• 디지털융복합연구
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• 제20권1호
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• pp.361-368
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• 2022

이 연구에서는 새롭게 Asian Working Group for Sarcopenia에서 제시한 수정된 근감소증 진단 cut-off value를 이용하여 정상 집단과 근력이 저하된 possible sarcopenia(PS) 집단을 구분하였다. 국민건강영양조사 제 7기 자료를 토대로, 집단간 신체적 특성의 차이와 삶의 질, 유·무산소 운동 실천에 따른 교차비를 산출하였다. 대상자는 20세-80세까지를 포함하였다. 집단간 차이는 복합표본 독립 t-test와 logistic 회귀분석을 통해 확인하였다. 그 결과는 PS 집단은 나이가 더 많았으며, 신장, 체중, 체질량지수가 모두 낮았다. 허리둘레는 남성 PS 집단이 유의하게 낮았으나, 여성 PS 집단이 유의하게 높았다. 삶의 질의 영역 중 운동 능력에서 일상활동에 지장이 있는 경우가 남성에서는 8.28배, 여성에서는 15.52배 높았다. 유산소 운동의 실천 여부도 PS 집단에서 남녀 각각 19%, 26% 더 낮았으며, 근력 운동실천 여부도 남녀 각각 52%, 43% 더 낮았다.

• 상하수도학회지
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• 제21권4호
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• pp.409-420
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• 2007

ASM No. 1 is a very useful model to analyze wastewater treatment system removing organic carbon and nitrogen material. But it isn't adequate to control the wastewater treatment system with real time since it has many material divisions and parameters. So, the purpose of this study is the simplification of ASM No. 1 to control the wastewater treatment system. ASM No. 1 was changed with the model which has 3 material divisions(COD, $NH_4{^+}$, $NO_3{^-}$) and two phases(Aerobic and Anoxic condition). SBR was running with two phases(Phase I and II). Phase II running 20 minutes with aerobic time was used for deciding model parameters and Phase I running 12 minutes with aerobic time was used for proving the simplified model. The simplified model was compared with ASM No. 1 using data of Phase I and II. As a result of model comparison, the simplified model has enough ability to express the variation of $NH_4{^+}$ compound.

• 한국환경보건학회지
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• 제27권1호
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• pp.112-118
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• 2001

The aim of this study was to evaluate on the removal effect of total nitrogen and phosphorus in municipal wastewater with temperature change from 1$0^{\circ}C$ to 24$^{\circ}C$ in CNR(Cilia Nutrient Removal) process. CNR process is the process combining $A^2$/O process with cilium media of H2L company. The removal efficiencies for T-N were found to be 57.9% at 1$0^{\circ}C$ below, 53.7% at 10-2$0^{\circ}C$, 52.2%at 20-24$^{\circ}C$ and 44.4% over 24$^{\circ}C$ respectively. The removal efficiencies for T-P were 53.3% at 1$0^{\circ}C$ below, 59.1% at 10-2$0^{\circ}C$, 72.4% at 20-24$^{\circ}C$ and 50.0% over 24$^{\circ}C$ respectively. The specific nitrification rate (kg NH$_3$-N/kg MLSS.d) of Oxic basin was 0.088 and 0.053 at 1$0^{\circ}C$ below, 0.077 at 10-2$0^{\circ}C$, 0.097 at 20-24$^{\circ}C$ and 0.088 over 24$^{\circ}C$ respectively. The specific denitrification rate (kg NH$_3$-N/kg MLSS.d) in anaerobic and anoxic was 0.013, 0.008 respectively.

• KSBB Journal
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• 제14권5호
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• pp.616-620
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• 1999

Winogradsky column을 이용하여 10개의 탈질 박테리아를 분리하였다. 그 중 가장 성능이 우수한 탈질 박테리아를 Pseudomonas CW4로 명하였다. Pseudomonas CW4는 무산소 조건에서 배양하였고, Pseudomonas CW4의 최적 생육조건을 온도, pH. 교반속도, 탄소원 농도 및 질산성질소 농도에 변화를 주어 측정하였다. 최적 생육 온도 3$0^{\circ}C$, 최적 pH 범위는 6~8이었다. 교반속도와 탄소원 농도에 대한 영향은 아주 작았다. 그리고 질산성 질소의 초기농도 142.5 mg/L 에서 15 시간만에 100% 탈질을 나타내었다.

• 상하수도학회지
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• 제22권1호
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• pp.3-14
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• 2008

ASM No. 2(Activated sludge model No. 2) is very useful model to analyze the wastewater treatment which removes nitrogen and phosphorus. But, it is difficult to apply ASM No. 2 to control of wastewater treatment since it has 17 material divisions and 46 parameters. So the purpose of this study was the simplification of ASM No. 2 and the provement of simplification model. Firstly ASM No. 2 was simplified with 5 material division and three phases(Anaerobic, aerobic, anoxic phases). The simplified model was proved by R-square using track study data. As a result of provement, the values of R-square in ${NH_4}^+$ were 0.9815 in ASM No. 2 and 0.9250 in simplified model and in ${NO_3}^-$ were 0.8679 in ASM No. 2 and 0.7914 in simplified model and in ${PO_4}^{3-}$ are 0.9745 in ASM No. 2 and 0.9187 in the simplified model when the ability to express the material variation was compared by R-square. So, the simplified model has enough ability to express the variation of ${NH_4}^+$, ${NO_3}^-$ and ${PO_4}^{3-}$.

• 상하수도학회지
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• 제32권1호
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• pp.19-25
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• 2018

The objectives of this study were to evaluate the removal characteristics of total nitrogen, the influence factor of denitrification and the optimum operating condition in the pigment wastewater treatment using PAC-A/O process. The operating conditions of PAC-A/O process were mean BOD volumetric loading $0.86kgBOD/m^3/day$, mean F/M ratio 0.072~0.13 kgBOD/kgMLVSS/day and mean C/N ratio 3.47, respectively. The conditions of anoxic process in the field plant test were mean pH 8.3~8.7 and mean temperature $34.1{\sim}44.0^{\circ}C$. The ORP bending point knee was eventually appeared in the ORP -107 mV and $NO_3{^-}-N$ removal efficiency was increased according to the ORP decrease. In the ORP -107 mV below condition, the removal efficiency of T-N and $NO_3{^-}-N$ was 92.3~95.0% and 98.5~99.7%. Denitrification rate was calculated to be 1.581~1.791 mg $NO_3{^-}-N/gMLSS/hr$. The experimental results showed that the ORP control in the PAC-A/O process could be an effective method for treatment of pigment wastewater.

• 한국인터넷방송통신학회논문지
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• 제14권6호
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• pp.125-130
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• 2014

최근 정보통신 및 IT기기의 발달과 이를 활용한 IT 융합문화가 급속히 발전하고 있다. 이로 인한 정보기기의 과사용으로 과거의 아이들에 비해 요즘 아이들의 운동량이 상대적으로 줄어듦에 따라 신체건강의 문제가 대두되고 있어 이를 해결하기 위한 연구가 필요한 시점이다. 본 연구는 아동의 건강 개선을 위한 연구로 PC, 스마트폰 중독에 빠져 신체운동이 부족해지기 쉬운 아동이 집에서 Kinect를 활용하여 간단히 할 수 있는 유/무산소 운동을 제안하고 아동 혼자 운동하는 지루함을 잊게함과 동시에 옆에서 누군가 코치(케어)해 줄 수 있는, 아동을 위한 스포츠 코칭 어플리케이션 개발을 목적으로 한다.

• 한국인터넷방송통신학회논문지
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• 제13권6호
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• pp.237-242
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• 2013

헬스장을 이용하고는 싶지만 과한 업무량과 지리적 위치, 시간 등 여러 가지 이유로 이용에 제한이 있다. 그래서 집에서 간단히 할 수 있는 유/무산소 운동을 즐기되, 혼자 하는 지루함을 잊게 하고 옆에서 누군가 코치(케어)해 줄 수 있는가에 대한 발상에 힘입어 헬스케어 어플리케이션 개발에 착수하게 되었다. 본 연구는 인터넷/매장에서 쉽게 접할 수 있는 MicroSoft Kinect 하드웨어를 사용하였고 키넥트를 이용 사용자를 인식하고, 3D 모델을 모델링하여 인식된 사용자와 맵핑시켜 동작을 컨트롤하고 몸무게, 칼로리를 케어하는 프로그램을 구현하였다.

• 한국환경보건학회지
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• 제43권6호
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• pp.525-531
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• 2017

Objectives: The purpose of this experiment is to better understand the nitrogen and phosphorus removal ratio according to operating conditions in an iron electrolysis system consisting of an anoxic basin, aerobic basin, and iron precipitation apparatus. Methods: Iron electrolysis consists of an iron precipitation reactor composed of iron plates in oxic and anoxic basins. We studied the interrelation coefficient between T-N and T-P removal rates and F/M ratio, and the C/N ratio and BOD removal rate. Results: The F/M ratio and the T-N and T-P removal rate per unit area have interrelation coefficients of 0.362 and 0.603, respectively. The removal rate per MLVSS and the T-N and T-P removal rate per unit area have respective interrelation coefficients of 0.49 and 0.59. Conclusions: The removal rate of T-N and T-P increased with the increasing F/M ratio in the influent, and they also linearly increased in proportion to the C/N ratio of influent and BOD removal rate of the reactor.

• 한국환경과학회지
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• 제11권12호
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• pp.1261-1265
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• 2002

This study was focused on the investigation of the characteristics of organics and nitrogen removal with the recycle ratio in anoxic/oxic(A/O) packed bed process that consisted of the anoxic reactor and the aerobic reactor. As increasing the recycle ratio by 0.5, 1.0, 2.0, the COD removal efficiency increased by 94.0%, 98.5%, 98.8% respectively. The aerobic reactor showed the perfect nitrification efficiency by 98.5%, 99.2%, 98.0% respectively. The T-N removal efficiency with the recycle ratio, increased by 56%, 67%, 70% respectively. As increasing the recycle ratio by 0.5, 1.0, 2.0, T-P removal efficiency decreased by 62.1%, 57.4%, 51.3% respectively. The process by releasing the stored phosphorus in the anoxic reactor and uptaking the excess phosphorus in the aerobic reactor, occurred well comparatively when recycle ratio is 0.5. But this process did not occur when the recycle ratio is 1.0 and 2.0. And optimum pH of nitrification was about 6~7 and alkalinity decreased as nitrification rate increased. As increasing the recycle ratio in the anoxic reactor, DO concentration and ORP increased.