• Title/Summary/Keyword: DOM Model

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News Abusing Inference Model Using Web Crawling (웹크롤링을 활용한 뉴스 어뷰징 추론 모델)

  • Chung, Kyoung-Rock;Park, Koo-Rack;Chung, Young-Suk;Nam, Ki-Bok
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2018.07a
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    • pp.175-176
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    • 2018
  • 기존 신문이나 티브이가 아닌 온라인과 모바일로 뉴스를 보는 사람이 더 많아지면서, 포털 사이트 뉴스난에 다른 언론사의 기사보다 더 많이 노출되기 위한 경쟁의 심화로 뉴스 어뷰징은 심각한 사회 문제로까지 대두되었다. 본 논문은 온라인상에서 생성, 유통되는 많은 뉴스 중에서 이용자의 시간을 낭비하고 양질의 정보를 찾기 힘들게 하는 뉴스 어뷰징을 판단하는 모델을 제안한다. 제안된 모델은 크롤링 기술을 사용하여 뉴스의 제목과 내용을 가져온 후 인공지능 기술을 이용한 유사도 검사로 기사의 어뷰징 여부를 판단하여 양질의 뉴스 정보를 사용자에게 제공될 수 있다.

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Numerical Study on Pulverized Coal Combustion Applying Two-Phase WSGGM (이상 회체가스 가중합산모델을 적용한 미분탄 연소의 수치적 연구)

  • Yu, Myoung-Jong;Kang, Shin-Jae;Baek, Seung-Wook
    • Transactions of the Korean Society of Mechanical Engineers B
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    • v.24 no.10
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    • pp.1368-1379
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    • 2000
  • A numerical study on swirling pulverized coal combustion in an axisymmetric enclosure is carried out by applying the 2-phase weighted sum of gray gases model (WSGGM) approach with the discrete ordinate method (DOM) to model the radiative heat transfer equation. In the radiative transfer equation, the same polynomial equation and coefficients for weighting factors as those for gas are adopted for the coal/char particles as a function of partial pressure and particle temperature. The Eulerian balance equations for mass, momentum, energy, and species mass fractions are adopted with the standard and RNG k-${\varepsilon}$ turbulence model, whereas the Lagrangian approach is used for the particulate phase. The eddy-dissipation model is employed for the reaction rate for gaseous mixture, and the single-step and two-step first-order reaction model for the devolatilization process for coal. Special attention is given to establish the thermal boundary conditions on radiative transfer equation By comparing the numerical results with experimental ones, the radiation model used here is confirmed and found to provide an alternative for simulating the radiative transfer.

ESTIMATION OF IOP FROM INVERSION OF REMOTE SENSING REFLECTANCE MODEL USING IN-SITU OCEAN OPTICAL DATA IN THE SEAWATER AROUND THE KOREA PENINSULA

  • Moon, Jeong-Eon;Ahn, Yu-Hwan;Ryu, Joo-Hyung;Yang, Chan-Su
    • Proceedings of the KSRS Conference
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    • v.1
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    • pp.224-227
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    • 2006
  • For estimation of three inherent optical properties (IOPs), the absorption coefficients for phytoplankton ($a_{ph}$) and suspended solid particle ($a_{ss}$) and dissolved organic matter ($a_{dom}$), from ocean reflectance, we used inversion of remote sensing reflectance model (Ahn et al., 2001) at this study. The IOP inversion model assumes that (1) the relationship between remote sensing reflectance ($R_{rs}$) and absorption (a) and backscattering ($b_{b}$) is well known, (2) the optical coefficients for pure water ($a_{w}$, $b_{bw}$) are known, (3) the spectral shapes of the specific absorption coefficients for phytoplankton ($a^*_{ph}$) and suspended solid particle ($a^*_{ss}$) and the specific backscattering coefficients for phytoplankton ($b_b^*_{ph}$) and suspended solid particle ($b_b^*_{ss}$) are known. The input data of IOP inversion model is used in-situ ocean optical data at the seawater around the Korea Peninsula for 5 years (2001-2005). We compared the output data of the IOP inversion model and the in-situ observation for seawater around the Korea Peninsula.

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A Design and Implementation of Automated Builder of Web Application on Model 2 Framework (Model 2 프레임웍 기반 웹 애플리케이션 자동 생성 빌더 설계 및 구현)

  • Kweon, Ki-Hyeon;Cheon, Sang-Ho;Choi, Hyung-Jin
    • Proceedings of the Korea Information Processing Society Conference
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    • 2002.11c
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    • pp.1983-1986
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    • 2002
  • 분산 인터넷 환경에서 웹 애플리케이션의 상호운영성, 유연성, 확장성, 유지보수성 재사용성을 높이기 위해서 프레임웍 및 패턴을 시스템 개발에 적용하는 연구가 진행되고 있다. 프레임웍 및 패턴을 사용하여 시스템을 개발하기 위해서는 여러 가지 설비(facility)를 요구하며 개발자는 시스템에 대해 보다 많은 부분을 고려해야 한다. 본 논문에서는 특정 도메인에서 MVC Model 2 프레임웍을 기반으로 하는 시스템에 대해 공통으로 사용 가능한 코드를 재사용할 수 있도록 시스템의 골격 코드 및 프로토타입 형태의 시스템을 자동 생성하는 빌더를 설계하고 구현한다. 생성되는 프로토타입 시스템에서는 커스텀 태그 및 재사용 가능한 빈을 정의하고 XML, DOM, 국제화, 지역화 등을 지원하도록 작성되어 커스텀 태그 및 빈의 추가 및 변경에 의해 웹 애플리케이션의 기능을 변경시키고 성능을 향상시키는 것이 용이하게 된다. 본 연구에서 설계하고 구현한 Model 2 기반 프로토타입 자동생성 도구는 웹 애플리케이션 개발시에 활용되어 생산성 향상에 기여할 수 있다.

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Seismic Response Analysis of Dam-Reservoir System Using Transmitting Boundary (전달경계를 이용한 댐-호소 계의 지진응답해석)

  • 조정래
    • Journal of the Earthquake Engineering Society of Korea
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    • v.3 no.1
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    • pp.123-132
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    • 1999
  • One of the major difficulties in the seismic analysis of a dam-reservoir system is the treatment of the energy radiation in the upstream direction of the reservoir. In the paper, a new transmitting boundary is presented that can model properly the radiation of energy in the far field direction of a semi-infinite reservoir with constant depth. In the newly developed method, effects of surface wave motion are taken into accounted and the reservoir-foundation interaction is approximately accounted for with an absorbing boundary condition. If a dam has vertical upstream face and the infinitely long reservoir maintains constant depth, then the proposed transmitting boundary can be directly coupled with the model of dam body. In present study, the dam body is assumed to behave elastically and modeled by finite element method. Seismic responses of a dam model are investigated using the newly developed transmitting boundary.

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A Study of Thermal and flow Characteristics Induced by Fire in a Partial Enclosure (부분밀폐공간내에서 화재로 야기되는 열 및 유동특성에 관한 연구)

  • 박희용;한철희;박경우
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.18 no.5
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    • pp.1288-1300
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    • 1994
  • Mathematical modeling and numerical calculation on the flow and thermal characteristics induced by fire in a partial enclosure are performed. The solution procedures include the Shvab-Zeldovich approximation for the physical transport equations, low Reynolds number k-.epsilon. model for the turbulent fluid flow and Discrete Ordinate method(DOM) to calculate the radiative heat transfer. PMMA(Polymethylmethacrylate) is adopted as a solid fuel. Two different cases are considered : combustions with and without gas radiation occuring in a open cavity for variable pyrolyzing location of PMMA. When the fire source is located at the left-wall, the flow region of flame gas is limited at the left-wall and ceiling and recirculation region of inlet gas is formulated at neat the floor. In case of neglecting the radiative heat transfer, more large flame size and higher temperature is predicted. It is essential to consider the radiative heat transfer for analysis of fire phenomenon.

A Study on Combined Heat Transfer in a Enclosure with a Block (밀폐공간내의 피가열체 존재시 복합열전달에 관한 연구)

  • Hong, Seong-Kook;Ryou, Hong-Sun;Hong, Ki-Bae;Chae, Soo
    • Journal of the Korean Society of Safety
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    • v.15 no.1
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    • pp.19-27
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    • 2000
  • This paper numerically deals with combined heat transfer in a enclosure with a block. The block affected by hot wall is located centrally in the enclosure with a radiating gray gas. The discrete ordinate method(DOM) was used for solving the radiative transfer equation. Both laminar and turbulent cases were investigated for various Rayleigh number and standard k-$\varepsilon$ model was adopted to turbulent case. The effects of optical thickness, wall emissivity and fluid-solid thermal conductivity ratio are investigated on the flow and temperature fields. This study shows that as the wall emissivity decreases, the temperature distribution gradually becomes uniform and the heat transfer is reduced in enclosure. It is expected that this study can help to design the energy system related to the combined heat transfer and operate it safely.

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An XPath Query Processing System based on JXTA (JXTA 기반의 XPath 질의 처리 시스템)

  • Lee, Ji-Hun;Sohn, Ki-Rack
    • Proceedings of the Korea Information Processing Society Conference
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    • 2003.05c
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    • pp.1607-1610
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    • 2003
  • 최근 MP3 저작권에 대한 찬반 논란이 계속 되면서, 기존의 클라이언트-서버가 아닌 Peer-To-Peer(P2P) 기반의 데이터 검색 시스템에 관한 여러 연구가 활발히 진행되고 있다. 하지만. 검색 방법에 있어서는 단순히 파일이름을 이용한 데이터 검색 방법이 주류를 이루고 있는데 본 논문에서는 검색을 위한 문서 정보를 XML 형태로 저장하고, 구조적인 검색을 용이하게 하기 위해 DOM(Document Object Model)을 이용하여 XML 문서를 트리 형태로 구성한 후 P2P 네트워킹 플랫폼인 JXTA를 기반으로 XPath 질의를 수행함으로써 P2P 네트워크 기반에서 구조적 검색이 가능한 시스템을 구현하였다.

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Homepage ASP Service Model based on the Web Accessibility (웹 접근성 준수 홈페이지 ASP 서비스 모델)

  • Tak, Jin-Hyun;Kang, Kwang-Sik;Lee, Se-Hoon
    • Proceedings of the Korean Society of Computer Information Conference
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    • 2011.06a
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    • pp.39-41
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    • 2011
  • 웹 접근성이란 '어떠한 사용자(장애인, 노인 등)'가 어떠한 기술 환경에서도 사용자가 전문적인 능력 없이 웹 사이트에서 제공하는 모든 정보에 접근할 수 있도록 보장하는 것이다. 그러나 홈페이지 구축 비용 등의 문제로 장애인 관련 단체나 학교 등 가장 필요한 사이트 조차 접근성을 준수하고 있지 못하다. 따라서, 저비용으로 쉽게 웹 접근성 준수 학교 홈페이지를 구축할 수 있는 ASP(Application Service Provider) 서비스 모델을 제안한다. 제안된 서비스는 HTML/XHTML 표준에 맞게 올바른 마크업 언어를 사용하고, CSS를 통해 구조와 표현을 완전 분리하여 개발하여 웹 접근성의 기본이 되는 웹 표준을 준수하였으며, 표준 지원 브라우저들과 모바일 웹 환경의 종류와 특성을 이해하고 이를 바탕으로 브라우저 간 상호 운용성을 보장하기 위해 자바 스크립트를 표준 문법과 구조에 맞게 사용하고, W3C의 표준 DOM을 이용하여 홈페이지에 필요한 기능들을 설계하였다.

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A Study on the Radiation Effect of the Smoke Movement in Room Fires

  • Jeong, Jin-Yong;Ryou, Hong-Sun
    • International Journal of Air-Conditioning and Refrigeration
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    • v.10 no.3
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    • pp.162-175
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    • 2002
  • To investigate smoke movement with radiation in a room fires, a numerical and experi-mental analysis were performed. In this paper, results from a field model based on a self-developed SMEP (Smoke Movement Estimating Program) were compared with Stockier's ex-periment and the experiments on various sized pool fires in a room with door The SMEP using PISO algorithm solves conservation equations for mass, momentum, energy and species, together with those for the modified k- $\varepsilon$ turbulence model with buoyancy term. Also it solves the radiation equation using the S-N discrete ordinates method (DOM). The result of the cal-culated smoke temperature considering radiation effect has shown good agreement compared with the experimental data, although there are large discrepancy in the hot smoke layer be-tween the temperature predicted by the SMEP with only convection effect and obtained by the experimental result. This large discrepancy is caused from the radiation effect of $H_2O$ and $CO_2$ gas under smoke productions. Hence the radiation effect under smoke in fire is the point to be specially considered in order to produce more realistic result.