RISS 학술연구정보서비스

검색
다국어 입력

http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.

변환된 중국어를 복사하여 사용하시면 됩니다.

예시)
  • 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
  • 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
닫기
    인기검색어 순위 펼치기

    RISS 인기검색어

      검색결과 좁혀 보기

      • 좁혀본 항목

      • 좁혀본 항목 보기순서

        • 원문유무
        • 음성지원유무
        • 원문제공처
        • 등재정보
        • 학술지명
        • 주제분류
        • 발행연도
        • 작성언어
        • 저자

      오늘 본 자료

      • 오늘 본 자료가 없습니다.
      더보기
      • 무료
      • 기관 내 무료
      • 유료
      • Evaluation of late-sowing-adaptable soybean cultivar in paddy field

        Han,Won,Young,Park,Hyeon,Jin,Oh,Ki,Won,Kim,Hyun,Tae,Shin,Sang,Ouk,Lee,Byong,Won,Ko,Jong,Min,Baek,In,Youl 한국육종학회 2013 한국육종학회 심포지엄 Vol.2013 No.07

        Soybean self-sufficiency in Korea was 22.5% in year 2011, and as free trade agreement between Korea and US comes into effect, the amount of soybean importation increases. In 2012, paddy field soybean cultivation was over 0.1 million ha and it is expected to increase continuously due to rise in market price of soybean. Moreover, double cropping system including paddy field soybean is widely adopted nationwide, but studies on appropriate cultivar for this environment are insufficient. In this research, the effect of planting date and different cultivars on soybean growth and yield was investigated for three planting dates (June 20, July 5, and July 20) with 15 cultivars. According to ANOVA test, soybean yield was significantly different depending on sowing date and cultivars and interaction between sowing date and cultivars was also detected, meaning each of cultivars resulted different yield depending on sowing date. When planted on July 20, stem length, nod number, branch number and grain weight was decreased because of short growing period, resulting in yield decrease. Percentage of yield obtained from July 20 in contrast to that of June 20 showed that Pungwon, Nampung and Daepung recorded the least yield decrease and the highest yield when planted late. Evaluation of late-sowing-adaptable soybean cultivar in paddy field is now being carried on following last year.

      • SCOPUSSCIEKCI등재

        Comparison of Proliferative Activity in Each Histological Subtypes of Benign and Atypical Intracranial Meningiomas by PCNA and Ki-67 Immunolabeling

        최승진,장은덕,권성오,계대곤,박춘근,이상원,강준기,Choi,,Seung,Jin,Chang,,Eun,Deok,Kwon,,Seung,Oh,Kye,,Dae,Kon,Park,,Choon,Keun,Lee,,Sang,Won,Kang,,Joon,Ki The Korean Neurosurgical Society 2000 Journal of Korean neurosurgical society Vol.29 No.9

        목 적 : 양성 뇌수막종에 비하여 이형성 및 악성 뇌수막종이 나쁜 임상적인 예후 및 양상을 보이는 것은 잘 알려져 있으나, 양성 뇌수막종에 있어서 각각의 병리조직학적 아형에 따른 생물학적 양상의 차이에 대해서는 잘 알려지지 않거나 일부 논란이 되고있다. 본 연구에서는 이형성 뇌수막종 및 양성 뇌수막종의 각각의 병리조직학적 아형에 따른 증식능의 차이여부를 알아보고자 PCNA와 Ki-67표지지수를 분석하였다. 방 법 : 본원에서 뇌수막종으로 수술을 시행하여 얻은, 재발을 보여 재수술을 시행한 2례를 포함하여, 파라핀에 포매시킨 27개의 조직을 대상으로 병리학적인 증식능을 분석하기 위해, PCNA에 대한 단일항체 및 MIB-1 단일항체를 이용한 면역조직화학적 염색을 시행하였다. 조직학적 분류상 meningothelial type이 8례, transitional type이 9례, fibroblastic type이 5례였으며, 이형성 수막종이 5례였다. 결 과 : PCNA표지지수의 평균값은 양성 수막종에서 meningothelial type이 $4.82{\pm}5.10%$, transitional type이 $9.01{\pm}4.25%$, fibroblastic type이 $5.66{\pm}5.32%$를 보였으나 이형성 수막종에서는 $27.62{\pm}19.67%$의 높은 지수를 나타냈고, Ki-67 표지지수의 평균값은 양성 수막종의 아형에서 각각 $0.43{\pm}0.85%$, $0.44{\pm}1.08%$, $0.24{\pm}0.18%$를 보이고, 역시 이형성 수막종에서는 $0.84{\pm}0.59%$의 높은 지수를 보였다. 즉, 양성 수막종에서 각각의 아형에 따른 PCNA 및 Ki-67 표지지수는 통계학적으로 의미있는 차이는 없었으나(p>0.05), 이형성 수막종에서는 의미있는 높은 표지지수를 보여(p<0.05) 양성 수막종에서 보다 높은 증식능을 보임을 알 수 있었다. 결 론 : PCNA 및 Ki-67 표지지수를 이용한 증식능의 비교결과, 양성 뇌수막종에서는 각각의 아형에 따른 생물학적 양상이나 예후는 차이가 없을것으로 생각되나, 이형성 수막종에서는 높은 증식능을 보여 이에 대한 예후를 예상할 수 있을것으로 생각되며, 또한 이러한 표지지수가 병리조직학적으로 양성과 이형성의 감별에 많은 도움이 될것으로 사료된다. Objective : The clinical prognosis and biological behavior of atypical and especially malignant meningiomas are well known to be worse than benign meningioma, but the degree of biological aggressiveness in each classical subtypes of benign meningioma is controversy. This study was performed to see whether there is a difference in the proliferative activity between each different histological subtypes of benign meningioma as well as atypical meningioma. Methods : Paraffin-embedded surgical specimens of 27 meningiomas, including two recurrent tumors, were studied to evaluate proliferative activity by immunohistochemical method with monoclonal antibodies to proliferating cell nuclear antigen(PCNA) and MIB-1. The specimens consisted of 8 cases of meningothelial, 9 cases of transitional, 5 cases of fibroblastic subtypes and 5 cases of atypical meningiomas. Results : Mean PCNA labeling indices of meningothelial, transitional and fibroblastic meningiomas were $4.82{\pm}5.10%$, $9.01{\pm}4.25%$ and $5.66{\pm}5.32%$, but that of atypical meningiomas was $27.62{\pm}19.67%$, noting a higher value compared to all three subtypes of benign meningiomas. Mean Ki-67 labeling indices of the above 3 subtypes were $0.43{\pm}0.85%$, $0.44{\pm}1.08%$ and $0.24{\pm}0.18%$, and that of atypical meningiomas was also revealed to be of higher value ($0.84{\pm}0.59%$). PCNA and Ki-67 labeling indices were not statistically different between histological subtypes of benign meningioma(p>0.05), but the differences of both immunolabeling between benign and atypical meningiomas were statistically significant(p<0.05). Conclusion : Immunolabeling of PCNA and Ki-67 in intracranial meningiomas reveals no prognostic difference between meningothelial, transitional and fibroblastic subtypes in classical benign meningiomas by measuring expression of PCNA and Ki-67, but it seems to be helpful in differentiating benign and atypical meningioma, later showing more proliferative activity and biological aggressiveness.

      • KCI등재

        촉매를 이용한 이산화탄소 고정화 및 고리형 카보네이트 합성반응에 대한 계산화학적 해석

        안혜영(Hye Young An), 김민경(Min-Kyung Kim), 정희철(Hui Cheol Jeong), 엄기헌(Ki Heon Eom), 원용선(Yong Sun Won) 한국청정기술학회 2016 청정기술 Vol.22 No.1

        본 연구에서는 이론화학 또는 분자모델링이라 불리는 계산화학을 기존에 연구된 촉매반응 실험결과를 해석하는 데 접목시켜 보았다. 온실효과의 주범인 이산화탄소를 에폭사이드와 반응을 통해 고정화하고 카보네이트를 생성하는 반응을 선택하였는데 이 반응은 활성화 에너지(55~59 kcal/mol)가 높아 촉매의 사용이 불가피하다. 많은 기존 연구들 중에 ZIF-90/ionic liquid immobilized ZIF-90 (IL-ZIF-90), polystyrene-supported quaternized ammonium salt, KI/KI-glycine, dimethylethanolamine (DMEA)를 촉매로 사용한 경우에 대해 반응의 각 단계를 계산하여 반응의 경로를 예측하고 단계별로 구한 에너지를 바탕으로 에너지도를 구성함으로써 실험결과를 열역학적으로 해석하였다. ZIF-90/IL-ZIF-90과 KI/KI-glycine의 경우는 실험적으로 후자들이 상대적으로 높은 수율을 얻었는데 계산 결과 활성화에너지가 낮아진 이유가 아니라 전자들의 경우 반응 중간체가 높은 에너지를 가져 반응물로 되돌아가는 역반응에 의해 정반응의 진행이 방해를 받은 것으로 밝혀졌다. DMEA를 촉매로 사용하였을 경우는 활성화 에너지를 ~42 kcal/mol로 낮춰줌으로써 금속이나 할로겐염 없이도 촉매의 활성이 잘 일어남을 증명하였다. 폴리스티렌(polystyrene)으로 지지된 quaternized 암모늄염 촉매의 경우 클러스터 가정을 사용하여 계산을 진행하였으며 암모늄염의 -NH기와 에폭사이드의 O 원자 사이의 상호작용의 가능성을 확인할 수 있는 반응경로를 제시하였다. In this study, a computational chemistry methodology called as molecular modeling was been applied to explain several experiment results mechanistically. The reaction chosen for this study was to remove carbon dioxide, known as a primary greenhouse gas, by an epoxide via the carbon dioxide fixation to produce carbonates. This reaction inherently needs the use of catalysts because it has a significantly high activation barrier (55~59 kcal/mol). Among various types of catalysts, we studied in zeolitic imidazolate framework 90 (ZIF-90)/ionic liquid immobilized ZIF-90 (IL-ZIF-90), polystyrene-supported quaternized ammonium salt, KI/KI-glycine, and dimethylethanolamine (DMEA). First, probable reaction pathways were proposed based on calculated energetics by computational chemistry. The energetics was then used for the thermodynamic interpretation on the activity of catalysts. In the case of ZIF-90/IL-ZIF-90 and KI/KI-glycine, IL-ZIF-90 and KI-glycine showed better yields compared to their counterparts. The calculation proposed interesting results that it is not from the lowering of activation energy but from the unstable intermediates of ZIF-90 and KI-glycine. For DMEA, the calculated activation energy was ~42 kcal/mol, much lower than that of the non-catalytic reaction. A possible reaction pathway was located to confirm the interaction between -NH group from ammonium and oxygen from epoxide for polystyrene-supported quaternized ammonium salt.

      • Overexpression of alfalfa Hsp23 contribute to abiotic stress tolerance in tall fescue

        Ki-Won,Lee,Gi,Jun,Choi,Ki-Yong,Kim,Hee,Chung,Ji,Hyung,Soo,Park,Yong-Goo,Kim,Byung-Hyun,Lee,Sang-Hoon,Lee 한국육종학회 2012 한국육종학회 심포지엄 Vol.2012 No.07

        Tall fescue (Festuca arundinacea Schreb.) is an important cool season forage plant that is not well suited to extreme heat, salts, or heavy metals. To develop transgenic tall fescue plants with enhanced tolerance to abiotic stress, we introduced a MsHsp23 gene expression vector construct through Agrobacterium-mediated transformation. Integration and expression of the transgene were confirmed by PCR, northern blot, and western blot analyses. Under normal growth conditions, there was no significant difference in the growth of the transgenic plants and the non-transgenic controls. However, when exposed to various stresses such as salt or arsenic, transgenic plants showed a significantly lower accumulation of hydrogen peroxide and thiobarbituric acid reactive substances than control plants. We speculate that the high levels of MsHsp23 proteins in the transgenic plants protect leaves from oxidative damage through chaperon and antioxidant activities. These results suggest that MsHsp23 confers abiotic stress tolerance in transgenic tall fescue and may be useful in developing stress tolerance in other crops. Compared with traditional plant breeding, genetic engineering provides a relatively fast and precise means of achieving improved stress tolerance of forage crops. Development of forage crops that are more tolerant to various abiotic stresses could lead to the use of more new lands for cultivation.

      • SCIESCOPUSKCI등재

        Algorithm for Fault Detection and Classification Using Wavelet Singular Value Decomposition for Wide-Area Protection

        Jae-Won,Lee,Won-Ki,Kim,Yun-Sik,Oh,Hun-Chul,Seo,Won-Hyeok,Jang,Yoon,Sang,Kim,Chul-Won,Park,Chul-Hwan,Kim 대한전기학회 2015 Journal of Electrical Engineering & Technology Vol.10 No.3

        An algorithm for fault detection and classification method for wide-area protection in Korean transmission systems is proposed. The modeling of 345-kV and 765-kV Korean power system transmission networks using the Electro Magnetic Transient Program - Restructured Version (EMTPRV) is presented and the algorithm for fault detection and classification in transmission lines is developed. The proposed algorithm uses the Wavelet Transform (WT) and Singular Value Decomposition (SVD). The Singular value of Approximation coefficient (SA) and part Sum of Detail coefficient (SD) are introduced. The characteristics of the SA and SD at the fault conditions are analyzed and used in the algorithm for fault detection and classification. The validation of the proposed algorithm is verified by various simulation results.

      • SCIESCOPUSKCI등재

        β-Cyclodextrin Reduces Obesity in C57BL/6J Mice Induced by High Fat Diet

        Dae,Won,Kim,In,Koo,Hwang,Ki-Yeon,Yoo,Hua,Li,Tongkun,Pai,Young,Sup,Kim,Dae,Young,Kwon,Dong-Woo,Kim,Won-Kuk,Moon,Moo-Ho,Won 한국식품과학회 2008 Food Science and Biotechnology Vol.17 No.4

        Anti-obesity effects of β-cyclodextrin in obese C57BL/6J mice induced by a high fat diet (HD) were observed. The administration of β-cyclodextrin reduced the gain of body weight, abdominal fat, liver weight, the lipid deposits of hepatocytes and the size of adipocytes in the HD group. In serum analysis, the total and low-density lipoprotein-cholesterols were significantly decreased in the β-cyclodextrin-supplemented HD group than in the HD group. However, high-density lipoprotein-cholesterol was not changed in these groups. In hypothalamic homogenates, the decrease of neuropeptide Y and increase of α-melanocyte stimulating hormone were detected in the β-cyclodextrin-supplemented HD group compared to that in the HD group. These effects of β-cyclodextrin were similar to those of Garcinia cambogia, which is widely used as a natural anti-obesity product. These results suggest that β-cyclodextrin has anti-obesity effects through the lowering of the abdominal fat pad and inhibits the central effects of hunger.

      • KCI등재SCIESCOPUS

        Ordered Phases of Cesium in Carbon Nanotubes

        Jeong,Won,Kang,황호정,Jun-Ha,LEE,Ki,Oh,Song,Ki,Ryang,Byun,Oh-Keun,KWON,Won,Youg,Choi,Won-Woo,KIM 한국물리학회 2003 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.43 No.42

        We investigate the structural phases of Cs in carbon nanotubes by using a structural optimization process applied to an atomistic simulation method. As the radius of the carbon nanotubes is increased, the structures are found in various phases from an atomic strand to multishell packs composed of coaxial cylindrical shells. Both helical structures and layered structures are found. The numbers of helical atom rows composed of coaxial tubes and the orthogonal vectors of the circular rolling of a triangular network can explain the structural phases of Cs in carbon nanotubes.

      맨 위로 스크롤 이동