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Search Results: 1 - 10 of 21332 matches for " Jeong Song "
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Adventitious shoot regeneration from leaf explants of miniature paprika (Capsicum annuum) ‘Hivita Red’ and ‘Hivita Yellow’
JY Song, I Sivanesan, CG An, BR Jeong
African Journal of Biotechnology , 2010,
Abstract: A simple and efficient protocol was developed for in vitro propagation of two miniature paprika cultivars. Seeds of miniature paprika (Capsicum annuum) ‘Hivita Red’ and ‘Hivita Yellow’ were decontaminated and placed in a petri dish containing a half-strength MS medium and then were incubated in the dark for 7 10 days for germination. Leaf explants excised from one month-old aseptic seedlings were cultured on a MS medium supplemented with TDZ (0.1, 0.5, 1.0, 2.0, or 3.0 mgL-1) alone or in a combination with NAA (0.1 or 0.01 mgL-1) for four weeks. The highest number of regenerated shoot buds was obtained when leaf explants were cultured on a MS medium supplemented with 2.0 mgL-1 TDZ and 0.1 mgL-1 NAA with an average shoots per explant of 8.0 in ‘Hivita Red’ and 5.6 in ‘Hivita Yellow’. Regenerated shoot buds were separated and transferred onto a MS medium without growth regulators for shoot growth and rooting. Plantlets were successfully acclimatized in a greenhouse and cultivated for three months. After about two months, they started to produce flowers and continuously produced fruits. Morphology and fruit shape of regenerated plants were normal and plants set seeds as the same as to the seed-raised plants.
Schottky anomaly observed in 31P NMR for 31P-doped Si
Soonchil Lee,Minki Jeong,Myeonghun Song
Journal of Analytical Science & Technology , 2010,
Abstract: The Schottky anomaly, which happens when the heat capacity of nuclei is comparable to that of electrons, was observed in NMR for phosphorous doped silicon. The anomaly appears as an abnormal double exponential decay in the nuclear spin relaxation at very low temperature and high magnetic field. The initial fast exponential decay is the usual relaxation due to the interaction with free electrons but the slow decay in the 2nd stage is the process where the combined system of the nuclear spins and free electrons lose their energy to the liquid He bath. The double exponential decay diasppears above 1 K, where the heat capacity of the free electrons exceeds that of the nuclear spins. The result of the numerical calculation based on the assumption of the Schottky anomaly is also in consistence with the experimental observation.
Pillar switchings and acyclic embedding in mapping class group
Chan-Seok Jeong,Yongjin Song
Mathematics , 2012, DOI: 10.1142/S0129167X13501036
Abstract: The braid group $B_g$ is embedded in the ribbon braid group that is defined to be the mapping class group $\Gamma_{0,(g),1}$. By gluing two copies of surface $S_{0,g+2}$ along $g+1$ holes, we get surface $S_{g,1}$. A pillar switching is a self-homeomorphism of $S_{g,1}$ which switches two pillars of surfaces by $180{}^\circ$ horizontal rotation. We analyze the actions of pillar switchings on $\pi_1 S_{g,1}$ and then give concrete expressions of pillar switchings in terms of standard Dehn twists. The map $\psi: B_g \rightarrow \Gamma_{g,1}$ sending the generators of $B_g$ to pillar switchings on $S_{g,1}$ is defined by extending the embedding $B_g \hookrightarrow \Gamma_{0,(g+1),1}$. We show that this map is injective by analyzing the actions of pillar switchings on $\pi_1 S_{g,1}$. The second part of this paper is to prove that this map induces a trivial homology homomorphism in the stable range. For the proof we use the categorical delooping. We construct a suitable monoidal 2-functor from tile category to surface category and show that this functor thus induces a map of double loop spaces.
Structural Analysis of Offshore Cofferdam Subjected to Wave Load and Suction Pressure  [PDF]
Jeongsoo Kim, Youn-Ju Jeong, Min-Su Park, Sunghoon Song
Open Journal of Civil Engineering (OJCE) , 2018, DOI: 10.4236/ojce.2018.84040
Abstract: This study presented a novel circular cofferdam for offshore bridges consisting of ring segments and investigated its structural behaviors using ANSYS Mechanical. Because the bottom segment of the cofferdam which has a double sleeve cross-section was installed by suction, contact behaviors of the cofferdam wall and the lid plate during installation are important for design and the behaviors were also analyzed. Prior to numerical investigation of the bottom segment and complete cofferdam after dewatering, a suction modeling for structural analysis was proposed and evaluate by seepage analysis. Hydrodynamic loads applied to the cofferdam were also evaluated using panel method based on the potential flow theory. Through numerical analyses, structural behaviors of the cofferdam during installation were then investigated. First, contact behaviors between the lid plate and the wall were analyzed using different contact conditions imposed on the interface. Sharp stress increases were shown while the stress jumps were limited to contact area. Next, structural behaviors were investigated by considering seepage pressure. Using an axisymmetric seepage model, the total water pressure considering seepage was estimated and applied to structural analysis. The analysis results showed that strong effects of seepage on the stress change in cofferdam occurred and the seepage effects are necessary to be considered in design of the cofferdam induced by suction.
An Alternative Path for the Preparation of Triacetylcellulose from Unrefined Biomass  [PDF]
Hee Kyung Lim, Ha Young Song, Dal Rye Kim, Jeong Ho Ko, Sun Ah Lee, Kee-In Lee, In Taek Hwang
Advances in Chemical Engineering and Science (ACES) , 2015, DOI: 10.4236/aces.2015.51004
Abstract: An alternative path for the preparation of triacetylcellulose (TAC) from unrefined biomass Palm Empty Fruit Bunch (EFB) has been found with environmental benefits. The method comprises separation and regeneration of cellulose from lignocellulosic biomass dissolved in ionic liquid BMIMCl, and also modification of cellulose to TAC. The triacetylcellulose with a degree of substitution of 2.93 was obtained by the reaction of acetic anhydride at 55C with drastically reducing number of steps currently required to produce this derivative from raw materials itself. TAC was characterized using NMR analysis. The triacetate cellulose is typically used for the creation of fibers and film base.
Effective punching shear and moment capacity of flat plate-column connection with shear reinforcements for lateral loading
Jin-Kyu Song,Jubum Kim,Ho-Bum Song,Jeong-Won Song
International Journal of Concrete Structures and Materials , 2012, DOI: 10.1007/s40069-012-0002-3
Abstract: In this study, three isolated interior flat slab-column connections that include three types of shear reinforcement details; stirrup, shear stud and shear band were tested under reversed cyclic lateral loading to observe the capacity of slab-column connections. These reinforced joints are 2/3 scale miniatures designed to have identical punching capacities. These experiments showed that the flexural failure mode appears in most specimens while the maximum unbalanced moment and energy absorbing capacity increases effectively, with the exception of an unreinforced standard specimen. Finally, the results of the experiments, as wel l as those of experiments previously carried out by researchers, are applied to the eccentricity shear stress model presented in ACI 318-08. The failure mode is therefore defined in this study by considering the upper limits for punching shear and unbalanced momen t. In addition, an intensity factor is proposed for effective widths of slabs that carry an unbalanced moment delivered by bending.
Delay-Dependent Control and Stability Analysis for T-S Fuzzy Systems with a Sensor Delay
Mirim Ha,Changki Jeong,Ju-man Song,PooGyeon Park
Lecture Notes in Engineering and Computer Science , 2011,
Abstract:
Experience and analysis of Delphian lymph node metastasis in patients with papillary thyroid carcinoma
Kim Won,Yang Song I,Kim Jeong,Choi Young
World Journal of Surgical Oncology , 2012, DOI: 10.1186/1477-7819-10-226
Abstract: Background Recently, lymph node metastasis (LNM) has been regarded as an important factor influencing loco-regional recurrence and survival rate in papillary thyroid cancer (PTC) patients. The aims of this study were to investigate the detection rate and metastasis rate of the Delphian lymph node (DLN) and clinical patterns related to regional LNM, and to examine how DLN metastasis affects PTC treatment. Methods We reviewed the medical records of 413 patients with pathologically confirmed PTC from among 452 patients who underwent thyroid surgery between January 2010 and October 2010 in the Department of Endocrine Surgery at Kosin University Gospel Hospital in Busan, South Korea. Results Multivariate analyses revealed a significantly higher proportion of cases with lymphovascular invasion (56.6% vs. 12.5%, P <0.001), central neck node metastasis (88.6% vs. 34.5%, P <0.001) and lateral neck node metastasis (47.2% vs. 10.2%, P <0.005) among cases with DLN metastasis compared to those without. The negative predictive value (NPV) of DLN metastasis with regard to the presence of contralateral central LNM for cases with a tumor size 1 cm or smaller than 1 cm was found to be 93.3% (127/136). Conclusion When DLN metastasis is not detected in papillary thyroid microcarcinomas (PTMC), thyroid lobectomy on the affected side and ipsilateral central neck lymph node dissection should be sufficient. In addition, even in cases where lateral neck LNM is not detected on preoperative examination, if DLN metastasis is detected postoperatively, more careful attention should be paid to the lateral neck nodes during follow-up.
Proliferation-Stimulating Effect of Colony Stimulating Factor 2 on Porcine Trophectoderm Cells Is Mediated by Activation of Phosphatidylinositol 3-Kinase and Extracellular Signal-Regulated Kinase 1/2 Mitogen-Activated Protein Kinase
Wooyoung Jeong, Jinyoung Kim, Fuller W. Bazer, Gwonhwa Song
PLOS ONE , 2014, DOI: 10.1371/journal.pone.0088731
Abstract: Colony-stimulating factor 2 (CSF2), also known as granulocyte macrophage colony-stimulating factor, facilitates mammalian embryonic development and implantation. However, biological functions and regulatory mechanisms of action of porcine endometrial CSF2 in peri-implantation events have not been elucidated. The aim of present study was to determine changes in cellular activities induced by CSFs and to access CSF2-induced intracellular signaling in porcine primary trophectoderm (pTr) cells. Differences in expression of CSF2 mRNA in endometrium from cyclic and pregnant gilts were evaluated. Endometrial CSF2 mRNA expression increases during the peri-implantation period, Days 10 to 14 of pregnancy, as compared to the estrous cycle. pTr cells obtained in Day 12 of pregnancy were cultured in the presence or absence of CSF2 (20 ng/ml) and LY294002 (20 μM), U0126 (20 μM), rapamycin (20 nM), and SB203580 (20 μM). CSF2 in pTr cell culture medium at 20 ng/ml significantly induced phosphorylation of AKT1, ERK1/2, MTOR, p70RSK and RPS6 protein, but not STAT3 protein. Also, the PI3K specific inhibitor (LY294002) abolished CSF2-induced increases in p-ERK1/2 and p-MTOR proteins, as well as CSF2-induced phosphorylation of AKT1. Changes in proliferation and migration of pTr cells in response to CSF2 were examined in dose- and time-response experiments. CSF2 significantly stimulated pTr cell proliferation and, U0126, rapamycin and LY294002 blocked this CSF2-induced proliferation of pTr cells. Collectively, during the peri-implantation phase of pregnancy in pigs, endometrial CSF2 stimulates proliferation of trophectoderm cells by activation of the PI3K-and ERK1/2 MAPK-dependent MTOR signal transduction cascades.
Smart Control Algorithms and Technology in Civil Infrastructures
Hongnan Li,Gangbing Song,Jeong-Tae Kim,Gang Li
Mathematical Problems in Engineering , 2014, DOI: 10.1155/2014/842802
Abstract:
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