• Title/Summary/Keyword: Ambiguity Elimination

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Analysis of success rate of GPS carrier phase ambiguity resolution in Korea peninsula

  • Soo, Son-Ji;In, Jee-Gyu
    • 제어로봇시스템학회:학술대회논문집
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    • 2001.10a
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    • pp.114.1-114
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    • 2001
  • GPS Receiver gives pseudorange Doppler and integrated carrier phase for measurements to compute navigation information. Thought the integrated carrier phase can be transfer to the equal domain as pseudorange by multiplying the wave length of the received signal, in order to get position information from the carrier phase measurements the integer ambiguity should be resolved. And differencing technique is generally used to eliminate the common error terms of the integrated carrier phase measurements between robber and server. In short baseline double-differencing operation has effect on elimination the common biases for both stations and thus ambiguity resolution are to be reliable. But the baseline increases, the integer ambiguity resolution is hardly, due to the correlated common error is increase ...

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An analysis on the Deconstructed Visage in Fashion Illustration - Based on the Deconstructed Visage of Francis Bacon's Painting - (패션 일러스트레이션에 나타난 얼굴해체 - 프란시스 베이컨 회화의 얼굴해체를 바탕으로 -)

  • Choi, Jung-Hwa;Choi, Yoo-Jin
    • Fashion & Textile Research Journal
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    • v.15 no.6
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    • pp.874-885
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    • 2013
  • This study analyzes the visage in fashion illustration based on the deconstructed visage of Francis Bacon's paintings as well as analyzes fashion illustration works since 2000. The deconstructed visages in Francis Bacon's paintings are classified as blurring, elimination, distortion and division. The expressive methods and meanings in fashion illustration (according to categorization) are as follow. Blurring shows an ambiguous visage organ by the sweeping of the brush, removal of a boundary among the visage, body and clothes, gradation of organic line like visage shapes, stretching of the a plat combined to visage and fragmentation of visage. It represents an uncertainty of the fashion theme and image interpretation, impossibility of figure by ambiguity, fantastic effect and the induction of the uncanny. Elimination shows the background color's painting of a photo-montage, overlap of a cutting of visage's part and background of a plat, elimination of the visage and the elimination of eyes, nose or lips. It represents a weakened identity, the reinforcement of anonymity, creation of a violent image, and uncanny unfamiliarity. Distortion shows a distorted visage by free drawing, and unconscious drawing line, fluid digital body, combination of an unconscious curve, and an eccentric combination of the accidental. It represents the relief of specialty about realistic existence, hypothetical immateriality and fantasy. Division shows overlapped visages with different angles, the weird combination of a plural visage and different species and a plural breakaway of direction, and the position of several organs. It represents motion by power's trace, non-territory of species, ambiguity and uncertainty and the uncanny.

Direction Finding Method of the Uniform Circular Array Antenna Using the Pattern of Phase Differences (원형배열 안테나의 위상차 패턴을 이용한 방향탐지 기법)

  • Lim, Joong-Soo
    • Journal of the Korea Convergence Society
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    • v.10 no.1
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    • pp.1-6
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    • 2019
  • In this paper, we have studied a direction finding method of the radio signal by comparing the phase difference and its pattern from the uniform circular array antenna. In the phase comparison direction finding, if the length of the antenna baseline is longer than 0.5 wavelength of the incident signal, azimuth ambiguity occurs in which two or more azimuth angles are calculated in the same phase difference. The azimuthal ambiguity is removed by fusing the phase difference of the 5 antennas. The developed ambiguity elimination technology reduces the azimuth error where the antenna baseline is shorter than 1.236 wavelength in the uniform circular array with five antennas. This algorithm is very useful for the design of direction finder of an electronic information system.

Novel Approach for Eliminating BER Irreducible Floor in the Enhanced Blind Cyclic Detection for Space-Time Coding

  • Pham, Van-Su;Le, Minh-Tuan;Mai, Linh;Kabir, S.M.Humayun;Yoon, Gi-Wan
    • Journal of information and communication convergence engineering
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    • v.6 no.2
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    • pp.150-153
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    • 2008
  • In the blind Maximum-likelihood (ML) detection for Orthogonal Space-Time Block Codes (OSTBC), the problem of ambiguity in determining the symbols has been a great concern. A possible solution to this problem is to apply semi-blind ML detection, i.e. the blind ML decoding with pilot symbols or training sequence. In order to increase the performance, the number of pilot symbols or length of training sequence should be increased. Unfortunately, this leads to a significantly decrease in system spectral efficiency. This work presents an approach to resolve the aforementioned issue by introducing a new method for constructing transmitted information symbols, in which transmitting information symbols drawn form different modulation constellations. Therefore, the ambiguity can be easily eliminated. In addition, computer simulation is implemented to verify the performance of the proposed approach.

Development of GPS-RTK Algorithm for Improving Geodetic Performance in Short Baseline (단기선 측지 성능 향상을 위한 GPS-RTK 알고리즘 개발)

  • Choi, Byung-Kyu;Lee, Sang-Jeong;Park, Jong-Uk;Baek, Jeong-Ho
    • Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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    • v.27 no.4
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    • pp.461-467
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    • 2009
  • Relative positioning technique by GPS that can obtain the high positioning accuracy has been used for generation of high precision positioning with elimination or the reduction of the common errors. This paper gives some algorithms for RTK and considers the filter to estimate the positioning information and integer ambiguities at each epoch in the whole algorithms. The extended kalman filter has been employed to estimate the state parameters and the modified LAMBDA to resolve the integer ambiguities. The data processing was performed by GPS single frequency and dual frequency in short baseline. The verification procedure of these positioning compared with results from Bernese 5.0 software. We presented some statistic values on positioning errors and the rates of integer ambiguity resolution.

Using Syntactic Unit of Morpheme for Reducing Morphological and Syntactic Ambiguity (형태소 및 구문 모호성 축소를 위한 구문단위 형태소의 이용)

  • Hwang, Yi-Gyu;Lee, Hyun-Young;Lee, Yong-Seok
    • Journal of KIISE:Software and Applications
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    • v.27 no.7
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    • pp.784-793
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    • 2000
  • The conventional morphological analysis of Korean language presents various morphological ambiguities because of its agglutinative nature. These ambiguities cause syntactic ambiguities and they make it difficult to select the correct parse tree. This problem is mainly related to the auxiliary predicate or bound noun in Korean. They have a strong relationship with the surrounding morphemes which are mostly functional morphemes that cannot stand alone. The combined morphemes have a syntactic or semantic role in the sentence. We extracted these morphemes from 0.2 million tagged words and classified these morphemes into three types. We call these morphemes a syntactic morpheme and regard them as an input unit of the syntactic analysis. This paper presents the syntactic morpheme is an efficient method for solving the following problems: 1) reduction of morphological ambiguities, 2) elimination of unnecessary partial parse trees during the parsing, and 3) reduction of syntactic ambiguity. Finally, the experimental results show that the syntactic morpheme is an essential unit for reducing morphological and syntactic ambiguity.

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2D/3D Visual Optical Inspection System for Quad Chip (Quad Chip 외관 불량 검사를 위한 2D/3D 광학 시스템)

  • Han, Chang Ho;Lee, Sangjoon;Park, Chul-Geon;Lee, Ji Yeon;Ryu, Young-Kee;Ko, Kuk Won
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.17 no.1
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    • pp.684-692
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    • 2016
  • In the manufacturing process of the LQFP/TQFP (Low-profile Quad Flat Package/Thin Quad Flat Package), the requirement of a 3 dimensional inspection is increasing rapidly and a 3D inspection of the shape of a chip has become an important report of quality control. This study developed a 3 dimensional measurement system based on PMP (Phase Measuring Profilometry) for an inspection of the LQFP/TQFP chip and image processing algorithms. The defects of the LQFP/TQFP chip were classified according to the dimensions. The 2 dimensional optical system was designed by the dorm illumination to achieve constant light distribution, In the 3 dimensional optical system, PZT was used for moving 90 degree in phase. The problem of 2 ambiguity was solved from the measured moir? pattern using the ambiguity elimination algorithm that finds the point of ambiguity and refines the phase value. The proposed 3D measurement system was evaluated experimentally.

Development of Elimination Method of Measurement noise to Improve accuracy for White Light Interferometry (백색광 간섭계의 정밀도 향상을 위한 노이즈 제거 방법)

  • Ko, Kuk-Won;Cho, Soo-Yong;Kim, Min-Young
    • Journal of Institute of Control, Robotics and Systems
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    • v.14 no.6
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    • pp.519-522
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    • 2008
  • As industry of a semiconductor and LCD industry have been rapidly growing, precision technologies of machining such as etching and 3D measurement are required. Stylus has been important measuring method in traditional manufacturing process. However, its disadvantages are low measuring speed and damage possibility at contacting point. To overcome mentioned disadvantage, non-contacting measurement method is needed such as PMP(Phase Measuring Profilometry), WSI(white scanning interferometer) and Confocal Profilometry. Among above 3 well-known methods, WSI started to be applied to FPD(flat panel display) manufacturing process. Even though it overcomes 21t ambiguity of PMP method and can measure objects which has specular surface, the measuring speed and vibration coming from manufacturing machine are one of main issue to apply full automatic total inspection. In this study, We develop high speed WSI system and algorithm to reduce unknown noise. The developing WSI and algorithm are implemented to measure 3D surface of wafer. Experimental results revealed that the proposed system and algorithm are able to measure 3D surface profile of wafer with a good precision and high speed.

Illegal Cash Accommodation Detection Modeling Using Ensemble Size Reduction (신용카드 불법현금융통 적발을 위한 축소된 앙상블 모형)

  • Lee, Hwa-Kyung;Han, Sang-Bum;Jhee, Won-Chul
    • Journal of Intelligence and Information Systems
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    • v.16 no.1
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    • pp.93-116
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    • 2010
  • Ensemble approach is applied to the detection modeling of illegal cash accommodation (ICA) that is the well-known type of fraudulent usages of credit cards in far east nations and has not been addressed in the academic literatures. The performance of fraud detection model (FDM) suffers from the imbalanced data problem, which can be remedied to some extent using an ensemble of many classifiers. It is generally accepted that ensembles of classifiers produce better accuracy than a single classifier provided there is diversity in the ensemble. Furthermore, recent researches reveal that it may be better to ensemble some selected classifiers instead of all of the classifiers at hand. For the effective detection of ICA, we adopt ensemble size reduction technique that prunes the ensemble of all classifiers using accuracy and diversity measures. The diversity in ensemble manifests itself as disagreement or ambiguity among members. Data imbalance intrinsic to FDM affects our approach for ICA detection in two ways. First, we suggest the training procedure with over-sampling methods to obtain diverse training data sets. Second, we use some variants of accuracy and diversity measures that focus on fraud class. We also dynamically calculate the diversity measure-Forward Addition and Backward Elimination. In our experiments, Neural Networks, Decision Trees and Logit Regressions are the base models as the ensemble members and the performance of homogeneous ensembles are compared with that of heterogeneous ensembles. The experimental results show that the reduced size ensemble is as accurate on average over the data-sets tested as the non-pruned version, which provides benefits in terms of its application efficiency and reduced complexity of the ensemble.

Deleuze's Deterritorialization Body without Organs in Contemporary Fashion -Focusing on Central Saint Martins, Royal College of Art, Antwerp Royal Academy of Fine Arts Graduation works- (현대 패션에 표현된 들뢰즈의 탈영토화와 기관 없는 신체 -영국 센트럴 세인트 마틴스 예술대학, 영국 왕립예술대학교, 벨기에 앤트워프 왕립예술대학의 2017-2019 줄업 작품을 중심으로-)

  • Wang, Xin-yu;Kim, Hyun-Joo
    • Journal of Digital Convergence
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    • v.18 no.12
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    • pp.549-563
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    • 2020
  • Based on Deleuze's body aesthetics and from the perspective of 'deterritoraliazation', this study makes an in-depth discussion on the modern fashion design modeling by four visual characteristics: hysteria, visualization, body segmentation and becoming animals. First, hysteria embodies the strong visual effect brought by the deformation and exaggeration of clothing. Second, visualization in fashion shows the elimination or ambiguity of faces, representing the weakening of identity and the prominence of clothing and body. Third, body segmentation represents the deconstruction and reorganization of clothing, and a new way of thinking, as well. Fourth, becoming-animals are manifested in the physical mutation caused by the heterogeneous connection between humans and animals, which brings about the possibility of rethinking the body.