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Palacios-Quinonero F.,University Polite | Rossell J.M.,University Polite | Rodellar J.,University Polite | Karimi H.R.,University of Adger
Proceedings of the American Control Conference | Year: 2011

In this paper, a control strategy to mitigate the vibrational response of adjacent buildings under seismic excitation is presented. The proposed strategy combines inter-building passive actuators with active actuators placed in the building stories. The main ideas are presented by means of a simplified two-building model; however, a semi-decentralized overlapping approach via the inclusion principle has been used to impose a proper information exchange structure suitable for wireless control of large buildings. Numerical simulations have been carried out to assess the performance of the proposed methodology with promising results. The overall control system exhibits some degree of fault-tolerance since only partial degradation of the control performance results from partial failures of the control system. © 2011 AACC American Automatic Control Council. Source


Palacios-Quinonero F.,Polytechnic University of Catalonia | Rossell J.M.,Polytechnic University of Catalonia | Rodellar J.,Polytechnic University of Catalonia | Karimi H.R.,University of Adger
IFAC Proceedings Volumes (IFAC-PapersOnline) | Year: 2011

In this paper, a control strategy to reduce the vibrational response of adjacent buildings under seismic excitation is presented. The proposed strategy combines passive linking elements with an active decentralized H∞ control system. The overall active-passive control system admits decentralized design and operation, and achieves an excellent vibrational reduction when the active control system works; in case of a full or partial failure of the active control system, a remarkable reduction in the vibrational response is guaranteed by the passive linking elements. For adjacent buildings that require different levels of seismic protection, the implementation of an active H∞ control system in just one of the buildings is also considered. The main ideas are presented by means of a simplified two-building model. Numerical simulations have been carried out to assess the performance of the proposed methodology with promising results. © 2011 IFAC. Source


Kirkevold O.,Norwegian Center for Dementia Research | Kirkevold O.,University of Adger | Engedal K.,University of Oslo
International Journal of Nursing Practice | Year: 2010

This study aims to map out to what degree medication is being crushed and mixed into the patients' food and beverages and how often this practice included medication, which has a statement in the Norwegian pharmaceutical compendium that this should not be done (inappropriately altered medication (IAM)). Data from a total of 2108 patients in 151 wards in 65 nursing homes were collected. The data contained information about the kind of drugs the patient received, in which form it was given and how it was given. Patient characteristics and ward characteristics were also recorded. Twenty-three per cent were given at least one drug mixed into their food or beverages and 10% were given at least one IAM. This study shows a malpractice regarding one aspect of medication in nursing homes. Even though we need more knowledge, we know enough to take action to raise the quality of the administration of medicines in nursing homes. © 2010 Blackwell Publishing Asia Pty Ltd. Source


Hartarska V.,Auburn University | Nadolnyak D.,Auburn University | Mersland R.,University of Adger
American Journal of Agricultural Economics | Year: 2014

Microfinance Institutions (MFIs) provide financial services to the poor and in many ways resemble both banks and non-profit organizations. Many MFIs target women because more women than men are poor, especially in rural areas. Studies show that women manage money differently from men and have different leadership styles. Thus, in credit unions and financial firms, female and male managers achieve different results. In microfinance, gender diversity on the board of MFIs is beneficial, and loans authorized by female loan officers have lower default rates. Motivated by these findings, we ask whether MFIs with a female Chief Executive Officer (CEO) are more efficient at serving the poor without jeopardizing financial sustainability. We adapt the banking approach to managerial (in)efficiency to account for the outreach and sustainability goals of the MFIs, and evaluate whether MFIs' outreach efficiency differs by the gender of their respective CEOs. We estimate a stochastic frontier cost function using the Battese-Coelli (1995) model and the "true" random effects estimators using panel data from over 250 MFIs. We find that MFIs with female CEOs have significantly higher outreach efficiency than MFIs with male CEOs. Similar results are found with a two-step stochastic frontier approach. Overall, the results suggest that promoting gender diversity at the top levels of MFI management is likely to have both social and financial benefits. © The Author (2014). Source


Djokoto S.S.,University of Adger | Karimi H.R.,University of Adger
Recent Researches in Geography, Geology, Energy, Environment and Biomedicine - Proc. of the 4th WSEAS Int. Conf. on EMESEG'11, 2nd Int. Conf. on WORLD-GEO'11, 5th Int. Conf. on EDEB'11 | Year: 2011

This paper describes the modeling, simulation and the instrumentation of High Pressure Roller Crusher (HPRC) for the production of silicon carbide grains. The study is to make a model and then simulate a High Pressure Roller Crusher. Selection of sensors for the HPRC is also important in this study. A High Pressure Roller Crusher (HPRC) is an important part in the production of silicon carbide, where the grains are crushed into powder form and then sieved into specified sizes based on its usage. This paper will present a model based on Johanson's theory for roller compactors, considering all the delays. The non-linearity or delays were handled in matlab using. Conclusions were drawn at end of the paper. Source

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