RELIABILITY OF WALKING SPEED, STRIDE TIME AND STRIDE LENGTH VARIABILITY USING FEEDBACK-CONTROLLED TREADMILL

The purpose of this study was to evaluate the test-retest reliability of walking speed, stride time and stride length variability using a feedback-controlled treadmill. Ten subjects performed 3 trials of walking experiment for 5 min with a feedback-controlled treadmill. To check the reliability of gait parameters such as walking speed, average and variability (i.e. coefficient of variance, CV) of stride time and stride length, those parameters were compared in this study. Results showed that all gait variables were confirmed the reliability within-trial (walking speed: intra-class correlation, ICC=0.996, standard error of measurement, SEM=0.03, average stride time: ICC=0.989, SEM=0.01, stride time variability: ICC=0.680, SEM=0.18, average stride length: ICC=9.994, SEM=0.01, stride length variability: ICC=0.830, SEM=0.25). This feedback-controlled treadmill can be used for various gait dynamics study using spatio-temporal variables

Evaluation on Recovery of Glass and Plastics from Compact Fluorescent Lamps (CFLs) by Air Separation Unit

Compact Fluorescent Lamps (CFLs) are composed of glass, plastic, non-ferrous metal, ferrous metal, paper, plastic, rubber, and so on. In order to separate glass and plastic among CFLs components, air separation unit is applied using the difference in specific gravity. Since specific gravities of glass, plastic, non-ferrous metals, rubber, etc. were widely spread, it can be separated by the different specific gravity between 0.40 and 4.36. In air separation unit, particle size and air speed are controlled to recover glass and plastics among the components of CFLs. In other words, it can be removed paper and vinyl to recover glass and plastics. The specific gravities of paper and vinyl in CFLs are 0.45 and 0.88, respectively. And the specific gravities of glass and plastics are almost similar to be 2.2 - 2.6. In air separation unit, the used particle size of the components from CFLs is less than 6 mm. Since phosphor powder and ferrous metals are recovered prior to the air separation unit, the components are not involved those materials. By utilizing a vertical and zigzag type of air separation unit, thereafter, recovery of glass and plastics is estimated with changing air speed. As the air speed increased from 3.08 m/s to 6.75 m/s, separation efficiency of glass and plastics increased from 42.0% to 99.3%. Due to the experimental results of air separation unit, it can find that paper and vinyl from the components of CFLs be efficiently removed by the air separation unit

A Study to Verify the Practicality of Introducing an Arson Dog (K-9) Unit in Field Investigations

Combustion improvers are often found in acts of arson. Until recently, in fire investigations in Korea, these substances have been identified only by the olfactory sense of the fire inspectors or conventional gas detectors. These methods are neither efficient nor feasible in damaged buildings or large areas. Research on the canine sense of smell has shown that a dog can distinguish the remains of combusted hydrocarbon compounds, even in a large, open area. Field tests confirmed that arson dogs can find combustion improvers at fire sites in about five to 77 s. Therefore, this study verified the practicality of introducing arson dog units in field investigations of fire sites to identify combustion improvers sprayed for committing arson

Fuzzy Study on the Winning Rate of Football Game Betting

This study aims to find variables that affect the winning rate of the football team before a match. Qualitative variables such as venue, match importance, performance, and atmosphere of both teams are suggested to predict the outcome. Regression analysis is used to select proper variables. In this study, the performance of the football team is based on the opinions of experts, and the team atmosphere can be calculated with the results of the previous five games. ELO rating represents the state of the opponent. Also, the selected qualitative variables are expressed in fuzzy numbers using fuzzy partitions. A fuzzy regression model for the winning rate of the football team can be estimated by using the least squares method and the least absolute method. It is concluded that the stadium environment, ELO rating, team performance, and importance of the match have effects on the winning rate of Korean National Football (KNF) team from the data on 118 matches

A Study of the Business Model of Tencent Group

With the development of information technology, Many Internet enterprises have emerged rapidly, and to thrive in the face of fierce competition, it is vital for them to have efficient business models. These business models are a popular focus of research interest. At present, there is still no unified interpretation of the business model system of Internet enterprises. The existing theoretical research examines mainly individual enterprises; there are only a very few studies on the business models of platform enterprises. This study therefore aims to summarize the literature on the basis of existing theories combined with the enterprise reality, through a literature review and case study of the Tencent group of companies in China. This study explores the online trading platform for enterprises and its business model.It is instructive to correctly analyze the Internet business model of enterprises in the third party service platform enterprises