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이영내(Lee, Young-Nae),주철안(Joo chulan) 한국교육행정학회 2015 敎育行政學硏究 Vol.33 No.4
본 연구는 분산적 지도성의 관점에서 보건교사의 지도성에 대한 경험과 의미를 9명의 연구 참여자에 대한 심층 면담을 통하여 수행하였다. 원 자료로부터 의미 있는 진술은 약 33개였 으며, 교사지도성의 지도성 경험과 의미는 5개의 범주와 13개의 주제묶음, 25개의 주제로 분 석되었다. 보건교사에게 지도성의 경험과 의미는 범주별로는 더 많이 요구되는 것, 잠재되어 있는 것, 발휘하고 싶은 것, 역할 확대를 요구하는 것, 성취감을 주는 것이었다. 주제묶음으로 는 꼭 필요한 것, 수고롭고 힘든 것, 감춰져 온 것, 소극적으로 표현되는 것, 의료전문성을 살 리는 것, 수업 잘하는 것, 학생지도 잘하는 것, 소통 잘하는 것, 보직 활동 하는 것, 변화를 주도하는 것, 경험을 공유하는 것, 활력소 제공 수단, 자아실현 수단, 감동 같은 것으로 표현 되었다. 이는 보건교사가 학교 현장에서 교사로서의 지도성, 특히 분산적 지도성을 발휘하고 있음을 시사한다. This study has been conducted by in-depth interview on nine participants, which focuses leadership experience and meaning of health teachers in the perspective of distributed leadership. There were about 33 meaningful statements derived from original text. Leadership experience and meaning of health teachers were analyzed in five categories, thirteen groups of themes, and twenty five subjects. The five categories were what was required more, what was potential, what was to be exerted, what required expanding the role, and what provided a sense of achievement. The groups of themes were what was necessary, what was demanding and difficult, what was hidden, what was passively expressed, what was realized in medical professionalism, what was related to well-structured lecture, what was connected to well-instruction for students, what was related to well communication, what was to serve an assigned position, what led the changes, what shared experience, means of providing a source of vigor and self-realization, and touching events. This implies that health teachers take leadership, especially distributed leadership in the field of schools.
선박용 고도수처리장치에서 MBR 복합 적용에 따른 SBR 공법의 침전공정 제어를 통한 평가
최영익 ( Young-ik Choi ),윤영내 ( Young-nae Yoon ),서민성 ( Min-seong Seo ),이슬기 ( Seul-kee Lee ),한영립 ( Young-rip Han ),성낙창 ( Nak-chang Sung ),정진희 ( Jin-hee Jung ) 한국환경기술학회 2015 한국환경기술학회지 Vol.16 No.5
본 연구는 국제해사기구(IMO)에서 채택한 MEPC. 227(64)의 기준에 부합하는 선박용 오수처리장치를 개발함에 있어 SBR 공법을 적용한 고도수처리장치에 MBR 복합 적용에 따른 SBR 반응조 침전시간 제거 가능성을 평가하는 것에 그 목적이 있다. 이를 위해 실험 중 10분 간격으로 DO를 측정하였으며 최종 유출수의 T-N 농도를 측정하여 유입수 대비 유출수의 제거율을 구하였다. 원수는 실험을 위해 제작된 화장실에서 배출된 오수를 이용하였으며 SBR 반응조의 경우 폭기 360분, 교반 120분으로 진행되었으며 침전시간은 생략하였다. 반응조의 MLSS 농도는 3,500 mg/L 이고, 폭기량은 121 L/min이며 생산수량은 1.2 L/min으로 진행되었다. 실험 결과 DO는 폭기 상태에서 최대 4.33 mg/L, 교반 중 무산소 상태에서 0.27 mg/L로 나타났으며 T-N의 유입수 대비 유출수 평균 제거율은 71.78%로 나타났다. 이는 MEPC. 227(64)의 기준(70% 제거율)을 달성한 것으로, 따라서 SBR 공법에서 MBR을 복합 적용 시 SBR 반응조의 침전시간을 제거하는 것이 가능하다고 판단된다. The objective of this study was evaluation of possibility for deleting sedimentation at an advanced wastewater treatment plant for shipboard that can satisfy the standards of IMO MEPC. 227(64). DO was measured at 10 minute intervals during the experiment and removal efficiency was determined by measuring the T-N concentration in the effluent water. Raw water was supplied from the toilet built for experiment. SBR process was conducted with aeration 360 mins, mixing 120 mins and settling period was omitted. This experiment was conducted with MLSS concentration, 3,500 mg/L, amount of air supplied 121 L/min and intake treated water 1.2 L/min. Average of DO in the aeration period and in the anoxic period were 4.33 mg/L and 0.17 mg/L respectively. And average removal efficiency of T-N is 71.78%. This research can achieve the MEPC. 227(64). Therefore, it is possible to delete sedimentation process in SBR reactor when SBR process is connected with MBR process.
Bench-scale 선박용 고도수처리장치에서의 T-N 제거효율 연구
최영익 ( Young-ik Choi ),신대열 ( Dae-yeol Shin ),이승철 ( Seung-chul Lee ),정진희 ( Jin-hee Jung ),윤영내 ( Young-nae Yoon ) 한국환경과학회 2018 한국환경과학회지 Vol.27 No.1
In this study, the International Maritime Organization (IMO)’s guideline MEPC. 277 (64) was developed and evaluated for the removal efficiency of T-N in a SBR and MBR combined process. This combined process of resized equipment based on large capacity water treatment device for a protection of marine aquatic life. In this experiment, T-N concentration of influent and effluent was measured through with the artificial wastewater. The SBR reactor operation time was varied according to the C : N : P ratios so that different conditions for mixing and aeration period in mins (90 : 60, 80 : 40, 70 : 50) and two C: N: P ratios (10 : 5 : 3, 10 : 3 : 1) were used. During experiment in the reactor’s aeration and anoxic tank DO concentrations were 3 mg/L and 0.2 mg/L respectively. Furthermore, in the reactor MLSS concentration was 2000 mg/L and flowrate was 2 L/hr. Experiment results showed that C : N : P, 10 : 3 : 1 ratio with 90 mins mixing and 60 mins aeration maximized removal efficiency at 97.3% T-N as compared to other conditions. The application of the SBR and MBR combined process showed efficient results.
연구논문 : SBR 및 MBR 공정을 이용한 분뇨폐수에서의 질소제거 특성
정진희 ( Jin Hee Jung ),윤영내 ( Young Nae Yoon ),이슬기 ( Seul Kee Lee ),한영립 ( Young Rip Han ),이승철 ( Seung Chul Lee ),최영익 ( Young Ik Choi ) 한국환경과학회 2015 한국환경과학회지 Vol.24 No.11
There are two treatment processes that are currently applied to ships are the biological treatment process using the activated sludge and the electrochemical treatment. However, neither of them are able to remove both nitrogen and phosphorus due to their limited ability to remove organic matters, which are main causes of the red tide. This study was conducted to identify the characteristics of nitrogen removal factors from manure wastewater by replacing the final settling tank in SBR (Sequencing Batch Reactor) process and applying immersion type hollow fiber membrane. SBR process is known to have an advantage of the least land requirement in special environment such as in ship and the immersion type hollow fiber membrane is more stable in water quality change. As the result, the average in the cases of DO (Dissolved Oxygen) is 2.9(0. 6∼3.9) mg/L which was determined to be the denitrifying microorganism activity in anaerobic conditions. The average in the cases of ORP (Oxidation Reduction Potential) is 98.4∼237.3 mV which was determined to be the termination of nitrification since the inflection point was formed on the ORP curve due to decrease in the stirring treatment after the aeration, same as in the cases of DO. Little or no variation in the pH was determined to have positive effect on the nitrification. T-N (Total Nitrigen) removal efficiencies of the finally treated water were 71.4%, 72.3% and 66.5% in relatively average figures, thus was not a distinct prominence. In being applied in ships in the future, the operating conditions and structure improvements are deemed necessary since the MEPC (Marine Environment Protection Committee). 227(64) ship sewage nitrogen is less than the standard of 20 Qi/Qe mg/L or the removal rate of 70%.