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화학적 및 생물학적 연속 처리에 의한 플루오렌 오염토양의 정화
이병대,Lee, Byung-Dae 한국환경보건학회 2011 한국환경보건학회지 Vol.37 No.2
We describe a method for effectively pretreating soil highly that has been contaminated with fluorene (${\gg}$ 120 mg/kg soil), i.e., we apply Fenton oxidation in which ethanol is added to increase fluorene removal. To obtain maximum fluorene removal efficiency, a minimum of 1.0 ml of ethanol, 0.35 ml of $H_2O_2$, and 0.2 ml of 0.5M $Fe^{2+}$ was needed per 1 g of fluorene-contaminated soil. Under optimal Fenton oxidation conditions, 13% of 9-fluorene was generated during Fenton oxidation of 43% fluorene. The biodegradability of 9-fluorenone was subsequently confirmed to be much more rapid than that of fluorene, i.e., biodegradability of 96% versus 35% over 31 days. These results demonstrate that the proposed treatment method can be effectively applied to remove fluorene prior to disposal at industrial waste sites.
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이병대,동재욱,Lee, Beoung-Dae,Dong, Jae-Uk 한국디지털건축·인테리어학회 2007 한국디지털건축인테리어학회 논문집 Vol.7 No.2
Now architecture has been become a significant element which is able to determine the competitiveness as a cultural product by going beyond the concept that architecture offer a space for just residence and office. From old times, planning and managing the urban space create living space to be more comfortable and efficient. Nevertheless, all of a public and private have resolved urban problems only to create economy growth by shortsighted approach. Therefore, a more macroscopic for composing an urban environment emerged the need for access in terms of the plan, to these aspects of the landscape and urban residential environment that can be applied to the United States's PUD techniques and focus on the development of urban space cases by applied PUD to improve a more rational and efficient urban space and to creation lively dwelling environment and the favorable landscapes forming want to try.
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Methylphenidate 투약에 따른 주의력결핍 광잉운동장애 아동의 정량화 뇌파의 변화
이병대,정성훈,이만기,장수민,백지령,임효덕 대한생물치료정신의학회 2002 생물치료정신의학 Vol.8 No.2
Objectives: Quantified Electroencephalography(QEEG) has been widely used to examine the electrophysiological disturbance in Attention Deficit Hyperactivity Disorder(ADHD), particularly with respect to increased slow wave activity and reduced fast wave activity. On the basis of these aspects, this study was designed to evaluate the effects of Methylphenidate(MPH) on QEEG in ADHD children by comparison of QEEG before and 1 hour after administration of MPH. Methods: The subjects that entered this study were 15 children (14 boys and 1 girls) who were diagnosed as ADHD by DSM-IV at department of psychiatry of Kyunpook National University Hospital and Baek's psychiatry clinic. We examined the Quantified Electroencephalography(QEEG) activity 1 hour after administration of MPH and compared these results with those of QEEG activity before administration of MPH. Results: 1) In central(T4) and posterior(Cp1, Cp2, P3, Po1, Po2, O1, Oz, O2) area, they showed statistically significant decreased absolute delta1(δ1) activity(P<0.05) 1 hour after administration of MPH, compared to the results before administration of MPH. 2) In central(C4) area, they showed statistically significant decreased absolute delta2(δ2) activity(P<0.05) 1 hour after administration of MPH, compared to the results before administration of MPH. 3) In anterior(F3) area, they showed statistically significant decreased absolute beta(β)2 activity 1 hour after administration of MPH, compared to the results before administration of MPH. Conclusion: The results in this study predict partly the hypothesis that Methylphenidate can manifest its effect on their symptoms by reversing increased slow wave activity and reduced fast wave activity in ADHD children. 저자들은 ADHD 환아들이 보이는 증가된 서파 활동(주로 전두엽 영역의 쉐타파)과 감소된 후두엽 영역의 베타파 활동이 각각 피질의 지연된 성숙(delayed maturation)과 각성 감소(hypoarousal)를 반영한다는 사실을 기초로 해서, MPH가 ADHD 아동에 미치는 신경생리학적 영향을 알아보기 위해서 2001년 1월 3일부터 2001년 7월 28일까지 경북대학교 병원 정신과 외래와 백 정신과의원을 방문한 환아중 ADHD로 진단받은 남아 14명과 여아1명등 15명의 환아들을 연구대상으로 하여 MPH를 주기 전과 MPH 투약 1시간후의 정량화 뇌파 소견을 비교하여 다음과 같은 결과를 얻었다.
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Regeneration of solid phase filter by chemical cleaning
이병대 한국응용과학기술학회 2024 한국응용과학기술학회지 Vol.41 No.1
Recently, separation membranes have been applied to fields such as water supply, sewage treatment, gray water reuse, and air pollution control. Chemical cleaning technology is attracting attention among the methods of reusing these expensive separation membranes. It was found that the separation membrane could be regenerated using chemical cleaning. Specifically, it was found that the use time of the separation membranes regenerated by chemical cleaning was sustainable for more than 1,700 hours. Additionally, it was found that the flux recovery ratio after chemical cleaning was maintained at least 60%. In addition, the flux recovery ratio of HYDREX 4710, an organic membrane cleaner, and 4703, an inorganic membrane cleaner, was 76% and 62%, respectively, showing the highest flux recovery ratio among the chemicals used. Considering that the target raw water of this study is biological secondary treatment water, it was suggested that chemical cleaning could be actively used to regenerate separation membranes in future water treatment.
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Evaluation of reaction site prediction in 3-ring PAHs according to calculation level
이병대 한국응용과학기술학회 2022 한국응용과학기술학회지 Vol.39 No.4
The radical reaction position was calculated by varying the calculation level for ACEL and ANT, which are detected with the highest frequency and concentration in PAHs pollution sites. The results of each calculation level were compared and evaluated with the existing literature. HF, B3LYP, B3LYP-D, and MP2 were used as the method for each level used for calculation. Except for HF, the MK charge by B3LYP, B3LYP-D, and MP2 was consistent with the experimental results. It was found that the dispersion effect was negligible in the calculation of ACEL and ANT because the calculation results by the B3LYP and B3LYP-D methods were the same. In particular, it was found that the MK charge calculation result by MP2 agrees well with the product/PAH ratio obtained as a result of the experiment. Considering the calculation cost, it would be preferable to use B3LYP to predict the radical reaction site of ACEL and ANT. However, considering the product/PAH ratio, it takes more time to calculate, but it is judged that it is better to use the MP2.
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