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- 저자 : Jiulong Wang (검색결과 3 건)
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Shear Strength Behavior of Coarse-Grained Saline Soils after Freeze-Thaw
Songhe Wang,Jiulong Ding,Jian Xu,Jianwei Ren,Yugui Yang 대한토목학회 2019 KSCE JOURNAL OF CIVIL ENGINEERING Vol.23 No.6
The bearing capacity of embankment filled by coarse-grained saline soils will be deteriorated after freeze-thaw, especially when shallow groundwater is included. Direct shear tests were carried out on coarse saline specimens that experienced freeze-thaw cycling. The shear strength of soil specimens at three densities strongly depends upon the normal stress when freeze-thaw is not involved, manifesting as a linear increase. Strength indexes such as cohesion and internal friction angle grow at higher dry densities while little change noted in the residual. The cohesion increases with salt content but lowers with freeze-thaw, especially in initial five cycles, beyond which it stabilizes. The internal friction angle is not associated with the above two factors. The stress-strain curves after freeze-thaw are all strain softening, especially at higher densities. The shear stress exhibits larger influence on particle crushing than freeze-thaw. The modified relative breakage index was calculated based on particle grading curves, and is negatively correlated with the cohesion. An empirical equation was proposed by fitting test data incorporating both salt content and freeze-thaw cycles. Comparisons prove that the calculated cohesion agrees well with the measured data.
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Switched‑capacitor‑based high‑gain DC–DC converter for fuel cell vehicle powertrain
Xiaogang Wu,Jiulong Wang,Yun Zhang,Zhengxin Liu 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.4
A novel DC–DC converter with switched capacitor is proposed to satisfy the requirements of fuel cell vehicles for DC–DC converter in terms of step-up ratio, efficiency, and voltage stress. The proposed converter has the advantages of high step-up ratio, low voltage stress of each device, the common ground, high efficiency, and small size. It is compared with other converters in the above aspects. The dynamic model of the proposed converter can be obtained on the basis of the small-signal modeling method and the state space average method. Experimental results show that the proposed converter has a high step-up ratio under a nonextreme duty cycle state, and the highest efficiency is 94.25%. Compared with the dual-switch boost converter, the proposed converter has certain advantages in terms of step-up ratio, component voltage stress, and efficiency. Consequently, it is more suitable for the powertrain of fuel cell vehicles.
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Optimization Scheme for Small Files Storage Based on Hadoop Distributed File System
Yingchi Mao,Bicong Jia,Wei Min,Jiulong Wang 보안공학연구지원센터 2015 International Journal of Database Theory and Appli Vol.8 No.5
Hadoop Distributed File System (HDFS) becomes a representative cloud platform, benefiting from its reliable, scalable and low-cost storage capability. However, HDFS does not present good storage and access performance when processing a huge number of small files, because massive small files bring heavy burden on NameNode of HDFS. Meanwhile, HDFS does not provide any optimization solution for storing and accessing small files, as well as no prefetching mechanism to reduce I/O operations. This paper proposes an optimized scheme, Structured Index File Merging-SIFM, using two level file indexes, the structured metadata storage, and prefetching and caching strategy, to reduce the I/O operations and improve the access efficiency. Extensive experiments demonstrate that the proposed SIFM can effectively achieve better performance in the terms of the storing and accessing for a large number of small files on HDFS, compared with native HDFS and HAR.
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