排序方式： 共有64条查询结果，搜索用时 480 毫秒
21.
中国自改革开放后,＂包＂（承包）的方法在各个领域被广泛地运用,成为支撑经济高速增长的一个重要因素和中国的一个特色。从制度经济学的角度重新解读柏祐贤的＂包＂的伦理规范,并以此为参照,分析中国的经济制度,以期发现中国经济的某些独特性。 相似文献
22.
In fixed order quantity systems,uncertainty in lead time is expressed as a set of scenarios with occurrence probabilities,and the mean and variance in demand distribution are supposed to be changeable according to a known pattern.A new concept of ＂dynamic robust optimal reorder point＂ is proposed in this paper and its value is calculated as a ＂robust optimal reorder point function with respect to reorder time＂.Two approaches were employed in determining the dynamic optimal reorder point.The first is a shortage rate satisfaction approach and the second is a backorder cost minimization approach.The former aims at finding the minimum value of reorder point at each reorder time which satisfies the condition that the cumulative distribution function （CDF） of shortage rate under a given set of scenarios in lead time is greater than or equal to a basic CDF of shortage rate predetermined by a decision-maker.In the latter approach,the CDF of closeness of reorder point is defined at each reorder time to express how close to the optimal reorder points under the set of scenarios,and the dynamic optimal reorder point is defined according to stochastic ordering.Some numerical examples demonstrate the features of these dynamic robust optimal reorder points. 相似文献
23.
Jill P. Koyama 《教育政策杂志》2013,28(5):701-720
This article ethnographically examines the ways in which No Child Left Behind (NCLB) links local practices to the centralized processing of data through its narrowing of procedures and measurements aimed at accountability. Framed by actor-network theory, it draws upon data consistently collected between June 2005 and October 2008, and then intermittently through October 2010, to consider the ways in which policy technologies, such as standardized testing, bring together New York City (NYC) public schools, district administrators, for-profit educational support businesses, and government officials to address the accountability requirements of NCLB. This article reveals how, through a range of sophisticated mechanisms that support the generation and comparison of data, NYC schools become reduced to data calculation and management centers. NCLB’s standardization, privatization, and marketization encourage local policy actors to become complicit in standardizing and quantifying academic assessment through their reliance on services and products marketed to schools and districts that are not meeting academic benchmarks. These services, mostly offered by for-profit vendors, help keep schools in compliance with policy requirements, but replace a focus on student learning with the production, management, and sometimes the fabrication, of data. 相似文献
24.
25.
铃木博之 《常熟理工学院学报》2022,36(1):54-60
本文以云南迪庆香格里拉藏语为例,讨论如何利用地理语言学的方法来了解语音演变的过程和地理分布之间的关系。地理语言学的研究对象大多以词形为主,针对语音演变的地理语言学研究由于音变的自律性而不适用于演变过程的分析。本文指出,在某一个具有历史资料背景的小范围内,我们可以使用地理语言学的方法对语音演变的地理分布进行分析及解释。 相似文献
26.
Shinya Sano Yasuo Ikegami Hiroyuki Nunome Tommy Apriantono Shinji Sakurai 《Journal of sports sciences》2013,31(4):381-391
Abstract A new method was established for the continuous measurement of force applied from a springboard to a gymnast in vaulting (board reaction force). Male gymnasts performed a handspring vault using a springboard mounted on force platforms. A high-speed video camera sampled the springboard motion at 500 Hz. The springboard was initially partitioned into 29 segments. The force due to the accelerative motion of the springboard was determined by summing the forces of the individual segments. The board reaction force acting on the gymnast was calculated by subtracting the force due to the accelerative motion of the springboard and weight from the force recorded by the force platform. The new method succeeded in illustrating transient changes of the board reaction force. The horizontal and vertical components of the peak values of the board reaction force were three and two times greater respectively than the average values. A series of tests was conducted to determine whether the number of segments of the springboard model could be reduced without affecting accuracy. A model consisting of only four segments produced almost the same accuracy as the 29-segment model. The simplified model is recommended as a more efficient method to measure board reaction force. 相似文献
27.
Koichiro Inoue Hiroyuki Nunome Thorsten Sterzing Hironari Shinkai Yasuo Ikegami 《Journal of sports sciences》2013,31(11):1023-1032
AbstractWe aimed to illustrate support leg dynamics during instep kicking to evaluate the role of the support leg action in performance. Twelve male soccer players performed maximal instep kicks. Their motions and ground reaction forces were recorded by a motion capture system and a force platform. Moments and angular velocities of the support leg and pelvis were computed using inverse dynamics. In most joints of the support leg, the moments were not associated with or counteracting the joint motions except for the knee joint. It can be interpreted that the initial knee flexion motion counteracting the extension joint moment has a role to attenuate the shock of landing and the following knee extension motion associated with the extension joint moment indirectly contributes to accelerate the swing of kicking leg. Also, appreciable horizontal rotation of the pelvis coincided with increase of the interaction moment due to the hip joint reaction force on the support leg side. It can be assumed that the interaction moment was the main factor causing the pelvis counter-clockwise rotation within the horizontal plane from the overhead view that precedes a proximal-to-distal sequence of segmental action of the swing leg. 相似文献
28.
Kohei Watanabe Hiroyuki Nunome Koichiro Inoue Takahiro Iga Hiroshi Akima 《Sports biomechanics / International Society of Biomechanics in Sports》2020,19(3):295-306
ABSTRACTA possible link between soccer-specific injuries, such as groin pain and the action of hip adductor muscles has been suggested. This study aimed to investigate neuromuscular activation of the adductor magnus (AM) and longus (AL) muscles during instep and side-foot soccer kicks. Eight university soccer players performed the two types of kick at 50%, 75% and 100% of the maximal ball speed. Surface electromyography (EMG) was recorded from the AM, AL, vastus lateralis (VL) and biceps femoris (BF) muscles of both kicking and supporting legs and the kicking motions were three-dimensionally captured. In the kicking leg, an increase in surface EMG with an increase in ball speed during instep kicking was noted in the AM muscle (p < 0.016), but not in AL, VL or BF muscles (p > 0.016). In the supporting leg, surface EMG of both AM and AL muscles was significantly increased with an increase in the ball speed before ball impact during both instep and side-foot kicks (p < 0.016). These results suggest that hip adductor muscles markedly contribute to either the kicking or supporting leg to emphasise the action of soccer kicks. 相似文献
29.
Hiroyuki Hattori 《Prospects》2009,39(2):185-199
Since 2001 the government of Cambodia has striven to advance policy-led education reform based on a sector-wide approach.
This paper critically reviews the status and progress of Cambodia’s education reform from the perspective of the aid’s effectiveness.
The paper looks at the performance of the sector reform in the three priority areas highlighted in the Accra Agenda of Action
on Aid Effectiveness: (a) strengthening country ownership; (b) building more effective and inclusive partnership; and (c)
delivering and accounting for development results. The study finds that while substantial progress was made in the development
of essential components of an effective sector programme, further consolidation and refinements are necessary in several priority
areas in order to bring about tangible improvements in education outcomes. The study provides concrete policy recommendations
to further enhance the effectiveness of aid to Cambodia’s education sector. 相似文献
30.
Kazuya Takeda Soichiro Koyama Tomoko Nagai Hiroaki Sakurai Yoshikiyo Kanada 《Measurement in physical education and exercise science》2018,22(1):19-24
The aim of this study was to clarify the intra- and inter-rater reliability of the rate of force development in hip abductor muscle force measurements using a hand-held dynamometer. Thirty healthy adults were separately assessed by two independent raters on two separate days. Rate of force development was calculated from the slope of the force-time curve that was divided into four time intervals (50, 100, 200, and 300 ms). The highest values of the three trials were used for statistical analysis. The intra-class correlation coefficient with a 95% confidence interval, standard error of measurement, and minimal detectable change at the 95% confidence level were calculated for each interval. For assessment of systematic error, Bland-Altman analysis was used. The results indicated that intra- and inter-rater reliability of the highest values at all intervals were sufficient (intra-class correlation coefficient > .7). The Bland-Altman analysis did not show systematic error in either reliability measure. 相似文献