• Steel and Composite Structures
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• 제49권5호
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• pp.487-502
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• 2023

In the realm of nanotechnology, the nonlocal strain gradient theory takes center stage as it scrutinizes the behavior of spinning cantilever nanobeams and nanotubes, pivotal components supporting various mechanical movements in sport structures. The dynamics of these structures have sparked debates within the scientific community, with some contending that nonlocal cantilever models fail to predict dynamic softening, while others propose that they can indeed exhibit stiffness softening characteristics. To address these disparities, this paper investigates the dynamic response of a nonlocal cantilever cylindrical beam under the influence of external discontinuous dynamic loads. The study employs four distinct models: the Euler-Bernoulli beam model, Timoshenko beam model, higher-order beam model, and a novel higher-order tube model. These models account for the effects of functionally graded materials (FGMs) in the radial tube direction, giving rise to nanotubes with varying properties. The Hamilton principle is employed to formulate the governing differential equations and precise boundary conditions. These equations are subsequently solved using the generalized differential quadrature element technique (GDQEM). This research not only advances our understanding of the dynamic behavior of nanotubes but also reveals the intriguing phenomena of both hardening and softening in the nonlocal parameter within cantilever nanostructures. Moreover, the findings hold promise for practical applications, including drug delivery, where the controlled vibrations of nanotubes can enhance the precision and efficiency of medication transport within the human body. By exploring the multifaceted characteristics of nanotubes, this study not only contributes to the design and manufacturing of rotating nanostructures but also offers insights into their potential role in revolutionizing drug delivery systems.

• 비교교육연구
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• 제26권4호
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• pp.173-198
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• 2016

이 연구는 그동안 일본의 교육개혁 동향에 관한 국책연구기관의 연구가 미흡하고, 개인 연구들이 다소 지엽적인 과제에 대한 소개에 머물고 있다는 점에 착안하여, 최근 일본교육개혁 정책들을 문부과학성 및 중앙교육심의회를 중심으로 분석하여 그 특징을 추출하고 이를 전제로 개별 정책에 대한 평가를 시도하였다. 정책과정에 있어서 특징 분석은 체제분석방법을 원용하였다. 즉, '개혁정책의 배경 및 목표'를 통하여 투입측면을, '문부과학성과 중앙교육심의회를 거치는 정책의 수립과정'을 통하여는 과정측면을, '정책의 실효성 검증 및 반응'에서는 산출측면을, 그리고 환류 및 환경측면에서는 '정책 이해관계자와 사회의 합의 및 이해' 상황을 준거로 하여 진단하였다. 연구방법으로는 문헌연구방법(문부성 보고서 및 단행본, 논문)과 일본 현지를 방문하여 핵심관계자를 면담(중앙교육심의회 부회장등)하였고, 주제별 논객과의 대담과 현장 교사와의 면담도 실시하였다. 일본 교육개혁의 배경은 고도화와 경쟁력 가치에 두나 여유교육이라는 일본적 가치가 강조되었고 학력논쟁으로 이어졌다. 정책의 수립과정은 문부성에서 내각 등 정치권으로 옮겨가고 있는 특징을 보였다. 정책의 결과는 실효성 측면에서 현장으로부터 외면받는 경우가 적지 않았는데 현실에 대한 진단이 불충분한 정치적 실험과정이었다는 것이 원인이었다. 정책의 환류 면에서 결정과정이 공개되고 의견수렴 절차가 마련되어 있으나 객관적인 평가환류 시스템을 갖추지는 못했다. 교육개혁 정책에 대한 개별적 평가는 최근의 교육진흥기본계획, 교육기본법 개정, 수장의 교육개혁, 지방교육행정개혁, 교원개혁 정책 등에 걸쳐 살펴보았다.

• 보건교육건강증진학회지
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• 제22권1호
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• pp.17-40
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• 2005

This study was aimed to analyze the status of the a health education and the health behavior, and to identify the effected factors of health promotion behavior based on Green's PRECEDE Model among high school students The data was collected by interview survey with self-administration questionnaire from the selected high school students during the end of the second semester, 2001, and 1,591 students are analyzed. The statistical method of the analysing for effected factors of health promotion behavior was used the Multiple Linear Regression Analysis by SPSS package program. The results of this study are as fellows. 1. The index of the health educational contents shows the 18.14 points per 86 points, 18.96 points in girl students, 17.53 points in boy students. 2. In the index of health promotion behaviors was 84.9 points per 140 full points in all average; 61 points per 100 points. The experienced rate of smoking was $35\%$ of all students, $38.5\%$ of boy students, $30.6\%$ of girl students each. The experienced rate of drinking was $62.2\%$ of all students, $61.6\%$ of boy students, $69.4\%$ of girl students. 3. The effected factors of the health promotions behaviors to analyse by multiple linear regression model was sports activity, the degree of satisfaction of their school life, the academic records of school, the present health conditions, their awareness for hazard of smoking for their health, the experiences of the smoking, their stresses(R$^2$ =0.174). and the factors as the experiences of drinking, their stresses, and the indexes for the health education contents in their school were added in girls students.

• International journal of advanced smart convergence
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• 제9권2호
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• pp.195-202
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• 2020

The ultimate goal of CSV activities is to increase consumer loyalty to the company, brand or organization concerned. Thus, for a professional sports club, CSV activities will ultimately aim to enhance the loyalty of spectators who are consumers of the club. Subjects of this study are the spectators of professional volleyball. We distributed 300 survey to people who were aware of the club's CSV activities among the home spectators of Hyundai Capital SkyWalkers. Data processing was performed using SPSS 23 and AMOS 18 for the analysis of confirmed factors, correlation analysis, reliability analysis, and structural equation model analysis. From these results, we were able to come up with the social problem resolution and long-term orientation among the CSV activities of professional volleyball clubs which affect the club identification. And the identification formed within the spectators of the clubs through CSV affects the club loyalty directly or through the medium of club emotion. Professional volleyball clubs need to identify the problems the community has in planning and proceeding with CSV activities and seek strategies to address them together, and approach them from a long-term oriented perspective.

• Structural Engineering and Mechanics
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• 제85권6호
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• pp.729-742
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• 2023

It is a recent attraction to the mechanical scientists to investigate state of wave propagation, buckling and vibration in the sport balls to observe the importance of different parameters on the performance of the players and the quality of game. Therefore, in the present study, we aim to investigate the wave propagation in handball game ball in term of mass of the ball and geometrical parameters wit incorporation of the viscoelastic effects of the ball material into account. In this regard, the ball is modeled using thick shell structure and classical elasticity models is utilized to obtain the equation of motion via Hamilton's principle. The displacement field of the ball model is obtained using first order shear deformation theory. The resultant equations are solved with the aid of generalized differential quadrature method. The results show that mass of the ball and viscoelastic coefficient have considerable influence on the state of wave propagation in the ball shell structure.

• Child Health Nursing Research
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• 제15권2호
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• pp.145-154
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• 2009

Purpose: The purpose of this study was to develop a guide book on safety education for teachers to use in education classes for elementary school students. Methods: Dick & Carey's teaching model and Keller's ARCS theory were used in the development of this guide book. Results: This guide book was developed for lower grade (1st$\sim$3rd) and higher grade (4th$\sim$6th) elementary school students. The content consisted of subjects, worksheets, content for teachers, statistical data, case studies, and a safety letter to the parents. The 10 subjects were as follows: "Importance of injury prevention", "Safety at home", "Accident prevention at school", "Violence prevention", "Vehicles safety", "Water safety", "Prevention of Fires & Burns", "Safety of Toys & home supplies", "Safety in Sports & Recreation activity", "Prevention of injury caused by animals". Statistical data was presented by graphs and case studies were presented of cases of real occurrences of accidents. Worksheets contain various activities for students. Safety letters were composed for each student's parents. Conclusion: This guide book presents effective material for safety education classes in elementary school and the authors hope it will be widely used in elementary schools.

• 한국컴퓨터정보학회논문지
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• 제25권12호
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• pp.271-278
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• 2020

본 연구는 코로나 팬데믹 시대의 '비대면 홍보·미디어 전략과 방안'을 세계무예마스터십을 중심으로 살펴보고, 이를 다른 스포츠 이벤트에 적용할 수 있는 이론적 기초로 제시하고자 했다. 이를 위해 기존에 열린 1·2회 무예마스터십의 홍보·미디어 전략을 유형별로 나누어 내용분석하고 향후 3회 대회를 준비하는 세계무예마스터십위원회(WMC)의 국내외 홍보·미디어 기획 담당자들을 대상으로 심층인터뷰를 진행했다. 연구결과 대회 홍보·미디어의 직접적 차원인 '온라인(Online) 무예대회 개최와 언택트(Untact) 컨벤션 플랫폼, 거점 무예 교육시설 건립'은 예산만 뒷받침 된다면 성공적인 수행이 가능하며, 간접적 차원인 '무예 브랜드화, 대중화, 산업화'는 아이디어와 실행인력만 충분하면 코로나 팬데믹 시대를 극복할 새로운 방안이 될 수 있을 것으로 나타났다. IT강국의 저력과 충북 무예 인프라가 결합된다면 메가 스포츠 이벤트를 준비하는 지역 자치단체들은 '비대면-K스포츠'란 새로운 모델을 개척할 수 있을 것으로 판단된다.

• 운동과학
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• 제28권1호
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• pp.82-90
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• 2019

PURPOSE: The purpose of this study was to examine the association of waist to height ratio (WHtR) and resting heart rate (RHR) with cardio-metabolic risk factors among Korean postmenopausal women. METHODS: A cross-sectional analysis was performed using the 2015 Korea National Health and Nutrition Examination Survey. The analysis included a total of 1,540 postmenopausal women. RESULTS: Individuals with higher WHtR (>0.56) showed significantly higher glucose, triglyceride, insulin, Homeostatic Model Assessment for Insulin resistance (HOMA-IR), total cholesterol, systolic and diastolic blood pressure compared with ones with lower WHtR (≤0.51). Similar findings were found in those with higher RHR (≥90 bpm) compared with ones with lower RHR (<60 bpm) for glucose and HOMA-IR. When determining the combined effects of WHtR and RHR on the prevalence of metabolic syndrome, individual with WHtR above 0.5 and RHR above 80 bpm showed 10.39 times higher prevalence of metabolic syndrome compared with those with WHtR below 0.5 and RHR below 70 bpm. We further performed multiple linear regression analysis to understand how WHtR and RHR contribute to fasting glucose, and found that both WHtR and RHR contribute to fasting glucose levels independent of age, education level, marital status and income level. CONCLUSIONS: The current study showed that the WHtR and RHR are associated with cardio-metabolic risk factor and prevalence of metabolic syndrome in Korean postmenopausal women.

• 한국운동역학회지
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• 제25권1호
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• pp.29-37
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• 2015

Objective : The purpose of this study was to investigate the biomechanical properties of shock absorption strategy and postural stability during the drop landing for each types. Methods : The motions were captured with Vicon Motion Capture System, with the fourteen infra-red cameras (100Hz) and synchronized with GRF(ground reaction force) data(1000Hz). Ten male soccer players performed a drop landing with single-leg and bi-legs on the 30cm height box. Dependent variables were the CoM trajectory and the Joint Moment. Statistical computations were performed using the paired t-test and ANOVA with Turkey HSD as post-hoc. Results : The dominant leg was confirmed to show a significant difference between the left leg and right leg as the inverted pendulum model during Drop Landing(Phase 1 & Phase 2). One-leg drop landing type had the higher CoM displacement, the peak of joint moment with the shock absorption than Bi-leg landing type. As a lower extremity joint kinetics analysis, the knee joint showed a function of shock absorption in the anterior-posterior, and the hip joint showed a function of the stability and shock absorption in the medial-lateral directions. Conclusion : These findings indicate that the instant equilibrium of posture balance(phase 1) was assessed by the passive phase as Class 1 leverage on the effect of the stability of shock absorption(phase 2) assessed by the active phase on the effect of Class 2 leverage. Application : This study shows that the cause of musculo-skeletal injuries estimated to be focused on the passive phase of landing and this findings could help the prevention of lower damage from loads involving landing related to the game of sports.

• 한국융합학회논문지
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• 제12권2호
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• pp.317-326
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• 2021

본 연구는 댄스스포츠 참여 부부의 성격특성에 따른 부부친밀감의 자기 및 상대효과를 규명하는데 목적이 있으며 댄스스포츠에 참여하고 있는 부부 148쌍을 대상으로 자료를 수집하였다. 연구문제를 해결하기 위해 SPSS 25.0과 AMOS 25.0을 이용하여 APIM모형을 분석을 실시한 후 다음과 같은 결론을 얻었다. 첫째, 신경증과 관련하여 남편과 아내 모두 유의한 차이가 나타났으며, 남편의 부부친밀감에 대한 아내의 신경증은 부적 영향을 받았고 아내는 상대적으로 낮은 정적인 영향을 받는 것으로 나타났다. 둘째, 개방성과 관련하여 남편에게만 유의한 차이가 나타났으며, 남편의 부부친밀감에 대한 아내의 개방성은 상대적으로 부적 영향을 받는 것으로 나타났고 아내는 동일 수준의 정적인 영향을 받는 것으로 나타났다. 셋째, 외향성과 관련하여 아내에게만 유의한 차이가 나타났으며, 아내가 상대적으로 낮은 정적인 영향을 받는 것으로 나타났다. 넷째, 성실성과 관련하여 남편과 아내 유의한 차이가 나타나지 않았으며 서로 정적인 영향을 미치는 것으로 나타났다. 다섯째, 친화성과 관련하여 아내에게만 유의한 차이가 나타났으며, 아내가 상대적으로 낮은 정적인 영향을 받는 것으로 나타났다. 이를 통해 부부는 바람직한 여가활동을 선용하고 긍정적인 부부여가문화를 형성하여야 할 것이다.