• Journal of Advanced Marine Engineering and Technology
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• 제36권3호
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• pp.341-350
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• 2012

In this paper we observe the protective coatings carbon for steel, aluminium and titanium alloys were obtained by plasma electrolytic oxidation (PEO) under unipolar and bipolar conditions. The anticorrosion properties and the thermal stability of the surface layers were studied by electrochemical impedance spectroscopy and potentiodynamic polarization. It was found that the application of the bipolar PEO mode enables one to synthesize the surface layers that possess enhanced anticorrosion and mechanical properties. results of research of antiscale PEO - coatings for marine power equipment are presented. The combined method of prevention of corrosion and scale formation was tested at the industrial plants of Russian Shipyard "Zvezda".

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 합동 추계학술대회 논문집 정보 및 제어부문
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• pp.537-541
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• 2002

This paper is about the development of the turbine valve actuator efficiency analysis system for the standard power plants. We developed hydraulic power unit and turbine valve actuator controller. We designed control algorithm for turbine valve actuator, implemented and verified it at the industrial plants.

• 한국산업융합학회 논문집
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• 제17권3호
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• pp.145-150
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• 2014

The purpose of this study was to evaluate the growth of lettuce last for 36 days. Lettuce planted on the same medium with different treatment. The first treatment watering using bio-fertilizer (farmer) and second watering using effective microorganism. Lettuce grown in greenhouse with temperature $18-32^{\circ}C$.Characteristic observed that growth in height and weight of the plants. From the observations that can be generated at high observation, treatment 1 had a higher than treatment 2. On the last day treatment plant with treatment 1 had a 99.8 mm high while treatment 2 has height of 90.7 mm. Observation on severe treatment 1 has a heavier weight than treatment 2. Plants with treatment 1 have a weight on the last day of 0.15665 grams while in plants with treatment 2 weights are 0.11365 grams.

• 한국환경과학회지
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• 제25권2호
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• pp.239-246
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• 2016

This study aims to analyze region-specific trends in changing greenhouse gas emissions in incineration plants of local government where waste heat generated during incineration are reused for the recent five years (2009 to 2013). The greenhouse gas generated from the incineration plants is largely $CO_2$ with a small amount of $CH_4$ and $N_2O$. Most of the incineration plants operated by local government produce steam with waste heat generated from incineration to produce electricity or reuse it for hot water/heating and resident convenience. And steam in some industrial complexes is supplied to companies who require it for obtaining resources for local government or incineration plants. All incineration plants, research targets of this study, are using LNG or diesel fuel as auxiliary fuel for incinerating wastes and some of the facilities are using LFG(Landfill Gas). The calculation of greenhouse gas generated during waste incineration was according to the Local Government's Greenhouse Emissions Calculation Guideline. As a result of calculation, the total amount of greenhouse gas released from all incineration plants for five years was about $3,174,000tCO_2eq$. To look at it by year, the biggest amount was about $877,000tCO_2eq$ in 2013. To look at it by region, Gyeonggido showed the biggest amount (about $163,000tCO_2eq$ annually) and the greenhouse gas emissions per capita was the highest in Ulsan Metropolitan City(about $154kCO_2eq$ annually). As a result of greenhouse gas emissions calculation, some incineration plants showed more emissions by heat recovery than by incineration, which rather reduced the total amount of greenhouse gas emissions. For more accurate calculation of greenhouse gas emissions in the future, input data management system needs to be improved.

• 한국자원식물학회지
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• 제29권3호
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• pp.347-354
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• 2016

The present study was performed to investigate the effects of the colchicine concentrations on chromosome doubling for producing of tetraploid plants of Codonopsis lanceolata, and its effect on plant morphology. A total of 180 individuals germinated from 16 treatment groups, were exposed to various concentrations (0.05-1.0% w/v) of colchicine for different soaking duration (3-24 hour). The highest numbers of tetraploid plants (3) were observed from the lowest concentration of colchicine (0.05%), and one (1) tetraploid plant was obtained from the 0.5% concentration group with a 6 hour treatment. However, no tetraploid individual was observed in any other treatment groups. The plant height of the diploid (18.1 ㎝) was slightly shorter than that of the tetraploid (13.4 ㎝). The fresh weight of the main root in the diploid (0.5 g) was four-fold higher than the tetraploid (2.2 g). The colchicine-treated plant regeneration rate in C. lanceolata was decreased when the plants were subjected to high concentration of colchicine. In particular, the highest number of tetraploid plants (5 and 3) was obtained from the lower concentration (0.05% and 0.1%) of colchicine for 6-hour treatment, which were a higher rate (29.4% and 30%) of regenerated tetraploid plants than other regenerated plants. As in the seed treatment result, the plant height of the diploid was significantly higher (10.4 ㎝) than tetraploid. The higher morphological changes were observed comparatively from tetraploid plants than the diploid.

• 한국환경보건학회지
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• 제37권2호
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• pp.113-123
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• 2011

Objectives: Industrial development in Korea results in a rapid increase in the number of chemicals, some of which may be responsible for toxicity to aquatic ecosystems. In addition, the types of hazardous chemicals included in industrial effluents have gradually increased. Therefore, chemical analysis alone is not enough to assess ecological effects of toxic chemicals in wastewater. Methods: In response to new regulations as whole effluent toxicity (WET) tests for effluent discharge of 15 publicly owned treatment works (POTWs) and 25 industrial effluent treatment plants in Gyeonggi-do, which will be effective from 2011, a necessity of studies emerges that investigates toxicity levels. Results: In case of the public treatment plants, none of them had exceeded the criteria for ecotoxicity. As for individual wastewater discharge facilities, on the other hand, two types were found to exceed the criteria: pulp and paper manufacturing facilities and pharmaceutical manufacturing facilities. For the pulp and paper manufacturing facilities, monitoring results could not help determine the exact toxicant identification. However, Daphnia magna inhibition effect or death was found to leave white plums, suggesting that suspended solids treated and the polymer used in coagulant dose. In case of pharmaceutical manufacturing facilities, the general water quality parameters cannot affect Daphia magna. However, conductivity and salinity can have an effect to be 14,000 ${\mu}s/cm$, 8.1‰ by salts, respectively. Toxicity Identification Evaluation (TIE) and Toxicity Reduction Evaluation (TRE) procedures results appeared to be effective for identifying toxic compounds in $Cl^{-}$ and $SO_4^{2-}$. Conclusions: It is necessary to develop control measures for water treatment chemicals and salts used for processes such as coagulation in individual wastewater discharge facilities in order to achieve the goal to protect aquatic ecosystems in public waters.

• 한국자원식물학회지
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• 제21권2호
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• pp.148-161
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• 2008

본 연구는 화악산(931m)의 관속식물 분포를 파악하기 위하여 수행되었다. 2006년 5월부터 2007년 10월까지 6회에 걸쳐 채집된 관속식물은 총 92과 248속 281종 1아종 47변종 9품종의 총 338종류로 정리되었으며, 이는 한반도의 관속식물 4,881종류의 6.9%에 해당되었다. 조사 지역에서 분포하고 있는 338종류의 식물자원 유용도를 분석한 결과 총 278종류의 자원식물로 분류되었으며, 식용자원(E)은 154종류(55.3%), 약용자원(M)은 163종류(58.6%), 관상자원(O)은 58종류(20.8%), 초지자원(P)은 91종류(32.7%), 공업원료자원(I)은 22종류(7.9%), 목재자원(T)은 9종류(3.2%)로 나타났다. 특기할만한 식물로는 한국특산식물이 9종류, 산림청 지정희귀 및 멸종위기식물이 1종류, 식물구계학적 특정식물이 21종류, 귀화식물이 19종류로서 귀화율은 5.6%, 도시화지수는 6.8%로 나타났다.

• 한국자원식물학회지
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• 제23권4호
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• pp.274-292
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• 2010

2009년 3월부터 2009년 9월까지 경상남도 양산시 일대의 관속식물 및 자원식물분포조사를 수행하였다. 본 조사를 통해 확인된 조사지역 내의 소산 관속식물은 90과 256속 376종 4아종 41변종 6품종으로 총 427분류군으로 확인되었다. 조사 지역에서 분포하고 있는 427분류군의 식물자원 유용도를 분석한 결과 식용자원식물이 167종류, 섬유용 자원식물이 6종류, 약용자원식물이 118종류, 관상용 자원식물이 52종류, 초지 자원식물이 132종류, 공업원료자원이 2종류, 염료용 자원식물이 98종류, 목재용 자원식물이 15종류, 용도가 밝혀지지 않은 식물이 101종류로 구분되었다. 이 중 식용자원, 약용자원, 초지자원, 염료용자원이 비교적 많이 분포하는 것으로 나타났다. 특기할만한 식물로는 한국 특산 관속식물이 총 16분류군, 환경부지정 특정식물종이 36분류군으로 각각 조사되었고, 귀화식물은 38분류군으로서 약 8.9%를 차지하였다. 조사지역의 식생은 비교적 양호한 편이었으나, 저지대 대부분이 농경지로 활용되며, 사찰과 많은 여가시설, 탐방객 등으로 인해 귀화식물의 분포가 빠르게 확산되고 있어 생태계의 교란이 우려되는 상황이다.

• 한국자원식물학회지
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• 제21권4호
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• pp.270-280
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• 2008

본 연구는 경북 문경시 공덕산(해발 913m, 북위 $36^{\circ}$ $46^{\prime}$ $37.5^{\prime\prime}$${\sim}$$36^{\circ}$ $43^{\prime}$ $61.0^{\prime\prime}$, 동경 $128^{\circ}$ $15^{\prime}$ $00.3^{\prime\prime}$$\sim$$128^{\circ}$ $17^{\prime}$ $57.9^{\prime\prime}$)의 관속식물 분포와 유용성을 파악하기 위하여 수행되었다. 2007년 5월부터 2007년 9월까지 총 5회에 걸쳐 채집된 관속식물은 총 86과 279속 374종 4아종 44변종 7품종의 총 429종류로 정리되었으며, 이들을 유용성에 따라 구분하면 식용 233종류, 약용 297종류, 공업용 113종류, 관상용 111종류, 용도가 밝혀지지 않은 식물 43종이었다. 특기할 만한 식물로는 한국특산식물이 5종류, 환경부지정 법적 보호식물이 1종류, 식물구계학적 특정식물이 III등급 5종류, IV등급 1종류, V등급 1종류, 귀화식물이 15종류로서 귀화율은 3.5%, 도시화지수는 5.5%로 나타났다.

• 한국산업보건학회지
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• 제5권1호
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• pp.40-47
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• 1995

We analyzed sytrene concentrations in air and in blood, mandelic acid in urine, and chromosome aberrations in peripheral lymphocytes of twenty one styrene-exposed workers in two reinforced plastic factories. In addition, in vitro testing for chromosome aberration was carried out. The dose-dependent clastogenicity of styrene was confirmed in the cultured Chinese hamster lung cell(CHL) with metabolic activation. The environmental styrene concentrations and urinary mandelic acid levels of analyzed subjects were different in two plants examined, but the exposure levels in most workers examined were lower than the permissible exposure levels. Chromosome aberrations of the styrene exposed workers showed no increase in the percentage of aberrant cells as compared with the control group. No correlation was found between the exposure levels and the frequencies of chromosome aberrations in workers.