• 한국지반공학회논문집
• /
• 제23권9호
• /
• pp.39-49
• /
• 2007

본 연구에서는 수치해석을 통해 말뚝캡의 강성에 따른 거동차이를 분석하였다. 따라서 강성캡과 연성캡을 선정하여 상부교각과 하부군말뚝기초를 일체화하여 일련의 해석을 수행하였다. 해석 시 캡강성에 영향을 주는 캡의 탄성계수와 두께, 상부 교각길이, 지반반력, 그리고 말뚝직경 등을 고려하였다. 본 연구결과 군말뚝내 개별말뚝에 작용하는 하중은 말뚝캡의 강성에 크게 좌우되었으며 그 결과, 연성캡 해석결과는 강성캡에 비하여 수평하중과 휨모멘트가 상대적으로 크게 발생하므로 좀 더 보수적인 설계가 가능하리라 판단된다.

• 한국운동역학회지
• /
• 제22권1호
• /
• pp.105-111
• /
• 2012

The purpose of this study was to investigate the effect that difference in forefoot of shoe flexibility during the quick lunge from a jump smashing on the lower limbs and the plantar pressure distribution. For this 10 elite badminton players with over 10 years experience and right handed participated. Two kinds of badminton shoes were selected and tested mechanical testing for the forefoot flexibility. Motion analysis, ground reaction forces and plantar pressure distribution were recorded. It was required to conduct lunge movement after jumping smashing as possible as high. Photo sensor was located in 3 meter away from standing position and its height was 40 cm. Subjects were conducted to return original position after touching the sensor as under clear movement as possible as fast. Forefoot stiffness had an effect on shoe peak bending degree and peak bending angular velocity in propulsion phase. Forefoot flexibility had an effect on ankle plantar flexion and knee flexion moment. It appears that joint power on lower limb and peak plantar pressure were not influenced by the flexibility of shoes.

• 대한통합의학회지
• /
• 제1권2호
• /
• pp.1-12
• /
• 2013

Purpose : The purpose of this study was to evaluate the effect of 6 weeks of sling exercises on female patients 20 years of age with low back pain according to flexibility, balance, muscle strength and pelvic tilt. Method : The 20 female patients who complained of back pain were divided into two groups. The experimental group exercised for 40 minutes, 3 times a week for 6 weeks. The control group did not. Both groups were measure for flexibility, balance, muscular strength, and pelvic tilt angle. Result : Curvature of the experimental flexibility, stretch, balance, muscle strength of the trunk forward, backward, left rotation, right rotation for the sling exercise group had significant differences. However, pelvic tilt did not show a significant difference. Control of the stretch of the flexibility, balance, and muscle strength of the trunk posterior showed significant differences for the sling exercise group. Conclusion : Although significant differences were found in flexibility, balance, muscular strength, there was no difference in pelvic tilt. When selecting subjects, we believe patients with regular patterns of pain will be more effective for statistical analysis of the changes in pelvic tilt.

• 융합정보논문지
• /
• 제11권12호
• /
• pp.201-210
• /
• 2021

본 연구목적은 대학 행정직원들의 지각된 스트레스와 우울간의 관계에서 심리적 유연성의 조절효과를 검증하는 것이다. 대상자 186명에게 설문지를 시행했다. 자료는 SPSS 25.0 프로그램을 활용하여 통계 분석했다. 분석결과, 지각된 스트레스, 긍정적 지각, 심리적 유연성이 우울에 영향을 미치는 반면, 부정적 지각은 우울에 영향을 미치지 않았다. 지각된 스트레스와 우울 간의 관계에서 심리적 유연성의 조절효과가 검증되었다. 이러한 결과를 바탕으로 대학 행정직원의 스트레스가 통제 상실과 같은 부정적 지각보다는 긍정적 기능 감소와 같은 긍정적 지각과 더 밀접한 관계를 가진 것으로 논의했다. 또한, 심리적 유연성이 스트레스가 우울에 미치는 영향력을 감소시키고 우울을 예방할 수 있음을 논의했다. 대학 행정직원들의 스트레스와 우울 문제에 대한 개입 방안으로서 심리적 유연성을 향상시키는 수용전념치료를 제안했다.

• Structural Engineering and Mechanics
• /
• 제71권4호
• /
• pp.391-405
• /
• 2019

Compared to the ambient vibration test mainly identifying the structural modal parameters, such as frequency, damping and mode shapes, the impact testing, which benefits from measuring both impacting forces and structural responses, has the merit to identify not only the structural modal parameters but also more detailed structural parameters, in particular flexibility. However, in traditional impact tests, an impacting hammer or artificial excitation device is employed, which restricts the efficiency of tests on various bridge structures. To resolve this problem, we propose a new method whereby a moving vehicle is taken as a continuous exciter and develop a corresponding flexibility identification theory, in which the continuous wheel forces induced by the moving vehicle is considered as structural input and the acceleration response of the bridge as the output, thus a structural flexibility matrix can be identified and then structural deflections of the bridge under arbitrary static loads can be predicted. The proposed method is more convenient, time-saving and cost-effective compared with traditional impact tests. However, because the proposed test produces a spatially continuous force while classical impact forces are spatially discrete, a new flexibility identification theory is required, and a novel structural identification method involving with equivalent load distribution, the enhanced Frequency Response Function (eFRFs) construction and modal scaling factor identification is proposed to make use of the continuous excitation force to identify the basic modal parameters as well as the structural flexibility. Laboratory and numerical examples are given, which validate the effectiveness of the proposed method. Furthermore, parametric analysis including road roughness, vehicle speed, vehicle weight, vehicle's stiffness and damping are conducted and the results obtained demonstrate that the developed method has strong robustness except that the relative error increases with the increase of measurement noise.

• 신재생에너지
• /
• 제8권2호
• /
• pp.33-43
• /
• 2012

Why solar companies preferred vertical integration of whole value chain? Major solar companies have built internally strong vertical integration of entire PV value chain. We raise a question whether such integration increases the corporate value and whether market situation affects the result. To test these questions, we conducted multi-variant analysis where characteristic factors mainly affect the corporate value measured in terms of Tobin'Q, based on the financial and non-financial data of PV companies listed in US stock market between 2005 and 2010. We hypothesize that since integration increases the overall efficiency but decreases the flexibility to adjust to various market situation, the combined effect of the efficiency gain and the flexibility loss ultimately determines the sign of integration effect on the corporate vale. We infer that the combined effect will be influenced heavily by business cycle, as in boom market (Seller's market) the efficiency gain may be larger than the flexibility loss and vice versa in bust market. We test whether the sign of combined effect changes after the year of 2009 and which factors influence most the sign. Year of 2009 is known as the year when market shifted from Seller's to Buyer's market. We show that 1) integration increases corporate value in general but after 2009 integration significantly decreases the value, 2) the ratios such as Production/Total Cost, Cash turnover period chosen for reversal of the flexibility measure are negatively affect Tobin's Q and especially stronger after 2009. This shows the flexibility improves corporate value and stronger in the recess period (Buyer's market). These results imply that solar company should set up integration strategy considering the tradeoff between efficiency and flexibility and the impact of the business cycle on both factors. Strategy only based on the price competitiveness determined in boom time can bring undesirable outcomes to the company. In addition, Strategic alliances in some value chains as a flexible bondage should be taken in account as complementary choice to the rigid integration.

• 항공우주시스템공학회지
• /
• 제16권4호
• /
• pp.68-76
• /
• 2022

본 논문에서는 기하학적 특성을 고려한 케이블 네트 형상설계 방법론을 제시하고, 트러스 링 그리고 케이블 네트의 구조 유연도를 고려한 반사판 안테나의 케이블 네트워크 형상 실효성을 검증한다. 기하학적 비선형성을 고려한 케이블 네트의 유한요소 모델을 개발한다. 경계조건의 하중에 따른 형상변형 해석을 통하여, 케이블 네트의 형상 설계변수 특성을 제시 한다. 프레임 요소를 이용하여 전개형 트러스 링 구조를 모델링하고 정적 하중 해석을 수행한다. 전개된 링 구조에 가해지는 장력에 의해 케이블 네트 반사판은 정확한 형상을 유지하게 된다. 가해지는 장력, 케이블 네트 그리고 트러스 링 구조의 유연도를 고려하여, 케이블 네트워크 형상설계에 반영하고 최종 형상을 제시한다.

• 한국노년학
• /
• 제40권1호
• /
• pp.73-89
• /
• 2020

본 연구는 정순둘 등(2015)이 개발한 연령통합척도를 Riley 등(1994)이 개념구성한 연령유연성과 연령다양성을 하위요인으로 한 단축형 연령통합척도로 척도의 타당성을 검증하여 척도의 실용성을 확보하고, 인구사회학적 특징에 따른 연령통합인식을 파악하는 것을 목적으로 하였다. 이를 위해 한국연구재단에서 지원한 사회과학역량강화지원사업(SSK)의 지원을 받아 수행된 '연령통합 및 세대통합 조사'자료의 총 1433명을 대상으로 분석하였다. 분석방법은 탐색적 요인분석, 확인적 요인분석, 다집단 요인분석, 평균비교 등의 방법을 활용하였다. 분석결과는 다음과 같다. 첫째, 척도는 총 28문항에서 13문항으로 수정되었으며, 연령다양성 8문항, 연령유연성 5문항으로 구성되었다. 둘째, 청년, 중년, 노년 집단으로 분류하여 다집단 요인분석에서 연령집단 간에 유의한 차이를 보이지 않는 것으로 나타나 전 연령에서 사용가능성이 확보되었다. 셋째, 연령집단 간 인구사회학적 특성에 따른 연령통합인식 차이에서 청년집단은 거주지역에서만 연령통합인식, 연령유연성, 연령다양성 차이를 보이는 것으로 나타났으며, 중년집단에서는 거주지역과 계층인식에서 연령통합인식, 연령 유연성, 연령다양성 차이를 보였다. 노년집단은 연령통합인식에서는 거주지역, 교육수준, 계층인식이 유의미하였으며, 연령유연성에서는 거주지역과 계층인식, 연령다양성에서는 거주지역과 교육수준에서 유의미한 차이를 보였다. 이러한 본 연구의 결과를 기반으로 향후 연령통합인식 향상을 위한 연구를 위한 방향과 정책 및 실천을 위한 함의를 제언하였다.

• 한국수학교육학회지시리즈A:수학교육
• /
• 제55권2호
• /
• pp.147-169
• /
• 2016

This study analyzes the mathematical creativity test as an illustrative example with scoring domains of fluency, flexibility and originality in order to make suggestions for obtaining maximum reliability based on a composite score depending on combinations of each scoring domain weights. This is done by performing a multivariate generalizability analysis on the test scores, which were allowed to access publicly, of 30 mathematically gifted elementary school students, and therefore error variances, generalizability coefficients, and effective weights have been calculated. The main results were as follows. First, the optimal weights should adjust to .5, .4, and .1 based on the maximum generalizability coefficient even though the original weights in the mathematical creativity test were equal for each scoring domain with fluency, flexibility and originality. Second, the mathematical creativity test using the three scoring domains of fluency, flexibility, and originality showed higher reliability than using one scoring domain such as fluency. These results are limited to the mathematical creativity test used in this study. However, the methodology applied in this study can help determine the optimal weights depending on each scoring domain when the tests constructed in various researchers or educational fields are composed of multiple scoring domains.

• 한국의류학회지
• /
• 제36권1호
• /
• pp.56-67
• /
• 2012

This research investigates the effect of the antecedents (i.e. specific investment, opportunistic behavior, communications, uncertainty, interdependence, power imbalance, shared value, and flexibility) that influence the trust and commitment of domestic apparel manufacturers toward contractors as well as the effect of trust and commitment on firm performance and relationship satisfaction. A total of 128 apparel manufactures participated in this study. Factor analysis, Cronbach's alpha coefficient, and path analysis were conducted for the statistical analysis. Specific investment, communication, shared value, and flexibility had a positive effect on trust; however, opportunistic behavior had a negative effect. Interdependence, shared value, and flexibility had a positive effect on commitment; however, power imbalance and uncertainty had a negative effect. Trust did not exert an effect on commitment in this research; however, trust and commitment had a positive effect on firm performance; in addition, trust and commitment had a positive effect on relationship satisfaction. The findings offer insight on how to better manage apparel manufacturer-contractor relationships to ensure success.