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Search Results: 1 - 10 of 11720 matches for " Wuling Qin "
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Dropping Rate Simulation for a Handover Scheme Using Importance Sampling  [PDF]
Dong Liang, Gan Ding, Wuling Qin, Mugen Peng
Communications and Network (CN) , 2013, DOI: 10.4236/cn.2013.53B2078

The process of changing the channel associated with the current connection while a call is in progress is under consideration. The estimation of dropping rate in handover process of a one dimensional traffic system is discussed. To reduce the sample size of simulation, dropping calls at base station is considered as rare event and simulated with importance sampling - one of rare event simulation approaches. The simulation results suggest the sample size can be tremendously reduced by using importance sampling.

A Localization Algorithm Based On SFLA and PSO for Wireless Sensor Network
Wuling Ren,Cuiwen Zhao
Information Technology Journal , 2013,
Abstract: With the rapid development of wireless sensor networks, the localization algorithms have drawn more attention by researchers. Due to the network cost and the restricted energy of the sensor nodes, most of the localization algorithms are not well suitable for wireless sensor networks and furthermore the positioning accuracy is relatively low. The paper presents a localization algorithm based on Shuffled Frog Leaping Algorithm (SFLA) and Particle Swarm Optimization (PSO). Firstly, a calculation method of average distance per hop was designed by using the shuffled frog leaping algorithm which makes the average distance per hop closer to the actual value. Secondly, we consider the location problem as an optimization process to obtain the position of the unknown nodes positioning using particle swarm optimization algorithm which further precise unknown nodes positions. The simulation results have shown that the proposed location algorithm has a higher accuracy.
A General Approach for Orthogonal 4-Tap Integer Multiwavelet Transforms
Mingli Jing,Hua Huang,Wuling Liu,Chun Qi
Mathematical Problems in Engineering , 2010, DOI: 10.1155/2010/163758
Abstract: An algorithm for orthogonal 4-tap integer multiwavelet transforms is proposed. We compute the singular value decomposition (SVD) of block recursive matrices of transform matrix, and then transform matrix can be rewritten in a product of two block diagonal matrices and a permutation matrix. Furthermore, we factorize the block matrix of block diagonal matrices into triangular elementary reversible matrices (TERMs), which map integers to integers by rounding arithmetic. The cost of factorizing block matrix into TERMs does not increase with the increase of the dimension of transform matrix, and the proposed algorithm is in-place calculation and without allocating auxiliary memory. Examples of integer multiwavelet transform using DGHM and CL are given, which verify that the proposed algorithm is an executable algorithm and outperforms the existing algorithm for orthogonal 4-tap integer multiwavelet transform.

Chen Wuling,Yang Xiaoyan,Yao Shengli,

光子学报 , 1998,
Abstract: The effects of mutation on the spora and protoplast of strepfomyces erythreus were studied by He Ne laser.High yielding strain of erythromycin was also obtained,which increase the unit of fermentation by about 27 2% higher than that of the control.And the esterase isoenzyme patterns of mutants were also studied by polyacrolamide gel electrophoresis.
Color Filtering Localization for Three-Dimensional Underwater Acoustic Sensor Networks
Zhihua Liu,Han Gao,Wuling Wang,Shuai Chang,Jiaxing Chen
Computer Science , 2014,
Abstract: Accurate localization for mobile nodes has been an important and fundamental problem in underwater acoustic sensor networks (UASNs). The detection information returned from a mobile node is meaningful only if its location is known. In this paper, we propose two localization algorithms based on color filtering technology called PCFL and ACFL. PCFL and ACFL aim at collaboratively accomplishing accurate localization of underwater mobile nodes with minimum energy expenditure. They both adopt the overlapping signal region of task anchors which can communicate with the mobile node directly as the current sampling area. PCFL employs the projected distances between each of the task projections and the mobile node, while ACFL adopts the direct distance between each of the task anchors and the mobile node. Also the proportion factor of distance is proposed to weight the RGB values. By comparing the nearness degrees of the RGB sequences between the samples and the mobile node, samples can be filtered out. And the normalized nearness degrees are considered as the weighted standards to calculate coordinates of the mobile nodes. The simulation results show that the proposed methods have excellent localization performance and can timely localize the mobile node. The average localization error of PCFL can decline by about 30.4% than the AFLA method.
Fmoc Solid-phase Synthesis of Cyclopeptide FIK

Junjun Zhang,Wei Shi,Wuling Chen,

生物工程学报 , 2008,
Abstract: We study the techniques of synthesis of disulfide bond-bearing cyclopeptides FIK. This experimentation with the material of Fmoc-aa use Solid-Phase synthesis after condensation by HBTU/HOBt/DIEA to synthesize linear peptide, then cyclopeptide was synthesized by creation of intramolecular disulfide bond by means of 12 oxidation of bis cysteine sulfhydryl of the linear peptide. The crude production was cleaved from the resin together with all protecting group and identified and separated by MALDI-MS and RP-HPLC. The peptide yield was 18%, after purification the purity was more than 97%. It was identified on MALDI-MS and Ellman reagent detection. This method is effective, simple, rapid and obtained good yield, and it's fit for the large-scale production.
Fmoc Solid-phase Synthesis of Cyclopeptide FIK

Junjun Zhang,Wei Shi,Wuling Chen,

微生物学报 , 2008,
Abstract: 为研究二硫键成环的杂环肽FIK的合成工艺, 以Fmoc氨基酸为原料, 采用固相合成法, 经TBTU/HOBT/DIEA复合缩合剂催化合成直链肽, 再经I2氧化肽链上两个半胱氨酸的巯基生成分子内二硫键而得到目标环肽, 将其用切割试剂切割脱离树脂得到粗产品, MALDI-MS和RP-HPLC进行鉴定, 分析和纯化。产率可以达到18%, 纯化后纯度达97%以上, 经MALDI-MS和Ellman试剂检测确定为目标肽。该合成法高效, 简便, 快速, 目标肽收到较理想产率, 适合大批量生产。
Numercial simulation of the process of desulfurization and dechloriantion in a flue gas quench tower

Sheng Kai,Liu Wuling,Xun Xin,

环境工程学报 , 2010,
Abstract: 以FLUENT为计算工具,通过数值模拟的方法,研究了烟气急冷塔内的浆滴干燥、脱硫脱氯过程。塔内烟气流场分布的数值模拟以标准k-ε方程为基础,石灰浆滴的运动轨迹跟踪采用拉格朗日离散相模型。建立烟气冷却净化模型研究塔内气液两相之间的相间作用,通过模拟,最终得到急冷塔流场、温度场以及相关组分场的分布情况。模拟结果表明,计算得到的脱酸效率与实际情况吻合。该模型可以为急冷塔的设计和运行提供参考。
The Application of Organica Ecological Technology in Residential Sewage Treatment  [PDF]
Yuje Qin
Journal of Environmental Protection (JEP) , 2013, DOI: 10.4236/jep.2013.41B006
Abstract: Water is the basis in ecological residential area. It is very important to recycle the water resource in the designing and planning of the ecological residential quarter due to the critical way to realize the wastewater resource utilization. In this paper, a new technology of wastewater treatment is introduced, which is ORGANICA ecotechnology. We integrate the traditional wastewater treatment technology and modern ecological engineering technology together and apply the integrated technology in the treatment of domestic sewage. The treated water can be reused for landscape and greening, which can beautify the residential area and recycle wastewater.
Steady-State Behavior of Semiconductor Laser Diodes Subject to Arbitrary Levels of External Optical Feedback  [PDF]
Qin Zou
Optics and Photonics Journal (OPJ) , 2013, DOI: 10.4236/opj.2013.31021

This paper investigates the steady-state behavior of a semiconductor laser subject to arbitrary levels of external optical feedback by means of an iterative travelling-wave (ITW) model. Analytical expressions are developed based on an iterative equation. We show that, as in good agreement with previous work, in the weak-feedback regime of operation except for a phase shift the ITW model will be simplified to the Lang-Kobayashi (LK) model, and that in the case where this phase shift is equal to zero the ITW model is identical to the LK model. The present work is of use in particular for distinguishing the coherence-collapse regime from the strong-feedback regime where low-intensity-noise and narrow-linewidth laser operation would be possible at high feedback levels with re-stabilization of the compound laser system.

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