Swelling Behavior Evaluation of Bentonite with Additives Mixture

김초롱,김주희,류원석,주창환,전한용,Kim, Cho-Rong,Kim, Joo-Hee,Lyoo, Won-Seok,Joo, Chang-Whan,Jeon, Han-Yong The Korean Fiber Society 2009 한국섬유공학회지 Vol.46 No.6

Variation of free swell index of powder and granular bentonite in distilled water were reviewed. For this, four types of additives is used such as starch (SC), sodium carboxy-methyl cellulose (SCMC), polyvinyl alcohol (PVA-Iand PVA-II), super absorbent polymer (SAP). For PVA-I and PVA-II, free swell index increased with 0.2 g addition. However, SC showed a little increase and SCMC showed higher increase. Especially for SAP addition, powder bentonite has larger free swell index to compare with granular bentonite. The sequence of contribution to free swell index of bentonite in descending order is SAP, SCMC, PVA-II, PVA-I, and SC.

여성의 화장품 소비가치에 따른 화장품 브랜드의 SNS 특성 선호도

김초롱(Cho-Rong Kim),곽태기(Tai-Gi Kwak) 한국의상디자인학회 2016 한국의상디자인학회지 Vol.18 No.3

치과위생사의 감정부조화와 직무만족도 간의 관계에서 소진의 매개효과와 조직적 지지의 조절효과

김초롱 ( Cho-rong Kim ),최준선 ( Jun-seon Choi ) 한국치위생학회 2018 한국치위생학회지 Vol.18 No.4

Objectives: The purpose of this study was to investigate the mediating effects of burnout and to identify the moderating effects of individual factors and organizational factors on the relationship between emotional dissonance and job satisfaction. Methods: This cross-sectional study included 270 dental hygienists working full-time at dental care facilities. The data on the socio-demographic characteristics, emotional dissonance, burnout, job satisfaction, and individual and organizational factors were collected. The individual (self-efficacy and ego resilience) and organizational (social support, organizational support and wage satisfaction) factors were considered as the moderating variable. For statistical analyses, t-test, one-way ANOVA and multiple linear regression were used. Results: Burnout was found to be a significant mediator on the relationship between emotional dissonance and job satisfaction(p<0.001). The variables moderating the relationship between emotional dissonance and burnout were identified as social support, organizational support and wage satisfaction (p <0.05), while the variables moderating the relationship between burnout and job satisfaction were wage satisfaction and ego resilience (p<0.05). Conclusions: To prevent the decrease in job satisfaction due to emotional dissonance, the management of dental care facilities should have a better understanding of burnout in dental hygienists, which requires individual and organizational efforts to be moderated. In addition, as organizational support has been identified as the factor mitigating the negative effects of emotional dissonance, it is highly necessary to adopt the preceptor system, improve communication systems and expand welfare policies of organizations.

저장 기간 중 생마즙, 오미자 및 오디 첨가 샐러드드레싱의 품질 특성 및 항산화능의 변화

김초롱 ( Cho Rong Kim ),임수빈 ( Su Bin Yim ),김형돈 ( Hyung Don Kim ),오혜림 ( Hye Lim Oh ),전혜련 ( Hye Lyun Jeon ),김나연 ( Na Yeon Kim ),홍윤표 ( Yoon Pyo Hong ),이지현 ( Ji Hyun Lee ),김미리 ( Mee Ree Kim ) 한국식품저장유통학회(구 한국농산물저장유통학회) 2012 한국식품저장유통학회지 Vol.19 No.6

본 연구는 항산화능이 우수한 오디, 오미자, 생마즙(0, 7, 18%)을 사용하여 개발한 고품질 샐러드드레싱의 저장(5℃, 4주) 기간 중 품질 특성 및 항산화능을 분석하였다 PH 맟 산도는 생마즙의 첨가량이 증가할수록 PH는 높아지고 산도는 낮아졌으며 저장기간에 따라 PH는 다소 증가하고 산도는 감소하였으나 그 변화 폭이 적어 품질 변화가 일어나지 않았다. 점도는 대조군은 83.2 cP로 낮았으나, 생마즙의 첨가량이 증가할수록 유의적으로 값이 증가하였으며(p<0.001) 저장기간에 따라 모든 군에서 점도가 증가하는 경향을 나타냈다. 유화안정성은 생마즙 첨가량과 상관없이 49~50의 수준으로 나타났으며 저장기간이 경과되어도 변화를 나타내지 않았다. 색도는 저장 초기 대조군에 비해 생마즙을 첨가한 실험군의 명도, 적색도, 황색도 수치가 높았으며 저장기간이 길어질수록 모든 군에서 명도, 적색도, 황색도 값이 감소하는 경향을 보였다. DPPH 라디칼소거능 IC(50) 값과 총 페놀함량을 통한 항산화성은 생마즙의 첨가량이 증가할수록 항산화성이 증가하였고, 저장기간에 따른 항산화성 저하는 관찰되지 않았다. 과산화물가는 저장 초기 1.51~1.12 meq/kg 이었으며, 생마즙 첨가량이 증가함에 따라 감소하였고, 4주 경과 후에도 큰 폭으로 증가하지 않았다. 이상의 결과로 본 실험에서 제조한 생마즙 오미자 및 오디 첨가 샐러드드레싱은 항산화성이 우수한 고품질 샐러드드레싱으로 저장(5℃, 4주)중 산패 및 품질에 큰 변화가 없어 저장성이 우수한 것으로 보여 진다. In this study, the quality characteristics and antioxidant activity of mulberry salad dressing prepared with yam juice during storage at 5℃ for four weeks were evaluated. The salad dressing was prepared with a salad base, mulberry, omija, and yam (4:4:6:1 or 4:4:6:3). Fresh yam juice was added to the salad dressing at 0, 7, and 18% levels. After four weeks storage, the pH increased whereas the acidity decreased. As the yam concentration increased, the pH increased to 3.84 and the acidity decreased to 0.14%. The Hunter color L (lightness), b (yellowness), and a (redness) values decreased over the storage period. After four weeks storage, the viscosity increased from 83.2 to 158.5 cp according to the amount of yam juice that was added. The antioxidant activity, such as the DPPH radical scavenging activity, and the total polyphenol content of the salad dressing improved as the yam concentration increased. Moreover, according to the storage time, the peroxide value did not increase. These results show that the mulberry salad dressing to which omija and fresh yam juice were added maintained its freshness with high antioxidative activity during storage.

Resveratrol과 관련 유도체 합성 및 효능에 관한 고찰

김초롱(Cho-rong Kim),이상협(Sang Hyup Lee) 대한약학회 2020 약학회지 Vol.64 No.5

Resveratrol, a type of phytoalexin found in many plants, is known to be a useful component for human health. It is found in vegetables, fruits, wines and teas, and especially in grapes. Resveratrol has been reported to have various medicinal effects, such as anti-inflammatory, anti-cancer and anti-aging effects. In particular, anti-cancer effects are believed to be achieved by suppressing the growth of cancer cells and therefore, decreasing cancer organisms. Based on this usefulness, extensive efforts to synthesize resveratrol have been continued. Some of the typical methods using Heck reaction, Perkin reaction and Wittig reaction have been reported, and further studies for improvement are still in progress. Derivative syntheses by substituting hydroxy groups of resveratrol with alkyl or halogen groups were also performed along with investigation of biological properties of the related compounds. As a result, synthesis and biological evaluation of resveratrol and its derivatives were discussed to assess and enhance the potential of resveratrol as a medicinal component and/or a dietary supplement.

숙지황 농축액 첨가 초콜릿의 품질 특성 및 항산화성

김초롱(Cho Rong Kim),박효정(Hyo Jeong Park),오혜림(Hye Lim Oh),나용근(Yong Geun Na),도은수(Eun Soo Doh),윤준화(Jun Hwa Yoon),심은경(Eun Kyung Shim),김미리(Mee Ree Kim) 동아시아식생활학회 2012 동아시아식생활학회지 Vol.22 No.4

The purpose of this study was to evaluate the quality characteristics and antioxidant activity of chocolate added with Rehmannia Radix Preparata (R. Radix Preparata) concentrate (0, 3, 6 and 9%). As the amount of R. Radix Preparata concentrate increased, water content significantly. The pH of chocolate decreased significantly as R. Radix Preparata concentrate increased, but the acidity of chocolate increased. Sugar concentration and reducing sugar contents also increased according to the amount of R. Radix Preparata concentrate. The L(lightness), a(redness) and b(yellowness) values significantly decreased as R. Radix Preparata concentrate increased. However, texture was not significantly different among the treatments. As the amount of R. Radix Preparata concentrate increased, DPPH radical scavenging and hydroxyl radical scavenging activities increased. In the results of the sensory evaluation, scores of color, taste, flavor, texture, and overall acceptability were the highest in chocolate added with 6% R. Radix Preparata concentrate. From these results, it was suggested that the optimum addition amount of R. Radix Preparata concentrate to chocolate is 6%.

Flow Characteristics Evaluation in Reactor Coolant System for Full System Decontamination of Kori-1 Nuclear Power Plant

김학수,김초롱,Kim, Hak Soo,Kim, Cho-Rong Korean Radioactive Waste Society 2018 방사성폐기물학회지 Vol.16 No.3

The Kori-1 Nuclear Power Plant (NPP), WH 2-Loop Pressurized Water Reactor (PWR) operated for approximately 40 years in Korea, was permanently ceased on June 18, 2017. To reduce worker exposure to radiation by reducing the dose rate in the system before starting main decommissioning activities, the permanently ceased Kori-1 NPP will be subjected to full system decontamination. Generally, the range of system decontamination includes Reactor Pressure Vessels (RPV), Pressurizer (PZR), Steam Generators (SG), Chemical & Volume Control System (CVCS), Residual Heat Removal System (RHRS), and Reactor Coolant System (RCS) piping. In order to decontaminate these systems and equipment in an effective manner, it is necessary to evaluate the influence of the flow characteristics in the RCS during the decontamination period. There are various methods of providing circulating flow rate to the system decontamination. In this paper, the flow characteristics in Kori-1 NPP reactor coolant according to RHR pump operation were evaluated. The evaluation results showed that system decontamination using an RHR pump was not effective at decontamination due first to impurities deposited in piping and equipment, and second to the extreme flow unbalance in the RCS caused deposition of impurities.

베트남 수자원 정보화 기반 수자원관리 의사결정지원 시스템 구축 KOICA ODA 사업 소개

김충수,김초롱,Kim, Chung-Su,Kim, Cho-Rong 한국수자원학회 2022 물과 미래(한국수자원학회지) Vol.55 No.5

실내 시공 시 손상 시험에 의한 지오그리드 전단거동 해석

김원춘,김수경,김초롱,강세구,장용채,이상덕,전한용,Jin, Yuan-Chun,Kim, Su-Kyung,Kim, Cho-Rong,Kang, Se-Gu,Chang, Yong-Chai,Lee, Sang-Duk,Jeon, Han-Yong 한국섬유공학회 2011 한국섬유공학회지 Vol.48 No.3

Geogrids and geotextiles' shear behaviors were evaluated after installation damage testing. Frictional coefficients of resistance to direct sliding ($f_{ds}$) were estimated by theoretical shear analysis. The shear strength of the damaged geogrid decreased under a high normal stress of 150 kPa; that of the geotextile decreased with increasing normal stress. fds values were found to be lowered by installation damage, through comparison of $f_{ds}$ values calculated by direct theoretical shear analysis before and after installation damage.

지황 및 숙지황 분말의 품질 및 항산화 특성

오혜림(Hye Lim Oh),김초롱(Cho Rong Kim),김나연(Na Yeon Kim),전혜련(Hye Lyun Jeon),도은수(Eun Soo Doh),김미리(Mee Ree Kim) 한국식품영양과학회 2013 한국식품영양과학회지 Vol.42 No.1

생리활성이 높은 지황을 식품소재로 간편하게 활용할 수 있도록 하기 위한 연구로, 생지황과 숙지황을 동결건조한 후 이화학적 특성과 항산화능 분석 및 관능검사를 실시하였다. 명도와 황색도는 숙지황 분말이 숙지황 분말보다 낮았고, 적색도는 숙지황 분말이 생지황 분말보다 높았다. 당도 및 환원당 함량은 숙지황 분말이 30.3oBrix 및 6.06%로 생지황분말에 비하여 높았다. pH는 숙지황 분말은 4.23으로 생지황 분말의 6.71보다 낮았으며 산도는 숙지황 분말은 0.35%로 생지황 분말의 0.20%보다 높았다. 일반성분 분석에서 수분함량은 숙지황 분말 4.2%, 지황분말 3.8%로 숙지황 분말에서 높았으나 그 외 일반성분은 유사하였다. 유효지표성분 분석에서 catalpol 함량은 생지황 분말에서 144.96 mg/mL로 검출되었고 숙지황 분말에서는 47.20 mg/mL로 검출되었다. 5-HMF는 숙지황 분말에서만 검출되었다. 총 phenol 함량측정 결과 생지황 분말이 2.09 mg/mL, 숙지황 분말이 3.66mg/mL로 생지황 분말보다 숙지황 분말에서 현저히 높은 함량을 나타내었고 DPPH radical 소거능 측정 결과 IC50 값이 생지황 분말 26.64 mg/mL, 숙지황 분말 13.74 mg/mL로 숙지황 분말의 항산화능이 매우 높았다. Hydroxyl radical 소거능 IC50 값은 숙지황 분말의 값이 6.37 mg/mL로 생지황 분말의 13.27 mg/mL보다 더 낮게 나타나 숙지황 분말의 항산화능이 더 높게 나타났다. FRAP 활성 측정 결과 생지황 분말이 0.51 mg/mL, 숙지황 분말이 1.99 mg/mL로 숙지황 분말이 높아 전반적으로 숙지황 분말의 항산화능이 더 높았다. 이상의 결과로부터 숙지황 분말이 식품소재로 더 적당한 것으로 사료된다. This study was carried out to investigate the quality characteristics and antioxidant activities of Rehmanniae radix (Rehmannia glutinosa Libosch. var. purpurea Makino) freeze-dried powder (RRP) and Rehmanniae radix preparata powder (RRPP). Under the Hunter color system, redness was higher and lightness/yellowness lower in RRPP, compared to RRP. The reducing sugar contents of RRP and RRPP were 0.8% and 6.0%, respectively (p<0.05). The pH was lower in the RRPP (RRP: 6.71, RRPP: 4.23). The amount of catalpol amount in RRPP (47.20 mg/mL) was lower than RRP (144.90 mg/mL). RRPP contained high amounts of 5-HMF (5-hydroxymethyl-2- furaldehyde, 47,231 mg/mL), but 5-HMF was not detected in RRP. Total phenol contents of RRP and RRPP were 2.10 mg/mL and 3.66 mg/mL, respectively. FRAP values of RRP and RRPP were 0.51 mg/mL and 1.99 mg/mL, respectively. The antioxidant activities by DPPH (1,1-diphenyl-2-picryl hydrazyl) and hydroxyl radical scavenging activity of RRPP were much higher than RRP. Based on these results, RRPP is a good candidate for food processing in terms for its physicochemical and antioxidative activities.