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Search Results: 1 - 10 of 11979 matches for " Shirong Yin "
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Bearing Degradation Process Prediction Based on the Support Vector Machine and Markov Model
Shaojiang Dong,Shirong Yin,Baoping Tang,Lili Chen,Tianhong Luo
Shock and Vibration , 2014, DOI: 10.1155/2014/717465
Abstract: Predicting the degradation process of bearings before they reach the failure threshold is extremely important in industry. This paper proposed a novel method based on the support vector machine (SVM) and the Markov model to achieve this goal. Firstly, the features are extracted by time and time-frequency domain methods. However, the extracted original features are still with high dimensional and include superfluous information, and the nonlinear multifeatures fusion technique LTSA is used to merge the features and reduces the dimension. Then, based on the extracted features, the SVM model is used to predict the bearings degradation process, and the CAO method is used to determine the embedding dimension of the SVM model. After the bearing degradation process is predicted by SVM model, the Markov model is used to improve the prediction accuracy. The proposed method was validated by two bearing run-to-failure experiments, and the results proved the effectiveness of the methodology. 1. Introduction Bearing is one of the most important components in rotating machinery. Accurate bearing degradation process prediction is the key to effective implement of condition based maintenance and can prevent unexpected failures and minimize overall maintenance costs [1, 2]. To achieve effective degradation process prediction of the bearing, firstly, the features should be extracted from the collected vibration data. Then, based on the extracted features effectively prediction models should be selected [3]. Feature extraction is the process of transforming the raw vibration data collected from running equipment to relevant information of health condition. There are three types of methods to deal with the raw vibration data: time domain analysis, frequency domain analysis, and time-frequency domain analysis. The three types of methods are often chosen to extract the feature. For example, Yu [4] chose the time domain and the frequency domain transform to describe the characteristics of the vibration signals. Yan et al. [5] chose the short-time Fourier transform to extract the features. Ocak et al. [6] chose the wavelet packet transform to extract the feature of bearing wear information. Because the frequency features from FFT analysis results often tend to average out transient vibrations and thus not providing a wholesome measure of the bearing health status, in this paper, the time domain and the time-frequency domain characteristics are used to extract the original features. Although the original features can be extracted, they are still with high dimension and include
Identification of a novel KCNQ1 mutation associated with both Jervell and Lange-Nielsen and Romano-Ward forms of long QT syndrome in a Chinese family
Su Zhang, Ke Yin, Xiang Ren, Pengyun Wang, Shirong Zhang, Lingling Cheng, Junguo Yang, Jing Liu, Mugen Liu, Qing Wang
BMC Medical Genetics , 2008, DOI: 10.1186/1471-2350-9-24
Abstract: A Chinese family with both RWS and JLNS was identified. Family members were diagnosed based on the presence of a prolonged QT interval as seen on a 12-lead ECG and a medical history of syncope, palpitation, and deafness. Mutational studies in the KCNQ1 potassium channel gene were performed using direct DNA sequence analysis and restriction length polymorphism analysis.The proband in the Chinese family and her brother had previously been diagnosed with JLNS, and two other members were affected with RWS. The proband was also affected with atrial fibrillation. A single nucleotide substitution of C to T at nucleotide 965 of KCNQ1 was identified, and the mutation resulted in the substitution of a threonine residue at codon 322 by a methionine residue (T322M). The novel heterozygous T322M mutation was identified in two patients with RWS, one member with borderline QTc, and two normal family members. The two JLNS patients in the family carried the homozygous T322M mutation. The T322M mutation was not found in 200 Chinese normal controls.Our results suggest that T322M is a novel mutation that caused RWS with high intrafamilial variability in the heterozygous carriers and typical JLNS in the homozygous carriers within this Chinese family. The T322M mutation is the first mutation identified for JLNS in the Chinese population.Long QT syndrome (LQTS) is a disorder of cardiac repolarization characterized by prolonged QT intervals and abnormal T waves on surface electrocardiograms (ECG), torsade de pointes, and sudden death [1-3]. Two forms of inherited LQTS have been described: Romano-Ward syndrome (RWS), which is an autosomal dominant form of LQTS without sensorineural deafness, and Jervell and Lange-Nielsen syndrome (JLNS), which is an autosomal recessive form of LQTS associated with deafness [4-6].RWS is the most common form of inherited LQTS [7]. More than nine genes have been identified for RWS:KCNQ1 (or KvLQT1, LQT1) [8] on chromosome 11p15.5, KCNH2 (or HERG, LQT2) on chro
Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system
HongTao Liu,ShiRong Ge
Chinese Science Bulletin , 2008, DOI: 10.1007/s11434-008-0203-y
Abstract: MiaoXAM2.5X-50X Ultrahigh Precision Surface 3D Profiler is introduced to research the relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system. Research results show that thickness of wear debris owns evident classification, and the first grade thickness math model and the second grade thickness math model are built. By the second grade thickness math model, the true force condition in the tribological system can be gotten, and the model can be used as a tool to modify simulating parameters of the tribological system, and it is an important inspecting method to the airtight system which cannot be examined in real time. The first grade thickness math model can describe the true working load and surface condition of work piece in the tribological system, and is an effective description method for the running condition of frictional pairs. The research results at different lubricating conditions testify the relations between thicknesses of wear debris and positive pressure of the tribological system. The fractal relation between maximal thickness of wear debris and positive pressure is discussed. The conceptions of the immutability principle and characteristic granularity of wear debris thickness are brought forward and discussed. In conclusion, as a stable tribological parameter owning mechanical theory basis, wear debris thickness will play an important part in fault diagnosis, especially for the airtight system such as artificial joint.
Friction behavior of coupling motion for natural articular cartilage by reciprocating rotation
ShanHua Qian,ShiRong Ge
Chinese Science Bulletin , 2009, DOI: 10.1007/s11434-009-0075-9
Abstract: Based on the irregular surface of natural cartilage configurations, the tribological characteristics of coupling motion between natural cartilage pairs were investigated by the variation of rotated offset and velocity. Contact displacement, contact load, friction force and coefficient of friction from natural cartilage pairs were measured by a UMT-2 testing machine. In order to obtain the steady part and wavy part, the contact load and contact displacement were decompounded by the five-point sliding average method. These results showed that the contact load was composed of steady load and wavy load. And the contact displacement was composed of cartilage deformation and surface outline. The steady load was similar to exterior load while natural cartilage deformation increased nonlinearly with the sliding time. Wavy load had the correlative coefficient 0.235 with surface outline due to the irregular surface of friction configurations. The coefficient of friction from cartilage friction configurations was less influenced by smaller magnitude in rotated parameters. A few strange summits were obtained in the area of coefficient of friction, and significantly related with local minimal values corresponding to the contact loads. The rotated offsets had clear impact on contact load and a slight impact on contact displacement. Larger offset produced higher wavy magnitude of the contact load. The rotated velocities played an evident role in cartilage deformation, but had a less influence on contact load. Lower velocity brought larger cartilage deformation.
Description to wear debris boundaries by radar graph fractal method
HongTao Liu,ShiRong Ge
Chinese Science Bulletin , 2007, DOI: 10.1007/s11434-007-0307-9
Abstract: In this paper, radar graph fractal method is introduced to describe wear debris boundaries. Research results show that it is a nice way to describe wear debris boundaries. Since the longest axis is selected as the first coordinate axis, its center point selected as the center point of the radar graph, and the coordinate value of wear debris boundary selected as the measure parameter, the limitations existing in Yard fractal measure method can be avoided. For any wear debris, its radar graph fractal dimension value is one and only, and as the wear debris shape changes from round to strip, the radar graph fractal dimension value also changes from low to high, showing strong uniqueness and independence. Due to the fact that the researched wear debris is gotten in different wear states, the results also prove that radar graph fractal dimension value is correlated with frictional pairs work condition and wear state. Radar graph fractal method is compared with Yard fractal measure methods, and results show that radar graph fractal dimension values gotten from different wear debris have enough value grads to avoid effect of errors, and provide higher sensitivity for wear debris shape. This paper also discusses the influencing factors for radar graph fractal method. With the increase of the decomposing degree value, the radar graph fractal dimension tends to keep stable at one certain value, showing the typical characteristic of the fractal theory. All this proves that radar graph fractal method is an effective description method for wear debris boundaries.
The Semiotic Analysis on the Appearance of Chinese and American Pavilions in Shanghai Expo
Shirong Zhang,Fan Yang
Journal of Language Teaching and Research , 2012, DOI: 10.4304/jltr.3.1.141-146
Abstract: To avoid the inconvenience caused by cultural misunderstanding, it is necessary to get to know other cultures. World expo provides a chance for people to learn different cultures. As the representatives of their countries, appearance of pavilions can reflect their unique culture vividly. From the perspective of semiotics, this paper mainly analyzes the cultural connotations reflected in the elements of Chinese and American pavilions’ appearance. The paper also discusses the deep roots of differences of the two cultures with the help of Kluckhohn and Strodtbeck’s value orientations.
Friction behavior of coupling motion for natural articular cartilage by reciprocating rotation

ShanHua Qian,ShiRong Ge,

科学通报(英文版) , 2009,
Abstract: Based on the irregular surface of natural cartilage configurations, the tribological characteristics of coupling motion between natural cartilage pairs were investigated by the variation of rotated offset and velocity. Contact displacement, contact load, friction force and coefficient of friction from natural cartilage pairs were measured by a UMT-2 testing machine. In order to obtain the steady part and wavy part, the contact load and contact displacement were decompounded by the five-point sliding average method. These results showed that the contact load was composed of steady load and wavy load. And the contact displacement was composed of cartilage deformation and surface outline. The steady load was similar to exterior load while natural cartilage deformation increased nonlinearly with the sliding time. Wavy load had the correlative coefficient 0.235 with surface outline due to the irregular surface of friction configurations. The coefficient of friction from cartilage friction configurations was less influenced by smaller magnitude in rotated parameters. A few strange summits were obtained in the area of coefficient of friction, and significantly related with local minimal values corresponding to the contact loads. The rotated offsets had clear impact on contact load and a slight impact on contact displacement. Larger offset produced higher wavy magnitude of the contact load. The rotated velocities played an evident role in cartilage deformation, but had a less influence on contact load. Lower velocity brought larger cartilage deformation. Contributed equally to this work Supported by the National Natural Science Foundation of China (Grant No. 50535050)
Relations between thickness of UHMWPE’s wear debris and positive pressure of tribological system
LIU HongTao,GE ShiRong,

科学通报(英文版) , 2008,
Abstract:
A preliminary study on the treatment of bruxism by biofeedback therapy  [PDF]
Xuemeng Yin, Xinmin Yin
Open Journal of Stomatology (OJST) , 2014, DOI: 10.4236/ojst.2014.41001
Abstract:

Objective: To evaluate the effect of wireless biofeedback therapy on bruxism. Methods: Fifteen bruxiers participated to be treated by this therapy. The abnormal movements of teeth during sleep were monitored by a maxillary splint with an electric resistance strain gauge. Meanwhile, the receiver device recorded these details and analyzed the data, including the value of the biting force, occurring time and duration. If the value of biting force or duration exceeds the threshold, a vibrating device like a watch style will alert the patient to relax the masticatory muscles and nervous system to stop the abnormal grinding or clenching. Data were recorded during 8 hours’ sleep and analyzed after the 12 weeks’ treatment and 24 weeks’ treatment. Results: The average episodes of bruxism have declined from (10.60 ± 1.23) to (6.60 ± 0.75) after 12 weeks’ treatment (p < 0.05), and the average duration of bruxism events was reduced from (13.2 ± 0.74) s to (6.50 ± 0.40) s (p < 0.05). The average episodes of bruxism have declined to (3.80 ± 0.64) after 24 weeks’ treatment, and the average duration of bruxism events was reduced to (3.37 ± 0.34) s (p < 0.05). Conclusions: The results suggest that biofeedback therapy can be effective for bruxism treatment.

The Influence of Na and Ti on the In Vitro Degradation and Bioactivity in 58S Sol-Gel Bioactive Glass
Shirong Ni,Ruilin Du,Siyu Ni
Advances in Materials Science and Engineering , 2012, DOI: 10.1155/2012/730810
Abstract: The aim of this study was to investigate the effect of Na and Ti on the in vitro degradation and bioactivity in the 58S bioactive glass. The degradation was evaluated through the activation energy of Si ion release from bioactive glasses and the weight loss of bioactive glasses in Tris-HCl buffer solution. The in vitro bioactivity of the bioactive glasses was investigated by analysis of apatite-formation ability in the simulated body fluid (SBF). The results showed that Na in the 58S glass accelerated the dissolution rate of the glass, whereas Ti in the 58S glass slowed down the rate of glass solubility. Bioactivity tests showed that Na in glass increased the apatite-forming ability in SBF. In contrast, Ti in glass retards the apatite formation at the initial stage of SBF soaking but does not affect the growth of apatite after long periods of soaking. 1. Introduction For hard tissue repair, the controlled bioactivity and degradation of materials are required to meet different clinical requirements. However, there are also shortcomings of individual material for its intended medical applications. Then the design of hybrid materials offers an exceptional opportunity to allow good control of material properties. Bioactive glasses have been studied for more than 30 years since Hench et al. invented melt bioactive glass 45S5 with four components of CaO, SiO2, Na2O, and P2O5. A new way to obtain bioactive materials is through the low-temperature sol-gel method [1]. The most characteristic sol-gel-derived bioactive glass is the 58S which is a silica-based ternary glass, containing SiO2, CaO, and P2O5 [2]. The rate of surface bone-like hydroxyapatite (HA) formation for the 58S compositions was even more rapid than for melt-derived 45S5 bioglass [3]. This finding offered a potential processing method for molecular and textural tailoring of the biological behavior of a new, third generation of bioactive materials [3]. The study on sol-gel bioactive glasses showed that the in vitro bioactivity and degradation was affected by both chemical composition and structure, and various ions such as Na+ Mg2+, Zn2+, Al3+ were introduced into sol-gel glasses to modify the chemical composition and structure [4–7]. Sodium has been reported as network disrupting species in glasses [8]. Titanium is considered to be harmless in contact with human tissue, and it has ever been used as a nucleating agent in glasses [9]. Therefore, a suitable substitution of 58S sol-gel glass with Na or Ti may render it more adjustable in the biological properties. Up to now, few studies have been
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