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김점식,Kim, Jeom Sik 대한화학회 1974 대한화학회지 Vol.18 No.4
植物油 脫臭溜出物에 함유되어 있는 sterine과 tocopherol의 效率的인 分離精製方法을 검토하였다. 시료를 가열하여 水層과 油層으로 分離하고 油層을 取하여 메틸에스테르화한 후 脂肪酸을 溜去하였다. 殘油分을 비누화하여 불비누화분만을 抽出, 濃縮한 후 메틸알코올에 녹여, 냉각함으로서 sterine을 분리하였다. 위의 母液을 메틸알코올에 녹인 후 $-20^{\circ}C$ 냉각하여 遊離脂肪酸을 제거하고 이온交換樹脂로 처리하여 高濃度의 tocopherol을 얻는 조건을 확립하였다. An investigation has been performed to find an effective separation method of steriols and tocopherols from the deodorized condensates of vegetable oils. Simple heating of the starting mixture isolated the oil layer from water, and the former was collected. It was then methyl esterified followed by a distillation for the removal of fatty acid. The ensuing step was to saponify the residue. The unsaponifiable matter was extracted by both methanol and concentrated. The sterol was crystallized by cooling such concentrated solution. To obtain tocopherol, the mother liquor was first dissolved in methanol. Cooling this solution to $-20^{\circ}C$ trapped fatty acid which was filtered out. The filtrate was then treated with ion exchange resin.
가공배전선로용 무정전 내장주 완철교체용 활선공구 및 표준활션공법 개발
김점식,송현석,문성원,박용범,조시형,최명호 대한전기학회 2006 Journal of applied mathematics & computing Vol.2006 No.5
In this paper, developed a uninterruptible hotline tools and method for replacement of strain pole crossarm on overhead distribution line. For practical use of developed tools, following direct hot-line methods were proposed: 'Direct hot-lire method for replacement of pin pole crossarm', 'Direct hot-line method for alteration of crossarm' and 'Crossarm replacement method in uninterruptible cable displacement area'. These methods were proposed more simple and safe working on hotline job.
22.9kV 배전선로 중성선 설치 구조에 따른 유도뢰 차폐효과 분석
김점식,김도영,박용범,Kim, Jeom-Sik,Kim, Do-Young,Park, Yong-Beom 대한전기학회 2010 전기학회논문지 P Vol.59 No.2
The electricity distribution system in Korea is adopting a multi-grounding system. Protection of this distribution system against lightning is performed by installing overhead ground wires over the high voltage wires, and connecting the overhead ground wires to the ground every 200 m. The ground resistance in this system is limited not to exceed $50\Omega$ and overhead ground wire and neutral wire are multiple parallel lines. Although overhead ground wire and neutral wire are installed in different locations on the same pole, this circuit configuration has duplicated functions of providing a return path for unbalanced currents and protecting the distribution system against induced lightning. Therefore, the purpose of this study is to analyze the induced lightning shielding effect according to the neutral wire installation structure of a 22.9kV distribution line in order to present a new 22.9kV distribution line structure model and characteristics. This study calculated induced lightning voltage by performing numerical analysis when an overhead ground wire is present in the multi-grounding type 22.9kV distribution line structure, and calculated the induced lightning shielding effect based on this calculated induced lightning voltage. In addition, this study proposed and analyzed an improved distribution line model allowing the use of both overhead wire and neutral wire to be installed in the current distribution lines. The result of MATLAB simulation using the conditions applied by Yokoyama showed almost no difference between the induced lightning voltage developed in the current line and that developed in the proposed line. This signifies that shielding the induced lightning voltage through overhead wire makes no difference between current and proposed distribution line structures. That is, this study found that the ground resistance of the overhead wire had an effect on the induced lightning voltage, and that the induced lightning shielding effect of overhead wire is small.