Tesis sobre el tema "Breath analysi"
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Blackburn, Gavin J. "Breath analysis : methodology towards a fieldable breath analysis device". Thesis, Loughborough University, 2011. https://dspace.lboro.ac.uk/2134/8518.
Texto completode, Silva Geethanga. "Technological Advancements in Breath Analysis". University of Cincinnati / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1481031554793468.
Texto completoParedi, Paolo. "Exhaled breath analysis in lung disease". Thesis, Imperial College London, 2003. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.406498.
Texto completoQiu, Yihong. "Measurement and analysis of breath sounds". Thesis, University of Glasgow, 2003. http://theses.gla.ac.uk/1676/.
Texto completoHeaney, Liam M. "Exhaled breath analysis in exercise and health". Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/21704.
Texto completoModarreszadeh, Mohammad. "Systems analysis of breath to breath ventilatory variations in man: Role of carbon dioxide feedback". Case Western Reserve University School of Graduate Studies / OhioLINK, 1991. http://rave.ohiolink.edu/etdc/view?acc_num=case1055345140.
Texto completoCummings, Beth L. "Applications of infrared laser spectroscopy to breath analysis". Thesis, University of Oxford, 2011. http://ora.ox.ac.uk/objects/uuid:5b6e0624-5982-457c-b13c-61484bace371.
Texto completoHamblin, D'Nisha D. "Exhaled Breath Analysis of Smokers Using CMV-GC/MS". FIU Digital Commons, 2016. http://digitalcommons.fiu.edu/etd/2605.
Texto completoMeli, Louis Marcel. "Breath analysis : investigation of a low cost FTIR approach". Thesis, Cardiff University, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.316270.
Texto completoKhalid, Tanzeela Yasmin. "Breath analysis for the early recognition of hepatic encephalopathy". Thesis, University of the West of England, Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.573489.
Texto completoLo, Wai. "Breath by breath analysis of breathing pattern in health and disease : a potential outcome measure for breathing retraining?" Thesis, University of Southampton, 2013. https://eprints.soton.ac.uk/351928/.
Texto completoTesfalem, Geremariam Welearegay. "Exhaled Breath Analysis for Non-Invasive Diagnosis of Tropical Diseases". Doctoral thesis, Universitat Rovira i Virgili, 2019. http://hdl.handle.net/10803/665616.
Texto completoLas enfermedades tropicales desatendidas (ETD) pertenecen al grupo de enfermedades infecciosas. Son endémicas en la mayor parte del mundo y afectan a más de mil millones de personas en todo el mundo, especialmente a las poblaciones de bajos ingresos de las regiones en desarrollo. La infección en humanos se caracteriza por un período de incubación asintomática crónica y prolongada sin síntomas notables de la enfermedad, lo que retrasa la prescripción de un tratamiento médico adecuado y oportuno. La prevención, el diagnóstico y el control de estas enfermedades siguen siendo un desafío médico no resuelto aún. Esta tesis ha tenido como objetivo desarrollar una metodología no invasiva, segura y amigable para el paciente para un diagnóstico rápido de las ETD. El enfoque de mi tesis se basó en el diagnóstico de la enfermedad a través del análisis de muestras de aliento exhalado, que son fáciles de obtener y no presentan molestias ni riesgos para la salud de los pacientes. El trabajo de mi tesis se centró en tres tipos diferentes de enfermedades tropicales desatendidas (dengue, equinococosis y leishmaniasis) causadas por tres patógenos diferentes (infecciones virales, helmínticas y protozoarias, respectivamente). Las muestras de aliento se recogieron con dispositivos homologados Bio-VOC, que son fáciles de usar y requieren de una preparación mínima. Para analizar las muestras de aliento, primero se emplearon técnicas analíticas estándar para la identificación de los biomarcadores volátiles de estas enfermedades. Otro de los objetivos de mi tesis fue diseñar y fabricar una matriz de sensores químicos de gases con sensibilidades cruzadas basados en nanopartículas de metal ultrapuro funcionalizadas con diversos compuestos orgánicos, para lo cual empleé una técnica innovadora basada en deposición física en fase vapor. Los nuevos sensores fueron caracterizados y se emplearon para identificar los patrones de las enfermedades estudiadas en las muestras de aliento. Las respuestas de los sensores químicos de gases expuestos a las muestras de aliento se usaron para construir modelos de reconocimiento de patrones para el diagnóstico de estas enfermedades. Los resultados obtenidos han revelado que el análisis del aliento exhalado con una matriz de sensores de gases basados en nanoensamblajes de nanopartículas de metal ultrapur
Neglected Tropical Diseases (NTDs) belong to the group of infectious diseases. They are endemic in most parts of the world, affecting more than one billion people worldwide, especially low income populations from developing regions. The infection to humans is characterized by a chronic and prolonged asymptomatic incubation period without noticeable symptoms of the disease, which delays the prescription of a suitable and timely medical treatment. The prevention, diagnosis and control of these diseases still remain an unsolved medical challenge. This thesis aimed to develop a non-invasive, safe and patient-friendly methodology for rapid diagnosis of NTDs. The thesis approach was based on disease diagnosis via exhaled breath samples analyses, which are easy to obtain and present no discomfort or risk for patients’ health. The thesis work was focused on three different types of neglected tropical diseases (Dengue, Echinococcosis and Leishmaniasis) caused by three different pathogens (viral, helminthic and protozoan infections, respectively). Breath collection was realized with homologated Bio-VOCTM breath samplers, which are simple and user friendly and require minimal training. For analyzing the breath samples, at first standard analytical techniques were employed for the identification of the breath volatile biomarkers of these diseases. As another objective of my thesis, an array of cross reactive chemical gas sensors based on ultrapure metal nanoparticles – ligand nanoassemblies comprising diverse functional organic ligands was designed and fabricated employing an innovative physical deposition route. The new sensors were characterized and employed for the analysis of the breath print profiles of the diseases under study. The responses of the chemical gas sensors to the breath samples were used to build predictive pattern recognition models for the diagnoses of these diseases. The results obtained revealed that exhaled breath analysis with cross reactive gas sensors arrays based on ultrapure metal nanoparticles-ligand nanoassemblies holds significant potential as a cost-effective, simple and non-invasive diagnostic test for NTDs.
Turner, Matthew A. "Boundaries in volatile organic compounds in human breath". Thesis, Loughborough University, 2016. https://dspace.lboro.ac.uk/2134/20274.
Texto completoIbrahim, Baharudin. "Exhaled breath analysis for diagnosis and phenotyping in obstructive lung diseases". Thesis, University of Manchester, 2011. https://www.research.manchester.ac.uk/portal/en/theses/exhaled-breath-analysis-for-diagnosis-and-phenotyping-in-obstructive-lung-diseases(17a130d4-4c44-43af-a006-65939c7315f7).html.
Texto completoLui, Qiao. "Anticipatory breach of contract : A critical analysis". Thesis, University of Oxford, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.530051.
Texto completoPELLEGRINI, RAFFAELLA. "Listen to my breath: Exploring expressive function of breathing sounds in imitation and emotional attunement". Doctoral thesis, Università Cattolica del Sacro Cuore, 2012. http://hdl.handle.net/10280/1271.
Texto completoSeveral psycho-physiological studies have provided evidences about the reciprocal influence between respiration and psychological variables but few attentions have been brought to the investigation of the expressive function of breathing sounds. Study 1 aims to build a multilayer analysis model that enable an acoustic description of breathing sounds. Audio and video recordings of breathing of two pairs of participants engaged in individual and joint performance were conducted. 1903 were video and audio analyzed and 3 sets of indexes were derived: respiratory, acoustic and interactive (aimed to relate partner’s respiratory behaviour during joint performances). Study 2 investigates what could be inferred about a person’s identity, emotional state and activity from the sound of his/her breathing. Moreover, it aims to verify whether imitation of breathing patterns improve the identification of those features. Ecological recordings of breathing sounds of people engaged in 6 activities and 4 emotions. 90 participants listen to the tracks and answer a questionnaire about such variables. Other 90 mimicked the tracks before answering. Participants were able to infer valuable information about the aspects under investigation with better results in the imitation task. Study 3 aims to describe the acoustic features of 6 emotional breathing patterns (anger, fear, sadness, disgust, tenderness and joy) and to see whether breathing together could strengthen the attunement process. 20 pairs of women participated. For each emotion, within the pair one participant read a story emotionally connoted and breathes as if she actually was in that situation. Her partner had to convey her closeness breathing in the same way. Finally they filled in a questionnaire. Different respiratory patterns were related to each emotion. Moreover the task influenced several attunement dimensions: synchronization, emotional decoding, emotional experience and perception of interpersonal similarity.
PELLEGRINI, RAFFAELLA. "Listen to my breath: Exploring expressive function of breathing sounds in imitation and emotional attunement". Doctoral thesis, Università Cattolica del Sacro Cuore, 2012. http://hdl.handle.net/10280/1271.
Texto completoSeveral psycho-physiological studies have provided evidences about the reciprocal influence between respiration and psychological variables but few attentions have been brought to the investigation of the expressive function of breathing sounds. Study 1 aims to build a multilayer analysis model that enable an acoustic description of breathing sounds. Audio and video recordings of breathing of two pairs of participants engaged in individual and joint performance were conducted. 1903 were video and audio analyzed and 3 sets of indexes were derived: respiratory, acoustic and interactive (aimed to relate partner’s respiratory behaviour during joint performances). Study 2 investigates what could be inferred about a person’s identity, emotional state and activity from the sound of his/her breathing. Moreover, it aims to verify whether imitation of breathing patterns improve the identification of those features. Ecological recordings of breathing sounds of people engaged in 6 activities and 4 emotions. 90 participants listen to the tracks and answer a questionnaire about such variables. Other 90 mimicked the tracks before answering. Participants were able to infer valuable information about the aspects under investigation with better results in the imitation task. Study 3 aims to describe the acoustic features of 6 emotional breathing patterns (anger, fear, sadness, disgust, tenderness and joy) and to see whether breathing together could strengthen the attunement process. 20 pairs of women participated. For each emotion, within the pair one participant read a story emotionally connoted and breathes as if she actually was in that situation. Her partner had to convey her closeness breathing in the same way. Finally they filled in a questionnaire. Different respiratory patterns were related to each emotion. Moreover the task influenced several attunement dimensions: synchronization, emotional decoding, emotional experience and perception of interpersonal similarity.
Wong, Hon-wai Francis y 黃漢偉. "Breath hydrogen (H2) analysis for detecting lactose malabsorption in Chinese children". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 1988. http://hub.hku.hk/bib/B31208976.
Texto completoGuo, Tianle. "Chemical Analysis of Exhaled Breath by Means of Terahertz Rotational Spectroscopy". Wright State University / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1408732018.
Texto completoSchueler, Robert M. "Terahertz Spectroscopic Breath Analysis as a Viable Analytical Chemical Sensing Technique". Wright State University / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=wright1464170300.
Texto completoMa, Xinyi. "The effect of the random breath testing policy in Australia". Thesis, The University of Sydney, 2013. http://hdl.handle.net/2123/10281.
Texto completoReinoso, Luis Enrique. "User interface optimization through breadth of distribution analysis". Monterey, California. Naval Postgraduate School, 1997. http://hdl.handle.net/10945/9116.
Texto completoA Java tutorial was developed as a World Wide Web (WWW) site for use in capturing user behavior data. Breadth of distribution analysis was then applied to the data collected in order to characterize the usage of the user interface through the shape, connectedness, and order of traversal of each user in the sample. The results reveal distinct user groups with different levels of user knowledge and needs in relation to the web site content The resulting user interface analysis process produces a set of recommendations for optimizing the user interface, including adaptive interfaces for different user subgroups and optimization of sequential rather than topical presentations
Langley, Cathryn Elinor. "Development of techniques for trace gas detection in breath". Thesis, University of Oxford, 2012. http://ora.ox.ac.uk/objects/uuid:58ceee0c-18f7-4bfc-adfb-829d24859564.
Texto completoDufaye, Guillaume. "Modélisation mécanique et numérique du comportement des bustes féminins". Thesis, Troyes, 2014. http://www.theses.fr/2014TROY0037/document.
Texto completoAdvanced modeling of female bust behaviour in static or dynamic must consider the biological of each components of the breast. The numerical simulation of breast deformation enables the development of new techniques for confections corsetry or new medical devices, including screening for breast cancer. In this study, an experimental-simulation-optimization approach that takes into account the components (skin, fat and glands) responsible for the deformability of the breast under the gravity loading is proposed. Geometrical models were generated from MRI images for 3D reconstruction of internal components is used with using advanced adaptive mesh surface and volume for purposes of finite element simulations using Comsol Multiphysics. Experimental tests are developed using a 3D scanner cameras and a special gear for study the busts deformability in static and dynamic. Numerical hyperelastic models of Comsol Multiphysics FEA are using for breasts deformation to characterize and optimize with reverse approach the breast mechanical properties. Confrontation with experimental and literature results is proposed in order to demonstrate the efficiency of our approach
Alklid, Jonathan. "Twitch, a Breath of Fresh Air? : An Analysis of Sexism on Twitch.tv". Thesis, Linnéuniversitetet, Institutionen för språk (SPR), 2015. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-40326.
Texto completoSadhu, Vijay. "Internal erosion and simplified breach analysis: (upgraded version 2012)". Kansas State University, 2012. http://hdl.handle.net/2097/13923.
Texto completoDepartment of Computing and Information Sciences
Mitchell L. Neilsen
In recent years, headline news has been overwhelmed with stories about dam and levee failures including the 2005 levee breaches in New Orleans and the 2006 Kaloko Damfailure in Hawaii that resulted in seven deaths. Since 2000, state and federal agencies have reported 92 dam failures in the United States to the National Performance of Dams Program. Incidents such as these have brought both national and worldwide attention to the need for improved flood warning systems and breach prediction tools for dam embankment and levee failures. (G. J. Hanson, 2010) IESIMBA 2012 is an upgraded version of SIMBA, which has been upgraded from VB6 to C#.NET. The Microsoft Windows-based SIMplified Breach Analysis software (SIMBA) was developed by the USDA Agricultural Research Service in cooperation with Kansas State University. The software was developed for the purpose of analyzing internal erosion, earth embankment breach test data and extending the understanding of the underlying physical processes of breach of an overtopped earth embankment. It is a research tool that is modified routinely to test the sensitivity of the output to various sub-models and assumptions. This software is a test version for use in validation testing of the simplified breach model based on stress and mass failure driven headcut movement. It runs under Microsoft Windows 98SE, Windows 2000, NT, XP, or Vista. The following Input Screens are used to guide the user through development of input data sets. Model Properties , Dam Profile , Structure Table, Spillway Rating and Hydrograph Data After an input data set has been entered, the data is saved and simulation can be performed on the data stored in memory at any time by selecting Build option. Input and output files are stored in a fixed ASCII text format. The results of the simulation can be viewed in graphical format which are of interest to the researchers at Oklahoma State University, Stillwater by selecting View option.
Galletti, Thomas. "Data breach - services for threat detection, analysis and response". Master's thesis, Alma Mater Studiorum - Università di Bologna, 2014. http://amslaurea.unibo.it/7026/.
Texto completoYang, Chi-ting y 楊志婷. "Pharmacokinetics of alcohol using breath measures and some statisticalaspects in forensic science". Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2011. http://hub.hku.hk/bib/B46506159.
Texto completoSmith, Aaron D. "Stochastic permanent breaks /". Diss., Connect to a 24 p. preview or request complete full text in PDF format. Access restricted to UC campuses, 1999. http://wwwlib.umi.com/cr/ucsd/fullcit?p9938588.
Texto completoKaisdotter, Andersson Annika. "Improved breath alcohol analysis with use of carbon dioxide as the tracer gas". Doctoral thesis, Mälardalens högskola, Akademin för innovation, design och teknik, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:mdh:diva-9743.
Texto completoLiu, Haixia. "Texture Feature Analysis of Breast Lesions in Automated 3D Breast Ultrasound". Thesis, Uppsala universitet, Institutionen för informationsteknologi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-211923.
Texto completoMuthukaruppan, Anita. "Gene expression analysis in breast cancer". Thesis, University of Auckland, 2011. http://hdl.handle.net/2292/6997.
Texto completoWalsh, Tomas. "Molecular analysis of early breast cancer". Thesis, University of Leicester, 1997. http://hdl.handle.net/2381/29525.
Texto completoMakriyianni, Ioli. "Mutation analysis of hereditary breast cancers". Thesis, McGill University, 2005. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=98760.
Texto completoEGFR background. Recent studies have identified mutations in the tyrosine kinase (TK) domain of the epidermal growth factor receptor (EGFR) in lung carcinomas. These mutations make the tumors sensitive to a molecular targeted drug called getifinib. Methods. We also sequenced the TK domain of EGFR in 16 breast cancer patients (BRCA1 = 9, BRCA2 = 4, non-carriers = 3) for mutations. Results. We did not find mutations reported previously in lung carcinomas but we identified other variants, in exons 18, 20 and 21 of the mutation carvers. We found one out of thirteen (eight percent) of the BRCA1/BRCA2 mutation carriers had somatic tumor variants, three out of thirteen (23%) patients had somatic variants found only in the adjacent normal tissue, and four out of thirteen (31%) patients had germ-line variants. The non-carriers did not have any variants. The variants found in the exons were two missense variants in exon 18 of two patients, three 'silent' substitutions in exon 20 of three patients, and two patients had exon 21 variants; a missense variant and a 'silent' substitution. Intronic variants were also found in three patients. Patient 5420 harbored more than one variant in the tumor tissue and patient 5483 harbored more than one somatic variant in the adjacent normal tissue. Although the sample size is small, these preliminary results seem to show a difference in EGFR variants between BRCA1/BRCA2 mutation carriers and non-carriers. Conclusion . EGFR variants found in this study were not the same ones found in lung cancer, but other variants could be significant in breast cancer progression and could possibly represent drug targets for future therapy.
Amaral, Telmo. "Analysis of breast tissue microarray spots". Thesis, University of Dundee, 2010. https://discovery.dundee.ac.uk/en/studentTheses/0a83915d-2f11-4b89-9c24-8dc3c15346f2.
Texto completoWilson, Kelly A. "Finite Element Analysis of Breast Implants". Thesis, Virginia Tech, 1999. http://hdl.handle.net/10919/32972.
Texto completoMaster of Science
Round, A. R. "Ultra-structural analysis of breast tissue". Thesis, Cranfield University, 2007. http://hdl.handle.net/1826/2057.
Texto completoLiu, Zhenzhen. "Hydro-mechanical analysis of breach processes due to levee failure". Thesis, Aix-Marseille, 2015. http://www.theses.fr/2015AIXM4726/document.
Texto completoThe failure of embankment dams and levees can have serious consequence in floodplains. Hydro-mechanical analyses of the breach processes were conducted to develop the accurate estimation of the failure of embankment dams and levees. Considering the internal erosion process, a pipe enlargement model was proposed to simulate the failure of embankment dams and levees by concentrated leak erosion. In this model, the turbulent pipe flow with erosion mechanism was employed as well as the soil erosion law. Considering the breach enlargement process, a simple headcut migration model based on the soil tensile strength was presented to simulate the critical length of the headcut. Good agreements were obtained by comparing with the limit equilibrium numerical model. A simple model was eventually proposed to simulate the lateral shear stress on the breach sides, accounting for the secondary flow. The lateral shear stress can be greater than the bottom shear stress, depending on the situation. . Finally, a large-scale test of dam failure was simulated by using the pipe enlargement and some components of the breach widening models proposed. The simulation of the pipe enlargement process had good agreement with the measured data. Both of the pipe diameter and the discharge flow were well simulated. The stepwise enlargement of the breach width was also well simulated at the beginning of the breach widening process. Validation and application prospects of the proposed models are discussed
Chow, Kam Kong. "A raman cell based on hollow core photonic crystal fibre for human breath analysis". Thesis, University of British Columbia, 2012. http://hdl.handle.net/2429/43593.
Texto completoAma, Obinna Henry. "Novel K2W7O22/Ti3C2 Nanocomposite-Based Sensor Device for Breath Acetone Analysis in Diabetic Patients". Thesis, North Dakota State University, 2020. https://hdl.handle.net/10365/31828.
Texto completoThomas, Jessica Rose. "Assessment of the Applicability of Terahertz Spectroscopic Breath Sensing towards Monitoring Type 1 Diabetic Mellitus". Wright State University / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=wright1440613521.
Texto completoHayton, Paul M. "Analysis of contrast-enhanced breast MR images". Thesis, University of Oxford, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298777.
Texto completode, Pasquale Francesco. "Analysis of dynamic magnetic resonance breast images". Thesis, University of Plymouth, 2004. http://hdl.handle.net/10026.1/2351.
Texto completoLee, Justin Wu. "Computational imaging and analysis in breast cancer". Thesis, Massachusetts Institute of Technology, 2018. http://hdl.handle.net/1721.1/115703.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (pages 125-136).
The conventional pathologic analysis of malignancies involves a qualitative characterization and integration of several factors including tumor size, general degree of differentiation, tumor heterogeneity, mitotic rate, and lymphovascular invasion. For some cancers, biomarkers such as hormone receptor expression or receptor kinase over-expression can provide additional prognostic and therapeutic guidance. Unfortunately, all of these qualitative histologic approaches, while generally accepted for directing patient care, often exhibit significant inter-observer variability resulting in inconsistent inter- and intra-institutional predictions of tumor behavior (including metastases and/or recurrence), resulting in incorrect diagnoses or treatment. Because cellular morphology is an integrated reflection of genetic and epigenetic expression, we hypothesize that a more accurate quantitative accounting and measurement of histologic features can provide a more robust and reliable prediction of tumor behavior. Computational imaging utilizes software to augment or replace the role of traditional optical elements in imaging systems and has an ability to significantly increase the accuracy, robustness and cost-efficiency of digital pathology. In this thesis, we develop and test three novel computational imaging algorithms including, to the best of our knowledge, the first system for lensless computational imaging through deep learning. We then test our hypothesis by applying augmented image retrieval, analysis algorithms, and machine learning on a validated dataset of breast cancer images where the clinical outcomes of the primary tumor are known. In particular, we analyze algorithms related to identifying mitoses as a central proof of concept.
by Justin Lee.
Ph. D. in Biomedical Engineering
Ashok, Mahima. "Analysis of HER2 testing in breast cancer". Diss., Atlanta, Ga. : Georgia Institute of Technology, 2009. http://hdl.handle.net/1853/29711.
Texto completoCommittee Chair: Griffin, Paul; Committee Member: Butera, Robert; Committee Member: Halpern, Michael; Committee Member: Nichols, Richard; Committee Member: Vidakovic, Brani. Part of the SMARTech Electronic Thesis and Dissertation Collection.
Gabrovska, Plamena N. "Gene Expression Analysis in Human Breast Cancer". Thesis, Griffith University, 2012. http://hdl.handle.net/10072/367577.
Texto completoThesis (PhD Doctorate)
Doctor of Philosophy (PhD)
School of Medical Science
Griffith Health
Full Text
De, Biase Dario <1982>. "Molecular analysis of special type breast carcinomas". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2363/1/de_Biase_Dario__Tesi_Dottorato.pdf.
Texto completoDe, Biase Dario <1982>. "Molecular analysis of special type breast carcinomas". Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2010. http://amsdottorato.unibo.it/2363/.
Texto completoSchardl, Tao Benjamin. "Design and analysis of a nondeterministic parallel breadth-first search algorithm". Thesis, Massachusetts Institute of Technology, 2010. http://hdl.handle.net/1721.1/61575.
Texto completoCataloged from PDF version of thesis.
Includes bibliographical references (p. 75-77).
I have developed a multithreaded implementation of breadth-first search (BFS) of a sparse graph using the Cilk++ extensions to C++. My PBFS program on a single processor runs as quickly as a standard C++ breadth-first search implementation. PBFS achieves high workefficiency by using a novel implementation of a multiset data structure, called a "bag," in place of the FIFO queue usually employed in serial breadth-first search algorithms. For a variety of benchmark input graphs whose diameters are significantly smaller than the number of vertices - a condition met by many real-world graphs - PBFS demonstrates good speedup with the number of processing cores. Since PBFS employs a nonconstant-time "reducer" - a "hyperobject" feature of Cilk++ - the work inherent in a PBFS execution depends nondeterministically on how the underlying work-stealing scheduler load-balances the computation. I provide a general method for analyzing nondeteriministic programs that use reducers. PBFS also is nondeterministic in that it contains benign races which affect its performance but not its correctness. Fixing these races with mutual-exclusion locks slows down PBFS empirically, but it makes the algorithm amenable to analysis. In particular, I show that for a graph G = (V, E) with diameter D and bounded out-degree. this data-race-free version of PBFS algorithm runs in time O((V +E)/P+DIg[supercript 3] (V/D)) on P processors, which means that it attains near-perfect linear speedup if P < (V +E)/DIg[supercript 3] (V/D).
by Tao Benjamin Schardl.
M.Eng.
McGill, Matthew C. "An Analysis of Contracting and Breach Decisions Under Various Damage Remedies". Ohio University Honors Tutorial College / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=ouhonors1492777267852137.
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