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가변피치프로펠러의 칼라형과 트러니언형 허브의 비교 연구
김기인(Ki-In Kim),송기주(Ki-Ju Song),전동춘(Dong-Chun Jeon),강선이(Sun-Yi Kang),김정렬(Jeong-Ryul Kim),차지협(Ji-Hyoub Cha) 한국마린엔지니어링학회 2009 한국마린엔지니어링학회 학술대회 논문집 Vol.2009 No.-
There are two kinds of hub mechanism on the controllable pitch propeller. One is the collar type and the other is the trunnion type. Pitch variation mechanism of the collar type of CPP is a simpler and cheaper solution, therefore CPP of this type is more applicable for commercial vessels. But the trunnion type of CPP has many advantages compared to the collar type of CPP : There are an ability to install up to 7 blades and a smaller dependency from bolt properties. The blades arrangement of trunnion type does not need bolts and it has a smaller disk factors for the same number of blades compared with the collar type CPP. In this instance, the CPP of trunnion type is an appropriate fit for the naval purposes(explosive shock) and ice breakers.
陽이온 交煥된 제올라이트 A 및 Mordenite 上의 CO 氣體 吸着
김종택,김흥원,김명철,이종렬,Kim Jong Taik,Kim Heung Won,Kim Myung Chul,Lee Jong Ryul 대한화학회 1992 대한화학회지 Vol.36 No.1
양이온 교환된 천연 제올라이트 $K_{111}$의 CO 기체 흡착특성과 양이온효과를 연구하였다. $Na^+-,\;Cu^{2+}-\;및\;Ba^{2+}-\;K_{111}$ 의 경우 우수한 CO 흡착능을 가졌으며, 0.4N $BaCl_2$ 수용액으로 처리된 것이 가장 큰 CO 흡착능을 나타내었고, 합성 제올라이트 4A, 5A보다 뛰어난 흡착능을 가짐을 알 수 있었다. 양이온의 종류에 따른 흡착경향은 $Ba^{2+}>Cu^{2+}>Na^+>K^+>Mg^{2+}>Ca^{2+}$ 의 순서로 나타났으며 단위격자당 교환된 양이온의 수와 종류 그리고 세공의 크기 등이 CO 기체의 흡착에 있어 주요 인자로 작용함을 알 수 있었다. 그리고 K111의 양이온에 따른 흡착경향을 비교하기 위해서 CNDO/2 계산을 행하였다. 계산된 결과 8원환 모델 내의 양이온과 CO 기체와의 상호작용 에너지는 실험결과와 비슷한 경향임을 알 수 있었다. The adsorption properties of CO on the cation exchanged natural zeolite, $K_{111}$ and cation effects upon the CO adsorption were studied. $Na^+-,\;Cu^{2+}-\;and\;Ba^{2+}-\;K_{111}$ exhibited relatively good CO adsorption capacities and $Ba^{2+}- K_{111}$ treated by 0.4 N-$BaCl_2$ solution proved itself as the best adsorbent and superior to the synthetic zeolite 4A and 5A. The observed adsorption tendency due to the cations were in the order of $Ba^{2+}>Cu^{2+}>Na^+>K^+>Mg^{2+}>Ca^{2+}$. The cation exchanged number per unit cell as well as the kind of cation which forms bond with CO molecules in different intensities and other mineral factors such as pore size indicated to be important factors to the CO adsorption properties. The CNDO/2 calculations were performed to compare the adsorption tendencies and CO interaction energy of cations in $K_{111}$.
김대상(Kim Dae-Sang),김성일(Kim Sung Il),유원희(Yu Won Hee),김성렬(Kim Sung Ryul),최지용(Choi Ji Yong) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
Is the high speed train with 300㎞/h running speed safe from derailment when it meets the mid or small-size earthquakes? In the present step, it is not so easy to judge whether it’ll be derailed or not during an earthquake. However, we could elevate the running safety of high speed train as making it slow or even stop. The main objective of this study is to make the domestic running regulation and the re-running manual for high speed train with reference to the standards of France, Japan etc. To do so, numerical analysis and experiment will be performed from the next year. In addition, we’ll evaluate possible places of derailment during an earthquake and make a database based on the Geographic Information System to effectively manage them.