• 대한의용생체공학회:의공학회지
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• 제17권2호
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• pp.235-240
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• 1996

The automated ECG diagnostic systems that are odd in hospitals have low performance of P-wave detection when faced with some diseases such as conduction block. So, the purpose of this study was the improvement of detection performance in conduction block which is low in P-wave detection. The first procedure was removal of baseline drift by subtracting the median filtered signal of 0.4 second length from the original signal. Then the algorithm detected R peak and T end point and cancelled the QRS-T complex to get'p prototypes'. Next step was magnification of P prototypes with dispersion and detection of'p candidates'in the magnified signal, and then extraction of contextual information concerned with P-waves. For the last procedure, the CIR was applied to P candidates to confirm P-waves. The rule base consisted of three rules that discriminate and confirm P-waves. This algorithm was evaluated using 500 patient's raw data P-wave detection perFormance was in- creased 6.8% compared with the QRS-T complex cancellation method without application of the rule base.

• Korean Journal of Mathematics
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• 제17권4호
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• pp.495-505
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• 2009

By means of Green function and fixed point theorem related with cone theoretic method we show that there exist multiple nonnegative solutions of a Dirichlet problem $$\array{-[p(t)x^{\prime}(t)]^{\prime}={\lambda}q(t)f(x(t)),\;t{\in}I=[0,\;T]\\x(0)=0=x(T)}$$, and a mixed problem $$\array{-[p(t)x^{\prime}(t)]^{\prime}={\mu}q(t)f(x(t)),\;t{\in}I=[0,\;T]\\x^{\prime}(0)=0=x(T)}$$, where ${\lambda}$ and ${\mu}$ are positive parameters.

• 대한수학회보
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• 제46권3호
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• pp.521-534
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• 2009

In this paper we present new large-update primal-dual interior point algorithms for $P_*$ linear complementarity problems(LAPS) based on a class of kernel functions, ${\psi}(t)={\frac{t^{p+1}-1}{p+1}}+{\frac{1}{\sigma}}(e^{{\sigma}(1-t)}-1)$, p $\in$ [0, 1], ${\sigma}{\geq}1$. It is the first to use this class of kernel functions in the complexity analysis of interior point method(IPM) for $P_*$ LAPS. We showed that if a strictly feasible starting point is available, then new large-update primal-dual interior point algorithms for $P_*$ LAPS have $O((1+2+\kappa)n^{{\frac{1}{p+1}}}lognlog{\frac{n}{\varepsilon}})$ complexity bound. When p = 1, we have $O((1+2\kappa)\sqrt{n}lognlog\frac{n}{\varepsilon})$ complexity which is so far the best known complexity for large-update methods.

• 대한기계학회논문집A
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• 제26권3호
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• pp.505-513
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• 2002

During heatup and cooldown of pressurized water reactor, thermal stress was generated in the reactor pressure vessel (RPV) because of the temperature gradient. To prevent potential failure of RPV, pressure was required to be maintained below the P-T limit curves. In this paper, several methods for constructing the P-T limit curves including the ASME Sec. XI, App. G method were explained and the results were compared. Then, the effects of the various parameters such as flaw size, flaw orientation, cooldown rate, existence of chad, and reference fracture toughness, were evaluated. It was found that the current ASME Sec. XI App. G method resulted in the most conservative P-T limit curve. As the more accurate fracture mechanics analysis results were used, some of the conservatism can be removed. Among the parameters analysed, reference flaw orientation and reference fracture toughness curve had the greatest effect on the resulting P-T limit curves.

• 동서간호학연구지
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• 제25권2호
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• pp.103-116
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• 2019

Purpose: This study investigated the effects of the Seogeum therapy among college students with allergic rhinitis. Method: A non-equivalent control group pretest-posttest non-synchronized design was used. Intervention of Seogeum therapy has been performed from March 2 through March 31, 2017. Sixty college students diagnosed with allergic rhinitis from two different colleges in B and K cities were assigned to the experimental and control group. Data analysis were conducted using descriptive statistics, chi-square test, Fisher's exact test, and t-test. Results: There were significant differences in nose itching (t=4.89, p<.001), sneezing (t=6.26, p<.001), watery rhinorrhea (t= 4.09, p<.001), nasal congestion (t=2.36, p=.022), the percent of eosinophil (t=2.01, p=.049), perceived stress (t=2.05, p=.045), and allergic rhinitis related quality of life (t=4.33, p<.001) between the two groups. However, there were no significant differences in the percent of IgE (t=0.60, p=.553) and level of cortisol (t=0.53, p=.598). Conclusion: The results of this study indicates that the self-management of Seogeum therapy improved physical and psychological status of the college students with allergic rhinitis which ultimately improved their quality of life.

• 근관절건강학회지
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• 제13권1호
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• pp.31-42
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• 2006

Purpose: The purpose of this study was to identify the effects of aquatic exercise program on physical fitness, pain and physiological function in patients with osteoarthritis. Method: The subjects of the study were thirty women(age: forty-seventy five) who have an osteoarthritis. Aquatic exercise program consist of approximately two hours of exercise in water, two days per week, for six weeks. Data were gathered from April 19 2005 to May 27 using a questionnaire and measuring physical fitness and physiological index. Data were analyzed with the SPSS Win 12.0 using frequency and paired t-test for difference between pre-exercise and post-exercise. Results: The results of this study were as follows: There were significantly increased on left shoulder (t=3.848, p=.001) and waist flexibility(t=-5.622, p=.001) scores. There were significantly decreased on pain score(t=5.288. p=.000), body weight(t=5.072, p=.001), systolic B.P(t=18.362, p=.001), diastolic B.P(t=32.558, p=.001), blood sugar(t=1.805, p=.041), total cholesterol(t=2.032, p=.026) scores. Conclusion: From these results, it is concluded that the aquatic exercise program can be effective in increasing physical fitness, physiological function and decreasing pain in patients with osteoarthritis.

• 한국가금학회지
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• 제35권2호
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• pp.171-176
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• 2008

본 시험은 동물 복지 차원에서 절식에 의한 강제 환우를 지양하고 사료를 급여하는 강제 환우 방법이 산란계의 생산성 및 난질에 미치는 영향을 알아보고자 60주령 White Leghorn 산란계 400수를 공시하여 34주간 실시하였다. 처리구는 관행적으로 절식한 환우구(C), 옥수수 단일 사료 급여(T1), 밀기울 단일 사료 급여(T2) 및 알팔파 단일 사료를 급여(T3)한 4처리로서, 처리구당 5반복, 반복당 20수씩 철제 케이지에 완전임의 배치하였다. 시험 결과 산란율 및 1일 산란량은 산란 후 $1{\sim}4$주간에만 T1에서 대조구에 비하여 유의적으로 감소하였으나(P<0.05), 전 시험 기간 동안에는 강제 환우 방법간에 차이를 보이지 않았다. 사료 섭취량은 $1{\sim}4$주에 T1에서 대조구에 비하여 통계적으로 감소하였으나(P<0.05), 전 시험 기간에는 처리구간에 차이가 없었다. 또한, 사료 요구율도 전 시험 기간 동안 처리구간에 유의적인 차이를 보이지 않았다. 난각 두께는 산란 후 10, 14주에 옥수수만을 급여한 T1구가 대조구에 비하여 유의적으로 개선되었으나(P<0.05), 26주에는 옥수수(T1)와 밀기울(T2)만을 급여한 처리구가 대조구에 비해 유의적으로 감소하였다(P<0.05). 난각 강도와 호우 유니트는 환우 방법에 따른 차이를 보이지 않았다. 난황색은 6주에 T1구와 T2구가 대조구에 비하여 유의적으로 감소하였으나(P<0.05), 18주에는 T1구와 T2구가 대조구나 T3구에 비하여 유의적으로 높았다(P<0.05). 시험 결과 사료 급여와 절식을 이용한 강제 환우 방법간에 생산성에서는 커다란 차이를 보이지 않았으며, 난질에서도 차이를 보이지는 않았다. 또한 사료 급여를 이용한 강제 환우에서는 알팔파만을 단독으로 급이한 강제 환우 방법이 옥수수나 밀기울을 급여한 강제 환우 방법보다는 생산성에서 통계적으로 유의차는 보이지 않았으나 우수한 경향을 보였다.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.272-280
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• 2003

A definite shut-in pressure in hydraulic fracturing techniques is needed for obtaining the correct information on the in-situ stress regimes in rock masses. The relation between the behaviour of hydraulically induced fractures and the condition of remote stress is considered to be major reasons of an ambiguous shut-in pressure in hydraulic fracturing pressure-time history curves. This paper describes the results of a series of numerical analyses carried out using UDEC(Universal Distinct Element Code, Itasca), which is based on the discrete element method, to compare several methods for determining the shut-in pressure during hydraulic fracturing. The fully coupling of hydraulic and mechanical analysis was applied, and the effects of four different discontinuity geometries in numerical modelling have been investigated for this purpose. The effects of different remote stress regimes and different physical properties on hydraulic fracture propagation have been also analyzed. Several methods for obtaining shut-in pressure from the ambiguous shut-in curves have been applied to all the numerical models. The graphical intersection methods, such as (P vs. t) method, (P vs. log(t)) method, (log(P) vs. log(t)) method, give smaller values of the shut-in pressure than the statistical method, (dP/dt vs. P). Care should be taken in selecting a method for shut-in pressure, because there can be existed a stress anomaly around the wellbore and fracturing from the wellbore by a constant flow rate may have a more complicate mechanism.

• 대한의용생체공학회:의공학회지
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• 제17권4호
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• pp.507-514
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• 1996

The automated ECG diagnostic systems in hospital have a low P-wave detection capacity in case of some diseases like conduction block. The purpose of this study is to improve the P-wave detection ca- pacity using wavelet transform. The first procedure is to remove baseline drift by subtracting the median filtered signal from the original signal. The second procedure is to cancel ECG's QRS-T complex from median filtered signal to get P-wave candidate. Before we subtracted the templete from QRS-T complex, we estimated the best matching between templete and QRS-T complex to minimize the error. Then, wavelet transform was applied to confirm P-wave. In particular, haiti wavelet was used to magnify P-wave that consisted of low frequency components and to reject high frequency noise of QRS-T complex cancelled signal. Finally, p-wave was discriminated and confirmed by threshold value. By using this method, We can got the around 95.1% P-wave detection. It was compared with contextual information.

• 한국방사선학회논문지
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• 제17권6호
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• pp.1009-1015
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• 2023

본 연구는 하브루타 학습법의 적용이 방사선과 대학생의 학업적 자기효능감, 학업성취도 및 의사소통능력에 미치는 효과를 검증하고자 시도된 단일군 사전-사후 실험연구이다. 본 연구는 2023년 5월 1일부터 6월 23일까지 진행되었으며 전라남도 1개 대학교 방사선과 2학년을 대상으로 방사선기기학을 수강하는 38명을 대상으로 6주 동안 하브루타 학습법을 적용하였다. 자료분석은 SPSS/WIN 21.0을 사용하였으며, 척도의 신뢰도를 검증하고 대상자의 일반적 특성, 측정변수에 대한 사전값과 사후값은 기술통계, 하브루타 학습법의 전과 후의 차이는 Paired t-test로 검증하였다. 연구결과 하브루타 학습법은 학업적 자기효능감(t=-2.70, p<.001), 학업성취도(t=-2.87, p=.006), 의사소통능력(t=-2.76, p=.008)에서 통계적으로 유의미한 차이를 보여주었다. 결과적으로 하브루타 학습법은 방사선과 대학생들의 학업적 자기효능감, 학업성취도 및 의사소통능력을 증진시키는 효과적인 학습법으로 확인되었다. 향후 하브루타 학습법의 확대 적용이 필요할 것이다.