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Vibrotactile Display: Perception, Technology, and Applications
Seungmoon Choi,Kuchenbecker, K. J. IEEE 2013 Proceedings of the IEEE Vol.101 No.9
<P>This paper reviews the technology and applications of vibrotactile display, an effective information transfer modality for the emerging area of haptic media. Our emphasis is on summarizing foundational knowledge in this area and providing implementation guidelines for application designers who do not yet have a background in haptics. Specifically, we explain the relevant human vibrotactile perceptual capabilities, detail the main types of commercial vibrotactile actuators, and describe how to build both monolithic and localized vibrotactile displays. We then identify exemplary vibrotactile display systems in application areas ranging from the presentation of physical object properties to broadcasting vibrotactile media content.</P>
( Seungmoon Choi ) 한국감성과학회 2015 추계학술대회 Vol.2015 No.-
This talk presents our recent finding that a laser that is radiated on a thin light-absorbing elastic medium attached on the skin can elicit a tactile sensation of mechanical tap. Laser radiation to the elastic medium creates inner elastic waves on the basis of thermoelastic effects, which subsequently move the medium and stimulate the skin. We characterize the associated stimulus by measuring its physical properties. In addition, the perceptual identity of the stimulus is confirmed by comparing it to mechanical and electrical stimuli by means of perceptual spaces. All evidence claims that indirect laser radiation conveys a sensation of short mechanical tap with little individual difference. To the best of our knowledge, this is the first study that discovers the possibility of using indirect laser radiation for mid-air tactile rendering.
Seungmoon Choi 한국재무학회 2018 한국재무학회 학술대회 Vol.2018 No.05
Since Aït-Sahalia (2002)s seminal work on obtaining a closed-form approximate transition probabil- ity density function (ATPDF) of a univariate time-homogeneous di¤usion process, many researchers employed his idea to extend it to more general cases. Those include ATPDFs of univariate time- inhomogeneous di¤usions (Egorov, Li, and Xu (2003)), likelihood expansions of multivariate time- homogeneous di¤usions (Aït-Sahalia (2008)), ATPDFs of multivariate time-homogeneous jump di¤u- sions (Yu (2007)), likelihood expansions of multivariate time-inhomogeneous di¤usions (Choi (2013)), and ATPDFs of multivariate di¤usions (Choi (2015)). This article considers getting an explicit form of an ATPDF for multivariate time-inhomogeneous jump di¤usion processes which encompass all of the aforementioned models. Using the Kolmogorov partial di¤erential equation (PDE), we rst nd PDEs of the coe¢ cients of the ATPDF. These PDEs can be solved and we can get the formulas to retrieve all coe¢ cients of the ATPDF successively when the multivariate time-inhomogeneous jump di¤usion is reducible. However, if it is not reducible we can no longer solve the PDEs. In this case, Taylor-expanding the coe¢ cients and matching the same orders in the PDEs yield an ATPDF for the time-homogeneous jump di¤usion. But in the case of time-inhomogeneous jump di¤usion, the similar indeterminacy problem to Choi (2013) occurs. We prove that all of the generally nonzero indeterminate terms are cancelled out in the TPDF expansion. The ATPDF can be utilized to a variety of areas including maximum likelihood estimation, asset pricing, and Bayesian analysis.
Social deficits in the AY-9944 mouse model of atypical absence epilepsy
Jung, Seungmoon,Seo, Jin Soo,Kim, Byung Sun,Lee, Doheon,Jung, Keun-Hwa,Chu, Kon,Lee, Sang Kun,Jeon, Daejong Elsevier 2013 Behavioural brain research Vol.236 No.-
<P><B>Abstract</B></P> <P>Atypical absence epilepsy (AAE) showing slow spike-and-wave discharges (SWD) is characterized by severely abnormal cognition and neurodevelopmental or neurological outcomes in humans. However, despite the severe behavioral outcomes in AAE, the relationship between AAE and social-behavioral dysfunctions has not defined well, either experimentally or in patients with AAE. Experimentally, AAE can be produced by administering AY-9944 (AY), a cholesterol biosynthesis inhibitor. In this study, we characterized social behavior in the AY mouse model of AAE. AAE in the mouse was induced by repeated postnatal administration of AY every 6 days from postnatal day (P) 2 to P20. AY-treated mice exhibited spontaneous, recurrent, and synchronous SWD (4–5Hz) in electroencephalographic recordings. AY-treated mice performed tasks involving sociability/social novelty preference, social interaction with a juvenile conspecific, observational fear, and resident–intruder aggression. They showed behavioral dysfunction in social interactions with a juvenile conspecific and sociability/social novelty preference tasks. They also exhibited reduced social fear learning in observational fear conditioning. Interestingly, they showed increased levels of offensive behaviors in a resident–intruder task. However, AY-treated mice displayed normal levels of anxiety in light/dark transition and the elevated plus maze tasks, and showed slightly increased locomotor activity in an open-field task. These results demonstrate social dysfunction in the AY-induced AAE model. Our study of social behavior can also provide valuable information about Lennox–Gastaut syndrome, in which AAE is a component. Thus, our findings may help to understand behavioral pathogenesis or characteristics of patients with AAE.</P> <P><B>Highlights</B></P> <P>▸ Psychiatric comorbidities are a major concern in atypical absence epilepsy (AAE). ▸ Administration of AY-9944 can produce a mouse model of AAE. ▸ AY-treated mice show spontaneous and recurrent spike-and-wave discharge (4–5Hz). ▸ Severe social deficits, but normal anxiety, were found in the AY model of AAE.</P>