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Research on the Dark Stripes Extraction Algorithm for Measuring Diameter with Diffraction  [PDF]
Quan Liu, Fenglin Wei
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.32B013
Abstract:

The optical diffraction is a major means of minute diameter measurements. Since the light intensity of the diffraction fringe, mainly distributed in the central bright stripes, and that will lead to a relatively low SNR for the signal of the senior stripes. The traditional dark stripes extraction algorithm affected greatly by the noise. So this paper presents an algorithm that could effectively eliminate the gross errorcaused by the noise. Than by curve fitting the local signal of the diffraction pattern with the least square principle, the system could achieve a high measurement precision.

Role of optical spectroscopy using endogenous contrasts in clinical cancer diagnosis
Quan Liu
World Journal of Clinical Oncology , 2011,
Abstract: Optical spectroscopy has been intensively studied for cancer management in the past two decades. This review paper first introduces the background of optical spectroscopy for cancer management, which includes the advantages of optical techniques compared to other established techniques, the principle of optical spectroscopy and the typical setup of instrumentation. Then the recent progress in optical spectroscopy for cancer diagnosis in the following organs is reviewed: the brain, breast, cervix, lung, stomach, colon, prostate and the skin. Reviewed papers were selected from the PubMed database with keywords combining the terms of individual optical spectroscopy techniques and cancers. The primary focus is on the in vivo applications of optical spectroscopy in clinical studies. Ex vivo studies are also included for some organs to highlight special applications or when there are few in vivo results in the literature. Practical considerations of applying optical spectroscopy in clinical settings such as the speed, cost, complexity of operation, accuracy and clinical value are discussed. A few commercially available clinical instruments that are based on optical spectroscopy techniques are presented. Finally several technical challenges and standard issues are discussed and firm conclusions are made.
The Application of the Item Response Theory in China’s Public Opinion Survey Design
Quan LIU,Ting LIU
Management Science and Engineering , 2011, DOI: 10.3968/j.mse.1913035x20110503.1z242
Abstract: In this paper, we use the item response theory (IRT), take the public opinion poll questionnaire survey design as main lines, combine college campus life satisfaction survey, discuss the basic principle of IRT public opinion poll questionnaire survey design systematically and research key technology and method of the process specifications, survey topic choice, scheme configuration, error control and satisfaction standards definition of the public opinion poll questionnaire survey design. Studies show that this theory and method overcomes the problem, which the public opinion poll questionnaire survey design under classical test theory (CTT) can not solve it and IRT may improve the quality of the public opinion poll questionnaire survey design. Key words: The public opinion poll survey; Questionnaire design; IRT; Survey technology research
An Agent-Based Multimedia Intelligent Platform for Collaborative Design  [PDF]
Quan LIU, Xingran CUI, Xiuyin HU
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2008, DOI: 10.4236/ijcns.2008.13032
Abstract: Collaborative design can create added value in the design and production process by bringing the benefit of team work and cooperation in a concurrent and coordinated manner. However, distributed design knowledge and product data make the design process cumbersome. To facilitate collaborative design, an agent-based intelligent CAD platform is implemented. Intelligent agents are applied to the collaborative design. Adopting the JADE platform as framework, an intelligent collaborative design software (Co-Cad platform for short) is designed. In this platform, every man, design software, management software, equipment and resource is regarded as a single agent, the legacy design can be abstracted to be interaction between agents. Multimedia technology is integrated into Co-Cad platform, communication and identity authentication among collaborative designers from different areas are more convenient. Finally, an instance of collaborative design using Co-Cad platform is presented.
Lever-Loading System Analysis and Application  [PDF]
Bingli Liu, Bo Zang, Hongbiao Quan
Modern Mechanical Engineering (MME) , 2013, DOI: 10.4236/mme.2013.31008
Abstract:

In order to prove the rationality of structural design and carrying capacity, reasonable design of lever-loading system to apply loadings to some loading-points was needed in spacecraft structural mechanics static test. Lever-loading system design affects the carrying capacity of test piece. This paper describes the application of different section loading beams. Optimizing and analysis the different models of loading beams, and verification the feasibility of combination beams.

Resonant Behavior Measurements and Two-Dimensional Imaging of Small Conducting Spheres in Catr
Shaohui Quan;Qinghui Liu
PIER C , 2009, DOI: 10.2528/PIERC09073101
Abstract: Based on swept frequency RCS measurements system, foam column and proper data processing procedure, the resonance curves of conducting spheres with RCS below -32.95 dBsm are achieved in a single reflector Compact Antenna Test Range (CATR), with measurement errors within 1.0 dB over most of the measurement frequencies. Nine spheres down to -49.01 dBsm are clearly imaged with Range-Doppler (R-D) method and pointwise vector background subtraction technique.
Research on Fine-grained Job scheduling in Grid Computing
Yeqing Liao,Quan Liu
International Journal of Information Engineering and Electronic Business , 2009,
Abstract: Grid computing is the technology used in building Internet-wide computing environment and integrating distributed and heterogeneous resources. However, in Grid environment, job scheduling is confronted with a great challenge. This paper focuses on lightweight jobs scheduling in Grid Computing. An Adaptive Fine-grained Job Scheduling (AFJS) algorithm is proposed. Compared with other fine-grained job scheduling algorithms based on grouping, AFJS can outperform them according to the experimental results. And some other related problems are also illustrated.
Coordinated Motion Control of Autonomous and Semiautonomous Mobile Agents
Qing-Quan Liu
TELKOMNIKA : Indonesian Journal of Electrical Engineering , 2012, DOI: 10.11591/telkomnika.v10i8.1192
Abstract: This paper addresses networked control problems which arise in the coordinated motion control of autonomous and semiautonomous mobile agents, where the sensors and controllers are geographically separated and connected by digital communication channels carrying a finite number of bits per unit time. Different from the existing results, this case with quantized output measurements and limited data rates is considered. A quantization, coding and control scheme is presented under communication constraints. In particular, it is shown that the unstable plant may be stabilizable in the mean square sense if the data rate of the channel is greater than the lower bound proposed in our results. Simulation results show the validity of the proposed scheme.
Steady State Equilibrium Condition of $npe^{\pm}$ Gas and Its Application to Astrophysics
Men-Quan Liu
Physics , 2010, DOI: 10.1088/1674-4527/11/1/005
Abstract: The steady equilibrium conditions for a mixed gas of neutrons, protons, electrons, positrons and radiation field (abbreviated as $npe^{\pm}$ gas) with/without external neutrino flux are investigated, and a general chemical potential equilibrium equation $\mu_n=\mu_p+C\mu_e$ is obtained to describe the steady equilibrium at high temperatures ($T>10^9$K). An analytic fitting formula of coefficient $C$ is presented for the sake of simplicity as the neutrino and antineutrino are transparent. It is a simple method to estimate the electron fraction for the steady equilibrium $npe^{\pm}$ gas that using the corresponding equilibrium condition. As an example, we apply this method to the GRB accretion disk and approve the composition in the inner region is approximate equilibrium as the accretion rate is low. For the case with external neutrino flux, we calculate the initial electron fraction of neutrino-driven wind from proto-neutron star model M15-l1-r1. The results show that the improved equilibrium condition makes the electron fraction decrease significantly than the case $\mu_n=\mu_p+\mu_e$ when the time is less than 5 seconds post bounce, which may be useful for the r-process nucleosynthesis
The Thomas-Fermi Quark Model: Non-Relativistic Aspects
Quan Liu,Walter Wilcox
Physics , 2012,
Abstract: The first numerical investigation of non-relativistic aspects of the Thomas-Fermi (TF) statistical multi-quark model is given. We begin with a review of the traditional TF model without an explicit spin interaction and find that the spin splittings are too small in this approach. An explicit spin interaction is then introduced which entails the definition of a generalized spin "flavor". We investigate baryonic states in this approach which can be described with two inequivalent wave functions; such states can however apply to multiple degenerate flavors. We find that the model requires a spatial separation of quark flavors, even if completely degenerate. Although the TF model is designed to investigate the possibility of many-quark states, we find surprisingly that it may be used to fit the low energy spectrum of almost all ground state octet and decuplet baryons. The charge radii of such states are determined and compared with lattice calculations and other models. The low energy fit obtained allows us to extrapolate to the six-quark doubly strange {\it H}-dibaryon state, flavor symmetric strange states of higher quark content and possible six quark nucleon-nucleon resonances. The emphasis here is on the {\it systematics} revealed in this approach. We view our model as a versatile and convenient tool for quickly assessing the characteristics of new, possibly bound, particle states of higher quark number content.
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