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Abbas Mahmood Oghor Anwer,Fuad Alhaj Omar,Ahmet Afsin Kulaksiz 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
The permanent magnet synchronous motors (PMSM) are widely employed in industrial, robotic, water pumping and HVAC applications due to their numerous benefits such as small size, high-energy efficiency, high performance, low inertia and the ability to operate in full load at low speeds. In case the PMSM drive system is supplied from photovoltaic (PV) modules, it can be a perfect match for water pumping or HVAC applications. In such a system, in order to extract full energy from PV modules, a maximum power point tracking (MPPT) algorithm must be employed. This article presents a PV system-fed PMSM drive system with sensorless speed control. The proposed system consists of two main parts. The first part deals with MPPT algorithm based on fuzzy logic controller and the second part deals with PMSM drive system with a sensorless speed estimator by using Model Reference Adaptive System (MRAS) approach to eliminate the use of an encoder. The operation of PMSM is accomplished by using the vector control method to obtain a similar dynamic of the DC motor. The overall system is modelled in Matlab/Simulink environment and simulation results are collected under various operating conditions.
Evaluation of chaperone ability of S. rosmarinus against protein aggregation
Abbas Heidari,Arezou Ghahghaei,Jafar Valizadeh 한국약제학회 2014 Journal of Pharmaceutical Investigation Vol.44 No.6
Protein aggregation occurs via a process inwhich unnatural molecules connect together and createsoluble small oligomers or insoluble aggregations. Theaggregation of protein depends on resistance conformationand the colloidal characteristics of proteins. Finding properways to stabilize or prevent of protein aggregation could beimportant for the control of such diseases as Alzheimer’sand Parkinson’s. Seidlitzia rosmarinus (S. rosmarinus)extract has antioxidant compounds which can cause anincrease in protein resistance and prevent protein aggregation. The aim of this study is to assess the chaperoneeffects of compounds in S. rosmarinus extract on proteinaggregation. In this research, the chaperone property of S. rosmarinus extract was evaluated on ovotransferin, insulin,and a-lactalbumin aggregation, using visible light spectroscopy,florescence and circular dichroism spectroscopy. The results indicate that the extract of S. rosmarinus couldprevent protein aggregation in a concentration-dependentmanner. The protective effect of S. rosmarinus, however,differed among the three proteins due to their differenthydrophobic surface areas.
A Cost/Worth Approach to Evaluate UPFC Impact on ATC
Abbas Rajabi-Ghahnavieh,Mahmud Fotuhi-Firuzabad,Mohammad Shahidehpour,Rene Feuillet 대한전기학회 2010 Journal of Electrical Engineering & Technology Vol.5 No.3
Available transfer capability (ATC) is a measure of the transfer capability remaining in a transmission system. Application of unified power flow controllers (UPFCs) could have positive impacts on the ATC of some paths while it might have a negative impact on the ATC of other paths. This paper presents an approach to evaluate the impacts of UPFCs on the ATC from a cost/worth point of view. The UPFC application worth is considered as the maximum cost saving in enhancing the ATC of the paths due to the UPFC implementation. The cost saving is considered as the cost of optimal application of other system reinforcement alternatives (except for UPFC) to reach the same ATC level obtained by UPFC application. UPFC application costs include the maximum cost of alleviating the probable negative impact on the ATC of some paths caused by implementing UPFCs. Optimal system reinforcement is used for systems with UPFCs to determine the aforementioned cost. The proposed method is applied to the IEEERTS and the results are evaluated through a sensitivity analysis. The cost/worth of UPFC application is also used to develop an index for optimal UPFC location and the results are compared with those of other indices. A comparison is finally made with the results obtained using an existing ATC allocation profit-based approach to determine UPFC application worth.
Meta-synthesis of COVID-19 lessons: charting sustainable management of future pandemics
Abbas Ziafati Bafarasat 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.3
Development of the COVID-19 vaccines has been creating a lot of hope for an ultimate return to normality, but returning to normality as we had before would mean we will continue to ignore life-ravaging lessons, as we did for severe acute respiratory syndrome, Ebola, and Middle East respiratory syndrome. This meta-synthesis of COVID-19 lessons charts sustainable pandemic management in terms of choosing strategies that are situated in their contextual specifications and beginning preparations for future application of such strategies from now. To guide selection of a situated strategy, the paper provides a comprehensive list of epidemiological determinants (e.g. communicativeness, poverty, supply chain, density, wind, remoteness); consolidates knowledge about strategies of elimination, suppression and mitigation; and proposes a quantified SWOT analysis of epidemiological determinants that produces coordinates for strategy identification in a Cartesian plane divided into twelve strategy quarters. To guide prior preparations for future application of pandemic management strategies, the paper consolidates lessons learned in implementation of situated strategies and proposes preparations at the national level for elimination, at the local/community level for suppression, and at the regional level for mitigation.