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      • KCI등재

        Oral Administration of Novel Oriental Medicine, KIOM-C, Protect against Influenza Virus

        Jin,Yeul,Ma,,Eun,Ha,Kim,,Jun,Han,Lee,,Min-Suk,Song,,Yun,Hee,Baek,,Young,Ki,Choi 충북대학교 동물의학연구소 2012 Journal of Biomedical and Translational Research Vol.13 No.2

        The influenza virus is an important respiratory risk affecting humans, and effective treatments are needed. Some oriental medicines are currently applied for treatment of common colds as well as influenza infection. Previous studies have reported that the therapeutic properties of MA-128 are effective for treatment of psoriasis antiasthmatic and atopic dermatitis. In this study, we investigated the therapeutic properties of the novel herbal medicine, MA-128, for treatment of influenza virus infection by oral administration. MA-128 is an active natural biological compound from herbal-marine origin. The results showed that oral administration of MA-128 in mice could confer a survival benefit against Type A influenza virus infection. Daily oral administration of MA- 128 resulted in delayed death in infected mice for three days against mouse adapted H3N2 (A/Philippines/2/82). However, it protected more than 60% of mice from lethal infection of 2009 pandemic H1N1 (A/Korea/CJ01/2009) influenza virus. In addition, lung viral titers were significantly reduced at seven days post infection (~100 times) compared with mock-treated mice and viruses were cleared at 9 dpi only in the MA-128 treated groups. This study demonstrated the potential of the novel herbal medicine, MA-128, as an herbal remedy against influenza A viruses.

      • SCOPUS

        A Short Term Load Forecasting Model Using Core Vector Regression Optimized by Memetic Algorithm

        Yuancheng,Li,Rong,Ma,Liqun,Yang,Pu,Chen 보안공학연구지원센터 2016 International Journal of Control and Automation Vol.9 No.6

        In this paper, a new model, core vector regression (CVR) optimized by memetic algorithm (MA), is presented to predict electric daily load. Support vector regression (SVR) has obtained wide focus in recent years to solve nonlinear regression problems in many fields. However, it is limited on large scale dataset problem because of its high time and space complexity. Hence, CVR is proposed to improve the SVR on solving large scale dataset problem. Proper parameters selection of CVR model determines the complexity and accuracy of the model. In this paper, MA is proposed to optimize the parameters of CVR, which is called MA-CVR. Electric load is the time-dependent data which shows recurrent pattern weekly, seasonally and yearly. In this paper, we adopt MA optimization method and choose adaptive parameters dynamically based on time recurrent character of electric load data. Experimental results show that MA-CVR outperforms the existing model optimized by genetic algorithm which is called GA-CVR.

      • KCI등재

        Reactive Compatibilization of Ethylene-co-Vinyl Acetate/Starch Blends

        Piming,Ma,Denka,Georgieva,Hristova-Bogaerds,Pauline,Schmit,Johannes,Gerardus,Petrus,Goossens,Pieter,Jan,Lemstra 한국고분자학회 2012 Macromolecular Research Vol.20 No.10

        The dispersion of starch as a filler in hydrophobic ethylene-co-vinyl acetate (EVA) rubber is an issue. To obtain a fine dispersion of starch in EVA rubber, EVA/starch blends were prepared by reactive extrusion in the presence of maleic anhydride (MA), benzoyl peroxide (BPO), and glycerol. MA, BPO, and glycerol play the role of coupling agent, free-radical initiator, and plasticizer, respectively. Molau experiment and Fourier transform infrared spectroscopy (FTIR) results showed that EVA chains were grafted onto the surface of starch particles during reactive extrusion via a free-radical grafting mechanism. As a result, EVA-g-starch copolymers acted as a compatibilizer,leading to fine dispersion of starch and strong interfacial adhesion between the starch and the EVA matrix. Scanning electron microscope (SEM) images showed that the starch particle size reduced from hundreds micrometers in the case of physical blending to approximately 1 micrometer in the case of reactive blending, and consequently, the EVA rubber was effectively reinforced by the incorporation of starch and the reactive compatibilization (e.g., the tensile strength of the EVA/starch (50/50, wt/wt) was increased by a factor of 6 after the addition of 0.9-1.8 wt% MA). The property stability of starch compounds is usually an issue, while the mechanical properties of the (compatibilized)EVA/starch blends reported in this article were stable during storage

      • KCI등재

        Early Cretaceous diorites in the Kenbale Cu mineralization occurrence, Tibet, China, and its geological significance

        Liqiang,Wang,Yong,Wang,Wangxiu,Danzhen,Daihai,Ma 한국지질과학협의회 2019 Geosciences Journal Vol.23 No.2

        The Kenbale Cu mineralization occurrence related to the diorite is a newly discovered Cu mineralization event in the Bangong-Nujiang metallogenic belt, Tibet, China. The Cu mineralization is hosted in the contact between the monzogranite or biotite quartz diorite and the fine-grained diorite, which is the mineralization related intrusion. In order to constrain the Kenbale mineralization age, petrogenesis and tectonic setting, we conducted LA-ICP-MS zircon U-Pb dating and Hf isotopic analyses of the biotite quartz diorite and fine-grained diorite and also the whole-rock geochemical study of the biotite quartz diorite. Zircon UPb dating show that weighted mean 206Pb/238U ages of the biotite quartz diorite and fine-grained diorite are 123.5 ± 1.9 Ma (MSWD = 2.3, n = 16) and 118.9 ± 1.3 Ma (MSWD = 2.5, n = 18), respectively. The biotite quartz diorite is a high-K calc-alkaline I-type magma rock and was controlled mainly by partial melting process during the magma formation and evolution. This intrusion is characterized by positive εHf(t) values (2.6 to 5.8) and old Hf crustal model ages (813 to 1016 Ma), indicating that the magma was sourced from partial melting of the Mesoproterozoic to Neoproterozoic juvenile crust of the northern Lhasa Terrane. Compared with the biotite quartz diorite, the mineralization associated fine-grained diorite has much higher zircon εHf(t) values (8.2 to 11.4) and younger Hf crustal model ages (450 to 650 Ma). These characteristics are similar with those of the coeval magmatic rocks induced by slab break-off of the southward subducted Bangong-Nujiang Ocean. The geochronology and geochemical results show that the Kenbale Cu mineralization was controlled by the slab break-off of the southward subducted Bangong-Nujiang Ocean.

      • SCIESCOPUSKCI등재

        Space-Time Quantization and Motion-Aligned Reconstruction for Block-Based Compressive Video Sensing

        Li,,Ran,Liu,,Hongbing,He,,Wei,Ma,,Xingpo Korean Society for Internet Information 2016 KSII Transactions on Internet and Information Syst Vol.10 No.1

        The Compressive Video Sensing (CVS) is a useful technology for wireless systems requiring simple encoders but handling more complex decoders, and its rate-distortion performance is highly affected by the quantization of measurements and reconstruction of video frame, which motivates us to presents the Space-Time Quantization (ST-Q) and Motion-Aligned Reconstruction (MA-R) in this paper to both improve the performance of CVS system. The ST-Q removes the space-time redundancy in the measurement vector to reduce the amount of bits required to encode the video frame, and it also guarantees a low quantization error due to the fact that the high frequency of small values close to zero in the predictive residuals limits the intensity of quantizing noise. The MA-R constructs the Multi-Hypothesis (MH) matrix by selecting the temporal neighbors along the motion trajectory of current to-be-reconstructed block to improve the accuracy of prediction, and besides it reduces the computational complexity of motion estimation by the extraction of static area and 3-D Recursive Search (3DRS). Extensive experiments validate that the significant improvements is achieved by ST-Q in the rate-distortion as compared with the existing quantization methods, and the MA-R improves both the objective and the subjective quality of the reconstructed video frame. Combined with ST-Q and MA-R, the CVS system obtains a significant rate-distortion performance gain when compared with the existing CS-based video codecs.

      • KCI등재

        Sodium Alginate-Assisted Synthesis of PdAg Bimetallic Nanoparticles and their Enhanced Activity for Electrooxidation of Ethanol

        Yanru,Yin,Changna,Wen,Ning,Ma,Baoyan,Wang,Lianying,Zhang,Hongliang,Li,Peizhi,Guo 성균관대학교(자연과학캠퍼스) 성균나노과학기술원 2019 NANO Vol.14 No.9

        Palladium and palladium-silver bimetallic nanocrystals have been synthesized hydrothermally by using environmental-friendly sodium alginate as the stabilizer and reducing agent. The pure palladium nanoparticles were spherical-like possibly due to the principle of the lowest surface energy, however, the formation of bimetallic palladium-silver nanoparticles was much more complicated, which was thinner and more irregular nanostructures than pure palladium nanoparticles. Electrochemical measurements showed that the electrocatalytic activity toward ethanol oxidation was increased first with the increase of silver content in bimetallic nanoparticles, from pure palladium of around 1070 mA/mg, to PdAg-20 of 1160 mA/mg and to PdAg-10 of 1750 mA/mg, and declined greatly at a high content of silver, approximately 279 mA/mg. Electrochemical stability test showed that PdAg-10 and PdAg-5 were the best and worst among four palladium-based samples, respectively. Based on the experimental data, the formation mechanism of pure palladium and palladium-silver bimetallic nanoparticles and the structure-property relationship of these samples have been discussed.

      • KCI등재SCOPUS

        Space-Time Quantization and Motion-Aligned Reconstruction for Block-Based Compressive Video Sensing

        ( Ran Li ), ( Hongbing Liu ), ( Wei He ), ( Xingpo Ma ) 한국인터넷정보학회 2016 KSII Transactions on Internet and Information Syst Vol.10 No.1

        The Compressive Video Sensing (CVS) is a useful technology for wireless systems requiring simple encoders but handling more complex decoders, and its rate-distortion performance is highly affected by the quantization of measurements and reconstruction of video frame, which motivates us to presents the Space-Time Quantization (ST-Q) and Motion-Aligned Reconstruction (MA-R) in this paper to both improve the performance of CVS system. The ST-Q removes the space-time redundancy in the measurement vector to reduce the amount of bits required to encode the video frame, and it also guarantees a low quantization error due to the fact that the high frequency of small values close to zero in the predictive residuals limits the intensity of quantizing noise. The MA-R constructs the Multi-Hypothesis (MH) matrix by selecting the temporal neighbors along the motion trajectory of current to-be-reconstructed block to improve the accuracy of prediction, and besides it reduces the computational complexity of motion estimation by the extraction of static area and 3-D Recursive Search (3DRS). Extensive experiments validate that the significant improvements is achieved by ST-Q in the rate-distortion as compared with the existing quantization methods, and the MA-R improves both the objective and the subjective quality of the reconstructed video frame. Combined with ST-Q and MA-R, the CVS system obtains a significant rate-distortion performance gain when compared with the existing CS-based video codecs.

      • SCIESCOPUSKCI등재후보

        Scale model experimental of a prestressed concrete wind turbine tower

        Ma,,Hongwang,Zhang,,Dongdong,Ma,,Ze,Ma,,Qi Techno-Press 2015 Wind and Structures, An International Journal (WAS Vol.21 No.3

        As concrete wind-turbine towers are increasingly being used in wind-farm construction, there is a growing need to understand the behavior of concrete wind-turbine towers. In particular, experimental evaluations of concrete wind-turbine towers are necessary to demonstrate the dynamic characteristics and load-carrying capacity of such towers. This paper describes a model test of a prestressed concrete wind-turbine tower that examines the dynamic characteristics and load-carrying performance of the tower. Additionally, a numerical model is presented and used to verify the design approach. The test results indicate that the first natural frequency of the prestressed concrete wind turbine tower is 0.395 Hz which lies between frequencies 1P and 3P (0.25-0.51 Hz). The damper ratio is 3.3%. The maximum concrete compression stresses are less than the concrete design compression strength, the maximum tensile stresses are less than zero and the prestressed strand stresses are less than the design strength under both the serviceability and ultimate limit state loads. The maximum displacement of the tower top are 331 mm and 648 mm for the serviceability limit state and ultimate limit state, respectively, which is less than L/100 = 1000 mm. Compared with traditional tall wind-turbine steel towers, the prestressed concrete tower has better material damping properties, potential lower maintenance cost, and lower construction costs. Thus, the prestressed concrete wind-turbine tower could be an innovative engineering solution for multi-megawatt wind turbine towers, in particular those that are taller than 100 m.

      • Remark on Irreducible Nonnegative Matrices

        Ma,,In,Sook,Ma 호남수학회 1999 한국수학학술지 Vol.16 No.1

        In this paper, we prove some properties of irreducible nonnegative matrices.

      • KCI등재

        서어에서의 COMP 범주 분석

        마상영 한국서어서문학회 1998 스페인어문학 Vol.13 No.1

        En esta tesis hemos propuesto nuestras opiniones sobre las estructuras de las oraciones compueatas que todavi′a tienen sin solucio′n muchas caracteri′sticas sinta′ctico-sema′nticas. Las grama′ticas tradicional y funcional distinguen entre las oraciones nominales, las relatives y las interrogativas segu′n las funciones que desempen~an en la oracio′n materna. En la grama′tica generativa se ha detallado el ana′lisis de la categori′a COMP con los cambios de contenido, pero todavi′a no ha aparecido una solucio′n complete. En esta situacio′n, hemos optado la idea de la categrori′a COMP de Chomsky(1986) que consideramos relativamente ma′s refinada. La conjuncio′n que introduce la oracio′n nominal ocupa la posicio′n nuclear de COMP, mientras los relativos y los interrogativos se trasladan a la posicio′n Espec de COMP dejando sue huellas respectivas en su posicio′n originaria. Pero, la oracio′n relative de funcio′n adjetiva se caracteriza par [-C, -θ] y no requiere la inversion Verbo-Sujeto durante la relativizacio′n, mientras que la oracio′n interrogativa de funcio′n nominal tiene los rasgos [+C, +θ] y exige la inversio′n Verbo-Sujeto durante el proceso de interrogacio′n. Asi′ tales diferencias son relevantes coma se ve: a. Oracio′n nominal : SCOMP ⇒ [+C,+θ] Quiero [sc[c$quot;[c que] [SF te vayas]]]. b. Oracio′n relativa : SCOMP ⇒ [-C,-θ] Esa es la chica [sc a que] [c[cθ] [SF queri′a visitar]]]. c. Oracio′n interrogativa : SCOMP ⇒ [+C, +θ] No se′ [sc cua′l pluma [c$quot;[c Φ] [SF pro prefieres]]]. Para solucionar estos problemas, Emonds(1976) nos ha propuesto que $quot;que$quot;(that en ingle′s) es un tipo de preosicio′n oracional. Pero como hemos viato en esta tesis, su solucio′n no es perfecta y tambie′n provoca problemas teo′ricos. De acuerdo con J. M. Brucart (en prensa), hemos comprobado la validez del ana′lisis de la categori′a COMP de Chomsky(1986) criticando los problemas pendientes de las propuestas de varios lingu¨i′stas : Mari′a Luisa Rivero(1980), Susan Plann(1982), M. Sun~er(1986, 1991). Tambie′n hemos analizado las relaciones entre la misma categori′a y los rasgos sema′nticos del verbo principal, y sus caraceri′sticas sinta′ctico-sema′nticas en el discurso indirecto. Lo que se ha argumentado en esta tesis nos muestra que le conviene ma′s al espan~ol el ana′lisis de COMP de Chomsky(1986) que los otros parame′trioos. El contraejemplo aparente de la secuencia $lt;que+S-qu$gt; no deteriora las suposiaones universales sino que las apoya, lo que hemos comprobado mediante el ana′lisis discursivo en que se seleocionan a la vez dos categori′as COMP. Sin embargo, todavi′a no vemos soluaonadas las diferencias sinta′ctico-sema′nticas de los componentes de la categori′a COMP. En unas propuestas anteriores la parti′cula QUE se divide en dos categori′as(relativo y conjuncio′n) en Rivero(1981) y en otras se considera so′1o como la u′nica categori′a : complementante (o mejor dicho, conjuncio′n). Pero siguiendo a esta u′ltima opinio′n, nos quedan la cuestio′n de que la preposicio′n, en el caso de las construcciones relativas EN QUE, DE QUE, aparece sin complemento, lo que viola la generalidad de la preposicio′n : La preposicio′n requiere la presencia obligatoria de su complemento, y la de que en el caso de EN EL QUE, DEL QUE, ..., no aparece el nu′cleo nominal del SN asi′ que ocurre la violacip′n del principio X'. A pesar de estas diferencias claras, haste ahora se ha tratado de analizar la categori′a COMP con el mismo criterio sinta′ctico, lo que consideramos problema′tico y deberi′amos esforzarnos a crear otras propuestas nuevas ma′s detalladas y de gran credibilidad.

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