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재활용 PET(polyethylene terephthalate)를 이용한 PBT(polybutylene terephthalate)올리고머 제조
조민정 ( Min Jeong Cho ),양정인 ( Jeong In Yang ),노승현 ( Seung Hyun Noh ),조홍제 ( Hong Jae Joe ),한명완 ( Myung Wan Han ) 한국화학공학회 2016 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.54 No.4
A new route for PBT (Poly butylene terephthalate) production from recycled PET (Poly ethylene terephthalate) has been explored. The route consists of glycolysis of PET (Poly ethylene terephthalate) wastes using 1,4-butandiol into BHBT oligomers and polycondensation of the oligomers into PBT oligomer. This process uses post-consumer or post-industrial recycled PET and converts it into high-end PBT type engineering thermoplastic via a chemical recycling process. Zink acetate was used as a catalyst for both glycolysis and polycondensation. Two types of reactor for the glycolysis, batch and semi-batch reactor, were investigated and their performances were compared. Semi-batch reactor removes ethylene glycol (EG) and THF (tetrahydrofuran) during the reaction. Amounts of EG and THF generated during the glycolysis reaction were measured and used as criteria for the reactor performance. Performance of semibatch reactor was shown to be better than that of batch reactor. Optimum reaction condition for the semi-batch reactor was BD/PET ratio of 4, and reaction temperature of 220℃, giving high EG yield (max 91%) and low production of THF. In addition, it was confirmed that the molecular weight of PBT oligomer increases in accordance with the progress of the polycondensation reaction.
일부 군인들의 입대 전후 간식섭취횟수 변화에 따른 구강건강관리실태와 구강건강증진행위에 대한 조사
조민정 ( Min Jeong Cho ),박영민 ( Young Mim Park ) 한국치위생과학회 2016 치위생과학회지 Vol.16 No.1
The purpose of this study was to find the attitude change for snack by military soldiers before and after entering military service. To investigate oral health status and improving activities, this survey was done for 318 soldiers at Gyeong-gi province Paju city and the results were as follows. After entering military service, the soldiers take more snacks than before and take snacks 2 or more times a day. Both smokers and non-smokers take more snacks after entering military service than before entering. The soldiers did not go dental clinic regularly. But they have lots of interests about oral health. As higher position and older, soldiers restrain themselves to taking sugar contained food, and the elder soldiers showed higher practical character for nutrition intake than younger soldiers. Private soldiers were least practical for brushing after meal and showed the highest level of fulfill for using fluoride contained toothpaste, regular scaling and checkup at dental clinic and flossing.
조민정 ( Min Jeong Cho ),심재민 ( Jae Min Shim ),이재용 ( Jae Yong Lee ),이강욱 ( Kang Wook Lee ),야오좡 ( Zhuang Yao ),류샤오밍 ( Xiaoming Liu ),김정환 ( Jeong Hwan Kim ) 한국미생물생명공학회(구 한국산업미생물학회) 2016 한국미생물·생명공학회지 Vol.44 No.2
대두에 B. amyloliquefaciens 2 균주들과 P. farinose SY80, 그리고 R. oryzae 총 4 균주를 접종한 메주를 만들었다(메주 1). 대조구로 B. subtilis KACC16450과 A. oryzae를 접종한 메주(메주 2)와 볏짚을 균원시료로 접종한 메주(메주 3)들을 제조하여 총 56일 발효시켰다. 발효 기간중 메주 1과 2의 pH와 적정산도는 메주 3보다 각각 높고 그리고 낮았다. 메주의 혈전용해능은 메주 1이 가장 높았다. 발효 기간중 모든 메주에서 B. cereus는 검출되지 않았으나 메주 2와 3에서 여러 모양과 색을 띈 잡균들이 검출되었다. 메주 2에서 histamine이 그리고 메주 3에서 tyramine이 저 농도로 검출되었으나 메주 1에서는 둘 다 검출되지 않았다. B. amyloliquefaciens EMD17이나 MJ1-4와 같은 항균력 균주들을 접종하여 메주를 제조하면 미생물학적으로 보다 안전한 장류제품들 생산이 가능할 것이다. A test meju (meju 1) was prepared by inoculating two strains of Bacillus amyloliquefaciens (EMD17, MJ1-4), Pichia farinosa SY80, and Rhizopus oryzae into cooked soybeans. A control (meju 2) was prepared by inoculating Bacillus subtilis KACC16450 and Aspergillus oryzae. Another control (meju 3) was prepared using rice straw as the source of microorganisms. Three different mejus were fermented for 56 days outdoors. Meju 1 and meju 2 showed higher pH values than meju 3, whereas meju 3 showed higher titratable acidity than meju 1 and meju 2. Meju 1 showed the highest fibrinolytic activity. Bacillus cereus was not detected in any mejus, but various microorganisms were detected in meju 2 and 3. Histamine was detected in meju 2 and tyramine in meju 3 at lower concentration, which were not detected in meju 1. It was concluded that microbially safe, fermented soybean products could be produced from meju fermented with starters such as B. amyloliquefaciens EMD17 and B. amyloliquefaciens MJ1-4.
간호대학생의 죽음불안과 품위 있는 죽음에 대한 태도가 연명치료중단 태도에 미치는 영향
조민정(Jo, Min Jeong),김성연(Kim, Seong Yeon),김에스더(Kim, Esther),염지수(Yeom, Ji Su),이가람(Lee, Ga Ram),정소영(Jeong, So Young),조현경(Cho, Hyun Kyung),최진권(Choi, Jin Kwon),한예지(Han, Ye Ji),이종은(Lee, Jongeun) 전남대학교 간호과학연구소 2020 Nursing and Health Issues(NHI) Vol.25 No.1
Purpose: This study aimed to examine the level of death anxiety, attitudes toward dignified death and withdrawal of lifesustaining treatment (WLST), and to analyze factors that influence these perspectives on WLST among nursing students. Methods: 141 nursing students were selected from five universities in C city as study participants. Data were collected from May to July 2019 and analyzed using unpaired t-test, one-way ANOVA, Pearson s correlation coefficient and stepwise multiple regression analysis with IBM SPSS Statistics 23.0 (IBM Corp., Armonk, NY). Results: Nursing students who experienced WLST among family, friends and acquaintances had significantly positive attitude toward WLST than students who did not (t=2.62, p =.010). Attitude toward dignified death was positively correlated with attitude toward WLST (r=.26, p =.002) and death anxiety (r=.18, p =.038). Factors that influenced perspectives on WLST were attitude toward dignified death (=.26, p =.001) and experience of WLST (=.25, p =.002). The combined explanatory power of the two factors was 12% (F=7.08, p <.001). Conclusion: The right attitude towards withdrawal of life-sustaining treatment are essential ethical values for nursing students. These results suggest the inclusion of thanatology and enhanced ethical education on life and death in the nursing curriculum.
대사증후군과 자기기입식 설문도구를 이용한 치주건강의 관련성
조민정 ( Min-jeong Cho ),심지선 ( Jee-seon Shim ),김현창 ( Hyeon-chang Kim ),송근배 ( Keun-bae Song ),최연희 ( Youn-hee Choi ) 대한구강보건학회 2016 大韓口腔保健學會誌 Vol.40 No.4
Objectives: Many recent studies have suggested that several systemic conditions, such as obesity, hypertension, hyperlipidemia, and diabetes, are related to periodontitis. The aim of this study was to investigate whether any particular metabolic syndrome component correlates with the periodontal status. Methods: This study analyzed data from 501 adults (age range, 30 to 64 years) who completed a general physical examination and an oral-health-related questionnaire between January 2014 and June 2014. Periodontitis was already used by the validity and reliability has been proven questionnaire. Multiple logistic regression analysis was used to assess the association between metabolic syndrome and the presence of chronic periodontitis. Results: Among the 501 participants, 81 (16.2%) had metabolic syndrome and 91 (18.2%) had chronic periodontitis. The prevalence of chronic periodontitis was 28.40% (23/81) and 16.19% (68/420) in the participants with and without metabolic syndrome, respectively. The association remained significant after adjusting for sex, age, education, income, occupation, and smoking status; the adjusted odds ratio was 2.03 (95% confidence interval, 1.11 to 3.71). Conclusions: A significant association exists between metabolic syndrome components and the periodontal status.
고지방식이 섭취 후 간헐적 저항성 신체활동을 통한 좌식 차단이 혈관 기능 및 식후 대사기능에 미치는 영향
조민정 ( Min Jeong Cho ),정용준 ( Yong Joon Jung ),김연욱 ( Yun Wook Kim ),최태구 ( Tae Gu Choi ),김재엽 ( Jae Yeop Kim ),김현정 ( Hyun Jeong Kim ),제세영 ( Sae Young Jae ) 대한스포츠의학회 2023 대한스포츠의학회지 Vol.41 No.2
Purpose: Numerous studies have reported the effects of interrupting prolonged sitting with aerobic exercise on vascular and postprandial function, but the effects of resistance exercise for interrupting prolonged sitting remain unclear. We tested the hypothesis that intermittent resistance activity breaks would attenuate prolonged sitting-induced vascular and postprandial metabolic dysfunction. Methods: Fourteen healthy adults (age, 24±2 years; body mass index, 22.0±2.4 kg/㎡) completed two trials in a randomized cross-over design. During a 4-hour sitting after a high-fat meal, the participants underwent either resistance activity (RA) with 10 repetitions of five exercises every hour or uninterrupted sitting as a control trial (SIT). Plasma glucose, triglycerides, and brachial artery blood pressure, along with blood flow and shear rate in the superficial femoral artery and carotid artery were measured at baseline and every hour during the 4-hour sitting period. Brachial artery flow-mediated dilation (FMD) was measured at baseline, 2 hours, and 4 hours after the start of the sitting. Results: Plasma glucose and triglycerides increased after a high-fat meal in both RA and SIT groups without a significant interaction effect. In addition, while SIT group decreased brachial artery FMD (7.2%±2.0% to 6.5%±2.7% to 5.1%±2.6%), RA did not attenuate a decrease in FMD (7.6%±3.4% to 7.3%±3.1% to 6.7%±2.7%, interaction p=0.581). Conclusion: Our findings indicate that interrupting prolonged sitting with intermittent RA did not attenuate the negative effects of sitting on vascular function and postprandial metabolism in young healthy adults.
유아의 정서지능, 어머니의 또래관리전략, 가정환경이 유아의 또래유능성에 미치는 영향
조민정(Min-Jeong Cho),문혁준(Hyuk-Jun Moon) 가톨릭대학교 생활과학연구소 2015 생활과학연구논집 Vol.34 No.1
In this research we investigated the effect of social demographic factor (especially childs gender and mothers job occupation), emotional intelligence of child, mothers peer relationship management strategy and home environment on the childs peer competence. Participants in this study were in total 319 five-years-old children, recruited from five child care facilities located in Seoul and Kyung-gi-do. SPSS WIN 17.0 program was used for the analysis of T-test, pearsons correlation and regression for the collected data, and the analysis results are as follows. Firstly, the gender of child and job occupation of mother had significant correlation with the child peer competence. Secondly, it was shown that childs peer competence has relation with childs emotional intelligence, mothers peer management strategy and home environment. Children with better self and others emotion usage, self emotions recognition and expression, emotion control and impulse suppression, peer relation skill and relation with teacher showed better peer competence. Thirdly, relative impact analysis showed that childs emotional quotation had most significant impact on childs peer competence, while mothers peer management strategy and home environment showed the second and third impact respectively.
자외선 경화형 아크릴계 점착제의 단량체 및 올리고머 함량이 실크 스크린의 인쇄성 및 점착력에 미치는 영향
조민정(Min-Jeong Cho),강호종(Ho-Jong Kang),김동복(Dong-Bok Kim) 한국고분자학회 2017 폴리머 Vol.41 No.2
자외선 경화형 아크릴계 단량체의 함량을 조절하여 디스플레이 모듈 접합에 사용할 수 있는 점착제를 중합하고 점착 물성 및 실크스크린 인쇄성을 평가하였다. 2-ethylhexyl acrylate(2-EHA)와 아크릴 산(AA) 93:7 비율을 기본처방으로 하여 점착력을 갖도록 하였으며, 기본 처방에 스크린 탈착성 향상을 위한 butyl acrylate(BA), 점착력 향상을 위해 2-hydroxyethyl acrylate(2-HEA)와 tetrahydrofurfuryl acrylate(THFA)를 각각 추가하였다. 기본처방에서 BA의 함량이 7 phr 이상일 때 타래길이는 급격히 감소하고 점착력은 증가하였다. 2-HEA가 3 phr 이상에서 접촉각은 작아지고 폴리카보네이트(PC)에서의 점착력이 감소하는 경향을 보였다. 실크스크린 인쇄 시 직진성과 인쇄퍼짐을 개선하기 위해 THFA를 시럽에 첨가함에 따라 2-HEA가 14 phr의 경우, 점착제의 인쇄성이 저하되는 것으로 나타났다. 결과적으로 기본 처방에 BA 7 phr, 2-HEA 3 phr 및 THFA 7 phr를 첨가했을 때 인쇄성이 가장 양호하였다. For application to display module junction, silk screen printing based on UV-curable acrylic adhesive was studied. Monomers were based on 2-ethylhexyl acrylate (2-EHA) and acrylic acid (AA) 93:7, butyl acrylate (BA), 2-hydroxyethyl acrylate (2-HEA) and tetrahydrofurfuryl acrylate (THFA) added for screen detachability and adhesion, respectively. When the ratio of BA in monomers was added above 7 phr, adhesive was less smeared the screen and spreading length of adhesive decreased, and its adhesion increased. As 2-HEA was added above 3 phr, contact angle decreased and peel strength also decreased on polycarbonate (PC) substrate. When 2-HEA ratio was 14 phr with THFA was added for screen printability include linearity and printing width, the printability of adhesive showed to decrease. As a result, BA 7 phr, 2-HEA 3 phr, and THFA 7 phr with based monomers had good printability.
기능 치아의 수가 잠재적으로 인지 기능에 영향을 줄 수 있을까?
조민정 ( Min-jeong Cho ),김지영 ( Ji-young Kim ),정윤숙 ( Yun-sook Jung ),신해은 ( Hae-eun Shin ),윤하영 ( Ha-young Youn ),박태준 ( Tae Jun Park ),최연희 ( Youn-hee Choi ),송근배 ( Keun-bae Song ) 대한예방치과·구강보건학회 2018 大韓口腔保健學會誌 Vol.42 No.2
Objectives: With the growing elderly population, there is an increasing interest in the oral and general health of elderly individuals. Loss of teeth is representative of oral disease in elderly individuals and is associated with medical and dental problems. The purpose of this study was to investigate the relationship between the number of remaining functional teeth and cognitive function. Methods: A total of 456 (111 public health centers, 261 senior centers, 84 sanatoriums) older adults (aged ≥65 years) residing in Korea were included. A mental health nurse examined the cognitive function using the Korean version of the Mini-Mental State Examination. A dentist examined the number of functional teeth and denture status through an oral examination, while a dental hygienist surveyed the subjective masticatory level using a questionnaire. Results: The mean age of the participants was 79.5 years (range 65-97 years), and 76.1% of them were women. Participants with a small number of functional teeth had lower cognitive function. In these participants, the odds ratio with poor cognitive function was 2.30 times higher; it was 2.74 times higher after adjusting for age, sex, residence, education, and denture use, and was statistically significant. Conclusions: Our study suggested that the number of functional teeth was associated with cognitive function in the Korean elderly population.