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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.
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.
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.
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.
대학 스포츠 동아리 참여동기와 심리적 행복감의 관계에서 스포츠 몰입의 매개효과 검증
김범준(Kim, Beom-Jun),이재무(Lee, Jea-Moo) 한국사회체육학회 2018 한국사회체육학회지 Vol.0 No.73
The study aims to investigate factors influencing participation motivation, sport commitment and psychological happiness, as well as the mediating effect of sport commitment. Total 401 participants were included in the analyses after excluding 3 participants who did not answer the questionnaires. According to the results, first, intrinsic motivation, extrinsic motivation, and a motivation predicted cognitive commitment and behavioral commitment. Second, intrinsic motivation and extrinsic motivation were significantly associated with psychological happiness. Intrinsic motivation, extrinsic motivation, and amotivation were significantly associated with psychological happiness. Third, sport commitment mediated the relationship between participation motivation and psychological happiness. In addition, sport commitment mediated the relationship between participation motivation and psychological happiness, which in turn indicated the important role of sport commitment. Further, this study suggests that sport development and information may motivate the sport participation of university students and enable to help feel psychological happiness, which might help improving university life and quality of life.