• 한국구조물진단유지관리공학회 논문집
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• 제27권5호
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• pp.16-22
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• 2023

이 연구는 원전 콘크리트 배합설계를 모사한 콘크리트 시험체에 대하여 염수침지 실험을 수행하였으며, 시험체 깊이에 따른 염화물량과 XRF 성분의 상관관계를 분석하였다. 원전 콘크리트의 표면부의 염화물량은 염수 침지기간이 증가함에 따라 소폭 증가하였으나, 깊이 5.5 mm 이상의 콘크리트 시험체 내부 염화물량은 염수 침지기간이 증가함에 증가하는 경향이 뚜렷하게 나타났다. 콘크리트의 염화물량과 XRF 성분의 상관관계 분석결과, OPC 배합과 비교하여 FA가 20% 치환된 배합은 XRF 성분분석을 통한 Cl 이온의 구성비율과 염해저항성 평가결과의 상관관계가 매우 높게 나타났다. 이에 따라 FA가 20% 치환된 원전 콘크리트 배합에서는 반복적인 데이터 누적을 통해 XRF 성분분석을 통하여 염소이온분석 및 염해저항성능 평가가 가능함을 확인하였다.

• Annals of Clinical Neurophysiology
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• 제24권1호
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• pp.30-34
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• 2022

In cases of hyponatremia induced by brain damage, it is important to distinguish between the syndrome of inappropriate anti-diuretic hormone secretion (SIADH) and cerebral salt wasting syndrome. A ventriculoperitoneal (VP) shunt is the standard treatment for hydrocephalus, and external lumbar drainage (ELD) is an option to evaluate the effect of a VP shunt. However, ELD has potential complications, such as subarachnoid hemorrhage, meningitis, and rarely hyponatremia. Therefore, we report a case of a patient with cerebral salt-wasting syndrome resulting from ELD to treat normal-pressure hydrocephalus during the rehabilitation of acute ischemic stroke.

• Journal of Crop Science and Biotechnology
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• 제10권1호
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• pp.39-44
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• 2007

The effect of inabenfide was investigated in rice seedlings subjected to salt stress in relation to changes in chlorophyll fluorescence(${\Delta}F/Fm'$), lipid peroxidation, salicylic acid(SA) content, and catalase(CAT) activity. A reduction in shoot growth of rice seedlings by 120 mM NaCl treatment was significantly alleviated by pretreatment with 30 ${\mu}M$ inabenfide. Sodium ion content was not affected by pretreatment with inabenfide, suggesting that alleviation was not due to a reduction in sodium ion uptake by the rice seedlings. At three days after NaCl treatment, the rice seedlings pretreated with inabenfide showed a higher ${\Delta}F/Fm'$(30%) and lower lipid peroxidation(28%) compared with the rice seedlings treated with NaCl alone. After NaCl treatment, CAT activity in the third leaf of rice seedlings decreased significantly but alleviated by pretreatment with inabenfide. Furthermore, pretreatment with inabenfide also reduced the level of SA which accumulated drastically in the third leaf of rice seedlings within a day after exposure to salt stress. These results suggest that inabenfide prevents SA accumulation in rice seedlings under salt stress which eventually induces the alleviation of salt stress damage.

• 융합신호처리학회논문지
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• 제20권3호
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• pp.165-170
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• 2019

최근 현대 사회는 다양한 영상시스템이 발전함에 따라 영상처리의 중요성이 대두되고 있다. 하지만 영상데이터를 전송, 처리, 저장 하는 과정에서 다양한 이유로 열화가 발생하게 된다. 열화는 원 영상을 훼손하게 되며, 대표적인 잡음으로는 Salt and Pepper 잡음이 있다. 이러한 잡음을 제거하기 위한 방법으로 A-TMF, CWMF, 선형보간법 등이 있다. 하지만 이러한 방법들은 고밀도 잡음 영역에서 잡음 제거 성능이 다소 미흡하게 나타난다. 따라서 본 논문에서는 변형된 선형보간법을 이용하여 잡음을 제거하는 알고리즘을 제안한다. 제안한 알고리즘의 타당성을 증명하기 위해서 PSNR, 프로파일 등을 사용하여 기존의 방법의 알고리즘들과 비교하였다.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2006년도 춘계학술발표회 논문집(I)
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• pp.574-577
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• 2006

Recently, the deterioration due to salt damage and carbonation as the main factors of deteriaoration of the domestic reinforced concrete structures has been increased. Also the national and social concern about the durability recovery of the deteriorated reinforced concrete structures is geratly being raised. Therefore, it is the final purposes of this study to develop the performance evaluation technique for durability of reinforced concrete structures deteriorated due to salt damage and carbonation with the proposal of the service life prediction method for the investigation and diagnosis of reinforced concrete structures, and accelerated test in Lab.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1996년도 봄 학술발표회 논문집
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• pp.414-417
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• 1996

It is the aim of this study to introduce the performance and application of new repair system for the exterior wall by durability failure caused carbonation and salt damage. The elementary performance of this repair system is as follows. (1) Al the layer in the repair are cement based, same with the mother concrete (2) this repair system use SBR admixture (3) This cement and mortar powder for this repair system are premixed and ready to use just adding admixture at the job site.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2013년도 추계 학술논문 발표대회
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• pp.60-61
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• 2013

For reinforced concrete structures located in a sea environment, the Impressed Current Cathodic Protection (ICCP) is mostly used as a signature method to prevent steel corrosion. For this research, specimens to which the ICCP is applied were manufactured under the assumption of two following cases the specimens are exposed to various salt damage environments (submerged zone, tidal zone), and deteriorative factors (crack) occur in concrete. For the specimens manufactured, an enhancement experiment for deterioration was conducted through regular cycle change under the temperature between 15 ~ 70℃ with 70 ~ 90% humidity. Afterwards, the method effect was verified through a half-cell method and application of the ICCP derived from salt damage environments was investigated.

• 복합신소재구조학회지
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• 제4권2호
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• pp.10-17
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• 2013

• 한국관개배수논문집
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• 제13권2호
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• pp.363-370
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• 2006

• Corrosion Science and Technology
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• 제6권4호
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• pp.177-185
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• 2007

The purpose of this study is to evaluate freezing-thawing and surface scaling resistance in order to examine the frost durability of concrete in a chloride-inherent environment. The mixing design for this study is as follows: 3 water binder ratios of 0.37, 0.42, and 0.47; 2-ingredient type concrete (50% OPC concrete and 50% ground granulated blast-furnace slag), and 3-ingredient type concrete (50% OPC concrete, 15% fly ash, and 35% ground granulated blast-furnace slag). As found in this study, the decrease of durability was much more noticeable in combined deterioration through both salt damage and frost damage than in a single deterioration through either ofthese; when using blast-furnace slag in freezing-thawing seawater, the frost durability and surface deterioration resistance was evaluated as higher than when using OPC concrete. BF 50% concrete, especially, rather than BFS35%+FA15%, had a notable effect on resistance to chloride penetration and freezing/expansion. It has been confirmed that surface deterioration can be evaluated through a quantitative analysis of scaling, calculated from concrete's underwater weight and surface-dry weight as affected by the freezing-thawing of seawater.