共查询到20条相似文献，搜索用时 31 毫秒
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《The Journal of High Technology Management Research》2001,12(1):93-112
Previous research has contributed to our understanding of technology-intensive firms by proposing alternative typologies or classifications of these firms. This study explores the Koberg typology that characterizes firms by growth stage and production technology into four types of organizations: Embryonic, Start-up, Growth, and Mature Multiline. We propose that, consistent with the typology, firms in each type will differ in strategy, structure, practices, and leadership and that performance is contingent on the fit between organizational factors and typology type. In a study of 377 technology-intensive firms, we find support for differences among organizations in organizational variables by typology type. The characteristics of the organizations as well as the typology are significant in explaining organizational performance. However, except for organizational structure, the firm characteristics that are related to performance do not significantly vary by type. The results are discussed in the context of theory development and managerial implications. 相似文献
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《Information processing & management》2020,57(6):102304
The way that users provide feedback on items regarding their satisfaction varies among systems: in some systems, only explicit ratings can be entered; in other systems textual reviews are accepted; and in some systems, both feedback types are accommodated. Recommender systems can readily exploit explicit ratings in the rating prediction and recommendation formulation process, however textual reviews -which in the context of many social networks are in abundance and significantly outnumber numeric ratings- need to be converted to numeric ratings. While numerous approaches exist that calculate a user's rating based on the respective textual review, all such approaches may introduce errors, in the sense that the process of rating calculation based on textual reviews involves an uncertainty level, due to the characteristics of the human language, and therefore the calculated ratings may not accurately reflect the actual ratings that the corresponding user would enter. In this work (1) we examine the features of textual reviews, which affect the reliability of the review-to-rating conversion procedure, (2) we compute a confidence level for each rating, which reflects the uncertainty level for each conversion process, (3) we exploit this metric both in the users’ similarity computation and in the prediction formulation phases in recommender systems, by presenting a novel rating prediction algorithm and (4) we validate the accuracy of the presented algorithm in terms of (i) rating prediction accuracy, using widely-used recommender systems datasets and (ii) recommendations generated for social network user satisfaction and precision, where textual reviews are abundant. 相似文献
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Rami Faraj Łukasz Jankowski Cezary Graczykowski Jan Holnicki-Szulc 《Journal of The Franklin Institute》2019,356(14):7855-7872
This paper investigates an application of a ball-screw inerter for mitigation of impact loadings. The problem of impact absorption is to provide a minimum reaction force that optimally decelerates and eventually stops an impacting object within the available absorber stroke. It significantly differs from vibration mitigation problems which are typical application of inerters. The paper demonstrates that the optimum absorption can be achieved by fully passive means. For known values of the object mass and inerter parameters, the obtained solution is independent of the impact velocity. The optimum passive absorption is achieved by employing a variable thread lead. As a result, two force components emerge, the typical inertance-related force and a damping-like term, and sum up to provide the optimum constant deceleration force. This result is relatively unique: conventional absorbers do not provide a constant force even with complex active control systems. Finally, an optimization problem is formulated to reduce the influence of process uncertainties (range of possible mass values, unknown friction). The results are verified and analyzed in a numerical example. 相似文献
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《中国科学院院刊(英文版)》2004,(2)
Supported by the Chinese and German governments, with the joint efforts of the leaders and research staffs of the Max Planck Society for the Advancement of Science and the Chinese Academy of Sciences and the assistance of people from all walks of life, the scientific and technological cooperation between the two organizations has been successfully carried out for thirty years. Recalling the past, we are gratified by what we have achieved; looking to the future, we are even more excited at what we are going to do. Invited by the Chinese Academy of Sciences, a delegation from the Max Planck Society led 相似文献
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《中国科学院院刊(英文版)》2006,(2)
Despite its tiny size, the fruitfly (Drosophila) brain is fairly intricate.Recently a group of neuroscien- tists from the CAS Institute of Biophysics (IBP) have managed to catch the first glimpse of the circuitry within a fruitfly neural s ys tem for visu… 相似文献
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《内蒙古科技与经济》2017,(22)
利用1967年~2016年鄂尔多斯市11个国家观测站的地面20:00~20:00降水数据及Micaps数据进行统计分析,其结果表明:春季的3月~4月阶段性干旱明显,5月~7月降水迅速增加,除准格尔旗7月达月降水极大值外其他各站均在8月达月降水极大值,降水主要集中于七八两月,各站5月~9月降水占全年降水的81%~88%之间,最强降水位于夏季、秋季降水次之、冬季最少;50a中干旱年与丰水年的年降水量振幅极大,各站最大值与最小值之差在276mm~493mm之间。从强降水中心看,以鄂托克旗为中心,向东移扩展到乌审召站第二中心,在东北上到东胜站为第三中心,降水强度向四周减小。从年降水量的5次多项式分析看,谷值分别出现在1975年和2005年左右,2005年~2016年西北部和中东部偏北的各站年降水量有明显增加趋势、中西部的鄂托克旗站趋势平直、变化不大、东南部及东北部的达拉特旗站年降水量有明显减少趋势;年降水量空间分布总体趋势为东部多西部少。 相似文献
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《中国科学院院刊(英文版)》2006,20(4):202-202
The integration testing of 4K×4K Charge Coupled Device (CCD) detection system developed by researchers from the CAS Purple Mountain Ob- An image obtained on Oct. 23 with an exposure time of 20 seconds.servatory in cooperation with over- seas coworkers was successfully carried out for the Schmidt tele- scope at the Xuyi station in east China’s Jiangsu Province recently. Preliminary observations have led to exciting results. From the CCD image with an exposure time of 1 sec, 18th magn… 相似文献
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拉萨40a日照变化特征分析 总被引：5，自引：0，他引：5
本文分析了拉萨1961—2000a各季节日照时数的时空分布及多年变化趁势进行了较全面的分析，进一步分析了日照的季节变化特点和异常分布情况，最后对日照与云量、降水及气温的关系进行了相关分析。发现了40a日照时数趋少，2000a达到历史最低值，日照与降水、日照、气温的相关明显。 相似文献
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《英语课程标准》明确指出:提倡任务型教学模式,把综合语言运用能力的培养落实在教学过程中,倡导体验、实践、参与、交流和合作的学习方式,实现任务目标,感受成功,强调学生能用英语做事情。 相似文献
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《中国科学院院刊(英文版)》2006,20(2):88-88
A new comprehensive re- search ship of CAS was launched on Feb. 2 at the Wuchuan Shipyard in Wuhan, capi- tal of central China’s Hubei Province. CAS Vice President LI Jiayang and Vice President of the National Natural Science Founda- tion of China ZHU Zu… 相似文献
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The Catcher in the Rye expounds the theme that growing is a depressing thing.Holden is an alienated adolescence and in search for an identity but get frustrated and anguished. 相似文献
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《中国科学院院刊(英文版)》2004,(4)
The Talbot effect, the self-im-aging of a grating when it isilluminated by a monochro-matic plane wave, was first discov-ered by the English scientist HenryFox Talbot more than a century ago.It is generally described in universitytextbooks as an example of Fresneldiffraction and is considered one ofthe fundamental phenomena inoptics.The phenomenon has re-ceived continuous attention sinceit was first described, not only be-cause understanding it is so fun-damental to the study of optics,but … 相似文献
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Information technology (IT) engagement is defined as a need to spend more time using IT. Practice-based examples show that IT engagement can have adverse effects in organizations. Although users can potentially get more work done through IT engagement, observations show that the users might jeopardize their well-being and hamper their work performance. We aimed to investigate this complexity in the research on IT engagement by examining its potential antecedents and outcomes in organizations. Considering the potentially mixed outcomes, we developed a model to examine the effects of IT engagement on personal productivity and strain. We also aimed to explain the antecedents of IT engagement by drawing on the collective expectations for IT use. In particular, we examined the extent to which normative pressure on IT use drives users’ information load and IT engagement. Finally, we sought to understand whether users’ attempts to avert dependency on IT use reduced their IT engagement. Several hypotheses were developed and tested with survey data of 1091 organizational IT users. The findings help explain the role of normative pressure as a key driver of IT engagement and validate the positive and negative outcomes of IT engagement in organizations. 相似文献
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Lazaro Alessandro Soares Nunes Sayeeda Mussavira Omana Sukumaran Bindhu 《Biochemia medica : ?asopis Hrvatskoga dru?tva medicinskih biokemi?ara / HDMB》2015,25(2):177-192
This systematic review presents the latest trends in salivary research and its applications in health and disease. Among the large number of analytes present in saliva, many are affected by diverse physiological and pathological conditions. Further, the non-invasive, easy and cost-effective collection methods prompt an interest in evaluating its diagnostic or prognostic utility. Accumulating data over the past two decades indicates towards the possible utility of saliva to monitor overall health, diagnose and treat various oral or systemic disorders and drug monitoring. Advances in saliva based systems biology has also contributed towards identification of several biomarkers, development of diverse salivary diagnostic kits and other sensitive analytical techniques. However, its utilization should be carefully evaluated in relation to standardization of pre-analytical and analytical variables, such as collection and storage methods, analyte circadian variation, sample recovery, prevention of sample contamination and analytical procedures. In spite of all these challenges, there is an escalating evolution of knowledge with the use of this biological matrix.Key words: saliva, non-invasive, biological markers, drug monitoring, oral health 相似文献