171 research outputs found
Degree Distribution of Arbitrary AANET
Taking the safe distance between two adjacent planes in the same airline into account, we give a model for the multiairline aeronautical ad hoc network (AANET). Based on our model, we analyze the plane’s degree distribution of any arbitrary AANET. Then, the expressions of the degree distributions of one single plane and the whole networks are both worked out and verified by the simulations, in which we generate several random AANETs. Since our model is a reasonable abstraction of the real situation, the theoretical result we get is very close to the result of the real networks, which is also shown in the simulations
Near-Data Prediction Based Speculative Optimization in a Distribution Environment
Hadoop is an open source from Apache with a distributed file system and MapReduce distributed computing framework. The current Apache 2.0 license agreement supports on-demand payment by consumers for cloud platform services, helping users leverage their respective different hardware to provides cloud services. In cloud-based environment, there is a need to balance the resource requirements of workloads, optimize load performance, and the cloud compute costs to manage. When the processing power of clustered machines varies widely, such as when hardware is aging or overloaded, Hadoop offers a speculative execution (SE) optimization strategy, by monitoring task progress in real time, in the starting identical backup tasks on different nodes when multiple tasks under a job are not running at the same speed, providing the first to go. The completed calculations maintain the overall progress of the job. At present, the SE strategy’s incorrect selection of backup nodes and resource constraints may result in poor Hadoop performance, and subsequent tasks cannot be completed execution and other problems. This paper proposes an SE optimization strategy based on near data prediction, which analyzes the prediction of real-time task execution information to predict the required running time, select backup nodes based on actual requirements and approximate data to make the SE strategy achieve the best performance. Experiments prove that in a heterogeneous Hadoop environment, the optimization strategy can effectively improve the effectiveness and accuracy of various tasks and enhance the performance of cloud computing. Platform performance can benefits consumers better than before
Acute effects of different load intensities and rest intervals on muscle strength endurance in male college athletes
The purpose of this study was to compare
the effects of different load intensities with rest intervals between sets on
heart rate, rating of perceived exertion (RPE), power output, and blood lactate
concentration during a squat strength endurance training protocol. A total of 4
sets of strength endurance tests were performed on 15 national Level 2 or above
athletes with different load intensities (30% of 1 repetition maximum (1RM),
50% 1RM) and different rest intervals between sets (1 min, 2 min), 20 reps per
set. Mean power (P-mean), mean heart-rate (HRmean) and RPE variations during the
exercise were collected by using a linear position transducer, heart rate
monitor, and Borg 6–20 scale. Besides, finger blood was collected before and
after the exercise, and analyzed by using a blood lactate
analyzer. HRmean, P-mean and RPE values were significantly
higher at 50% 1RM load intensity than at 30% 1RM (p < 0.01), HRmean
was significantly higher at 1 min rest interval than at 2 min between sets, while
P-mean was significantly higher at 2 min rest interval than at 1 min between sets
(p < 0.05); at 30% 1RM loading intensity, blood lactate
concentrations were significantly higher at the completion of exercise for the 1
min rest interval between sets than for the 2 min (p < 0.01). However,
at 50% 1RM loading intensity, blood lactate increased similarly at the
completion of training in multiple sets, independent of the rest interval between
sets. From a practical point of view, the results suggest that a 1 min
rest interval between sets may be sufficient in a strength endurance training
protocol when the load intensity is 30% 1RM. However, when the load intensity is
50% 1RM, we suggest that a 2 min rest interval between sets is required for
optimal recovery and maintenance of power output
Concept for a Future Super Proton-Proton Collider
Following the discovery of the Higgs boson at LHC, new large colliders are
being studied by the international high-energy community to explore Higgs
physics in detail and new physics beyond the Standard Model. In China, a
two-stage circular collider project CEPC-SPPC is proposed, with the first stage
CEPC (Circular Electron Positron Collier, a so-called Higgs factory) focused on
Higgs physics, and the second stage SPPC (Super Proton-Proton Collider) focused
on new physics beyond the Standard Model. This paper discusses this second
stage.Comment: 34 pages, 8 figures, 5 table
Artemisia pollen allergy in China : Component-resolved diagnosis reveals allergic asthma patients have significant multiple allergen sensitization
Background: Artemisia pollen allergy is a major cause of asthma in Northern China. Possible associations between IgE responses to Artemisia allergen components and clinical phenotypes have not yet been evaluated. This study was to establish sensitization patterns of four Artemisia allergens and possible associations with demographic characteristics and clinical phenotypes in three areas of China.
Methods: Two hundred and forty patients allergic to Artemisia pollen were examined, 178 from Shanxi and 30 from Shandong Provinces in Northern China, and 32 from Yunnan Province in Southwestern China. Allergic asthma, rhinitis, conjunctivitis, and eczema symptoms were diagnosed. All patients sera were tested by ImmunoCAP with mugwort pollen extract and the natural components nArt v 1, nArt ar 2, nArt v 3, and nArt an 7.
Results: The frequency of sensitization and the IgE levels of the four components in Artemisia allergic patients from Southwestern China were significantly lower than in those from the North. Art v 1 and Art an 7 were the most frequently recognized allergens (84% and 87%, respectively), followed by Art v 3 (66%) and Art ar 2 (48%). Patients from Northern China were more likely to have allergic asthma (50%) than patients from Southwestern China (3%), and being sensitized to more than two allergens increased the risk of allergic asthma, in which cosensitization to three major allergens Art v 1, Art v 3, and Art an 7 is prominent.
Conclusions: Componentresolved diagnosis of Chinese Artemisia pollenallergic patients helps assess the potential risk of mugwortassociated allergic asthma.(VLID)329956
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