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OALib Journal期刊

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Software Defined Network (SDN) and OpenFlow Protocol in 5G Network  [PDF]
Khaled Alghamdi, Robin Braun
Communications and Network (CN) , 2020, DOI: 10.4236/cn.2020.121002
Abstract: The world is moving at a high speed in the implementation and innovations of new systems and gadgets. 3G and 4G networks support currently wireless network communications. However, the networks are deemed to be slow and fail to receive signals or data transmission to various regions as a result of solving the problem. This paper will analyze the use of Software Defined Network (SDN) in a 5G (fifth generation) network that can be faster and reliable. Further, in Mobile IP, there exist triangulation problems between the sending and receiving nodes along with latency issues during handoff for the mobile nodes causing huge burden in the network. With Cloud Computing and ecosystem for Virtualization developed for the Core and Radio Networks SDN OpenFlow seems to be a seamless solution for determining signal flow between mobiles. There have been a lot of researches going on for deploying SDN OpenFlow with the 5G Cellular Network. The current paper performs benchmarks as a feasibility need for implementing SDN OpenFlow for 5G Cellular Network. The Handoff mechanism impacts the scalability required for a cellular network and simulation results can be further used to be deployed the 5G Network.
A Comparison between Emergency Medicine Residency Training Programs in the United States and Saudi Arabia from the Residents’ Perception
Khaled Alghamdi,Abdulaziz Alburaih,Mary Jo Wagner
Emergency Medicine International , 2014, DOI: 10.1155/2014/362624
Abstract: Objectives. This study was designed to compare the trainees’ perception of emergency medicine (EM) training in the United States (US) and Saudi Arabia (SA) and to identify residents’ levels of confidence and points of satisfaction in education, procedural skills, and work environment. Method. An IRB-exempt anonymous web-based survey was distributed to five EM residency training programs in the USA and three residency regions in SA. Results. 342 residents were polled with a 20% response rate (16.8% USA and 25.8% SA). The Saudi residents responded less positively to the questions about preparation for their boards’ examinations, access to multiple educational resources, and weekly academic activities. The Saudi trainees felt less competent in less common procedures than US trainees. American trainees also more strongly agree that they have more faculty interest in their education compared to the Saudi trainees. The Saudi residents see more patients per hour compared to their US peers. Conclusion. These findings may be due to the differences in training techniques including less formal didactics and simulation experience in SA and more duty hour regulations in the USA. 1. Introduction There is an increasing need for emergency medicine (EM) development and EM trained physicians throughout the world. EM in Saudi Arabia (SA) is based on the North American model and is considered a new specialty which has nonetheless grown dramatically in the last decade [1]. The United States (US) was one of the first countries to establish and recognize EM as a specialty and many countries use this system as a model for EM training. Because EM training is a relatively new endeavor in Saudi Arabia, our aim is to evaluate and compare Saudi and US residents’ level of confidence and satisfaction with their training from trainees’ perspectives. To our knowledge, there are no similar studies reported in the literature, and no studies compare residency training systems between countries. This research contributes to the literature by addressing this gap. 2. Materials and Methods 2.1. Study Design The survey was designed to query the residents on many of the standards for U.S. EM residency training and other important topics. We used many of the questions from the Council of Emergency Medicine Residency Directors (CORD) survey and the Accreditation Council for Graduate Medical Education (ACGME) residents’ survey to establish our survey. The survey was divided into 3 sections: education, clinical skills, and work environment with a total of 17 questions. The study was reviewed by the
Video Assisted Thoracoscopic Surgery Ipisilateral Tran-Mediastianal Approach (Using Alzandi Technique) to Contralateral Lung in Patients with Bilateral Lung Lesions  [PDF]
Hassan Alghamdi
Open Journal of Thoracic Surgery (OJTS) , 2013, DOI: 10.4236/ojts.2013.33017
Abstract: Synchronous lung cancer is considered one of the most difficult resection presentations. Bilateral staged thoractomy still exists as the gold standard, as few cases are reported by using median strenotmy. Video-assisted thoracic surgery (VATS) has gained an important role in routine thoracic surgical practice, and staged VATS resection of bilateral lung cancer has been reported with satisfactory results. From here, we describe a patient with bilateral lung cancer in which we successfully resected the contra lateral lung nodule through the ipsilateral VATS approach. To our knowledge, this is the first report of bilateral lung cancer managed with the ipsilateral trans-mediastinal VATS technique (alzandi technique).
Recurrent Lobar Torsion  [PDF]
Hassan Alghamdi
Open Journal of Thoracic Surgery (OJTS) , 2013, DOI: 10.4236/ojts.2013.34021
Abstract: We report a first case of 180° left upper lobe lung torsion followed by a 90° lobar torsion in the same lobe after a left lower lobectomy.
Composition and Band Gap Controlled AACVD of ZnSe and ZnSxSe1-x Thin Films Using Novel Single Source Precursors  [PDF]
Yousef Alghamdi
Materials Sciences and Applications (MSA) , 2017, DOI: 10.4236/msa.2017.810052
Abstract: Polycrystalline thin films of ZnSe and ZnSxSe1-x have been deposited on glass substrates by Aerosol Assisted Chemical Vapour Deposition (AACVD) from bis(diethyldiselenocarbamato)zinc(II) and a 1:1 and 1:0.75 mixtures of bis(diethyldiselenocarbamato)zinc(II) and bis(diethyldithiocarbamato)zinc(II) as precursors. All films were characterized by p-XRD, SEM, EDX, Raman spectroscopy, photoluminescence (PL and UV/Vis spectroscopy. The band gap of pure ZnSe thin films was found to be 2.25 whereas the band gap of ZnSxSe1-x films varied from 2.55 to 2.66 eV depending on the sulfur content in the films. PL emission spectra showed a clear blue shift for ZnSxSe1-x films compared to ZnSe due to the sulphur content in the films which increase the band gap. The band gap of ZnSSe can be controlled by sulfur to selenium ratio in the alloy. The morphology of the ZnSe thin films changed from small randomly shaped crystallites to triangles whereas the morphology of ZnSxSe1-x was mainly based on cuboids.
Investigating the Influence of Ethical Climate on Trust in Organization and Trust in Supervisor in Albaha Province, Saudi Arabia, Using Victor and Cullen’s Framework  [PDF]
Faris Alghamdi
Journal of Service Science and Management (JSSM) , 2018, DOI: 10.4236/jssm.2018.114027
Abstract: Organizations’ ability to develop trusting relationships is an increasingly significant source of competitive advantage. The current study explores which ethical climate types facilitate and foster higher levels of trust, i.e. trust in one’s supervisor and trust in organization in some public organizations in Albaha province, applying the Victor and Cullen’s (1988) framework of ethical climate. Initial findings of this study showed that most of the participants perceived the presence of caring, laws, and rules climate. Hierarchical multiple regression analyses revealed that laws climate was positively and significantly related to trust in organization, as well as laws and caring climate were positively and significantly related to trust in supervisor. No support was found for any effects of ethical climate types, i.e., instrumentality and independence on trust in organization and trust in supervisor.
Mucosa-Associated Lymphoid Tissue Lymphoma of the Lacrimal Gland: Sustained Remission after Eradication of Helicobacter Pylori Infection
Mohammed Hasosah,Abdullah Baothman,Mohamed Satti,Suzanne Kutbi,Khaled Alghamdi,Kevan Jacobson
Case Reports in Gastrointestinal Medicine , 2011, DOI: 10.1155/2011/945752
Abstract: Mucosa-associated lymphoid tissue (MALT) lymphoma is the third most common non-Hodgkin lymphoma, and it is strongly associated with helicobacter pylori infection of the stomach. MALT lymphoma of the lacrimal gland usually presents as a localized disease process in extranodal tissues. The treatment options of MALT lymphoma of the lacrimal gland chiefly include radiation of the tumor, chemotherapy, surgical removal, or a combination of these strategies. We report a case of localized MALT lymphoma of the lacrimal gland, with prolonged sustained remission after eradication of gastric Helicobacter pylori (H. Pylori) infection. He sustains in remission of lacrimal MALT lymphoma for four years without chemotherapy or radiotherapy.
Adaptive System for Assigning Reliable Students’ Letter Grades—A Computer Code  [PDF]
Saeid A. Alghamdi
Intelligent Information Management (IIM) , 2010, DOI: 10.4236/iim.2010.210066
Abstract: The availability of automated evaluation methodologies that may reliably be used for determining students’ scholastic performance through assigning letter grades are of utmost practical importance to educators, students, and do invariably have pivotal values to all stakeholders of the academic process. In particular, educators use letter grades as quantification metrics to monitor students’ intellectual progress within a framework of clearly specified learning objectives of a course. To students grades may be used as predictive measures and motivating drives for success in a study field. However due to numerous objective and subjective variables that may by be accounted for in a methodological process of assigning students’ grades, and since such a process is often tainted with personal philosophy and human psychology factors, it is essential that educators exercise extra care in maximizing positive account of all objective factors and minimizing negative ramifications of subjectively fuzzy factors. To this end, and in an attempt to make assigning students’ grades more reliable for assessing true-level of mastering specified learning outcomes, this paper will: i) provide a literature review on previous works on the most common methods that have traditionally been in use for assigning students’ grades, and a short account of the virtues and/or vices of such methods, and ii) present a user-friendly computer code that may be easily adapted for the purpose of assigning students’ grades. This would relieve educators from the overwhelming concerns associated with mechanistic aspects of determining educational metrics, and it would allow them to have more time and focus to obtain reliable assessments of true-level of students’ mastery of learning outcomes by accounting for all possible evaluation components.
Enhancement of Quality of Secondary Industrial Wastewater Effluent by Coagulation Process: A Case Study  [PDF]
Hossam Altaher, Ahmed Alghamdi
Journal of Environmental Protection (JEP) , 2011, DOI: 10.4236/jep.2011.29144
Abstract: The local wastewater treatment facility in Yanbu Industrial City receives 24,000 m3/day of industrial wastewater. This wastewater, mostly from refineries and petrochemical industries, goes through physical, biological and chemical stages of treatment. However, the treated water still fails to pass some of the permissible levels set by governmental agencies. This research paper investigated the enhancement of the treatment processes to reduce the turbidity of the effluent treated water. Ferric chloride, ferrous sulfate, alum and commercial synthetic cationic polymer were tried as coagulants. Different conditions (i.e., pH, temperature, dose, stirring rate) were searched. Ferrous sulfate and polymer reduced the final turbidity to acceptable values with very low doses compared with other coagulant.
Developing Systems by Using Object Oriented DatabasePractical Study on ISO 9001:2000 System  [PDF]
Kamel Khoualdi, Thoria Alghamdi
Journal of Software Engineering and Applications (JSEA) , 2011, DOI: 10.4236/jsea.2011.412078
Abstract: Object oriented database OODB is the third generation of databases. It was a natural result of limitations on relational database and increasing requirements of software, and business needs. This paper presents the method to apply OODB on ISO 9001:2000 System. It focuses in analysis and design phase by using Unified Modeling Language UML, and how can represent this type of database. This paper provides comprehensive information about applying OODB on software.
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