• 여성건강간호학회지
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• 제16권2호
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• pp.147-156
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• 2010

Purpose: This study was to examine the relationship of knowledge, health beliefs, and prevention behaviors of osteoporotic fracture in outpatients with osteoporosis. Methods: The subjects were 120 outpatients receiving osteoporosis treatment on K hospital in G city from Dec. 2007 to Feb. 2008. Questionnaires were collected and analyzed using the SPSS/WIN 12.0 program for descriptive statistics, and t-test, ANOVA, and Pearson correlation coefficient. Results: Subjects were treated for fracture about 28 months. The mean score of knowledge, health belief and prevention behaviors in subjects were $17.5{\pm}3.22$, $2.8{\pm}0.23$ and $2.8{\pm}0.38$ respectively. The score of health belief recorded the lowest point. However, the score of knowledge varied with general and disease-related characteristics of subjects. In contrast, the score of prevention behaviors did not showed any significant differences. Fracture prevention behavior in subjects showed rather higher relationship with the health belief system than the knowledge of fracture prevention. Conclusion: The present work suggested that education program for prevention behaviors of fracture should be developed to focus on altering the health belief system rather than the knowledge of osteoporotic fracture prevention. Furthermore, individual education program based on living circumstances and daily life habits should be also developed.

• 근관절건강학회지
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• 제22권2호
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• pp.130-137
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• 2015

Purpose: This study aims to establish a theoretical framework for the fall prevention behavior improvement program by verifying the associations between fracture risk, fall risk perception, and fall prevention behaviors in women with osteoporosis. Methods: A survey was conducted in 122 women who were diagnosed as osteoporosis by having T-score of the femur bone density below -2.5 standard deviation from the bone density examination performed in 2 orthopedic clinics located in B metropolitan city between July 2014 and September 2014. The risk of fracture, level of fall risk perception, and fall prevention behaviors were measured. Results: Fall risk perception had a complete mediating effect on the relationship between the fracture risk and fall prevention behaviors in women with osteoporosis. Conclusion: The perception of fall risk is important to enhance fall prevention behaviors in women with osteoporosis, and the development of various education programs to improve awareness of fall risk is needed.

• 대한간호학회지
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• 제44권5호
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• pp.525-533
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• 2014

Purpose: This study was done to propose and test a predictive model that would explain and predict fall prevention behaviors in postmenopausal women. The health belief model was the theoretical basis to aid development of a nursing intervention fall prevention program. Methods: Data for 421 postmenopausal women were selected from an original data set using a survey design. The structural equation model was tested for 3 constructs: modifying factors, expectation factors, and threat factors. Expectation factors were measured as relative perceived benefit (perceived benefit minus perceived barrier), self-efficacy, and health motivation; threat factors, as perceived susceptibility (fear of falling) and perceived severity (avoiding activity for fear of falling); and modifying factors: level of education and knowledge about fall prevention. Data were analyzed using SPSS Windows and AMOS program. Results: Mean age was 55.7 years (range 45-64), and 19.7% had experienced a fall within the past year. Fall prevention behaviors were explained by expectation and threat factors indicating significant direct effects. Mediating effect of health beliefs was significant in the relationship between modifying factors and fall prevention behaviors. The proposed model explained 33% of the variance. Conclusion: Results indicate that fall prevention education should include knowledge, expectation, and threat factors based on health belief model.

• Geomechanics and Engineering
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• 제24권6호
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• pp.573-588
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• 2021

The interaction of cracks and water significantly affects the fracture mechanism of rocks. In this study, laboratory tests were conducted using sandstone samples containing a single fissure to explore the hydro-mechanical behaviors in the failure process of pre-cracked rocks. The internal crack characteristics were also analyzed using X-ray CT scanning. The results show that the confining pressure has the greatest effect on the mechanical properties (e.g., strengths, elastic modulus, and Poisson's ratio), followed by the fissure inclination and water pressure. At a lower fissure inclination, the confining pressure may control the type main cracks that form, and an increase in the water pressure increases the number of anti-wing cracks and the length of wing cracks and branch cracks. However, the fracture behaviors of samples with a higher fissure inclination are only slightly affected by the confining pressures and water pressures. The effect of fissure inclination on the internal crack area is reduced with the propagation from the fissure tips to the sample ends. The fissure inclination mainly affects the value of permeability but not affect the trend. The impact of pre-existing fissure on permeability is smaller than that of confining pressure and water pressure.

• 한국응용과학기술학회지
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• 제40권3호
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• pp.392-401
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• 2023

본 연구는 저소득층 중년 여성의 골다공증 지식, 골다공증 예방행위의 상관관계 및 골다공증 예방행위에 영향을 미치는 요인을 확인하기 위한 서술적 조사연구이다. 연구대상자는 P시에 소재한 3개 종합병원에 내원한 저소득층 중년 여성 317명이며, 구조화된 설문지를 이용하여 2021년 2월 1일부터 2022년 12월 30일까지 자료를 수집하였다. 수집된 자료는 SPSS/WIN 27.0 프로그램을 이용하여 기술 통계, t-test, ANOVA, Pearson's correlation, Stepwise multiple linear regression으로 분석하였다. 연구 결과, 연구대상자의 골다공증 지식은 11.97±6.89점으로 낮게 나타났고, 골다공증 예방 교육 및 골절 경험에서 차이를 보였다. 골다공증 예방행위는 41.03±7.63점으로 낮았고, 종교, 동반질환, 골다공증 예방 교육 및 골절 경험, 주관적 건강상태에 따라 차이를 보였다. 골다공증 지식과 골다공증 예방행위는 통계적으로 유의한 양의 상관관계를 보였고(r=.527, p<.001), 골다공증 예방행위에 영향을 미치는 요인은 골절 경험(𝛽=.415, p<.001), 골다공증 예방 교육(𝛽=.359, p<.001), 주관적 건강상태(𝛽=.186, p<.001) 순으로 나타났다. 따라서 본 연구 결과를 토대로 저소득층 중년 여성의 골다공증 예방행위를 증진시킬 수 있는 프로그램을 개발하고, 참여를 권장할 수 있는 방안을 마련하는 등의 지속적인 관리가 이루어져야 할 것이다.

• Water Engineering Research
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• 제2권2호
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• pp.123-138
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• 2001

An injection experiment was carried ut to investigate the pressure domain within which hydromechanical coupling influences considerably the hydrologic behavior of a granite rock mass. The resulting database is used for testing a numerical model dedicated to the analysis of such hydromechanical interactions. These measurements were performed in an open hole section, isolated from shallower zones by a packer set at a depth of 275 m and extending down to 840 m. They consisted in a series of flow meter injection tests, at increasing injection rates. Field results showed that conductive fractures from a dynamic and interdependent network, that individual fracture zones could not be adequately modeled as independent systems, that new fluid intakes zones appeared when pore pressure exceeded the minimum principal stress magnitude in that well, and that pore pressures much larger than this minimum stress could be further supported by the circulated fractures. These characteristics give rise to the question of the influence of the morphology of the natural fracture network in a rock mass under anisotropic stress conditions on the effects of hydromechanical couplings.

• Geomechanics and Engineering
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• 제20권6호
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• pp.547-556
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• 2020

An understanding of the influence of MR (Magmatic Rock) thickness on the surrounding rock behaviors is essential for the prevention and management of dynamic disasters in coal mining. In this study, we used FLC3D to study the breaking and instability laws of surrounding rock with different MR thicknesses in terms of strata movement, stress and energy. The mechanism of dynamic disasters was revealed. The results show that the thicker the MR is, (1) the smaller the subsidence of the overlying strata is, but the subsidence span of the overlying strata become wider, and the corresponding displacement deformation value of the basin edge become smaller. (2) the slower the growth rate of abutment pressure in front of the working face is, but the peak value is smaller, and the influence range is larger. The peak value decreases rapidly after the breaking, and the stress concentration coefficient is maintained at about 1.31. (3) the slower the peak energy in front of coal wall, but the range of energy concentration increases (isoline "O" type energy circle). Finally, a case study was conducted to verify the disaster-causing mechanism. We anticipate that the research findings presented herein can assist in the control of dynamic hazards.

• Geomechanics and Engineering
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• 제29권5호
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• pp.567-582
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• 2022

In the present study, a series of physical experiments and numerical simulations were conducted to investigate the effects of mode I and mixed-mode I/II cracks on the fracture modes and stability of roadway tunnel models. The experiments and simulations incorporated different inclination angle flaws under both static and dynamic loads. The quasi-static and dynamic testing were conducted by using an electro-hydraulic servo control device and drop weight impact system (DWIS), and the failure process was simulated by using rock failure process analysis (RFPA) and AUTODYN software. The stress intensity factor was also calculated to evaluate the stability of the flawed roadway tunnel models by using ABAQUS software. According to comparisons between the test and numerical results, it is observed that for flawed roadways with a single radical crack and inclination angle of 45°, the static and dynamic stability are the lowest relative to other angles of fractured rock masses. For mixed-mode I/II cracks in flawed roadway tunnel models under dynamic loading, a wing crack is produced and the pre-existing cracks increase the stress concentration factor in the right part of the specimen, but this factor will not be larger than the maximum principal stress region in the roadway tunnel models. Additionally, damage to the sidewalls will be involved in the flawed roadway tunnel models under static loads.

• Structural Engineering and Mechanics
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• 제58권3호
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• pp.577-596
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• 2016

FRP-concrete interfacial mechanical properties determine the strengthening effect of RC beams strengthened with FRP. In this paper, the model experiments were carried out with eight specimens to study the failure modes and the strengthening effect of RC beams strengthened with FRP. Then a theoretical model based on interfacial performances was proposed and interfacial mechanical behaviors were studied. Finite element analysis confirmed the theoretical results. The results showed that RC beams strengthened with FRP had three loading stages and that the FRP strengthening effects were mainly exerted in the Stage III after the yielding of steel bars, including the improvement of the bearing capacity, the decreased ultimate deformation due to the sudden failure of FRP and the improvement of stiffness in this stage. The mechanical formulae of the interfacial shear stress and FRP stress were established and the key influence factors included FRP length, interfacial bond-slip parameter, FRP thickness, etc. According to the theoretical analysis and experimental data, the calculation methods of interfacial shear stress at FRP end and FRP strain at midspan were proposed. When FRP bonding length was shorter, interfacial shear stress at FRP end was larger that led to concrete cover peeling failure. When FRP was longer, FRP reached the ultimate strain and the fracture failure of FRP occurred. The theoretical results were well consistent with the experimental data.