提高频谱效率的同步快捕方法

本文将QPSK调制用于快捕系统中,提出了一种快捕方案,并与BPSK调制的快捕方法比较,提高了频谱效率。     

Dynamic complexity in a stochastic rationing model

We have constructed a simple discrete-time macroeconomic model founded on individuals' stochastic optimizing behavior. Actual transactions are carried out in a sequence of disequilibrium markets in which the level of aggregate trade is the lesser of aggregate demand and supply, and in which the individual faces all-or-nothing basis stochastic rationing. In such environments, the actual transaction an individual obtains is generally different from the expectation he forms. This difference is a source of macro-dynamics. The paper demonstrates that, through the interactions of individuals in different markets, the expectation adjustment process is inherently nonlinear and generates complex dynamics involving chaos.I am indebted to Professors Richard Day, James Dulgeroff, Hajime Hori, Osamu Kamoike, Masahiro Okuno-Fujiwara, Makoto Towada, Makoto Yano, and two referees of this Journal for helpful comments and many constructive suggestions to improve the quality of this paper substantially. I am grateful to financial support from Tohyo Trust Bank. All remaining errors are my responsibility.     

大国协调与国际安全治理

大国协调是大国共同管理国际冲突与危机的一种多边安全机制。它主要通过会议外交和协商、共识来决策,并依据一致性、合法性、责任性、包容性和自我克制等共有规则与规范行事。从发展进程看,它经历了应对军事安全的传统大国协调和应对综合安全的新大国协调两个不同历史时期。由于大国协调在维持国际和平和解决重大国际危机中发挥着无可替代的作用,因此已成为国际安全治理的主渠道。目前的新大国协调既是对传统大国协调的重要延续,又出现了一些新的变化,如安全议题的多领域、会议机制的多轨道和常设性、成员数量的增多、规则与规范的低法律化和非强制性等。总体上看,在当前的国际环境中,新大国协调比传统大国协调更容易推行,但也存在诸多现实问题,因而必须从合法性、授权性和集中性诸方面予以改进。合法性主要是增强法律化和责任性;扩大授权性可以与权威国际组织缔结成一种委托-代理的关系;集中性的核心是建立一种更具内聚性的新的大国协调,即全球治理中心机制。     

The Real Cost of Financial Capital in the United States,Japan and Korea: Comparison and Convergence Tests

This paper presents alternative measures of the real cost of financial capital in the United States, Japan, and Korea over the 1975-90 period. Japan's cost of financial capital was the lowest among the three countries studied. The U.S. real cost of financial capital was higher than the Korean real cost. Our statistical analyses provide some evidence for shrinking the gap in the real financial costs of Japan and Korea vis a vis the United States. This is the reflection of increasing goods market integration and financial liberalization occurring in Japan and Korea. [F36, G15]     

Endogenous Growth and Trade Liberalization

We develop an endogenous growth model in which trade liberalization has a positive effect on growth. This effect does not depend on marginal re-allocations nor on knowledge-spillovers. Rather, it is due solely to the increase in market size following the integration of product markets. Our result contradicts a widely-help view that trade on physical goodsper sehas no consequences for long-run growth.[F15]     

Long-Run Elasticities of the Demand for Money in Korea:Evidence from Cointegration Analysis

Most recent studies have employed the cointegration technique to investigate the long-run stability of the demand for money. This study considers the case of Korea. It is shown that in the long-run while Ml monetary aggregate is cointegrated with income, interest rate, and the exchange rate, M2 is not. However, results from error correction models reveal that both Ml and M2 have short-run relationship with their determinants. [E41]