• Communications for Statistical Applications and Methods
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• 제15권4호
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• pp.531-542
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• 2008

시계열 자료를 분석할 때, 시계열 자료가 가지고 있는 추세를 제거하기 위하여 결정적 추세인 경우 회귀모형을 이용하고, 확률적 추세인 경우 차분하는 방법을 이용한다. 이 때 제거의 옳바른 기준이 되는 검정 방법이 단위근 검정이다. 그러나 기존의 Dickey-Fuller 검정 (Dickey와 Fuller, 1979)은 표본 수가 작고, 단위근에 가까울 경우 검정력이 낮으며, 베이지안 단위근 검정은 절차가 복잡하다. 본 논문에서는 기존의 두 방법들의 문제점을 해결하기 위하여, 전통적 Dickey-Fuller 검정 방법과 베이지안 방법을 결합한 형태의 검정방법으로 제안하였다. 제안된 검정방법은 모형 AR(1)에서 계수가 거의 1이거나 표본 수가 작을 경우, 기존의 Dickey-Fuller 검정보다 검정력이 높을 뿐만 아니라 일반적인 베이지안 방법 보다 절차가 간단한 검정법이 된다.

• 재활치료과학
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• 제2권1호
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• pp.48-56
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• 2013

목적 : 국내 작업치료사들에 의해 가장 많이 사용되는 지필검사인 직선이분 검사 와 알버트 검사를 관찰을 통해 행동적 무시를 평가하는 CBS와 비교하여 상관관계를 살펴보고 편측무시에 대한 민감도가 더 높은 검사 도구를 알아보고자 하는 것이다. 방법 : 기준에 따라 선정된 좌측 편마비 환자 44명을 대상으로 CBS, 직선이분검사, 알버트 검사, K-MBI를 시행하여 편측무시 정도를 비교 분석하였다. 결과 : 관찰을 통한 행동적 무시 검사인 CBS는 지필검사인 직선이분 검사, 알버트 검사와 유의한 상관관계를 보였다(p < .01). CBS가 지필검사보다 편측무시에 대한 민감도가 더 높았고, 일상생활활동과 더 높은 상관관계를 보였다(p< .01). 결론 : 본 연구의 결과를 살펴볼 때 CBS가 지필검사에 비해 편측무시를 판별하기 더 유용하며 질병부인검사도 가능한 검사도구이다. 따라서 편측무시 검사와 치료 시 CBS의 적용이 고려되어야 할 것이다.

• 대한한의학방제학회지
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• 제19권1호
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• pp.183-194
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• 2011

Objectives : To estimate the shelf-life by long-term storage test of Pyungwi-san. Methods : Experiments were conducted to evaluate the stability such as the selected physicochemical, heavy metal, microbilogical experiment under an acceleration test and long-term storage test of Pyungwi-san in different storage under room temperature, refrigeration and freezing. Futhermore, HPLC analysis was performed for the determinations of glycyrrhizin in the Pyungwi-san on an Inertsil ODS-3 column(250 mm ${\times}$ 4.6 mm, 5 um) using solvent 35% acetonitrile include 0.05% phosphoric acid at 254 nm. The flow rate was 1.0 mL/min. Results : The significant change was not showed in pH, heavy metal, microbiological, identification test and quantitative analysis based on acceleration test and long-term storage test. Retention time of glycyrrhizin in HPLC chromatogram was about 16.065 min and calibration curve showed good linearity($R^2$ = 0.9999). The contents of glycyrrhizin in acceleration test and long-term storage test were 0.068~0.076 mg/mL and 0.066~0.077 mg/mL, respectively. Shelf-lifes of room temperature, refrigeration and freezing by long-term storage test were predicted 41, 24 and 34 months, respectively. Conclusions : The suggested shelf-life would be helpful on the storage and distribution of herbal medicine.

• 대한간호학회지
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• 제35권1호
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• pp.186-194
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• 2005

Purpose: The purpose of this study was to investigate the effect of aromatherapy on pain, depression, and feelings of satisfaction in life of arthritis patients. Method: This study used a quasi-experimental design with a non-equivalent control group, pre-and post-test. The sample consisted of 40 patients, enrolled in the Rheumatics Center, Kangnam St. Mary's Hospital, South Korea. The essential oils used were lavender, marjoram, eucalyptus, rosemary, and peppermint blended in proportions of 2:1:2:1:1. They were mixed with a carrier oil composed of almond (45%), apricot(45%), and jojoba oil(10%) and they were diluted to 1.5% after blending. The data were analyzed using an 2-test, Fisher's exact test, t-test and paired t-test. Result: Aromatherapy significantly decreased both the pain score and the depression score of the experimental group compared with the control group. However, aromatherapy didn't increase the feeling of satisfaction in life of the experimental group compared with the control group. Conclusion: The result of this study clearly shows that aromatherapy has major effects on decreasing pain and depression levels. Based on our experiment's findings, we suggest that aromatherapy can be a useful nursing intervention for arthritis patients.

• 한국정밀공학회지
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• 제18권4호
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• pp.151-159
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• 2001

As huge energy transfer systems like a nuclear power plant, steam power plant and petrochemical plant are operated for a long time, mechanical properties are changed by degradation. The life time of the systems can be affected by the mechanical properties. BI(Ball Indentation) test has a potential to replace conventional fracture tests like a uniaxial tensile test, fracture toughness test, hardness test and so on. In this paper, we would like to present the ageing evaluation technique by the BI method. The four classes of the thermally aged 1Cr-!mo-0.25V specimens were prepared using an artificially accelerated aging method. Tensile tests, fracture toughness tests, hardness tests and BI tests were performed. The results of the BI tests were in good agreement with fracture characteristics by a standard fracture test method within 5%. The IDE(Indentation Deformation Energy) of a BI technique as a new parameter for evaluating a degradation was suggested and the new IDE parameter clearly depicts the degradation degree.

• Applied Biological Chemistry
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• 제20권3호
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• pp.285-291
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• 1977

(가) 2개 이상(以上) t개의 시료(試料)를 3점기호척도시험법(點嗜好尺度試驗法)에 의해 실험한 결과를 통계처리(統計處理)하여 t개 시료 상호간(相互間)의 품질차(品質差)를 비교(比較)하는 해석법(解析法)에 대해서 검토(檢討) 하였다. (나) 그 결과 $Scheff{\acute{e}}'s$ method의 제1신법(第1新法)이 품질차(品質差)의 검출력(檢出力)에서나 얻어지는 정보량(情報量)에서 우수(優秀)함을 확인하고 t개의 시료에 대할 3점기호척도시험법(點嗜好尺度試驗法)의 해석방법(解析方法)으로써 실용성(實用性)이 있다는 결론을 얻었다. (다) 이때 correct oddity chosen에 대한 incorrec toddity chosen의 weight fraction은 chance probability에 의해 계산하여 1/2로 하였다.

• 전력전자학회논문지
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• 제5권5호
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• pp.515-521
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• 2000

본 논문은 전동차용 추진장치인 IGBT VVVF 인버터의 현차시험에 관한 것이다. IGBT VVVF인버터는 1,650kVA급으로 개발되었다. 추진 인버터의 신뢰성과 성능을 확인하기 위하여 서울시 지하철 6호선에서 본선시험을 하였다. 시험 차량구성은 4M4T로 구성되었으며, 전장품은 4대의 VVVF인버터, 16대의 견인전동기 및 2대의 SIV로 구성하였다. 추진장치는 1C4M으로 구성하였다. 현차시험을 통하여 추진용 인버터의 우수한 가·감속 능력과 가가속도 특성 및 구배에서의 등판능력을 확인 할 수 있었다.

• 한국수산과학회지
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• 제1권2호
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• pp.121-127
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• 1968

This research has been dealt with the nutritional component analysis of two kinds of non-edible marine algae, Sargassum herneri (Turner) C. Ag. and Zostera marina Linne which grow abundantly around the southern coast of Korea, These marine algae were mixed in several kinds of samples rates with the combined feed for poultry sold in the market. These were given to 35 chicken in seven test divisions respectively. We have experimented with 35 chicken grown up for two weeks after hatchout. The combined food for poultry obtained from the market was set up as control divisions. The experiments were as follows: 1) The average weight increase in each test division during feeding (Table 5, Fig.2). 2) Food conversion rate and food efficiency in each test division (Table 7). 3) The comparison of digestive rate of crude protein during feeding (Table 8), The results were as follows: 1) The weight increasing rate of the test animal stock fed the food containing $5\~10\%$ of Sargassum horneri (Turner) C. Ag. powder was higher than the rate of those fed only market food for poultry. 2) The stock given food containing $10\%$ Zostera marine powder showed lower growth than the control divison. 3) No apparent trouble owing to salt component involved in the marine algae was found. 4) The stock given food containing sodium glutaminate and Sargassum horneri (Turner) C. Ag. had better result than that without sodium glutaminate.

• Journal of Electrical Engineering and Technology
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• 제9권1호
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• pp.280-285
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• 2014

In order to evaluate the insulation deterioration in the stator windings of five gas turbine generators(137 MVA, 13.8 kV) which has been operated for more than 13 years, diagnostic test and AC dielectric breakdown test were performed at phases A, B and C. These tests included measurements of AC current, dissipation factor, partial discharge (PD) magnitude and capacitance. ${\Delta}I$ and ${\Delta}tan{\delta}$ in all three phases (A, B and C) of No. 1 generator stator windings showed that they were in good condition but PD magnitude indicated marginally serviceable and bad level to the insulation condition. Overall analysis of the results suggested that the generator stator windings were indicated serious insulation deterioration and patterns of the PD in all three phases were analyzed to be internal, slot and spark discharges. After the diagnostic test, an AC overvoltage test was performed by gradually increasing the voltage applied to the generator stator windings until electrical insulation failure occurred, in order to determine the breakdown voltage. The breakdown voltage at phases A, B and C of No. 1 generator stator windings failed at 28.0 kV, 17.9 kV, and 21.3 kV, respectively. The breakdown voltage was lower than that expected for good-quality windings (28.6 kV) in a 13.8kV class generator. In the AC dielectric breakdown and diagnostic tests, there was a strong correlation between the breakdown voltage and the voltage at which charging current increases abruptly ($P_{i1}$, $P_{i2}$).

• 한국해양학회지
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• 제13권1호
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• pp.35-43
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• 1978

Short-term acute toxicity of mercury, cadmium and copper to arkshell, Anadara broughtonii, and to oyster, Crassostrea gigas, was determinedby static bioassays from 20 May to 27 June in 1977. During the observations of the opening rate of the shell mercury was the most sensitive toxicant of the three toxic substances to the test animals and caused them to close their shellvalves together after being exposed to a mercury solution for an hour during the test. Opening rate to cadmium and copper increased gradually at the higher concentration. the 96hr-LC50 values for the test animals are 4.84mg/l for mercury and 1.86mg/l for cadmium, while the 72hr-LC50 value for copper is 0.31mg/l. the death rate of oysters for cadmium showed lower than that of the mercury and copper test solutions. The 96hr-LC50 values of mercury, copper and cadmium were 1.1mg/l, 2.54mg/l and 19.5mg/l, respectively. For oysters mercury was the most toxic substance, and cadmium was the least toxic one. the medium lethal time (LT 50) value decreased gradually at higher concentration of heavy metals. The LT 50 of 2mg/l was found within 96 hours ofr copper, 104 hours for mercury and 121 hours for cadmium. The lethal threshold concentrations for 7 days were found to be about 1mg/l for mercury and copper, and 2mg/l for cadmium.