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Basic phenotyping platform for genetically engineered mouse at KRIBB
Hae Rim Kim,Eun Kyoung Kim,Yong Sub Byun,Kang Ju Seong,Ju Young Lee,Yu Rim Kim,Min Young Lee,Sang Mi Cho,Taek Chang Lee,Hae Jin Lee,Young Ho Kho,Ok Seong Moon,Young Won Seo,Ki Hoon Lee,Hoyoung Ghang,W 한국실험동물학회 2015 한국실험동물학회 학술발표대회 논문집 Vol.2015 No.8
풍력발전기용 Yaw Gearbox의 가속 수명시험에 관한 연구
이용범(Yong-Bum Lee),이기천(G. C. Lee),이종직(J. J. Lee),임신열(S. Y. Lim),김우진(W. J. Kim),김광민(K. M. Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The yaw gear box of a wind power generator is a key device that rotates several hundred tons (200 to 600 tons) of nacelle so that the blade is 90 degrees in the direction of wind to improve power generation efficiency. Recently, in order to increase the economic efficiency of wind power generators and utilize excellent wind resources, the installation site is expanding from land to sea as it has become super-large to 8-12MW. The target life of large wind power generators requires more than 25 to 30 years. The yaw gearbox is installed in 6 to 12 parallels in very complex places above the tower and below the nacelle, and if a failure occurs after installation, it is important to ensure reliability of the yaw gearbox because it costs tens to hundreds of times the price of a new product as well as economic damage. In order to secure the reliability of the gear box, the equivalent load was calculated by analyzing the failure mode analysis and the Filed data, and the accelerated life test condition was established, and the test device was constructed to analyze the performance degradation.
AN ANALYSIS OF INFRARED IMAGES OF JUPITER IMPACTED BY P/SHOEMAKER-LEVY 9
KIM YONG HA,SUNG KIYUN,KIM SANG JOON,COCHRAN W. D.,LESTER D. F.,TRAFTON L.,CLARK B. E. The Korean Astronomical Society 1996 Journal of The Korean Astronomical Society Vol.29 No.2
We have analyzed infrared (IR) images of Jupiter which was observed at the McDonald Observatory, Texas, U.S.A., during the P/SHoemaker-LEvy 9 (SL9) impact period and about one week after the last impact. The IR images were obtained on the 2.7m telescope using a NICMOS array with filters to isolate the $1.5{\mu}m\;NH_3\; band,\;the\;2.3{\mu}m\;CH_4\;band,\;the\;2.12{\mu}m\;H_2\;S(0)$ pressure-induced absorption, and the continua at $1.58{\mu}m\;and\;2.0{\mu}m$ (short K-band). All images except those with the $1.58{\mu}m$ continuum filter show bright impact sites against the relatively dark Jovian disk near the impact latitude of about $45^{\circ}$ S. This implies that dusts originated from the impacts reflect the solar radiation at high altitudes before absorbed by stratospheric $CH_4,\;NH_3 \;or\;H_2$. The impact sites observed with the $2.3{\mu}m$ filter are conspicuously bright against a very dark background. The morphology of impact sites, G, L, and H at 2.3 and $2.12{\mu}m$ filters shows clearly an asymmetric structure toward the incident direction of the comet fragments, in agreement with the studies of visible impact images obtained with the Hubble Space Telescope. Comparisons of reflectances of G, L, and H sites with simple radiative transfer models suggest that optically thick dust layers were formed at high altitudes at which methane absorption attenuates incoming sunlight only by about $1\%$. The dust layers in these sites seem to form at about the same altitude regardless of the magnitude of the impacts, but they appear to descend gradually after the impacts. The dust layers have optical depths of 2-5, according to the models.
K. -S. Park,C. -W. Oh,T. -W. Kim,Hyun-Yong Jeong,Y.-H. Kim 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.9
An improved friction model was proposed with consideration of the effect of the sliding speed, the contact pressure and the temperature, and it was implemented into a user subroutine of a commercial FEM code, ABAQUS/Explicit. Then, a smooth tire was simulated for free rolling, driving, braking and cornering situations using the improved friction model and the Coulomb friction model, and the effect of the friction models on the slip, the frictional energy distribution and the cornering force and moment was analyzed. For the free rolling, the driving and the braking situations, the improved friction model and the Coulomb friction model resulted in similar profiles of the slip and the frictional energy distributions although the magnitudes were different. The slips obtained from the simulations were in a good correlation with experimental data. For the cornering situation, the Coulomb friction model with the coefficient of friction of 1 or 2 resulted in lower or higher cornering forces and moments than experimental data. In addition, in contrast to experimental data it did not result in a maximum cornering force and a decrease of the cornering moment for the increase of the speed. However, the improved friction model resulted in similar cornering forces and moments to experimental data, and it resulted in a maximum cornering force and a decrease of the cornering moment for the increase of the speed, showing a good correlation with experimental data.
풍력발전기용 Yaw Gearbox의 가속 수명시험에 관한 연구
이용범(Yong-Bum Lee),이기천(G. C. Lee),이종직(J. J. Lee),임신열(S. Y. Lim),김우진(W. J. Kim),김광민(K. M. Kim) 대한기계학회 2022 대한기계학회 춘추학술대회 Vol.2022 No.11
The yaw gear box of a wind power generator is a key device that rotates several hundred tons (200 to 600 tons) of nacelle so that the blade is 90 degrees in the direction of wind to improve power generation efficiency. Recently, in order to increase the economic efficiency of wind power generators and utilize excellent wind resources, the installation site is expanding from land to sea as it has become super-large to 8-12MW. The target life of large wind power generators requires more than 25 to 30 years. The yaw gearbox is installed in 6 to 12 parallels in very complex places above the tower and below the nacelle, and if a failure occurs after installation, it is important to ensure reliability of the yaw gearbox because it costs tens to hundreds of times the price of a new product as well as economic damage. In order to secure the reliability of the gear box, the equivalent load was calculated by analyzing the failure mode analysis and the Filed data, and the accelerated life test condition was established, and the test device was constructed to analyze the performance degradation.
U. Yong(용의중),D. Kim(김동환),H. Kim(김호중),D. G. Hwang(황동규),S. Cho(조성건),H. Nam(남효영),S. Kim(김세진),T. Y. Kim(김태영),U. Jeong(정운룡),K. Kim(김기훈),W. K. Chung(정완균),W. H. Yeo(여운홍),J. Jang(장진아) Korean Society for Precision Engineering 2021 한국정밀공학회 학술발표대회 논문집 Vol.2021 No.11월
Over the years, engineered heart tissue (EHT), composed of cardiac cells and a hydrogel, has been considered as a promising in-vitro cardiac model in that it can reproduce the physiological contractions of an actual animal heart. In particular, the contractile force of EHT is one of the representative factors to evaluate drug-induced cardiotoxicity that is a major cause of the withdrawal of drug development. Although there have been a lot of methods to monitor the contractile force of the EHT, most of them are based on optical readout systems that have to process a huge amount of image data. Recently, a strain gauge-based microphysiological system was developed to monitor the contractile force of a laminar cardiac tissue, which can acquire real-time data with a relatively small amount of data. However, the system can monitor only few layers of cardiomyocytes, which are physiologically less relevant environment compared to EHT. Here, we developed a hybrid bioprinted tissue platform, consisting of six bipillar-grafted strain gauges (BPSGs) and one wireless device, that enables online monitoring of the contractile forces from 6 different EHTs in real time during culturing. Furthermore, we confirmed that our system can detect the effects of commercially available drugs on EHTs.
Development and Characterization of New Animal Model for Alzheimer`s Disease
( Dae Y. Hwang ),( Yong Kyu Kim ),( Chuel Kyu Kim ),( Bung Guk Kim ),( Sun B. Shim ),( Seung W. Jee ),( Su H. Lee ),( Ji Soon Sin ),( Chang Jun Bae ),( Byoung Chun Lee ),( Su Jin Seo ),( Jung Sik Cho 한국응용약물학회 2007 학술대회 Vol.2007 No.1