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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>
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.
Staphylectomy using CO₂ laser for the treatment of nasopharyngeal stenosis in a cat
Ingeun Kim,Jong Baek Kim,Taewan Kim,Donghyeok Yoo,Eunchae Yoon,Daeun Kim,Ji Hyun Park,Yoonho Roh,Dongbin Lee 한국예방수의학회 2023 예방수의학회지 Vol.47 No.4
Nasopharyngeal stenosis is defined as a morphological transition of narrowing at the nasopharyngeal region. A 2-yearold, castrated male, Korean short hair cat was referred to the animal medical center, Gyeongsang National University. According to clinical signs, diagnostic imaging, and physical examination, nasopharyngeal stenosis was diagnosed. The staphylectomy was performed using a CO2 laser, and there were not any post-operative complications. The patient was discharged in two days. This report describes the case of nasopharyngeal stenosis in cat and represents that laser ablation could be a good option for surgical management of the nasopharyngeal region with a low complication rate.
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.