Distribution of user-perceived usefulness of four presentation styles of opinion summarization

In this study, four opinion summarization styles were compared under an experimental environment. Thirty four participants sorted thirty two cards into five usefulness categories. Every eight cards belong to one presentation style. It was found that the users spent the shortest time on cards in “not at all useful” category. The time of viewing “extremely useful” cards was also shorter than that of “somewhat useful”, “useful”, and “very useful” cards. This result can be explained with the components of the usefulness categories. Tag clouds and Aspect oriented sentiments needed less time to view. They are the major styles in “not at all useful” and “extremely useful”. Paragraph summaries and Group samples requested more time and they took at least 50% in “somewhat useful”, “useful”, and “very useful”. The findings are consistent with our previous results

Hydrothermally synthesized CeO2 nanowires for H2S sensing at room temperature

CeO2 nanowires were synthesized using a facile hydrothermal process without any surfactant, and their morphological, structural and gas sensing properties were systematically investigated. The CeO2 nanowires with an average diameter of 12.5 nm had a face-centered cubic fluorite structure and grew along [111] of CeO2. At the room temperature of 25 °C, hydrogen sulfide (H2S) gas sensor based on the CeO2 nanowires showed excellent sensitivity, low detection limit (50 ppb), and short response and recovery time (24 s and 15 s for 50 ppb H2S, respectively)

Support spatial awareness: Collaborative navigation in a virtual environment.

Collaboration in a collaborative virtual environment (CVE) presents many challenges as well as opportunities for interface design. For many tasks in CVE, the ability of the users to navigate to a desired location while maintaining spatial awareness of their surroundings is the prerequisite. This work proposed a problem space specification for the collaborative navigation task, characterized several important task parameters, and constructed a design space to support spatial awareness in typical CVE application domains. An experimental paradigm and a task environment were built to test several designs that aim at enhancing spatial awareness in a dyad collaborative navigation task. In Experiment 1, three basic perspective displays: First Person, Tethered and Third Person were compared. The First Person display proved to be the best in enabling good instruction-giving, whereas the Third Person condition resulted in the best search. Three different ways of integrating these three perspective displays were tested in Experiment 2. Although These integrations did not outperform the First Person condition, the advantage of user active control of perspective was observed. These results are consistent with the theoretical analysis based on our problem space specification. Guided by the design space formulation, two machine-controlled awareness aids: Automatic View Switch and Overlay were developed and tested in Experiment 3. The results indicated that these were superior in navigation performance without reducing the spatial environment learning. Another part of the study concerns the communication process between participants. The notion that a team knowledge construct is critical for collaboration was verified within the context of the experimental setting.Ph.D.Applied SciencesCognitive psychologyCommunication and the ArtsComputer scienceInformation sciencePsychologyUniversity of Michigan, Horace H. Rackham School of Graduate Studieshttp://deepblue.lib.umich.edu/bitstream/2027.42/123986/2/3106193.pd

Collaborative Applications of Zoomable User Interface 1 Collaborative Applications of Zoomable User Interface

Recent advancements in computer and communication technologies have revolutionized how computers are used. One of the application domains that are gainin

Bias Towards Regular Configuration in 2D Pointing

ABSTRACT Extending Fitts' law to more than one dimension has been recognized as having important implications for HCI. In spite of the progress made over the years, however, it is still far from a resolved issue. Our work approaches this problem from the viewpoint of a configuration space, which has served as a useful conceptual framework for understanding human preference in perception. Notably, human are found to be biased towards regular configurations. In this work, we extended the configuration space framework to the domain of motor behavior, analyzed 2D pointing, and developed five models to account for the performance. An extensive experiment was conducted to measure the fit of the derived models and that of three previous models. Consistent with our hypothesis, the model reflecting a bias towards regular configuration was found to have the most satisfactory fit with the data. The paper concludes with discussions on improving understanding of Fitts' law and the implications for HCI