• Communications for Statistical Applications and Methods
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• v.15 no.2
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• pp.265-271
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• 2008

It is commonly believed that diseases of human or economic traits of livestock are caused not by single genes acting alone, but multiple genes interacting with one another. This issue is difficult due to the limitations of parametric-statistic methods of gene effects. So we introduce multifactor-dimensionality reduction(MDR) as a methods for reducing the dimensionality of multilocus information. The MDR method is nonparametric (i. e., no hypothesis about the value of a statistical parameter is made), model free (i. e., it assumes no particular inheritance model) and is directly applicable to case-control studies. Application of the MDR method revealed the best model with an interaction effect between the SNPs, SNP1 and SNP3, while only one main effect of SNP1 was statistically significant for LMA (p < 0.01) under a general linear mixed model.

• The Korean Journal of Applied Statistics
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• v.22 no.2
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• pp.435-442
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• 2009

Multiple genes interacting is a difficult due to the limitations of parametric statistical method like as logistic regression for detection of gene effects that are dependent solely on interactions with other genes and with environmental exposures. Multifactor dimensionality reduction(MDR) statistical method by dummy variables was applied to identify interaction effects of single nucleotide polymorphisms(SNPs) responsible for longissimus mulcle dorsi area(LMA), carcass cold weight(CWT) and average daily gain(ADG) in a Hanwoo beef cattle population.

• Research in Mathematical Education
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• v.19 no.2
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• pp.117-139
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• 2015

For the purpose of determining neurophysiological mechanism of math anxiety, we conducted an EEG measurement for 22 sixth grade elementary students including 11 students with high math anxiety (HMA group), and 11 students with low math anxiety (LMA group). We found that in HMA group, delta wave was significantly generated from the right frontal lobe, and in LMA group, four paths are clearly connected while they perform math tasks (right inferior occipital gyrus ${\leftrightarrow}$ left superior parietal lobule /left middle frontal gyrus ${\leftrightarrow}$ left inferior parietal lobule /left middle frontal gyrus ${\leftrightarrow}$ right inferior parietal lobule / right middle frontal gyrus ${\leftrightarrow}$ right inferior parietal lobule). According to the above results we suggest that math anxiety is related to emotions associated with pain, reduces working memory and has a negative effect on math performance.

• Journal of Dental Anesthesia and Pain Medicine
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• v.17 no.1
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• pp.61-64
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• 2017

Nasotracheal intubation is generally a useful maxillofacial surgery that provides good surgical access for intraoral procedures. When nasotracheal intubation is difficult, laryngeal mask airway (LMA) insertion can be performed, and the flexible $LMA^{TM}$ (FLMA) is also useful for anesthetic management. However, the FLMA provides limited access to the mouth, which restricts the insertion of instrumentation and confines the surgical field available. Here, we present our experience using the FLMA airway management for dental treatment cases involving difficulty with intubation.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1995.04b
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• pp.320-325
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• 1995

This study deals with the active vibration control system for an all-clamped rectangular plate with piezoceramic actuators and sensors. A line nonent algorithm (LMA) with the distributed modal sensitivity(DMS) is proposed to reduce the structural vibrations effectively and to select the optimal locations and the optimal directions (skewed angles) of uniform piezoelectric actuators or sensors. Experimental results show that eachmode can attenuated byabout 10 .approx. 13 dB in case a piezoelectric actuator generate the psuedo-random disturbances that excite the plate modes.

• Research in Community and Public Health Nursing
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• v.24 no.4
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• pp.488-497
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• 2013

Purpose: The purpose of this study was to identify the construct equivalence of the general five factors of health behavior and to compare the latent means between adolescents with a health problem and those without in Korea. Methods: The 2009 KYRBS (Korean Youth Risk Behavior Survey) data were used for the analysis. Multi-group confirmatory factor analysis was performed to test whether the scale had configural, metric, and scalar invariances across the existence of health problems in adolescents. Results: Configural, metric, and factor invariances were satisfied for the latent mean analysis (LMA) between adolescents with health problem and those without. Adolescents with health problem and those without were not different in the LMA of all factors. Conclusion: Health providers should give more interest to the group of adolescents with health problems and consider prudential school life to the same group.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.1
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• pp.131-138
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• 2000

This paper works on development of an algorithm for mapping of cerebral perfusion parameters using the gamma-variate curve fitting. The signal intensity variate curve according to time measured in each pixel of perfusion MRI is nonlinear, and various hemodynamic parameters are not computed accurately. Levenberg-Marquardt algorithm(LMA), nonlinear optimum algorithm with high convergent speed and stability, is used to compute them. That is, the signal intensity variate curve is fitted by the gamma-variate function. Various hemodynamic parameters - Cerebral Blood Volume(C.B.V), Mean Transit Time(M.T.T), Cerebral Blood Flow(C.B.F), Time-to-Peak(T.T.P), Bolus Arrival Time(B.A.T), Maximum Slope(M.S) - are computed using LMA.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.594-596
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• 2011

PMIPv6 (Proxy Mobile IPv6)은 MN (Mobile Node)를 대신하여 액세스 망에서 MN의 이동성을 지원하는 네트워크 기반의 이동성 관리 프로토콜이다. 기존의 PMIPv6는 MN과 Corespondent Node (CN) 간 통신을 할 때, 교환하는 데이터 패킷은 LMA (Local Mobility Anchor)를 경유하고 MAG (Mobile Access Gateway)를 경유해서 전송하기 때문에 시그널링 코스트가 증가하고 전송 지연 문제가 발생한다. 따라서 본 논문은 MN이 도메인 내 핸드오버를 했을 시, LMA에서 MAG를 경유하지 않는 경로 최적화를 제시한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.617-620
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• 2011

본 논문은 Inter-Local Mobility Anchor 환경에서의 경로 최적화 기법을 Proxy Mobile IPv6 환경에서 캐쉬 정보를 활용하여 삼각 라우팅 문제를 해결하기 위해 경로 최적화 수행 시 빠른 처리 속도와 안정성을 가지는 방법에 대해 연구하였다. 기존의 경로 최적화 방법 중 inter-Local Mobility Anchor 환경에서 Liebsch의 방법은 모든 경우를 확인하기에 어떤 상황에서도 동일한 시그널링 코스트가 사용되지만 경로 최적화를 위한 프록시 바인딩의 시그널링 코스트가 많고, Dutta의 방법은 경로 최적화를 위한 프록시 바인딩의 시그널링 코스트는 효과적으로 감소시켰으나 Mobile Access Gateway 사이의 프록시 바인딩 과정이 없음으로 인하여 발생할 수 있는 문제점을 간과하였다. 본 논문에서는 Inter-Local Mobility Anchor 환경에서도 시그널링 비용은 증가시키지 않으면서 Local Mobility Anchor와 Mobile Access Gateway로부터 메시지를 받을 경우 응답 메시지를 전송하여 신뢰성을 향상시킨 경로 최적화 방법을 캐쉬 정보를 활용하는 방안에 관하여 연구하였다.

• Journal of applied mathematics & informatics
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• v.42 no.1
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• pp.139-148
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• 2024

The purpose of this research is to investigate sufficient conditions for the existence of limit cycles of the fifth-order differential equation x⁽⁵⁾ + (p² + q²)$_{x}^{...}$ + p²q²$_{x}^{.}$ = εF(t, x, $_{x}^{.}$, $_{x}^{..}$, $_{x}^{...}$, $_{x}^{....}$), where p, q are rational numbers different from 0, p ≠ ±q, ε is a small real parameter, and F is a 2kπ-periodic function in the variable t. Also, we provide some applications.