• 대한전자공학회논문지SP
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• 제39권2호
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• pp.69-78
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• 2002

본 논문에서는 복잡한 배경에서의 얼굴 추출 방법을 제안한다. 제안된 알고리즘은 적응 퍼지 색 분할기법을 사용하여 얼굴색과 머리색을 분할시킨다. 얼굴색 분포는 Y,Cb,Cr 색 공간내에서 유도되어지고, 조명값에 적응적인 퍼지 시스템을 사용하여 얼굴색을 구분해낸다. 머리색은 RGB 색 공간내에서 구분되어진다. 전처리 과정을 거쳐 추출되어진 얼굴색과 머리색 영역에 컨벡스 헐을 적용하여 그들의 관계를 통해 최종적인 얼굴 영역이 추출되어진다. 제안된 방법은 기존의 패턴 매칭 방법에 비해 효율적인 성능을 나타낸다. 제안된 알고리즘의 유효성을 실험을 통해 증명하며, 색 영역에서의 제한 조건 없이 성공적으로 얼굴 영역을 추출해 냄을 알 수 있다.

• 농촌지도와개발
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• 제18권3호
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• pp.351-384
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• 2011

The purpose of this study is to look at the case of the German compensation system for farmers' accidents and to build a basic scheme in our country's compensation system for farmers' accidents. When you view examples of Germany, the social insurance scheme for farmers accidents in korea should be design as an independent institution from the existing industrial accident insurance, and it comes to relationships with other social insurance system, preferably with complementary personalities. A general rule of the compensation system applies to all farmers in principle but the coverage limits part-time farmers. Financial burden consists of the mix of insurance premium and state aid. The type and level of benefits is similar to the current industrial accident insurance, which give priority to places on economic security for keeping farmworks, such as cost for using temporary farmers, rather than income loss. In terms of financial system, pay-as-you-go system would be better because of immediate payment with the introduction of the compensation system. The compensation system might be managed and administrated by the existing nationwide organization. Of course, for operating of system review and further research on the technical details such as premium issues and funding problems of government support, the exact classification of the target coverage, premiums based on estimated income for the farmers' estimation, the exact statistical data on the accumulation of agricultural disaster is needed.

• 한국지진공학회논문집
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• 제17권2호
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• pp.71-77
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• 2013

The uniform hazard spectra for seven major cities in Korea, Seoul, Daejeon, Daegu, Busan, Gwangju, Ulsan, and Inchon are suggested. Probabilistic seismic hazard analyses were performed using the attenuation equations derived from seismology research in Korea since 2000 and the seismotectonic models selected by expert assessment. For the estimation of the uniform hazard spectra, the seismic hazard curves for several frequencies and PGAs were calculated by using the spectral attenuation equations. The seismic hazards (annual exceedance probability) calculated for the 7 metropolises ranged from about $1.4305{\times}0^{-4}/yr$ to $1.7523{\times}10^{-4}/yr$ and averaged out at about $1.5902{\times}10^{-4}/yr$ with a log standard deviation of about 0.085 at 0.2 g. The uniform hazard spectra with recurrence intervals of 500, 1000, and 2500 years estimated by using the calculated mean seismic hazard on the frequencies presented peak values at 10.0 Hz, and the log standard deviations of the difference between metropolises ranged from about 0.013 to 0.209. In view of the insignificant difference between the estimated uniform hazard spectra obtained for the considered metropolises, the mean uniform hazard spectrum was estimated. This mean uniform hazard spectrum is expected to be used as input seismic response spectrum for rock sites in Korea.

• 말소리와 음성과학
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• 제3권1호
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• pp.145-151
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• 2011

In view of the hypothesis that the effects of Parkinson's disease on voice production can be detected before pharmacological intervention, the prosodic features of patients with idiopathic Parkinson's disease (IPD) and a healthy aging group were diagnostically analyzed with the long term object of establishing, for clinical purposes, early disease-progression biomarkers. Twenty patients (male 8; female 12) with IPD (prior to pharmacological intervention) and a healthy control group of 22 (male 10; female 12) were selected. Ten sentences were recorded with a head-worn microphone. One sentence was chosen for the analysis of this paper. Relevant parameters, i.e. 3-dimensional model (F0, intensity, duration) and pitch and intensity related slopes (maxEnergy, maxF0, meanAbS, semiT, meanEnergy, meanF0), were analyzed by two-group discriminant analysis. The stepwise estimation method of discriminant analysis was performed by gender. The discriminant functions predicted 83.9% of the male test data correctly while the prediction rate was 93.1% for the female group. The results showed that meanF0_slope and semiT_slope were more important parameters than the others for the male group. For the female group, the meanEnergy_slope and maxEnergy_slope were the important ones. These findings indicate that significant parameters are different for the male and female group. Gender lifestyle may be responsible for this difference. Dysprosodic features of IPD show not simultaneously but progressively in terms of F0, intensity and duration.

• 한국수자원학회:학술대회논문집
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• 한국수자원학회 2010년도 학술발표회
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• pp.1109-1113
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• 2010

창원시는 경제성장에 따른 도시화 현상으로 경작지나 녹지와 같은 투수지표면이 대단위 주택단지나 도로, 상업지구, 공장시설과 같은 불투수지표면으로 변화되어 전형적인 도시 유역특성을 띠고 있어 SWMM 모형의 적용에 적합하다. 적용대상인 남천은 창원시를 관류하는 유로연장 14.7 km의 하천으로 지류인 창원천을 포함하고 있으며, 2007년부터 환경부 지원 시범사업으로 생태하천복원사업이 계획되어 실시설계 완료 후 공사가 진행 중이나, 복원 후 하천관리를 위한 유지유량 산정 등의 타당성과 관련한 문제가 지역사회에서의 화두로 대두되고 있다. 따라서 본 연구에서는 남천 유역의 특성을 적절히 고려한 유지유량 산정을 통해 향후 복원된 남천의 하천관리기준을 제시하고자 하였다. 본 연구에서는 2008년 실측된 남천과 창원천의 유량자료와 SWMM 유출량 모의결과를 비교, 분석하였다. 남천의 유량자료는 2008년 5월 6일부터 8월 20일까지 실측하였으며, 남천의 지류인 창원천은 유량자료 취득구간이었던 창원천교 지점에서 생태하천복원사업이 진행됨에 따라 유량자료를 취득할 수 없었으므로 남천의 유량자료를 이용하여 비유량법으로 추정하였다. 유출량 산정을 위한 강우자료는 기상청 자료를 사용하는 것이 일반적이나 마산과 창원의 강우자료를 이용한 분석 결과 강우 패턴에 차이가 있음을 발견하고 마산기상대의 자료 대신, 창원시에서 제공한 5년간 (2005년~2009년)의 자료를 사용하였다. SWAT을 이용하여 남천 유역을 39개의 소유역으로 분할하고 Arc View를 이용하여 지형인자들을 추출하여 SWMM 입력자료로 사용하였다. 입력자료 중 유출량 추정에 큰 영향을 끼치는 매개변수들은 민감도 분석을 통하여 최적의 매개변수들을 결정하고 연유출량 추정을 위한 모의를 수행하였다. 이상의 과정을 통하여 남천의 연유출량을 추정함으로써 하천관리를 위한 유지유량 산정의 기초로 활용할 수 있었다.

• 한국측량학회지
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• 제36권4호
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• pp.245-254
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• 2018

본 논문에서는 GPS 높이측량의 정확도 제고 측면에서 대류권오차 보정방법이 기선해석을 통한 타원체고 추정 정확도와 정밀도에 미치는 영향을 실험적 방법에 의해 연구하였다. 이를 위해 국내 상시관측소 88점을 이용해 기선장과 표고차에 따라 247개 기선을 구성하고, GNSS 통합 데이터센터로부터 7일 분량의 관측 데이터를 취득한 후 2가지 기선해석 소프트웨어에 의해 Hopfield, 수정 Hopfield 그리고 Saastamoinen와 같은 경험식과 이중차분 및 정밀절대측위 대류권 오차 추정기법을 적용해 총 8,645개 실험기선을 처리하였다. 산정한 각 관측점 타원체고의 정확도와 정밀도를 오차 보정기법 따라 계산하고 기선장과 표고차와 같은 기선 구성 조건에 대해 분석하였다. 이를 통해 대류권오차 보정방식의 특징을 정확도와 정밀도 측면에서 고찰하고 GPS 높이측량의 기선해석에서 기선장과 표고차에 대해 적합한 대류권오차 모형화 기법선정을 위한 기초자료를 제공하고자 하였다.

• 한국게임학회 논문지
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• 제7권4호
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• pp.63-70
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• 2007

넓은 시야각을 갖는 전방향(omnidirectional) 카메라 시스템은 적은 수의 영상으로도 주변 장면에 대해 많은 정보를 취득할 수 있는 장점으로 감시, 3차원 해석 등의 분야에 널리 응용되고 있다. 본 논문에서는 어안(fisheye) 렌즈를 이용한 전방향 카메라로 입력된 영상으로부터 카메라의 이동 및 회전 파라미터를 자동으로 추정하는 새로운 자동보정 알고리즘이 제안되었다. 먼저, 카메라 위치를 임의의 각 도로 변환하여 얻어진 영상을 이용해 일차 매개변수로 표현된 카메라의 사영(projection)모델을 추정한다. 그리고 이후 다양하게 변환되는 카메라의 위치에 따라 에센셜(essential) 행렬을 구하며, 이 과정에서 대상 영상으로부터 적합한 인라이어(inlier) 집합을 구하기 위해 특징점이 영역 내에 분포 정도를 반영하는 표준편차(standard deviation)를 정량적(quantitative) 기준으로 이용한다. 다양한 실험을 통해 제안된 알고리즘이 전방향 카메라의 사영 모델과 회전, 이동 등의 변환 파라미터를 정확하게 추정함을 확인하였다.

• 한국해양공학회지
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• 제26권2호
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• pp.48-57
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• 2012

This paper deals with numerical analyses in the context of estimations of hydrodynamic motions and dynamic loads for a floating type offshore platform using some exclusive simulation code such as code for the simulation of a floating type of offshore crane based on multi-body dynamics, along with the commercial code AQWA. Verifications of numerical models are carried out by comparing the RAO results from the simulation code. In the verification analyses, hydrodynamic motions are examined in the frequency domain for the floating type offshore platform according to the mooring lines. Both the hydrodynamic motions and dynamic loads are estimated for floating type offshore platforms equipped with the catenary type and taut mooring lines. A review and comparison are carried out for the numerically estimated results. The structural safety of the connection parts in an offshore structure such as a floating type offshore platform is one of the most important design criteria in view of fatigue life. The dynamic loads in the connecting area between a floating type offshore platform and its mooring lines are estimated in detail according to variations in the mechanical properties of the mooring lines. The dynamic tension load on the mooring lines is also estimated.

• 한국조경학회지
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• 제29권1호
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• pp.22-31
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• 2001

The purpose of this study is to compare calculated pollutant loadings using pollutant load unit factors and vector type coverage, and expected mean concentration(EMC) and raster type of digital elevation model(DEM). This study is also focusing on comparison of the advantages and the disadvantages of the two methods, and seeking for a method of calculation of pollutant loadings using DEM. Estimation of pollutant inputs using pollutant load unit factors has limitations in identifying seasonal variations of pollutant loadings. Seasonal changes of runoffs should be considered in the calculation of pollutant loadings from catchments into reservoirs. Evaluation of pollutant inputs using runoff-coefficient and EMC can overcome these drawbacks. Proper EMC and runoff-coefficient values for the Koeup stream catchments of the Koheung estuarine lake were drawn from review of related papers. Arc/Info was employed to establish database of spatial and attribute data of point and non-point pollutant sources and characteristics of the catchments. ArcView was used to calculate point and non-point pollutant loadings. Pollutant loads estimated with either unit factors-coverages, i.e., pollutant load unit factors and vector coverages f point sources and land use, or EMC and digital elevation mode(DEM) were compared with stream monitoring loads. We have found that some differences were shown between monitoring results and estimated loads by Unit Factors-Coverage and EMC-DEM. Monthly variations of pollutant loads evaluated with EMC-DEM were similar to those with monitoring result. The method using EMC-DEM can calculate accumulated flows and pollutant loads and can be utilized to identify stream networks. A future research on correcting the difference between vector type stream using flow direction grid and digitalizing vector type should be conducted in order to obtain more exact calculation of pollutant loadings.

• 환경영향평가
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• 제21권1호
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• pp.93-104
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• 2012

In this research LCA methodology was adapted and analyzed in quantifying estimation of estuarine environment. The analysed objects of estuarine environment were construction methods, facility, and input material into water, and estuarine ecosystem. In this research the function of LCA of estuarine environment was river with the view of controling water, utilizing water, and hydrophilic function. According to the result of research, environmental damage indicator of facility was decreased 346 Pt from 453 Pt at pre-maintenance to 107 pt at post-maintenance. Among raw and subsidiary materials, remicon, stone-netting bag, and pebbles were showing heavy environmental load in the order. Evironmental impact of input material into water system was analyzed from 1,827 Pt environmental load before construction to 1,080 Pt of post-maintenance, and damage indicator was improved at 747 Pt. Water quality was improved from 1,827 Pt (before construction) to 1,080 Pt(after construction), and ecosystem was improved after maintenance. Environmental indicator in ecosystem was analyzed 427 Pt(before construction) to 348 Pt(after construction), and damage indicator of Sumnjingang riverine system was improved as much as 79 Pt. In the conclusion, estuarine environmental monitoring through LCA in the area of facility, input material into water and ecosystem showed that close-to-nature stream was 1,172 Pt better than artificial stream in environmental aspects.