A Non-Stationary Geometry-Based Cooperative Scattering Channel Model for MIMO Vehicle-to-Vehicle Communication Systems

( Bin Qiu ),( Hailin Xiao ) 한국인터넷정보학회 2019 KSII Transactions on Internet and Information Syst Vol.13 No.6

Traditional channel models for vehicle-to-vehicle (V2V) communication usually assume fixed velocity in static scattering environment. In the realistic scenarios, however, time-variant velocity for V2V results in non-stationary statistical properties of wireless channels. Dynamic scatterers with random velocities and directions have been always utilized to depict the non-stationary statistical properties of the channel. In this paper, a non-stationary geometry-based cooperative scattering channel model is proposed for multiple-input multiple-output (MIMO) V2V communication systems, where a birth-death process is used to capture the appearance and disappearance dynamic properties of moving scatterers that reflect the time-variant time correlation and Doppler spectrum characteristics. Moreover, our model has more straight and concise to study the impact of the vehicular traffic density on channel characteristics and thus avoid complicated procedure in deriving the analytical expressions of the channel parameters and functions. The numerical results validate our analysis and demonstrate that setting important parameters of our model can appropriately build up more purposeful measurement campaigns in the future.

Variable amplitude fatigue test of M30 high-strength bolt in bolt-sphere joint grid structures

Bin Qiu,Honggang Lei,Xu Yang,Zichun Zhou,Guoqing Wang 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.33 No.3

Fatigue failure of a grid structure using bolt-sphere joints is liable to occur in a high-strength bolt due to the alternating and reciprocal actions of a suspension crane. In this study, variable amplitude fatigue tests were carried out on 20 40 Cr steel alloy M30 high-strength bolts using an MTS fatigue testing machine, and four cyclic stress amplitude loading patterns, Low-High, High- Low, Low-High-Low, and High-Low-High, were tested. The scanning electron microscope images of bolt fatigue failure due to variable amplitude stress were obtained, and the fractographic analysis of fatigue fractures was performed to investigate the fatigue failure mechanisms. Based on the available data from the constant amplitude fatigue tests, the variable amplitude fatigue life of an M30 high-strength bolt in a bolt-sphere joint was estimated using both Miner's rule and the Corten-Dolan model. Since both cumulative damage models gave similar predictions, Miner's rule is suggested for estimating the variable-amplitude fatigue life of M30 high-strength bolts in a grid structure with bolt-sphere joints; the S-N fatigue curve of the M30 high-strength bolts under variable amplitude loading was derived using equivalent stress amplitude as a design parameter.

Empty Container Repositioning with Stochastic Demand/Supply and Transportation Capacity

Zong-Bin Qiu,Il-Kyeong Moon 한국SCM학회 2008 한국SCM학회지 Vol.8 No.1

Intensity-Modulated Radiotherapy versus Three-Dimensional Conformal Radiotherapy in Definitive Chemoradiotherapy for Cervical Esophageal Squamous Cell Carcinoma: Comparison of Survival Outcomes and Toxicities

Nai-Bin Chen,Bo Qiu,Jun Zhang,Meng-Yun Qiang,Yu-Jia Zhu,Bin Wang,Jin-Yu Guo,Ling-Zhi Cai,Shao-Min Huang,Meng-Zhong Liu,Qun Li,Yong-Hong Hu,Qi-Wen Li,Hui Liu 대한암학회 2020 Cancer Research and Treatment Vol.52 No.1

Purpose The purpose of this study was to compare the survival and toxicities in cervical esophageal squamous cell carcinoma (CESCC) treated by concurrent chemoradiothrapy with either three-dimensional conformal radiotherapy (3D-CRT) or intensity-modulated radiotherapy (IMRT) techniques. Materials and Methods A total of 112 consecutive CESCC patients were retrospectively reviewed. 3D-CRT and IMRT groups had been analyzed by propensity score matching method, with sex, age, Karnofsky performance status, induction chemotherapy, and tumor stage well matched. The Kaplan- Meier method and Cox proportional hazards model were used for overall survival (OS) and progression-free survival (PFS). Toxicities were compared between two groups by Fisher exact test. Results With a median follow-up time of 34.9 months, the 3-year OS (p=0.927) and PFS (p=0.859) rate was 49.6% and 45.8% in 3D-CRT group, compared with 54.4% and 42.8% in IMRT group. The rates of grade ! 3 esophagitis, grade ! 2 pneumonitis, esophageal stricture, and hemorrhage were comparable between two groups, while the rate of tracheostomy dependence was much higher in IMRT group than 3D-CRT group (14.3% vs.1.8%, p=0.032). Radiotherapy technique (hazard ratio [HR], 0.09; 95% confidence interval [CI], 0.01 to 0.79) and pretreatment hoarseness (HR, 0.12; 95% CI 0.02 to 0.70) were independently prognostic of tracheostomy dependence. Conclusion No survival benefits had been observed while comparing IMRT versus 3D-CRT in CESCC patients. IMRT with fraction dose escalation and pretreatment hoarseness were considered to be associated with a higher risk for tracheostomy dependence. Radiation dose escalation beyond 60 Gy should be taken into account carefully when using IMRT with hypofractionated regimen.

Influence of Sleeve Material and Sleeve Composite Structure on Performance of High-Speed Permanent Magnet Starter-Generator for Micro-Gas Turbine

Qiu Hongbo,Liu Ziyang,Xiong Bin,Zhao Qiang,Dong Yu,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.4

When the high-speed permanent magnet starter-generator (PMSG) is operating, the permanent magnets will be aff ected by high centrifugal forces. It is necessary to add a sleeve to protect the rotor and interference fi t with the permanent magnet. However, the performance of the high-speed PMSG will be signifi cantly infl uenced by the electromagnetic characteristics of the sleeve material. In this paper, a high-speed permanent magnet starter-generator for the micro-gas turbine is used as an example, and the two-dimensional fi nite element model is established. The correctness of the model is verifi ed by comparing the experimental data with the calculated data. Taking 10,000 r/min as the ignition speed, the diff erences of motor starting performances when using diff erent sleeve materials are compared. Secondly, decoupling the complex coupling torque in the starting process, the infl uence of material electromagnetic characteristics on the asynchronous torque and braking torque is determined, and the infl uence mechanism of material electromagnetic characteristics on the torque characteristics of highspeed PMSG is revealed. In addition, the eff ects of the sleeve materials on the output performance and loss of the high-speed PMSG are determined, and infl uence mechanism is revealed. On the basis, a sleeve multiplexing scheme is proposed to improve the starting performance while reducing the eddy current losses in the generating state. The results of the study provide reference and theoretical value for the optimization of high-speed permanent magnet starter-generator.

First Report on Bacterial Heart Rot of Garlic Caused by Pseudomonas fluorescens in China

Bin Li,Rong Rong Yu,Shan Hong Yu,Wen Qiu,Yuan Fang,Guan Lin Xie 한국식물병리학회 2009 Plant Pathology Journal Vol.25 No.1

An unreported disease of garlic was observed in commercial fields in Jiangsu province, China. The symptoms started as water soaked lesions at the base of the leaves. Later, water-soaked areas developed on stems and spread to the internal tissues, followed by yellowing and necrosis along leaf edges and soft rot of the stems. The causal organism isolated from symptomatic plants was identified as Pseudomonas fluorescens based on its biochemical and physiological characteristics and confirmed by the cellular fatty acid composition and Biolog data as well as 16S rRNA gene sequence analysis. The bacterial isolates caused similar symptoms when inoculated onto garlic plants. In addition, leek and shallot were susceptible to the P. fluorescens pathogen. However, the P. fluorescens pathogen failed to cause any symptoms when it was inoculated onto 15 other plants. This is the first report of a bacterial disease of garlic caused by P. fluorescens in China.

Influence of Magnetic Slot Wedge on Parameter and Loss Distribution of High Voltage Induction Motor

Qiu Hongbo,Wang Kun,Liu Ziyang,Xiong Bin,Wu Xuandong 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6

Owing to the stator open slot structure of the high-voltage motor, the magnetic field distribution in the motor will be uneven, and the performance of the motor will deteriorate. When the slots are embedded with magnetic material slot wedges, the magnetic field of the motor will be changed. In this article, taking a 10 kV/1000 kW high-voltage induction motor (HVIM) as the prototype, the two-dimensional finite element models are established, the eff ect of magnetic slot wedge (MSW) on HVIM was analyzed. First, by establishing the air-gap permeance function, the infl uence of magnetic slot wedge on the air gap magnetic field is analyzed, the influence mechanism of magnetic slot wedge on tooth harmonic magnetic field is revealed. In addition, the effect of magnetic slot wedge on excitation inductance, slot leakage resistance, and winding inductance of HVIM is analyzed in detail, the variation of parameters with different relative permeability of slot wedge is summarized, the changes in the motor starting performance had further discussed. Finally, the influence of the slot wedge permeability on motor losses is studied, the distribution of core loss is obtained by establishing the motor segmenting model, and the various mechanisms of core losses in different regions are revealed. The findings provide the guidelines and theoretical basis for the rational selection of magnetic slot wedges.

Isoflavanones from the Stem of Cassia siamea and Their Anti-tobacco Mosaic Virus Activities

Qiu-Fen Hu,De-Yun Niu,Bin Zhou,Yan-Qing Ye,Gang Du,Chun-Yang Meng,Xue-Mei Gao 대한화학회 2013 Bulletin of the Korean Chemical Society Vol.34 No.10

Two new isoflavanones, (3R) 7,2',4'-trihydroxy-3'-methoxy-5-methoxycarbonyl-isoflavanone (1) and (3R) 7,2'-dihydroxy-3',4'-dimethoxy-5-methoxycarbonyl-isoflavanone (2), together with six known isoflavanones (3-8), were isolated from the stems of Cassia siamea. The structure of 1-8 was elucidated by spectroscopic methods including extensive 1D- and 2D-NMR techniques. Compounds 1, 2, 5-8 were evaluated for their antitobacco mosaic virus (Anti-TMV) activity. The results showed that compounds 1 and 6 showed potential anti- TMV activity with inhibition rates of 24.6% and 26.9%, respectively. Compounds 2, 5, 7, 8 also showed anti- TMV activity with inhibition rates in the range of 11.8-18.6%.

A Conflict Diagnosis Approach of Changing Sequences in Gene Ontology Evolution

Qiu Ling,Liu Yong,Song Yingjie,Zhang Bin 보안공학연구지원센터 2014 International Journal of Control and Automation Vol.7 No.6

Valeriana jatamansi Jones Inhibits Rotavirus-Induced Diarrhea via Phosphatidylinositol 3-Kinase/Protein Kinase B Signaling Pathway

( Bin Zhang ),( Yan Wang ),( Chunmao Jiang ),( Caihong Wu ),( Guangfu Guo ),( Xiaolan Chen ),( Shulei Qiu ) 한국미생물 · 생명공학회 2021 Journal of microbiology and biotechnology Vol.31 No.8

Rotavirus (RV), as the main cause of diarrhea in children under 5 years, contributes to various childhood diseases. Valeriana jatamansi Jones is a traditional Chinese herb and possesses antiviral effects. In this study we investigated the potential mechanisms of V. jatamansi Jones in RV-induced diarrhea. MTT assay was performed to evaluate cell proliferation and the diarrhea mice model was constructed using SA11 infection. Mice were administered V. jatamansi Jones and ribavirin. Diarrhea score was used to evaluate the treatment effect. The enzyme-linked immunosorbent assay was performed to detect the level of cytokines. Western blot and quantitative reverse transcription-PCR were used to determine protein and mRNA levels, respectively. Hematoxylin-eosin staining was applied to detect the pathological change of the small intestine. TdT-mediated dUTP nick-end labeling was conducted to determine the apoptosis rate. The results showed V. jatamansi Jones promoted MA104 proliferation. V. jatamansi Jones downregulated phosphatidylinositol 3-kinase (PI3K) and protein kinase B (AKT) in protein level, which was consistent with the immunohistochemistry results. Moreover, V. jatamansi Jones combined with ribavirin regulated interleukin-1β (IL-1β), interferon γ, IL-6, tumor necrosis factor α, and IL-10, and suppressed secretory immunoglobulin A secretion to remove viruses and inhibit dehydration. V. jatamansi Jones + ribavirin facilitated the apoptosis of small intestine cells. In conclusion, V. jatamansi Jones may inhibit RV-induced diarrhea through PI3K/AKT signaling pathway, and could therefore be a potential therapy for diarrhea.