SDMKD在油气资源勘探中的应用

从空间数据挖掘与知识发现(SDMKD)的内涵入手,对比分析了SDMKD与传统数据挖掘的异同,在归纳SD-MKD的任务与方法、实现过程和研究现状的基础上,对油气资源勘探SDMKD应用现状、面临的主要问题进行了总结和分析。最后,文章给出了油气资源勘探SDMKD的概念模型。     

邹承鲁：攀登前人没有攀登过的高峰

邹承鲁院士是我国著名的生物化学家,长期从事蛋白质结构与功能研究。他参加发起人工合成胰岛素工作,并负责胰岛素A、B两条肽链的拆合,为结晶牛胰岛素的人工全合成作出了重要贡献。他建立了蛋白质必需基团的化学修饰和活性丧失的定量关系公式,以及确定必需基团数的作图方法;提出了酶活性部位柔性假说,将蛋白质变性研究从以结构研究为主推向结构与功能密切结合的水平。本文通过梳理邹承鲁院士的几个重要科学发现,试图展示其在科研实践中所表现出的勇攀高峰、敢为人先的创新精神。     

从考古发现看中国古代的饮食文化传统

有关的考古发现是研究中国古代饮食文化的一个重要的资料来源。对于中国古代的饮食文化传统,根据现有的考古发现资料,可以从古代的烹饪技术和传统炊具、古代的厨师活动及传统食谱、直接出土的古代食物、出土的传统食具等四个方面来认识和研究。     

Trading activity and price discovery in Bitcoin futures markets

This study examines the impact of trading activities on price discovery in the Bitcoin futures markets. We find that trades of hedgers are positively correlated with the modified information shares in both CME and CBOE futures markets, suggesting that their trading promotes futures market efficiency. Retailers’ trading activity relates negatively to the price discovery of the CME Bitcoin futures and thus destabilizes the market. Speculators exert positive (negative) impact on the price discovery in the CME (CBOE) Bitcoin futures. Our finding that CME’s Bitcoin futures exhibit superior price discovery than CBOE’s provides plausible justification for CBOE’s decision in March 2019 to suspend further listings of Bitcoin futures contracts.     

The price discovery role of day traders in futures market: Evidence from different types of day traders

Using proprietary account-level transaction data in the futures market where day traders are self-declared ex ante, this study investigates whether day traders enhance price discovery at the market level. From a natural classification of day traders, we find that heterogeneous day traders have differential effects on price discovery. Self-declared day traders, who benefit from low margin requirement, do not improve price discovery measured by information share. In contrast, non-declared traders, who are not self-declared as day traders, improve price discovery. Their positive impacts on price discovery are particularly significant during periods of high volatility and arrival of new information. Overall, a margin stimulating policy may encourage more day trading, but may also attract overconfident investors, especially inexperienced ones, and who do not enhance price discovery.     

The Effect of Political Uprisings on the Location of Price Discovery: Evidence from Egyptian Cross-Listed Equities

In this study, we aim to determine the location of price discovery for Egyptian cross-listed stocks around the political uprising that started on January 25, 2011, and resulted in a two-month stock market closure. We measure price discovery using Gonzalo and Granger's component share and Hasbrouck's information shares and find that, for some stocks, the contribution of the foreign market in pricing cross-listed equities increases in the period directly following the reopening of the Egyptian stock market. We discuss the factors that could explain the more pronounced shifts in the location of price discovery for some companies in the post-uprising period.     

A context-based service matching approach towards functional reliability for industrial systems

ABSTRACT

As service-oriented computing is commonly used in industrial systems to deal with the continually changing business environment, matching processes with existing services becomes one of the most important phases in constructing, integrating and optimizing information systems. The precision of semantic service matching becomes a critical factor in ensuring the correctness of functionalities in system processes. However, the dependability of semantic service matching cannot be warranted in complex contexts. To improve semantic service matching for industrial systems, a context-based semantic service matching approach named ‘Process-Based service MatchMaker’(PBMM) is proposed in this paper. It selects the suitable services for the process from candidate services through taking the dependencies of related services process into consideration.     

The impact of sentiment on price discovery

We study how investor sentiment affects the speed with which prices reflect information. Price discovery is more timely for firms with greater sensitivity to sentiment, as measured by a sentiment beta. Our research improves our understanding of the price formation process when sentiment is not assumed to be constant. Our research design is novel as it considers a sentiment beta as well as economy‐wide sentiment. This provides more comprehensive evidence on the impact of differing types of sentiment on the price formation process.     

农村产权抵押物变现的现实困境与破解对策

农村产权抵押融资是盘活农村“沉睡资产”的重要渠道,也是增加农民财产收入的重要途径,而产权抵押物变现难是目前制约我国农村产权抵押融资健康发展的主要因素之一。由于我国农村产权流转存在刚性制度约束、农村产权的有效市场需求和流动性不足及其确权成本高且操作难,导致农村产权抵押物的收储与管理难、价值发现难、价值评估难和价值变现难。应完善农村产权抵押物变现的法律支撑体系,优化政府主导的宏观调控机制,构建包括资产管理中心、信息中心、交易中心、价值评估中心的农村产权交易市场体系,并完善农村产权确权颁证制度和农村社会保障制度等相关配套措施,以有效破解农村产权抵押物变现难困境,推动农村产权抵押融资发展。