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불확정 표적 모델에 대한 순환 신경망 기반 칼만 필터 설계
김동범,정대교,임재혁,민사원,문준 한국군사과학기술학회 2023 한국군사과학기술학회지 Vol.26 No.1
For various target tracking applications, it is well known that the Kalman filter is the optimal estimator(in the minimum mean-square sense) to predict and estimate the state(position and/or velocity) of linear dynamical systems driven by Gaussian stochastic noise. In the case of nonlinear systems, Extended Kalman filter(EKF) and/or Unscented Kalman filter(UKF) are widely used, which can be viewed as approximations of the(linear) Kalman filter in the sense of the conditional expectation. However, to implement EKF and UKF, the exact dynamical model information and the statistical information of noise are still required. In this paper, we propose the recurrent neural-network based Kalman filter, where its Kalman gain is obtained via the proposed GRU-LSTM based neural-network framework that does not need the precise model information as well as the noise covariance information. By the proposed neural-network based Kalman filter, the state estimation performance is enhanced in terms of the tracking error, which is verified through various linear and nonlinear tracking problems with incomplete model and statistical covariance information.
드라이브 스루의 서비스 품질이 만족과 행동의도에 미치는 영향:패스트 푸드점을 중심으로
김동범 (사)한국조리학회 2020 한국조리학회지 Vol.26 No.10
The purpose of this study is to investigate the effect of service quality (physical environment quality, interaction quality, outcome quality) on satisfaction and behavioral intention for consumers using drive- thru services. Data was collected from consumers who have used the drive-thru service of fast food restaurants (McDonald’s, Burger king, Lotteria, Kfc) within the last three months. The survey period was from August 1, 2020 to August 20, and a total of 257 questionnaires were collected through online research company. Data analysis was performed using SPSS 22.0 and AMOS 22.0 for demographic analysis, descriptive statistics analysis, reliability analysis, confirmatory factor analysis, correlation matrix analysis and structural equation modeling. The results of this study are as follows. First, the physical environmental quality had a positive (+) effect on satisfaction. Second, interaction quality had a positive (+) effect on satisfaction. Third, outcome quality had a positive (+) effect on satisfaction. Fourth, satisfaction had a positive (+) effect on behavioral intention. Through this study, the service quality, satisfaction, and behavioral intentions of consumers who have used the drive-thru service of fast food restaurants are presented from multiple perspectives. Also implications and limitations through the results of this study were mentioned.
김동범,추연근,조해용,Kim, Dongbum,Qiu, Yuangen,Cho, Hae-Yong 대한용접접합학회 2015 대한용접·접합학회지 Vol.33 No.3
Self-piercing riveting is an joining method of advanced high strength steels (AHSS) and other dissimilar materials. It has attracted considerable interest from the automotive industry. The SPR has become an interesting alternative joining technique for difficult to weld materials such as steels and aluminium alloys. In this paper, self-piercing rivet and anvil for SPR were designed for the joining conditions with AHSS and aluminium alloy. Various conditions of SPR were simulated for the design of rivets and anvils. The simulated results were in good agreement with experimental ones. As a result, over HV500 rivet is desirable to joint SPFC780 AHSS and aluminum alloy.
키오스크의 지각된 편리성과 기술수용의 어려움이 지각된 가치와 행동의도에 미치는 영향: 개인 혁신성의 조절효과를 중심으로
김동범,남궁영 (사)한국조리학회 2019 한국조리학회지 Vol.25 No.5
The purpose of this study was to identify the effect of fast food consumers’ perceived convenience and technical difficulties toward self-service kiosk on perceived value and behavioral intention. Data were collected from consumers who visited the fast food restaurants within the last three months. A total of 419 valid questionnaires were collected. Data analysis was conducted using frequency analysis, reliability analysis, factor analysis, simple regression analysis, multiple regression analysis, and moderating effect analysis using SPSS 22.0. The results of this paper were as follows. First, perceived convenience had a positive(+) impact on perceived value. Second, technical difficulties had a negative(-) impact on perceived value. Third, perceived value had a positive(+) impact behavioral intention. Forth, personal innovativeness had a moderating effect between perceived convenience and perceived value. In this study, the consumers who use the kiosk are analyzed through empirical analysis to present various conclusions. More specific managerial implications and limitations were discussed as well in this study.