基于FPGA的高速Viterbi译码器设计与实现

Viterbi算法是卷积码最常用的译码算法，在卷积码约束长度较大，译码时延要求较高的场合，如何实现低硬件复杂度的Viterbi译码器成为新的课题。本文提出新颖的Viterbi路径权重算法、双蝶形译码单元结构、高效的状态度量存储器等技术，使Viterbi算法充分和FPGA灵活原片内存储和逻辑单元配置方法相结合，发挥出最佳效率。用本算法在32MHz时钟下实现的256状态的Viterbi译码器译码速率可达400Kbps以上，且仅占用很小的硬件资源，可以方便地和Furbo译码单元等集成在单片FPGA，形成单片信道译码单元。     

Entry and Managerial Incentives: A Note

This note reinforces the results in a paper by Sen (International Journal of Industrial Organization, vol. 11, 1993, pp. 123–37). It is shown that his assumption that the incentive schemes in a two‐period model are the same for the two periods is not necessary for the results: only the long‐term nature of contracts with managers matters.     

赤霉素破除鸡树条荚蒾种子双休眠特性技术初探

利用赤霉素对鸡树条荚口发芽种子进行处理，发现24小时浸泡可打破鸡树条荚口种子双休眠特性，使其播种后当年出苗。     

HYSTERESIS IN UNEMPLOYMENT REVISITED: EVIDENCE FROM PANEL LM UNIT ROOT TESTS WITH HETEROGENEOUS STRUCTURAL BREAKS

This paper applies the panel LM unit root tests with heterogeneous structural breaks in level by Im  et al. ( Oxford Bulletin of Economics and Statistics , 67 (2005), pp. 393–419) to re-examine the validity of hysteresis in the unemployment rates of 19 OECD countries. Our empirical findings are favourable to the stationarity of the unemployment rates, i.e., the unemployment hysteresis hypothesis is strongly rejected. Our results suggest that shocks to unemployment rates are temporary and soon converge when we control for breaks. A major policy implication of the study is that a fiscal or monetary stabilization policy would not have permanent effects on the unemployment rates of the 19 OECD countries.     

Intraday Volatility in Interest‐Rate and Foreign‐Exchange Markets: ARCH,Announcement, and Seasonality Effects

We explore the determinants of intraday volatility in interest‐rate and foreign‐exchange markets, focusing on the importance and interaction of three types of information in predicting intraday volatility: (a) knowledge of recent past volatilities (i.e., ARCH or Autoregressive Conditional Heteroskedasticity effects); (b) prior knowledge of when major scheduled macroeconomic announcements, such as the employment report or Producer Price Index, will be released; and (c) knowledge of seasonality patterns. We find that all three information sets have significant incremental predictive power, but macroeconomic announcements are the most important determinants of periods of very high intraday volatility (particularly in the interest‐rate markets). We show that because the three information sets are not independent, it is necessary to simultaneously consider all three to accurately measure intraday volatility patterns. For instance, we find that most of the previously documented time‐of‐day and day‐of‐the‐week volatility patterns in these markets are due to the tendency for macroeconomic announcements to occur on particular days and at particular times. Indeed, the familiar U‐shape completely disappears in the foreign‐exchange market. We also find that estimates of ARCH effects are considerably altered when we account for announcement effects and return periodicity; specifically, estimates of volatility persistence are sharply reduced. Separately, our results show that high volatility persists longer after shocks due to unscheduled announcements than after equivalent shocks due to scheduled announcements, indicating that market participants digest information much more quickly if they are prepared to receive it. However, contrary to results from equity markets, we find no evidence of a meaningful difference in volatility persistence after positive or negative price shocks. © 2001 John Wiley & Sons, Inc. Jrl Fut Mark 21: 517–552, 2001     

‘Territorial deregulation’: local authorities at risk from technical networks

Technical networks (transport, telecommunications, energy etc.) possess paradoxical virtues. They produce ‘structuring effects’ on space, obtaining comparative advantages for the places they serve. But they are ubiquitous factors which also enable a homogenization of space. The myths of deterritorialization and dual space are refuted by empirical analyses of the interaction between networks and territories. Networks ‘format’ market areas and political territories. They create matrixes which until now were controlled by the public powers. Linked to current transformations – globalization, deregulation – the present mode of development of the technical macro‐systems brings about a telescoping of geographical scales which is having an adverse effect on the historic compromise between networks and territories. The boundaries of traditional political space have become obsolete and an economic rationale in the form of an extension of the technical networks predominates. In order to rediscover their policy‐making capacity, local authorities must pay more attention to controlling the occupation of public space as well as to the design and organization of the networks’ hubs. They should encourage the emergence of users as players in the regulation of public utilities so that debates on universal service and territorial equality may be activated. Les réseaux techniques (transport, télécommunication, énergie etc.) sont parés de vertus paradoxales. Ils produiraient des ‘effets structurants’ sur l’espace, procurant des avantages comparatifs aux lieux desservis. Mais, facteurs d’ubiquité, ils permettraient aussi une homogénéisation de l’espace. Ces mythes de la déterritorialisation et de la dualisation de l’espace sont réfutés par les analyses empiriques des interactions entre réseaux et territoires. Les réseaux ‘formatent’ des aires de marché et des territoires politiques; ils fabriquent des métriques, dont les pouvoirs publics avaient jusquà présent la maîtrise. Liées aux transformations en cours – globalisation, dérégulation – le mode de développement actuel des macro‐systèmes techniques entraîne un télescopage des échelles géographiques qui met à mal le compromis historique entre réseaux et territoires. Il y a obsolescence des frontières des espaces politiques traditionnels et prédominance de la logique économique dans l’extension des réseaux techniques. Afin de retrouver des capacités d’action, les collectivités locales doivent porter plus d’attention au contrôle de l’occupation de l’espace public ainsi qu’à la conception et à l’organisation des noeuds de réseau. Elles ont aussi à favoriser l’émergence des usagers comme acteurs de la régulation des services en réseau, afin que soient activés les débats sur le service universel et sur l’équité territoriale.     

Demographic changes, saving, and current account: An analysis based on a panel VAR model

This paper empirically investigates the macroeconomic effects of demographic changes, focusing on saving rates and current account balances. The econometric investigation based on the panel VAR model shows substantial demographic effects on national saving rates and current account balances in the major advanced (G-7) countries. An increase in the dependency rate significantly lowers saving rates, especially public saving rates. Further, a higher dependency rate significantly worsens current account balances.     

完善现代农村教育的功能 服务于社会主义新农村建设

教育为经济发展服务,教育与经济发展是相辅相成、相互促进的。在建设社会主义新农村进程中,更应该发挥农村教育功能,为农村经济发展奠定坚实的基础。本文从发挥人才再生产的功能、普及推广科技知识的功能、农民素质全面教育的功能和农村教育全面服务功能等角度来完善现代农村教育,从而加快社会主义新农村建设。     

无源唤醒模式的远距离无线收发系统低功耗设计

从电源管理上提出了一种新型节省功耗的方法,根据近距离的passive tag和远距离的有源唤醒收发工作原理,设计了超微功耗无源唤醒的远距离收发系统.     

The Effects of Uncertainty on Market Prices: Evidence from Coaching Changes in the NBA

Abstract:  This study examines the effects of uncertainty on market prices. Specifically, we use the National Basketball Association betting market to examine whether uncertainty resulting from midseason coaching changes affects the ability of bettors to accurately set betting lines. We find that uncertainty amid midseason coaching changes results in less accurate pricing, as evidenced by higher volatility and greater overall inaccuracy in betting lines. We also find that uncertainty regarding the ability of the replacement coach and/or his strategies results in less accurate pricing, again evidenced by higher volatility and greater overall inaccuracy in betting lines.