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초음파 (US)와 다양한 파장범위의 자외선 (UV) 조사에 따른 DEP 분해특성에 관한 연구
나승민 ( Seung Min Na ),( Jin Hua Cai ),신동훈 ( Dong Hoon Shin ),( Ming Can Cui ),김지형 ( Jee Hyeong Khim ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.7
Diethyl phthalate (DEP) is widely spread in the natural environment as an endocrine disruption chemicals (EDs). Therefore, in this study, ultrasound (US) and ultraviolet (UVC), including various applied power density (10-40 W/L), UV wavelengths (365 nm, 254 nm and 185 nm) and frequencies (283 kHz, 935 kHz) were applied to a DEP contaminated solution. The pseudo-first order degradation rate constants were in the order of 10-1 to 10-4 min-1 depending on the processes. Photolytic and sonophotolytic DEP degradation rate also were high at shortest UV wavelength (VUV) due to the higher energy of photons, higher molar absorption coefficient of DEP and increased hydroxyl radical generation from homolysis of water. Sonolytic DEP degradation rate increased with increase of applied input power and the dominant reaction mechanism of DEP in sonolysis was estimated as hydroxyl radical reaction by the addition of t-BuOH, which is a common hydroxyl radical scavenger. Moreover, synergistic effect of were also observed for sonophotolytic degradation with various UV irradiation.
파 에너지 (자외선, 초음파)/과황산나트륨을 이용한 이부프로펜 분해특성 연구
나승민 ( Seung Min Na ),안윤경 ( Yungyong Ahn ),손영규 ( Ming Can Cui ),김지형 ( Young Gu Son ),( Jeeh Yeong Kim ) 한국환경과학회 2014 한국환경과학회지 Vol.23 No.5
In this study, ibuprofen(IBP) degradation by the photochemical (UV/S2O82-) and sonochemical (US/S2O82-) processes was examined under various parameters, such as UV (10~40±5 W/L) and US (50~90±5 W/L) power density, optimum dosage of persulfate ion (S2O82-), temperature (20~60℃) and anions effect (Cl-, HCO3-, CO32-). The pseudo?first?order degradation rate constants were in the order of 10-1 to 10-5 min-1 depending on each processes. The synergistic effect of IBP degradation in UV/S2O82- and US/S2O82- processes could investigated, due to the generation of SO4- radical. This result can confirm from the produced H2O2 and SO42- concentration in each processes. IBP degradation rate affected by the S2O82- dosage, temperature, power and anion existence parameters. In particular, IBP degradation rate increased with the increase of the temperature (60℃) and applied power density (UV:40±5 W/L, US:90±5 W/L). On the other hand, anions effect on the IBP degradation was negative, due to the anion play as a the scavenger of radical.
청소년 비만관리를 위한 모바일 서비스 개발 및 사용자 평가방법 설계
나승민(Seungmin Na),박인화(In-Hwa Park),김해나(Hae-Na Kim) 한국HCI학회 2014 한국HCI학회 학술대회 Vol.2014 No.12
최근 국내 청소년의 비만율이 급증하면서 사회적인 문제로 대두되고 있으며 예방과 치료에 대한 필요성이 강조되고 있다. 비만 청소년은 같은 또래보다 자아 존중감이 떨어지고, 우울감 및 불안감 등과 같은 정서적 문제를 일으킨다. 더불어 성인 비만으로 이어질 가능성이 높아 각종 성인병을 유발할 수 있다. 본 연구에서는 위와 같은 문제를 해결하고자 스마트 디바이스를 이용한 청소년 비만관리 서비스를 개발하였다. 또한 서비스의 사용자 평가항목을 정의하고, 데이터를 분석하여 청소년의 비만 문제해결에 어떠한 영향을 줄 것인지 알아보고자 한다. Obesity of youth have been increasing in number recently so it has emerged as a social issue. It is emphasized a need for the prevention and treatment. Youth with obesity has a low self-esteem than similar age and causes emotional problems such as depression and anxiety. Moreover there is high probability of that lead to adult obesity which can cause various adult diseases. In this study, we develop the smart devices service for obesity management in youth to solve this social problem. Also we evaluate how the service influence on obesity problem solution of youth to analyze user assessment items of service.