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Milena Z. Zivkovic Sasa Djuric Ivan Cuk Dejan Suzovic 《Journal of sports sciences》2017,35(13):1287-1293
A range of force (F) and velocity (V) data obtained from functional movement tasks (e.g., running, jumping, throwing, lifting, cycling) performed under variety of external loads have typically revealed strong and approximately linear F–V relationships. The regression model parameters reveal the maximum F (F-intercept), V (V-intercept), and power (P) producing capacities of the tested muscles. The aim of the present study was to evaluate the level of agreement between the routinely used “multiple-load model” and a simple “two-load model” based on direct assessment of the F–V relationship from only 2 external loads applied. Twelve participants were tested on the maximum performance vertical jumps, cycling, bench press throws, and bench pull performed against a variety of different loads. All 4 tested tasks revealed both exceptionally strong relationships between the parameters of the 2 models (median R = 0.98) and a lack of meaningful differences between their magnitudes (fixed bias below 3.4%). Therefore, addition of another load to the standard tests of various functional tasks typically conducted under a single set of mechanical conditions could allow for the assessment of the muscle mechanical properties such as the muscle F, V, and P producing capacities. 相似文献
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Jelena Teodorović Dejan Stanković Bojana Bodroža Vladeta Milin Ivana Đerić 《Educational Assessment, Evaluation and Accountability》2016,28(4):347-375
Numerous educational reforms have been initiated in Serbia since 2000. The aim of this study was to examine education policymaking in Serbia in order to provide policymakers and stakeholders with recommendations on how to minimize pitfalls and increase success of future educational endeavors. In the study, we utilized the education policy cycle heuristic to analyze formation, implementation, and evaluation of three major education policies in Serbia: in-service training of teachers (INSET), school development planning (SDP), and inclusive education (IE). Examining three reforms simultaneously enabled us to identify major characteristics of Serbian policymaking, regardless of the reform content. We also relied on educational change literature, so that we could assess complex contexts of reforms. Finally, considering the importance of school staff during implementation, we examined education policymaking in Serbia through the eyes of over 1,800 teachers, counselors, and principals. The results point out to dissatisfaction of school staff with all aspects of the policymaking in Serbia and with the social and education context. Reforms appear to be undertaken in a similar pattern across different reforms. The findings imply that a thorough examination of both the policymaking in Serbia and communication, organization, and administration within the education system itself is in order. 相似文献
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Dejan?Mati? Sladjana?CabriloEmail author Leposava?Grubi?-Ne?i? Bojana?Mili? 《知识管理研究与实践》2017,15(3):431-446
This paper presents a research model aimed to investigate the impact of organizational climate, motivational drivers, and empowering leadership on behavioral intention formation in knowledge sharing. A research model has been developed by integrating several knowledge management studies having in-focus behavioral intention formation in knowledge sharing. The hypotheses are tested on data collected from 873 employees from public and private sector organizations from Serbia’s province of Vojvodina, using partial least square structural modeling technique and SmartPLS software. Findings suggest that organizational climate with prominent dimensions of fairness, innovativeness and affiliation, empowering leadership, sense of self-worth, and altruism significantly influence individuals’ knowledge-sharing attitude, intention, and behavior thus confirming the theory of reasoned action. Results obtained in this research expand and deepen findings reported in previous studies and enable a comprehensive framework for understanding the influence of some organizational variables on employees’ tendencies to be engaged in knowledge sharing. 相似文献
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Today’s software industry requires individuals who are proficient in as many programming languages as possible. Structured query language (SQL), as an adopted standard, is no exception, as it is the most widely used query language to retrieve and manipulate data. However, the process of learning SQL turns out to be challenging. The need for a computer-aided solution to help users learn SQL and improve their proficiency is vital. In this study, we present a new approach to help users conceptualize basic building blocks of the language faster and more efficiently. The adaptive design of the proposed approach aids users in learning SQL by supporting their own path to the solution and employing successful previous attempts, while not enforcing the ideal solution provided by the instructor. Furthermore, we perform an empirical evaluation with 93 participants and demonstrate that the employment of hints is successful, being especially beneficial for users with lower prior knowledge. 相似文献
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Dejan Reljic Joachim Jost Kirsten Dickau Ralf Kinscherf Gabriel Bonaterra Birgit Friedmann-Bette 《Journal of sports sciences》2015,33(5):437-448
Dietary intake, vitamin status and oxidative stress were evaluated in 17 elite male boxers. Ten of them frequently reduced body weight rapidly before competitions (Weight Loss Group) and 7 did not practice rapid weight loss (Control Group). Food record checklists, blood samples for determination of vitamin status and plasma glutathione levels were obtained during a week of weight maintenance, a pre-competition week and a post-competition week. The average dietary intakes in both groups were 33 ± 8 kcal·kg?1, 3.7 ± 1.1 g·kg?1 carbohydrates, 1.5 ± 0.4 g·kg?1 protein, 1.2 ± 0.4 g·kg?1 fat and 2.2 ± 1.0 L water per day (excluding pre-competition week in Weight Loss Group). Energy (18 ± 7 kcal·kg?1), carbohydrate (2.2 ± 0.8 g·kg?1), protein (0.8 ± 0.4 g·kg?1), fat (0.6 ± 0.3 g·kg?1) and water (1.6 ± 0.6 L) consumption (P-values <0.001) and intakes of most vitamins (P-values < 0.05) were significantly reduced during the pre-competition week in the Weight Loss Group. In both groups, the intakes of vitamins A, E and folate were below recommended values throughout the three periods; however, blood vitamin and plasma glutathione levels did not change significantly. Our findings indicate a low-caloric and low-carbohydrate diet in elite boxers, regardless of participating in rapid weight loss or not. Apparently, the pre-competitional malnutitrition in the Weight Loss Group did not induce alterations in the vitamin and glutathione status. 相似文献
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