco rehabilitation center phone number was publicized using placards in the town. The town committee on tobacco use met every two months and was updated on the progress of the program by different organizations and problems were addressed. There was no intervention in the control town (group). Once the intervention was completed, 1885 students in the intervention city and 2305 students in the control city responded to our questionnaire. The participants were high school student, 54.7% male and 45.3% female with a mean age of 15.81 (SD=1.15). The mean of cigarette start age was 12.4 (SD=3.42) and the mean for hookah smoking start age was 13.52 (SD=2.74). The proportions of students experimented with cigarette and hookah for at least one time were 10.7% and 19.7%, respectively. Age, gender, mother’s education, and locality were used as confounding variables and were controlled. The intervention led to an increased awareness of the side effects of tobacco (mean difference=0.36, CI.95= (0.12, 0.54)), prevention of negative changes in attitude towards tobacco (mean difference=1.59, CI.95= (−2.26, − 0.92)), and prevention of behavioral intention to tobacco use (mean difference = 0.43, CI = (0.06, 0.81), P<0.001). Post-intervention follow-up showed that initiating cigarette use after six months increased non-significantly in both groups but the changes within group were significant and higher in the control group. Hookah use increased significantly after six months in the control group and differed significantly from the baseline (P<0.02) and from the intervention group (P<0.001). Cigarette use increased in both groups in the past six months and 30 d but the increase in the past 30 d was higher in the intervention group (P<0.001). Quitting cigarette increased in the intervention group but decreased in the control group with a significant difference (P<0.001). In the past six months, the start of tobacco use, especially the hookah was significant in the control group, implying the need for urgent attention to smoking trend among the youth. Our results showed that intervention programs are effective in preventing tobacco use in nonsmokers than those who already smoke. Involving teachers in policies, and encouraging participation and cooperation among different authorities of community contribute to the control and prevention of tobacco use

Effectiveness of a Community and School-Based Intervention to Control and Prevent of Tobacco Use in Adolescents: A Field Randomized Controlled Trial

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Project plan used in MCMC- Primavera Risk Analysis File

This file contains the master plan for a construction project. Moreover, this is the basis of Beta-S model which is used in Bayesian Updating method to predict the total duration of the proposed project. The project plan consists of 50 activities and the total planned duration of 1100 days. The uncertainties of all activities and their probable correlations to other activities are defined. This plan is a real project plan in the field of construction

Production and energy mode control of a production-inventory system

Energy efficiency in manufacturing can be improved by controlling energy modes and production dynamically. We examine a production-inventory system that can operate in Working, Idle, and Off energy modes with mode-dependent energy costs. There can be a warm-up delay to switch between one mode to another. With random inter-arrival, production and warm-up times, we formulate the problem of determining in which mode the production resource should operate at a given time depending on the state of the system as a stochastic control problem under the long-run average profit criterion considering the sales revenue together with energy, inventory holding and backlog costs. The optimal solution of the problem for the exponential inter-arrival, production and warm-up times is determined by solving the Markov Decision Process with a linear programming approach. The structure of the optimal policy for the exponential case uses two thresholds to switch between the Working and Idle or Working and Off modes. We use the two-threshold policy as an approximate policy to control a system with correlated inter-event times with general distributions. This system is modelled as a Quasi Birth and Death Process and analyzed by using a matrix-geometric method. Our numerical experiments show that the joint production and energy control policy performs better compared to the pure production and energy control policies depending on the system parameters. In summary, we propose a joint energy and production control policy that improves energy efficiency by controlling the energy modes depending on the state of the system