http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
센서 바이어스를 보상하는 칼만필터 기반의 예인 선배열 센서 형상 추정 기법
김근환,최수진,류창수,류영우,이균경,Kim, Geun Hwan,Choi, Su Jin,Ryu, Chang Soo,Ryu, Young Woo,Lee, Kyun Kyung 한국군사과학기술학회 2016 한국군사과학기술학회지 Vol.19 No.2
TASS(Towed Array Sonar System) is a sonar system which tows the sensor array behind a platform. Array shape is generally assumed to be a straight line. But the array shape is often distorted by oceanic current or platform maneuvering which causes the performance loss of signal processing method like beamforming. So array shape estimation methods are needed. Typically the method based on Kalman filter using heading sensor is used. In practice, the measurement is corrupted by biases which are caused by rotation of the tow cable, varying magnetic fields and slowly varying stresses in the mechanical construction. Although they can't be calibrated but can be estimated. In this paper, we suggest the array shape estimation method based on Kalman filter compensating the sensor biases.
몬테카를로 시뮬레이션을 활용한 건설공사 월간투입비용 예측방법
김근환(Kim, Geun-Hwan),유정호(Yu, Jung-Ho),김창덕(Kim, Chang-Duk) 대한건축학회 2012 大韓建築學會論文集 : 構造系 Vol.28 No.11
The importance of fundraising and forecasting the expenditure is emphasized for not only the decisive factor determining the success or failure of the project but also as an essential element of management stabilization. The monthly expenditure flow is used for financial analysis of the cash flow in construction site, financial costs, and intermediate payment, and the process control. But construction industry has a difficulty to forecast the monthly expenditure by reason of high liquidity of expenditure according to market situation, lack of professional experts, and short advance preparation at the first stage of the project. As there is no objective methodology, it is still dependent on the ability of the person in charge of the project. Due to the nature of construction industry which market fluctuates severely, forecasting cash flow and making provisions for change would be the necessary condition to enhance competitiveness and survive in harsh competition. In this sense, at the first stage of the project which there is less usable information, it is essential to forecast monthly expenditure using objective methodology. In this research, I would provide more objective and exact monthly expenditure forecast method, based on the information of completed record, using a fusible data regarding rough final costs at the first stage of the project and the entire construction period
드라이버 클럽 샤프트 강도(CPM)가 비거리와 방향성에 미치는 영향
김근환(Kim, Geun-Hwan),박성진(Park, Sung-Jin),박영진(Park, Young-Jin) 한국체육과학회 2016 한국체육과학회지 Vol.25 No.5
1) The results of testing 15 male pro gofers using the shaft flex ranging from 220CPM(the lowest) to 280CPM(the highest) showed that the difference in shaft flex does not have an effect on head speed, ball speed, trajectory, shot efficiency, amount of spin and directivity. 2) The results of testing 15 female pro gofers using the shaft flex ranging from 220CPM(the lowest) to 280CPM(the highest) showed that the difference in shaft flex does not have an effect on head speed, ball speed, trajectory, shot efficiency and the amount of spin, but has a significant effect on directivity(F=2.645, p=.020). 3) To analyze the difference between male and female pro golfers, the author tested 15 male pro gofers and 15 female pro golfers using the shaft flex ranging from 220CPM(the lowest) to 280CPM(the highest). As a result, male pro golfers showed significantly higher results than female pro golfers: head speed(t=28.783, p=.000), ball speed(t=27.966, p=.000), amount of spin(t=3.753, p=.000) and driving distance(t=26.481, p=.000). For trajectory. the ball trajectory of female golfers was significantly higher than male golfer, indicating statistically significant difference(t=-4.193, p=.000).
김근환(Geun Hwan Kim),류창수(Chang Soo Ryu),이균경(Kyun Kyung Lee) 대한전자공학회 2016 대한전자공학회 학술대회 Vol.2016 No.6
TASS(Towed Array Sonar System) is widely used sonar system and tows the long array sensor behind a platform. Array shape is assumed linear but sometimes it can be distorted and will generate performance degradation in beamforming. Generally heading sensors are deployed in array which used for array shape estimation. But it often fails. In this case, data based techniques like FDM(Field Directionality Mapping) can be used accessorily. FDM has disadvantage in computational complexity when it forms dense grid space to prevent performance degradation. In this paper, we suggest non-equispaced grid to prevent performance degradation with computational complexity.
석재공사의 하자예방을 위한 전문 컨설턴트의 단계별 참여방안에 관한 연구
김종필 ( Kim Jong-phil ),김근환 ( Kim Geun-hwan ),김창덕 ( Jang Kil-san ) 한국건축시공학회 2017 한국건축시공학회 학술발표대회 논문집 Vol.17 No.1
As the use of advanced quality materials in constructions has been increasing since 1980 with the improvements in the quality of life and economic scale, there has been drastic increase in constructions using stones for the internal and external construction materials. However, the reality is where many problems rise due to improper construction and management of uncertified stones which shorten the expiry date of the stones and act as the factor causing defects in buildings. Such defects not only bring economic losses but also influence consumer choice and act as risk factors to demand expansion of stone market. Therefore, the object of this study lies on proposing plans to prevent personal and economical losses due to repetitive defects by deriving the types of defects generated by process in stone constructions and identify the causes. Also, proposing construction process management plans as the measure for defect prevention, analyzing problems of stone constructions followed by the whole proves of design, construction and maintenance of stones, and solving such problems through appropriate participation of professional consultants depending on situations.