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        • SCIESCOPUSKCI등재

          A reversible data hiding scheme in JPEG bitstreams using DCT coefficients truncation

          Zhang,,Mingming,Zhou,,Quan,Hu,,Yanlang Korean Society for Internet Information 2020 KSII Transactions on Internet and Information Syst Vol.14 No.1

          A reversible data hiding scheme in JPEG compressed bitstreams is proposed, which could avoid decoding failure and file expansion by means of removing of bitstreams corresponding to high frequency coefficients and embedding of secret data in file header as comment part. We decode original JPEG images to quantified 8×8 DCT blocks, and search for a high frequency as an optimal termination point, beyond which the coefficients are set to zero. These blocks are separated into two parts so that termination point in the latter part is slightly smaller to make the whole blocks available in substitution. Then spare space is reserved to insert secret data after comment marker so that data extraction is independent of recovery in receiver. Marked images can be displayed normally such that it is difficult to distinguish deviation by human eyes. Termination point is adaptive for variation in secret size. A secret size below 500 bits produces a negligible distortion and a PSNR of approximately 50 dB, while PSNR is also mostly larger than 30 dB for a secret size up to 25000 bits. The experimental results show that the proposed technique exhibits significant advantages in computational complexity and preservation of file size for small hiding capacity, compared to previous methods.

        • SCIESCOPUS

          A Novel High Speed Frequency Sweeping Signal Generator in X-band Based on Tunable Optoelectronic Oscillator

          Sun,,Mingming,Chen,,Han,Sun,,Xiaohan Optical Society of Korea 2018 Current optics and photonics Vol.2 No.1

          A novel X-band high speed frequency sweep signal generator based on a tunable optoelectronic oscillator (OEO) incorporating a frequency-swept laser is presented and the theoretical fundamentals of the design are explained. A prototype of the generator with tuning range from 8.8552 GHz to 10.3992 GHz and a fine step about 8 MHz is achieved. The generated radiofrequency signal with a single sideband (SSB) phase noise lower than -100 dBc/Hz@10KHz is experimentally demonstrated within the whole tunable range, without any narrow RF band-pass filters in the loop. And the tuning speed of the frequency sweep signal generator can reach to over 1 GHz/s benefiting from applying a novel dispersion compensation modular instead of several tens of kilometers of optical fiber delay line in the system.

        • SCIESCOPUSKCI등재

          An Induced Hesitant Linguistic Aggregation Operator and Its Application for Creating Fuzzy Ontology

          Kong,,Mingming,Ren,,Fangling,Park,,Doo-Soon,Hao,,Fei,Pei,,Zheng Korean Society for Internet Information 2018 KSII Transactions on Internet and Information Syst Vol.12 No.10

          An induced hesitant linguistic aggregation operator is investigated in the paper, in which, hesitant fuzzy linguistic evaluation values are associated with probabilistic information. To deal with these hesitant fuzzy linguistic information, an induced hesitant fuzzy linguistic probabilistic ordered weighted averaging (IHFLPOWA) operator is proposed, monotonicity, boundary and idempotency of IHFLPOWA are proved. Then andness, orness and the entropy of dispersion of IHFLPOWA are analyzed, which are used to characterize the weighting vector of the operator, these properties show that IHFLPOWA is extensions of the induced linguistic ordered weighted averaging operator and linguistic probabilistic aggregation operator. In this paper, IHFLPOWA is utilized to gather linguistic information and create fuzzy ontologies, and a movie fuzzy ontology as an illustrative case study is used to show the elaboration of the proposed method and comparison with the existing linguistic aggregation operators, it seems that the IHFLPOWA operator is an useful and alternative operator for dealing with hesitant fuzzy linguistic information with probabilistic information.

        • SCIESCOPUSKCI등재

          Kinetics of Horseradish Peroxidase-Catalyzed Nitration of Phenol in a Biphasic System

          Kong,,Mingming,Zhang,,Yang,Li,,Qida,Dong,,Runan,Gao,,Haijun The Korean Society for Microbiology and Biotechnol 2017 Journal of microbiology and biotechnology Vol.27 No.2

          The use of peroxidase in the nitration of phenols is gaining interest as compared with traditional chemical reactions. We investigated the kinetic characteristics of phenol nitration catalyzed by horseradish peroxidase (HRP) in an aqueous-organic biphasic system using n-butanol as the organic solvent and ${NO_2}^-$ and $H_2O_2$ as substrates. The reaction rate was mainly controlled by the reaction kinetics in the aqueous phase when appropriate agitation was used to enhance mass transfer in the biphasic system. The initial velocity of the reaction increased with increasing HRP concentration. Additionally, an increase in the substrate concentrations of phenol (0-2 mM in organic phase) or $H_2O_2$ (0-0.1 mM in aqueous phase) enhanced the nitration efficiency catalyzed by HRP. In contrast, high concentrations of organic solvent decreased the kinetic parameter $V_{max}/K_m$. No inhibition of enzyme activity was observed when the concentrations of phenol and $H_2O_2$ were at or below 10 mM and 0.1 mM, respectively. On the basis of the peroxidase catalytic mechanism, a double-substrate ping-pong kinetic model was established. The kinetic parameters were ${K_m}^{H_2O_2}=1.09mM$, ${K_m}^{PhOH}=9.45mM$, and $V_{max}=0.196mM/min$. The proposed model was well fit to the data obtained from additional independent experiments under the suggested optimal synthesis conditions. The kinetic model developed in this paper lays a foundation for further comprehensive study of enzymatic nitration kinetics.

        • SCIESCOPUSKCI등재

          Capacity Analysis of Centralized Cognitive Radio Networks for Best-effort Traffics

          Lin,,Mingming,Hong,,Xuemin,Xiong,,Jin,Xue,,Ke,Shi,,Jianghong Korean Society for Internet Information 2013 KSII Transactions on Internet and Information Syst Vol.7 No.9

          A centralized cognitive radio (CR) network is proposed and its system capacity is studied. The CR network is designed with power control and multi-user scheduling schemes to support best-effort traffics under peak interference power constraints. We provide an analytical framework to quantify its system capacity, taking into account various key factors such as interference constraints, density of primary users, cell radius, the number of CR users, and propagations effects. Furthermore, closed-form formulas are derived for its capacities when only path loss is considered in the channel model. Semi-analytical expressions for the capacities are also given when more realistic channel models that include path loss, shadowing, and small-scale fading are used. The accuracy of the proposed analytical framework is validated by Monte Carlo simulations. Illustrated with a practical example, the provided analytical framework is shown to be useful for the strategic planning of centralized CR networks.

        • SCIESCOPUSKCI등재후보

          Experimental study on high gravity dam strengthened with reinforcement for seismic resistance on shaking table

          Wang,,Mingming,Chen,,Jianyun,Fan,,Shuli,Lv,,Shaolan Techno-Press 2014 Structural Engineering and Mechanics, An Int'l Jou Vol.51 No.4

          In order to study the dynamic failure mechanism and aseismic measure for high concrete gravity dam under earthquake, the comparative models experiment on the shaking table was conducted to investigate the dynamic damage response of concrete gravity dam with and without the presence of reinforcement and evaluate the effectiveness of the strengthening measure. A new model concrete was proposed and applied for maintaining similitude with the prototype. A kind of extra fine wires as a substitute for rebar was embedded in four-points bending specimens of the model concrete to make of reinforced model concrete. The simulation of reinforcement concrete of the weak zones of high dam by the reinforced model concrete meets the similitude requirements. A tank filled with water is mounted at the upstream of the dam models to simulate the reservoir. The Peak Ground Acceleration (PGA) that induces the first tensile crack at the head of dam is applied as the basic index for estimating the overload capacity of high concrete dams. For the two model dams with and without strengthening tested, vulnerable parts of them are the necks near the crests. The results also indicate that the reinforcement is beneficial for improving the seismic-resistant capacity of the gravity dam.

        • Narrative Research of New media display design

          Zhang,Mingming,Wei,Yanyu 한중경제문화학회 2021 한중경제문화연구 Vol.16 No.-

          Purpose: To study the narrative characteristics and narrative strategies of new media display design. Method: By the way of introducing the related theories and concepts of narratology into the new media display design, combined with actual cases and literature, this paper summarizes the narrative elements, narrative characteristics and narrative structure of new media display design, and then explores the new media display design of new methods, new strategies. Conclusion: New media display makes use of information technology, digital technology, intelligent equipment and other cutting-edge scientific and technological achievements to create the space environment, of which narrative style is characterized by cross-media narration, dynamic narration and participatory narration. Narrative method can be started and designed with project planning and design from three aspects: establishing narrative key words, organizing reasonable narrative structure and selecting appropriate narrative media, so as to bring "story" deep memory and immersion experience to the audience.

        • SCOPUSKCI등재

          Capillary Electrochromatography with Liquid Crystal Crown Ether Modified Hybrid Silica Monolith for Analysis of Imidacloprid and Carbendazim in Tomatoes

          Wang,,Mingming,Feng,,Rui,Shen,,Jing,Chen,,Hao,Zeng,,Zhaorui Korean Chemical Society 2012 Bulletin of the Korean Chemical Society Vol.33 No.7

          This study describes the ability of capillary electrochromatography (CEC) for the determination of imidacloprid and carbendazim in tomato samples. A novel liquid crystal crown ether modified hybrid silica monolithic column was synthesized, characterized and developed as separation column for the first time. Baseline separation of imidacloprid and carbendazim could be achieved using a mobile phase containing 90% (v/v) 20 mmol/L phosphate buffer (pH 7.0) and 10% (v/v) acetonitrile. The matrix matched calibration curves were linear with correlation coefficient $r^2$ > 0.9998 in the range of 0.20-10.00 mg/L. The limits of detection for imidacloprid and carbendazim were 0.061 and 0.15 mg/kg, respectively, which were below the maximum residue limits established by the European Union as well as Codex Alimentarius. Average recoveries for imidacloprid and carbendazim varied from 101.6-108.0% with relative standard deviations lower than 6.3%. This method was applied to the analysis of tomatoes collected from local markets.

        • KCI등재SCOPUS

          Periparturient stocking density affects lying and ruminating behavior and one-week-calf performance of Holstein cows

          Jiang,Mingming,Alugongo,Gibson,Maswayi,Xiao,Jianxin,Li,Congcong,Ma,Yulin,Li,Tingting,Cao,Zhijun,Liu,Dasen 아세아·태평양축산학회 2021 Animal Bioscience Vol.34 No.4

          Objective: This study aimed to investigate the effect of stocking density on the behavior, productivity, and metabolism of periparturient Holstein cows as well as calf performance. Methods: A total of 48 periparturient cows were randomly assigned into three groups at 28 days (±3 days) before their expected calving date. The stocking densities of the groups, relative to the standard cubicle and feed bunk number, were i) 80% (13 cows), ii) 100% (16 cows), and iii) 120% (19 cows). Lying and rumination behavior was recorded using electronic data loggers and HR-Tags from d -21 (“d-” means days before calving) until the calving date, d 0. Lying time was assessed to determine the diurnal total hours spent lying per day. Rumination time was averaged in 2 hours interval periods over 24 hours during the experimental period. Results: Cows in the 80% group spent more time lying and ruminating between d -21 and d -7 and tended to ruminate more between d -14 and d 0. Calcium levels tended to be higher for cows in the 80% group, no other observable differences were found in monitored blood parameters. Moreover, 3.5% fat corrected milk and energy corrected milk yields were higher in 80% group in the first month of lactation. No other observable differences were found in the yield and composition of colostrum and milk in the first 10 months of lactation. The growth and performance of calves in the first week of life was not affected by stocking density of the dams. Conclusion: We concluded that lower stocking density may increase lying and ruminating behavior of prepartum Holstein cows. However, this did not translate into improved productivity and metabolism. Objective: This study aimed to investigate the effect of stocking density on the behavior, productivity, and metabolism of periparturient Holstein cows as well as calf performance.Methods: A total of 48 periparturient cows were randomly assigned into three groups at 28 days (±3 days) before their expected calving date. The stocking densities of the groups, relative to the standard cubicle and feed bunk number, were i) 80% (13 cows), ii) 100% (16 cows), and iii) 120% (19 cows). Lying and rumination behavior was recorded using electronic data loggers and HR-Tags from d -21 (“d-” means days before calving) until the calving date, d 0. Lying time was assessed to determine the diurnal total hours spent lying per day. Rumination time was averaged in 2 hours interval periods over 24 hours during the experimental period.Results: Cows in the 80% group spent more time lying and ruminating between d -21 and d -7 and tended to ruminate more between d -14 and d 0. Calcium levels tended to be higher for cows in the 80% group, no other observable differences were found in monitored blood parameters. Moreover, 3.5% fat corrected milk and energy corrected milk yields were higher in 80% group in the first month of lactation. No other observable differences were found in the yield and composition of colostrum and milk in the first 10 months of lactation. The growth and performance of calves in the first week of life was not affected by stocking density of the dams.Conclusion: We concluded that lower stocking density may increase lying and ruminating behavior of prepartum Holstein cows. However, this did not translate into improved productivity and metabolism.

        • KCI등재SCOPUS

          Performance Testing and Comparison of Buckling-restrained Braces with H and Crisscross Cross Section Unrestrained Segments

          Mingming,Jia,Lanhui,Guo,Dagang,Lu 한국강구조학회 2014 International Journal of Steel Structures Vol.14 No.4

          Buckling-restrained braces (BRBs) deliver ductile, stable, and repeatable hysteretic behavior. The plastic deformationcapacity of the BRBs indicates the good indexes both in terms of ultimate deformation and in terms of energy dissipationcapacity. In this paper, the load-carrying elements of BRBs were fabricated with steel (Chinese Q235), and four layers of plasticfilm (0.2 mm in thickness) were used as unbounded materials to prevent the buckling of inner cores in higher modes andprovide spaces to facilitate its lateral expansion in case of compression. The differences of ultimate compression and tensionloads were controlled in a small range. The transformation of the unrestrained segment's section from crisscross shape to Hshape can significantly improve the moment-resistance capacity of the unrestrained segment, avoiding buckling instabilityeffectively due to evident moment stiffness enhancement. The experimental results of pseudo-static tests (PSTs) under cyclicload indicate: BRB with H cross section unrestrained segments can undergo fully-reversed axial yield cycles without loss ofstiffness or strength, which have large ductility and superior seismic energy dissipation ability. There is obvious strainintensification in tension and compression phases. But there is evident decreasing of stiffness and strength on BRB withcrisscross section unrestrained segments due to the buckling of unrestrained segment under compression, the ductility andenergy dissipation ability decline distinctly.

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