• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.352-353
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• 2005

In this paper, an ultrasonic level limit sensor with a new structure utilizing the acoustic impedance matching is proposed to be able to check it out a change of water-level. 2 PZT resonators with the same property are bonded directly on the polyethylene plate. One is for transmitter as an ultrasonic transducer, the other one is for receiver. In this case, a polyethylene plate will operate as an acoustic guider to transmit a transverse wave between 2 PZT resonators in air. While in the water, a polyethylene plate having a similar acoustic impedance with the water will be emitted an acoustic energy into the water as a longitudinal wave. According to this mechanism, there was a wide difference of acoustic signal output between underwater and in air. As a summary, it is believed that this proposed level limit sensor could be used as a new one with strong toughness from the external electrical and mechanical noise.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1988년도 전기.전자공학 학술대회 논문집
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• pp.659-661
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• 1988

SPM is MDC Processor for string pattern expressed in directional chain code. In this paper we consider the string pattern matching algorithm (Leve-nstein Algorithm) whitch is portion of Dynamic Programing, and propose architecture of SPM and simulate it on the R-T level to evaluate its architecture. We used the C language as the hardware description language, and developed it on the IBM PC/AT Zenix system V OS environment.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1998년도 Proceedings of International Symposium on Remote Sensing
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• pp.342-348
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• 1998

The purpose of this paper is to extract fast DEM (Digital Elevation Model) using satellite images. DEM extraction consists of three parts. First part is the modeling of satellite position and attitude, second part is the matching of two images to find corresponding poults of them and third part is to calculate the elevation of each point by using the result of the first and second part. The position and attitude modeling of satellite is processed by using GCPs. A area based matching method is used to find corresponding points between the stereo satellite images. In the DEM generation system, this procedure holds most of a processing time, therefore a new fast matching algorithm is proposed to reduce the time for matching. The elevation of each point is calculated using the exterior orientation obtained from modeling and disparity from matching. In this paper, the SPOT satellite images, level IA 6000 $\times$6000 panchromatic images are used to extract DEM. The experiment result shows the possibility of fast DEM. extraction with the satellite images.

• Journal of Power Electronics
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• 제16권1호
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• pp.102-110
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• 2016

Contactless power transfer technology is gaining increasing attention in city transportation applications because of its high mobility and flexibility in charging and its commensurate power level with conductive power transfer method. In this study, an inductively coupled contactless charging system for a 48 V light electric vehicle is proposed. Although this study does not focus on system efficiency, the generic problems in an inductively coupled contactless power transfer system without ferromagnetic structure are discussed. An active load matching method is also proposed to control the power transfer on the receiving side through a load matching converter. Small signal modeling and linear control technology are applied to the load matching converter for port voltage regulation, which effectively controls the power flow into the load. A prototype is built, and experiments are conducted to reveal the intrinsic characteristics of a series-series resonant inductive power charger in terms of frequency, air gap length, power flow control, coil misalignment, and efficiency issues.

• 대한전자공학회논문지
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• 제24권2호
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• pp.324-330
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• 1987

The registration is an important part of image processing and pattern recognition. In this paper, the integral projection method is proposed as the first stage of the two-stage template matching. The computation time of the proposed method is one-tenth of that of the two-stage template matching technique with a sub-template. This method is applied to a noisy (real)image with a different bias level and gives a correct template position, while the two-stage template matching technique with a sub-template cannot detect correctly.

• 한국컴퓨터산업학회논문지
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• 제4권12호
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• pp.1043-1052
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• 2003

본 논문에서는 비디오코딩의 움직임 추정을 위한 빠른 움직임 추정알고리즘을 제안하였다. 제안된 알고리즘은 다단계 연속제거 알고리즘과 효율적인 다단계 연속제거 알고리즘에 기초하고 있다. 제안된 알고리즘은 계층적으로 탐색점을 추출하여 매우 많은 연산량을 필요로 하는 정합 연산량을 감소시키면서 최상의 움직임벡터를 얻을 수 있다. 실험을 통하여 제안된 알고리즘의 효율성을 확인하였다.

• 정보보호학회논문지
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• 제16권4호
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• pp.91-103
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• 2006

본 논문은 지문 인식 알고리즘의 신빙성 있는 성능 평가를 위해 실험에 사용되는 지문 영상 데이터베이스의 특성을 정량화하는 방법과 지문 영상 데이터베이스들의 난이도를 측정하는 방법을 제안하는 것을 목적으로 한다. 이를 위해 지문 영상 정합 시에 영향을 미치는 요소들을 정의하였으며, 두 지문 영상의 정합을 minutiae 기반이 아닌 orientation field을 사용하여 요소들을 평가한다. Orientation filed는 기존의 orientation 방법을 이용하되 계층적으로 측정함으로써 정합시의 속도와 정확성을 개선하였다. 실험 결과, 두 영상을 정합하여 얻어진 각각의 요소들의 측정수치는 데이터베이스들의 특성을 보여준다. 데이터베이스 난이도의 측정은 지문 인식 알고리즘들의 성능을 객관적이고 정량적으로 비교할 수 있게 해준다.

• 대한전자공학회논문지
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• 제26권1호
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• pp.98-103
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• 1989

본 논문에서는 게이트 레벨에서 논리 최적화를 하기 위한, 새로운 시스템을 제안한다. 본 시스템은 회로의 일부분을 간략화된 등가회로로 대치하는 local transformation을 rule로 표현한 rule-based 시스템이다. 본 시스템에서는 효율적인 패턴매칭을 위해, 'rule의 일반화'와 '국소최적화'를 제안한다. Rule의 일반화는 패턴매칭시 회로탐색을 줄이기 위해 사용되며, 국소최적화는 불필요한 회로탐색을 배제하기 위해 사용된다. 또한, 불필요한 패턴매칭 시도를 줄이기 위해, 회로 패턴의 매칭순서를 rule 기술에 포함시킨다. 또한, 본 시스템을 하드웨어 컴파일러에 의해 생성된 논리회로 최적화에 적용하여, 그 효용성을 보인다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제9권6호
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• pp.2050-2077
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• 2015

One of the major issues in emerging cloud management system needs the efficient service level agreement negotiation framework, with an optimal negotiation strategy. Most researchers focus mainly on the atomic service negotiation model, with the assistance of the Agent Controller in the broker part to reduce the total negotiation time, and communication overhead to some extent. This research focuses mainly on composite service negotiation, to further minimize both the total negotiation time and communication overhead through the pre-request optimization of broker strategy. The main objective of this research work is to introduce an Automated Dynamic Service Level Agreement Negotiation Framework (ADSLANF), which consists of an Intelligent Third-party Broker for composite service negotiation between the consumer and the service provider. A broker consists of an Intelligent Third-party Broker Agent, Agent Controller and Additional Agent Controller for managing and controlling its negotiation strategy. The Intelligent third-party broker agent manages the composite service by assigning its atomic services to multiple Agent Controllers. Using the Additional Agent Controllers, the Agent Controllers manage the concurrent negotiation with multiple service providers. In this process, the total negotiation time value is reduced partially. Further, the negotiation strategy is optimized in two stages, viz., Classified Similarity Matching (CSM) approach, and the Truncated Negotiation Group Gale Shapely Stable Matching (TNGGSSM) approach, to minimize the communication overhead.

• 대한원격탐사학회지
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• 제40권1호
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• pp.103-114
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• 2024

The escalating demands for high-resolution satellite imagery necessitate the dissemination of geospatial data with superior accuracy.Achieving precise positioning is imperative for mitigating geometric distortions inherent in high-resolution satellite imagery. However, maintaining sub-pixel level accuracy poses significant challenges within the current technological landscape. This research introduces an approach wherein upsampling is employed on both the satellite image and ground control points (GCPs) chip, facilitating the establishment of a high-resolution satellite image precision sensor orientation. The ensuing analysis entails a comprehensive comparison of matching performance. To evaluate the proposed methodology, the Compact Advanced Satellite 500-1 (CAS500-1), boasting a resolution of 0.5 m, serves as the high-resolution satellite image. Correspondingly, GCP chips with resolutions of 0.25 m and 0.5 m are utilized for the South Korean and North Korean regions, respectively. Results from the experiment reveal that concurrent upsampling of satellite imagery and GCP chips enhances matching performance by up to 50% in comparison to the original resolution. Furthermore, the position error only improved with 2x upsampling. However,with 3x upsampling, the position error tended to increase. This study affirms that meticulous upsampling of high-resolution satellite imagery and GCP chips can yield sub-pixel-level positioning accuracy, thereby advancing the state-of-the-art in the field.