Hénon混沌系统的自适应预测控制与同步

提出了一种Hénon混沌系统的自适应预测控制与同步快速算法。该方法以不确定非线性差分方程为预测模型,预测模型的参数采用递推最小二乘法在线辨识得到。该控制算法占用内存小,计算速度快,具有较强的跟踪给定信号和抑制系统参数摄动和随机噪声的能力。仿真结果验证了该方法的有效性。     

H.264在网络视频监控系统中的应用研究

由于具有压缩率高、图像失真率低、网络适应性强的特点,H.264已经成为网络视频监控系统应用研究中的热门。针对视频压缩效率和实时传输之间的矛盾,以及视频图像质量要求的提高,根据H.264和网络监控系统的技术原理,分析了H.264在网络视频监控系统中的应用优势和可行性,旨在提出一套基于H.264的网络监控系统解决方案。     

Fast mode decision for inter macroblocks in H. 264/AVC

In this paper, a fast mode decision algorithm for inter macroblocks in H.264/AVC is proposed, The algorithm is able to classify all modes by both gradient operator and comparison of space-time correlation. Because only part of modes is used to compare with each other the computational complexity can be reduced greatly. The simulation results show that it takes about 75 % of encoding time for other algorithm with similar visual quality.     

Contests for cooperation—A new approach in German innovation policy

A new approach in German innovation policy organizes contests of proposals for developing innovation networks. Based on an overview of the different programs, we investigate the advantages and problems of such an approach. We find that this type of policy may have a relatively large impact and can, therefore, be regarded as a rather efficient instrument of innovation policy. Compared to conventional policies, administration of the program is a much more critical issue. The contest approach may stimulate learning effects on the side of the administration but may also require a high degree of flexibility. The main disadvantage is the additional time that is required for conducting the contest. As a distinct ‘picking the winner’ approach, the contest approach is not suited as a means for achieving a leveling-out of regional welfare.     

Networks of inventors and the role of academia: an exploration of Italian patent data

This paper proposes a quantitative analysis of social distance between Open Science and Proprietary Technology. A few general properties of social networks within both realms are discussed, as they emerge from the new economics of science and recent applied work on “small worlds”. A new data-set on patent inventors is explored, in order to show that social networks within Proprietary Technology are much more fragmented than Open Science ones, except for science-based technologies. Two propositions are then put forward on the “open” behaviour expected from academic inventors, namely university scientists getting involved in Proprietary Technology networks by signing patents. Both propositions are confirmed by data, which show academic inventors to be more central and better connected than non-academic ones. The database and methodology produced for this paper are suggested to be relevant for the more general debate on the role of geographical and cognitive distance in university-industry technology transfer.     

ONP脱墨浆的可漂性研究

ONP脱墨浆往往需要进一步漂白。对5种用不同脱墨剂处理的ONP脱墨浆进行了H2O2漂白实验,结果表明不同脱墨剂处理的ONP白度增加幅度不相同,各脱墨浆的可漂性并不相同。实际使用ONP脱墨浆时需考虑其漂后白度增幅潜力。     

一类Henstock可积而非Lebesgue可积的函数

通过讨论(L)积分、(IR)积分及(H)积分三者的关系,给出一类(H)可积而非(L)可积的函数.     

Incubator firm failure or graduation?: The role of university linkages

One of the theoretically important factors for incubator firm performance is the strength of their linkages to the research university sponsoring the technology incubator. Herein, we focus on two types of university linkages to the sponsoring institution: a license obtained from the university and a link to university faculty, while controlling for incubator firm linkages to non-sponsoring research universities, among other factors. We propose that a university link to the sponsoring institution reduces the probability of new venture failure and, at the same time, retards timely graduation. Further, we suggest that these effects are more pronounced the stronger the university link. Due to the difficulty of obtaining fine-grained longitudinal data, the incubation literature is characterized by a dearth of studies focusing on incubator firm differential performance. We attempt to take a first step towards closing this gap by testing these hypotheses through following 79 start-up firms incubated in the Advanced Technology Development Center at the Georgia Institute of Technology over the 6-year period between 1998 and 2003. We find broad support for the hypotheses advanced.     

Regional knowledge spillovers: Fact or artifact?

The explanation of different levels of innovation and their spatial distribution represents the central focus of the analysis. The empirical literature documents the incidence of spatial autocorrelation in patenting activities and interprets them as evidence for knowledge spillovers. Alternatively, the authors propose the spatial pattern of input variables in innovation processes as driving forces of patenting autocorrelation. They analyze 51 Nuts 1 regions in Europe and find that the high degree of spatial autocorrelation exhibited by patent applications can be explained comprehensively by the spatial location of the input factors in the knowledge production function. These are traditional indicators on R&D investments and human capital from Eurostat and proxy variables on social capital from the European Values Study. This finding has important implications for the scope of an autonomous regional innovation policy.