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Search Results: 1 - 10 of 78261 matches for " Dingyang Chen "
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Energy-Saving Technology in Indoor LTE System with DTX Based on CQI  [PDF]
Zhenyu Yang, Yong Shang, Dingyang Chen, Xiguang Zhang
Int'l J. of Communications, Network and System Sciences (IJCNS) , 2015, DOI: 10.4236/ijcns.2015.84006
Abstract:

In LTE (Long Term Evolution) system, CQI (Channel Quality Indication) is a technical method to realize adaptive modulation and coding. The dispatcher of BS (base station) would allocate resource blocks to users dynamically based on CQI of uplink and downlink channels, which is necessary in the process of uplink and downlink transmission [1]. When the CQI level of the channel is high, the energy efficiency is high. On the contrary, when the CQI level of the channel is low, the energy efficiency is low. However, if signals are not transmitted until the quality of the channel is good, energy loss may be lowered in the expense of group delay. That is to say, we take CQI into account on the basis of the technology of DTX [2] [3] (Discontinuous Transmission). According to the result of simulation, the energy consumption can be reduced by using our proposed scheme. Particularly, the energy-saving effect is significant when the load is low.

PULL-INDUCED PHASE TRANSITION IN COMPACT CHAINS
拉力诱导下的紧密高分子链相变行为

MA Dingyang,ZHANG Linxi,
马定洋
,章林溪

高分子学报 , 2008,
Abstract: 采用相互作用自回避行走(interacting self-avoiding walks,ISAWS)模型研究了一端固定的紧密高分子链在拉伸过程中的低温相变行为,观察到在拉伸过程中当温度T<0.1时平均拉力会出现一个震荡,随着温度的升高这种震荡现象又渐渐消失,这是由于紧密高分子链在低温时类似于β折叠的"冻结构象"被拉开而引起的.比较吸附条件下和无吸附作用下平均拉力、自由能以及相变行为的差别,发现在吸附条件下在拉伸的初始阶段为了克服表面吸附的相互作用,拉力会出现一个峰.吸附作用也使得外界作用到高分子链上的实际有效拉力减小,造成崩塌相态(collapsed phase)区域面积减少.另外发现在吸附条件下平均拉力还受温度变化的影响.在拉伸的初期由于单体间存在体积排除效应,平均拉力是随着温度的升高而降低,随着拉伸的深入当末端距到达一定长度时平均拉力是随着温度的升高而增加.并同Kumar等人在不考虑吸附作用下拉伸紧密高分子链得到的结果进行了比较.这些研究对于进一步研究外力诱导下吸附紧密高分子的相变有一定的参考价值.
A Steered Molecular Dynamics Study on Elastic Behavior of Polyethylene Chains
拉伸分子动力学方法研究聚乙烯单链的力学行为

MA Dingyang,ZHANG Linxi,
马定洋
,章林溪

高分子学报 , 2008,
Abstract: 采用拉伸分子动力学方法(steered molecular dynamics,SMD)研究一端固定的聚乙烯单链(singlepolyethylene chain)在被拉伸过程中的力学性质.在拉伸过程中发现平均拉力〈f〉受拉伸速度v的影响,当v<0.05 nm/ps时,〈f〉在250 pN附近会出现一个拉力平台.聚乙烯单链各部分的形状因子在拉伸过程中表现出一定的规律性,总是头部和尾部的形状因子〈δh〉、〈tδ〉先增加然后才是中间部分〈δm〉增加.如果按顺序再释放被拉开的聚乙烯单链,就会出现力学回滞现象,这与Kellermayer等的力学回滞曲线实验是一致的.力学回滞曲线面积表示耗散能〈Ed〉,与速度v满足方程〈Ed〉=a b×e-cv,而且在v<0.005 nm/ps和v>0.005 nm/ps两个速度区域有不同的特性.〈Ed〉在不同的分子热运动温度区域,也表现出不同的规律性,当温度T>220 K时,〈Ed〉随着温度T的升高而减小,这与Pegoretti等的实验一致,当T<220 K时〈Ed〉随着温度T的升高而增加.
成年女性舌骨位置与牙颌面相关指标的三维分析
Three-dimensional analysis of the hyoid bone position in the dental and maxillofacial complex in adult women

李丁洋,曹闪闪,郭泾
LI Dingyang
, CAO Shanshan, GUO Jing

- , 2018, DOI: 10.6040/j.issn.1671-7554.0.2018.024
Abstract:
颞叶内侧癫痫手术治疗:前颞叶切除术与选择性杏仁核海马切除术
Clinical outcomes after medial temporal lobe epilepsy surgery: Anterior temporal lobectomy versus selective amygdalohippocampectomy

王承雄, ,刘定阳,杨治权,杨转移
WANG Chengxiong
, , LIU Dingyang, YANG Zhiquan, YANG Zhuanyi

- , 2018, DOI: 10.11817/j.issn.1672-7347.2018.06.010
Abstract: 目的:比较前颞叶切除术(anterior temporal lobectomy,ATL)与经侧裂选择性杏仁核海马切除术(selective amygdalohippocampectomy,SeAH)治疗颞叶内侧癫痫(medial temporal lobe epilepsy,MTLE)在控制癫痫发作和改善神经 心理学结果方面的疗效。方法:回顾性分析SeAH(39例)和ATL(33例)治疗的72例MTLE患者的临床资料和随访资料。 临床心理评估采用Wechsler成人智力量表和Wechsler记忆量表。结果:72例患者中59例(81.9%)获得满意的癫痫控制 (62.5% Class I和19.4% Class II)。ATL组癫痫控制满意28例(84.8%),SeAH组满意31例(79.5%),两者之间差异无统计学意 义(P=0.76)。SeAH组左侧和右侧手术术后语言IQ评分均明显增加(P<0.05),而ATL组左侧和右侧手术后语言IQ评分增 加无统计学意义(P>0.05);左侧SeAH手术后语言记忆和总记忆评分显著增加(P<0.05),但是左侧ATL手术后语言记 忆、非语言记忆、总记忆评分增加无统计学意义(P>0.05);右侧手术两种术式的手术后语言记忆和总记忆评分显著增 加,非语言记忆评分增加无统计意义(P>0.05)。结论:ATL与SeAH是治疗MTLE的有效安全的方法,ATL与SeAH两种 术式对癫痫控制无明显差异,但对术后语言智商和语言记忆而言,在优势半球侧手术时SeAH优于ATL
SSub-zoning in Rural Residential Land Consolidation in Taian City
泰安市农村居民点整理分区研究

ZHOU Dingyang,AN Pingli,JIANG Guanghui,FU Haiying,HONG Lei,XUE Cuicui,
周丁扬
,安萍莉,姜广辉,付海英,洪磊,薛翠翠

资源科学 , 2011,
Abstract: 根据实地调查了解各区农村居民点的用地现状及整理进程,明确各待整理区的类型与发展方向,制定符合实际的整理模式和时序,可为土地整理科学决策提供依据。本文采用实地调查、多因素综合评价及K均值聚类法,对泰安市农村居民整理分区的整理模式及潜力进行了研究。结果表明:全市可供整理的闲置农村居民点用地共1 0875hm2;紧靠城市边缘的农村居民点可通过城市化过程最先整理;城市控制区内的整理相对容易且潜力大,重点应通过拓宽整理资金的融资渠道加速其进程;城市内部村庄整理难度最大;地处农村腹地和经济状况较差的村庄,应以培育为主、整理为辅。本文分区及潜力测算基于实地调查,突出了测算城市区域内部空间的共性和差异性,分区结果具有现实可行性,所划农村居民点整理区内居民点空间结构调整方向明确,具有现实指导意义。
Research on the Incentive Mechanism of Hidilao Hotpot’s Employees Based on Grounded Theory  [PDF]
Chen Chen
Journal of Human Resource and Sustainability Studies (JHRSS) , 2018, DOI: 10.4236/jhrss.2018.61031
Abstract: The traditional classical incentive model only reveals the general rule of organizational incentive, and does not give specific operation rules. The matching between organizational incentives and employee needs is still black box, and it does not reveal its core operation mechanism from the perspective of mechanism. This paper took through the literature review, the Hidilao Hotpot company as a case study, through a variety of ways to collect data, the use of grounded theory to encode data analysis, and ultimately extracted 58 concepts, 26 sub-areas, 7 main areas, concluded that the Hidilao Hotpot Employee motivation formed the path, and ultimately extracted the micro-level employee motivation mechanism model. The research result of this article comes from the practice of the enterprise, which has enlightenment to the organizational incentive of the traditional catering industry and also provides a micro-research perspective and systematic mechanism research for the incentive field.
Digital Image Watermarking Based on Mixed Error Correcting Code  [PDF]
Yonghong Chen, Jiancong Chen
Journal of Information Security (JIS) , 2012, DOI: 10.4236/jis.2012.32018
Abstract: In this paper, we present a novel technique based on a mixed Error Correcting Code(ECC)-the convolutional code and the repetition code to enhance the robustness of the embedded watermark. Before embedding, the binary watermark is scanned to one-dimension sequence and later inputted into the (3, 1, 2) convolutional encoder and (3, 1) repetition encoder frame by frame, which will improve the error correcting capability of decoder. The output code sequence is scanned to some matrixes as the new watermark messages. The watermarking is selected in low frequency band of the Discrete Wavelet Transform (DWT) and therefore it can resist the destruction of image processing. Experimental results are presented to demonstrate that the robustness of a watermark with mixed ECC is much higher than the traditional one just with repetition coding while suffering JPEG lossy compression, salt and pepper noise and center cutting processing.
Operator Equation and Application of Variation Iterative Method  [PDF]
Ning Chen, Jiqian Chen
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.38127
Abstract: In this paper, we study some semi-closed 1-set-contractive operators A and investigate the boundary conditions under which the topological degrees of 1-set contractive fields, deg (I-A, Ω, p) are equal to 1. Correspondingly, we can obtain some new fixed point theorems for 1-set-contractive operators which extend and improve many famous theorems such as the Leray-Schauder theorem, and operator equation, etc. Lemma 2.1 generalizes the famous theorem. The calculation of topological degrees and index are important things, which combine the existence of solution of for integration and differential equation and or approximation by iteration technique. So, we apply the effective modification of He’s variation iteration method to solve some nonlinear and linear equations are proceed to examine some a class of integral-differential equations, to illustrate the effectiveness and convenience of this method.
Blow-Up and Attractor of Solution for Problems of Nonlinear Schrodinger Equations  [PDF]
Ning Chen, Jiqian Chen
Applied Mathematics (AM) , 2012, DOI: 10.4236/am.2012.312263
Abstract: In this paper, the authors study the blow-up of solution for a class of nonlinear Schrodinger equation for some initial boundary problem. On the other hand, the authors give out some analyses and that new conclusion by Eigen-function method. In last section, the authors check the nonlinear parameter for light rule power by using of parameter method to get ground state and excite state correspond case, and discuss the global attractor of some fraction order case, and combine numerical test. To illustrate this physics meaning in dimension d = 1, 2 case. So, by numerable solution to give out these wave expression.
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