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Search Results: 1 - 10 of 401944 matches for " Ramez M Salem "
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Evaluation of performance of two different chest tubes with either a sharp or a blunt tip for thoracostomy in 100 human cadavers
Clemens M Ortner, Kurt Ruetzler, Nikolaus Schaumann, Veit Lorenz, Peter Schellongowski, Ernst Schuster, Ramez M Salem, Michael Frass
Scandinavian Journal of Trauma, Resuscitation and Emergency Medicine , 2012, DOI: 10.1186/1757-7241-20-10
Abstract: Twenty emergency physicians performed five tube thoracostomies using both blunt and sharp tipped tube kits in 100 fresh human cadavers (100 thoracostomies with each kit). Time until tube insertion served as primary outcome. Complications and success rate were examined by pathological dissection and served as further outcomes parameters.Difference in mean time until tube insertion (63s vs. 59s) was statistically not significant. In both groups, time for insertion decreased from the 1st to the 5th attempt and showed dependency on the cadaver's BMI and on the individual physician. Success rate differed between both groups (92% using blunt vs. 86% using sharp tipped kits) and injuries and misplacements occurred significantly more frequently using chest tubes with sharp tips (p = 0.04).Data suggest that chest drain insertion with trocars is associated with a 6-14% operator-related complication rate. No difference in average time could be found. However, misplacements and organ injuries occurred more frequently using sharp tips. Consequently, if using a trocar technique, the use of blunt tipped kits is recommended.Pneumothorax occurs in 5-41% of all thoracic injuries [1-3], and in up to 25% of patients suffering multiple injuries [4,5]. Besides hemothorax, pneumothorax is the most frequent indication for insertion of a chest tube in trauma patients [4,5]. Complications like tube malposition have been reported in up to 25% of attempted insertions of a chest tube [1,6-8]. In an emergency setting, needle decompression is a widely used technique to manage a tension pneumothorax. However, this is an inexact and potentially dangerous technique. It may be ineffective, and requires subsequent chest tube insertion in a significant number of cases [9-13]. Therefore, needle decompression may be considered primarily as a diagnostic manoeuvre. In advanced pre-hospital emergency care, tube thoracostomy serves as the gold standard in treating tension pneumothorax [14]. The success rate
Wireless Fault-Tolerant Controllers in Cascaded Industrial Workcells Using Wi-Fi and Ethernet  [PDF]
Tarek K. Refaat, Ramez M. Daoud, Hassanein H. Amer
Intelligent Control and Automation (ICA) , 2013, DOI: 10.4236/ica.2013.44041
Abstract:

A Wireless Networked Control System using 802.11b is used to model fault-tolerance at the controller level of an industrial workcell. The fault-tolerance study in this paper presents the cascading of two independent workcells where each controller must be able to handle the load of both cells in case of failure of the other one. The intercommunication is completely wireless between the cells and this feature is investigated. The model incorporates unmodified 802.11b and 802.11g for communication. Sensors send sampled data to both controllers and the controllers to exchange a watchdog. The fault-free and faulty models are both simulated using OPNET Network Modeler. External interference on the critical intercommunication link is also investigated. Results of simulations are presented based on a 95% confidence analysis, guaranteeing correct system performance.

A Robust Multi-RAT VANET/LTE for Mixed Control & Entertainment Traffic  [PDF]
Noha M. Sadek, Hassan H. Halawa, Ramez M. Daoud, Hassanein H. Amer
Journal of Transportation Technologies (JTTs) , 2015, DOI: 10.4236/jtts.2015.52011
Abstract: Intelligent Transportation Systems (ITS) have been receiving significant interest from various stakeholders worldwide. ITS promise major enhancements to the efficiency, safety, convenience and sustainability of transportation systems. To satisfy the diverse vehicular application requirements, this paper proposes an integration of IEEE 802.11-based VANET and LTE cellular network using mobile vehicular gateways. IEEE 802.11 g is used for V2V communications and LTE for V2I communications. A burst communication technique is applied to prevent packet losses in the critical uplink ITS traffic. A performance simulation-based study is conducted to validate the feasibility of the proposed system in an urban vehicular environment. The system performance is evaluated in terms of data loss, data rate, delay and jitter. The results indicate that the proposed Multi-RAT system offers acceptable performance that meets the requirements of the different vehicular applications.
Stable Adaptive Neural Control of a Robot Arm  [PDF]
Salem Zerkaoui, Saeed M. Badran
Intelligent Control and Automation (ICA) , 2012, DOI: 10.4236/ica.2012.32016
Abstract: In this paper, stable indirect adaptive control with recurrent neural networks (RNN) is presented for square multivariable non-linear plants with unknown dynamics. The control scheme is made of an adaptive instantaneous neural model, a neural controller based on fully connected “Real-Time Recurrent Learning” (RTRL) networks and an online parameters updating law. Closed-loop performances as well as sufficient conditions for asymptotic stability are derived from the Lyapunov approach according to the adaptive updating rate parameter. Robustness is also considered in terms of sensor noise and model uncertainties. This control scheme is applied to the manipulator robot process in order to illustrate the efficiency of the proposed method for real-world control problems.
Hormonal Requirements Trigger Different Organogenic Pathways on Tomato Nodal Explants  [PDF]
Salem Jehan, A. M. Hassanein
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.411263
Abstract:

In this work, nodal-disk segments (4-6 mm in diameter × 5-6 mm in length) were obtained from established shoot culture, resulted from disinfected tomato seedlings, and they were suitable to induce different organogenic pathway under the influence of specific hormonal treatment. Application of BAP (1-2.5 mg/l) alone or in combination of 0.5 mg/l NAA resulted in induction of shoot formation. Somatic embryogenesis was rarely appeared (6%) when relatively low concentration of BAP (1.5 mg/l) with low concentration of IAA (0.5 mg/l IAA) was applied. Root induction was triggered when nodal explants or shoot cuttings were cultured on MS medium with (1 mg/l IAA, IBA or NAA) or without auxins, but the best result was obtained when 1 mg/l IAA was used. Application of 0.5 mg/l NAA stimulated callus formation but the best result was obtained when the three different phytohormoes were used (0.5 mg/l 2,4-D + 1 mg/l NAA + 0.5 mg/l BAP). These results indicated that nodal segments, as described in this protocol, can be used as alternative to other types of explants such as cotyledon, hypocotyl and leaf explants.

Role of Platelet Rich Plasma in Treatment of Diabetic Foot Ulcers  [PDF]
Aymen Salem, Ahmad M. Tawfik
Surgical Science (SS) , 2016, DOI: 10.4236/ss.2016.76038
Abstract: Objectives: The aim of this study is to compare between the platelet rich plasma and balanced moist dressing as regards the healing rate in chronic non ischemic diabetic foot ulcers. Patients and Method: From Feb. 2014 till May 2015, 73 patients from the attendees to Zagazig university hospitals were selected to our study. 2 groups were created, one for PRP (platelet rich plasma) and the other for balanced moist dressing. Frequent registration for the number of healed ulcers was done every week. Results: By the end of the 3rd week almost all the ulcers in the PRP group were healed. But the other group needed about 8th weeks for the same results. Conclusion: PRP seems to be an attractive choice in management of chronic diabetic ulcers provided that there is good blood supply and proper offloading was done.
Functional Activity of Some Growth Regulators on Yield Components and Endogenous Hormones of Cowpea Plants (Vigna sinensis L.)  [PDF]
Salem M. Al-Amri
Agricultural Sciences (AS) , 2018, DOI: 10.4236/as.2018.910086
Abstract: The effect of seed presoaking with different concentrations of growth bio-regulators (indole acetic acid, gibberellic acid and kinetin) on productivity and some biochemical and physiological aspects of yielded seeds of cowpea (Vigna sinensis L.) was investigated. Generally, application of growth regulators stimulated yield and yield quality of cowpea plants as compared to control plants through inducing a massive increase in number of pods/plants, seed biomass, pod length and number of seeds. In addition, results of this study showed that these growth regulators increased protein content and total soluble sugars in cowpea yielded seeds. Finally, it is evident from the present data that application of kinetin appeared to be the most effective hormone in stimulated productivity endogenous hormones and biochemical aspects in yielded seeds of cowpea plants.
Bevacizumab in the treatment of ovarian cancer
Ramez N Eskander, Leslie M Randall
Biologics: Targets and Therapy , 2011, DOI: http://dx.doi.org/10.2147/BTT.S13071
Abstract: evacizumab in the treatment of ovarian cancer Review (8125) Total Article Views Authors: Ramez N Eskander, Leslie M Randall Published Date January 2011 Volume 2011:5 Pages 1 - 5 DOI: http://dx.doi.org/10.2147/BTT.S13071 Ramez N Eskander1, Leslie M Randall2 1Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California Irvine Medical Center, Orange, CA, USA; 2Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California, Irvine, Orange, CA, USA Abstract: Despite advances in surgical cytoreduction and cytotoxic chemotherapy, ovarian cancer continues to be the leading cause of death in women with gynecologic malignancy. Our understanding of the treatment of ovarian cancer was revolutionized with the discovery of platinum- and taxane-based adjuvant chemotherapy regimens. Since that time however, overall survival has been stable. Given the above, an emphasis has been placed on exploring alternative therapeutics. Recent research efforts have improved our understanding of the molecular biology of ovarian cancer and novel targeted treatment strategies have emerged. The most studied of these agents has been the monoclonal anti-vascular endothelial growth factor antibody bevacizumab. The purpose of this review is to discuss management issues related to the treatment of ovarian cancer, with a focus on the utilization of bevacizumab, summarizing applicable clinical trials, its potential benefits, and reported adverse events.
Bevacizumab in the treatment of ovarian cancer
Ramez N Eskander,Leslie M Randall
Biologics: Targets and Therapy , 2011,
Abstract: Ramez N Eskander1, Leslie M Randall21Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California Irvine Medical Center, Orange, CA, USA; 2Division of Gynecologic Oncology, Department of Obstetrics and Gynecology, University of California, Irvine, Orange, CA, USAAbstract: Despite advances in surgical cytoreduction and cytotoxic chemotherapy, ovarian cancer continues to be the leading cause of death in women with gynecologic malignancy. Our understanding of the treatment of ovarian cancer was revolutionized with the discovery of platinum- and taxane-based adjuvant chemotherapy regimens. Since that time however, overall survival has been stable. Given the above, an emphasis has been placed on exploring alternative therapeutics. Recent research efforts have improved our understanding of the molecular biology of ovarian cancer and novel targeted treatment strategies have emerged. The most studied of these agents has been the monoclonal anti-vascular endothelial growth factor antibody bevacizumab. The purpose of this review is to discuss management issues related to the treatment of ovarian cancer, with a focus on the utilization of bevacizumab, summarizing applicable clinical trials, its potential benefits, and reported adverse events.Keywords: bevacizumab, ovarian cancer, molecular targeted therapy, VEGF, angiogenesis
On the Performability of Hierarchical Wireless Networked Control Systems  [PDF]
Esraa A. Makled, Hassan H. Halawa, Ramez M. Daoud, Hassanein H. Amer, Tarek K. Refaat
Intelligent Control and Automation (ICA) , 2015, DOI: 10.4236/ica.2015.62013
Abstract: This paper investigates the performability of hierarchical Wireless Networked Control Systems (WNCS). The WNCS studied can operate in two modes: passive supervisor and active supervisor. It is first shown that the Markov models for both modes are identical. Performability models are then developed and a case study shows how to use these models to help make design decisions. More specifically, it is observed that the performability of a passive supervisor system increases in time while that of an active supervisor system decreases in time.
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