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Search Results: 1 - 10 of 523 matches for " Stavros; Kotronis "
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Multiple desmoid tumors in a patient with familial adenomatous polyposis caused by the novel W421X mutation Tumor desmoide múltiple en un paciente con poliposis adenomatosa familiar originada por la nueva mutación W421X
Orestis Ioannidis,George Paraskevas,Stavros Chatzopoulos,Anastasios Kotronis
Revista Espa?ola de Enfermedades Digestivas , 2012,
Abstract: Familial adenomatous polyposis (FAP) is a rare syndrome characterized by the presence of hundreds to thousands of colorectal adenomas and is responsible for less than 1% of all colorectal cancers. The syndrome is also characterized by extra-colorectal features including amongst others upper gastrointestinal tract polyps and desmoid tumors. The syndrome is inherited by an autosomal dominant gene, the adenomatous polyposis coli (APC) gene. We present the physical history, clinical presentation, diagnosis and treatment of a patient with a novel germline APC mutation, the W421X mutation, which resulted in FAP presenting with about a hundred colorectal polyps, gastric hyperplastic polyps and multiple aggressive intra-abdominal and extra-abdominal desmoid tumors.
Multiple desmoid tumors in a patient with familial adenomatous polyposis caused by the novel W421X mutation
Ioannidis,Orestis; Paraskevas,George; Chatzopoulos,Stavros; Kotronis,Anastasios; Papadimitriou,Nikolaos; Konstantara,Athina; Makrantonakis,Apostolos; Kakoutis,Emmanouil;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000300009
Abstract: familial adenomatous polyposis (fap) is a rare syndrome characterized by the presence of hundreds to thousands of colorectal adenomas and is responsible for less than 1% of all colorectal cancers. the syndrome is also characterized by extra-colorectal features including amongst others upper gastrointestinal tract polyps and desmoid tumors. the syndrome is inherited by an autosomal dominant gene, the adenomatous polyposis coli (apc) gene. we present the physical history, clinical presentation, diagnosis and treatment of a patient with a novel germline apc mutation, the w421x mutation, which resulted in fap presenting with about a hundred colorectal polyps, gastric hyperplastic polyps and multiple aggressive intra-abdominal and extra-abdominal desmoid tumors.
Acute respiratory failure caused by neglected giant substernal nontoxic goiter
Ioannidis, Orestis;Dalampini, Eleftheria;Chatzopoulos, Stavros;Kotronis, Anastasios;Paraskevas, George;Konstantara, Athina;Papadimitriou, Nikolaos;Makrantonakis, Apostolos;Kakoutis, Emmanouil;
Arquivos Brasileiros de Endocrinologia & Metabologia , 2011, DOI: 10.1590/S0004-27302011000300009
Abstract: substernal goiter is usually defined as a goiter in which the thyroid mass has descended the plane of the thoracic inlet or if more than 50% of the thyroid mass is located below the thoracic inlet. substernal goiters may be asymptomatic or may present with symptoms caused by compression of adjacent organs. acute respiratory failure is rare in cases of substernal goiter. in cases of symptomatic substernal goiter the treatment is surgical by thyroidectomy. we present a rare case of a giant substernal nontoxic goiter which caused acute respiratory failure which was treated by urgent thyroidectomy through a t-incision.
Recurrent small intestine intussusception in a patient with Peutz-Jeghers syndrome
Ioannidis,Orestis; Papaemmanouil,Styliani; Paraskevas,George; Kotronis,Anastasios; Chatzopoulos,Stavros; Konstantara,Athina; Papadimitriou,Nikolaos; Makrantonakis,Apostolos; Kakoutis,Emmanouil;
Revista Espa?ola de Enfermedades Digestivas , 2012, DOI: 10.4321/S1130-01082012000100009
Abstract: peutz-jeghers syndrome is a rare hereditary autosomal dominant disease caused by a mutation of the tumor suppressor gene serine/threonine kinase 11 located in chromosome 19p13.3. it is characterized by the presence of extensive mucocutaneous pigmentation, especially of the lips and the occurrence of hamartomatous polyps throughout the gastrointestinal tract. gastrointestinal hamartomas occur predominantly in the small intestine and can become symptomatic leading usually to intestinal obstruction and abdominal pain. we present a case of recurrent intestinal obstruction caused by small bowel intussusception treated by reduction, enterotomy and polypectomy and followed by intraoperative enteroscopy and endoscopic polypectomy.
Electromagnetic Wave Propagation into Fresh Water  [PDF]
Shan Jiang, Stavros Georgakopoulos
Journal of Electromagnetic Analysis and Applications (JEMAA) , 2011, DOI: 10.4236/jemaa.2011.37042
Abstract: Wireless communications from air to fresh water are studied here. Our analysis relies on plane wave propagation mod-els. Specifically, the transmission loss and propagation loss of RF waves penetrating into fresh water are calculated for various propagation depths. Even though RF wireless communications are not well suited for seawater due to its high attenuation, our paper illustrates that RF communications from air to fresh water are possible. Finally, this work de-rives the optimum frequencies, which provide minimum attenuation and maximum propagation depth, for RF commu-nications from air to fresh water.
Simulation of Olive Kernel Gasification in a Bubbling Fluidized Bed Pilot Scale Reactor  [PDF]
Stavros Michailos, Anastasia Zabaniotou
Journal of Sustainable Bioenergy Systems (JSBS) , 2012, DOI: 10.4236/jsbs.2012.24021
Abstract:

The main aim of this study is to develop a comprehensive process model for biomass gasification in a pilot scale bubbling fluidized bed gasifier using the ASPEN PLUS simulator. A drawback in using ASPEN PLUS is the lack of a library model to simulate fluidized bed unit operation. However, it is possible for users to input their own models, using FORTRAN codes nested within the ASPEN PLUS input file, to simulate operation of a fluidized bed. The products of homogeneous reactions are defined by Gibbs equilibrium and reaction rate kinetics are used to determine the products of char gasification. Governing hydrodynamic equations for a bubbling bed and kinetic expressions for the char combustion were adopted from the literature. Different sets of gasification results for the operation conditions (temperature and air equivalence ratio (ER)) obtained from the our pilot-scale gasifier having a capacity of 1 kg/hr of olive kernel as feeding biomass, were used to demonstrate the validation of the model. The simulation results received from the application of the model were compared with the above experimental results and showed good agreement.

Towards Defeating the Crossfire Attack using SDN
Dimitrios Gkounis,Vasileios Kotronis,Xenofontas Dimitropoulos
Computer Science , 2014,
Abstract: In this work, we propose online traffic engineering as a novel approach to detect and mitigate an emerging class of stealthy Denial of Service (DoS) link-flooding attacks. Our approach exploits the Software Defined Networking (SDN) paradigm, which renders the management of network traffic more flexible through centralised flow-level control and monitoring. We implement a full prototype of our solution on an emulated SDN environment using OpenFlow to interface with the network devices. We further discuss useful insights gained from our preliminary experiments as well as a number of open research questions which constitute work in progress.
An Average Distance Based Self-Relocation and Self-Healing Algorithm for Mobile Sensor Networks  [PDF]
Yipeng Qu, Stavros V. Georgakopoulos
Wireless Sensor Network (WSN) , 2012, DOI: 10.4236/wsn.2012.411037
Abstract: The sensing coverage of a wireless sensor network is an important measure of the quality of service. It is desirable to develop energy efficient methods for relocating mobile sensors in order to achieve optimum sensing coverage. This paper introduces an average distance based self-relocation and self-healing algorithm for randomly deployed mobile sensor networks. No geo-location or relative location information is needed by this algorithm thereby no hardware such as GPS is required. The tradeoff is that sensors need to move longer distance in order to achieve certain coverage. Simulations are conducted in order to evaluate the proposed relocation and self-healing algorithms. An average of 94% coverage is achieved in the cases that we are examined with or without obstacles.
Sonographic evaluation of solid breast nodules
T Stavros
Breast Cancer Research , 2004, DOI: 10.1186/bcr822
Abstract: These studies show that sonography is useful in the characterization of solid breast masses. Characterizing solid breast nodules into BIRADS categories defines carcinomas that might have been missed clinically or mammographically. It identifies a BIRADS 3 group that has far less than 2% risk of being malignant and can offer the patient the option of follow-up rather than biopsy. Currently, approximately 80% of patients with BIRADS 3 solid nodules are electing to be followed rather than to undergo biopsy. It improves the accuracy of the diagnosis of malignant breast lesions. Importantly, it also accurately defines a population of benign solid breast lesions that do not require biopsy when strict sonographic criteria of benignity are present.To achieve the desired sensitivity and negative predictive values of 98% or greater the algorithm must be strictly adhered to. When the patient elects to be followed rather than undergo biopsy, follow-up should be performed in 6 months, not 1 year. The malignant lesions at most risk to be mischaracterized as BIRADS 3 are higher grade invasive ductal carcinomas that grow rapidly enough for change to be readily detected at 6 months.
Comparing the Probability of Unemployment in Southern Greece Vis-à-Vis the Entire Country
Stavros Rodokanakis
Bulletin of Geography. Socio-economic Series , 2009, DOI: 10.2478/v10089-009-0002-5
Abstract: The basic aim of this paper is to investigate the impact that educational level of individuals and participation in training programmes (apprenticeship, intra-firm training, continuing vocational training, popular training) have on their job prospects in Southern Greece (namely the regions of Southern Aegean and Crete) during the implementation of the first Community Support Framework (1989-1993). We also research the differences between the two regions under study and the entire country. We try to see whether the educational level itself and participation in training programmes increased the chances of finding a job. More specifically, we research what are the social and demographic characteristics that increase the chances of someone in the examined population finding a job, how those chances change (if they do) after the introduction of training courses and, also, whether University graduates, in contrast to most of the rest of the EU member states, face greater difficulties in finding a job than non-University graduates, as a series of studies for Greece conclude. To the author's knowledge, this is the first attempt to analyse individual anonymised records (micro-data) from the Labour Force Survey (LFS) for both employed and unemployed in those two regions at NUTS 2 level.
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