Search

The purpose of this study was to evaluate oral health status using oral health index in the elderly population and determine methods for improving oral health status.The date collected from ‘The fifth korean national health and nutrition examination survey 2010’ was analyzed in this study. The subjects included in this study were 712 elderly people, aged 65 years or older and who had completed the oral examination, health questionnaires and nutrition examination. Statistical analysis was done using the SPSS 19.0 for Windows. We determined Frequency analysis and multiple regression analysis.General characteristics and oral health behaviors showed differences in number of teeth associated with as male, the lower age, as dong, the higher education level, the lower smoking, the more use oral health goods, in DMFT associated with the lower age, the lower income level, the higher education level, in FS-T associated with as female, the higher income level, the more use brushing, in T-Health associated with as male, the lower age, as dong, the lower smoking, the more use oral health goods, in CPI associated with as male, the lower age, as dong, the lower smoking, the more use oral health goods. In conclusion, oral health behavior have effect on oral health index, in order to improve the quality of life and promote oral health of the elderly, oral health education system should be organized. Local governments should be supported active and various oral health program for the elderly.

The purpose of this study is to investigate how the ignition spark timing conversion influences the engine performance of LPG/Gasoline Bi-Fuel engine. We propose the control system which can advance the ignition spark timing in LPG fuel mode more than used in gasoline fuel mode. In order to investigate the engine performance during combustion, engine performance are sampled by data acquisition system, for example cylinder pressure, pressure rise rate and heat release rate, while change of the rpm(1500, 2000) and the ignition timing advance(5°,10°,15°,20°) As the result, between 1500rpm and 2000rpm, the cylinder pressure and pressure rise rate was increased when the spark ignition was advanced but pressure rise rate at 20° was smaller value. Also, the heat release rate at 1500rpm was increased but it was lower around 20° at 2000rpm. Key Words : LPG(Liquefied Petroleum Gas), Bi-Fuel Engine, Ignition Timing Advance, Cylinder Pressure, Pressure Rise Rate, Heat Release Rate * 교신저자 : 박명호(parkmh@kangwon.ac.kr)접수일 09년 01월 06일 수정일 (1차 09년 05월 07일, 1차 09년 06월 10일, 3차 09년 07월 16일) 게재확정일 09년 07월 22일