Bibliographies thématiques / PmCT

Littérature scientifique sur le sujet « PmCT »

Auteur : Grafiati

Publié le 4 juin 2021

Mis à jour le 25 avril 2022

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Articles de revues sur le sujet "PmCT":

Crainic, Marius, Rui Loja Fernandes et David Martínez Torres. « Poisson manifolds of compact types (PMCT 1) ». Journal für die reine und angewandte Mathematik (Crelles Journal) 2019, n^o 756 (1 novembre 2019) : 101–49. http://dx.doi.org/10.1515/crelle-2017-0006.

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AbstractThis is the first in a series of papers dedicated to the study of Poisson manifolds of compact types (PMCTs). This notion encompasses several classes of Poisson manifolds defined via properties of their symplectic integrations. In this first paper we establish some fundamental properties and constructions of PMCTs. For instance, we show that their Poisson cohomology behaves very much like the de Rham cohomology of a compact manifold (Hodge decomposition, non-degenerate Poincaré duality pairing, etc.) and that the Moser trick can be adapted to PMCTs. More important, we find unexpected connections between PMCTs and symplectic topology: PMCTs are related with the theory of Lagrangian fibrations and we exhibit a construction of a non-trivial PMCT related to a classical question on the topology of the orbits of a free symplectic circle action. In subsequent papers, we will establish deep connections between PMCTs and integral affine geometry, Hamiltonian G-spaces, foliation theory, orbifolds, Lie theory and symplectic gerbes.

Heller, M., H. Vogel, K. Püschel et A. Heinemann. « Post-mortem-Computertomographie (PMCT) und PMCT-Angiographie nach Polytrauma ». Rechtsmedizin 27, n^o 5 (18 août 2017) : 438–42. http://dx.doi.org/10.1007/s00194-017-0187-5.

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Pham, Linda, Jaclyn N. Portelli Tremont, Adam Bruderick, John Nazarian, Pascal Osita Udekwu, Edmund J. Rutherford et Scott M. Moore. « Post-Mortem CT Delivers Fast and Accurate Injury Identification in Trauma Patients ». American Surgeon 88, n^o 5 (20 mars 2022) : 973–80. http://dx.doi.org/10.1177/00031348221078985.

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Background Accurate and timely injury identification is critical but difficult to achieve in trauma patients who die shortly after arrival to the hospital. Autopsy has historically been used to detect injuries, but few undergo formal autopsy. This study investigates the utility of post-mortem computed tomography (PMCT) for injury identification in a diverse trauma population. Methods Cross-sectional study of adult trauma patients who died within 24 hours of arrival to a Level I trauma center were included. Among patients with PMCT, injury severity score (ISS) and number of injuries (NOI) were calculated either from physical exam alone (pre-PMCT) or exam and imaging (post-PMCT). ISS and NOI before and after PMCT were compared. A cause of death analysis was performed for patients who underwent comprehensive (ie, head, neck, and torso) PMCT. Non-parametric repeated measures tests were used, as appropriate. Results 7.3% (N = 28) of patients received PMCT. Compared to pre-PMCT, median ISS (21 vs 3.5) and NOI (5 vs 2) were greater post-PMCT ( P < .001, respectively). Autopsy rate was 13.2% overall; 82.5% of autopsies were due to a penetrating mechanism, and median time to autopsy reporting was 38.5 days. Among 17 patients who received comprehensive PMCT, 64.7% had a single cause of death identified, and the remaining were classified as either multiple potential contributors or unknown. Discussion PMCT is a readily available method to identify injuries in trauma patients who expire shortly upon presentation. Given the low autopsy rate for blunt trauma and delay in reporting, PMCT is an important adjunct for trauma providers.

Hamanaka, Kunio, Kei Nishiyama, Mami Nakamura, Marin Takaso et Masahito Hitosugi. « Both Autopsy and Computed Tomography Are Necessary for Accurately Detecting Rib Fractures Due to Cardiopulmonary Resuscitation ». Diagnostics 10, n^o 9 (15 septembre 2020) : 697. http://dx.doi.org/10.3390/diagnostics10090697.

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Few studies have compared the sensitivities of autopsy and post mortem computed tomography (PMCT) in detecting rib fractures caused by cardiopulmonary resuscitation (CPR). We aimed to compare the characteristics between both modalities for accurately detecting CPR-related rib fractures. This single-centre observational study included adult patients with autopsy records and PMCT scans at our institution from January 2013 to March 2019. CPR-related rib fractures were evaluated using autopsy and PMCT findings. In 62 patients enrolled, 339 rib fractures were detected on autopsy and/or PMCT (222 fractures on both PMCT and autopsy, 69 on PMCT alone, and 50 on autopsy alone). The agreement of detection for both modalities was substantial (kappa coefficient, 0.78). In the logistic regression model, incomplete fractures detected by PMCT and age <75 years were significantly associated with findings that were negative on autopsy but positive on PMCT, while rib number (ribs 1–3 and 7–12) and fracture location (posterolateral and paravertebral) were significantly associated with negative PMCT findings but positive autopsy findings. Autopsy and PMCT showed complementary roles, and are thus necessary in accurately detecting CPR-related rib fractures. Combining both modalities may contribute to improved CPR quality and better understanding of discrepancy in characteristics between the two modalities.

Yamada, Tsuyoshi, Tamaki Takeuchi et Morihiro Ito. « Postmortem Changes in Skeletal Muscle Can Be Expressed by Hounsfield Unit Measurements in Postmortem Computed Tomography—A Murine Model Study ». Journal of Medical Imaging and Health Informatics 9, n^o 2 (1 février 2019) : 261–66. http://dx.doi.org/10.1166/jmihi.2019.2645.

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Purpose: The aim of the present study was to assess time-dependent changes in postmortem images of mouse skeletal muscle that were obtained with a small animal CT scanner. Materials and methods: Mice were euthanized and time-dependent changes in postmortem computed tomography (PMCT) images of skeletal muscle were recorded for 11 elapsed intervals: at the confirmed time of cardiac arrest, and at 0.5, 1, 2, 3, 6, 12, 24, 36, 48, and 72 hours after death. After acquiring PMCT images, skeletal muscle was removed and prepared for histological evaluation. Histological images and PMCT images of the skeletal muscle were then compared. Hounsfield unit (HU) measurements were obtained for the skeletal muscle PMCT images at each interval and time-dependent changes were examined. Results: Time-dependent changes were observed in histological images of skeletal muscle, but not in PMCT images. Time-dependent changes were detectable by HU values of skeletal muscle. Conclusion: Postmortem changes in skeletal muscle tissue appear as decreases in HU values on PMCT.

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Vogel, Beatrice, Axel Heinemann, Axel Gehl, Iwao Hasegawa, Wilhelm-Wolfgan Höpker, Chanasom Poodendaen, Antonios Tzikas et al. « Post-mortem computed tomography (PMCT) and PMCT-angiography after transvascular cardiac intervention ». Archives of Forensic Medicine and Criminology 4 (2013) : 255–66. http://dx.doi.org/10.5114/amsik.2013.46178.

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Filograna, Laura, Guglielmo Manenti, Garyfalia Ampanozi, Antonello Calcagni, Colleen Patricia Ryan, Roberto Floris et Michael John Thali. « Potentials of post-mortem CT investigations during SARS-COV-2 pandemic : a narrative review ». La radiologia medica 127, n^o 4 (28 février 2022) : 383–90. http://dx.doi.org/10.1007/s11547-022-01457-w.

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AbstractIn December 2019, a new coronavirus, SARS-COV-2, caused a cluster of cases of pneumonia in China, and rapidly spread across the globe. It was declared a pandemic by the World Health Organization on March 11th, 2020. Virtual autopsy by post-mortem CT (PMCT) and its ancillary techniques are currently applied in post-mortem examinations as minimally or non-invasive techniques with promising results. In this narrative review, we speculate on the potentials of PMCT and its ancillary techniques, as a viable investigation technique for analysis of suspected or confirmed SARS-COV-2 deaths. An online literature search was performed by using three prefix search terms (postmortem, post-mortem, post mortem) individually combined with the suffix radiology, imaging, computed tomography, CT and with the search terms ‘SARS-CoV-2’ and ‘COVID-19’ to identify papers about PMCT and its ancillary techniques in SARS-COV-2 positive cadavers. PMCT findings suggestive for pulmonary COVID-19 in deceased positive SARS-COV-2 infection are reported in the literature. PMCT ancillary techniques were never applied in such cases. PMCT imaging of the lungs has been proposed as a pre-autopsy screening method for SARS-COV-2 infection. Further studies are needed to ascertain the value of PMCT in determining COVID-19 as the cause of death without autopsy histopathological confirmation. We advocate the application of PMCT techniques in the study of ascertained or suspected SARS-COV-2 infected deceased individuals as a screening technique and as a method of post-mortem investigation, to augment the numbers of case examined and significantly reducing infection risk for the operators.

Noda, Yukihiro, Ken Yoshimura, Shoji Tsuji, Atsushi Ohashi, Hirohide Kawasaki, Kazunari Kaneko, Shigeki Ikeda, Hiroaki Kurokawa et Noboru Tanigawa. « Postmortem Computed Tomography Imaging in the Investigation of Nontraumatic Death in Infants and Children ». BioMed Research International 2013 (2013) : 1–5. http://dx.doi.org/10.1155/2013/327903.

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Objective. To determine the accuracy of postmortem computed tomography (PMCT) for the assessment of causes in nontraumatic deaths in children.Study Design. We enrolled cases of nontraumatic deaths of infants and children who underwent PMCT at a single center. The presumed cause of death determined by PMCT was prospectively compared with the clinical and pathological diagnoses of deaths.Results. Thirty-eight cases were enrolled for analysis. Among them, seven cases also underwent conventional medical autopsy. PMCT revealed an identifiable cause of death in accordance with the clinical diagnosis of death in 16 cases of the 38 cases (the concordance rate was 42%) and in accordance with the autopsy cause of death in four of the seven autopsy cases (the concordance rate was 57%). Among eight cases with unknown cause of death by clinical diagnosis, four cases (50%) were identified with cardiac tamponade as a cause of death (one case) and intracranial hemorrhage suggesting abuse (3 cases).Conclusions. PMCT seems to be a promising technique that might serve as a substitute for conventional medical autopsy and give us the complementary information to clinical diagnoses particularly in cases of child abuse. Larger multicenter trials are worthwhile to validate the general feasibility of PMCT.

Gach, Pierre, Lucile Tuchtan, Julien Mancini, Clémence Delteil, Pierre Massiani, Christophe Bartoli, Marie-Dominique Piercecchi et Guillaume Gorincour. « Correlations of Autopsy and Postmortem CT in Fatal Ballistic Injuries ». Forensic Sciences 2, n^o 1 (26 février 2022) : 190–200. http://dx.doi.org/10.3390/forensicsci2010015.

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Purpose: To study the respective contributions and correlations of autopsy and PMCT in fatal ballistic injuries. Methods: A single-center retrospective descriptive study was carried out over a 10-years period (2008–2017) that included cases of fatal ballistic injuries that had undergone unenhanced PMCT followed by autopsy. In addition to demographics, the main data collected independently at autopsy and PMCT were the number of injuries, their trajectory, distances from the sole of the feet of the entry and exit wounds, projectile caliber and gunshot residue, detailed examination of the injuries, and detection of effusions. Results: Initially, 225 cases were included, of which 158 complete records were analyzed. The mean age of the victims was 41.5 years, and 93% were male. PMCT and autopsy findings were concordant concerning the number of injuries, their trajectory, and distance of the entry and exit wounds from the sole of the feet. Findings were not concordant regarding gunshot residues on the skin (autopsy more efficient) or detection of effusions (PMCT more efficient). The limitations of PMCT were the positioning of the limbs outside the field of acquisition and the impossibility of reliably determining the caliber of the projectiles. Some discrepancies were related to occasionally missing autopsy data, particularly the distance from the sole of the feet or measurements of the volume of effusion. Conclusions: This study provides more detailed knowledge of the accordance of autopsy and PMCT in analyzing fatal ballistic injuries.

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Thèses sur le sujet "PmCT":

Müller, Johannes [Verfasser], et Klaus [Akademischer Betreuer] Püschel. « Fehllagen bei Magensonden im post mortem Computertomogramm (PMCT) / Johannes Müller ; Betreuer : Klaus Püschel ». Hamburg : Staats- und Universitätsbibliothek Hamburg, 2018. http://d-nb.info/1160382328/34.

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Brough, Alison Louise. « The application of post-mortem computed tomography (PMCT) for the anthropological examination of juvenile remains ». Thesis, University of Leicester, 2014. http://hdl.handle.net/2381/29037.

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Post-mortem computed tomography (PMCT) is a non-invasive medical imaging technology that could be a valuable adjunct to traditional techniques in forensic practice. However, despite numerous theoretical advantages, integration of PMCT into forensic pathology, anthropology and odontology is currently restricted by the lack of scientific evidence. This thesis reviews the literature regarding the anthropological investigation of juvenile remains. The experimental chapters use PMCT images of the Scheuer Juvenile Skeletal collection, a unique collection of remains, that span the full age range of the developing human held in Dundee, and cases from the PMCT image archive at the East Midlands Forensic Pathology Unit. Images were acquired using multi-detector CT scanners and analysed using OsiriX three-dimensional imaging software. This thesis considers 1) if anthropological measurements are reproducible using PMCT, 2) if PMCT-derived measurements are accurate, compared with dry bone and orthopantomogram (OPT) examinations 3) what images and data are required to conduct a full anthropological examination to determine an individual’s biological profile using PMCT and finally 4) how to format and display these images appropriately to facilitate data sharing, international interpretation and future development of this method. These techniques were also used in the anthropological investigation of Richard III. Using age as the principle parameter, and assessment of both long bones and dentition, I have shown that 1) measurements used in the most frequently applied forensic anthropology techniques can be extracted from PMCT data, 2) PMCT measurements are accurate, and repeatable by multiple practitioners of various professional backgrounds and experience and 3) the information required to conduct a comprehensive anthropological examination can be condensed into a concise twopage ‘minimum data-set’ form. The results of this thesis provide new evidence to support the implementation of PMCT for anthropological examination in events requiring forensic investigation and disaster victim identification.

Turek, Susanne [Verfasser], et Sonja [Akademischer Betreuer] Kirchhoff. « Evaluation der postmortalen Computertomographie (pmCT) im Vergleich zur Obduktion als Goldstandard bei Polytrauma-Patienten / Susanne Turek ; Betreuer : Sonja Kirchhoff ». München : Universitätsbibliothek der Ludwig-Maximilians-Universität, 2019. http://d-nb.info/1191691470/34.

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Sharafat, Shaghayegh [Verfasser], et Klaus [Akademischer Betreuer] Püschel. « Todesursache Lungenembolie Lungenembolie : Nachweis im Post Mortem-CT (PMCT) und in der Multiphasischen Post Mortem-CT-Angiographie (MPMCTA) / Shaghayegh Sharafat. Betreuer : Klaus Püschel ». Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://d-nb.info/1111778531/34.

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Sharafat, Shaghayegh Verfasser], et Klaus [Akademischer Betreuer] [Püschel. « Todesursache Lungenembolie Lungenembolie : Nachweis im Post Mortem-CT (PMCT) und in der Multiphasischen Post Mortem-CT-Angiographie (MPMCTA) / Shaghayegh Sharafat. Betreuer : Klaus Püschel ». Hamburg : Staats- und Universitätsbibliothek Hamburg, 2016. http://nbn-resolving.de/urn:nbn:de:gbv:18-80137.

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Carneiro, Glauco de Figueiredo. « SourceMiner : Um Ambiente Integrado para Visualização Multi-Perspectiva de Software ». http://wiki.dcc.ufba.br/PMCC/GlaucoCarneiro, 2013. http://wiki.dcc.ufba.br/PMCC/GlaucoCarneiro.

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Submitted by Santos Davilene (davilenes@ufba.br) on 2013-01-25T10:33:56Z No. of bitstreams: 1 Tese Glauco Carneiro.PDF: 9132226 bytes, checksum: b22e5917f0e49a3b66dd4ee4d3aacb13 (MD5)
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Atividades de compreensão têm papel importante em engenharia de software. A leitura e a busca de informações no código fonte não são atividades triviais e requerem esforço significativo em sistemas de médio e grande porte. Atualmente, apesar da maioria dos ambientes de desenvolvimento de software (ADS) oferecer apoio às atividades de compreensão, eles ainda não adotaram plenamente técnicas e recursos de visualização para tal finalidade. Esta é uma limitação significativa dado que o ser humano tem maior capacidade para obter informação através da visão do que todos os outros sentidos combinados. Além disso, as próprias técnicas de visualização de software ainda não adotaram recursos de interação e coordenação já consolidados na área de visualização de informação. Esta tese propõe um ambiente interativo baseado em múltiplas visões chamado SourceMiner, desenvolvido como um plug-in da ADS Eclipse, para apoiar as atividades de compreensão de software. O SourceMiner traz novos recursos e técnicas para a área de visualização de software. O principal destes é o uso de múltiplas visões, já adotadas em visualização de informação e compatibilizadas para visualização de software através do conceito de perspectivas. O ambiente também utiliza mecanismos de coordenação entre as visões, zoom semântico e filtros interativos. O SourceMiner é um ambiente expansível no qual é possível incluir novas visões. Além disso, ele possui recursos de monitoramento de atividades a partir dos quais podem ser realizados estudos para a análise do perfil de uso do ADS e das funcionalidades oferecidas pelo próprio plug-in. A utilização integrada destes recursos é uma contribuição nova para a área de visualização de software. Foram realizados seis estudos experimentais para avaliar o uso do SourceMiner em atividades de compreensão de software. Os resultados indicam que o SourceMiner pode ser utilizado para apoiar a construção de modelos mentais que se adéquam às necessidades de compreensão daqueles que lidam tanto com atividades de desenvolvimento como de manutenção de software.
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Rodrigues, Júnior Methanias Colaço. « Identificação e validação do perfil neurolinguístico de programadores através da mineração de repositórios de software ». http://wiki.dcc.ufba.br/PMCC/MethaniasColaco, 2013. http://wiki.dcc.ufba.br/PMCC/MethaniasColaco.

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Hodiernamente, o processo de desenvolvimento de software pode contar com a utilização de diversas ferramentas de apoio. Os sistemas de controle de versão, as listas de discussão entre as pessoas envolvidas no projeto e os sistemas de rastreamento de erros são usados freqüentemente para ajudar a controlar o andamento de projetos de software, produzindo repositórios de dados históricos. Nos últimos anos, pesquisadores vêm realizando análises lingüísticas nas listas de discussão de projetos de software para compreender as complexidades e especificidades do seu desenvolvimento. Uma abordagem inovadora para isso é usar a Teoria da Neuro-Lingüística. A Neuro-Lingüística postula que indivíduos, em contextos específicos, utilizam um sistema representacional preferencial (SRP) para cognição. Isto significa que apesar de diferentes recursos e canais cognitivos serem usados pelos desenvolvedores para entender o software, existem sistemas representacionais preferidos pelos mesmos. Nesta tese, apresentamos uma ferramenta de análise psicométrica baseada na Neuro-Lingüística (NEUROMINER) para classificar os Sistemas Representacionais Preferidos (SRP) de desenvolvedores de software. A avaliação experimental da abordagem foi realizada em três experimentos que visaram testar a classificação do SRP: (1) Um estudo realizado nas listas de discussão dos projetos do servidor Apache e do PostgreSQL; (2) Uma pesquisa de campo com engenheiros de software para estabelecer quais os tipos de sistemas representacionais são os preferidos pelos mesmos; e (3) Um experimento controlado feito na indústria para avaliação da efetividade da ferramenta neste tipo de ambiente. Os resultados indicaram que a nossa abordagem pode ser usada para classificar engenheiros de software com relação às suas preferências de representação para cognição. Esta classificação pode nortear a alocação de desenvolvedores em tarefas específicas e, possivelmente, melhorar a comunicação em organizações de desenvolvimento de software.
Salvador

Sá, Alirio Santos de. « Mecanismos Autonômicos de Tolerância a Falhas para Sistemas Distribuídos ». http://wiki.dcc.ufba.br/PMCC/AlirioSa, 2013. http://wiki.dcc.ufba.br/PMCC/AlirioSa.

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As facilidades de processamento e comunicação oriundas das novas tecnologias têm promovido o surgimento de uma nova classe de ambientes distribuídos. Estes ambientes são caracterizados pela dinamicidade em suas composições, no provisionamento de seus recursos e nas características e requisitos de suas aplicações. Isto traz novos desafios à confiabilidade, a qual é um atributo essencial à grande maioria dos sistemas distribuídos modernos. Um destes desafios está na incapacidade, dos mecanismos tradicionais de tolerância a falhas, de atender aos requisitos de desempenho, ao mesmo tempo em que suportam a confiabilidade. Isto porque o projeto destes mecanismos requer um conhecimento prévio das características dos ambientes e de suas aplicações, para que possam oferecer configurações adequadas ao atendimento dos requisitos especificados -- isto representa um problema, uma vez que, nos ambientes distribuídos modernos, estas informações mudam dinamicamente. Neste contexto, nem mesmo os mecanismos adaptativos de tolerância falhas obtêm sucesso, pois realizam a sua configuração dinamicamente, mas confiam em comportamentos e requisitos definidos em tempo de projeto. Para enfrentar este desafio, esta Tese introduz os mecanismos autonômicos de tolerância a falhas, baseados em teoria de controle e capazes de se auto-configurar face às mudanças dinâmicas nas características do ambiente ou nos requisitos de suas aplicações. Com o intuito de demonstrar a viabilidade destes mecanismos, foram implementados e avaliados, como estudo de caso, detectores autonômicos de defeitos e protocolos autonômicos de comunicação em grupo, dois mecanismos básicos à construção de muitos sistemas distribuídos confiáveis. Estes mecanismos autonômicos de detecção e de comunicação em grupo são os primeiros da literatura a suportar a auto-configuração em tempo de execução, baseada em requisitos de qualidade de serviço definidos pelos usuários. Tais mecanismos foram avaliados, usando simulações, em condições de carga variadas e falhas. Mesmo sem trabalhos relacionados, para uma comparação direta de desempenho, os mecanismos autonômicos propostos foram comparados com mecanismos tradicionais de tolerância a falhas existentes na literatura. Estes mecanismos tradicionais usaram diferentes configurações definidas por parâmetros manualmente fixados. Os experimentos realizados demonstram que os mecanismos autonômicos propostos possuem, na maioria dos casos, desempenho superior que as diferentes configurações dos mecanismos tradicionais considerados, principalmente quando variações nas características da carga, mudanças nos requisitos ou reconfigurações dinâmicas no ambiente são considerados.
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Regnier, Paul Denis Etenne. « Optimal Multiprocessor Real-Time Scheduling via Reduction to Uniprocessor ». http://wiki.dcc.ufba.br/PMCC/PaulRegnier, 2013. http://wiki.dcc.ufba.br/PMCC/PaulRegnier.

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Neste trabalho de doutorado, propõe-se RUN (Redução para Uniprocessor), um novo algoritmo de escalonamento para conjunto de tarefas periódicas com deadlines implícitas em sistemas multiprocessador de tempo real, nos quais as tarefas possuem restrições tanto no domínio do tempo quanto no domínio de valores. RUN apresenta as seguintes propriedades relevantes: - RUN é ótimo no sentido que ele produz um escalonamento correto, no qual todas as restrições temporais são atendidas, de qualquer sistemas de tarefas utilizando até 100% dos processadores da plataforma de tempo real; - RUN usa o conceito-chave do escalonamento do tempo ócio, chamado de escalonamento por dualidade, segundo o qual, em algum instante t, o escalonamento de uma tarefa utiliza tanto o conhecimento de seu tempo de execução restante, bem como o seu tempo ócio restante; - RUN baseia-se na diminuição do número de tarefas a ser escalonadas pela suas agregações em supertasks, os quais chamamos de servidores, com taxa acumulada não superior a 1. Cada servidor é responsável por escalonar o seu conjunto de tarefas clientes, de acordo com alguma política de escalonamento; - RUN utiliza o princípio original de justiça global (Gfair), de acordo com o qual cada servidor de um conjunto de tarefas T é garantido de executar por um tempo proporcional à taxa acumulada das tarefas de T entre cada duas deadlines das tarefas de T; - RUN reduz o problema do escalonamento de um conjunto de tarefas em/m/ processadores no problema equivalente do escalonamento de um ou mais conjuntos de tarefas diferentes em sistemas monoprocessador; - RUN supera significativamente os algoritmos ótimos existentes em termos de preempções com um limite superior de O(log m) preempções média por jobs em/m/ processadores.
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Beu, Jesse Garrett. « PMPT ? Performance Monitoring PEBS Tool ». NCSU, 2006. http://www.lib.ncsu.edu/theses/available/etd-07262006-133558/.

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For many applications a common source of performance degradation is excessive processor stalling from high memory latencies or poor data placement. Performance degradations from program and memory hierarchy interactions are often difficult for programmers and compilers to correct due to a lack of run-time information or limited knowledge about the underlying problem. By leveraging the Pentium 4 processor's performance monitoring hardware, specific run-time information can be provided, allowing code modifications to reduce or even eliminate problematic code, resulting in reduced execution times.
Furthermore, many tools currently available to aid programmers are program counter centric. These tools point out which area of the code produce slowdowns, but they do not directly show where the problem data structures are. This is a common problem in programs that dynamically allocate memory. By creating a ?malloc-centric? tool, we can develop an interesting perspective of the memory behavior of the system, providing better insight into the sources of performance problems.

Plus de sources

Livres sur le sujet "PmCT":

Kenya. National guidelines, prevention of mother-to-child HIV/AIDS transmission (PMCT). 2^e éd. Nairobi : National AIDS and STD Control Programme, 2002.

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Health, Zambia Ministry of. PMTCT : 2010 national protocol guidelines. Lusaka : Republic of Zambia, Ministry of Health, 2010.

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Carty, Mary T. PMAT : The perfect marriage aptitude test. New York : Glitterati Inc., 2009.

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PMCA. PMCA, back to basics : Confectionery fundamentals. Bethlehem, PA : PMCA, 2007.

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Institute, Project Management. Project manager competency development (PMCD) framework. 2^e éd. Newtown Square, Pennsylvania : Project Management Institute, 2007.

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Santiago, Javier. PMT : La difícil historia. México, D.F : Editorial Posada, 1987.

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Kimmerle, Beth. Sweet times : 100 years of making confections better : a PMCA retrospective. Bethlehem, PA : PMCA, 2007.

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Advani, Suresh, et Kuang-ting Hsiao. Manufacturing techniques for polymer matrix composites (PMCs). Oxford : Woodhead Pub Ltd, 2012.

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Bois, William Pe`ne Du. The Twenty-One Balloons PMC. New York : Penguin USA, Inc., 2009.

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Stewart, Maryon. Beat PMT through diet : The PMT Advisory Service programme based on medically proven treatment. London : Ebury Press, 1987.

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Plus de sources

Chapitres de livres sur le sujet "PmCT":

Morgan, Bruno, Namiko Sakamoto, Seiji Shiotani et Silke Grabherr. « Postmortem Computed Tomography (PMCT) Scanning with Angiography (PMCTA) : A Description of Three Distinct Methods ». Dans Essentials of Autopsy Practice, 1–21. London : Springer London, 2013. http://dx.doi.org/10.1007/978-1-4471-5270-5_1.

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Tagliabracci, A., R. Giorgetti, A. Agostini, M. Cingolani et S. D. Ferrara. « Analysis of D1S80 (pMCT 118) Locus Polymorphism in an Italian Population Sample by the Polymerase Chain Reaction ». Dans Advances in Forensic Haemogenetics, 109–11. Berlin, Heidelberg : Springer Berlin Heidelberg, 1992. http://dx.doi.org/10.1007/978-3-642-77324-2_31.

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Spel, Jip, Sebastian Junges et Joost-Pieter Katoen. « Finding Provably Optimal Markov Chains ». Dans Tools and Algorithms for the Construction and Analysis of Systems, 173–90. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-72016-2_10.

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AbstractParametric Markov chains (pMCs) are Markov chains with symbolic (aka: parametric) transition probabilities. They are a convenient operational model to treat robustness against uncertainties. A typical objective is to find the parameter values that maximize the reachability of some target states. In this paper, we consider automatically proving robustness, that is, an $$\varepsilon $$ ε -close upper bound on the maximal reachability probability. The result of our procedure actually provides an almost-optimal parameter valuation along with this upper bound.We propose to tackle these ETR-hard problems by a tight combination of two significantly different techniques: monotonicity checking and parameter lifting. The former builds a partial order on states to check whether a pMC is (local or global) monotonic in a certain parameter, whereas parameter lifting is an abstraction technique based on the iterative evaluation of pMCs without parameter dependencies. We explain our novel algorithmic approach and experimentally show that we significantly improve the time to determine almost-optimal synthesis.

Donato, Dominique M., Steven K. Hanks, Kenneth A. Jacobson, M. P. Suresh Jayasekara, Zhan-Guo Gao, Francesca Deflorian, John Papaconstantinou et al. « PMCA ». Dans Encyclopedia of Signaling Molecules, 1446. New York, NY : Springer New York, 2012. http://dx.doi.org/10.1007/978-1-4419-0461-4_101067.

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Gooch, Jan W. « PMCA ». Dans Encyclopedic Dictionary of Polymers, 546. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8893.

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Joyce, Philip. « PMCC ». Dans Practical Numerical C Programming, 49–71. Berkeley, CA : Apress, 2020. http://dx.doi.org/10.1007/978-1-4842-6128-6_3.

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Gooch, Jan W. « PMC ». Dans Encyclopedic Dictionary of Polymers, 546. New York, NY : Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_8892.

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Berry, Tony, et Elaine Harris. « PMC ». Dans The Routledge Companion to Performance Management and Control, 501–12. Title : The Routledge companion to performance management and control / edited by Elaine Harris. Description : Abingdon, Oxon ; New York, NY : Routledge, 2017. | Series : Routledge companions in business, management and accounting : Routledge, 2017. http://dx.doi.org/10.4324/9781315691374-28.

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Joyce, Philip. « Correlation and PMCC ». Dans Numerical C, 135–45. Berkeley, CA : Apress, 2019. http://dx.doi.org/10.1007/978-1-4842-5064-8_6.

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Davey, Samuel J., et Han X. Gaetjens. « Maximum Likelihood H-PMHT ». Dans Signals and Communication Technology, 227–33. Singapore : Springer Singapore, 2018. http://dx.doi.org/10.1007/978-981-10-7593-3_10.

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Actes de conférences sur le sujet "PmCT":

Sambasivam, Samuel, et Paul Storey. « Design, Development and Deployment Considerations when Applying Native XML Database Technology to the Programme Management Function of an SME ». Dans InSITE 2005 : Informing Science + IT Education Conference. Informing Science Institute, 2005. http://dx.doi.org/10.28945/2901.

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This paper explores the design and development considerations inherent in the production and deployment of a web-based programme management coordination tool (PMCT) that has been built on a native XML database (NXD). In selecting a small to medium sized enterprise (SME) as a target, specific problems had to be addressed. These practical issues are highlighted along with assessments and analysis of the suitability of the NXD chosen for the function. The paper offers suggestions relating to the cause and effect of underlying trends currently affecting SME’s within the telecommunications sector, and it shows how the management tools and the technologies that they might employ to derive benefit, need careful alignment with the purpose to be effective.

Böven, J., A. Steuwe, J. Morawitz, L. Sawicki, B. Hartung, G. Antoch et J. Aissa. « Anwendbarkeit des Radiologial Alteration Index (RA-Index) in der postmortalen Computertomografie (PMCT) für Säuglinge als Indikator für abnormale Gasverteilung. » Dans 101. Deutscher Röntgenkongress und 9. Gemeinsamer Kongress der DRG und ÖRG. © Georg Thieme Verlag KG, 2020. http://dx.doi.org/10.1055/s-0040-1703132.

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Korhonen, Tuukka, Jeremias Berg et Matti Järvisalo. « Enumerating Potential Maximal Cliques via SAT and ASP ». Dans Twenty-Eighth International Joint Conference on Artificial Intelligence {IJCAI-19}. California : International Joint Conferences on Artificial Intelligence Organization, 2019. http://dx.doi.org/10.24963/ijcai.2019/156.

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The Bouchitté-Todinca algorithm (BT), operating dynamic programming over the so-called potential maximal cliques (PMCs), yields a practically efficient approach to treewidth and generalized hypertreewidth. The enumeration of PMCs is a scalability bottleneck for BT in practice. We propose the use of declarative solvers for PMC enumeration as a substitute for the specialized PMC enumeration algorithms employed in current BT implementations. The presented Boolean satisfiability (SAT) and answer set programming (ASP) based PMC enumeration approaches open up new possibilities for improving the efficiency of BT in practice.

Zhanxian Wang, Wenquan Che, Lixue Zhou et Yumei Chang. « Uncertainty analysis and temperature sensitivity of the complex permittivity measurement of biological tissues using PMCT probes within a wide microwave frequency bands ». Dans 2008 Asia Pacific Microwave Conference. IEEE, 2008. http://dx.doi.org/10.1109/apmc.2008.4958432.

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Harik, V. M., J. R. Klinger, B. K. Fink, T. A. Bogetti, A. Paesano et J. W. Gillespie. « Low Cycle Fatigue of Unidirectional Glass/Epoxy Composites ». Dans ASME 1999 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1999. http://dx.doi.org/10.1115/imece1999-0506.

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Abstract Low cycle fatigue (LCF) behavior of unidirectional polymer matrix composites (PMCs) reinforced with glass fibers is investigated. LCF conditions involve high loads reaching up to 90% of the material ultimate strength. LCF characterization of PMCs is carried out under tension-tension fatigue loading to identify the key physical phenomena occurring in PMCs under LCF conditions and to determine their unique characteristics. Analysis of experimental data indicates that finite strain rates, large strains and stress ratios may affect LCF behavior of PMC structures and the property degradation rates.

Naik, Subhash K., James K. Sutter, Widen Tabakoff, Robert G. Siefker, Harold S. Haller, Randall J. Cupp et Kazuhisa Miyoshi. « Wear Resistant Polymer Matrix Composites for Aerospace Applications ». Dans ASME Turbo Expo 2004 : Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54330.

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Polymer matrix composites (PMCs) are attractive for use in propulsion engine components due to their high specific strength. The use of composites could be even more advantageous if the sand erosion life of the component were extended, thereby reducing maintenance costs. NASA Glenn Research Center (NASA GRC) and Rolls-Royce Corporation have developed erosion resistant coatings that can extend PMC component life and are applicable to current available and advanced high temperature PMCs. This paper describes the performance of SANPRES and SANRES, two similar erosion resistant coating systems that were subjected to engine test conditions on Rolls-Royce AE 3007 engine bypass vanes.

Wilkinson, Michael P., et Marina B. Ruggles-Wrenn. « Mechanical Properties and Fatigue Behavior of 2D Woven PMC and Unitized Composite Airframe Structures at Elevated Temperature ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65763.

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Airframe structures and components on many existing and future Air Force aerospace systems require operation in elevated temperature. Examples include hypersonic vehicle airframes, engine related components (such as engine ducts, engine vanes, and exhaust flaps), and hot trailing edges of B-2 and C-17 wings. Material systems that show improved fatigue performance, excellent thermal resistance, and damage tolerance are prime candidate materials for potential air vehicle structural components. Polymer matrix composites (PMCs) and ceramic matrix composites (CMCs) are two types of composites used in aircraft structures subjected to high temperatures. The polymer matrix in most PMCs cannot withstand the temperatures required for many aerospace structural applications. Therefore, either improvements in temperature capability of polymer matrix materials or developing novel thermal protection systems are desired for elevated temperature applications. Any new material system intended for aerospace applications must be studied and tested to verify that the mechanical properties are sufficient for use in the operating environments. This study investigated the mechanical properties and tension-tension fatigue behavior of two newly developed material systems for use in structures subjected to elevated temperatures, namely a 2D weave PMC and a 2D weave unitized composite (or PMC/CMC, consisting of a PMC co-cured with a CMC layer to act as a thermal barrier). These two material systems are two of three new composites developed under contract through the Air Force Research Laboratory (AFRL) and investigated during a master’s thesis research program at the Air Force Institute of Technology (AFIT) [1]. The 2D PMC investigated in this effort consisted of an NRPE (a high-temperature polyimide) matrix reinforced with carbon fibers. The fiber architecture of the PMC was an 8 harness satin weave fiber fabric. The PMC portion of the unitized composite had the same constituent properties and weave as the aforementioned 2D PMC. The CMC layer consisted of a zirconia-based matrix reinforced with an 8 harness satin weave quartz fiber fabric. For both material systems (PMC and PMC/CMC), material properties were investigated for both on-axis [0°/90°] and off-axis [±45°] fiber orientations. Tensile properties were evaluated at (1) room temperature and (2) with one side of the specimen at 329 °C and the other side exposed to ambient air. Tension-tension fatigue tests were conducted at elevated temperature at a frequency of 1.0 Hz with a ratio of minimum stress to maximum stress of R = 0.05. Fatigue run-out for this effort was defined as 2×105 cycles. Elevated temperature had little effect on the tensile properties of both material systems with the 0°/90° fiber orientation; however, specimens with the ±45° fiber orientation exhibited a significant increase in failure strain at elevated temperature. The ultimate tensile strength (UTS) of the 2D PMC with the ±45° fiber orientation decreased slightly at elevated temperature, but the UTS of the unitized composite with ±45° fiber orientation showed no significant change. The unitized composite did not exhibit an increase in tensile strength and stiffness compared to the 2D PMC. However, the 2D PMC with ±45° fiber orientation produced significantly greater failure strain. The 2D PMC showed slightly better fatigue resistance than the unitized composite with the 0°/90° fiber orientation. For the ±45° fiber orientation, the fatigue limit for the 2D PMC was approximately two times greater than that for the unitized composite. Microstructural investigation of tested specimens revealed delamination in the 2D PMC and very severe delamination in the unitized composite.

Andronic, Larisa. « Impactul destabilizator al infecțiilor virale asupra microsporogenezei la plantele gazdă ». Dans International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.61.

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The pathogenicity reactions described in the sensitive genotypes of tomatoes and barley include specifically changes in the processes of meiotic division, with repercussions in the offspring of infected plants. The percentage of aberrant pollen mother cells (PMCs) in the offspring is at the level of control plants, while the percentage of aberrations per PMC and the frequency of meiotic conjugation are significantly higher. The consequences in meiotic division in virus free progenies reflect the destabilizing transgenerational effect of viral infection on microsporogenesis processes.

Criswell, T., B. S. Majumdar, R. E. Dutton, T. E. Matikas et N. J. Pagano. « The Transverse Interface Strength of the Fiber-Matrix Interface in Polymer Matrix Composites ». Dans ASME 1998 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 1998. http://dx.doi.org/10.1115/imece1998-1171.

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Abstract The transverse tensile strength of the fiber-matrix interface plays an important role in controlling a number of failure modes in polymer matrix composites (PMCs). These include the transverse failure of 90° plies, as well edge delamination in PMC laminates. On the other hand, while significant attention has been focused in the PMC literature on interface shear failure, such as under pull-out conditions, little attention has been focused on the interface tensile strength. In order to avoid edge effects, a cruciform geometry was selected for evaluating the tensile strength. SiC fibers with different types of coatings were evaluated inside an epoxy matrix, and the bond strength was estimated from the mechanical test data. Interface failure was confirmed using optical, dye penetrant, and an ultrasonic shear wave back reflection technique. Tests using straight sided specimens confirmed that singularities at specimen edges have significant influence on interface failure, and hence must be avoided for obtaining valid interface strength data.

BUKENYA, K., M. N. OLAYA, E. J. PINEDA et M. MAIARU. « EFFECT OF BOUNDARY CONDITIONS ON PROCESS- INDUCED STRESSES IN A PLAIN WEAVE UNIT CELL ». Dans Thirty-sixth Technical Conference. Destech Publications, Inc., 2021. http://dx.doi.org/10.12783/asc36/35853.

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Woven polymer matrix composites (PMCs) are leveraged in aerospace applications for their desirable specific properties, yet they are vulnerable to high residual stresses during manufacturing and their complex geometry makes experimental results difficult to observe. Process modeling is needed to characterize the effects of the curing and predict end stress states. Finite element software can be used to model woven architectures, however accurate representation of processing conditions remains a challenge when it comes to selecting boundary conditions. The effect of BCs on process-induced stress within woven PMCs is studied. The commercial Finite Element Analysis (FEA) software Abaqus is coupled with user-written subroutines in a process modeling framework. A two-dimensionally (2D) woven PMC repeating unit cell (RUC) is modeled with TexGen and Abaqus. Virtual curing is imposed on the bulk matrix. The BC study is conducted with Free, Periodic, Flat, and Flat-Free configurations. Results show that the end stress state is sensitive to the boundary condition assumptions. Flat BC results show great agreement with Periodic BCs. Residual stress results from process modeling are then compared with a linear-elastic thermal cooldown analysis in Abaqus. Cooldown results indicate an overestimation in matrix stresses compared with process modeling.

Rapports d'organisations sur le sujet "PmCT":

Kim, Daehyeon, Younjin Shin et Nayyar Siddiki. Geotechnical Design Based on CPT and PMT. West Lafayette, Indiana : Purdue University, 2010. http://dx.doi.org/10.5703/1288284314264.

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Streit, Roy L. Tracking Targets with Specified Spectra Using the H-PMHT Algorithm. Fort Belvoir, VA : Defense Technical Information Center, juin 2001. http://dx.doi.org/10.21236/ada562358.

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Baek, Carolyn, et Naomi Rutenberg. Addressing the family planning needs of HIV-positive PMTCT clients : Baseline findings from an operations research study. Population Council, 2005. http://dx.doi.org/10.31899/hiv14.1000.

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Preventing unintended pregnancy among HIV-positive women is an effective approach to reducing pediatric HIV infection and vital to meeting HIV-positive women’s sexual and reproductive health needs. Although contraceptive services for HIV-positive women is one of the cornerstones of a comprehensive program for prevention of mother-to-child transmission of HIV (PMTCT), a review of PMTCT programs found that implementers have not prioritized family planning (FP). While there is increasing awareness about the importance of FP and HIV integration, data about FP from PMTCT clients are lacking. The Horizons Program is conducting an operations research study testing several community-based strategies to reduce mother-to-child transmission of HIV in a densely settled urban slum in Nairobi, Kenya. Strategies being piloted include moving PMTCT services closer to the population via a mobile clinic and increasing psychosocial support for HIV-positive women. This research update presents key findings about FP at PMTCT sites, including the interaction between providers and clients as well as HIV-positive women’s fertility desires and demand for contraceptives, from the baseline cross-sectional survey and qualitative interviews with postpartum women.

Rutenberg, Naomi, et Carolyn Baek. Review of field experiences : Integration of family planning and PMTCT services. Population Council, 2004. http://dx.doi.org/10.31899/hiv2.1036.

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Kazkaz, K., et E. Swanberg. Survey of Current and Future PMT Replacement Technology. Office of Scientific and Technical Information (OSTI), septembre 2018. http://dx.doi.org/10.2172/1770516.

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Gloyd, Stephen, Julia Robinson, Serge Dali, S. Granato, Rebecca Bartlein, Seydou Kouyate, David Aka, Doroux Billy, Irma Ahoba et Ahoua Kone. PMTCT cascade analysis in Côte d'Ivoire : Results from a national representative sample. Population Council, 2014. http://dx.doi.org/10.31899/hiv9.1004.

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Geppert-Kleinrath, Hermann. PD-PMT successfully obtained first data in NIF GCD. Office of Scientific and Technical Information (OSTI), septembre 2018. http://dx.doi.org/10.2172/1473779.

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Ronzhin, A., M. Albrow, M. Demarteau, S. Pronko, E. Ramberg et A. Zatserklyaniy. Test of timing properties of the Photek 240 PMT. Office of Scientific and Technical Information (OSTI), janvier 2010. http://dx.doi.org/10.2172/975161.

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Kim, Ran Y. Polymer Matrix Composite (PMC) Damage Tolerance and Repair Technology. Fort Belvoir, VA : Defense Technical Information Center, avril 2001. http://dx.doi.org/10.21236/ada400690.

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Granacki, John, et Tauseef Kazi. PMoct : A Policy Management Tool for OCT Based Design Systems for Multiple Domains. Fort Belvoir, VA : Defense Technical Information Center, octobre 1993. http://dx.doi.org/10.21236/ada285822.

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