3,797 research outputs found
Behrooz File System (BFS)
No full textIn this thesis, the Behrooz File System (BFS) is presented, which provides an in-memory distributed file system. BFS is a simple design which combines the best of in-memory and remote file systems. BFS stores data in the main memory of commodity servers and provides a shared unified file system view over them. BFS utilizes backend storage to provide persistency and availability. Unlike most existing distributed in-memory storage systems, BFS supports a general purpose POSIX-like file interface. BFS is built by grouping multiple servers’ memory together; therefore, if applications and BFS servers are co-located, BFS is a highly efficient design because this architecture minimizes inter-node communication. This pattern is common in distributed computing environments and data analytics applications. A set of microbenchmarks and SPEC SFS 2014 benchmark are used to evaluate different aspects of BFS, such as throughput, reliability, and scalability. The evaluation results indicate the simple design of BFS is successful in delivering the expected performance, while certain workloads reveal limitations of BFS in handling a large number of files. Addressing these limitations, as well as other potential improvements, are considered as future work
Behrooz Mahmoodi Bakhtiari, Tense in Persian. Its Nature and Use
No full textRecensione a : Tense in Persian : its nature and use / Behrooz Mahmoodi Bakhtiari. LINCOM Europa, 2002
Essays on typology of Iranian Languages Trends in linguistics., 328./ Alireza Korangy, Behrooz Mahmoodi-Bakhtiari.
No full textIn English.Includes bibliographical references and index.The Iranian languages are one of the world's major language families. With an estimated 150 to 200 million native speakers, these languages constitute the western group of the larger Indo-Iranian family, which represents a major eastern branch of the Indo-European languages. Geographically, the Iranian Languages are spoken from Central Turkey, Syria and Iraq in the West to Pakistan and western edged of Xinjiang Uygur Autonomous Region of China in the east. Iranian languages have long been among the major interests of the philologists and general linguists, and European scholars have made tremendous contributions to the study of this language family. In light of such efforts, now we know that the Iranian languages can be historically divided into three phases, that are old, middle and new Iranian languages, and the new Iranian languages may be generally grouped as Eastern and Western. In recent years, the orientation towards typology has led to the appearance of somewhat more ponderance on the subject but the work has not included description of some of the very important languages of the Caspian, and or of the religious minorities (such as those of the Zoroastrians or the Jewish community), of the four-fold Central Plateau dial.Comrie, Bernard -- Scheucher, Bernhard -- Lazard, Gilbert -- Stilo, Donald -- Borjian, Habib -- Haig, Geoffrey / Adibifar, Shirin -- Gadilia, Ketevani -- Völlmin, Sascha -- Mahmoodi-Bakhtiari, Behrooz / Rezai-Baghbidi, Hassan -- Eilam, Thamar -- Korangy, Alireza -- Frontmatter -- Acknowledgments -- Contents -- Iranian languages and linguistic typology / Ergativity in New West Iranian / Aspect in Iranian two systems: Persian and Pashto / Loss vs. expansion of gender in Tatic languages: Kafteji (Kabatei) and Kelāsi / Mazandarani: A typological survey / Referential Null Subjects (RNS) in colloquial spoken Persian: Does speaker familiarity have an impact? / A typological study of (in)definiteness in the Iranian languages / The quotative marker in Gilaki / Plural marking in the New West Iranian languages and dialects: a historical and typological approach / A typological sketch of the Jewish Iranian dialects / Epilogue / Index1 online resource (vii, 183 pages
Mapping Middle-earth : Environmental and Political Narratives in J.R. R. Tolkien’s Cartographies (2024) by Anahit Behrooz
No full textThe force driving Anahit Behrooz’s Mapping Middle-earth is a desire todemonstrate that J. R. R. Tolkien’s work deserves to be taken (more) seriouslyin the field of literary studies. The author argues this case by relating maps,mapping, and cartography – within and outside the story world – to a handfulof critical perspectives that currently enjoy certain appeal both within themainstream and among fantasy scholars. And should the book fail to convincesome hobbitophobic critics out there, the fault does not seem to lie either withTolkien’s work or Behrooz discussions of it but with the fact that fantasy(including Tolkien) require more of its analytical tools than some mainstreamcritical perspectives offer when taken off the rack
Author Correction: A comparative study of the local effect of tranexamic acid and phenylephrine on the amount of bleeding in rhinoplasty: A randomized clinical trial
No full textAfter the publication of the article titled “A Comparative Study of the Local Effect of Tranexamic Acid and Phenylephrine on the Amount of Bleeding in Rhinoplasty: A Randomized Clinical Trial”, it was noticed that the name of Behrooz Gandomi had been omitted from the list of contributors. The authors’ names and affiliations have now been corrected accordingly.
The Original Article was published on 7 Sep 2024.
Published: 20 Oct 202
Metastatic outgrowth via the two-way interplay of autophagy and metabolism
No full textMetastasis represents one of the most dangerous issue of cancer progression, characterized by intricate interactions between invading tumor cells, various proteins, and other cells on the way towards target sites. Tumor cells, while undergoing metastasis, engage in dynamic dialogues with stromal cells and undertake epithelial-mesenchymal transition (EMT) phenoconversion. To ensure survival, tumor cells employ several strategies such as restructuring their metabolic needs to adapt to the alterations of the microenvironmental resources via different mechanisms including macroautophagy (autophagy) and to circumvent anoikis-a form of cell death induced upon detachment from the extracellular matrix (ECM). This review focuses on the puzzling connections of autophagy and energetic metabolism within the context of cancer metastasis
Some remarks on the homology of nilpotent groups
No full textIn this article we study the homology of nilpotent groups. In particular a
certain vanishing result for the homology and cohomology of nilpotent groups is
proved.Comment: 9 pages, Late
Gradient Thermoviscoelasticity based on Irreversible Thermodynamics
No full textOggigiorno i risonatori costituiscono una parte importante delle tecnologie avanzate come i sistemi
microelettromeccanici e nanoelettromeccanici (MEMS, NEMS). Sono impiegati ad esempio come attuatori o microsensori di alta precisione, così come nella microscopia a forza atomica e nei semiconduttori. I micro e nanorisonatori mostrano una perdita di sensibilità a causa della dissipazione interna dell'energia. È noto che il meccanismo responsabile della perdita di energia è lo smorzamento termoelastico in cui i campi termici e meccanici sono accoppiati.
In questo tipo di smorzamento, la deformazione meccanica fa sì che i gradienti di temperatura si verifichino dalle aree compresse verso le regioni tese del microbeam. Un sistema che si trova in uno stato di non equilibrio cerca di ritrovare il suo equilibrio attraverso la produzione di calore. Tuttavia è un processo irreversibile che accompagna la produzione di entropia e alla fine porta alla dissipazione di energia.
Come si può vedere il processo di smorzamento termoelastico è un fenomeno complesso che
coinvolge l'interazione di meccanica e termodinamica irreversibili. Questa complessità aumenta quando
notiamo che sono state registrate discrepanze significative tra le osservazioni sperimentali e le previsioni teoriche/computazionali. È noto che un importante inibitore per il raggiungimento di precisioni più elevate è l'incapacità delle teorie del continuo classico nel descrivere i campi meccanici su piccola scala come micro e nanometri. Teorie più recenti, tuttavia, come l'elasticità a gradiente sono emerse per soddisfare l’esigenza di descrizione più accurata dei comportamenti dei materiali avanzati.
Questo studio mira a fornire una descrizione e una comprensione più accurate del fenomeno dello smorzamento termoelastico. La complessità di questo fenomeno su piccola scala è risolta attraverso l'incorporazione delle teorie a gradiente (gradienti di sforzo e deformazione in particolare) nel modello classico di termoviscoelasticità sulla base della termodinamica irreversibile.
Pertanto, in questa tesi, le teorie della termodinamica irreversibile, dell'elasticità a gradiente, della viscoelasticità e dello smorzamento termoelastico sono state studiate nei capitoli da 1 a 4. Quindi nel capitolo 5 è stata sviluppata la teoria della termoviscoelasticità a gradiente sulla base dei principi spiegati nei capitoli precedenti. In questo capitolo viene dapprima stabilito il quadro termodinamico generale, quindi vengono sviluppati i modelli costitutivi sia per il gradiente di sforzo che per il gradiente di deformazione. Sono stati ricavati diversi funzionali energetici per ciascuno dei modelli, ciascuno dei quali è funzione di sforzo, deformazione e gradienti di sforzo e deformazione. Diverse tecniche e teoremi matematici come gli integrali biconvolutivi di Stieltjes e la teoria reciproca di Onsager sono stati impiegati. Alla fine le relazioni costitutive per le parti dissipative nella produzione di entropia sono state formulate in forma matriciale. Infine, nel capitolo 6 di questa tesi sono state presentate le conclusioni insieme a suggerimenti per lavori futuri.Nowadays resonators constitute an important part of advanced technologies such as
Micro-electromechanical and Nano-electromechanical systems (MEMS, NEMS). They are
employed for instance as high precision actuators or micro-sensors, as well as in atomic
force microscopy and semiconductors. Micro- and nanoresonators exhibit loss of sensitivity
as a result of internal energy dissipation. The responsible mechanism for energy loss is
known to be of thermoelastic damping there thermal and mechanical fields are coupled.
In this type of damping, mechanical deformation causes temperature gradients happen
from compressed areas toward stretched regions of microbeam. System which is in non-
equilibrium state seeks to regain its equilibrium though exertion of heat. However it is
an irreversible process which accompanies production of entropy and ultimately leads to
dissipation of energy.
As can be seen the process of thermoelastic damping is a complex phenomenon which
involves the interplay of mechanics and irreversible thermodynamics. This complexity
is escalated when we notice that significant discrepancies have been recorded between
experimental observations and theoretical/computational predictions. A major inhibitor
for achieving higher accuracies is known to be incapability of classical continuum theories
in describing mechanical fields at tiny scales such as micro- and nanometers. More recent
theories, however, such as gradient elasticity have been emerged to fulfill such a need to
more resolved description of advanced materials behaviors.
This study aims to provide a more accurate description and understanding toward
the phenomenon of thermoelastic damping. The complexity of this phenomenon at small
scales is resolved through incorporation of gradient theories (stress and strain gradients
in particular) into the classical thermoviscoelasticity model on the ground of irreversible
thermodynamics.
Thereby in this thesis theories irreversible thermodynamics, gradient elasticity along-
side viscoelasticity and thermoelastic damping have been studied through chapters 1 to 4.
Then in chapter 5 the theory of gradient thermoviscoelasticity has been developed based
on the principles explained in previous chapters. In this chapter first the general thermo-
dynamic framework has been established, then constitutive models for both stress gradient
and strain gradient materials are developed. Different energy functional for each of the
models have been postulated each of which are functions of stress, strain and gradients
of stress and strain. Different mathematical techniques and theorems such as Stieltjes bi-
convolutive integrals and Onsager’s reciprocal theory have been employed throughout the
development process. At the end constitutive relations for dissipative parties in entropy
production have been formulated in a matrix-vector form. Finally in chapter 6 of this
thesis conclusions along with suggestions for future works have been presented
supplementary_material_Table_ – Supplemental material for Serum Level of Total Lipids and Telomere Length in the Male Population: A Cross-Sectional Study
No full textSupplemental material, supplementary_material_Table_ for Serum Level of Total Lipids and Telomere Length in the Male Population: A Cross-Sectional Study by Behrooz Karimi, Masud Yunesian, Ramin Nabizadeh and Parvin Mehdipour in American Journal of Men’s Health</p
Finite Block-Length Analysis of the Incremental Redundancy HARQ
No full textThis letter studies the power-limited throughput of a communication system utilizing incremental redundancy (INR) hybrid automatic repeat request (HARQ). We use some recent results on the achievable rates of finite-length codes to analyze the system performance. With codewords of finite length, we derive closed-form expressions for the outage probabilities of INR HARQ and study the throughput in the cases with variable-length coding. Moreover, we evaluate the effect of feedback delay on the throughput and derive sufficient conditions for the usefulness of the HARQ protocols, in terms of power-limited throughput. The results show that, for a large range of HARQ feedback delays, the throughput is increased by finite-length coding INR HARQ, if the sub-codeword lengths are properly adapted
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