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김해준(Hae-Joon Kim),박경태(Kyung-Tae Park),박광서(Kwang-Seo Park),이현동(Hyun-Dong Lee),김충년(Chung-Nyun Kim),이광식(Kwang-Sik Lee) 한국조명·전기설비학회 2001 한국조명·전기설비학회 학술대회논문집 Vol.2001 No.-
The most of faults in gas insulation of power facilities are caused by partial discharge. Therefore we simulated partial discharge and measured the radiated electromagnetic wave emitted from partial discharge in SF? gas by biconical antenna. This paper describes time delay and electric fields pulse characteristics of radiated electromagnetic waves with distance(1[m], 3[m], 5[m]) between antenna and discharge source.
김해준(Hae Joon Kim),심기덕(Ki Deok Sim),김재호(Jae Ho Kim),조전욱(Jeon Wook Cho) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
Reduction of AC losses is very important for realizing HTS cable and it had been reported that the same layer current controlled by twisting pitch and direction could reduce the AC losses effectively. During the long-term development of HTS cables, the superconductor AC losses will need to be reduced to a level determined by the economics of each installation and the efficiency of the refrigeration. Theoretical models have been developed to predict the magnitude of the losses in cables composed of several layers of flat HTS tapes. This paper is manufactured mini-model HTS cable and voltage signal line to spiral shape. Mini-model HTS cable is composed of 13 HTS tape. We measured to critical current and AC loss and compared used lock-in-amp to cancel coil. This data is useful to HTS cable of DAPAS program.
Cryptand 이온교환 수지에 의한 U(Ⅵ), Pb(Ⅱ), Ce(Ⅲ) 금속 이온들의 흡착
김준태(Joon-Tae Kim),김해진(Hae-Jin Kim),김관천(Kwan-Chun Kim) 한국환경관리학회 2008 環境管理學會誌 Vol.14 No.2
1%, 2%, 10% 및 20%의 가교도를 가진 스타이렌(제4류 위험물) 디비닐벤젠 공중합체에 1-aza-18-crown-6 거대 고리 리간드를 치환반응으로 결합시켜 수지들을 합성하였으며, 이들 수지의 합성은 염소 함량과 원소 분석 그리고 IR-스펙트럼으로 확인하였다. 수지 흡착제에 대한 금속 이온의 흡착에 미치는 pH, 시간 그리고 수지의 가교도에 따른 영향들을 조사한 결과 금속 이온들은 pH 3 이상에서 큰 흡착율을 보였으며, 금속 이온들의 흡착 평형은 2시간 정도였다. 한편, 에탄올 용액에서 수지에 대한 흡착 선택성은 우라늄(UO₂²?) > 납(Pb²?) > 세륨(Ce³?) 이온이었고, 금속 이온의 흡착력은 1%, 2%, 10% 및 20%의 가교도 순이었다. Resins were synthesized with 1-aza-18-crown-6 macrocyclic ligand attached to styrene(dangerous matter) divinylbenzene(DVB) copolymer with crosslink of 1%, 2%, 10%, and 20% by substitution reaction. The synthesis of these resins was confirmed by content of chlorine, element analysis, and IR-spectrum. The effects of pH, time and crosslink on adsorption of metal ion by the synthetic resin adsorbent were investigated. The metal ion was showed fast adsorption on the resins above pH 3. The optimum equilibrium time for adsorption of metallic ions was about two hours. The adsorption selectivity determined in ethanol solution was in increasing order of uranium(UO22+) > lead(Pb2+) > cerium(Ce3+) ion. The adsorption was in the order of 1%, 2%, 10%, and 20% crosslink resin.