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Reimagining multicultural education: Postcolonial approach
김재근,조영달 서울대학교 교육종합연구원 2014 The SNU Journal of Education Research Vol.23 No.-
This paper tries to re-imagine the multicultural education with the theoretical perspective of postcolonialism. For this end, we have reviewed what colonialism and postcolonialism means and the three most famous postcolonial theorists: Frantz Fanon, Homi Bhabha, and Gayatri Spivak. After that, contemporary multicultural education and its limits are examined, which finally leads to the re-imagination of education from postcolonial perspective. Based on the thorough theoretical inquiry on contemporary and postcolonial education, we have suggested the following paradigm shifts: First, shift from cultural diversity to cultural difference. Second, shift from nationalistic dualism to hybridized multicultural citizenship. Lastly we have re-imagined the future of education, which consists of the following four aspects: Curriculum, students, teachers, and evaluation.
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진관내동 생태계보전지역에서 산화환원전위(Redox Potential)의 월별 변화
김재근 한국습지학회 2004 한국습지학회지 Vol.6 No.2
습지에서 물의 효과는 토양 속으로 공기의 확산을 방해한다는 것이다. 이로 인해 습지의 토양 속에서는 산화 상태가 환원상태로 바뀌는 생화학적인 과정을 유도하게 된다. 건조토양이 수화된 토양이 될 때 산화환원전위는 낮아지게 된다. 그러므로 산화환원전위를 통해 토양의 소화된 정도를 알 수 있고, 이를 통해 어느 정도 습지의 화학적 특징이 나타날 지를 예견할 수 있다. 그러므로 본 연구에서는 진관내동 생태계 보전지역의 습지 토양 특성을 파악하기 위하여 2003년 5월부터 2004년 3월까지 산화환원 전위를 측정하였다. 깊이별 산화환원전위는 5월 10 cm 깊이에서 가장 높은 200 mV를 보였고 25 cm 깊이에서 가장 낮은 0 mV를 나타내었다. 이후 모든 깊이에서 낮아져 7월에는 약 -200 mV를 나타내었다. 이는 10월까지 지속되었으며, 이후 깊이가 낮을수록 산화환원전위의 증가폭이 크게 나타났다. 20 cm 깊이에서 측정한 5군데의 결과는 모두 비슷한 변화 양상을 보여주었다. 즉, 식물의 성장기 동안에는 낮은 값을 유지하다가 비성장기에는 증가하였다. 이러한 결과로부터 진관내동 생태계 보전지역의 토양은 환원된 상태의 습지 토양 특성을 잘 나타내고 있으며, 메탄화과정이 일어나고 있음을 알 수 있다. The most significant effect of excess water in wetlands is the isolation of the soil from the atmosphere and the prevention of O2 from diffusing into soil. The blockage of atmospheric O2 induces biological and chemical processes that change soil from oxidized into reduced state. When dry soil develop into hydric soil, redox potential is dropping. The redox potential is a indicator of hydric soil and affect chemical function of wetlands. To reveal characteristics of wetland soil, redox potential was measured in Jinkwannaedong ecological conservation area from May in 2003 to March in 2004. Redox potentials in May ranged from 5 mV at 25 cm depth to 200 mV at 10 cm depth. It decreased to about -200 mV at all depths and continued until October. In winter, redox potential was slowly increased; it was the highest at 5 cm depth and lowest at 20 cm depth. Annual variations of redox potential in 20 cm depth showed the same pattern at 5 sites; low in growing season and high in non-growing season. This results indicates that soils of study sites are in hydric state and methanogenesis is occurring in Jinkwannaedong ecological conservation area.
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전기화학중합에 의한 폴리피롤 적용 탄탈륨 캐패시터의 특성
김재근,여태환 한국화학공학회 2004 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.42 No.2
기존의 MnO_(2) 대신 폴리피롤(polypyrrole)을 전해질로 사용한 탄탈륨 고체전해질 캐패시터 특성을 고찰하였다. 폴리피롤 층의 생성은 절연특성이 있는 유전체 표면 위에 화학적 산화중합을 실시하여 폴리피롤 층을 사전에 형성한 뒤에 별도 외부 전극을 인가하는 방식으로 sodium p-toluenesulfonate를 도판트로 사용하여 정전류법에 의하여 실시하였다. 전기화학적 산화중합에 의하여 포리피롤 생성시 전해액의 피롤 단량체 농도가 증가할수록 전체 전해중합시스템의 등가직렬저항은 감소하였으며 시스템의 저항이 최소치에 도달하는 단계에서 초기 유전체의 반응 면적에 대한 포리피롤의 생성반응이 완성되는 것이 확인되었다. 0.05-1.5 ㏖/ℓ 범위의 피롤 농도를 사용하여 1-5시간 범위의 전기중합을 실시하여 그 상관관계를 조사한 결과 탄탈륨 소자 기공에 대한 높은 폴리피롤 충전도 및 내부, 외부간 균일한 폴리피롤 층을 형성하기 위해서는 임계농도와 임계반응시간이 존재하는 것이 확인되었다. 최종적으로 0.5㏖/ℓ 피롤 농도에서 4시간 전해중합을 실시한 경우에 가장 우수한 캐패시터 특성을 기록하였다. The characteristics of a tantalum capacitor using polypyrrole instead of MnO₂ as a solid electrolyte were studied. The polypyrrole layer was prepared by applying electrochemical oxidative polymerization galvanostatically in an aqueous solution dissolving sodium p-toluenesulfonate as a dopant. In this case an external electrode was applied to the surface of a tantalum pellet pre-coated with polypyrrole by chemical oxidative polymerization in order to give conductive property to the dielectric film because of its insulation property. It was identified that the equivalent series resistance of the reaction system decreased as the increase of the concentration of monomer pyrrole in an electrolyte and the initial polymerization on most reaction sites of the dielectric inside the pores was not completed until the ESR reached a minimum value. It was obtained from the analysis on the relation of a pyrrole monomer concentration ranged from 0.05 to 1.5㏖/ℓ and a polymerization time ranged from 1 to 5 hours that there were a critical concentration and a critical polymerization time to achieve a high degree of pore filling with polypyrrole and to form a uniform polypyrrole layer from inside parts to outside parts of the sintered pellet. The tantalum capacitor polymerized with a concentration of 0.5㏖/ℓ pyrrole for 4 hours was recorded the best properties finally.
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김재근,신차정,남종민 한국생태학회 2013 Journal of Ecology and Environment Vol.36 No.1
Cicuta virosa is an endangered species in Korea, which is a southern marginal area. To conserve and restore habitats of this plant, we investigated water and soil environmental characteristics and vegetation at four habitats during the growing season. The C. virosa habitats differed in community structure, water and substrate properties, and water regime. Although the total distribution ranges of the water and soil environments for C. virosa were wide and overlapped with the optimal environmental range of distribution of accompanying species, the optimal water level range for C. virosa was defined as 7 ± 3.5 cm. Water level was adjusted by substrate structure such as a mound of P. japonica and a floating mat comprised of accompanying species. A floating mat was an aid to maintain an optimal and stable water level in deep or fluctuating water and to prevent strong competition with prolific macrophytes. The GS sampling site, which had floating mats, could be a good model for C. virosa conservation in a warm temperate region, whereas the PC sampling sites, which experienced a water shortage in spring, provided a clue about the decline in C. virosa population size.
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