Interpreting the web-mining results by cognitive map and association rule approach

A variety of the web-mining techniques are now being extensively utilized to extract useful knowledge about customer behaviors on the Internet. However, the naive interpretation of the web-mining results would lead to poor decision on customer behaviors, which is likely to cause waste of time and efforts on managing electronic commerce strategy. To overcome this pitfall, this study proposes using the cognitive map-based interpretation of the web-mining results. Conventional approach to obtaining the web-mining results is based on the association rule approach (ARA), while the cognitive map approach (CMA) is believed to provide more robust support in interpreting the web-mining results. Therefore, to compare the interpretation capability of the two approaches, the four constructs such as perceived usefulness, causality, information richness, users’ attitude and intention to use the approaches are adopted in the research model and tested against the questionnaire data. The test results obtained through applying the structural equation models reveal that CMA is comparable to ARA and the cognitive map has a great potential in helping enrich the interpretation of the web mining results and build more effective Internet business strategy.     

A local tree alignment approach to relation extraction of multiple arguments

In this paper, we address the problem of relation extraction of multiple arguments where the relation of entities is framed by multiple attributes. Such complex relations are successfully extracted using a syntactic tree-based pattern matching method. While induced subtree patterns are typically used to model the relations of multiple entities, we argue that hard pattern matching between a pattern database and instance trees cannot allow us to examine similar tree structures. Thus, we explore a tree alignment-based soft pattern matching approach to improve the coverage of induced patterns. Our pattern learning algorithm iteratively searches the most influential dependency tree patterns as well as a control parameter for each pattern. The resulting method outperforms two baselines, a pairwise approach with the tree-kernel support vector machine and a hard pattern matching method, on two standard datasets for a complex relation extraction task.     

SiO_2接枝聚酰胺胺树枝状大分子在PS超临界CO_2发泡中的作用研究

在纳米SiO2表面引入聚酰胺胺树枝状大分子(PAMAM),再通过原子转移自由基聚合(A-TRP)合成了一种核-壳结构的SiO2-PAMAM-PS,将改性的纳米SiO2添加到PS基体中作为超临界CO2发泡的成核剂。红外光谱(IR)、差示扫描量热仪(DSC)、热重(TG)等结果表明,SiO2表面成功引入了PAMAM,并且接枝上了PS链段。透射电镜(TEM)显示该成核剂具有核-壳结构及其在PS基体中可以较均匀分散。将添加了改性SiO2的PS进行了超临界CO2发泡,利用扫描电镜(SEM)对泡孔结构进行了表征,结果表明:相比于纯发泡PS,成核剂的加入,改善了PS的泡孔结构,使泡孔尺寸显著减小,泡孔密度明显增加。     

知识产权保护与中国技术进步的实证研究——基于1990～2007年省际面板数据

以中国省际面板数据为基础,控制了"南巡"和WTO等同期发生事件的影响以后,以1993年和2001年两次专利法的重大修改前后作为对比,检验加强专利保护是否促进发展中国家技术进步。实证结果一致显示,更强的专利保护促进中国的技术进步。然而,知识产权保护引起技术进步在高技术集中的省份明显高于其他省份,因此,短期内知识产权保护可能会加大地区间的技术差距。     

云南省宁蒗县树扎铜矿地质特征及矿床成因探讨

树扎铜矿位于区域性构造的挖开断层北东,树劳河～中梁子断层南西相交的二迭系玄武岩组地层内。区域两个构造带应力集中交汇的地段,是造就树扎铜矿的导矿构造、容矿构造之原因。后期从华力西～燕山～喜山期的岩浆热液活动,对树扎铜矿的后期成矿和富集都起了重要作用。本文介绍了树扎铜矿矿区地质概况,阐述了树扎铜矿的地质特征,并对矿床成因进行了探讨分析,对该地区今后的地质工作具有一定的指导意义。     

浅析高校环境景观建设中原生态环境保护与教育设计

在高等教育日益蓬勃发展、取得一个又一个新成果的今天,高校环境景观建设中对原生态环境的保护问题也引起了诸多关注。古往今来,均衡发展以及协调可持续发展是人们所共同向往的,该文简要分析高等院校环境景观建设中与原生态环境之间存在的矛盾问题,并对于其教育意义与作用提出了一些保护和教育设计方法,期盼能对将来高校环境景观建设中原生态环境保护以及教育作用设计贡献些许力量。     

Capillary flow in sacrificially etched nanochannels

Planar nanochannels are fabricated using sacrificial etching technology with sacrificial cores consisting of aluminum, chromium, and germanium, with heights ranging from 18 to 98 nm. Transient filling via capillary action is compared against the Washburn equation [E. W. Washburn, Phys. Rev. 17, 273 (1921)], showing experimental filling speeds significantly lower than classical continuum theory predicts. Departure from theory is expressed in terms of a varying dynamic contact angle, reaching values as high as 83° in channels with heights of 18 nm. The dynamic contact angle varies significantly from the macroscopic contact angle and increases with decreasing channel dimensions.     

Systematic characterization of degas-driven flow for poly(dimethylsiloxane) microfluidic devices

Degas-driven flow is a novel phenomenon used to propel fluids in poly(dimethylsiloxane) (PDMS)-based microfluidic devices without requiring any external power. This method takes advantage of the inherently high porosity and air solubility of PDMS by removing air molecules from the bulk PDMS before initiating the flow. The dynamics of degas-driven flow are dependent on the channel and device geometries and are highly sensitive to temporal parameters. These dependencies have not been fully characterized, hindering broad use of degas-driven flow as a microfluidic pumping mechanism. Here, we characterize, for the first time, the effect of various parameters on the dynamics of degas-driven flow, including channel geometry, PDMS thickness, PDMS exposure area, vacuum degassing time, and idle time at atmospheric pressure before loading. We investigate the effect of these parameters on flow velocity as well as channel fill time for the degas-driven flow process. Using our devices, we achieved reproducible flow with a standard deviation of less than 8% for flow velocity, as well as maximum flow rates of up to 3 nL∕s and mean flow rates of approximately 1-1.5 nL∕s. Parameters such as channel surface area and PDMS chip exposure area were found to have negligible impact on degas-driven flow dynamics, whereas channel cross-sectional area, degas time, PDMS thickness, and idle time were found to have a larger impact. In addition, we develop a physical model that can predict mean flow velocities within 6% of experimental values and can be used as a tool for future design of PDMS-based microfluidic devices that utilize degas-driven flow.     

信息技术引致的吸收能力和组织的竞争优势

从吸收能力和基于资源理论角度解释了信息技术资源和组织竞争优势之间关系的内在作用机制,并提出了相应的假说.研究结果表明,组织通过将信息技术资源转化为信息技术能力,从而影响组织的吸收能力,并进而帮助组织获得竞争优势.此外,还探讨了潜在吸收能力和实现吸收能力对竞争优势的不同作用机制,并基于环境权变理论讨论了两种吸收能力和竞争优势之间关系受环境变化的影响.最后,根据研究结果,就企业如何利用信息技术资源增强企业吸收能力和竞争优势提出了建议     

浅淡对职业学校问题学生教育方式的几点看法

职业学校的学生理论知识较差,自我管理的能力差,又加上年龄上处于青春期,心理还不成熟、情绪不稳定,面对学习、与人相处等问题时,容易产生各种心理问题。本文就面对问题学生时,班主任应该采取的教育方法和措施进行反思和总结。