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김만석 한국문학교육학회 2003 문학교육학 Vol.12 No.-
The writer considered Joseon juvenile poetry in the juche ideology age that was in the <Basic Korean> from the second volume to the sixth volume. Poetic content of Joseon juvenile poetry in the textbook is that about <the honor to our chiuef magistrate with us, and grow in endless happiness>, composing about the chief magistrate is main subject of Juvenile Poetry. Most of poetic emotion of Joseon juvenile poetry in the juche ideology age is represented in <joy, delight>, less represented in <anger> and <sorrow>. Joseon juvenile poetry in the juche ideology age use brief nursery rhyme expression such as simile, arranging in a row, climax. And take the form of fixed form of verse. Putting all together, Joseon juvenile poetry of the juche ideology age in the textbook stands on political task that is to make children give their fealty to the chief magistrate. This is utilitarian poetry, for the purpose to cultivate <children's endless respect and admiration to dear the chief magistrate Kim Ilsung>(<Juvenile Literature>page 51).
Shi-cheng Wan,Qiao Huang,Jian Guan 국제구조공학회 2019 Steel and Composite Structures, An International J Vol.32 No.1
This study investigates the flexural behavior of steel-concrete composite beams strengthened with prestressed carbon fiber-reinforced polymer (CFRP) plates. An innovative mechanical anchorage system was developed. The components of the system can be easily assembled on site before applying a prestressing force, and removed from the structures after strengthening is completed. A total of seven steel-concrete composite specimens including four simply supported beams strengthened at the positive moment region and three continuous beams strengthened at the negative moment region were tested statically until failure. Experimental results showed that the use of prestressed CFRP plates enhanced the flexural capacity and reduced the mid-span deflection of the beams. Furthermore, by prestressing the CFRP laminates, the material was used more efficiently, and the crack resistance of the continuous composite specimens at the central support was significantly improved after strengthening. Overall, the anchorage system proved to be practical and feasible for the strengthening of steel-concrete composite beams. The theoretical analysis of ultimate bearing capacity is reported, and good agreement between analytical values and experimental results is achieved.
The Research of Slots Allocation on Bridge Mode
Shi Li-na,Wan Li-li,Jiang Bing 보안공학연구지원센터 2016 International Journal of Smart Home Vol.10 No.9
Air transport worldwide is growing much more rapidly than the current airport systems’ capacity. This creates somewhat of a crisis for modern commercial aviation. In order to reduce congestion and delays, slots and slots allocation concepts had been put on for many years, but as the most scarce resources, all airlines wish get much slots as possible, So bridge mode was applied by the most areas. We analyzed differences of the slots allocation between in the bridge mode and in the traditional mode, and studied the slots allocation algorithm considering the minimum total delay rate. This paper approved the slots allocation algorithm could reduce the total delay and increase the flights volume, and showed a practical significance.
Shi-lin Zhang,Gao-jian Wu,Xingguo Yang,Wan-hong Jiang,Jia-wen Zhou 대한토목학회 2018 KSCE JOURNAL OF CIVIL ENGINEERING Vol.22 No.8
The Particle Size Distribution (PSD) properties of dam granular material plays an important role in the construction process ofearth-rock dams, as it can affect the filling quality and structural safety. However, the conventional sieving method employed tocheck the PSD is labor-intensive, time-consuming and not highly accurate. In this study, a digital image-based identification methodis presented for the determination of the PSD of dam granular material, which mainly incorporates image acquisition technology, alarge database and a neural network. Digital Image Processing (DIP) technology is used to recognize the geometric size and gradingcurve of dam granular materials at a small scale, while statistical distribution models are used to determine the characteristicparameters of the grading curve and convert the graphical curve into mathematical variables. Furthermore, a large database and a BPneutral algorithm, which is improved using a genetic algorithm, are introduced as tools to reveal the implicit relationship between theDIP and sieving grading curves to correct the error of identification. A case study for the Changheba Hydropower Station is used toillustrate the implementation details of the presented method. The identification results demonstrate that the presented method canacquire and assess the gradation in spite of a degree of error, which can be decreased when more advanced DIP technologies areexplored, the amount of data in the database is increased, and a more optimized network algorithm is adopted.
Grid-Connected Dual Stator-Winding Induction Generator Wind Power System for Wide Wind Speed Ranges
Shi, Kai,Xu, Peifeng,Wan, Zengqiang,Bu, Feifei,Fang, Zhiming,Liu, Rongke,Zhao, Dean The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.4
This paper presents a grid-connected dual stator-winding induction generator (DWIG) wind power system suitable for wide wind speed ranges. The parallel connection via a unidirectional diode between dc buses of both stator-winding sides is employed in this DWIG system, which can output a high dc voltage over wide wind speed ranges. Grid-connected inverters (GCIs) do not require booster converters; hence, the efficiency of wind energy utilization increases, and the hardware topology and control strategy of GCIs are simplified. In view of the particularities of the parallel topology and the adopted generator control strategy, we propose a novel excitation-capacitor optimization solution to reduce the volume and weight of the static excitation controller. When this excitation-capacitor optimization is carried out, the maximum power tracking problem is also considered. All the problems are resolved with the combined control of the DWIG and GCI. Experimental results on the platform of a 37 kW/600 V prototype show that the proposed DWIG wind power system can output a constant dc voltage over wide rotor speed ranges for grid-connected operations and that the proposed excitation optimization scheme is effective.
Imaging x-ray crystal spectrometer on EAST
Shi, Yuejiang,Wang, Fudi,Wan, Baonian,Bitter, Manfred,Lee, Sanggon,Bak, Jungyo,Hill, Kennith,Fu, Jia,Li, Yingying,Zhang, Wei,Ti, Ang,Ling, Bili Published jointly by The Institute of Physics and 2010 Plasma physics and controlled fusion Vol.52 No.8
<P>A high-resolution imaging x-ray crystal spectrometer is described for implementation on the EAST tokamak to provide spatially and temporally resolved data on the ion temperature, electron temperature and poloidal plasma rotation. These data are derived from observations of the satellite spectra of helium-like argon, Ar XVII, which is the dominant charge state for electron temperatures in the range from 0.4 to 3.0 keV and which is accessible to EAST. Employing a novel design, which is based on the imaging properties of spherically bent crystals, the spectrometers will provide spectrally and spatially resolved images of the plasma for all experimental conditions, which include ohmically heated discharges as well as plasmas with rf and neutral-beam heating. The experimental setup and initial experimental results are presented.</P>
Dynamic Analysis of Three-Dimensional Drivetrain System of Wind Turbine
Shi, Wei,Park, Hyun-Chul,Na, Sangkwon,Song, Jinseop,Ma, Sangjin,Kim, Chang-Wan Korean Society for Precision Engineering 2014 International Journal of Precision Engineering and Vol.15 No.7
In our previous study, a torsional model was used to perform a dynamic analysis of a wind turbine drivetrain. However, detailed characteristics could not be obtained with this torsional model. In this paper, the mathematical model of the wind turbine drivetrain is extended to a three-dimensional dynamic model. A typical arrangement with one low-speed planetary gear stage and two high-speed spur gear stages is used in this work. The governing equation of the drivetrain is derived by using Lagrange's equation. Lagrange's equation takes into account the kinetic energy of each component and potential energies from the shaft, bearing, and gear mesh. The governing equation is solved numerically using direct numerical integration. A dynamic analysis is carried out to investigate the transient response of the drivetrain system.
Shi, Binghua,Su, Yixin,Zhang, Huajun,Liu, Jiawen,Wan, Lili The Society of Naval Architects of Korea 2019 International Journal of Naval Architecture and Oc Vol.11 No.1
The obstacles modeling is a fundamental and significant issue for path planning and automatic navigation of Unmanned Surface Vehicle (USV). In this study, we propose a novel obstacles modeling method based on high resolution satellite images. It involves two main steps: extraction of obstacle features and construction of convex hulls. To extract the obstacle features, a series of operations such as sea-land segmentation, obstacles details enhancement, and morphological transformations are applied. Furthermore, an efficient algorithm is proposed to mask the obstacles into convex hulls, which mainly includes the cluster analysis of obstacles area and the determination rules of edge points. Experimental results demonstrate that the models achieved by the proposed method and the manual have high similarity. As an application, the model is used to find the optimal path for USV. The study shows that the obstacles modeling method is feasible, and it can be applied to USV path planning.