• 임상간호연구
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• 제25권1호
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• pp.80-90
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• 2019

Purpose: The aim of this study was to identify the research trends of articles published in the Journal of Korean Clinical Nursing Research from 2000 to 2017 by a text network analysis using keywords. Methods: This study analyzed 600 articles. The R program was used for text mining that extracted frequency, centrality rank, and keyword network. Results: From 2000 to 2009, keywords with high-frequency were 'nurse', 'pain', 'anxiety', 'knowledge', 'attitude', and so on. 'Pain', 'nurse', and 'knowledge' showed a high centrality. 'Fatigue' showed no high frequency but a high centrality. Keywords such as 'nurse', 'knowledge', and 'pain' also showed high frequency and centrality between 2010 and 2017. 'Hemodialysis' and 'intensive care unit' were added to keywords with high frequency and centrality during the period. Conclusion: The frequency and centrality of keywords such as 'nurse', 'pain', 'knowledge', 'hemodialysis', and 'intensive care unit' reflect the research trends in clinical nursing between 2000 and 2017. Further studies need to expand the keyword networks by connecting the main keywords.

• 한국환경과학회지
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• 제29권5호
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• pp.541-549
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• 2020

In this study, standard precipitation index- based analysis associated with run theory was performed using 53 years' (1967-2019) precipitation data to investigate the meteorological drought in Chuncheon. The duration of the meteorological drought in Chuncheon was 8.06 months, magnitude of the drought was -8.21, and average drought depth was -1.08. The drought in May 2014 lasted 21 months until January 2016; the drought scale and average depth was -34.06 and -1.62, respectively. This was the most severe drought in Chuncheon. As a result of drought frequency analysis, the drought scale of May to December in 2014 was estimated to be -16.16, and the return period was estimated to be 300 years. These results are expected to further increase the magnitude and frequency of weather droughts caused by climate change. Therefore, it is critical to prepare appropriate structural measures.

• 예술인문사회 융합 멀티미디어 논문지
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• 제7권4호
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• pp.235-242
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• 2017

본 논문은 음성 신호의 Average Magnitude Difference Function (AMDF)에서 peaks (혹은 nulls)들을 찾는 알고리즘들을 제안하였다. AMDF 함수는 Autocorrelation Function (ACF)과 같이 음성 신호의 피치를 추정하는 함수로 널리 사용 하고 있다. 음성신호에서 fundamental frequency (F0)를 estimation하는 것은 매우 중요한 task이며 또한 상당한 어려움이 따른다는 것이 여러 연구들을 통해서 잘 알려진 사실이다. 본 논문에서는 AMDF 함수의 특성을 이용하여 개발한 두 가지의 알고리즘을 제시하였다. 첫째는 Local Minima에 Threshold 값을 적용하여 피치 주기를 측정 할 수 있는 nulls들을 찾아내는 알고리즘이고, 다음은 AMDF 함수와 ACF 함수 사이의 관계식을 응용한 알고리즘이다. 한국어의 감정 표현 언어들로 구성된 제시문을 널리 사용하고 있는 상용 기기로 녹음한 음성 신호를 본 논문이 제안한 알고리즘들에 적용하여서 시뮬레이션을 통해 음성 신호의 피치 주기를 측정하여서 그 성능을 알아보았다.

• Journal of Acupuncture Research
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• 제23권6호
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• pp.9-18
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• 2006

Objectives : This study was designed to evaluate the influence of postauricular pain on Bell's palsy patients. Methods : We investigated 71 cases of patients with Bell's palsy and classified them as existence of Postauricural pain, 71 patients were sequentially interviewed and examined. We evaluated the treatment effect of each group by using Gross Grading System of House-Brackmann(H-B grade) before treatment and after final treatment and we researched differences of sequelae of Bell's palsy, period of treatment, changing point -period from onset of Bell's palsy to the day which the change begins to be seen at the face- and improvement -period which Bell's palsy is improved from onset to H-B gradeII. Results : 1. In age, sex, lesion, duration of disease, we found that two groups have no significant differences. 2. In improvement and period of treatment, we found that two groups have significant differences. In changing-point, we found that two groups had the difference of the average, but they were not statistically significant. 3. As a result of evaluation by using H-B grade, treatment score after final treatment was marked higher than that before treatment within each group. 4. After final treatment, Non-postauricular pain group had significant difference(result) on H-B grade compared with Postauricular pain group. 5. In frequency of sequelae symptoms of Bell's palsy, Postauricular pain group had more higher compared with Non-postauricular pain group. Conclusion : These results suggested that Non postauricular pain group should be get better than Postauricular pain group.

• 한국환경과학회지
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• 제28권10호
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• pp.863-872
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• 2019

Using the Standard Precipitation Index (SPI), this study analyzed the drought characteristics of ten weather stations in Gyeongbuk, South Korea, that precipitation data over a period of 30 years. For the number of months that had a SPI of -1.0 or less, the drought occurrence index was calculated and a maximum shortage months, resilience and vulnerability in each weather station were analyzed. According to the analysis, in terms of vulnerability, the weather stations with acute short-term drought were Andong, Bonghwa, Moongyeong, and Gumi. The weather stations with acute medium-term drought were Daegu and Uljin. Finally the weather stations with acute long-term drought were Pohang, Youngdeok, and Youngju. In terms of severe drought frequency, the stations with relatively high frequency of mid-term droughts were Andong, Bonghwa, Daegu, Uiseong, Uljin, and Youngju. Gumi station had high frequency of short-term droughts. Pohang station had severe short-term ad long-term droughts. Youngdeok had severe droughts during all the terms. Based on the analysis results, it is inferred that the size of the drought should be evaluated depending on how serious vulnerability, resilience, and drought index are. Through proper evaluation of drought, it is possible to take systematic measures for the duration of the drought.

• 한국인터넷방송통신학회논문지
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• 제17권4호
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• pp.149-154
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• 2017

스마트폰과 같은 모바일 기기는 입력으로부터 결과를 확인하기까지의 반응시간이 짧을수록 기기의 체감성능이 높아진다. 애플리케이션의 반응시간을 짧게 할 수 있다면 이러한 체감성능을 높일 수 있게 된다. 이에 관련하여 온디맨드 거버너는 주파수를 바꿀 때 샘플링 간격으로 인한 약점이 있어 프로그램의 실행을 느리게 할 수 있다. 이에 본 논문에서는 애플리케이션의 실행에 맞춰 온디맨드 거버너의 샘플링 주기를 가변시키는 기법을 제안한다. 기법의 적용에 따라 실행시간과 전력소모량을 비교한 결과, 프로그램의 실행 체감성능에 연관되는 초기실행시간 부분에 대하여 3.34% 개선되는 것을 확인할 수 있었으며, 가변적 샘플링 주기에 따른 기기의 전체적인 전력소모량의 차이는 유의미하게 나타나지 않았다.

• 한국음향학회지
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• 제31권8호
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• pp.561-568
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• 2012

본 연구는 등가 종 모델을 이용하여 한국종의 맥놀이 주기를 조절하는 방법을 제시한다. 한국종이 갖고 있는 미세한 비대칭성은 하나의 원주 모드를 미세한 주파수의 차이를 갖는 모드 쌍으로 분리시키는데, 이 모드 쌍의 상호간섭에 의해서 진동과 음향의 맥놀이가 발생한다. 등가 종은 축대칭 종에 등가 집중질량을 부착시킨 미소 비대칭 구조물로, 실제 종의 모드 쌍과 동일한 모드 특성을 갖는다. 등가 종 모델은 회전 쉘 이론을 근거로, 유한요소해석을 통해서 구성된다. 맥놀이 특성을 변화시키기 위하여 국부적으로 요소 두께를 감소시킬 때, 등가 종을 이용하여 맥놀이 주기를 예측한다. 예측 결과는 시험 종에 대한 실험을 통해 그 타당성을 확인한다. 본 방법은 대형 종의 맥놀이 주기 조절에 소요되는 시간을 크게 줄일 수 있을 것이다.

• 센서학회지
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• 제26권4호
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• pp.251-258
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• 2017

According to recent studies by scientists about how to search for food, homes and the mates, it is found that the gradient information plays a key role. From cells to insects and large animals, they mostly either have special sensing organism or use a strategy to measure the gradient. Use of a perturbation as an additional input is introduced for sensor signal processing in order to get the gradient information. Different from typical approach, which calculates the gradient from differentiation, the proposed processing is done by a form of integration, thus it is very robust to noise. Discrete time domain analyses are given for one, two and three input functions for the estimation of the gradients. The amplitude and the frequency of the perturbation are two important parameters for this approach. A quantitative index to measure the effects of the amplitude is developed based on the linear regression analysis. The frequency of the perturbation is to be selected high enough to finish one period of the perturbation before the property is changed significantly with respect to time. Another quantitative index is proposed for guiding the selection of the frequency.

• 한국태양에너지학회 논문집
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• 제28권1호
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• pp.83-89
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• 2008

This paper presents the characteristics of lightning pver Jeju island and a case of emergency stop of a wind turbine due to lightning. Using the IMPACT ESP sensor to detect lightning, the data on lightning frequency, lightning strength, regional lightning event were obtained and analyzed in detail. The measurement period was for 3 years from 2004 to 2006. As a result, lightning occulted the most frequently in July and August. As for lightning strength, lightning with grades -4 to -6 and +3 to +5 occur ed more frequently. The eastern part of Jeju island had much more lightning frequency compared with the western part of it. Lightning with high grade occurred mainly in offshore site and the coastal region. Furthermore, the data on wind turbine stop caused by lightning was analyzed. Although wind turbine lightning damage was not much in this study, the investigation on lightning damage or lightning faults to a wind turbine should be conducted in Korea to increase availability of wind turbine.

• 아태비즈니스연구
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• 제4권2호
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• pp.41-53
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• 2013

Undoubtedly, the basic sinking fund formula gives the future value of a series of equal installments. The main underlying assumption for using this formula is that installment and compounding frequency must be in equal interval. But when installment for a deposit scheme or any other savings scheme and compounding frequency do not occur in an equal interval, which is treated as the complex annuity problems in Finance Literature, the basic sinking fund formula does not give the accurate result. As a result, the obtainable amount from different deposit schemes offered by different banks and financial institutions does not match with the amount of future value calculated through the basic sinking fund formula by the investors or savers. This study focuses the concealed facts for such type of mismatches in values and at the same time it provides a solution through developing a new formula by extending the basic formula intended not only to remove those mismatches but also get the accurate future value from a sinking fund provision in case of complex annuity. Besides, since banks and financial institutions calculate the interest on the average amount of equal installments deposited within a period of time due to complex annuity, the study also formulates an arithmetic formula for calculating the average amount of installment.