• Journal of the Korean Statistical Society
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• 제5권1호
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• pp.3-18
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• 1976

To test simultaneous significance of more than two linear regression coefficients, we can consider multivariate-t tests with critical regions in t-space instead of F-tests where t-values are t-statistics of significance tests of one coefficient. In this paper bivariate-t distributions and bivariate-t tests of two coefficients such as maxmod, minmod, one-tailed maxmod and one-tailed minmod tests are studied. Through the calculation of powers of test, it is learned that in some cases bivariate-t test are more powerful than F-tests.

• Journal of Mechanical Science and Technology
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• 제19권2호
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• pp.496-504
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• 2005

The thermal and mechanical properties of an electro-slag cast steel of a similar chemical composition with an AISI-6F2 steel are investigated and compared with a forged AISI-6F2 steel. AISI-6F2 is a hot-working tool steel. Electro-slag casting (ESC) is a method of producing ingots in a water-cooled metal mold by the heat generated in an electrically conductive slag when current passes through a consumable electrode. The ESC method provides the possibility of producing material for the high quality hot-working tools and ingots directly into a desirable shape. In the present study, the thermal and mechanical properties of yield strength, tensile strength, hardness, impact toughness, wear resistance, thermal fatigue resistance, and thermal shock resistance for electro-slag cast and forged steel are experimentally measured for both annealed and quenched and tempered heat treatment conditions. It has been found that the electro-slag cast steel has comparable thermal and mechanical properties to the forged steel.

• Journal of Ginseng Research
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• 제17권1호
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• pp.22-28
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• 1993

This study was undertaken to determine the effects of ginseng total saponin (GTS) on stress- induced analgesia (SIA) in mice. intermittent foot shock (FS)-SIA was antagonized not by on but by naloxone in the tail flick FS-SIA which was not antagonized by naloxone in the T.F. test. On the other hand, GTS did not antagonize the continuous FS-SIA naloxone antagonized in the T.P. test. Also GTS antagonized psychological (PSIF)-SIA which was not antagonized by naloxone in the T.F. test. However, GTS did not antagonize the PSY-SIA which naloxone antagonized in the T.P. test. Forced swimming (FSIP)-SIA was not affected by both GTS and naloxone. These results suggest that the antapeonisms of intermittent FS-SIA in the T.F. test, continuous FS-SIA and PSY-SIA by GTS are mediated by non-opioid mechanisms but the antagonism of intermittent FS-SIA in the T.P. test by GTS is mediated by opioid mechanism.

• 한국간호교육학회지
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• 제29권4호
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• pp.427-439
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• 2023

Purpose: This study aimed to evaluate the effects of a nursing education program for hyperglycemia patient care using standardized patients. Methods: This study used a nonequivalent control group pre-test and post-test non-synchronized design. A total of 50 senior university nursing students who had completed an adult nursing course participated in this study (experimental group, n=24; control group, n=26). This nursing education program was developed according to the stages of analysis, design, development, implementation, and evaluation. The collected data were analyzed using χ² -test, Fisher's exact test, independent t-test, paired t-test, and repeated measure ANOVA. Results: Significant differences were shown between the experimental and control groups in clinical performance ability (F=277.41, p<.001), communication skills (F=47.18, p<.001), self-efficacy (F=3.81, p=.031), and learning satisfaction (t=2.25, p=.033). Problem-solving ability was not statistically significant between the groups. Conclusion: The nursing education program for hyperglycemia patient care using standardized patients was effective in improving nursing students' clinical performance ability, communication skills, and learning satisfaction. Therefore, it is proposed that the education program developed in this study be used as part of an education program to enhance nursing students' abilities in caring for hyperglycemia patients.

• 지역사회간호학회지
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• 제21권4호
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• pp.522-531
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• 2010

Purpose: The purpose of this study was to examine the effects of knowledge about the harmfulness of smoking and attitude toward smoking temptation for middle school students. Methods: A survey was conducted in this study on 745 students from 12 middle schools in the Y City. Data were analyzed with SPSS/WIN 12.0 using descriptive statistics, t?test, ANCOVA, Scheffe's test and multiple regression analysis. Results: There was statistically significant difference in knowledge about the harmfulness of smoking (F=2.88, p<.05) and attitude toward smoking (F=54.61, p<.001). And there was statistically significant difference in smoking temptations among tempting factors such as negative mood of individual (F=63.61, p<.001), positive mood of social situation (F=67.08, p<.001), habitualness (F=57.68, p<.001), weight control (F=33.01, p<.001), and others' smoking (F=73.13, p<.001). Conclusion: These results suggest that smoking?cessation programs to enhance the effectiveness of nursing interventions should be tailored to the level of smoking temptation and that educational programs should be developed for middle school students.

• Applied Biological Chemistry
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• 제43권3호
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• pp.213-217
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• 2000

감잎(Diospyros kaki folium)으로부터 폴리페놀 화합물을 분리하여 중금속 제거효과의 동물실험을 통한 안전성 및 기능성을 검토하였다. 카드뮴을 단독 투여한 대조군에 대하여 카드뮴에 감잎을 병합 투여한 F-1군과 F-2군 모두 식이섭취량은 1% 수준에서 유의적으로 감소하였고, 체중증가량은 카드뮴이 식이에 첨가됨으로써 실험동물의 성장에 영향을 끼쳤으며, 식이효율은 카드뮴 단독 투여군에 대하여 F-1군과 F-2군 모두에서 유의적인 차이가 나타나지 않았다. 간, 신장 그리고 대퇴골의 카드뮴 함량을 분석한 결과, 카드뮴을 단독 투여한 대조군에 대하여 F-1군과 F-2군 모두 1% 수준에서 유의적으로 감소하였다. 간에서는 F-1군이 25%, F-2군은 28%씩 감소하였고, 신장에서는 F-1군이 22%, F-2군이 25%씩 감소하였고, 대퇴골에 있어서의 카드뮴은 F-1군이 53%, F-2군은 59% 감소하였다. 변의 카드뮴 함량을 분석한 결과 대조군에 대하여 F-1군과 F-2군 모두 1% 수준에서 유의적으로 증가하였으며, F-1군이 42% 그리고 F-2군은 54%증가하였다. 위 결과로 미루어 볼 때 폴리페놀 화합물의 카드뮴 제거효과를 관찰할 수 있었다.

• 지역사회간호학회지
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• 제19권1호
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• pp.27-35
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• 2008

Purpose: The purpose of this study was to examine the effects of aroma-inhalation on depression, sleep, mood, and smell in stroke patients and their caregivers. Method: This study employed one group pretest-posttest repeated design. Data were collected at three time points: baseline(pre-test), 10 days and 20 days after the intervention(Post-test1 and post-test2, respectively). The sample included a total of 23 subjects. Data were analyzed by SPSS 12.0 program using repeated measure ANOVA. Results: Depression was not statistically significant difference among pre-test, post-test1 and post-test2. Sleep was improved after intervention $37.61{\pm}7.41$(pre-test), $41.22{\pm}8.26$ (post-test1), $44.33{\pm}7.67$(post-test2) (F=8.182. p=.001) Mood was significantly improved after intervention: $16.95{\pm}4.89$(pre-test), $14.89{\pm}6.31$(post-test1), $12.11{\pm}5.04$(post-test2). Smell including smell perception, discomfort due to smell and relation between age and smell was significantly improved after intervention: $2.63{\pm}1.20$ (pre-test). $2.00{\pm}1.16$(post-test1), $1.63{\pm}.96$(post-test2) (F=6.176. p=.006) in smell perception, $2.50{\pm}1.10$ (pre-test). $1.81{\pm}.91$(post-test1), $1.19{\pm}.40$(post-test2) (F=12.26. p=.000) in discomfort due to smell and $3.53{\pm}1.18$(pre-test). $2.59{\pm}1.46$(post-test1), $2.53{\pm}1.33$(post-test2) (F=4.148, p=.025) in relation between age and smell. Conclusion: The results suggest that aroma-inhalation may have an effect on sleep, mood and smell and can be effective nursing intervention to increase the relaxation in stroke patients and their caregivers.

• 대한간호학회지
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• 제30권2호
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• pp.380-390
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• 2000

This study was performed to evaluate the effectiveness of music therapy as one of the psychiatric nursing intervention tools, with addtional information in relieving anxiety during the procedure. Data were collected through nonequivalent pre-and post tests from July 1, 1998 to September 30 1998 in 90 patients (test group A: 28 patients, test group B: 27 patients, control group: 33 patients) who were hospitalized in DongSan Medical Center in order to have cardiac catheterization. The Subjects were informed by educational videos, which were modified according to the sensory information of the 10 study patients. They were based on the informative booklet by Kim keum-soon (1989). The procedural information was also modified according to the hospital`s customs. Provided the music for patients suitable to their tastes, and measured their blood pressure, heart rate, the degree of anxiety using the Spielberger`s measurement device of anxiety, and behavioral response of Finesilver`s. The statistical significance was analyzed using chi-square test and ANOVA. The results of this study were as follows : Hypothesis 1 : There are significant differences in the degree of anxiety among test group A, Test group A was provided only information, Test group B was provided information and the control group was provided neither. Hypothesis 2 : There are significant differences in systolic blood pressure among test group A, test group B, and control group.: non-significant. Hypothesis 3 : There are significant differences in diastolic blood pressure among test group A, test group B, and control group.: significant(F=1.31, p=.27, interaction; F=3.80, p=.00). Hypothesis 4 : There are significant differences in heart rate among test group A, test group B, and control group.: non-significant. Hypothesis 5 : There are significant differences in behavioral responses among test group A, test group B, and control group.: significant(F=10.05, p=.00). Further validation study is required with other subjects and other settings.

• 방송공학회논문지
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• 제25권2호
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• pp.185-191
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• 2020

MPEG-I에서는 최대 6자유도(6DoF)를 가지는 몰입형 비디오의 압축 표준화를 진행하고 있다. 360 비디오에 움직임 시차(parallax)를 추가한 것으로 정의되는 3DoF+ 비디오의 가상 공간에서, 원하는 위치와 시점의 장면을 제공하려면 3DoF+ 비디오를 구성하는 여러 뷰(view) 비디오를 사용하여 임의의 원하는 시점의 뷰를 렌더링해야 한다. MPEG-I 비쥬얼 그룹에서는 이러한 3DoF+ 비디오의 효율적인 부호화를 위한 표준화가 진행되고 있으며, TMIV(Test Model for Immersive Video)라는 시험모델을 개발하고 있다. 본 논문은 TMIV에서 패치(patch)를 아틀라스(atlas)에 효율적으로 패킹하여 부호화 성능을 향상시킬 수 있는 패치 패킹 방법을 제안한다. 제안기법은 패킹되는 패치들 간에 보호대역(guardband)을 적용하여 패치 간의 거리를 둠으로써 부호화로 인해 발생할 수 있는 아티팩트(artifact)를 줄여 최종 복원 뷰의 화질을 향상시킨다.

• 대한토목학회논문집
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• 제28권2A호
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• pp.165-170
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• 2008

각국의 강구조물 시공현장에서 사용되고 있는 고장력볼트의 인장강도는 일반적으로 1,000 MPa급이 주종을 이루고 있으나, 고강도강과 극후판의 개발과 교량 지간의 장대화로 인하여 강도가 큰 새로운 볼트 개발이 요구되고 있다. 한편, 반복적인 하중이 작용하는 곳에서 인장연결부에 사용되는 고장력볼트에 인장피로파괴 사례가 발생되고 있으나 아직까지 우리나라에서는 이에 대한 이론 및 실험적인 연구가 없는 실정이다. 따라서, 본 연구에서는 현재 일반적으로 사용하고 있는 F8T, F10T볼트와 새로이 개발된 F13T, F13T-N볼트에 대해서 인장피로실험을 수행하였다. 고장력볼트에 대한 피로강도평가는 반복횟수 200만회에 95% 하한신뢰도분석을 하여 수행하였고, 이를 기초로 3가지의 피로강도 기준안을 제시하였다. 또한, KS나사형상의 볼트와 새로이 제안된 나사선 형상의 볼트에 대한 피로강도에 대해서 비교 검토하였다.