• Journal of Industrial Technology
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• v.28 no.B
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• pp.15-25
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• 2008

This paper is to develop a network reorganization method to consider the constraints which are turn restrictions, U-turns, and P-turns in two way traffic network for Intelligent Transport System(ITS). Several kinds of traffic constraints can be represented in reorganized network using virtual nodes and arc values. The evolution program is also developed to search the multiple shortest paths in this reorganized traffic network within limited time.

• Journal of the Korean Home Economics Association
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• v.40 no.6
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• pp.213-221
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• 2002

This study investigated talk about mental states in pretend play, to whom mental states were attributed, and function of mental-state terms. Also, frequency of mental-state terms of pretend versus non-pretend turns was examined. Thirty 4 year old preschoolers, each paired with a self-chosen peer, were observed and videotaped during a 20-minute play session. The observations presented the following conclusions: Knowing and pretending were the most frequently expressed. Children attributed a large proportion of mental state to themselves. The mental-state terms were used to refer his or another's thoughts and beliefs, to direct interaction, and to attract the other child's attention. Mental-state talk occurred within pretend more often than within non-pretend turns.

• 전기의세계
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• v.24 no.4
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• pp.73-76
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• 1975

In this study, a design scheme of an impulsive high current generating device is presented. The device is proved to be effective in producing rather complex type of the permanent magnet. Principally, the apparatus designed same to the ordinary potential transformer or current transformer, but, it has a certain differences that the primary winding of many turns is excited by d.c. source and the secondary winding of a few turns induce low voltage and high current at the instant when opening a switch in the primary circuit. This paper does not include magnet production process. Rather, it deals with the analytical studies of the devices, the designing procedure of the experimental setup, and some results from the experimental data are presented as a preliminary study. The experimental results are found to agree well with the theoritical analysis presented in this paper.

• The Transactions of the Korean Institute of Electrical Engineers A
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• v.53 no.7
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• pp.375-381
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• 2004

This paper describes a three-winding transformer protective relaying algorithm based on the ratio of increments of flux linkages (RIFL). To minimize the approximation errors, the algorithm uses integration approximation. The RIFL of the two windings is equal to the turns ratio for all operating conditions except for an internal fault. For a single-phase and three-phase transformer containing the wye-connected windings, the increments of flux linkages (IFL) are calculated. For a three-phase transformer containing the delta-connected windings, the difference of IFL between the two phases are calculated to use the line currents, because the winding currents are practically unavailable. Their ratios are compared with the turns ratio. The comparative study between the proposed and differential approximation methods was conducted. The test results show that the algorithm can reduce the errors resulting from the conventional methods.

• JSTS:Journal of Semiconductor Technology and Science
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• v.7 no.2
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• pp.102-109
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• 2007

We propose and experimentally demonstrate a ring resonator with sharp U-turns fabricated on a silicon-on-insulator (SOI) substrate; the resonator was designed as a key part of an optical, dynamic data storage device. We discuss the optical properties of the fabricated ring resonator from the viewpoint of equi-frequency-contour behavior in a dispersion space. We successfully characterize its optical characteristics on the basis of photonic crystal physics. It is suggested that the photonic ring resonator will be applicable to optical, dynamic memory devices for optical communication systems.

• Journal for History of Mathematics
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• v.29 no.4
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• pp.219-232
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• 2016

In this paper, the problem posed in Yeonhwando is presumed like the following: "Make the sum of eight numbers in each 13 octagons to be 292, and the sum of four numbers in each 12 squares to be 146 using every numbers once from 1 to 72." Regarding this problem, in this paper, firstly, it is commented that there can be a lot of derived solutions from the Yang Hui's solution. Secondly, the Yang Hui's solution is generalized by using sequence 1 in which the sum of neighbouring two numbers are 73, 73-x by turns, and sequence 2 in which the sum of neighbouring two numbers are 73, 73+x by turns. Thirdly, the Yang Hui's solution is generalized by using the alternating method.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.59 no.10
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• pp.1882-1888
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• 2010

It is widely known that ESA(Electric Signature Analysis) method is very useful one for fault diagnosis of an induction motor. Online fault diagnosis system of induction motors using LabVIEW is proposed to detect the fault of broken rotor bars and shorted turns in stator. This system is not model-based system of induction motor but LabVIEW-based fault diagnosis system using FFT spectrum of stator current in faulty motor without estimating of motor parameters. FFT of stator current in faulty induction motor is measured and compared with various reference fault data in data base to diagnose the fault. This paper is focused on to predict and diagnose of the health state of induction motors in steady state. Also, it can be given to motor operator and maintenance team in order to enhance an availability and maintainability of induction motors. Experimental results are demonstrated that the proposed system is very useful to diagnose the fault and to implement the predictive maintenance of induction motors.

• Journal of the Korean Home Economics Association
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• v.45 no.8
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• pp.77-89
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• 2007

The purpose of this study was to investigate early childhood teachers' self-image by metaphoric pictures of occupation. The sample consisted of 311 early childhood teachers in kindergarten or day-care center. Teachers were asked them to match their image of themselves as early childhood teachers with metaphoric pictures of occupation. The major results were as follows. First, kindergarten teachers chose conductor, entertainer, nurse, sculptor, shopkeeper, animal trainer, judge by turns and day-care center teachers chose nurse, sculptor, conductor, entertainer, shopkeeper, judge, animal trainer by turns. Second, the reason for selecting the metaphoric pictures of occupation as their self-image was analyzed into 16 categories.

• Journal of Advanced Marine Engineering and Technology
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• v.38 no.10
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• pp.1269-1274
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• 2014

Due to the presence of Dean flow in curved ducts, helical channels have drawn attention recently because of the practical industrial applications. The manipulation of fluids through microfluidic devices is widely used in many scientific and industrial areas. In the present study, numerical simulations were performed on a helical microchannel to predict the impact of different design parameters that affect Dean flow. Important geometric parameters such as the channel cross section, pitch, radius of curvature, and number of turns were considered for the analysis. The study also incorporates the effect of varying flow rate on Dean flows. It was found from the simulation results that microchannel cross section and pitch have a significant impact on maintaining the Dean flow, compared to the radius of curvature, number of turns, and flow rate.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.92-92
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• 2000

Helicopter offer the signigicant advantage over traditional air vehicles, in that the provide extended maneuverability, such as vertical climb, hovering, longitudinal and lateral flight, hovering turns and bank turns. But helicopter have the strong cross couplings and nonlinearities for each lateral, longitudinal and rotational motion mutually. However, it is possible to ignore this couplings for the hovering condition, so using this properties we can control the attitude of helicopter. That is, by implementing the dynamic of each rotational axis(roll, pitch, yaw) of independent mutually, 3-DOF(degree of Freedom) attitude control for the helicopter is possible. In this paper, we identify decoupled input-coutput relations of each three rotational axis about the helicopter mounted on the 3-DOF gimbal by experiment, and on these basis implement 3-DOF attitude controller using the PID control method.