一种基于ADV202的视频压缩系统设计

为了解决传统模拟视频系统带宽太宽、易受干扰的问题,设计了一种满足无线信道传输视频信号的特殊要求的视频压缩子系统.该系统的算法采用基于小波变换的M-JPEG2000算法,没有帧间压缩,非常适合在实时性要求很高的情况下压缩数字视频,并且没有JPEG的方块效应,且具有很强的灵活性,可根据不同的需要来通过软件配置来满足其要求.     

哈大齐工业走廊建设中的地方政府职能转变

在哈大齐工业走廊建设过程中,由于“走廊”上的各地方政府管理观念的落后,在实际工作中存在着不同程度的“越位”、“错位”、“缺位”现象,成为“走廊”进一步发展的障碍。因此,哈大齐工业走廊上的地方政府必须转换职能以适应市场经济的要求,从而达到振兴“走廊”经济的目的。     

Mozambique Metical Exchange Rate Dynamics: Evidence of Fractional Co‐Integration in the USA and South African Rates

This paper studies the exchange rate dynamics of the Mozambique metical with respect to the US dollar and the South African rand. However, instead of using standard I(0)/I(1) techniques, we use long memory and fractionally integrated and co‐integrated models. Our results indicate that the two exchange rates are highly persistent, with orders of integration equal to or above 1. They also seem to be co‐integrated, with an order of integration close to albeit above 0 but with an AR coefficient very close to 1. Thus, although the two series seem to be fractionally co‐integrated, shocks in the long‐run relationship between the two variables are persistent and take a long time to disappear.     

OPTIMAL CONTINUOUS-TIME HEDGING WITH LEPTOKURTIC RETURNS

We examine the behavior of optimal mean–variance hedging strategies at high rebalancing frequencies in a model where stock prices follow a discretely sampled exponential Lévy process and one hedges a European call option to maturity. Using elementary methods we show that all the attributes of a discretely rebalanced optimal hedge, i.e., the mean value, the hedge ratio, and the expected squared hedging error, converge pointwise in the state space as the rebalancing interval goes to zero. The limiting formulae represent 1-D and 2-D generalized Fourier transforms, which can be evaluated much faster than backward recursion schemes, with the same degree of accuracy. In the special case of a compound Poisson process we demonstrate that the convergence results hold true if instead of using an infinitely divisible distribution from the outset one models log returns by multinomial approximations thereof. This result represents an important extension of Cox, Ross, and Rubinstein to markets with leptokurtic returns.     

Nonlinear Taylor rules in Central Eastern European countries

This study applies sequential panel selection method (SPSM), proposed by Chortareas and Kapetanios (2009) Chortareas, G., and G. Kapetanios. 2009. “Getting PPP Right: Identifying Mean-Reverting Real Exchange Rates in Panels.” Journal of Banking and Finance 33: 390–404.[Crossref], [Web of Science ®] , [Google Scholar], to investigate to test the validity of Taylor rules to assess the nonstationary properties of the convergence of the real exchange rates for 10 Central Eastern European countries. The SPSM can be used to decompose a panel of real exchange rate series into two groups: a group of stationary series and a group of nonstationary series. We identify the stationary processes in the panel and demonstrate that Taylor rules holds for 7 of the 10 countries studied. These results imply that the choices and effectiveness of the monetary policies in Central Eastern European economies are highly influenced by external factors originating from the United States. Additionally, our findings highlight that their real exchange rate convergence is a mean reversion toward equilibrium values of Taylor rules in a nonlinear manner.     

基于平滑RAT的多相码信号参数估计

针对Radon-ambiguity变换（RAT）在估计多相码信号（Frank码、P1、P2、P3、P4码）调制参数时受噪声影响严重的问题,提出了基于平滑Radon变换的多相码信号参数估计方法。首先理论上分析了噪声影响多相码信号RAT估计性能的原因,进而通过二次平滑估计出信号RAT的噪声基底包络,最后在去除噪声基底的RAT平面中完成多相码信号调制参数的估计。仿真实验表明,该方法调频率和码元宽度估计的信噪比门限相比传统RAT方法分别降低了1 dB和4 dB。     

(n，1，m)递归系统卷积码的盲识别

递归系统卷积码（RSC码）是Turbo码子编码器常采用的编码形式。针对(n,1,m)递归系统卷积码的盲识别问题,给出了完整的编码参数和生成多项式识别方法。首先,采用矩阵分析法先求得卷积码参数,避免后续识别生成多项式时因参数循环估计带来的额外计算量。然后,根据RSC码的特性推导出生成多项式识别模型,给出了模型的具体求解步骤,并对所采用的Walsh-Hadamard变换算法进行了介绍。最后,运用Matlab平台进行仿真验证。仿真结果表明,该方法容错性能明显优于常规方法,在误码率为10－2条件下成功识别概率能达到90%,对于Turbo码的进一步研究具有重要意义。     

基于资源三号卫星数据的喀什市研究区的植被信息提取

通过利用喀什市研究区2012年的资源三号卫星影像,使用ERDAS软件首先提取归一化植被指数(NDVI),再使用Arc GIS软件对研究区的植被覆盖度进行估算,最后得出研究区2012年的植被覆盖度分级图,定量地说明了研究区2012年的植被覆盖情况。     

我国沿海地区渔业发展的收敛特征研究

我国沿海地区渔业的加速发展伴随着渔业区域差异的相应变动.借鉴经济增长区域差异的研究思路,分别采用变异系数和傅里叶单位根检验方法对沿海地区渔业发展的σ收敛和β收敛趋势进行检验.研究结果表明,我国沿海地区渔业发展的σ收敛趋势较弱,而β收敛特征集中于渔业发展水平较高的省份,呈现“俱乐部收敛”态势.因此,沿海各省份应根据自身实际情况采取相应措施,提高渔业发展水平,同时推进渔业的区域协调发展.