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White Ledger CNF를 이용한 종이 물성 개선
황임정(Im-Jeong Hwang),김진모(Jin-Mo Kim),이용규(Yong-Kyu Lee),원종명(Jong Myoung Won) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.4
The effects of white ledger CNF addition on the drainage characteristics and paper properties were investigated in order to evaluate the possibility of white ledger CNF as a papermaking additive for improving paper properties. The white ledger CNF addition showed a tendency to delay the dewatering on the paper machine wire and did not show any difference from the HwBKP CNF. As a result of FAP (Final Air Permeability) measurement to predict the dewatering characteristic at the press part, the FAP value tended to be slightly increased by the addition of CNF, but the difference was not so large enough that the dewatering at press part would not be significantly deteriorated. The bulk was slightly decreased as white ledger CNF was added, but there was no difference according to the kind of raw materials used for CNF production. The air resistance was increased with the increase of white ledger CNF addition. The opacity of handsheet did not show a significant change even though white ledger CNF was added up to 2%. Tensile index, tear index and Taber stiffness of handsheet were all improved by white ledger CNF addition. Especially, tensile index was improved significantly by the addition of white ledger CNF addition. It was also confirmed that alkaline pretreatment of white ledger before grinding is not necessary when it is used as a papermaking additive.
농촌 이주 도시민의 지역사회 참여활동 실태 및 생활 만족도와의 관계 분석
황정임 ( Jeong Im Hwang ),최윤지 ( Yoon Ji Choi ),조현민 ( Hyeon Min Cho ),윤순덕 ( Soon Duck Yoon ) 한국농촌지도학회 2011 농촌지도와 개발 Vol.18 No.4
The purpose of this study is to look into current situations of urban-to-rural migrants` community participation and its relationship with rural life satisfaction. This topic is important because one of the main barriers to migration decision is job availability, especially in rural areas. Besides, rural areas need more human resources to support aging communities, as rural population is constantly decreasing. For this study, we used the methods of survey and in-depth interview with structured questionnaire. We met 121 respondents who were in community participation activities by the snowball sampling method in 10 counties nationwide. As a result, we identified community participation activities could contribute to urban-to-rural migrants` stable settlement and improving their satisfaction with rural lives.
황정임(Jeong Im Hwang),김은자(Eun Ja Kim),이상영(Sang Young Rhee),이성우(Seong Woo Lee) 한국농촌지도학회 2009 농촌지도와 개발 Vol.16 No.3
The purpose of this study is to estimate the value of the sociocultural multifunctionality of rural areas in Korea. The sociocultural multifuntionality of rural areas consists of emotional comfort, green landscape, cultural heritage, and rural viability values. The value of the sociocultural multifunctionality was assessed by contingent valuation method incoporating preference uncertainty. The log-logit models indicated that households were willing to pay 14,027~26,757 won per month and the model with preference uncertainty gave the highest WTP. WTP was affected by respondent`s sex, location, awareness of relation with multifunctionality and others. The total value of sociocultural multifunctionality of rural areas in Korea estimated to 2,691~5,134 billion won per year.