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2G HTS Magnet With Smart Insulation Method
Jo, Young-Sik,Kim, Hyung-Wook,Kim, Seog-Whan,Kim, Doohun,Ko, Rock-Kil,Ha, Dong-Woo,Park, Heui Joo,Kim, Ho Min,Ahn, Dong-Gyun,Hong, Jung-Pyo,Hur, Jin,Kim, Seok-Beom Institute of Electrical and Electronics Engineers 2018 IEEE transactions on applied superconductivity Vol.28 No.3
<P>This paper proposes an advanced method to satisfy both the stability and charging/discharging time constant requirements of second generation high-temperature superconductor (2G HTS) magnets. This novel method entails installing metal–insulator transition (MIT) material between the turns of the 2G HTS magnets. The MIT material acts as an insulator when the temperature is lower than a certain value. Above this temperature, the MIT material becomes a conductor. This transition can be used as a switch between the turns of the 2G HTS magnets. We refer to this temperature-dependent smart switch as “smart insulation.” Considering the operating temperature, we selected V<SUB>2</SUB>O<SUB>3</SUB> as the material for smart insulation. We have experimentally verified that the advantages of both the insulation magnet (in the superconducting state) and no-insulation magnet (during quenching) can be simultaneously realized.</P>
Enhancement of 2G HTS Coil Stability With V2O3 and Perforated HTS Wire
Kim, Hyung-Wook,Jo, Young-Sik,Kim, Seog-Whan,Ha, Dong-Woo,Ko, Rock-Kil,Kim, Doohun,Hur, Jin IEEE 2018 IEEE transactions on applied superconductivity Vol.28 No.3
<P>In this paper, we propose an improved wire structure that easily causes current bypass when the vanadium (III) oxide (V<SUB>2</SUB>O<SUB>3</SUB>) material is applied turn-to-turn in 2G HTS no-insulation coils. A characteristic of the V <SUB>2</SUB>O<SUB>3</SUB> material is that when a quench causes the coil temperature to rise the turn-to-turn resistance is lowered and current is bypassed. However, due to the high material resistance of the original 2G HTS wire, the turn-to-turn resistance is large and the resulting amount of bypassed current is small. Therefore, in order to reduce the turn-to-turn resistance of the original 2G HTS coil, a short sample test of the perforated wire was performed. We also applied the proposed method to the coil and verified its validity through experimental results.</P>
4개월간 단일 군병원에서 시행된 복강경 충수절제술의 임상결과
김도훈 ( Doohun Kim ),이윤현 ( Yoonhyun Lee ),신홍경 ( Hongkyung Shin ) 국군의무사령부 2021 대한군진의학학술지 Vol.52 No.1
Objective; Laparoscopic appendectomy became the standard operation to treat appendiceal diseases. Despite the increase in the frequency of surgeries in military hospitals, there has been no objective comparative study so far. This study aims to obtain clinical outcomes of surgery performed in military hospital and compare them with outcomes reported in civilian clinical studies. Method; We requested patient information who underwent laparoscopic appendectomy in the Armed Forces Capital Hospital from January 01, 2020 to April 30, 2020. 100 patients was enrolled in this study and surgery-related factor, patient demographics were analyzed retrospectively. Subgroup analysis was performed to reveal clinical differences between officer and soldier group. Result; Most of patients were male(99%) and mean age of all patients was 21.8±3.3 years. Postoperative complication rate was 2 percent and there were no postoperative complications greater than the Clavien-Dindo classification IIIA. Mean length of stay(LOS) in all patients were 10.5±13.2 days. In subgroup analysis, there were no statistically significant differences in terms of complicated cases and LOS, postoperative complication rate between officer and soldier group. Conclusion; Clinical outcomes of laparoscopic appendectomy performed in military hospital can be considered comparable and not inferior to those of civilian hospitals.