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Seoul, South Korea

Chung-Ang University is a notable private university based in Seoul.Starting as a church-run kindergarten in 1918, CAU transformed into a female school for kindergarten teachers in 1922 and was granted university status in 1953. The university claimed 2018 to be their centennial. It has 33,600 undergraduates, 5,200 graduates, 700 professors and 500 more part-time teaching staff.CAU is the first in South Korea to offer courses in Pharmacy, Business Management, Mass Communication, Advertising & Public Relations, Creative Writing, Photography, and Drama & Film Studies, and is active in Pharmacy, Media and the Arts. Wikipedia.

This paper presents a distributed containment control approach for uncertain nonlinear strict-feedback systems with multiple dynamic leaders under a directed graph topology where the leaders are neighbors of only a subset of the followers. The strict-feedback followers with nonparametric uncertainties are considered and the local adaptive dynamic surface controller for each follower is designed using only neighbors' information to guarantee that all followers converge to the dynamic convex hull spanned by the dynamic leaders where the derivatives of leader signals are not available to implement controllers, i.e.; the position information of leaders is only required. The function approximation technique using neural networks is employed to estimate nonlinear uncertainty terms derived from the controller design procedure for the followers. It is shown that the containment control errors converge to an adjustable neighborhood of the origin. © 2013 Published by Elsevier Ltd.

Lee Y.-S.,Chung - Ang University
Molecular Brain | Year: 2014

Mutant mice have been used successfully as a tool for investigating the mechanisms of memory at multiple levels, from genes to behavior. In most cases, manipulating a gene expressed in the brain impairs cognitive functions such as memory and their underlying cellular mechanisms, including synaptic plasticity. However, a remarkable number of mutations have been shown to enhance memory in mice. Understanding how to improve a system provides valuable insights into how the system works under normal conditions, because this involves understanding what the crucial components are. Therefore, more can be learned about the basic mechanisms of memory by studying mutant mice with enhanced memory. This review will summarize the genes and signaling pathways that are altered in the mutants with enhanced memory, as well as their roles in synaptic plasticity. Finally, I will discuss how knowledge of memory-enhancing mechanisms could be used to develop treatments for cognitive disorders associated with impaired plasticity. © 2014 Lee; licensee BioMed Central Ltd.

Kwon S.-H.,Chung - Ang University
Optics Express | Year: 2012

We propose a plasmonic whispering-gallery-mode cavity comprising of a dielectric disk with sub-hundred nanometer thickness sandwiched by two silver disks. By reducing radius and thickness carefully based on the investigated resonant wavelength dependencies, the surfaceplasmonpolariton cavity mode with a resonant wavelength of 1550 nm can be confined in a disk with a radius of 88 nm and a thickness of 10 nm, where the physical size of the cavity is 0.000064 λ0 3 (λ0: free space wavelength). The cavity mode has a deep subwavelength mode volume of 0.010 (λ/2n)3 and a high quality factor of 1900 at 40K, consequently, a large Purcell factor of 1.1 × 105. © 2012 Optical Society of America.

Qin S.,Chung - Ang University | Qin S.,Stanford University
Nature neuroscience | Year: 2014

The importance of the hippocampal system for rapid learning and memory is well recognized, but its contributions to a cardinal feature of children's cognitive development-the transition from procedure-based to memory-based problem-solving strategies-are unknown. Here we show that the hippocampal system is pivotal to this strategic transition. Longitudinal functional magnetic resonance imaging (fMRI) in 7-9-year-old children revealed that the transition from use of counting to memory-based retrieval parallels increased hippocampal and decreased prefrontal-parietal engagement during arithmetic problem solving. Longitudinal improvements in retrieval-strategy use were predicted by increased hippocampal-neocortical functional connectivity. Beyond childhood, retrieval-strategy use continued to improve through adolescence into adulthood and was associated with decreased activation but more stable interproblem representations in the hippocampus. Our findings provide insights into the dynamic role of the hippocampus in the maturation of memory-based problem solving and establish a critical link between hippocampal-neocortical reorganization and children's cognitive development.

Song K.Y.,Chung - Ang University
Optics Letters | Year: 2011

The first (to our knowledge) observation of Brillouin dynamic grating in conventional single-mode fibers is reported, and the characterization is demonstrated with respect to the external parameters for the grating generation. When a 100m single-mode fiber is used, a reflectance of 8% with a spectral bandwidth as low as 2:4 MHz is achieved, which is less than 10% of ordinary Brillouin gain bandwidth. © 2011 Optical Society of America.

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