Inverse spectral problems for non-selfadjoint second-order differential operators with Dirichlet boundary conditions

[[abstract]]We study the inverse problem for non-selfadjoint Sturm-Liouville operators on a finite interval with possibly multiple spectra. We prove the uniqueness theorem and obtain constructive procedures for solving the inverse problem along with the necessary and sufficient conditions of its solvability and also prove the stability of the solution.[[journaltype]]國外[[incitationindex]]SCI[[ispeerreviewed]]Y[[booktype]]電子版[[countrycodes]]DE

Generic Subsequence Matching Framework: Modularity, Flexibility, Efficiency

Subsequence matching has appeared to be an ideal approach for solving many problems related to the fields of data mining and similarity retrieval. It has been shown that almost any data class (audio, image, biometrics, signals) is or can be represented by some kind of time series or string of symbols, which can be seen as an input for various subsequence matching approaches. The variety of data types, specific tasks and their partial or full solutions is so wide that the choice, implementation and parametrization of a suitable solution for a given task might be complicated and time-consuming; a possibly fruitful combination of fragments from different research areas may not be obvious nor easy to realize. The leading authors of this field also mention the implementation bias that makes difficult a proper comparison of competing approaches. Therefore we present a new generic Subsequence Matching Framework (SMF) that tries to overcome the aforementioned problems by a uniform frame that simplifies and speeds up the design, development and evaluation of subsequence matching related systems. We identify several relatively separate subtasks solved differently over the literature and SMF enables to combine them in straightforward manner achieving new quality and efficiency. This framework can be used in many application domains and its components can be reused effectively. Its strictly modular architecture and openness enables also involvement of efficient solutions from different fields, for instance efficient metric-based indexes. This is an extended version of a paper published on DEXA 2012.Comment: This is an extended version of a paper published on DEXA 201

The First 4 Weeks Postpartum: The Mother’s Breastfeeding Concerns and Support

Objective: The first four weeks postpartum are critical for establishing successful breastfeeding because many women wean or stop exclusive breastfeeding during this time. This study explored the breastfeeding concerns of mothers during the first 4 weeks postpartum and the support sought for those concerns. Design: A qualitative approach was used. Participants: Four mothers, recruited from central Indiana in 2014 through social media or word of mouth participated in the study. Inclusion criteria were women in their first four to six weeks postpartum, delivered full term healthy babies and were discharged from the hospital breastfeeding. Methods: Semi-structured telephone interviews were conducted and data were analyzed using content analysis. Interview transcripts were first coded. Codes with similar meaning were grouped into categories. Categories sharing similar features were again collapsed into common themes. Results: Concerns identified by mothers fell into the themes: Infant breastfeeding difficulties (latch), breast complications related to breastfeeding (pain and nipple trauma), and maternal concerns related to milk production (infant milk intake and milk supply). Four common themes of support were identified that mothers utilized to alleviate concerns: Professional support, informational support, peer support, and family support. Conclusions: Mothers identified concerns related to themselves and their infants with respect to breastfeeding in the first four weeks postpartum. These concerns indicate the women’s struggle with establishing a successful breastfeeding pattern and one that is compromised by infant latch difficulty, nipple pain and inadequate milk production. Support was sought at multiple levels from health care professionals to social media. The findings suggest that support from health care professionals who provide valuable information is important. However, postpartum women also utilize other support methods when encountering breastfeeding concerns in the first four weeks postpartum. When developing interventions to assist postpartum women with establishing breastfeeding outside of the hospital setting, nurses need to consider using social media and social networks as resources for breastfeeding information and support

MAP detection for impairment compensation in coherent WDM systems

We propose a novel recursive-algorithm based maximum a posteriori probability (MAP) detector in spectrally-efficient coherent wavelength division multiplexing (CoWDM) systems, and investigate its performance in a 1-bit/s/Hz on-off keyed (OOK) system limited by optical-signal-to-noise ratio. The proposed method decodes each sub-channel using the signal levels not only of the particular sub-channel but also of its adjacent sub-channels, and therefore can effectively compensate deterministic inter-sub-channel crosstalk as well as inter-symbol interference arising from narrow-band filtering and chromatic dispersion (CD). Numerical simulation of a five-channel OOK-based CoWDM system with 10Gbit/s per channel using either direct or coherent detection shows that the MAP decoder can eliminate the need for phase control of each optical carrier (which is necessarily required in a conventional CoWDM system), and greatly relaxes the spectral design of the demultiplexing filter at the receiver. It also significantly improves back-to-back sensitivity and CD tolerance of the system

Care Experiences of Women Who Used Opioids and Experienced Fetal or Infant Loss

Objective To explore care experiences of women who used prescription or illicit opioids and experienced fetal or infant loss. Design A qualitative, descriptive design with secondary data analysis. Setting The Fetal and Infant Mortality Review program in an urban Midwestern county in the United States. Participants Eleven women with histories of prescription or illicit opioid use who experienced fetal or infant loss participated in the semistructured telephone or in-person interview portion of the mortality case review. Methods We used thematic analysis to analyze interview data. Results Five themes were identified related to the care experiences of participants throughout pregnancy and fetal/infant loss: Frustration and anger related to not being heard, feeling minimalized; Being overwhelmed with attempts to process and understand medical complications and outcomes; Profound sense of grief and coping with loss; Need to understand why and make difficult decisions; and Placing blame and guilt over death. Conclusion Our findings suggest that women who use opioids and experience fetal or infant loss have complex care, educational, and emotional needs. In the development of interventions for these women, it is important to address their unique and complex circumstances

Thermoelastic Damping in Micro- and Nano-Mechanical Systems

The importance of thermoelastic damping as a fundamental dissipation mechanism for small-scale mechanical resonators is evaluated in light of recent efforts to design high-Q micrometer- and nanometer-scale electro-mechanical systems (MEMS and NEMS). The equations of linear thermoelasticity are used to give a simple derivation for thermoelastic damping of small flexural vibrations in thin beams. It is shown that Zener's well-known approximation by a Lorentzian with a single thermal relaxation time slightly deviates from the exact expression.Comment: 10 pages. Submitted to Phys. Rev.

Direct Intracellular Delivery of Cell Impermeable Probes of Protein Glycosylation Using Nanostraws

Bioorthogonal chemistry is an effective tool for elucidating metabolic pathways and measuring cellular activity, yet its use is currently limited by the difficulty of getting probes past the cell membrane and into the cytoplasm, especially if more complex probes are desired. Here we present a simple and minimally perturbative technique to deliver functional probes of glycosylation into cells by using a nanostructured “nanostraw” delivery system. Nanostraws provide direct intracellular access to cells through fluid conduits that remain small enough to minimize cell perturbation. First, we demonstrate that our platform can deliver an unmodified azidosugar, N-azidoacetylmannosamine, into cells with similar effectiveness to a chemical modification strategy (peracetylation). We then show that the nanostraw platform enables direct delivery of an azidosugar modified with a charged uridine diphosphate group (UDP) that prevents intracellular penetration, thereby bypassing multiple enzymatic processing steps. By effectively removing the requirement for cell permeability from the probe, the nanostraws expand the toolbox of bioorthogonal probes that can be used to study biological processes on a single, easy-to-use platform

Choreo: network-aware task placement for cloud applications

Cloud computing infrastructures are increasingly being used by network-intensive applications that transfer significant amounts of data between the nodes on which they run. This paper shows that tenants can do a better job placing applications by understanding the underlying cloud network as well as the demands of the applications. To do so, tenants must be able to quickly and accurately measure the cloud network and profile their applications, and then use a network-aware placement method to place applications. This paper describes Choreo, a system that solves these problems. Our experiments measure Amazon's EC2 and Rackspace networks and use three weeks of network data from applications running on the HP Cloud network. We find that Choreo reduces application completion time by an average of 8%-14% (max improvement: 61%) when applications are placed all at once, and 22%-43% (max improvement: 79%) when they arrive in real-time, compared to alternative placement schemes.National Science Foundation (U.S.) (Grant 0645960)National Science Foundation (U.S.) (Grant 1065219)National Science Foundation (U.S.) (Grant 1040072

Superconductivity from D3/D7: Holographic Pion Superfluid

We show that a D3/D7 system (at zero quark mass limit) at finite isospin chemical potential goes through a superconductor (superfluid) like phase transition. This is similar to a flavored superfluid phase studied in QCD literature, where mesonic operators condensate. We have studied the frequency dependent conductivity of the condensate and found a delta function pole in the zero frequency limit. This is an example of superconductivity in a string theory context. Consequently we have found a superfluid/supercurrent type solution and studied the associated phase diagram. The superconducting transition changes from second order to first order at a critical superfluid velocity. We have studied various properties of the superconducting system like superfluid density, energy gap, second sound etc. We investigate the possibility of the isospin chemical potential modifying the embedding of the flavor branes by checking whether the transverse scalars also condense at low temperature. This however does not seem to be the case.Comment: 18 pages, 8 figures, revtex