Performance of the R-way Colposcopic Evaluation System in Cervical Cancer Screening

Zhao, Jian,Zhang, Xi,Chen, Rui,Zhao, Yu-Qian,Wang, Ting-Ting,He, Shan,Qiao, You-Lin Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.10

Objective: To investigate the diagnostic value of the R-way colposcopic evaluation system (R-way system) in cervical cancer screening. Materials and Methods: Between August 2013 and August 2014, a total of 1,059 cases referred to colposcopy in Peking University First Hospital were studied using both the R-way system and conventional colposcopy. Our study evaluated and compared the diagnostic ability of the two methods in detecting high-grade lesions and cervical cancer (hereinafter called CIN2+). Evaluation indicators including sensitivity, specificity, positive predictive value (PPV), negative predictive value (NPV), Youden index and the area under the curve (AUC) of the receiver operating characteristic (ROC) were calculated. Results: The R-way system had a slightly lower specificity (94.5%) than conventional colposcopy (96.0%) for CIN2+ detection (P=0.181). However, the sensitivity (77.8%) was significantly higher than with the conventional colposcopic method (46.6%) (${\chi}^2=64.351$, P<0.001). In addition, the AUC of the ROC for CIN2+ detection using the R-way system (0.839) was larger than that with conventional colposcopy (0.731) (Z=4.348, P<0.001). If preliminary result had been drawn from cervical exfoliated cytology before colposcopy referral, combination of the R-way system with cytology could increase the sensitivity to 93.9% for CIN2+ detection (excluding ASCUS\LSIL), confirmed by multipoint biopsy or ECC. Conclusions: The diagnostic value of the R-way evaluation system is higher than that of conventional colposcopic evaluation in cervical cancer screening. Moreover, taking the ease of use and standardized quality control management into account, the R-way system is highly preferable.

Schedule Optimization for Ttethernet-based Time-triggered Automotive Systems

Zhao Rui,Qin Guihe,Yan Jie,Qin Jun 한국자동차공학회 2020 International journal of automotive technology Vol.21 No.6

TTEthernet is a new high availability network protocol for the automotive domain, providing support for the transmissions of time-critical periodic frames in a time-triggered (TT) traffic and event-triggered frames in a rate-constrained (RC) or best-effort (BE) traffic. The design of a system scheduling with communication over the TTEthernet is not an easy task because of protocol and timing constraints as well as the demand for high quality-of-service and extensibility. In this paper, we study the co-optimization problem of the tasks and signals scheduling for TTEthernet-based time-triggered automotive systems. We propose a Mixed-Integer Linear Programming (MILP) framework for optimizing the signal packing, signal scheduling and task scheduling, subject to all protocol, processor and timing constraints with respect to latency- or extensibility- related metrics. Extensive experiments are conducted to evaluate the effectiveness and efficiency of the proposed approach in a variety of scenarios.

Relative Diagnosability of Discrete-Event Systems and Its Opacity-Based Test Algorithm

Rui Zhao,Fuchun Liu,Zhusong Liu 제어·로봇·시스템학회 2017 International Journal of Control, Automation, and Vol.15 No.4

The notion of relative diagnosability is proposed for logical automata and the concept of diagnosablerate is introduced to characterize the diagnosability property of a discrete-event system, which takes values in theinterval [0, 1]. The relationship between relative diagnosability and diagnosability introduced by Sampath et al. that relative diagnosability is weaker than diagnosability for discrete-event systems is analysed. Furthermore, anecessary and sufficient condition for relative diagnosability is presented. In particular, an opacity-based algorithmis developed to test the relative diagnosability, which is polynomial in the number of states of the system. Inaddition, the proposed algorithm may be used to deal with the problem of diagnosability.

Fabrication, Microstructure and Compression Properties of AZ31 Mg Foams

Zhao, Rui,Li, Yuxuan,Jeong, Seung-Reuag,Yue, Xuezheng,Hur, Bo-Young Materials Research Society of Korea 2011 한국재료학회지 Vol.21 No.6

Melt foaming method is one of cost-effective methods to make metal foam and it has been successfully applied to fabricate Mg foams. In this research, AZ31 Mg alloy ingot was used as a metal matrix, using AlCa granular as thickening agent and $CaCO_3$ powder as foaming agent, AZ31 Mg alloy foams were fabricated by melt-foaming method at different foaming temperatures. The porosity was above 41.2%~73.3%, pore size was between 0.38~1.52 mm, and homogenous pore structures were obtained. Microstructure and mechanical properties of the AZ31 Mg alloy foams were investigated by optical microscopy, SEM and UTM. The results showed that pore structure and pore distribution were much better than those fabricated at lower temperatures. The compression behavior of the AZ31 Mg alloy foam behaved as typical porous materials. As the foaming temperature increased from $660^{\circ}C$ to $750^{\circ}C$, the compressed strength also increased. The AZ31 Mg alloy foam with a foaming temperature of $720^{\circ}C$ had the best energy absorption. The energy absorption value of Mg foam was 15.52 $MJ/m^3$ at a densification strain of 52%. Furthermore, the high energy absorption efficiencies of the AZ31 Mg alloy foam kept at about 0.85 in the plastic plateau region, which indicates that composite foam possess a high energy absorption characteristic, and the Vickers hardness of AZ31 Mg alloy foam decreased as the foaming temperature increased.

Phase Transition of As-Milled and Annealed CrCuFeMnNi High-Entropy Alloy Powder

Rui-Feng Zhao,Bo Ren,Guo-Peng Zhang,Zhong-Xia Liu,Jian-Jian Zhang 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2018 NANO Vol.13 No.09

The CrCuFeMnNi high entropy alloy (HEA) powder was synthesized by mechanical alloying. The effects of milling time and subsequent annealing on the structure evolution, thermostability and magnetic property were investigated. After 50 h of milling, the CrCuFeMnNi HEA powder consisted of a major FCC phase and a small amount of BCC phase. The crystallite size and strain lattice of 50 h-ball-milled CrCuFeMnNi HEA powder were 12 nm and 1.02%, respectively. The powder exhibited refined morphology and excellent chemical homogeneity. The supersaturated solid solution structure of the as-milled HEA powder transformed into FCC1, FCC2, a small amount of BCC and ρ phase in annealed state. Most of the BCC phase decomposed into FCC (mainly FCC2 phase) and ρ phases, and the dynamic phase transition was almost in equilibrium at 900 ℃. The saturated magnetization and coercivity force of the 50 h-ball-milled CrCuFeMnNi HEA powder were respectively 16.1 emu/g and 56.2 Oe.

Research on Vehicle-Induced Vibration of Pedestrian Bridge and Its Application in Comfort Evaluation

Zhao Rui,Wu Yuhang,Dan Danhui 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.1

The vibration responses of pedestrian bridges are mainly caused by two transmission routes of ground and airfl ow under vehicle excitation. In order to clarify the action mechanism and infl uence degree of ground excitation and airfl ow excitation on pedestrian bridges, based on stochastic theory and fl ow fi eld analysis method, the calculation models of vehicle-induced ground excitation and airfl ow excitation considering the infl uence of vehicle length, vehicle width and bridge deck width are established respectively. Considering the eff ects of vehicle speed, road grade, and vehicle mass, the vibration response of a continuous steel box girder pedestrian bridge under the two transmission routes was analyzed in this study. The laws of vibration acceleration and stress were summarized, and the accuracy of the fi nite element model and the laws were verifi ed by fi eld-measured data. Results show that road grade and vehicle mass are the main factors causing the vibrations of pedestrian bridges under vehicle excitation. Vehicle speed has a great infl uence on structural vibration under airfl ow excitation. The vibration response is the largest at mid-span along the pedestrian bridge-length direction. When the vehicle speed is less than about 60 km/h, the infl uence of the airfl ow excitation on the structure may not be considered. On this basis, the comfort level of the pedestrian bridge was evaluated using the British Standards Institution. The given evaluation criteria of the pedestrian bridge complement the design regulations of the pedestrian bridge.

Simulation of Position based Robotic Visual Servo

Rui Zhao,Maheshwar Pd. Sah,Hyongsuk Kim,FU Zhu-mu 제어로봇시스템학회 2010 제어로봇시스템학회 합동학술대회 논문집 Vol.2010 No.12

This paper presents a complete design methodology for Cartesian position based visual servo control of robots with a single camera mounted on the end-effectors. Generally Position based visual servo control requires explicit calculation of the relative position and orientation of the object with respect to the camera. In Position based visual servo, the image capturing and processing time cannot be neglected and also the process of estimating the object position is greatly affected by noise. In this paper, Kalman filter is implemented on the visual servo for the estimation of object motion. In order to control it’s angle and position, a PD controller adjust PD parameters to minimize the exceedance and respond-time, and results the emulator to approve the PD arithmetic which reduces the influence of noise and time elapse compare to the position based visual servo method. The features of algorithm, is verified by simulation results

Effect of the COMBDry Dewatering Process on Combustion Reactivity and Oxygen-Containing Functional Groups of Dried Lignite

Zhao, Yaying,Zhao, Guangbo,Sun, Rui,Liu, Hui,Wang, Zhuozhi,Sihyun, Lee,Kong, Ming American Chemical Society 2017 ENERGY AND FUELS Vol.31 No.4

<P>Two typical types of Chinese lignite samples were employed to investigate the coal drying characteristics of an innovative COMBDry lignite drying system. The drying rate increased significantly with an increase in drying temperature and ratio of the flue gas, to the lignite. Using a nitrogen adsorption instrument, it was found that the drying process promoted generation and enlargement of the surface pore structures of the particles, which can enhance coal combustion rate. A horizontally fixed bed furnace and a SIGNAL S4i pulsar NDIR (infrared (IR)) gas analyzers were used to investigate the combustion characteristics of coal samples after the drying treatment. In an attempt to analyze the variation in the sample surface chemical structure during the drying process, Fourier transform infrared (FT-IR) spectrometry and Raman spectroscopy were employed for the investigation. The results showed that the concentration of aliphatic hydrogen decreased with an increase in drying temperature and resulted from the decomposition of oxygen-containing complexes (released CO and CO2) and reaction with hydroxyl groups. The number of functional groups decreased when the drying temperature exceeded 210 degrees C. The amount of carbonyl and carboxylic esters initially increased and then (210 degrees C) decreased with an increase in flue gas temperature, and the content of aromatic carbon was unchanged with the treatment. The ordered crystalline carbon changed into the crystal defect structure and amorphous carbon and the degree of graphitization decreased and thus the combustion reactivity of the dried lignite was improved.</P>

Autoxidation of Cycloalkenes by the System “Molecular Oxygen-bis(acetylacetonato) Cobalt (II) Complex-butyraldehyde”

Zhao Fang,Rui-ren Tang,Rui-rong Zhang,Ke-long Huang 대한화학회 2009 Bulletin of the Korean Chemical Society Vol.30 No.10

Oxidation of cycloalkenes with O2 promoted by heterogeneous bis(acetylacetonato) cobalt (II) complex catalyst which can be recycled has been performed under mild conditions. It was found that β-ionone, cyclohexene,1-methylcyclohexene, and α-ionone were efficiently oxidized with O2 in the presence of Co (II) complex and butyraldehyde at 55 oC. A simple treatment of the resulting products led to epoxides as predominant products and a small amounts of allylic oxides, the chemoselectivity for the former being 82.1 - 90.8% with a 70.6 - 98.6% substrate conversion. On the other hand, oxidation of 1-phenylcyclohexene, 1-cyclohex-1-enylethan-1-one, α-pinene, and β-pinene gave allylic oxides as major products.

An Offline Current-Mode PFM Controller for Low Power Residential LED Lighting with Primary-Side Constant Current Regulation Techniques

Yong-Rui Zhao,Xin-Quan Lai 보안공학연구지원센터 2013 International Journal of Smart Home Vol.7 No.5