34 research outputs found

    Einfluss der intraoperativen Atemphysiologie auf die Funktion der linksventrikulären Sonde bei kardialer Resynchronisationstherapie

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    Hintergrund: Generalanästhesie mit kontrollierter mechanischer Beatmung beeinflusst die intrathorakalen Druckverhältnisse, Diaphragmabewegungen und die Hämodynamik und könnte so die Funktion der linksventrikulären Sonde nach CRT-Implantation beeinflussen. Diese multizentrische Studie untersucht den Effekt der intraoperativen Atemphysiologie (Spontanatmung = SA vs. kontrollierte mechanische Beatmung = CMV) auf die postoperative LV-Sondenfunktion unter zusätzlicher Berücksichtigung des BMI. Methode: Die CRT-Implantation wurde in 2 Kliniken durchgeführt (92 Patienten Spontanatmung, 73 Patienten CMV). In 2 Nachsorgeuntersuchungen nach 3 ± 5 und 36 ± 53 Tagen wurden die Sondenparameter (FLP) und unerwünschte Ereignisse (Phrenikusstimulation = PNS und Sondendysfunktion) erhoben. Ergebnisse: Bei 36 (21%) Patienten traten unerwünschte Ereignisse auf: bei 26 (15%) PNS und bei 10 (6%) war eine LV-Sondenrevision notwendig. Die intraoperative Atemphysiologie hatte dabei keine Auswirkung auf die postoperative Funktion der LV-Sonde, auch nicht unter Berücksichtigung des jeweiligen BMI. Schlussfolgerung: Die beiden aktuell bei CRT-Implantationen eingesetzten Anästhesieformen (reine Analgosedierung mit Spontanatmung oder Generalanästhesie mit mechanischer Beatmung) können als gleichwertig angesehen werden bzgl. der LV-Sondenfunktion und des Auftretens unerwünschter Ereigniss

    Bloom Filters Optimized Wu-Manber for Intrusion Detection

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    With increasing number and severity of attacks, monitoring ingress and egress network traffic is becoming essential everyday task. Intrusion detection systems are the main tools for capturing and searching network traffic for potential harm. Signature -based intrusion detection systems are the most widely used, and they simply use a pattern matching algorithms to locate attack signatures in intercepted network traffic. Pattern matching algorithms are very expensive in terms of running time and memory usage, leaving intrusion detection systems unable to detect attacks in real-time. We propose a Bloom filters optimized Wu-Manber pattern matching algorithm to speed up intrusion detection. The Bloom filter programs the hash table into a vector, which is quickly queried to exclude unnecessary searches. On average hash table searches are avoided 10.6% of the time. The proposed algorithm achieves a best -case speedup of 66% and worst -case speedup of 33% over Wu-Manber at the cost of 0.33% memory usage increase

    Intelligent Management of Inter-Thread Synchronization Dependencies for Concurrent Programs.

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    Power dissipation limits and design complexity have made the microprocessor industry less successful in improving the performance of monolithic processors, even though semiconductor technology continues to scale. Consequently, chip multiprocessors (CMPs) have become a standard for all ranges of computing from cellular phones to high-performance servers. As sufficient thread level parallelism (TLP) is necessary to exploit the computational power provided by CMPs, most performance-aware programmers need to parallelize their programs. For shared memory multi-threaded programs, synchronization mechanisms such as mutexes, barriers, and condition variables, are used to enforce the threads to interact with each other in the way the programmers intended. However, employing synchronization operations in both correct and efficient way at the same time is extremely difficult, and there have been trade-offs between programmability and efficiency of using synchronizations. This thesis proposes a collection of works that increase the programmability and efficiency of concurrent programs by intelligently managing the synchronization operations. First, we focus on mutex locks and unlocks. Many concurrency bug detection tools and automated bug fixers rely on the precise identification of critical sections guarded by lock/unlock operations. We suggest a practical lock/unlock pairing mechanism that combines static analysis with dynamic instrumentation to identify critical sections in POSIX multi-threaded C/C++ programs. Second, we present Dynamic Core Boosting (DCB) to accelerate critical paths in multi-thread programs. Inter-thread dependencies through synchronizations form critical paths. These critical paths are major performance bottlenecks for concurrent programs, and they are exacerbated by workload imbalances in performance asymmetric CMPs. DCB coordinates its compiler, runtime subsystem, and architecture to mitigates such performance bottlenecks. Finally, we propose exploiting synchronization operations for better energy efficiency through dynamic power management.PhDComputer Science & EngineeringUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/108886/1/netforce_1.pd

    Concurrent Participation in Federally-Funded Welfare Programs and Empowerment toward Economic Self-Sufficiency

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    The purpose of this research was to determine the odds for low-income households to become and remain economically self-sufficient as a result of participating in federallyfunded welfare programs. An evaluation in nature, this study assessed the merits and shortcomings of federally-funded welfare programs. Using the public-use version of the 2008 Survey of Income and Program Participation (SIPP) Panel, this quasi-experimental investigation compartmentalized 4,216 low-income households into two groups: an intervention group (n = 2,436) and a comparison group (n = 1,780). Households in the intervention group received one or more federal means-tested welfare benefits for the most part of the 2008-2013 quinquennium. By contrast, those in the comparison group— although eligible for these benefits—did not receive them. Based on the premises of the theory of policy design and social construction, the culture of poverty theory, the racial classification model, and the social control thesis, the following two hypotheses were formulated: (1) Low-income households who receive one or more lower-tier federal means-tested benefits will be less likely to attain and maintain economic self-sufficiency vii than their counterparts who do not participate in federal welfare programs and (2) Lowincome households that enroll in more welfare programs will have worse self-sufficiency outcomes than their counterparts that participate in fewer programs. The survey respondents were measured repeatedly over a 56-month period to assess whether welfare receipt impacts their household income steadily beyond 150 percent of the federal poverty level, after controlling for known predictors. Findings from binomial logistic regression displayed medium effect sizes indicating that participation in public assistance did decrease the likelihood of attainment and maintenance of economic self-sufficiency among low-income American households. These findings were interpreted within the context of pre-existing differences that may have existed between the intervention group and the comparison group which were not accounted for in the multivariate analysis. Macro-implications of these findings for poverty and social welfare stakeholders were discussed

    The Murray Ledger and Times, July 9, 2008

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    A study of worldwide communications markets: The relationship between federally sponsored research and development and competitiveness of US industry in this market

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    Many factors have been reviewed in an attempt to seek criteria for the establishment of regions or nations as potential customers for space communication systems. These include economic measures, demographic distributions, topographic variations, physical size, national dispersion, telephones available, investment credit viability, and the general level of technology within the population. A major consideration is the fact that essentially all nations are subject to significant financial constraints. Consequently, some form of national investment priorities becomes necessary, and these priorities are generally perceived differently according to the factors mentioned above and also according to the personalities and interests of each nation's decision makers

    The Murray Ledger and Times, November 24, 1990

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    Winona Daily News

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    https://openriver.winona.edu/winonadailynews/2073/thumbnail.jp

    MSFC Skylab Orbital Workshop, volume 2

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    The design and development of the Skylab Orbital Workshop are discussed. The subjects considered are: (1) thrust attitude control system, (2) solar array system, (3) electrical power distribution system, (4) communication and data acquisition system, (5) illumination system, and (6) caution and warning system
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