On the premise of safety, economy is one of the important objectives of nuclear power plants. For VVER-1000, there are several cases of operation modes when the plant is off the grid, such as the critical operation af...
详细信息
On the premise of safety, economy is one of the important objectives of nuclear power plants. For VVER-1000, there are several cases of operation modes when the plant is off the grid, such as the critical operation after refueling, the hot shutdown and critical operation, and the critical operation after test. For the purpose to reduce the time of the operations, the consumption of materials, and the amount of waste water produced, the optimization researches are carried out on these cases. The qualitative and quantitative analysis is carried out, on the configurations of the control rod and boric acid, which are the important factors to influence the shutdown and critical operations. The general steps and the basic principles of the optimizations are described. Three cases are optimized.
Cooperative guidance for multiple flight vehicles against single moving target is studied in this paper. Two finite-time consensus protocols are developed for multi-agent system with input saturation which underlay th...
详细信息
ISBN:
(纸本)9781479925391
Cooperative guidance for multiple flight vehicles against single moving target is studied in this paper. Two finite-time consensus protocols are developed for multi-agent system with input saturation which underlay the design of cooperative guidance law. The cooperative guidance approaches are investigated to solve the many-to-one interception problem, where two novel guidance laws considering the actuator saturation are proposed to guarantee multiple flight vehicles can intercept the target simultaneously. Simulations for a three-to-one scenario are presented to demonstrate the effectiveness of the proposed design approaches.
The paper presents an innovative design for a wheeled hopping robot. Our main objective was to obtain a stable and efficient robot, which can jump over obstacles and has the ability to reach a certain ledge. The innov...
详细信息
The paper presents an innovative design for a wheeled hopping robot. Our main objective was to obtain a stable and efficient robot, which can jump over obstacles and has the ability to reach a certain ledge. The innovative design of our robot has the capability to jump to a certain distance even with a zero initial velocity provided by the wheels movement. Also, we took into consideration the wind speed which can prevent our robot to reach the desired destination, and compensated with an initial velocity on the direction of movement. For testing we designed a simulation which had as inputs different initial conditions to test and present the jumping capability of our robot in different jumping conditions. In the end we provide a jump area which the robot can reach for certain initial conditions, so we can later chose the optimal one for reaching the target position.
The forward modeling of wave propagation is a widely-used computational method in oil and gas exploration. Its iterative stencil loops also have broad applications in scientific computing. However, the time-consuming ...
详细信息
Support Vector Machine (SVM) has been widely used in data-mining and Big Data applications as modern commercial databases start to attach an increasing importance to the analytic capabilities. In recent years, SVM was...
详细信息
ISBN:
(纸本)9781479938018
Support Vector Machine (SVM) has been widely used in data-mining and Big Data applications as modern commercial databases start to attach an increasing importance to the analytic capabilities. In recent years, SVM was adapted to the field of High Performance Computing for power/performance prediction, auto-tuning, and runtime scheduling. However, even at the risk of losing prediction accuracy due to insufficient runtime information, researchers can only afford to apply offline model training to avoid significant runtime training overhead. Advanced multi- and many-core architectures offer massive parallelism with complex memory hierarchies which can make runtime training possible, but form a barrier to efficient parallel SVM design. To address the challenges above, we designed and implemented MIC-SVM, a highly efficient parallel SVM for x86 based multi-core and many-core architectures, such as the Intel Ivy Bridge CPUs and Intel Xeon Phi co-processor (MIC). We propose various novel analysis methods and optimization techniques to fully utilize the multilevel parallelism provided by these architectures and serve as general optimization methods for other machine learning tools. MIC-SVM achieves 4.4-84x and 18-47x speedups against the popular LIBSVM, on MIC and Ivy Bridge CPUs respectively, for several real-world data-mining datasets. Even compared with GPUSVM, run on a top of the line NVIDIA k20x GPU, the performance of our MIC-SVM is competitive. We also conduct a cross-platform performance comparison analysis, focusing on Ivy Bridge CPUs, MIC and GPUs, and provide insights on how to select the most suitable advanced architectures for specific algorithms and input data patterns.
As the important parts of the fuel assemblies of Pressurized Water reactors (PWR), the presence of spacer grids promotes the local heat transfer adjacent to the wall downstream the grids by causing cross and swirl flo...
详细信息
ISBN:
(纸本)9781629937212
As the important parts of the fuel assemblies of Pressurized Water reactors (PWR), the presence of spacer grids promotes the local heat transfer adjacent to the wall downstream the grids by causing cross and swirl flow between and within sub-channels, which greatly widen the thermal hydraulic safety margin. Recent years, with tremendous development of computer technologies and numerical simulations, Computational Fluid Dynamics codes (CFD) are widely adapted to the designs and selections of spacer grid. This paper presents a CFD methodology to evaluate two-phase mixing characteristics on PWR fuel rod bundle with spacer grids. Numerical simulations on air and water flow were carried out with CFX 12.0 for two different patterns of spacer grids. In addition, they were selected for the critical heat flux (CHF) tests with FREON in Nuclear Power Institute of China (NPIC). Comparisons of numerical researches and experimental results show that the CFD methodology to predict bubble congregating tendency adjacent to the surface of fuel rod was validated.
暂无评论