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  1. Fast generation of personalized head-related transfer functions is essential for rendering spatial audio. In this paper we propose to generate head-related transfer functions using a single graphics processing unit (GPU). We optimize the implementation of the conventional boundary element solver on a GPU. The simulation of a single frequency can be completed in seconds. A psychoacoustic experiment is conducted to study the perceptual performance of the computed HRTFs. In general, perceptual accuracy in the back is better than that in the front.
  2. Abstract SPT-3G is the third survey receiver operating on the South Pole Telescope dedicated to high-resolution observations of the cosmic microwave background (CMB). Sensitive measurements of the temperature and polarization anisotropies of the CMB provide a powerful data set for constraining cosmology. Additionally, CMB surveys with arcminute-scale resolution are capable of detecting galaxy clusters, millimeter-wave bright galaxies, and a variety of transient phenomena. The SPT-3G instrument provides a significant improvement in mapping speed over its predecessors, SPT-SZ and SPTpol. The broadband optics design of the instrument achieves a 430 mm diameter image plane across observing bands of 95, 150, andmore »220 GHz, with 1.2′ FWHM beam response at 150 GHz. In the receiver, this image plane is populated with 2690 dual-polarization, trichroic pixels (∼16,000 detectors) read out using a 68× digital frequency-domain multiplexing readout system. In 2018, SPT-3G began a multiyear survey of 1500 deg 2 of the southern sky. We summarize the unique optical, cryogenic, detector, and readout technologies employed in SPT-3G, and we report on the integrated performance of the instrument.« less
    Free, publicly-accessible full text available February 1, 2023
  3. Crowd-based open innovation communities have received increasing attention, based on the premise that leveraging the power and diversity of the crowd can lead to innovative outcomes. However, we still know little about how work is coordinated over time in this context, especially as the innovation process moves from idea generation to elaboration. Based on literature and theories of coordination and collaboration in traditional creative contexts and on emergent evidence from research on crowd work, we develop hypotheses about the unique interaction patterns that characterize co-creation and how these patterns impact, over time, submission quality. To test our hypotheses, we conductedmore »a study of a crowd-based open innovation platform. We found that, in general, the diversity of contributors increased over time, but for high quality submissions, the number of contributors decreased and a small group of involved people became more dominant in providing feedback. Further, we observe that the creators of more successful submissions, while not dominating the discussion, were particularly engaged in the discussions in later stages. Our work contributes to understanding the temporal dynamics in open innovation communities by providing evidence that successful interaction patterns vary depending on the phase of the project.« less
  4. Free, publicly-accessible full text available October 1, 2022