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Kim, You Song,Chun, Byong Sun,Kim, Deok-kee,Hwang, Jae Yeon,Kim, Soon Sub,Rhee, J.R.,Kim, Keewon,Kim, Taewan,Kim, Young Keun IEEE 2006 IEEE transactions on magnetics Vol.42 No.10
The typical double-barrier magnetic tunnel junction (DMTJ) structure examined in this paper consists of a Ta 45/Ru 9.5/IrMn 10/CoFe 7/AlO<SUB>x</SUB>/free layer/AlO<SUB>x</SUB>/CoFe 7/IrMn 10/Ru 60 (nm). The free layer consists of an Ni<SUB>16</SUB>Fe<SUB>62</SUB>Si<SUB>8</SUB>B<SUB>14</SUB> 7 nm, Co<SUB>90</SUB>Fe<SUB>10</SUB> (fcc) 7 nm, or CoFe t<SUB>1</SUB>/NiFeSiB t<SUB>2</SUB>/CoFe t<SUB>1</SUB> layer in which the thicknesses t<SUB>1</SUB> and t<SUB>2</SUB> are varied. The DMTJ with an NiFeSiB-free layer had a tunneling magnetoresistance (TMR) of 28%, an area-resistance product (RA) of 86 k Ω μm<SUP>2</SUP>, a coercivity (H<SUB>c</SUB>) of 11 Oe, and an interlayer coupling field (H<SUB>i</SUB>) of 20 Oe. To improve the TMR ratio and RA, a DMTJ comprising an amorphous NiFeSiB layer that could partially substitute for the CoFe free layer was investigated. This hybrid DMTJ had a TMR of 30%, an RA of 68 k Ωμ m<SUP>2</SUP>, and a H<SUB>c</SUB> of 11 Oe, but an increased H<SUB>i</SUB> of 37 Oe. We confirmed by atomic force microscopy and transmission electron microscopy that H<SUB>i</SUB> increased as the thickness of NiFeSiB decreased. When the amorphous NiFeSiB layer was thick, it was effective in retarding the columnar growth which usually induces a wavy interface. However, if the NiFeSiB layer was thin, the roughness was increased and H<SUB>i</SUB> became large because of the magnetostatic Ne´el coupling.
Perceptual Crosstalk Prediction on Autostereoscopic 3D Display
Kim, Taewan,Kim, Jongyoo,Kim, SeongYong,Cho, Sungho,Lee, Sanghoon IEEE 2017 IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS FOR VIDE Vol.27 No.7
<P>Perceptual crosstalk prediction for autostereoscopic 3D displays is of fundamental importance in determining the level of quality perceived by humans in terms of the display performance and the 3D viewing experience. However, no robust framework exists to quantify perceptual crosstalk while taking into account the hardware structure of a display as well as its content characteristics via content analysis. In this paper, we present a 3D perceptual crosstalk predictor (3D-PCP) that can be used to predict crosstalk in a unique way when viewing autostereoscopic 3D displays. 3D-PCP captures hardware features using an optical Fourier transform-light measurement device and content features through content analysis based on information theory. By deriving the disparity, luminance, color, and texture maps, this approach defines the visual entropy, mutual information, and relative entropy in order to investigate the influences of the 3D scene characteristics on perceptual crosstalk. The experimental results demonstrate that the 3D-PCP output is highly correlated with subjective scores.</P>
Kim, Dongbin,Kim, TaeWan,Jin, Yinhua,Mun, Jihun,Lim, In-Tae,Kim, Ju-Hwang,Kim, Taesung,Kang, Sang-Woo The Korean Vacuum Society 2016 Applied Science and Convergence Technology Vol.25 No.2
The surface flatness of metal meshes in a deflector of particle beam mass spectrometer (PBMS) required ideally flat, and this can specify the particle trajectories which goes through the detector. In this research, charged particle current was measured using the different surface roughness deflectors. NaCl particles were generated monodispersed in its size by using differential mobility analyzer and the whole processes were followed the way calibrating PBMS. The results indicate that the mesh surface morphology in the deflector can affect to the particle size and the concentration errors, and sensitivity of PBMS.
Impact of Sb Incorporation on MOVPE-Grown “Bulk” InGaAs(Sb)N Films for Solar Cell Application
Kim, Taewan,Wood, Adam,Kim, Honghyuk,Kim, Youngjo,Lee, Jaejin,Peterson, Mark,Sin, Yongkun,Moss, Steven,Kuech, Thomas F.,Babcock, Susan,Mawst, Luke J. IEEE 2016 IEEE journal of photovoltaics Vol.6 No.6
<P>We have investigated the impacts of Sb incorporation on the microstructural, optical, electrical, and carrier dynamics properties of bulk InGaAsSbN films in a comparative study of In-GaAsN and InGaAsSbN materials grown by metal-organic vapor phase epitaxy (MOVPE). These films were grown at the relatively high temperature of 600 degrees C and annealed at 800 degrees C for 30 min. Transmission electron microscopy studies indicate compositional and structural homogeneity of the InGaAsN and InGaAsSbN films. Low-temperature time-resolved photoluminescence measurements of the MOVPE-grown InGaAsN film show a longer minority carrier lifetime (similar to 40 ns) than observed for the InGaAsSbN film (similar to 26 - 27 ns). In addition, single-junction solar cells with an InGaAsN (In-GaAsSbN) base layer exhibit an open-circuit voltage of 0.64 (0.58) V, a short-circuit current of 17.13 (16.89) mA/cm2, a fill factor (FF) of 77.55 (74.29)%, and an efficiency of 8.57 (7.31)%. Sb incorporation in InGaAsN adversely affects solar cell performance due to a reduced minority carrier lifetime correlated with the formation of defects and narrow depletion region width resulting from a higher background carbon impurity level.</P>
고속도로 엇갈림구간의 효율적 운영을 위한 구간길이 설계기준 적정성 평가
김태완(KIM, Taewan),이승준(LEE, Seungjun),김덕녕(KIM, Ducknyung),임찬수(REEM, Chansu),김영준(KIM, Youngjun),이은탁(LEE, Euntak),손봉수(SON, Bongsoo) 대한교통학회 2021 대한교통학회지 Vol.39 No.1
고속도로 엇갈림구간은 잦은 차로변경으로 인해 통행속도가 급격하게 저하함에 따라 교통혼잡이 발생하며 교통사고 발생 가능성이 있는 구간이다. 이에 엇갈림구간은 정체와 사고를 줄일 수 있도록 설계단계부터 면밀한 검토가 필요하나 국내에는 엇갈림구간 설계기준이 아직 미비한 상태이다. 엇갈림구간 설계에서 가장 중요한 것은 엇갈림구간의 길이로서, 적정한 길이 산정은 주로 한국도로용량편람(Korea highway capacity manual, KHCM)의 엇갈림구간 밀도산정식을 활용하고 있으나 이 산정식의 적정성에 대하여는 아직 명확히 밝혀진 바가 없다. 본 연구에서는 전국의 54개 고속도로 엇갈림구간을 6개 유형으로 분류하고, KHCM 밀도산정식의 적정성을 현장관측자료로 평가한 후 미시교통시뮬레이션 프로그램을 활용한 시나리오 분석을 진행하여 엇갈림구간 길이의 설계기준에 대한 적정성을 평가하였다. 분석결과, KHCM과 미시 시뮬레이션의 결과 값은 많은 차이를 보였는데 그 이유는 KHCM의 밀도식이 차량의 급가감속 등 불규칙적인 통행행태를 제대로 반영하지 못하기 때문인 것으로 추정된다. 석수IC 엇갈림구간 유형에 대한 VISSIM 분석결과, 구간길이가 250m 이하이면 교통량에 따라 서비스수준이 매우 민감하게 변화하여 교통운영과 안전 측면에서 매우 불안정한 교통류가 발생하는 것으로 분석되었다. 구간길이가 550m 이상인 경우 엇갈림 구간의 서비스수준은 거의 변화하지 않는 것을 확인하였으며, 이는 구간길이를 최대 750m로 제시하는 KHCM의 설계 길이 범위에 대해 고찰할 필요가 있음을 시사하고 있다. 본 연구의 결과는 향후 KHCM 밀도식의 개정의 필요성을 제시하고 있으며, 이를 위해서는 보다 많은 현장관측자료와 이를 설명할 수 있는 이론의 개발이 요구된다. On freeway weaving sections, traffic congestion and accidents occur frequently due to the disturbance generated by lane-changing vehicles. In order to reduce the disturbance, weaving section should be sufficiently long. The relationship between weaving length and density, or equivalent level of service, is suggested in Korea Highway Capacity Manual (KHCM). However, it is not fully demonstrated whether the suggested relationship is appropriate or not. The purpose of this paper is to investigate the appropriateness of KHCM standard compared with field data and micro-simulation results. The analysis results show that the density or level of service estimated by KHCM and micro-simulation are significantly different. This implies that KHCM has employed a single equation in order to estimate the densities of many different types of weaving sections, so it is not enough to represent vehicular behaviors somewhat complicated occurring on weaving sections. It, consequently, is suggested that KHCM standard for freeway weaving length should be carefully reassessed by using the data obtained from the field.
김태완(Taewan Kim),전용주(Yongjoo Jeon),김도경(Dokyung Kim),김상원(Sangwon Kim) 동아시아국제정치학회 2010 국제정치연구 Vol.13 No.1
It is the neoliberal conventional wisdom that international regimes facilitate cooperation among states. If that is true, the UNCLOS may help to ease the conflictive legacy in Northeast Asia. However, the conflict among three major countries, China, Japan, and Korea, seems to come up to the surface despite their participation of the UNCLOS. The three states have failed to delimitate the EEZ borders respectively for more than one decade since their ratification of the regime. This research adopts Haas and Speth"s four stages of regime evolution. The ocean conflict in Northeast Asia may fit in the fourth stage: The stage of implementation, monitoring, assessment and strengthening. If the conflicts among states occur in the process of application of the UNCLOS to the region, our suggestions in this research may effectively serve cooperation while reducing conflicts in Northeast Asia. That is, a potential regional maritime regime in Northeast Asia needs more compulsory regulations. Since there is no leadership in the region to initiate such a regime that might infringe on their national sovereignty, it is necessary for countries to make long-term efforts. First of all, including bilateral fishery agreement, international regimes in the region should be more sophisticated and ultimately developed into a general multilateral ocean management body. Diverse non-governmental efforts of groups and specialists, and transnational networks would function on the way of the maritime cooperation in the region.
김태완 ( Kim Taewan ),김인태 ( Kim In-tae ),신창희 ( Shin Chang-hee ),김용배 ( Kim Yong-bae ) 한국구조물진단유지관리공학회 2019 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.23 No.2
화재시 콘크리트 구조물의 노출 온도를 판단하여 화재 피해 범위를 신속하게 판단할 수 있는 무기질 변온색소를 포함한 시멘트의 개발을 목적으로 한다. 400℃의 온도에 노출된 콘크리트는 물리·화학적 변화에 의해 내구성과 내하력이 감소한다. 따라서 400℃ 온도에 노출 유무를 확인하기 위해 400℃의 온도에서 보라색에서 흰색으로 변하는 망간바이롤렛 변온색소를 사용하여 무기질 시멘트를 제조하였다. 제조된 시멘트는 400℃에서 색상의 변화와 함께 30분과 60분 이상의 노출시간도 판단할 수 있는 특징을 나타내었다.