自适应干扰抵消系统的双边带调幅干扰抵消特性

根据系统模型给出了自适应干扰抵消系统针对双边带调幅制干扰时的稳态权值表达式,推导出干扰抵消比计算式,分析了影响干扰抵消效果的因素及其作用规律,并给出了提高干扰抵消比的设计思路和方法。对于双边带调幅制信号,通过提高系统增益来提高干扰抵消比,将受到信号带宽和等效传输延迟距离的制约。信号带宽越宽或等效传输延迟距离越大,通过增大增益所能实现的干扰抵消比提高越有限。对于一定的信号带宽,可以通过增益和等效传输延迟距离的联合设计来提高干扰抵消比。仿真结果验证了理论分析的正确性和可行性。     

基于熵权-双基点研制技术风险评估方法研究

分析了装备研制技术风险的含义,根据技术风险的特点建立了方案论证阶段评价技术风险的指标体系。在技术风险综合评价中引入熵理论确定各评价指标的权重,克服了传统评价方法中主观确定权重的缺陷,并通过实例验证了基于熵权双基点的评价模型的可用性。     

二语习得研究:回顾与展望

系统探讨第二语言习得本质及习得过程的第二语言习得研究作为一门独立的学科发展到现在已有40多年的历史,其间研究领域不断拓宽,研究方法和手段日益多样,各种理论/模式层出不穷。     

海峡两岸对所得避免双重征税的法律构造

台湾地区"所得基本税额条例"的第12条第1项第1款自2010年1月1日起生效,确立了属地兼属人的混合税收管辖原则,使得海峡两岸税收管辖权的冲突问题凸显,也为构造对所得避免双重征税的法律制度提供了重要的实践契机。中国大陆开征的个人所得税与企业所得税和台湾地区开征的综合所得税与营利事业所得税的纳税人和征税对象绝大部分重合,这就使得海峡两岸对所得双重征税存在很大的可能及避免之必要。两岸对所得避免双重征税的法律制度,包括大陆与台湾地区的单边抵免规则和两岸短期内必须谈签的双边税收安排。     

《SPS协定》对中国农产品出口效应及法律对策研究

随着世界贸易自由化进程的不断加快,非关税壁垒特别是技术性贸易壁垒成为各国新的贸易屏障,许多国家通过制定严苛的卫生及植物卫生措施限制进口,以保护国内市场。《SPS协定》对中国农产品出口造成了正、负两方面效应,从中分析中国农产品出口的现状及存在问题,法律上应补充、完善中国的标准立法体系、加强技术法规制定、建立卫生与植物卫生措施的预警机制、建立相关的法律协助机构,同时应利用《SPS协定》等应对措施,以便趋利避害促进中国农产品出口贸易的长效发展。     

Customer complaint behaviour (CCB) in the retail sector: why do customers voice their complaints on Facebook?

With the increasing usage of platforms such as Facebook, understanding customer complaint behaviour (CCB) in the context of the social media is imperative for any businesses. Of the two billion users on Facebook, more than half of its users have shared their product-related experiences with others on the platform. This paper aims to explore CCB in the context of social media in regards to customers’ unfavourable buying experiences in the retail sector. A qualitative research approach and 12 in-depth interviews were conducted. The findings indicate that the respondents’ initial contact with the retailer directly resulted in service recovery failures and undesirable outcomes. Such double deviation then leads to frustration and uncertainty of the situation, which furthermore led to the respondents’ need to voice their complaint by sharing their unfavourable experiences on Facebook. The main reasons for the respondents to voice their complaints on the platform is to vent frustration, to share their unfavourable experiences, a need to be seen, understood and respected, to seek revenge by damaging the retailer’s reputation as well as offering the retailer a chance to improve. A proper way to manage complaints, in which frontline employees can solve the problem before the customers feel the need to turn to the social media, is crucial. However, once the complaints are voiced on Facebook, it is imperative to respond to the complaints and acknowledge the problem rather than ignoring the situation.     

On bootstrapping the mode in the nonparametric regression model with random design

In the nonparametric regression model with random design and based on i.i.d. pairs of observations (X _i, Y _i), where the regression function m is given by m(x)=?(Y _i|X _i=x), estimation of the location θ (mode) of a unique maximum of m by the location of a maximum of the Nadaraya-Watson kernel estimator for the curve m is considered. In order to obtain asymptotic confidence intervals for θ, the suitably normalized distribution of is bootstrapped in two ways: we present a paired bootstrap (PB) where resampling is done from the empirical distribution of the pairs of observations and a smoothed paired bootstrap (SPB) where the bootstrap variables are generated from a smooth bivariate density based on the pairs of observations. While the PB requires only relatively small computational effort when carried out in practice, it is shown to work only in the case of vanishing asymptotic bias, i.e. of “undersmoothing” when compared to optimal smoothing for mode estimation. On the other hand, the SPB, although causing more intricate computations, is able to capture the correct amount of bias if the pilot estimator for m oversmoothes. Received: May 2000     

林业企业资本运营的概念及问题

本文论证资本运营是深化林业企业改革和从整体上搞活林业经济的重要思路 ,并分析构建和培育合格的资本运营主体 ,建立林业企业资本运营机制的重要性 ,提出现代林业企业资本运营的着重点是筹资、投资和产权交易。     

开放经济条件下中国证券市场整合研究

会计委派制是我国会计人员管理体制的一项重大改革 ,近年来 ,各地区加大了会计委派制试点的力度 ,在试行过程中 ,出现了种种问题 ,需要在理论上和实践上不断总结完善。本文对尚在探索中的会计委派制的形式、存在的问题及会计委派制的进一步完善进行了阐述和讨论。     

综合型物流企业的物流直接成本核算方法研究

企业第三利润源的物流,在现代经济生活中扮演着越来越重要的角色。而物流成本在综合型物流企业的成本中占据很大的比例,造成这一现象的重要原因就是对物流部门管理不善。