Yoonjoo Lee

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For quantization of line spectral frequency (LSF), Gaussian mixture model (GMM) based switched split vector quantization (SSVQ) has been reported as the best performing intra-frame coding method. However, GMM-SSVQ partly recovers correlations between the subvectors of split vector quantization (SVQ). In the proposed GMM-SSVQ with the Karhunen-Loève(More)
BACKGROUND Maternal depression is an important public health issue for women, their families, and their employers. Previous studies have examined the impact of leave duration on maternal depression, but none have studied the association between maternal depression and the pace of return to paid work. We examine herein the relationship between maternal(More)
Part of a wider range of investigations to produce generally acceptable standards for measuring affective well-being, time diary surveys have tested several approaches to measuring subjective well-being during diary days. As an alternative to the standard approach of asking a single question about each activity reported in time diary surveys, the 2010(More)
This paper analyzes a special type of social networks, which is called ‘workflow-supported activity-performer affiliation network.’ A workflow model specifies execution sequences of the associated activities and their affiliated relationships with roles, performers, invoked-applications, and relevant data. Especially, these affiliated relationships exhibit(More)
Father's child care time increased substantially between 1965 and 2011. The objective of this paper is to examine whether there was continued change in father care time and whether father time was linked to family structure and partner's employment. Data on the time use of men 18 to 64 living with children under age 18 were drawn from the American Time Use(More)
BACKGROUND An elevated platelet-lymphocyte ratio (PLR) is an indicator for worse outcomes in cancer, but its significance at the end of life remains unclear. OBJECTIVE This study aimed to investigate the value of PLR as an independent prognostic factor in terminally ill cancer patients. METHODS This retrospective cohort study included 312 terminal(More)
Nacre is a natural organic-inorganic hybrid composite, whose hierarchical structure has a complex influence on its high strength. Many structural features have been discovered, which influence the mechanical properties of nacre, and the authors have a particular interest in the role of the asperities and organic-inorganic interactions. In this study, a(More)
Pulmonary neuroendocrine cells (PNECs) are the only innervated airway epithelial cells. To what extent neural innervation regulates PNEC secretion and function is unknown. Here, we discover that neurotrophin 4 (NT4) plays an essential role in mucus overproduction after early life allergen exposure by orchestrating PNEC innervation and secretion of GABA. We(More)