• Journal of Environmental Health Sciences
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• v.15 no.2
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• pp.33-40
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• 1989

Dichromate reflux method for COD analysis is one of the useful and precise way to solve the organic content of the wastewater. But the standard procedure for COD is not entirely satisfactory for sample containing appreciable amounts of inhibiting substance, especially chloride ion. Under the conditions of the established test, a big disadvantage of the method is that dichromate oxidizes chloride quantitatively to chlorine. When it is necessary to use silver sulfate as a catalyst in the COD procedure, chloride must be removed before the addition of the catalyst. Silver sulfate and mecuric sulfate forms a precipitate of AgCl and HgCl$_{2}$ separately which is not completely oxidized during the test and, therefore, cannot be corrected for. So, we evaluate and compensate the amount of chloride oxidation in the absence of chemicals during the experimental procedure. Calculation of COD is made using the following reviced formula: real COD = tested COD - 0.2277Cl.

• Proceedings of the Korea Contents Association Conference
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• 2003.11a
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• pp.91-95
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• 2003

한국전쟁기 북한 소설에 대한 북한의 문학사적 평가는 남한의 문학사와 비교할 경우 매우 큰 차이를 보여주고 있다. 남한에서 나온 대부분의 문학사에서는 한국전쟁기 남한 소설에 대해 대체로 부정적인 평가를 내리고 있으나, 북한에서 나온 문학사의 경우에는 한국전쟁기 북한 소설을 매우 긍정적으로 평가하고 있는 것이다. 물론 이러한 평가는 남북한 문학사의 문학에 대한 관점의 차이에서 비롯되었다고 할 수 있다. 그러나 북한에서 나온 북한문학사의 경우에는 정치적 목적에 따라 작품을 왜곡하여 평가하고 있는 경우가 많으므로 사실에 대한 면밀한 검토가 필요하다. 이태준, 김남천, 임화 등 남로당 계열 작가의 작품에 대한 북문학사의 평가는 특히 그러한데, 남한에서 이루어진 북한문학에 대한 논의들은 이러한 사실을 지적하면서 한국전쟁기 문학에 대한 실증적인 자료조사와 과학적 연구의 필요성을 제기 하고 있다.

• JOURNAL OF ELECTRICAL WORLD
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• s.287
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• pp.63-67
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• 2000

한국전력공사 울진원자력본부는 지난 6월 12일 경상북도로부터 $\lceil$자율환경관리기업$\rfloor$으로 선정되었다. 경상북도는 도내 공단을 제외한 환경오염물질 배출업소 5,234개 기업체 중 엄격한 심사와 현장 확인 등을 통해 울진원자력본부 등 6개 업체를 경상북도 최초의 자율환경관리기업으로 선정하고 2000년 6월부터 2003년 6월까지 선정된 각 업체의 모든 환경관리를 자율적으로 관리하도록 하는 $\lceil$자율환경관리협약$\rfloor$을 체결하였다. 이는 국내 원자력발전소로서는 처음으로 울진원자력본부가 행정기관으로부터 환경친화기업으로 인정받았다는 점에서 그 의의가 매우 크며, 또한 그 동안의 원자력발전소 환경관리에 대한 외부의 부정적인 인식을 크게 바꾸는 좋은 계기가 되었다.

• Journal of Environmental Health Sciences
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• v.8 no.1
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• pp.99-107
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• 1982

This study was carried out to improve the curriculum in the department of environmental science technology in junior college, and the results were as follows 1. The educational aim of the department of environmental science technology in junior college has been rearranged. 2. The curriculum has been developed in accordance with the educational aim of this department. 3. The adoption of majoring courses is desirable. 4. The respective educational aims and the respective syllabus of the courses have been set up in accordance with the curriculum. 5. Studies on environmental planning and environmental economics which are necessary in future society, are disirable. 6. The enlargement of the educational oppurtunity in field-works by means of the efficient administration of cooperation committee of industry-college and of the educational effect by means of the utilization of the technology and man-power in the fields of the industry is really desirable.

• Journal of Environmental Health Sciences
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• v.5 no.1
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• pp.71-75
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• 1978

Distribution of Vibrio parahaemolyticus in the Tegillaria granosa Linne in Costal area Inchun. The survey has been done chiefly from the Inchun Sea ports during 5 months from Oct. 1974 to May 1975. 1. The number of Vibrio parahaemolyticus isolated 17(13.8%) of 117 specimens from Anadara Subcrenata. 2. The number of Vibrio alginolyticus isolated 92 strains of 119 specimens from Tegillaria granosa Linne. 3. Bacteriological characterigation such as morphological, ecological, biochemical results of 17 isolated strain has been identified the category of typical Vibrio parahaemolyticus differentiation. 4. Most of Kanagawa positive strains was positive in Greig test, and considerable number of Kanagawa negative strains was also positive. The result of Greig test was almost the same between cultures in brain heart infusion broth and brain heart infusion agar. 5. Kanagawa positive strains showed same lethal activity in inoculated mice into peritoreal cavity as compared with Kanagawa negative strain.

• Proceedings of the Korean Radioactive Waste Society Conference
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• 2006.06a
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• pp.251-252
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• 2006

원자력발전소는 기체폐기물의 90% 이상을 계획예방정비기간 중에 방출한다. 기체 폐기물 방출은 filter를 거치지 않고 대량 방출하는 고체적 방출과,filter를 거쳐 방출하는 저체적 방출이 있다. 고체적 방출은 방출농도계수가 5842, 저체적 방출은 계수가 183052로 이 이하로 방출만 하면 발전소제한구역(EPB Emergency Planning Zone)에서의 법적허용치 농도 ECL(environmental Control Limit)를 초과하지 않게 된다. 원전에서는 현재 기체방출 시 이 기준치(농도계수)의 1/10을 자체관리 기준치로 하여 적용하고 있다. 실제 울진3호기 4차O/H 시 그 실적을 파악해 본 결과 고체적 방출 시 방출농도계수가 최대 312, 저체적 방출 시는 최대 707을 넘지 않아 허용방출 농도계수와 비교하면 비교가 되지 않을 정도로 낮게 방출하였음을 확인하였다

• Cross-Cultural Studies
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• v.35
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• pp.79-95
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• 2014

This article aims at rethinking on people of Modern styles in early modern period with reference to A Large River[Dae-Ha] written by Kim Nam-cheon at 1939. Park Sung-guoen could be called to Homo Economicus, first, have maximized of self-interest in rapid changes of Korea society with loan sharking, rising to upper class in new early modern era instead of traditional nobleman. Park Hyung-geol could be said romantic guy, second, have chased romatic love consist of three elements(love-sex-marriage). But he troubled his love affairs to his family members frustrated his will because of a bastard son. It is the model of situations, Kim Nan-cheon intended to describe, that Homo Economicus became an object of envy among people in early modern society as well as the choice has been hard in conflicting between family and lover, concretizing anachronism through history of family.

• Microbiology and Biotechnology Letters
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• v.25 no.4
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• pp.427-433
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• 1997

Sludge Returned CMAS process was applied to treat the wastewater from electric accessory manufacturing company while this type of wastewater was usually treated by chemical process. This result show that the removal rate of TCOD was about 70-80% regardless of hydraulic retention time, On the contrary, the removal rate of BOD was abtained in a range of 77-92% depending on hydraulic retention time. In order to remove more than 80% of organic materials with the proposed process, the F/M ratio should be maintained below 0.17. In this case, the calculated value of organic removal rate, Km, was calculated to be 1.26 hr$^{-1}$, and the ratio of cell synthesis/total energy was 0.32 and 0.26 for COD and BOD base, respectively. The yield coefficient was calculated to be 0.242 and the half velocity coefficient was 0.3 hr$^{-1}$. The value of endogenous respiration coefficient was 0.02 hr$^{-1}$. The measured effluent BOD concentration, MLSS concentration in aeration tank, oxygen uptake rate, and sludge production were matched relatively well with the calculated values using above coefficients, In order to optimize the dewatering of sludge, the hydraulic retention time was recommended to be 15. 6 hrs. These results indicate that the wastewater from an eletric accessory manufacturing company can be treated safely with a biological process.

• Korean Journal of Agricultural Science
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• v.34 no.2
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• pp.181-188
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• 2007

This study was conducted to estimate the humificating grade according to experiment of physico-chemical characterization and phyto-toxicity during composting of using with pig manure and castor meal. The material ratios of the compost which was mixed with pig manure(P), castor meal(C), and saw dust(S) were 5 : 1 : 4(PCS-I), 5 : 2.5 : 2.5(PCS-II) and 5 : 4 : 1(PCS-III) by volume to volume, and they were decomposed for 60 days. In the result, the changes of temperature in all treatments during composting were rapidly increased more than $68^{\circ}C$ at the incipient stage, and gradually decreased within $39^{\circ}C$ at 60 days the after treatment. pH was slowly increased from 7.5 to 7.7, and the C/N ratio was 13~14 at the final composting stage. The low C/N ratio value in this compost was caused by the castor meal contented high nitrogen level(T-N 5.7 %). G.I.(germination index) was showed 73 to 78 range in all treatments at the $60^{th}$ day. Among all treatments PCS-I was appeared to be the best condition for composting.

• Journal of the Korea Organic Resources Recycling Association
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• v.14 no.2
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• pp.83-90
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• 2006

The NaCl contents of food waste composts made by various techniques known up to now were under the level of 1% by fresh weight basis. But these techniques has some problem that is environment pollution from treated water and high equipment cost. The application to agricultural land of food waste compost that is not sufficiently removed NaCl was considered to be improper due to salt accumulation in soils and plant growth inhibition by salt stress. The purpose of this study is to decompose NaCl in food waste compost using triple salt and this method is differ from existing chemical method. Also, reaction of NaCl with triple salt produced KCl that is basic material of potassium fertilizer. Moreover Also, there was temperature rise of average $5^{\circ}C$ as result that apply triple salt in food waste 600 ton in food wast composting productive capacity. Obvious odious smell reduction effect appeared pretreatment process and fermentation process with temperature rise and this is because triple salt activation of aerobe and removes odious smell cause material by salt content decrease effectively.