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New Passenger Services in Railway Stations Based on Mode Group Diversity Multiplexing Optical Fiber Communications

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Journal of Civil Engineering and Architecture 2012年第10期6卷 1362-1368页

作者： Dafa Loum Charles Tatkeu iyad dayoub Marc Heddebaut Jean Michel Rouvaen Univ. Lille Nord de France- F-59000 Lille France IFSTTAR LEOST F-59666 Villeneuve d'Ascq France IEMN DOAE University of Valenciennes and Hainaut Cambrdsis F-59313 Valenciennes Cedex France

Nowadays, because of its wide bandwidth and high communication capability, the optical fiber is more and more used for high data rate transmission of information in railway environments. Conventionally, only one service is sent over the fiber at a time. However, many different services can be simultaneously conveyed in railway stations such as passenger information service, cellular phone, Wi-Fi... The objective of the work proposed in this paper is to demonstrate the potential benefits of transmitting radio signals over fiber in a railway environment. The main idea is to exploit the full capacity of the fiber by transmitting multiple services using the same fiber. Since, different services are operating in different frequency bands; we propose a new multiplexing technique called Mode Group Diversity Multiplexing （MGDM） to ensure the transmission of multiple services using the same fiber, without additional infrastructure. There are numerous advantages of the proposed technique, e.g., faster and reliable data exchange, high resolution video surveillance capability, high data rate information exchange in railway stations. We present, in this paper, the physical characteristics of optical fibers, performance of MGDM multiplexing technique, and the influence of the laser excitation conditions at the entrance of the fiber on the performances of the system.

关键词： Optical fiber passenger services railway station mode group diversity multiplexing.

Design of Environmental Biosensor Based on Photonic Crystal Fiber with Bends Using Finite Element Method

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Optics and Photonics Journal 2015年第3期5卷 69-78页

作者： Shyqyri Haxha Ahmed Teyeb Fathi Abdel Malek Emmanuel Kofi Akowuah iyad dayoub Department of Computer Science and Technology University of Bedfordshire Luton UK ESPRIT School of Engineering and Technology Ariana Tunisia National Institute of Applied Sciences and Technology The University of Carthage Tunis Tunisia IEMN DOAE University of Valenciennes Valenciennes France

In this paper, a biosensor based on photonic crystal fiber (PCF) is proposed and designed using Full-Vectorial Finite Element Method (FVFEM). The proposed PCF sensor consists of three concentric circles surrounding the core. The key optical sensor characteristics such as sensitivity, the field profiles and real part of the refractive index of the proposed PCF structure are investigated by employing the FVFEM. The proposed sensor can be deployed for environmental sensing when the PCF active region is filled with either analytes such as liquids or gas. By careful selection of the design parameters such as the radius of the sensing circle, the diameter of air holes in the core region and hole to hole spacing, Λ, the sensitivity analytes is determined. Our simulation results show that, the electric field distribution is primary localized in the third concentric circle with a radius of 16 μm. Effects of PCF bending on the sensitivity is also studied and reported.

关键词： Biosensors Photonic Crystal Fibres Sensor Nanosensor Finite Element Method

Probiotics for antibiotic-associated diarrhea:Do we have a verdict?

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World Journal of Gastroenterology 2014年第47期20卷 17788-17795页

作者： iyad Issa Rami Moucari Department of Gastroenterology and Hepatology Rafik Hariri University HospitalHamraBeirut 2034-7304 Department of Gastroenterology and Hepatology Advanced Cure Diagnostic CenterUAE 61887Abu Dhabi

Probiotics use has increased tremendously over the past ten *** was coupled with a surge of data relating their importance in clinical *** diarrhea,whose frequency has risen recently,was one of the earliest targets with data published more than ten years ***,available trials suffer from severe discrepancies associated with variability and heterogeneity of several *** published randomized controlled trials and subsequent meta-analyses suggest benefit for probiotics in the prevention of antibiotic-associated *** same seems to also apply when the data is examined for Clostridium difficile-associated ***,the largest randomized double-blind placebo-controlled trial to date examining the use of a certain preparation of probiotics in antibiotic-associated diarrhea showed disappointing results,but it was flawed with several *** commonest species of probiotics studied across most trials is Lactobacillus;however,other types have also shown similar *** have enjoyed an impeccable safety *** a few reports of severe infections sometimes leading to septicemia,most of the available trials confirm their harmless behavior and show similaradverse events compared to *** a consensus dictating its use is still lacking,it would be advisable at this point to suggest prophylactic use of probiotics to certain patients at risk for antibiotic-associated diarrhea or to those who suffered previous episodes.

关键词： Probiotics Antibiotic-associated diarrhea Clostridium difficile Prevention Lactobacillus Bifidobacterium

Mesenteric panniculitis: Various presentations and treatment regimens

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World Journal of Gastroenterology 2009年第30期15卷 3827-3830页

作者： iyad Issa Hassan Baydoun Department of Gastroenterology & Hepatology Rafik Hariri University HospitalBeirut 2034-7304Lebanon

Mesenteric panniculitis is a rare, benign and chronic f ibrosing inflammatory disease that affects the adipose tissue of the mesentery of the small intestine and colon. The specific etiology of the disease is unknown. The diagnosis is suggested by computed tomography and is usually confirmed by surgical biopsies. Treatment is empirical and based on a few selected drugs. Surgical resection is sometimes attempted for def initive therapy, although the surgical approach is often limited. We report two cases of mesenteric panniculitis with two different presentations and subsequently varying treatment regimens. Adequate response was obtained in both patients. We present details of these cases as well as a literature review to compare various presentations, etiologies and potential treatment modalities.

关键词： Mesentery Panniculitis Colon Computedtomography Fibrosis Inflammation

Pancreatic cyst dilemma: Between physical and biochemical markers

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World Journal of Gastroenterology 2021年第41期27卷 7207-7209页

作者： iyad Khamaysi Eyal Zussman The Ruth and Bruce Rappaport Faculty of Medicine Technion-Israel Institute of TechnologyHaifa 3109601Israel Department of Gastroenterology Rambam Health Care CampusHaifa 3109601Israel NanoEngineering Group Faculty of Mechanical EngineeringTechnion-Israel Institute of TechnologyHaifa 3109601Israel

Physical analysis of the pancreatic cystic lesions(PCLs)fluid as expressed by the rheological behavior(“string sign”)can improve the diagnostic yield and should be integrated in every multimodal PCLs workup.

关键词： Pancreatic cyst Fluid analysis String sign Rheology

Colorectal cancer screening: An updated review of the available options

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World Journal of Gastroenterology 2017年第28期23卷 5086-5096页

作者： iyad A Issa Malak Noureddine Department of Gastroenterology and Hepatology Rafik Hariri University Hospital

Colorectal cancer (CRC) is a significant cause of morbidity and mortality worldwide. However, colon cancer incidence and mortality is declining over the past decade owing to adoption of effective screening programs. Nevertheless, in some parts of the world, CRC incidence and mortality remain on the rise, likely due to factors including “westernized” diet, lifestyle, and lack of health-care infrastructure and resources. Participation and adherence to different national screening programs remain obstacles limiting the achievement of screening goals. Different modalities are available ranging from stool based tests to radiology and endoscopy with varying sensitivity and specificity. However, the availability of these tests is limited to areas with high economic resources. Recently, FDA approved a blood-based test (Epi procolon®) for CRC screening. This blood based test may serve to increase the participation and adherence rates. Hence, leading to increase in colon cancer detection and prevention. This article will discuss various CRC screening tests with a particular focus on the data regarding the new approved blood test. Finally, we will propose an algorithm for a simple cost-effective CRC screening program.

关键词： Colorectal cancer Colonoscopy Occult blood Fecal DNA test Blood DNA test Screening Guidelines

Consistent Analytic Embedded Atom Potential for Face-Centered Cubic Metals and Alloys

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Journal of Materials Science & Technology 2009年第6期25卷 835-846页

作者： iyad A. Hijazi Young Ho Park Mechanical and Aerospace Engineering Department New Mexico State University Las Cruces

A consistent empirical embedded-atom potential that includes a long range force was developed for fcc （face-centered cubic） metals and alloys. The proposed potential for pure metals does not require modification of the initial function form when being applied to alloy systems. The potential parameters of this model were determined by fitting lattice constant, three elastic constants, cohesive energy, and vacancy formation energies of the pure metals and the heats of solution of the binary alloys via an optimization technique. Parameters for Ag, AI, Au, Cu, Ni, Pd and Pt were obtained. The obtained parameters were used to calculate the bulk modulus, divacancy formation energy, crystal stability, stacking fault energy, vacancy migration energy, and melting point for each pure metal and the heats of formation and lattice constants for binary alloys. The predicted values were in good agreement with experimental results.

关键词： EAM (embedded-atom method) Consistent analytic potential Molecular dynamics Face-centered cubic alloy

Guest Editorial: Special Issue on Parameterized Complexity

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Tsinghua Science and Technology 2014年第4期19卷 323-324页

作者： Liming Cai iyad Kanj Frances A.Rosamond Institute of Bioinformatics University of Georgia Athens GA 30602-7229 USA College of Computing and Digital Media DePaul University Chicago IL 60604 USA School of Engineering and Information Technology Charles Darwin University DarwinNT 0909 Australia

*** Special Issue on Parameterized Complexity of Tsinghua Science and Technology is a tribute to the influential contributions of Jianer Chen to parameterized complexity *** is an occasion to celebrate the many important contributions to this new and prospering branch of theoretical computer science made by Jianer Chen,as he reaches the ripe young age of 60.

关键词： Guest Editorial Special Issue on Parameterized Complexity Chen view FPT

Lipids in liver transplant recipients

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World Journal of Gastroenterology 2016年第12期22卷 3315-3324页

作者： anna hüsing iyad kabar hartmut h schmidt department of transplant medicine university hospital münster48149 münsterGermany

Hyperlipidemia is very common after liver transplantation and can be observed in up to 71% of patients. The etiology of lipid disorders in these patients is multifactorial, with different lipid profiles observed depending on the immunosuppressive agents administered and the presence of additional risk factors, such as obesity, diabetes mellitus and nutrition. Due to recent improvements in survival of liver transplant recipients, the prevention of cardiovascular events has become more important, especially as approximately 64% of liver transplant recipients present with an increased risk of cardiovascular events. Management of dyslipidemia and of other modifiable cardiovascular risk factors, such as hypertension, diabetes and smoking, has therefore become essential in these patients. Treatment of hyperlipidemia after liver transplantation consists of life style modification, modifying the dose or type of immunosuppressive agents and use of lipid lowering agents. At the start of administration of lipid lowering medications, it is important to monitor drugdrug interactions, especially between lipid lowering agents and immunosuppressive drugs. Furthermore, as combinations of various lipid lowering drugs can lead to severe side effects, such as myopathies and rhabdomyolysis, these combinations should therefore be avoided. To our knowledge, there are no current guidelines targeting the management of lipid metabolism disorders in liver transplant recipients. This paper therefore recommends an approach of managing lipid abnormalities occurring after liver transplantation.

关键词： Liver transplantation Dyslipidemia Lipid management Immunosuppression m TOR-inhibition Treatment