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광양만 유역의 수질 및 표층퇴적물에서의 PFOS 및 PFCs의 오염에 관한 연구
조현서(Hyeon Seo Cho),강조해(Jo Hae Kang),이대인(Dae In Lee),조천래(Chon Rae Cho),최민호(Min ho Choi) 한국해양환경·에너지학회 2005 한국해양환경공학회 학술대회논문집 Vol.2005 No.11
Per Fluorinated Compounds(PFCs) are fully fluorinated organic molecules produced synthetically in an electrochemical fluorination process PFOS, PFOA, PFHS, PFOSA are including among PFCs these compounds have high molecular weight and created are environmentally stable these compounds used in a variety of applications, such as in lubricants, paints, cosmetics, and fire-fighting foams. Produced and used widely over the last half-century, PFCs are being detected in wildlife and humans around the globe. Kwangyang Bay is a semi-closed coastal sea on the south coast of Korea. The total population within the bay watershed is approximately 240,000 people. Several rivers and ditches, including the Seomjin River, one of Korea's five biggest river systems, enter the bay, and seawater is exchanged with the South Sea at the southern part of the bay. The water depth is less than 5m in the western part of the bay, and is more than 20m near Myodo and in the eastern part of the bay. The area is characterised by a semidiurnal tide. Land-based pollution sources(river water, sediment) were investigated in January 2005 and seawater and sediment samples were collected in November 2004 and January 2005. Ranges of concentrations of PFOS, PFOA, PFHS and PFOSA in stream waters were ND-1411.5ng/L, ND-376.0ng/L, ND-488.0ng/L and ND-3.6ng/L, respectively. Stream sediments were ND-5.43ng/g dry-wt, ND-0.47ng/g dry-wt, ND-0.14ng/g dry-wt and ND-0.47ng/g dry-wt, respectively. Ranges of concentrations of PFOA in sea water at November 2004 were ND-5.0ng/L.. PFOS and PFOA in sea water at January 2005 were ND-14.3ng/L and ND-4.9ng/L, respectively.
1차원 충돌 동역학 해석을 이용한 한국형 고속전철의 충돌사고 안전도 평가
구정서,조현직,Gu, Jeong-Seo,Jo, Hyeon-Jik 한국기계연구원 2002 硏究論文集 Vol.32 No.-
In this study, the crashworthiness of KHST has been evaluated by analysing a nonlinear spring/bar-damper-mass model of 1-dimensional collision dynamics. The numerical results show that KHST can easily absorb kinetic energy at lower impact force and acceleration in heavy collisions, when compared with KTX. Also, in a Light collision like a traint-to-train accident at lower speed under 8 kph, the carbody and components of KHST can be protected without any damage except the energy absorbing tube to be replaced easily. However, KTX may be much damaged in the light collision because there is no energy absorbing tube. In conclusion, the crashworthy performance of KHST has been much improved than that of KTX, although there are something to be improved for a better crashworthy performance
유아누리과정의 활동목표에 나타난 창의융합관련 요소 분석
전경원(Kyung Won, Jeon),조현서(Hyeon Seo, Jo),김누리(Noo Ree, Kim) 한국영재교육학회 2015 영재와 영재교육 Vol.14 No.1
본 연구는 3~5세의 누리과정 내에서 창의융합 교육활동이 전체 교육활동 중 어느 정도의 비율을 차지하는지 다각적으로 분석하여 유아교육 현장에서의 창의융합인재 양성을 위한 교육과정의 적용과 변화 가능성에 시사점을 제공하고자 한다. 이를 위해 3~5세 누리과정 교사용 지도서 32권을 면밀하게 분석결과 창의융합 교육활동은 전체 2116개의 활동중 총 231(10.92%)개였고, 생활주제별로 살펴보면 ‘봄‧여름‧가을‧겨울’이 39(17.89%)개로 가장 많았으며, ‘교통기관’이 10(5.56%)개로 가장 적게 나타났다. 이를 다시 연령별로 살펴본 결과, 연령이 증가할수록 창의융합 활동이 많은 것으로 확인되었다. 또한 활동유형별 창의융합 활동을 살펴보면 3세와 5세는 자유선택활동, 4세는 대소집단 활동의 수가 더 많은 것으로 나타났다. 누리과정 하위영역을 중심으로 창의융합 활동을 분석한 결과 예술경험과의 창의융합활동이 가장 많았으며, 반면에 신체‧운동 건강과 의사소통과의 창의융합 활동의 비율이 가장 낮았다. 이러한 결과를 중심으로 본 연구의 논의를 제시하였다. This research center has performed an analytic study of creative convergence related factors reflected in the activity goal of the teacher's manual for 3-5 year's “Nuri Curriculum” as announced for 2011. It was the intent of this study to use the results of this study to provide basic data related to how much creative convergence related factors can be applied and put into practice in the field of early childhood education. For this study, all activity objectives listed in book 32 of the Teacher's Manual for 3-5 year old “Nuri Curriculum” was selected for use as sampling. The analysis of the results involved creative convergence activities were full of activities, a total of 231 of 2116 (10.92%). And in the “Life Themes” ‘Spring Summer Autumn Winter' was the most activity with 39 (17.89%),’ ‘Transportation’ was the lowest in 10(5.56%) activities. And the more creative convergence activities were found to the elder years. In the activity types, free choice activities for 3 and 5 years the number of Large-small group activities were more. Creative convergence was the most activities associated with the arts. Exercise health and communication was the lowest. Finally, several suggestions to be considered for creative convergence activity in Nuri Curriculum were presented.