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정수장 슬러지(Alum Sludge)로부터 PACl(Polyaluminum Chloride) 응집제 제조에 관한 연구
김인배,이상봉,김동윤,김부길,Kim, In-Bae,Lee, Sang-Bong,Kim, Dong-Youn,Kim, Boo-Gil 대한환경공학회 2000 대한환경공학회지 Vol.22 No.3
정수장에서 발생하는 슬러지에는 처리과정에서 주입되는 응집제로 인하여 다량의 알루미늄 성분이 함유되어 있으며, 정수장에서 널리 사용되고 있는 폴리염화알루미늄(PACI) 응집제의 원료는 전량 수입되고 있는 실정이다. 본 연구는 정수 슬러지의 효과적인 재활용을 목적으로 수행되었다. 슬러지내의 알루미늄 성분을 염산(HCI)으로 용출하고 HCI 가스를 주입하여 염화알루미늄수화물($AlCl_3{\cdot}6H_2O$)을 제조하였다. 그리고 저온($180^{\circ}C$)에서 열분해시켜 고체상태의 염기성 염화알루미늄 [$Al(OH)_xCl_{3-x}$]을 얻은 후 이것을 물에 용해시켜 PACl(Polyaluminum chloride)을 제조하였다. 슬러지 용출 실험 결과 반응시간 10분, 반응온도 $105^{\circ}C$, 염산농도 27.65wt%에서 최적 용출율을 얻을 수 있었으며, KS 규격실험 결과 순도 98.7% 이상의 염화알루미늄수화물($AlCl_3{\cdot}6H_2O$)을 제조할 수 있었다. 제조된 PACl 응집제($PACl_{re}$)는 KS 규격을 모두 만족하였고, 열분해시 최적 열분해 온도는 $180^{\circ}C$이며 이때 염기도는 열분해율에 의해 결정되었다. 제조된 PACI 응집제($PACl_{re}$)와 기존의 PACI 응집제(PACI)의 성능비교 실험 결과, 탁도, DOC, $UV_{254}$ chlorophyll-a에서 유사한 효과를 보이는 것으로 나타났다. Sludge produced from water treatment plants contains plenty of aluminum due to addition of coagulants, polyaluminum chloride(PACI) which has been widely used in most of water treatment plants. however. the whole of PACI is imported from other countries. In this research. the effective methods for recycling PACI from sludge of water treatment plants were developed and evaluated. Aluminum chloride hexahydrate($AlCl_3{\cdot}6H_2O$) was obtained by sparging HCl gas aluminum extracted from sludge using hydrochloric acid (HCI). This aluminum chloride hexahydrate was solidified by decomposition at $180^{\circ}C$. and dissolved in water to produce PACI. The optimum extraction rate was obtained at the condition of 10 minutes of reaction time. $105^{\circ}C$ of reaction temperature. 27.65%(W/W) of HCI concentration. The KS experiment proved that manufactured aluminum chloride hexahydrate was 98.7% degree and the recycled PACI coagulants agreed with the KS standard. The optimum temperature of decomposition was $180^{\circ}C$ and the basicity of the PACI was decided upon the extent of decomposition The compared experiments between purchased coagulant and manufactured coagulant presented that both coagulants had same performance for turbidity, DOC, $UV_{254}$ absorbance. and chlorophyll-a.
중앙은행 적립금의 운용에 관한 공공선택이론적 연구 - 61개국 자료를 이용한 실험적 접근 -
김인배,김일중,권윤섭,Kim, Inbae,Kim, Iljoong,Kwon, Yunsub 한국개발연구원 2004 KDI Journal of Economic Policy (KDI JEP) Vol.26 No.2
최근 국내에서는 "특별회계 및 기금 정비방안"에 관한 공청회가 열리는 등 공공기관에 의한 기금 및 적립금의 목적과 운용 행태에 대한 관심이 촉발되고 있다. 그러나 공공경제학을 공부하는 이들에게 중앙은행의 적립금은 별 관심의 대상이 아니었다. 다분히 실험적 연구의 성격을 띤 본 논문은 61개국 자료를 이용하여 각국 중앙은행이 내부 유보한 적립금이 통화정책 당국의 재량권확대 유인과 밀접한 관련이 있음을 보인다. 구체적으로 통화정책에 있어서 통화당국 관료의 재량권 여지가 큰 중앙은행 대출이 적립금과 직접적인 관계가 있음을 실증분석을 통해 검증한다. 한국의 경우, 이미 김인배 외(2001)에서 중앙은행 적립금이 중앙은행 대출과 관련이 있음을 보였던바, 이를 국제자료를 통해 확인함으로써 중앙은행 적립금의 성격과 의미를 재고하며 동시에 가설의 일반화를 시도한다. Although various publicly reserved funds have recently come to the fore of academic and policy-making attention in Korea, researchers rarely take up the issue of the reserve fund retained from annual profits by the central bank (i.e., the Bank of Korea). Starting with the general public choice premise that bureaucrats seek to maximize their discretionary budget, this paper first provides a theoretical reasoning why central bank's bureaucrats would prefer retaining annual profits to turning them to the Treasury. The major tenet to be emphasized is that retained profits as a reserve fund can give the central bankers discretionary power in their disposition. In particular, we focus on the close relationship between the reserve fund and the discount windows. The latter, as a monetary instrument, has traditionally been demonstrated to cause secrecy, arbitrariness, and other bureaucratic amenities in the previous literature. Subsequently, this paper, based on 61 countries data, empirically verifies that the central bank's reserve fund is at least partially used to additionally increase the discount windows. Since an excessive use of discount windows results in inflationary bias, we conclude the paper with some policy suggestions to have such bureaucratic power of discretion in check. This paper, if in its experimental nature yet, is expected to shed a critical implication for establishing the meaningful independence of the central bank to a host of countries.
수도 만식재배에 있어서 재식밀도가 수량구성요소 및 수량에 미치는 영향
김인배,이주열,In-Bea Kim,Joo-Yeol Lee 한국작물학회 1979 한국작물학회지 Vol.24 No.2
본 시험은 수도 만식재배에 있어 m^2당 재식밀도나 주상묘수를 달리 하였을때 수량구성 요소 및 수량에 미치는 영향을 구명코져 실시하였든바 그 결과를 요약하면 다음과 같다. 1 . 재식밀도의 증가와 주당묘수의 증가는 단위면적당 수수와 영화수를 증가시켜 수량의 증대를 가져왔다. 2 재식밀도의 증가, 주당묘수의 증가는 단위면적당 엽신장과 엽신의 건물중을 높여 영화수를 증가시켰다. 3. 재식밀도의 증가는 단위면적당 엽면적과 건물중을 높여 수량을 증대시키는 요인이 되고 있다. 4. 밀양2001의 만식기는 m^2당 재식밀도는 28~33주, 주당묘수는 6본식으로 하는 것이 유리할 것으로 본다. This study has been carried out to find out the optimum plant density and number of seedling per hill in the late season culture of rice at Chung Buk. P.O.R.D. Up to the level of 33 hills per m2 and 6 number of seedling per hill, rice yield was increased as the number of seedling per hill and plant density per unit areas increased. However it is recommendable to have a plant density of 28~33 hills per m$^2$ with 4~6 number of seedling per hill for the late season culture.
김인배,안진선,Kim Inbae,Koopman Ben.,An Jinsun 한국환경보건학회 2004 한국환경보건학회지 Vol.30 No.5
Seaweed waste(SWW) was used to improve the liner effect in recycling of dredged soil as the landfill liner. It was found that the compressive strength became somewhat lower when SWW was added than that was when Ordinary Port-land Cement(OPC) only was added. The permeability coefficient, however, became lower in this case which showed the lowest permeability coefficient when the addition of SWW was one percent. Hence, to comply with the regulations for the compression strength and permeability coefficient of landfill liner, the addition of OPC should be over eight percent and that of seaweed waste one percent. The results of leaching test showed that the solidified material was not against the laws of waste control, so it is possible to use as the landfill liner and to expect sufficient economic effects because wastes such as dredged soil and seaweed can be recycled.
물리치료사에 의해서 실시되는 도수수동 운동이 자율신경계에 미치는 영향
김인배 ( In Bae Kim ),김충유 ( Chung Yoo Kim ),김은경 ( Eun Kyung Kim ),신한기 ( Han Ki Shin ),강종호 ( Jong Ho Kang ) 대한물리의학회 2015 대한물리의학회지 Vol.10 No.1
PURPOSE: The purpose of this study was to investigate the effects of ten minutes of manual passive exercise performed by physical therapists on autonomic nervous system. METHODS: Thirty-five healthy adults, both male and female, were chosen as subjects for this study. The autonomic nervous system was measured by heart rate variability (HRV),before and after passive exercise using the following measurements: mean heart rate (mean HRT), low frequency (LF) and high frequency (HF) components, the LF/HF ratio, root mean square of the successive differences (RMSSD), and the HRV index. The exercise was performed on the subjects by a physical therapist with seven years of experience specializing in the nervous system. The exercise was conducted at the mid-range of motion on the upper and lower limbs of the subjects for two minutes and thirty seconds and for a total of ten minutes. RESULTS: There was a significant increase in the LF component. The mean HRT and the LF/HF ratio both increased, but these increases were not significant. The HF component, RMSSD, and HRV index all decreased, but these decreases were not significant. CONCLUSION: In conclusion, mid-range manual passive exercise does not induce stress on the autonomic nervous system. It can safely be performed by a physical therapist.