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      • KCI등재

        Electrodeposition of 70-30 CueNi nanocomposite coatings for enhanced mechanical and corrosion properties

        Casey R. Thurber,Yahia H. Ahmad,Stephen F. Sanders,Amaal Al-Shenawa,Nandika D'Souza,Adel M.A. Mohamed,Teresa D. Golden 한국물리학회 2016 Current Applied Physics Vol.16 No.3

        A copper-nickel alloy (70:30 ratio) was electrochemically deposited and compared to a composite coating incorporating layered silicate platelets to obtain copper-nickel-montmorillonite (MMT). The composite coatings were electrochemically deposited from a citrate bath to investigate the effects of MMT on the corrosion and mechanical properties of the coatings. Incorporation of MMT into the CueNi alloy films was not affected by the deposition parameters such as applied voltage and pH. Scanning electron microscopy and atomic absorption spectroscopy confirmed the successful incorporation of the MMT into the coatings. Longer term stability in the presence of corroding solutions was noted for the copper-nickel composite films. The Tafel calculations showed an increase in polarization resistance, Rp, from 190.7 kU$cm2 for pure CueNi to 314.3 kU$cm2 for CueNi-0.2% MMT after soaking the coatings in 3.5% NaCl at 25 C for two weeks, which was consistent with the resistance increase measured by electrochemical impedance spectroscopy. Microhardness test results showed about a 25% increase in the hardness for the copper-nickel coatings incorporated with the layered silicate platelets versus the pure CueNi coating.

      • KCI등재

        Early Summer Dissolved Oxygen Characteristics in Restored Streams in Seoul

        Casey Thoenen,Woonsup Choi(최운섭),Jinmu Choi(최진무) 대한지리학회 2013 대한지리학회지 Vol.48 No.3

        This paper presents an evaluation of stream restoration projects in Seoul with a focus on dissolved oxygen. Five test sites across four streams were measured for dissolved oxygen (DO) in late May to early June in 2012 and compared against a set of minimum and maximum thresholds. Only one test site, Hwarang-cheon, showed measurements below 6 ㎎/l DO. Towards the upper limit, the Hwarangcheon site was the only tested stream which was not at risk of DO supersaturation. The Danghyeon-cheon site had the highest probability of supersaturation, with DO saturation exceeding 130% expected 86.5% of the time. When measured every hour during daytime, DO levels showed diurnal variations, peaking in the afternoon. However, they showed inconsistent results along transects of the streams. Overall, the streams are rich in DO. To maintain the streams in good standing, nutrient loading should be addressed to prevent potential algal bloom induced hypoxic events down the line.

      • SCOPUSKCI등재

        Advances in the Development and Validation of Test Methods in the United States

        Casey, Warren M. Korean Society of ToxicologyKorea Environmental Mu 2016 Toxicological Research Vol.32 No.1

        The National Toxicology Program Interagency Center for the Evaluation of Alternative Toxicological Methods (NICEATM) provides validation support for US Federal agencies and the US Tox21 interagency consortium, an interagency collaboration that is using high throughput screening (HTS) and other advanced approaches to better understand and predict chemical hazards to humans and the environment. The use of HTS data from assays relevant to the estrogen receptor signaling data pathway is used as an example of how HTS data can be combined with computational modeling to meet the needs of US agencies. As brief summary of US efforts in the areas of biologics testing, acute toxicity, and skin sensitization will also be provided.

      • SCIESCOPUSKCI등재

        Airship Research and Development in the Areas of Design, Structures, Dynamics and Energy Systems

        Casey Stockbridge,Alessandro Ceruti,Pier Marzocca 한국항공우주학회 2012 International Journal of Aeronautical and Space Sc Vol.13 No.2

        Recent years have seen an outpour of revived interest in the use of airships for a number of applications.Present day developments in materials, propulsion, solar panels, and energy storage systems and the need for a more eco-oriented approach to flight are increasing the curiosity in airships, as the series of new projects deployed in recent years show; moreover, the exploitation of the always mounting simulation capabilities in CAD/CAE, CFD and FEA provided by modern computers allow an accurate design useful to optimize and reduce the development time of these vehicles.The purpose of this contribution is to examine the different aspects of airship development with a review of current modeling techniques for airship dynamics and aerodynamics along withconceptual design and optimization techniques, structural design and manufacturingtechnologies and, energy system technologies. A brief history of airships is presented followed by an analysis of conventional and unconventional airships including current projects and conceptual designs.

      • KCI등재
      • KCI등재

        Realizing housing justice through comprehensive housing policy reform

        Casey Dawkins 서울시립대학교 도시과학연구원 2021 도시과학국제저널 Vol.25 No.1

        A globally connected, locally centred housing justice movement calls for comprehensive reforms of policies that influence the distribution and affordability of housing. To date, this movement has yet to influence U.S. federal housing policy, which has historically prioritized tax expenditures supporting homeownership over affordable rental housing subsidies for low-income households. This paper takes these appeals to housing justice seriously and asks, ‘What would a conception of housing justice offer to housing policy makers seeking to enact comprehensive housing policy reforms designed to shift the balance of federal housing policy priorities away from homeownership towards the satisfaction of low-income households’ basic housing needs?’ I propose a conception of housing justice grounded in the ideal of civic equality, apply civic equality toward the evaluation of current U.S. federal housing policy, and propose a comprehensive national housing policy reform that is consistent with civic equality. The proposed ‘negative housing tax’ extends the idea of a negative income tax to a tax on housing consumption and capital gains from home sales. The revenues generated from the tax provide funds to support a guaranteed monthly housing allowance that would be distributed to those facing the most severe housing needs.

      • A Study on Native Language and Teachers in English Language Classrooms in South Korea

        Casey Gerard McKeever 부산외국어대학교 외국어연구소 2015 외국어연구 Vol.28 No.-

        <Abstract> A Study on Native Language and Teachers in English Language Classrooms in South Korea Casey Gerard McKeever The purpose of this study was to determine the attitudes of Korean university students towards their native language and English language teachers, both of which have been important factors in recent Korean government policy. To accomplish this, the students participated in a survey and their answers were then quantitatively and qualitatively analyzed. These participants were selected in particular because they were studying to become teachers in public elementary schools, and approximately half of them were studying to become English language teachers. Regardless of their course of study, many of the participants’ attitudes reflect the some of the ideals that studies have shown to be deeply rooted in English language teaching both in Korea and worldwide. Amongst a majority of the students there remains bias in favor of native English speaker teachers and against non-native speaker teachers. This is especially disconcerting since more than half of the respondents in this study are training to be English teachers themselves. Furthermore, many of the students show a disregard for the usefulness of their native tongue as a second language learning resource. Current research, however, details numerous advantages of using students’ first language in second language teaching. The responses of students who were studying to become English teachers indicated more favorability towards the native language as a resource. This suggests that along with effective government policy, education is necessary to counter the immense influence of colonial ideologies and globalization on English language teaching. Recent studies have linked Korea’s active response to globalization to the immersion-style practices that are detrimental to the Korean language, Korean teachers of English, and the socioeconomic status of Korean families. Key words: Native language, English Language Classrooms, Students' attitudes, English Language teachers, Socioeconomic status 한국의 영어교육을 위한 모국어와 언어교사에 관한 연구 1)믹키버 케이시 저라드* 연구의 목적은 한국 대학생들의 모국어에 대한 태도와, 영어교사 에 대한 태도를 밝히는 데 있다. 그리고 이 두 가지는 최근 한국 정부 정책에서 중요한 요인이 되어 왔다. 이 연구를 위해 학생들이 설문조 사에 참여했고, 그들의 응답은 양적, 질적으로 분석되었다. 이 참가자 들은 특히 국 ․ 공립 초등학교의 교사가 되기 위해 공부하고 있는 교 육대학의 학생들로 선택 되어졌고, 그 절반이상이 영어교사가 되기 위한 학생들이었다. 그들의 전공교육과목과 상관없이, 참가한 많은 학생들의 태도에서도 그 동안의 몇몇 연구된 내용들을 뒷받침하고 있고, 그 연구들은 한국을 비롯하여 전 세계적으로 깊이 뿌리박혀있 는 어떤 확실한 생각들을 보여준다. 대부분의 학생들은 한국인 교사 보다 원어민 교사를 선호하는 경향이 있었다. 이것은 특히 절반이상 의 응답자가 그들 스스로 영어교사가 되기 위해 공부하고 있는 학생 인 점을 감안하면 당혹스럽다. 게다가 많은 학생들은 그들의 외국어 습득 수단으로서의 모국어의 유용성을 간과했다. 그러나 최근의 연구 에서는 외국어에 대한 교육에 있어서, 모국어 사용의 많은 이점들을 상세하게 묘사하고 있다. 영어교사가 되기 위해 공부하고 있는 학생 들의 응답에서는, 자원으로서 모국어에 대한 더 많은 호감도를 나타 낸다. 이 학생들의 반응은, 효과적인 정부정책과 더불어, 영어 교육에 있어서 식민이념과 세계화의 거대한 영향에서 탈피할 필요가 있음을 암시한다. 최근의 연구들은, 한국의 세계화에 대한 적극적인 반응을 한국어, 한국인 영어교사, 한국 가족의 사회 경제적 지위에 대해 해 로운 몰입식 습관과 연관짓고 있다.

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