• 제목/요약/키워드: 이차원

검색결과 1,191건 처리시간 0.032초

Crystal Structure of Two-Dimensional Bis(isonicotinato)tet-raaquazinc(II) Complex Linked by Hydrogen-Bonds (수소 결합에 의한 이차원의 Bis(isonicotinato)tetraaquazinc(II) 착물의 결정구조)

  • Park, Ki-Young;Kim, Moon-Jip;Suh, Il-Hwan
    • Korean Journal of Crystallography
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    • 제13권1호
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    • pp.17-20
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    • 2002
  • The complex [Zn(L)₂(H₂O)₄] (1) (L = isonicotinate) has been prepared and characterized by X-ray crystallography. Compound 1 crystallizes in the triclinic space group P1, with a = 6.9062(4) , b = 9.2618(7) , c = 6.3313(3) , α = 104.986(6)°, β = 112.865(4)°, γ = 96.213(6)°, V = 350.41(4) , Z = 1, R₁(wR₂) for 1225 observed reflections of [I > 2σ(I)] was 0.0209 (0.0591). The coordination environment of the zinc atom can be described as an octahedron in which the isonicotinato ligands are mutually trans. Compound 1 is also connected into a two-dimensional chain via hydrogen-bonds.

Two-Dimensional Dimming Algorithm using Light Spread Function (빛 확산 함수를 이용한 이차원 디밍 알고리즘)

  • Jung, Hye-Dong;Kang, Sung-Jin
    • The Journal of Korean Institute of Communications and Information Sciences
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    • 제35권8B호
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    • pp.1204-1210
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    • 2010
  • In this paper, in order to reduce the power consumption of LCD TV, we present a two-dimensional dimming algorithm for LED BLU(Backlight Unit) using light spread function and a pragmatic implementation method. In conventional two dimensional dimming algorithms, LED BLU is divided into MxN blocks and proper backlight luminance for each block is computed according to input image and used for dimming control. But, LED light of each block is diffused and affects the neighboring blocks so that luminance of each block becomes larger than that of intent. In the proposed algorithm, dimming control values are reduced by the amount of quantity affected by the neighboring blocks using light spread function, resulting in additional reduction of power consumption.

Researach Patterns of Information Retrieval in Information Science: The Changing Structure Across A Decade (정보검색분야의 지적 구조와 변화에 관한 연구 : 영어문화권 저자들을 중심으로)

  • 서은경
    • Journal of the Korean Society for information Management
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    • 제9권1호
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    • pp.55-82
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    • 1992
  • It can be assumed that exciting improvements of technology concerning the ways in which information is stored and processed have significantly affected information science and may lead to a dramatic change of research in the field. Author co-citation analysis was used to investigate changes in research patterns of information retrieval over two time periods, 1980-1982, and 1988-1990. Nonmetric multidimensional scaling and clustering techiqes were used to create two dimensional maps displaying the changing research patterns among 22 authors as perceived by scholars citing their work over the two time periods. The co-cited author clusters and the placement of authors on the two maps both appear to correspond well with characterizations of the author's work obtained in texts and social relationships.

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Analysis of Channel Doping Concentration Dependent Subthreshold Characteristics for Double Gate MOSFET (이중게이트 MOSFET에서 채널도핑농도에 따른 문턱전압이하 특성 분석)

  • Jung, Hak-Kee
    • Journal of the Korea Institute of Information and Communication Engineering
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    • 제12권10호
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    • pp.1840-1844
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    • 2008
  • In this paper, the influence of channel doping concentration, which the most important factor is as double gate MOSFET is fabricated, on transport characteristics has been analyzed in the subthreshold region. The analytical model is used to derive transport model based on Poisson equation. The thermionic omission and tunneling current to have an influence on subthreshold current conduction are analyzed, and the relationship of doping concentration and subthreshold swings of this paper are compared with those of Medici two dimensional simulation, to verify this model. As a result, transport model presented in this paper is good agreement with two dimensional simulation model, and the transport characteristics have been considered according to the dimensional parameters of double gate MOSFET.

Cover song search based on magnitude and phase of the 2D Fourier transform (이차원 퓨리에 변환의 크기와 위상을 이용한 커버곡 검색)

  • Seo, Jin Soo
    • The Journal of the Acoustical Society of Korea
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    • 제37권6호
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    • pp.518-524
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    • 2018
  • The cover song refers to live recordings or reproduced albums. This paper studies two-dimensional Fourier transform as a feature-dimension reduction method to search cover song fast. The two-dimensional Fourier transform is conducive in feature-dimension reduction for cover song search due to musical-key invariance. This paper extends the previous work, which only utilize the magnitude of the Fourier transform, by introducing an invariant from phase based on the assumption that adjacent frames have the same musical-key change. We compare the cover song retrieval accuracy of the Fourier-transform based methods over two datasets. The experimental results show that the addition of the invariant from phase improves the cover song retrieval accuracy over the previous magnitude-only method.

Determinants of Secondary Traumatic Stress among Public Social Welfare Specialists (사회복지전담공무원의 이차적 외상스트레스 결정 요인)

  • Yang, Jung-Bin;Kim, Doe-Yoon;Ryu, Soon-Ok;Kim, Ja-Young
    • The Journal of the Korea Contents Association
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    • 제15권11호
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    • pp.115-125
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    • 2015
  • This study was to identify major risk factors associated with secondary traumatic stress in a sample of 654 public social welfare specialists. Findings indicated that 69.0% of the subjects experienced secondary traumatic stress, and 36.9% of them were in a high-risk group. Multiple regression analysis showed that the risk of the secondary traumatic stress was associated with gender, work hours, physical violence and threats from clients, coping strategies, and vocational self-efficacy. Based on these results, several interventions for preventing the incidence of secondary traumatic stress among public social welfare specialists are suggested as the follows: construction of secure job environment, development of educational programs for improving vocational self-efficacy and coping skills, and implementation of mental health screening system on a regular basis to prevent the outbreak of mental disease among the workers.

스터드 기반의 레이저 레이다 삼차원 영상센서기술

  • Min, Bong-Gi
    • Proceedings of the Korean Vacuum Society Conference
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    • 한국진공학회 2013년도 제44회 동계 정기학술대회 초록집
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    • pp.120-120
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    • 2013
  • 본 발표에서는 최근 무인전투기 및 무인자율주행차량 등의 어플리케이션에 응용되고 있는 삼차원 영상 센서 시스템 기술에 관한 소개와 더불어 한국전자통신연구원에서 독자적인 구도를 기반으로 최근 시연에 성공한 스터드(STUD) 레이저 레이다의 동작원리 및 구현결과를 소개하고자 한다. 최근 전세계의 삼차원 레이저 영상 센서 시스템은 1) 한 관측점을 회전을 통해 스캔하는 2D 스캔 방식에서 벗어나, 2) 일차원 배열 형태로 구현된 관측점을 센서가 회전하면서 얻어지는 3D 스캔 방식과 3) 이차원 어레이 형태의 검출기로 삼차원 영상을 검출하는 방식으로 삼차원 영상을 확보하는 노력으로 구분되어 진행되어 왔다. 이번 시연에 성공한 제안된 방법은, 기존의구도와는 다른 독자적인 방식으로, 대면적 검출기를 기반으로 센서부가 회전하지 않으면서, 하나로 통합된 검출기 출력을 이용할 수 있는 구도인 스터드(STUD: STatic and Unitary Detector)기반의 삼차원 레이저 레이다 시스템이다. 최근 구현 결과는 수평해상도 320, 수직해상도 240인 QVGA 영상 수준으로, 이는 지금까지 세계 최고해상도인 ASC사의 128x128 해상도를 뛰어 넘는 우수한 결과이다. 제안된독자적인 구도의 삼차원 레이저 영상 시스템은 다양한 관련 기술들과의 접목하여 향후 군수용 뿐만아니라 민수용 시장의 기술발전에 큰 영향을 미칠 것으로 예상되고 있다.

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Development of 2D Depth-Integrated Hydrodynamic and Transport Model Using a Compact Finite Volume Method (Compact Finite Volume Method를 이용한 수심적분형 흐름 및 이송-확산 모형 개발)

  • Kim, Dae-Hong
    • Journal of Korea Water Resources Association
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    • 제45권5호
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    • pp.473-480
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    • 2012
  • A two-dimensional depth-integrated hydrodynamic and a depth-averaged passive scalar transport models were developed by using a Compact Finite Volume Method (CFVM) which can assure a higher order accuracy. A typical wave current interaction experimental data set was compared with the computed results by the proposed CFVM model, and resonable agreements were observed from the comparisons. One and two dimensional scalar advection tests were conducted, and very close agreements were observed with very little numerical diffusion. Finally, a turbulent mixing simulation was done in an open channel flow, and a reasonable similarity with LES data was observed.

Assessment of Seismic Site Response at Hongseong in Korea Based on Two-dimensional Basin Modeling using Spatial Geotechnical Information (공간 지반 정보를 활용한 이차원 분지 모델링 기반의 국내 홍성 지역에서의 부지 지진 응답 평가)

  • Sun, Chang-Guk
    • The Journal of Engineering Geology
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    • 제19권1호
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    • pp.15-23
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    • 2009
  • The site effects relating to the amplification of ground motion under earthquake loading are strongly influenced by both the subsurface soil condition and geologic structure. In this study, the site effects at the Hongseong area in Korea were examined by both the site investigation including borehole drilling and in-situ seismic tests and the site visit for acquiring geologic information of ground surface. Subsurface of Hongseong area with a major instrumental earthquake event in 1978 is composed of weathered layers of a maximum of 45 m thickness overlying bedrock. A geotechnical information system based on GIS framework was implemented to effectively find out spatial geologic structure of study area and it indicated Hongseong is a shallow and wide shaped basin. Two-dimensional finite element (FE) analyses for a representative cross-section of the Hongseong area were performed to evaluate seismic site responses. From the results of seismic responses, it was observed that the ground motions were amplified during the propagation of shear waves through the soil layer overlying the bedrock and the duration of shaking near the basin edges was prolonged due to the surface waves generated by interactions of shear waves with basin geometry. Furthermore, one-dimensional FE seismic response analyses were additionally conducted for soil sites selected in the basin, and it gives similar results to the two-dimensional seismic responses at most locations in the basin with the exception of the locations near the basin edges, because the basin in this study is very shallow and wide.