• Journal of applied mathematics & informatics
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• 제29권5_6호
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• pp.1541-1547
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• 2011

In this paper, using B.Ricceri's three critical points theorem, we prove the existence of at least three classical solutions for the problem $$\{u^{(4)}(t)={\lambda}f(t,\;u(t)),\;t{\in}(0,\;1),\\u(0)=u(1)=u^{\prime}(0)=u^{\prime}(1)=0,$$ under appropriate hypotheses.

• Korean Journal of Mathematics
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• 제28권2호
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• pp.391-403
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• 2020

In this paper, we initiate the concept of almost ζ- contractions via Simulation functions to find fixed points on M- metric spaces, and prove some related fixed points results for such mappings. Moreover an illustration is provided to show the applicability of our obtained results.

• Journal of applied mathematics & informatics
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• 제8권2호
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• pp.473-489
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• 2001

The notion of difference for two convex compact sets in Rⁿ, proposed by Rubinov et al, is generalized to R/sub mxn/. A formula of the difference for the two sets, which are convex hulls of a finite number of points, is developed. In the light of this difference, the relation between Clarke generalized Jacobian and quasidifferential, in the sense of Demyanov and Rubinov, for a nonsnooth function, is established. Based on the relation, the method of estimating Clarke generalized Jacobian via quasidifferential for a certain class of function, is presented.

• Journal of Acupuncture & Meridian Studies
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• 제11권6호
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• pp.367-374
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• 2018

This study describes the reliability of pragmatic combinations of acupuncture points for lateral epicondylalgia (LE) as prescribed by physiotherapists who were experts in acupuncture. Raters (n = 14; 33-59 years) independently prescribed acupuncture points for 30 simulated human patients with LE who were surveyed via a printed questionnaire. The frequency and cooccurrence of acupuncture points prescribed for patients with lateral epicondylitis were assessed. Absolute agreement and Light's kappa (${\kappa}_{Light}$) with 95% confidence interval (CI) were used to quantify the interrater agreement. Raters prescribed 103 unique acupuncture points in different combinations with a median (min-max) of 5 (0-11) acupuncture points. The most prescribed acupuncture point was LI-11 (297 of 420; 71%), and the most common cooccurring acupuncture points were LI-11 and LI-4 (160 of 420; 38%). The absolute agreement for prescribing the acupuncture points ranged from 70% (point GB-20) to 0% (points LI-10, SP-6, LI-11, GB-34, LI-12, and LI-4). Point LR-3 showed the highest interrater reliability for prescribing the acupuncture points [${\kappa}_{Light}=0.112$, 95% CI = (0.055-0.194)], whereas point LI-4 showed the lowest reliability [${\kappa}_{Light}=-0.003$, 95% CI = (-0.024 to 0.024)]. These findings suggest that pragmatic prescriptions of acupuncture points for LE are unreliable among physiotherapists who are experts in acupuncture. Explicit, high-level evidence-based rules for prescribing and teaching combinations of acupuncture points for LE are warranted.

• 대한공간정보학회지
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• 제18권2호
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• pp.93-97
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• 2010

본 연구에서는 카메라 자세 정보가 없는 무인헬기에 탑재된 카메라로부터 취득된 연속영상을 등록하기 위한 개량형 KLT기법을 제시하였으며 그 절차는 다음과 같이 구성된다. 초기 특징점은 연속영상에서 모서리점을 검출하고 동적프로그래밍에 의한 특성곡선매칭에 의해 특징점을 추적하였다. 추적된 특징점 중 오류점은 RANSAC추정법에 의해 제거되며 호모그래피이론에 의해 나머지점은 정확한 정합점으로 분류되었다. 영상등록에 의한 편위보정영상모자이크생성은 쌍일차보간법에 의해 생성하였으며, 결과분석을 통해 제시된 방법이 흔들림이 있는 연속영상을 등록하는데 적합한 방법임을 제시하였다.

• 응용통계연구
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• 제32권4호
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• pp.561-572
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• 2019

본 연구는 다층적 다중변화점 추정법으로 FDRSeg 기법과 SMUCE 기법의 이론적 특성을 파악하고 모의실험을 통해 경험적 특성을 비교하고자한다. FDRSeg (False discovery rate segmentation)기법은 FDR 기반 조절을 하여 변화점을 추정하고 SMUCE (simultaneous multiscale change-point estimator) 기법은 국소우도함수 기반 다중 검정으로 변화점을 추정한다. 변화점의 개수가 작을경우에는 두 기법에 의한 추정능력이 비슷하다. 변화점 개수가 많을수록 FDRSeg 의 추정이 변화점 개수와 추정측도 면에서 더 좋은 편이다. 실제 데이터 분석으로 검층 주상도 데이터에 대해 각 기법으로 다중변화점 추정을 하고 비교한다.

• 대한수학회보
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• 제43권4호
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• pp.821-829
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• 2006

We determine reducibility points of degenerate principal series for exceptional p-adic groups of type $G_2$ via Jacquet module techniques and Hecke algebra isomorphisms.

• 대한물리의학회지
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• 제15권4호
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• pp.55-65
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• 2020

PURPOSE: This study examined the effects of breathing exercises via joint mobilization on the lung function and spinal alignment of 30 straight-necked women in their 20 s and 30 s. METHODS: The participants were divided into two groups: an experimental group who performed breathing exercises via joint mobilization, and a control group who performed general stretching exercises. The differences between the two groups were measured and compared at three points in time: during the pre-examination, after four weeks of intervention, and after a four-week maintenance period. The changes in each group were measured before and after the intervention and after a one-month maintenance period and compared. For data analysis, the SPSS 22 was used to obtain the mean and standard deviation with a significance level of α = .05. RESULTS: Eight weeks of breathing exercises via joint mobilization and general stretching exercises positively impacted the lung function and spinal alignment in straight-necked patients. In particular, the experimental group showed more significant differences in spinal alignment after four weeks period of intervention and four weeks of maintenance. CONCLUSION: Breathing exercises via joint mobilization can be considered an effective intervention that can improve the respiratory volume and spinal alignment for patients with straight necks.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2015년도 제49회 하계 정기학술대회 초록집
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• pp.126.1-126.1
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• 2015

A quantitative relationship between Leidenfrost point and surface characteristics such as surface material and roughness is investigated. Based on the relationship, we have fabricated the surfaces with their Leidenfrost points (LFP) tuned by controlling surface coating and structures. As discovered by Leidenfrost, liquids placed on a hot plate levitate on the gas phase-air gap formed by the vaporization of liquids. This phenomenon is called 'Leidenfrost effect'. A change of LFP has attracted many researchers for several years but the ability to tune LFP is still a remaining issue. Many of previous work has progressed for various conditions so the systematic approach and analysis are needed to clearly correlate the LFP and the surface conditions. In this report, we investigate a relation of surface energy and LFP using various coating materials such as Octadecyltrichlorosilane (OTS) and 1H, 1H, 2H, 2H-Perfluorooctyltrichlorosilane (FOTS). Also, we analyze how surface roughness affects LFP via surface micro structuring with ICP-RIE fabrication process. The improved understanding can have potential applications such as the control of liquid droplet behavior at elevated temperatures for efficient cooling system.

• 제어로봇시스템학회논문지
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• 제22권3호
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• pp.233-240
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• 2016

This paper describes a three-dimensional reference trajectory generation method for giving commands to an unmanned air vehicle (UAV). The trajectory is a set of consecutive curves with constant acceleration during each interval and passing through via-points at specified times or speeds. The functional inputs are three-dimensional positions and times (or speeds) at via-points, and velocities at both boundaries. Its output is the time series of position values satisfying the piecewise constant acceleration condition. To be specific, the shape of the trajectory, known as the path, is first represented by splines using third degree polynomials. A numeric algorithm is then suggested, which can overcome the demerits of cubic spline method and promptly generate a piecewise constant acceleration trajectory from the given path. To show the effectiveness of the present scheme, trajectory generation cases were treated, and their speed calculation errors were evaluated.