Replacing points by compacta in neural network approximation

It is shown that cartesian product and pointwise-sum with a fixed compact set preserve various approximation-theoretic properties. Results for pointwise-sum are proved for F-spaces and so hold for any normed linear space, while the other results hold in general metric spaces. Applications are given to approximation of L_p-functions on the d-dimensional cube, 1?p<∞, by linear combinations of half-space characteristic functions; i.e., by Heaviside perceptron networks.     

基于交-交变频技术实现异步电动机重载起动的研究

为解决异步电动机重载起动存在的不足,提出了一种以80C196KC DSP为控制技术的交-交变频系统的实现方法.该方法具有起动电流小、启动转矩大、启动平滑、运行稳定、控制效果好的特点,详细阐述系统主电路及控制部分的原理和实现方法.     

Teachers’ unions and compensation: The impact of collective bargaining on salary schedules and performance pay schemes

This study examines the impact that collective bargaining has on multiple dimensions of teacher compensation, including average and starting salaries, early and late returns to experience, returns to graduate degrees, and the incidence of different pay for performance schemes. Using data from the School and Staffing Survey (SASS) and a more recent data set, the Teacher Rules, Roles and Rights (TR3), we find that collective bargaining has a significant impact on all aspects of current, qualification-specific salary schedules. Further, we find some evidence that bargaining impacts the design of performance pay plans. Specifically, unions tend to encourage teacher bonuses that are based on additional qualifications or duties, but discourage bonuses that directly reward improved student test scores.     

世界男子单杠项目发展特点分析

采用文献资料、录像观察和统计分析法,对41届世界体操锦标赛和29届奥运会及我国11届全运会单杠决赛前6名运动员的成套D分动作的类型、难度、连接加分和完成情况进行研究,分析当前世界男子单杠发展的新特点。结果表明：飞行动作是构成单杠成套D分价值的重要动作组别,且动作的使用趋于多样化;具有0.2分连接价值的＂二连接＂明显增加,C组及以下难度的D分动作使用趋于减少;高D分是获胜的基础,动作完成质量是取胜的保证。     

论《聊斋志异》中的贤妻良母形象

作为儒家知识分子的蒲松龄,他的思维模式、道德标准仍未能超出传统伦理思想的范畴。他在《聊斋志异》中塑造了为数不少的"贤妻良母"形象。解读这类形象,不仅有助于我们深入认识十七世纪女性的真实风貌,更能由此了解蒲松龄在塑造现实女性时所袒露出的男权意识的伦理理想。     

Measuring patent assessment quality—Analyzing the degree and kind of (in)consistency in patent offices’ decision making

We argue that consistent decision making in judging a patent's validity and basing this on its underlying technological quality are important elements of patent office service (“assessment”) quality. To understand which level of assessment quality patent offices (can) provide, particularly in new technological areas, we study the concordance of the European Patent Office's (EPO) granting and opposition decisions for individual patents. Using the biotechnology industry in the 1980s (an emerging patenting area then) as an example, we find no empirical evidence that the EPO provided maximal or optimal assessment quality as far as can be told from bibliographic indicators. We discuss research limitations and consequences of this first empirical analysis, and suggest ideas for refinements in future work.     

介孔分子筛MCM-41的合成及其合成机理研究

文章综述了国内外对介孔分子筛MCM-41合成的最新研究，以及合成机理研究的新进展，包括液晶模板机理、协同作用机理和电荷匹配机理．     

Who contributes voluntarily to OSS? An investigation among German IT employees

Based on newly assembled survey data, we analyze which individual characteristics of IT employees are associated with the willingness to participate voluntarily in Open Source Software (OSS) projects. We find that, contrary to common expectations, formal educational attainment is not positively associated with the probability or level of OSS contributions. The group of university dropouts, however, does show a particularly high probability of working on such projects. Furthermore, we obtain the striking and novel finding that work-related OSS activities play an important role in determining voluntary OSS contributions during leisure time. Although one has to be cautious regarding the direction of causality, we interpret this as evidence of career-oriented motives in voluntary OSS contributors. The finding is also reinforced by our more specific analysis of the importance of such motives in determining the actual effort invested in OSS projects.     

Academic spin-off’s transfer speed—Analyzing the time from leaving university to venture

For academic spin-offs I analyze the length of the time period between the founder’s leaving of academia and the establishment of her firm. A duration analysis reveals that a longer time-lag is caused by the necessity of assembling complementary skills, either by acquisition by a single founder or by searching for suitable team members. Furthermore, new ventures are established faster if there has been high-level technology transfer, if the founders have access to university infrastructure, or if they receive informal support by former colleagues.     

知识协同及其与相关概念的关系探讨

指出知识协同作为知识管理的高级阶段已经成为知识管理领域的研究热点,但已有的研究缺乏对知识协同与相关概念关系的系统阐述。因此,在总结分析知识协同的概念、要素、运行模式的基础上,重点探讨知识协同与密切相关的概念--知识共享、知识转移、知识网络、知识整合、知识创新等的关系,进而构建知识协同与相关概念的关系结构图,给出知识协同与相关概念的系统动力学模型图,以加深对知识协同内涵的认识和理解,从而也说明其在知识管理研究领域中的意义和地位。