Cloud Migration: A Case Study of Migrating an Enterprise IT System to IaaS

This case study illustrates the potential benefits and risks associated with the migration of an IT system in the oil & gas industry from an in-house data center to Amazon EC2 from a broad variety of stakeholder perspectives across the enterprise, thus transcending the typical, yet narrow, financial and technical analysis offered by providers. Our results show that the system infrastructure in the case study would have cost 37% less over 5 years on EC2, and using cloud computing could have potentially eliminated 21% of the support calls for this system. These findings seem significant enough to call for a migration of the system to the cloud but our stakeholder impact analysis revealed that there are significant risks associated with this. Whilst the benefits of using the cloud are attractive, we argue that it is important that enterprise decision-makers consider the overall organizational implications of the changes brought about with cloud computing to avoid implementing local optimizations at the cost of organization-wide performance.Comment: Submitted to IEEE CLOUD 201

Decision Support Tools for Cloud Migration in the Enterprise

This paper describes two tools that aim to support decision making during the migration of IT systems to the cloud. The first is a modeling tool that produces cost estimates of using public IaaS clouds. The tool enables IT architects to model their applications, data and infrastructure requirements in addition to their computational resource usage patterns. The tool can be used to compare the cost of different cloud providers, deployment options and usage scenarios. The second tool is a spreadsheet that outlines the benefits and risks of using IaaS clouds from an enterprise perspective; this tool provides a starting point for risk assessment. Two case studies were used to evaluate the tools. The tools were useful as they informed decision makers about the costs, benefits and risks of using the cloud.Comment: To appear in IEEE CLOUD 201

Does Electroencephalography Contribute to Examining Children with Attention Deficit Hyperactivity Disorder?

How to Cite This Article: Fayyazi A, Khajeh A. Does Electroencephalography Contribute to Examining Children with Attention Deficit Hyperactivity Disorder? Iran J Child Neurol. 2014 Summer;8(3): 65-67.Letter to Editor, Has not abstract.ReferencesSwaiman Kenneth F AS, Ferriero D, Schor N. Pediatric neurology: principles & practice. 5th ed. Philadelphia: Elsevier/Saunders; 2012. p.622-628.Sadock BJ, Sadock VA, Ruiz P, Kaplan HI. Kaplan & Sadock’s comprehensive textbook of psychiatry. 9th ed. Philadelphia: Wolters Kluwer Health/Lippincott Williams & Wilkins; 2009.p.3560-3579.Parisi P, Moavero R, Verrotti A, Curatolo P. Attention deficit hyperactivity disorder in children with epilepsy. Brain & development. 2010;32(1):10-6. Epub 2009/04/17.Laporte N, Sebire G, Gillerot Y, Guerrini R, Ghariani S. Cognitive epilepsy: ADHD related to focal EEG discharges. Pediatric neurology. 2002;27(4):307-11. Epub 2002/11/19.Dunn DW, Kronenberger WG. Childhood epilepsy, attention problems, and ADHD: review and practical considerations. Seminars in pediatric neurology. 2005;12(4):222-8. Epub 2006/06/20.Kattimani S, Mahadevan S. Treating children with attention-deficit/hyperactivity disorder and comorbid epilepsy. Annals of Indian Academy of Neurology. 2011;14(1):9-11. Epub 2011/06/03.Holtmann M, Becker K, Kentner-Figura B, Schmidt MH. Increased frequency of rolandic spikes in ADHD children. Epilepsia. 2003;44(9):1241-4. Epub 2003/08/16.Richer LP, Shevell MI, Rosenblatt BR. Epileptiform abnormalities in children with attention-deficithyperactivity disorder. Pediatric neurology. 2002;26(2):125-9. Epub 2002/03/19.Marston D, Besag F, Binnie CD, Fowler M. Effects of transitory cognitive impairment on psychosocial functioning of children with epilepsy: a therapeutic trial. Developmental medicine and child neurology. 1993;35(7):574-81. Epub 1993/07/01.Fonseca LC, Tedrus GM, Moraes C, Vicente Machado A, Almeida MP, Oliveira DO. Epileptiform abnormalities and quantitative EEG in children with attention-deficit/ hyperactivity disorder. Arquivos de neuro-psiquiatria. 2008;66(3A):462-7. Epub 2008/09/25.Li L, Yang L, Zhuo CJ, Wang YF. A randomised controlled trial of combined EEG feedback and methylphenidate therapy for the treatment of ADHD. Swiss medical weekly. 2013;143:w13838. Epub 2013/08/30.Hughes JR, DeLeo AJ, Melyn MA. The Electroencephalogram in Attention Deficit-Hyperactivity Disorder: Emphasis on Epileptiform Discharges. Epilepsy & behavior : E&B. 2000;1(4):271-7. Epub 2003/03/01.Millichap JG, Millichap JJ, Stack CV. Utility of the electroencephalogram in attention deficit hyperactivity disorder. Clinical EEG and neuroscience. 2011;42(3):180-4. Epub 2011/08/30.Matoth I, Taustein I, Kay BS, Shapira YA. Overuse of EEG in the evaluation of common neurologic conditions. Pediatric neurology. 2002;27(5):378-83. Epub 2002/12/31.Lubar JF, Swartwood MO, Swartwood JN, O’Donnell PH. Evaluation of the effectiveness of EEG neurofeedback training for ADHD in a clinical setting as measured by changes in T.O.V.A. scores, behavioral ratings, and WISC-R performance. Biofeedback and self-regulation. 1995;20(1):83-99. Epub 1995/03/01.Linden M, Habib T, Radojevic V. A controlled study of the effects of EEG biofeedback on cognition and behavior of children with attention deficit disorder and learning disabilities. Biofeedback and self-regulation. 1996;21(1):35-49. Epub 1996/03/01

Comparison of Effectiveness of Topiramate and Diazepam in Preventing Risk of Recurrent Febrile Seizure in Children underAge of 2 Years

  Background and Objective: Febrile seizures are the most common type of convulsions. Medicinal prophylaxis is sometimes used for children at high risk of recurrent febrile seizure. In certain circumstances, conventional drugs such as diazepam and phenobarbital cannot be used and the need for alternative medicines is felt. This study set out to compare the effectiveness of topiramate and diazepam in preventing the risk of recurrent febrile seizure in children under the age of 2 years.Methodology: This was a randomized controlled trial. The research sampleincluded 54 patients, at risk of recurrent febrile seizure,who were inhibited from taking phenobarbital. After selection, they were randomly divided into two groups. The first group received diazepam treatment during fever episodes and the second group received daily dose of topiramate.  A one-year follow-up of recurrent febrile seizure and its complications was also conducted.Findings: Thirty four patients (17 patients in each group) completed the one-year course of the trial. Recurrent febrile seizure was not observed in the course of preventive treatment. The prevalence of minor complications was 29.4% in the diazepam group and 48.5% in the topiramate group.No major complication was observed in among the subjectsConclusion: Topiramate can be recommended for preventing recurrent febrile seizure when the use of front line medicines is not possible

Seizure is a rare presentation for acute hemolysis due to G6PD deficiency. We report a previously healthy boy who presented initially with seizure and cyanosis and subsequently acute hemolysis, due to glucose-6-phosphate dehydrogenase deficiency (G6PD) an

Seizure is a rare presentation for acute hemolysis due to G6PD deficiency. We report a previously healthy boy who presented initially with seizure and cyanosis and subsequently acute hemolysis, due to glucose-6-phosphate dehydrogenase deficiency (G6PD) and probably secondary methemoglobinemia, following the ingestion of fava beans

Bioconcrete: next generation of self-healing concrete

Concrete is one of the most widely used construction materials and has a high tendency to form cracks. These cracks lead to significant reduction in concrete service life and high replacement costs. Although it is not possible to prevent crack formation, various types of techniques are in place to heal the cracks. It has been shown that some of the current concrete treatment methods such as the application of chemicals and polymers are a source of health and environmental risks, and more importantly, they are effective only in the short term. Thus, treatment methods that are environmentally friendly and long-lasting are in high demand. A microbial self-healing approach is distinguished by its potential for long-lasting, rapid and active crack repair, while also being environmentally friendly. Furthermore, the microbial self-healing approach prevails the other treatment techniques due to the efficient bonding capacity and compatibility with concrete compositions. This study provides an overview of the microbial approaches to produce calcium carbonate (CaCO₃). Prospective challenges in microbial crack treatment are discussed, and recommendations are also given for areas of future research

Induced calcium carbonate precipitation using Bacillus species

Microbially induced calcium carbonate precipitation is an emerging process for the production of self-healing concrete. This study was aimed to investigate the effects and optimum conditions on calcium carbonate biosynthesis. Bacilluslicheniformis, Bacillus sphaericus, yeast extract, urea, calcium chloride and aeration were found to be the most significant factors affecting the biomineralization of calcium carbonate. It was noticed that the morphology of microbial calcium carbonate was mainly affected by the genera of bacteria (cell surface properties), the viscosity of the media and the type of electron acceptors (Ca²⁺). The maximum calcium carbonate concentration of 33.78 g/L was achieved at the optimum conditions This value is the highest concentration reported in the literature