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Keun-hyeung Lee – One of the best experts on this subject based on the ideXlab platform.

  • Selective and Sensitive Detection of Heavy Metal Ions in 100% Aqueous Solution and Cells with a Fluorescence Chemosensor Based on Peptide Using Aggregation-Induced Emission
    Analytical Chemistry, 2016
    Co-Authors: Lok Nath Neupane, Heon Joo Park, Keun-hyeung Lee

    Abstract:

    A fluorescent peptidyl chemosensor for the detection of heavy metal ions in aqueous solution as well as in cells was synthesized on the basis of the peptide receptor for the metal ions using an aggregation-induced emission fluorophore. The peptidyl chemosensor (1) bearing tetraphenylethylene fluorophore showed an exclusively selective turn-on response to Hg2+ among 16 metal ions in aqueous buffered solution containing NaCl. The peptidyl chemosensor complexed Hg2+ ions and then aggregated in aqueous buffered solution, resulting in the significant enhancement (OFF-On) of emissions at around 470 nm. The fluorescent sensor showed a highly sensitive response to Hg2+, and about 1.0 equiv of Hg2+ was enough for the saturation of the emission intensity change. The detection limit (5.3 nM, R2 = 0.99) of 1 for Hg2+ ions was lower than the maximum Allowable Level of Hg2+ in drinking water by EPA. Moreover, the peptidyl chemosensor penetrated live cells and detected intracellular Hg2+ ions by the turn-on response.

  • Highly sensitive and selective detection of Al(III) ions in aqueous buffered solution with fluorescent peptide-based sensor.
    Bioorganic & Medicinal Chemistry Letters, 2016
    Co-Authors: Gi Won Hwang, Keun-hyeung Lee

    Abstract:

    Abstract A fluorescent sensor based on a tripeptide (SerGluGlu) with a dansyl fluorophore detected selectively Al(III) among 16 metal ions in aqueous buffered solutions without any organic cosolvent. The peptide-based sensor showed a highly sensitive turn on response to aluminium ion with high binding affinity (1.84 × 104 M−1) in aqueous buffered solutions. The detection limit (230 nM, 5.98 ppb) of the peptide-based sensor was much lower than the maximum Allowable Level (7.41 μM) of aluminium ions in drinking water demanded by EPA. The binding mode of the peptide sensor with aluminium ions was characterized using ESI mass spectrometry, NMR titration, and pH titration experiments.

  • Efficient ensemble system based on the copper binding motif for highly sensitive and selective detection of cyanide ions in 100% aqueous solutions by fluorescent and colorimetric changes.
    Analytical Chemistry, 2015
    Co-Authors: Kwan Ho Jung, Keun-hyeung Lee

    Abstract:

    A peptide-based ensemble for the detection of cyanide ions in 100% aqueous solutions was designed on the basis of the copper binding motif. 7-Nitro-2,1,3-benzoxadiazole-labeled tripeptide (NBD-SSH, NBD-SerSerHis) formed the ensemble with Cu2+, leading to a change in the color of the solution from yellow to orange and a complete decrease of fluorescence emission. The ensemble (NBD-SSH–Cu2+) sensitively and selectively detected a low concentration of cyanide ions in 100% aqueous solutions by a colorimetric change as well as a fluorescent change. The addition of cyanide ions instantly removed Cu2+ from the ensemble (NBD-SSH–Cu2+) in 100% aqueous solutions, resulting in a color change of the solution from orange to yellow and a “turn-on” fluorescent response. The detection limits for cyanide ions were lower than the maximum Allowable Level of cyanide ions in drinking water set by the World Health Organization. The peptide-based ensemble system is expected to be a potential and practical way for the detection …

Geoffrey R Walker – One of the best experts on this subject based on the ideXlab platform.

  • saidi constrained economic planning and utilization of central storage in rural distribution networks
    IEEE Systems Journal, 2019
    Co-Authors: A Narimani, Ghavameddin Nourbakhsh, Ali Arefi, Gerard Ledwich, Geoffrey R Walker

    Abstract:

    This paper forms a framework for allocating a central electric energy storage (EES) in discrete communities, forming as segmentations along the rural feeders, where the installation of cross connects are not economic or even feasible. In this framework, EESs that centrally can be installed in each community are owned and operated by an aggregator/retailer, trading bidirectional energy transactions with both the grid and the customers. The objective is to find optimum investment in storage capacity in rural feeders for minimum annual energy purchase cost using energy arbitrage opportunities, while maintaining an Allowable Level of system average interruption duration index (SAIDI). As a part of EES sizing and siting optimization in this approach, annual hourly network data are utilized for charge/discharge scheduling and constraint, and for system reliability assessment—using the k-means clustering technique. This method is applied to a rural network in Queensland, Australia, and the results are examined to show the effectiveness of this method.

Toshiyuki Okano – One of the best experts on this subject based on the ideXlab platform.

  • Necessary accuracy for early reflections in sound field auralization
    Journal of the Acoustical Society of America, 1993
    Co-Authors: Toshiyuki Okano

    Abstract:

    Necessary accuracy for early reflection Levels was investigated in order to derive criteria to verify the accuracy of a sound field simulator. Early reflections are the most important in controlling the subjective impression of a room’s sound field. The accuracy of the sound field simulator depends primarily on the accuracy of early reflections. The just‐noticeable Level difference (jnld) of early reflections defines the maximum of Allowable Level difference between real and simulated reflections. Also, the masked threshold Level (MTL) of early reflections defines the Level of the smallest reflections which a simulator should generate. However, jnld and MTL of early reflections depend on the sound field’s configuration. It is desirable that criteria are independent of the configuration of the sound field. The jnld and MTL were measured for lateral and ceiling reflections in various types of rooms with simulated sound fields. Measured jnlds and MTLs were converted into the difference in objective parameter…

  • Necessary accuracy for early reflections in sound field auralization
    Journal of the Acoustical Society of America, 1993
    Co-Authors: Toshiyuki Okano

    Abstract:

    Necessary accuracy for early reflection Levels was investigated in order to derive criteria to verify the accuracy of a sound field simulator. Early reflections are the most important in controlling the subjective impression of a room’s sound field. The accuracy of the sound field simulator depends primarily on the accuracy of early reflections. The just‐noticeable Level difference (jnld) of early reflections defines the maximum of Allowable Level difference between real and simulated reflections. Also, the masked threshold Level (MTL) of early reflections defines the Level of the smallest reflections which a simulator should generate. However, jnld and MTL of early reflections depend on the sound field’s configuration. It is desirable that criteria are independent of the configuration of the sound field. The jnld and MTL were measured for lateral and ceiling reflections in various types of rooms with simulated sound fields. Measured jnlds and MTLs were converted into the difference in objective parameter…