• Proceedings of the IEEK Conference
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• 1998.10a
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• pp.719-722
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• 1998

Fault simulation for large and complex sequential circuits is highly cpu-intensive task in the intergrated circuit design process. In this paper, we propose CM-SIM, a concurrent fault simulator which employs an optimal memory management strategy and simple list operations. CM-SIM removes inefficiencies and uses new dynamic memory management strategies, using contiguous array memory. Consequently, we got improved performance and reduced memory usage in concurrent fault simulation.

• Journal of the Microelectronics and Packaging Society
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• v.7 no.4
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• pp.17-22
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• 2000

In this paper, methods to analyze wire sweep during the semiconductor chip encapsulation have been studied. The wire sweep analysis is used to analyze the deformation of bonding wires that connect the chip to the leadframe during encapsulation. The analysis is done using either analytical solutions or numerical simulation. The analytical solution is used for rough but fast calculation of wire sweep. The results from the numerical simulation are closest to the experimental results.

• JSTS:Journal of Semiconductor Technology and Science
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• v.10 no.4
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• pp.292-299
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• 2010

With scaled technology, timing analysis of circuits becomes more and more difficult. In this paper, we review recently developed circuit simulation techniques created to deal with the cost issues of transistor-level simulations. Various techniques for fast SPICE simulations and Monte Carlo simulations are introduced. Moreover, process and aging variation issues are mentioned, along with promising methodologies.

• Journal of the Korean Magnetic Resonance Society
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• v.10 no.1
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• pp.1-37
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• 2006

General expressions for solid state NMR lines are described for transitions under static, magic angle spinning, and variable angle spinning conditions in the case where the principal axis system for the anisotropic chemical shift tensor is noncoincident with that of the quadrupole coupling tensor. It is demonstrated that solid state NMR powder pattern simulation program VMAS based on the conventional grid point method of integrating over the Euler angle space is fast enough in comparison with the POWDER simulation package and Gauss-point method.

• Proceedings of the KIPE Conference
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• 2000.07a
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• pp.421-424
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• 2000

Direct Torque Control(DTC) of AC motor has the fast torque and flux dynamic responses even though it has very simple scheme to implement. However DTC do not show good performance at low speed range with conventional open loop stator flux observer when stator resistance varied. So authors proposed nonlinear stator flux obsever in order to flux estimation at low speed and show its simulation results.

• Journal of the Korea Society of Computer and Information
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• v.3 no.2
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• pp.155-160
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• 1998

We applied a pilot symbol assisted modulation technique to QPSK system for improving BER performance over mobile communication channel. We demonstrate through computer simulation, that the proposed scheme achieves a prominent improvement comparison to that of conventional QPSK in a fast flat Rayleigh fading environment.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.809-813
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• 2006

We have studied the optical properties of the biaxial film such as fast axis, retardance and the change of polarization state between crossed polarizer using dual rotating retarder polarimeter. We have developed a novel simulation model, which could explain well the experimental results, and found that it could be used to optimize the compensation film in LCD for improving wide-viewing property.

• Proceedings of the IEEK Conference
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• 2003.07a
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• pp.210-213
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• 2003

This paper presents a beamforming algorithm for the uplink application of a linear array antenna for WCDMA system. A steering beamforming algorithm is designed using a block DFT algorithm and its performance is analyzed and verified using computer simulations. Various environmental parameters such as the number of antenna elements, the number of users, the mobility of the target user, and the status of fast power control are reflected in the simulation study providing themselves as useful design and implementation guides for the reverse link beamforming of WCDMA system.

• Publications of The Korean Astronomical Society
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• v.2 no.1
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• pp.13-20
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• 1985

Magnetic reconnect ion is studied numerically by means of a two dimensional MHD code. The initial magnetic field configuration is the two-dimensional dipole field, and the simulation model involves magnetic reconnect ion driven by the magnetized plasma flow. Strong plasma jetting, plasmoid formation and its fast ejection are observed in the downstream region. The dependence of reconnection rate on the incoming energy flux is found to be very sensitive, while the magnitude of the resistivity does not influence much on the reconnection rate. The simulation results are discussed in the context of the geomagnetic substorm.

• Proceedings of the KIEE Conference
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• 1999.11b
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• pp.226-228
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• 1999

This paper presents a dynamic simulation algorithm for studying the effect of Unified Power Flow Controller(UPFC) on the low frequency power system oscillations and transient stability studies. The algorithm is a Newton-type one and gives a fast convergence characteristics. The algorithm is applied to inter-area power oscillation damping regulator design of a sample two-area power system. The results show that UPFC is very effective for damping inter-area oscillations.