• The Korean Journal of Ecology
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• 제26권3호
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• pp.135-142
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• 2003

콩과식물의 염분 내성에 대한 질소원의 영향을 규명하기 위하여 4종 콩과식물을 선택하여 100 mM까지의 NaCl을 처리하였다. 염-민감성 종으로 알려진 대두와 팥은 염분 농도가 증가함에 따라 총 질소 함량이 점차 감소하는 반면, 아미노산 함량은 현저히 증가(100 mM NaCl 처리된 대두 무질소구의 경우 대조구의 4.7배)하여 높은 가용성/불용성 질소 비를 보였다. 대조적으로 염분 내성을 보이는 긴강남차와 자귀나무는 아미노산을 거의 함유하지 않았으며, 염 구배에 따라 총 질소 함량(특히 불용성 질소)이 점차 증가하는 양상을 보였다. 대두와 팥은 아미노산 중 asparagine (Asn)을 다량으로 함유하였으며, Asn은 이들 식물의 대표적인 질소의 수송 및 저장형태로서 염분 환경하에서 이들 식물의 세포질 내 삼투조절에 관여하는 것으로 생각된다. 염 환경에서 대두의 생장에 대한 질소원 및 농도의 영향은 5 mM NH₄NO₃-N 처리구에서 가장 높은 건물함량(10mM NaCl 처리구의 지상부건물함량의 경우 대조구의 약 1.5배)을 보였고, NH₄-N을 공급한 식물의 경우 질소를 공급하지 않은 대조구보다 생장이 저해되었으며, 처리 15일 이후 40과 80 mM NaCl 처리구에서 모두 고사하였다. 따라서 대두의 생장은 NH₄-N, 대조구, NO₃-N, NH₄NO₃-N의 순으로 질소공급량이 증가할수록 염에 대한 저항성이 증가하는 것으로 나타났다.

• 방사선산업학회지
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• 제5권3호
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• pp.211-220
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• 2011

This study was carried out to develop salt tolerant varities of rapeseed (Brassica napus L.) which can be grown in the high salty reclaimed land. The seeds of three varieties 'Naehan', 'Tammi', and 'Halla' were treated by proton ion beams and gamma rays with 0 to 2,000 Gy. For the selection of salt tolerant lines, emergence and survival rate, and growth characteristics of $M_2$ to $M_4$ generations were investigated in the Saemangeum reclaimed fields with the different salt concentrations. The lines with potential salt tolerance were selected in the $M_4$ generation and tested indoor for their growth characteristics. There was no significant changes in the soil pH for $M_4$ generation during growth period. However, soil EC was higher in early spring than sowing period (mid October). In $M_4$ generation test, the seeds of original and selected line showed high rates of emergence and survival, as determined one month after sowing. After wintering, however, the original varieties showed the significant reduction in the survival rate, while the selected lines showed a higher survival rate and good growth, leading to the completion of their life cycle. Consequently we selected 9 lines from $M_4$ generation with better performance in growth and yield. Soil EC was $2.8{\sim}4.3dS{\cdot}m^{-1}$ during $M_4$ generation growth period. The laboratory test of the lines selected from $M_4$ generation was made for their salt tolerance potential. The selected lines showed higher chlorophyll and proline contents than the original varieties. There was also no significant difference in the emergence rate of seed between the original and selected varieties. In 200 mM natural sea salt, the $N{\gamma}600-21-1-641$ line derived from 'Naehan' was the highest in growth rate, leaf chlorophyll and proline contents. $T{\gamma}800-20-2-461$ line derived from 'Tammi' didn't show significant difference in growth rate compared to original variety in 200 mM and withered in 250 mM like other lines as time passed. $H{\gamma}200-7-1-740$ line showed similar growth and chlorophyll content compared to its original variety.

• 한국해양생명과학회지
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• 제6권2호
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• pp.80-87
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• 2021

본 연구에서는 과불화합물 PFOA와 PFOS potassium salt가 Mesocentrotus nudus의 10 min-수정률과 48 h-정상유생발생률에 미치는 독성영향을 반수영향농도, 무영향농도, 최소영향농도 등의 독성값 계산을 통해 확인하였다. PFOA와 PFOS potassium salt에 대한 10 min-수정률의 EC₅₀ 값은 각각 1346.43 mg/l와 536.18 mg/l로 나타났으며, 48 h-정상유생발생률의 EC₅₀ 값은 각각 42.67 mg/l와 17.81 mg/l로 나타났다. 최근 연구에 의하면, 환경 내의 PFOA와 PFOS의 농도는 지속적으로 감소하였으며, 성게류에게 급성독성을 나타낼 정도는 아닌 것으로 나타났다. 하지만 생물체내에서는 여전히 높은 농도로 관측되고 있다. 결국, PFOA와 PFOS는 생물체의 생애전주기에 걸쳐 체내 축적이 가능하기 때문에, 연안환경에 서식하는 해양생물을 이용한 생애전주기적 만성독성 연구가 필요할 것이다.

• 한국식품영양학회지
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• 제11권4호
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• pp.444-451
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• 1998

The changes of amine, nitrate and nitrite nitrogen in yellow corvenia were studied during its processing and storage in order to clarify the precursors of N-nitrosamine(NA) formation in the salted and dried yellow corvenia(Gulbi), prepared y using the different salting method like dry and brine salting by pure and curde salt. As a result, during the processing and storage of Gulbi, DMA and TMA contents were significantly increased in the yellow corvenia. And after 40 days storage the increase rate showed 25.7∼45.7, 3.3∼5.6 times higher than those of 0.3, 2.4mg/kg, respectively, while nitrite contents, during its processing and storage, were scarcely changed in the salted and dried yellow corvenia. During the processing and storage, of Gulbi, DMA and TMA contents were less produced in brine salted and dried yellow corvenia using crude salt than in sample prepared using were scarcely changed in the salted and dried yellow corvenia. During the processing and storage of Gulbi, DMA and TMA contents were less produced in brine salted and dried yellow corvenia using crude salt than in sample prepared using pure salt, while the former were more effective than the latter in inhibiting the production of nitrate and nitrite. Therefore, it was revealed that reduction of NA precursors such as DMA, TMA, nitrate and nitrite were more effective in preparing with the brine salting method than with the dry salting method.

• 한국정보통신학회논문지
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• 제19권4호
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• pp.965-972
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• 2015

현재 디지털 시대의 급속 발전과 함께 영상 매체는 인터넷, 컴퓨터, 디지털 카메라 등에 활용되고 있다. 그러나 디지털 영상을 획득, 처리, 전송, 기록하는 과정에서 여러 외부 원인에 의해 영상의 열화가 발생되며, 영상 열화의 주된 원인은 잡음에 의한 것으로 알려져 있다. 따라서 본 논문에서는 salt & pepper 잡음을 제거하기 위해 잡음 판단 후, 비잡음인 경우 원 화소로 대치하고, 잡음인 경우 Lagrange 보간법으로 처리하는 알고리즘을 제안하였다. 고밀도 잡음이 첨가되어 잡음제거가 불가능한 경우, 반복 처리하여 잡음 제거 특성을 향상시켰다. 그리고 객관적 판단을 위해 기존의 방법들과 비교하였으며, 판단의 기준으로 PSNR(peak signal to noise ratio)을 사용하였다.

• 한국재료학회지
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• 제16권9호
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• pp.557-563
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• 2006

The electrolytic reduction of spent oxide fuel involves the liberation of oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is too corrosive for typical structural materials. So, it is essential to choose the optimum material for the process equipment handling molten salt. In this study, corrosion behavior of Inconel 713LC, MA 754, X-750 and 718 in the molten salt $LiCl-Li_2O$ under an oxidizing atmosphere was investigated at $650^{\circ}C$ for $72{\sim}216$ hours. Inconel 713LC alloy showed the highest corrosion resistance among the examined alloys. Corrosion products of Inconel 713LC were $Cr_2O_3,\;NiCr_2O_4$ and NiO, and those of Inconel MA 754 were $Cr_2O_3\;and\;Li_2Ni_8O_{10}$ while $Cr_2O_3,\;NiFe_2O_4\;and\;CrNbO_4$ were produced from Inconel 718. Also, corrosion products of Inconel X-750 were found to be $Cr_2O_3,\;NiFe_2O_4\;and\;(Cr,Nb,Ti)O_2$. Inconel 713LC showed local corrosion behavior and Inconel MA 754, 718, X-750 showed uniform corrosion behavior.

• Journal of Microbiology and Biotechnology
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• 제20권11호
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• pp.1577-1584
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• 2010

In total, 140 halotolerant bacterial strains were isolated from both the soil of barren fields and the rhizosphere of six naturally growing halophytic plants in the vicinity of the Yellow Sea, near the city of Incheon in the Republic of Korea. All of these strains were characterized for multiple plant growth promoting traits, such as the production of indole acetic acid (IAA), nitrogen fixation, phosphorus (P) and zinc (Zn) solubilization, thiosulfate ($S_2O_3$) oxidation, the production of ammonia ($NH_3$), and the production of extracellular hydrolytic enzymes such as protease, chitinase, pectinase, cellulase, and lipase under in vitro conditions. From the original 140 strains tested, on the basis of the latter tests for plant growth promotional activity, 36 were selected for further examination. These 36 halotolerant bacterial strains were then tested for 1-aminocyclopropane-1-carboxylic acid (ACC) deaminase activity. Twenty-five of these were found to be positive, and to be exhibiting significantly varying levels of activity. 16S rRNA gene sequencing analyses of the 36 halotolerant strains showed that they belong to 10 different bacterial genera: Bacillus, Brevibacterium, Planococcus, Zhihengliuella, Halomonas, Exiguobacterium, Oceanimonas, Corynebacterium, Arthrobacter, and Micrococcus. Inoculation of the 14 halotolerant bacterial strains to ameliorate salt stress (150 mM NaCl) in canola plants produced an increase in root length of between 5.2% and 47.8%, and dry weight of between 16.2% and 43%, in comparison with the uninoculated positive controls. In particular, three of the bacteria, Brevibacterium epidermidis RS15, Micrococcus yunnanensis RS222, and Bacillus aryabhattai RS341, all showed more than 40% increase in root elongation and dry weight when compared with uninoculated salt-stressed canola seedlings. These results indicate that certain halotolerant bacteria, isolated from coastal soils, have a real potential to enhance plant growth under saline stress, through the reduction of ethylene production via ACC deaminase activity.

• 한국방사성폐기물학회:학술대회논문집
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• 한국방사성폐기물학회 2003년도 가을 학술논문집
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• pp.180-185
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• 2003

원자력연구소에서 개발 중인 현재의 건식처리공정에서 발생될 용융염폐기물로 인한 최종 고화체의 발생량을 재생/재순환 공정을 도입할 경우와 비교하여 최종 고화체 발생량 감소와 이로 인한 재료비 절감액을 계산하였다. 현재까지 확보된 자료와 가정 하에 계산한 결과 1 ton HM을 처리하는 것을 기준으로 차세대관리공정 발생 LiCl염폐기물의 최종 고화체는 5.4 톤에서 1.7 톤으로 약 3.7 톤 (부피로는 $1.6m^3$) 줄게 되고, 1 ton U 규모의 전해정련공정 발생 LiCl-KCl 공융염폐기물의 최종 고화체는 2.7 톤에서 0.4 톤으로 약 2.3 톤 (부피로는 $1.0m^3$)이 줄어드는 것으로 계산되었다. 본 추정으로부터 건식처리공정이 보다 더 경제성을 높이기 위해서는 재생처리공정의 도입이 꼭 필요한 것으로 판단되었다.

• 방사성폐기물학회지
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• 제7권2호
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• pp.73-78
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• 2009

사용후핵연료 파이로프로세싱의 전해환원 공정에서 발생하는 LiCl 염폐기물내 Cs과 Sr의 방사능 붕괴열을 계산하였다. 계산시 대부분의 LiCl염폐기물을 재생하여 재활용하고 나머지를 고화체로 만든다고 가정하였다. 계산결과 Cs 및 Sr의 붕괴로 생성되는 자핵종인 Ba와 Y에 의한 열발생량이 모핵종에 비해 최대 4.6배 더 많았다. LiCl염폐기물내 Cs 및 Sr에 의한 열발생은 초기 한달 정도에 최대이므로 일정 기간 초기 LiCl염폐기물의 온도 급상승을 제어할 냉각설비의 운영이 바람직할 것으로 보인다.

• 대한금속재료학회지
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• 제46권9호
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• pp.577-584
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• 2008

The electrolytic reduction of spent oxide fuel involves the liberation of oxygen in a molten LiCl electrolyte, which results in a chemically aggressive environment that is too corrosive for typical structural materials. So, it is essential to choose the optimum material for the process equipment handling molten salt. In this study, corrosion behavior of Inconel 713LC, Inconel MA 754, Nimonic 80A and Nimonic 90 in the molten salt $LiCl-Li_2O$ under an oxidizing atmosphere was investigated at $650^{\circ}C$ for 72~216 hrs. Inconel 713LC alloy showed the highest corrosion resistance among the examined alloys. Corrosion products of Inconel 713LC were $Cr_2O_3$, $NiCr_2O_4$ and NiO, and those of Inconel MA 754 were $Cr_2O_3$ and $Li_2Ni_8O_{10}$ while $Cr_2O_3$, $LiFeO_2$, $(Cr,Ti)_2O_3$ and $Li_2Ni_8O_{10}$ were produced from Nimonic 80A. Also, corrosion products of Nimonic 90 were found to be $Cr_2O_3$, $(Cr,Ti)_2O_3$, $LiAlO_2$ and $CoCr_2O_4$. Inconel 713LC showed local corrosion behavior and Inconel MA 754, Nimonic 80A, Nimonic 90 showed uniform corrosion behavior.