基于Ф-OTDR的管道光纤预警系统应用统计分析

基于 Ф-OTDR分布式光纤传感的管道光纤预警系统,利用同沟敷设的光缆作为分布式振动传感器,连续实时检测管道周围的振动信号进行提前预警与定位,通过长输油气管道测试与应用效果展示,系统具有较高的预警灵敏度、定位精度和有效预警准确率.结合应用实际,构建技防+人防管道安全防护体系.     

Do Private Tutoring Expenditures Raise Academic Performance? Evidence from Middle School Students in South Korea

To shed light on the effectiveness of educational inputs for student outcomes, this paper examines the effect of private tutoring expenditures on the academic performance of middle school students in South Korea. To address endogeneity, the paper uses instrumental variables, first‐difference, propensity‐score matching and nonparametric bounding methods. We apply these methods to a panel dataset from South Korea, the Korea Education Longitudinal Study. The results show that the true effect of private tutoring remains, at most, modest. Instrumental variables (first‐difference) estimates suggest that a 10‐percent increase in expenditure raises a test score by 0.03 standard deviations or 1.1 percent (0.002 standard deviations or 0.08 percent). Matching estimates imply that the same amount of increase in expenditure leads to a 0.33 to 0.72 percent higher average test score. The tightest bounds of the effect of tutoring reveal that a 10‐percent increase in expenditure improves the test score by a low of 0 to a high of 2.01 percent, while statistical tests fail to rule out zero effects. The modest effects of private tutoring found in the present study are comparable to the effects of public school expenditures on test scores and earnings estimated in previous studies.     

Changes of Thai economy since 19701 1

Within the last 30 years, the number of Thai population increased from 35 million to 62 million, the general price level went up 6 times, and Thai currency baht devaluated 2.2 times against the dollar. The industrial production increased 36 times nominally. The biggest industry of Thailand changed from agriculture to manufacture, and the total value of exports jumped by 192 times and that of imports grew by 95 times. Thai current account balance had recorded a deficit every year from 1970 to 1996. During the same period of time, however, the capital account balance had shown surplus. The inflow of foreign capital was the only stronghold of Thai economy at that time. In 1997, Thailand suddenly experienced a total change of its external environment From then on, Thai current account shifted from a deficit to a surplus and Thai capital account turned from a surplus to a deficit. The conclusion of this paper indicates that the future of Thai economy is heavily dependent on whether the amount of surplus in Thai current account could surpass the deficit in Thai capital account     

劳动价值论:正确提问与科学创新

本文对劳动价值论研究中的一些思维误区和认识偏差进行了分析，认为深化对马克思主义劳动价值理论的认识，必须完整地、准确地把握这一理论的科学体系，认清其基本线索、基本关系、基本范畴，并以此为指导，紧密联系当今时代发展的新的实际，正确提问，科学创新。     

学院计算机校园网的规划,设计与管理

校园网的建设对于提高我院的教学科研管理水平,营造高科技信息的教学科研实验环境,培养面向世界、面向未来的高层次经济管理专门人才有着极为重要的作用。本文就此讨论了我院校园网的建设规划以及设计的有关问题,并给出了校园网的拓扑结构及网络设备配置的基本方案,同时对今后校园网的管理与使用以及进一步的发展作了相应的论述。企望能以此得到各级领导及广大师生与研究人员对校园网的建设以更大的支持和参与。     

Service quality and its effect on customer satisfaction and customer behavioral intentions: hotel and ryokan guests in Japan

This study analyzes the effect of service quality on customer satisfaction and customer behavioral intentions at hotels and ryokan (traditional Japanese inns). In this empirical research, questionnaires were sent to guests at seven sites: three hotels and four ryokan. Service quality, as perceived by guests, affected customer satisfaction and customer behavioral intention. Results from this empirical study show strong evidence of service quality as perceived by guests being influenced by the type of accommodation. Also, among service quality factors, “physical aspect” had the most powerful impact on customer satisfaction and customer behavioral intention. “Creativeness” ranked second, followed by “unexpected service” and “encounter performance”. The prominence of physical aspects probably reflects the distinctiveness of the service of offering a one-night stay. However, as a certain level of physical facilities is taken for granted at lodging facilities above a certain price, “creativeness”, the second most powerful factor, becomes decisively important.     

The intertemporal risk-Return relation,investor behavior,and technical trading profits: evidence from the G-7 countries

The intertemporal risk-return relation and investor behavior are both important pricing factors that jointly determine the expected market risk premium. Using the price adjustment process as a control variable, we find that the intertemporal risk-return relation is positive conditional on bad market news, but is non-positive conditional on good market news. This implies that good (bad) market news weakens (strengthens) the positive risk-return relation. The pattern in the distortion of the risk-return relation is consistent with short-term mispricing in which investors overvalue (undervalue) the stock market in reaction to good (bad) market news. We also show that ignoring the price adjustment process in the estimation of the risk-return relation leads to model misspecification and induces an upward (downward) bias in estimates of the relative risk aversion parameter conditional on good (bad) news. Our model of the asymmetric risk-return relation along with the price adjustment process is capable of generating the return dynamics that is attributable to technical trading profits. We suggest that the profitability of technical trading rules is not a violation of market efficiency, but a consequence of trading rules exploiting the asymmetric effect of price changes on the risk-return relation, along with the persistence property of price changes.     

New development: Fiscal reform in South Korea: looking back and moving forward

ABSTRACT

At first glance, it seems that South Korea’s three fiscal systems (mid-term expenditure framework, top-down budgeting, and performance management) function well. However, each fiscal system operates separately and they are inefficient because they follow past practices. This article explains what the problems are and how to overcome them.