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1
Semantic Representations in Monolingual and Bilingual Connectionist Networks

( Nicholas Rendell ),( Eddy J. Davelaar ) 서울대학교 인지과학연구소 2015 Journal of Cognitive Science Vol.16 No.3
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  KCI
  
  KISS
Repeated practice of inhibitory processes in bilinguals leads to an advantage in tasks requiring control processes. This advantage has been postulated to contribute to cognitive reserve as an offset to age and dementia related decline. Two models are presented which have learned the names of a series of pictures belonging to two categories. The first model learned the names of both categories in a single language, the second in two languages. In line with the dopamine hypothesis, change in gain of the log-sigmoidal transfer function was applied to provide a valid age related change. The results demonstrated greater separation of representations for monolinguals than for bilinguals. This occurred both for individual representations within a category and between categories. Furthermore, an interaction between brain reserve capacity, a biological category of cognitive reserve, and whether or not the model was bilingual or monolingual was observed for measures of separation. The results are discussed in terms of retrieval induced inhibition which suggest that the closer representations are to each other, the greater the recruitment of inhibitory processes.
2
Plasmonically enhanced emission from a group-III nitride nanowire emitter

Mastro, Michael A,Freitas Jr, Jaime A,Glembocki, Orest,Eddy Jr, Charles R,Holm, R T,Henry, Rich L,Caldwell, Josh,Rendell, Ronald W,Kub, Fritz,Kim, J IOP Pub 2007 Nanotechnology Vol.18 No.26
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<P>The plasmonic response from a nanotextured silver coating was utilized to enhance the transfer of ultraviolet light generated in a group-III nitride nanowire emitter. A two-step approach was developed in a metal–organic chemical vapour deposition system to grow nanowires initially vertically by the vapour–liquid–solid mechanism and, subsequently, laterally by increasing the growth temperature and the group-V/III reactant ratio. This controllably produced a 20 nm GaN:Si core with a 200 nm outer-diameter AlGaN:Mg sheath structure. Solvothermal chemistry based on an ethylene glycol solvent was employed to deposit a silver coating that approximated a dense packing of metallic nanospheres. Nanoscale emission and plasmonically enhanced transfer of this energy were simulated to aid the development and understanding of this system.</P>