선박용 디젤기관의 연구개발 동향

최갑석 대한기계학회 1989 大韓機械學會誌 Vol.29 No.6

국내 선박용 원동기연구는 1980년대에 들어서면서부터 엔진의 성능시험평가, 요소 기술개발연구, 소형엔진의 성능개량연구 등이 연구인력확보, 연구시설 확충 및 연구기반 구축과 병행하여 진행 되고 있다. 중. 대형엔진공장을 유치하여 생산공급하기도 급급했던 초기단계에서 수요확보를 위한 노력이 절실히 요망되었고, 또 부품 국산화, 수요자 요구에 부응키 위한 자체 능력향상은 가공생 산기술축적, 설계능력향상, 수리전문 기술자 및 AS등으로 도모되어 왔다. 외국 기술도입에 의한 생산의 장점-기술도입자체 외에도 세계적인 서비스 네트워크, 상표사용, 새로운 기술의 확보 등은 한국형 엔진 개발을 위한 연구를 도외시해 왔다. 한편 소형엔진에서는 어선 근대화 사업, 어민들 의 엔진성능인식이 상향됨으로써 새로운 고성능 엔진개발이 1980년대에 활발하게 진행되어 상당 한 진전을 보여 왔으며 고속엔진개발이나 대체에너지 이용 엔진개발에도 연구가 확대되고 있다. 본 글에서는 국내 박용 원동기 연구개발동향을 소개하기 위하여 국내 박용디젤엔진 산업과 연구 배경, 개발연구 등에 대한 내용을 실적 및 진행중인 과제를 위주로 요약 소개하고자 한다.

교류 누설전류 및 가변과부하 전류 차단기의 게이트 제어 회로에 관한 연구

崔甲石,房萬源 명지대학교 1978 明大論文集 Vol.11 No.-

본 논문은 교류 누설전류 차단 기능과 가변과부하전류 차단기능을 갖는 게이트 제어회로를 고찰하였다. 교류100〔V〕에서 500〔μA〕의 누설전류가 발생하는 경우와 설정전류의 1.2배에서 과전류 발생시 교류반도체 차단기를 동작시키는 우수한 특성을 가진 게이트 제어 회로를 설계하였으며 실험결과 누설전류가 500〔μA〕이하에서도 차단이 가능한 것으로 나타났다. This paper describes the gate control circuit of AC leakage current and variable overload current breaker. There is a discussion on the gate control circuit design of AC semiconductor circuit breaker, when AC 100(V) 500(μA) leakage current and 1.2 setpoint current generation for make cutoff circuit. Experimental results less than 500(μA) leakage current possible cutoff of circuit.

한국어 연속 숫자음 인식 시스템 구성

최갑석,배철수,이기영,유원욱 명지대학교 대학원 1989 明知大學校開校四十周年記念論文集 Vol.1989 No.-

In this paper, the recognition system of the Korean connected digits is constructed by the combination of the isolated-word recognition hardware and the auxilliary hardware interfaced with the host computer. The method of segmentation which is noticed to the fact that the Korean digit is a syllable and has a simillar length, is accomplished by extending error area to the both sides of segment's edges so that they have less difficulty due to the effects of coarticulation. As the experimental results through this system for 3-unit connected digits, 86.2% of the recognition rate is achieved.

LMS Pisarenko Harmonic Decomposition에 의한 배경뇌파 파워 스펙트럼 추정

鄭明眞,崔甲石 明知大學校 産業技術硏究所 1987 産業技術硏究所論文集 Vol.6 No.2

In this paper, the power spectrum of background EEG is estimated by the Pisarenko Harmonic decomposition based on Least Mean Square. At the power spectral estimation, the stochastic process of background EEg is assumed to consist of the nonharmonic sinusoil and the white noise. The optimal order of this model is the 6-th order when the eigenvalue' fluctuation of autocorrlation of background EEG is considered. The estimation results are compared with the results from the Maximum Entropy Spectral Estimation and the Pisarenko Hamonic Decomposition. From the comparison results, this method is possible to estimate the power spectrum of background EEG.

한글單母音 認識에 關한 硏究

金 哲,崔容燁,崔甲石 明知大學校 産業技術硏究所 1986 産業技術硏究所論文集 Vol.5 No.-

In this paper, a speech processing system is designed for recognition of isolated Han-Gul vowel, spoken by a designated talker and the recognition of 6 isolated Han-Gul vowels, really spoken by one man (26 ages) is implemented experimentally. A reference pattern for each vowel is stored as a time pattern of 10 order linear prediction coefficients (LPC) estimated by linear prediction coding. Log Likelihood Ratio distance is applied for a calculation of distance between and input pattern to be recognized and a reference pattern. The input signal is recognized as the reference vowel which produces the minimum Log Likelihood Ratio distance.

腦의 動特性에 관한 硏究

崔甲石 명지대학교 1986 明大論文集 Vol.17 No.-

本 論文에서는 複素復調法으로 視覺刺戟에 의한 誘發電位에서 일어나는 α-블러킹과 after-discharge 현상을 이용하여 腦의 動特性을 考察하였으며 考察結果 視覺刺戟을 認識하는데 소요되는 時間은 약 300msec, 認識하고 있는 時間은 약 250msec, 腦의 機能이 定常狀態로 回復되는 時間이 약 700msec 정도였음이 확인되었다. In this paper, the dynamic characteristics of the brain are considered through the method of complex demodulation using the α-blocking phenomena and th after-discharge phenomena which are caused by photo stimuli in the evoked potential. The considering results show that the brain takes about 300 msec to recognize the visual stimulus and recognizes the visual stimulus for a time length of about 250 msec and requires about 700 msec to recover the steady state.

近似函數를 利用한 腦波特徵 抽出에 관한 硏究

鄭明眞,崔容燁,崔甲石 明知大學校 産業技術硏究所 1986 産業技術硏究所論文集 Vol.5 No.-

This paper deals with the feature extraction of the EEG quantitatively by the approximating function which approximates the EEG power spectrum with fewer parameters. For the validity of this method the background EEG is recored from 14 subjects in a lying position and with the eyes closed. The parameters of the approximating function for features of the EEG are obtained. As a result features of the EEG for delta, alpha bands can be expressed with the parameters of the approximating function distinctly.

腦波特徵抽出에 관한 硏究

崔甲石 明知大學校 産業技術硏究所 1987 産業技術硏究所論文集 Vol.6 No.1

In the past, some feature extraction methods of the EEG have been used in order to analyze the EEG. Almost all these methodes include many parametes. In this paper, we propose a simple method for estimating power spectrum with appronimating function which is simillar in form to power spectrum of the EEG, and calculate the parameters of this approximating function by fitting the minimum point, the maximum point, and the area between the power spectrum of the EEG and approximating function. Then the features of the power spectrum of the EEG can be expressed by the parameters of the approximating function and the parameters are used to express the feature of the EEG. In order to show the effectiveness of this method, some examples are in vestigated herein.

適應形 移動平均 필터의 마이크로 프러세서 構成에 관한 硏究

崔甲石,金昌錫 명지대학교 1984 明大論文集 Vol.15 No.-

本 論文에서는 廣帶城의 白色雜音과 狹帶城의 周期가 分明치 않는 正弦波 雜音이 重疊되어 있는 低周波 領城의 入力信號로부터 有意信號成分을 抽出하는 適應形 移動平均 필터 (adaptive moving average filter; AMAF)를 提案하였으며, 그것을 마이크로프로세서 Z-80을 사용하여 構成하였다. 그 AMAF는 可變平均振幅을 갖는 單純移動平均필터를 基礎로 하였으며, 그 構成이 單純하고, 安定한 필터이고, 正弦波雜音 除去에는 實用上 有用하다는 것을 표시하였다. In this paper, a adaptive moving average filter (AMAF) is presented which is possible to detect the effective signal from the low frequency input signal containing wide-band white noise and narrow-band sine wave noise with unknown period. The AMAF is implemented with microprocessor Z-80, and it is based on the simple moving average amplitude filter with variable average amplitude. It is confirmed that the AMAF implementation is very simple and its performances are stable, and the sine wave noise are eliminated effectively.

전자빔에 의한 배연가스 정화기술의 화학반응 메카니즘에 대하여

최갑석,최연석,김한석,Choe, Gap-Seok,Choe, Yeon-Seok,Kim, Han-Seok 한국기계연구원 1993 硏究論文集 Vol.23 No.-

The chemistry and performance characteristics of the EBDS process have been introduced, in which experimental results from laboratory, test plant, and pilot plant studies agree very well and can be understood from detailed kinetic models. The parametric dependencies of the NOx and $SO_2$, removal yields on the input conditions have been discussed and formulated quantitatively. The process is best suited for flue gas with high $SO_2$, loadings. The operation conditions, such as dose, ammonia, and water additions, can be adjusted fast upon load changes. The process works waste water free and the major product is a mixture of ammonium nitrate and sulfate that can be used as fertilizer. The up-date results show that the EBDS technology is safe and competitive with other already well-established technologies. Due to these interesting features, the electron beam process has gained much international recognition. Demonstration units of 100MW have been proposed in the United States and Japan. Further pilot plants are under construction in Poland and China, countries that make abundant use of highsulfur coal. Additional research activities are under way to further improve the energy efficiency of process, and accelerator prices have been decreasing during the past 10 years. So the EBDS process has a good chance to start a new generation of emission-control technology.