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Dynamic Caching Routing Strategy for LEO Satellite Nodes Based on Gradient Boosting Regression Tree
( Yang Yang ),( Shengbo Hu ),( Guiju Lu ) 한국정보처리학회 2024 Journal of information processing systems Vol.20 No.1
A routing strategy based on traffic prediction and dynamic cache allocation for satellite nodes is proposed to address the issues of high propagation delay and overall delay of inter-satellite and satellite-to-ground links in low Earth orbit (LEO) satellite systems. The spatial and temporal correlations of satellite network traffic were analyzed, and the relevant traffic through the target satellite was extracted as raw input for traffic prediction. An improved gradient boosting regression tree algorithm was used for traffic prediction. Based on the traffic prediction results, a dynamic cache allocation routing strategy is proposed. The satellite nodes periodically monitor the traffic load on inter-satellite links (ISLs) and dynamically allocate cache resources for each ISL with neighboring nodes. Simulation results demonstrate that the proposed routing strategy effectively reduces packet loss rate and average end-to-end delay and improves the distribution of services across the entire network.
Study on cultural feature of Chinese Furniture - center on chair
Yang yang 한국콘텐츠학회 2009 ICCC International Digital Design Invitation Exhib Vol.2009 No.12
As a part of material culture and spiritual culture, furniture is a result of development which is caused by politics and economics, culture in our society, and it is also a materialized view of culture and art rich deposits. It is an expression of traditional culture and art style of countries and nations during a special history period. Five thousand years of Chinese civilization, forms Chinese furniture culture which cohere Chinese nation spirits and embody the nation feature. Furniture firstly meets the functional needs such as to sit, lie on, support, store etc, then it becomes a symbol of traditional feature and nationality, and also becomes a culture type, culture carrier and culture phenomenon. Described the cultural affections to the furniture, the article will specify the importance of culture during the development of Chinese furniture.
Purification and Structure Analysis of Mycolic Acids in Corynebacterium glutamicum
Yang Yang,Feng Shi,Guanjun Tao,Xiaoyuan Wang 한국미생물학회 2012 The journal of microbiology Vol.50 No.2
Corynebacterium glutamicum is widely used for producing amino acids. Mycolic acids, the major components in the cell wall of C. glutamicum might be closely related to the secretion of amino acids. In this study, mycolic acids were extracted from 5 strains of C. glutamicum, including ATCC 13032,ATCC 13869, ATCC 14067, L-isoleucine producing strain IWJ-1, and L-valine producing strain VWJ-1. Structures of these mycolic acids were analyzed using thin layer chromatography and electrospray ionization mass spectrometry. More than twenty molecular species of mycolic acid were observed in all 5 strains. They differ in the length (20–40carbons) and saturation (0–3 double bonds) of their constituent fatty acids. The dominant species of mycolic acid in every strain was different, but their two hydrocarbon chains were similar in length (14–18 carbons), and the meromycolate chain usually contained double bonds. As the growth temperature of cells increased from 30°C to 34°C, the proportion of mycolic acid species containing unsaturated and shorter hydrocarbon chains increased. These results provide new information on mycolic acids in C. glutamicum,and could be useful for modifying the cell wall to increase the production of amino acids.
Yang Yang,Yuan Wang,Qianfeng Liao,Jiongliang Pan,Junyu Meng,Hao Huang 한국정밀공학회 2022 International Journal of Precision Engineering and Vol.9 No.4
In the corner milling process, processing energy consumption is a very important objective, since the energy efficiency of CNC machine is barely above 14.8%. Meanwhile, the excessive processing temperature will increase the thermal deformation of the product and leads to quality decline. Improper process parameters will lead to unnecessary high temperature and energy consumption. By optimizing the process parameters, the appropriate temperature and Specific Energy Consumption can be obtained. This study investigated into modeling Specific Energy Consumption and temperature in corner milling process using variable-fidelity metamodels. The adopted variable-fidelity metamodels are constructed by Hierarchical Kriging, in which 48 sets of low-fidelity data obtained from the AdvantEdge software simulation are used to reflect the trends of the metamodels, and 16 sets of high-precision data obtained from physical experiments are used to calibrate the trends. The experimental cost is reduced and the prediction accuracy is increased by making full use of both sets of data. An improved K-means Multi-objective Particle Swarm Optimization algorithm was adopted and applied on the multi-objective corner milling parameters optimization problem to find satisfactory specific energy consumption and temperature. The obtained Pareto solutions can provide guidance for selecting process parameters according to different requirements, such as reducing energy consumption or temperature.
Yang Yang,Yuefei Wu,Fengbo Yang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.6
In this paper, an error-driven adaptive feedback control with an extended state observer (ANCESO) has been developed for the three-axis electrical-optical gyro-stabilized platform. The proposed controller takes into account not only the system parametric deviations as well as external disturbances via integrating adaptive nonlinear feedback tracking control and the extended state observer design. An improved error-driven nonlinear functions are constructed with feedback gain self-regulates to avoid the high gain chattering of the closed loop system. By integrating the fundamentally different working mechanisms of the approaches, the developed ANCESO strategy is able to preserve the theoretical performance results of both design approaches while overcoming their practical performance limitations. Comparative experimental results are obtained to validate the benefits and effectiveness of the proposed control strategy.
Yang Yang,Xinyu Chen,Liping Ran,Yunfei Wu,Xurun Yu,Zhaodi Dong,Fei Xiong 한국식물학회 2019 Journal of Plant Biology Vol.62 No.4
The development of protein bodies (PBs) determinesthe processing properties of wheat (Triticum aestivum L.). Ithas been known that nitrogen uptake has a strong impact ongrain protein concentration. However, the differences of theformation of PB in different developmental stages anddifferent positions in wheat endosperm are still controversial. To solve these issues, PBs formation in different wheatendosperm parts and the response to nitrogen were investigatedusing light, transmission electron microscopes in presentstudy. The main results were as follows. (1) Proteins mainlyformed PBs via the Golgi apparatus in the vacuole at theearly stage of wheat endosperm development. After 7 dayspost anthesis, most proteins were derived from the roughendoplasmic reticulum. (2) The morphology of PBs was diverseamong different endosperm parts. Compared with the centralendosperm, the PBs in sub-aleurone cells were abundant andlarge. (3) More abundant endoplasmic reticulum, Golgi andmitochondrion were observed at the early stage after nitrogentreatment. Nitrogen also increased the accumulation of PBsat the later stage. (4) The sub-aleurone region cells of theendosperm presented more significant responses to nitrogenthan the central endosperm.
Yang Yang,Yuwei Zhang,Zijin Wang,Xuefeng Si,Jinran Wu 제어·로봇·시스템학회 2023 International Journal of Control, Automation, and Vol.21 No.2
Fault-tolerant control (FTC) of a non-affine system with uncertainties is one of critical issues in nonlinear control. In this paper, in the presence of unknown actuator failures, an event-trigger-based FTC scheme is proposed for such a nonlinear system with predefined performance. For actuator failures, a compensation mechanism is designed to alleviate their impacts. By utilizing a predefined performance function, higher tracking accuracy can be obtained. Meanwhile, an event-triggered mechanism with a time-varying threshold, depending on tracking error, reduces the number of communications for a controller-to-actuator channel. An adaptive event-triggered function is then proposed with the compensation mechanism to improve the self-adjusting ability of the triggered function. Also, extended state observers and tracking differentiators are utilized to reconstruct unknown dynamics of the system and to simplify high-order derivation of virtual control laws, respectively. The stability of the closed-loop system is analyzed by input-to-state practically stability. Finally, two simulation results are supplied to verify the effectiveness of the proposed control method.
Porous membranes in pressure-assisted forward osmosis: Flux behavior and potential applications
Yang Yang,Xueli Gao,Zhaokui Li,Qun Wang,Senjie Dong,Xiaojuan Wang,Zhun Ma,Leyi Wang,Xinyan Wang,Congjie Gao 한국공업화학회 2018 Journal of Industrial and Engineering Chemistry Vol.60 No.-
In this work, pressured-assisted forward osmosis (PAFO) was performed using porous membranes to achieve higher fluxes. The effects of additional pressure and membrane orientation on membrane performance were investigated. When ultralow additional pressure (0.04 bar) was applied, the water flux at AL-FS orientation (i.e. active layer facing the feed solution) was observed to double. Reverse solute diffusion was also inhibited dramatically at both membrane orientations in PAFO. Filtration tests revealed that porous membranes with ultralow pressure in FO were more applicable than ultrafiltration (UF) because mild condition (i.e., 0.12 bar versus 1.25 bar) is conducive to preserving microalgae cell integrity.
Yang Yang,Hao Fan,Peng-cheng Ma 한국정밀공학회 2017 International Journal of Precision Engineering and Vol.18 No.8
A new longwall shearer cutting transmission system with variable cutting speed (LSCT-V) is presented to overcome the weaknesses of the traditional longwall shearer cutting transmission system (LSCT) with constant cutting speed. The dynamic model of the LSCTV and LSCT, which includes a cutting-motor rotator and drum, are established in AMESim, and the dynamic response of each system is analyzed using AMESim. Simulation results show that the function of frequency control for the designed LSCT-V system can be achieved, compared with the dynamic behavior of LSCT system under step torque load. The dynamic characteristics of the LSCT-V system are very close when working in constant or varying cutting speeds.