Safety-field-based Path Planning Algorithm of Lane Changing for Autonomous Vehicles

Xiaoxing Lv,Weihua Li,Jianfeng Wang 제어·로봇·시스템학회 2022 International Journal of Control, Automation, and Vol.20 No.2

This study presents a novel planning approach of lane changing for autonomous vehicles to ensure multiagent safety and comfortability in riding. First, a risk assessment model, Safety Field, combined with field theory and kinematics model was defined considering the passengers’ subjective feelings to identify the long-term safety trends. Based on the safety field, a new planning algorithm named S algorithm was developed, which was inspired by the A* algorithm. The special grid map, the lists, and the evaluation function designed in the S algorithm enabling its application to complex dynamic situations while considering riding safety and riding comfort. And the proposed path planning method has good scalability that we extend its application scenarios from straight roads to curved roads. Finally, the S algorithm was validated in virtual traffic environments on straight and curved roads, and the results from the test cases demonstrated the effectiveness and scalability of the algorithm.

Identification of Loop Nucleotide Polymorphisms Affecting MicroRNA Processing and Function

Xiaoxing Xiong,Shengmei Zhu,Xianhui Kang,Yueying Zheng,Sibiao Yue 한국분자세포생물학회 2013 Molecules and cells Vol.36 No.6

MicroRNAs are short 21-22 nucleotide single strand RNAs that are involved in post-transcriptional regulation of gene expression. Most microRNAs are first transcribed as long primary microRNAs and then undergo a two step-wise sequential processing to yield single-stranded mature microRNAs. It has been suggested that the loop region of primary microRNAs plays an important role in regulating microRNA biogenesis and target recognition. However, despite the fact that several single nucleotide polymorphisms have been identified in mature microRNA sequences and are related to human diseases, it remains unclear whether and how the single nucleotide polymorphisms in the loop regions of primary microRNAs would affect the biogenesis and function of microRNAs. Herein, we provide evidence that primary microRNAs loop nucleo-tides control the accuracy and efficiency of microRNA processing. Accordingly, we identified 32 single nucleotide polymorphisms in the loop regions of human primary microRNAs using bioinformatics, and further validated three loss-of-function and one gain-of-function single nucleotide polymorphisms using dual-luciferase assays. Thus, these results reveal a critical regulatory role encoded in the loop nucleotides of primary microRNAs for microRNA processing and function.

Antioxidant properties of a vegetable–fruit beverage fermented with two Lactobacillus plantarum strains

Xiaoxing Yang,Jiachun Zhou,Liqiang Fan,Zhen Qin,Qiming Chen,Liming Zhao 한국식품과학회 2018 Food Science and Biotechnology Vol.27 No.6

Fermented vegetable–fruit beverages are a popular fermented food, with many potential health benefits. In this study, two commercial Lactobacillus plantarum strains were selected to ferment a beverage containing apples, pears, and carrots. The metabolites and antioxidant activities were examined during the fermentation process. Results showed that lactic acid and acetic acid accumulated gradually, whereas malic acid decreased. Glucose and fructose increased from 0.48 and 14.8 g/L to 7.7 and 20.8 g/L, respectively, while sucrose decreased slightly. Ascorbic acid also increased continuously during the fermentation to 90.74 mg/100 mL. DPPH and ABTS radical scavenging activity and FRAP reached their maximum value after 4–8 days. The accumulation of TPC, TFC, and SOD reached their maximum value on the 8th day of fermentation. Our study revealed that the L. plantarum-fermented vegetable–fruit beverage showed significant antioxidant activity, which is helpful in evaluating the fermentation end-point and developing a high-quality fermented beverage.

Experimental Study on Thermal Catalytic Degradation of SF6 Waste Gas by Metal Phosphate

Zhang Xiaoxing,Li Xiaohan,Wang Yi,Meng Fei,Zou Yi,Tian Shuangshuang,Cui Zhaolun 대한전기학회 2023 Journal of Electrical Engineering & Technology Vol.18 No.2

In recent years, SF6 has been widely used in the electrical industry. The amount of SF6 waste gas produced by the corresponding gas insulated equipment is increasing year by year. However, SF6 has high global warming potential and long atmospheric life. Proper treatment of SF6 waste gas is particularly important for environmental protection. Thermal degradation can effectively eliminate the greenhouse effect caused by direct emission of SF6. In this paper, AlPO4, Zr3(PO4)4 and CePO4 were used as catalysts to degrade SF6/air mixture gas (The concentration of SF6 is 15%) at 800 °C. The concentration of SF6 gas was detected by gas chromatography (GC), and the gas decomposition products of SF6 were detected by gas chromatography mass spectrometry (GCMS) and fourier transform infrared spectroscopy (FTIR). The surface morphology and composition of the catalyst were analyzed by scanning electron microscope (SEM) and X-ray photoelectron spectroscopy (XPS). The results show that the three kinds of metal phosphates can promote the decomposition of SF6 gas, among which CePO4 had the best catalytic degradation effect, and the degradation rate of SF6 reached 84.7% in 12 h. The main products of SF6 gas thermal catalytic degradation include SF4, S2F10, SO2F2, SOF2, SiF4 and SO2 gas, etc. SEM scanning image shows that there were some objects adsorbed on the surface of CePO4 catalyst after the experiment. XPS spectra showed that Si and F elements were added to the catalyst. According to the binding energy, SiF4 was adsorbed on the catalyst. After the experiment, CeF3 was produced by CePO4 catalyst. Different catalysts have their own selectivity to the decomposition products of SF6, which is convenient for the treatment of products, and it is of great significance to eliminate the greenhouse effect caused by the waste gas of SF6.

面向韓國漢語教育的漢語口語語料庫建設及價值

許小星 ( Xu Xiaoxing ),朴庸鎭 ( Park Yongjin ) 고려대학교 중국학연구소 2021 中國學論叢 Vol.- No.74

This paper introduces the preparation and application value of a corpus of spoken Chinese for Korean learners. Firstly, the principles and process of building a corpus of Korean learners' spoken Chinese are described. Then, the difficulties encountered in the process of building the corpus and the corresponding countermeasures are analyzed emphatically. The corpus is important for developing word lists and grammar syllabus for Korean Chinese language teaching, as well as for compiling Korean-oriented Chinese teaching practices and nationalized Chinese teaching materials. At the same time, the corpus helps to improve the teaching of phonetics, vocabulary, grammar, and corpora in nationalized Chinese language teaching.

韓語背景CSL學習者作文發展狀況硏究

許小星(Xu, Xiaoxing),胡曉?(Hu, Xiaoqing),樸炳仙(Park, Byungseon) 한국중국어교육학회 2018 중국어교육과연구 Vol.0 No.27

With the further development of the research on interlanguage and second language acquisition, the Chapter problems of Chinese Interlanguage have gradually become an important field of research. Based on the Developing Corpus of Chinese Interlanguage for Korean Students, this paper carries out a longitudinal follow-up collection and Investigation on the four-term chapter data of 8 special learners among the CSL learners with Korean background, investigates the language situation of the special learners in the different study sections, meanwhile pays more attention to the longitudinal development of their syntactic accuracy and chapter continuity in the chapter.

Theoretical study on electrical behavior of carbon chain inserted single-walled carbon nanotubes compared with Pt doped one

Hao Cui,Xiaoxing Zhang,Hanyan Xiao,Ju Tang 한국탄소학회 2018 Carbon Letters Vol.25 No.-

Carbon chain inserted carbon nanotubes (CNTs) have been experimentally proven having undergone pronounced property change in terms of electrical conductivity compared with pure CNTs. This paper simulates the geometry of carbon chain inserted CNTs and analyzes the mechanism for conductivity change after insertion of carbon chain. The geometric simulation of Pt doped CNT was also implemented for comparison with the inserted one. The results indicate that both modification by Pt atom on the surface of CNT and addition of carbon chain in the channel of the tube are effective methods for transforming the electrical properties of the CNT, leading to the redistribution of electron and thereby causing the conductivity change in obtained configurations. All the calculations were obtained based on density functional theory method.

Geometric structure and electronic behavior of Rh decorating effect on zigzag CNTs (n=7-12): A DFT study

Hao Cui,Xiaoxing Zhang,Yongjian Zhou,Jun Zhang 한국탄소학회 2018 Carbon Letters Vol.26 No.-

Comprehensive calculations of the Rh decoration effect on zigzag CNTs with n ranging from 7 to 12 were conducted in this work to understand the effect of Rh doping on geometric structures and electronic behaviors upon metallic and semiconducting CNTs. The obtained results indicated that Rh dopant not only contributes to the deformation of C-C bonds on the sidewall of CNTs, but also transforms the electron distribution of related complexes, thereby leading to a remarkable increase of the conductivity of pure CNTs given the emerged novel state within the energy gap for metallic CNTs and the narrowed energy gap for semiconducting CNTs. Our calculations will be meaningful for exploiting novel CNT-based materials with better sensitivity to electrons and higher electrical conductivity compared with pure CNTs.

Rh-doped carbon nanotubes as a superior media for the adsorption of O2 and O3 molecules: a density functional theory study

Hao Cui,Xiaoxing Zhang,Qiang Yao,Yulong Miao,Ju Tang 한국탄소학회 2018 Carbon Letters Vol.28 No.-

Transition-metal-embedded carbon nanotubes (CNTs) have been accepted as a novel type of sensing material due to the combined advantage of the transition metal, which possesses good catalytic behavior for gas interaction, and CNTs, with large effective surface areas that present good adsorption ability towards gas molecules. In this work, we simulate the adsorption of O2 and O3 onto Rh-doped CNT in an effort to understand the adsorbing behavior of such a surface. Results indicate that the proposed material presents good adsorbing ability and capacities for these two gases, especially O3 molecules, as a result of the relatively large conductivity changes. The frontier molecular orbital theory reveals that the conductivity of Rh-CNT would undergo a decrease after the adsorption of two such oxidizing gases due to the lower electron activity and density of this media. Our calculations are meaningful as they can supply experimentalists with potential sensing material prospects with which to exploit chemical sensors.

SF6 abatement in a packed bed plasma reactor: Role of zirconia size and optimization using RSM

Yuan Tian,Xiaoxing Zhang,Yufei Wang,Zhaolun Cui,Ju Tang 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-

This work describes plasma destruction of SF6 in a zirconia (ZrO2) packed bed plasma reactor (PBR). Electric signals, equivalent parameters, emission spectra and degradation results have been utilized toevaluate the influence of ZrO2 size on PBR discharge characteristics and SF6 degradation. The resultspresent that the size of ZrO2 has a significant impact on PBR discharge characteristics due to its influenceon physical parameters. Moreover, bigger ZrO2 beads packing shows a better performance in SF6degradation because of longer gas residence time. In addition, the key operating parameters includingflowrate, SF6 concentration, oxygen concentration, and water vapor concentration were optimized byresponse surface methodology (RSM) with Box-Behnken design (BBD). The proposed optimization modelshows satisfactory correlation between the predicted and actual results. For energy yield (EY), the mutualeffect offlowrate, SF6 concentration and water vapor concentration was significant. For SO2F2 selectivity,the mutual effect of SF6 concentration and water vapor concentration was significant. The optimum SF6abatement was predicted from RSM as 14.64 g/kWh and 14.42% for EY and SO2F2 selectivity atflowrate of200 mL/min, SF6 concentration of 3%, oxygen concentration of 0.83% and water vapor concentration of1.89%.