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MHD Instability Fluctuation Measurement on the HL-2A Tokamak by Using the HCN Laser Interferometer
Y. G. Li,Y. Zhou,Z. C. Deng,J. Yi,Y. Li,H. X. Wang,X. Q. Ji,W. Deng 한국물리학회 2014 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.65 No.8
The multichannel HCN laser interferometer has been routinely used to measure the electron density(ne) on the HL-2A tokamak for several years. In order to explore its capability for qualitativelyevaluating the Magnetohydrodynamic (MHD) fluctuation in plasmas from the probing signal, weimplemented two important modifications on the hardware of channel #3 (r = −10.5 cm): (1) applicationof the high-response Schottky diode waveguide detector, and (2) utilization of a preamplifierwith a broad pass-band of up to 500 kHz so as not to filter the fluctuation component mixed withthe intermediate frequency (IF). Many MHD fluctuation phenomena, such as tearing modes (TMs),fishbones, long lived modes (LLMs), have been successfully detected by using the modified channel#3 in the HL-2A experimental campaign, and the results were quite coincident with those derivedfrom the magnetic probe and the soft X-ray systems. We propose to apply this novel approach tomore channels of the HCN laser interferometer.
Yi, Y.J.,Li, Z.H.,Kim, E.S.,Song, E.S.,Cong, P.Q.,Zhang, Y.H.,Lee, S.H.,Lee, J.W.,Park, Chang-Sik Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.8
This study was designed to develop a method of liquid storage of boar sperm at $4^{\circ}C$ by using the modified Beltsville F5 (BF5) diluent with bovine serum albumin (BSA) and N-acetyl-D-glucosamine. Boar sperm were stored in lactose-egg yolk and N-acetyl-D-glucosamine (LEN), BF5 and Golden-Pig liquid 4 (GPL4) diluents at $4^{\circ}C$ for 5 days and were examined for sperm viability, adenosine triphosphate (ATP) and in vitro fertilization (IVF). The percentage of sperm viability in GPL4 diluent was higher than in LEN and BF5 diluent from 1 to 5 days of storage at $4^{\circ}C$. The percentage of sperm viability steadily declined from 1 to 5 days of storage in the three different diluents. Sperm ATP in GPL4 diluent was higher than in LEN and BF5 diluents from 1 to 5 days of storage. Sperm ATP rapidly declined after 5 days of storage in the three different diluents. Porcine oocytes matured in vitro were inseminated with different sperm concentrations of liquid semen stored for 3 days in GPL4 diluent. The percentage of monospermic oocytes did not show any differences from 2.5 to $20{\times}10^5$ sperm/ml. However, the percentage of polyspermic oocytes in the sperm concentration of $2.5{\times}10^5$ sperm/ml was lower than in concentrations of 5, 10 and $20{\times}10^5$5 sperm/ml. The percentage of blastocysts from the cleaved oocytes at $2.5{\times}10^5/ml$ sperm concentration was significantly lower than at 5, 10 and $20{\times}10^5sperm/ml$ concentrations. In conclusion, GPL4 diluent can be stored at $4^{\circ}C$ for 5 days and showed higher sperm viability and sperm ATP concentration compared with LEN and BF5 diluents. Also, we found that GPL4 diluent can be used for IVF of porcine oocytes.
Yi, J.Q.,Piao, X.S.,Li, Z.C.,Zhang, H.Y.,Chen, Y.,Li, Q.Y.,Liu, J.D.,Zhang, Q.,Ru, Y.J.,Dong, B. Asian Australasian Association of Animal Productio 2013 Animal Bioscience Vol.26 No.8
Two experiments were conducted to evaluate the effect of supplementing a corn-soybean meal-based diet with an enzyme complex containing amylase, protease and xylanase on the performance, intestinal health, apparent ileal digestibility of amino acids and nutrient digestibility of weaned pigs. In Exp. 1, 108 piglets weaned at 28 d of age were fed one of three diets containing 0 (control), 100, or 150 ppm enzyme complex for 4 wks, based on a two-phase feeding program namely 1 to 7 d (phase 1) and 8 to 28 d (phase 2). At the end of the experiment, six pigs from the control group and the group supplemented with 150 ppm enzyme complex were chosen to collect digesta samples from intestine to measure viscosity and pH in the stomach, ileum, and cecum, as well as volatile fatty acid concentrations and composition of the microflora in the cecum and colon. There were linear increases (p<0.01) in weight gain, gain: feed ratio and digestibility of gross energy with the increasing dose rate of enzyme supplementation during the whole experiment. Supplementation with enzyme complex increased the digesta viscosity in the stomach (p<0.05) and significantly increased (p<0.01) the concentrations of acetic, propionic and butyric acid in the cecum and colon. Enzyme supplementation also significantly increased the population of Lactobacilli (p<0.01) in the cecum and decreased the population of E. coli (p<0.05) in the colon. In Exp. 2, six crossbred barrows (initial body weight: $18.26{\pm}1.21$ kg), fitted with a simple T-cannula at the distal ileum, were assigned to three dietary treatments according to a replicated $3{\times}3$ Latin Square design. The experimental diets were the same as the diets used in phase 2 in Exp. 1. Apparent ileal digestibility of isoleucine (p<0.01), valine (p<0.05) and aspartic acid (p<0.05) linearly increased with the increasing dose rate of enzyme supplementation. In conclusion, supplementation of the diet with an enzyme complex containing amylase, protease and xylanase improved piglet performance. This is likely a result of improvement in nutrient digestibility, volatile fatty acid concentrations and bacteria ratio in the large intestine.
Path-tracking simulation and field tests for an auto-guidance tillage tractor for a paddy field
Han, X.Z.,Kim, H.J.,Kim, J.Y.,Yi, S.Y.,Moon, H.C.,Kim, J.H.,Kim, Y.J. Elsevier 2015 Computers and electronics in agriculture Vol.112 No.-
The application of an auto-guided tractor to rice cultivation in Korean paddy fields may be limited by tire slippage and headland turning due to wet soil conditions and the use of small-sized fields<1ha. This study examines the development of a computer simulator capable of virtually testing the motion of a tractor based on a look-ahead distance method in a real-time 3D graphic environment. The tractor motion was simulated based on the dynamic model of a vehicle that considered the effects of tire slippage and side force imparted by soil. The validity of the computer simulation was confirmed by a paved road test, thereby providing tracking trajectories similar to those obtained from the road test. However, an oscillation in the steering angle, ranging from -8 to +5deg., occurred when the tractor traveled on straight paths. This oscillation might be related to the limitations of the electric motor in controlling the tractor's hydraulic steering system due to the non-linear response of the hydraulic actuator to the rotation of the steering wheel by motor torque. In an arable field (90mx25m), the auto-guided tractor followed the predefined path including C-shape headland turning with acceptable tracking, showing RMS lateral errors ranging from 3.8 to 12.8cm on the straight paths. However, RMS lateral errors obtained on the curved paths increased to 100cm when the tractor traveled in a wet sub-field with moisture content>30%, thereby requiring more accurate estimation of sliding parameters.
Yi, Y.J.,Li, Z.H.,Kim, E.S.,Song, E.S.,Kim, H.B.,Cong, P.Q.,Lee, J.M.,Park, Chang-Sik Asian Australasian Association of Animal Productio 2008 Animal Bioscience Vol.21 No.2
This study was designed to analyze boar sperm to compare motility, acrosome morphology, viability and ATP by various preservation methods between Duroc boar A with cold shock resistance sperm and Duroc boar B with cold shock sensitivity sperm. Semen volume, sperm concentration, motility and normal acrosome between Duroc boar A and B did not show any differences within 2 h after collection. There were no differences in sperm motility and normal acrosome between boar A and B at 1 day of preservation at $17^{\circ}C$ and $4^{\circ}C$, respectively. However, sperm motility and normal acrosome from 2 day of preservation at $17^{\circ}C$ and $4^{\circ}C$, respectively, were higher for boar A than boar B. The frozen-thawed sperm motility and normal acrosome were higher for boar A than boar B. The sperm viability and ATP concentration according to storage period of liquid semen at $17^{\circ}C$ and $4^{\circ}C$ were higher for boar A than boar B. Also, the sperm viability and ATP concentration of frozen-thawed semen were higher for boar A than boar B. In conclusion, we found out that the original quality of boar semen with cold shock resistance sperm played an important role.
Yi, A-L,Yan, L-S,Luo, B,Pan, W,Ye, J,Chen, Z-Y,Lee, J H Optical Society of America 2012 Optics express Vol.20 No.9
<P>Simultaneous all-optical RZ-OOK to NRZ-OOK format conversion for two tributaries in PDM signal is demonstrated utilizing a single section of highly nonlinear fiber through polarization nonlinear loop mirror configuration. Less than 1-dB power penalty is achieved in a 2 ?? 12.5-Gb/s PDM system, and only 1.4-dB SNR penalty is obtained in a 2 ?? 40-Gb/s PDM system.</P>
Sun, Z.,Mohamed, M.A.A.,Park, S.Y.,Yi, T.H. Elsevier Science 2015 INTERNATIONAL IMMUNOPHARMACOLOGY Vol.29 No.2
Fucosterol is a phytosterol commonly extracted from algae. It has been proved that fucosterol possesses antioxidant activity that is capable of scavenging the free radicals causing skin damages. In this study, we investigated the protective mechanisms of fucosterol on cobalt chloride (CoCl<SUB>2</SUB>) induced hypoxia damages to keratinocytes (HaCaT). We found that fucosterol inhibited CoCl<SUB>2</SUB> induced cytotoxicity and inflammation in a dose-dependent manner. Furthermore, fucosterol attenuated CoCl<SUB>2</SUB> induced excess expression of IL-6, IL-1β and TNF-α in HaCaT cells. In addition, fucosterol surpressed the phosphorylation of PI3K and Akt and accumulation of HIF1-α simulated by CoCl<SUB>2</SUB>. Taken together, these results suggested that fucosterol executed its protective effects against CoCl<SUB>2</SUB> induced cytotoxicity and inflammation by the inhibition of hypoxia inducible factor through PI3K/Akt pathway.
Rahman, Z.,Sung, B.H.,Yi, J.Y.,Bui, L.M.,Lee, J.H.,Kim, S.C. Elsevier Science Publishers 2014 Journal of biotechnology Vol.192 No.1
Alkanes chemically mimic hydrocarbons found in petroleum, and their demand as biofuels is steadily increasing. Biologically, n-alkanes are produced from fatty acyl-ACPs by acyl-ACP reductases (AARs) and aldehyde deformylating oxygenases (ADOs). One of the major impediments in n-alkane biosynthesis is the low catalytic turnover rates of ADOs. Here, we studied n-alkane biosynthesis in Escherichia coli using a chimeric ADO-AAR fusion protein or zinc finger protein-guided ADO/AAR assembly on DNA scaffolds to control their stoichiometric ratios and spatial arrangements. Bacterial production of n-alkanes with the ADO-AAR fusion protein was increased 4.8-fold (24mg/L) over a control strain expressing ADO and AAR separately. Optimal n-alkane biosynthesis was achieved when the ADO:AAR binding site ratio on a DNA scaffold was 3:1, yielding an 8.8-fold increase (44mg/L) over the control strain. Our findings indicate that the spatial organization of alkane-producing enzymes is critical for efficient n-alkane biosynthesis in E. coli.