Streaming algorithm for balance gain and cost with cardinality constraint on the integer lattice

Team formation problem is a very important problem in the labor market, and it is proved to be NP-hard. In this paper, we design an efficient bicriteria streaming algorithms to construct a balance between gain and cost in a team formation problem with cardinality constraint on the integer lattice. To solve this problem, we establish a model for maximizing the difference between a nonnegative normalized monotone submodule function and a nonnegative linear function. Further, we discuss the case where the first function of the object function is $\alpha$--weakly submodular. Combining the lattice binary search with the threshold method, we present an online algorithm called bicriteria streaming algorithms. Meanwhile, we give detailed analysis for both of these models

ABS: Adaptive Bounded Staleness Converges Faster and Communicates Less

Wall-clock convergence time and communication rounds are critical performance metrics in distributed learning with parameter-server setting. While synchronous methods converge fast but are not robust to stragglers; and asynchronous ones can reduce the wall-clock time per round but suffers from degraded convergence rate due to the staleness of gradients, it is natural to combine the two methods to achieve a balance. In this work, we develop a novel asynchronous strategy that leverages the advantages of both synchronous methods and asynchronous ones, named adaptive bounded staleness (ABS). The key enablers of ABS are two-fold. First, the number of workers that the PS waits for per round for gradient aggregation is adaptively selected to strike a straggling-staleness balance. Second, the workers with relatively high staleness are required to start a new round of computation to alleviate the negative effect of staleness. Simulation results are provided to demonstrate the superiority of ABS over state-of-the-art schemes in terms of wall-clock time and communication rounds

A KINEMATIC ANALYSIS OF ROUND KICK IN TAEKWONDO

The purpose of this study is to provide kinematic analysis of the round kick in Taekwondo. The round kick is an important component required in the performance of Taekwondo. In order to accomplish this skill, it is necessary to accelerate the movement of the leg to a high velocity. In order to determine the mechanism involved in this maneuver, kinematic analysis of the motion will be used. This study analyzed the round kick motion through application of the 3D-video analysis system. The data determined that the muscles of the thigh initiate the round kick, transmitting force from the hip, through to the shank and finally to the foot. Before kicking the target, the knee-joint flexes to increase the velocity of leg and then the lower limbs extend. These are the requirements for a rapid and powerful kick

Neuroprotective effects of arbutin against oxygen and glucose deprivation-induced oxidative stress and neuroinflammation in rat cortical neurons

In this study, the neuroprotective potential of arbutin (100 µmol L–1) pre-treatment and post-treatment against oxygen/glucose deprivation (OGD) and reoxygenation (R) induced ischemic injury in cultured rat cortical neurons was explored. The OGD (60 min) and reoxygenation (24 h) treatment significantly (p < 0.001) compromised the antioxidant defence in cultured neurons. Subsequently, an increase (p < 0.001) in lipid peroxidation and inflammatory cytokines (tumour necrosis factor-α and nuclear factor kappa-B) declined neuron survival. In pre- and post-condition experiments, treatment with arbutin enhanced both survival (p < 0.01) and integrity (p < 0.05) of cultured neurons. Results showed that arbutin protects (p < 0.05) against peroxidative changes, inflammation, and enhanced the antioxidant activity (e.g., glutathione, superoxide dismutase and catalase) in cultured neurons subjected to OGD/R. It can be inferred that arbutin could protect against ischemic injuries and stroke. The anti-ischemic activity of arbutin can arrest post-stroke damage to the brain

Swept blade influence on aerodynamic performance of steam turbine nozzle cascades

To improve the aerodynamic performance of steam turbine nozzle cascades, it is significant to study the effect of swept blades to control the flow field within the cascade. Numerical simulations of three different sweep angle blades (−20°, +20° and 0°) were carried out, using CFD modelling. Simulation results showed that the aft-swept blade can effectively improve the corresponding flow characteristics and reduce the total pressure loss. Meanwhile, it has better aerodynamic performance than the straight blade and the fore-swept blade

PO-208 Effect of resistance training on functional fitness and bone mineral density in elderly women

Objective Try to carry out the intervention experiment of the strength exercise of the elderly in the community, aiming to provide theoretical and data basis for the daily strength exercises of the elderly in China. Methods &nbsp;Recruiting 18 elderly female volunteers in Xicheng District, Beijing, required independent living ability and were willing to participate in the experiment. They were randomly divided into intervention group (N=9, 62.0±6.0 years) and control group (N=9, 63.0 ± 4.8 years). On Tuesday afternoon and Thursday morning, under the leadership of a professional coach, follow the planned "Resistance Exercise Plan" to carry out resistance training. Each practice time is about 90min for 9 weeks. The exercise intensity control is divided into two phases: the first phase lasts for one week, mainly the learning and adaptation phase of the action, and the heart rate control in the 30%~40%HRR or RPE 10 subscale is 4 (a little easy); The stage lasts for 8 weeks of the medium-intensity practice phase, the heart rate control in the 40%~60%HRR or RPE 10 subscale is 5~6 (moderate, slightly strenuous). Results Intervention group before and after experiment, the grip strength (25.0±5.0 VS 26.8±3.9 kg, P&lt;0.05) and the 30s arm curl test (23.1±5.2 VS 25.4±4.0 reptitions, P&lt;0.05) increased. Five sit-up tests (6.99±2.01 VS 6.51±2.00 s, P&lt;0.05) and the 8-foot standing walk (5.13±1.03 VS 5.07±1.01 s, P&lt;0.05) were all shortened. The bone density T value (-1.3±0.4 VS -1.0±0.4, P&lt;0.05) increased. After intervention, the intervention group compared with the control group, grip strength (26.8 ± 3.9 VS 22.1 ± 4.5 kg, P &lt;0.05), 30s arm curl test(25.4 ± 4.0 VS 22.1 ± 3.0 reptitions, P &lt;0.05) increased. Five sit-up tests (6.51 ± 2.00 VS 6.94 ± 1.05 s, P &lt; 0.05) and 8 feet of standing walk (5.07 ± 1.01 VS 5.27 ± 0.97 s, P &lt; 0.05) were all shortened. Bone density T value (-1.0 ± 0.4 VS - 1.4 ± 0.4, P &lt; 0.05) increased. There was no significant change in the 30-second chair stand test. Conclusions Through 9 weeks of progressive resistance exercise, the experiment made the upper limb explosive force, upper limb muscle endurance, lower limb explosive power, flexibility and dynamic balance enhanced, and bone density increased. The enhancement of lower limb endurance is not obvious, which may be the reason for short experimental time and small exercise intensity of lower limbs