• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 추계학술대회논문집
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• pp.870-874
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• 2007

Golf ball spin rate after impact with club is created by the contact force, which is greatly influenced by ball and club mass, material, impact speed, and club loft angle. Previous studies showed that the contact force is determined as the resultant force of the reaction forces normal and tangential to the club face at the contact point. The normal force causes the compression and restitution of the ball, and the tangential force creates the spin. Especially, the tangential force takes either positive or negative values as the ball rolls and slides along the club face during impact. Although the positive and negative tangential forces are known to create and reduce the back spin rate, respectively, the mechanism of ball spin creation has not yet been discussed in detail. It is shown in this work that the linear impulse of the tangential force is directly related to generation of back spin rate of golf ball. The linear impulse can be calculated from the tangential force, which depends upon many factors such as ball and club mass, material, impact speed, and club loft angle. In this research, the influence of the contact force between golf club and ball is investigated to analyze the mechanism of impact. For this purpose, the contact force and the contact time at impact between golf club head and ball are computed using FEM.

• 한국소음진동공학회논문집
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• 제17권11호
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• pp.1127-1132
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• 2007

Golf ball spin rate after impact with club is created by the contact force, which is greatly influenced by ball and club mass, material, impact speed, and club loft angle. Previous studies showed that the contact force is determined as the resultant force of the reaction forces normal and tangential to the club face at the contact point. The normal force causes the compression and restitution of the ball, and the tangential force creates the spin. Especially, the tangential force takes either positive or negative values as the ball rolls and slides along the club face during impact. Although the positive and negative tangential forces are known to create and reduce the back spin rate, respectively, the mechanism of ball spin creation has not yet been discussed in detail. It is shown in this work that the linear impulse of the tangential force is directly related to generation of back spin rate of golf ball. The linear impulse can be calculated from the tangential force, which depends upon many factors such as ball and club mass, material, impact speed, and club loft angle. In this research, the influence of the contact force between golf club and ball is investigated to analyze the mechanism of impact. For this purpose, the contact force and the contact time at impact between golf club head and ball are computed using FEM.

• 디지털융복합연구
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• 제11권3호
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• pp.49-57
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• 2013

본 연구는 IT기반 사회에서 청소년들의 가정생활건강성과 학교생활만족도가 고등학생들의 심리적 안녕감에 대한 영향력을 살펴보았다. 청소년환경의 주된 생활공간인 가정과 학교의 관련요인이 청소년들의 심리적 안녕감 향상에 미치는 영향을 조사하기 위해 부산의 K인문계 고등학교 251명의 학생들을 대상으로 설문조사를 하였으며 다중회귀분석을 적용하였다. 첫째, 청소년들의 가정에서의 시간공유는 청소년들의 긍정적 대인관계에 긍정적인 영향을 줄 수 있는 것으로 나타났다. 또한 가정의 유대감은 청소년들의 긍정적 대인관계, 삶의 목적 및 개인적 성장에 긍정적인 영향을 미칠 수 있는 것으로 조사되었다. 특히 가정 내에서의 의사소통의 만족은 환경에 대한 통제에 도움을 줄 수 있는 요인으로 나타났다. 둘째, 청소년들의 학교생활만족은 심리적 안녕감의 자아수용과 환경에 대한 통제 및 삶의 목적에 긍정적인 영향을 주는 요인으로 분석되었다. 교우관계는 심리적 안녕감의 긍정적인 대인관계와 자율성 측면에, 수업일반은 심리적 안녕감의 자율성 측면에 긍정적인 영향을 미칠 수 있는 것으로 나타났다. 이와 같은 연구결과는 가정생활건강성과 학교생활만족도의 요인들이 청소년의 심리적 안녕감에 영향을 미칠 수 있음을 알 수 있었으며 나아가 청소년정책의 방안에도 고려될 수 있음을 알 수 있었다.

• Journal of Korean Neurosurgical Society
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• 제38권1호
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• pp.41-46
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• 2005

Objective : A study of the histopathologic and neurobehavioral correlates of cortical impact injury produced by increasing impact velocity using the controlled cortical impact[CCI] injury model is studied. Methods : Twenty-four Sprague-Dawley rats [$200{\sim}250g$] were given CCI injury using a pneumatically driven piston. Effect of impact velocity on a 3mm deformation was assessed at 2.5m/sec [n=6], 3.0m/sec [n=6], 3.5m/sec [n=6], and no injury [n=6]. After postoperative 24hours the rats were evaluated using several neurobehavioral tests including the rotarod test, beam-balance performance, and postural reflex test. Contusion volume and histopathologic findings were evaluated for each of the impact velocities. Results : On the rota rod test, all the injured rats exhibited a significant difference compared to the sham-operated rats and increased velocity correlated with increased deficit [p<0.001]. Contusion volume increased with increasing impact velocity. For the 2.5, 3.0, and 3.5m/sec groups, injured volumes were $18.8{\pm}2.3mm^3$, $26.8{\pm}3.1mm^3$, and $32.5{\pm}3.5mm^3$, respectively. In addition, neuronal loss in the hippocampal sub-region increased with increasing impact velocity. In the TUNEL staining, all the injured groups exhibited definitely positive cells at pericontusional area. However, there were no significant differences in the number of positive cells among the injured groups. Conclusion : Cortical impact velocity is a critical parameter in producing cortical contusion. Severity of cortical injury is proportional to increasing impact velocity of cortical injury.

• 한국운동역학회지
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• 제27권4호
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• pp.263-268
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• 2017

Objective: The purpose of this study was to show differences in impact variables between treadmills with (treadmills B, C, and D) and treadmills without a shock-absorbing function (treadmill A) to propose the development of a treadmill with improved or added shock-absorbing function to reduce impact shock. Method: Thirteen male students in their twenties who had habitual rear foot strike during running ran on four treadmills at 2.67 m/sec while ankle and neck acceleration data were collected. The magnitude of the ankle and neck acceleration peaks and peak positive ankle acceleration were calculated. The power spectral density of each signal was calculated to transform the ankle and neck accelerations in the frequency domain. Results: The peak positive ankle acceleration on treadmill B was significantly lesser than that on treadmills A and D, and that on treadmill C was significantly less than that on treadmill A (p < .01). Peak positive neck acceleration was not statistically different between the treadmills. The frequencies of the peak power of the ankle and neck acceleration signal within the lower and higher frequency ranges were not statistically different between the treadmills. The signal power magnitude of the ankle in higher frequency ranges on treadmill B was significantly less than that on treadmills A, C, and D (p < .01). The signal power magnitude of the ankle in higher frequency ranges was not statistically different between the treadmills. The signal power magnitudes of the neck acceleration signal within the lower and higher frequency ranges were not statistically significantly different between the treadmills. Conclusion: Our results indicate that the shock-absorbing function of a treadmill plays a role in reducing impact shock. Therefore, in future treadmill development, shock-absorbing function should be improved or incorporated to reduce impact shock to the body.

• 한국의료질향상학회지
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• 제23권1호
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• pp.69-90
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• 2017

Purpose: The purpose of this study was to analyze the impact of healthcare accreditation and to provide empirical evidence to validate positive effectiveness. Methods:Six electronic databases (KERIS, KoreaMed, NDSL, Ovid-medline, Embase, Cochrane library) were accessed in May 2016. Keywords used were 'accreditation' and 'Joint Commission on Accreditation of Healthcare Organization (JCAHO)'. Of the initially identified 3,008 articles, 60 studies on healthcare accreditation were selected based on inclusion criteria that are hospital accreditation, accreditation by disease and clinical center accreditation. These were retrieved and analyzed. Result: The 60 study results were on the impact of healthcare accreditation. Results were classified into four perspectives of Balanced Score Card (Financial, Customer, Internal Process, Learning & Growth). In internal process perspective, results revealed that healthcare accreditation has made a positive impact on "care process and procedure". In learning & growth perspective, healthcare accreditation has made a positive influence on "leadership", "organizational cultures" and "change mechanisms". However, it revealed that healthcare accreditation does not directly affect financial performance. It is also difficult to reach a definitive conclusion that healthcare accreditation programs affect patient satisfaction of customer and clinical outcome of the internal process. Conclusion: Healthcare accreditation programs provide positive impact on change of care process and building communication-oriented hospital culture. However, more rigorous and diverse research is needed on financial effects and clinical outcomes of healthcare accreditation.

• 한국경영과학회지
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• 제35권2호
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• pp.89-114
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• 2010

This study empirically investigated the effects of the target costing system as well as information technology(IT) infrastructure on the knowledge management processes(i.e., socialization, externalization, combination and internalization) and the performance of a firm. This study also examined an impact of the social capital(i.e., inter-departmental communication, trust, cooperation and integration) on the adoption and development of the target costing and the IT infrastructure. The results of this study showed that inter-departmental communication, trust and integration have a significant positive impact on the adoption of the target costing. It was also found that the effects of inter-departmental communication and integration on the development of storage and transfer infrastructure are significant and positive. However, in the adoption of search infrastructure, only the impact of inter-departmental integration was significant. The results of regression analyses presented that the target costing has significant influence on the four processes of knowledge management. It was also observed that the effects of storage and transfer infrastructure on combination are significant and positive. In search infrastructure, the impact on combination and internalization was significant. According to the results of this study, it was found that when the adoption level of the target costing is high, search infrastructure mainly affects the three processes(i.e., socialization, combination and internalization). However, under a low adoption level of the target costing, the impact of storage and transfer infrastructure on the whole processes was significant and positive. Thus, it is assumed that storage and transfer infrastructure complements a low level of the target costing adoption through the active transfer and sharing of explicit and tacit knowledge.

• 융합정보논문지
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• 제8권4호
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• pp.1-8
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• 2018

본 연구의 목적은 교정환자의 일반적 특성과 구강건강영향지수, 자아존중감 및 신체상과의 연관성을 파악하여 교정환자의 상담 시 기초자료로 활용하고자 한다. 연구대상은 서울 대전 청주지역의 교정치과에 내원한 환자로 자료 수집은 2018년 5월 1일부터 5월 30일까지 자기기입식방법으로 설문을 작성하였다. 구강건강영향지수와 자아존중감은 양의 상관관계가 있는 것으로 나타났고, 신체상과도 양의 상관관계가 있는 것으로 나타났다. 자아존중감과 신체상도 양의 상관관계를 나타냈다. 긍정적인 신체상 및 자아존중감의 변화를 경험하고 향상시킬 수 있도록 치료 시 이해를 바탕으로 한 교정 상담과 교육프로그램 개발이 요구된다.

• 한국조리학회지
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• 제22권7호
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• pp.222-234
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• 2016

본 연구에서는 프랜차이즈 레스토랑의 브랜드 자산과 브랜드 가치가 소비자 애호도와 소비자 만족도에 얼마나 영향을 끼치는지 측정하였다. 선행연구를 토대로 변수간의 영향관계를 규명하고자 하였다. 본 연구의 설문 조사는 프랜차이즈 레스토랑 이용경험이 있는 소비자들을 대상으로 2016년 3월 1일부터 4월 11일까지 시행하였으며, 서울과 수도권을 중심으로 설문을 받아 진행하였다. 연구결과, 프랜차이즈 레스토랑의 브랜드 자산과 브랜드 가치는 소비자 애호도에 긍정적인 영향을 미치는 것으로 나타났고, 소비자 애호도는 소비자 만족도에 긍정적인 영향을 나타냈다. 또한, 프랜차이즈 레스토랑의 브랜드 자산과 브랜드 가치는 소비자 애호도에 긍정적인 영향을 미치는 것으로 나타났다.

• 유통과학연구
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• 제18권10호
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• pp.25-38
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• 2020

Purpose: Traditional markets have served as important locations for social-cultural and economic activities. It is a hub of economic transactions and where people gather and exchange information and goods, while also serving as the center of social activities, including commercial exchanges. Accordingly, this study aimed to contribute to the studies on the perceived value in traditional markets for customers in different aspects. Research design, data, and methodology: To analyze the proposed model, data was collected from 456 respondents and analyzed with SPSS 21.0 and AMOS 21.0. The data was analyzed with structural equation modeling (SEM) using path analysis. Results: According to the results of the analysis, the perceived value comprises utilitarian value, emotional value, economic value, and social value, all of which had a positive impact on attitude. Emotional value and social value had a positive impact on subjective norms, while utilitarian value and economic value did not have an impact on subjective norms. Also, attitudes and subjective norms were found to have a positive impact on behavioral intention. Conclusions: Through this study, the value that the traditional markets need to provide to consumers have been identified. Traditional markets should develop into places that can provide value for their consumers.