• 한국인터넷방송통신학회논문지
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• 제21권3호
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• pp.73-79
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• 2021

4차 산업 혁명의 물결 속에서 스마트팩토리는 많은 공장에서 요구되고 있다. 하지만, 중소/중견 기업에서는 여전히 노후화된 설비를 보유하고 있어 스마트팩토리의 기초가 되는 데이터 수집 단계에서 어려움을 겪고 있다. 이 연구는 기존 설비의 개조 필요 없이, 설비 제어판의 이미지로부터 데이터를 추출하는 오픈 소스 기반의 기술을 활용 함으로써, 저비용으로 설비 모니터링하는 방법을 제안한다. 제안된 방법은 프로토타핑을 통해 자동차 부품 제조 공장의 단조 설비를 대상으로 테스트하고 평가되었다. 평가 결과 저가형 설비 모니터링이 가능함을 확인하였으며, 중소/중견 기업이 스마트팩토리를 구축하는 데 도움을 줄 것이다.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2005년도 춘계종합학술대회
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• pp.245-251
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• 2005

선박의 자동조타기에는 반드시 방위정보가 필요하며, 방위정보를 제공하는 장비로는 자이로콤파스, 지자기 콤파스 및 GPS 콤파스가 있다. 자이로콤파스는 안정된 동작을 하지만 고가형이므로 주로 대형선박에서 사용되고 있으며, 중소형 선박에서는 저가형의 지자기콤파스 및 GPS 콤파스가 사용되고 있다. 본 연구에서는 지자기콤파스와 GPS 콤파스에서 각각의 단점을 보완하는 방식으로 안정된 방위정보를 제공하는 병행알고리즘의 전자콤파스를 구현하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제15권11호
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• pp.4065-4083
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• 2021

Super-resolution can improve the clarity of low-resolution (LR) images, which can increase the accuracy of high-level compute vision tasks. Portable devices have low computing power and storage performance. Large-scale neural network super-resolution methods are not suitable for portable devices. In order to save the computational cost and the number of parameters, Lightweight image processing method can improve the processing speed of portable devices. Therefore, we propose the Enhanced Information Multiple Distillation Network (EIMDN) to adapt lower delay and cost. The EIMDN takes feedback mechanism as the framework and obtains low level features through high level features. Further, we replace the feature extraction convolution operation in Information Multiple Distillation Block (IMDB), with Ghost module, and propose the Enhanced Information Multiple Distillation Block (EIMDB) to reduce the amount of calculation and the number of parameters. Finally, coordinate attention (CA) is used at the end of IMDB and EIMDB to enhance the important information extraction from Spaces and channels. Experimental results show that our proposed can achieve convergence faster with fewer parameters and computation, compared with other lightweight super-resolution methods. Under the condition of higher peak signal-to-noise ratio (PSNR) and higher structural similarity (SSIM), the performance of network reconstruction image texture and target contour is significantly improved.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2001년도 하계종합학술대회 논문집(5)
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• pp.47-50
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• 2001

Nowadays ARM7 core is used in many fields such as PDA systems because of the low power and low cost. It is a general-purpose processor, designed for both efficient digital signal processing and controller operations. But the advent of the wireless communication creates a need for high computational performance for signal processing. And then This paper has been designed a floating-point multiplier compatible to IEEE-754 single precision format for ARMTTDMI performance improvement.

• Bulletin of the Korean Chemical Society
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• 제20권8호
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• pp.885-892
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• 1999

This communication describes the synthesis of : (i) non-toxic and low cost nanocrystalline electrode materials, which can be prepared advantageously at low temperature ; (ii) highly conductive electrolyte membranes formed by the nano-encapsulation within a poly(acrylonitrile)-based polymer matrix of a solution of LiPF6 in organic solvants. The performances of rechargeable PLR (Plastic Lithium Rechargeable) batteries using the above mentioned components are presented.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.263-265
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• 2003

The computation cost of image registration is affected by searching data size and space. This paper proposes an efficient image registration algorithm that uses multi-resolution wavelet decomposed image to reduce the data size search. The algorithm determines the correlation detection at low resolution on low-pass sub bands of wavelet and generate mask for higher resolution as part of a coarse to fine registration algorithm. The correlation matching is defined for coarse resolution similarity measurement, while mutual information (MI) is used at fine resolution. The results show that the new efficient mask-based algorithm improves computational efficiency and yields robust and consistent image registration results.

• 한국전자파학회논문지
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• 제29권10호
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• pp.752-757
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• 2018

본 논문은 인쇄기판을 금속 구조물에 접착하여 제작한 77 GHz 도파관 슬롯 배열 안테나의 성능 평가 결과를 제시한다. 77 GHz 도파관을 상판과 하부 구조체로 나누어 상판은 저가로 미세 슬롯 구현에 유리한 인쇄기판을 이용하여 제작하고, 하부 구조체는 금속 가공하여 제작한 후, ACF(Anisotropic Conductive Film)을 이용하여 접합하였다. 안테나 성능평가를 위해 $1{\times}16$ 슬롯 배열 안테나를 제안 방식으로 제작하고, 이득과 패턴을 측정하여 시뮬레이션 값과 비교하였다. 측정 결과, 이상적 접합 조건으로 시뮬레이션한 결과 대비 2.3~3.5 dB의 이득 저하가 나타났지만 패턴은 변화가 거의 없으며, 제안 방식을 이용하면 77 GHz에서 약 17 dBi의 이득의 슬롯 안테나를 저가로 간단히 제작할 수 있음을 확인하였다.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2004년도 하계종합학술대회 논문집(1)
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• pp.7-10
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• 2004

This paper describes techniques to implement low-cost adapt ive Pipelined LMS filter for ASIC implement ions of high communication receivers. Power consumpiton can be reduced using a careful selection of architectural, algorithmic, and VLSI circuit techlifue A Pipelined architecture for the strength-reduced algorithm is then developed via the relaxed look-ahead transformation. This technique, which is an approximation of the conventional look-ahead compution, maintains the functionality of the algorithm rather than the input-output behavior Convergence maiysis of the Proposed architecture has been presented and support via simulation results. The resulting pipelined adaptive filter achives a higher though put requires lower power as compared to the filter using the serial algorithm.

• 한국전기전자재료학회논문지
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• 제28권9호
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• pp.602-606
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• 2015

This paper presents a ZigBee wireless communication system for remote diagnosis in overhead distribution power lines. The system is divided in three parts in the functional aspect - a host computer module, a remote controller module and a diagnostic system module. The host computer module designed as USB interface transmits control signals and receive data measured by sensor. The remote controller module operates the diagnostic system. Diagnostic system module communicates with internal main controller and host computer USB. Multiple communication channel is adopted for simultaneous operations of several diagnostic system. Dedicated protocol for each module is developed. The system is designed with a focus on low cost and small size suitable for lightweight and small diagnostic system.

• Journal of Information Processing Systems
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• 제11권3호
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• pp.342-353
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• 2015

It is widely accepted that single carrier frequency division multiple access (SC-FDMA) is an excellent candidate for broadband wireless systems. Channel estimation is one of the key challenges in SC-FDMA, since accurate channel estimation can significantly improve equalization at the receiver and, consequently, enhance the communication performances. In this paper, we study the application of compressive sensing for sparse channel estimation in a SC-FDMA system. By skillfully designing pilots, their patterns, and taking advantages of the sparsity of the channel impulse response, the proposed system realizes channel estimation at a low cost. Simulation results show that it can achieve significantly improved performance in a frequency selective fading sparse channel with fewer pilots.