The situation of wind speed and temperature is analyzed by utilizing the observational meteorolog... more The situation of wind speed and temperature is analyzed by utilizing the observational meteorology data from the Beijing 325-m meteorology tower of the Institute of Atmospheric Physic of Chinese Academy of Sciences.The analysis indicates that the relative wind speed is in decrease,and at lower levels the decrease is even more apparent.The vertical increasing rate of wind speed,calculated by making a linear fitting of the wind speed profile,shows an increase trend at both the lower levels under 100 m and the levels above.The vertical decreasing rate of temperature,which is generated from the temperature profile,is in increase over those years,indicating the urbanization influence on the thermodynamic structure of boundary layer.By utilizing the wind speed profile in a nearly neutral stratification,the aerodynamic parameters of the boundary layer are calculated based on the Monin-Obukhov similarity theory,showing an apparent increasing trend of the roughness length and zero-plane displacement.The analysis also shows that the relationship between friction wind speed and average wind speed is linear,and the increasing trend of friction wind speed with the average wind speed increases becomes more and more apparent.The results of this paper can be referenced by the researches of urbanization and urban environment,and can also provide potential parameterization for the boundary layer model as well as the regional climate model.
We present a novel approach to dataset search and exploration. Cell-centric indexing is a unique ... more We present a novel approach to dataset search and exploration. Cell-centric indexing is a unique indexing strategy that enables a powerful, new interface. The strategy treats individual cells of a table as the indexed unit, and combining this with a number of structure-specic elds enables queries that cannot be answered by a traditional indexing approach. Our interface provides users with an overview of a dataset repository, and allows them to eciently use various facets to explore the collection and identify datasets that match their interests.
A critical determinant of message interactivity is the presence of contingency, that is, the mess... more A critical determinant of message interactivity is the presence of contingency, that is, the messages we receive are contingent upon the messages we send, leading to a threaded loop of interdependent messages. While this “conversational ideal” is easily achieved in face-to-face and computer-mediated communications (CMC), imbuing contingency in human-computer interaction (HCI) is a challenge. We propose two interface features—interaction history and synchronous chat—for increasing perceptions of contingency, and therefore user engagement. We test it with a five-condition, between-participants experiment ( N = 110) on a movie search site. Data suggest that interaction history can indeed heighten perceptions of contingency and dialogue, but is perceived as less interactive than chatting. However, the chat function does not appreciably increase perceived contingency or user engagement, both of which are shown to mediate the effects of message interactivity on attitudes toward the site. ...
Cyberpsychology: Journal of Psychosocial Research on Cyberspace, 2016
With the rise of social networking sites (SNSs), individuals not only disclose personal informati... more With the rise of social networking sites (SNSs), individuals not only disclose personal information but also share private information concerning others online. While shared information is co-constructed by self and others, personal and collective privacy boundaries become blurred. Thus there is an increasing concern over information privacy beyond the individual perspective. However, limited research has empirically examined if individuals are concerned about privacy loss not only of their own but their social ties’; nor is there an established instrument for measuring the collective aspect of individuals’ privacy concerns. In order to address this gap in existing literature, we propose a conceptual framework of individuals’ collective privacy concerns in the context of SNSs. Drawing on the Communication Privacy Management (CPM) theory (Petronio, 2002), we suggest three dimensions of collective privacy concerns, namely, collective information access, control and diffusion. This is ...
Proceedings of the 2011 annual conference extended abstracts on Human factors in computing systems - CHI EA '11, 2011
Modern interfaces offer users a wider range of interaction modalities beyond pointing and clickin... more Modern interfaces offer users a wider range of interaction modalities beyond pointing and clicking, such as dragging, sliding, zooming, and flipping through images. But, do they offer any distinct psychological advantages? We address this question with an experiment (N = 128) testing the relative contributions made by six interaction modalities (zoom-inout, drag, slide, mouse-over, cover-flow and click-to-download) to user engagement with identical content. Data suggest that slide is better at aiding memory than the other modalities, whereas cover-flow and mouse-over generate more user actions. Mouse-over, click-to-download, and zoom-inout tend to foster more favorable attitudes among power users, whereas cover-flow and slide generate more positive attitudes among non-power users. Design implications are discussed.
The situation of wind speed and temperature is analyzed by utilizing the observational meteorolog... more The situation of wind speed and temperature is analyzed by utilizing the observational meteorology data from the Beijing 325-m meteorology tower of the Institute of Atmospheric Physic of Chinese Academy of Sciences.The analysis indicates that the relative wind speed is in decrease,and at lower levels the decrease is even more apparent.The vertical increasing rate of wind speed,calculated by making a linear fitting of the wind speed profile,shows an increase trend at both the lower levels under 100 m and the levels above.The vertical decreasing rate of temperature,which is generated from the temperature profile,is in increase over those years,indicating the urbanization influence on the thermodynamic structure of boundary layer.By utilizing the wind speed profile in a nearly neutral stratification,the aerodynamic parameters of the boundary layer are calculated based on the Monin-Obukhov similarity theory,showing an apparent increasing trend of the roughness length and zero-plane displacement.The analysis also shows that the relationship between friction wind speed and average wind speed is linear,and the increasing trend of friction wind speed with the average wind speed increases becomes more and more apparent.The results of this paper can be referenced by the researches of urbanization and urban environment,and can also provide potential parameterization for the boundary layer model as well as the regional climate model.
We present a novel approach to dataset search and exploration. Cell-centric indexing is a unique ... more We present a novel approach to dataset search and exploration. Cell-centric indexing is a unique indexing strategy that enables a powerful, new interface. The strategy treats individual cells of a table as the indexed unit, and combining this with a number of structure-specic elds enables queries that cannot be answered by a traditional indexing approach. Our interface provides users with an overview of a dataset repository, and allows them to eciently use various facets to explore the collection and identify datasets that match their interests.
A critical determinant of message interactivity is the presence of contingency, that is, the mess... more A critical determinant of message interactivity is the presence of contingency, that is, the messages we receive are contingent upon the messages we send, leading to a threaded loop of interdependent messages. While this “conversational ideal” is easily achieved in face-to-face and computer-mediated communications (CMC), imbuing contingency in human-computer interaction (HCI) is a challenge. We propose two interface features—interaction history and synchronous chat—for increasing perceptions of contingency, and therefore user engagement. We test it with a five-condition, between-participants experiment ( N = 110) on a movie search site. Data suggest that interaction history can indeed heighten perceptions of contingency and dialogue, but is perceived as less interactive than chatting. However, the chat function does not appreciably increase perceived contingency or user engagement, both of which are shown to mediate the effects of message interactivity on attitudes toward the site. ...
Cyberpsychology: Journal of Psychosocial Research on Cyberspace, 2016
With the rise of social networking sites (SNSs), individuals not only disclose personal informati... more With the rise of social networking sites (SNSs), individuals not only disclose personal information but also share private information concerning others online. While shared information is co-constructed by self and others, personal and collective privacy boundaries become blurred. Thus there is an increasing concern over information privacy beyond the individual perspective. However, limited research has empirically examined if individuals are concerned about privacy loss not only of their own but their social ties’; nor is there an established instrument for measuring the collective aspect of individuals’ privacy concerns. In order to address this gap in existing literature, we propose a conceptual framework of individuals’ collective privacy concerns in the context of SNSs. Drawing on the Communication Privacy Management (CPM) theory (Petronio, 2002), we suggest three dimensions of collective privacy concerns, namely, collective information access, control and diffusion. This is ...
Proceedings of the 2011 annual conference extended abstracts on Human factors in computing systems - CHI EA '11, 2011
Modern interfaces offer users a wider range of interaction modalities beyond pointing and clickin... more Modern interfaces offer users a wider range of interaction modalities beyond pointing and clicking, such as dragging, sliding, zooming, and flipping through images. But, do they offer any distinct psychological advantages? We address this question with an experiment (N = 128) testing the relative contributions made by six interaction modalities (zoom-inout, drag, slide, mouse-over, cover-flow and click-to-download) to user engagement with identical content. Data suggest that slide is better at aiding memory than the other modalities, whereas cover-flow and mouse-over generate more user actions. Mouse-over, click-to-download, and zoom-inout tend to foster more favorable attitudes among power users, whereas cover-flow and slide generate more positive attitudes among non-power users. Design implications are discussed.
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Papers by Haiyan Jia