• 한국지구과학회지
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• 제31권6호
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• pp.563-572
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• 2010

흙댐에서의 누수 구역을 판별하기 위해 다채널 연속 온도 모니터링을 수행하고 이를 검증하기 위해 전기비저항 물리탐사를 함께 수행하였다. 일반적으로 댐이나 사면과 같은 인공구조물의 내부는 시간과 위치에 따라 상이한 온도 분포를 갖는 것으로 여겨진다. 이와 같은 분포는 구조물의 안전성을 판단하는 데 매우 중요한 기본 자료로 이용될 수 있으며, 특히 댐 구조물의 경우 과도 침투수나 누수에 의한 위험 대역을 파악할 수 있는 기술로 이용될 수 있다. 그러나 기존의 온도 측정 방식은 대형 구조물의 온도를 연속적으로 동시에 측정할 수 없는 단점을 가지고 있다. 본 연구에서는 이를 극복한 새로운 온도 모니터링 장비를 이용하여 댐의 상부 및 하부에 걸쳐, 여러 지점에서 동시에 온도 분포를 측정하였으며, 실내 시험을 통해 누수 대역이 온도 분포의 이상을 충분히 반영하고 있음을 관측하였다. 또한 대상 댐의 전 구역에 걸쳐 전기비저항 조사를 수행한 결과와 온도 모니터링 자료를 비교 분석하여 누수구역의 판별력을 높일 수 있는 방법을 제시하고자 하였다.

• Korean Chemical Engineering Research
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• 제54권1호
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• pp.89-93
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• 2016

본 연구에서는 식물세포배양으로부터 항암물질 파클리탁셀 및 이의 반합성 전구체 10-디아세틸파클리탁셀의 분리 양상을 조사하였다. 식물세포인 바이오매스를 이용한 분리/정제 공정인 용매를 이용한 바이오매스 추출, 액-액 추출, 흡착제 처리, 헥산 침전, 분별 침전을 순차적으로 수행한 결과, 흡착제 처리 공정에서 10-디아세틸파클리탁셀는 파클리탁셀로부터 가장 효과적으로 분리됨을 알 수 있었다. 파클리탁셀 및 10-디아세틸파클리탁셀 분리에 적합한 흡착제 종류, 건조시료/흡착제 비율, 흡착제 처리 온도는 각각 실로퓨트, 1:1.5(w/w), $20^{\circ}C$ 이었다. 최적의 흡착제 처리 조건에서 10-디아세틸파클리탁셀은 74.1% 분리/회수 가능하였다.

• 한국의류산업학회지
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• 제20권3호
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• pp.323-330
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• 2018

This study aim is to provide new coloration method by laccase-catalyzation on natural phenolic dyeing process. In this study, silk was dyed with black tea, which is one of polyphenolic dye, extracted in distilled water. The dyed samples were catalyzed by laccase as the eco-friendly mordanting process. To optimize the conditions of laccase-catalyzed coloration, conditions were varied by different mordanting methods (one-bath, two-bath), temperature and treatment time. The dye affinity in terms of the value of K/S, $L^*$, $a^*$, $b^*$, and H, V, C was measured by Computer Color Matching System (CCM, CM-2600d, Spectra Magic NX, Korea). The effect of laccase-catalyzed coloration on washing fastness was evaluated and compared with the synthetic mordant (Al, Cu, and Fe). As the result of color analysis of dyed silk, the optimum conditions of laccase-catalyzed coloration were determined to post-mordanting by one-bath at $50^{\circ}C$ for 3 hours. Under the optimum laccase-catalyzed conditions, the dyed silk was shown the color of yellowish-red. After laccase-catalyzed coloration on the dyed silk, the improvement of washing fastness was obtained compared with mordanted silk by synthetic mordant (Al, Cu, and Fe). Therefore, the present study was demonstrated that the effective enzymatic mordanting method by laccase for phenolic natural dyeing with vivid color and good fastness.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.307.2-307.2
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• 2016

In this study, we synthesized Au nanoparticles (AuNPs) in polyacrylonitrile (PAN) thin films using a simple annealing process in the solid phase. The synthetic conditions were systematically controlled and optimized by varying the concentration of the Au salt solution and the annealing temperature. X-ray photoelectron spectroscopy (XPS) confirmed their chemical state, and transmission electron microscopy (TEM) verified the successful synthesis, size, and density of AuNPs. Au nanoparticles were generated from the thermal decomposition of the Au salt and stabilized during the cyclization of the PAN matrix. For actual device applications, previous synthetic techniques have required the synthesis of AuNPs in a liquid phase and an additional process to form the thin film layer, such as spin-coating, dip-coating, Langmuir-Blodgett, or high vacuum deposition. In contrast, our one-step synthesis could produce gold nanoparticles from the Au salt contained in a solid matrix with an easy heat treatment. The PAN:AuNPs composite was used as the charge trap layer of an organic nano-floating gate memory (ONFGM). The memory devices exhibited a high on/off ratio (over $10^6$), large hysteresis windows (76.7 V), and a stable endurance performance (>3000 cycles), indicating that our stabilized PAN:AuNPs composite film is a potential charge trap medium for next generation organic nano-floating gate memory transistors.

• 한국환경보건학회지
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• 제27권1호
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• pp.93-99
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• 2001

This study aims at finding out pertinent reaction conditions for treating high concentration ammonia contained in N-chemical factory wastewater with decompressed ammonia stripping method that was designed. And it also tries to investigate adsorption capability of removed ammonia to soil. The results from experiments are as follows ; 1. The removal rate of N $H_3$-N of synthetic wastewater was under 85% at pH 10 with decompressed ammonia stripping method. The reaction time in pressure 360 mmHg at pH 11 and 12 was shorter than in 460 mmHg, and the removal rate of N $H_3$-N with decompressed ammonia stripping method at 9$0^{\circ}C$ was 11~15% higher than air stripping 2. The optimum conditions for decompressed ammonia stripping with synthetic sample were shown as pH 12, temperature 9$0^{\circ}C$, internal reaction pressure 460 mmHg and reaction time 50 minutes. These conditions were applied to treat the wastewater containing organic-N 290.5mg/$\ell$, N $H_3$-N 168.9mg/$\ell$, N $O_2$-N 23.2mg/$\ell$, N $O_3$-N 252.4mg/$\ell$, T-N 735mg/$\ell$. Organic-N turned out to be removed 60%, the removal rate of N $H_3$-N IS 94%, T-N is 50%. But N $O_2$-N and N $O_3$-N were increased with 7.8% and 14.9% respectively. 3. The CO $D_{Sr}$ removal rate in decompressed ammonia stripping reaction was 42% and S $O_4$$^{2-}$ was removed 8.2%. It was turned out caused with higher pH and thermolysis. 4. In soil adsorption of ammonia desorbed from the decompressed stripping process of wastewater, the recovery rate was 76% in wet soil.

• 공업화학
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• 제2권4호
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• pp.372-384
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• 1991

국내 부존의 함티탄자철광으로 부터 천연 rutile 광의 대체를 위한 합성 rutile의 제조 및 고순도 철산화물을 제조할 수 있는 새로운 공정개발과 아울러 황산암모늄을 황산화제로 사용할 수 있는 새로운 용도개발의 가능성을 조사키 위해 함티탄자철광과 황산암모늄의 반응을 시도하였다. 그 결과 적절한 황산화 반응조건은 반응온도 $425^{\circ}C$, 반응시간 2.5h, 시료 함티탄자철광에 대한 황산암모늄의 무게비 11.0 그리고 시료ilmenite의 입도 -250 mesh였다. 이 조건에서 얻어진 황산화된 함티탄자철광을 물로 침출시켜 90.4%의 $TiO_2$와 85.3%의 Fe를 함티탄자철광으로 부터 추출하였다. 이 추출 용액으로 부터 제조된 합성 rutile의 $TiO_2$ 품위는 93.8%로서 rutile과 anatase의 혼합결정구조 였으며 철산화물은 순도 97.6% 의 ${\alpha}-Fe_2O_3$였다.

• 한국염색가공학회:학술대회논문집
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• 한국염색가공학회 2012년도 제46차 학술발표회
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• pp.121-121
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• 2012

To evaluate the Hwangsu spring as natural mordants effect on dyeing. The natural mordant effect of Hwangsu spring was analyzed by pH, temperature, trace elements and organic matter. Hwangsu spring having pH 2.42 and $14.4^{\circ}C$ was harvested at the end of September, 2011, in Yeongcheon(Gyeongbuk Province, Korea) and left on a $0^{\circ}C$ and $25^{\circ}C$ before use. The Result of ICP analysis, it contain bned Fe(414.9 ppm), Al(88.9 ppm), Mn(4.9 ppm). Dyeing and post-mordant procedure; Fabrics(cotton, silk, rayon) were dyed with natural colorants(Sopbora Japonica L., Caesalpinia sappan L., Allium cepa L.) for 20 min at $80^{\circ}C$. Hwangsu spring, aluminium sulfate $14-18H_2O(Al_2(SO_4)_3{\cdot}14-18H_2O)$, iron sulfate peptahydrate($FeSO_4{\cdot}7H_2O$), copper sulfate pentahydrate($CuSO_4{\cdot}5H_2O$) were used by post mordants. But in the case of Caesalpinia sappan L. was dyed after pre-mordanting with Al(II). The fabrics were dyed with each mordant solutions at $25^{\circ}C$ for 10min. The colorless also was measured by color-differnce meter. Comparison with a synthetic mordants, the K/S values of cotton fabrics dyed with Hwangsu sping were increased.

• 자원리싸이클링
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• 제20권6호
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• pp.28-36
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• 2011

황산용액 중에 존재하는 니켈을 회수하기 위해 이온교환수지법을 이용한 기초연구를 수행하였다. 제조된 모의 니켈(Ni)용액에 독일 Lanxess사(社)의 Lewatit Monoplus TP 220를 이용하여 회분식 실험을 하였다. 흡착반응에 영향을 미치는 온도, 교반속도, 반응시간, pH, 이온교환수지 양, 니켈이온농도 등에 대해 고찰하였다. 초기 pH(2.0~5.0)와 교반속도는 니켈의 흡착에 거의 영향을 미치지 않았으며, 평형에 도달하기 위하여 72시간의 시간이 필요했다. 평형실험결과 Freundlich 흡착등온식에 적합하였고, 흡착반응속도는 유사 2차 반응 모델(pseudo-second order)로 잘 모사되었다. 한편 니켈을 함유한 실제 도금세정폐액의 흡착 실험을 행하여 모의용액의 흡착거동과 비교하였고, 흡착된 니켈은 황산 농도가 높아짐에 따라 수지로부터 효과적으로 용리되었다.

• 한국세라믹학회지
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• 제56권2호
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• pp.146-152
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• 2019

In order to study the transport behavior of tripolyphosphate (TPP) in aqueous solutions, the adsorption process of TPP on synthetic goethite, which exists stably in supergene environment, has been systematically studied. The adsorption properties under different conditions (pH, electrolyte presence, and temperature) were investigated. The adsorption of TPP in the presence of humic acid (HA)/fulvic acid (FA) has also been discussed in this paper. The results indicated that the adsorption capacity quickly increased within the first hour and equilibrium was reached within 24 h. The adsorption capacity decreased from 1.98 to 0.27 mg·g^-1 upon increasing the pH from 8.5 to 11.0, whereas the adsorption of TPP on goethite hardly changed with increasing electrolyte concentration. The results of analysis of the kinetic and isothermal models showed that the adsorption was more in accord with the pseudo second-order equation and Freundlich model. The adsorption capacity decreased obviously regardless of the order of addition of TPP, HA, and goethite. Subsequent addition of FA led to a large increase in the adsorption capacity, which might be attributed to the adsorption ability of FA. According to the predictions of the kinetic and isothermal models and the spectroscopic evidence (X-ray diffraction (XRD), Fourier Transform infrared spectroscopy (FT-IR), and scanning electron microscope (SEM)), the adsorption mechanism may be mainly based on surface complexation and physical adsorption.

• 한국응용과학기술학회지
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• 제27권2호
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• pp.107-113
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• 2010

The object of this research is to conform of practicable possibility and recycling of producing junk after citrus fruits is processed. With extracting d-limonene oil that have 70~90% a component of oil out of junk citrus peel, making certain the about 12000ppm concentration of it. Limonene derived from citrus in jeju using conventional synthetic detergents can be replaced with the development of environmentally friendly natural detergent investigated the possibility. Mostly due to ocean dumping, disposal and cause environmental problems by recycling natural citrus cleaner alternative to the research conducted on the possibility. Cleaning efficiency with temperature did not affect the largest concentrations were able to identify the difference between cleaning efficiency. At least 10% of the d-limonene oil could be from the cleaning performance, increasing the concentration of the cleaning efficiency was increased in size. Ultrasonic is very high removal efficiency under the conditions shown in the cause of pure self-generated ultrasonic cleaning power as co-effects of d-limonene oil appears to chemical cleaning effect of ultrasonic cavitation occurs in the physical cleaning effect due to a combination of synergistic stability is maximized by low concentrations of d-limonene oil in a short time showed an excellent cleaning ability. Having the ability of cleaning at the same time, considering the side recycling in the junk citrus peels reflects possibility of basic materials utility eco-friendly in the skin soap, bath soap, cosmetics etc, through ability of exclusion a contaminant in based cleaning effect(EC) it can prospect substitution effect environmentally in the pre existence synthetic detergents.