276 research outputs found
aIRPLane: An information retrieval pattern language
Interaction patterns and pattern languages have been discussed for years in HCI literature
yet there have been few empirical studies conducted. We describe aIRPLane: An
Information Retrieval Pattern Language, its discovery, and the experimental design we
use to examine its impact on the design of information retrieval interfaces. The results of
a pattern sorting exercise are the focus of this poster
Design rationale: the rationale and the barriers
ABSTRACT One goal of design rationale systems is to support designers by providing a means to record and communicate the argumentation and reasoning behind the design process. However, there are several inherent limitations to developing systems that effectively capture and utilize design rationale. The dynamic and contextual nature of design and our inability to exhaustively analyze all possible design issues results in cognitive, capture, retrieval, and usage limitations. In addition, there are the organizational limitations that ensue when systems are deployed. In this paper we analyze these issues in terms of current perspectives in design theory and describe the implications to design research. We discuss the barriers to effective design rationale in terms of three major goals: reflection, communication, and analysis of design processes. We then suggest alternate means to achieve these goals that can be used with or instead of design rationale systems. Author Keywords Design rationale, theories of design, interactive systems design. ACM Classification Keywords H5.m. Information interfaces and presentation (e.g., HCI): Miscellaneous
Eye-candy or practical: Designing with user-interaction (UI) patterns
Usability and functionality, communicated through a software product interface, share a
synergistic relationship. Both contribute substantially to Quality-in-Use of the product.
While it’s important to ensure the User-Interface delivers necessary functionality, it’s
crucial that the interface is also usable. Software- Requirements engineering and Human
Computer Interaction (HCI) each offer their expertise in addressing such demands. But,
lack of design language or vocabulary impedes communication between the two
synergistic communities.
In order to share interaction design knowledge, HCI design community has proposed
User-interaction (UI) Patterns as a suitable boundary object or language, which could be
understood both by HCI and SE communities. It has been argued that UI patterns are
sufficiently richer than User-Interface guidelines conveying—what, how and when a
particular UI-Pattern is used.
In spite of a growing interest in UI-Patterns, questions about the usability and usefulness
of UI-Patterns are still unanswered. Our study empirically evaluates the suitability of UIPatterns
as a boundary object between HCI and SE by comparing:
- how UI Patterns are interpreted and applied by the two communities;
- what is the role played by UI-Patterns in communication;
- if UI-patterns help rationalize and resolve design decisions.
In doing so, we evaluate the usability—do other communities understand UI-patterns
well enough to use them, and usefulness—what are the benefits of using UI-Patterns in
design
How do design and evaluation interrelate in HCI research?
Presented at DIS 2006, the Symposium on Designing Interactive Systems, the 6th ACM conference on Designing Interactive Systems, University Park, PA, DOI: http://dx.doi.org/10.1145/1142405.1142421Human-Computer Interaction (HCI) is defined by the Association for Computing Machinery (ACM) Special Interest Group on Computer-Human Interaction (SIGCHI) as “a discipline concerned with the design, evaluation, and implementation of interactive computing systems for human use and with the study of the major phenomenon surrounding them” [18]. In HCI there are authors that focus more on designing for usability and there are authors that focus more on evaluating usability. The relationship between these communities is not really clear. We use author cocitation analysis, multivariate techniques, and visualization tools to explore the relationships between these communities. The results of the analysis revealed seven clusters that could be identified as Design Theory and Complexity, Design Rationale, Cognitive Theories and Models, Cognitive Engineering, Computer-Supported Cooperative Work (CSCW), Participatory Design, and User-Centered Design
Measuring the Photon Helicity in Radiative B Decays
We propose a way of measuring the photon polarization in radiative B decays
into K resonance states decaying to K\pi\pi, which can test the Standard Model
and probe new physics. The photon polarization is shown to be measured by the
up-down asymmetry of the photon direction relative to the K\pi\pi decay plane
in the K resonance rest frame. The integrated asymmetry in K_1(1400)\to
K\pi\pi, calculated to be 0.34\pm 0.05 in the Standard Model, is measurable at
currently operating B factories.Comment: 4 pages, final version to appear in Physical Review Letter
Designing a knowledge management approach for the CAMRA Community of Science
Practical Aspects of Knowledge Management, pp. 315-325.CAMRA (Center for Advancing Microbial Risk Assessment) gathers a
community of scientists that investigate several stages in the life cycle of biological
agents of concern. This paper describes the knowledge management (KM) approach
adopted for CAMRA’s community of scientists. The approach includes knowledge
facilitators, a web- and repository-based KM system, and use-centered design. The
approach relies on a KM methodology that addresses the most common causes of
failures in KM approaches that was complemented with a use-centered design
methodology. The resulting combined methodology represents a unique way of
implementing KM to promote knowledge sharing and collaboration. We describe the
principles in our design and the initial steps undertaken to implement it for CAMRA.
We conclude by laying out our future steps
Spectroscopy of Broad Line Blazars from 1LAC
We report on optical spectroscopy of 165 Flat Spectrum Radio Quasars (FSRQs)
in the Fermi 1LAC sample, which have helped allow a nearly complete study of
this population. Fermi FSRQ show significant evidence for non-thermal emission
even in the optical; the degree depends on the gamma-ray hardness. They also
have smaller virial estimates of hole mass than the optical quasar sample. This
appears to be largely due to a preferred (axial) view of the gamma-ray FSRQ and
non-isotropic (H/R ~ 0.4) distribution of broad-line velocities. Even after
correction for this bias, the Fermi FSRQ show higher mean Eddington ratios than
the optical population. A comparison of optical spectral properties with Owens
Valley Radio Observatory radio flare activity shows no strong correlation.Comment: Accepted for publication in Ap
Blazars in the Fermi Era: The OVRO 40-m Telescope Monitoring Program
The Large Area Telescope (LAT) aboard the Fermi Gamma-ray Space Telescope
provides an unprecedented opportunity to study gamma-ray blazars. To capitalize
on this opportunity, beginning in late 2007, about a year before the start of
LAT science operations, we began a large-scale, fast-cadence 15 GHz radio
monitoring program with the 40-m telescope at the Owens Valley Radio
Observatory (OVRO). This program began with the 1158 northern (declination>-20
deg) sources from the Candidate Gamma-ray Blazar Survey (CGRaBS) and now
encompasses over 1500 sources, each observed twice per week with a ~4 mJy
(minimum) and 3% (typical) uncertainty. Here, we describe this monitoring
program and our methods, and present radio light curves from the first two
years (2008 and 2009). As a first application, we combine these data with a
novel measure of light curve variability amplitude, the intrinsic modulation
index, through a likelihood analysis to examine the variability properties of
subpopulations of our sample. We demonstrate that, with high significance
(7-sigma), gamma-ray-loud blazars detected by the LAT during its first 11
months of operation vary with about a factor of two greater amplitude than do
the gamma-ray-quiet blazars in our sample. We also find a significant (3-sigma)
difference between variability amplitude in BL Lacertae objects and
flat-spectrum radio quasars (FSRQs), with the former exhibiting larger
variability amplitudes. Finally, low-redshift (z<1) FSRQs are found to vary
more strongly than high-redshift FSRQs, with 3-sigma significance. These
findings represent an important step toward understanding why some blazars emit
gamma-rays while others, with apparently similar properties, remain silent.Comment: 23 pages, 24 figures. Submitted to ApJ
Remote sensing for cost-effective blue carbon accounting
Blue carbon ecosystems (BCE) include mangrove forests, tidal marshes, and seagrass meadows, all of which are currently under threat, putting their contribution to mitigating climate change at risk. Although certain challenges and trade-offs exist, remote sensing offers a promising avenue for transparent, replicable, and cost-effective accounting of many BCE at unprecedented temporal and spatial scales. The United Nations Framework Convention on Climate Change (UNFCCC) has issued guidelines for developing blue carbon inventories to incorporate into Nationally Determined Contributions (NDCs). Yet, there is little guidance on remote sensing techniques for monitoring, reporting, and verifying blue carbon assets. This review constructs a unified roadmap for applying remote sensing technologies to develop cost-effective carbon inventories for BCE – from local to global scales. We summarise and discuss (1) current standard guidelines for blue carbon inventories; (2) traditional and cutting-edge remote sensing technologies for mapping blue carbon habitats; (3) methods for translating habitat maps into carbon estimates; and (4) a decision tree to assist users in determining the most suitable approach depending on their areas of interest, budget, and required accuracy of blue carbon assessment. We designed this work to support UNFCCC-approved IPCC guidelines with specific recommendations on remote sensing techniques for GHG inventories. Overall, remote sensing technologies are robust and cost-effective tools for monitoring, reporting, and verifying blue carbon assets and projects. Increased appreciation of these techniques can promote a technological shift towards greater policy and industry uptake, enhancing the scalability of blue carbon as a Natural Climate Solution worldwide
Charmless decays using flavor SU(3) symmetry
The decays of mesons to a pair of charmless pseudoscalar () mesons are
analyzed within a framework of flavor SU(3). Symmetry breaking is taken into
account in tree () amplitudes through ratios of decay constants; exact SU(3)
is assumed elsewhere. Acceptable fits to and
branching ratios and CP asymmetries are obtained with tree, color-suppressed
(), penguin (), and electroweak penguin () amplitudes. Crucial
additional terms for describing processes involving and include
a large flavor-singlet penguin amplitude () as proposed earlier and a
penguin amplitude associated with intermediate and quarks. For
the mode a term associated with intermediate
and quarks also may be needed. Values of the weak phase are
obtained consistent with an earlier analysis of decays, where
denotes a vector meson, and with other analyses of CKM parameters.Comment: 26 pages, 1 figure. To be submitted to Phys. Rev. D. Reference
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