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Accurate measurement of head volume is indispensable for precise assessments of body composition determined by hydrostatic weighing without head submersion. The purpose of this study was to establish a prediction equation for head volume measured by the immersion method from multiple regression analysis using head parameters (head circumference, head length, head breadth, neck girth and head thickness) as independent variables. The participants were 106 Japanese young adults (55 males and 51 females) aged 17-27 years. Intra-class correlation coefficients (ICCs) for each head parameter and head volume in males and females were very high (ICC = 0.993-0.999, 0.992-0.998). Head circumference was closely related to head volume measured by the immersion method (r = 0.719, 0.861, P < 0.05), and was the most important parameter for the prediction equation in both sexes. Head breadth was related poorly (r = 0.475, 0.500, P < 0.05) and showed a small individual difference. It was, therefore, excluded from the independent variables. The prediction equation for males was predicted head volume = 122.10X1 + 106.19X3 + 37.16X4 - 89.46X5 - 4754.93, R = 0.909, SEE = 121.75 ml, and that for females was predicted head volume = 213.83X1 + 45.24X3 + 36.85X4 - 74.34X5 - 8912.43, R = 0.913, SEE = 136.26 ml (where X1 = head circumference, X3 = head length, X4 = neck girth, X5 = head thickness, and SEE = standard error of the estimate). The limits of agreement for predicted and measured head volume were -234.5 to 234.1 ml for males, and -261.0 to 261.0 ml for females. In cross-validation groups of both sexes, there were no significant differences between measured head volume and predicted head volume. The correlation coefficients between measured head volume and predicted head volume in males and females were 0.894 and 0.908, respectively. The predicted head volume from prediction equations was considered to have high reliability and validity. 相似文献
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Donald Merriman Robin S. Codding Georgiana Shick Tryon Takuya Minami 《Psychology in the schools》2016,53(5):457-470
Research on the effectiveness of homework provides ample evidence that homework has a positive effect on learning, particularly for secondary students. Unfortunately, the rate of consistent homework completion for students, with and without disabilities, is low. This study used a between‐groups design to examine the differential effectiveness of coaching, a self‐management intervention, compared with the local treatment‐as‐usual (homework center) on improving the homework completion of 50 middle school students (Grades 6 to 8) with and without disabilities who were having substantial difficulty with homework. Results indicated that both group coaching and homework center (treatment‐as‐usual) were effective in significantly decreasing homework problems, with no clear indication that one intervention was, overall, superior to the other. However, preliminary analyses suggest that these interventions might be differentially effective as a function of disability status. 相似文献
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This study examines the professional experiences of casual relief teachers (CRTs) and some of the challenges they face through the lens of practice architecture theory. Practice architecture theory considers human activity through the multi-layered lens of sayings, doings and relatings. A survey was used to collect responses from 104 CRTs who are teaching or have previously taught in Australian primary schools. The responses were examined using thematic content analysis to gain insights into their experiences of professional practice. In addition, the demographic information from the survey identified three main categories of CRTs which contributed to better understanding of distinct needs and experiences of each type of CRT. Results indicate that many participants saw casual teaching as a negative and alienating experience due to lack of access to school information, lack of support for accreditation and feelings of exclusion from school communities. The need for greater access to information about professional learning was also highlighted. However, others enjoyed the flexibility and sense of belonging they experienced as CRTs. The present study contributes to CRT research by identifying similarities and differences across the three CRT groups and applying practice architectures as a new theoretical lens through which to analyse their professional experiences. 相似文献
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In 1972 a longitudinal study was launched in one of the largest department store chains in Japan. The purpose of this study was to investigate the managerial career development of the newly hired college graduates. The research design required repeated monitoring of a newcomer's progress within the organization at seven different points in time over a three-year period. The study investigated basic questions concerning the process of managerial career development: (1) Why do some people achieve a higher level of management progress during the early period of their organizational career, while others do not? (2) What are the important indicators of management development during the formative years in business? (3) How accurately can development in management be predicted? (4) What are the organizational and personal consequences of managerial development? Over the three-year period of this study data were collected on 80 newly hired college graduates. Two models that have been used to understand the process of early management development in the United States were tested. Results were compatible with these models. Performance at the end of three years was found to be significantly related to both initially assessed potential (assessment model) and developed working relationships (vertical exchange model). Other professional and organizational outcomes were significantly related to developed working relationships. The implications of this cultural generality are discussed. 相似文献
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结合运动员的工会组织全球化的趋势背景,以最早成立的全球化的运动员工会代表组织——国际职业足球运动员联盟（FIFPro）为中心,从1965年的早期着手开始,到近期的全球足球运动员工会成立,介绍该组织的历史以及在足球领域的立法和司法工作内容,并阐述超越体育运动框架的工会组织全球化的尝试以及今后的展望. 相似文献
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在发展中国家和一些有多种文化背景的发达国家里,民族数学已经获得了一定水平的发展动力。另一方面,起源于发达国家的批判性数学教育特别关注民族数学研究的批判性观点。在这种研究中,为了把民族数学和学校数学连接起来,并把它作为教育尝试,批判性数学教育和民族数学之间相辅相成的关系已被详细考虑。因此,为了通过互惠方式加强批判性本质和发展以民族数学为基础的数学教育,一个基础性的框架被建立。 相似文献
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Michihiro Hayashi Hiroshi Tachiya Naoki Asakawa Takuya Kawamura 《Journal of The Franklin Institute》2011,348(1):101-111
This study proposed a method for suppressing torques and consumed energy of manipulators considering an effect of inertial forces in order to achieve power-saved drive. The present paper describes the case that the start and end points of a work path of a manipulator are specified and the path between the points can be determined arbitrarily, which is so-called point-to-point (PTP) control. The proposed method determines both the initial pose of a manipulator and input motions of its joints so that the torque or consumed energy is suppressed. The input motion of the joint is expressed by a motion curve that indicates the time profiles of input displacements, velocities and accelerations. The proposed method determines the motion curve as a polynomial with appropriate coefficients. Those coefficients and their values are decided by a heuristic algorithm in order to suppress the input torques or consumed energy of a manipulator. The paper actually determines the power-saved drive motion of “PUMA560” by the proposed method and reveals its effectiveness. 相似文献