8,109 research outputs found
Resonator-Aided Single-Atom Detection on a Microfabricated Chip
We use an optical cavity to detect single atoms magnetically trapped on an
atom chip. We implement the detection using both fluorescence into the cavity
and reduction in cavity transmission due to the presence of atoms. In
fluorescence, we register 2.0(2) photon counts per atom, which allows us to
detect single atoms with 75% efficiency in 250 microseconds. In absorption, we
measure transmission attenuation of 3.3(3)% per atom, which allows us to count
small numbers of atoms with a resolution of about 1 atom.Comment: 4.1 pages, 5 figures, and submitted to Physical Review Letter
Robust Recovery of Subspace Structures by Low-Rank Representation
In this work we address the subspace recovery problem. Given a set of data
samples (vectors) approximately drawn from a union of multiple subspaces, our
goal is to segment the samples into their respective subspaces and correct the
possible errors as well. To this end, we propose a novel method termed Low-Rank
Representation (LRR), which seeks the lowest-rank representation among all the
candidates that can represent the data samples as linear combinations of the
bases in a given dictionary. It is shown that LRR well solves the subspace
recovery problem: when the data is clean, we prove that LRR exactly captures
the true subspace structures; for the data contaminated by outliers, we prove
that under certain conditions LRR can exactly recover the row space of the
original data and detect the outlier as well; for the data corrupted by
arbitrary errors, LRR can also approximately recover the row space with
theoretical guarantees. Since the subspace membership is provably determined by
the row space, these further imply that LRR can perform robust subspace
segmentation and error correction, in an efficient way.Comment: IEEE Trans. Pattern Analysis and Machine Intelligenc
Examining Stakeholder Perspectives: Process, Performance and Progress of the Age-Friendly Taiwan Program.
Since Taiwans age-friendly city (AFC) program was launched in 2012, the central government has provided various resources to the countrys 22 local authorities, including budgetary support, policy advocacy, and consultation from a team of experts. This study examines stakeholder perspectives on the process, performance, and outcome of the AFC program. A 53-item questionnaire was developed based on the World Health Organization (WHO) guideline, including mechanisms and processes (20 items), outcome evaluations (23 items), and resource integration (10 items). There was a great difference found among scores between facilitators and experts for inter-exchange experience with local and international cities (40%) and monitor and revise indicators (37%) in mechanisms and processes, evaluate performance of indicators and action plans (37%) in outcome evaluations, and interaction between government and community (46%) and interaction between civil organization and senior society (39%) in resource integration. Clearly, facilitators showed overly optimistic assessments in AFC mechanisms and processes, outcome evaluation, and resource integration. The results showed disconnect between experts expectations versus actual practice conducted by facilitators. Implications of these findings are to integrate top down expectations with the realities of bottom up practice to design more realistic evaluations; continue to educate stakeholders about design, implementation and evaluation; and further integrate resources from government, civil organizations, and community
Managing Triads in a Military Avionics Service Maintenance Network in Taiwan
Purpose – The purpose of this paper is to investigate how different types of
triad structures, and the management mechanisms adopted by the focal company,
affect cooperative performance. Design/methodology/approach – This paper uses a
social network perspective to examine the triad management phenomenon in the
military avionics maintenance context, which is closely associated with the
field of operations management. Findings – This paper demonstrates that
different triad structures and management mechanisms influence perceived
cooperative performance. Four main findings emerged: in a triad, a firm playing
a bridging role perceives higher cooperative performance than when playing a
peripheral role in the triad or being located in a fully connected triad. When a
firm plays the bridging role in a triad, and has a high level of trust, this
leads to higher perceived cooperative performance. When a firm plays a
peripheral role in a triad, high levels of coordination mechanism combined with
high levels of trust result in higher levels of perceived cooperative
performance. In a fully linked triad, when the coordination mechanism is well
developed, the level of trust is high, so that the resulting level of perceived
cooperation is high. Originality/value – This paper extends the knowledge of
triad management by providing an in-depth study of a well-defined network
setting with exceptionally high-level access to the most senior executives. In
practice, this paper shows how to manage differen
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