Since the advent of smart phones in 2007, the population of smart phone user has been increasing at stunning rate in Korea. In spite of many benefits such as full internet access, location based service, and easy installation of new applications, many social and medical researches have been reported the concern of overuse of smart phones, especially for teenagers on game and internet addiction. However, most of studies are based on the survey research, so often questioned to be limited number of sample and subjective, which can be overcome by evident-based study. The paper presents a pilot development of Google Android app that provides the 24-hour-measured application usage pattern of smart phone users. A requirement study performed with medical doctors and phycologists are discussed and the key technical and application issues are discussed and their solutions are presented. The system is designed to be extensible so that social network and additional service can be applied based on the user. The measured data is expected to be used for study the cause and treatment of game and internet addiction for teenagers and adults.

Carbonaceous material prepared from oriental cherry can be used for the adsorption of zinc ion from an aqueous solution. Parameters such as pH (4-11), temperature (293-333 K), mixing intensity (10-120 rpm) and contact time (0.5- 90 min) were studied. Increasing pH (99.6% at pH 11) and temperature (99.8% at 333 K) caused an increase in adsorption capacity. A pseudo-equilibrium state was reached within 1 min of contact time. Removal efficiency of zinc ion remained constant regardless of mixing intensity. The adsorption equilibrium data were best represented by the Freundlich adsorption isotherm. The calculated maximum adsorption capacity was 3.541 mg/g. Thermodynamic studies demonstrated that the adsorption process was spontaneous with Gibb’s free-energy values ranging between -3.272 and -15.594 kJ/mol and endothermic with an enthalpy value of 86.984 kJ/mol. Therefore, carbonaceous material from oriental cherry was shown to have good potential for the adsorption of zinc ion.