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A Study on CSS3 Stylesheet Extension and Emulator for Representation of Stereo Web Content in 3DTV (3DTV에서 스테레오 웹 콘텐츠 표현을 위한 CSS3 사양 확장 및 에뮬레이터 연구)

  • Lee, Hee-Jin;Yim, Hyun-Jeong;Lim, Soon-Bum
    • Journal of the Korea Computer Graphics Society
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    • v.19 no.4
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    • pp.1-11
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    • 2013
  • In this paper, we represented the HTML5 webpage in 3D space for the 3D stereoscopic display by using CSS3 stylesheet; browser-based declarative contents, and proposed CSS Stereo 3DTV Profile. First, we suggested various webpage separation methods for reconstructing webpages in the 3D space effectively. Next, we suggested 3D view volume setting method by using extended CSS3 modules. And then, pre-processor converts sample contents which is written extended CSS stylesheet into the present CSS stylesheet for displaying in the webkit based browser. For the resulting stereoscopic images, we developed a rendering engine emulator which is implemented in JavaScript for simple display in the web browser, which produced dual images from virtual left and right-eyed cameras. And we have checked the sample contents displayed on the 3DTV.

Design and fabrication of multi-band six-port phase correlator using metamaterial (메타물질 구조 다중대역 6단자 위상상관기 설계 및 제작)

  • Kim, Young-Wan
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.14 no.12
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    • pp.2615-2621
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    • 2010
  • The multi-band six-port phase correlator using metamaterial was designed and fabricated in this paper. The lumped metamaterial structure that can process the dual-band receiving signal was analyzed. Based on the analyzed results, the small-sized metamatrial six-port phase correlator for multi-band direct conversion method was proposed and fabricated. Also, the resistive power divider and $90^{\circ}$ hybrid coupler that comprises the six-port phase correlator were implemented based on the scattering parameters of metamatrial six-port phase correlator. The measured results of the proposed six-port phase correlator show the good agreement with simulation results. The performance of the six-port phase correlator shows the reflection loss below -20 dB in the dual-band. Also, the proposed six-port phase correlator got a good transmission characteristic within 1 dB gain difference and ${\pm}4.1^{\circ}$ phase imbalance, respectively.

Domain Adaptation Method for LHMM-based English Part-of-Speech Tagger (LHMM기반 영어 형태소 품사 태거의 도메인 적응 방법)

  • Kwon, Oh-Woog;Kim, Young-Gil
    • Journal of KIISE:Computing Practices and Letters
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    • v.16 no.10
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    • pp.1000-1004
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    • 2010
  • A large number of current language processing systems use a part-of-speech tagger for preprocessing. Most language processing systems required a tagger with the highest possible accuracy. Specially, the use of domain-specific advantages has become a hot issue in machine translation community to improve the translation quality. This paper addresses a method for customizing an HMM or LHMM based English tagger from general domain to specific domain. The proposed method is to semi-automatically customize the output and transition probabilities of HMM or LHMM using domain-specific raw corpus. Through the experiments customizing to Patent domain, our LHMM tagger adapted by the proposed method shows the word tagging accuracy of 98.87% and the sentence tagging accuracy of 78.5%. Also, compared with the general tagger, our tagger improved the word tagging accuracy of 2.24% (ERR: 66.4%) and the sentence tagging accuracy of 41.0% (ERR: 65.6%).

Font Classification of English Printed Character using Non-negative Matrix Factorization (NMF를 이용한 영문자 활자체 폰트 분류)

  • Lee, Chang-Woo;Kang, Hyun;Jung, Kee-Chul;Kim, Hang-Joon
    • Journal of the Institute of Electronics Engineers of Korea CI
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    • v.41 no.2
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    • pp.65-76
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    • 2004
  • Today, most documents are electronically produced and their paleography is digitalized by imaging, resulting in a tremendous number of electronic documents in the shape of images. Therefore, to process these document images, many methods of document structure analysis and recognition have already been proposed, including font classification. Accordingly, the current paper proposes a font classification method for document images that uses non-negative matrix factorization (NMF), which is able to learn part-based representations of objects. In the proposed method, spatially total features of font images are automatically extracted using NMF, then the appropriateness of the features specifying each font is investigated. The proposed method is expected to improve the performance of optical character recognition (OCR), document indexing, and retrieval systems, when such systems adopt a font classifier as a preprocessor.

The Design of Process-Engine for Distributed Workflow Management System based on Web (웹기반 분산워크플로우 관리시스템의 프로세스 엔진 설계)

  • Lee, Heon;Park, Kyoo-Seok
    • Journal of Korea Multimedia Society
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    • v.4 no.5
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    • pp.377-389
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    • 2001
  • It has a tendency to build Workflow Systems based on the web with the spread of web environment. The important function in Workflow Systems are to automatize job flow according to the predefined regulations, procedures or conditions. Hence, there needs to consider excluding passive jobs, supporting GUI and a migratory information processing for information flow. Distributed Workflow System for workflow of a distributed service system should perform transfer control and Fault-Tolerance between tasks based on process logic, and real time processing. However, the existing mail systems being used are just for transmission and it doesn't fit to automatize job flow. To solve the matter, there needs a Distributed Workflow Engine to design workflow and automatize its control. In this paper, we design a web browser with graphic interface using web mail, a browser creating a script code for a procedural performance. Also, we design a Process-engine has a Preprocessor which tolerates process scheduler for task transaction or server node's faults on distributed environment. The proposed system enhances the reliability and usability of a system reduces the cost rather than a workflow system based on database, for they execute as proxy for a server's fault or suers' absence.

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Acoustic Echo Canceller for Stereophonic Tele-conferencing System. (스테레오 원거리회의 시스템을 위한 음향 반향 제거기)

  • Jeong, Kyu-Hwa;Lee, Won-Cheol;Youn, Dae-Hee;Cha, Il-Hwan
    • The Journal of the Acoustical Society of Korea
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    • v.16 no.3
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    • pp.57-63
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    • 1997
  • This paper proposes a new stereophonic acoustic echo canceller to preven the performance degradation at the instant of far-end talker's movement or change in transmission room environment in stereophonic teleconferencing system. In stereophonic acoustic echo canceller, the filter coefficients of the adaptive filters for echo cancellation do not have unique solutions and not converge to their optimum values. Therefore, the change of the far-end transmission room environment leads to degradation of ERLE(Echo Return Loss Enhanceement). Moreover, their computational complexity increases as the number of the filter coefficient increases, and their adaptive filters converge very slowly. So the real-time implementation is very difficult. To overcome these problems we propose a pre-processor consisting of an adaptive filter for making pseudo stereophonic signal, and it results in improved performance at the instant of environment change at far-end side and reduction of the total complexity.

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Study on the pre-processors to improve the generalized-cross-correlation based time delay estimation under the narrow band single tone signal environments (협대역 단일 주파수 신호 환경에서 일반 상호 상관 시간 지연 추정 향상을 위한 전처리기 연구)

  • Lim, Jun Seok;Kim, Seongil
    • The Journal of the Acoustical Society of Korea
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    • v.39 no.3
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    • pp.207-215
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    • 2020
  • There are several methods for the time delay estimation between signals to two receivers. Among these methods, Generalized Cross Correlation (GCC), which estimates the relative delay from the cross-correlation between the different signals at the two receivers, is a traditionally well-known method. However, when using a narrow band Continuous Wave (CW) signal, the GCC method degrades the estimation performance from relatively higher signal-to-noise ratio than when using a wideband signal. To improve this phenomenon, this paper examines four different pre-processors for GCC using narrow band single frequency signals. Simulation shows that the performance gain of the preprocessed GCC is up to 9 dB for a 100 msec CW signal as well as up to 4 dB for a 1 s CW signal.

Evaluation of Pitch Pine for Bioethanol Production by Organosolv Pretreatment (Organosolv 전처리를 통한 리기다소나무의 바이오에탄올 생산 적용성 평가)

  • Youe, Won-Jae;Kim, Yong Sik;Kang, Kyu-Young
    • Journal of Korea Technical Association of The Pulp and Paper Industry
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    • v.47 no.4
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    • pp.21-29
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    • 2015
  • In this study, the feasibility of utilizing wood chips from pitch pine (Pinus rigida) was evaluated for bioethanol production by an organosolv pretreatment and enzymatic saccharification. When wood chips from pitch wood were pretreated with 75% (v/v) ethanol and 1.7% sulfuric acid as a catalyst at H-factor 2000, average pulp yield was 43.3%, which pretreated wood fibers showed higher glucan (55.8%) and lower lignin (12.2%) contents than untreated control (43.9% glucan and 27.8% lignin). After enzymatic saccharification, the organosolv pulps with 56.2% delignification rate reached above 97% conversion rate of cellulose to glucose. These results indicated that increasing the delignification rate causes micro pores on the surface of organosolv pulps resulting in improved the accessibility of enzyme onto the substrate. Moreover, it was in agreement with the SEM examination of wood fibers.

A Fundamental Study for Pre-harvest Treatment System with an Onion Stem Cutter and a Plastic Mulch Wrapper (줄기 절단 및 비닐수거 기능을 가진 양파수확 전처리기 기초 연구)

  • Lee, Seungyun;Han, Cheolwoo;Park, Hyoje;Kweon, Giyoung
    • Journal of agriculture & life science
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    • v.52 no.5
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    • pp.151-162
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    • 2018
  • Mechanization of onion cultivation is essential to increase the competitiveness of onion cultivation farms. Onion stem cutting work requires 20.7hr/10a among the entire labor input time. In particular, 76% of the harvesting work depends on human labor. Digging and collection for onion cultivation has been partially mechanized, but few researches were implemented for stem cutters. No machine has been developed for stem cutting on the plastic mulching cultivation. The tensile force of the low-density polyethylene film used for agricultural mulching is reduced to 90% of the original force. Thus, mulching film collecting process was difficult because it was easily torn. To develop a combined onion stem cutter and plastic mulch lifter, stem cutting length based on moisture content in onion, the shape of blade, blade angle, the tensile force of plastic mulch, and the penetration resistance were investigated. The results showed that the less cutting resistance becomes the higher moisture content in onion and the longer stem cutting length become. Also, the cutting resistance was the lowest at the condition of the blade scope of $30^{\circ}$ and the blade angle of $20^{\circ}$ among variation levels for parameter effects test. The plastic mulch vinyl had the tensile force of 27.99 N, which is hardly tearing in its removal process, might be appropriate in onion cultivation. By the analyses of the penetration resistance of the guide, the guide angle of $40^{\circ}$ with the average resistance of 2.26 N was appropriate.

Chemical·Structural characterization of lignin extracted from Pitch Pine with Ionic Liquid (1-ethyl-3-methylimidazolium acetate)Pine with Ionic Liquid (1-ethyl-3-methylimidazolium acetate) (이온성액체(1-ethyl-3-methylimidazolium acetate)로 추출한 리기다소나무(pitch pine) 리그닌의 화학·구조 특성)

  • Kim, Jae-Young;Kim, Tae-Seung;Hwang, Hye-Won;Oh, Shin-Young;Choi, Joon-Weon
    • Journal of the Korean Wood Science and Technology
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    • v.40 no.3
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    • pp.194-203
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    • 2012
  • 1-Ethyl-3-methylimidazolium acetate known as efficient biomass pretreatment reagent was used for the extraction of lignin from rigida pine wood (pitch pine), which was called to ionic liquid lignin (ILL), and chemical structural features of ILL were compared with the corresponding milled wood lignin (MWL). The amounts of phenolic hydroxyl groups (Phe-OH) was determined to 10.0% for ILL and 7.2% for MWL, respectively, where those of methoxyl groups (OMe) were 4.9% for ILL and 11.0% for MWL, respectively. The weight average molecular weight (Mw) of ILL (3,995) were determined to ca. 1/2 of that of MWL (8,438) and polydispersity index (PDI: Mw/Mn) suggested that the lignin fragments were more uniform in the ILL (PDI 1.36) than in the MWL (PDI 2.64). The temperature (Tm) corresponding to maximum decomposition rate (Vm) of ILL ($306.6^{\circ}C$) was ca. $35^{\circ}C$ lower than that of MWL ($341.9^{\circ}C$), suggesting that ILL was thermally unstable than MWL, as evidence from the lower Tm for ILL. Moreover, the structural characteristics of ILL and MWL were confirmed by spectroscopic analyses (FT-IR and $^{13}C$-NMR), and these results indicated ionic liquid (1-ethyl-3-methylimidazolium acetate) was chemically or physically bound to ILL.