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김병화,정선종,이도형,Kim. Byeong Hwa,Jeong. Seon Jong,Lee. Do Hyung 한국방재학회 2012 한국방재학회논문집 Vol.12 No.3
본 연구에서는 고유진동수를 이용하여 승강기 와이어 로프의 장력을 추정하는 방법에 대하여 소개한다. 제안 방법은 와이어로프의 진동수를 가속도계를 이용하여 계측하고 현이론법과 선형회귀법를 이용하여 장력을 추정하는 것이다. 제안 방법의 유효성을 검증하기 위하여 실물 승강기에 대하여 다양한 하중상태에 대하여 실험을 수행 하였다. 실험결과로부터 현이론법 및 선형회귀법 모두 오차범위 <TEX>${\pm}10%$</TEX> 이내로 정확한 값을 추정할 수 있었으며, 제안 방법은 승강기 와이어로프 장력추정 실무에서의 적용이 가능성할 것으로 판단된다. This study introduces the estimation technique of tension force on elevator wire rope using measured frequencies. The proposed approach estimates tension force of elevator wire rope by appling the measured frequencies into the taut string theory or linear regression technique. Such frequencies are measured by accelerometers attached on elevator wire rope. To validate the proposed approach, the various experimental cases for real elevator wire ropes are conducted. The results reveal that both the taut string theory and the linear regression technique show an error bound of <TEX>${\pm}10%$</TEX>. Thus, in practice, the proposed approach could be used for the estimation of tension force on elevator wire rope.
김도균(Do Kyun Kim),정선기(Seon Gee Jeong) 충남대학교 사회과학연구소 2014 사회과학연구 Vol.25 No.1
This study looks into the activity cases of social enterprises and township enterprises working in Daejeon Metropolitan City in order to examine how they are improving social capital of the community and what political implications the social capital established in that way presents. To attain the goal, the paper takes as its study subjects two cases of social enterprise 〈I’m Asia〉 and township enterprise 〈Gwanjeo Pumasi Community〉 working actively now. To sum up the study results, social enterprise 〈I’m Asia〉 not only vitalizes community networking but also encourages marriage-immigrant women’s participation in community activities and increases social capital of the community in a way that can transmit the attitude of multicultural tolerance. And township enterprise 〈Gwanjeo Pumasi Community〉 did vitalize the community’s social capital in a way of vitalizing the community’s cyber networking, creating the town’s common agenda, and strengthening the residents’ self-governing capacity. And social capital formed in this way can be used politically in the following ways: first, social capital connects different groups or individuals and helps the community’s resources and information to be utilized effectively. Second, social capital can also be used as resources that reinforce economic capital as well as human capital. Third, social capital can be utilized as the self-governing capacity of residents who are the partners in public-private cooperation.