• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.1383-1386
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• 1997

Discrete cosine transform(DCT) is the most popular block transform coding in lossy mode. DCT is close to statistically optimal transform-the Karhunen Loeve transform. In this paper, a module for DCT encoder is made with TMS320C80 based on JPEG and MPEG, which are intermational standards for image compression. the DCT encoder consists of three parts-a transformer, a vector quantizer and an entropy encoder.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2005년도 추계종합학술대회
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• pp.687-690
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• 2005

H.264/AVC에서 압축 효율을 향상시키기 위해 사용된 entropy coding중에 CABAC(Context-based Adaptive Binary Arithmetic Coding)은 하드웨어 복잡도가 높고 bit-serial 과정에서 data dependancy가 존재하기 때문에 빠른 연산이 어렵다. 본 논문에서는 adaptive arithmetic encoder와 정규화 과정을 효율적으로 구성하여 각 입력 심벌이 정규화 과정의 반복횟수에 관계없이 고정된 cycle에 encoding이 되도록 하였다. 제안한 구조는 pipeline으로 구성하기 용이하며, 이 경우 매 cycle에 한 입력 심벌의 encoding이 가능하다.

• 한국정보과학회 언어공학연구회:학술대회논문집(한글 및 한국어 정보처리)
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• 한국정보과학회언어공학연구회 2017년도 제29회 한글 및 한국어 정보처리 학술대회
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• pp.167-171
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• 2017

자연어 생성은 특정한 조건들을 만족하는 문장을 생성하는 연구로, 이러한 조건들은 주로 표와 같은 축약되고 구조화된 의미 표현으로 주어지며 사용자가 자연어로 생성된 문장을 받아야 하는 어떤 분야에서든 응용이 가능하다. 본 논문에서는 SC(Semantically Conditioned)-GRU기반 encoder-decoder모델을 이용한 자연어 생성 모델을 제안한다. 본 논문에서 제안한 모델이 SF Hotel 데이터에서는 0.8645 BLEU의 성능을, SF Restaurant 데이터에서는 0.7570 BLEU의 성능을 보였다.

• 한국어정보학회:학술대회논문집
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• 한국어정보학회 2017년도 제29회 한글및한국어정보처리학술대회
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• pp.167-171
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• 2017

자연어 생성은 특정한 조건들을 만족하는 문장을 생성하는 연구로, 이러한 조건들은 주로 표와 같은 축약되고 구조화된 의미 표현으로 주어지며 사용자가 자연어로 생성된 문장을 받아야 하는 어떤 분야에서든 응용이 가능하다. 본 논문에서는 SC(Semantically Conditioned)-GRU기반 encoder-decoder모델을 이용한 자연어 생성 모델을 제안한다. 본 논문에서 제안한 모델이 SF Hotel 데이터에서는 0.8645 BLEU의 성능을, SF Restaurant 데이터에서는 0.7570 BLEU의 성능을 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 전문대학교육위원
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• pp.116-119
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• 2004

In this paper, a novel encoder of digital and analog hybrid type is proposed. It is shown that from this experiment a high-resolution angle measurement device can be designed by a low cost incremental encoder.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 1999년도 추계종합학술대회 논문집
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• pp.491-494
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• 1999

Introduction of digital communication network such as Integrated Services Digital Networks(ISDN) and digital storage media have rapidly developed. Due to a large amount of image data, compression is the key techniques in still image and video using digital signal processing for transmitting and storing. Digital image compression provides solutions for various image applications that represent digital image requiring a large amount of data. In this paper, the proposed DWT(Discrete Wavelet Transform) filter bank is consisted of simple architecture, but it is efficiently designed that a user obtain a wanted compression rate as only input parameter. If it is implemented by FPGA chip, the designed encoder operates in 12MHz.

• Journal of the Optical Society of Korea
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• 제9권3호
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• pp.95-98
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• 2005

We propose a two-dimensional temporal/wavelength optical code division multiple access (OCDMA) encoder/decoder, which has an array of superstructured fiber Bragg gratings (SSFBGs). SSFBGs in an encoder/decoder have different wavelengths from each other and can be coded with the same OCDMA code or not. Simulation was performed to analyze the feasibility of the scheme.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.241-244
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• 1997

A dead reckoning navigation system is developed for autonomous mobile robot localization. The navigation system was implemented by novel sensor fusion using a Kalman filter. A differential encoder and the gyroscope error models are developed for the filter. An indirect Kalman filter scheme is adopted to reduce the computational burden and to enhance the navigation system reliability. The filter mutually compensates the encoder errors and the gyroscope errors. The experimental results show that the proposed mobile . robot navigation algorithm provides the reliable position and heading angle of the mobile robot without any help of the external positioning systems.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1997년도 한국자동제어학술회의논문집; 한국전력공사 서울연수원; 17-18 Oct. 1997
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• pp.544-547
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• 1997

In this paper, we propose a dynamic localization method using a rotating sonar and a map. The proposed method is implemented by using extended Kalman filter. The state equation is based on the encoder propagation model and the encoder error model, and the measurement equation is a map-based measurement equation using a rotating sonar sensor. By utilizing sonar beam characteristics, map-based measurements are updated while AMR is moving continuously. By modeling and estimating systematic errors of a differential encoder, the position is successfully estimated even the interval of the map-based measurement. Monte-Carlo simulation shows that the proposed global position estimator has the performance of a few millimeter order in position error and of a few tenth degrees in heading error and of compensating systematic errors of the differential encoder well.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.1216-1219
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• 2003

The position control is very important in semiconductor manufacturing devices, precision machining tools, precision measuring instruments, etc. The accuracy of measurement for the distance in these devices affect on the performance of the whole devices. Therefore, in those precision instruments, a sensing device that can measure the distance of movement with high-precision resolution is required. In this paper, a novel hybrid (digital and analog) type encoder is proposed. It is shown that from several experiments, a high-resolution angular position measurement device can be designed with a low cost incremental encoder and a DSP controller.