http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김범준,박수영,최동훈,Kim, Beom Jun,Park, Su Yeong,Choe, Dong Hun Korean Chemical Society 2001 Bulletin of the Korean Chemical Society Vol.22 No.3
We investigated H-type molecular aggregation in a simply spin-coated amorphous homopolymer film of polymethacrylate containing push-pull azobenzene moieties. It was found that the aggregate formation was strongly influenced by thermal treatment an d that the aggregate created in the polymer film could be easily disrupted by irradiation of a linearly polarized light. In the first writing cycle of aggregated polymer film, photo-induced birefringence showed a steep increase to the highest value followed by a gradual decrease to the certain asymptotic value under longer irradiation of a linearly polarized light. This unique behavior could be attributed to the cooperative motion and the disruption of the aggregated molecules under continuous irradiation of light.
Spin-coating법에 의한 $TiO_2$의 광촉매 효율
김범준,변동진,이중기,박달근,Kim, Beom-Jun,Byeon, Dong-Jin,Lee, Jung-Gi,Park, Dal-Geun 한국재료학회 2000 한국재료학회지 Vol.10 No.4
TiO$_2$thin films were prepared on the glass by a conventional spin coating method with $TiO_2$ sol(30wt%, anatase). The thickness of the thin films were controlled by the number of coating cycles: one cycle is composed of spin coating, drying, and heating process. The reaction rate of the film was obtained by the photodecomposition of gaseous benzene under 0.44 and 2.0mW/$\textrm{cm}^2$ UV light on the film surface. For an incident UV light intensity of 0.44mW/$\textrm{cm}^2$, the reaction rate was increased with the thickness of the film, caused by extent of surface area, but there was no change over the thickness of about 4$\mu\textrm{m}$. The porous $TiO_2$ thin film has comparatively vast effective surface area, which under relatively high-intensity UV illumination causes the reaction rate to be controlled by the film thickness. $TiO_2$sol(30wt%, anatase)을 이용하여 스핀코팅으로 유리기판에 $TiO_2$박막을 제조하였다. 박막의 두께는 코팅주기의 횟수가 조절하였다. 한 코팅주기는 스핀코팅, 건조, 열처리를 포함한다. 박막의 반응성은 막 위에서의 자외선강도가 0.44와 2.mW/$\textrm{cm}^2$인 조건에서 벤젠기체의 광분해 속도를 통해 조사하였다. 박막의 두께가 증가할수록 표면적으로 증가로 인해 반응성은 증가하였으며, 0.44mW/$\textrm{cm}^2$일 때 4$\mu\textrm{m}$정도 이상의 두께에서 반응성은 더 이상 증가되지 않았다. porous한 $TiO_2$박막은 비교적 넓은 유효표면적을 가지고 있으며, 그것은 비교적 높은 자외선 강도하에서 박막두께에 따라 반응속도를 증가시키는 결과를 낳았다.
주행조건에서의 자동차 모델 항력에 대한 수치해석적 연구
김범준,강성우,최형권,유정열,Kim, Beom-Jun,Kang, Sung-Woo,Choi, Hyoung-gwon,Yoo, Jung-Yul 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.8
A parallelized FEM code based on domain decomposition method has been recently developed for large-scale computational fluid dynamics. A 4-step splitting finite element algorithm is adopted for unsteady flow computation of the incompressible Navier-Stokes equation, and Smagorinsky LES model is chosen for turbulent flow computation. Both METIS and MPI Libraries are used for domain partitioning and data communication between processors, respectively. Tiburon model of Hyundai Motor Company is chosen as the computational model at Re=7.5 $\times$ 10$^{5}$ , which is based on the car height. The calculation is carried out under both the wind tunnel condition and the road condition using IBM SP parallel architecture at KISTI Super Computing Center. Compared with the existing experimental data, both the velocity and pressure fields are predicted reasonably well and the drag coefficient is in good agreement. Furthermore, it is confirmed that the drag under the road condition is smaller than that under the wind-tunnel condition.
3$\times$1패턴에 의한 3차원 브레이드의 기하학적 모델
김범준,이재곤,강태진,Kim, Beom-Jun,Lee, Jae-Gon,Gang, Tae-Jin 한국섬유공학회 1989 한국섬유공학회지 Vol.26 No.2
The micromechanics of 3-D braided preform by 3 $\times$1 pattern has been analyzed Based on the actual yarn paths and interlacing patterns, geometric relations between the structural parameters are analytically established. Analysis of the yarn paths during one repeat of the preform gives the number of different groups of the yarn with the same pattern in the structure which will in turn decide the yarn types used in the formation of hybrid composites where several different types of yarns are used. Observation of the preform surface cut at an angle of 18$^{\circ}$gives the interlacing pattern of the yarns and the critical condition of jamming in all directions has been determined with the critical orientation angle of 54$^{\circ}$which is smaller than that 1 $\times$1 pattern preform which is calculated as 60$^{\circ}$. This difference in critical orientation angle will result in difference in physical properties of the composites. The maximum yarn volume fraction was determind to be 63.4% which is smaller than 78.5% of 1 $\times$1 pattern preform. The validity of the analytical model was examined by testing the preforms braided with several different high performance fibers.
김범준(Beom-Jun Kim),김인기(Inki Kim),임현석(Hyunseok Lim),곽정환(Jeonghwan Gwak) 한국컴퓨터정보학회 2021 한국컴퓨터정보학회 학술발표논문집 Vol.29 No.2
본 논문에서는 목조건물의 Crack만을 움직여 Data set을 증강하는 기법을 제안한다. 이 기법은 이미지 내 Crack Detection의 학습 데이터를 만들기 위해 이미지의 전체적인 값으로 Flip, Rotation, Shift, Rescale 등의 변환을 통해 Data Augmentation을 진행하는 대신 Crack이라는 하나의 Object만을 가지고 새로운 데이터를 생성한다. 이때 Object는 관심 영역 내에서만 연산되어 기존의 방법보다 더욱 많은 데이터를 얻을 수 있으며, Crack이 관심 영역 밖으로 이동하지 않기 때문에 이상치 혹은 결측치가 존재하지 않는 데이터를 얻을 수 있다. 또한 Crack이 존재하지 않는 이미지에도 임의적으로 Crack을 생성하여 새로운 데이터를 만들 수 있다. 결론적으로 본 논문에서는 Crack Detection의 학습을 위하여 기존 방법보다 우수한 성능의 Data Augmentation을 제안하였다.