研究利用结合管理策略的自然可处置和管理可处置非径向DEA方法测度了中国16家上市银行2006-2012年期间的规模报酬(returns to scale,RTS)和规模损害(damages to scale,DTS)程度。测度结果表明:除平安银行、华夏银行和光大银行可通过扩...研究利用结合管理策略的自然可处置和管理可处置非径向DEA方法测度了中国16家上市银行2006-2012年期间的规模报酬(returns to scale,RTS)和规模损害(damages to scale,DTS)程度。测度结果表明:除平安银行、华夏银行和光大银行可通过扩大投入规模改善经营能力外,中信银行、浦发银行和所有国有上市银行应通过压缩投入规模或改善管理水平提高经营能力,改善目前管理水平是其他股份制上市银行提高经营能力的最佳策略;南京银行、北京银行、宁波银行和平安银行可在扩大投入规模经营时保持较高的风险能力,其他上市商业银行应通过减少投入或改善风险管理水平提高风险能力。总体而言,国有上市银行存在投入过度的情况,其过多的投入不仅抑制其提升经营能力,还阻碍其改进风险能力。展开更多
Purpose: The aims of this study were to assess differences of limb symmetry index (LSI) in strength- and coordination-related tasks between high-level, competitive, noninjured ski racers of different age-related pe...Purpose: The aims of this study were to assess differences of limb symmetry index (LSI) in strength- and coordination-related tasks between high-level, competitive, noninjured ski racers of different age-related performance levels and to prospectively assess limb differences as a possible risk factor for traumatic and overuse injury in youth ski racers. Methods: The study (Study 1) included 285 high-level competitive ski racers (125 females, 160 males) of 3 age-related performance levels and based on the school system: 95 youth (10-14 years, secondary modem school), 107 adolescent (15-19 years, grammar school), and 83 elite athletes (20-34 years). To investigate the second aim (Study 2), 67 of the 95 youth athletes were included and any traumatic or overuse injuries were prospectively recorded over 2 seasons. All athletes performed 4 unilateral tests (strength related: one-leg counter movement jump (OL-CMJ) and one-leg isometric/isokinetic press strength test (OL-ILS); coordination related: one-leg stability test (OL-ST) and one-leg speedy jump test (OL-SJ)). The LSI was calculated by dividing the dominant leg by the nondominant leg and multiplying by 100. Kruskal-Wallis H tests and binary logistic regression analyses were conducted. Results: There were significant differences between the LSI of the 3 age-related performance-level groups only in the strength-related tests: the OL-CMJ (X^2(2, 285) = 9.09; p = 0.01) and the OL-ILS (X^2(2,285) = 14.79; p 〈 0.01). The LSI for OL-ILS was found to be a significant risk factor for traumatic injury in youth ski racers (Wald = 7.08; p 〈 0.01). No significant risk factors were found for overuse injuries. Conclusion: Younger athletes display slightly greater LSI values only in the strength-related tests. The cut-off value of limb differences of 〈 10% for return to sport decisions seems to be appropriate for elite athletes, but for youth and adolescent athletes it has to be critically discussed. It seems to be necessary to define thresholds based on specific performance tasks (strength vs. coordination related) rather than on generalizations, and age-related performance levels must be considered. Limb differences in unilateral leg extension strength represent a significant injury risk factor in youth ski racers.2018 Published by Elsevier B.V. on behalf of Shanghai University of Sport. This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/).展开更多
This paper intends to examine the motivation of diversification. We choose the Shanghai listed companies that adopted a diversification strategy in 2011 but realized a declined performance in 2012 as the study samples...This paper intends to examine the motivation of diversification. We choose the Shanghai listed companies that adopted a diversification strategy in 2011 but realized a declined performance in 2012 as the study samples, and come to the following conclusions: (1) The macro environment will affect the implementation of the diversification strategy for some industries, such as extractive industry, wood furniture industry, rubber industry, and the building industry; (2) As to the sample of downward performance diversified companies, the shareholders' benefits transfer motivation is an important consideration. Further analysis shows that there are some differences in the degree of diversification, benefits transfer motivation, and the degree of income impairment when the sample is classified by corporate nature, growth stage, and firm size. The differences are more obvious in different corporate natures; and (3) A clear correlation between the management ability and the degree of income impairment is not found. But there are some correlations between ownership concentration and the degree of income impairment.展开更多
文摘研究利用结合管理策略的自然可处置和管理可处置非径向DEA方法测度了中国16家上市银行2006-2012年期间的规模报酬(returns to scale,RTS)和规模损害(damages to scale,DTS)程度。测度结果表明:除平安银行、华夏银行和光大银行可通过扩大投入规模改善经营能力外,中信银行、浦发银行和所有国有上市银行应通过压缩投入规模或改善管理水平提高经营能力,改善目前管理水平是其他股份制上市银行提高经营能力的最佳策略;南京银行、北京银行、宁波银行和平安银行可在扩大投入规模经营时保持较高的风险能力,其他上市商业银行应通过减少投入或改善风险管理水平提高风险能力。总体而言,国有上市银行存在投入过度的情况,其过多的投入不仅抑制其提升经营能力,还阻碍其改进风险能力。
文摘Purpose: The aims of this study were to assess differences of limb symmetry index (LSI) in strength- and coordination-related tasks between high-level, competitive, noninjured ski racers of different age-related performance levels and to prospectively assess limb differences as a possible risk factor for traumatic and overuse injury in youth ski racers. Methods: The study (Study 1) included 285 high-level competitive ski racers (125 females, 160 males) of 3 age-related performance levels and based on the school system: 95 youth (10-14 years, secondary modem school), 107 adolescent (15-19 years, grammar school), and 83 elite athletes (20-34 years). To investigate the second aim (Study 2), 67 of the 95 youth athletes were included and any traumatic or overuse injuries were prospectively recorded over 2 seasons. All athletes performed 4 unilateral tests (strength related: one-leg counter movement jump (OL-CMJ) and one-leg isometric/isokinetic press strength test (OL-ILS); coordination related: one-leg stability test (OL-ST) and one-leg speedy jump test (OL-SJ)). The LSI was calculated by dividing the dominant leg by the nondominant leg and multiplying by 100. Kruskal-Wallis H tests and binary logistic regression analyses were conducted. Results: There were significant differences between the LSI of the 3 age-related performance-level groups only in the strength-related tests: the OL-CMJ (X^2(2, 285) = 9.09; p = 0.01) and the OL-ILS (X^2(2,285) = 14.79; p 〈 0.01). The LSI for OL-ILS was found to be a significant risk factor for traumatic injury in youth ski racers (Wald = 7.08; p 〈 0.01). No significant risk factors were found for overuse injuries. Conclusion: Younger athletes display slightly greater LSI values only in the strength-related tests. The cut-off value of limb differences of 〈 10% for return to sport decisions seems to be appropriate for elite athletes, but for youth and adolescent athletes it has to be critically discussed. It seems to be necessary to define thresholds based on specific performance tasks (strength vs. coordination related) rather than on generalizations, and age-related performance levels must be considered. Limb differences in unilateral leg extension strength represent a significant injury risk factor in youth ski racers.2018 Published by Elsevier B.V. on behalf of Shanghai University of Sport. This is an open access article under the CC BY-NC-ND license. (http://creativecommons.org/licenses/by-nc-nd/4.0/).
文摘This paper intends to examine the motivation of diversification. We choose the Shanghai listed companies that adopted a diversification strategy in 2011 but realized a declined performance in 2012 as the study samples, and come to the following conclusions: (1) The macro environment will affect the implementation of the diversification strategy for some industries, such as extractive industry, wood furniture industry, rubber industry, and the building industry; (2) As to the sample of downward performance diversified companies, the shareholders' benefits transfer motivation is an important consideration. Further analysis shows that there are some differences in the degree of diversification, benefits transfer motivation, and the degree of income impairment when the sample is classified by corporate nature, growth stage, and firm size. The differences are more obvious in different corporate natures; and (3) A clear correlation between the management ability and the degree of income impairment is not found. But there are some correlations between ownership concentration and the degree of income impairment.