• Title/Summary/Keyword: latitude and longitude

검색결과 338건 처리시간 0.032초

Hot Spot Detection of Thermal Infrared Image of Photovoltaic Power Station Based on Multi-Task Fusion

  • Xu Han;Xianhao Wang;Chong Chen;Gong Li;Changhao Piao
    • Journal of Information Processing Systems
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    • 제19권6호
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    • pp.791-802
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    • 2023
  • The manual inspection of photovoltaic (PV) panels to meet the requirements of inspection work for large-scale PV power plants is challenging. We present a hot spot detection and positioning method to detect hot spots in batches and locate their latitudes and longitudes. First, a network based on the YOLOv3 architecture was utilized to identify hot spots. The innovation is to modify the RU_1 unit in the YOLOv3 model for hot spot detection in the far field of view and add a neural network residual unit for fusion. In addition, because of the misidentification problem in the infrared images of the solar PV panels, the DeepLab v3+ model was adopted to segment the PV panels to filter out the misidentification caused by bright spots on the ground. Finally, the latitude and longitude of the hot spot are calculated according to the geometric positioning method utilizing known information such as the drone's yaw angle, shooting height, and lens field-of-view. The experimental results indicate that the hot spot recognition rate accuracy is above 98%. When keeping the drone 25 m off the ground, the hot spot positioning error is at the decimeter level.

Power Sharing and Cost Optimization of Hybrid Renewable Energy System for Academic Research Building

  • Singh, Anand;Baredar, Prashant
    • Journal of Electrical Engineering and Technology
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    • 제12권4호
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    • pp.1511-1518
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    • 2017
  • Renewable energy hybrid systems look into the process of choosing the finest arrangement of components and their sizing with suitable operation approach to deliver effective, consistent and cost effective energy source. This paper presents hybrid renewable energy system (HRES) solar photovoltaic, downdraft biomass gasifier, and fuel cell based generation system. HRES electrical power to supply the electrical load demand of academic research building sited in $23^{\circ}12^{\prime}N$ latitude and $77^{\circ}24^{\prime}E$ longitude, India. Fuzzy logic programming discover the most effective capital and replacement value on components of HRES. The cause regarding fuzzy logic rule usage on HOMER pro (Hybrid optimization model for multiple energy resources) software program finds the optimum performance of HRES. HRES is designed as well as simulated to average energy demand 56.52 kWh/day with a peak energy demand 4.4 kW. The results shows the fuel cell and battery bank are the most significant modules of the HRES to meet load demand at late night and early morning hours. The total power generation of HRES is 23,794 kWh/year to the supply of the load demand is 20,631 kWh/year with 0% capacity shortage.

이동체용 직접위성방송 수신 안테나의 궤환 제어기 설계 (Design of the Feedback Controller of Direct Satellite Broadcasting Antenna for Vehicle)

  • 김기열;박종국
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2001년도 합동 추계학술대회 논문집 정보 및 제어부문
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    • pp.53-56
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    • 2001
  • In this paper we discuss a direct satellite broadcasting system for vehicle. The proposed satellite-steering algorithm and controller based on it are designed for a communication and broadcasting system which uses the Mugungwha satellite. The Mugungwha satellite that the proposed system should steer is a geostationary orbit device. The satellite-steering algorithm computes azimuth and elevation with reference to a stationary point on earth. This is extended to a real satellite steering algorithm that considers position and attitude. Real moving position and attitude are represented by latitude, longitude, roll, pitch and yaw. To apply these five pieces of information to the reference satellite steering algorithm, we introduce Euler's degree coordinates that express independently the rotation of each axis relative to an axis. There are two ways a basic algorithm of the antenna of a vehicle can track and orient to satellite. One way is a feedback loop method for broadcasting gain, while the other is a feedback loop method for position and attitude of a vehicle. In the present paper, we design a controller of satellite broadcasting system for a vehicle using an algorithm that combines the two methods. We performed a simulation and experiment to prove effectiveness.

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다양한 웨어러블 디바이스를 활용한 크로스컨트리스키 실시간 위치 추적: 사례 연구 (Real-time Location Tracking Analysis of Cross-country Skiing using Various Wearable Devices: A Case Study)

  • Hwang, Jinny;Kim, Jinhae;Kim, Hyeyoung;Moon, Jeheon;Lee, Jusung;Kim, Jinhyeok
    • 한국운동역학회지
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    • 제29권1호
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    • pp.1-8
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    • 2019
  • Objective: The purpose of this study was to confirm that the cross-country ski sprint course in PyeongChang, where the 2018 Winter Olympics course was to utilize wearable devices equipped with inertial measurement unit (IMU), global positioning system (GPS) and heart rates sensor. Method: For the data collection, two national level cross-country (XC) skiers performed classic technique on the entire sprint course. We analyzed cycle characteristics, range of motion on double poling (DP) technique, average velocity, and displacement of 3 points according to the terrain. Results: The absolute cycle time gradually decreased during starting, middle and finish sections. While the length of the DP increased and the heart rates tended to increase for men skier. In addition, the results indicated that range of motion of knee joint during starting and finish section decreased more than middle section. The errors of latitude and longitude data collected through GPS were within 3 m from 3 points. Conclusion: Through the first case study in Korea, which analyzed the location and condition of XC skiers in the entire sprint course in real time, confirmed that feedback was available in the field using various wearable sensors.

바이스태틱 레이더의 탐지 커버리지 분석 및 표적 위치 산출을 위한 M&S Tool (M&S Tool for Analysis of Detection Coverage and Target Localization in Bistatic Radar Systems)

  • 박중희;이원우;유진철;양훈기;정용식;배경빈
    • 한국군사과학기술학회지
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    • 제14권5호
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    • pp.904-912
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    • 2011
  • In this paper, we have proposed a M&S tool for analyzing detection coverage and target localization in bistatic radar system. The detection coverage determined by radar parameters is meaningful when it satisfies the clear line-of-sight condition. We improved the method to find the minimum altitudes of transmitter and receiver for meeting the condition by considering three-dimensional coverage. Its computational burden is not problematic because the calculation is for maximizing the performance of the radar and does not demand a real-time operation. In addition, target localization on three-dimensional earth model based on the information of the height, longitude, and latitude is proposed instead of the previous unpractical calculation on two-dimensional bistatic plane. Its precalculated result can reduce its computation burden and it is suitable for real-time estimation of target location.

단양지역에 분포하는 동고층에 대한 고지자기 연구 (A Paleomagnetic Study of the Tonggo Formation in Tanyang Area)

  • 도성재;박용희;김지연
    • 자원환경지질
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    • 제31권1호
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    • pp.45-52
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    • 1998
  • Paleomagnetic data have been obtained from the Lower Triassic Tonggo Formation which is exposed in Tanyang area comprising the Pyeongan Supergroup in eastern Korea. Mean characteristic direction of the Tonggo Formation is declination/inclination=$121.4^{\circ}/-26.4^{\circ}$ (k=52.7, ${\alpha}_{95}=7.2^{\circ}$, N=9 Sites) and paleopole at longitude/latitude=$30.7^{\circ}E/33.3^{\circ}N$ ($dp/dm=4.2^{\circ}/7.8^{\circ}$). The mean direction passes reversal test and fold test at 99% confidence level. Therefore, it is inferred to be a pre-folding component. The paleopole position of this study is close to the Triassic pole positions of the North China Block; it is far from those of the South China Block. Therefore, a first order correlation between the Korean Peninsula and North China at least since Lower Triassic times is identified in this study.

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DGPS를 이용한 선박 접안 시뮬레이션 시스템의 설계 (Design of simulation system using DGPS when the ship coming alongside the pier)

  • 최재석;모수종;정성훈;윤희철;임재홍
    • 한국항해항만학회:학술대회논문집
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    • 한국항해항만학회 2004년도 춘계학술대회 논문집
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    • pp.123-127
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    • 2004
  • 선박의 접안 시 현재 중ㆍ대형 선박은 체계화된 접안 시스템 없이 주선박의 선수와 선미 및 예인선에서 무전기를 이용한 통신에 의존하여 선박을 접안하고 있다. 본 논문에서는 이를 보완하고자 DGPS를 이용한 선반접안 시뮬레이tus 시스템을 설계하고자 한다. 주선박의 서버는 경ㆍ위도 좌표 값, 헤딩, 속도 등의 정보를 이용하여 선박과 부두와의 거리, 진행방향등을 구하고, 예인선과의 실시간 위치정보의 공유를 통한 정밀측정으로 안전하게 접안을 유도한다. 주 선박 및 예인선의 조타수는 PDA의 클라이언트 프로그램으로 실시간 전송되는 선박의 상태 및 각종 정보를 통해 진행상황을 알 수 있다. 또한, 시뮬레이션 프로그램으로 계산된 선박의 유도경로 데이터를 데이터베이스화하여 최적의 접안 경로를 제시함으로써, 기존의 접안환경보다 정밀한 상황 판단의 방법을 제시하였다.

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소련 위성 COSMOS 1402호의 낙하 추정 (ESTIMATION OF ORBITAL DECAY FOR THE SOVIET SATELLITE COSMOS 1402)

  • 이정숙;최규홍;김천휘
    • Journal of Astronomy and Space Sciences
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    • 제6권2호
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    • pp.101-108
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    • 1989
  • 1983년 초 세 부분-COSMOS 1402-A, B, C-으로 분리되어 추락한 소련 위성 COSMOS 1402호의 낙하를 추정하기 위한 알골이즘을 개발하였다. 이 인공위성의 궤도에 영향을 미치는 섭동력으로는 지구의 비대칭 중력포텐셜과 지구의 대기 저항에 의한 섭동력이 고려되었고, 고도에 따른 지구의 대기 밀도를 구하기 위해 표준대기모델을 만들었다. COSMOS 1402호의 낙하시 NASA GSFC가 보내온 궤도요소 자료를 이용하여 COSMOS 1402-A와 C의 낙하시각과 낙하지점을 추정하고, 미국무성의 발표와 비교해 보았다. COSMOS 1402-C의 경우 모두 잘 일치함을 보이나 COSMOS 1402-A 의 경우 낙하시각이 1분, 낙하지점은 경위도 각각 2도씩의 오차를 보였다.

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CIP법을 이용한 구 좌표계에서의 천수 방정식 해석 (NUMERICAL ANALYSIS FOR THE SHALLOW WATER EQUATIONS ON THE SPHERE BY CIP METHOD)

  • 윤성영;김수연;김현철
    • 한국전산유체공학회지
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    • 제10권2호
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    • pp.7-14
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    • 2005
  • In this study, the shallow water equations on the sphere is simulated by the proposed method which has high spatial resolution and is based on the CIP(Cubic Interpolated Pseudoparticle) method. The governing equations are approximated on the longitude-latitudinal coordinate system. To avoid the problems resulting from the convergence of the meridians toward high-latitude and singularities on the poles, the semi-Lagrangian and finite volume method are employed. in addition, the CIP method is employed to solve the advection equations and is extended to apply on the equations in the polar coordinate system. The mathematical formulation and numerical results are also described. To verify of the efficiency, accuracy and capability of proposed algorithm, the standard test cases proposed bv Williamson et. al are simulated and the results are compared with other results. As a result, it is found that the present scheme gives a good properties in preserving shapes of solution and settles the pole problems in solving the shallow water equations on the sphere.

Precise Geoid Model for Korea from Gravity and GPS Data

  • 최광선;;신영홍
    • 지구물리
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    • 제9권3호
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    • pp.181-188
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    • 2006
  • The data, methodology, and the resulting accurate gravimetric geoid model for the Korean Peninsula (latitude from 32˚ N to 40˚ N and longitude from 124˚ E to 131˚ E) are presented in this study. The types of used data were a high degree geopotential model (the EGM96 spherical harmonic coefficient set), a set of 12,615 land gravity observations, 1,056,075 shipborne gravity observations, and KMS2002 gravity anomalies from satellite altimetry. The remove-restore technique was successfully applied to combining the above mentioned data sets using up to degree and order 112 of the EGM96 coefficient. The residual geoid was calculated with residual Free-Air anomaly values using the spherical Stokes' formula with a 37-km integration cap radius. The geoid model was referred to WGS84 geodetic system and was tested using a set of GPS/levelling geoid undulations. The absolute accuracy is 0.132 m and some improvement compared to the PNU95 geoid model was found.

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