2차방정식의 지도방안에 대한 실험적 연구

김두현 한국수학교육학회 1964 수학교육 Vol.2 No.4

中國經濟學의 變遷過程과 經濟原理

金斗鉉 단국대학교부설 중국연구소 1990 中國 Vol.- No.14

江戶 町會所의 設立과 그 性格 - 都市下層民 救濟를 中心으로 -

金斗鉉 서울대학교 동양사학과 2006 서울大 東洋史學科 論集 Vol.30 No.-

컨벡스(Convex) 구조를 이용한지문의 특징점 추출

김두현,박래홍 대한전자공학회 2003 電子工學會論文誌-SP (Signal processing) Vol.40 No.6

본 논문에서는 지문 영상의 컨벡스 (convex) 구조를 이용하여 특징점을 추출하는 방법을 제안하였다. 지문영상에서 융선은 일정한 방향성을 가지며 융선의 단면은 주기성이 있는 사인파로 간주할 수 있다. 사인파 신호에서 국부 최대 위치를 검출함으로써 대략적인 한 화소 단위의 융선 추출이 가능하며 사인파 신호의 볼록한 컨벡스는 융선 영역에 해당한다. 이러한 지문의 특징을 이용하여 특징점을 효과적으로 찾는 방법을 제안한다. 이 과정에서 파라미터를 없애고 계산량을 줄임으로써 다양한 환경의 시스템에 적용 가능함을 보였다. In this paper, we propose a new fingerprint feature extraction method using the convex structure. A fingerprint minutiae flows along the uniform direction and is regarded as a sinusoidal signal across the normal direction. Local maxima of the signal represent coarse thinned one-pixel-wide ridges in which the convex region of the signal correspond to ridges. The proposed fingerprint feature extraction method detects the convex structure and local maxima. Finally fingerprint features are extracted from one-pixel-wide ridges. Because it has no parameter, it is efficient for various fingerprint identification systems.

淸末 楊度의 民族問題 認識과 立憲君主論― ‘金鐵主義’ 分析을 中心으로 ―

김두현 서울대학교 동양사학과 2008 서울大 東洋史學科 論集 Vol.32 No.-

존덕정

김두현,Kim, Du-Hyeon 대한건축사협회 1984 建築士 Vol.1984 No.4

Phytotoxicity Symptoms and Germination of Dry Heat Treated Cucurbitaceous Crop Seeds and Effects of Fungicide Application

김두현,이정명 한국원예학회 2004 Horticulture, Environment, and Biotechnology Vol.45 No.3

Dry heat treatment (DHT) has been recently proven to be one of the most efficient seed sterilization methods for high-grade vegetable seeds. However, it was observed that dry heat treated seeds frequently show DHT-induced phytotoxicity and some decay problems during seed germination, i.e., yellowing of root cap followed by softening and browning of root progressively from the root tip to the upper roots. Severe restriction of secondary root growth was also observed especially when the germination tests were conducted under laboratory conditions. Early germination percentage, but not the final one, was frequently reduced by DHT in some cucurbitaceous crops. Severe contamination of air-borne fungi, most noticeably Mucor and Rhizopus, was found to be closely associated with this DHT induced germination problem. It is therefore recommended that seed lots of some cucurbitaceous crops, once treated with dry heat, should be thoroughly treated again with effective fungicides prior to sowing. Captan and Thioram were found to be effective in minimizing the DHT-induced decay during the germination.

박과채소 대목묘의 소질에 미치는 저온처리 및 상토의 효과

김두현,이정명 한국원예학회 2002 원예과학기술지 Vol.20 No.4

Effects of chilling of imbibed seeds and sowing media on seedling quality were examined in several cucurbitaceous crops grown for grafting. Among the substrates used for growing bottle gourd seedlings in trays of 72 cells, commercial pot substrate (Barokoe) showed the best seedling growth, indicating the importance of the sowing media used for growth promotion of very young seedlings even before the time of first true leaf unfolding. Presoaking the seeds in water increased the seedling emergence rate of watermelon, cucumber, and figleaf gourd. In bottle gourd seeds, however, the emergence rate was significantly reduced by the presoaking treatment. Low temperature storage of seeds after imbibition was effective for increasing percentage of healthy seedlings for grafting, possessing short and thick hypocotyl. 종자 처리와 용토 종류가 박의 발아 및 묘 소질에 미치는 영향에 관하여 실험하였다. 육묘에 이용된 용토 중 상토에서 가장 좋은 유묘 생육을 보여 본엽 전개 이전에 대부분 이용되는 대목묘의 유묘활력에도 용토의 중요성이 결정적 역할을 하는 것이 밝혀졌다. 파종전 침종처리는 수박, 오이, 흑종 호박에서는 발아율을 향상시켰으나, 박에서는 종자의 침지처리에 의해 발아율이 현저히 감소되었다. 박에서는 종자 흡수 후 5일 이상의 저온저장처리는 유묘 초기출현율의 현저한 증가를 보임과 동시에, 하배축장이 짧고 하배축경이 두꺼워지면서 본엽장 및 생체중이 높은 유묘가 육성되어 접목에 이용 가능한 건묘 특성이 강화되었다.

組織素 分解酵素를 生成하는 高溫性 곰팡이의 分離 및 特性

성낙계,강인수,박채규,정영철,김두현 慶尙大學校 1990 論文集 Vol.29 No.1

고온에서 잘 생육하고 cellulose 및 xylan 분해력 이 우수한 곰팡이를 분리할 목적으로 pH5.0, 50℃, Czapek-Dox pulp 배지에서 celluase complex와 xylanase생산이 우수한 곰팡이 H-702균주를 최종선정하여 균학적 성상을 조사한 결과, Aspergillus속과 거의 일치하였으며, 본 공시균주가 효소 생산에 미치는 영향과 효소학적 성질의 결과를 요약하면 다음과 같다. 생육 및 효소생성의 최적온도는 50℃이고, 균체증식 최적 pH는 5.0, cellulase 생산 최적 pH 는 4.5 xyanases는 4.0으로 나타났으며, 효소최대 생성 배양 4일째에, 균체증식은 약 3일경에 최대에 도달하였다.또한 α-1, 4-linkage를 가진 섬유성 물질 왕성하였으며 glucose 와 같은 저분자물질에서는 효소생합성이 현저히 저해되었는데 이런 결과로 볼때 이균주는 carbon catabolite repression을 받고 있었다. 효소생산에 적합한 탄소원으로는 α-cellulose,avicel, filter paper 등 이였으며, 질소원으로는 암모니아가 효과적이었으며 무기염류는 Ca??, Mg??, Mn??, Co??에서 효소생합성이 좋은것으로 나타났다. 계면활성제는 0.15% Tween 80이 좋았다. 개선된 KD배지에서는 각종 효소활성도가 1.2-1.6배 증가하였으며 또한 KD배지에서 각종탄소원을 지질로하여 효소 생합성을 조사한 결과 3% a-cellulose 에서 효소활성도가 좋았고 값싼 기질인폐신문지에서도 효소활성이 높게 나타났다. 조효소의 최적 온도는 cellulas complex 는 70℃, xylanase는 60℃로 나타났으며 열안정성은 cellulas complex 70℃까지는 30분간 , 80℃에서는 잔존활성이 약 93%였고 xylanase는 70℃에서도 거의 안정하였다.최적 pH는 cellulas complex는 5.0, xylanase는 5.5였으며, pH안정성은 3.0-8.0까지 안정하였다.조효소의 미치는 금속이온의 영향은 Ca??,Mg?? Mn??에의해 활성화 되었으며 Pb??, Cu??, Mg?? 에 의해 현저히 저해 현상을 나타냈다. In order to isolate a fungus which grow well in the high temperature and has the excellent decomposing power of cellulose and xylose a fungus. H-702 which produced potently cellulase complex(CMCase,avicelase and β-glucosidase) and xylanase in Czapek-Dox pulp medium (pH 5.0, 50℃) was finally selected. Then as a result of its bacteriological properties investigated it was almost the same properties as Apergillus sp.. The effect influencing to the enzyme production of the isolated strain and enzymological properties are followed. The optimal temperature and pH for cell growth and enzyme production were 50℃, 5.0, 4.5 and 4.0.respectively . The highest production of enzyme was shown when the culture time was three days and the greatest growth of cell was shown about after two days. In the cellulosic materials(CMC.avicel and α-cellulose etc.) containing α-1.4-linking the vigorous production if enzyme was shown and in the small molecular substance such as glucose was remarkably repressed. According to these results, this stain was under the control of carbon catabolite repression.α-cellulose , avicel and filter paper were suitable for carbon source in the enzyme production and NH? for nitrogen source and Ca??, Mg??, Mn?? and Co?? for inorganic salt. 0.15% Tween 80 was a good surface active agent. In improved KD medium each enzyme activity was increased 1.2 to 1.4 times. As a result of investigating enzyme biosynthesis, which each carbon source was used as substrate in the KD medium, it was shown a good enzyme activity. The optimal temperature of crude enzyme in cellulase complex and xylanase were 70 ℃and 60℃, respectively. Thermal stability was shown for 30 minutes until 70℃in cellulase complex and its residual activity at 80℃ was about 93%. It almost was stable at 70℃in xylanase. The optimal pH for cellulase complex and xylanase were 5.0 and 5.5.respectively and they were stable in the range of pH 3.0 TO 8.0. The crude enzyme was activated by Ca?? , Mg??and Mn?? but inhibited by Pb??, Cu?? and Ag?? remarkably.

警護學의 發達과 公警護의 專門化方案에 관한 考察

김두현 한국체육대학교 1998 敎養敎育硏究所 論文集 Vol.- No.3

I study on the Improvement of The Presidential Security Service and the development process of the politics of protection. The paper, purporting to analyze security and science, comprised for chapters. Chapter I which sets out purpose, scope and method, is followed by chapter Ⅱ, dealing largely with the development and coming into existence of The Politics of Protection. Chapter Ⅲ concerns the improvement of The Presidential Security Service and the important problems by which the security study. It is followed by concluding observation made in chapter Ⅳ.