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宋承達,柳勝元 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-
An investigation was carried on the effect of mechanical stimulus on the stem elongation, leaf area growth and chlorophyll content of several annual and perennial plants. Mechanical stimulus was treated with different frequencies of 0, 10, 30, 60, 90, 120 and 150 times every day by touching and pressing on the stems and leaves. All the plants showed a gradual inhibition for the stem elongation, leaf area expansion and chlorophyll synthesis by the increased treatment. Herbaceous plants of Glycine max and Commelina communis, showed the most sensitivity for the treatments and died with treatment of 120 and 150 stimuli per day in the later growth period. but C. communis showed an enhancement of growth in the treatment of 10 stimuli per day. Forsythia koreana, a perennial woody plant showed more tolerance for the treatments than Vitis vinifera, a climbing plant. The main factor of the effect seemed to be ethylene synthesized during the treatment of mechanical stimulus.
Kim, Han-Soo,Cho, Yong Uk 慶北大學校 自然科學大學 1982 自然科學論文集 Vol.3 No.-
Gamma환의 개념은 1964년 [5] N.Nobusawa에 의해서 처음 정의 되었다. 그후 W. E. Barnes [2]에 의해 Gamma환은 약간 구조가 수정 되었으며, 그에 의해 많은 환에서의 성질 들이 환보다 일반화된 개념인 Gamma환에서 성립됨을 조사하였으며, 다시 S. Kyuno [4]에 의해 보다더 구체적으로 Gamma환에 관한 성질과, right operator환과 left operator환상에서 Ideal들의 관계와 Matrix환 사이의 관계에 대해 조사 되어왔다. 본 논문에서는 보다 일반화된 Gamma 환들사이의 동형작용을 조사했으며, strongly nipotent ideal, primitive Gamma환 prime Gamma환과 simple Gamma환들 사이의 관계를 참고문헌 [1]과 [3]을 이용하여 보다 구체적으로 조사하였다.
수용액에서 Cr(Ⅵ)화학종(H_2CrO_4, HCrO_4_^-, CrO_4^2-,H_xCr_2O_7^(2+x)-)사이에 형성되는 화학평형
박유철,변종철 慶北大學校 自然科學大學 1983 自然科學論文集 Vol.2 No.-
The study on the equilibrium between dimeric and monomeric species of chromic acid in aqueous solution has been carried out using spectrophotometirc method at temperature of 30℃ and ionic strength of 1.0. From the result measured, it could be found that the stability of dimeric species is increased with increasing the concentration of hydrogen ions. At pH=3, μ=1.0 and t=30℃, the equilibrium constant of dimerization reaction was 118 M^-1. In addition to that, the equilibria of hydrogen dissociative reaction of monomeric sepcies were determined at μ=0.1 and t=30℃. The dissociative constants of H_2CrO_4 and HCrO_4 - species were 0.11M^-1 and 3.6×10^-6M^-1, respectively, which are in agreement with the results of other investigations.
On Coo-Contractions with Dominating Spectrum
Lee, Sang-Hun,Kim, Y-C. 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-
한 perator에 의해 생성되는 predual 대수의 구성 연구로써 참고문헌 [1]에서 D.J. Westwood가 Hilbert space H 대한 operator의 성질연구로써 한 연산자 T가 유한 공간에서 작용할 때 T에 의해서 생성되는 algebra와 또한 점들의 evaluation들의 항등 convex결합들을 연구하고 또한 T의 축소 영역을 연구하였다. 본 논문에서는 연산자가 무한 공간에서의 작용으로 확장 연구하여 참고문헌 [1]의 결과들을 일반화하였으며 또한 점들의 evaluation들의 표현을 연구하였다. 그리고 특히 표현에서 지금까지 여러 가지로 알려진 결합을 eigenvector들의 결합계수와의 관계연구를 하였으며 그외 operator의 연산에대한 기본개념을 확고히 하였다.
環境物質의 濃度勾配가 Spirodela polyrhiza 個體群의 生長 및 生産性에 미치는 影響
宋承達,韓甲祚,金義守 慶北大學校 自然科學大學 1985 自然科學論文集 Vol.3 No.-
Effects of the concentration gradients of several environmental ions on S.polyrhiza population were investigated in respect of toxicity and tolerance, growth rate responses, chlorophyll contents. photosynthesis and respiratory activities. Heavy metal ions of Cd, Co, Cu, Cr and Hg showed strong toxicity at 1ppm level on the population growth, whereas the treatment with Pb showed tolerance at 10ppm level. B, Fe and Mn sitmulated the population growth at 0.01∼0.1ppm level, and Hiti restrained the population growth at 100ppm level. The relative growth rate of the population showed a cyclic change with 4 days interval. The maximum RGR was found with 0.01ppm level of B, Mn and Zn. The maximum chlorophyll content attained 102.2mg·g^-1 with 1 ppm Mn treatment and the minimum showed 59.4mg·g^-1 with 1ppm Cu treatment. The maximum photosynthetic rate was 0.40mg O_2·50 fronds^-1·hr^-1 with 1ppm Mn treatment , while no apparent photosynthesis was observed with 1ppm treatments of Cu, Cd and Hg. The maximum and minimum respiratory rates of 0.30 and 0.08mg O_2·50fronds^-1·hr^-1 were observed with 1ppm treatements of Hiti and Mn, respectively.
The Enumerative and Phytogeographical Studies of Balsaminaceae and Chloranthaceae in Korea
OH, Soo-Young 慶北大學校 自然科學大學 1985 自然科學論文集 Vol.3 No.-
韓國産 봉선화科와 홀아비꽃대科植物이 어떻게 構成되어 있는가를 알기 爲하여 現在까지 調査報告된 資料를 바탕으로 하여 學名, 異名, 國名, 産地 및 分布等에 對해서 調査하여 본 結果, 봉선화科植物은 1屬, 5種, 2變種 및 2品種 合計 9種類를, 홀아비꽃대科植物은 1屬, 5種임을 얻을 수가 있었다. 韓國産 봉선화科植物 9種類의 特徵을 要約하면 다음과 같다. (1) 韓國特産으로서는 「제주물봉선」, 「처진물봉선」 및 「가야산물봉선」의 1種, 2變種이며 (2) 全韓國分布型에 該當되는 것은 「물봉선」의 1種 (3) 濟州島分布型의 것에는 「제주물봉선」의 1種 (4) 鬱陵島分布型의 것에는 「미색물봉선」의 1品種 (5) 濟洲島를 除外하고 韓國全域에 넓게 分布하는 것은 「노랑물봉선」의 1種 (6) 北韓地域에서만의 分布를 나타내는 것은 「산물봉선」의 1種이다. 韓國産 홀아비꽃대科植物 5種의 特徵을 要約하면 다음과 같다. (1) 韓國特産으로서는 「고려꽃대」의 1種이며 (2) 濟州道分布型에 該當되는 것은 「진주란」의 1種 (3) ??陵島를 除外하고 韓國全域에 넓게 分布하는 것은 「홀아비꽃대」의 1種 (4) 南韓地域에서만의 分布를 나타내는 것은 「죽절초」, 「고려꽃대」「꽃대」 및 「진주란」의 4種이다. The work reported here was taken to clear the taxa of balsminaceae and Chloranthaceae in Korea, their scientific and Korean names, and the distribution of individual species in Korea and the world, based on the references reported by many authors and on the reports obtained by the author. The enumerated taxa of Balsaminaceae and Chloranthaceae in Korea are as follows: Family Balsaminaceae 1) Impatiens aphanatha Hook. Fil. 제주물봉선 2) Impatiens balsamina Linn. 봉선화 3) Impatiens furcillata Hemsley 산물봉선 4) Impatiens hypophylla Makino var. Korean Nakai 처진물봉선 5) Impatiens noli-tangere Linn. 노란물봉선 6) Impatiens noli-tangere f. pallida Hermann 미색물봉선 7) Impatiens textori Miquel 물본선 8) Impatiens textori var. atrosanguinea Nakai 가야물선 9) Impatiens textori f. pallescens (Honda) Hara 환물봉선
Distribution of Quasi-Ranges from a Logistic Distribution
Lee, In-Suk,Cha, Young-June 慶北大學校 自然科學大學 1982 自然科學論文集 Vol.1 No.-
分布의 모양이 正規分布와 유사한 logistic分布의 分位數에 대한 一般的인 準範圍의 確率密度函數를 구하였다.
On the Relations of The Continuous Functions
Lee, Sang Hun,Park, Sung Hwan 慶北大學校 自然科學大學 1985 自然科學論文集 Vol.3 No.-
S. Fomin[1]이 연속함수의 일반화인 θ-연속함수를 정의 발표한 이후 많은 학자들이 연속함수에 대한 일반화를 연구하였다. 본 논문에서는 지금까지 잘 알려진 모든 연속하수에 대한 연구와 관계들을 조사하였으며 알려지지 않은 분야에 대한 새로운 함수를 정의하여 잘 알려진 함수들과 관계를 조사함으로써 연속함수들의 관계를 정립시켰다.
RHEED에 依한 Si(111) 表面 및 Au, Ag, Ge 蒸着量에 따른 表面構造의 調査
朴東秀,鄭燦翊,鄭烝敏,崔鐘武 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-
The clean Si(111) and Si(111) surface structures induced by Au, Ag, Ge deposition were investigated by RHEED. cleaning of the sample was done by passing the dc current directly through the sample and the temperatures of the sample were measured by reading the currents. The background vacuum pressure of the RHEED chamber was about 2∼5×10^-10 torr during the experiments. The clean Si(111) 7×7 superlattice surface structure was obtained by heating the sample up to 1,250℃ repeatedly. The Si(111) 7×7 structure was remained from room temperature to 830℃. Above 830℃ the 7×7 structure turned to 1×1 structure. This structure transition was reversible. The 7×7 structure is energetically most stable in spite of its formation at rather high temperture. When Au, Ag and Ge atoms were deposited on the Si(111) 7×7 surface, the dependence of structures and phases on substrate temperatures and deposited coverages was drasical. Au/Si(111) surface has 7×7, 7×7+5×1, α-√3×√3, β-√3×√3 and 6×6 superstructures for the various thickness of Au film and substrate temperatures. Ag/Si(111) surface has √3×√3, √3×√3+3×1, √3×√3+3×1+6×1, 7×7+6×1+3×1 and 7×7+√3×√3 superstructures for the variot thickness of Ag film and substrate temperatures. When Ag was deposited on substrate at temperature ranged between 290℃ and 550℃, Ag rod patterns appeared on the √3×√3 structure induced by Ag deposition. It was considered due to the Stranski-Krastanov growth of Ag. Ge/Si(111) surface has 7×7, 7×7+5×5, 5×5 and 7×7(G3) superstructures for the various thickness of Ge film and substrate temperatures. It was found that the difference of the lattice constant for Si(111) 7×7 and Ge/Si(111) 7×7 and Ge/Si(111) 7×7 is about 3%.
ZnS:Mn AC 박막형 Electroluminescence device의 제작 및 특성조사
우재룡,김규채,채경락,이상윤 慶北大學校 自然科學大學 1987 自然科學論文集 Vol.5 No.-
ZnS: Mn thin film electroluminescence device have been fabricated by vacuum evaporation. Phosphor materials were prepared by heat treatment of pure ZnS powder and 0.45wt% quantities of Mn in Argon atmosphere for one hour. Insulator materials were prepared by the same method. These materials were evaporated on the ITO transparent electrode. These films showed electroluminescence phenomenon for AC input power. The brightness was measured as the dependence of applied voltage, the thickness, and the properties of insulator.