장기요양기관 노인의 일상스트레스, 자아탄력성이 삶의 질에 미치는 영향

이강일,이종훈 한국융합학회 2017 한국융합학회논문지 Vol.8 No.6

이 연구는 장기요양기관 노인의 일상스트레스, 자아탄력성, 삶의 질 변인 간 인과관계 모델을 설정하고 경로분석을 실시하였다. 수도권에 소재한 민간 노인장기요양기관의 이용자를 대상으로 최종 380명을 SPSS 22.0과 AMOS 22.0을 이용하여 일상스트레스, 자아탄력성, 삶의 질 변인 간 관계를 분석하였다. 연구결과, 첫째, 노인의 일상스트레스는 삶의 질에 부(-)적인 직접 효과가 있는 것으로 나타났다. 둘째, 노인의 자아탄력성은 삶의 질에 정(+)적인 직접 효과가 있었다. 셋째, 노인의 일상스트레스는 자아탄력성에 정(+)적인 직접 효과가 나타났다. 넷째, 노인의 자아탄력성을 매개로 일상스트레스는 삶의 질에 간접 효과 및 부분 매개 효과가 있는 것으로 나타났다. 따라서, 노인의 삶의 질을 향상하기 위해서는 일상스트레스를 감소하고 자아탄력성을 높이기 위한 프로그램 개발 및 제도적 지원 방안이 필요하다. In this study to identify a causal relationship between daily stress, ego-resilience and the quality of life of the elderly in long-term care facility, a causal relationship model was set up and path analysis was performed. The data collected from 380 elderly users in private long-term care facilities in Greater Seoul Metropolitan area were analyzed using SPSS 22.0 and AMOS 22.0 to analyze the correlation between daily stress, ego-resilience, and the quality of life of the elderly. The results of this study are as follows; First, daily stress of the elderly showed a negative (-) direct effect on the quality of life. Second, the ego-resilience of the elderly had a positive (+) direct effect on the quality of life. Third, daily stress of the elderly showed a positive (+) direct effect on ego-resilience. Fourth, daily stress of the elderly showed indirect effect and partial mediating effect on the quality of life through ego-resilience. Therefore, in order to improve the quality of life of the elderly, it is necessary to develop programs and institutional support to reduce daily stress and increase ego-resilience.

사면 및 옹벽에서의 교육용 원심모형 실험장치 활용사례

이강일,김태형,이준용,Lee, Gang-Il,Kim, Tae-Hyeong,Lee, Jun-Yong 한국지반공학회 2008 지반 : 한국지반공학회지 Vol.24 No.11

날씨파생상품 가격 데이터를 활용한 기후변화 영향평가

이강일,한택환 한국경영학회 2009 한국경영학회 통합학술발표논문집 Vol.2009 No.08

Ultrasonic Technique for Measuring the Thickness of Scale on the Inner Surfaces of Pipes

이강일 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.2

At the present time, there are no known commercialized nondestructive techniques for measuring or detecting the scale on the inner surfaces of pipes in situ. The present study aims to develop an ultrasonic technique for measuring the thickness of scale on the inner surfaces of pipes in situ. All experiments were carried out under laboratory conditions by using three pipe samples with scale (HNO3). The pipe samples were made of polypropylene (PP), polyvinyl chloride (PVC), and steel,respectively. The ultrasonic technique developed in the present study was successfully applied to determine the scale thicknesses of the PP and the PVC pipes whereas it was not applicable to the steel pipe. It is expected that a predetermined graph for a particular type of scale, relating the scale thickness to the time of flight of a pulse within the scale, can be used in further testing, thereby eliminating the need for future destructive inspections.

Dependencies of Acoustic Properties on the Frequency, Porosity, and Grain Size in Water-Saturated Sandy Sediment from 150 to 350 kHz: Application of the Grain-Shearing Model

이강일 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.56 No.1

In the present study, the grain-shearing (GS) model for wave propagation in a saturated, unconsolidated,granular material was applied to predict the dependencies of the acoustic properties, such as the phase velocity and the attenuation, of the compressional wave on the frequency, porosity,and grain size in water-saturated sandy sediment over the frequency range from 150 to 350 kHz. The GS model predicted a slightly positive velocity dispersion and a near-linear relationship of the attenuation with the frequency, following well the trends of the data acquired from water-saturated sandy sediment with a porosity of 0.408 and a mean grain diameter of 425 µm. The predictions for the relationships of the acoustic properties with the porosity and the grain size also showed good agreement with the measurements. These results suggest that the GS model may be usefully employed as a practical tool for estimating the acoustic and the physical properties of a sediment.

Frequency Dependencies of Acoustic Properties in Water-Saturated Sandy Sediment from 0.5 to 1.0 MHz: Application of the Modified Biot-Attenborough Model

이강일 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.55 No.6

In the present study, the modified Biot-Attenborough (MBA) model for acoustic wave propagation in fluid-saturated porous media was applied to predict the frequency dependencies of the phase velocity and the attenuation coefficient for the fast wave in water-saturated sandy sediment. Measurements of the phase velocity and the attenuation coefficient were performed over a frequency range from 0.5 to 1.0 MHz for water-saturated sandy sediment with a mean grain diameter of 400 μm and a porosity of 40 %. The experimental results revealed that the phase velocity exhibited a slightly negative dispersion linearly with the frequency and that the attenuation coefficient increased almost linearly with the frequency. The measurements were in good agreement with the model predictions over the frequency range covered here. Further studies will be required in frequency ranges not covered by existing data in order to establish completely the adequacy of the MBA model. In the present study, the modified Biot-Attenborough (MBA) model for acoustic wave propagation in fluid-saturated porous media was applied to predict the frequency dependencies of the phase velocity and the attenuation coefficient for the fast wave in water-saturated sandy sediment. Measurements of the phase velocity and the attenuation coefficient were performed over a frequency range from 0.5 to 1.0 MHz for water-saturated sandy sediment with a mean grain diameter of 400 μm and a porosity of 40 %. The experimental results revealed that the phase velocity exhibited a slightly negative dispersion linearly with the frequency and that the attenuation coefficient increased almost linearly with the frequency. The measurements were in good agreement with the model predictions over the frequency range covered here. Further studies will be required in frequency ranges not covered by existing data in order to establish completely the adequacy of the MBA model.

Relationships of Bone Density with Quantitative Ultrasound Parameter in Bovine Cancellous Bone

이강일 한국물리학회 2009 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.54 No.1

The present study aims to investigate the relationships of bone density with quantitative ultrasound (QUS) parameters measured in transmission and backscatter modes in bovine cancellous bone. The speed of sound (SOS), the normalized broadband ultrasound attenuation (nBUA), the broadband ultrasound backscatter (BUB) and the integrated reflection coefficient (IRe) were measured for 35 specimens obtained from proximal ends of seven bovine tibiae. The highest correlation coefficient was observed for SOS (r = 0.75, p < 0.001). Similarly, nBUA was significantly correlated with density (r = 0.71, p < 0.001). In contrast, BUB and IRe were less correlated with density than transmission QUS parameters, but still significantly (r = 0.63 and 0.65, respectively, all p < 0.01). A multiple regression analysis was used to find optimal models for the prediction of apparent bone density by using linear combinations of SOS, nBUA, BUB and IRe, with density as an independent variable and 2,3 and 4 QUS parameters as dependent variables (r = 0.77 - 0.88, all p < 0.001). The results suggest that the analysis of multiple QUS parameters can contribute to improving the efficacy of QUS procedures in the diagnosis of osteoporosis beyond the established value of SOS and nBUA.

Dependences of the Backscatter Coefficient on the Frequency, the Bone Volume Fraction, and the Trabecular Thickness in Bovine Femoral Trabecular Bone In V itro

이강일 한국물리학회 2013 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.63 No.5

The present study aims to provide insight into the dependences of the backscatter coefficient onthe frequency, the bone volume fraction (BV/TV), and the trabecular thickness (Tb.Th) in bovinefemoral trabecular bone in vitro. The frequency-dependent backscatter coefficient was measuredin 20 bovine femoral trabecular bone samples over a frequency range from 0.2 to 0.7 MHz. Thebackscatter coefficient measured at 0.5 MHz exhibited significant positive correlations with theBV/TV (r = 0.76) and the Tb.Th (r = 0.77). The power-law fits to the measurements showedthat the backscatter coefficient was empirically proportional to the frequency, the BV/TV, and theTb.Th with exponents of n = 2.9, 1.3, and 1.8, respectively. The present study also used a scatteringmodel, in which the scattering coefficient was proportional to the product of the mean velocityfluctuation and the correlation function integrated over the volume, to predict the measurements. The measurements were found to largely fall within the range of the predictions obtained from thescattering model.

약한 외부자기장이 인가된 유도결합형 플라즈마에서 m=0와 m=1 wave mode를 갖는 plasma wave의 특성 연구

이강일,김상진,노태협,김곤호 한국진공학회 2001 한국진공학회 학술발표회초록집 Vol.- No.-

전자빔 증착법으로 성장한 NiO 박막의 전기적, 전자구조 및 광학적 특성

이강일,유스라마덴니,강희재,박남석 한국물리학회 2014 새물리 Vol.64 No.5

NiO thin films having 50 nm thickness were grown by using e-beam evaporation at room temperature, after which in-situ post-annealing was carried out at temperatures of 100℃, 200℃ and 300℃ for 30 minutes. The electrical, electronic structure and optical properties of the NiO thin films were obtained via Hall measurements, X-ray photoelectron spectroscopy (XPS), reflection electron energy loss spectroscopy (REELS), and UV spectrometer. The electrical properties of the NiO thin films grown at room temperature and post-annealed at 100℃ showed p-type semiconducting properties, and the average transmittance in the visible region was more than 70%. These results showed that NiO thin films should have applications as p-type transparent thin-film semiconductors. To the contrary, NiO thin films post-annealed at temperatures over 200℃ showed n-type semiconductor properties, and the average transmittance in the visible region was drastically decreased due to the formation of Ni-metal bonding. 전자빔증착법 (electron-beam evaporation)을 이용하여 유리 기판에 50 nm의 NiO 박막을 성장시킨 후 진공용기 내에서 100℃, 200℃, 300℃ 온도로 후 열처리를 하였으며, 박막의 전기적, 전자구조 및 광학적 특성을 홀 측정, 광전자 분광법, 반사 전자 에너지 손실 분광법 및 UV-spectrometer 실험 통하여 연구를 하였다. 실온 및 100℃로 후 열처리를 한 박막의 경우 p형 반도체 특성의 전기적 특성을 나타내었으며, 투과도 또한 가시광 영역에서 70%이상의 투과율을 나타내었으며, 이는 p형 투명전자소자로의 응용이 가능하다는 것을 보여주었다. 반면 200℃, 300℃ 온도로 후 열처리 한 박막의 경우, 표면에 Ni 금속 결합의 생성으로 n형 반도체 특성으로 변화하였으며, 투과율 또한 급격히 감소하는 것으로 나타내었다.