Chaotic Dynamics in Tobacco’s Addiction Model

Youngchul Bae 한국지능시스템학회 2014 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.14 No.4

Chaotic dynamics is an active area of research in biology, physics, sociology, psychology, physiology, and engineering. This interest in chaos is also expanding to the social scientific fields such as politics, economics, and argument of prediction of societal events. In this paper, we propose a dynamic model for addiction of tobacco. A proposed dynamical model originates from the dynamics of tobacco use, recovery, and relapse. In order to make an addiction model of tobacco, we try to modify and rescale the existing tobacco and Lorenz models. Using these models, we can derive a new tobacco addiction model. Finally, we obtain periodic motion, quasi-periodic motion, quasi-chaotic motion, and chaotic motion from the addiction model of tobacco that we established. We say that periodic motion and quasi-periodic motion are related to the pre-addiction or recovery stage, respectively. Quasi-chaotic and chaotic motion are related to the addiction stage and relapse stage, respectively.

Using predicted cumulative probability distribution of hidden Markov Model for European option pricing

Youngchul Han,Jungwoo Lee,Jeong-Hoon Kim 한국재무학회 2013 한국재무학회 학술대회 Vol.2013 No.11

In this paper, we proposed model for European option pricing using predicted cumulative probability distribution of hidden Markov Model. The Black-Scholes model is based on Gaussian distribution and the model's main shortfall is fat-tail problem. Because of fat-tail problem, the implied volatility surface is shaped skew, smirk or other forms. To correct model's drawback, we extract predicted cumulative distribution using hidden Markov Model and simulate the underlying price paths using Monte Carlo method. In the results, our model re ect current implied volatility surface suciently.

Study of resistance in rice innate immunity by non-RD kinases

Youngchul Yoo,Jong-Chan Park,Joo-Mi Yoon,Min-Young Song,Chi-Yeol Kim,Jong-Seong Jeon,Sang-Won Lee 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07

Disease is one of the significant factors to damage for the crop productivity, including rice. Although there are many methods to avoid from several diseases such as chemical pesticides and biological treatments, it has been appreciated that the most economical and environmentally effective method of disease control is application of resistance genes. A survey (Dardick & Ronald, 2006) reported that plant kinome has a small number of non-RD kinase (nRDK) (4-29% of total kinase), all known or predicted pattern recognition receptors (PRRs) fall into the class. We here introduce a strategy to identify rice resistance genes that are probably encoding PRRs. We selected 130 nRDK genes by combinational analysis of QTL and bioinformatics, 61 of rice mutant lines of 130 candidates inoculated by Xanthomonas oryzae pv. oryzae (Xoo) and Magnaporthe grisea. (M. grisea), and disease progression was monitored. Lesion lengths of the activation mutant lines for nRDK-08 and nRDK-18 genes reduced more than 34% compared to wild type of rice (Dongjin) and other mutant lines. The nRDK-03 and nRDK-17 gene activation rice line had remarkably smaller lesion lengths by M. grisea infection. Our results suggest that a reverse genetic approach using bioinformatics and T-DNA tagging system successfully identified nRDK genes conferring a resistance against Xoo and M. grisea.

Caffeine synthesis by exogenous methyltransferase genes in rice confers a broad-spectrum resistance against biotic stresses

Youngchul Yoo,Jong Chan Park,Joo-Mi Yoon,Hyemin Lim,Gang-Seob Lee,Sang-Won Lee 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07

Plants have evolved a set of protecting mechanisms against pathogens, which include secondary metabolites and induced defense responses to pathogen attack. The biological role of purine alkaloids including caffeine is largely unknown. It has been proposed that caffeine confers a resistance against pathogenic bacteria and herbivores. We, in this study, tested direct effects on the growth of rice pathogenic microbes, Xanthomonas oryzae pv. oryzae (Xoo) causing a bacterial leaf blight and Magnaporthe grisea (M. grisea) causing a rice blast. Cell growth of Xoo and M. grisea were significantly retarded in presence of high concentration (2mM) of caffeine. Exogenous caffeine (5mM) induced resistance of wild type rice (cv. Dongjin, susceptible to Xoo and M. grisea) against those pathogens. These results indicated that caffeine enhanced the basal resistance to infection with Xoo. In addition, expression of pathogenesis-related (PR) genes was tested in the caffeine treated rice to elucidate the acquired resistance by caffeine, resulted in induction of PR genes including OsPR1a and OsPrb1. We have generated a transgenic rice producing caffeine by introduction of three N- methyltransferase genes (CaXMT1, CaMXMT1, CaDXMT1) identified from coffee plant. The transgenic rice successfully expressed the three genes, synthesized caffeine up to 5ug/g and showed enhanced resistance to Xoo. We also observed that transcripts of PR genes such as the OsPR1a and OsPrb1 encoding PR-1 type pathogenesis-related protein increased in the caffeine-producing rice. These result showed that caffeine is likely to act a powerful factor to increase level of rice defense as a natural and non-harmful metabolite.

Chaotic Phenomena in Addiction Model for Digital Leisure

Youngchul Bae 한국지능시스템학회 2013 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.13 No.4

Chaotic dynamics have been studied by many researchers in the fields of biology, physics, and engineering. Interest in chaos is also expanding to the social sciences such as politics, economics, and others, including the prediction of societal events. The concept of leisure has developed from a passive concept correlated with relaxation, entertainment, and ideology formation into a positive concept that assumes a more active role. As information and communications technology develops, digital leisure activity is expected to continue spreading. This expansion of digital leisure function correctly, as well as. Traditional leisure activity functions correctly more, whereas digital leisure activity is predicted to function incorrectly more often. In this paper, we propose a mathematical addiction model of digital leisure that deals with its dysfunctions such as addiction to digital leisure, including computer games, internet search, internet chatting, and social media. Herein, to solve addiction to digital leisure, we propose a model derived from a nicotine addiction.

Multimodal Drowsiness Detection Methods using Machine Learning Algorithms

Youngchul Kim,Minsoo Yeo,Illsoo Sohn,Cheolsoo Park 대한전자공학회 2018 IEIE Transactions on Smart Processing & Computing Vol.7 No.5

Drowsiness is a main threat to drivers, and induces inefficiency in various fields, such as industry and education. In this paper, monitoring drowsiness is investigated in which five healthy volunteers participated in an experiment to elicit drowsiness. The subjects were asked to limit their sleep duration to only two to three hours and restrict caffeine intake during the 24 hours prior to the experiment. In the experiment, a one-channel electrocardiogram (ECG) and a single-channel electroencephalogram (EEG) were simultaneously recorded. The ECG and EEG features were extracted and fed into machine learning, random forest, multilayer perceptron, and support vector machine algorithms. Various feature combinations were utilized to train the algorithms, and random forest yielded the best performance at about 90% accuracy, precision, and recall, with 10-second epochs in the ECG and EEG.

Synchronization of Dynamical Happiness Model

Youngchul Bae 한국지능시스템학회 2014 INTERNATIONAL JOURNAL of FUZZY LOGIC and INTELLIGE Vol.14 No.2

Chaotic dynamics is an active research area in fields such as biology, physics, sociology, psychology, physiology, and engineering. Interest in chaos is also expanding to the social sciences, such as politics, economics, and societal events prediction. Most people pursue happiness, both spiritual and physical in many cases. However, happiness is not easy to define, because people differ in how they perceive it. Happiness can exist in mind and body. Therefore, we need to be happy in both simultaneously to achieve optimal happiness. To do this, we need to synchronize mind and body. In this paper, we propose a chaotic synchronization method in a mathematical model of happiness organized by a second-order ordinary differential equation with external force. This proposed mathematical happiness equation is similar to Duffing’s equation, because it is derived from that equation. We introduce synchronization method from our mathematical happiness model by using the derived Duffing equation. To achieve chaotic synchronization between the human mind and body, we apply an idea of mind/body unity originating in Oriental philosophy. Of many chaotic synchronization methods, we use only coupled synchronization, because this method is closest to representing mind/body unity. Typically, coupled synchronization can be applied only to non-autonomous systems, such as a modified Duffing system. We represent the result of synchronization using a differential time series mind/body model.

Korean Case Markers and Genericity

Youngchul Jun 사단법인 한국언어학회 1999 언어학 Vol.0 No.24

Nonclassical Measure of Multi-mode Radiation Field

Youngchul Kim,Kisik Kim 한국물리학회 2004 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.44 No.4

The nonclassical measure of a single mode radiation eld is extended to a multi-mode radiation eld. This extended nonclassical measure is applied to the output elds from a beam splitter. While the single mode nonclassical measure of each output eld is generally reduced, the two mode nonclassical measure is preserved. This preservation is explained in terms of entanglement.

An Improved CWDM Demultiplexer based on Two-Mode-Interference Principle

Youngchul Chung,In-Sang Oh,Joon-Oh Park,Nam-Chun Heo 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.2

An improved design for a CWDM (coarse wavlength division multiplexing) demultiplexer based on the two-mode interference (TMI) principle is proposed, and the performance, such as crosstalk and insertion loss, is shown to be superior to that of a conventional demultiplexer. The temperature dependence of the transmission is very small, which makes the TMI demultiplexer suitable for CWDM applications.