User centric cloud service model in public sectors: Policy implications of cloud services     

Dong-Hee Shin 《Government Information Quarterly》2013

This study examines the acceptance of cloud computing services in government agencies by focusing on the key characteristics that affect behavioral intent. The study expanded upon the technology acceptance model by incorporating contextual factors such as availability, access, security, and reliability. The research model was empirically verified by investigating the perception of users working in public institutions. Modeling results showed that user intentions and behaviors were largely influenced by the perceived features of cloud services. Also these features were found to be the significant antecedents of cloud computing usefulness and ease of use. The findings should guide governments' promotion of cloud public services to increase user awareness by enhancing usability and appeal and ensuring security.  相似文献   

Cronbach's Alpha Versus Components of Variance Approach (COVA): Dispelling Three Myths about Alpha and Suggesting an Alternative Reliability Statistic for Communication Trait Research     

Charles J. Wigley III 《Communication Research Reports》2013,30(3):281-286

This study examined the effects of sociocultural factors and perceptions of mental illness on preferences for indirect disclosure. We surveyed 354 college students from China and the U.S. The results indicated that (a) males and members of the collectivistic culture reported more stigmatized attitudes; (b) stigma endorsement was positively associated with preferences for indirectness; and (c) males, members of the collectivistic culture, and individuals without previous interpersonal contact with someone with a mental illness were more likely to recommend an indirect disclosure strategy. The findings demonstrate the importance of considering how sociocultural factors can affect individuals’ preferences for disclosing stigmatized identities.  相似文献   

Evaluating Instrument Quality in Science Education: Rasch‐based analyses of a Nature of Science test     

Irene Neumann  Knut Neumann  Ross Nehm 《International Journal of Science Education》2013,35(10):1373-1405

Given the central importance of the Nature of Science (NOS) and Scientific Inquiry (SI) in national and international science standards and science learning, empirical support for the theoretical delineation of these constructs is of considerable significance. Furthermore, tests of the effects of varying magnitudes of NOS knowledge on domain‐specific science understanding and belief require the application of instruments validated in accordance with AERA, APA, and NCME assessment standards. Our study explores three interrelated aspects of a recently developed NOS instrument: (1) validity and reliability; (2) instrument dimensionality; and (3) item scales, properties, and qualities within the context of Classical Test Theory and Item Response Theory (Rasch modeling). A construct analysis revealed that the instrument did not match published operationalizations of NOS concepts. Rasch analysis of the original instrument—as well as a reduced item set—indicated that a two‐dimensional Rasch model fit significantly better than a one‐dimensional model in both cases. Thus, our study revealed that NOS and SI are supported as two separate dimensions, corroborating theoretical distinctions in the literature. To identify items with unacceptable fit values, item quality analyses were used. A Wright Map revealed that few items sufficiently distinguished high performers in the sample and excessive numbers of items were present at the low end of the performance scale. Overall, our study outlines an approach for how Rasch modeling may be used to evaluate and improve Likert‐type instruments in science education.  相似文献   

图书馆服务质量的本土化模型：高阶因子结构与测量   总被引：2，自引：0，他引：2  

刘锦源 《图书情报工作》2008,52(1):93-93

在回顾图书馆服务质量测评当前研究状况的基础上,建立了五维度(因子)的本土化图书馆服务质量模型,并证实存在高阶因子主宰五维度的表现。经过严谨的信度与效度检验,该模型不仅有效揭示了图书馆服务质量测量的高阶因子结构关系,而且可以确定测量指标对各因子的影响程度。据此,将图书馆服务质量指数化,为其改进提供依据。  相似文献   

基于射频识别技术的高速公路收费系统安全性研究     

闫群民 《科技广场》2009,(5):85-87

随着全国高速公路里程的不断增加,新型收费站收费系统的建立势在必行.本文介绍了基于射频识别技术的高速公路收费系统,主要从系统的网络结构建设、系统数据安全及系统安全保障等方面,阐述了在这种收费模式下系统的安全性问题,并通过这些措施以确保高速公路收费系统的安全性和可靠性,对今后高速公路联网收费系统的设计和实施提出了有益参考.  相似文献   

Validity and reliability of a low-cost dynamometer to assess maximal isometric strength of upper limb     

Natalia Romero-Franco  Juan C Fernández-Domínguez  Juan A Montaño-Munuera  Javier Romero-Franco  Pedro Jiménez-Reyes 《Journal of sports sciences》2019,37(15):1787-1793

Muscle imbalance and deficit are key parameters for guiding rehabilitation and sports sessions and avoiding injuries. However, the high cost and non-portable nature of most instruments employed for muscle strength assessment frequently hamper an affordable evaluation in field conditions. This study evaluated the validity and reliability of a low-cost digital dynamometer to assess the maximal isometric strength of upper limb muscles. Fourteen physically active volunteers performed the main movements of the upper limb at maximal isometric strength: flexion-extension, internal-external rotation and abduction-adduction of the shoulder; and flexion-extension of both elbow and wrist. Validity was examined by comparing the strength values from the low-cost digital dynamometer and those measured by an isokinetic dynamometer, assumed as the gold standard. The correlation between both devices was perfect (r > 0.913), while Bland-Altman plots showed absolute agreement between both devices, the maximum range of the values of bias was ?0.99–1.00 N in wrist extension. Inter-tester and intra-tester reliability were excellent for all movements (ICC ≥ 0.855). The low-cost digital dynamometer showed strong validity and excellent reliability in assessing maximal isometric strength during the main movements of the upper limb. Professionals may use it for an affordable isometric muscle strength assessment in field situations.  相似文献   

Static and dynamic accuracy of a magnetic-inertial measurement unit used to provide racket swing kinematics     

Benjamin Kane Williams  Ross H. Sanders  Joong Hyun Ryu  Pitre C. Bourdon  Philip Graham-Smith  Peter J. Sinclair 《Sports biomechanics / International Society of Biomechanics in Sports》2019,18(2):202-214

Magnetic-inertial measurement units (MIMUs) are becoming more prevalent in sports biomechanics and may be a viable tool to evaluate kinematic parameters. This study examined the accuracy of a MIMU to estimate orientation angles under static conditions and dynamically from a squash racket during a forehand drive shot. A MIMU was mounted onto a goniometer and moved through 0–90°, with static data collected at 10° increments during 10 repetitions of all three axes. Typical error analyses showed the MIMU to be very reliable (TE ≤ 0.03°). MIMU accuracy was determined via intraclass correlation coefficients (ICC) (r > 0.999, p < 0.001). An ordinary least products regression showed no proportional bias and minimal fixed bias for all axes. Dynamic accuracy was assessed by comparing MIMU and optical motion capture data of squash racket swing kinematics. A MIMU was fixed onto a racket and 10 participants each hit 10 forehand shots. Mean orientation angle error at ball impact was <0.50° and ICC showed very high correlations (r ≥ 0.988, p < 0.001) for all orientations. Swing phase root mean squared errors were ≤2.20°. These results indicate that a MIMU could be used to accurately and reliably estimate selected racket swing kinematics.  相似文献   

UPS配电系统的可靠性分析   总被引：1，自引：0，他引：1  

毛世昌 《科技广场》2006,(7):115-116

本文主要阐述如何使UPS配电系统达到99.99%的可用性标准,以满足银监会、证交所、航管、IDC等重要的数据中心对配电系统安全性的要求。  相似文献   

Inspection-replacement policy of system under predictive maintenance     

LIU Bao-you FANG You-tong WEI Jin-xiang WANG Yong-liang 《浙江大学学报(A卷英文版)》2007,8(3):495-500

In general, every system is in one of the three states: normal, abnormal, or failure state. When the system is diagnosed as abnormal state, it needs predictive maintenance. If the system fails, an identical new one will replace it. The predictive main- tenance cannot make the system “as good as new”. Under these assumptions, the reliability index and the inspection-replacement policy of a system were studied. The explicit expression of the reliability index and the average income rate (i.e., the long-run average income per unit time) are derived by using probability analysis and vector Markov process method. The criterion of feasibility for the optimal inspection-replacement policy under the maximum average income rate is obtained. The numerical example shows the optimal inspection-replacement policy can raise the average income rate when the optimal inspec- tion-replacement policy is feasible.  相似文献   

The use of secondary school student ratings of their teacher’s skillfulness for low-stake assessment and high-stake evaluation     

《Studies in Educational Evaluation》2018

Previous studies in higher education have shown that the reliability of student ratings of teaching skill increases if multiple ratings by different students are aggregated. This study examines the generalizability of these findings to the context of secondary education. Also, it seeks to validate these findings by comparing reliability levels estimated by the routinely used nested design with those estimated using a more complex design. The sample consisted of 410 students from 17 classes rating 63 teachers working at eight schools across the Netherlands. Using the nested design, the study replicates findings of previous studies in higher education. The findings illustrate how the reliability level of secondary school students’ ratings increases with an increasing number of students. However, these replicated reliability levels were not validated by the more complex design which provided lower estimates. This indicates that the nested design may not provide accurate estimations of rating reliability.  相似文献