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액체소듐속에서 소듐-물반응에 의한 재질의 Wastage현상
정경채,정지영,김병호,김태준,최병해,최종현,김의식 한국공업화학회 2003 응용화학 Vol.7 No.1
In this study we observed and analyzed the corrosion phenomena in leak site and the effect on temperature at the target surface of heat transfer tube material by sodium-water reaction through water leakage in liquid sodium atmosphere. Surrounding of leak hole of the specimen was damaged by the wastage phenomena due to corrosion and erosion of material, and hole size by damage of leak site was extended from 150㎛ to about 200㎛. Also, the damaged size appeared in the target surface was observed to about 1000㎛ diameter. The temperature of target surface increased about 70~80℃ by the heat of sodium-water reaction even with the small leakage of 15㎖ water. From the results of EPMA and EDX analysis, damaged area are found to covered with complex compounds such as (NaOH+Na_2O) FexOy or (NaCrO_2+nA_2CrO4) mixed up with the sodium oxides by sodium-water reaction and the Fe or Cr element by matrix of tube sodium oxides by matrix of tube material.
Effect of Ionizing Radiation on Rat Tissue: Proteomic and Biochemical Analysis
Park*, Eui‐,Chul,Yoon, Jong‐,Bok,Seong*, Jin‐,Sil,Choi, Kyoung‐,Soo,Kong, Eung‐,Sik,Kim, Yun‐,Jeong,Park, Young‐,Mee,Park, Eun‐,Mi Taylor Francis 2006 Preparative biochemistry & biotechnology Vol.36 No.1
<P>Reactive oxygen species (ROS), generated by ionizing radiation, has been implicated in its effect on living tissues. We confirmed the changes in the oxidative stress markers upon irradiation. We characterized the changes in the proteome profile in rat liver after administering irradiation, and the affected proteins were identified by MALDI-TOF-MS and ESI-MS/MS. The identified proteins represent diverse sets of proteins participating in the cellular metabolism. Our results demonstrated that proteomics analysis is a useful method for characterization of a global proteome change caused by ionizing radiation to unravel the molecular mechanisms involved in the cellular responses to ionizing radiation.</P>
유영철,이 원,윤인식,정의섭 韓國非破壞檢査學會 1995 한국비파괴검사학회지 Vol.15 No.4
전자 부품의 일종인 LSI 패키지의 제조 과정에서 절연·방진·방습 등을 목적으로 수지 몰딩이 널리 사용되고 있는데, 냉각과정에서 금속과 수지의 계면에 접합 잔류열응력이 발생하여 파괴의 원인이 되고 있다. 접합 잔류열응력의 측정에는 X선 회절법등이 사용되지만 측정상의 어려움과 계면단 응력특이성에 대한 해석의 곤란함 때문에 적절한 모델링에 따른 수치해석적 연구가 새로이 주목을 받고 있다. 본 연구에서는 Al/Epoxy를 몰딩 접합한 세가지의 대표적인 계면 형상을 선정하여 계면에서의 잔류열응력을 경계요소 수치 해석 및 스트레인 게이지를 이용한 실험을 통하여 각각 해석하였다. 수치해석과 실험결과는 정상적으로 잘 일치하였으며, 서브 요소를 사용하므로써 계면단 응력 특이성의 해석 정밀도를 향상시킬 수 있었다. 또한 접합 잔류열응력의 해석결과로부터 수직응력에 의한 계면 박리가 예상되고, 피착체의 두께가 증가할수록 응력 특이성이 강하게 나타남을 확인하였다. In general residual stress is measured by X-ray diffraction method but in case of bonding residual thermal stress it is inadequate technique to examine the stress singularity. Therefore Two-dimensional elastic boundary element analyses were carried out to investigate the residual thermal stress and stress singularity of bonding interface in Al/Epoxy. This boundary element results were compared with the strain gauge measurements. The effects of different interface models, sub-elements and adherend thickness are presented and discussed. On the basis of the obtained results, interface delamination causing by normal stress is expected and stress singularity is observed more intensively increasing with adherend thickness. It is concluded that the bonding strength of Al/Epoxy interface can be estimated correctly by taking into account the stress singularity at the edge of the interface.
Eui-Young Jeong,Jun-Sik Yoon,Chang-Ki Baek,Ye-Ram Kim,Jae-Ho Hong,Jeong-Soo Lee,Rock-Hyun Baek,Yoon-Ha Jeong Institute of Electrical and Electronics Engineers 2015 IEEE transactions on electron devices Vol. No.
<P>In this brief, we systematically investigated the effects of fin pitch (FP) and fin height (H<SUB>fin</SUB>) on parasitic resistances and capacitances to achieve the best RC delay, which is an adequate metric of the ac behavior of FinFETs, for Si bulk n/pFinFETs in system-on-a-chip applications. The RC delays were directly extracted from the fully calibrated technology computer aided design I-V/C-V simulation results and quantitatively analyzed using parasitic capacitance components, including a middle-of-the line configuration up to Metal 1. When FP increased, the RC delay likewise increased due to greater C<SUB>gg</SUB>. On the other hand, the RC delay mostly decreased due to greater ON-current as the H<SUB>fin</SUB> increased. The RC delay with different power supply voltages (V<SUB>DD</SUB> = 0.55 and 0.75 V) was also studied to see the effect of V<SUB>DD</SUB> scaling. Finally, a selective deposition was suggested to improve the RC delay about 13%.</P>
LPG 가스분사 방식 연료공급시스템의 관로 유동해석에 관한 연구
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),정태형(Tae-hyuung Jeong) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
The gaseous fuel injection (GFI) type in LPG fuel supply system has more advantage than the liquified fuel injection type to overcome SULEV emission regulation. But in GFI system, to control pressure and temperature of gaseous fuel is needed to get precision fuel metering for the compressible characteristic of gaseous fuel. In this study, the effects of pressure and temperature on the fuel metering was simulated by commercial flow network analysis package, Flowmaster. And the fuel composition effects on the fuel metering were also studied to figure out the fuel metering characteristics.
윤정의(Jeong-Eui Yun),김명환(Myung-Hwan Kim),남현식(Hyeon-Sik Nam),정태형(Tae-Hyung Jeong) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The vaporizer is the core component in the LPG gas injection engine. Its major function is to change liquid phase LPG fuel into gas phase using hot coolant as heat source. Therefore, it is important to improve the efficiency of heat exchange between coolant and LPG fuel. In this study, using the commercial thermal and fluid analysis code STAR-CD, we studied computational thermal and fluid analysis to figure out the heat exchange phenomena in vaporizer. Finally, the comparison between original and modified coolant passage was simulated on the efficiency of heat exchange.
Junction Design Strategy for Si Bulk FinFETs for System-on-Chip Applications Down to the 7-nm Node
Jun-Sik Yoon,Eui-Young Jeong,Chang-Ki Baek,Ye-Ram Kim,Jae-Ho Hong,Jeong-Soo Lee,Rock-Hyun Baek,Yoon-Ha Jeong IEEE 2015 IEEE electron device letters Vol.36 No.10
<P>DC/AC characteristics of Si bulk FinFETs including middle-of-line levels are precisely investigated using well-calibrated 3-D device simulations for system-on-chip applications. Scaling the fin widths down to 5 nm effectively enhances gate-to-channel controllability and improves RC delay, but a dramatic increase in band-to-band tunneling currents from source-to-drain does not satisfy low-power application in the 7-nm node. All lightly-doped extension regions as a solution could improve band-to-band tunneling currents and total gate capacitances because of better short-channel immunity and lower parasitic capacitances, respectively. Using systematic TCAD-based RC calculation, we suggest optimized overlap/underlap lengths in the 7-nm node FinFETs to overcome the scaling limitations.</P>
우관식(Koan Sik Woo),정지영(Ji Young Jeong),황인국(In Guk Hwang),이윤정(Yoon Jeong Lee),이연리(Youn Ri Lee),박희정(Hee-Jeong Park),박의석(Eui Seok Park),정헌상(Heon Sang Jeong) 한국식품영양과학회 2009 한국식품영양과학회지 Vol.38 No.3
유자씨 추출물의 항산화성분 및 항산화활성에 대한 최적 추출조건을 선정하기 위하여 추출온도(30~70℃; X₁), 추출시간(1~5시간; X₂) 및 교반속도(200~600 rpm; X₃)를 독립변수로 추출된 추출물의 추출수율, 총 polyphenol 함량, DPPH radical 소거활성 및 아질산염소거활성을 측정하였다. 추출수율의 최적조건은 추출온도, 추출시간 및 교반속도 각각 50.23℃, 3.03시간, 400.06 rpm으로 최대 20.23%로 예측되었으며, 총 폴리페놀 함량의 최적조건은 49.88℃, 2.72시간 및 400.39 rpm으로 최대 4.37 ㎎/g으로 예측되었다. DPPH radical 소거활성은 각각 50.28℃, 3.42시간 및 399.96 rpm으로 최대 49.69%로 예측되었으며, 아질산염소거활성은 추출온도, 추출시간 및 교반속도 각각 49.19℃, 0.68시간 및 602.95 rpm으로 최대 47.79%로 예측되었다. 이상의 결과를 바탕으로 유자씨 추출물의 항산화활성을 위한 최적 조건은 추출온도, 추출시간 및 교반속도가 각각 50℃, 3시간, 400 rpm로 결정하였으며, 이 조건에서 추출물을 제조하여 추출수율, 총 폴리페놀 함량, DPPH radical 소거활성 및 아질산 염소거활성을 측정한 결과 각각 20.31%, 4.22 ㎎/g, 49.54% 및 44.30%로 나타났다. Extraction characteristics of citron (Citrus junos Sieb. ex Tanaka) seeds and functional properties of corresponding extract were monitored by response surface methodology (RSM). Maximum extraction yield of 20.23% was obtained at extraction temperature of 50.23℃, extraction time of 3.03 hr, and shaking velocity of 400.06 rpm. At extraction temperature, extraction time, and shaking velocity of 49.88℃, 2.72 hr, and 400.39 rpm, respectively, maximum polyphenol content was 4.37 mg/g. At extraction temperature, extraction time, and shaking velocity of 50.28℃, 3.42 hr, and 399.96 rpm, respectively, maximum electron donating ability (EDA) was 49.69%. Maximum nitrite scavenging activity (NSA) was 47.79% at extraction temperature, extraction time, and shaking velocity of 49.19℃, 0.68 hr, and 602.95 rpm, respectively. Based on superimposition of 3-dimensional RSM with respect to extraction yield, polyphenol, EDA, and NSA, optimum ranges of extraction conditions were extraction temperature of 50℃, extraction time of about 3 hr, and shaking velocity of 400 rpm.