http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
- 中文 을 입력하시려면 zhongwen을 입력하시고 space를누르시면됩니다.
- 北京 을 입력하시려면 beijing을 입력하시고 space를 누르시면 됩니다.
RISS 인기검색어
- 검색키워드
- 주제어 : DSVM (검색결과 5 건)
- 무료
- 기관 내 무료
- 유료
-
드론을 이용한 홍수기 유량측정방법 개발(II) - 전자파표면유속계 적용
이태희,강종완,이기성,이신재 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.11
In the flood season, the measurement of the river discharge has many restrictions due to reasons such as budget, manpower, safety, convenience in measurement and so on. In particular, when heavy rain events occur due to typhoons, etc., it is difficult to measure the amount of flood due to the above problems. In order to improve this problem, in this study, a method was developed that can measure the river discharge in a flood season simply and safely in a short time with minimal manpower by combining the functions of a drone and a surface velocity doppler radar. To overcome the mechanical limitations of drones caused by weather issues such as wind and rainfall derived from the measurement of the river discharge using the conventional drone, we developed a drone with P56 grade dustproof and waterproof performance, stable flight capability at a wind speed of up to 36 km/h, and a payload weight of up to 10 kg. Further, to eliminate vibration which is the most important constraint factor in the measurement with a surface velocity doppler radar, a damper plate was developed as a device that combines a drone and a surface velocity Doppler radar. The velocity meter DSVM (Dron and Surface Veloctity Meter using doppler radar) that combines the flight equipment with the velocity meter was produced. The error of ±3.5% occurred as a result of measuring the river discharge using DSVM at the point of Geumsan-gun (Hwangpunggyo) located at Bonghwang stream (the first tributary stream of the Geum River). In addition, when calculating the mean velocity from the measured surface velocity, the measurement was performed using ADCP simultaneously to improve accuracy, and the mean velocity conversion factor (0.92) was calculated by comparing the mean velocity. In this study, the discharge measured by combining a drone and a surface velocity meter was compared with the discharge measured using ADCP and floats, so that the application and utility of DSVM was confirmed. 홍수기 하천에서 유량측정은 예산, 인력, 안전 및 측정 시 편의성 등의 이유로 측정에 제한이 많다. 특히, 태풍 등으로 인한 호우사상 발생 시 위와 같은 문제로 홍수량 측정에 어려움이 따른다. 이러한 문제점을 개선하기 위해 본 연구에서는 드론(Drone)과 전자파표면유속계(Surface velocity doppler radar)의 기능을 조합하여 최소 인력으로 짧은 시간에 간편하고, 안전하게 홍수기에 하천유량을 측정할 수 있는 방법을 개발하였다. 기존 드론을 이용한 유량측정 연구에서 도출된 바람, 강우 등 기상 요인에 의한 드론의 기계적인 한계를 극복하기 위해 본 연구에서는 IP56 등급의 방진·방수 성능, 최대 36 km/h의 풍속에서 안정적인 비행능력과 최대 10 kg을 탑재할 수 있는 드론을 개발하였다. 또한 전자파표면유속계 측정에 있어서 주요 제약 요소인 진동을 제거하기 위해 드론과 전자파표면유속계를 결합하는 댐퍼플레이트를 개발하였다. 이들 비행장비와 유속계를 결합시킨 유속계 DSVM (Dron and Surface Veloctity Meter using doppler radar)을 제작하였으며, 봉황천(금강 제1지류)에 위치한 금산군(황풍교)지점에서 DSVM을 운용하여 홍수량을 측정한 결과 ±3.5%의 오차가 발생하였다. 또한 측정된 표면유속으로부터 평균유속을 산정할 때 정확도 향상을 위해 ADCP를 이용하여 동시 측정하고, 평균유속을 비교하여 평균유속환산계수(0.92)를 산정하였다. 본 연구에서는 드론과 전자파표면유속계를 결합해 측정한 유량과 ADCP 및 봉부자를 이용해 측정한 유량을 비교하고, DSVM의 적용 및 활용 가능성을 확인하였다.
-
Current Sector Control for a Three-Phase Three-Level PFC Rectifier
O. Tubburee,Y. Kumsuwan 전력전자학회 2015 ICPE(ISPE)논문집 Vol.2015 No.6
In this paper, a control algorithm of a three-phase three-level power factor correction (PFC) rectifier, using a mathematical analysis of two-level space vector modulation (SVM), is presented. The proposed control scheme was developed, in order to generate the duty cycle signals for each switching device based on the discontinuous space vector modulation (DSVM) method. For this proposal it is not essential to determine the direction of line currents and sector of vectors, only to recognize the angle of the input reference voltage. Furthermore, the number of commutations of switches and switching losses are reduced due to the DSVM method. Simulation and calculation results can confirm the feasibility of the control algorithm and performance of the proposed rectifier.
-
-
Sakthi A,Rajaram M 보안공학연구지원센터 2016 International Journal of u- and e- Service, Scienc Vol.9 No.11
Cervical Cancer stands out among those deadliest diseases, which threatens women in an alarming rate causing approximately 2, 66,000 mortalities per annum worldwide. This cancer can be diagnosed early enough through Pap smear test; a cervical cancer screening program. Finding out the true positive rates of the Cervical Cancer cells with precision is more complex when identifying the same categories of the cancer disease. Various researchers have proposed many approaches over the past four decades and the solutions are pertinent to cervical cancer; however, the challenge remains partially unresolved. The significant contribution of this paper is in two folds, firstly discuss a cloud ready Adapter Driven Service Oriented Architecture (RESPRO 3.0), developed by us for automated screening of Pap Smear can be extended to any International Classification of Diseases (ICD). Secondly, present an Internet of Things (IoT) driven Cervical Cancer prediction adapter built for RESPRO 3.0 based on Density based Multiclass Support Vector Machines (MCSVM) in combination with Polynomial Kernel Trick. The density parameters provide unique space in identifying cervical cancer cell categories compared to exising researches. This cloud solution’s results are bench marked and verified against cyto technician’s ground truth results, found to be highly satisfactory with respect to 93% Sensitivity and 99% Specificity while minimizing test repeatability ratio for the supervised training set of images.
-
Experimental Verification for Active Power Filter based Four-Leg Inverter with SUI-PI Controller
El-sotouhy Mohamed M.,Mansour Ahmed A.,Marei Mostafa I.,Zaki Aziza M.,EL-Sattar Ahmed A. 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.5
Four-leg active power fi lter (4-LAPF) is considered one of the vital active fi lters that are frequently used in industrial applications, especially those that need to be controlled in each phase. In addition to control the neutral current that is created because of unbalanced and non-linear loads. In this paper, the active fi lter is controlled by a proposed control method that can achieve simplicity and intelligence at the same time. The novelty of this paper is simulation and experimental verifi cation for the proposed controller with 4-LAPF. This controller relies on instantaneous reactive power theory, which is used to create the reference currents for the 4-LAPF to inject into the network to mitigate problems associated with unbalanced and non-linear loads. As a result, the supply current is maintained a pure sinusoidal wave. The system is simulated using Matlab/Simulink and experimentally verifi ed. The simulation and experimental results prove the preference of the proposed controller over the conventional proportional-integration controller, where it reduces the total harmonic distortion of the supply current and enhance the power quality.
연관 검색어 추천
이 검색어로 많이 본 자료
활용도 높은 자료
