Dynamic Model Averaging and CPI Inflation Forecasts: A Comparison between the Euro Area and the United States

The paper forecasts consumer price inflation in the euro area (EA) and in the USA between 1980:Q1 and 2012:Q4 based on a large set of predictors, with dynamic model averaging (DMA) and dynamic model selection (DMS). DMA/DMS allows not solely for coefficients to change over time, but also for changes in the entire forecasting model over time. DMA/DMS provides on average the best inflation forecasts with regard to alternative approaches (such as the random walk). DMS outperforms DMA. These results are robust for different sample periods and for various forecast horizons. The paper highlights common features between the USA and the EA. First, two groups of predictors forecast inflation: temporary fundamentals that have a frequent impact on inflation but only for short time periods; and persistent fundamentals whose switches are less frequent over time. Second, the importance of some variables (particularly international food commodity prices, house prices and oil prices) as predictors for consumer price index inflation increases when such variables experience large shocks. The paper also shows that significant differences prevail in the forecasting models between the USA and the EA. Such differences can be explained by the structure of these respective economies. Copyright © 2015 John Wiley & Sons, Ltd.     

An Algorithm to Identify Positive Cycles in GPRs

The purpose of this paper is to identify cycles,and in particular positive cycle(s),in anactivity network under generalized precedence relations(GPRs).An algorithm is provided to searchfor such cycle(s).An improved depth-first search is adopted.An efficient arc-oriented representationis used in the algorithm to save on computer storage requirement.     

Tsirelson空间的单位球面上等距算子的延拓

给出了Tsirelson空间的单位球面上满足某些条件的等距算子的表现定理,进而部分地肯定回答了Tsireison空间上的等距延拓问题.     

Wiener-Hopf factorization of a class of matrix functions and Corona theorem

By using Riemann-Hilbert method and Corona theorem, Wiener-Hopf factorization for a class of matrix functions is studied. Under appropriate assumption, a sufficient and necessary condition for the existence of the matrix function admitting canonical factorization is obtained and the solution to a class of non-linear Riemann-Hilbert problem is also given. Furthermore, by means of non-standard Corona theorem partial estimation of the general factorization can be obtained. Foundation item: Supported by the National Natural Science Foundation of China(10471107) and the Specialized Research Fund for the Doctoral Program of Higher Education of China (20060486001)     

从地下空间权角度分析小区地下车库的权属

分析了小区地下车库的地下空间使用权,认为国家应确定地下空间利用权,保障业主住宅功能最大化实现。小区地下车库的建造需要以取得地下空间利用权为前提,进而才能成为合法物的所有权客体。国家应加强对小区地下车库价格的干预,避免车库资源浪费。     

基于信息共享空间环境的图书馆员的素质和技能

概述了信息共享空间,探讨了在信息共享空间环境下图书馆员应具备的素质和技能.     

θ(t)型奇异积分算子在各向异性Hardy空间的有界性

对于伴随于一个扩张矩阵A的各向异性Hardy空间H^p（R^n）,利用此空间的原子分解和分子分解,本文讨论了伴随于A的θ（t）型奇异积分算子在各向异性Hardy空间H^1（R^n）到L^1（R^n）空间的有界性,以及在各向异性Hardy空间H^p（R^n）自身上的有界性。这些结果拓展了θ（t）型奇异积分算子在Hardy空间有界性的结论。     

双曲空间中具有非正Ricci曲率的超曲面

讨论双曲空间中具有非正Ricci曲率的超曲面的性质,得到了超曲面第二基本形式模长平方的一个最优下界。进而,还得到了主曲率乘积的一个上界。     

Hilbert空间上混沌的加权移位算子

利用权数讨论了加权移位算子T在Hilbert空间l^2（N）上的混沌性质,并给出这些性质在空间l^2（Hn）上的推广;接着讨论了加权移位算子轨道的复杂性,指出一个线性算子的轨道可以和一个紧距离空间上的任意连续函数的轨道具有相同的复杂性．     

刘庆邦文学世界的二元结构

作为一个具有高识别度的小说家,刘庆邦通过种种向度各异的二元结构的不断重复使用,表达自身对于外部现实的感知,并依此建立起了自己的文学世界.二元之间的博弈和时比使得刘庆邦的写作呈现了丰富的复杂意味,但从文学的角度来说,二元结构模式仍然是有待突破与超越的.