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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.
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>
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>
Customer journey map의 한계 및 개선방안에 대한 연구 : 실제 요식업체 매장 중심으로
김태완(Taewan Kim),김경윤(Kyungyoon Kim),김하나(Hana Kim),최은섭(Eunsub Choi),이정연(Jeongyoun Lee) 한국HCI학회 2012 한국HCI학회 학술대회 Vol.2012 No.1
학교 수업의 일환으로 서비스디자인을 진행하였는데, 대상은 갓 오픈한 요식업체 매장이다. 이 매장은 점심시간에 식사를 판매하고 저녁시간에는 술을 판매하는, 인근의 요식업체 매장과는 다른 형태인데 점심시간의 매출이 업주 생각보다 높지 않아 고민하고 있는 상태였기에, 우리는 매출 증대를 위해 서비스디자인을 제안하였고 초기 문제발견 단계부터 시작하였다. interview와 Persona를 통한 customer journey map의 작성과 context mapping을 진행하던 중, customer journey map에서 도출된 pain point들이 최종적으로 해당 매장을 찾는 여부와는 관련성이 약한 점을 발견하게 되었다. 따라서 이 논문에서는 customer journey map의 touch point들 중, 고객들이 중요하게 생각하는 부분을 찾아 가중치를 부여하는 보완된 customer journey map을 제안한다. 이를 통해 서비스디자인 실행 단계에서 고객이 중요시하는 서비스에 집중하여 시간, 비용적인 자원의 감소와 의뢰 업체에 최적의 제안을 하는데 기여할 수 있을 것이다. As a part of schoolwork make progress service design then that was just opening restaurant department. The department was selling a meal in lunch, and alcoholic in evening that the store is different forms of others. But business owners worried about lower sales. So we proposed to make progress service design for increase sales, then started from beginning problem detection stage. Through interview and persona draw up for customer journey map after making progressing of context mapping then, drawing from customer journey map found out pain point that is weak of connection point for search the said store lastly. Consequently about this paper said that among touch point of customer journey map, that propose searching customer regarding significantly compensate the customer journey map. Through the way, focus on the customer attach great importance to service at practice stage, in the end we contributed to suggest for decrease of resource costly and optimum propose to business of request.
초임계 유체를 이용한 고성능 나노에너지 물질 제조 및 고분자 복합체 제조
김태완(Taewan Kim),서범준(Bumjoon Seo),김자영(Ja Young Kim),이근득(Keun Deuk Lee),김진석(Jin Seok Kim),이윤우(Youn-Woo Lee) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
본 연구의 목표는 초임계 용매 공정을 이용해 기존의 고폭화약 RDX 입자를 미세화 시킴과 동시에 고분자를 공침하여 덜 위험한 화약을 제조하는 것이다. RDX는 가장 널리 사용되는 고폭화약의 한 종류로 기존 재래식 폭약인 TNT보다 높은 폭발성능을 지니지만 충격에 민감하여 원치 않는 폭발이 일어날 가능성이 크다. 따라서 RDX의 민감도를 낮춰 안정성을 올리는 것은 필수적이다. 화약은 일반적으로 입자크기가 작아짐에 따라 둔감해지는 경향성을 가진다. 입자를 미세화 하는 방법은 크게 top-down, bottom-up 접근이 있다. 본 연구에서는 bottom-up 접근을 통해 입자를 재결정화 시키고 또한 추가적인 고분자를 주입하여 고분자가 공침된 입자를 제조하였다. 공침된 입자는 FE-SEM을 통해 그 형태와 대략적인 입도를 확인하였고, FT-IR, XRD 분석을 통해 입자의 성질을 파악하였다. 또한 내부에 포함된 고분자의 함량을 알기 위하여 열 원소 분석을 시행하였다. Explosives are compounds or mixtures which produce hot compressed gas reacted by impact or electrical shock. To reduce sensitivity of explosive materials, we focused on reducing internal defects in explosives. Research Department eXplosive(RDX) is high energetic material which is more powerful than TNT, most general explosive. To decrease sensitivity of RDX, we micronized the RDX particle by a precipitation process. When RDX particle gets smaller, sensitivity also gets lower, because small particle can decrease the size and number of hotspots. We used Rapid Expansion of Supercritical Solvent process called RESS. We analyzed the sample with elemental analysis, FE-SEM, XRD, FT-IR.
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.