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Search Results: 1 - 10 of 326756 matches for " 徐朗<br>CHENG Xi "
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考虑利他偏好的低碳供应链决策
Decision-making in low-carbon supply chain considering altruism preference

程茜,汪传旭,<br>CHENG Xi, WANG Chuan-xu, XU Lang
- , 2018, DOI: 10.6040/j.issn.1671-9352.0.2017.267
Abstract: 摘要: 为研究供应链成员的利他偏好属性对低碳供应链决策和利润的影响,考虑由单一制造商和单一零售商组成的两级供应链,分别建立了完全自利、零售商具有利他偏好和制造商具有利他偏好下的低碳供应链决策模型,进一步分析了利他偏好和企业社会责任承担效应对利润的影响。结果表明,只有利他偏好系数较小的零售商才会愿意与完全自利型的制造商合作,无论是零售商还是制造商具有利他偏好,制造商均会提高碳减排率和社会责任绩效水平。此外,利他偏好属性可以实现利他效应,但无法实现利他利己的双重效应;而社会责任承担效应对利润的影响取决于利他偏好属性。
Abstract: To analyze the effect of altruism behavior of supply chain members on decision-making and profits of low-carbon supply chain, a two stage supply chain consisting of one manufacturer and one retailer was considered. We developed decision-making models under completely selfish preference, retailers’ altruism and manufacturers’ altruism and analyzed the impacts of altruism preferences and social responsibility effect on profits. It is shown that when the altruistic preferences of retailer is low enough, retailer is willing to cooperate with the selfish manufacturers. Either manufacturers or retailers are altruistic, manufacturers will invest in emission reduction and social responsibility so as to improve the rate of carbon reduction and the level of social responsibility performance. In addition, it can be found that altruism behavior of supply chain members can lead to altruism effect, but can not achieve the dual effects of altruism; and the impact of social responsibility on profits depends on the altruism preference
The Estimation of Slow Time-Varying Frequency-Selective MIMO Wireless Channel Based on Harmonic Retrieval of Vector Sequence
基于向量序列谐波恢复的缓时变频率选择性MIMO无线信道的估计方法

Zhang Wei-jiong,Zhou Xi-lang,Xu Chang-qing,<br>张唯炯,周希,昌庆
电子与信息学报 , 2009,
Abstract: This paper studies the estimation of slow time-varying frequency-selective MIMO wireless channel, which is described by the parameter of harmonic fitting model and presents a method of channel estimation based on harmonic retrieval of vector sequence and LS method with nonlinear constraints using training sequence. The method applied in this paper uses the identic sequence instead of chirp sequence. The simulation shows that this method has more simple training sequence and better estimation performance with same SNR in contrast to the method applying chirp sequence as training signals.
Cluster Method of Support Vector Machine to Solve Large-scale Data Set Classification
一种聚簇消减大规模数据的支持向量分类算法

CHEN Guang-xi,XU Jian,CHENG Yan,<br>陈光喜,,成彦
计算机科学 , 2009,
Abstract: A cluster Support Vector Machines (C-SVM) method for large-scale data set classification was presented to accelerate speed.Firstly,using function of centre distance calculated radius ratio.Then,data set was scanned by cluster mirror.By remaining representative data for cluster and installing deleted matrix sample set was remarkably reduced.It is proved that the new method has lower time complexity.Experiments with random data and UCI databases verify the efficiency of the C-SVM.Moreover,classification accur...
Effect of CA storage on active oxygen metabolism in Chinese bayberry fruit
充氮贮藏对杨梅采后活性氧代谢的影响

XI Yu-fang,LUO Zi-sheng,CHENG Du,XU Cheng,WANG Yi-guang,<br>席芳,罗自生,程度,,王益光
浙江大学学报(农业与生命科学版) , 2001,
Abstract: Chinese Bayberry Fruit storaged in 85% N2 delayed the activities declination of Superoxide dismutase(SOD)、Ascorbate peroxidase(APX) and Glutathione reductase(GR) and maintained them at high level . Not only Malondialdehyde(MDA) was hold in a low level, but also the producing rate of active oxygen product rate was inhibited.
Numerical Simulation of Isothermal Chemical Vapor Infiltration Process for Fabrication of C/SiC Composites
C/SiC复合材料等温化学气相浸渗过程的数值模拟研究

WEI Xi,CHENG Lai-Fei,ZHANG Li-Tong,XU Yong-Dong,<br>魏玺,成来飞,张立同,永东
无机材料学报 , 2006,
Abstract: The multi-scale porosity model depicting infiltration induced changes of carbon fiber preform and the mathematical model depicting ICVI process for fabrication of C/SiC composites were developed. The integrated model was proposed to simulate densification behavior of C/SiC composites. The correspondences of calculation results and the experimental data indicate that the model is reasonable and feasible to characterize ICVI process of C/SiC composites. The calculated results, such as distribution of local porosity, uniformity of densification and evolution of global porosity during infiltration process, lay foundation of further research and optimization of ICVI process for fabrication of C/SiC composites.
Mapping Knowledge of Spatial Data Mining
空间数据挖掘知识的地图可视化表达*

WANG Zuo-cheng,XUE Li-xi,LI Yong-shu,XU Jing-hua,<br>王佐成,薛丽霞,李永树,京华
计算机应用研究 , 2006,
Abstract: This paper proposes that map is the proper visual method of spatial knowledge or rules from spatial data mining. Map can represent static and dynamic things, from the point of view of map expressing, spatial knowledge or rules from spatial data mining can be classified three categories, spatial characteristic rules, spatial relation rules and temporal and spatial evolution rules. The visual representing method for each category is proposed by virtue of maps.
Tourism Resource Population:Conception,Spatial Structure,Exploiting Potentiality:A Case Study of the Han Buddhism Temple Tourism Resource
旅游资源群:概念特征、空间结构、开发潜力研究

XI Jian-chao,GE Quan-sheng,CHENG Sheng-kui,XU Ji,|tian,<br>席建超,葛全胜,成升魁,继填
资源科学 , 2004,
Abstract: Tourism resource population refers to the aggregation of similar tourism resource occupying certain geographical areas and it is the basic element of regional tourism resource system. The concept of tourism resource group is enlightened by the concept of population in ecological system, which has special characteristics comparing with the individual tourism resource. It includes three characteristics as quantity,space and time. The studies on tourism on population scale are based on the assumption that the spatial arrangement of elements of tourism resource has special implications. The paper measures the spatial pattern of tourism resource population by GIS technology. Furthermore, the index of potentiality of regional tourism resource exploitation is put forward and the tourism resource population of Buddhism temple is analyzed. this study is expected useful not only to the practice of tourism resource management,but also to the development of the whole population of tourism resource.
TWO-STEP S THOMPSON-FDTD METHOD
Thompson-FDTD方法中的两步法

Liao Cheng,Ren Lang,<br>廖成,
电子与信息学报 , 1998,
Abstract: This paper combines the differential-Thompson transformation involved in hydromechanics with the finite difference time domain (FDTD) technique to form Thompson-FDTD method. This method is applied for the first time to calculate the electromagnetic scattering properties of arbitrarily shaped dielectric objects. This method has at least two obvious advantages: it can transform arbitrary shaped bodies into regular structures and thus the boundary conditions are matched accurately; it can wilfully dispose the grid distribution and thus better numerical accuracy is achieved. The numerical simulation further confirms its validity.
Weighting-Attribute Analysis for Engineering Option Selection
工程方案选择的权重-属性决策分析方法

Cheng Shengtong,Gao Lang,<br>程声通,
环境科学 , 2000,
Abstract: Option selection for engineering projects is a strategic decision making problem.Three key elements,objectives,weightings and attributes were proposed in the paper according to the cognition principle.The objective system establishment,the weighting survey and the attributes analysis were discussed in the paper.The methodology for option ranking was proposed.A case study were introduced to expound application of the weighting attributes analysis method.
Generating Combinations by Three Basic Operations
Yong-xi Cheng,<br>Yongxi,Cheng
计算机科学技术学报 , 2007,
Abstract: We investigate the problem of listing combinations using a special class of operations, prefix shifts. Combinations are represented as bitstrings of 0's and 1's, and prefix shifts are the operations of rotating some prefix of a bitstring by one position to left or right. We give a negative answer to an open problem asked by F. Ruskey and A. Williams (Generating combinations by prefix shifts, In Proc. 11th Annual International Computing and Combinatorics Conference 2005, LNCS 3595, Springer, 2005, pp.570–576), that is whether we can generate combinations by only using three very basic prefix shifts on bitstrings, which are transposition of the first two bits and the rotation of the entire bitstring by one position in either direction (i.e., applying the permutations σ2, σ n and σ n 1 to the indices of the bitstrings). Electronic Supplementary Material The online version of this article (doi:) contains supplementary material, which is available to authorized users. This work is supported in part by the National Natural Science Foundation of China under Grant No. 60553001 and the National Grand Fundamental Research 973 Program of China under Grant Nos. 2007CB807900 and 2007CB807901.
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