3,207 research outputs found

    An Extended UTAUT Model for the Study of Negative User Adoption Behaviours of Mobile Commerce

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    An extended Unified Theory of Acceptance and Use of Technology (UTAUT) for mobile commerce (m-commerce) was empirically tested using data collected from a web survey distributed to and through the Hong Kong undergraduates and postgraduates. The partial least squares (PLS) technique of the structural equation modeling (SEM) was used to evaluate the causal model and the confirmatory factor analysis (CFA) was performed to examine the reliability and validity of the measurement model. Findings indicated that the new construct of Disturbance Concerns (DC) is a significant factor affecting users’ behavioural intention. This study aims to understand both the positive and negative factors that can significantly explain user acceptance intention and use behaviour so that service providers can adjust their strategies for providing successful m-commerce services. It also provides a base for further research on the user acceptance models of new information systems

    User Adoption Behaviors of Mobile Commerce: China VS Taiwan

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    This study aims to further test the technology acceptance model for mobile commerce (m-commerce) in China and Taiwan. Data was collected from 156 college students in Macau (China) and 173 college students in Kaohsiung (Taiwan). Exploration factor analysis is performed to examine the reliability and validity of the model; regression analysis is performed to access the relationship between behavior intention and each factor in these two markets; and t-tests are performed to compare the difference in the means from Chinese and Taiwan college students. This study finds out that even there is not significant culture difference between China and Taiwan, there is a significant difference in the means of social influence between these two markets

    An Empirical Study on the Logistics Service Quality of Online Shopping Business in China

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    This study aims to find out the differences between customer expectations and customer experiences on logistics service quality (LSQ) of online shopping in China. Data was collected from 153 respondents through an online shopping site. Structural equation modeling is used to examine the reliability and validity of the research model. This study indicates that order condition and order discrepancy handling are the most important LSQ areas that logistics service providers should address in order to improve their service quality as well as to strength their business development

    Literature review on service quality in hospitality and tourism (1984-2014): Future directions and trends

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    Purpose – The purpose of this study is to examine the development of service quality research in hospitality and tourism from 1984 to 2014, to identify research gaps, and to suggest directions for future research. Design/methodology/approach – This review comprised three steps with the first being the generation of a structural map by using the online pathfinder network (PFNET) to identify potential research themes. The second research step involved an online literature search covering 2,211 academic journal articles to obtain basic information for planning an additional content investigation concerning the research themes. The final step was to investigate the content of the articles published in top-tier journals or frequently cited ones in three different stages (1984-1993, 1994-2003, and 2004-2014) in order to explore potential research topics. Finding – The study identifies 17 research themes that comprise two main research themes, seven sub-stems, six outer-leaves, and two little-leaves. The developments of service quality research in each theme are explored. The role of each theme in service quality study is revealed. Finally, this study identifies research opportunities for service quality research within each theme. Practical implications – This study demonstrates how to use PFNET to effectively perform a systematic literature review. By referring to previous publications reviewed in this study, researchers can contribute by extending existing theories in their further research on the seventeen themes

    The Quark-Antiquark Asymmetry of the Nucleon Sea from Λ\Lambda and Λˉ\bar{\Lambda} Fragmentation

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    We present a general analysis of the spin transfer for Λ\Lambda and Λˉ\bar{\Lambda} production in deep-inelastic scattering of polarized charged leptons on the nucleon, and find that the pattern of different behaviors of Λ\Lambda and Λˉ\bar{\Lambda} production observed by the E665 Collaboration suggests the possibility of quark-antiquark asymmetries either in the quark to Λ\Lambda fragmentation functions and/or in the quark and antiquark distributions of the target proton. We also point out that the strange-antistrange asymmetry of the nucleon sea may produce an observable contribution to the different behaviors of Λ\Lambda and Λˉ\bar{\Lambda} production. We find that a softer sˉ(x)\bar{s}(x) than s(x)s(x) as predicted by the light-cone baryon-meson fluctuation model of intrinsic quark-antiquark pairs of the nucleon sea might lead to a reasonable picture. However, the magnitude is still too small to explain the E665 data and the conclusion has also strong model-dependence. This may suggest the importance of quark-antiquark asymmetry in the quark to Λ\Lambda fragmentation functions, provided that the E665 data are confirmed.Comment: 15 latex pages, 2 figure

    Ratio of Λˉ/Λ\bar{\Lambda}/\Lambda in Semi-inclusive Electroproduction

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    It is shown that the Λˉ/Λ\bar{\Lambda}/\Lambda cross section ratio in semi-inclusive electroproduction of Λ\Lambda and Λˉ\bar{\Lambda} hyperons in deep inelastic scattering of charged lepton on a nucleon target, can provide useful information on the quark to Λ\Lambda fragmentation functions. This ratio is calculated explicitly in a quark-diquark model, a pQCD based analysis, and an SU(3) symmetry model, with three different options for the contribution from the unfavored fragmentation functions. The xx-dependence of this ratio is sensitive to the ratio of unfavored fragmentation functions over favored fragmentation functions, DuˉΛ(z)/DuΛ(z)D_{\bar{u}}^{\Lambda}(z)/D_{u}^{\Lambda}(z), whereas the zz-dependence is sensitive to the flavor structure of the fragmentation functions, i.e., the ratio DuΛ(z)/DsΛ(z)D_u^{\Lambda}(z)/D_s^{\Lambda}(z). Future measurements by the HERMES Collaboration at DESY can discriminate between various cases.Comment: 11 latex files, 6 figure

    The Effect of a Restraint Reduction Program on Physical Restraint Rates in Rehabilitation Settings in Hong Kong

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    Background. In view of the adverse effects of using restraints, studies examining the use of restraint reduction programs (RRPs) are needed. Objectives. To investigate the effect of an RRP on the reduction of physical restraint rates in rehabilitation hospitals. Methods. A prospective quasi-experimental clinical trial was conducted. Demographic data, medical and health-related information on recruited patients from two rehabilitation hospitals, as well as facility data on restraint rates were collected. Results. The increase in the restraint rate in the control site was 4.3 times greater than that in the intervention site. Changes in the restraint mode, from continuous to intermittent, and the type of restraint used were found between the pre- and postintervention periods in both the control site and the intervention site. Discussion. Compared with that in the control site, the RRP in the intervention site helped arrest any increase in the restraint rate although it had no effect on physical restraint reduction. The shift of restraint mode from continuous to intermittent in the intervention site was one of the positive outcomes of the RRP

    Nuclear Antishadowing in Neutrino Deep Inelastic Scattering

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    The shadowing and antishadowing of nuclear structure functions in the Gribov-Glauber picture is due respectively to the destructive and constructive interference of amplitudes arising from the multiple-scattering of quarks in the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron and Odderon contributions from multi-gluon exchange as well as Reggeon quark-exchange contributions. We show that the coherence of these multiscattering nuclear processes leads to shadowing and antishadowing of the electromagnetic nuclear structure functions in agreement with measurements. This picture leads to substantially different antishadowing for charged and neutral current reactions, thus affecting the extraction of the weak-mixing angle θW\theta_W. We find that part of the anomalous NuTeV result for θW\theta_W could be due to the nonuniversality of nuclear antishadowing for charged and neutral currents. Detailed measurements of the nuclear dependence of individual quark structure functions are thus needed to establish the distinctive phenomenology of shadowing and antishadowing and to make the NuTeV results definitive.Comment: 38 pages, 15 figure

    AutoMerge: A Framework for Map Assembling and Smoothing in City-scale Environments

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    We present AutoMerge, a LiDAR data processing framework for assembling a large number of map segments into a complete map. Traditional large-scale map merging methods are fragile to incorrect data associations, and are primarily limited to working only offline. AutoMerge utilizes multi-perspective fusion and adaptive loop closure detection for accurate data associations, and it uses incremental merging to assemble large maps from individual trajectory segments given in random order and with no initial estimations. Furthermore, after assembling the segments, AutoMerge performs fine matching and pose-graph optimization to globally smooth the merged map. We demonstrate AutoMerge on both city-scale merging (120km) and campus-scale repeated merging (4.5km x 8). The experiments show that AutoMerge (i) surpasses the second- and third- best methods by 14% and 24% recall in segment retrieval, (ii) achieves comparable 3D mapping accuracy for 120 km large-scale map assembly, (iii) and it is robust to temporally-spaced revisits. To the best of our knowledge, AutoMerge is the first mapping approach that can merge hundreds of kilometers of individual segments without the aid of GPS.Comment: 18 pages, 18 figur

    Flavor and Spin Structure of Octet Baryons at Large x

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    The quark flavor and spin distributions in octet baryons are calculated both in the SU(6) quark spectator diquark model and in a perturbative QCD (pQCD) based model. It is shown that the Λ\Lambda has the most significant difference in flavor structure at large xx between the two models, though the flavor and spin structure of other baryons can also provide tests of different models. The Drell-Yan process for Σ±\Sigma^{\pm} beams on isoscalar targets can be used to test different predictions concerning the valence quark flavor structure of the Σ±\Sigma^{\pm}.Comment: 24 pages, 11 figures, version published in Nucl.Phys.B 574 (2000) 33
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