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Park, Jinmo,Kim, Nakwan The Society of Naval Architects of Korea 2015 International Journal of Naval Architecture and Oc Vol.7 No.2
In this paper, we employ a dynamics modeling method for investigating a multi-body dynamics system of semi-submersible autonomous underwater vehicles consisting of a towing vehicle operated near the water surface, a tow cable, and a towfish. The towfish, which is towed by a marine cable for the purposes of exploration or mine hunting, is modeled with a Six-Degree-of-Freedom (6-DOF) equation of motion that reflects its hydrodynamics characteristics. The towing cable, which can experience large displacements and deformations, is modeled using an absolute nodal coordinate formulation. To reflect the hydrodynamic characteristics of the cable during motion, the hydrodynamic force due to added mass and the drag force are imposed. To verify the completeness of the modeling, a few simple numerical simulations were conducted, and the results confirm the physical plausibility of the model.
Dynamics modeling of a semi-submersible autonomous underwater vehicle with a towfish towed by cable
Jinmo Park,Nakwan Kim 대한조선학회 2015 International Journal of Naval Architecture and Oc Vol.7 No.2
In this paper, we employ a dynamics modeling method for investigating a multi-body dynamics system of semi-submersible autonomous underwater vehicles consisting of a towing vehicle operated near the water surface, a tow cable, and a towfish. The towfish, which is towed by a marine cable for the purposes of exploration or mine hunting, is modeled with a Six-Degree-of-Freedom (6-DOF) equation of motion that reflects its hydrodynamics characteristics. The towing cable, which can experience large displacements and deformations, is modeled using an absolute nodal coordinate formulation. To reflect the hydrodynamic characteristics of the cable during motion, the hydrodynamic force due to added mass and the drag force are imposed. To verify the completeness of the modeling, a few simple numerical simulations were conducted, and the results confirm the physical plausibility of the model.
Development of browning technology for Lentinus edodes in sawdust medium with LED
Jinmo Koo,Sung-Hak Lee,Eun-Hee Kim,Seo-Wan Park,Hyo-Chan Park,Woo-Sik Jo 한국버섯학회 2017 버섯 Vol.21 No.1
Shiitake culture in sawdust is a widely applied method, which can supplement the disadvantages of costly and time consuming oak log cultivation. In sawdust cultivation, browning of surface mycelia is an important stage for the productivity and longevity of sawdust media. Surface browning forms protection coat for the substrate, which can block the invasion of outer pathogens and suppress water evaporation in the substrate. We controlled different light source (red LED, white LED, blue LED, and fluorescent light) with different intensity of illumination (1.5, 10.5, 20.5 μmol/m2s for LEDs and 10, 100, 300 lux for fluorescent light) to induce browning. Lights were treated with 1 hour on/ 1 hour off cycle maintained in a controlled room with 20℃ temperature, 60% humidity, and 1200 ppm CO2 atmosphere concentration for 60 days. Browning effect differed from the source and intensity of illumination. Browning was most effective in 1.5 μmol/m2s for red and blue LED. All light sources showed less browning in highest intensity of illumination, which indicates that higher than 20.5 μmol/m2s for LEDs or 300 lux for fluorescent light are not effective. After harvesting fruit bodies, we measured their weight, length and width of pileus and stipe, chromaticity, and hardness. Treatment with 1.5 μmol/m2s blue LED produced the best harvest with highest average individual weight (21.2g), stipe length (30.8 mm), and hardness (377.9 g) with fine length and width of pileus, and chromaticity. This results indicate that 1.5 μmol/m2s blue LED showed the best browning effect which resulted in the best harvest yield.
Heterogeneous SRAM Cell Sizing for Low-Power H.264 Applications
Jinmo Kwon,Ik Joon Chang,Insoo Lee,Heemin Park,Jongsun Park IEEE 2012 IEEE transactions on circuits and systems. a publi Vol.59 No.10
<P>In low-voltage operation, static random-access memory (SRAM) bit-cells suffer from large failure probabilities with technology scaling. With the increasing failures, conventional SRAM memory is still designed without considering the importance differences found among the data stored in the SRAM bit-cells. This paper presents a heterogeneous SRAM sizing approach for the embedded memory of H.264 video processor, where the more important higher order data bits are stored in the relatively larger SRAM bit-cells and the less important bits are stored in the smaller ones. As a result, the failure probabilities significantly decrease for the SRAM cells storing the more important bits, which allows us to obtain the better video quality even in lower voltage operation. In order to find the SRAM bit-cell sizes that achieve the best video quality under SRAM area constraint, we propose a heterogeneous SRAM sizing algorithm based on a dynamic programming. Compared to the brute-force search, the proposed algorithm greatly reduces the computation time needed to select the SRAM bit-cell sizes of 8 bit pixel. Experimental results show that under iso-area condition, the heterogeneous SRAM array achieves significant PSNR improvements (average 4.49 dB at 900-mV operation) compared to the conventional one with identical cell sizing.</P>
Development of Browning Technology for Shiitake in Sawdust with LED
Jinmo Koo,Sung-Hak Lee,Seo-Wan Park,Hyo-Chan Park,Woo-Sik Jo 한국버섯학회 2017 버섯 Vol.21 No.2
Shiitake culture in sawdust is a widely applied method, which can supplement the disadvantages of costly and time consuming oak log cultivation. In sawdust cultivation, browning of surface mycelia is an important stage for the productivity and longevity of sawdust media. Surface browning forms protection coat for the substrate, which can block the invasion of outer pathogens and suppress water evaporation in the substrate. We controlled different light source (red LED, white LED, blue LED, and fluorescent light) with different intensity of illumination (1.5, 10.5, 20.5 μmol/m2s for LEDs and 10, 100, 300 lux for fluorescent light) to induce browning. Lights were treated with 1 hour on/ 1 hour off cycle maintained in a controlled room with 20oC temperature, 60% humidity, and 1200 ppm CO2 atmosphere concentration for 67 days. Browning effect differed from the source and intensity of illumination. Browning was most effective in 1.5 μmol/m2s for blue LED. All light sources showed less browning in highest intensity of illumination, which indicates that higher than 20.5 μmol/m2s for LEDs or 300 lux for fluorescent light are not effective. After harvesting fruit bodies, we measured their weight, length and width of pileus and stipe, chromaticity, and hardness. Treatment with 1.5 μmol/m2s blue LED produced the best harvest with highest average individual weight (21.2g), stipe length (30.8 mm), and hardness (377.9 g) with fine length and width of pileus, and chromaticity. This results indicate that 1.5 μmol/m2s blue LED showed the best browning effect which resulted in the best harvest yeild.
실시간 적응 A<SUP>*</SUP> 알고리즘과 기하학 프로그래밍을 이용한 선박 최적항로의 2단계 생성기법 연구
박진모(Jinmo Park),김낙완(Nakwan Kim) 한국해양공학회 2015 韓國海洋工學會誌 Vol.29 No.3
This paper proposes a new approach for solving the weather routing problem by dividing it into two phases with the goal of fuel saving. The problem is to decide two optimal variables: the heading angle and speed of the ship under several constraints. In the first phase, the optimal route is obtained using the Real-Time Adaptive A<SUP>*</SUP> algorithm with a fixed ship speed. In other words, only the heading angle is decided. The second phase is the speed scheduling phase. In this phase, the original problem, which is a nonlinear optimization problem, is converted into a geometric programming problem. By solving this geometric programming problem, which is a convex optimization problem, we can obtain an optimal speed scheduling solution very efficiently. A simple case of numerical simulation is conducted in order to validate the proposed method, and the results show that the proposed method can save fuel compared to a constant engine output voyage and constant speed voyage.