• 청정기술
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• 제8권2호
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• pp.101-110
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• 2002

회전형 도장기기의 개발을 위한 설계, 해석, 기초실험 및 성능시험 체계를 정립하였다. 도장기기의 설계 요구조건으로부터 도장기기 구성 요소들의 설계사양을 결정하는 개념설계 모델을 제안하였고, 이를 이용하여 각각의 도장기기 구성 요소를 설계, 해석하는 과정을 제시하였다. 설계된 도장기기의 무화특성 및 도장성능을 관찰하기 위한 실험 및 시험 방법을 기술하였고, 측정절차 및 측정변수의 평가기준을 확립하였다. 본 연구의 도장기기 개발체계를 이용한 실제 도장기기 개발 적용 사례를 제시함으로서, 본 방법의 신뢰성을 확인하였다.

• 종양간호연구
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• 제7권2호
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• pp.162-168
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• 2007

Purpose: This study was aimed to compare two different kinds of pre-operational education methods on nursing care satisfaction and anxiety among family members of cancer patients. Methods: This research used a quasi-experimental design. A total of 80 patients participated in the study. Forty subjects who were in the experimental group were assigned to be received mobile text-information via cellular phone, whereas control group was given the direct messages from nurses during peri-operative time. Peri-operative family needs and anxiety were measured and analyzed by X2-test and t-test. Result: There was no statistically significant difference in the levels of peri-operative family needs satisfaction and the levels of state anxiety between the two groups (p= .05). Conclusion: Based upon these findings, the nursing intervention with cellular phone short message could be as effective as direct peri-operative information in reducing the level of state anxiety and in increasing of the level of nursing care satisfaction among the family members of cancer patients.

• 한국해양공학회지
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• 제13권2호통권32호
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• pp.90-98
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• 1999

Boiler high-temperature pipelines such as main steam pipe, header and steam drum in fossil power plants are degraded by creep damage due to severe operationg conditions like high temperature and high pressure for an extended period time. Such material degradation lead to various component faliures causing serious accidents at the plant. Conventional measurement techniques such as replica method, electric resistance method, and hardness test method have such disadvantages as complex preparation and measurement procedures, too many control parameters, and therefore, low practicality and they were applied only to component surfaces with good accessibility. In this study, both artificial creep degradation test using life prediction formula and frequency analysis by ultrasonic tests for their preparing creep degraded specimens have been carried out for the purpose of nondestructive evaluation for creep damage which can occur in high-temperature pipelline of fossil power plant. As a result of ultrasonic tests for crept specimens, we confirmed that the high frequency side spectra decrease and central frequency components shift to low frequency bans, and bandwiths decrease as increasing creep damage in backwall echoes.

• 대한인간공학회지
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• 제28권3호
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• pp.27-31
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• 2009

To evaluate the usability of a Kimchi refrigerator, we performed an evaluation test that consisted of an experiment and a post-hoc questionnaire survey. In this study, we focused on the older women who have less physical and cognitive ability than younger women. In physical usability, there was no significant difference between the older and the younger subject group. However, there was some significant statistical difference in the results of cognitive usability test. When the subjects debriefed their operations after finishing the experiment, the all subjects in the older group reported the difficulties in identifying the labels and icons in the control panel and in understanding operation sequences. Also, they couldn't learn and remember the operation procedures well. Based on the analysis of the video protocols, some causes of the problems were found and then several improvement ideas were suggested.

• Journal of Advanced Marine Engineering and Technology
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• 제26권6호
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• pp.653-660
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• 2002

In this study, the toughness was evaluated by using the instrumented Charpy impact testing procedures for A15083-O aluminum alloy used in the LNG carrying and storing tank. The specimens were GMAW welded with four different mixing shield gas ratios (Ar100%+He0%, Ar67%+He33%, Ar50%+He50%, and Ar33%+He67%), and tested at four different temperatures(+25, -30, -85, and $-196^{\circ}C$) in order to investigate the influence of the mixing shield gas ratio and the low temperature. The specimens were divided into base metal, weld metal, fusion line, and HAZ specimen according to the worked notch position. From experiment, the maximum load increased a little up to -$85^{\circ}C$ , and the maximum load and maximum displacement were shown the highest and the lowest at -$196^{\circ}C$ than the other test temperatures. The absorption energy of weld metal notched specimens was not nearly depends on test temperature and mixing shield gas ratio because the casting structure was formed in weld metal zone. In the other hand, the other specimens were shown that the lower temperature, the higher absorption energy slightly up to $-85^{\circ}C$ but the energy was decreased so mush at $-196^{\circ}C$.

• 대한조선학회논문집
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• 제29권4호
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• pp.132-145
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• 1992

추진 효율 향상을 위한 대칭형 전류 고정날개-프로펠러 추진시스템의 설계, 이론성능해석 및 모형시험 과정을 정리하였다. 프로펠러 후류에서의 회전방향 운동에너지 회수를 통한 추진효율 향상을 도모하기 위하여 프로펠러 전방에 반대방향의 회전 속도를 주기 위한 고정날개를 설치하였다. 모형시험 결과 대칭형 전류 고정날개 추진시스템이 단독프로펠러에 비하여 3%정도 추진효율의 향상이 있음을 확인하였다. 실선 장착시에는 선체 반류에서의 난류 강도증가 및 레이놀드수 증가에 따른 고정날개 표면에서의 박리현상 감소에 의하여 고정날개 항력계수가 감소할 것으로 추정되며 그에 따라 본 추진시스템의 추진효율 증가량이 더욱 커지리라 판단된다.

• Clinical and Experimental Reproductive Medicine
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• 제5권1_2호
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• pp.1-7
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• 1978

In order to estimate the human placental lactogen levels and its value as an indicator of placental function during the first half of normal pregnancy, we defermined HPL levels. in normal snbjects (No=40) from the 6th week to the 20th week of gestation For the determination of human placental lactogen in serum of normal pregnant women during the first half of prognancy, radioimmunoassay have been performed using Phadebas HPL Test kit. The range of 25ng to 800ng HPL/ml. were determined by the procedures using Phadbas HPL Test kit, which correspond to levels recorded throughout the first half of normal pregnancy. HPL was detected in the earliest pregnancy samples collected at 6 weeks but was generally present in minute amount during the first trimester of pregnancy, when the HPL level ranged from 25 ng/ml. to 0.86 ${\mu}g$/ml. The mean concentration of HPL increased gradually from only 0.03 ${\mu}g$/ml, at 6 weeks to 0.25 ${\mu}g$/ml, at 12 weeks of gestation, Subsequently the mean HPL value rose steeply from 0.25 ${\mu}g$/ml, at 12 weeks to 1.65 ${\mu}g$/ml, at 20 weeks of gestation.

• 한국추진공학회지
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• 제8권4호
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• pp.84-90
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• 2004

추진제 주입압력 350 psia 에서 0.95 lbf 의 정상상태 공칭추력을 내는 단일액체추진제 하이드라진 추력기의 성능평가 결과를 추력, 임펄스 비트, 비추력 등을 통하여 제시한다. 연소시험 형상과 절차에 대한 간략한 묘사와 더불어 정상상태 연소모드로부터 얻어지는 추진제 공급압력. 질량유량, 추력기 작동환경 진공도, 그리고 추력 등의 변이거동에 대한 전형적인 결과를 검토한다. 제시된 추력기 성능은 1-lbf급 표준형 단일추진제 로켓엔진의 기준성능에 성공적으로 비교된다. 선별된 추력기군을 위성체 추진시스템의 비행모델로 채택하기 위한 추력기간 성능편차에 대해 부연한다.

• 한방안이비인후피부과학회지
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• 제22권1호
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• pp.133-140
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• 2009

Objective : To evaluate autonomic nerve balance and sympathetic nerve activity in patients with inner ear dysfunction as examined by heart rate variability(HRV) Research Methods and Procedures : One hundred and twenty three patients(between 15 to 59 years old) who visited Dept. of Oriental medical Opthalmology & Otolaryngology, Kyunghee university and had an examination of HRV test, were selected as subjects of our study. We checked items of HRV test(such as SDNN, RMSSD, LF, HF, TP, norm-LF, norm-HF, LF/HF ratio), and analyzed time and frequency domain differences between three groups classified as tinnitus, hearing loss and vertigo. And we compared HRV items(such as SDNN,RMSSD, TP and LF/HF ratio) with standard levels. Results and Conclusion : Our results showed no significant differences between three groups in HRV items except for mean heart rate. Patients with inner ear dysfunction showed significant lower TP than 2000$(ms^{2})$(p <0.001) and significant higher LF/HF ratio than 1.5(p=0.003). So we suggest that patients with inner ear dysfunctions such as tinnitus, vertigo and hearing loss, have sympathetic hypertonus and inactivity of autonomic nerve regulation.

• 초등상담연구
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• 제4권1호
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• pp.167-190
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• 2005

The purpose of this study was to develop the cognitive behavioral group counseling program to relieve elementary children of speech anxiety and to examine its effects. The program was developed on the basis of the cognitive, affective, and behavioral activities. The cognitive activities were based on the REBT procedures, and affective activities included making child's nickname, finding out his own strengths and exchanging positive feedback each other and behavioral activities included training assertiveness, coaching and practicing speech behavior etc, Subjects were 14 elementary children from M elementary school in Gwangju. They had the highest scores at the speech anxiety test which was administrated to all the sixth graders of M elementary school. Seven subjects were randomly allocated to experimental group and control group respectively. Two speech anxiety tests and one speech behavior checklist were administrated as pre- and post-tests. The collected data was analyzed by ANCOVA. Research results demonstrated that the experimental group showed statistically significant changes in the scores of the speech anxiety test and the speech behavior checklist comparing with the control group. Then it was accepted that the program which was developed in this study could make effects on the reduction of elementary children's speech anxiety.