OALib Journal期刊

ISSN: 2333-9721



匹配条件: “Zeinab Hendawy” ,找到相关结果约311条。
Reference Point Based TR-PSO for Multi-Objective Environmental/Economic Dispatch  [PDF]
Ahmed Ahmed El-Sawy, Zeinab Mohamed Hendawy, Mohamed A. El-Shorbagy
Applied Mathematics (AM) , 2013, DOI: 10.4236/am.2013.45110

A reference point based multi-objective optimization using a combination between trust region (TR) algorithm and particle swarm optimization (PSO) to solve the multi-objective environmental/economic dispatch (EED) problem is presented in this paper. The EED problem is handled by Reference Point Interactive Approach. One of the main advantages of the proposed approach is integrating the merits of both TR and PSO, where TR has provided the initial set (close to the Pareto set as possible and the reference point of the decision maker) followed by PSO to improve the quality of the solutions and get all the points on the Pareto frontier. The performance of the proposed algorithm is tested on standard IEEE 30-bus 6-genrator test system and is compared with conventional methods. The results demonstrate the capabilities of the proposed approach to generate true and well-distributed Pareto-optimal non-dominated solutions in one single run. The comparison with the classical methods demonstrates the superiority of the proposed approach and confirms its potential to solve the multi-objective EED problem.

Mohammed Abd El-Rahman El-Shorbagy,Ahmed El-Sawy,Zeinab Hendawy
Journal of Global Research in Mathematical Archives , 2013,
Abstract: In this paper, we apply a proposed approach for solving multi-objective engineering design problem (MOEDP) with multiple objectives. In the proposed approach, a reference point based multi-objective optimization (MOO) using a combination between trust region (TR) algorithm and particle swarm optimization (PSO). The integration of TR and PSO has improved the quality of the founded solutions, also it guarantee the faster converge to the Pareto optimal solution. TR has provided the initial set (close to the Pareto set as possible) followed by PSO to improve the quality of the solutions and get all the points on the Pareto frontier. Detailed numerical results on three different MOEDP are reported to demonstrate the effectiveness and advantages of the proposed algorithm for solving practical MOEDP.
Evaluation of Propagation of Chinese Hibiscus (Hibiscus rosa-sinensis) through Stenting Method in Response to Different IBA Concentrations and Rootstocks  [PDF]
Zeinab Izadi, Hossein Zarei
American Journal of Plant Sciences (AJPS) , 2014, DOI: 10.4236/ajps.2014.513197

Stenting is a vegetative propagation method, based on cutting and grafting in one action. The question addressed in this study is whether indole-3-butyric acid (IBA) concentration is able to impress success of Chinese hibiscus propagation when grafted onto two kinds of rootstocks. The used IBA concentrations include: 0, 1000, 3000 and 5000 ppm and two cultivars of Hibiscus syriacus (“Blue Stain” and “Jeanne d’Arc”), which have been used as rootstock. Results indicated that, all the cultivars were superior for most of the measured parameters when IBA treatments were used compared to control plants except for average of the longest root size. The highest healing percentage resulted in stentlings (plant which has been propagated by stenting method) with 5000 ppm of IBA treatment. All IBA treatments significantly increased rooting percentage compared with the control plants. Stentlings that were treated with 3000 and 5000 ppm of IBA, produced the greatest leave number. In Chinese hibiscus/“Jeanne d’Arc” combination, higher root number and dry weight of roots were observed. Interactions of kinds of rootstock and IBA concentration showed that the highest healing percentage was obtained in “Blue Stain” in concentration of 5000 ppm and the highest root number were seen in stentlings with “Jeanne d’Arc” in 3000 ppm and “Jeanne d’Arc” in 5000 ppm.

Comparison between Cleavage Stage versus Blastocyst Stage Embryo Transfer in an Egyptian Cohort Undergoing in vitro Fertilization: A Possible Role for Laser Assisted Hatching
Sherif F. Hendawy and TA Raafat
Clinical Medicine Insights: Reproductive Health , 2012, DOI: 10.4137/CMRH.S7735
Abstract: Background: Extended in vitro embryo culture and blastocyst transfer have emerged as essential components of the advanced reproductive technology armamentarium, permitting selection of more advanced embryos considered best suited for transfer. Aim of study: The aim of this study was to compare between cleavage stage and blastocyst stage embryo transfer in patients undergoing intracytoplasmic sperm injection, and to assess the role of assisted hatching technique in patients undergoing blastocyst transfer. Patients and methods: This study was carried out on two groups. Group I: 110 patients who underwent 120 cycles of intracytoplasmic sperm injection with day 2–3 embryo transfer—for unexplained infertility or male factor within the previous 3 years. Their data obtained retrospectively from medical records. Group II: 46 age matched infertile female patients undergoing 51 intracytoplasmic sperm injection cycles for similar causes. Patients in Group II were further subdivided into 2 equal subgroups; Group IIa (23 patients), which had laser assisted hatching and Group IIb (23 patients), which did not have assisted hatching. All patients had an infertility workup including basal hormonal profile, pelvic ultrasound, hysterosalpingogram and/or laparoscope and semen analysis of the patient’s partner. All patients underwent controlled ovarian hyperstimulation: Using long protocol of ovulation induction. Laser assisted hatching was done for blastocysts of 23 patients. Results: Comparison between both groups as regards the reproductive outcome showed a significant difference in pregnancy and implantation rates, both being higher in group II (P < 0.05) Comparison between both subgroups as regards the reproductive outcome showed a highly significant difference in pregnancy and implantation rates, both being higher in Group IIa (P < 0.01). There was also a significantly higher rate of multiple pregnancies among Group IIa (P < 0.05). Conclusion: Blastocyst transfer is a successful and improved alternative for patients with multiple failed in vitro fertilization attempts, associated with a significant increase in pregnancy and implantation rates. Furthermore, laser assisted hatching increases implantation and clinical pregnancy rates.
Monitoring socioeconomic inequity in maternal health indicators in Egypt: 1995-2005
Zeinab Khadr
International Journal for Equity in Health , 2009, DOI: 10.1186/1475-9276-8-38
Abstract: The current paper uses data on maternal health available in three consecutive Demographic and Health Surveys (1995-2000-2005). Concentration index is used to assess the levels of health inequity over the ten year period.Although previous efforts in maternal health have contributed to substantial improvements in the general levels of maternal health indicators, these improvements were not enjoyed equally by women in various social groups. Indicators that have long been the focus of health policy such as fertility and contraceptive use showed some declines in disparities but they are far behind from achieving equity. Other indicators which relate to unmet need, prenatal care, delivery, postnatal care still loaded with high levels of inequity and call for more comprehensive policy interventions.Recently, heightened concerns for health equity and social determinants of health have contributed to the burgeoning of evidence-based research that directs policy-makers' attention to the significance of health inequities and promotes policies and actions to tackle their structural and social determinants. In the area of maternal health research, examination of socioeconomic maternal health inequities and disparities has received significant attention among researchers and numerous studies in the international literature have investigated various dimensions of maternal health inequities by women's socioeconomic indicators. These studies have repeatedly confirmed the strong association between women's socioeconomic status and their maternal health indicators, in which low socioeconomic status is significantly associated with low maternal health status and under utilization of maternal health care services [1-4]. In Ecuador, high education and high economic status were positively associated with receiving prenatal care [5]. Women with a secondary level of education or higher were 3.3 times more likely than women with no formal education to receive prenatal care. They were also 3.
Preimplantation genetic diagnosis in Saudi Arabia
Zeinab Abotalib
Bioinformation , 2013,
Abstract: Preimplantation genetic diagnosis (PGD) testing is the practice of obtaining a cellular biopsy sample from a developing human oocyte or embryo, acquired via a cycle of in vitro fertilization (IVF); evaluating the genetic composition of this sample; and using this information to determine which embryos will be optimal for subsequent uterine transfer. PGD has become an increasingly useful adjunct to IVF procedures. The ability to provide couples who are known carriers of genetic abnormalities the opportunity to deliver healthy babies has opened a new frontier in reproductive medicine. The purpose of the PGD is enables us to choose which embryos will be implanted into the mother. In the present study 137 families who had undergone IVF at Habib Medical Centre, were enrolled for the PGD analysis. The couple visited the clinic for the sex selection, recurrent fetal loss and with the recurrent IVF failure. 802 embryos were tested by the biopsy method and 512 are found to be normal and 290 were abnormal embryos. In this study only 24% of the embryos were transferred and the remaining was not transferred because of the abnormalities or undesired sex of the embryos. The structural and numerical abnormalities were found to be 16.8%.
The Survey of Correlate Causes of Learning Disabilities Prevalence among Elementary Students
Zeinab Mihandoost
Asian Social Science , 2011, DOI: 10.5539/ass.v7n7p194
Abstract: This study aims to investigate the rate of learning disabilities prevalence and correlate causes among the elementary school students in Ilam, Iran. The research design of the current study was casual-comparative and the population of the study included the third, fourth and fifth graders of the elementary schools in Ilam, Iran. In this research, cluster sampling was employed which covered six hundred students from different classes chosen randomly from a population of clusters. The basis of this sample was the checklist approved by the school teachers on the children with learning disabilities Furthermore, the students’ notebooks on the dictation, composition and mathematics were also taken into consideration. The study population was randomly divided into two groups: one was a group with learning disabilities which included 36 participants and the other was a normal group with the same size of population. Both groups were asked to answer the Wisc, Wepman and Mariyan Framstick tests as well as tests on reading, writing and math. The method of data gathering was individual information that was collected by the researcher. The result of this study revealed that 11.40% of the students in third, fourth and fifth grades of elementary schools had learning disabilities. The correlate causes of learning disabilities indicated that the students had problems with memory retention, visual acuity, and hearing memory.
Investigating the stellar system's life-time and the evolution of their mass function using N-body simulation
Zeinab Khorrami
Physics , 2012,
Abstract: In this thesis we study several aspects of dynamical evolution of stellar clusters. The results of more than 200 simulations of single-mass star clusters with different initial total mass, half-mass radius and galactocentric distance, are reported. Recent studies of star clusters show a linear relation between a star cluster's dissolution time and its two-body relaxation time in logarithmic scale. We found that the single-mass star clusters do not show such a linear relation. We present new modified initial parameters to obtain a linear relation for single-mass star clusters. Also the evolution of multi-mass clusters and their lifetime, in the presence of the Galaxy is investigated. We simulate about 90 multi-mass star clusters with the Nbody6 code. These clusters have different initial total mass, half-mass radius and galactocentric distance. Finally we investigate the evolution of the stellar mass function and show that the slopes of the mass functions decrease with time. In addition we study the effect of galactocentric distance of star clusters on the evolution of the mass function.
Ensemble Analysis of Adaptive Compressed Genome Sequencing Strategies
Zeinab Taghavi
Quantitative Biology , 2013,
Abstract: Acquiring genomes at single-cell resolution has many applications such as in the study of microbiota. However, deep sequencing and assembly of all of millions of cells in a sample is prohibitively costly. A property that can come to rescue is that deep sequencing of every cell should not be necessary to capture all distinct genomes, as the majority of cells are biological replicates. Biologically important samples are often sparse in that sense. In this paper, we propose an adaptive compressed method, also known as distilled sensing, to capture all distinct genomes in a sparse microbial community with reduced sequencing effort. As opposed to group testing in which the number of distinct events is often constant and sparsity is equivalent to rarity of an event, sparsity in our case means scarcity of distinct events in comparison to the data size. Previously, we introduced the problem and proposed a distilled sensing solution based on the breadth first search strategy. We simulated the whole process which constrained our ability to study the behavior of the algorithm for the entire ensemble due to its computational intensity. In this paper, we modify our previous breadth first search strategy and introduce the depth first search strategy. Instead of simulating the entire process, which is intractable for a large number of experiments, we provide a dynamic programming algorithm to analyze the behavior of the method for the entire ensemble. The ensemble analysis algorithm recursively calculates the probability of capturing every distinct genome and also the expected total sequenced nucleotides for a given population profile. Our results suggest that the expected total sequenced nucleotides grows proportional to $\log$ of the number of cells and proportional linearly with the number of distinct genomes.
Optical Measurements of Thermotropic Liquid Crystals  [PDF]
Tawfik A. El-Dessouki, Mohammed Roushdy, Nabil I. Hendawy, Magdi M. Naoum, Ayman A. Zaki
Journal of Modern Physics (JMP) , 2013, DOI: 10.4236/jmp.2013.41008
Abstract: In this work, an experimental approach was used for measuring birefringence of thermotropic liquid crystal materials at different wavelengths in the visible region by using speckle interferometry. Also the values of the refractive indices were measured for these thermotropic liquid crystal materials in isotropic and liquid crystal phases at different wave-lengths. Temperature dependency of the refractive indices for each LC sample at certain wavelengths was investigated in the isotropic and in LC phases.

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