• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.673-677
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• 2009

현재 상수시설의 경우 갈수록 악화되는 수질과 정수장의 유지관리 인원 상주의 어려움, 기존의 응집, 침전, 여과 정수처리 시스템의 처리성능 증대에 따른 한계성에 직면한 상황이다. 안정적으로 수질의 개선을 통한 장치의 컴팩트화, 유지관리가 편리한 고도정수 수질기준에 만족하는 정수처리 시스템이 필요하다. 본 연구에서는 기존의 정수처리 시설인 혼화지에 응집제와 함께 다양한 비중을 가지고 있는 모래입자를 투입하여 응집제와 모래의 결합에 따른 탁도 제거효율과 슬러지의 양을 비교하였으며, 침전지내에 정류벽을 설치하여 침전지 초반에 가라앉을 수 있도록 유도하여 탁도 및 슬러지양을 비교하였다. 응집제만 투입한 경우보다 시료를 투입한 경우가 탁도제거율과 슬러지양이 상승하는 것을 볼 수 있으며 그중에서도 규사의 경우가 가장 많은 탁도제거율의 상승을 나타냈다. 또한 이중 정류벽을 설치하여 탁도 및 슬러지양을 측정한 결과 이중정류벽을 설치하지 않은 경우보다 탁도제거율 및 슬러지양 또한 높게 측정되었으며 슬러지의 양 또한 침전지 앞부분에 집중되는 것으로 나타났다. 이러한 경우 상기 플럭의 질량이 증가하기 때문에 처리속도를 높이고, 체류시간을 줄이고, 처리를 효율적으로 안정되게 수행하는 것이 가능하다. 본 연구결과를 바탕으로 정수시설의 설치에 있어 시료와 이중정류벽을 함께 사용할 경우 응집제의 절감 또는 침전지의 컴팩트화를 가져올 것으로 예상된다.

• 수도
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• v.27 no.1 s.91
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• pp.34-47
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• 2001

• Horticultural Science & Technology
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• v.16 no.2
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• pp.244-246
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• 1998

This study was carried out to investigate the effects of plant growth regulators on the growth and development of pot 'Pinto Rose' and 'Pinto Scarlet' geraniums. Plant height was increased by $GA_3$ treatments in both 'Pinto Rose' and 'Pinto Scarlet' geranium. However, the number of branches was not affected by $GA_3$ and daminozide treatments. The combined treatments of $GA_3$ and daminozide delayed the days to first flowering in 'Pinto Scarlet' geranium. Also, in 'Pinto Rose', $GA_3$ or the combination of $GA_3$ and daminozide treatments delayed the first flowering time. 'Pinto Scarlet' geranium was more sensitive to growth regulator treatments than 'Pinto Rose'. The number of flower stalks and branches were increased by uniconazole in 'Pinto Scarlet', while the flower stalk length and canopy diameter were severely decreased by uniconazole treatments in both cultivars. The days to first flowering tended to be delayed by all growth retardant treatments in geranium.

• Weed & Turfgrass Science
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• v.5 no.4
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• pp.213-218
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• 2016

Timely application and the choice of herbicides are crucial for red pepper production since the yield is significantly reduced by weed occurrence. Experiments were conducted to provide efficient weed control methods in red-pepper fields. The results suggest the followings: 1) in the field of prevalent grass weeds, application of pendimethalin EC as pre-emergence herbicide after transplanting followed by tank-mix with pendimethalin and fluazipfop-P-butyl EC as post-emergence at 3-5 leaf stage of Digitalia species gave a good control for 80 days without crop injury, 2) as for grass and other weeds occurrence, sequential application of tank-mix with glufosinate-ammonium SL and pendimethalin at 30 days after transplanting (DAT) followed by glufosinate-ammonium. at < 20 cm of weed height with 30 days' interval provided better weed control than 2-time application of glufosinate-ammonium. single application for 80 days in this trial. 3) To prevent from drifting of non-selective herbicide spray mist into red-pepper at furrow application, glufosinate-ammonium. should be applied at 15 cm of spray nozzle height at 20 DAT (18 cm tall of red pepper), and the spray nozzle should be placed below 30 cm above ground to keep spray drift minimum to red pepper with > 40 cm plant height at 40 DAT.

• Journal of Korean Society of Environmental Engineers
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• v.37 no.6
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• pp.340-348
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• 2015

Removal efficiency of PCBs in contaminated marine sediments treated by Fenton-like oxidation combined with surfactant was investigated in this research in order to achieve remediation of PCBs. A washing treatment using various concentrations of hydrogen peroxide (1% and 15%) and surfactants (Triton X-100, Tween 60 and Tween 80) was evaluated at various conditions in laboratory scale experiments. The mean removal efficiencies of tPCBs varied from 24.1 to 46.7% in the sediments for 1 hour duration of the treatments. The concentration of tPCBs in contaminated marine sediments after the simultaneous treatment with hydrogen peroxide and surfactant satisfied the domestic environmental standards for the beneficial use of sediments. When suitable surfactant was used for Fenton-like oxidation, the removal efficiency of tPCBs at low concentration of hydrogen peroxide was similar to that at high hydrogen peroxide concentration. Thus the efficient removal of PCBs in contaminated marine sediments could be achieved through treatment with Fenton-like oxidation combined with surfactant washing.

• Proceedings of the Korean Society of Dyers and Finishers Conference
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• 2008.10a
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• pp.153-154
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• 2008

양모 섬유를 Black 또는 Navy와 같은 농색의 염료를 사용하여 염색할 경우, 양모 표면의 스케일에 의한 빛의 난반사로 심색성이 저하되는 문제점이 있다. 또한 양모의 소수성으로 인해 심색제의 균일한 처리가 어렵다. 본 연구에서는 양모의 심색 처리 방법과 심색제를 달리하여 심색성 증진에 미치는 영향에 대해 알아보았다. 연구 결과, 입자 크기가 작은 심색제의 경우에는 비연속처리하는 방법이, 입자크기가 큰 심색제는 연속처리하는 방법이 심색성 증진에 적합함을 확인할 수 있었다.

• Environmental engineer
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• s.115
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• pp.43-45
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• 1996

강력한 오존 발생기에서 나오는 4.6$\%$의 오존이 액체에 주어졌을 때 처음 반응은 오존이 산소분자와 원자로 분열을 일으키고 산소 발생기로 접어들게 함으로써 산화물을 촉진케 하는 불소를 능가하는 단 하난의 음전성의 산화가능성을 가진 것이기 때문에 오존은 거의 모든 유기성 화합물을 공격할 수 있는 자연이 준 강력한 산화제이며 만능의 처리제인 것이다.

• Proceedings of the Korean Society for Food Science of Animal Resources Conference
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• 2005.10a
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• pp.193-195
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• 2005

본 실험은 ISP, CSP의 대체제로서의 wheat fiber첨가가 meat batter의 품질에 미치는 영향을 조사하였다. Meat batter에서 control은 처리구와 비교하여 가열감량, 보수력, 유화안정성, 물성, 점도에서 유의적인 차이가 있었다. Meat batter에 wheat fiber를 첨가하였을 경우, ISP, CSP를 첨가한 처리구와 비교하여 pH, 보수력, 육색, 유화안정성, springiness, cohesiveness는 유의적인 차이가 나타나지 않았으며, 가열감량과 점도, hardness는 다른 첨가제와 비교하여 wheat fiber가 유의적으로 낮은 결과를 나타내었다. 이상의 결과 ISP, CSP의 대체제로 wheat fiber를 첨가한다면 meat batter의 품질에 영향을 주지 않으며, 경제적인 측면에서 제품의 단가를 절감할 수 있을 것으로 생각된다.

• Korean Journal of Food Science and Technology
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• v.40 no.6
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• pp.712-716
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• 2008

In an effort to evaluate Salmonella food safety using combinations of preservation techniques, its viabilities when exposed to HCl, acetic acid, and the oxidative agents (hydrogen peroxide and butyl hydrogen peroxide), were analyzed using sub-lethal heat-shocked Salmonella Typhimurium at $56^{\circ}C$. 2D gel electrophoresis and MALDI-TOF MS analyses were also conducted to determine the expression and repression of proteins in heat-shocked cells. Heat-shocked S. Typhimurium evidenced a reduction of viable counts by 1-2 log CFU/mL. However, viality of non heat-shocked S. Typhimurium decreased markedly by 5-6 log CFU/mL at a pH 4 in response to acid and oxidative stresses. Sub-lethal heat treatment greatly increased the resistance of S. Typhimurium against acid and oxidant agents. As for 2D gel electrophoresis and protein identification via MALDI-TOF MS, 17 major proteins in non heat-shocked S. Typhimurium were detected, and only 13 proteins among these proteins were detected in heat-shocked S. Typhimurium. The heat shock proteins such as DnaK and small heat shock proteins were included, and may be associated with the resistance of S. typhimurium against exposure to acids and oxidants. Therefore, even though the promising hurdle technology using the combined mild treatments including heat was applied to S. Typhimurium, the proper heat treatment to reduce its crossprotection activity toward the following preservative agents might be considered.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.30 no.4
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• pp.471-480
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• 1985

Recently several synthetic chemicals inhibiting biosynthesis of gibberellic acids were found to be effective in preventing cereal crops from lodging by reducing culm length. The present study aimed to clarify the extent of practical manipulation of the culm length of the rice crop by changing the endogenous level of gibberellic acids with exogenous application of GA$_3$ or GA biosynthesis inhibitor. Three rice cultivars, 'Jinheung', 'Minehikari' (Japonica) and 'Hangangchal' (semi-dwarf Indica x Japonica) were treated with GA$_3$ (0, 20, 50 and 100 ppm solution) and an anti-gibberellin, paclobutrazol (0, 100, 200 and 300 g ai/ha) at three growth stages (maximum tillering, panicle initiation and meiotic stage), respectively. The application of GA$_3$ (50, 100 ppm) at maximum tillering stage and panicle initiation stage promoted the elongation of the 5th internodes from the top and GA$_3$ applied at meiotic stage promoted remarkably the elongation of the 3rd internodes. Culm was most elongated when GA$_3$ was applied at maximum tillering stage in 'Jinheung', at panicle initiation stage in 'Minehikari' and at meiotic stage in 'Hangangchal'. Paclobutrazol shortened the 4th and 5th internodes from the top when it was applied at maximum tillering stage and panicle initiation stage and the 2nd and 3rd internodes when it was applied at meiotic stage in the three cultivars. The semi-dwarf Indica x Japonica variety responded to a greater extent to the GA$_3$ and to a less extent to the anti-gib berellin than the Japonica varieties. The effect of GA$_3$ and paclobutrazol on the panicle length and the number of spikelets per panicle varied with time and dose of their application as well as with variety.