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경사 외부자장에 대한 600 kJ급 SMES용 HTS도체의 DC V-I 특성
이주영,마용호,류경우,최세용,김해종,Li, Zhu-Yong,Ma, Yong-Hu,Ryu, Kyung-Woo,Choi, Se-Yong,Kim, Hae-Jong 한국전기전자재료학회 2008 전기전자재료학회논문지 Vol.21 No.1
We are developing a small-sized high temperature superconducting magnetic energy storage (HTS-SMES) magnet with the nominal storage capacity of 600 kJ, which provides electric power with high quality to sensitive electric loads. Critical current and N-value of a high temperature superconductor with large current, which was selected for the development of the 600 kJ HTS-SMES magnet, were investigated in various oblique external magnetic fields. Based on the critical current and N-value measured for the short sample conductor, we discussed the DC V - I characteristic of a model coil fabricated with the same conductor of 500 m. The results show that the measured critical current and N-value of the conductor for parallel field are constant in external magnetic fields less than about 0.2 T. However, for oblique fields, its critical current and N -value abruptly decrease in all external magnetic fields. Moreover, the measured critical current of the model coil well agrees with the numerically calculated one based on the DC V - I characteristic measured for the short sample conductor. This suggest that losses and critical currents for an HTS-SMES magnet made up of a high temperature superconductor with anisotropic characteristic are predictable from the data of a short sample conductor.
a-IGZO TFT 기반 OLED 디스플레이 화소에 내장되는 OLED 열화 보상용 온도 센서의 개발
문승재 ( Seung Jae Moon ),김승균 ( Seong Gyun Kim ),최세용 ( Se Yong Choi ),이장후 ( Jang Hoo Lee ),이종모 ( Jong Mo Lee ),배병성 ( Byung Seong Bae ) 한국센서학회 2024 센서학회지 Vol.33 No.1
The quality of the display can be managed by effectively managing the temperature generated by the panel during use. Conventional display panels rely on an external reference resistor for temperature monitoring. However, this approach is easily affected by external factors such as temperature variations from the driving circuit and chips. These variations reduce reliability, causing complicated mounting owing to the external chip, and cannot monitor the individual pixel temperatures. However, this issue can be simply and efficiently addressed by integrating temperature sensors during the display panel manufacturing process. In this study, we fabricated and analyzed a temperature sensor integrated into an a-IGZO (amorphous indium-gallium-zinc-oxide) TFT array that was to precisely monitor temperature and prevent the deterioration of OLED display pixels. The temperature sensor was positioned on top of the oxide TFT. Simultaneously, it worked as a light shield layer, contributing to the reliability of the oxide. The characteristics of the array with integrated temperature sensors were measured and analyzed while adjusting the temperature in real-time. By integrating a temperature sensor into the TFT array, monitoring the temperature of the display became easier and more accurate. This study could contribute to managing the lifetime of the display.
원태희,최세용,양인숙 이화여자대학교 의과대학 2005 EMJ (Ewha medical journal) Vol.28 No.1
Background : The advances in surgical techniques and stabilizing devices have made the off-pump coronary artery bypass (OPCAB) popular, and good results have been published. We analyzed the early results of OPCAB performed in our hospital. Materials and Methods : Between January 2004 and December 2004, 23 patients underwent OPCAB. There were 14males and 9 females with mean age of 62.6± 10.3years. Preoperative diagnoses were unstable angina in 13(57%), acute myocardial infarction in 9(39%), and stable angina in 1(4%). Preoperative angiographic diagnoses were three-vessel disease in 12 (52%), two-vessel disease in 8(35%), one-vessel disease in 1(4%), and left main disease in 2(9%). Results : The mean number of grafts was 2.6 ±0.9 per patient. Vessels accessed were left anterior descending artery in 23, diagonal branch in 14, obtuse marginal branch in 9, right coronary artery in 12, and posterior descending artery in 1. Left internal mammary artery were used in 22 patients and bilateral internal mammary arteries were used in 1 patient. There was no operative mortality. Postoperative complications were cerebral vascular accident in 1, postoperative bleeding which required operative management in 2, arrhythmia including atrial fibrillation in 5, and minor operative wound problem in 1. Pre-discharge graft patency was evaluated in 11 patients. One internal mammary artery graft was occluded in 11 internal mammary artery graft evaluated. The patency rate was 91%. Seventeen saphenous vein grafts were patent in 19 saphenous vein grafts and the patency rate was 89%. Conclusion : Our result of OPCAB is promising and OPCAB is suggested to be the ideal technique with less morbidity and mortality.