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큰 관상동맥 병변에서 약물방출스텐트와 금속스텐트의 임상경과 비교
김우종 ( Woo Jong Kim ),조장현 ( Jang Hyun Cho ),정종혁 ( Jong Heok Jung ),이민근 ( Min Kun Lee ),윤재성 ( Jae Sung Yoon ),안용수 ( Young Soo Ahn ),황영준 ( Young Jun Hwang ),정홍명 ( Hong Myung Jung ),김수현 ( Su Hyun Kim ),김준 대한내과학회 2011 대한내과학회지 Vol.80 No.6
Background/Aims: Drug-eluting stents (DES) are superior to bare metal stents (BMS) in reducing restenosis rates across a wide range of patients and lesion subsets.This study compared the clinical outcomes of DES versus BMS in patients with large coronary Methods: The study compared 134 patients (59.9±10.6 years, 90 men, 44 women) who underwent single vessel angioplasty with DESimplantation in large vessels with 115 patients (60.3±8.9 years, 82 men, 33 women) who received BMS. The clinical outcomes at 12 months were compared between groups. The study end points were major adverse cardiac events (MACE), including cardiac death, nonfatal myocardial infarction, and the need for target vessel and target lesion revascularization. Results: The baseline clinical coronary angiography and procedural characteristics were similar in both groups. The duration of dual antiplatelet therapy was longer in the DES group than in the BMS group (240±2.7 vs. 348±1.7 days, p=0.042). During the 12-month clinical follow-up, MACE were observed in 13 patients (11.3%) with BMS and 12 patients (9.0%) with DES (p=0.486). Conclusions: For coronary stents implanted in large coronary arteries, DES seems to be more favorable, although no significant differences were observed in the clinical outcomes between DES and BMS during a 1-year clinical follow-up. (Korean J Med2011;80:664-671)
사면 및 터널에서의 암반 파쇄대 보강을 위한 개량형 록볼트 개발
김수로 ( Soo Lo Kim ),김종태 ( Jong Tae Kim ),박성철 ( Seong Cheol Park ),김태혁 ( Tae Heok Kim ),권현호 ( Hyun Ho Kwon ),정교철 ( Gyo Cheol Jeong ) 대한지질공학회 2010 지질공학 Vol.20 No.1
대규모 도로사면의 경우 대부분 소단 형식의 계단식 절개사면인 경우가 많다. 특히 단층파쇄대와 동반된 절개사면은 안정성 확보를 위해 특별한 보강공법이 요구된다. 이러한 특이 사면에서의 경우는 지질적 특성 때문에 기존 사면 보강공법으로는 어려운 경우가 많다. 특히 파쇄대 발달 구간에서는 굴착과 발파로 인해 암반 내 블록의 움직임 및 불연속면의 간극이 확대되어 사면의 안전율이 크게 낮아진다. 이로 인해 파쇄대의 지질적 특성에 따른 효율적인 보강대책공법 개발이 필요하나 현재까지의 지보재로는 그 적용성에 한계가 있다. 따라서 사면 및 터널 내 특이 파쇄대 구간의 효율적인 안정성확보를 위해 특화된 록볼트 공법 개발이 필요하다. 본 연구에서는 이를 위해 최근 특이 암반파쇄대 구간에서 전면 마찰형으로 사용되는 스웰렉스 볼트 공법의 지보효과를 증대시키는 새로운 개량형 록볼트를 개발하는데 목적을 두고 있다. There are many slopes generally developed by excavation and cut slope with small steps on massive slopes of roads. Especially these cut slopes which excavating around fault fracture zone need a reinforcement technology in order to ensure safety. In the case of slope excavation, it is difficult to use the existing slope support at fracture zone because of geological characteristics. Especially the factor of safety decreases significantly due to the movement of blocks in bed rocks and the expansion of interspace of discontinuous planes in fractured zones caused by excavation. Thus an efficient reinforcement technique in accordance with geological properties of fracture zones needs to be developed because the existing slope support has a restricted application. Therefore it is necessary to develop the specialized rock bolt technique in order to ensure an efficient factor of safety for anomalous fracture zones in slopes and tunnels. The purpose of this study is to develop newly improved rock bolt to increase a supporting effect of the swellex bolt method used recently as a friction type in fracture zones.
金澤基,周赫鍾 충남대학교 1977 工業技術開發硏究所論文集 Vol.4 No.1
The change of the magnetic properties and the crystal structure of the electrodeposited Fe-Ni alloy films as a function of the concentration of Fe and Ni in the electrodeposited solution has been investigated systematically. The following results were obtained; 1) Invar (35% Ni-Fe) film is electrodeposited in a Ni electrodeposited solution(NiSO_4·7H_2O 300gr/l) containing FeSO_4·7H_2O 260gr/l. In this case, the saturation magnetization(Ms), the coercive force (Hc) and the square ratio (Mr/Ms) were 750 gauss, 320 Oe and 69% respectively, and the crystal structure was mixed with bcc and fcc. 2) Isoperm (50% Ni-Fe) film is electrodeposited in a Ni electrodeposited solution containing FeSO_4·7H_2O 140gr/l. In this case, the Ms, the Hc and Mr/Ms were 1290 gauss. 190 Oe and 81% respectively, and the crystal structure was fcc. 3) Permalloy(80% Ni-Fe) film is electrodeposited in a Ni electrodeposited solution containing FeSO_4·7H_2O 60gr/l. In this case, the Ms, Hc and Mr/Ms were 820 gauss, 190 Oe and 93% respectively, and the crystal structure was fcc.
A hybrid generator for two-axis vibration energy scavenging applications
박종철(Jong Cheol Park),김민수(Min Soo Kim),홍준혁(Jun Heok Hong),나큰돌(Keun Dol Na),김형주(Hyung Joo Kim),박재영(Jae Yeong Park) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.7
A hybrid vibration energy harvester was investigated to scavenge power from two axis vibration source. In order to convert two-axis vibration to electrical power, we developed beam-type vibratory energy harvester with inertial mass which had a asymmetric and curved shape. Furthermore, it was designed by combining the piezoelectric and electromagnetic transducer to increase harvested electrical power. The piezoelectric bender and the NdFeB magnet was utilized as a spring beam and and inertial mass. The copper wire-wounded coil was formed and fixed upon the NdFeB magnet. From above structure, the theoretical analysis for several tens ㎐ of vibration was investigated.