Automatic domain ontology extraction for context-sensitive opinion mining

Automated analysis of the sentiments presented in online consumer feedbacks can facilitate both organizations’ business strategy development and individual consumers’ comparison shopping. Nevertheless, existing opinion mining methods either adopt a context-free sentiment classification approach or rely on a large number of manually annotated training examples to perform context sensitive sentiment classification. Guided by the design science research methodology, we illustrate the design, development, and evaluation of a novel fuzzy domain ontology based contextsensitive opinion mining system. Our novel ontology extraction mechanism underpinned by a variant of Kullback-Leibler divergence can automatically acquire contextual sentiment knowledge across various product domains to improve the sentiment analysis processes. Evaluated based on a benchmark dataset and real consumer reviews collected from Amazon.com, our system shows remarkable performance improvement over the context-free baseline

Leveraging Communication Tools to Reduce Consumers’ Privacy Concern in the On-demand Services: An Extended S-O-R Model of Perceived Control and Structural Assurance

To use the on-demand services, consumers need to disclose themselves to some extent, which inevitably raises their privacy concerns. Different from previous literature exploring privacy assurance mechanisms, we employ the stimulus– organism–response framework to investigate how communication tools (environmental stimuli) influence consumers’ perceived control, structural assurance, as well as their service platform- and provider-related privacy concerns (organisms), which subsequently impact new consumers’ intention and regular consumers’ continuance intention to use the on-demand services (behavior responses). The models will be tested based on survey data collected from on-demand service consumers. The potential theoretical contributions and practical implications are discussed

The topological AC effect on noncommutative phase space

The Aharonov-Casher (AC) effect in non-commutative(NC) quantum mechanics is studied. Instead of using the star product method, we use a generalization of Bopp's shift method. After solving the Dirac equations both on noncommutative space and noncommutative phase space by the new method, we obtain the corrections to AC phase on NC space and NC phase space respectively.Comment: 8 pages, Latex fil

Understanding Individual Adoption of Instant Messaging: An Empirical Investigation

The wide diffusion of Instant Messaging (IM) in a voluntary social context calls for studies to examine the value of computer-mediated communication technologies in developing interpersonal relationships. By integrating three interpersonal factors into a model of motivation from the technology acceptance literature, we develop and test a research model to explain an individual\u27s continuous use of IM in keeping and sustaining interpersonal relationships. We find that the behavioral intention to continue using IM was predicated by perceived usefulness, perceived enjoyment, and perceived critical mass. Attachment motivation, relationship commitment, and perceived critical mass were all positively associated with perceived enjoyment. Perceived enjoyment and perceived critical mass had significant effects on perceived usefulness. The results imply that IM is a useful and fun tool for fulfilling one\u27s need for attachment and commitment and for gathering online with one\u27s friends, family members, and others. In addition, perceived enjoyment is the dominant factor explaining grassroots adoption of communication technologies. Finally, it is important to integrate utility factors (usefulness and enjoyment) with social factors in studying communication technologies

A Comparative Study of Individual Acceptance of Instant Messaging in the US and China: A Structural Equation Modeling Approach

The use of computer-mediated communication technology across different countries and cultures is under-investigated in information systems (IS) research. The measurement equivalence issue in cross-cultural IS studies has also not been addressed adequately. This study applies a rigorous structural equation modeling approach (SEM) to compare differences between two groups of college students in the United States and China, by adapting a research model that explains an individual’s use of Instant Messaging (IM). After achieving measurement equivalence across the two groups using SEM, we found that, in their behavioral intention to use IM, Chinese students paid more attention to the effect of perceived enjoyment, while Americans placed more emphasis on perceived usefulness. We found that relationship commitment was more salient in explaining perceived enjoyment for Chinese than for Americans. We also found that the effects of perceived critical mass on perceived enjoyment and perceived usefulness were stronger for Americans than for Chinese. Contrary to our hypothesis, we found that the effect of relationship commitment on perceived usefulness was stronger for Americans than for Chinese. Implications for research and practice are discussed

BES3 time of flight monitoring system

A Time of Flight monitoring system has been developed for BES3. The light source is a 442-443 nm laser diode, which is stable and provides a pulse width as narrow as 50 ps and a peak power as large as 2.6 W. Two optical-fiber bundles with a total of 512 optical fibers, including spares, are used to distribute the light pulses to the Time of Flight counters. The design, operation, and performance of the system are described.Comment: 8 pages 16 figures, submitted to NI

Investigations on the phase formations, properties and single crystal growth in the high-Tc superconducting Ca-Sr-Bi-Cu-O system

We have performed investigations on the Ca-Sr-Bi-Cu-O system with respect to high-Tc superconductivity and structural properties. It is shown that there are two high-Tc superconducting phases in the system, i.e. a 110 K and an 85 K phase. The 85 K phase has a body-centred tetragonal structure with a stoichiometry of CaSr2Bi2Cu2O8. The 110 K phase is closely related to the 85 K phase. It is formed only in a very narrow temperature range and easily deteriorates to the phase with the lower Tc by quenching. Although some samples show a large diamagnetic signal at 110 K in ac-susceptibility measurements, there is still evidence of the presence of the 85 K phase. X-ray diffraction studies, especially in the low-angle region, show a structural relation between these two superconducting phases. The procedures of the preparation and the characterization of the 85 K and 110 K polycrystalline superconducting phases as well as the single crystal growth of the 85 K superconducting phase are described