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김영관,장홍제,강경태 대한화학회 2017 Bulletin of the Korean Chemical Society Vol.38 No.9
We developed a seed-mediated growth strategy for the synthesis of Au nanoplate on the pyrene ethyleneglycol amine (PEA) functionalized reduced graphene oxide (PEA-RGO) films. This process yielded 17.6% of Au nanoplates on the PEA-RGO films, and the synthesized Au nanoplate/PEA-RGO nanohybrid films showed high potential as a surface-enhanced Raman scattering (SERS) platform.
김영관,이주 한국조명.전기설비학회 2008 조명·전기설비학회논문지 Vol.22 No.3
The purpose of this paper is characteristic analysis of multi-disk axial-gap pm motor for turbo compressor. The axial-gap permanent magnet motor has shown a growing interest in high-speed application for its high-efficiency, compact size and low vibration characteristics due to core-less structure. To achieve high-power, the axial-gap PM motor has multi-disk structure of stator and rotor disk. Because of its complicated magnetic flux path, it is not easy to calculate a dynamic characteristics using finite element analysis. In this paper, the simplified 2-D unfolded model to predict EMF characteristic is presented. To verify thesuggested 2-D unfolded model analysis of back-EMF characteristic was calculated and compared 3-D finite element. Finally the proposed method is verified by experimental results and shows good agreement with test results.
김영관,강탁 대한금속재료학회(대한금속학회) 1978 대한금속·재료학회지 Vol.16 No.5
Fe와 SO₄가 주성분으로써 이것이 ammoniojarosite와 carphosiderite의 형태로 존재하는 아연제련공장의 잔사물인 Y-site cake로부터 산화철을 얻어 공업적 이용이 가능케 하는 방법을 연구하였다. 이 잔사물을 단순히 열분해 시키면 NH₃와 CO₃가 각각 420℃ 및 710℃에서 분리 제거되며 Fe₂O₃가 남는다. 처리온도를 낮추기 위해 Y-site를 Na₂CO₃와 혼합하여 가열하면 400℃에서 Fe₂O₃와 Na₂SO₄가 얻어진다. 또 한가지 다른 방법으로는 Na₂CO₃용액에서 Y-site를 분해하여 Fe(OH)₃로 만들며 Na₂SO₄용액을 얻는 것이다. 이때 Y-site의 분해속도는 온도에 따라 심하게 영향 받으며 온도가 높을수록 필요로 하는 Na₂CO₃량이 감소한다. 이 아연제련공장의 잔사물을 처리하는 가장 좋은 방법은 열에너지 문제를 고려할 때 Na₂CO₃용액에서 분해시키는 방법이다. For the utilization of the zinc plant residues composed chiefly of ammoniojarosite and carphosiderite, the separation methods of iron oxide from the residues are studied. By thermal decompositions of the residues, gaseous ammonia and SO₃ were separated at the temperatures of 420° and 710℃ respectively and the remaining solids were iron oxide. When the mixtures of the residues and anhydrous Na₂CO₃ were heated, NH₃ was eliminated at much lower temperature (80°) and the remainders became iron oxide and water soluble Na₂SO₄ at 400℃. In the solutions of Na₂CO₃, the jarosite group compounds of the residues were converted to iron (III) hydroxide with SO²₄^- in solution, The conversion rate was increased and the amount of Na₂CO₃ required was decreased by increasing temperature of the solution. Among the methods studied, the conversion of the zinc plant residues to iron hydroxide in the solutions of Na₂CO₃ was considered the most economical for the recovery of iron oxide from the residues because of its low treatment temperature.
다자이 오사무(太宰治)소설의 모순구조 연구 : 『 가정의 행복 』 과 『 앵두 』 를 중심으로
김영관 한국일어일문학회 1996 日語日文學硏究 Vol.28 No.1
「家庭の幸福』,『櫻桃」, この二つの作品で共通もた特性は主人公らがおそろしいところ見做している現實を生きて行く主人公たちの考えと行動の不一致の要素が時間の流れるほど元來の意圖とは違う主人公の言行不一致のせいで作品をあきあきさせる要素として作用し, たびたび讀者を食傷させる原因でもある. それがこの二つの小說で構造的ど矛盾で表われる誇張表現の濫發であり, 主人公が求めている正義と眞理さがしの過程で現われる僞善と虛像であった. 矛盾構造を持ってるこの作品群の特徵である文章の誇張, または逆說的な表現のいちばん代表的なものが,『家庭の幸福」では, $lt;家庭の幸福は諸惡の本$gt;と言う表現であり,『櫻桃』では $lt;子供より親が大事$gt;であるという表現などである. そうしながらも作者太宰治, あるいは主人公らは自身の狀況が少しでも不利に展開されると, 卽ち, 作品がもっと興味を誘發させることができない場合, 誇張された表現と逆說的な矛盾構造で, 讀者に哀願する呼訴策として, 依然として世の中をおそろしぃところと見做し, 甘ったれながら作品を導びくのである. しかし, そのような矛盾点のぁる設定にもかかわらず, 解讀法は作品の興味の誘發の手段として作用される点でとらえるべきで, このような硏究が各作品の正しい讀みに何よりも重要な要素であることは違ぃなぃと言えるだろう.
산성강하물이 지표수의 산성화에 미치는 영향 Ⅰ : 현장 조사 A Field Study
김영관,이동석,김만구,우경식 한국지하수토양환경학회 1996 지하수토양환경 Vol.1 No.2
산성강하물이 단기간에 걸쳐 지표수의 산성화에 미치는 영향을 조사하기 위하여 1995년 6월부터 10월까지 외부오염원이 거의 없는 강원도 춘천시에 위치한 저수지를 선정하여 연구를 수행하였다. 연구지역 일대의 지질을 조사하고 산골짜기에서 저수지로 흐르는 작고 얕은 하천의 수질을 분석하였다. 강우량은 우량계를 이용하여 측정하였고 강하물은 자동포집기를 이용하여 포집하였다. 연구기간동안의 강우의 pH범위는 3.81∼5.77로 평균 4.8을 나타내었으며 전기전도도 (EC)는 5∼189μS/㎝로 평균 10.6μS/㎝를 나타냈다. 음이온 중에서는 SO^2-_4의 강하량이 3,119.7 ㎏/㎦로 가장 많앗고, 양이온 중에서는 NH^4+가 1,053.2 ㎏/㎦로 가장 많았다. 지표수의 pH는 중성 또는 약염기성으로 강우의 pH가 산성이었음에도 지표수의 산성화 현상은 관찰되지 않았다. 그러나 골짜기에서 흐르는 하천수를 측정할 때마다 측정지점의 고도가 낮아질 수록 pH 값은 증가하는 경향을 나타내어 물이 하류로 흘러가는 동안에 일어난 산성 또는 염기성물질로 인한 산염기반응의 영향을 보여주었다. 이 결과는 토양의 완충능력과 모암내에서의 중화능력을 각각 구별하여 조사할 필요성을 제시하였다. Effects of acid deposition on the acidification of surface water over a short term period were studied during june∼October, 1995. A reservoir located in Chunchon, Kangwondo was selected for this study because this reservoir had received little man-made pollutants. Gelolgical survey within the study area was carried out and the pH of a small and shallow stream flowing from the mountain valley down to the reservoir was monitored. Rainfall was measured by using a rain gauge and the precipitation was collected by automatic precipitation sampler. During the study period, rain pH was in the range of 3.81∼5.77 with an average of 4.8. The EC was in the range of 5∼189μS/㎝ with an average of 10.6μS/㎝. Ionic composition of the rainfall showed that, of the anions, deposition of SO^2-_4 was highest with 3,119.7 ㎏/㎦, and it was NH^4+ with 1,053.2 ㎏/㎦ for cations. The surface water pHs were maintained neutral or weak basic, representing little evidence of acidification regardless of the acidic rainfall pH. Every time of sampling, however, the pHs exhibited increasing tendency as elevation of measuring site of the stream became lowered, which indicated the impacts of acid-base reactions by acidic or basic substances during travel of water downstream. This result suggested the necessity of further research to determine the respective buffering capacity of soil and underlying rocks.