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- 저자 : Xue Gong (검색결과 57 건)
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Gong, Xue,Flores-Vergara, Miguel A.,Hong, Jing Han,Chu, Huangwei,Lim, Jun,Franks, Robert G.,Liu, Zhongchi,Xu, Jian American Society of Plant Biologists 2016 Plant Physiology Vol.170 No.3
<P>A decade of studies on middle cortex (MC) formation in the root endodermis of Arabidopsis (Arabidopsis thaliana) have revealed a complex regulatory network that is orchestrated by several GRAS family transcription factors, including SHORT-ROOT (SHR), SCARECROW (SCR), and SCARECROW-LIKE3 (SCL3). However, how their functions are regulated remains obscure. Here we show that mutations in the SEUSS (SEU) gene led to a higher frequency of MC formation. seu mutants had strongly reduced expression of SHR, SCR, and SCL3, suggesting that SEU positively regulates these genes. Our results further indicate that SEU physically associates with upstream regulatory sequences of SHR, SCR, and SCL3; and that SEU has distinct genetic interactions with these genes in the control of MC formation, with SCL3 being epistatic to SEU. Similar to SCL3, SEU was repressed by the phytohormone GA and induced by the GA biosynthesis inhibitor paclobutrazol, suggesting that SEU acts downstream of GA signaling to regulate MC formation. Consistently, we found that SEU mediates the regulation of SCL3 by GA signaling. Together, our study identifies SEU as a new critical player that integrates GA signaling with transcriptional inputs from the SHR-SCR-SCL3 module to regulate MC formation in the Arabidopsis root.</P>
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MICROWAVE-ASSISTED SYNTHESIS AND CATALYTIC PERFORMANCE OF HIERARCHICAL Cu2O NANOSTRUCTURES
XUE-YUN GONG,YU-PENG GAO,LI-BO WANG,PENG-FEI GUO 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2013 NANO Vol.8 No.5
Hierarchical Cu2O nanostructures have been successfully fabricated on a large scale using copper acetate and glucose as starting reactants, CTAB as an additive via a microwave-assisted process. The influences of CTAB dosage and reaction time on the morphology of the products were investigated. The resulting Cu2O nanostructures were characterized by means of X-ray diffraction (XRD) and field emission scanning electron microscopy (FESEM). FESEM images show that the Cu2O nanostructures are microsphere, which are composed of nanoparticles. The concentration of CTAB plays a key role in the growth of Cu2O nanostructures under experimental conditions. The possible formation mechanism of these hierarchical Cu2O nanostructures has been proposed. Meanwhile, the catalytic performances of these Cu2O microspheres for thermal decomposition of ammonium perchlorate (AP) were investigated using DSC. The results revealed that Cu2O have a great influence on the thermal decomposition of AP. The additions of Cu2O powders lower the high decomposition temperature of AP.
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NUMERICAL SIMULATION OF SYNOPTIC CONDITION ON A SEVERE SAND DUST STORM
JIANG, XUE-GONG,SHEN, JIAN-GUO,LIU, JING-TAO,CHUNG, YONG-SEUNG 한국교원대학교 환경과학연구소 2004 환경연구논문집 Vol.- No.8
By using observational data and MM5, an observational analysis and numerical study was conducted on the synoptic condition of a severe dust storm that was caused by a Mongolian cyclone which occurred from 6 to 8 April 2001. Results illustrated that the cyclogenesis was due to the isentropic potential voiticity (IPV) advection in the upper troposphere and the terrain modified baroclinicity in the mid-lower troposphere. The Altai-Sayan complex of mountains blocked the lower level cold air and made the isentropic surface sharply sleep. When the air slid down along the isentropic surface the increasing of baroclinicity and decreasing of stability blew up the vertical voiticity development. The formation of the dust storm was a result of a cyclonic cold front passing across the area. The occurrence of this dust storm was closely related to the strong surface wind, which was accompanied by a cold front passing, rather than the cyclogenesis, itself. Hence, the reason for the pre-front dust stonn formulation was the formation of heating convection. Reasons behind the formation of a black storm (visibility lower than 50 m), which occurred in the mid-north part of Inner Mongolia, lay in several aspects. Firstly, in this area the surface wind was strong, a direct result of the downward transport in mid-lower troposphere. Secondly, the cold front passed over the effected area near sunset so the air obtained much more surface heating to form a deeper mixed layer (ML). Thirdly, cooperation between the lower level wind and the terrain made the atmosphere in this area and acquired the maximum advective contribution necessary to form a deep post-front ML. The sensitivity experiment revealed that surface heal flux was important to the frontal lifting. In addition, the forcing of surface heating was also seen as the primary forcing mechanism of frontogenesis. Meanwhile, removal of the surface heat flux made the atmospheric stratification became stable and the pre-storm ML very shallow, which weakened the strength of the dust storm.
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Throughput Maximization in Cooperation Based Symbiotic Cognitive Radio Networks
XUE, Peng,GONG, Peng,KIM, Duk Kyung The Institute of Electronics, Information and Comm 2010 IEICE TRANSACTIONS ON COMMUNICATIONS - Vol.93 No.11
<P>In the symbiotic cognitive radio (CR) networks, the CR users (CUs) may assist the primary transmission in a cooperation time, and obtain an incentive time for their own data transmission. In this letter, we study the throughput maximization problem in the symbiotic CR networks. Under the symbiosis and transmit power constraints, we aim to find the optimal cooperation time to assist the primary transmission and power allocations among the CUs. Given the cooperation time, the optimal power allocations can be solved by multi-level water-filling (MWF) with individual volume limits. A theoretical analysis is presented on the cooperation time and a modified bisection algorithm with low complexity is proposed to find the sub-optimal cooperation time. Simulation results show that the spectrum usage efficiency can be significantly improved as the number of CUs increases.</P>
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Performance Enhancement of IEEE 802.15.3 MAC for Simultaneously Operating Piconets
Xue Peng(설붕),Gong Peng(공붕),Duk Kyung Kim(김덕경) 한국통신학회 2007 한국통신학회논문지 Vol.32 No.1A
In the IEEE 802.15.3 Medium Access Control (MAC) protocol, Simultaneously Operating Piconets (SOPs) are linked by the parent/child (P/C) or parent/neighbor (P/N) configuration, which work on a Time Division Multiple Access (TDMA) basis. This provides interference mitigation but the overall throughput is limited because the SOPs share the channel time exclusively. The protocol is not efficient for SOPs if we focus on the combination of interference mitigation and high throughput maintenance. In this paper Public Channel Time Allocation (Public CTA) is proposed, which is able to greatly reduce the inter-piconet interference (IPI) and achieve greater throughput without much loss of link success probability (LSP) in the SOPs. The simulation results based on the SOPs of Direct Sequence Ultra Wideband (DS-UWB) system demonstrate that the proposed scheme effectively supports the coexistence of SOPs, and it can not only significantly improve the overall throughput of SOPs but also maintain high LSP.
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Xue-Ni Cheng,Yan-Wen Gong 대한환경공학회 2018 Environmental Engineering Research Vol.23 No.2
The feasibility of applying coagulation-integrated microfiltration (MF) as a pretreatment for an ultrafiltration (UF) feed in oily wastewater treatment was investigated. The effects of different coagulants on oil removal rates from wastewater were studied. The maximum oil removal rate of 82% was obtained after coagulation with 130 mg/L of polyaluminium chloride (PAC). UF flux reached 95 L/(㎡·h) with coagulation-integrated MF as pretreatment. This value was 2.5 times higher than that flux obtained without pretreatment. The value of UF flux increased as the transmembrane pressure (TMP) and cross-flow velocity (CFV) of the UF module increased. UF flux gradually increased when TMP and CFV exceeded 0.4 MPa and 3 m/s, respectively, because of concentration polarization and membrane fouling stabilization. Chemical oxygen demand reduction and oil removal rate reached 95.2% and 98.5%, respectively, during integrated membrane processing with a PAC concentration of 130 mg/L, TMP of 0.4 MPa, and CFV of 3 m/s for UF. In addition, sequentially cleaning the fouling membrane with NaOH and HNO₃ aqueous solutions caused UF flux to recover to 90%. These encouraging results suggested that the hybrid integrated membrane process-based coagulation and MF + UF are effective approaches for oily wastewater treatment.
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Anti-Oxidation of Cultured Cordyceps militaris Growing on Silkworm Pupa
Gong Cheng-Liang,Pan Zhong-Hua,Zheng Xiao-Jian,Xue Ren-Yu,Cao Guang Li Korean Society of Sericultural Science 2006 International Journal of Industrial Entomology Vol.12 No.1
Cordyceps, one of the well-known traditional Chinese medicines, consists of the dried fungus C. sinensis growing on the larva of caterpillar. It is commonly used as a tonic of restoring vital body functions. In order to evaluate the pharmacological effects of C. militaris, the anti-oxidation and antiaging effect of cultured C. militaris growing on pupa of silkworm Bombyx mori, were investigated. The results showed! that the contents of lipofusin in myocardium were reduced and the SOD activity in the liver were elevated in a dose-dependent manner while no effect was observed for blood GSH-Px activity and liver MDA content in mice perfused with the cultured C. militaris compared to those untreated mice. Furthermore, the average life span, maximum life span and 50% death time of the fruit flies treated with cultured C. militaris were markedly prolonged. The results suggest that the cultured C. militaris growing on pupa of silkworm possesses anti-oxidation and delay senescence activity.
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