• Proceedings of the KIPE Conference
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• 1997.07a
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• pp.152-155
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• 1997

This thesis proposed a speed control system for induction motors robust to variations in torque and parameters by feedforward compensating the current portion of load torque, adding a load torque observer to the conventional PI controller in the indirect vector controlled induction motor system. In conclusion, this thesis demonstrate the improved transient characteristic to variations in reference speed and load torque, compared to the conventional PI control method, by means of the feedworward control of the estimated load torque.

• Journal for History of Mathematics
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• v.19 no.1
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• pp.55-64
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• 2006

The thesis is about the development of mathematics starting from the old Greece and the old Babylonia. The modem mathematics has been developed, based on the set theory in the axiomatic method since the 19th century. The primary impetus of this thesis will be to summary the development of topology.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.10a
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• pp.89-92
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• 2000

The purpose of this thesis is to investigate the information content of commercial paper credit rating changes of Korean firms. The result shows neither sinificant daily abnormal returns nor significant cumulative daily abnormal returns over the test window. This ind icates that commercial paper rating changes are not informative to investors. A sensitivity analysis conducted for the portfolio of subsample shows a similar result. This thesis, however, may contribute to the better operation of Korean financial market by providing several directions to establish credit-based financial transactions.

• The Transactions of the Korean Institute of Electrical Engineers P
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• v.53 no.4
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• pp.161-165
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• 2004

This thesis proposes a robust controller introducing the $H_{\infty}$ control theory, one of the robust control theories that can obtain desired control performance while ensuring robustness for the uncertainty and disturbance contained in the power system. This thesis also proposes an improved digital exciter control system for a synchronized generator using a digitally designed controller. Simulation to verify the usefulness of the proposed method was carried. Results show that the proposed control system manifests excellent control performance compared to existing control systems.

• Proceedings of the KAIS Fall Conference
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• 2007.05a
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• pp.147-149
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• 2007

"Dynamic Neural Unit"(DNU) based upon the topology of a reverberating circuit in a neuronal pool of the central nervous system. In this thesis, we present a genetic DNU-control scheme for unknown nonlinear systems. Our methodis different from those using supervised learning algorithms, such as the backpropagation (BP) algorithm, that needs training information in each step. The contributions of this thesis are the new approach to constructing neural network architecture and its trainin.

• Proceedings of the IEEK Conference
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• 1998.06a
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• pp.803-806
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• 1998

This thesis proposes a new heuristic algorithm of integrated allocation and binding for high level synthesis. The proposed algorithm simultaneously allocates binds functional units, interconnections and registers by considering interdependency between operations and storage elements in each control step, in order to share registers and interconnections connected to functional units, as much as possible. This thesis shows the effectiveness of the algorithm by comparing the results of out experiments with those of existing system.

• International Commerce and Information Review
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• v.6 no.3
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• pp.19-40
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• 2004

The purpose of this paper is to analyze the present condition and business convergence of TV home shopping markets. This study is focused on the current situation and promotion plans of TV home shopping markets to make it better. This thesis shows the distribution characteristic and circumstances of korean distribution market and share of market. Using analysis data, the conclusion of thesis is that TV home shopping company will increase their business sector by appling T-commerce under the Ubiqutious era.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.325-326
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• 2008

The telecom world is steadily converging with the IP world, the benefits of converged services are required by many traditional telecom users. The aim of this thesis is to study the functional architecture of NGN based converged service. This thesis also shows how the converged service could be implemented on NGN with IMS core architecture.

• 제어로봇시스템학회:학술대회논문집
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• 1986.10a
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• pp.169-174
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• 1986

This thesis investigates the scanning time ; one of the most important performance index of Programmable Controller(PC). The multiprocessor architecture of the large PC considered in this thesis are classified as architecture 1 and architecture 2 by the bus control methods. The queuing model of each architecture is developed. Form the analysis it is observed that in the case of the number of processors less than 3 the best architecture of the large PC is the architecture 2 and in the case of the number of processors greater than 2 the best architecture of the large PC is the architecture 1.

• Proceedings of the IEEK Conference
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• 1999.06a
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• pp.1137-1140
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• 1999

In this thesis, we research about Communication System Construction and Test-Bed Realization Method and Software’s Design with written program into Embedded Micro Controller’s restricted memory region using a DSP Chip to deal with mainly high speed communication. Tools used for modern communication network control use TI or AMD general chip class, but nevertheless responsibility for the point at issue, Analog Device is architecture design model moderated for small communication system. In this thesis, we present extended model, and realize basic case.