• 디지털융복합연구
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• 제14권11호
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• pp.27-35
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• 2016

본 연구는 노인의 자살생각 관련 위험요인을 파악할 목적으로 국민건강영양조사 제6기 1차년도(2013) 자료를 이용하여 2차 자료 분석을 하였다. 65세 이상 노인 1,201명의 자료를 SPSS 22.0 버전으로 카이제곱검정, t-검정, 다중 로지스틱 회귀분석을 실시한 결과 대상자의 7.7%가 자살생각을 한 적이 있었으며, 노인의 자살생각과 관련된 위험요인으로 우울과 스트레스 및 활동 제한이 확인되었다. 즉 우울감을 느끼는 경우 4.44배(CI=2.66~7.40), 스트레스를 많이 느끼는 경우 9.24배 (CI=3.48~24.45), 활동제한이 있을 때 2.31 배(CI=1.40~3.82) 자살생각이 높게 나타났다. 또한 노인의 교육수준, 독거, 배우자 유무, 경제활동 여부, 만성질환 수, 건강관련 삶의 질에 따라 자살생각이 차이가 있는 것으로 나타났다. 따라서 노인의 자살생각을 낮추고 자살을 예방하기 위해 위험요인의 완화를 중재할 수 있는 융복합적인 프로그램의 개발 및 적용 연구를 제언한다.

• 한국산학기술학회논문지
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• 제19권5호
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• pp.426-431
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• 2018

본 논문에서는 각국 화폐의 환율변동성이 우리나라 원화의 환율변동성에 미치는 전이효과를 분석하였다. 분석을 위하여 G7 국가로서의 선진국 화폐인 일본 엔화, 유로화, 영국 파운드화, 캐나다 달러화와 우리나라가 지리적으로 가까이 위치해 있는 아시아 오세아니아 지역의 화폐인 태국 바트화, 인도네시아 루피아화, 싱가포르 달러화, 호주 달러화가 사용되었다. 연구기간은 2009년 1월부터 2017년 12월까지이며 주별 자료를 사용하였고 분석방법으로는 GARCH(1,1) 모형이 사용되었다. 분석결과, 일본 엔화, 유로화, 영국 파운드화, 태국 바트화 및 인도네시아 루피아화의 환율변동성이 우리나라 원화 환율변동성에 미치는 영향은 유의하지 않았으며, 캐나다 달러화, 싱가포르 달러화와 호주 달러화의 환율변동성이 우리나라 원화환율변동성에 영향을 미치는 전이효과는 유의하였다. 본 연구를 위하여 선택된 국가들을 경제체제와 구조면에서 평가해 볼 때, 일본, 영국 및 유로화 사용 국가는 우리나라보다 높은 수준에 있고, 태국과 인도네시아는 우리나라보다 낮은 수준에 있으며, 캐나다, 싱가포르, 호주는 비슷한 수준에 있다고 말할 수 있다. 그러므로 본 논문의 연구에서 우리나라 화폐의 환율변동성에 영향을 미치는 화폐로서 캐나다달러화, 싱가포르 달러화, 호주 달러화가 채택된 분석결과는 경제체제나 구조가 유사한 국가들 간의 환율변동성 전이현상 때문에 나타난 결과라고 추정할 수 있으며, 지역적으로 근접한 나라들 사이에서 환율변동성 전이현상이 일어난다고 주장하는 선행연구들과는 배치된다고 말할 수 있다.

• Asian Pacific Journal of Cancer Prevention
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• 제15권22호
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• pp.9679-9685
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• 2014

Background: When evaluating health-economics for cervical cancer prevention policies in Japan, it is important to use Japanese value settings. This study aimed to obtain preference-based measures (preference measures) for hypothesized health states among healthy Japanese women, and to examine differences between the EuroQol-5D (EQ-5D) and standard gamble (SG) instruments. Materials and Methods: The investigation was performed among female students at a nursing university. We used written hypothetical scenarios describing three grades of cervical intraepithelial neoplasia (CIN) and eight stages of cervical cancer, both at diagnosis and after medical intervention. Preference measures were evaluated using both EQ-5D and SG. Results: We received responses from 136 women. The mean number of respondents per stage was 24.6 (SD: 2.7). At diagnosis, average EQ-5D scores for CIN1, CIN2, CIN3, IA1, IA2, IB1, IB2, IIA, IIB, III, and IV stages were 0.84 (0.14), 0.78 (0.12), 0.73 (0.10), 0.78 (0.12), 0.72 (0.12), 0.63 (0.13), 0.64 (0.12), 0.68 (0.08), 0.62 (0.13), 0.55 (0.21), and 0.18 (0.24), respectively. Using one-way analysis of variance with the Tukey-Kramer method for multiple comparisons (each stage vs. CIN1), we found significant differences for IB1 and more advanced stages (p<0.05). After medical intervention, corresponding EQ-5D scores were 0.84 (0.12), 0.81 (0.12), 0.84 (0.12), 0.80 (0.15), 0.78 (0.11), 0.64 (0.15), 0.63 (0.15), 0.71 (0.15), 0.50 (0.17), 0.52 (0.17), 0.21 (0.28). The multiple comparisons identified significant differences for IB1 and more advanced stages, excepting IIA (p<0.05). SG evaluations were more variable and relatively higher than EQ-5D evaluations. Conclusions: We obtained preference measures for three grades of CIN1-3 and eight stages of cervical cancer. In combination with appropriate sensitivity analyses, these preference measures will provide a basis for an economic evaluation of cervical cancer prevention in Japan. We suggest that EQ-5D is appropriate for cost-utility analysis of this topic.

• Journal of Korean Biological Nursing Science
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• 제11권2호
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• pp.136-142
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• 2009

Purpose: The purpose of this study was to identify the factors influencing health related to quality of life with hypertension patients. Methods: The subjects of this study were 409 hypertensive patients. Data were collected from March 1st to April 30th, 2008. A questionnaire consisting of exercise barrier, Psychosocial Wellbeing Index (PWI), EuroQol 5D (EQ-5D) was given. The collected data were analyzed with the SPSS program which was used for descriptive statistics, univariate and multivariate analysis. Results: There was a significant relationship between exercise barrier (t=3.57, p=.000), psychosocial wellbeing (F=29.96, p=.000) and health related to quality of life. According to the result of multiple regression, the identified significant factors were an exercise barrier (F=7.09, p=.000) and psychosocial wellbeing (F=21.5, p=.000) with health related to quality of life. Conclusion: Hypertension patients experienced exercise barrier and psychosocial distress which led to a negative effect on health related to quality of life. Therefore it is needed to encourage motivation of lasting of exercise compliance and relieving of psychosocial distress for better health promotion and high quality of life.

• 센서학회지
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• 제22권3호
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• pp.191-196
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• 2013

A particulate matter sensor fabricated by MEMS process is proposed. It is developed to accommodate Euro6 on-board diagnostics regulation for diesel automobile. In the regulation, emission of diesel particulate matter is restricted to 9 mg/km. Particulate matter sensor is designed to use induced charges by charged particulate matter. To increase sensitivity of the sensor, groove is formed on sensor surface because wider surface area generates more induced charges. Sensitivity of the sensor is measured 10.6 mV/(mg/km) and the sensor shows good linearity up to 15.7 mg/km. Also its minimum detectable range is about 0.25 mg/km. It is suitable to detect failure of a diesel particulate filter which should filter particulate matter more than 9 mg/km. For removing accumulated particulate matter on the sensor which can disturb normal operation, platinum heater is designed on the backside of the sensor. The developed sensor can sense very low amount of particulate matter from exhaust gas in real-time with good linearity.

• 항공우주산업기술동향
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• 제7권2호
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• pp.40-47
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• 2009

본 논문에서는 위성 소프트웨어 검증을 위해 현재 세계적으로 개발되고 있는 위성 시뮬레이터의 개발 동향에 대해서 기술한다. 현재 위성 및 임무의 복잡성은 계속적으로 증가되고 있는 추세에 있어 위성 시뮬레이터의 사용 은 당연한 선택으로 받아들여지고 있다. 위성 시뮬레이터의 이용으로 인해 위성 개발 비용의 감소 및 시험 기간의 단축의 효과를 얻을 수 있으며, 이전에 사용된 개발 자산을 다음 개발에 효과적으로 재사용하는 것이 가능함에 따라 위성 개발 주기를 효과적으로 단축시킬 수 있게 되었다.

• 한국보건간호학회지
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• 제24권1호
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• pp.49-60
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• 2010

Purpose: This study investigated the quality of life, mental health and subjective health status of community dwelling cancer patients. Methods: Subjects were 212 out-patients with cancer at Kangwon University Hospital. The study was conducted from July 10 to August 14, 2008. Quality of life as determined by the Euro Quality of life-5 Dimensions (EQ-5D) was measured using Korea Centers for Disease Control and Prevention(KCDC). Mental health and subjective health status were measured using KCDC. Results: EQ-5D determined degrees of difficulty were 25.5%(mobility), 25.2%(anxiety or depression), 23.6%(pain or discomfort), 20.3%(activities of daily living), and 13.7%(self care). An analysis of the association between several factors and mental health showed that the statistically significant factors were age, gender, medical coverage, and private insurance. An analysis of the association between several factors and subjective health status showed that the statistically significant factor was occupation. Conclusion: Cancer patients suffer from significant psychological distress. Programs that address mental and physical health would be beneficial.

• 한국분무공학회지
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• 제22권1호
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• pp.1-7
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• 2017

Recently, Performance and fuel efficiency of gasoline engines have been improved by adopting direct injection (DI) system instead of port fuel injection (PFI) system. However, injecting gasoline fuel directly into the cylinder significantly reduces the time available for mixing and evaporation. Consequently, particulate matters(PM) emissions increase. Moreover, as the emission regulations are getting more stringent, not only the mass but also the total number of PM should be reduced to satisfy the Euro VI regulations. Increasing the fuel injection pressure is one of the methods to meet this challenge. In this study, the effects of increased fuel injection pressures on combustion and emission characteristics were experimentally examined at several part load conditions in a 1.6 liter commercial gasoline direct injection engine. The main combustion durations decreased about $2{\sim}3^{\circ}$ in crank angle base by increasing the fuel injection pressure due to enhanced air-fuel mixing characteristics. The exhaust emissions and number concentration distributions of PM with particle sizes were also compared. Due to enhanced combustion characteristics, THC emissions decreased, whereas NOx emissions increased. Also, the number concentrations of PM, larger than 10 nm, also significantly decreased.

• 자동차안전학회지
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• 제11권1호
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• pp.7-16
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• 2019

There are trying to reduce damage from automobile accident in many countries. In many automobile companies, there have been active study on development of ADAS (Advanced Driver Assistance Systems) for commercialization, in order to reduce damage from automobile accident. ADAS is the system providing convenience and safeness for drivers. Generally, ADAS is composed of ACC (Adaptive Cruise Control), LKAS (Lane Keeping Assist System), and AEB (Autonomous Emergency Braking). AEB of the ADAS, it is an autonomous emergency braking system and it senses potential collide and avoids or degrades it. Therefore AEB plays a significant role in reducing automobile accident rate. However, AEB safety evaluation method is not established not yet. For this reason, this study suggests safety evaluation scenarios with adding cut-in, sensor malfunctioning scenario that scenario domestic street conditions considered as well as original standard AEB scenario of Euro NCAP for establishment of safety evaluation method of AEB. And verifying validity of suggested scenario by comparing the calculated values of the theoretical formulas presented in the previous study with results of the actual vehicle test.

• 한국분무공학회지
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• 제28권3호
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• pp.150-155
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• 2023

Cold-start emissions are given great importance under the Euro-7 emission standard due to their significant impact on overall vehicle emissions. When an engine is started from a cold state, the combustion process is not yet optimized, leading to higher emissions. Hybrid vehicles, in particular, may face additional challenges, as their engine may remain inactive for extended periods, causing their catalysts to cool down and potentially become less effective in reducing emissions. In the present study, the performance of an electric heater was investigated as a means to enhance the catalyst heating during the start-up time. A simulation tool was utilized to develop a model for the gasoline exhaust aftertreatment system. The result indicates that the heater was able to increase the three-way catalyst temperature to 500℃ in 4 s using 20 kW power. In addition, the implementation of a secondary air supply resulted in reduced temperature overshoot and improved conversion efficiencies.