• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 춘계학술대회 논문집
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• pp.377-378
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• 2008

• 한국군사과학기술학회지
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• 제19권2호
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• pp.155-162
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• 2016

TASS(Towed Array Sonar System) is a sonar system which tows the sensor array behind a platform. Array shape is generally assumed to be a straight line. But the array shape is often distorted by oceanic current or platform maneuvering which causes the performance loss of signal processing method like beamforming. So array shape estimation methods are needed. Typically the method based on Kalman filter using heading sensor is used. In practice, the measurement is corrupted by biases which are caused by rotation of the tow cable, varying magnetic fields and slowly varying stresses in the mechanical construction. Although they can't be calibrated but can be estimated. In this paper, we suggest the array shape estimation method based on Kalman filter compensating the sensor biases.

• 한국음향학회:학술대회논문집
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• 한국음향학회 1998년도 학술발표대회 논문집 제17권 1호
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• pp.487-490
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• 1998

본 논문에서는 천해 환경에서 multitone MFP를 하기 위한 다양한 시뮬레이션을 수행하고 여러 관점에서 multitone MFP의 성능을 분석하였다.

• 한국정보처리학회논문지
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• 제2권6호
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• pp.969-973
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• 1995

본 논문에서는 기존의 병렬 승산기 어레이에서 사용된 CSA(carry select adder) 셀 구조를 수정하여 승산시간을 감소하는 새로운 병렬 승산기 어레이를 제안한다. MCSA(modified CSA)의 입력에 가수와 피가수가 자리올림보다 먼저 인가된다. 그리고 자리올림 전달 가산기를 위하여 DCSA(doubled inverted imput CSA)를 설계하여 최종 승산항 다음에 추가한다. 제안된 안은 MCSA와 DCSA를 사용하여 설계하고 모의실험을 한다. 회로의 크기는 기존의 CAS셀을 사용한 기존의 승산기 어레이에 비하여 약 13% 증가했지만 연산시간은 약 52% 감소함을 확인하였다.

• 전자공학회논문지C
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• 제35C권2호
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• pp.29-35
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• 1998

This paper describes architectures and design of a SIMD type parallel image processing chip called SliM-II. The chiphas a linear array of 64 processing elements (PEs), operates at 30 MHz in the worst case simulation and gives at least 1.92 GIPS. In contrast to existing array processors, such as IMAP, MGAP-2, VIP, etc., each PE has a multiplier that is quite effective for convolution, template matching, etc. The instruction set can execute an ALU operation, data I/O, and inter-PE communication simulataneously in a single instruction cycle. In addition, during the ALU/multiplier operation, SliM-II provides parallel move between the register file and on-chip memory as in DSP chips, SliM-II can greatly reduce the inter-PE communication overhead, due to the idea a sliding, which is a technique of overlapping inter-PE communication with computation. Moreover, the bandwidth of data I/O and inter-PE communication increases due to bit-parallel data paths. We used the COMPASS$^{TM}$ 3.3 V 0.6.$\mu$m standrd cell library (v8r4.10). The total number of transistors is about 1.5 muillions, the core size is 13.2 * 13.0 mm$^{2}$ and the package type is 208 pin PQ2 (Power Quad 2). The performance evaluation shows that, compared to a existing array processors, a proposed architeture gives a significant improvement for algorithms requiring multiplications.s.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2001년도 춘계종합학술대회
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• pp.265-268
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• 2001

본 논문에서는 프랙탈 영상압축 알고리즘의 고속처리를 위한 효율적인 일차원 VLSI 어레이를 설계한다 프랙탈 영상압축 알고리즘은 영상을 정의역블럭과 치역블럭을 나누고, 블럭간의 자기유사성을 비교하여 데이터를 압축시킨다. 이때 정의역블럭은 치역블럭의 두배크기로 인접한 정의역블럭과 50% 중첩시켜 분할한다. 인접한 두 정의역 블럭의 픽셀들이 중첩되므로, 이 픽셀들을 재사용하여 데이터의 입력수를 줄이고 처리속도를 향상시킬수 있다. 이 결과 최소한의 레지스터와 MUX, DEMUX의 추가만으로 약 25%의 처리속도 향상을 얻을 수 있다.

• 한국통신학회논문지
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• 제32권8C호
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• pp.745-757
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• 2007

본 논문에서는 GPS 수신기로 유입되는 간섭 및 재밍 신호를 효율적으로 제거 또는 억압하기 위해 배열 안테나(way antenna)를 적용한 항 재밍(anti-jamming) GPS 시스템을 설계하고 운용 방안을 제시하였다. 특히 제안하는 안테나 구조 및 운용 방안은 전통적인 6 원형 배열 안테나(6 circular array antenna) 구조에서 중앙에 1개의 소자를 추가한 7 배열 원형 안테나 구조로써 주어진 간섭 및 재밍 환경 하에서 전력 효율적으로 운용된다. 아울러 적응형 배열 안테나를 사용하여 디지털 신호처리를 수행할 경우 성능이 우수한 것으로 잘 알려진 STAP(Space Time Adaptive Process)와 SFAP(Space Frequency Adaptive Process)를 적용하고 두 방식의 구조 및 복잡도에 관한 분석, 그리고 동일한 복잡도(Complexity) 조건에서 다양한 재밍 환경에서의 BER 성능 비교를 수행하였다.

• 전기학회논문지
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• 제57권12호
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• pp.2300-2307
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• 2008

This study receives the noise transmitted in a constant audio frequency range through a microphone array in which the noise(like grease in a pan) occurs on the power supply line due to the troublesome partial discharge(arc). Then by going through a series of signal processing of removing noise, this study measures the distance and direction up to the noise caused by the troublesome partial discharge(arc) and monitors the result by displaying in the analog and digital method. After these, it determines the state of each size and judges the distance and direction of problematic part. When the signal sound transmitted by the signal source of bad insulator is received on each microphone, the signal comes only in the frequency range of 20 kHz by passing through the circuit of amplification and 6th low pass filter. Then, this signal is entered in a digital value of digital signal processing(TMS320F2812) through the 16-bit A/D conversion. By doing so, the sound distance, direction and coordinate of bad insulator can be detected by realizing the correlation method of detecting the arriving time difference occurring on each microphone and the algorithm of detecting maximum time difference.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2008년도 추계학술대회논문집
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• pp.699-704
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• 2008

This paper describes a general approach for processing data from an omni-directional guided wave transducer array for the rapid inspection of large plate structures. A basic phased array algorithm is presented that can be applied to any array Geometry. For guided waves on plate, beam steering algorithm is derived and the corresponding beam pattern is analyzed. The algorithms are applied to simulation and experimental data. The results show well its usefulness in structural applications.

• 소성∙가공
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• 제7권2호
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• pp.127-138
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• 1998

Process design of multi-step wire drawing process, conducted by means of finite element analysis and ANN(Artificial Neural Network) has been considered. The investigated problem involves the ade-quate selection of the drawing die angle and the correspondent reduction rate in the condition of desired initial and final diameter. Combinations of the process parameters which are used in finite ele-ment simulation are selected by using the orthogonal array. Also the orthogonal array. Also the orthogonal array and the results of finite element simulation which are related to the process energy are used as train data of ANN. In this study it is shown that the application of new technique using ANN and Othogonal array table to the process design of metal forming process is useful method.