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고한서,허신 漢陽大學校 工學技術硏究所 1997 工學技術論文集 Vol.6 No.1
In distributed real-time systems, IPC needs to deal with node change on dynamic network efficiently and design the processes for designer transparently For this IPC faculty, HU-DF(Data Field) is currently been studing in embedded real-time systems. The purpose of HU DF is to support the IPC faculty to DREAM(Distributed Real-Time Ever Available Micro-computing) kernel. The weakness of HU-DF is physical broadcasting, which causes the network bottleneck on HU-DF. It has the state message buffer in OCT(Outgoing Communication Thread). Thus, we can reduce the number of message transported to ICT(Incoming Communication Thread).
A Study on the Development of Measurement Techniques for Thermal Flows in MEMS
Ko Han-Seo,Yang Sang-Sik,Yoo Jai-Suk,Kim Hyun-Jung The Korean Institute of Electrical Engineers 2006 Journal of Electrical Engineering & Technology Vol.1 No.3
A review on advanced flow visualization techniques is presented particularly for applications to micro scale heat and mass transport measurements. Challenges, development and applications of micro scale visualization techniques are discussed for the study of heating/evaporating thin films, a heated micro channel, and a thermopneumatic micro pump. The developed methods are (1) Molecular Tagging Fluorescence Velocimetry (MTFV) using 10-nm caged seeding molecules (2) Micro Particle Velocimetry (MPIV) and (3) Ratiometric Laser Induced Fluorescence (LIF) for micro-resolution thermometry. These three methods are totally non-intrusive techniques and would be useful to investigate the temperature and flow characteristics in MEMS. Each of these techniques is discussed in three-fold: (1) its operating principle and operation, (2) its application and measurement results, and (3) its future challenges.
A Study on the Development of Measurement Techniques for Thermal Flows in MEMS
Han-Seo Ko,Sang-Sik Yang,Jai-Suk Yoo,Hyun-Jung Kim 대한전기학회 2006 Journal of Electrical Engineering & Technology Vol.1 No.3
A review on advanced flow visualization techniques is presented particularly for applications to micro scale heat and mass transport measurements. Challenges, development and applications of micro scale visualization techniques are discussed for the study of heating/evaporating thin films, a heated micro channel, and a thermopneumatic micro pump. The developed methods are (1) Molecular Tagging Fluorescence Velocimetry (MTFV) using IO-nm caged seeding molecules (2) Micro Particle Velocimetry (MPIV) and (3) Ratiometric Laser Induced Fluorescence (LIF) for micro-resolution thermometry. These three methods are totally non-intrusive techniques and would be useful to investigate the temperature and flow characteristics in MEMS. Each of these techniques is discussed in three- fold: (1) its operating principle and operation, (2) its application and measurement results, and (3) its future challenges.
Han Seo Ko,Kwang-Hee Park,Yong-Jae Kim 대한기계학회 2004 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.18 No.7
Transient and asymmetric density distributions have been investigated by three-dimensional digital speckle tomography. Multiple CCD images captured movements of speckles in three angles of view simultaneously because the flows were asymmetric and transient. The speckle movements between no flow and downward butane flow from a circular half opening have been calculated by a cross-correlation tracking method so that those distances can be transferred to deflection angles of laser rays for density gradients. The three-dimensional density fields have been reconstructed from the deflection angles by a real-time multiplicative algebraic reconstruction technique (MART).
Tomographic Reconstruction of Two-Phase Flows
Han Seo Ko,Yong-Jae Kim 대한기계학회 2003 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.17 No.4
Tomography has been investigated to observe bubble behaviors in two-phase flows. A bubbly flow and an annular flow have been reconstructed by tomography methods such as an algebraic reconstruction technique (ART) and a multiplicative algebraic reconstruction technique (MART). Computer synthesized phantom fields have been used to calculate asymmetric density distributions for limited cases of 3, 5, and 7 projection angles. As a result of comparison of two tomography methods, the MART method has shown a significant improvement in the reconstruction accuracy for analysis of the two-phase flows.
Seo, Jae-Keun,Ko, Ki-Han,Cho, Hyung-Jun,Choi, Won-Seok,Park, Mun-Gi,Seo, Kyung-Han,Park, Young,Lim, Dong-Gun The Korean Institute of Electrical and Electronic 2010 Transactions on Electrical and Electronic Material Vol.11 No.1
In this study, transparent and conductive Al-doped zinc oxide (AZO) films were prepared on a glass substrate by an radio frequency (RF) magnetron sputtering method using a 150-nm-thick AZO target (Al: 2 wt.%) at room temperature. We investigated the effects of RF power between 100-350 W (in steps of 50 W) on the structural, electrical, and optical properties of the AZO films. The thickness and cross-sectional images of the films were observed by field emission scanning electron microscopy. The thicknesses of all films were kept constant at 150 nm and grown on a glass substrate. The grain sizes of the AZO films were determined with the X-ray diffraction by using the Scherrer' equation, and their electrical properties were investigated using a Hall effect electronic transport measurement system. The transmittance of the AZO films was also measured by an ultraviolet-visible spectrometer.
Voluntary stand-up physical activity enhances endurance exercise capacity in rats
Seo, Dae Yun,Lee, Sung Ryul,Kwak, Hyo-Bum,Seo, Kyo Won,McGregor, Robin A,Yeo, Ji Young,Ko, Tae Hee,Bolorerdene, Saranhuu,Kim, Nari,Ko, Kyung Soo,Rhee, Byoung Doo,Han, Jin The Korean Society of Pharmacology 2016 The Korean Journal of Physiology & Pharmacology Vol.20 No.3
Involuntary physical activity induced by the avoidance of electrical shock leads to improved endurance exercise capacity in animals. However, it remains unknown whether voluntary stand-up physical activity (SPA) without forced simulating factors improves endurance exercise capacity in animals. We examined the effects of SPA on body weight, cardiac function, and endurance exercise capacity for 12 weeks. Twelve male Sprague-Dawley rats (aged 8 weeks, n=6 per group) were randomly assigned to a control group (CON) or a voluntary SPA group. The rats were induced to perform voluntary SPA (lifting a load equal to their body weight), while the food height (18.0 cm) in cages was increased progressively by 3.5 every 4 weeks until it reached 28.5 cm for 12 weeks. The SPA group showed a lower body weight compared to the CON group, but voluntary SPA did not affect the skeletal muscle and heart weights, food intake, and echocardiography results. Although the SPA group showed higher grip strength, running time, and distance compared to the CON group, the level of irisin, corticosterone, genetic expression of mitochondrial biogenesis, and nuclei numbers were not affected. These findings show that voluntary SPA without any forced stimuli in rats can effectively reduce body weight and enhance endurance exercise capacity, suggesting that it may be an important alternative strategy to enhance endurance exercise capacity.