대역통과 디지털 필터의 계수양자화

윤달환,유근호 외1명 陸軍士官學校 1992 한국군사학논집 Vol.42 No.-

It is difficult in hardware design that the coefficients of h(n) obtained by the Chebyshev approximation of the digital filter is the value with the infinite precision. But recently, the effective developement technique of the hardware has been advanced in the microprocessor, bit-slice technology, programmable digital signal process. In hardware realization, the registor length determines the implement cost. So it is necessary of approximating the coefficients of h(n) with the bit-length. There are two methods such that 1.after we truncates the coefficient of h(n) with given bit-length(or word-length) and optimize the value. 2.how many bits are needed to obtain the precision correspoding to the infinite precision coefficients? In the FIR digital filter design with the microprocessor, it is necessary of quantizing the coefficient of h(n) to the finite word length. This paper determines the initial value using the existing Remez exchange algorithm and obtain the error value which is difference between initial value and integer value, and finally analyize the correlation between real value and integer value through the sampling bit.

수중 작업자의 안전성 강화를 위한 원적외선 온열효과용 친환경 카본 성형체 신뢰성 연구

윤달환,박훈민,김승호 사단법인 한국안전문화학회 2020 안전문화연구 Vol.- No.9

In this paper, we have developed the friendly environmental nano carbon form for body temperature strengthen of water worker, which is based on the far-infrared thermotherapy effect. It has a reducing process of oxidation and the viscous fluid control, after hardening to the stylene monomer and methylol acrylamide monomer using an acrylic emulsion junction material. Then we can obtain the sphere form structure of diagonal 1∼3 mm, they have mixture the acrylic emulsion junction material(45%) and the coconut carbon powder(55%) of size 300∼500 mesh for 25∼30 min. Finally, if we have dry for the formated carbon including 30∼90 minute at 90∼300°C, then be obtained for pure carbon formation of 95%. In order to identify the safety of the friendly circumstance carbon formation, we have tested the far-infrared ratio, energy analysis, gas density and anti-disease germs experiment.

FSE를 이용한 MMADF알고리듬 수렴특성 개선

윤달환 世明大學校 1995 世明論叢 Vol.4 No.-

본 논문에서는 DPCM(Differential Pulse Code Modulation)과 Sign 알고리듬을 이용한 MADF 구조에서 간단한 1차 필터를 첨가한 구조를 이용하여, 곱셈연산이 필요치 않은 변형 비적 적응필터(MMADF : Modified Multiplication-free Adaptive Filter)알고리듬을 제안하고 수렴특성을 해석한다. 수렴특성을 평가하기 위하여 분할 등화기(FSE : Fractionally Spaced Equallizer)에 적용하였으며, 기존의 Sign 알고리듬, MADF 알고리듬 및 제안한 MMADF 알고리듬을 사용하여 정상상태오차와 수렴속도로 특성을 비교평가 한다. 동일한 정상상태오차를 갖는 조건에서 MMADF 알고리듬을 FSE에 적용한 결과 안정된 수렴특성을 나타내었으며, 기존의 Sign 및 MADF 알고리듬에 비해 신호특성 및 수렴속도가 개선 되었다. In this paper, the structure of modified multiplication-free adaptive filter(M-MADF) and convergence alanysis are presented. To evaluate the performance of proposed M-MADF algorithm, fractionally spaced equalizer(FSE) is used. The input signals are quantized using DPCM and the reference signals is processed using a first-order linear prediction filter, and the outputs are processed by a conventional adaptive filter. The filter coefficients are updated using the Sign algorithm. Unter the assumption that the primary and reference signals are zero mean, wide-sense stationary and Gaussian, theoretical results for the coefficient misalignment vector and its autocorrelation, matrix behavior of the filter are driven. The convergence properties of Sign, MADF and M-MADF algorithm for updating of the coefficients of a FIR digital filter of the fractionally spaced equalizer(FSE) are investigated and compared with one another. The convergence properties are characterized by the steady state error and the convergence speed. It is shown that the convergence speed of M-MADF is almost same as Sign algorithm and is faster than MADF in the condition of same steady state error. Especially it is very useful for high correlated signals.

분할등화기를 이용한 개선된 비적적응필터

尹達桓 대한전자공학회 2002 電子工學會論文誌-SP (Signal processing) Vol.39 No.3

In order to remove the intersymbol interference(ISI) phenomenon in data transmission channel, the structure and convergence analysis of the improved multiplication free adaptive digital filter(IMADF) is presented. Under conditions of zero-mean, wide-sense stationary and white Gaussian noise, it is shown that this paper analyze the convergence characteristics of the IMADF with a fractionally-spaced equalizer(FSE). In the experimental results, the convergence characteristics of the IMADF algorithm is almost same as the sign algorithm, but is better than the MADF algorithm. Here, this algorithm has useful characteristics when the correlation of the input signal is highly. 데이터 전송채널에서 부호간간섭(ISI)을 제거하기 위해 개선된 비적적응 디지털필터(IMADF)의 구조와 수렴해석이 이루어진다. 0 평균, 백색잠음하에서 분할등화기(FSE)를 이용한 IMADF의 수렴특성을 해석한다. 실험결과 1MADF 알고리즘의 수렴독성이 Sign 알고리즘과는 같으나, MADF 알고리즘 보다 우수하다. 특히 입력신호의 상관관계가 높을 때 유용한 특성을 갖는다.

심장의 Multidipole 전류원 모델링 및 신호분석

윤달환 世明대학교 한의학연구소 2003 韓醫學硏究所 論文集 Vol.5 No.-

In this paper, we have invented the multi-dipole current source system to develop the magnetocardiograph (MCG) system for diagnosing a heart disease. we derive the QRS pulse form of the heart by using th MCG system with this system, and evaluate the performance.

안전성 강화를 위한 공정융합 기반의 보트 기구물 개발

윤달환,김승호,민홍기 사단법인 한국안전문화학회 2020 안전문화연구 Vol.- No.9

In this paper, we have developed the boat aerostat for the safety strengthen based on the manufacture convergence. When we are make of an aerostst for boat air structure, the contacted strength and transformation characteristics is an important element to the safe performance. Really, the manufacture process of the aerostst using an air have been made of manually, the manufacture convergence can minimized the transformation of an aerostat and obtain the safety performance. The optimal condition to a strengthen construction of boat can safe the post deformability of the strengthen structure. Under these condition, we can advance the an quality construction that based on the model and database information of the boat. Also, we can have an effective process management and retrench the production cost.

지역특성화를 통한 전방위 바이오산업 경쟁력강화 방안

윤달환 世明대학교 한의학연구소 2004 韓醫學硏究所 論文集 Vol.6 No.-

A regional development strategy of OECD nations have promoted in the systemic approach and knowledge-based method, and the strengthen policy of a national competitive power for a specific region. Also, they builded the productive group of a specific region, reformed the competitive power of their company and derived the relationship strengthen policy among an industry the univeristy and the laboratory. In order to increase a national competitive power, they have relase a regulative rule have an education with wide latitude to a laboratory and development and overseas market. This paper discuss the competitive power strengthen method of post bio-industry based on these experience of the advanced nations. Also, the central government have promoted the technology strengthen of a specific region like the textile industry of the DauGu. In strict speaking, it is the chemical textile industry and dyed goods industry. After these promotive policy, there were took places various problems. In spite of the efforts of the central and local government, many textile company closed their work places. The actual exports have largely decreased. What's the matter?

PECL과 역메사형 HFF를 이용한 소형세라믹 VCXO 개발

윤달환,이재경,Yoon Dal-Han,Lee Jae-Kyung 대한전자공학회 2005 電子工學會論文誌-SC (System and control) Vol.42 No.1

통신시스템의 경박단소화와 고부가가치 기술 추세에 따라 전압제어 수정발진기(VCXO)도 소형화와 경향화를 향하고 있다. 기존의 VCXO는 9×14mm의 크기가 주류를 이루었으나 양의 에미터결합논리(PECL)와 적층 세라믹 SMD 패키지기술을 통하여 5×7 mm의 크기로 소형화한 VCXO를 개발한다. 이는 역메사형 HFF 수정설계 기술과 세라믹 SMD 공정선을 접목시키고 생산프로세스를 단축하는 효과도 얻는다. Recently, the multimedia and high speed telecommunication systems needs a high frequency and high stability oscillator. The VCXO(voltage controlled -crystal oscillator) have continually downsized to gratify a thin and small size of the telecommunication systems. In his paper, we have developed the small ceramic PECL(positive emitter-coupled logic) VCXO of the 5×7 mm size for gratifying the requested specifications from user, and then use the multilayer ceramic SMD(surface mounted device) package technology. The ceramic SMD PECL VCXO is operating at the 3.3 Voltage and have the frequency range of 120MHz~180MHz. The Q factor is over 5K and it has the low jitter characteristics of 3.5 ps and low phase noise.

차량 연료히터의 전기적 성능시험 평가 시스템 구현

윤달환,Yoon, Dal-Hwan 한국전기전자학회 2013 전기전자학회논문지 Vol.17 No.1

본 연구에서는 차량용 연료히터의 전기적 성능검사 챔버를 구현한다. 겨울철 저온환경의 영향을 받는 디젤 엔진이 냉각될 경우 일정한 온도 이하로 내려가면 파라핀과 같은 반고체 상태인 왁싱(Waxing)물질을 형성하여 엔진 시동이 잘 걸리지 않게 하는 원인이 된다. 히터내에 센서를 안착시켜 통합한 일체형 통합히터는 시동성 평가에 중요한 요소이며, 성능평가 시험 챔버 시스템을 통해 전기적인 특성을 시험한다. 최근 CRDI(커먼레일) 엔진을 주로 사용함에 따라 연료히터로 디젤오일을 가열하여 점화성능을 향상시키기 위한 연료히터 성능시험은 엔진의 시동성을 향상시키는 중요한 요소이다. 따라서 연료히터의 전기적 성능시험 검사항목은 상온, 극저온, 극고온에서 동작검사, 시험저항 설정에 따른 저항동작 지연시간 및 전류동작 지연시간, 온도변화에 따른 바이메탈 지연시간 검사, 블록히터의 전류 및 저항 검사, 히팅 운전검사 등을 수행하도록 설계한다. In this paper, we have implemented the performance evaluation system of the unified fuel heater for CRDI diesel engine. If the diesel engine be cold by low temperature in winter, then that makes the waxing materials like a paraffin and is the source of poor engine starting. The unified fuel heater is the barrow meter that estimate the start performance of diesel engine, and be tested by test chamber. The chamber perform the normal temperature, an extremely low temperature, an operating performance in an extremely high temperature, the resistance operation delay time and current operation delay time in setting up test resistance, the bimetal delay time test in temperature variation, the current and resistor test of the composited heater, a heating operation test.

QFT를 이용한 TDX-계열 교환기용 DTMF 수신기의 성능평가

윤달환 한국통신학회 2001 韓國通信學會論文誌 Vol.26 No.11

DTMF(multi-tone multi-frequency) 신호의 경제적인 검출은 저렴한 가격의 통신장비를 개발하는데 중요한 요소이다. 현재 사용하고 있는 전전자식 교환기의 각 채널은 서로 독립된 DTMF수신기 회로를 갖고 있으며, 검출된 신호를 프로세서에 알려준다. 본 논문은 다중채널 DTMF수신기 신호검출에 QFT(quick Fourier transform) 알고리듬을 적용한다. 2$^{M}$개 실계수 데이터를 이용할 경우 기존의 radix-2 Cooley-Turkey FFT, Goertzel 및 DFT 알고리듬보다 처리시간과 메모리 소모를 줄이는 효과적인 알고리듬임을 보인다.다. The economical detection of dual-tone multi-frequency(DTMF) signals is an important factor when developing cost-effective telecommunication equipment. Each channel has independently a DTMF receiver, and it informs the detected signal to processors. In order to detect the DTMF signals, this paper analyze the power spectra of the DTMF receiver by using the QFT algorithm. As experimental result, by analyzing 2$\^$M/ real data in terms of ITU-T specification, it show that the QFT algorithm improve the performance of the DTMF receiver and can save memory waste and can the real-time processing.