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주민진,이춘석,류남형 한국조경학회 2004 韓國造景學會誌 Vol.32 No.3
Focusing on WBGT(Wet Bulb Globe Thermometer Index) according to the LAI(Leaf Area Index) variation of trees, this study verifies the effects of urban shade trees on the outdoor thermal environment. As for methodology, air$.$globe temperature, air humidity and WBGT were measured under three shade trees whose LAIs were 2.1, 4.0 and 8.2 respectively at midday(12:00-13:00) of 14 sunny days from the 4th through the 29th day of September 2003. Those factors were also measured at the unshaded areas and compared with the values of shaded areas. The measured site was paved with interlocking concrete bricks. The measurements were analyzed through the ANCOV A(Analysis of Covariance) and the regression routines of SPSS11 for windows (SPSS Inc., 2001). The major findings were as follows. 1. The direct correlation between WBGT and LAI was very low. On the contrary, the WBGT showed close correlation with air$.$globe temperature and air humidity, and the LAI also showed very close correlation with globe temperature. These results tell that dominant shading effect by the tree is on the screening of direct solar radiation which lower the globe temperature and WBGT consequently. 2. While the average globe temperatures and WBGT at unshadowed area were 40.4$^{\circ}C$ and 26.2$^{\circ}C$ respectively, the former under the shade tree with LAI 2.1, 4.0 and 8.2 were 34.5$^{\circ}C$, 32.6$^{\circ}C$ and 30.2$^{\circ}C$, and the latter were 24.6$^{\circ}C$, 24$^{\circ}C$ and 23.4$^{\circ}C$ respectively. 3. The relationship between LAI(x) and WBGT(y) can be presented with the following equation: y = 24.23+1.53 $e^{-x}$+0.36x $e^{-x}$+0.46 $x^2$ $e^{-x}$ ($R^2$ =.98) =.98)
치과용 임플란트의 다양한 디자인 변수에 따른 응력분산의 3 차원 유한요소법적 분석
주민진(Min Jin Joo),전흥재(Heoung-Jae Chun),한종현(Chong Hyun Han) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
In this study, the comparison among the calculated stresses on fixtures and their surrounding bones for different implant lengths, diameters, types and thread shapes prior to and after the phase of osseointegration was conducted. A three dimensional finite element analysis was used to determine stresses generated in the bones with the different implant design factors. The FE models, including two designs (tapered, straight types), various dimensions (lengths: 8.5㎜, 10㎜ and 11.5㎜ and diameters: 4.3㎜ and 5.3㎜) and thread shapes (Trapezoid, Ⅴ, Square, Reverse buttress, Buttress shapes) with perfectly bonding (delayed loading) and frictional contact (immediate loading) at the implant-bone interfaces, were analyzed. The results of this study showed that increasing implant length and diameter result in stress reductions on the bone during delayed loading as well as immediate loading. However, after the length of implant has increased more than a critical length, the excessive stress may generate to the bone for immediate loading. The straight implant showed higher stress levels than tapered implant because of larger surface area. Square threads are more effective than other threads.
다양한 설계변수를 고려한 치과용 임플란트의 즉시하중과 지연하중의 비교연구
주민진(Min Jin Joo),전흥재(Heoung-Jae Chun),한종현(Chong Hyun Han) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
In this study, the comparison among the calculated stresses on fixtures and their surrounding bones for different implant lengths, diameters and type prior to and after the phase of osseointegration was conducted. A three dimensional finite element analysis was used to determine stresses generated in the bones with the different implant design factors. Twelve FE models, including two designs (tapered, straight) and various dimensions (lengths: 8.5㎜, 10㎜, 11.5㎜, diameters: 4.3㎜, 5.3㎜), with perfectly bonding (delayed loading) and frictional contact (immediate loading) of implant-bone interfaces, were analyzed. The results of this study showed that increasing implant length and diameter result in stress reductions on the bone during delayed loading as well as immediate loading. However, after the length of implant has increased more than a critical length, the excessive stress may generate to the bone for immediate loading. The straight implant showed higher stress levels than tapered implant because of larger surface.
바이오리액터 개발과 기계적 자극에 의한 중간엽 줄기세포의 영향에 관한 연구
주민진(Min Jin Joo),전흥재(Heoung-Jae Chun),정형진(Hyung Jin Jung),이창근(Chang Gun Lee),허동녕(Dong Nyoung Heo),권일근(Il Keun Kwon),문성환(Seong Hwan Moon) 대한기계학회 2010 大韓機械學會論文集A Vol.34 No.6
중간엽 줄기세포(MSCs)는 미분화 상태의 세포로써, 섬유아세포, 연골아세포, 골아세포 등으로 분화하여 인체의 근골격계를 구성하며, 기계적 자극은 중간엽 줄기세포 분화를 결정하는 중요한 인자로 알려져 이다. 본 연구에서는, 세포가 생존하기 위한 환경을 제공하고, 세포가 기계적 자극조건에 따라 분화할 수 있도록 하는 바이오리엑터를 제안하엿다. 또한, 중간엽 줄기세포를 배양하기 위한 세포 지지체로써 PU(polyurethane)로 제작된 지지체를 제안하였다. 세포 분화를 확인하기 위하여, 중간엽 줄기세포를 PU 지지체에 seeding한 후, 바이오리엑터를 이용하여 기계적 자극에 의한 세포의 분화를 확인하였다. It is well known that mesenchymal stem cell(MSCs) can be differentiated into fibroblasts, chondrocytes, and osteoblasts and that they develop into fibrous tissue, cartilage, or bone, as a result of mechanical stimulation. In this study, we developed a bioreactor system, which is composed of a reactor vessel that provides the required cell culture environment, an environment controlling chamber to control the media, a gas mixer, and a reactor motion control subsystem to apply mechanical stimuli to the cells. For the MSC culture, We used a poly-urethane (PU) scaffold, with a collagen coating to ensure improved cohesion ratio. Then, we transferred the cultivated MSCs in the PU scaffold, cultured the cells in the bioreactor system, and confirmed the proliferation, differentiation, and ossification processes, resulting from mechanical stimuli.
김도태,김동수,주민진,Kim, Do-Tae,Kim, Dong-Soo,Ju, Min-Jin 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.1
Of all of pneumatic components utilized in the make up of pneumatic circuits on either automatic assembly machine or industrial equipment, the pneumatic cylinder is more oriented toward being a structural as well as a pneumatic member. The structural design must be based to a large degree on the end of application of the cylinder on the equipment it is operating. In this paper, design studies of a double-acting pneumatic cushion type cylinder with low-friction and high-speed driving have been developed. Of interest here is to investigate the stress and strain analysis of cylinder tube, piston rod, end cover, and to analyze the buckling of piston rod. A finite element analysis is carried out to compute the distribution of the displacement, stress and safety factors by using ANSYS. As a result, the structural safety factors of each parts in pneumatic cushion cylinder are evaluated and confirmed at the design specifications.
전용식(Y. S. Jeon),주민진(M. J. Ju),오영철(Y. C. Oh),김동수(D. S. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.11
The technology of ISO Solenoid Valves is now considered as a core technology in the fields of the production line of semi-conductor chips and the ISO fluid chips for medical applications. And ISO Solenoid Valves, which operate by compressed air, are characterized by high speed response, great repeatability and that the pressure on the cross sectional area of poppet is kept constant regardless of the fluctuation of the pressure exerted on the ports. The primary objective of this study is to compare the optimally designed Solenoid Valve with the actually produced one and to design a power saving circuit which can highly improve the efficiency by providing optimal current according to mechanical load.
전용식(Y. S. Jeon),주민진(M. J. Ju),오영철(Y. C. Oh),김동수(D. S. Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
The technology of ISO Solenoid Valves is now considered as a core technology in the fields of the production line of semi-conductor chips and the ISO fluid chips for medical applications. And ISO Solenoid Valves, which operate by compressed air, are characterized by high speed response, great repeatability and that the pressure on the cross sectional area of poppet is kept constant regardless of the fluctuation of the pressure exerted on the ports. The primary objective of this study is to compare the optimally designed Solenoid Valve with the actually produced one and to design a power saving circuit which can highly improve the efficiency by providing optimal current according to mechanical load.