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Search Results: 1 - 10 of 6587 matches for " Chung Soon-Yeong "
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Superstability of generalized cauchy functional equations
Lee Young-Su,Chung Soon-Yeong
Advances in Difference Equations , 2011,
Abstract: In this paper, we consider the stability of generalized Cauchy functional equations such as Especially interesting is that such equations have the Hyers-Ulam stability or superstability whether g is identically one or not. 2000 Mathematics Subject Classification: 39B52, 39B82.
Stability of Quartic Functional Equations in the Spaces of Generalized Functions
Lee Young-Su,Chung Soon-Yeong
Advances in Difference Equations , 2009,
Abstract: We consider the general solution of quartic functional equations and prove the Hyers-Ulam-Rassias stability. Moreover, using the pullbacks and the heat kernels we reformulate and prove the stability results of quartic functional equations in the spaces of tempered distributions and Fourier hyperfunctions.
Stability of Quartic Functional Equations in the Spaces of Generalized Functions
Young-Su Lee,Soon-Yeong Chung
Advances in Difference Equations , 2009, DOI: 10.1155/2009/838347
Abstract: We consider the general solution of quartic functional equations and prove the Hyers-Ulam-Rassias stability. Moreover, using the pullbacks and the heat kernels we reformulate and prove the stability results of quartic functional equations in the spaces of tempered distributions and Fourier hyperfunctions.
Stability of Cubic Functional Equation in the Spaces of Generalized Functions
Young-Su Lee,Soon-Yeong Chung
Journal of Inequalities and Applications , 2007, DOI: 10.1155/2007/79893
Abstract: In this paper, we reformulate and prove the Hyers-Ulam-Rassias stability theorem of the cubic functional equation f(ax+y)+f(ax ¢ ’y)=af(x+y)+af(x ¢ ’y)+2a(a2 ¢ ’1)f(x) for fixed integer a with a ¢ ‰ 0, ±1 in the spaces of Schwartz tempered distributions and Fourier hyperfunctions.
Prevalence of human papillomavirus infection and genotype distribution among high-risk Korean women for prospecting the strategy of vaccine development
Jee Eun Rhee, Mi Yeong Shin, Choong Mo Kim, Hye Young Kee, Jae Keun Chung, Sang-Kee Min, Seong-Joon Kim, Dai-Ho Jang, Sung Soon Kim, Byeong-Sun Choi
Virology Journal , 2010, DOI: 10.1186/1743-422x-7-201
Abstract: Infection with certain types of human papillomavirus (HPV) is recognized as a causal and necessary factor for developing cervical cancer [1,2], which is the fourth of the most common cancer in South Korean women [3]. More than 140 different HPV genotypes have been characterized and approximately 50 of these genotypes are known to infect the genital tract and be oncogenic or high-risk (HR) types (HPV-16, -18, -31, -33, -35, -39, -45, -51, -52, -56, -58, -59, -66 and -68). HR genotypes are significantly associated with progression to invasive cervical cancer [2,4]. Therefore, assessment of the HPV genotypic spectrum among sexually active women is important for predicting public health problems such as the risks of developing cervical intraepithelial neoplasia and cervical cancer [5,6].HPV-16, the most common HR type, is detected in 50 - 60% of high-grade squamous intraepithelial lesions and invasive cervical cancers and HPV-18 is followed by an incidence of 10 - 20% [4,7]. Thus, HPV-16 and -18 are considered as the types responsible for causing most cervical cancers in many countries [4,7]. Clinical trials have reported that these vaccines can protect many uninfected women from developing precancerous cervical lesions caused by HPV-16 and -18 [8,9]. In spite of their high effectiveness to reduce the incidence of cervical cancer, the usefulness of these vaccines is still being debated because of the differences in the geographical distribution of HPV genotypes [10].Vaccines against HPV-16 and -18 have been developed to help the prevention of cervical cancer and the use of Merck's Gardasil (the quadrivalent vaccine for HPV-6, -11, -16 and -18) and GSK's Cervarix (the bivalent vaccine for HPV-16 and -18) have been licensed by the Korea Food and Drug Administration. Population-based study for the distribution of HPV genotype is needed to predict how much these vaccines might influence to the prevention of cervical cancer.In the present study, the prevalence and distributi
Bis[μ-4-(1H-imidazol-3-ium-1-yl)benzoato-κ2O:O′]bis[(methanol)tris(nitrato-κ2O,O′)terbium(III)]
Yeong-Min Jung,Soon W. Lee
Acta Crystallographica Section E , 2011, DOI: 10.1107/s1600536811002443
Abstract: In the centrosymmetric dinuclear title complex, [Tb2(NO3)6(C10H8N2O2)2(CH3OH)2], the Tb atoms are bridged by the carboxylate groups of the two 4-(1H-imidazol-3-ium-1-yl)benzoate (iba) ligands. The iba ligand adopts a zwitterionic form with a protonated imidazole group. The Tb atom adopts a distorted tricapped trigonal–prismatic coordination geometry and is coordinated by six O atoms of three chelating nitrate ions, one O atom of the methanol molecule and two O atoms of two iba ligands. The intramolecular Tb...Tb separation is 5.1419 (3) . O—H...O and N—H...O hydrogen bonds connect complex molecules into a two-dimensional network.
Neurobiologically Inspired Control of Engineered Flapping Flight
Soon-Jo Chung,Michael Dorothy
Mathematics , 2009, DOI: 10.2514/1.45311
Abstract: This article presents a new control approach and a dynamic model for engineered flapping flight with many interacting degrees of freedom. This paper explores the applications of neurobiologically inspired control systems in the form of Central Pattern Generators (CPG) to control flapping flight dynamics. A rigorous mathematical and control theoretic framework to design complex three dimensional wing motions is presented based on phase synchronization of nonlinear oscillators. In particular, we show the flapping flying dynamics without a tail or traditional aerodynamic control surfaces can be effectively controlled by a reduced set of CPG parameters that generate phase-synchronized or symmetry-breaking oscillatory motions of two main wings. Furthermore, by using Hopf bifurcation, we show that tailless aircraft alternating between flapping and gliding can be effectively stabilized by smooth wing motions driven by the CPG network. Results of numerical simulation with a full six degree-of-freedom flight dynamic model validate the effectiveness of the proposed neurobiologically inspired control approach.
Distributed Estimation using Bayesian Consensus Filtering
Saptarshi Bandyopadhyay,Soon-Jo Chung
Mathematics , 2014,
Abstract: We present the Bayesian consensus filter (BCF) for tracking a moving target using a networked group of sensing agents and achieving consensus on the best estimate of the probability distributions of the target's states. Our BCF framework can incorporate nonlinear target dynamic models, heterogeneous nonlinear measurement models, non-Gaussian uncertainties, and higher-order moments of the locally estimated posterior probability distribution of the target's states obtained using Bayesian filters. If the agents combine their estimated posterior probability distributions using a logarithmic opinion pool, then the sum of Kullback--Leibler divergences between the consensual probability distribution and the local posterior probability distributions is minimized. Rigorous stability and convergence results for the proposed BCF algorithm with single or multiple consensus loops are presented. Communication of probability distributions and computational methods for implementing the BCF algorithm are discussed along with a numerical example.
Conceptual Modeling of Contaminated Solute Transport Based on Stream Tube Model  [PDF]
Seung-Gun Chung, Soon-Jae Lee, Dong-Ju Kim, Sang-Hyup Lee, Jae-Woo Choi
Advances in Chemical Engineering and Science (ACES) , 2012, DOI: 10.4236/aces.2012.24059
Abstract: In this study, we performed a conceptual modeling on solute transport based on theoretical stream tube model (STM) with various travel time distributions assuming a pure convective flow through each tube in order to investigate how the lengths and distributions of solute travel time through STM affect the breakthrough curves at the end mixing surface. The conceptual modeling revealed that 1) the shape of breakthrough curve (BTC) at the mixing surface was determined by not only input travel time distributions but also solute injection mode such as sampling time and pulse lengths; 2) the increase of pulse length resulted in the linear increase of the first time moment (mean travel time) and quadratic increase of the second time moment (variance of travel time) leading to more spreading of solute, however, the second time moment was not affected by travel time distributions and 3) for a given input distributions the increase in travel distance resulted in more dispersion with the quadratic increase of travel time variance. This indicates that stream tube model obeying strictly pure convective flow follows the concept of convective-lognormal transport (CLT) model regardless the input travel time distributions.
Continuous-Grouped-Self-Learning: In the Perspective of Lecturers, Tutors and Laboratory Instructors
Mohd Azrin Mohd Azau,Low Ming Yao,Goo Soon Aik,Chin Kock. Yeong
International Education Studies , 2009, DOI: 10.5539/ies.v2n1p58
Abstract: This paper presents the perception of lecturers, tutors and lab instructors towards the implemented Continuous-Group-Self-Learning (CGSL) in the Department of Computer and Communication System Engineering (CCSE), Universiti Putra Malaysia. This innovative system introduces mock teaching and student-lecturer role as a technique of delivery. The system ensures a continuous group work and the students are learning with class-oriented problem-based learning (CO-PBL) instead of seasonal project oriented problem-based learning (PO-PBL). The radical change in the assessment by adopting mock teaching oriented assessment (MTOA) has given a new definition to assess the student thoroughly. 49 respondents have taken part in this study, in which 30 of them are lecturers, 8 are tutors and 11 are laboratory instructors who currently active serving in the department. In general, 56% of the respondent do not agree this learning system shifted the teaching job to the students and 56.55% of them disagree this approach is a burdensome to the students who are undergoing this learning style. This system in fact a catalyst that urges the lecturers, tutors and lab instructors to enhance themselves in order to cope up with the ‘knowledge demand’ from the student when 82.1% of the respondents agree to be more knowledgeable as compared to conventional teaching method.
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