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Search Results: 1 - 10 of 144932 matches for " Robert T. Collins "
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RISN: An Efficient Sensor Network Overlay with Support for Autonomous and Distributed Applications  [PDF]
Evens Jean, Ingmar Rauschert, Robert T. Collins, Ali R. Hurson, Sahra Sedigh, Yu Jiao
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2011, DOI: 10.4236/ijcns.2011.41001
Abstract: Once deployed, sensor networks are capable of providing a comprehensive view of their environment. However, since the current sensor network paradigm promotes isolated networks that are statically tasked, the full power of the harnessed data has yet to be exploited. In recent years, users have become mobile enti-ties that require constant access to data for efficient and autonomous processing. Under the current limita-tions of sensor networks, users would be restricted using only a subset of the vast amount of data being col-lected; depending on the networks they are able to access. Through reliance on isolated networks, prolifera-tion of sensor nodes can easily occur in any area that has high appeals to users. Furthermore, support for dy-namic tasking of nodes and efficient processing of data is contrary to the general view of sensor networks as subject to severe resource constraints. Addressing the aforementioned challenges requires the deployment of a system that allows users to take full advantage of data collected in the area of interest to their tasks. Such a system must enable interoperability of surrounding networks, support dynamic tasking, and swiftly react to stimuli. In light of these observations, we introduce a hardware-overlay system designed to allow users to efficiently collect and utilize data from various heterogeneous sensor networks. The hardware-overlay takes advantage of FPGA devices and the mobile agent paradigm in order to efficiently collect and process data from cooperating networks. The computational and power efficiency of the prototyped system are herein demonstrated. Furthermore, as a proof-of-concept, we present the implementation of a distributed and autonomous visual object tracker implemented atop the Reconfigurable and Interoperable Sensor Network (RISN) showcasing the network’s ability to support ad-hoc agent networks dedicated to user’s tasks.
Heinrich’s Fourth Dimension  [PDF]
Robert L. Collins
Open Journal of Safety Science and Technology (OJSST) , 2011, DOI: 10.4236/ojsst.2011.11003
Abstract: In this article, the author uses accident data readily available from the United States Bureau of Labor Statistics to create a New Incident Pyramid, a modern day equivalent of Heinrich’s Triangle. This historical data is then combined with generally accepted statistical methods to show that the relationship between incident types first envisioned by Herbert William Heinrich in 1931 has a fourth dimension, time. Using statistical analysis methods derived from both a Binomial distribution and a Poisson distribution, this analysis will show how information derived from these accident summaries can be used to predict potential future events. The obvious conclusion reinforced by this analysis will be that the future date for potentially fatal accidents can only be delayed by focusing on accident prevention strategies that address all incidents without regard for the type of resulting injury. This analysis can be used by safety professionals to predict potential future outcomes for their establishments which can then be used to better communicate the need for improvements in accident prevention programs.
Comparative mortality of hemodialysis patients at for-profit and not-for-profit dialysis facilities in the United States, 1998 to 2003: A retrospective analysis
Robert N Foley, Qiao Fan, Jiannong Liu, David T Gilbertson, Eric D Weinhandl, Shu-Cheng Chen, Allan J Collins
BMC Nephrology , 2008, DOI: 10.1186/1471-2369-9-6
Abstract: Our primary objective was to compare the mortality hazards of patients initiating hemodialysis at for-profit and not-for-profit centers in the United States between 1998 and 2003. For-profit status of dialysis facilities was determined after subjects received 6 months of dialysis therapy, and mean follow-up was 1.7 years.Of the study population (N = 205,076), 79.9% were dialyzed in for-profit facilities after 6 months of dialysis therapy. Dialysis at for-profit facilities was associated with higher urea reduction ratios, hemoglobin levels (including levels above 12 and 13 g/dL [120 and 130 g/L]), epoetin doses, and use of intravenous iron, and less use of blood transfusions and lower proportions of patients on the transplant waiting-list (P < 0.05). Patients dialyzed at for-profit and at not-for-profit facilities had similar mortality risks (adjusted hazards ratio 1.02, 95% CI 0.99–1.06, P = 0.143).While hemodialysis treatment at for-profit and not-for-profit dialysis facilities is associated with different patterns of clinical benchmark achievement, mortality rates are similar.The incidence rate of treated end-stage renal disease (ESRD) has increased fourfold in the last quarter century [1]. In 2003, the cost to the US Medicare program for a typical dialysis patient was estimated at $67,000 and ESRD accounted for 6.7% of all Medicare expenditures, compared with 4.8% in 1991 [1]. Reimbursement for dialysis services, which has changed little since 1982, is delivered on a per-treatment basis, irrespective of medical, logistical, and infrastructure complexities; cost containment has been a concern since the early days of the Medicare ESRD program [2]. Not surprisingly, for-profit dialysis facilities have become the norm, with freestanding, private, chain-affiliated facilities exhibiting the most prolific growth [1].The concern that treatment at for-profit dialysis facilities may be associated with lower survival rates has been debated for decades [3-12]. Two comparativ
Reduced vagal cardiac control variancein exhausted and high strain job subjects
Sean Collins, Robert Karasek
International Journal of Occupational Medicine and Environmental Health , 2010, DOI: 10.2478/v10001-010-0023-6
Abstract: Objectives: This paper has two primary objectives. First, the paper proposes methodological strategies for analyzing multiscale vagal cardiac control based on the Stress Disequilibrium Theory (SDT) using high frequency power of heart rate variability (HFP) and short term variance of HFP. Second, the paper provides evidence of reduced vagal cardiac control range and variability in high strain job and exhausted subjects. Materials and Methods: Job Strain was measured using the Job Content Questionnaire, 8/day diary reports, and a nationally standardized occupational code linkage in 36 healthy mid-aged males with varying strain jobs. Subjects were Holter-monitored for 48 hours, including a work and rest day. Subjects responded to questions on a daily diary as well as on the Job Content Questionnaire to test for exhaustion as a dichotomous state variable. Vagal cardiac control was measured by components of electrocardiograph: heart rate variability based measures of high frequency power (HFP). We assessed range of vagal cardiac control using extreme value analysis (data in upper tail); and short term vagal variability using Poincaré plots of HFP. Comparisons were made between high (N = 10) and low job strain (N = 22) jobs. Furthermore, subjects categorized as exhausted (N = 4) were separately analyzed. Results: Exhausted subjects displayed a reduced range of vagal cardiac control on the workday; and both high strain and exhausted stubjects displayed reduced short-term variance in vagal cardiac control. A repeated measures ANOVA controlling for age confirms reductions in variance of cardiac vagal activity in high job strain subjects (0.01), with further reductions in subjects reporting exhaustion (p = 0.001). Conclusion: This analysis supports the hypothesis that (a) job strain is associated with reductions in cardiac vagal — or system level — variance; and (b) that reduced system variability may be a characteristic of exhaustion.
The DAVID Gene Functional Classification Tool: a novel biological module-centric algorithm to functionally analyze large gene lists
Da Huang, Brad T Sherman, Qina Tan, Jack R Collins, W Gregory Alvord, Jean Roayaei, Robert Stephens, Michael W Baseler, H Clifford Lane, Richard A Lempicki
Genome Biology , 2007, DOI: 10.1186/gb-2007-8-9-r183
Abstract: Biological interpretation of large gene lists derived from high-throughput genomic or proteomic studies can be a challenging and daunting process. Some of the difficulties include: acquiring large amounts of functional annotation for every gene; the distributed nature of annotation across numerous sources, that is, not centralized; summarizing which genes are associated with specific biological processes and ranking these processes by over-representation analysis; condensing repetitive or redundant annotation data; identifying functional biological modules consisting of related genes and terms; and viewing inter-relationships between groups of genes and groups of biological terms. A number of publicly available bioinformatics tools have addressed the first three points above, including, but not limited to, GoMiner, DAVID, EASE, GOstat, Onto-express, GoToolBox, FatiGO, GOSSIP, GFINDer, GOBar, and so on [1-25]. The power of many of these applications is to systematically highlight the most over-represented biological terms, out of a list of hundreds or thousands of terms, to increase the likelihood of investigators identifying biological processes most pertinent to the biological phenomena under study [17]. While these tools are extremely useful, they are still weak in mining the many-to-many gene-to-term relationships found in functional annotation databases, as well as in condensing redundant contents.Individual genes can clearly be associated with multiple biological terms and, conversely, individual biological terms can be associated with multiple genes. These associations form a complex relationship network of 'many-genes-to-many-terms' that represents the true complex nature of biological processes. Data-mining tools that can extract these complex and redundant relationships should be able to identify functional gene-term biological modules. This identification can be accomplished by using exploratory statistical methods that identify groups of genes sharing sim
The VISTA Science Archive
Nicholas J. G. Cross,Ross S. Collins,Robert G. Mann,Mike A. Read,Eckhard T. W. Sutorius,Robert P. Blake,Mark S. Holliman,Nigel C. Hambly,Jim P. Emerson,Andrew Lawrence,Keith T. Noddle
Physics , 2012, DOI: 10.1051/0004-6361/201219505
Abstract: We describe the VISTA Science Archive (VSA) and its first public release of data from five of the six VISTA Public Surveys. The VSA exists to support the VISTA Surveys through their lifecycle: the VISTA Public Survey consortia can use it during their quality control assessment of survey data products before submission to the ESO Science Archive Facility (ESO SAF); it supports their exploitation of survey data prior to its publication through the ESO SAF; and, subsequently, it provides the wider community with survey science exploitation tools that complement the data product repository functionality of the ESO SAF. This paper has been written in conjunction with the first public release of public survey data through the VSA and is designed to help its users understand the data products available and how the functionality of the VSA supports their varied science goals. We describe the design of the database and outline the database-driven curation processes that take data from nightly pipeline-processed and calibrated FITS files to create science-ready survey datasets. Much of this design, and the codebase implementing it, derives from our earlier WFCAM Science Archive (WSA), so this paper concentrates on the VISTA-specific aspects and on improvements made to the system in the light of experience gained in operating the WSA.
Malay dialect research in Malysia: The issue of perspective
James T. Collins
Bijdragen tot de Taal-, Land- en Volkenkunde , 1989,
Of castles and councillors; Questions about Baileu
James T. Collins
Bijdragen tot de Taal-, Land- en Volkenkunde , 1996,
The identification of an ‘unidentified’ Holle list; The last word (list)
James T. Collins
Bijdragen tot de Taal-, Land- en Volkenkunde , 1991,
A note on cultural vocabulary in the Moluccan Islands
James T. Collins
Bijdragen tot de Taal-, Land- en Volkenkunde , 1983,
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