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스핀 코팅법으로 제작한 다공성 CuBr 필름의 암모니아 감응특성
김상권 ( Sang-kwon Kim ),유병훈 ( Byeong-hun Yu ),윤지욱 ( Ji-wook Yoon ) 한국센서학회 2021 센서학회지 Vol.30 No.6
Porous copper bromide (CuBr) films are highly advantageous for detecting ammonia (NH<sub>3</sub>). The fabrication of porous CuBr films requires complex high-temperature processes or multistep processes. Herein, we report the uncomplicated preparation of porous CuBr films by a spin-coating method and the films’ excellent NH<sub>3</sub> sensing properties. The porous films were prepared by spin-coating 100, 150, and 200 mM CuBr solutions, and then dried in a vacuum oven for 2 h. All the films showed a high NH<sub>3</sub> response; in particular, the film prepared using a 100 mM CuBr solution showed an extremely high response (resistance ratio = 852) to 5 ppm NH<sub>3</sub>. The film also showed fast response and recovery times, 272 s and 10 s respectively, even at room temperature. The outstanding NH<sub>3</sub> sensing characteristics were explained in relation to the porosity and thickness of the prepared films. The high-performance NH<sub>3</sub> sensors used in this study can be used for both indoor air quality and environmental monitoring applications.
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김상권 ( Sang Kwon Kim ) 서강대학교 시장경제연구소(구 서강대학교 경제연구소) 2011 시장경제연구 Vol.40 No.3
본 논문은 연령별 소득 불평등의 결정요인을 분석하고 있다. 연구결과는 소득 불평등의 결정요인이 연령별로 차이가 있을 뿐만 아니라 결정요인의 중요도가 나이에 따라 변화 있음을 보여 주고 있다. 따라서 본 논문은 연령별 차이를 고려하지 않은 기존의 연구 결과들의 한계를 보여주고 있다. This paper investigates the importance of the determinants of income inequality across ages. The empirical results show that the importance of the determinants of income inequality not only differs much from the importance of the determinants on the overall Gini but also varies with age. This finding casts doubt on the robustness of previous empirical findings based on the overall Gini coefficient.
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김상권(Sang Kwon Kim) 한국가구학회 2018 한국가구학회지 Vol.29 No.4
With IKEA’s entry into Korea and changing lifestyles, the domestic furniture, distribution and fashion industries are scrambling to enter the home market. Additionally, the domestic home furnishing market size is expected to grow rapidly to about 18 trillion Korean won in 2023. Major furniture companies such as ‘Hanssem’ and ‘Hyundai Livart’ have opened a large specialty store to build a variety of home furnishing accessories to complement furniture sales. Distributors such as ‘Shinsegae’, ‘Lotte’, and ‘Hyundai Department Store’ are also focusing on the home furnishing market as a new business that can complement stagnant flagship businesses. Therefore, large stores are continuously expanding based on the existing nationwide distribution network. In particular, with the successful entry of IKEA into Korea, the home furnishing market is engaged in fierce competition between domestic and foreign companies to dominate the market. Also, the furniture industry, which is the center of the domestic home furnishing industry, is domestic demand, led by large and small businesses. Therefore, it is losing its competitive edge as it is located between low-cost imports with low labor costs and expensive imports focusing on design and function. Therefore, this study is designed to research and present development methods to strengthen the competitiveness of domestic companies in the home furnishing industry.
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김상권 ( Sang Kwon Kim ) 서강대학교 서강시장경제연구소 2017 시장경제연구 Vol.46 No.2
본 연구는 인공위성이 제공하는 야간 불빛 정보를 이용하여 1992~2012년 북한 소득에 대한 기존의 추정치를 평가하고, 동기간 동안의 북한 소득을 새로이 추정한다. 기존의 북한 소득 추정치는 부실한 데이터로 인해 추정치 간의 커다란 차이를 보였다. 이로 인해 북한 소득 추정치 대한 신뢰성과 유효성에 대한 의문이 제기됐다. 인공위성은 북한 전 지역을 북한당국의 간섭 없이 촬영하기 때문에 인공위성에 촬영된 야간 불빛은 북한 경제활동을 왜곡 없이 반영한다. 따라서 본 연구의 추정치는 북한 실상을 정확히 반영할 가능성이 높다. 분석결과 기존 추정치는 불빛 양과 관련이 없고, 새로운 GDP추정치는 기존의 추정치들보다 낮게 북한의 GDP를 평가하고 있다. PPP기준 1992년 북한 GDP는 남한 GDP의 3.5%에 해당하는 156억$ 이었고, 1인당 GDP는 남한의 7.3%에 해당하는 750$이었다. 2012년에 북한 GDP는 198억$, 1인당 GDP는 803$로 소폭 증가였다. 그러나 시간이 지나면서 남·북한 격차는 확대되었다. 2012년 북한의 GDP는 남한의 1.5%, 북한의 1인당 GDP는 남한의 2.49%였다. This study evaluates the existing previous estimates of North Korea`s GDP and newly estimates North Korea`s gross domestic product (GDP) for the period of 1992∼2012 based on the night-time satellite image. Due to the poor quality of the North Korean data, the reliability of the existing estimates has been in questions. In addition, the wide differences among the estimates undermine their validity. Since the satellite sees almost everywhere in detail, without the interference of the North Korean authorities, the estimates in the study may accurately reflect the economic reality of North Korea. The result reveals that all the existing previous estimates are not related to the sum of night lights and shows that the purchasing power parity-based estimates of GDP using night lights data are much lower than the estimates of the previous studies.
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김상권(Sang Kwon Kim) 한국가구학회 2017 한국가구학회지 Vol.28 No.4
Hans Wegner, one of the legendary designers who led the 20th century Nordic modern design, is a representative furniture designer of Danish Modern. His beautiful proportions, elaborate structure, lightweight and simple chairs show the essence of Danish modernism for mass production. Designed and built over 500 chairs, he demonstrated the essence of chair design through a fully structured prototype. He shows his passion and craftsmanship as a designer through over 1000 designs. In addition, chair design shows the value of timeless design and is loved by modern times. Therefore, this study aims to study the characteristics of chair design by Hans Wegner and to help furniture design education by analyzing design, structure, function and material.
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김상권 ( Sang Kwon Kim ) 한국산업조직학회 2009 産業組織硏究 Vol.17 No.2
본 논문은 Bedford 법칙에 근거 한국기업에서의 이윤조작 여부를 실증 분석한다. 분석결과 흑자기업에서의 이윤의 첫째 자리 숫자 분포가 Benford 분포와 통계적으로 유의한 차이가 나타났다. 그러나 적자기업에서는 통계적으로 유의한 차이가 발견되지 않았다. 이윤의 둘째 자리 숫자 분포의 경우는 흑자기업과 적자기업 모두에게서 Bedford 분포와 통계적으로 유의한 차이가 나타났다. 이러한 결과는 이윤조작이 한국기업에게서 광범위하게 일어났음을 보여준다. This study documents evidence of earning manipulation in Korea. The null hypothesis of no earning manipulation is examined by using Chi-squared statistics. It reports that the observed frequencies of earning do not match the Benford distribution. Specifically, the distribution of first digits in the subsample of firms reporting profit is significantly different from the Benford distribution at the one percent level. Also, in case of second digits the distribution of the subsample of firms reporting profits as well as the subsample of firms reporting losses deviate significantly from the Benford distribution at the one percent level. Overall, the results show that earning manipulation was a pervasive phenomenon among Korean firms.
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