• 제목/요약/키워드: Minimize Total Error

검색결과 76건 처리시간 0.031초

해수센싱 방법의 개선에 의한 EPIRB오동작의 최소화방안 연구 (A Study on Minimize Method of EPIRB's Error Operation by Improve the Seawater Sensing)

  • 이영수;최조천
    • 한국정보통신학회논문지
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    • 제10권11호
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    • pp.1978-1982
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    • 2006
  • EPIRB는 기존의 통신방식에 대한 문제점은 해결하였으나, EPIRB에 대한 제작사마다 취급방법의 상이 등으로 인한 사용자의 취급부주의 또는 설비 의 결함 등으로 국제적으로 실제 조난신호가 아닌 허위의 조난신호가 전체 신호의 약 94%를 차지하는 문제점이 대두되었다. 이에 따라 국제기구 및 제작사 등에서는 오발사를 감소시키기 위한 다양한 방법이 강구되었고 제작사에서는 설비의 특성을 고려하여 초기의 자동이탈장치에서 EPIRB가 분리되면 즉시 발사되는 형태에서 자동이탈장치에서 EPRB가 이탈되어도 해수에 잠겨야만 조난신호가 발사되도록 개선하였으나 아직도 오발사는 크게 줄어들지 않고 있는 실정이다. 본 논문에서는 현행 COSPAS-SARSAT시스템 및 EPIRB의 국내 외 기술기준 및 표준 등을 검토하여 EPIRB의 오발사를 최소화하는 방안으로 브리지 형 해수검출 센서를 연구하였다.

테이블 방법을 이용한 절대위치 검출기에 대한 개선된 위상 오차 보상 (An Improved Phase Error Compensation for an Absolute Position Detector using Table Method)

  • 안기호;김시현;양윤기;이창수
    • 제어로봇시스템학회논문지
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    • 제16권10호
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    • pp.975-981
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    • 2010
  • Existing error compensation method of industrial electronic absolute displacement detector only depends on skilled engineers. This paper proposes a new table method in order to automatize error compensation. An waveform changes according to the parallel resistance for each pole were tabularized and four waveforms were superimposed to minimize total phase error. These process was verified using simulink. As a result of applying proposed method to the real sensor, peak to peak error was reduced from $3.428^{\circ}$ to $0.879^{\circ}$. In this case, compensation resistance is $4.7k\Omega$ in B pole and $20k\Omega$ in C pole. This compensation rate is comparable to skilled engineers, and it takes 0.8 second which is far shorter than 15 minutes when expert does.

이동 통신 채널에서 직교 주파수 분할 다중 시스템의 성능 연구 (On the Performance of an Orthogonal Frequency Division Multiplexing System in a Mobile Radio Channel)

  • 김윤희;송익호;김상우;방영조
    • 한국방송∙미디어공학회:학술대회논문집
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    • 한국방송공학회 1996년도 학술대회
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    • pp.55-59
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    • 1996
  • In this paper, we first analyze the influence of interference due to the time variation and delay spread of the mobile channel on an orthogonal frequency division multiplexing (OFDM) system. With the result, we obtain the bit error rate performance of the 16-QAM OFDM system. Second, we investigate the performance of the Reed-Solomon (RS) coded 16-QAM OFDM system when the number of subcarriers varies. In the investigation, we assume that the information transmission rate and the total bandwidth expansion due to coding, guard interval, and the number of subcarriers are fixed. Under this condition, it is observed that there are optimum numbers of subcarriers that minimize the post decoding symbol error probability of RS code for various channel states.

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쾌속조형에서 직교배열표를 이용한 단면화 (Slicing Using Orthogonal Arrays For Rapid Prototyping)

  • 김재형;김재정
    • 한국정밀공학회지
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    • 제17권6호
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    • pp.69-75
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    • 2000
  • At the stage of initial design, prototypes are needed for engineering and aesthetic purposes. In order to get a fast and non-expensive prototype, designers prefer rapid prototyping(RP) to any other means. In driving a 3D CAD model into rapid prototyping, sectioning the model is essential and there are two negotiation-needed targets, enhancing accuracy while taking less build-time, which makes adaptive slicing taken into account. In spite of the advantages of adaptive slicing, it is not yet applied to real RP machines because of the limits of hardwares. In this thesis, a new slicing algorithm which (1)uses several values of thickness available in a RP machine. (2)determines total number of layers to make the prototype within the intended time and (3)arranges the layers using orthogonal arrays to minimize the volume error caused by the difference between a given CAD model and a fabricated model is presented. And the algorithm is expected to have possibility of assisting RP machines to take the advantages of adaptive slicing.

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사용단계에서 주기적 서비스 팩 배포와 불확실한 패치 배포를 고려한 소프트웨어의 최적 출시시기 (Optimal Release Time for Software Considering Distribution of Periodic Service Packs and Uncertain Patches during Operational Phase)

  • 박일광;공명복
    • 대한산업공학회지
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    • 제33권4호
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    • pp.487-493
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    • 2007
  • In this paper, we deal with an optimal software-release problem of determining the time to stop testing and release the software system to the user. The optimal release time problem is considered from maintenance like the periodic distribution of service packs and the unpredictable distribution of patches after the release. Moreover, the environment of software error-detection during operation differs from the environment during testing. This paper proposes the software reliability growth model which incorporates periodic service packs, unpredictable patches and operational environment. Based on the proposed model, we derive optimal release time to minimize total cost composed of fixing an error, testing and maintenance. Using numerical examples, optimal release time is determined and illustrated.

Supervised-learning-based algorithm for color image compression

  • Liu, Xue-Dong;Wang, Meng-Yue;Sa, Ji-Ming
    • ETRI Journal
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    • 제42권2호
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    • pp.258-271
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    • 2020
  • A correlation exists between luminance samples and chrominance samples of a color image. It is beneficial to exploit such interchannel redundancy for color image compression. We propose an algorithm that predicts chrominance components Cb and Cr from the luminance component Y. The prediction model is trained by supervised learning with Laplacian-regularized least squares to minimize the total prediction error. Kernel principal component analysis mapping, which reduces computational complexity, is implemented on the same point set at both the encoder and decoder to ensure that predictions are identical at both the ends without signaling extra location information. In addition, chrominance subsampling and entropy coding for model parameters are adopted to further reduce the bit rate. Finally, luminance information and model parameters are stored for image reconstruction. Experimental results show the performance superiority of the proposed algorithm over its predecessor and JPEG, and even over JPEG-XR. The compensation version with the chrominance difference of the proposed algorithm performs close to and even better than JPEG2000 in some cases.

최대 다이버시티 이득을 얻기 위한 복호 후 전달 (Decode-and-Forward) 릴레이 시스템의 위치에 관한 연구 (Relay Position in Decode-and-Forward Relay Systems to Achieve Full Diversity Gain)

  • 곽경철;서우현;홍대식
    • 한국통신학회논문지
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    • 제32권12A호
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    • pp.1260-1266
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    • 2007
  • 송신국 (Source) 과 릴레이 사이의 중계 링크에서 발생한 오류는 복호 후 전달(decode-and-forward, DF) 릴레이 시스템의 성능을 제한하고 릴레이와의 협력으로 얻을 수 있는 최대 다이버시티 이득을 얻지 못 하도록 한다. 또한, 전체 복호 후 전달 릴레이 시스템의 오류 확률은 릴레이와 수신국 (destination)에서 발생한 에러의 합으로 표현되므로 최대 다이버시티 이득을 얻기 위해서는 중계 링크의 오류 확률은 수신국에서 오류 전파 없이 maximum ratio combining (MRC)을 적용한 오류 확률보다 작아야 한다. 이러한 조건을 만족시키는 릴레이의 위치 범위에 릴레이가 위치하게 되면 최대 다이버시티 이득을 얻을 수 있다. 뿐만 아니라 본 논문에서는 최대 다이버시티 이득을 얻으면서 릴레이의 전송파워를 최소화하는 위치를 정하므로 최대 다이버시티 이득을 얻는 다는 전제하에서 전체 시스템이 최소의 파워를 사용할 수 있도록 한다. 이를 입증하기 위해 본 논문은 전체 오류 확률의 분석과 모의실험들을 수행 한다.

디지털 오디오 코덱을 위한 새로운 비선형 역 양자화 알고리즘과 하드웨어 구조 (New Non-linear Inverse Quantization Algorithm and Hardware Architecture for Digital Audio Codecs)

  • 문종하;백재현;선우명훈
    • 한국통신학회논문지
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    • 제33권1C호
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    • pp.12-18
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    • 2008
  • 본 논문은 디지털 오디오 코덱에 효율적으로 적용 가능한 새로운 역 양자화 테이블 보간 알고리즘과 알고리즘에 특화된 DSP(Digital Signal Processor) 명령어 및 하드웨어 구조를 제안한다. 비선형 역 양자화 알고리즘은 대표적으로 MPEG-1 Layer-3와 MPEG-2/4 AAC(Advanced Audio Coding)에서 사용되며, 제안하는 명령어는 비선형 역 양자화에 최적화 되어 있다. 제안하는 알고리즘은 연산의 복잡도를 최소화하여 구현 시전체 연산량을 줄일 수 있으며, 제안된 알고리즘은 타 알고리즘에 비해 우수한 평균 오차값을 나타낸다. 제안하는 명령어 및 하드웨어 구조는 기존의 알고리즘과 비교하여 연산 과정에서 사용되는 명령어 수를 20% 정도 줄일 수 있으며, 역 양자화의 계산 부하를 효율적으로 줄일 수 있다. 제안한 알고리즘은 일반 상용 DSPEE 구현이 가능하다.

XY 스캐너의 아베 오차 최소화를 위한 최적 설계 및 나노 정밀도의 원자 현미경 피치 측정 불확도 평가 (Optimal design of a flexure hinge-based XY AFM scanner for minimizing Abbe errors and the evaluation of pitch measuring uncertainty of a nano-accuracy AFM system)

  • 김동민;이동연;권대갑
    • 한국정밀공학회지
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    • 제23권6호
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    • pp.96-103
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    • 2006
  • To establish of standard technique of nano-length measurement in 2D plane, new AFM system has been designed. In the long range (about several tens of ${\mu}m$), measurement uncertainty is dominantly affected by the Abbe error of XY scanning stage. No linear stage is perfectly straight; in other words, every scanning stage is subject to tilting, pitch and yaw motion. In this paper, an AFM system with minimum offset of XY sensing is designed. And XY scanning stage is designed to minimize rotation angle because Abbe errors occur through the multiply of offset and rotation angle. To minimize the rotation angle optimal design has performed by maximizing the stiffness ratio of motion direction to the parasitic motion direction of each stage. This paper describes the design scheme of full AFM system, especially about XY stage. Full range of fabricated XY scanner is $100{\mu}m\times100{\mu}m$. And tilting, pitch and yaw motion are measured by autocollimator to evaluate the performance of XY stage. As a result, XY scanner can have good performance. Using this AFM system, 3um pitch specimen was measured. The uncertainty of total system has been evaluated. X and Y direction performance is different. X-direction measuring performance is better. So to evaluate only ID pitch length, X-direction scanning is preferable. Its expanded uncertainty(k=2) is $\sqrt{(3.96)^2+(4.10\times10^{-5}{\times}p)^2}$ measured length in nm.

소매점 공급사슬에서 공급자주도 재고/분배 문제를 위한 발견적 해석 (A Heuristic for Vendor-managed Inventory/Distribution Problems in the Retail Supply Chain)

  • 홍성철;박양병
    • 경영과학
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    • 제25권1호
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    • pp.107-121
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    • 2008
  • As to more efficiently manage the inventory in the retail supply chain and to meet the customer demand in a timely manner, vendor-managed inventory (VMI) has been widely accepted, which manages inventory in the retail supply chain via sharing information and collaborating with the retailers. Applying VMI generates vendor-managed inventory/distribution problem (VMIDP), which involves inventory management for both the vendor and the retailers, and the design of vehicle routes for delivery, to minimize the total operating cost in the supply chain. In this paper, we suggest a mixed integer programming (MIP) model to obtain the optimal solution for VMIDP in a two-echelon retail supply chain, and develop an efficient heuristic based on the operating principles of the MIP model. To evaluate the performance of the heuristic, its solution was compared with the one of the MIP model on a total of twenty seven test problems. As a result, the heuristic found optimal solutions on seven problems in a significantly reduced time, and generated a 4.3% error rate of total cost in average for all problems. The heuristic is applied to the case problem of the local famous franchise company together with GIS, showing that it is capable of providing a solution efficiently in a relatively short time even in the real world situation.