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Micro spiral inductor를 이용한 2.5Gb/s급 2:1 Multiplexer 설계
김선중,최정명,범진욱,Kim, Sun-Jung,Choi, Jung-Myung,Burm, Jin-Wook 대한전자공학회 2007 電子工學會論文誌-SD (Semiconductor and devices) Vol.44 No.8
A 2.5Gb/s 2:1 multiplexer(MUX) IC using $0.18{\mu}m$ CMOS was designed and fabricated. Inductive peaking technology was used to improve the performance. On-chip micro spiral inductor was designed to maximize the inductive peaking effect without increasing the chip area much. The designed 4.7 nH micro-spiral inductor was $20\times20{\mu}m2$ in size. 2:1 MUX with and without micro spiral inductors were compared. The rise and fall time was improved more than 23% and 3% respectively using the micro spiral inductors for 1.25Gb/s signal. For 2.5 Gb/s signal, fall and rise time was improved 5.3% and 3.5% respectively. It consumed 61mW and voltage output swing was 1$180mV_{p-p}$ at 2.5Gb/s. [ $0.18{\mu}m$ ] CMOS공정을 이용하여 supply voltage 1.8V에서 2.5Gb/s 이상의 데이터 처리속도를 가지는 2:1 Multiplexer(MUX) 설계를 하였다. High speed 동작을 위한 주파수의 한계를 극복하기 위해서 4.7 nH의 on-chip micro spiral micro inductor $(20\times20{\mu}m2)$가 설계 되었고, 10개 이상의 inductor를 사용하고도 칩 면적 증가가 거의 없으면서 inductive peaking 효과를 극대화할 수 있었다. 칩 측정은 on-wafer로 진행되었고, micro spiral inductor가 있는 2:1 MUX와 그것이 없는 2:1 MUX 각각 측정하여 그 결과를 비교하였다. 측정결과 micro spiral inductor를 가진 2:1MUX가 rise time과 fall time이 1.25Gb/s에서는 rise time이 23%, fall time은 3%의 peaking 개선 효과가 있는 것을 확인하였다. 2.5Gb/s에서는 fall time이 약 5.3%, rise time 3.5%의 개선 효과를 보았다. 전체 소비전력은 61.2mW, 2.5Gb/s에서 voltage output swing은 $180mV_{p-p}$로 측정되었다.
하이드라진 방법에 의한 ZnO 미분말의 합성 및 에탄올 감응성
김선중,이종흔,Kim, Sun-Jung,Lee, Jong-Heun 한국재료학회 2008 한국재료학회지 Vol.18 No.11
ZnO nanopowders were synthesized by the sol-gel method using hydrazine reduction, and their gas responses to 6 gases (200 ppm of $C_2H_5OH$, $CH_3COCH_3$, $H_2$, $C_3H_8$, 100 ppm of CO, and 5 ppm of $NO_2$) were measured at $300\;{\sim}\;400^{\circ}C$. The prepared ZnO nanopowders showed high gas responses to $C_2H_5OH$ and $CH_3COCH_3$ at $400^{\circ}C$. The sensing materials prepared at the compositions of [$ZnCl_2$]:[$N_2H_4$]:[NaOH] = 1:1:1 and 1:2:2 showed particularly high gas responses ($S\;=\;R_a/R_g,\;R_a$ : resistance in air, $R_g$ : resistance in gas) to 200 ppm of $C_2H_5OH$($S\;=\;102.8{\sim}160.7$) and 200 ppm of $CH_3COCH_3$($S\;= 72.6{\sim}166.2$), while they showed low gas responses to $H_2$, $C_3H_8$, CO, and $NO_2$. The reason for high sensitivity to these 2 gases was discussed in relation to the reaction mechanism, oxidation state, surface area, and particle morphology of the sensing materials.
하이드라진을 이용한 용액환원법에 의한 Ni-GDC 미분말 합성과 전기적 특성
김선중,김강민,조평석,조윤호,이충용,박승영,강윤찬,이종흔,Kim, Sun-Jung,Kim, Kang-Min,Cho, Pyeong-Seok,Cho, Yoon-Ho,Lee, Choong-Yong,Park, Seung-Young,Kang, Yun-Chan,Lee, Jong-Heun 한국재료학회 2008 한국재료학회지 Vol.18 No.12
Ni-GDC (gadolinia-doped ceria) composite powders, the anode material for the application of solid oxide fuel cells, were prepared by a solution reduction method using hydrazine. The distribution of Ni particles in the composite powders was homogeneous. The Ni-GDC powders were sintered at $1400^{\circ}C$ for 2 h and then reduced at $800^{\circ}C$ for 24 h in 3% $H_2$. The percolation limit of Ni of the sintered composite was 20 vol%, which was significantly lower than these values in the literature (30-35 vol%). The marked decrease of percolation limit is attributed to the small size of the Ni particles and the high degree of dispersion. The hydrazine method suggests a facile chemical route to prepare well-dispersed Ni-GDC composite powders.
Spiral micro inductor를 사용한 20Gb/s급 저면적 2:1 Multiplexer 설계
김선중(Sun-Jung Kim),범진욱(Jin-Wook Burm) 대한전자공학회 2007 대한전자공학회 학술대회 Vol.2007 No.7
A 20Gb/s 2:1 multiplexer(MUX) IC using 0.13㎛ CMOS was designed and fabricated. Inductive peaking technology was used to improve the performance. The designed 4.662nH micro-spiral inductor was 20×20㎛² in size. 2:1 MUX with and without micro spiral inductors were compared. The rise and fall time was improved more than 7.1% and 9.3% using the micro spiral inductors and capacitance cancellation technique for 20Gb/s signal It consumed 35㎽ and voltage output swing was 300㎷p-p at 20Gb/s.
김선중(Kim Sun-Joong),김수영(Kim Soo-Young),김정태(Kim Jung-Tae),홍윤혁(Hong Yun-Hyuk) 한국철도학회 2009 한국철도학회 학술발표대회논문집 Vol.2009 No.11월
In this paper, we studied on biomimetic method which applied at high speed train design. For using this method we have to consider about many constraints those involved in engineering, economical and ethnical demands. During the research about these constraints, we limit the field of a scope to adapt at a train. The Boxfish usually live in near by the rapid current area under the ocean. Time goes on a Boxfish evolved like raindrops and finally they got the outlines which optimized at their living environment. So adapt these features at train for get low resistance characteristic in high speed driving case. And compare HSR 350 with designed high speed train by this study. Based on 4 criteria(Cd, Vortex, Pressure, Velocity), we objectively estimate the improvement of the new designed model. 본 논문에서는 저 저항 고속철도 전두부 디자인을 생체모방의 측면에서 접근하였다. 고속전철 전두부 디자인에 생체 모방 기법을 적용한 예는 그리 많지 않다. 특히 생체모방기법의 적용은 공학적 요구조건을 만족시켜야 할 뿐 아니라 경제적, 미학적 요구조건도 만족시킬 수 있어야 한다. 따라서 공학적 요구조건인 공기저항의 감소와, 경제적 요구조건을 충족시키기 위해 전두부 Nose 길이를 최소한으로 줄이고 단면을 사각형으로 유지할 수 있는 디자인을 목표를 설정했다. 생체모방 대상 모델로 Boxfish(거북복)을 선정하였다. 거북복의 선정은, Nose가 짧고 단면이 사각형이면서도 항력계수가 자유낙하 하는 물방울과 비슷하게 작기 때문이다. 거북복을 고속전철에 생체모방한 모델과 현재 시험운행단계를 마친 한국형 고속전철 HSR_350모델의 CFD해석을 통해 비교하고, 생체모방하여 얼마의 성과를 내었는가를 Cd, Vortex, Pressure, Velocity를 기준으로 삼아 객관적으로 평가하였다.