EVOLUTION AND MONOTONICITY FOR A CLASS OF QUANTITIES ALONG THE RICCI-BOURGUIGNON FLOW

Daneshvar, Farzad,Razavi, Asadollah Korean Mathematical Society 2019 대한수학회지 Vol.56 No.6

In this paper we consider the monotonicity of the lowest constant ${\lambda}_a^b(g)$ under the Ricci-Bourguignon flow and the normalized Ricci-Bourguignon flow such that the equation $$-{\Delta}u+au\;{\log}\;u+bRu={\lambda}_a^b(g)u$$ with ${\int}_{M}u^2dV=1$, has positive solutions, where a and b are two real constants. We also construct various monotonic quantities under the Ricci-Bourguignon flow and the normalized Ricci-Bourguignon flow. Moreover, we prove that a compact steady breather which evolves under the Ricci-Bourguignon flow should be Ricci-flat.

An Approach to Scheduling Bursty Traffic

Mahmoud Daneshvar Farzanegan,Hossein Saidi,Mehdi Mahdavi 한국전자통신연구원 2014 ETRI Journal Vol.36 No.1

The scheduling scheme in packet switching networks isone of the most critical features that can affect theperformance of the network. Hence, many schedulingalgorithms have been suggested and some indices, such asfairness and latency, have been proposed for thecomparison of their performances. While the nature ofInternet traffic is bursty, traditional scheduling algorithmstry to smooth the traffic and serve the users based on thissmoothed traffic. As a result, the fairness index mainlyconsiders this smoothed traffic and the service rate as themain parameter to differentiate among different sessionsor flows. This work uses burstiness as a differentiatingfactor to evaluate scheduling algorithms proposed in theliterature. To achieve this goal, a new index that evaluatesthe performance of a scheduler with bursty traffic isintroduced. Additionally, this paper introduces a newscheduler that not only uses arrival rates but alsoconsiders burstiness parameters in its schedulingalgorithms.

Evolution and monotonicity for a class of quantities along the Ricci-Bourguignon flow

Farzad Daneshvar,Asadollah Razavi 대한수학회 2019 대한수학회지 Vol.56 No.6

In this paper we consider the monotonicity of the lowest constant $\lambda^{b}_{a}(g)$ under the Ricci-Bourguignon flow and the normalized Ricci-Bourguignon flow such that the equation \begin{equation*} -{\rm \Delta} u + au\log u + bRu= \lambda^{b}_{a}(g) u \end{equation*} with $\int_M u^2\, {\rm dV}=1,$ has positive solutions, where $a$ and $b$ are two real constants. We also construct various monotonic quantities under the Ricci-Bourguignon flow and the normalized Ricci-Bourguignon flow. Moreover, we prove that a compact steady breather which evolves under the Ricci-Bourguignon flow should be Ricci-flat.

Remote sensing analysis of unknown origin of a crater in western Yemen

Mohammad Reza Mansouri Daneshvar,Hamid Nejadsoleymani 대한공간정보학회 2017 Spatial Information Research Vol.25 No.4

The present study aims to detect unknown origin of a terrestrial structure in western Yemen based on the remote sensing procedure in order to enhance scientific database on the possible impact craters in the Middle Eastern countries. On this basis, a crater-shaped structure, named as Salab crater, was detected with a diameter of ~3.2-km. Topographical study indicated a circular morphology with two rings. Interior ring has a diameter of ~1-km and depth of ~100-m, while exterior ring has a diameter of ~2.2-km and depth of ~400-m. According to the geological data, the crater environ mainly has the different units outcropped of the Jurassic Amran limestone, the Cretaceous Tawilah sandstone, and the late Oligocene to early Miocene volcanic groups and intrusions. We indicated that the Salab crater is entirely located on Jurassic limestone of Amran group bedrocks with poor aquifer, low potential of water productivity and impure limestone deposits. Hence, the Salab crater could not be categorized as a volcanic crater or a karstic product. In addition, it could not be the remained from a salt-dome or a certain active hydrothermal pattern of springs. Nevertheless, to distinguish of the crater from old and fossil travertine crater or a possible impact crater, a detailed field work and a petrology investigation should be considered.

The Effect of Walnut (Juglans regia) Leaf Extract on Glycemic Control and Lipid Profile in Patients With Type 2 Diabetes Mellitus: A Systematic Review and Meta-Analysis of Randomized Clinical Trials

Mirzababaei Atieh,Daneshvar Mojtaba,Abaj Faezeh,Daneshzad Elnaz,Hosseininasab Dorsa,Clark Cain C. T.,Mirzaei Khadijeh 한국임상영양학회 2022 Clinical Nutrition Research Vol.11 No.2

Numerous clinical trials have examined the beneficial effects of Juglans regia leaf extract (JRLE) in patients with type 2 diabetes mellitus (T2DM); however, the results of these studies are inconsistent. Therefore, we conducted the current systematic review and meta-analysis to evaluate the effect of JRLE on glycemic control and lipid profile in T2DM patients. We searched online databases including PubMed, Scopus, EMBASE, and Web of Science for randomized controlled clinical trials that examined the effect of JRLE on glycemic and lipid indices in T2DM patients. Data were pooled using both fixed and random-effect models and weighted mean difference (WMD) was considered as the overall effect size. Of the total records, 4 eligible studies, with a total sample size of 195 subjects, were included. The meta-analysis revealed that JRLE supplementation significantly reduces fasting blood glucose (WMD, −18.04; 95% confidence interval [CI], −32.88 mg/dL, −3.21 mg/dL; p = 0.017) and significantly increases fasting insulin level (WMD, 1.93; 95% CI, 0.40 U/L, 3.45 U/L; p = 0.014). Although the overall effect of JRLE supplementation on hemoglobin A1c was not significant, a significant reduction was seen in studies with an intervention duration of > 8 weeks (WMD, −0.64; 95% CI, −1.16%, −0.11%; p = 0.018). Moreover, we also found no significant change in lipid parameters. Our findings revealed a beneficial effect of JRLE supplementation on glycemic indices in T2DM patients, but no significant improvement was found for lipid profile parameters.

Contamination level and risk assessment of heavy metals in the topsoil around cement factory: A case study

Hamid Amiri,Ehsan Daneshvar,Sama Azadi,Samira Azadi 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.5

The cement industry is considered as a major source of heavy metals pollution in topsoil. This study aims at measuring the heavy metal contamination level in the vicinity of Shiraz cement factory, and assessing the ecological and environmental risks associated with the factory"s activities in the surrounding topsoil. To do so, 10 samples of soil were taken from around the Shiraz cement factory at the depth of 0-10 cm and the concentration of some heavy metals including Al, Cd, Ni, and Pb was measured. Enrichment factor (EF), geo-accumulation (Igeo), and pollution load (PLI) indices were used to assess the ecological risk of heavy metals.Based on the results, the mean concentration of Al, Ni, Cd, and Pb was 6,937.14, 88.09, 1.96, and 30.74 mg/kg, respectively. The EF results showed that due to anthropogenic activities, the Ni, Pb, and Cd element has moderate, severe, and very severe enrichment in the study area, respectively. The Igeo result for Al, Ni, Pb, and Cd was -0.82, -0.17, 0.16, and 0.68, respectively, which indicates non- to slightly pollution of these heavy metals in this region. The mean PLI in the study area was 1.4 indicating the low to medium pollution of heavy metal. The results of this study can be useful in determining and investigating the environmental effects of Shiraz cement factory.

Quantitative-fuzzy Controller Design for Multivariable Systems with Uncertainty

Mohammad Reza Gharib,Armin Daneshvar 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.6

This work serves as a pioneer contribution in terms of application of Quantitative Feedback Theory(QFT) methodology and fuzzy logic method to design a controller for MIMO systems. Due to the presence of uncertainty in multivariable dynamic systems, the application of robust control methods for achieving high accuracy in tracking is inevitable. On the other hand, application of QFT to MIMO uncertain systems still remains to be one of the most difficult control problems for engineers. In this paper, authors attempt to simplify the MIMO control problem by proposing a new algorithm which joins QFT and fuzzy techniques. In order to illustrate the utility of the proposed algorithm, its application on a two degree of freedom link robot manipulator is depicted. Initially, a QFT controller is designed for each link to overcome the track and disturbance rejection problems. Then, a bi-level tuned PDfuzzy controller is employed as one strategy for curbing probable errors in the previous controller. The controller design was carried in the following stages; first, a linear PD controller independently applied to each actuator. Then, fuzzy rules were developed to design a fuzzy PD controller. Fuzzy controller normalizing parameters were regulated according to maximum PD control errors. In the second stage, named nonlinear tuning, other parameters of the fuzzy controller were tuned using genetic algorithms. Finally,nonlinear simulations of arbitrary path tracking shows that the proposed controller has a consistent tracking ability,and also it can clearly be seen that the mentioned approach is precise and very simple in comparison to other MIMO control techniques.

Survival of Colorectal Cancer in the Presence of Competing-Risks - Modeling by Weibull Distribution

Baghestani, Ahmad Reza,Daneshvar, Tahoura,Pourhoseingholi, Mohamad Amin,Asadzadeh, Hamid Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.3

Background: Colorectal cancer (CRC) is the commonest malignancy in the lower gastrointestinal tract in both men and women. It is the third leading cause of cancer-dependent death in the world. In Iran the incidence of colorectal cancer has increased during the last 25 years. Materials and Methods: In this article we analyzed the survival of 447 colorectal patients of Taleghani hospital in Tehran using parametric competing-risks models. The cancers of these patients were diagnosed during 1985 - 2012 and followed up to 2013. The purpose was to assess the association between survival of patients with colorectal cancer in the presence of competing-risks and prognostic factors using parametric models. The analysis was carried out using R software version 3.0.2. Results: The prognostic variables included in the model were age at diagnosis, tumour site, body mass index and sex. The effect of age at diagnosis and body mass index on survival time was statistically significant. The median survival for Iranian patients with colorectal cancer is about 20 years. Conclusions: Survival function based on Weibull model compared with Kaplan-Meier survival function is smooth. Iranian data suggest a younger age distribution compared to Western reports for CRC.

Survival of Colorectal Cancer Patients in the Presence of Competing-Risk

Baghestani, Ahmad Reza,Daneshvar, Tahoura,Pourhoseingholi, Mohamad Amin,Asadzade, Hamid Asian Pacific Journal of Cancer Prevention 2014 Asian Pacific journal of cancer prevention Vol.15 No.15

Background: Colorectal cancer (CRC) is considered to be a main cause of malignancy-related death in the world, being commonly diagnosed in both men and women. It is the third leading cause of cancer dependent death in the world and there are one million new cases diagnosed per year. In Iran the incidence of colorectal cancer has increased during the last 25 years and it is the fifth cause of cancer in men and the third in women. Materials and Methods: In this article we analyzed the survival of 475 colorectal patients of Taleghani hospital in Tehran with the semi-parametric competing-risks model. Results: There were 55% male cases and at the time of the diagnosis most of the patients were between 48 and 67years old. The probability of a patient death from colorectal cancer with survival of more than 25 years was about 0.4. Body mass index, height, tumour site and gender had no influence. Conclusions: According to these data and by using semi-parametric competing-risks method, we found out that only age at diagnosis has a significant effect on these patient survival time.

Indirect Organogenesis through Seedling-Derived Leaf Segments of Ficus Religiosa - a Multipurpose Woody Medicinal Plant

Mohsen Hesami,Mohammad Hosein Daneshvar 한국작물학회 2018 Journal of crop science and biotechnology Vol.21 No.2

The aim of this study is to introduce the suitable protocol for indirect regeneration from seedling-derived leaf segment of Ficus religiosa. The leaf explant successfully produced callus on MS medium containing various concentrations of auxin in combination with BAP. The maximum callus induction (100%) was achieved in MS medium containing 0.5 mg/l 2,4-D plus 0.05 mg/l BAP and MS medium containing 1.5 mg/l NAA plus 0.15 mg/l BAP as well. MS medium consisting of 2,4-D produced yellow-brownish and friable callus (type I) while the yellowish and compact calli (type II) were obtained in MS medium consisting of NAA. On the other hand, MS medium supplemented with IBA formed greenish and compact calli (type Ш). The regeneration rate in type II callus was less than the type I, and there was no shoot induction observed on type Ш calli. MS medium supplemented with 1.5 mg/l BAP in combination with 0.15 mg/l IBA had the highest regeneration frequency (100%) and maximum shoot numbers (5.16) as well as shoot length (2.56 cm) in type I callus. A maximum of 93.33% root induction was observed in MS medium supplemented with 2.0 mg/l IBA plus 0.1mg/l NAA. The plantlets were successfully transferred to the greenhouse. This system could be utilized for large-scale multiplication of Ficus religiosa.