Improved determination of dynamic balance using the centre of mass and centre of pressure inclination variables in a complete golf swing cycle     

Ahnryul Choi  Taeyong Sim 《Journal of sports sciences》2016,34(10):906-914

Golf requires proper dynamic balance to accurately control the club head through a harmonious coordination of each human segment and joint. In this study, we evaluated the ability for dynamic balance during a golf swing by using the centre of mass (COM)–centre of pressure (COP) inclination variables. Twelve professional, 13 amateur and 10 novice golfers participated in this study. Six infrared cameras, two force platforms and SB-Clinic software were used to measure the net COM and COP trajectories. In order to evaluate dynamic balance ability, the COM–COP inclination angle, COM–COP inclination angular velocity and normalised COM–COP inclination angular jerk were used. Professional golfer group revealed a smaller COM–COP inclination angle and angular velocity than novice golfer group in the lead/trail direction (P < 0.01). In the normalised COM–COP inclination angular jerk, the professional golfer group showed a lower value than the other two groups in all directions. Professional golfers tend to exhibit improved dynamic balance, and this can be attributed to the neuromusculoskeletal system that maintains balance with proper postural control. This study has the potential to allow for an evaluation of the dynamic balance mechanism and will provide useful basic information for swing training and prevention of golf injuries.  相似文献   

从语言与思维的关系看中国传统思维方式对汉语词汇的影响     

崔馝席 《山东教育学院学报》2008,23(2):72-73

语言是思维的工具,又是思维的产物,人类思维的某些方面总不可避免地在语言中留下印记。汉语词汇中,事物的形体因素和情景图像表现突出,这是重直觉、重类比、重了悟的中国传统思维方式渗透的结果。  相似文献   

Adaptive relevance feedback method of extended Boolean model using hierarchical clustering techniques     

Jongpill Choi  Minkoo Kim  Vijay V. Raghavan 《Information processing & management》2006

The relevance feedback process uses information obtained from a user about a set of initially retrieved documents to improve subsequent search formulations and retrieval performance. In extended Boolean models, the relevance feedback implies not only that new query terms must be identified and re-weighted, but also that the terms must be connected with Boolean And/Or operators properly. Salton et al. proposed a relevance feedback method, called DNF (disjunctive normal form) method, for a well established extended Boolean model. However, this method mainly focuses on generating Boolean queries but does not concern about re-weighting query terms. Also, this method has some problems in generating reformulated Boolean queries. In this study, we investigate the problems of the DNF method and propose a relevance feedback method using hierarchical clustering techniques to solve those problems. We also propose a neural network model in which the term weights used in extended Boolean queries can be adjusted by the users’ relevance feedbacks.  相似文献   

Integration of a social skills training: a case study of children with low social skills     

Dong Hwa Choi 《Education 3-13》2013,41(3):249-264

This study explores changes in children's social skills after a cognitive-social skills model intervention. The intervention was conducted over a period of 12 weeks within a regular preschool setting. Sixteen children including four considered to have low social skills participated in the study. Data analysis revealed that the four children with low social skills demonstrated changes in social skills through positive play behaviours such as asking positive questions, offering suggestions, initiating play episodes, and sharing play materials, although they had limited ability to maintain play episodes.  相似文献   

Orthogonal nonnegative matrix tri-factorization for co-clustering: Multiplicative updates on Stiefel manifolds     

Jiho Yoo  Seungjin Choi 《Information processing & management》2010

Matrix factorization-based methods become popular in dyadic data analysis, where a fundamental problem, for example, is to perform document clustering or co-clustering words and documents given a term-document matrix. Nonnegative matrix tri-factorization (NMTF) emerges as a promising tool for co-clustering, seeking a 3-factor decomposition X≈USV^?$\mathit{X}\approx {\mathit{USV}}^{?}$ with all factor matrices restricted to be nonnegative, i.e., U?0,S?0,V?0.$\mathit{U}?0\text{,}\mathit{S}?0\text{,}\mathit{V}?0\text{.}$ In this paper we develop multiplicative updates for orthogonal NMTF where X≈USV^?$\mathit{X}\approx {\mathit{USV}}^{?}$ is pursued with orthogonality constraints, U^?U=I,${\mathit{U}}^{?}\mathit{U}=\mathit{I}\text{,}$ and V^?V=I${\mathit{V}}^{?}\mathit{V}=\mathit{I}$, exploiting true gradients on Stiefel manifolds. Experiments on various document data sets demonstrate that our method works well for document clustering and is useful in revealing polysemous words via co-clustering words and documents.  相似文献   

Designing a business model for financial products for cultural heritage in the Korean market     

Hee Min Choi  Bong Hwan Ko  So Young Sohn 《Journal of Cultural Heritage》2010,11(3):315-320

There are many contingent valuation (CV) studies to estimate the economic benefits of cultural heritage, but few provided advice on the design of financial products for cultural heritage assets. This paper conducted conjoint and willingness-to-pay (WTP) analyses for providing the design implication of these financial products. We calculated WTP for each attribute. The result of conjoint analysis shows that people prefer a short period of investment, high-expected rate of return and small amount of money invested. Only the amount invested and the rate of return on investment are significant to estimate WTP for these financial products.  相似文献   

Student participation in a dementia-outreach research project as community-based experiential learning     

Sora Choi 《Educational gerontology》2017,43(4):186-197

People with dementia (PWD) and their family caregivers need an increasing number of diverse health and social services. A multidisciplinary person-centered approach to dementia services is required to meet the complex needs of PWD and their family caregivers. However, educational programs struggle to prepare health and social work students to meet the complex needs of PWD and their family caregivers. This study aimed to assess the self-efficacy, competence, target complaints, and attitudes regarding interactions with PWD and their family caregivers among healthcare and social work students who participated in a large community dementia-outreach research project. A one-group pretest and posttest design was used to collect data from 23 undergraduate students studying nursing, public health, or social work. Students participated in a community dementia-outreach research project as an extracurricular activity. Quantitative and qualitative data were collected using a pre- and post-participation self-report questionnaire. Students showed increased self-efficacy and competence after project participation. Students’ perceived barriers to interacting with PWD and their family caregivers decreased. In answering open-ended questions, students showed enhanced understanding of PWD and their family caregivers, positive attitudes toward dementia care, and a career preference for dementia care. Findings provided evidence of the benefits of community-research-project participation as an experiential learning tool to enhance dementia care among health and social work students.  相似文献   

Psychosocial factors influencing competency of children's statements on sexual trauma     

Kim TK  Choi S  Shin YJ 《Child abuse & neglect》2011,35(3):173-179

Objectives

The objectives of this study are to assess children's competence to state their traumatic experience and to determine psychosocial factors influencing the competency of children's statements, such as emotional factors of children and parents and trauma-related variables, in Korean child sex abuse victims.

Methods

We enrolled 214 children, who visited “Sunflower Children's Center” for sexual abuse. The children were aged 8-13 years. The children's parent were surveyed using questionnaires [Beck Depression Inventory (BDI), State-Trait Anxiety Inventory(STAI)] to obtain demographic information, traumatic event profiles and self-report scale. Children completed psychological measures as follows: Children's Depression Inventory (CDI), Revised Children's Manifest Anxiety Scale (RCMAS), Traumatic Symptom Checklist for Children (TSCC). The modified-Criteria-Based Content Analysis (CBCA) was used to assess children's statements. ANOVA, independent t-test, Pearson correlation were used. All statistics were demonstrated using SPSS 12.0.

Results

Modified-CBCA scores did not differ according to children's level of depression and anxiety. Children with parents who showed supportive reactions, scored significantly higher on the modified-CBCA scores than those with unsupportive parents. Children with severely depressed parents had lower modified-CBCA scores than those with less depressed parents. Modified-CBCA scores were significantly higher in participants who experienced a single traumatic event than those who had multiple events. However, the severity of sexual abuse, relationship with the perpetrator, types of disclosure, and duration of initial disclosure did not show significant differences in capability of statement.

Conclusion

In conclusion, the competence of statements in Korean sexually child sex abuse victims is related to parental emotional states and support rather than children's factors such as psychopathology or age, and appears to be more reliable with a single traumatic experience. Therefore, promoting parental support through psychoeducation is one of the most important things to be done to help children overcome psychologic trauma but also enhance the accuracy of their statement.  相似文献   

The unfolding of the Korean client- and counselor-rated real relationship and the counseling outcome in Korea     

Lee  Eunju  Choi  Han Na 《Asia Pacific Education Review》2019,20(4):533-542

Asia Pacific Education Review - The purpose of this study is to examine the unfolding of counselor-client-rated real relationships over the course of counseling as well as to verify whether the...  相似文献   

A Place for Materials Science: Laboratory Buildings and Interdisciplinary Research at the University of Pennsylvania     

Hyungsub Choi  Brit Shields 《Minerva》2015,53(1):21-42

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