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Search Results: 1 - 10 of 51 matches for " Linfang "
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Implementation of the No Packet Loss Network Communication in VxWorks
Linfang Zhang
Modern Applied Science , 2010, DOI: 10.5539/mas.v4n9p30
Abstract: By VxWorks, the real-time control system of certain equipment adopts the UDP/IP network communication, which requires that the control process has strong real-time character and complex task scheduling. In the work condition with frequently interactive network tasks, the control system is easy to lose packets, and to solve this problem, this article adopts the double-loop buffer structure processing mechanism to realize the no packet loss network communication method, which could largely enhance the reliability of the network communication and improve the stability of the control system. Based on the excellent multi-task scheduling ability of VxWorks, this method could essentially enhance the efficiency and reliability of software. By testing, this method is efficient and feasible.
Imaging Studies of Characteristics for a Slab of a Lossy Left-handed Material
Linfang Shen,Sailing He
Physics , 2003, DOI: 10.1016/S0375-9601(03)00168-3
Abstract: The characteristics of an imaging system formed by a slab of a lossy left-handed material (LHM) are studied. The transfer function of the LHM imaging system is written in an appropriate product form with each term having a clear physical interpretation. A tiny loss of the LHM may suppress the transmission of evanescent waves through the LHM slab and this is explained physically. An analytical expression for the resolution of the imaging system is derived. It is shown that it is impossible to make a subwavelength imaging by using a realistic LHM imaging system unless the LHM slab is much thinner than the wavelength.
Development of Roller Ends Forced-Contact Model and Cambering Technology for UCM Temper Mill (I)——Development of Roller Ends Forced-Contact Model and the Computational Model of Flatness for UCM temper mill  [PDF]
Zhenhua Bai, Hongxin Si, Xiaodong Shi, Linfang Han, Ruibing Long, Shoumin Wu, Xiujun Li, Dongdong Zhang
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.37088
Abstract: Roller ends forced-contact and overmuch roll consumption are the widespread problems in temper rolling process of thin strip for two-stand UCM temper mill. Fully thinking the equipment and technology characteristics of UCM temper mill, we took the newly-built 1220 UCM temper mill of Baosteel as the research object in this paper. A model of roller ends forced-contact and a calculation model of flatness for UCM temper mill are established after a great deal of site tracing and theoretical researches. On this basis, an optimal mathematical model of roll shape which is suited for UCM temper mill is developed. Working roll curve is the combination of cosine curve and high order curve. The cosine subentry is used to control edge wave, the high order curve subentry is used to control roller ends forced-contact. Furthermore, the chamfering curve of middle roller end is optimized. Those are the innovations. Through the above-mentioned technology, pressure distribution between rollers caused by the shift of middle roll becomes more homogeneous, pressure peak disappeared, working life of roll is improved effectively as well. Relevant technologies have been used to the practice of 1220 UCM temper mill of Baosteel and have achieved good use effects, which is of further extending application value [1].
Development of Roller Ends Forced-Contact Model and Cambering Technology for UCM Temper Mill (II)——Development of cambering technology for UCM temper mill  [PDF]
Zhenhua Bai, Xiaodong Shi, Hongxin Si, Linfang Han, Ruibing Long, Shoumin Wu, Xiujun Li, Dongdong Zhang
Engineering (ENG) , 2011, DOI: 10.4236/eng.2011.37089
Abstract: Roller ends forced-contact and overmuch roll consumption are the widespread problems in temper rolling process of thin strip for two-stand UCM temper mill. Fully thinking the equipment and technology characteristics of UCM temper mill, we took the newly-built 1220 UCM temper mill of Baosteel as the research object in this paper. A model of roller ends forced-contact and a calculation model of flatness for UCM temper mill are established after a great deal of site tracing and theoretical researches. On this basis, an optimal mathematical model of roll shape which is suited for UCM temper mill is developed. Working roll curve is the combination of cosine curve and high order curve. The cosine subentry is used to control edge wave, the high order curve subentry is used to control roller ends forced-contact. Furthermore, the chamfering curve of middle roller end is optimized. Those are the innovations. Through the above-mentioned technology, pressure distribution between rollers caused by the shift of middle roll becomes more homogeneous, pressure peak disappeared, working life of roll is improved effectively as well. Relevant technologies have been used to the practice of 1220 UCM temper mill of Baosteel and have achieved good use effects, which is of further extending application value.
Evaluation of GO-based functional similarity measures using S. cerevisiae protein interaction and expression profile data
Tao Xu, LinFang Du, Yan Zhou
BMC Bioinformatics , 2008, DOI: 10.1186/1471-2105-9-472
Abstract: In this study, we evaluated five functional similarity methods using both protein-protein interaction (PPI) and expression data of S. cerevisiae. The receiver operating characteristics (ROC) and correlation coefficient analysis of these methods showed that the maximum method outperformed the other methods. Statistical comparison of multiple- and single-term annotated proteins in biological process ontology indicated that genes with multiple GO terms may be more reliable for separating true positives from noise.This study demonstrated the reliability of current approaches that elevate the similarity of GO terms to the similarity of proteins. Suggestions for further improvements in functional similarity analysis are also provided.Gene ontology (GO) [1] describes gene products based on their functions and is a structured and controlled vocabulary that has become quite popular among the known taxonomies. The root ontology (ALL) of GO consists of three independent terms: biological process (BP), molecular function (MF), and cellular component (CC). GO data provides a novel way to measure the functional relationship between gene products, which is the basis of most gene correlation studies [2]. Researchers interested in functionally related genes always hope to improve the accuracy of the results beyond the boundaries of currently available experimental data. Addition of knowledge data, for example, by computing the semantic similarity between genes may partially address this problem. Most semantic-based applications follow a three-step approach that includes semantic similarity calculations of paired GO terms, functional similarity calculations of all possible combinations of related GO terms, and further studies such as clustering analysis [3-6]. However, optimization of the methods for elevating the similarity of GO terms to the similarity of proteins is still required.In semantic-based applications, it is necessary to compute the similarity among GO terms before inves
In memory of Professor Liviu Librescu
悼念Liviu Librescu教授

QIAN Linfang,
钱林方

力学与实践 , 2007,
Abstract: 2007年4月16日上午,从美国弗吉尼亚州的一个宁静而又美丽的小镇黑堡(Blacksberg)传出了一个震惊全世界的消息,位于该镇的弗吉尼亚理工大学校内发生了一起特大的枪杀案,造成33人(包括枪手本人)死亡, 28人受伤的惨剧,主案发现场就在 Norris Hall 大楼内.
RESEARCH ON THE EXPLOITATION OF RESERVED LAND RESOURCES IN THE YELLOW RIVER DELTA
黄河三角洲土地后备资源开发研究

Yang Linfang,
杨林芳

资源科学 , 1993,
Abstract: The recently-formed delta of the Yellow River is the region where there are the lowest rate of reclamation and the richest reserve land resources in shandong province. Beginning with the analysis of the features, suitability and exploitation benefit of reserve land resources in this region, some counter-measures and propo-sals for the rational exploitation of the reserved land resources in the future are given.
Dynamic Analysis of a Timoshenko Beam Subjected to an Accelerating Mass Using Spectral Element Method
Guangsong Chen,Linfang Qian,Qiang Yin
Shock and Vibration , 2014, DOI: 10.1155/2014/768209
Abstract: This paper presents formulations for a Timoshenko beam subjected to an accelerating mass using spectral element method in time domain (TSEM). Vertical displacement and bending rotation of the beam were interpolated by Lagrange polynomials supported on the Gauss-Lobatto-Legendre (GLL) points. By using GLL integration rule, the mass matrix was diagonal and the dynamic responses can be obtained efficiently and accurately. The results were compared with those obtained in the literature to verify the correctness. The variation of the vibration frequencies of the Timoshenko and moving mass system was researched. The effects of inertial force, centrifugal force, Coriolis force, and tangential force on a Timoshenko beam subjected to an accelerating mass were investigated. 1. Introduction Dynamic response of structures subjected to a moving force or moving mass is an important issue in engineering problems. For example, the trains have experienced great advances characterized by increasingly higher speeds and weights of vehicles. As a result, the dynamic response, as well as stresses, can be significantly higher than that before or static loads. The problem arose from the observations is a structure subjected to moving masses. Many researchers studied these problems and many studies are presented in the literatures. For examples, references [1–3] assuming the moving load to be a moving force have given some analytical solutions. Abu-Hilal [4] studied the dynamic response of a double Euler-Bernoulli beam due to a moving constant load. Fryba [5] extensively analyzed the solution of moving loads on structures. Rao [6] gave a detailed analysis of the vibration of a beam excited by a moving oscillator using a perturbation method. Zibdeh and Juma [7] presented the dynamic response of a rotating beam subjected to a random moving load using analytical and numerical methods. Akin and Mofid [8] investigated the dynamic behavior of Bernoulli-Euler beams carrying a moving mass with different boundary conditions using analytical-numerical method, and achievements by other researchers are presented in literatures [9–14]. The studies mentioned are based on Bernoulli-Euler beam, while the moment of inertia and shear deformation should be taken into account when ratio of the height to span is large. References [15–20] studied the dynamic response of Timoshenko beams subject to moving force. Ross [21] studied the problem of a viscoelastic Timoshenko beam subjected to a step-loading using the Laplace transform method. Katz et al. [22] solved the dynamic response of a rotating
Abnormal phenomena in a one-dimensional periodic structure containing left-handed materials
Liang Wu,Sailing He,Linfang Shen
Physics , 2002, DOI: 10.1103/PhysRevB.67.235103
Abstract: The explicit dispersion equation for a one-dimensional periodic structure with alternative layers of left-handed material (LHM) and right-handed material (RHM) is given and analyzed. Some abnormal phenomena such as spurious modes with complex frequencies, discrete modes and photon tunnelling modes are observed in the band structure. The existence of spurious modes with complex frequencies is a common problem in the calculation of the band structure for such a photonic crystal. Physical explanation and significance are given for the discrete modes (with real values of wave number) and photon tunnelling propagation modes (with imaginary wave numbers in a limited region).
Finite-size effects of a left-handed material slab on the image quality
Long Chen,Sailing He,Linfang Shen
Physics , 2003, DOI: 10.1103/PhysRevLett.92.107404
Abstract: The characteristics of an imaging system formed by a left-handed material (LHM) slab of finite length are studied, and the influence of the finite length of the slab on the image quality is analyzed. Unusual phenomena such as surface bright spots and negative energy stream at the image side are observed and explained as the cavity effects of surface plasmons excited by the evanescent components of the incident field. For a thin LHM slab, the cavity effects are found rather sensitive to the length of the slab, and the bright spots on the bottom surface of the slab may stretch to the image plane and degrade the image quality.
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