• 한국환경과학회지
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• 제19권11호
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• pp.1315-1322
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• 2010

A membrane bioreactor (MBR) was designed using polyvinylidene fluoride(PVDF)-type hollow fiber membrane modules with a treatment capacity of 10 ton/day. A pilot plant was installed in a sewage treatment plant and was operated with an intermittent aeration method which avoids any concentration gradient of suspended solids (SS) in the MBR. For continuous operation, the pilot plant was first tested with influent (mixed liquor suspended solid:MLSS of 1000-2000 mg/L) of aeration tanks in the sewage treatment plant. The MBR was pre-treated with washing water, 10% ethanol solution, 5% NaOCl solution and finally washing water, one after another. To demonstrate the effect of the MBR on sewage treatment, compared with conventional activated sludge processes, we investigated the relationships among permeate amount (LMH), change in operation conditions, influent MLSS level and sludge production. It was found that the optimum aeration rate and suction pressure were $0.3\;m^3$/min and 30~31 cmHg, respectively. Under stable conditions in aeration, suction pressure, influent flow rate and drainage, the SS removal efficiency was more than 99.99% even when the MLSS loading rate changes. Compared with conventional activated sludge processes, the MBR was more effective in cost reduction by 27% based on permeate amount and by 51.5% on sludge production.

• 대한가정학회지
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• 제17권4호
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• pp.35-42
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• 1979

The effects of salt concentration on the qualities of cooked egg preparations were evaluated. Diluted egg samples which contained different amounts of slat were prepared by diluting whole egg fluid with rice washing, anchovy stock , or distilled water. After heating them rapidly, hardness, gel strength, and amount of syneresis were determined along with the performance of sensory test. the pH of the diluted eggs also measured before heating. Results obtained from these experiments are summarized in the following. 1. The pH of whole egg, egg yolk, and egg white was 7.32, 6.31, and 8.41 , respectively. 2. The pH whole eggs after addition of diluting solutions and salt showed a little differences over the whole salt concentration as follows. distilled water dilution > anchovy stock dilution > rice washing dilution 3. The hardness and gel strength of cooked samples were increased with the increase of salt concentration in the range of low salt concentrations of all diluting solution. These physical properties marked maximal values at salt concentration of 3% and then decreased as salt concentration increased. 4. Amount of syneresis decreased as salt concentration increased regardless of all diluting solutions used. 5. In sensory test, 1% salt concentration were scored good by the panel members regardless of diluting solutions which showed no significant difference among three diluting solutions.

• 한국의류학회지
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• 제28권3_4호
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• pp.422-432
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• 2004

This study investigated underwear consumption behavior of women, who were 20∼59 years old and resided in Incheon during 2002 summer. 372 women completed questionnaires, and data were analyzed using factor analyses, t-test, ANOVA, $\chi$$^2$-analyses. They usually purchased underwear considering comfort and economic factor at a discount store. They wore sleeveless T-shirts, but they didn't wear underpants except panties highly all the year round. Higher rate of them wore pantyhose instead of underpants during autumn, winter and spring. They demanded unstitching of stitches and lengthened sleeves in most of the groups. And older and lowly educated women group wanted widen armhole of upper underwear, and tighten waistband of panties. They generally washed in washing machine using cold water. Besides they added oxygen bleach and softner during wash and final rinse. Older than 20's boil their underwear frequently. The women in a group of boiling commonly answered the looseness of waistband. It is recommended not to boil but to soak with bleach added warm water for improving the whiteness and durability of underwear. For a treatment with higher temperature deprives the elasticity of spandex.

• 여성건강간호학회지
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• 제19권4호
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• pp.285-294
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• 2013

Purpose: The study was done to survey feminine hygiene and vaginal douche practices in middle-aged women to obtain basic information for public health education. Methods: With a descriptive survey design, 134 middle-aged women who have menstrual period were recruited via convenience sampling. Survey contents were from the study by Czerwinski (2000) regarding feminine hygiene and vaginal douching practices. After obtaining IRB approval, a self-administered structured questionnaire was distributed to study participants. Results: Mean age of middle-aged women was 46.88 years old. Fifty-six percent of the women practiced vaginal douching. Women performed douching with water (68%), commercial products (13%), soap (12%), and vinegar-mixed water (6%) for clean and fresh feeling, removal of unpleasant odor, and removal of vaginal discharge. Vaginal douche practice was significantly related to a history of vaginitis. Conclusion: The study results indicate that most of the women practiced inadequate feminine hygiene especially in douching, suggesting that is important to develop education programs on feminine hygiene practices for women of all ages, especially regarding douching and hand washing before and after changing pads or tampons.

• 분석과학
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• 제14권6호
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• pp.516-521
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• 2001

본 연구는 우리나라 생활폐기물 대형소각시설(200톤/일 이상)에서 발생되는 바닥재중유해금속류의 용출저감을 위해 수행된 것이며, 주요 유해물질로는 납(Pb)과 구리(Cu)를 택하였다. 납의 용출저감을 위해서 공기접촉 산화처리방법을 사용한 결과, 납이 거의 검출되지 않을 정도의 저감효과를 나타내었으며 구리의 용추저감을 위한 방안에서는 물 세척법이 저감효과가 있는 것으로 나타났다. 또한, pH 변화에 따른 금속의 용출농도를 분석한 결과, 용출저감을 위한 안정적인 pH 범위는 7~12가 되어야함을 알 수 있었다.

• 패션비즈니스
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• 제23권3호
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• pp.23-34
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• 2019

The aim of this study is to explore the possibility utilizing Rhododedron brachycarpum as a new natural dye resource. It was dyed in silk fabric according to different dyeing conditions such as dye concentration, dye bath temperature, dyeing time and dye bath pH. The effect of the mordanting conditions were estimated as dyeability and color changes. Additionally, the colorfastness, antibacterial property, ultraviolet protection properties of the dyed and mordanted silk fabrics were examined. The water-soluble dye of Rhododedron brachycarpum extracted with distilled water was expressed as Yellow Red color. The dye-abilities of silk generally increased depending on the increasing values of dye concentration, dye bath temperature and dyeing duration. The highest K/S values were obtained at a dye concentration of 100% (v/v), a dye bath temperature of $90^{\circ}C$, a dyeing duration 120 minutes and a dyeing of pH 2. The light fastness of dyed and Cu mordanted silk fabrics were found to be 4 grade while Al, Fe mordanted silk fabrics were found to be 2~3 grade. The dry cleaning and rubbing fastness were excellent or good. The fade of washing fastness was not good, however, the stain of washing fastness was excellent. The dyed and Al, Cu mordanted silk fabrics indicated 99.9% reduction rate. The dyed and the mordanted fabrics showed very good ultraviolet protection factors.

• 한국식품위생안전성학회지
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• 제22권3호
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• pp.192-198
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• 2007

김치는 우리나라의 대표적인 전통 식품이며 참살이(well-being) 식품으로 인정되고 있지만, 최근 김치를 수입 농산물로 만들거나 완전 제조한 상태로 수입되고 있어 이에 대한 안전성 확보가 요구된다. 따라서 안전한 김치 제조를 위해서는 김치 재료의 생물학적 위해요소 제거가 필수적이다. 본 연구는 김치의 주재료인 배추를 대상으로 배추에 존재할 수 있는 생물학적 위해 요소, 특히 기생충 오염을 제거 위하여, 기생충란 오염 배추 모델을 이용하여 배추의 효과적 세척 방법을 평가한 결과 다음과 같은 결론을 얻었다. 배추에 붙어 있는 흙을 없애고, 뿌리 및 오염된 잎을 제거한 다음, 3단계 이상으로 분리된 세척조로 분리 급수하면서(유속 0.8 m/sec 이상 유지) 소금에 절인 배추를 각 세척조에서 다음과 같이 수세한다. 손가락으로 배추의 뿌리부분과 잎 사이를 골고루 벌려 잡고, 배추를 물속에 넣은 후 물속에서 상하로 20cm 이상 넣었다 빼는 것을 3회 이상 반복 후 다시 좌우로 30cm 이상 3회 이상 흔들어 세척한다. 이때 세척 횟수 및 세척수의 유속을 증가시키거나 야채용 세제(제1종 세제)을 첨가시 세척효과는 더 증가하였다.

• 생약학회지
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• 제45권1호
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• pp.41-47
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• 2014

This study was conducted to investigate the content of foreign mineral materials and heavy metals (Pb, As, Cd, Hg) contained in commercial herbal medicines (1504 samples) classified by parts used, and the effect of removing heavy metals by washing treatment (take 50 g of the sample and put 1000 ml of distilled water, shake it gentle by hand for 1 min). The 5% trimmed means of acid-insoluble ash value (%) were as follows; above ground parts (0.76) and underground parts (0.52). Those of the total amount of individual heavy metals value (mg/kg) were as follows; caulis (1.33), flos (1.23), herba (0.91), cortex (0.76), rhizoma (0.73), radix (0.67), semen (0.44) and fructus (0.39). Acid-insoluble ash content was correlated with Pb in herbal medicines of underground parts (r=0.446) (p<0.01). After washing, the removal rate of heavy metals contained in 6 radix herbal medicines shows 33-13% respectively.

• 방사성폐기물학회지
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• 제13권1호
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• pp.35-43
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• 2015

선행핵연료 주기관련 시설의 해체/복원 시 방사능으로 오염된 다량의 자갈폐기물이 발생할 수 있다. 하지만 현재 방사성 오염 자갈을 제염하기 위한 기초자료가 부족하므로, 본 연구에서는 토양세척법을 응용하여 방사능 오염 자갈을 제염하는데 필요한 기초실험을 수행하였다. 효율적인 제염을 위하여 제염제를 비교하여 선정하였는데, 우라늄으로 오염된 자갈의 제염제로는 증류수나 계면활성제보다 0.1 M의 질산을 사용하였을 때 제염이 잘 되었다. 또한, 제염효율을 높이고 제염시간을 단축하기 위하여 우라늄 오염 자갈을 파쇄/분쇄한 후 세척한 결과, 입자의 크기가 작으면 작을수록 제염효율이 높고 자체처분허용농도를 만족하는 것으로 나타났다.

• 복식
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• 제65권7호
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• pp.47-59
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• 2015

This paper studies the conservation treatment of Lady Shim's costume, which was excavated in Jecheon Province in 2012. There were the significant problems, which were encountered in the treatment of the costume ; First the Jeogoris were transformed during the excavation, Second fibers were seriously deteriorated, Third most of the fabrics such as Chusa were readily deformed. To overcome these problems and to secure stability in the conservation treatment, we decided to alternate between two different washing methods ; dry cleaning by n-hexane and wet cleaning by water. The costume shape was recovered by steaming and by swelling with Hanji(Korean traditional paper). The combined cleaning method proved to be relatively efficient and stable. In addition, the shape of Chusa was well preserved by dry cleaning.(using n-hexane also solved the problem of bad smell after washing with organic solvents.) The effects of the conservation treatment on the excavated costumes could be seen in the change of Lab color difference. Washing made the distribution of Lab color difference narrower, which may suggest that the impurities on the fiber was removed by washing. In addition, the value of L was greater than a-value and b-value after the treatment. This result indicates that the change of value represents the change of color difference by cleaning.