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Veres A. 64 Dosimetry audits in advanced techniques of radiotherapy – feedback on Equal-Estro experience in Tomotherapy. Phys Med 2019. [DOI: 10.1016/j.ejmp.2019.09.145] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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Hoyuela C, Juvany M, Carvajal F, Veres A, Troyano D, Trias M, Martrat A, Ardid J, Obiols J, López-Cano M. Randomized clinical trial of mesh fixation with glue or sutures for Lichtenstein hernia repair. Br J Surg 2017; 104:688-694. [PMID: 28218406 DOI: 10.1002/bjs.10488] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2016] [Revised: 09/20/2016] [Accepted: 12/09/2016] [Indexed: 11/10/2022]
Abstract
BACKGROUND Pain is the most likely reason for delay in resuming normal activities after groin hernia repair. The primary aim of this study was to determine whether the use of glue to fix the mesh instead of sutures reduced acute postoperative pain after inguinal hernia repair. Secondary objectives were to compare postoperative complications, chronic pain and early recurrence rates during 1-year follow-up. METHODS Some 370 patients who underwent Lichtenstein hernia repair were randomized to receive either glue (Histoacryl®) or non-absorbable polypropylene sutures for fixation of lightweight polypropylene mesh. Postoperative complications, pain and recurrence were evaluated by an independent blinded observer. RESULTS Postoperative pain at 8 h, 24 h, 7 days and 30 days was less when glue was used instead of sutures for all measures (P < 0·001). The operation was significantly quicker using glue (mean(s.d.) 35·3(8·7) min versus 39·9(11·1) min for sutures; P < 0·001). There were no significant differences between the groups in terms of postoperative complications, chronic pain and early recurrence at 1-year follow-up. CONCLUSION Atraumatic mesh fixation with glue was quicker and resulted in less acute postoperative pain than sutures for Lichtenstein hernia repair. Registration number: NCT02632097 (http://www.clinicaltrials.gov).
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Affiliation(s)
- C Hoyuela
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - M Juvany
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - F Carvajal
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - A Veres
- Department of Surgery, Hospital de la Cerdanya, Puigcerdà, Spain
| | - D Troyano
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - M Trias
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - A Martrat
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - J Ardid
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - J Obiols
- Department of General and Digestive Surgery, Hospital Platón, Barcelona, Spain
| | - M López-Cano
- Department of General Surgery, Hospital Universitari Vall d'Hebron, Universitat Autònoma de Barcelona, Barcelona, Spain
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Mohamad Alabdoaburas M, Lefkopoulos D, Mège J, Veres A, Chavaudra J, de Vathaire F, Diallo I. Experimental assessment of peripheral dose in high-energy electron beams used in external radiotherapy. Cancer Radiother 2014. [DOI: 10.1016/j.canrad.2014.07.078] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Affiliation(s)
- A Veres
- 1School of Health Policy & Management, York University, Toronto, ON, Canada
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Alabdoaburas MM, Lefkopoulos D, Bezin J, Mege J, Veres A, De Vathaire F, Diallo I. A semi-empirical model of in-field and out-of-field bremsstrahlung dose distribution in high energy electrons beams used in external radiotherapy. Phys Med 2014. [DOI: 10.1016/j.ejmp.2014.07.180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022] Open
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Guinement L, Marchesi V, Veres A, Lacornerie T, Buchheit I, Peiffert D. [Development of external quality control protocol for CyberKnife beams dosimetry: preliminary tests multicentre]. Cancer Radiother 2013; 17:288-96. [PMID: 23871458 DOI: 10.1016/j.canrad.2013.04.005] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2012] [Revised: 04/09/2013] [Accepted: 04/11/2013] [Indexed: 12/31/2022]
Abstract
PURPOSE To develop an external quality control procedure for CyberKnife(®) beams. This work conducted in Nancy, has included a test protocol initially drawn by the medical physicist of Nancy and Lille in collaboration with Equal-Estro Laboratory. MATERIALS AND METHODS A head and neck anthropomorphic phantom and a water-equivalent homogeneous cubic plastic test-object, so-called "MiniCube", have been used. Powder and solid thermoluminescent dosimeters as well as radiochromic films have been used to perform absolute and relative dose studies, respectively. The comparison between doses calculated by Multiplan treatment planning system and measured doses have been studied in absolute dose. The dose distributions measured with films and treatment planning system calculations have been compared via the gamma function, configured with different tolerance criteria. RESULTS This work allowed, via solid thermoluminescent dosimeter measurements, verifying the beam reliability with a reproducibility of 1.7 %. The absolute dose measured in the phantom irradiated by the seven participating centres has shown an error inferior to the standard tolerance limits (± 5 %), for most of participating centres. The relative dose measurements performed at Nancy and by the Equal-Estro laboratory allowed defining the most adequate parameters for gamma index (5 %/2mm--with at least 95 % of pixels satisfying acceptability criteria: γ<1). These parameters should be independent of the film analysis software. CONCLUSION This work allowed defining a dosimetric external quality control for CyberKnife(®) systems, based on a reproducible irradiation plan through measurements performed with thermoluminescent dosimeters and radiochromic films. This protocol should be validated by a new series of measurement and taking into account the lessons of this work.
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Affiliation(s)
- L Guinement
- Institut de Cancérologie de Lorraine, Avenue de Bourgogne, CS 30519, 54519 Vandœuvre-lès-Nancy, France.
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Bezin J, Benadjaoud MA, Alabdo Aburas MM, Auzac G, Veres A, Lefkopoulos D, Chavaudr J, Bridier A, Deutsch E, de Vathaire F, Diallo I. The use of a graphics library in multisource modelling for head scatter assessment. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Dieng A, Veres A. Radiotherapy dose measurement uncertainty evaluation. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.137] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
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Harangozó T, Pernesz G, Veres A, Tóth-Lencsés K, Heszky L, Kiss E. Assessment of morphological and molecular similarity of Hungarian white grape varieties. Acta Biol Hung 2013; 64:231-48. [PMID: 23739891 DOI: 10.1556/abiol.64.2013.2.9] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The aim of this paper was to find possible link between molecular and morphological similarities of 38 Hungarian white grape varieties. Three aspects of morphological and molecular similarity were assessed in the study: comparison of the ordered variety pairs, assessment of molecular and morphological mean similarity differences and separation of varieties into similar groups by divisive cluster analysis to define (DIANA). Molecular similarity was calculated from binary data based on allele sizes obtained in DNA analysis. DNA fingerprints were determined at 9 SSR loci recommended by the European GrapeGen06 project. Morphological similarity was calculated on the basis of quantitative morphological descriptors. Morphological and molecular similarity values were ordered and categorized after pairwise comparison. Overall correlation was found to be weak but case by case assessment of the variety pairs confirmed some coincidence of molecular and morphological similarity. General similarity position of each variety was characterized by Mean Similarity Index (MSI). It was calculated as the mean of n-1 pair similarity values of the variety concerned. Varieties were ordered and compared by the difference of the index. Five varieties had low morphological and high molecular MSI meaning that they share several SSR marker alleles with the others but seems relatively distinct according to the expression of their morphological traits. Divisive cluster analysis was carried out to find similar groups. Eight and twelve cluster solutions proved to be sufficient to distinct varieties. Morphological and molecular similarity groups partly coincided according to the results. Several clusters reflected parent offspring relations but molecular clustering gave more realistic results concerning pedigree.
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Affiliation(s)
- T Harangozó
- National Foodchain Safety Office, Budapest, Hungary
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Veres A, Snyder M. SU-C-108-04: To Better Understand IMRT and Planned Dose Distributions: A Measure of Entropy. Med Phys 2013. [DOI: 10.1118/1.4813942] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
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Ben Abdennebi A, Auzac G, Chavaudra J, Besbes M, Llanas D, Allodji R, Tao Y, Blanchard P, Veres A, Bridier A, Lefkopoulos D, de Vathaire F, Diallo I. Comparison of dose distribution between intensity modulated radiation therapy and dynamic arc therapy in and out-of-field for prostate cancer treatment plan. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.121] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Marchesi V, Guinement L, Lacornerie T, Buchheit I, Veres A. Definition of action levels for a new external quality control procedure of stereotactic beams on cyberknife. Phys Med 2013. [DOI: 10.1016/j.ejmp.2013.08.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Marchesi V, Guinement L, Veres A, Lacornerie T, Peiffert D, Noel A. EP-1138: Preliminary results of a new external quality control protocol for stereotactic CyberknifeÆ treatments. Radiother Oncol 2013. [DOI: 10.1016/s0167-8140(15)33444-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ruiz-Hernández G, de Juan R, Samanes A, Verea H, Peñas JM, Veres A, Lapeña L, Montz R, Carreras JL. [Positron emission tomography using 18-FDG-PET in radiologically indeterminate pulmonary lesions]. ACTA ACUST UNITED AC 2004; 21:12-6. [PMID: 15195479 DOI: 10.4321/s0212-71992004000100004] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
OBJECTIVE Fluorine-18 deoxyglucose Positron Emission Tomography (FDG-PET) is a non-invasive technique that offers the possibility to define if the radiologically indetermined pulmonary lesions are benign or malignant with high positive and negative predictive values. Considering the indexed literature we can observe that there are few original studies performed with the diagnostic possibilities of our means. For this reason, our main objective is to evaluate the diagnostic accuracy of positron emission tomography in sixty-seven radiologically indetermined pulmonary nodular lesions. MATERIAL AND METHOD Retrospectively, we evaluated the diagnostic ability of FDG-PET globally (by means of visual and semiquantitative analysis) and partially (only considering the Standardized Uptake Value (SUV)), in sixty-seven patients confirmed by pathology or clinical and radiological monitoring, in a time interval superior to one year. RESULTS Globally, FDG-PET had a sensitivity (S) of 92%, specificity (SP) of 86.6%, positive predictive value (PPV) of 89.4%, negative predictive value (NPV) of 89.6% and diagnostic accuracy (DA) of 89%. The best results were obtained for an SUV equal or superior to 2.5. With this value, the clinical efficacy parameters were: S 0.92, SP 0.90, PPV 0.92, NPV 0.90 and DA 0.91. CONCLUSIONS We can characterize most of the radiologically indetermined pulmonary lesions by FDG-PET. The additional use of SUV facilitates an increase in the positive predictive value and specificity of FDG-PET.
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Affiliation(s)
- G Ruiz-Hernández
- Servicio de Medicina Nuclear, Hospital Clínico Universitario, San Carlos.
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Veres A, Nyeste L, Kurucz I, Kirchknopf L, Szigeti L, Holló J. Automated fermentation equipment I. program-controlled fermentor. Biotechnol Bioeng 2004. [DOI: 10.1002/bit.260230213] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Pandey JP, Prohászka Z, Veres A, Füst G, Hurme M. Epistatic effects of genes encoding immunoglobulin GM allotypes and interleukin-6 on the production of autoantibodies to 60- and 65-kDa heat-shock proteins. Genes Immun 2004; 5:68-71. [PMID: 14735152 DOI: 10.1038/sj.gene.6364033] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Immunoglobulin GM and KM genes have been associated with antibody responses to a variety of antigens. A promoter-region polymorphism of interleukin-6 (IL-6) gene (-174 G/C) has been shown to be associated with antibody responses to heat-shock proteins (hsp) 60 and hsp65. To examine the possible epistatic effects of these unlinked genetic systems on the autoimmune responses to hsp60 and hsp65, 176 healthy Caucasian subjects from Finland were genotyped for several allelic determinants of GM, KM, and IL-6 genes by PCR-RFLP methods. IgG antibodies to hsp60 and hsp65 were measured by an ELISA. Significant interactive effects of GM f,z and IL-6-174 genotypes were noted for both anti-hsp60 (P=0.002) and anti-hsp65 (P=0.038) antibody levels. Since these autoantibodies have been implicated in susceptibility to coronary heart disease and carotid atherosclerosis, the associations reported here might be relevant to the etiology of these diseases.
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Affiliation(s)
- J P Pandey
- Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29425, USA.
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Füst A, Veres A, Kiszel P, Nagy ZZ, Cervenak L, Csákány B, Maka E, Süveges I, Grus FH. Changes in tear protein pattern after photorefractive keratectomy. Eur J Ophthalmol 2003; 13:525-31. [PMID: 12948309 DOI: 10.1177/112067210301300603] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
PURPOSE Changes in tear protein composition of patients who underwent photorefractive keratectomy (PRK) were analyzed. METHODS Tear samples were obtained from 23 eyes of 23 patients immediately before PRK and on the fourth postoperative day with glass capillaries. Tear proteins were separated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis. Digital image analysis and evaluation of the densitometric data of the electrophoretic separations were done with BioDoc-Analyze. RESULTS Analysis of discriminance found a significant difference in the protein patterns (p < 0.001). This type of analysis of the electrophoretic densitographs uses all peak information simultaneously. A significant decrease (p < 0.005) in three of the main protein peaks--lactoferrin, immunoglobulin A heavy chain, and lysozyme--was also found after PRK. CONCLUSIONS Excimer laser ablation of the cornea has an acute effect on lacrimal gland protein secretion. Changes in tear composition may lead to feelings of dryness and to a decrease in tear film stability postoperatively.
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Affiliation(s)
- A Füst
- First Department of Ophthalmology, Faculty of Medicine, Semmelweis University, Budapest, Hungary
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Veres A, Szamosi T, Ablonczy M, Szamosi T, Singh M, Karádi I, Romics L, Füst G, Prohászka Z. Complement activating antibodies against the human 60 kDa heat shock protein as a new independent family risk factor of coronary heart disease. Eur J Clin Invest 2002; 32:405-10. [PMID: 12059985 DOI: 10.1046/j.1365-2362.2002.01007.x] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Several groups have reported high levels of antibodies against 60 kDa heat shock proteins (hsp) associated with coronary heart disease. METHODS AND RESULTS Complement activating (CA) antihsp60 autoantibodies were measured by the AtheroRisk kit (CardioPath Ltd, Alloa, UK), in parallel with IgG antibodies to human hsp60 and mycobacterial hsp65 by ELISA in 32 healthy children (18 boys, 14 girls, 11.8 +/- 4.0 years). At least one of the parents of these children had a history of myocardial infarction before 55 years of age (high family risk (HFR) group). The control group consisted of 63 healthy children (31 boys, 32 girls, 9.0 +/- 3.6 years) without known family history of coronary heart disease (CHD), hypertension, and diabetes mellitus. Concentrations of CA antihsp60 antibodies were significantly (P = 0.021) higher in the HFR group than in the control group. Also in the HFR group, significantly (P = 0.004) lower high-density lipoprotein cholesterol (HDL-C)-cholesterol (measured enzymatically) and significantly (P = 0.020) higher low-density lipoprotein cholesterol (LDL-C)-cholesterol levels (calculated by the Friedewald formula) were observed when compared with the controls. The difference in the CA antihsp60 antibody levels between the HFR and control groups remained significant even after adjustments for age, smoking, HDL-cholesterol, LDL-cholesterol levels, and white blood cell count. Children with high (in the highest quartile) CA antihsp60 antibody levels compared with those with normal levels of these antibodies also had adjusted odds ratios (OR) of 9.80 (2.15-44.58, P = 0.003), indicating high family risk. No significant difference in the IgG antihsp antibody levels was observed. CONCLUSIONS These findings indicate that high levels of CA autoantibodies against hsp60 can be considered to be a novel family risk factor of CHD, independent of HDL- and LDL-cholesterol levels.
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Affiliation(s)
- A Veres
- 3rd Department of Medicine, Faculty of Medicine, Semmelweis University, Budapest, Hungary
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Horváth A, Bánhegyi D, Bíró A, Ujhelyi E, Veres A, Horváth L, Prohászka Z, Bácsi A, Tarján V, Romics L, Horváth I, Tóth FD, Füst G, Karádi I. High level of anticholesterol antibodies (ACHA) in HIV patients. Normalization of serum ACHA concentration after introduction of HAART. Immunobiology 2001; 203:756-68. [PMID: 11563675 DOI: 10.1016/s0171-2985(01)80004-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Anticholesterol antibodies (ACHA) are natural antibodies against the 3beta-OH group of cholesterol. Since lipid disorders are common in HIV infection and HAART may further enhance dislipidaemia, we determined by using an ELISA method serum ACHA concentrations in HIV patients and healthy HIV-seronegative controls. ACHA levels were almost 4 times higher in the sera of 46 patients than in 110 controls. No difference in the specificity of ACHA was found between HIV-seropositive and HIV-seronegative sera. Binding of ACHA to cholesterol-coated plates from a HIV-seropositive serum was dose-dependently inhibited by preincubation with HIV-1(BA-L) preparation. Serum concentration of ACHA was significantly higher in the patients with low serum cholesterol levels than in those with normal cholesterol levels. HAART induced a marked drop of ACHA concentration. We found a significant negative correlation between the length of HAART and the ACHA levels. By contrast, HAART did not significantly influence total IgG concentration and titers of antibodies against 60 kD heat shock protein. Our findings indicate that high levels of ACHA in HIV-infection may contribute to the development of hypocholesterolaemia frequently observed in this disease.
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Affiliation(s)
- A Horváth
- 3rd Department of Internal Medicine, Faculty of Medicine, Semmelweis University, Budapest, Hungary
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Abstract
The aim of this study was to explore complement activation in the nasal lavage following a nasal ragweed-allergen challenge. The study was carried out with 15 adolescents who were allergic to ragweed and with six non-allergic healthy volunteers. Following the baseline measurement after the symptoms were registered, subjects were given increasing doses of ragweed allergen. Lavage fluid was collected and tested for a complement-activation product (C3bBbP). The allergic patients responded to allergen provocation with an increase in C3bBbP formation compared to the initial lavage (p = 0.001). The C3bBbP level remained low in the lavage fluids of the non-allergic controls. We found a strong correlation between the threshold dose that induced symptoms and the dose where the maximum complement activation was detected (r = 0.78, p = 0.001). Our findings indicate that in allergic patients nasal challenge with ragweed allergen induces a rise in complement activation in the nasal lavage fluid. These results highlight the role of the complement system in the allergic inflammation on the nasal mucosal surface.
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Affiliation(s)
- G Mezei
- First Department of Pediatrics, Faculty of Medicine, Semmelweis University, Budapest, Hungary.
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Prohászka Z, Veres A, Szamosi T, Ablonczy M, Singh M, Romics L, Füst G. Complement activating antibodies against the 60 kD heat shock proteins as a new and independent family risk factor of coronary heart disease. ATHEROSCLEROSIS SUPP 2001. [DOI: 10.1016/s1567-5688(01)80185-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
This paper analyzes how TCP congestion control can propagate self-similarity between distant areas of the Internet. This property of TCP is due to its congestion control algorithm, which adapts to self-similar fluctuations on several timescales. The mechanisms and limitations of this propagation are investigated, and it is demonstrated that if a TCP connection shares a bottleneck link with a self-similar background traffic flow, it propagates the correlation structure of the background traffic flow above a characteristic timescale. The cut-off timescale depends on the end-to-end path properties, e.g., round-trip time and average window size. It is also demonstrated that even short TCP connections can propagate long-range correlations effectively. Our analysis reveals that if congestion periods in a connection's hops are long-range dependent, then the end-user perceived end-to-end traffic is also long-range dependent and it is characterized by the largest Hurst exponent. Furthermore, it is shown that self-similarity of one TCP stream can be passed on to other TCP streams that it is multiplexed with. These mechanisms complement the widespread scaling phenomena reported in a number of recent papers. Our arguments are supported with a combination of analytic techniques, simulations and statistical analyses of real Internet traffic measurements.
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Affiliation(s)
- A. Veres
- Traffic Laboratory, Ericsson Research, H-1037, Laborc u. 1., Budapest, Hungary
| | - Kenesi S. Molnár
- HSN Laboratory, Dept. of Telecomm and Telematics, Budapest University of Technology and Economics, H-1117, Pázmány P. 1/D, Budapest, Hungary
| | - G. Vattay
- Department of Physics of Complex Systems, Eötvös University, H-1518 Pf. 32, Budapest, Hungary and COMET group, Columbia University, New York, NY
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Sáfár J, Lakosi L, Pavlicsek I, Veres A, Sekine T, Yoshihara K. Integral cross section of the99Tc(γ,γ′)99mTc reaction at 4 MeV. J Radioanal Nucl Chem 1993. [DOI: 10.1007/bf02163493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Puskás G, Veres A, Balazs G, Imre B. [Treatment of recurrent obstructive bronchitis in a subterranean salt mine]. Rev Pediatr Obstet Ginecol Pediatr 1979; 28:361-4. [PMID: 120597] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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