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- 저자 : 이충선 ( Chung Sun Lee ) (검색결과 5 건)
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졸-겔법에 의해 제조된 Al-Doped ZnO 박막의 후열처리 온도에 따른 전기 및 광학적 특성
고석배,최문순,고형덕,이충선,태원필,서수정,김용성,Ko, Seok-Bae,Choi, Moon-Sun,Ko, Hyungduk,Lee, Chung-Sun,Tai, Weon-Pil,Suh, Su-Jeong,Kim, Young-Sung 한국세라믹학회 2004 한국세라믹학회지 Vol.41 No.10
비등점이 낮은 용매인 isopropanol에 용질농도 0.7mol/$\iota$ Zn acetate를 용해시키고 dopant로 Al chloride를 첨가하여 균일하고 안정한 sol을 합성하였다. 졸-겔법에 의한 Al-doped ZnO(AZO) 박막의 제조시 $500\~700^{\circ}C$의 범위에서 후열처리 온도를 제어하여 박막의 전기 및 광학적 특성을 조사하였다. 후열처리 온도가 증가할수록 (002) 면으로의 c-축 결정배향성은 증가하였고, 박막 표면은 균일한 나노입자의 미세구조를 형성하였다. 광 투과도는 $650^{\circ}C$ 이하의 후열처리 온도에서 $86\%$이상이었으나, $700^{\circ}C$에서는 감소하였다. 박막의 전기 비저항 값은 $650^{\circ}C$ 이하에서 열처리 온도가 증가함에 따라 73에서 22$\Omega$-cm로 감소하였으나 $700^{\circ}C$에서 580$\Omega$-cm로 급격히 증가하였다. 후열처리 온도 $700^{\circ}C$에서 AZO 박막의 전기 및 광학적 특성의 열화는 XPS 분석결과, 박막 표면에 석출된 $Al_2O_3$ 상에 기인하였다. AZO 박막의 전기 및 광학적 특성 향상을 위한 최적의 후열처리 온도는 $600^{\circ}C$였다. Isopropanol of low boiling point was used as a solvent to prepare Al-doped ZnO(AZO) thin films. A homogeneous and stable sol was made from Zn acetate a solute whose mole concentration was 0.7mol/$\iota$ and Al chloride as a dopant. Al-doped ZnO thin films were prepared by sol-gel method as a function of post-heating temperature from 500 to $700^{\circ}C$ and the optical and electrical properties were investigated. The c-axis orientation along (002) plane was enhanced with the increasing of post-heating temperature and the surface morphology of the films showed a homogeneous and nano-sized microstructure. The optical transmittance of the films post-heated below $650^{\circ}C$ was over $86\%$, but decreased at $700^{\circ}C$. The electrical resistivity of the thin films decreased from 73 to 22 $\Omega$-cm as the post-heating temperature increased up to $650^{\circ}C$, but increased greatly to 580 $\Omega$-cm at $700^{\circ}C$. XPS analysis indicated that the deterioration of electrical and optical properties was attributed to the precipitation of $Al_2O_3$ phase on the surface of AZO thin film. This result suggests that the optimum post-heating temperature to improve electrical and optical properties is $600^{\circ}C$.
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전철현 ( Chul Hyun Jeon ),이충선 ( Chung Sun Lee ),신효중 ( Hio Jung Shin ) 한국환경정책평가연구원 2010 환경정책연구 Vol.9 No.2
본 논문의 목적은 강릉 남대천처럼 시민들과 매우 밀접한 관계에 있는 자연환경의 질이 악화될 경우 시민들의 후생에 얼마나 큰 영향을 미치는지를 조건부가치측정법을 통하여 평가하는 데 있다. 분석 결과, 강릉 남대천은 상수원의 제공뿐만 아니라, 공익적 기능, 생태적 기능, 물놀이, 휴양 및 심미적 만족감을 제공하는 장소로서 중요하다고 인식되고 있으며 강릉 남대천의 수질을 개선하기 위한 총 지불의사액은 가구당 연간 117,040원이 도출되었다. 먼저 수질개선 부담금의 지불에 가구당 연평균 약 87,502원으로 나타났고, 자원봉사에 대한 기회비용 측면에서는 연평균 29,538원으로 나타났다. 위의 결과를 근거로 강릉시 전체로 확대할 경우 수질 악화에 의한 간접적인 후생변화는 연간 약 270억원으로 산출되었다. 이처럼 수질 악화에 의한 후생변화는 매우 크다고 볼 수 있다. 따라서 자연환경은 비가역적인 특징을 가지면서 한번 파괴되면 복원되는 데 많은 시간과 비용이 수반되기 때문에, 자연환경의 변화는 궁극적으로 인간에게 영향을 미치게 된다. 그러므로 의사결정자들은 자연환경과 관련된 정책을 수립할 때 시장에서 평가되는 부분뿐만 아니라 시장에서 거래가 되지 않는 간접적인 부분까지도 충분히 고려하여야 정책의 효율성과 후생 증대의 목표를 동시에 달성할 수 있다. The purposes of the paper are to estimate welfare change from water quality degradation by using contingent valuation method in Namdae stream of Gangrung and identify what factors of Namdae stream are important to Gangrun citizens. The study results show their total WTP per year and per household, ￦117,040 to improve Namdae stream quality from grade 3 to grade 1, including monetary WTP ￦87,502 plus opportunity cost of volunteering time for protection campaign, ￦29,538. The amount of total welfare change from water quality degradation based on the total WTP estimated above is calculated to be ￦27 billion of which the amount, as a sort of damage cost from water quality degraded, is so huge. All projects and policies related to natural environments, therefore, should consider both indirect and direct effects from them because natural environments have the irreversibility once degraded or deteriorated and would ultimately be influential on humans, both current and future generations, with tremendous amounts of time and costs beyond our imagination.
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강원도 인삼농가의 행태분석을 통한 인삼고부가가치상품 개발가능성에 관한 연구
고종태 ( Jong Tae Goh ),신효중 ( Hio Jung Shin ),이희수 ( Ji Xiu Lee ),이충선 ( Chung Sun Lee ) 강원대학교 농업생명과학연구원(구 농업과학연구소) 2009 강원 농업생명환경연구 Vol.20 No.-
The purpose of this paper is to investigate the possibility of developing high value added products and their commercializing through the behavioral analysis of Ginseng farms which have the willingness to supply the raw Ginseng. The results show that with ages of 40s~60s, their income is lower than the debts and about 89 percent farms answered to think that the project above would succeed. With the above positive response, the portion of farms with the willingness to cultivate the Ginseng turns out to be more than 80 percent as well as more than 85 percent farms enlarged the cultivated land sizes than or maintained as that of previous year. And more than 90 percent farms appeared to have the contracts with the KT&G. It means that once the contract with farms have the stable and sustained price, its cultivating land size would be increasing.
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근육편 및 Polyurethane foam 전색술로 치료한 경동맥-해면정맥동루 1례 : 증례보고 Case Report
이충선,김진형,황성남,김병준 대한신경외과학회 1982 Journal of Korean neurosurgical society Vol.11 No.4
There have been various surgical methods to treat the carotid cavernous fistula such as the carotid ligation, trapping procedure, embolization with muscle, gelfoam and polyurethane foam, balloon technique and direct transcavernous approach. Each method has its own merits and disadvantages. The ideal treatment of the illness would be the selective closure of the fistula with preservation of carotid patency. The authors are reporting a case of C·C fistula in which selective muscle embolism preserving carotid flow was attempted at first, but the closure was incomplete that polyurethane foam embolization was done in addition with success.
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요추경막외강에서 발생한 원발성 임파육종 1예 : 증례보고 Case Report
이충선,이종광,김병준 대한신경외과학회 1983 Journal of Korean neurosurgical society Vol.12 No.3
Round cell sarcomas involving spinal epidural space such as Hodgkin's disease, plasma call sarcoma reticulum cell sarcoma and lymphosarcoma are well known disease. Of those, primary lymphosarcoma arising at spinal epidural space has been reported as the very rare disease by Bucy and other authors. The clinical pictures of the disease were presented by the compression of the spinal cord or cauda equina. If the condition treated promptly and properly with surgery and radiation therapy, the outlook would be good both for recovery and life in most instances. We have experienced a case of primary lymphosarcoma involving lumbar spinal epidural space in a 13 year old male and obtained a good result after surgery and radiation therapy.
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