A novel heuristic for handover priority in mobile heterogeneous networks based on a multimodule Takagi–Sugeno–Kang fuzzy system

Fuqi Zhang1,Pingping Xiao,Yujia Liu 한국전자통신연구원 2022 ETRI Journal Vol.44 No.4

H2RDC (heuristic handover based on RCC-DTSK-C), a heuristic algorithm based on a highly interpretable deep Takagi–Sugeno–Kang fuzzy classifier, is proposed for suppressing the mobile heterogeneous networks problem of frequent handover and handover ping-pong in the multibase-station scenario. This classifier uses a stack structure between subsystems to form a deep classifier before generating a base station (BS) priority sequence during the handover process, and adaptive handover hysteresis is calculated. Simulation results show that H2RDC allows user equipment to switch to the best antenna at the optimal time. In high-BS density load and mobility scenarios, the proposed algorithm’s handover success rate is similar to those of classic algorithms such as best connection (BC), self tuning handover algorithm (STHA), and heuristic for handover based on AHP-TOPSIS-FUZZY (H2ATF). Moreover, the handover rate is 83% lower under H2RDC than under BC, whereas the handover ping-pong rate is 76% lower.

Exploring Appropriate Moral Education Methods in Literary Education in We-media Age

Yujia ZHANG(Yujia ZHANG),Huan YU(Huan YU) 한국공공가치학회 2023 공공가치연구 Vol.5 No.-

Purpose: Exploring appropriate moral education methods that adapt to the We-media age is an important task of literary education. In the context of We-media, literary education should aim at guiding the students to think over moral issues in specific situations on the basis of the aesthetic role of literature in order to promote their moral development. We-media have made communication convenient and efficient, and have created more diversified communication forms. Conclusion: Therefore, teachers should fully utilize the unique advantages of We-media in literary education to strengthen the communication and exchange between teachers and students and among the students themselves in the face of specific moral issues, and to cultivate the students’ ability to appropriately grasp moral phenomena and apply moral rules.

Directional production of even carbon volatile fatty acids from peanut meal: effects of initial pH and hydraulic residence time

Yujia Chen,Qian Fang,Lu Zhang,Kequan Zhang,Tong Wei,Qiqi Ping 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.4

In this study, peanut meal was used as the substrate for the continuous production of even carbon volatile fatty acids (ECFA) through anaerobic fermentation. First, a continuous stirred reactor (CSTR) was started by adjusting the initial pH to acclimate the related bacteria, and then the hydraulic residence time (HRT) was optimized. The effects of different initial pH and HRT on the potential of ECFA production by peanut meal fermentation, the transformation and utilization of main organic compounds, and the composition and replacement of microbial community structure behind it were investigated. The results showed that ECFA was the dominant factor in the acid production of peanut meal fermentation, and alkaline pH and HRT = 6 d were the more favorable operating conditions for the hydrolysis and acidification of peanut meal. The average concentration of total volatile fatty acids (TVFAs) obtained was 15,249.50 mg/L, and the content of ECFA varied from 88.51% to 96.27%, with an average ratio of 92.55%. This operation condition drove the formation of microbial community structure, mainly including Prepotella, Tepididimicrobium, Anaerosalibacter, and Igatzschineria, which were favorable for ECFA production, reflecting the potential of using peanut meal for targeted production of ECFA.

Design, analysis, and test of a decoupled flexure-based 5-DOF micro-positioning platform

Jian Zhang,Yujia Zhang,Minglun Dong 대한기계학회 2022 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.36 No.8

This paper presents the mechanical design, simulation analysis and experimentation of a decoupled 5-degree-of-freedom (5-DOF) micro-positioning platform, which is composed of a 2-DOF micro-displacement platform, a 1-DOF micro-displacement platform and a 2-DOF micro-rotation platform in series. Double four-bar parallelogram structure and a new 2-DOF rotary guiding mechanism based on flexure hinges are applied to realize motion decoupling, and the displacement of the piezoelectric actuator is amplified with a bridge mechanism. The static models of the micro-displacement platform and micro-rotation platform are established by the compliance matrix method. Then the dynamic models of the two sub-platforms are established to obtain their natural frequencies. The performance of the 5-DOF platform is evaluated through finite element analysis and experiment test. It turns out that the theoretical model and simulation model established in this paper have high accuracy, the platform also performs well in motion decoupling, motion stroke and natural frequency.

Protein molecular structure, degradation and availability of canola, rapeseed and soybean meals in dairy cattle diets

Yujia Tian,Xuewei Zhang,Rongcai Huang,PeiqiangYu 아세아·태평양축산학회 2019 Animal Bioscience Vol.32 No.9

Objective: The aims of this study were to reveal the magnitude of the differences in protein structures at a cellular level as well as protein utilization and availability among soybean meal (SBM), canola meal (CM), and rapeseed meal (RSM) as feedstocks in China. Methods: Experiments were designed to compare the three different types of feedstocks in terms of: i) protein chemical profiles; ii) protein fractions partitioned according to Cornell Net Carbohydrate and Protein System; iii) protein molecular structures and protein second structures; iv) special protein compounds-amino acid (AA); v) total digestible protein and energy values; vi) in situ rumen protein degradability and intestinal digestibility. The protein second structures were measured using FT/IR molecular spectroscopy technique. A summary chemical approach in National Research Council (NRC) model was applied to analyze truly digestible protein. Results: The results showed significant differences in both protein nutritional profiles and protein structure parameters in terms of α-helix, β-sheet spectral intensity and their ratio, and amide I, amide II spectral intensity and their ratio among SBM, CM, and RSM. SBM had higher crude protein (CP) and AA content than CM and RSM. For dry matter (DM), SBM, and CM had a higher DM content compared with RSM (p<0.05), whereas no statistical significance was found between SBM and CM (p = 0.28). Effective degradability of CP and DM did not demonstrate significant differences among the three groups (p>0.05). Intestinal digestibility of rumen undegradable protein measured by three-step in vitro method showed that there was significant difference (p = 0.05) among SBM, CM, and RSM, which SBM was the highest and RSM was the lowest with CM in between. NRC modeling results showed that digestible CP content in SBM was significantly higher than that of CM and RSM (p<0.05). Conclusion: This study suggested that SBM and CM contained similar protein value and availability for dairy cattle, while RSM had the lowest protein quality and utilization.

Overview of Active Disturbance Rejection Control for Permanent Magnet Synchronous Motors

Zhang Xinhua,Chen Yujia,Sun Xiaodong 대한전기학회 2024 Journal of Electrical Engineering & Technology Vol.19 No.3

The ubiquitous implementation of permanent magnet synchronous motors (PMSMs) in contemporary alternating current propulsion systems is widely acknowledged. As a superior control method that does not rely on a precise system mathematical model and has superior robustness, Active Disturbance Rejection Control (ADRC) is widely used to improve the overall control performance and efciency of the PMSM drive system. Starting from three parts of ADRC, this paper comprehensively expounds on the advantages of the ADRC control strategy and its shortcomings in the application at present. The problems of too many parameters, not easily controlling the nonlinear part, and difculty in adjusting the parameters are summarized. Then the performance improvement schemes of ADRC such as structure optimization, parameter tuning, nonlinear part optimization, and simplifed parameters are summarized. Finally, the future development trend of the control algorithm is forecasted.

Overexpression of miR-155-5p Inhibits the Proliferation and Migration of IL-13-Induced Human Bronchial Smooth Muscle Cells by Suppressing TGF-β-Activated Kinase 1/MAP3K7-Binding Protein 2

Yujia Shi,Xingli Fu,Qi Cao,Zhengdao Mao,Yi Chen,Yun Sun,Zhiguang Liu,Qian Zhang 대한천식알레르기학회 2018 Allergy, Asthma & Immunology Research Vol.10 No.3

Purpose: Molecular mechanisms leading to asthma is still ill-defined. Though the function of microRNAs (miRNAs) in asthma was previously reported, the involvement of miR-155 in important features of this disease remains unknown. The present study was designed to uncover the probable involvement of miR-155-5p in the proliferation and migration of IL-13-induced human bronchial smooth muscle cells (BSMCs) and the intrinsic regulatory mechanism. Methods: The effects of different concentrations of IL-13 on the proliferation and migration of BSMCs as well as the expression of miR-155-5p and its predicted target transforming growth factor (TGF)-β-activated kinase 1/MAP3K7-binding protein 2 (TAB2) were investigated. The effects of miR-155-5p on the proliferation and migration of interleukin (IL)-13-induced BSMCs was determined in vitro using BSMCs transfected with miR-155 mimic/inhibitor and induced by a high concentration of IL-13. The quantitative real-time polymerase chain reaction (qRT-PCR) was employed for determining the expression of miR-155-5p and TAB2. Western blotting was applied to analyze the expression of TAB2 at the protein level. Cell proliferation and migration were assessed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and Transwell assays, respectively. Results: The proliferation and migration of BSMCs were dose-dependently increased with IL-13 treatment. Contrariwise, IL-13 dose-dependently inhibited the expression of miR-155-5p in BSMCs. Mechanistic studies showed that inhibition of miR-155-5p further promoted the stimulatory effects of IL-13, whereas overexpression of miR-155 significantly inhibited these effects. In silico studies and luciferase reporter assays indicated that TAB2 was a negatively regulated miR-155-5p target. Conclusions: These results suggested that miR-155-5p-inhibit the IL-13-induced proliferation and migration of BSMCs by targeting TAB2 and that the IL-13/miR-155/TAB2 pathway could serve as a therapeutic target for pulmonary diseases, especially asthma.

The synthesis of polyhydroxyalkanoates from low carbon wastewater under anaerobic-microaerobic process: effects of pH and nitrogen and phosphorus limitation

Kequan Zhang,Qian Fang,Yihan Xie,Yujia Chen,Tong Wei,Yanyu Xiao 대한환경공학회 2022 Environmental Engineering Research Vol.27 No.6

Polyhydroxyalkanoate (PHA) is a new type of bio-polyester which is expected to replace traditional petroleum-based plastics. The experiment was carried out based on anaerobic-microaerobic process. Firstly, the PHA accumulation capacity of activated sludge under different pH conditions was discussed, and then the batch test of nitrogen and phosphorus limitation was carried out under the condition of optimal pH. Moreover, the content of PHA monomer under nutrient restriction was also studied. The experimental results showed that when pH was not controlled (7.5~8.5), C:N and C:P weight ratio was equal to 150, the maximum content of PHA accounted for 50.39% and 36.07% of the dry cell weight, respectively. Besides, it was found that increasing the C:N weight ratio was beneficial to increasing the proportion of polyhydroxyvalerate (PHV) monomer in PHA.

An empirical investigation of the relationship between Six Sigma practices and organizational innovation: evidence from China

( Zhen He ),( Yujia Deng ),( Min Zhang ),( Xingxing Zu ),( Jiju Antony ) 한국품질경영학회 2015 한국품질경영학회 학술대회 Vol.2015 No.2

Purpose -The purpose of this paper is to explore the relationships between Six Sigma practices and different types of organizational innovation including product innovation, process innovation and administrative innovation. Design/methodology/approach - Empirical data were collected from 249 firms in China which had implemented Six Sigma as a formal program in their organization. Structural Equation Modeling was used to test the hypothesized relationship between Six Sigma practices and innovation. Finding -The results show that Six Sigma management, infrastructure, and core practices have a positive relationship with product, process and administrative innovation. Originality/value -This study contributes to a better understanding of how firms can take advantage of the Six Sigma implementation to improve their capacity in innovation.

Research on the characteristics of CO2 heat pump integrated with thermal energy storage for space heating

Zhihua Wang,Yujia Zhang,Fenghao Wang,Guichen Li 대한기계학회 2021 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.35 No.5

The CO 2 air source heat pump (ASHP) has been widely used for space heating and domestic hot water because of its energy saving, high efficiency and environmental protection. However, when used for space heating, the high return water temperature causes higher throttle loss, which results in the energy efficiency of the system obviously decreasing. To solve this problem, a CO 2 ASHP integrated with thermal energy storage (TES) is proposed in this paper. A simulation model of the system was established by TRNSYS software, and the operating characters of the studied system were investigated under the typical daily operating conditions. Additionally, its performance was compared with the benchmark system. This research shows that the average unit COP of the studied system was increased by 14.1 % compared with the benchmark system. It indicates that TES is beneficial for promoting CO 2heat pump application in cold areas.