243 research outputs found
Complicated narratives of “Korean-ness”: Towards strategic provisionality in parental involvement
The purpose of this paper is to advance the discourse on parental involvement drawing from Butlerian notion of strategic provisionality. In developing a new approach to understanding cultural differences and their relation to Korean parental involvement, the authors analyze qualitative and quantitative data from five New York metropolitan elementary schools. The authors examine the ways in which ‘Korean-ness’ and Korean parental involvement are discursively constructed and embodied in sociopolitical and historical contexts in the United States. We present two themes related to Korean parental involvement: (a) the double-edged component of respect for teachers and (b) biopolitics related to English language and parental involvement. By challenging normalized understanding about Korean-ness, the authors suggest a different approach to ethnoepistemology in order to enrich discourses concerning parental involvement and ethnic/racial studies
Facility Siting and Layout Optimization Based on Process Safety
In this work, a new approach to optimize facility layout for toxic release, fire and explosion scenarios is presented. By integrating a risk analysis in the optimization
formulation, safer assignments for facility layout and siting have been obtained.
Accompanying with the economical concepts used in a plant layout, the new model
considers the cost of willing to avoid a fatality, i.e. the potential injury cost due to
accidents associated with toxic release near residential areas. For fire and explosion
scenarios, the building or equipment damage cost replaces the potential injury cost. Two
different approaches have been proposed to optimize the total cost related with layout.
In the first phase using continuous-plane approach, the overall problem was
initially modeled as a disjunctive program where the coordinates of each facility and
cost-related variables are the main unknowns. Then, the convex hull approach was used
to reformulate the problem as a Mixed Integer Non-Linear Program (MINLP) that
identifies potential layouts by minimizing overall costs. This approach gives the
coordinates of each facility in a continuous plane, and estimates for the total length of
pipes, the land area, and the selection of safety devices. Finally, the 3D-computational
fluid dynamics (CFD) was used to compare the difference between the initial layout and the final layout in order to see how obstacles and separation distances affect the
dispersion or overpressures of affected facilities. One of the CFD programs, ANSYS
CFX was employed for the dispersion study and Flame Acceleration Simulator (FLACS)
for the fires and explosions.
In the second phase for fire and explosion scenarios, the study is focused on
finding an optimal placement for hazardous facilities and other process plant buildings
using the optimization theory and mapping risks on the given land in order to calculate
risk in financial terms. The given land is divided in a square grid of which the sides have
a certain size and in which each square acquires a risk-score. These risk-scores such as
the probability of structural damage are to be multiplied by prices of potential facilities
which would be built on the grid. Finally this will give us the financial risk.
Accompanying the suggested safety concepts, the new model takes into account
construction and operational costs. The overall cost of locations is a function of piping
cost, management cost, protection device cost, and financial risk. This approach gives
the coordinates of the best location of each facility in a 2-D plane, and estimates the total
piping length. Once the final layout is obtained, the CFD code, FLACS is used to
simulate and consider obstacle effects in 3-D space. The outcome of this study will be
useful in assisting the selection of location for process plant buildings and risk
management
Numerical Modelling for Effect of Water Curtain in Mitigating Toxic Gas Release
PresentationAs the chemical industry has developed, the use of toxic substances has increased, and leakage accidents have increased. Among various substances, hydrogen fluoride (HF) and ammonia (NH3) are representative materials for the study since both are hazardous and important in the chemical industry. HF is a strong, pervious substance that is a stimulates on the body, respiratory system, and skin. HF is widely used in electronics manufacturing as a polisher and disinfectant. Since an HF release accident occurred in Gumi, S. Korea (2012) the Korea Occupational Safety and Health Agency (KOSHA) has emphasized that special attention and management is needed with respect to this toxic substance. NH3 is widely used in the semiconductor industry and chemical processes. There have been about 20 large accidents regarding NH3 around the world in last 10 years. In this study, ANSYS Fluent, a computational fluid dynamics (CFD) program, was used to identify the effect of a water curtain as a mitigation system for toxic substances that are leaked from industrial facilities. Simulations were conducted to analyze how effectively a water curtain mitigated the dispersion of toxic substances. To verify the accuracy of the simulation, Goldfish experiment and INERIS Ammonia dispersion experiment were simulated and compared. Various water curtains were applied to the simulated field experiment to confirm the mitigation factors of toxic substances. The results show that the simulations and experiments are consistent and that the dispersion of toxic substances can be mitigated by water curtains
Extension of Zero Voltage Switching Capability for CLLC Resonant Converter
TheCLLC resonant converter has been widely used to obtaina high power conversion efficiency with sinusoidal current waveforms and a soft switching capability. However, it has a limited voltage gain range according to the input voltage variation. The current-fed structure canbe one solution to extend the voltage gain range for the wide input voltage variation, butit has a limited zero voltage switching (ZVS) range. In this paper, the current-fed CLLC resonant converter with additional inductance is proposed to extend the ZVS range. The operational principle is analyzed to design the additional inductance for obtaining the extended ZVS range. The design methodology of the additional inductance is proposed to maximize the ZVS capability for the entire load range. The performance of the proposed method is verified with a 20 W prototype converter
The impact of geopolitical risk on stock returns: Evidence from inter-Korea geopolitics
We investigate how corporate stock returns respond to geopolitical risk in the case of South Korea, which has experienced large and unpredictable geopolitical swings that originate from North Korea. To do so, a monthly index of geopolitical risk from North Korea (the GPRNK index) is constructed using automated keyword searches in South Korean media. The GPRNK index, designed to capture both upside and downside risk, corroborates that geopolitical risk sharply increases with the occurrence of nuclear tests, missile launches, or military confrontations, and decreases significantly around the times of summit meetings or multilateral talks. Using firm-level data, we find that heightened geopolitical risk reduces stock returns, and that the reductions in stock returns are greater especially for large firms, firms with a higher share of domestic investors, and for firms with a higher ratio of fixed assets to total assets. These results suggest that international portfolio diversification and investment irreversibility are important channels through which geopolitical risk affects stock returns
Coherent spore dispersion via drop-leaf interactions
Dispersion of plant pathogens, such as rust spores, is responsible for a
large portion of global crop production loss every year, in addition to the
threat they pose to human health. However, the release mechanism of pathogens
and other allergic particles from flexible plant surfaces into canopy
turbulence has not been well understood. Focusing on the phenomenon of
increased air-borne aerosols after rainfall, the present study elucidates how
the coupling of leaf elasticity and drop momentum directly modulates
surrounding airflow and spore transport. We found that drop impacts on leaves
shed asymmetric vortex dipoles (about the leaf width axis ) and
generate stream flows that enable pathogens to escape. To understand the
mechanics, we first built and experimentally validated a joint model of impact
mechanics and airfoil potentials to parametrically link drop momentum,
vibration speed, and dispersion capacity. Then with Lagrangian diagnostics, we
uncovered different sets of coherent structures around the leaf, providing a
dynamical description for how spores escape during rainfall. The work proposes
here a stand-alone, direct dispersion mechanics that incorporates the role of
plant substrate elasticity and emergent flow coherence. The physical insights
extracted here can help build physically informed analytics models for local
crop disease management.Comment: 12 pages, 4 figure
Facile fabrication of two-dimensional inorganic nanostructures and their conjugation to nanocrystals
Nanocomposites of two-dimensional (2D) inorganic nanosheets and inorganic nanocrystals are fabricated. Freestanding atomically flat gamma-AlOOH nanosheets (thickness <1 nm) are synthesized from a one-pot hydrothermal reaction. The freestanding and binder-free film composed of the gamma-AlOOH nanosheets is fabricated by sedimentation. Because they have positive zeta potentials in the pH range below ca. 9.3, the gamma-AlOOH nanosheets can function as positively charged 2D inorganic matrices in a broad pH range. By solution phase (pH 7.0) mixing of the gamma-AlOOH nanosheets (zeta potential: 30.7 +/- 0.8 mV) and inorganic nanocrystals with negative surface charge, including Au nanoparticles, Au nanorods, CdSe quantum dots, CdSe/CdS/ZnS quantum dots and CdSe nanorods, the nanocomposites are self-assembled via electrostatic interactions. Negatively charged inorganic nanostructures with a wide range of chemical compositions, shapes, sizes, surface ligands and adsorbates can be used as building blocks for gamma-AlOOH nanocomposites. Adsorption densities of inorganic nanocrystals on the nanocomposites can be controlled by varying concentrations of nanocrystal solutions. Nanocomposite films containing alternating layers of gamma-AlOOH and nanocrystals are obtained by a simple drop casting method.close3
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