X射线图像和CT图像的投影配准     

张惠  罗立民  舒华忠  李松毅 《东南大学学报》2003,19(1):26-30

提出了一种基于Chamfer3-4距离变换和模拟退火优化的方法，用于X射线图像和CT图像间的配准．首先，建立一个初始化的几何变换矩阵．为了便于计算，通过X射线设备的几何模型重新建出变换矩阵．然后，通过定义三维投影和二维物体图像之间的距离，并且通过优化算法来使之达到最小．该方法同样被用于医学介入手术中，处理从三维图像工作站中获取的主动漫游数据．  相似文献   

Possible reasons for low scientific literacy of Slovak students in some natural science subjects     

Renata Bellová  Danica Melicherčíková  Peter Tomčík 《Research in Science & Technological Education》2018,36(2):226-242

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The challenges of setting up the evaluation of extension systems by using a systems approach: the case of Greece,Italy and Slovenia     

Evagelos D. Lioutas  Chrysanthi Charatsari  Majda Černič Istenič  Giuseppe La Rocca  Marcello De Rosa 《The Journal of Agricultural Education and Extension》2019,25(2):139-160

Purpose: Considering current debates on ecosystem services’ effectiveness and the AIS/AKIS functioning, in this study we suggest a new, systemic way to evaluate extension systems (ESs). Using this model, we compared the effectiveness of ESs in three countries with essential differences but also characteristic similarities in their agricultural sectors: Greece, Italy and Slovenia.

Design/methodology/approach: Initially, we defined ‘extension system’ as a wide range of actors integrating resources with the aim of co-producing value (not for but with) farmers. To capture the value flow within this constellation of actors we distinguished between the notion of ‘value in production’ – i.e. the value embodied in service offerings – and the value emanating when service content is used in real settings or ‘value in use.’

Findings: Our approach revealed that, despite their structural and organizational differences, the ES in the three countries share common problems arising from a limited focus on the issue of value in use.

Practical implications: The application of a systemic approach – seeing farmers as co-creators and not as end-users of extension services – in the evaluation of ESs contributes to better understand the complexity of value flow within the system and can strengthen extension systems’ effectiveness.

Theoretical implications: The present study, by reconsidering traditional evaluation approaches and by focusing on value co-production, offers an alternative value-centric framework for the conceptualization of extension services and points out to the need for refining the evaluation criteria of ESs.

Originality/value: Our work, by emphasizing the reciprocal creation of value within ESs, and by adding the concept of value in use, offers a new systems approach worth considering when evaluating ESs within different organizational and sociocultural contexts.  相似文献   

Media-specific rate allocation in heterogeneous wireless networks     

JURCA Dan  FROSSARD Pascal 《浙江大学学报(A卷英文版)》2006,7(5):713-726

INTRODUCTION With the development of novel wireless tech- nologies and increasing available bandwidth, multi- media applications over wireless networks become attractive for both businesses and end users. Fast de- ployment of Wi-Fi HotSpots, increase in wireless coverage of remote habitable areas (Wi-Max, or wireless mesh networks), improved data services over the 2G cellular systems and the long awaited debut of 3G wireless services offer many potential and inter- operable communicatio…  相似文献   

Teachers’ perceptions of the inclusion of marginalised groups   总被引：1，自引：0，他引：1  

Mojca Peček  Ivan Čuk  Irena Lesar 《Educational studies》2008,34(3):225-239

This paper is based on the concept of inclusion as a process of recognising and minimising the barriers to learning and participation of all children, with teachers as the key players in implementing inclusion in practice. There are two key questions: (1) How do teachers rank different groups of marginalised children? (2) How do teachers see their own role, the role of the marginalised and other children, and their parents in the inclusion process? The groups included in the research were children with special needs, migrants from former Yugoslavia, Roma/Gypsies and children from poor families. In the latter group, it also looked at their counterparts, the children of wealthy parents. Research carried out on a representative sample of primary school teachers in Slovenia showed that children with special needs are among all surveyed groups of children those seen as the most helpless. For these children, teachers are also most likely to lower learning and discipline standards, while at the same time feeling the least qualified to teach them and seeing them also as having the lowest abilities. In the teachers’ opinion, parents of other children have the greatest reservations when their child associates with a Roma/Gypsy child, and teachers also put the least trust in Roma/Gypsy parents.  相似文献   

Educating Art in a Globalizing World. The University of Ideas: A Sociological Case‐study     

Pascal Gielen 《The International Journal of Art & Design Education》2006,25(1):5-15

In 1999, the Italian Arte Povera artist Michelangelo Pistoletto and other artists laid the foundations of The University of Ideas (UNIDEE), an exceptional international artist‐in‐residence programme with a strong ideological foundation. As a sociologist of culture I had the opportunity to do research in the huge organization for a month by doing participant observation, in‐depth interviews and discourse analysis. In this article the educational programme of UNIDEE is interpreted in sociological terms. First of all it will be contextualized in the artistic work of Michelangelo Pistoletto through his concept of the mirror and his a‐modern idea of ‘The Minus Artist’. In the second part Pistoletto's artistic, political and economic movement Cittadellarte, in which UNIDEE is based, will be described. Finally UNIDEE will be analysed as a model for art education on the border of modernity attempting to redefine the position of art and of the artist in a globalizing world.  相似文献   

The effect of potential fall distance on hormonal response in rock climbing     

Jiří Baláš  David Giles  Leona Chrastinová  Kateřina Kárníková  Jan Kodejška  Alžběta Hlaváčková 《Journal of sports sciences》2017,35(10):989-994

The aim of this study was to examine the effect of alterations in potential lead fall distance on the hormonal responses of rock climbers. Nine advanced female climbers completed two routes while clipping all (PRO-all) or half (PRO-½) of the fixed points of protection. Venous blood samples were analysed for total catecholamines, noradrenaline (norepinephrine), adrenaline (epinephrine), dopamine, lactate, cortisol and serotonin. Differences between the two conditions pre, immediately post and 15 min post climbing were assessed using a 2 × 3 repeated measures ANOVA. All hormones and blood lactate concentrations increased significantly (P < 0.05) immediately post climb, except for cortisol. Peak cortisol concentrations did not occur until 15 min post ascent. Further, significant interactions between climbing and clipping conditions were found for total catecholamines (890% of basal concentration in PRO-½ vs. 568% in PRO-all), noradrenaline (794% vs. 532%) and dopamine (500% vs. 210%). There were no significant interactions for adrenaline (1920% vs. 1045%), serotonin (150% vs. 127%) or lactate (329% vs. 279%). The study showed a greater catecholamine response with an increase in potential lead fall distance. The most pronounced increases seen in catecholamine concentration were reported for dopamine and noradrenaline.  相似文献   

THE PARENTS COUNCIL     

Rev. Pascal Harrower M.A. 《Religious education (Chicago, Ill.)》2013,108(1):69-78

The aim of this article is to consider the psychological mechanisms that may prevent individuals from achieving religious tolerance and religious pluralism. After defining these concepts and explaining why they are desirable outcomes, four psychological obstacles to the achievement of religious tolerance and religious pluralism will be explored by considering both research in psychology and the literature on religious education. The aim of identifying these obstacles is to enable us to suggest how they might be overcome through education, and what the implications for religious education are.  相似文献   

The influence of core affect on cyclo-ergometer endurance performance: Effects on performance outcomes and perceived exertion     

Selenia di Fronso  Antonio Aquino  Rka Zsanett Bondr  Cristina Montesano  Claudio Robazza  Maurizio Bertollo 《运动与健康科学(英文)》2020,9(6):578-586

BackgroundCore affect is defined as the most general affective construct consciously accessible that is experienced constantly. It can be experienced as free-floating (mood) or related to prototypical emotional episodes. The aim of this study was to examine the influence of pleasant and unpleasant core affect on cyclo-ergometer endurance performance. Specifically, we considered the influence of pleasant and unpleasant core affect on performance outcomes (i.e., time to task completion) and rate of perceived exertion (RPE; Borg Scale, category ratio-10) collected during the task.MethodsThirty-one participants aged 20–28 years were recruited. Core affect was randomly elicited by 2 sets of pleasant and unpleasant pictures chosen from the international affective picture system. Pictures were displayed to participants during a cyclo-ergometer performance in 2 days in a counterbalanced order. RPE was collected every minute to detect volunteers’ exhaustion.ResultsThe study sample was split into 2 groups. Group 1 comprised participants who performed better with pleasant core affect, whereas Group 2 included participants who performed better with unpleasant core affect. Mixed between-within subjects analysis of variance revealed a significant 2 (group) × 2 (condition) × 5 (isotime) interaction (p = 0.002, η_p² = 0.158). Post hoc comparisons showed that participants who obtained better performance with pleasant core affect (pleasant pictures; Group 1) reported lower RPE values at 75% of time to exhaustion in a pleasant core affect condition compared to an unpleasant core affect condition. On the other hand, participants who obtained better performance with unpleasant core affect (unpleasant pictures; Group 2) reported lower RPE values at 75% and 100% of time to exhaustion in an unpleasant core affect condition.ConclusionFindings suggest differential effects of pleasant and unpleasant core affect on performance. Moreover, core affect was found to influence perceived exertion and performance according to participants’ preferences for pleasant or unpleasant core affect.  相似文献   

Kinematic differences between successful and faulty spikes in young volleyball players     

Javad Sarvestan  Zdeněk Svoboda  Petr Linduška 《Journal of sports sciences》2020,38(20):2314-2320

ABSTRACT

This study was designated to investigate the kinematical differences between successful and faulty spikes, in order to identify the best strategies leading to better spike performance. Simulating a real-game condition, 13 elite youth attackers performed 6 spikes in the presence of 2 blocks. The kinematic variables of the spike performances were recorded using 6 optoelectronic cameras (Vicon Motion systems, Oxford, UK). The paired sample t-test was used to compare the kinematic variables recorded during the delivery of successful and faulty spikes. Among the successful trials, both the angular velocities of the knees (≈12.4%) and hips (≈13.3%), and the vertical velocity of the centre of mass at take-off (≈6.5%) and arm swing (≈8.2%) were considerably higher during the plant phase. Consequently, the jump (≈4.3%) and spike (≈1.5%) heights, as well as the wrist velocity (≈5.5%), were significantly higher during the jump phase of successful spikes. In successful spike performances, the attackers adopted higher hip and knee angular velocities, combined with efficient arm swings, to produce higher take-off velocities and reach higher jump heights. This approach provides them with the better position regarding the ball and the blockers to find the best path and hit the ball with higher arm velocities.  相似文献