Filters








1,101 Hits in 1.9 sec

Graph Coloring and Function Simulation [article]

Amir Daneshgar, Ali Reza Rahimi, Siamak Taati
2010 arXiv   pre-print
We prove that every partial function with finite domain and range can be effectively simulated through sequential colorings of graphs. Namely, we show that given a finite set S={0,1,...,m-1} and a number n ≥{m,3}, any partial function φ:S^^p→ S^^q (i.e. it may not be defined on some elements of its domain S^^p) can be effectively (i.e. in polynomial time) transformed to a simple graph G__φ,n along with three sets of specified vertices X = {x__0,x__1,...,x__p-1}, Y = {y__0,y__1,...,y__q-1}, R =
more » ... 0,1,...,n-1}, such that any assignment σ__0: X ∪ R →{0,1,...,n-1} with σ__0(i)=i for all 0 ≤ i < n, is uniquely and effectively extendable to a proper n-coloring σ of G__φ,n for which we have φ(σ(x__0),σ(x__1),...,σ(x__p-1))=(σ(y__0),σ(y__1),...,σ(y__q-1)), unless (σ(x__0),σ(x__1),...,σ(x__p-1)) is not in the domain of φ (in which case σ__0 has no extension to a proper n-coloring of G__φ,n).
arXiv:1008.3015v1 fatcat:3ldzyst3tvhdzkvy3jksiyd4y4

Cold Pain Threshold and Role of NMDA Receptor Antagonists

Poroshat Nazemi, Amir Hossein Orandi, Amir Ali Orandi, Amir Poya Zanjani, Hossein Majedi, Mojgan Rahimi, Kasra Karvandian, Fardin Yousefshahi, Atieh Sedighian, Seyed Ali Emami
2019 Acta Medica Iranica  
Clonidine, the α2-adrenergic agonist, is usually used as an antihypertensive drug. Dextromethorphan is a non-competitive NMDA antagonist which is routinely prescribed to suppress cough. However, there are not confidential documents regarding their analgesic effects. Due to the controversies over the analgesic properties of these two drugs, this study was designed to evaluate cold pain threshold changes following their administration. This study was conducted to assess the impact of oral
more » ... e and dextromethorphan on ice-water immersion tolerance. Four closed sachets labeled with codes were dedicated to each participant. Each of these four sachets contained placebo, 0.3 mg/kg dextromethorphan, 0.2 mg clonidine or both of the previous drugs randomly. The cold pain threshold was measured five times for each participant, once before taking any drug (T1) and the next four times (T2-T5) after taking each of the four sachets. 35 volunteers (15 men and 20 women) participated in the study. The study showed that cold pain threshold was higher in men than women (P=0.004) and also in participants above 30 than those under 30-year-old (P=0.007). Moreover, the pain threshold did not change significantly after the administration of clonidine (P=0.33) or dextromethorphan (P=0.21), but the threshold significantly increased after receiving a combination of dextromethorphan and clonidine compared with placebo overall (P=0.001). Cold pain threshold was higher in men and individuals over than 30-year-old and decreased significantly after administration of clonidine and dextromethorphan conjointly. Body mass index has no relation with changes in cold pain threshold by taking mentioned medications.
doaj:fa926c94b465433b8c1366c99b1b5be9 fatcat:43m5xxzgsba57g2yeffglt2o5m

CogSense: A Cognitively Inspired Framework for Perception Adaptation [article]

Hyukseong Kwon, Amir Rahimi, Kevin G. Lee, Amit Agarwal, Rajan Bhattacharyya
2021 arXiv   pre-print
This paper proposes the CogSense system, which is inspired by sense-making cognition and perception in the mammalian brain to perform perception error detection and perception parameter adaptation using probabilistic signal temporal logic. As a specific application, a contrast-based perception adaption method is presented and validated. The proposed method evaluates perception errors using heterogeneous probe functions computed from the detected objects and subsequently solves a contrast
more » ... ation problem to correct perception errors. The CogSense probe functions utilize the characteristics of geometry, dynamics, and detected blob image quality of the objects to develop axioms in a probabilistic signal temporal logic framework. By evaluating these axioms, we can formally verify whether the detections are valid or erroneous. Further, using the CogSense axioms, we generate the probabilistic signal temporal logic-based constraints to finally solve the contrast-based optimization problem to reduce false positives and false negatives.
arXiv:2107.10456v1 fatcat:pq3vnxk5njdhdatftw75psez7q

Endothelial Nitric Oxide Synthase (eNOS) 4a/b and G894T Polymorphisms and Susceptibility to Preeclampsia

Zohreh Rahimi, Amir Aghaei, Ziba Rahimi, Asad Vaisi-Raygani
2013 Journal of reproduction & infertility  
Amir Aghaei, Kermanshah University of Medical Sciences, Kermanshah, Iran and was financially supported by a grant from Kermanshah University of Medical Sciences, Office of Vice Chancellor for Research,  ...  Rahimi Z, et al. JRI The vasodilator molecule of nitric oxide (NO) is produced from L-arginine by endothelial nitric oxide synthase (eNOS).  ... 
pmid:24551572 pmcid:PMC3911813 fatcat:2w3tmbnsvzcerkhkakqlynhqv4

Finasteride induced depression: a prospective study

Babak Rahimi-Ardabili, Ramin Pourandarjani, Peiman Habibollahi, Amir Mualeki
2006 BMC Clinical Pharmacology  
Finasteride is a competitive inhibitor of 5 alpha-reductase enzyme, and is used for treatment of benign prostatic hyperplasia and androgenetic alopecia. Animal studies have shown that finasteride might induce behavioral changes. Additionally, some cases of finasteride-induced depression have been reported in humans. The purpose of this study was to examine whether depressive symptoms or anxiety might be induced by finasteride administration. Methods: One hundred and twenty eight men with
more » ... netic alopecia, who were prescribed finasteride (1 mg/day) were enrolled in this study. Information on depressed mood and anxiety was obtained by Beck Depression Inventory (BDI), and Hospital Anxiety and Depression Scale (HADS). Participants completed BDI and HADS questionnaires before beginning the treatment and also two months after it. Results: Mean age of the subjects was 25.8(± 4.4) years. At baseline, mean BDI and HADS depression scores were 12.11(± 7.50) and 4.04(± 2.51), respectively. Finasteride treatment increased both BDI (p < 0.001) and HADS depression scores significantly (p = 0.005). HADS anxiety scores were increased, but the difference was not significant (p = 0.061). Conclusion: This preliminary study suggests that finasteride might induce depressive symptoms; therefore this medication should be prescribed cautiously for patients with high risk of depression. It seems that further studies would be necessary to determine behavioral effects of this medication in higher doses and in more susceptible patients.
doi:10.1186/1472-6904-6-7 pmid:17026771 pmcid:PMC1622749 fatcat:bks4d46nhnauhbokf3l2xga2ma

Role of tyrosine kinases in bladder cancer progression: an overview

Amir Sadra Zangouei, Amir Hossein Barjasteh, Hamid Reza Rahimi, Majid Mojarrad, Meysam Moghbeli
2020 Cell Communication and Signaling  
Bladder cancer (BCa) is a frequent urothelial malignancy with a high ratio of morbidity and mortality. Various genetic and environmental factors are involved in BCa progression. Since, majority of BCa cases are diagnosed after macroscopic clinical symptoms, it is required to find efficient markers for the early detection. Receptor tyrosine-kinases (RTKs) and non-receptor tyrosine-kinases (nRTKs) have pivotal roles in various cellular processes such as growth, migration, differentiation, and
more » ... bolism through different signaling pathways. Tyrosine-kinase deregulations are observed during tumor progressions via mutations, amplification, and chromosomal abnormalities which introduces these factors as important candidates of anti-cancer therapies. For the first time in present review we have summarized all of the reported tyrosine-kinases which have been significantly associated with the clinicopathological features of BCa patients. This review highlights the importance of tyrosine-kinases as critical markers in early detection and therapeutic purposes among BCa patients and clarifies the molecular biology of tyrosine-kinases during BCa progression and metastasis. Video abstract.
doi:10.1186/s12964-020-00625-7 pmid:32795296 fatcat:sb3xor62oneflig7a5hg4vwn4a

Systems Biomedicine of Colorectal Cancer Reveals Potential Targets for CRC treatment [article]

Mehran Piran, Mehrdad Piran, Neda Sepahi, Amir Rahimi
2020 bioRxiv   pre-print
Colorectal cancer is one of the leading causes of cancer death worldwide. Patient survival at the time of diagnosis depends largely on the stage of the tumor. Therefore, understanding the molecular mechanisms promoting cancer progression from early stages to high-grade stages is essential for therapeutic approaches. In the present study, we conducted transcriptomic data analysis employing a systems biology method to identify potential molecular targets for colorectal cancer treatment. These
more » ... ets went under investigation one by one. We proposed some genes that their expression induction or suppression alone or in combination with each other would inhibit tumor progression or metastasis based on their biological activity. They are involved in cell proliferation, energy production under hypoxic conditions, epithelial to mesenchymal transition (EMT) and angiogenesis. Employing a network analysis viewpoint, some genes were discovered that has not been reported noticeably in any kind of cancer so far. As a result, they might have some roles in progression of colorectal cancer.
doi:10.1101/2020.01.25.919415 fatcat:3efky4duxvhvznfeiur42vfcy4

The Smarandache Vertices Of The Comaximal Graph Of A Commutative Ring

ELHAM MEHDI-NEZHAD, AMIR M. RAHIMI
2018 Zenodo  
Let R be a commutative ring with identity 1 ̸= 0. Define the comaximal graph of R, denoted by CG(R), to be the graph whose vertices are the elements of R, where two distinct vertices a and b are adjacent if and only if Ra + Rb = R. A vertex a in a simple graph G is said to be a Smarandache vertex (or S-vertex for short) provided that there exist three distinct vertices x, y, and b (all different from a) in G such that a—x, a—b, and b—y are edges in G but there is no edge between x and y. The
more » ... n object of this paper is to study the S-vertices of CG(R) and CG2(R) \ J(R) (or CGJ (R) for short), where CG2(R) is the subgraph of CG(R) which consists of nonunit elements of R and J(R) is the Jacobson radical of R. There is also a discussion on a relationship between the diameter and S-vertices of CGJ(R).
doi:10.5281/zenodo.1419756 fatcat:oejthoghefey7ekkprhlaesb4m

Some Results on $n$-Stable Rings

Amir M. Rahimi
2003 Missouri Journal of Mathematical Sciences  
All rings are commutative rings with identity, and J(R) denotes the Jacobson radical of the ring R. For any fixed integer n ≥ 1, it is shown that the class of all n-stable rings is properly contained in the class of all n + 1-stable rings. Results are given showing the connection between several types of rings whose finite sequences satisfy different stability conditions, some involving J(R). It is shown that in the strongly n-stable case, it suffices to check whether the n + 1tuples satisfy
more » ... stable condition. In addition to other results and an example of a ring which is not n-stable for any integer n ≥ 1, examples are given to show the distinction between the different types of stability cases. Finally, in the last section, some surjective mapping properties of a generalized form of GL n (R) and SL n (R) in connection to some stable conditions in the ring R are investigated.
doi:10.35834/2003/1502129 fatcat:c36vfe2s5zfpbmzrfwpuu7grxy

On the Diameter and Girth of an Annihilating-Ideal Graph [article]

F. Aliniaeifard, M. Behboodi, E. Mehdi-Nezhad, Amir M. Rahimi
2014 arXiv   pre-print
A Relation Between the Smarandache Vertices, Girth, and Diameter of the Annihilating-ideal Graphs The concept of a Smarandache vertex in a (simple) graph was first introduced by Rahimi [13] in order  ... 
arXiv:1411.4163v1 fatcat:ye2dnyccr5aydpuhhydyczqm4y

A computer terminal with synthetic speech output

Morteza Amir Rahimi, John Bryson Eulenberg
1974 Behavior Research Methods  
The hardware configuration and software for a voice-output communications station are described. Advantages of such a capability in computer-aided instruction and as an aid for the visually handicapped are noted. The man-computer communication station incorporates a relatively inexpensive digitally controlled voice synthesizer.
doi:10.3758/bf03200339 fatcat:kkhzj53upfaxdmmlc3u6ghw6qq

A review on COVID-19 forecasting models

Iman Rahimi, Fang Chen, Amir H. Gandomi
2021 Neural computing & applications (Print)  
sets [72]Compartmental models (SIR, SEIR, SIRD, etc.)Predict how the disease spreads Present the effects of public health interventions on the outcome of the pandemic [74] [75] [76] [77] [78] & Amir  ... 
doi:10.1007/s00521-020-05626-8 pmid:33564213 pmcid:PMC7861008 fatcat:zvt73vlm2fhuzbgp72lujmbfwe

Calibration of Neural Networks using Splines [article]

Kartik Gupta, Amir Rahimi, Thalaiyasingam Ajanthan, Thomas Mensink, Cristian Sminchisescu, Richard Hartley
2021 arXiv   pre-print
Calibrating neural networks is of utmost importance when employing them in safety-critical applications where the downstream decision making depends on the predicted probabilities. Measuring calibration error amounts to comparing two empirical distributions. In this work, we introduce a binning-free calibration measure inspired by the classical Kolmogorov-Smirnov (KS) statistical test in which the main idea is to compare the respective cumulative probability distributions. From this, by
more » ... ating the empirical cumulative distribution using a differentiable function via splines, we obtain a recalibration function, which maps the network outputs to actual (calibrated) class assignment probabilities. The spine-fitting is performed using a held-out calibration set and the obtained recalibration function is evaluated on an unseen test set. We tested our method against existing calibration approaches on various image classification datasets and our spline-based recalibration approach consistently outperforms existing methods on KS error as well as other commonly used calibration measures. Our Code is available at https://github.com/kartikgupta-at-anu/spline-calibration.
arXiv:2006.12800v2 fatcat:awg3mjudvnckngjhbcspraka6q

Designing a model for the development of physical education in police organization

ALIREZA RAHIMI, SAEID GHORBANI, Amir Dana
2021 Zenodo  
and Aim: The complexity and diversity of law enforcement missions requires that police officers be highly prepared and physically able to successfully carry out their assigned missions in order to ensure the security of citizens. The purpose of this study is to design a model for the development of physical education in police organization. Method: This research is a qualitative research in terms of applied purpose, exploratory research in terms of method and data type. The population and the
more » ... atistical sample of the study included 15 police sports experts and university faculty members who were selected by purposive sampling. The data collection tool is a semi-structured interview based on foundation data theory. Validity, transferability, reliability and verification methods were used to confirm the validity. Reliability was calculated by Holste method 0. 87 which was confirmed. In the present study, Max Kyoda qualitative data analysis software was used for qualitative content analysis, for open, axial and selective coding. Findings: Based on the research findings, causal factors are seven factors (management of physical education, educational facilities and equipment, research, budget and finance, executive agents and individuals, evaluation and feedback, and public relations), in the contextual section of three factors ( Managerial, educational learners, instructors and trainers), in the intervention section, three factors (lack of facilities and equipment, the nature of physical education and human and financial resources), in the strategies section, three sections (at individual, intermediate and macro levels) Finally, in the outcomes section, 4 main categories were identified (development of police physical training, increasing the motivation of teachers and trainers, increasing productivity in police missions, institutionalizing sports culture in the police). Conclusion: The results showed that management factors, training facilities and equipment, research, budget and finance, executive agent [...]
doi:10.5281/zenodo.6373535 fatcat:zmtvm7mjqfa6zjr5mut5cfn5m4

On The Diameter And Girth Of An Annihilating-Ideal Graph

F. Aliniaeifard, M. Behboodi, E. Mehdi-Nezhad, Amir M. Rahimi
2014 Zenodo  
A Relation Between the Smarandache Vertices, Girth, and Diameter of the Annihilating-ideal Graphs The concept of a Smarandache vertex in a (simple) graph was first introduced by Rahimi [13] in order  ... 
doi:10.5281/zenodo.32320 fatcat:6hyykofcgfag5eezjnjcbevs3q
« Previous Showing results 1 — 15 out of 1,101 results