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Search Results: 1 - 10 of 53 matches for " Safwat Abouhashem "
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Cerebrospinal Fluid Diversion Procedures for Treatment of Idiopathic Intracranial Hypertension: Single Center Experience  [PDF]
Mahmoud M. Taha, Safwat Abouhashem, Ayman Abedelrahman
Open Journal of Modern Neurosurgery (OJMN) , 2017, DOI: 10.4236/ojmn.2017.73009
Abstract: Idiopathic intracranial hypertension (IIH) is a disorder characterized by increased intracranial pressure without any identifiable etiology with normal brain imaging and normal cerebrospinal fluid (CSF) content. CSF diversion procedures are commonly used for treatment if medical treatment failed. The aim of this study is to report our experience in treatment of IIH with lumboperitoneal (LP) and stereotactic guided ventriculoperitoneal (VP) shunts. The clinical data of 43 consecutive patients with IIH refractory to medical treatment and underwent CSF diversion procedures between 2009 and 2014 were analyzed. 29 patients underwent LP shunts and the remaining 14 patients underwent stereotactic guided Ventricular shunts. All patients underwent clinical, imaging and CSF manometry evaluation. 38 (88.4%) patients were female and the remaining 5 (11.6%) patients were male. The mean age was 27.2 years. The opening pressure was above 300 mm H2O in 26 (69.8%) patients. Headache (100%) and blurring and/or diminution of vision (81.4%) were the commonest clinical presentation. 36 (83.7%) patients reported recovery of their headache and 30 (69.7%) patients showed complete resolution of papilledema. The clinical outcome between both procedures was not significant. The incidence of perioperative complications (20.7% vs. 0%) and shunt revisions (27.6% vs. 7.1%) were higher in patients with LP shunt than patients with stereotactic Ventricular shunts. The results of this study demonstrate that both LP and Ventricular shunts are valid diversion procedures for treatment of IIH. Stereotactic guided Ventricular shunt has lower incidence of complications and revisions and seems to be safe, effective and feasible alternative procedure for treatment of IIH.
The implications of genetic research
Basil Safwat
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports214
Abstract: Each page has forward and backward links and a link to the contents page, making navigation through and between chapters relatively easy.I could not find a publication date on either the website or the PDF.The language is plain and simple and there are some useful graphics.A list of related websites, including those containing the host's own and other online publications, would be useful.Other introductory sites for genetics include Primer on molecular genetics and Blazing a genetic trail.Your genes, your choicesPrimer on molecular geneticsBlazing a genetic trail
An introduction to genetic diseases
Basil Safwat
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports213
Abstract: The site is structured in the same way as the original print publication and is divided into chapters and topics; each page has a chapter menu down the side and there are lots of navigation pointers at the bottom of the page, making it very easy to navigate.This report was published in 1991 and is many years out of date. But as it deals with the basic concepts behind genetic research, it is still useful.A wonderful wall chart explains, in a well laid out, engaging and serious manner, the underlying genetics, techniques and theory used to target and treat a genetic disease. All technical words are linked to the glossary.The publication has simply been taken from its printed form and put on the web 'as is' so does not take full advantage of the wonders of web technology.Some form of search facility would be nice, even if it were just in the form of an index-type search.Other introductions to genetic research can be found at Your genes, your choices, Primer of molecular genetics and To know ourselves.Blazing a genetic trailYour genes, your choicesPrimer of molecular geneticsTo know ourselves
The human genome project explained
Basil Safwat
Genome Biology , 2000, DOI: 10.1186/gb-2000-1-1-reports215
Abstract: The site has a straightforward two-tiered structure, and it is very easy to find your way to the section you are interested in. A 'next page' button at the bottom of each page makes movement through the site easy. But the glossary link is not a direct one and first takes you to a blank intermediate page, and there is no search facility.The booklet was published in June 1992 and the website was last updated in June 1997.The booklet has been transferred directly onto the website and so does not take advantage of being published online The graphics are of poor quality, both esthetically and as explanations of the text, and are taken directly from the paper publication.A search facility would be helpful, as would some color images.Introductory information on genetics is also provided by Blazing a genetic trail and To know ourselves.Primer on molecular geneticsBlazing a genetic trailTo know ourselves
Europe and Palestine: From the Crusades to modern times :
Safwat Hatem
Historical Kan Periodical , 2009,
Abstract: . . " " . . 711 1099 : .
Use of Basal Serum Testosterone Level as Predictor for Poor Ovarian Response in Women with Unexplained Infertility Undergoing In Vitro Fertilization Cycle: Prospective Study  [PDF]
Waleed M. Khalaf, Hayam Fathy, Sarah Safwat
Open Journal of Obstetrics and Gynecology (OJOG) , 2018, DOI: 10.4236/ojog.2018.814153
Abstract: Background: Delayed pregnancy in women and marked increase in the numbers of older women who fail to respond to ovarian stimulation had been a significant issue. This study aims to assess the value of basal serum testosterone level as a predictor of ovarian response for induction of ovulation in women with unexplained infertility undergoing IVF (in vitro fertilization) cycle. Patients and Methods: A prospective study was conducted in Ain Shams University Maternity hospital Infertility Center during a period of time from October 2016 to June 2017. This study recruited 89 women. On day 2 or 3 of a spontaneous menstrual cycle of the included women within 3 months before fresh IVF cycle, basal hormonal (FSH, LH, estradiol, total testosterone) concentrations, AFC (antral follicle count) were performed. Using the Long-protocol for induction of ovulation, serial monitoring of ovarian response was assessed by transvaginal ultrasound. When the expected ovarian response was reached (at least three oocytes 17 mm), we gave trigger dose of HCG. Ultrasound guided oocyte aspiration was performed 34 -
The Synchronized Peer-to-Peer Framework and Distributed Contention-Free Medium Access for Multihop Wireless Sensor Networks
Ahmad Khayyat,Ahmed Safwat
Journal of Sensors , 2008, DOI: 10.1155/2008/728415
Abstract: IEEE 802.15.4 is a low-power, low-rate MAC/PHY standard that meets most of the stringent requirements of singlehop wireless sensor networks. Sensor networks with nodal populations composed of thousands of devices have been envisioned in conjunction with environmental, vehicular, military applications, and many others. However, such large sensor network deployments necessitate multihop support as well as low power consumption. In the light of the standard's extremely limited joint support of the two aforementioned attributes, this paper presents two essential contributions. First, a framework is proposed to implement a new IEEE 802.15.4 operating mode, namely, the synchronized peer-to-peer mode. This mode is designed to enable the standard's low-power features in peer-to-peer multihop-ready topologies. The second contribution is a distributed GTS (dGTS) management scheme designed to function in the newly devised network mode. This protocol provides reliable contention-free access in peer-to-peer topologies in a completely distributed manner. Assuming optimal routing, our simulation experiments reveal perfect delivery ratios as long as the traffic load does not reach or surpass its saturation threshold. dGTS sustains at least twice the delivery ratio of contention-based access under suboptimal dynamic routing. Moreover, the dGTS scheme exhibits minimum power consumption by eliminating the retransmissions attributed to contention, which, in turn, reduces the number of transmissions to a minimum.
On Wireless Ad Hoc Networks with Directional Antennas: Efficient Collision and Deafness Avoidance Mechanisms
Li Yihu,Safwat Ahmed
EURASIP Journal on Wireless Communications and Networking , 2008,
Abstract: Wireless ad hoc networks allow anywhere, anytime network connectivity with complete lack of central control, ownership, and regulatory influence. Medium access control (MAC) in such networks poses extremely timely as well as important research and development challenges. Utilizing directional antennas in wireless ad hoc networks is anticipated to significantly improve the network performance due to the increased spatial reuse and the extended transmission range. Nevertheless, using directional antennas in wireless ad hoc networks introduces some serious challenges, the most critical of which are the deafness and hidden terminal problems. This paper thoroughly explores these problems, one of which is discovered and reported for the first time in this paper. This paper also proposes a new MAC scheme, namely, directional MAC with deafness avoidance and collision avoidance (DMAC-DACA), to address both problems. To study the performance of the proposed scheme, a complete directional communication extension to layers 1, 2, and 3 is incorporated in the ns2 simulator. The simulation results show that DMAC-DACA significantly enhances the performance and increases the network throughput. This paper also reveals that deafness has a greater impact on network performance than the hidden terminal problem.
On Wireless Ad Hoc Networks with Directional Antennas: Efficient Collision and Deafness Avoidance Mechanisms
Yihu Li,Ahmed Safwat
EURASIP Journal on Wireless Communications and Networking , 2008, DOI: 10.1155/2008/867465
Abstract: Wireless ad hoc networks allow anywhere, anytime network connectivity with complete lack of central control, ownership, and regulatory influence. Medium access control (MAC) in such networks poses extremely timely as well as important research and development challenges. Utilizing directional antennas in wireless ad hoc networks is anticipated to significantly improve the network performance due to the increased spatial reuse and the extended transmission range. Nevertheless, using directional antennas in wireless ad hoc networks introduces some serious challenges, the most critical of which are the deafness and hidden terminal problems. This paper thoroughly explores these problems, one of which is discovered and reported for the first time in this paper. This paper also proposes a new MAC scheme, namely, directional MAC with deafness avoidance and collision avoidance (DMAC-DACA), to address both problems. To study the performance of the proposed scheme, a complete directional communication extension to layers 1, 2, and 3 is incorporated in the ns2 simulator. The simulation results show that DMAC-DACA significantly enhances the performance and increases the network throughput. This paper also reveals that deafness has a greater impact on network performance than the hidden terminal problem.
A Brief State of the Art for Ontology Authoring
Hazem Safwat,Brian Davis
Computer Science , 2014,
Abstract: One of the main challenges for building the Semantic web is Ontology Authoring. Controlled Natural Languages CNLs offer a user friendly means for non-experts to author ontologies. This paper provides a snapshot of the state-of-the-art for the core CNLs for ontology authoring and reviews their respective evaluations.
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