Subjects: Computer Science >> Computer Application Technology submitted time 2022-11-02 Cooperative journals: 《桂林电子科技大学学报》
Abstract： The data distribution algorithm in Ceph distributed system only takes the capacity as the standard for selecting
storage nodes, and does not consider the network state and node load of storage nodes. In the replica mode, when a storage
node in the three replicas needs to be repaired, too high node load or network load will lead to a large node repair delay. To
solve this problem, a fault-tolerant node selection algorithm based on Ceph (FTNSC) is proposed. Firstly, the software defined
network technology is used to obtain the real-time network state and node load information as the data support of the
node selection method; Then, a multi-attribute decision-making mathematical model considering the node load information is
established to determine the location of the primary storage node; Finally, the artificial bee colony algorithm is used to obtain
the optimal secondary storage node according to the network state and node performance with the primary storage node.
Experimental results show that compared with the existing methods, the proposed method can improve the performance of
data storage nodes and reduce the data repair delay when nodes fail.
Subjects: Computer Science >> Computer Application Technology submitted time 2022-11-02 Cooperative journals: 《桂林电子科技大学学报》
Abstract： Virtual machine placement is a key step in the process of virtual machine consolidation. The quality of the virtual
machine placement method usually affects the resource utilization efficiency and performance of the cloud data center. Such
problems can be solved by establishing a multi-objective optimization model. Currently, cloud data centers have high energy
consumption, low resource utilization, and resource fragmentation. In view of the above situation, a virtual machine placement
strategy based on MALO algorithm is proposed. By establishing a multi-objective and multi-constrained virtual machine
placement model, the energy consumption, resource utilization, and resource fragmentation are optimized. And on the
basis of the Antlion algorithm, by improving the boundary change strategy of the solution space and the location selection
strategy of ants random walk, finally the position of the ants is corrected beyond the boundary, so that the diversity of the
population can be better guaranteed, which can better Jump out of the local optimal solution. Based on the virtual machine
placement platform, the simulation experiments of MALO algorithm and four other virtual machine placement algorithms
are carried out. The experimental results show that compared to the Antlion algorithm, BRC algorithm, MBFD algorithm
and FFD algorithm, the MALO algorithm has a certain improvement effect in reducing energy consumption, improving resource
utilization and reducing resource fragmentation.
Subjects: Biology >> Botany >> Applied botany submitted time 2021-07-20 Cooperative journals: 《广西植物》
Abstract： Liquidambar formosana is an excellent landscape ecological tree species because its leaves turn red gradually after autumn, which is of great ornamental value. In this paper, the changes of tissue structure, photosynthetic characteristics and pigment content of L. formosana leaves were continuously monitored, and the relationship between leaf structure and photosynthetic characteristics and pigment was analyzed in order to understand the relationship between leaf structure changes and leaf color. The results were as follows:（1） During the discoloration process of L. formosana leaves, the epidermal cells were oval and closely arranged, no obvious cell variation was observed, no villi and wax were attached to the surface, and the upper epidermal cells were closely arranged with palisade tissue cells, there was no large air chamber.（2）With the leaf turning red gradually, the leaf structure changed significantly. The thickness of leaf, upper epidermis, palisade tissue and spongy tissue and stomatal aperture decreased gradually, whereas the length and width of stomatal apparatus and the area of single stomatal apparatus gradually increased. （3）With the change of leaf structure, the chlorophyll content decreased gradually, resulting in the decrease of net photosynthetic rate. When light damage occurred, leaves protected themselves by synthesizing anthocyanins in the vacuoles of palisade tissue cells, then a large amount of anthocyanins caused the leaf surface to show red. Therefore, the decrease of chlorophyll content and the accumulation of anthocyanins are the direct reasons for the redness of L. formosana leaves. To sum up, the red color of L. formosana leaves is the combination result of a series of physiological structure characteristics.
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