Time domain system identification of unknown initial conditions

System identification is a method for using measured data to create or improve a mathematical model of the object being tested. From the measured data however, noise is noticed at the beginning of the response. One solution to avoid this noise problem is to skip the noisy data and then use the initial conditions as active parameters, to be found by using the system identification process. This paper describes the development of the equations for setting up the initial conditions as active parameters. The simulated data and response data from actual shear buildings were used to prove the accuracy of both the algorithm and the computer program, which include the initial conditions as active parameters. The numerical and experimental model analysis showed that the value of mass, stiffness and frequency were very reasonable and that the computed acceleration and measured acceleration matched very well.     

Psychosocial development through Masters sport: What can be gained from youth sport models?

Although sport participation is encouraged throughout the lifespan, little research has been conducted on the role of sport in development later in life. This qualitative study explored adults’ experiences of development within the context of Masters sport. We interviewed 14 adults (nine men and five women) aged 46–61 years involved in Masters sport. Data was interpreted drawing upon frameworks from youth sport (i.e., Personal Assets Framework for Sport; Côté, J., Bruner, M., Strachan, L., Erickson, K., & Fraser-Thomas, J. (2010). Athletes’ development and coaching. In J. Lyle & C. Cushion (Eds.), Sport coaching: Professionalism and practice (pp. 63–83). Oxford, UK: Elsevier, Côté, J., Turnnidge, J., & Evans, M. B. (2014). The dynamic process of development through sport. Kinesiologia Slovenica, 20(3), 14–26, Côté, J., Turnnidge, J., & Vieerima, M. (2016). A personal assets approach to youth sport. In K. Green & A. Smith (Eds.), Routledge handbook of youth sport (pp. 243–255). New York, NY: Routledge; 4/5Cs of positive youth development; Lerner, R. M., Fisher, C. B., & Weinberg, R. A. (2000). Toward a science for and of the people: Promoting civil society through the application of developmental science. Child Development, 71(1), 11–20. doi:10.1111/1467-8624.00113; Vierimaa, M., Erickson, K., Côté, J., & Gilbert, W. (2012). Positive youth development: A measurement framework for sport. International Journal of Sports Science & Coaching, 7(3), 601–614. doi:10.1260/1747-9541.7.3.601), combined with past research on mid-life and older athletes. Six key themes emerged as contributing to adults’ personal development through sport: competence and confidence, character, commitment, connection, cognition, and challenge. Masters sport contexts appeared to facilitate changes in assets (i.e., 6Cs) similar to those within youth sport, but assets often held different meanings within the context of later life. Applying frameworks from youth sport and developmental psychology to Masters sport contexts appears useful. The current findings support the modification of existing models and highlight their potential in identifying lifelong developmental outcomes of sport participation.     

Strength and conditioning

Current information and evidence indicate that for most activities free weight training can produce superior results compared to training with machines, particularly when the free weight training involves complex, multi‐joint exercises. A number of reasons can account for the superiority of free weights; the major factor deals with mechanical specificity. Mechanical specificity is concerned with appropriate movement patterns, force application and velocity of movement. Considering the available evidence that adherence to the concept of specificity of exercise and training can result in a greater transfer of training effect then free weights should produce a more effective training transfer. Therefore, the majority of resistance exercises making up a training programme should include of free weight exercises with emphasis on mechanical specificity (i.e. large muscle mass exercises, appropriate velocity, contraction type etc.). Generally, machines should be used as an adjunct to free weight training and, depending upon the sport, can be used to a greater or lesser extent during various phases of the training period (preparation, pre‐competition, competition).     

Success Is Like True Art

经过层层搏杀步入政界的天之骄子、在商界白手起家的财富精英、在奥运会上争金夺银的运动健儿、在演艺界拥有粉丝无数的俊男靓女或者实力派艺人……他们用一种无人能敌的大气魄展示了成功的含义,并继续描绘着一个令我们普通大众望尘莫及的梦。到底怎样才算成功?我们也许有些迷茫,或许还会故作沧桑。不要垂头丧气,成功其实就在不远的前方。听听普通的过来人对于成功的看法吧,希望能给你的人生带来一种实用性的指导。     

ChinaJoy携手世博开大会！

本文将告诉你定制自己的上网导航页,让上网更加轻松。     

Instructional Design Rules for Algorithmic Subject Matter

Algorithms are essential to computer programming because of their structure and precision. These same characteristics could also be used in the field of instructional technology, but usually aren't because they are viewed as being too complex. This article attempts to clarify their utility by first analyzing the structural and processing characteristics of algorithms. Simple examples are used to illustrate how the design process is influenced by these characteristics. Five instructional design guidelines, or rules, are then presented and discussed. The rules are derived from empirical examinations of algorithm-based learning and conform to the limitations dictated by several information processing principles.