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최선미,김진만,구자술 한국자원리싸이클링학회 2021 資源 리싸이클링 Vol.30 No.1
Ladle furnace slag is a byproduct of the steel-making process, and it contains the mineral β-C2Sandtherapid-settingmineral (dependingonwhichreducingagenthasbeenused). Ladle furnace slag is often treated through slow cooling, which causes the slag to lose its reactivity. In this study, the properties of air-quenched CAC and pulverized ladle furnace slag containing gypsum were evaluated, and the optimal mixing ratio was determined for broadening their usage. Consequently, the properties of CAC aredemonstrated by the dissolution of gypsum after a period of three hours and the content of gypsum after a period of one day. The optimal mixing ratio of anhydrate and hemihydrate gypsum is found to be within 30% and that of dihydrate gypsum is found to be higher than 35%. Furthermore, based on the results of CAC with dihydrate gypsum, the applicability of the by-product dihydrate gypsum has been verified. 조강 생산 시 발생되는 슬래그는 대부분 서냉 방식에 의해 처리되고 있다. 하지만 슬래그 중 일부는 속경성 광물을 포함하고 있음에도 불구하고, 서냉 방식에 의해 그 반응성을 상실하게 된다. 이에 본 연구에서는 제강환원슬래그를 SAT공법에 의하여 공기 급냉하여선별 및 분급 후 분쇄한 CAC의 활용성 확대를 목적으로 석고 종류 및 혼입율에 따른 CAC의 특성에 관하여 고찰하였다. 그 결과, CAC 는 3시간에서는 석고 용해도, 1일 이후에는 석고 함량비에 따라 특성이 나타나는 것을 확인하였다. 반수, 무수석고의 적정 혼입율은30% 이내, 이수석고는 35% 이상인 것을 확인하였으며, 이수석고의 혼입율 및 특성 확인을 통하여 부산이수석고의 적용 가능성을 확인하였다.
고령층의 디지털화와 사회자본, 삶의 만족도간의 관계 분석:지역수준의 조절효과를 중심으로
최선미 서울행정학회 2023 한국사회와 행정연구 Vol.34 No.2
This study analyzed the impact of the digital capabilities and access frequency of the elderly on social capital and life satisfaction. The results are as follows. First, the higher the digital capability, the higher the frequency of access, the higher the social capital. Second, the higher the digital competency, the higher the SNS utilization, the higher the satisfaction of life. Third, as a result of analyzing the moderating effect of regional variables, it was found that the impact of digital capabilities on social capital weakened in cities. Through this, policy implications strengthening of information access and activity capabilities of the elderly to converge the digital gap within generations.
겨우살이 첨가 김치의 발효양상과 항돌연변이 및 암세포성장저해효과
최선미,길정하,전영수,박건영 부산대학교 김치연구소 2003 김치의 과학과 기술 Vol.9 No.-
Fermentation characteristics, and antimutagenic and anticancer effects of mistletoe added kimchi were studied. The changes in pH, acidity and the value of prevalence test of the mistletoe added kimchi during the fermentation were determined. Ames antimutagenicity test against aflatoxin B_(1) (AFB_(1)) and N-methyl-N'nitro-N-nitrosoguanidine (MNNG) in Salmonella typhimurium TA100, and MTT assay using HT-29 human colon carcinoma cells and AGS human gastric adenocarcinoma cells were employed to test the chemopreventive effect of the kimchis. Mistletoe added kimchis were fermented at 15℃ for 1 days and then ripened at 5℃ to reach optimum pH of 4.3. Mistletoe added kimchis fermented slowly compared to the control kimchi when the changes of pH and acidity of the kimchis were compared. Sour flavor of mistletoe in the kimchis was decreased during the fermentation. Mistletoe added kimchis exhibited higher inhibitory effect against the mutagenicities induced by AFB_(1) and MNNG in the Ames test than the control kimchi. Especially, 2% mistletoe added kimchi showed the highest inhibitory effect (75%, 68%) in the Ames test (p<0.05), Two % mistletoe added kimchi showed the highest anticancer effect against HT-29 human colon cells (p<0.05). Mistletoe added kimchis exhibited significantly higher anticancer effect than the control kimchi in AGS cells, too, however, there was no significant different effect among the different levels of mistletoe (0.5∼2.0%) addition (p<0.05). It can be concluded that addition of mistletoe in kimchi increased preservation period of the kimchi and enhanced antimutagenic and anticancer effects of the kimchi.