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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>
Efficient Procedural Modeling of Trees Based on Interactive Growth Volume Control
( Jinmo Kim ) 한국인터넷정보학회 2013 KSII Transactions on Internet and Information Syst Vol.7 No.9
The present study proposes efficient procedural modeling methods for enabling the growth and creation of various trees with minimal user control. Growth volume algorithms are utilized in order to easily and effectively calculate many parameters that determine tree growth, including branch propagation. Procedural methods are designed so that users` interactive control structures can be applied to these algorithms to create unique tree models efficiently. First, through a two-line-based interactive growth volume control method, the growth information that determines the overall shape of the tree is intuitively adjusted. Thereafter, independent branch control methods designed to control individual branches are added to the growth deformation in order to enable the growth of unique trees. Whether the growth processes of desired trees can be easily and intuitively controlled by the proposed method is verified through experiments. Methods that can apply the proposed methods are also verified.
Browning technology for shiitake in sawdust using LED source
Jinmo Koo,Sang-Hwa Lee,Sung-Hak Lee,Woo-Ram Park,Jae Soon Hwang,Minkyeong Kim,Hyungseo Jun,Hee-Young Jung,Woo-Sik Jo 한국버섯학회 2018 한국버섯학회지 Vol.16 No.4
The incorporation of Shiitake culture into sawdust is a widely utilized technique that can assist in reducing the cost and time consumption associated with oak cultivation. In sawdust cultivation, browning of the surface mycelia is an important stage with respect to the utility and longevity of the sawdust media. Surface browning forms a protective coating on the substrate, which can inhibit the invasion of pathogens and suppress water evaporation. Several different light sources (red LED, white LED, blue LED, and fluorescent light) were used and the intensity of illumination was carefully controlled (1.5, 10.5, 20.5 μmol/m2s for LEDs and 10, 100, 300 lux for the fluorescent light) to induce browning. The light sources were regulated via a 1 h on/off cycle in a controlled room environment at a temperature of 20°C, 60% humidity, and 1200 ppm CO2 concentration for 60days.The browning effect varied depending on the source and the intensity of illumination. This effect was most effectively induced at 1.5 μmol/m2s for the red and blue LEDs. All light sources induced less browning at the highest intensity of illumination. This indicates that intensity values higher than 20.5 μmol/m2s in the case of the LEDs and 300 lux for the fluorescent light are not effective. After harvesting of the fruit bodies, we measured the weight, length, and width of the pileus and stipe in addition to their chromaticity and hardness. Treatment with 1.5 μmol/m2s blue LED produced the best harvest with the highest average chromaticity, weight (21.2 g), stipe length (30.8 mm), and hardness (377.9 g), with a fine length and width of the pileus.