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초내열 합금 Alloy718의 저주기 피로시험에서 반복연화 및 R=X (X=0,-1)효과
최병학,신수근,신정근,김선화,윤기봉,염종택,박노광 국립7개대학공동논문집간행위원회 2005 공업기술연구 Vol.5 No.-
The LCF properties for R=0 as tension-tension and R=-1 as tension-compression were examined in DA alloy718. While the hysteresis loops composed of ?ε_(t), ?ε_(p) and ?σ were figured with similaity in both of R=0 and R=-1, the loops of R=0 were continuely going down along the stress axis during cyclic fatigue progressing. It was caused by Bauschinger effect, which includes a tendancy for stress recovering as an amount of compression stress. The phenomena of cyclic softening in both of R=0 and R=1 seem to be caused by planar slip of dislocations, which was accompanied by shearing the γ'/γ" precipitates during the cyclic fatigue test.
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Cancer Cell Growth in the Near Infrared Region by Using Silica Coated Gold Nanorods
Tuntun Wang,Kwi Seok Yeom,Sitansu Sekhar Nanda,Seong Soo A. An,Dong Kee Yi 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2020 NANO Vol.15 No.02
Gold nanorods (AuNRs) have been considered as suitable materials for diverse biomedical applications in controlling cell behaviors. The nanoisland system with well-dispersed silica coated Au nanorods (Si-AuNRs) was used to demonstrate the enhanced cell growth of normal and cancer cells (MDA-MB-231 mammalian breast cancer cells) from the induced expressions of the heat shock proteins (HSPs). The over-expressions of HSP could help in protein folding in cell pro-liferations and growths of both the normal and cancer cells. In the current study, interesting mechanisms of cancer cell growth with Si-AuNRs than the conventional systems, such as incubator, would be presented. We believe that the growth of cancer cells in near infrared (NIR) region using Si-AuNRs induced the activities of HSPs, which could help the protein folding in cell growth and survival in comparison to the cells grown in the incubator only. The cell growth enhancing technology could be expanded in diverse applications in cell culture systems.
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오동주,염기수,Oh Dong-joo,Yeom Kee-soo 한국정보통신학회 2004 한국정보통신학회논문지 Vol.8 No.8
본 논문에서는 차세대 RF 전력 소자로 기대하고 있는 LDMOST의 BV(Breakdown; 항복전압) 특성을 향상시키는 새로운 구조를 제안하였다. 제안한 구조는 외부 전계 링이라 하며 드리프트 영역 둘레에 3차원적인 구조로 형성된다. 외부 전계 링은 드리프트 영역에서 전계를 완화시키는 역할을 함으로써 BV 특성을 향상시키는 효과를 얻을 수 있다. 3차원 TCAD 시뮬레이션 결과, 외부 전계 링의 접합깊이와 도핑 농도의 증가에 따라 LDMOST의 BV가 증가함을 확인할 수 있었다. 따라서 기존의 p+ sinker 공정을 사용하여 외부 전계 링 구조를 추가한다면 LDMOST의 BV 특성을 크게 향상 시킬 수 있다. In this paper, we have proposed a new structure of LDMOST, which has been expected as a next generation RF power device, to improve the BV(Breakdown Voltage) characteristics. The proposed structure, named external field ring, is formed around a drift region by the three dimensional structure. The external field ring relieves the electric field in the drift region and improves the BV characteristics. By the three dimensional TCAD simulations, it was found that the BV of LDMOST was increased by the increase of the junction depth and doping concentration of the external field ring. Therefore, the BV characteristics of the LDMOST can be remarkably improved by addition of external field ring using an existing p+ sinker process.
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전류 재사용 기법을 이용한 저전력 CMOS LNA 설계
조인신,염기수,Cho In-Shin,Yeom Kee-Soo 한국정보통신학회 2006 한국정보통신학회논문지 Vol.10 No.8
This paper presents a design of low power CMOS LNA(Low Noise Amplifier) for 2.4 GHz ZigBee applications that is a promising international standard for short area wireless communications. The proposed circuit has been designed using TSMC $0.18{\mu}m$ CMOS process technology and two stage cascade topology by current reuse technique. Two stage cascade amplifiers use the same bias current in the current reused stage which leads to the reduction of the power dissipation. LNA design procedures and the simulation results using ADS(Advanced Design System) are presented in this paper. Simulation results show that the LNA has a extremely low power dissipation of 1.38mW with a supply voltage of 1.0V. This is the lowest value among LNAs ever reported. The LNA also has a maximum gain of 13.38dB, input return loss of -20.37dB, output return loss of -22.48dB and minimum noise figure of 1.13dB. 본 논문에서는 단거리 무선 통신의 새로운 국제 표준으로 부상하고 있는 2.4 GHz ZigBee 응용을 위한 저전력 CMOS LNA(Low Noise Amplifier)를 설계하였다. 제안한 구조는 전류 재사용 기법을 이용한 2단 cascade구조이며 회로의 설계에서 TSMC $0.18{\mu}m$ CMOS 공정을 사용하였다. 전류 재사용단은 두 단의 증폭기 전류를 공유함으로써 LNA의 전력 소모를 적게 하는 효과를 얻을 수 있다. 본 논문에서는 LNA설계 과정을 소개하고 ADS(Advanced Design System)를 이용한 모의실험 결과를 제시하여 검증하였다. 모의실험 결과, 1.0V의 전압이 인가될 때 1.38mW의 매우 낮은 전력 소모를 확인하였으며 이는 지금까지 발표된 LNA 중 가장 낮은 값이다. 또한 13.83dB의 최대 이득, -20.37dB의 입력 반사 손실, -22.48dB의 출력 반사 손실 그리 고 1.13dB의 최소 잡음 지수를 보였다.
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Chu, Hee Ho,Choi, Seung Hong,Ryoo, Inseon,Kim, Soo Chin,Yeom, Jeong A,Shin, Hwaseon,Jung, Seung Chai,Lee, A Leum,Yoon, Tae Jin,Kim, Tae Min,Lee, Se-Hoon,Park, Chul-Kee,Kim, Ji-Hoon,Sohn, Chul-Ho,Park, Radiological Society of North America 2013 Radiology Vol.269 No.3
<P>To explore the role of histogram analysis of apparent diffusion coefficient (ADC) maps obtained at standard- and high-b-value (1000 and 3000 sec/mm(2), respectively) diffusion-weighted (DW) imaging in the differentiation of true progression from pseudoprogression in glioblastoma treated with radiation therapy and concomitant temozolomide.</P>
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