• 센서학회지
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• 제23권4호
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• pp.229-233
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• 2014

In this study, a V-grooved single-mode fiber along with optical time domain reflectometry (OTDR) as a quasi-distributed temperature sensor was investigated. The external medium used to fill the V-groove affects the optical mode. The V-groove was filled with ethylene vinyl acetate (EVA) because its transmittance was sensitive to temperature. The experimental results showed that the optical loss of the sensor varies with temperature, and the sensitivity depends on the depth of the V-groove.

• 한국추진공학회:학술대회논문집
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• 한국추진공학회 2011년도 제37회 추계학술대회논문집
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• pp.92-95
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• 2011

케로신-산소 동축 로켓 분사기의 난류 연소를 수치적으로 연구하였다. 이 연구를 위하여 다단 준 총괄 반응 기구를 개발하였다. 이 반응 기구는 가상의 케로신 연료가 수소와 일산화 탄소로 분해된 이후 고온 영역의 상세 산화 반응들로 구성되어 있다. 난류 연소의 LES 해석을 위하여 5차의 WENO 기법을 이용하였다. 반응 및 비 반응 유동의 난류 특성을 살펴 보았으며 리세스의 존재가 난류의 생성과 연소에 미치는 영향을 살펴보는 심화 연구를 수행하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2015년도 제46회 하계학술대회
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• pp.980-981
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• 2015

A quasi-resonant flyback converter using a simple 8-bit microcontroller for a LED lighting is proposed in this paper. The proposed converter is easily and precisely controlled by the simple controller using a low-cost 8-bit microcontroller. Also, in order to operate the 8-bit microcontroller, the proposed converter system does not require any additional power supply for the controller. A prototype power supply is developed to supply a 270[W] LED lighting with the wide input voltage ranges ($175[V_{ac}]-265[V_{ac}]$). Experimental results will be show the practicality and validity of the proposed circuit.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집B
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• pp.246-251
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• 2000

In the present study, the analysis on heat and fluid flow in the single screw extruder is carried out by simultaneously considering the metering section and the die. The finite difference method and the finite volume method are applied to the metering section and the die, respectively. The zonal method is used to couple the metering section and the die. To investigate the effect of die on the characteristics of heat and fluid flow in the single screw extruder, the pressure back flow is included in the analysis. The screw-tip rotation is also considered by employing the quasi 3-dimensional die model. The present results are compared with the numerical and experimental data available in the literatures.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1998년도 가을 학술발표대회 논문집(III)
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• pp.615-620
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• 1998

The objective of this experimental study is to investigate the hysteretic behavior of reinforced concrete piers subjected to quasi-static cyclic loads, which have been used in large numbers for railway and urban transportation facilities. Important test parameters are hoop ratio, axial load, loading type, and the behaviors f members have been evaluated through limit states of crack occurrence, yielding and ultimate state of member, ductility and load-deflection loop can be secured by considering the influence of hoop reinforcement ratio and axial load, and that plastic hinge length and ductility ar determined by the combination of the quantities of hoop reinforcement and axial load.

• 성인간호학회지
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• 제17권1호
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• pp.77-87
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• 2005

Purpose: The purpose of this study was to examine the effect of balance taping procedures on lower back pain. Method: This study is nonequivalent control group pretest-posttest design of quasi-experimental study. From May in 2004 to July in 2004, the research was done for females who have lower back pain in Gyeonggi province. Experimental group was 37, and control group was 36. The degree of lower back pain and that of the pain on activity of daily living(ADL) were each measured two times. Result: In the experimental group, the lower back pain score before taping was 6.38, that of 1 hour after the taping applied was 3.27. The lower back pain score of experimental group was significant statistically decreased and that of control group was almost not changed. Moreover, the pain score on ADL was statistically decreased in experimental group. Therefore balance taping is effective to reduce lower back pain and to improve ability of ADL. Conclusion: This study supports that balance taping may benefit individuals with lower back pain and balance taping therapy can be used as an independent nursing intervention. However, a larger study is in need to provide definite evidence and to determine long-term effects.

• 근관절건강학회지
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• 제13권1호
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• pp.43-52
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• 2006

Objective: The purpose of this study was to determine the effect of stretching exercise on depression, pain, and fatigue in patients with systemic lupus erythematosus(SLE). Methods: The study was designed as a non-equivalent control group pre-posttest quasi-experimental design. The patients with SLE who signed the consent form were conveniently assigned into two groups(11 experimental subjects and 10 control subjects). The subjects in the experimental group were participated in 6 weeks stretching exercise program for one and a half hours per session twice a week. The data were analyzed by using a SAS-pc+ 8.01 program. Results: 'The experimental group would have less depression scores than the control group' was supported (Z=2.2, p=.025). 'The experimental group would have less pain scores than the control group' was supported (Z=3.4, p=.001). 'The experimental group would have less fatigue scores than the control group' was supported (Z=-2.0, p=.041). With this study, we identified the stretching exercise program was effective on depression, pain, and fatigue of SLE patients. Conclusions: From above results, 6 weeks stretching exercise program could be an effective nursing intervention to reduce depression, pain, and fatigue in patients with SLE.

• 기본간호학회지
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• 제17권4호
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• pp.498-507
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• 2010

Purpose: The purpose of this study was to evaluate the effects of preoperative PCA (Patient-Controlled Analgesia) education on pain, patient attitude, and patient satisfaction in surgical patients. Methods: The study was a quasi-experimental research design. The participants were 54 patients who were admitted for surgery at I hospital in G city, Korea. Of the 54 patients, 26 were assigned to the experimental group and the rest to the control group. The PCA education was provided in the nurses' station, individually to patients in the experimental group the day before their operation. Multimedia and brochure, and a real PCA model were used. The control group received only verbal education about PCA. Results: The postoperative pain scores were significantly different for lapse of time in the experimental group compare to the control group. Patient attitude toward using pain medicine was significantly more positive in the experimental group than in the control group. The postoperative patient satisfaction with pain management was significantly higher in the experimental group than in the control group. Conclusion: The study findings indicate that preoperative PCA education could be an effective nursing intervention for pain management of surgical patients.

• 대한간호학회지
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• 제33권1호
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• pp.79-86
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• 2003

Purpose: The purpose of this study was to identify the effects of Koryo Hand-Acupuncture on health status(pain, trunk flexion, IADL, depression) of patients with chronic low back pain. Method: This study used a quasi experimental pre-test and post-test design. Data were collected from December 1st, 2000 to December 20th, 2001. 63 chronic low back pain patients(35 experimental group, 28 control group) admitted to the Back-School and consented to this study. The experimental group participated in treatment: Koryo Hand-Acupuncture and AB-Bong. Two groups was homogeneity. After 4 weeks the effects of treatment on the health status was measured between experimental and control group. Data were analyzed using SPSSWIN 10.0 with crosstab, t-test, and paired t-test. Result: In the experimental group, pain(t=4.85, p=.000) and IADL difficulty(t=2.05, p=.045) was significantly lower than those in the control group. It makes no difference trunk flexion(t=-1.60, p=.114) and depression(t=1.50, p=.138) between experimental and control group. Conclusion: These findings indicate that Koryo-Hand Acupuncture is an effective method for reducing pain and IADL difficulty in patients with chronic low back pain, and is considered as a independent nursing intervention for chronic low back pain.

• 기본간호학회지
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• 제26권2호
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• pp.75-85
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• 2019

Purpose: The purpose of this study was to examine effects of music intervention on environmental stress and sleep quality in liver transplant patients who are receiving care in one-person isolation rooms of an ICU. Methods: The study was a quasi-experimental design pre-and-post nonequivalent control group. Participants were 37 patients (18 in the experimental group and 19 in the control group) who, after receiving liver transplant, were hospitalized in one-person isolation rooms of the ICU. The study covered patients admitted between August 2016 and December 2017. Earplugs and sleep shades were provided as ordinary care to both experimental and control groups, and music intervention was provided to the experimental group three times a day for 30 minutes each from the first day of hospitalization. Results: The first hypothesis, "The experimental group who received music intervention will experience a lower environmental stress level than the control group" was supported (Z=-3.212, p<.001). The second hypothesis, "The experimental group who received music intervention will experience a higher sleep quality than the control group" was also supported (t=3.715, p=.001). Conclusion: Findings show that music intervention is an effective nursing intervention to reduce environmental stress and improve sleep quality in liver transplant patients in the ICU.