• 한국융합학회논문지
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• 제9권5호
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• pp.219-229
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• 2018

본 연구는 서울 경기에 거주하며 운동에 참여하는 65세 이상 274명을 대상으로 노인의 운동참여, 근육량, 근력과 인지기능의 정량적 지표를 토대로 이들 간의 관계성을 규명하고자 하였다. 자료수집은 연구대상자의 운동참여(참여 빈도, 참여 시간), 근육량, 근력(상지근력, 하지근력), 인지기능(한국판 간이정신상태검사, 숫자 바로 읽기, 숫자 거꾸로 읽기)을 측정하여 자료를 수집하였다. 일련의 타당성 있는 연구절차를 통하여 도출된 결론은 다음과 같다. 첫째, 노인의 운동참여, 근육량, 근력, 인지기능 간에는 통계적 유의한 상관관계가 나타났다. 둘째, 노인의 운동참여는 근육량, 근력, 인지기능에 정적(+) 영향력을 나타내었다. 셋째, 노인의 근육량은 근력, 인지기능에 통계적 유의한 정적(+) 영향력을 나타내었다. 넷째, 노인의 근력은 인지기능에 정적(+) 영향력을 나타내었다.

• 한국학교ㆍ지역보건교육학회지
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• 제21권3호
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• pp.1-19
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• 2020

Objectives: This study was attempted to examine the relationship between hand grip strength and dyslipidemia. and it was analyze the effect of hand grip strength on dyslipidemia and discuss the problems that may occur. Methods: The study focused on 'the National Health and Nutrition Survey's 7th Year 1, 2, and 3 (2016-2018)' as their primary data. Among people who measured dyslipidemia and relative hand grip strength, 12,636 people were selected as the final study after excluding missing values. Frequency analysis, mean analysis, and regression analysis was used to determine dyslipidemia and hand grip strength indices according to the subjects' characteristics study and verify the research hypothesis. Results: Outcomes show that 4,542 (35.9%) of the subjects were dyslipidemia, and when the hand grip strength of the subjects increased by 1kg, Dyslipidemia decreased by 0.217 less. The result of subdivided and analyzed dependent variables presented that every time the hand grip strength increased by 1kg, the L-HDL -C decreased by 0.325 less, but it did not affect H-LDL-C and H-TG. Conclusion: In order to reduce dyslipidemia, it is essential to recognize the necessity of muscular exercise and fulfill it. Focus on health care, such as health conditions, health behavior, and make efforts to participate in health education. If so, it is expected to help reduce the economic burden, such as the treatment of dyslipidemia and improve the quality of life free from mechanical circulatory diseases.

• 대한인간공학회지
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• 제28권3호
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• pp.41-47
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• 2009

The purpose of this study, during the lifting task was researching the difference and a relationship between the ground reaction force and the grip strength by change of position. After grip strength has measured in symmetry position and asymmetry position at 45cm and 75cm of height of hand, ground reaction force was measured by same attitude lifting wooden box. We analyzed the difference of grip strength and ground reaction force in each position change. The results of grip strength, the grip strength of both hand were significant difference that in study subject symmetry and asymmetry position (p<0.01). The results of symmetry lifting task, the study subjects was significant difference of the ground reaction force difference by height (p<0.05). Asymmetry lifting task was significant difference of ground reaction force difference by direction of rotation was changed (p<0.01). The result of it will rotate with non-dominant hand side of lifting tasks from height 75cm where it easily maintains a balance possibility and decreasing the load of the hand. Therefore, from the workshop in the work people, it will be between the height 75cm and non-dominant hand side of trunk rotatory direction in the lifting tasks. Future study is necessary researched about the change of grip strength when the height of the hand is higher, and the difference of the ground reaction force when the change of weight.

• Steel and Composite Structures
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• 제45권6호
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• pp.797-818
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• 2022

Steel-precast ultra-high-performance concrete (UHPC) composite beams with demountable high-strength friction-grip bolt (HSFGB) shear connectors can be used for accelerated bridge construction (ABC) and achieve excellent structural performance, which is expected to be dismantled and recycled at the end of the service life. However, no investigation focuses on the demountability and reusability of such composite beams, as well as the installation difficulties during construction. To address this issue, this study conducted twelve push-out tests to investigate the effects of assembly condition, bolt grade, bolt-hole clearance, infilling grout and pretension on the crack pattern, failure mode, load-slip/uplift relationship, and the structural performance in terms of ultimate shear strength, friction resistance, shear stiffness and slip capacity. The experimental results demonstrated that the presented composite beams exhibited favorable demountability and reusability, in which no significant reduction in strength (less than 3%) and stiffness (less than 5%), but a slight improvement in ductility was observed for the reassembled specimens. Employing oversized preformed holes could ease the fabrication and installation process, yet led to a considerable degradation in both strength and stiffness. With filling the oversized holes with grout, an effective enhancement of the strength and stiffness can be achieved, while causing a difficulty in the demounting of shear connectors. On the basis of the experimental results, more accurate formulations, which considered the effect of bolt-hole clearance, were proposed to predict the shear strength as well as the load-slip relationship of HSFGBs in steel-precast UHPC composite beams.

• Structural Engineering and Mechanics
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• 제44권5호
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• pp.649-661
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• 2012

An experimental research was conducted to investigate the strength of biaxially loaded short and slender reinforced concrete columns with high strength concrete. In the study, square and L-shaped section reinforced concrete columns were constructed and tested to obtain the load-deformation behaviour and strength of columns. The test results of column specimens were analysed with a theoretical method based on the fiber element technique. The theoretical ultimate strength capacities and the test results of column specimens have been compared and discussed in the paper. Besides this, observed failure mode and experimental and theoretical load-lateral deflection behaviour of the column specimens are presented.

• 한국건축시공학회지
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• 제7권4호
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• pp.145-151
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• 2007

In this paper, tests are carried out in order to investigate the strength development of concrete under various binder types, W/B and curing temperature ranged from $5{\sim}20^{\circ}C$. Fly ash and blast furnace slag were incorporated by as much as 30%, respectively. Strength development of concrete are estimated using Logistic model and strength ratio of concrete at 28days to that at early age are also investigated. According to experimental results, it is found that good agreements are obtained between measured values and calculated ones using logistic model below $20^{\circ}C$. Strength ratio of concrete at 28days to that at early age increases in case W/B decreases and curing temperature increases. Tables and graphs for strength ratio of concrete are provided in this paper. It is capable of obtaining and predicting the periods to attain design strength by considering increment factor of strength easily with the table and graphs presented in this paper. This paper presents the reference data to decide removal time of form, time to reach target strength and strength inspection of remicon whether the test specimens meet the specified criteria of compressive strength. Multi regression models with respect to the relationship between 7days compressive strength and 28 days compressive strength depending on W/B and admixture types are presented.

• 콘크리트학회논문집
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• 제13권6호
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• pp.610-618
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• 2001

본 논문에서는 동탄성계수와 정탄성계수 및 압축강도의 상관관계를 양생온도, 재령, 시멘트의 종류에 따라 살펴보고 그 거동을 정확하게 모델링하는 모델식을 제시하고자 하였다. 이를 위하여 충격공진법을 이용하여 공진주파수를 측정하여 동탄성계수를 계산하고 일축압축실험을 통하여 정탄성계수와 압축강도를 구하였다. 시멘트는 1종과 5종 포틀랜드 시멘트를, 물-시멘트비는 0.40과 0.50을, 양생온도는 10, 23, 5$0^{\circ}C$를 선택하여 실험을 수행하였다. 동탄성계수와 정탄성계수의 상관관계는 시멘트의 종류와 재령에 큰 영향을 받지 않았다. 그러나, 양생온도의 변화에 따라 동탄성계수와 정탄성계수의 상관관계는 변화하여 두 값의 비가 온도가 증가함에 따라 1에 가깝게 접근하였다. 초기현탄성계수와 동탄성계수의 비는 정탄성계수와 동탄성계수의 비보다 좀 더 1에 가까웠다. 압축강도와 동탄성계수의 상관관계는 동탄성계수와 정탄성계수의 상관관계와 같이 시멘트의 종류와 재령에는 큰 영향을 받지 않았지만 양생온도에 따라서는 그 상관관계가 변하였다. 제시된 동탄성계수와 정탄성계수 및 압축강도의 상관관계식들은 이러한 시멘트의 종류와 온도에 따른 상관관계의 변화를 잘 모델링하였다.

• 한국의류산업학회지
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• 제7권4호
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• pp.433-438
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• 2005

Seven commercial lining fabrics normally used in a market were selected: plain-weave fabrics with polyester, nylon, rayon and acetate fiber, and polyester textured yarn, in addition, polyester fabrics with plain, twill and satin weave. Then seam strength, seam efficiency, resistance to slippage of yarns and type of seam destruction were examined related to endurance by textiles in sewing capability of the lining fabrics. In results, as tensile strength was greater, seam strength got greater, which shows tensile strength and seam strength have close relationship. Tensile and seam strength of acetate fabric were the least, but seam efficiency was the greatest. It presents that strong tensile and seam strengths do not show high seam efficiency at the same time. Various types of seam destruction have been shown. When tensile strength of the sewing thread was greater than tensile strength of fabric, fabric destruction was occurred before the sewing thread destruction. When tensile strength of the fabric was greater than seam strength, the sewing thread destruction was occurred. Resistance to slippage of yarns got greater as tensile strength of the fabric got greater. The plain-weave fabric, which tensile strength of fabric was smaller, showed the greater resistance to slippage of yarns than twill and satin weave fabrics. The stretch fabric revealed the optimal lining fabric with the greatest resistance to slippage of yarns.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 1999년도 가을 학술발표회 논문집
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• pp.227-232
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• 1999

In this paper, a laboratory investigation was carried out to estimate the strength improvement of quicklime mixture for the effective use of surplus soils, and the shear strength with curing time was estimated at the content of lime. The effect of strength improvement has been established through the change of lime content with chlorides and sulfates from the samples taken at Samsan region, Ulsan. The test results indicated that the presence of calcium sulphate encouraged the efficiency of lime stabilization, and increased shear strength. Furthermore, it is necessary for inquiring into the relationship between the characteristics of strength and the chemical components.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2005년도 춘계 학술기술논문발표대회 논문집
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• pp.45-48
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• 2005

This study is basic experiment for estimating influence of strength by curing temperature of concrete's heat of hydration and estimate relationship of compressive strength development by initial curing temperature factor, and then asume temperature factor which influence compressive strength development and for showing basic document of qualify control. According to the result of cement mortar by the curing temperature factor high-curing temperature shows high strength on 3 day compare with low curing-temperature, shows higher strength than the piece of high curing temperature.