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- 저자 : Ayyoubzadeh, Seyed Mohsen (검색결과 3 건)
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Saghafi, Mahdi,Ayyoubzadeh, Seyed Mohsen,Terman, Mohammad Sadegh Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12
This paper deals with the simulation-based design optimization and experimental validation of the characteristics of an in-core silver Self-Powered Neutron Detector (SPND). Optimized dimensions of the SPND are determined by combining Monte Carlo simulations and analytical methods. As a first step, the Monte Carlo transport code MCNPX is used to follow the trajectory and fate of the neutrons emitted from an external source. This simulation is able to seamlessly integrate various phenomena, including neutron slowing-down and shielding effects. Then, the expected number of beta particles and their energy spectrum following a neutron capture reaction in the silver emitter are fetched from the TENDEL database using the JANIS software interface and integrated with the data from the first step to yield the origin and spectrum of the source electrons. Eventually, the MCNPX transport code is used for the Monte Carlo calculation of the ballistic current of beta particles in the various regions of the SPND. Then, the output current and the maximum insulator thickness to avoid breakdown are determined. The optimum design of the SPND is then manufactured and experimental tests are conducted. The calculated design parameters of this detector have been found in good agreement with the obtained experimental results.
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Mobile Health Technology and Healthcare Providers: Systemic Barriers to Adoption
Somayyeh Zakerabasali,Seyed Mohammad Ayyoubzadeh,Tayebeh Baniasadi,Azita Yazdani,Shahabeddin Abhari 대한의료정보학회 2021 Healthcare Informatics Research Vol.27 No.4
Objectives: Despite the growing use of mobile health (mHealth), certain barriers seem to be hindering the use of mHealthapplications in healthcare. This article presents a systematic review of the literature on barriers associated with mHealthreported by healthcare professionals. Methods: This systematic review was carried out to identify studies published fromJanuary 2015 to December 2019 by searching four electronic databases (PubMed/MEDLINE, Web of Science, Embase, andGoogle Scholar). Studies were included if they reported perceived barriers to the adoption of mHealth from healthcare providers’perspectives. Content analysis and categorization of barriers were performed based on a focus group discussion thatexplored researchers’ knowledge and experiences. Results: Among the 273 papers retrieved through the search strategy, 18works were selected and 18 barriers were identified. The relevant barriers were categorized into three main groups: technical,individual, and healthcare system. Security and privacy concerns from the category of technical barriers, knowledge andlimited literacy from the category of individual barriers, and economic and financial factors from the category of healthcaresystem barriers were chosen as three of the most important challenges related to the adoption of mHealth described in the includedpublications. Conclusions: mHealth adoption is a complex and multi-dimensional process that is widely implementedto increase access to healthcare services. However, it is influenced by various factors and barriers. Understanding the barriersto adoption of mHealth applications among providers, and engaging them in the adoption process will be important for thesuccessful deployment of these applications.
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S. L. Razavi Toosi,S. A. Ayyoubzadeh,A. Valizadeh 대한토목학회 2015 KSCE Journal of Civil Engineering Vol.19 No.3
In hydrodynamic and hydraulic sciences, free surface flows are important but they are difficult to simulate. Smoothed ParticleHydrodynamics (SPH) is a meshfree, Lagrangian particle method for modeling a free surface flow phenomenon such as dam break. One of the problems in SPH method is the time consuming calculations. It needs computers with strong CPU and memory. In thispaper, the influence of the time scale in a free surface flow simulation by SPH method is investigated. At first, dam break in differentgeometrical scales are simulated by SPH method. One of them is considered as hypothetical prototype and the others are reducedscale models. Then the influence of time scale is evaluated in hypothetical prototype and reduced scale models. The results show thatthe occurrence time of dam break in reduced scale model is less than other models and it’s affected to decrease calculation time inSPH. Therefore, the computer calculation time is decreased. The relations between two scales in dam break simulations indicate thatthe Froude law is valid for this case. In models with scale 3 and 6 with equal number of particles, the times of occurrence andcomputation were decreased in the order of 42% and 59%, respectively. Hence, the computer run time can be decreased when thisnew scheme is used. For validating the SPH model, the numerical results are compared with other numerical methods andexperimental data.
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