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Search Results: 1 - 10 of 1684 matches for " Mohsen Horri "
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Correlation Between Upper Airways Obstructive Indexes in Adenotonsilar Hypertrophy with Mean Pulmonary Arterial Pressure
Ehsan Khadivi,Mohsen Horri,Monavar Afzal Aghaee,bolfazl Taheri
Iranian Journal of Otorhinolaryngology , 2010,
Abstract: Introduction: Hypertrophied tonsils and adenoids may cause upper airway obstruction and cardio-pulmonary complications due to pulmonary arterial hypertension. The aim of this study was to determine the correlation between mean pulmonary arterial pressure (mPAP) and selected adenotonsilar hypertrophy indexes. Materials and Methods: Thirty two patients with upper-airway obstruction resulting from hypertrophied tonsils and adenoids were included in our study. Mean pulmonary arterial pressure was measured by a non-invasive method using color doppler echocardiography. Upper airway obstruction was evaluated by clinical OSA (obstructive sleep apnea) scoring and also adenoidal-nasopharyngeal (A/N) ratio in the lateral neck radiography. Results: Fifty percent of the patients with a normal OSA score, 20% of those with a suspected OSA score and also 50% of cases with OSA had pulmonary hypertension (mPAP>20mmHg) which was not statistically significant (P=0.198). Mean Adenoidal-nasopharyngeal ratio in patients with a normal mPAP (mPAP≤20mmHg) was 0.61±0.048 and it was 0.75±0.09 in those with pulmonary hypertension; the difference was statistically significant (P=0.016). Conclusion: It seems that A/N ratio could be used as a predicting factor for increased mPAP in children with upper airway obstruction and a pediatric cardiologist consultation may be necessary before some surgical interventions.
An empirical study on the effects of different factors on knowledge management systems
Parviz Khadem,Rahmatollah Jadidi,Mohammad Sadegh Horri
Management Science Letters , 2013, DOI: 10.5267/j.msl.2013.04.025
Abstract: Knowledge management plays an essential role on achieving business success and it is considered as intangible attests for many organizations. In fact, many people believe intangible assets are the most influential part of any firm’s investment. This paper investigates the relationships among four variables including empowering leadership, task technology fit, compatibility and knowledge management system (KMS). The study considers whether there is any positive relationship between empowering leadership and task technology fit, between empowering leadership and compatibility, between task technology fit and KMS usage and between compatibility and KMS usage. The survey selects a sample of 215 people from the regular employees as well as university professors of Islamic research center of Qom province, Iran. We have distributed 220 questionnaires and collected 160 for the investigation. The results of this survey indicate that there is a meaningful and positive relationship between empowering leadership and compatibility (0.72, t-student=4.01), a meaningful and positive relationship between empowering leadership and compatibility (0.80, t-student=4.64), a positive and meaningful relationship between task technology fit and KMS usage (0.72, t-student=3.58) and finally there is a positive and meaningful relationship between compatibility and KMS usage (0.43, t-student=2.78).
Multiple Periodic Solutions for Some Classes of First-Order Hamiltonian Systems  [PDF]
Mohsen Timoumi
Applied Mathematics (AM) , 2011, DOI: 10.4236/am.2011.27114
Abstract: Considering a decomposition R2N=A⊕B of R2N , we prove in this work, the existence of at least (1+dimA) geometrically distinct periodic solutions for the first-order Hamiltonian system Jx'(t)+H'(t,x(t))+e(t)=0 when the Hamiltonian H(t,u+v) is periodic in (t,u) and its growth at infinity in v is at most like or faster than |v|a, 0≤a<1 , and e is a forcing term. For the proof, we use the Least Action Principle and a Generalized Saddle Point Theorem.
Corrosion effect on the flexural strength & micro-hardness of ips e-max ceramics  [PDF]
Cherif Mohsen
Open Journal of Stomatology (OJST) , 2011, DOI: 10.4236/ojst.2011.12006
Abstract: Objectives: The effect of ceramics construction (press- able, machinable) and corrosion on flexural strength and micro-hardness was studied. Materials & Methods: Two types of ceramics were tested: IPS e-max Press and IPS e-max CAD. Forty samples were constructed and divided into 2 groups according to the type of ceramics. Each group was then subdivided into 2 subgroups. Subgroups 1 were not subjected to corrosion while subgroups 2 were subjected to corro-sion test. Finally each subgroup was divided into 2 classes according to the type of test: biaxial flexural strength, micro-hardness. Results: There was a sig-nificant difference between the two tested ceramics as regard weight loss as IPS e-max CAD recorded less weight loss than IPS e-max Press. As regard the flex-ural strength, IPS e-max CAD recorded significant higher strength than IPS e-max Press. Corroded sam- ples recorded significant lower flexural strength than non-corroded samples for the two tested ceramics. As regard the Vickers micro-hardness test, the results showed significant difference between the two tested ceramics. IPS e-max CAD recorded higher mi-cro-hardness values than IPS e-max Press. The results also showed that the corroded samples recorded no significant micro-hardness values than non- corroded samples for the two tested ceramics. Conclusions: IPS e-max CAD recorded less weight loss weight loss after being subjected to corrosion test than IPS e-max Press. The method of fabrication affected the flexural strength µ-hardness of ceramic as machinable ceramic (e-max CAD) recorded significant higher data than pressable ceramic (e-mas Press). Corrosion decreased the flexural strength of both tested ceramics but had no effect on micro- hardness.
Using Intelligent Computational Methods for Optimizing Niching Method  [PDF]
Mohsen Jahanshahi
International Journal of Intelligence Science (IJIS) , 2011, DOI: 10.4236/ijis.2011.11001
Abstract: Optimization implies the minimization or maximization of an objective function. Some problems have sev-eral optimum points which all, should be computed. Niching method is presented to do so. However, its efficiency can be improved via combining it with Memetic algorithm. Therefore, in this paper, Memetic method is used to improve this method in terms of convergence rate and diversity. In the proposed methods, genetic algorithm, PSO, and learning automata are used as a local search algorithm of Memetic method. The result of simulations demonstrates that proposed methods are more effective compared with Niching in terms of convergence and diversity.
Vertical marginal gap & retention of ceramic full coverage & inlay retained ceramic fixed partial dentures  [PDF]
Cherif Mohsen
Open Journal of Stomatology (OJST) , 2011, DOI: 10.4236/ojst.2011.14021
Abstract: Objectives: A comparison study between ceramic full coverage FPDs & 3 designs of ceramic inlay retained FPDs regarding vertical marginal gap & retention. Materials & Methods: Twenty samples were construc- ted and divided into 4 groups according to the type of restorations: full coverage, inlay-shaped (occluso-pro- ximal inlay + proximal box), tub-shaped (occluso-pro- ximal inlay), and proximal box-shaped FPDs. All samples were subjected to a vertical marginal gap measurements followed by a retention test. Results: The vertical marginal gap data showed no significant difference between full coverage FPDs, the tub-shap- ed inlay retained FPDs and the proximal box-shaped inlay retained FPDs. While there was a difference between these three designs and the inlay retained FPDs. Regarding retention, the full coverage FPDs recorded higher retentive strengths and was signifi-cant difference than all inlay retained FPDs designs tested. The inlay-shaped design was significant dif-ference than the other two inlay retained FPDs de-signs. Conclusions: There was no significant differ- ence between full coverage FPDs, tub-shaped & pro- ximal box shaped inlay retained FPDs as regard ver- tical marginal discrepancies. While, the inlay-haped design showed the highest vertical marginal discrep- ancies. The premolar & molar retainers for the same type of restorations showed no difference in vertical marginal discrepancies. All measured vertical mar- ginal discrepancies were in the range of clinical ac- ceptance. The full coverage FPDs recorded higher retentive strengths than all inlay retained FPDs de- signs tested. The inlay-shaped design recorded the highest retentive strengths among the three inlay re- tained FPDs designs. There was no difference as re- gard retentive strengths between tub-shaped & pro- ximal box shaped inlay retained FPDs.
Electromagnetic Radiation Reaction and Stability of the Hydrogen-Like Atoms  [PDF]
Mohsen Dehghani
Journal of Modern Physics (JMP) , 2011, DOI: 10.4236/jmp.2011.211174
Abstract: Based on a suitable linear combination of the physical and un-physical electromagnetic potentials, the radiation reaction potentials have been calculated. Through the near zone expansion of the potentials, it has been shown that in either of the relativistic and non-relativistic cases the outgoing (radiated) energy of the electrons orbiting the nucleus is substituted by incoming (electromagnetic radiation reaction) energy. This means that energy is conserved and the classical hydrogen-like atoms are stable.
Optimal Redundancy Allocation in Hierarchical Series-Parallel Systems Using Mixed Integer Programming  [PDF]
Mohsen Ziaee
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.41014

Reliability optimization plays an important role in design, operation and management of the industrial systems. System reliability can be easily enhanced by improving the reliability of unreliable components and/or by using redundant configuration with subsystems/components in parallel. Redundancy Allocation Problem (RAP) was studied in this research. A mixed integer programming model was proposed to solve the problem, which considers simultaneously two objectives under several resource constraints. The model is only for the hierarchical series-parallel systems in which the elements of any subset of subsystems or components are connected in series or parallel and constitute a larger subsystem or total system. At the end of the study, the performance of the proposed approach was evaluated by a numerical example.

Additive Manufacturing: The Most Promising Technology to Alter the Supply Chain and Logistics  [PDF]
Mohsen Attaran
Journal of Service Science and Management (JSSM) , 2017, DOI: 10.4236/jssm.2017.103017
To compete in a global economy, manufacturers are forced to move towards low volume production of innovative and customized products with high added value. Three-dimensional printing, also known as additive manufacturing (AM) or rapid prototyping enables and facilitates production of moderate to mass quantities of products that can be individually customized. The technology is truly innovative with endless product design possibilities and potential to enhance global supply chain capabilities. The technology improves efficiencies of the entire supply chain, from the cost of distribution to assembly and carry, all the way to the component itself. This article reviews evolution of new supply chain models, examines some of the potential benefits of AM in challenging traditional manufacturing constraints, explores its impact on the traditional and global supply chain and logistics, and investigates its transformative potential and its impact on various industry segments.
Mapping Scheme of Traditional Iranian Medicine Cluster’s Crotch in the Structure of Metathesaurus of Unified Medical Language System (UMLS)
A Valinejadi,F Azadeh,A Horri,MR Shams Ardekani
Payavard Salamat , 2008,
Abstract: Background & Aim: Unified Medical Language System (UMLS) is an extensive ontology of biomedical knowledge developed and maintained by U.S. National Library of Medicine (NLM). Traditional Iranian Medicine (TIM) does not have any position in the structure of metathesaurus of UMLS. The main aim of this study was designing a scheme of TIM cluster's crotch mapping in the structure of metathesaurus of UMLS. Moreover, the TIM position and its proportion in the domain of vocabulary and concepts of universal medical knowledge was another aim of this study.Materials and Methods: System analysis was the method of this study. To investigate structure of UMLS metathesaurus, and to survey lacking of TIM cluster's crotch, we applied UMLS Knowledge Source (KS) by using inductive, deductive, inductive-deductive approaches.Results: One Concept Unique Identifier (CUI); two synonym terms with Lexical Unique Identifier (LUI), L0025131 and L6330122; two ancestor and parent concept; nine concepts which with TIM crotch were the child concepts of two ancestor and parent; eighteen sibling concepts; six narrower; and five other related found concepts were identified for the proposal TIM crotch mapping in metathesaurus of UMLS. In addition, we found the "Biomedical Occupation or Discipline" semantic type assigned to it.Conclusions: Current domain of metathesaurus of UMLS does not represent complete and formal domain and position of TIM. Therefore, this metathesaurus needs to depict a domain and position for TIM.
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