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排序方式: 共有134条查询结果,搜索用时 31 毫秒
31.
In many distributed computing environments, processes are concurrently executed by nodes in a store- and-forward communication network. Distributed control issues as diverse as name server, mutual exclusion, and replicated data management involve making matches between such processes. We propose a formal problem called “distributed match-making” as the generic paradigm. Algorithms for distributed match-making are developed and the complexity is investigated in terms of messages and in terms of storage needed. Lower bounds on the complexity of distributed match-making are established. Optimal algorithms, or nearly optimal algorithms, are given for particular network topologies. 相似文献
32.
Computerized tomography (CT) followed with magnetic resonance imaging (MRI) several years later enabled first the direct visualization of extravascular blood and products of it's degradation. Protein component of hemoglobin is from over 90% responsible for the hyperdensity of CT image in case of a hemorrhage, whereas paramagnetic properties of hemoglobin derivates are responsible for signal changes in MRI. CT is capable to diagnose accurately just an acute hemorrhage. It changes towards hypodensity in 3 weeks with posthemorrhagic pseudocyst as a final result that has rather low specificity. Differentiation from contusion, ischemic lesion or even astrocytoma may be difficult. CT has thus "short memory" for hemorrhage. MRI can differentiate 5 stages of hemorrhage according to the time schedule: hyperacute, acute, subacute stage I, subacute stage II and chronic. Sequel of a hemorrhage is detectable even years after the hemorrhagic event. The development of intracranial hemorrhage in daily routine MR imaging is described and documented to serve as a guide of model situation for the use of physician. 相似文献
33.
Ivan Miletic François Boudreau Michael Dudzic Greg Kotuza Laura Ronholm Vit Vaculik Yale Zhang 《加拿大化工杂志》2008,86(5):937-946
Experience has shown that data‐driven modelling methods are useful for improving steelmaking processes. In particular, principal components analysis and partial least squares are well‐suited for industrial implementation because they address practical issues such as colinearity and missing data. In the course of applying these multivariate methods on‐line, a need for a flexible computer infrastructure to better support data handling and model implementation was identified and met with an internally developed software calculation platform. Multivariate methods have been found useful for monitoring and for prediction and can also be applied as a foundation for other methods such as optimization. 相似文献
34.
Liehua Ma Logan LebanowskiJin Chen Mengyun GuanRobert Hackenburg Kwong LauShih-Kai Lin Changguo LuKirk McDonald Cullen NewsomZhe Ning Viktor Pě?Sen Qian Vit VorobelYifang Wang Jilei Xu Changgen YangJiawen Zhang Qingmin Zhang 《Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment》2011,659(1):154-160
Resistive plate chambers will be used in the Daya Bay reactor neutrino experiment to help veto backgrounds created by cosmic-ray muons. The mass production of RPCs began in 2008 and by the end of 2009, 1600 RPCs (3500 m2) had been produced and tested. This paper describes the production and quality control procedures, and quality assurance using cosmic-ray testing. 相似文献
35.
36.
Vit Niennattrakul Pongsakorn Ruengronghirunya Chotirat Ann Ratanamahatana 《Data mining and knowledge discovery》2010,21(3):509-541
Among many existing distance measures for time series data, Dynamic Time Warping (DTW) distance has been recognized as one
of the most accurate and suitable distance measures due to its flexibility in sequence alignment. However, DTW distance calculation
is computationally intensive. Especially in very large time series databases, sequential scan through the entire database
is definitely impractical, even with random access that exploits some index structures since high dimensionality of time series
data incurs extremely high I/O cost. More specifically, a sequential structure consumes high CPU but low I/O costs, while
an index structure requires low CPU but high I/O costs. In this work, we therefore propose a novel indexed sequential structure
called TWIST (Time Warping in Indexed Sequential sTructure) which benefits from both sequential access and index structure.
When a query sequence is issued, TWIST calculates lower bounding distances between a group of candidate sequences and the
query sequence, and then identifies the data access order in advance, hence reducing a great number of both sequential and
random accesses. Impressively, our indexed sequential structure achieves significant speedup in a querying process. In addition,
our method shows superiority over existing rival methods in terms of query processing time, number of page accesses, and storage
requirement with no false dismissal guaranteed. 相似文献
37.
38.
Dr. Karl D. Brune Dr. Ilva Liekniņa Dr. Grigorij Sutov Dr. Alexander R. Morris Dr. Dejana Jovicevic Dr. Gints Kalniņš Dr. Andris Kazāks Rihards Kluga Sabine Kastaljana Dr. Anna Zajakina Dr. Juris Jansons Dr. Dace Skrastiņa Dr. Karīna Spunde Alexander A. Cohen Dr. Pamela J. Bjorkman Prof. Dr. Howard R. Morris Prof. Dr. Edgars Suna Prof. Dr. Kaspars Tārs 《Chembiochem : a European journal of chemical biology》2021,22(22):3199-3207
Site-specific protein modifications are vital for biopharmaceutical drug development. Gluconoylation is a non-enzymatic, post-translational modification of N-terminal HisTags. We report high-yield, site-selective in vitro α-aminoacylation of peptides, glycoproteins, antibodies, and virus-like particles (VLPs) with azidogluconolactone at pH 7.5 in 1 h. Conjugates slowly hydrolyse, but diol-masking with borate esters inhibits reversibility. In an example, we multimerise azidogluconoylated SARS-CoV-2 receptor-binding domain (RBD) onto VLPs via click-chemistry, to give a COVID-19 vaccine. Compared to yeast antigen, HEK-derived RBD was immunologically superior, likely due to observed differences in glycosylation. We show the benefits of ordered over randomly oriented multimeric antigen display, by demonstrating single-shot seroconversion and best virus-neutralizing antibodies. Azidogluconoylation is simple, fast and robust chemistry, and should accelerate research and development. 相似文献
39.
An industrial perspective on implementing on-line applications of multivariate statistics 总被引:6,自引:0,他引:6
Ivan Miletic Shannon Quinn Michael Dudzic Vit Vaculik Marc Champagne 《Journal of Process Control》2004,14(8):223-836
Multivariate statistics (MVS) has enjoyed popularity in the applied science literature over the last decade. It has also been well received by industrial practitioners; however, industrial applications have had mixed results. In this paper, we focus on our experiences in developing multivariate statistical systems for industrial use. From these experiences, we identify a methodology for developing useful, long-standing industrial applications. We highlight features we feel are important in the successful development of on-line MVS applications, both technical and non-technical. Specifically, we focus on on-line systems for manufacturing environments. Many of the applications discussed grew out of industry-university collaborations. To end the paper, we recommend topics open for further academic research with an industrial focus. 相似文献
40.