In this paper, we describe how intrinsic motivation, extrinsic motivation, and the willingness to take risks influence the activity of Facebook and iPhone application developers. Both Facebook and Apple utilise a platform business model but differ in terms of their openness towards external development. However, in any platform business model, a platform owner must encourage peripheral contribu...

the focus of this paper is to evaluate the influence of mechanical characteristics of the implant on primary stability in different bone types, based on resonance frequency analysis (rfa).a number of 60 nobel biocare replace select tiunit tapered implants of two different lengths (10 mm and 13 mm) and three different widths as 3.4 mm (narrow platform (np)), 4.3 mm (regular platform (rp)) and 5 ...

in this paper an optimal controller is proposed for a self-balancing electrical vehicle called segway pt. this vehicle has one platform and two wheels on the sides and the rider stands on the platform. a handlebar, as a navigator, is attached to the body of segway, with which the rider controls the vehicle. since segway uses electrical energy produced by batteries, resource consumption manageme...

although many scholars had proposed lots research results about online shopping, they are quite vague and hard for enterprisers to practice it. hence, this research observes the online store policies, services, functions, and activities among 17 online shopping platforms in taiwan, china, and hong kong. and, this research (1) finds online stores assessment items by literature review; (2) establ...

Social media platforms shape our lives on micro, meso and macro levels. They have transformed everyday practices as individuals, or social small large groups, multiple, entangled impacts rituals of democracy cultural (re)production, organization labor industry. This panel brings together five papers, each by authors recently published forthcoming platform books. Together, the papers offer an an...

background and aims. in contrast to prepared natural dentin abutments, little is known concerning factors influencing the retention of fixed prostheses cemented to implant abutments. the aim of this study was to investigate the effect of implant abutment height on the retention of single castings cemented to wide and narrow platform implant abutments. materials and methods. thirty-six parallel-...

Introduction: There are several evidences that show various environmental stresses during pregnancy, affect physiological behavior of the offspring. In this study the effects of REM (Rapid Eye Movement) sleep deprivation of pregnant rats on spatial learning of adult male offspring by Morris water maze were investigated. Methods: Water tank technique was used for inducing REM sleep deprivatio...

Proprioception is essential for joint function and through which individual can detect body parts movement in space. Aim of present study is to investigate effect of balance training on unstable platform with tilting, translation and combined motion on knee joint position sense in active young males. 39 healthy active male divided in to three training and control (n=9) groups. Training on unsta...

Previous studies have shown that caffeine has beneficial effects on cognitive impairment in sleep deprived male rats. Therefore in the present study, we examined the effects of chronic caffeine administration on learning and memory impairments induced by sleep deprivation (SD) in the intact and ovarectomized (OVX) female rats. Two sets of animals including intact and OVX were randomly recruited...