• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.145-148
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• 2000

이 논문에서는 2차원 얼굴 좌표데이터를 합성하기 위한 음성과 영상 동기화 알고리즘을 제안한다. 영상변수의 획득을 위해 화자의 얼굴에 부착된 표시를 추적함으로써 영상변수를 획득하였고, 음소정보뿐만 아니라 운율정보들과의 영상과의 상관관계를 분석하였으며 합성단위로 시각소에 기반한 코퍼스를 선택하고, 주변의 음운환경도 함께 고려하여 연음현상을 모델링하였다. 입력된 코퍼스에 해당되는 패턴들을 lookup table에서 선택하여 주변음소에 대해 기준패턴과의 음운거리를 계산하고 음성파일에서 운율정보들을 추출해 운율거리를 계산한 후 가중치를 주어 패턴과의 거리를 얻는다. 이중가장 근접한 다섯개의 패턴들의 연결부분에 대해 Viterbi Search를 수행하여 최적의 경로를 선택하고 주성분분석된 영상정보를 복구하고 시간정보를 조절한다.

• International Journal of Automotive Technology
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• v.1 no.1
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• pp.48-55
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• 2000

Two major roles of the traction control system (TCS) are to guarantee the acceleration performance and directional stability even in extreme road conditions, under which average drivers may not control the car properly. Commercial TCSs use experiential methods such as lookup table and gain-scheduling to achieve proper performance under various road and vehicle conditions. This paper proposes a new slip controller which uses the brake and the throttle actuator simultaneously. To avoid measurement problems and to get a simple structure, the brake controller and the throttle controller are designed using Lyapunov redesign method and multiple sliding mode control respectively. Through the hybrid use of brake and throttle controllers, the vehicle is insensitive to the variation of the vehicle mass, brake gain and road condition and can achieve the required acceleration performance. The proposed method is validated with simulations based on 15 DOF passenger car model.

• Journal of Power Electronics
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• v.11 no.2
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• pp.211-217
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• 2011

The dynamic response of a multi-MW wind turbine to a sudden change in wind speed is usually slow, because of the slow pitch control system. This could cause a large excursion of the rotor speed and an output power over the rated. A feedforward pitch control can be applied to minimize the fluctuations of these parameters. This paper introduces the complete design steps for a feedforward pitch controller, which consist of three stages, i.e. the aerodynamic torque estimation, the 3-dimensional lookup table for the wind seed estimation, and the calculation of the feedforward pitch amount. The effectiveness of the feedforward control is verified through numerical simulations of a multi-MW wind turbine.

• Korean Journal of Cognitive Science
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• v.4 no.2
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• pp.115-143
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• 1994

In this paper,I present an extended two-level model using LR parsing techniques.The LR-based two-level model not only guarantees effcient morphological processing but also achieves a higher degree of descriptive adequacy than Koskenniemi's original model.The two-level model is augmented with an independent morphosyntactic module based on feature-based CF word grammar.By adopting a CF word grammar,our model is capable of dealing with complex words with discontinuous dependencies without having duplicate lexicons.It is shown how LR predictions manifested in the parsing table can help the morphological processor to minimize the dictionary lookup process.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.361-364
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• 2006

Elliptic Curve Cryptosystem (ECC)은 작은 키 크기로 인하여 스마트카드, 센서 모트와 같은 메모리, 컴퓨팅 능력이 제약된 디바이스에서 사용하기에 적합하다. 본 논문에서는 이러한 디바이스에서 타원 곡선 서명 알고리즘 (ECDSA) 검증(Verification)의 주된 계산인 멀티 스칼라 곱셈을(multi-scalar multiplication) 효율적으로 구현하기 위한 알고리즘을 제안한다. 제안 알고리즘은 어떠한 메모리 크기에서도 적용 가능할 뿐만 아니라 해당 메모리 크기에서 최적의 효율성을 제공한다. 또한 스칼라 리코딩 (Scalar receding) 과정이 table lookup을 사용하지 않고 on-the-fly 하게 진행되기 때문에 기존의 다른 알고리즘에 비하여 더욱 메모리를 절약할 수 있다. 실험을 통하여 제안 알고리즘의 성능을 메모리 사용량, 효율성 측면에서 분석한다.

• ETRI Journal
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• v.32 no.5
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• pp.761-765
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• 2010

In this paper, we introduce an improved adaptive boosting (AdaBoost) classifier and its application, a disguised-face discriminator that discriminates between bare and disguised faces. The proposed classifier is based on an AdaBoost learning algorithm and regression technique. In the process, the lookup table of AdaBoost learning is utilized. The proposed method is verified on the captured images under several real environments. Experimental results and analysis show the proposed method has a higher and faster performance than other well-known methods.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.6
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• pp.1123-1129
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• 2009

The main goal of this paper is to simulate a Doubly-Fed Induction Generator (DFIG), which is similar to a real system. Wind velocity data is applied to a 2D Lookup table as a speed reference for a turbine model. A real electric machine's parameters are put in the simulator to get some results of the real system. The Matlab have been generally used to simulate DFIG, but it has some differences from the real system and is difficult to implement. A Simplorer simulator, however, simplifies DFIG simulation. The turbine is directly connected with the DFIG to be close to the real system. The machine's rotor is excited and controlled by the discrete carrier modulated matrix converter. It is possible to retrieve important information, like a generated power and wind quality etc., from the simulator without a huge wind turbine.

• Transactions of the Korean Society of Automotive Engineers
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• v.11 no.3
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• pp.214-219
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• 2003

This paper includes real-time tractive force estimation method using standard vehicle sensors such as wheel speed, brake pressure, throttle position, engine speed, and transmission carrier speed sensor. Engine map, torque converter lookup table, shaft torque observer, and brake gain adaptation method are used to estimate the tractive force. To verify this estimator, measurement which uses strain-based brake torque sensor and estimation results are presented. All results was performed using a real vehicle in a real-time.

• Proceedings of the KIEE Conference
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• 1987.07b
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• pp.1195-1198
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• 1987

This paper develops algorithms of element generation, addition, multiplication and inversion based on GF($2^m$). Since these algorithms are implemented by general purpose computer, these are more efficient than the conventional algorithms(Table Lookup, Euclid's Algorithm) in each operation. It is also implied that they can be applied to not only the normally defined elements but the arbitrarily defined ones for constructing multi-valued logic function.

• ETRI Journal
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• v.34 no.4
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• pp.637-640
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• 2012

The Davey-MacKay construction is a promising concatenated coding scheme involving an outer $2^k$-ary code and an inner code of rate k/n, for insertion-deletion-substitution channels. Recently, a lookup table (LUT)-based inner decoder for this coding scheme was proposed to reduce the computational complexity of the inner decoder, albeit at the expense of a slight degradation in word error rate (WER) performance. In this letter, we show that negligible deterioration in WER performance can be achieved with an LUT as small as $7{\cdot}2^{k+n-1}$, but no smaller, when the probability of receiving less than n-1 or greater than n+1 bits corresponding to one outer code symbol is at least an order of magnitude smaller than the WER when no LUT is used.