基于多尺度多方向Gabor模板的光学/SAR景象匹配

合成孔径雷达（SAR）成像制导通常采用光学基准图和SAR实时图 进行特征提取和景象匹配。提出了一种光学/SAR异类影像匹配方法,利用多尺度多方向Gabo r模板提取图像的Gabor特征后进行特征匹配,首先对SAR图像进行方向Frost滤波预处理,然 后分别计算光学图像和SAR图像的高斯梯度图像,再利用多尺度多方向二维Gabor滤波器模板 分别对两幅高斯梯度图像进行特征提取,最后对两组特征矩阵进行归一化互相关匹配。该方 法直接利用光学图像和SAR实时图进行景象匹配,实验表明,该异类影像匹配方法较其他传 统方法具有较高的鲁棒性和准确性。     

分块自适应图像稀疏分解

针对图像稀疏分解的计算时间复杂度非常高这个问题，提出了分块自适应图像稀疏分解算法。该算法根据稀疏分解计算时间复杂度和待分解图像大小之间的关系。把待分解图像分成互不重叠的小块。然后对每个小块图像进行稀疏分解。根据每一块的复杂程度。自适应地决定稀疏分解的结束。实验结果表明。在分解原子个数相近或相同的条件下。新算法对稀疏分解后重建图像比在整幅图像上进行稀疏分解重建的图像质量下降0．5dB。但计算速度提高了约15倍。     

一种稀疏重建的多基地雷达多目标定位算法

采用距离和信息的多基地雷达多目标投影定位算法中,距离向脉冲压缩后分辨率降低,需要已知空间中目标个数。针对此问题,提出了一种稀疏重建的多基地雷达多目标定位方法。该方法利用多个接收机中目标稀疏度相同的特点,通过构造平均重构残余误差变化率和平均散射系数变化率作为正交匹配追踪(OMP)算法迭代终止判定条件,自适应地终止OMP算法的同时获得稀疏重建信号以及信号稀疏度的估计值,提高了距离向分辨率,获得了对空间中目标个数的估计。仿真实验表明所提算法有效抑制了距离向主瓣展宽和旁瓣串扰,提高了距离向分辨率。同时,所提算法在不同噪声环境下能准确估计空间中目标个数并提取其空间位置,实现对空间中目标的准确定位。     

The effects of exports on facility environmental performance: Evidence from a matching approach

This paper employs matching techniques to investigate the effects of facility export status on environmental performance. Using facility-level criteria air emission data in the US manufacturing industry, we find the industry-specific effects of export status on emission intensity, measured by emissions per value of sale. In some industries, there is consistent and robust evidence supporting the superior environmental performance of exporters relative to non-exporters in terms of emission intensity for all criteria air pollutants tracked. In other industries, we find weak evidence that exporters appear to have a higher emission intensity than non-exporters. This industrial heterogeneity in the effects of exporting on the environment is closely related to industrial characteristics including pollution abatement capital expenditure, trade costs, capital intensity and others.     

Is there really a foreign ownership wage premium? Evidence from matched employer-employee data

Numerous studies on firm-level data have reported higher average wages in foreign-owned firms than in domestically owned firms. This, however, does not necessarily imply that the individual worker's wage increase with foreign ownership. Using detailed matched employer-employee data on the entire Swedish private sector, we examine the effect of foreign ownership on individual wages, controlling for individual and firm heterogeneity as well as for possible selection bias in foreign acquisitions. We distinguish between foreign greenfields and takeovers and compare foreign-owned firms with both domestic multinationals and local firms. Our results show a considerably smaller wage premium in foreign-owned firms than what has been found in studies conducted at a more aggregate level. Moreover, foreign takeovers of Swedish firms tend to have no or even a negative effect on wages.     

Real effects of private equity investments: Evidence from European buyouts

This study investigates the effects of buyout deals on the ex-post performance of target companies. The analysis is based on a sample of 241 private-to-private buyouts involving European companies between 1997 and 2004 and a control sample of non-buyouts selected through a propensity score matching methodology. The paper explores three different dimensions of firm performance: size, profitability and productivity. The results indicate a positive impact of buyouts on the growth of total assets and of employment in target firms in the short- and mid-term. An equivalent clear pattern cannot be identified for productivity, while we estimate a lower operating profitability for buyout companies with respect to the control group three years after a deal is made. When we restrict the analysis to the sub-sample of buyout companies, we find that generalist funds negatively and significantly impact the mean ex-post operating profitability of PE-backed firms, while turnaround specialists are positively associated with operating profitability. The evidence also highlights that target companies whose lead investor is located in the same country show relatively higher ex-post profitability performance.     

Impact of fit,involvement, and tenure on job satisfaction and turnover intention

This study examined the interactive effects of need–supplies fit, job involvement, and job tenure on service sector employees' job satisfaction and turnover intention in Turkey. Survey data collected from 252 employees who worked in three different banks and one logistics company operating in Istanbul, Turkey, confirm the three-way interaction in predicting employees' turnover intention. In particular, the effect of needs–supplies fit on turnover intention was found to be more strongly positive for longer tenured, highly involved employees. Results also reveal that while the three-way interaction does not predict job satisfaction, the two-way interaction between needs–supplies fit and job involvement is significant. Specifically, needs–supplies fit had a stronger effect on the job satisfaction of highly job-involved employees than those with lower levels of involvement. Certain implications of these results, as well as avenues for future research, are discussed.     

Entry to foreign markets and productivity: Evidence from a matched sample of Turkish manufacturing firms

We examine the effects of international trading activities of firms on creating productivity gains in Turkey by using a recent firm-level data set over the period 2003–2010. We establish treatment models and investigate the productivity improvements of firms through trade by using propensity score matching techniques together with difference-in-difference estimates. Three different groups of treatment are constructed: (1) firms that are involved only with import activities, (2) firms that are involved only with export activities and (3) firms that are involved with both export and import activities. The results of the study suggest that both exporting and importing have positive significant effects on total factor productivity (TFP) and labour productivity (LP) of firms. Importing is found to have a greater impact on productivity of firms compared to exporting. Further, two-way trade is found to have more significant effects than those of one-way trade on firm productivity. Finally, our results indicate that international trade has greater impact on LP rather than TFP of firms.     

The Impact of Market Orientation on the Internationalization of Retailing Firms: Tesco in Eastern Europe

This paper investigates a Western retailer's market orientation levels in two emerging markets. We examine whether the market orientation-company performance link holds true for retailers in emerging economies, despite environmental differences. By using concepts from key studies we have assimilated a fully representative model - applied through interviews with top management from Tesco and its subsidiaries and affiliates in Hungary and Slovenia. Using this example, we find that the market orientation-business performance link is valid for Western retailers in emerging economies. Here, the retailer applied market orientation predominately through; the use of matching with suppliers of own brand goods; top management emphasis on market orientation and risk taking. Intelligence generation and dissemination was exercised via global processes such as brand review.     

正确把握大思路 配套推进分税制——兼与“纵向分两段，横向分两块”的主张商榷

本文认为,以分税制为基础的分级财政是市场经济新体制所要求的财政体制,需要在统一市场构建中逐步贯通运行这一财政体制,过渡措施不应凝固为实现中长期目标的障碍,要正确把握大思路,配套推进分税制。