• Title/Summary/Keyword: 근접관계

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Radar Rainfall Estimation Using Window Probability Matching Method : 1. Establishment of Ze-R Relationship for Kwanak Mt, DWSR-88C at Summer, 1998 (WPMM 방법을 이용한 레이더 강수량 추정 : 1. 1998년 여름철 관악산 DWSR-88C를 위한 Ze-R 관계식 산출)

  • Kim, Hyo-Gyeong;Lee, Dong-In;Yu, Cheol-Hwan;Gwon, Won-Tae
    • Journal of Korea Water Resources Association
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    • v.35 no.1
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    • pp.25-36
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    • 2002
  • Window Probability Matching Method(WPMM) is achieved by matching identical probability density of rain intensities and radar reflectivities taken only from small window centered about the gage. The equation of $Z_{e}-R$ relationship is obtained and compared with data between a DWSR-88C radar and high density rain gage networks within 150km from radar site in summer season, 1998. The probability density of radar effective reflectivity is distributed with high frequency near 15dBZ. The frequency distribution of rain intensities shows that rain intensity is lower than 10mm/hr in most part of radar coverage area. As the result of $Z_{e}-R$ relationship using WPMM, curved line has shown to the log scale spatially and it can be explained more flexible than any straight-line power laws at the transformation to the rainfall amount from $Z_e$ value. During 3 months, total radar cumulative rainfall amount estimated by $Z=200R^{1.6}$ and WPMM relationships are 44 and 80 percentages of total raingage amount, respectively. Therefore, $Z_{e}-R$ relationships by WPMM may be widely needed a statistical method for the computation of accumulated precipitation.

Relationship Between IFN${\gamma}$ Production, Antibody and Hormone Levels in Naturally Neospora caninum-infected Pregnant Dairy Cows (Neospora caninum에 자연 감염된 임신우에서 IFN${\gamma}$, 항체 및 호르몬 수준의 상관관계)

  • Son, Jeong-Hoon;Park, Bae-Keun;Son, Hwa-Young;Jung, Ju-Young;Park, Sang-Joon;Kim, Tae-Hwan;Cho, Sung-Whan;Ryu, Si-Yun
    • Journal of Veterinary Clinics
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    • v.27 no.6
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    • pp.640-646
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    • 2010
  • Neosporosis is a widespread parasitic disease caused by Neospora caninum, an intracellular protozoan parasite. It causes economic losses due to reproductive failure. The potential relationship between pregnancy outcomes and levels of IFN${\gamma}$, hormones, and antibodies in naturally N. caninum-infected cows was examined in the blood samples collected every 2 or 4 weeks in 26 pregnant cows from 4 different farms. The mean S/P value of seropositive nonaborting animals (n = 14) reached peak levels 15 weeks prior to parturition, and declined thereafter to parturition. The S/P value 13 weeks prior to abortion in seropositive aborting cows (n=3) remained at high levels, and abortions occurred at 20 (142 days), 26 (185 days), and 28 weeks (199 days) after artificial insemination. IFN${\gamma}$ levels in the seropositive non-aborting group varied by individuals and gestational periods; IFN${\gamma}$ levels stayed at elevated levels or increased abruptly close to abortion in seropositive aborting cows. IFN${\gamma}$ level patterns in the seronegative group (n = 9) were similar to the seropositive non-aborting group, although IFN${\gamma}$ amounts were lower than the seropositive group. The mean progesterone levels in the seropositive non-aborting and seronegative groups decreased markedly 7 weeks prior to parturition. The mean progesterone levels 5 and 7 weeks prior to abortion were lower than the other groups 5 and 7 weeks prior to parturition. The mean 17${\beta}$-estradiol levels in the seropositive aborting cows increased close to abortion; the produced amounts were lower than those of seropositive non-aborting and seronegative groups close to parturition. These results suggested that lower levels of progesterone and ${\beta}$-estradiol in Neospora-infected cows may lead to increases in IFN${\gamma}$ production and in turn may result in abortion.

Interpolation Technique for Dynamic Rain Attenuation Data (동적 강우 감쇠 데이터의 인터폴레이션 기법)

  • Sooyoung kim Shin;Soo In Lee;Yang Su Kim
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.25 no.3A
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    • pp.317-324
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    • 2000
  • In this paper, we propose an interpolation technique to rain attenuation data which represents dynamic characteristics by time variations. By using this technique, it is possible to sample the rain attenuation data at an arbitrary time interval, and thus it would play an important role in developing adaptive transmission scheme for countermeasuring rain attenuation. We propose the interpolation technique which can synthesizes rain attenuation data by extracting the most proper parameters required to emulate the dynamic characteristics of rain attenuation. Interpolation results to measured data of I minute time interval will be demonstrated, and it is shown that more exact performance evaluation of adaptive transmission scheme to countermeasure rain attenuation can be achieved.

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Human Action Recognition by Inference of Stochastic Regular Grammars (확률적 정규 문법 추론법에 의한 사람 몸동작 인식)

  • Cho, Kyung-Eun;Cho, Hyung-Je
    • Journal of KIISE:Computing Practices and Letters
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    • v.7 no.3
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    • pp.248-259
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    • 2001
  • This paper proposes a human action recognition scheme to recognize nonverbal human communications automatically. Based on the principle that a human body action can be defined as a combination of multiple articulation movements, we use the method of inferencing stochastic grammars to understand each human actions. We measure and quantize each human action in 3D world-coordinate, and make two sets of 4-chain-code for xy and zy projection plane. Based on the fact that the neighboring information among articulations is an essential element to distinguish actions, we designed a new stochastic inference procedure to apply the neighboring information of hands. Our proposed scheme shows better recognition rate than that of other general stochastic inference procedures. ures.

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The Authentication Framework in Access Network based on Home Gateway (홈 게이트웨이에 기반한 가입자망에서의 인증 프레임워크)

  • Yoon Hwa-Mook;Choi Byung-Sun;Lee Seoung-Hyeon;Lee Jae-Kwang;Lee Won-Goo
    • The Journal of the Korea Contents Association
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    • v.5 no.4
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    • pp.160-168
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    • 2005
  • Today, home networking security shows the complicated and various characteristics of requirements for consideration because of the variety of information appliances and share of resources among them. Therefore, security framework to satisfy with security functions is arranged ,regardless of the variety of communication medium and protocols. Thus, we construct security framework for mobile host(or user) to securely control devices in home-network through the variety of suggested mechanism, with security mechanism to be available for future home networking model, and verified the performance of our model.

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Performance Analysis of Ionospheric Time Delay for Single-Frequency GPS Users (단일 주파수 GPS 사용자에서의 전리층 전파특성 분석)

  • 박성경;강창언
    • The Proceeding of the Korean Institute of Electromagnetic Engineering and Science
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    • v.5 no.1
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    • pp.40-50
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    • 1994
  • Through the low orbit GPS satellite a 3-dimensional real time position detection can be achieved anywhere. Utilizing the GPS satellite detection values an analysis of the varing characteristics of the iono- sphere can be achicved, and by calculating the correlation relationship of the position detection error and the ionospheric time delay characteristics, an advanced algorithm technique can be developed. Computer simulation of the developed algorithm for defining the correlation between the position detec- tion error and the varing ionospheric time delay characteristics has been proceeded. The results of simulation reveal the fact that the varing characteristics of the ionosphere nearly match the actual ionospheric time delay characteristics.

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Stress Analysis of Finite Multi-layered Soils (유한다층토지반의 응력해석(1))

  • 박병기;장용채
    • Geotechnical Engineering
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    • v.6 no.4
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    • pp.19-32
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    • 1990
  • Generally foundation is composed of complicated multi - layers. Primary objective of this study is to perform numerical analysis on the distribution of stresses on the subgrade with the variation of constitutive equations, the structures and the depth of layer, rigidity, loading condition, etc. Multi - layered soils has been treated as Burmister's elastic model. However, in this research it was intended to analyzed the distribution of stresses on the subgrade with all of the multi - layered soils by using the EVP(elasto - viscoplastic) model, one of the numerical program based on the Biot's equation as governing equation. The numerical results are compared with those by the Burmister's and the Fox'method, which in turn proves to be satisfactory. This research is aiming at investigating the mechanism of stress transfer within a foundation by using computer program for multilayers foundation.

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Surface Runoff Friction Factor and Time of Concentration (지표면 유출 마찰계수와 도달시간)

  • Yoo, Dong-Hoon;Lee, Min-Ho;Lee, Tae-Hee
    • Proceedings of the Korea Water Resources Association Conference
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    • 2009.05a
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    • pp.1057-1062
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    • 2009
  • 대부분의 홍수 예측모형은 도달시간 산정에 있어 지표면 흐름을 중력흐름으로 가정한다. 그러나 Woo & Brater(1961)의 실험결과 지표면 흐름의 마찰계수는 바닥정사의 함수인 것으로 나타나며 수심이 매우 얕은 흐름의 경우 조고뿐만 아니라 바닥경사에 의한 영향이 매우 큰 것으로 나타났다. 새로운 무차원수 Y는 바닥경사, 수심, 조고 및 표면장력 등을 고려하는 인자로서 중력흐름과 표면장력흐름의 각 흐름특성을 반영하기 위한 새로운 도달시간 산정식을 개발하였다. 새로운 무차원수 Y는 표면장력과 관계된 후르드수 및 웨버수의 조합으로 조고뿐만 아니라 바닥경사, 수심의 함수로 나타난다. 지표면 흐름의 마찰계수 산정시 비례상수 ${\alpha}$를 새로운 무차원수 Y의 함수로 취하여 Butler(1977)의 실험자료를 분석하였다. 중력흐름의 경우 조고만의 함수로 나타나지만 표면장력흐름은 조고뿐만 아니라 바닥경사의 영향이 매우 중요한 것으로 나타났다. 중력흐름만을 고려하여 도달시간 산정시 관측치보다 작게 산정되는 반면 표면장력흐름으로 고려하여 도달시간 산정시 관측치와 근접하게 산정되었다. 따라서 지표면 유출 흐름은 중력과 함계 표면장력의 영향이 크게 작용하는 것으로 판단된다. 분석결과와 같이 표면장력흐름 특성을 고려한 도달시간 산정식을 모형에 적용할 경우 유출모형을 통한 유출량산정의 정확도 향상에 기여할 것으로 판단된다.

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A Single line diagram automation create development for efficiency observation in Distribution Automation System (배전 자동화 시스템에서 효율적인 감시를 위한 회선별 단선도 자동 생성 알고리즘 개발)

  • Kim, Young-In;Choi, Myeon-Song;Lee, Seung-Jae;Lim, Sung-Il;Kim, Pil-Suk
    • Proceedings of the KIEE Conference
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    • 2008.11a
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    • pp.238-240
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    • 2008
  • 현재의 배전자동화 시스템에서는 빠르게 계통의 변화를 이해하고 변화에 대한 대응을 할 수 있도록 전압 손실계산, 공급예비력 확보, 부하융통 방안수립 등을 주 업무로 하는 회선별 단선도를 가지고 있다. 또한 부하밀집 지역 같은 경우는 다수의 설비 symbol이 매우 근접하게 배치되어 있지만 단선도를 통해 계통을 단순화시켜 계통의 연결 관계를 쉽게 파악하고 운영한다. 하지만 도시가 점점 발전함에 따라 배 전자동화 시스템의 단선도 화면에 symbol이 많아져 계통이 크고 복잡해 졌을때 단선도가 화면을 넘어가는 현상과 선로의 중복 현상이 나타난다. 본 논문에서 제안하는 배 전자동화 시스템의 회선별 단선도 자동 생성 알고리즘은 계통이 크고 복잡해 져도 autodrawing기법을 통해 한 화면에 모두 보여 주고, 중복 현상을 없애기 위한 선로의 구성과 중복 현상 발생 때에도 좌표를 재배치 하는 알고리즘을 제안한다. 알고리즘을 통해 해결하며 또한 제안한 알고리즘을 검증하기 위해 VC++6.0을 기반으로 구현하였고, 이를 배전 자동화 시스템의 데이터베이스를 이용한 단선도와 비교를 통해 검증하였다.

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Evaluation and Competition Strategy for Korean Industry Clusters (한국 산업단지별 클러스터 평가 및 경쟁전략 수립)

  • Ku, Sang-Wuk
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.12 no.8
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    • pp.3446-3451
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    • 2011
  • Nowadays, industry clusters have been considered as critical factors for regional competitiveness and economic revitalization. It should be important to evaluate strategic positioning and establish competition strategies for Korean industry clusters. I proposed strategic positioning, identified problems, and established strategic directions by analyzing potential attractiveness based on growth and productivity and retained capabilities of proximity, networks, correlation and revenue increase for 7 regional industry clusters. In addition, I analyzed best practices of global industry clusters to provide implications on establishing competition strategies.