• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.1063-1068
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• 1989

In a two-dimensional positioning system using M-array, the crosscorrelation between the observed M-array and the reference M-array is calculated. In this case, when the distance between the object and the camera is varied, the crosscorrelation value fluctuates. This paper investigates the effect of variation of size of M-array on the crosscorrelation values.

• 한국전자통신학회논문지
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• 제6권1호
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• pp.13-19
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• 2011

Games는 같은 원시다항식을 갖는 m-수열과 GMW 수열의 상호상관관계 함수를 계산하는 방법을 제안하였다. 본 논문에서는 같은 원시다항식에 의해서 생성된 Kasami 수열과 No 수열들의 상호상관관계 함수를 두 개의 기준수열들의 주기적 상호상관관계함수를 이용하여 계산한다. 이 방법은 Games에 의해서 제안된 방법과는 다르다.

• 대한전자공학회논문지SD
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• 제47권10호
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• pp.29-33
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• 2010

변형된 time mapped prime sequences를 time spreading pattern에 이용하여 다양한 wavelength-time codeword를 구현하는 방법을 연구하였다. 이 연구 결과 $P_t$ = 3 일 때는 autocorrelation sidelobe와 crosscorrelation을 1이하로 유지하며 사용하는 파장 수의 제곱에 해 당하는 wavelength-time codeword를 생성 할 수 있으며 $P_t$ = 5 와 $P_t$ = 7 일 때는 crosscorrelation을 1이하로 유지하면서 $P_w$개의 wavelength-time codeword에 대해서 autocorrelation sidelobe를 2이하로 제한하는 범위에서 역시 사용하는 파장 수의 제곱에 해당하는 wavelength-time codeword를 생성할 수 있다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(1)
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• pp.221-224
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• 2001

A new code: LS code was proposed for IMT-2000 CDMA system. The code has special properties during a certain time of interval: 1) perfect autocorrelation 2) perfect crosscorrelation. The perfect autocorrelation means that the autocorrelation has nMaximum for zero time-offset and zero for other times during a certain time. Moreover the perfect crosscorrelation means that the crosscorrelation has zero during a time of interest. In the LAS-DMA system, the LS code is only used in the spreading of data bits in contrast to the conventional CDMA system. Therefore the LS code pair setting and allocation order should be dealt with carefully considering the special properties of LS code. This paper is intended as an investigation of the setting LS code pair and the sequential allocation method. Firstly, the optimum LS code pair set is proposed in order to minimize PAPR. Secondly, the sequential allocation method is studied to either minimize PAPR or expand IFW.

• Journal of Communications and Networks
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• 제5권1호
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• pp.19-24
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• 2003

A new code, LS code, was proposed for the IMT-2000 CDMA system. The code has special properties during a specific time interval: 1) perfect autocorrelation, and 2) perfect crosscorrelation. Perfect autocorrelation means maximum autocorrelation for zero time-offset and zero autocorrelation for all other times during a specific time interval. Moreover, perfect crosscorrelation means that the crosscorrelation has zero value during a certain time, you can remove all the MAI within that time. However, the detailed properties of LS code and its exact generation method have been previously unknown. Therefore, we investigate the LS code in regards to its exact generating method, properties, and performances in this paper.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1989년도 한국자동제어학술회의논문집; Seoul, Korea; 27-28 Oct. 1989
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• pp.1059-1062
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• 1989

This paper describes a new method for two-dimensional(2D) positioning system by use of crosscorrelation of vague M-arrays. An M-array pattern is attached on an object to be positioned and it is observed by a TV camera in out-of-focus condition. The crosscorrelation between the observed image data and the reference M-array gives us the information about the 2D position of the object.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1998년도 추계학술대회
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• pp.179-180
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• 1998

In this paper, we propose an algorithm to detect fetal movements using M-mode ultrasonography. To do this work automatically, we find the crosscorrelation between the current data vector of the depth direction of M-mode image and the previous one. In the crosscorrelation estimator, the variations of time lag $\tau$ at maximum crosscorrelation value means fetal movements. A woman in the 37th week of pregnancy was monitored and the ultrasonic image of fetus was recorded over 20-minute period to detect fetal movements using B-mode and M-mode ultrasonography simultaneously. And the presented method was compared with maternal perception and B-mode ultrasonography observed by clinician. The maternal perception method detected only 57% of all fetal movements observed by clinician. The detection of the presented method corresponds to the clinician's detection result.

• 한국통신학회논문지
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• 제18권11호
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• pp.1735-1741
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• 1993

주파수 도약 다원접속 통신시스템에 사용될 수 있는 우수한 해밍자기상관성 및 타 상관성 그리고 긴주기를 갖는 새로운 주파수 도약 패턴순이 소개되었다. 주파수 도략 패턴순의 주기는 qk-1, 알파벧 크기는 q, 주파수 도약 패턴군의 크기는 q인데, 여기서 k는 임의의 양의정수 그리고 q는 소수의 정수승이다. 자시상관함수 및 타 상관함수의 최대값은 qk-1(trivial 경우 제외)인데 이것은 최적의 해밍 상관함수에 해당된다. 그리고 주파수 도약 패턴에 있어서 q*q 스퀘어당 평균 충돌의 수는 1보다 작다.

• 정보보호학회지
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• 제2권2호
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• pp.87-92
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• 1992

• Transactions on Control, Automation and Systems Engineering
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• 제4권2호
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• pp.109-113
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• 2002

Van de Vusse reactor is known as a highly nonlinear chemical process and has been considered by a number of researchers as a benchmark problem for nonlinear chemical process. Various identification methods for nonlinear system are also verified by applying these methods to Van de Vusse reactor. From the point of view of identification, only the Volterra kernel of second order has been obtained until now. In this paper, the authors show that Volterra kernels of nonlinear Van de Vusse reactor of up to 3rd order are obtained by use of M-sequence correlation method. A pseudo-random M-sequence is applied to Van de Vusse reactor as an input and its output is measured. Taking the crosscorrelation function between the input and the output, we obtain up to 3rd order Volterra kernels, which is the highest order Volterra kernel obtained until now for Van de Vusse reactor. Computer simulations show that when Van de Vusse chemical process is identified by use of up to 3rd order Volterra kernels, a good agreement is observed between the calculated output and the actual output.