• Proceedings of the Korea Information Processing Society Conference
• /
• 2023.05a
• /
• pp.555-557
• /
• 2023

해양의 영향을 많이 받는 우리나라의 지리적 특성상 해양 상황은 산업 및 생업과 밀접한 관계가 있다. OPEN API 를 이용하여 유향/유속, 조위등 해양 환경관련 실시간 시계열 데이터를 수집한 후 2 차원 공간에 표시하여 순환 신경망 모델을 이용하여 학습한다. 학습된 모델을 실제 데이터에 적용하여 파랑을 예측한다. 시계열의 성격이 있고 공간상에 표시할 수 있는 데이터라면 본 논문에서 제시한 체계를 통해 예측할 수 있을 것이라 예상한다.

• 한국지구과학회:학술대회논문집
• /
• 2005.09a
• /
• pp.144-148
• /
• 2005

• Ceramist
• /
• v.14 no.3
• /
• pp.7-16
• /
• 2011

• Journal of Scientific & Technological Knowledge Infrastructure
• /
• s.11
• /
• pp.14-27
• /
• 2002

이 연구는 북한 IT부문에 대한 객관적이고 충실한 정보가 절대적으로 부족한 상황에서 북한의 IT현황은 어떠한지, 김정일의 IT산업정책의 주요 내용은 무엇인지, 이러한 IT산업정책의 배경과 목적은 무엇인지에 대해 분석하는 것을 목적으로 한다.

• 한국보건간호학회:학술대회논문집
• /
• 1996.11a
• /
• pp.101-102
• /
• 1996

• The Journal of Engineering Geology
• /
• v.16 no.3 s.49
• /
• pp.293-300
• /
• 2006

The groundwater movement in the west costal landfill area was analyzed by measuring N value by Standard Penetration Test, coefficient of permeability by falling head method, linear structure analysis by Digital Elevation Method, groundwater flow direction and rate by flowmeter logging due to tidal variation in the each borehole. The coefficients of permeability of the weathered zone and of the marine deposit showed similar values although some values of weathered zone show smaller values than those of the marine deposit. The major groundwater flow and rate in the marine deposit observed as east-west direction due to tidal variation, but on the other hand it was observed as N45E in weathered zone which is the major direction of the linear structures in the area. 2 hours delayed changes of the groundwater flow direction was observed during the 24 hours observation, and it seems to be a travel time of the tidal wave which cause the continuous change of the hydaulic gradient of the groundwater.

• The Journal of Engineering Geology
• /
• v.17 no.3
• /
• pp.367-379
• /
• 2007

This study intended to evaluate hydrogeological characteristics in relation to subsurface geology data obtained from borehole, groundwater level, borehole flowmeter test, and field hydraulic tests. The regression equation of groundwater level (Y) versus ground elevation (X) is expressed by Y=0.75X-7.00 with quite high correlation coefficient of 0.78. Relationship between groundwater level and thickness of landfill, alluvium, and weathered zone results in higher correlation of groundwater level (Y) versus natural log value of weathered tone (A) than other correlations, with the regression equation Y= exp(9.974A)-14.155. The result of groundwater flow measurement in the boreholes indicates that groundwater flows towards between south and southwest, and this approximately agree with regional distribution of groundwater levels.

• The Journal of Engineering Geology
• /
• v.9 no.2
• /
• pp.147-159
• /
• 1999

Geostatistical methods were used for the groundwater flow analysis in a heterogeneous anisotropic aquifer. This study area is located at Sonbul-myeon in Hampyong-gun of Cheonnam Province which is a hydrogeological project area of KORES(Korea Resources Cooperation). Linear regression analysis shows that the topographic elevation and groundwater level of this area have very high correlation. Groundwater-level contour maps produced by ordinary kriging and cokringing have large differences in mountain areas, but small differences in hill and plain areas near the West Sea. Comparing two maps on the basis of an elevation contour map, a groundwater-level contour map using cokriging is more accurate. Analyzing the groundwater flow on two groundwater-level contour maps, the groundwater of study area flows from the high mountain areas to the plain areas near the West Sea. To verify the enffectiveness of geostatistical methods for the groundwater flow analysis in a heterogeneous anisotropic aquifer, the flow directions of groundwater were measured at two groundwater boreholes by a groundwater flowmeter system(model 200 $GeoFlo^{R}$). The measured flow directions of groundwater almost accord with those estimated on two groundwater-level contour maps produced by geostatistical methods.

• Journal of Korea Water Resources Association
• /
• v.55 no.spc1
• /
• pp.1211-1222
• /
• 2022

Abnormal condition inevitably occurs during operation of water distribution system (WDS) and requires the isolation of certain areas using isolation valves. In general, the determination of the optimal location of isolation valves considered minimization of hydraulic failures as isolation of certain areas causes a change in hydraulic states (e.g., flow direction, velocity, pressure, etc.). Water quality failure can also be induced by changes in hydraulics, which have not been considered for isolation valve system design. Therefore, this study proposes a new isolation valve system design methodology to prevent unexpected water quality failure events. The new methodology considers flow direction change ratio (FDCR), which accounts for flow direction changes after isolation of the area, as a constraint while reliability is used as the objective function. The optimal design model has been applied to a synthetic grid network and the results are compared with the traditional design approach. Results show that considering FDCR can eliminate flow direction changes while average pressure and coefficient of variation of pressure, velocity, and hydraulic geodesic index (HGI) outperform compared to the traditional design approach. The proposed methodology is expected to be a useful approach to minimizing unexpected consequences by traditional design approaches.

• 전기의세계
• /
• v.14 no.4
• /
• pp.28-35
• /
• 1965

Kirchhoff는 유향성 선형 graph에 포함되어 있는 입상기하학적인 특성, 즉 주어진graph의 모든 정점과 변들의 연결상태를 0, +1, -1의 세가지 수자로 된 소위 incidence행렬란 개념으로 집약시켰다. 본 고에서는 Incidence Matrix, Tie-set Matrix과 연결지 전류(link current), Cut-set Matrix과 절점대 전압(Node pair voltage), Tie-set및 cut-set행렬의 선형변환, Duality(쌍대성)